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1/*
2 * $Id: synclink.c,v 4.38 2005/11/07 16:30:34 paulkf Exp $
3 *
4 * Device driver for Microgate SyncLink ISA and PCI
5 * high speed multiprotocol serial adapters.
6 *
7 * written by Paul Fulghum for Microgate Corporation
8 * paulkf@microgate.com
9 *
10 * Microgate and SyncLink are trademarks of Microgate Corporation
11 *
12 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
13 *
14 * Original release 01/11/99
15 *
16 * This code is released under the GNU General Public License (GPL)
17 *
18 * This driver is primarily intended for use in synchronous
19 * HDLC mode. Asynchronous mode is also provided.
20 *
21 * When operating in synchronous mode, each call to mgsl_write()
22 * contains exactly one complete HDLC frame. Calling mgsl_put_char
23 * will start assembling an HDLC frame that will not be sent until
24 * mgsl_flush_chars or mgsl_write is called.
25 *
26 * Synchronous receive data is reported as complete frames. To accomplish
27 * this, the TTY flip buffer is bypassed (too small to hold largest
28 * frame and may fragment frames) and the line discipline
29 * receive entry point is called directly.
30 *
31 * This driver has been tested with a slightly modified ppp.c driver
32 * for synchronous PPP.
33 *
34 * 2000/02/16
35 * Added interface for syncppp.c driver (an alternate synchronous PPP
36 * implementation that also supports Cisco HDLC). Each device instance
37 * registers as a tty device AND a network device (if dosyncppp option
38 * is set for the device). The functionality is determined by which
39 * device interface is opened.
40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
45 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
46 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
47 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 */
53
54#if defined(__i386__)
55# define BREAKPOINT() asm(" int $3");
56#else
57# define BREAKPOINT() { }
58#endif
59
60#define MAX_ISA_DEVICES 10
61#define MAX_PCI_DEVICES 10
62#define MAX_TOTAL_DEVICES 20
63
64#include <linux/module.h>
65#include <linux/errno.h>
66#include <linux/signal.h>
67#include <linux/sched.h>
68#include <linux/timer.h>
69#include <linux/interrupt.h>
70#include <linux/pci.h>
71#include <linux/tty.h>
72#include <linux/tty_flip.h>
73#include <linux/serial.h>
74#include <linux/major.h>
75#include <linux/string.h>
76#include <linux/fcntl.h>
77#include <linux/ptrace.h>
78#include <linux/ioport.h>
79#include <linux/mm.h>
80#include <linux/seq_file.h>
81#include <linux/slab.h>
82#include <linux/delay.h>
83#include <linux/netdevice.h>
84#include <linux/vmalloc.h>
85#include <linux/init.h>
86#include <linux/ioctl.h>
87#include <linux/synclink.h>
88
89#include <asm/system.h>
90#include <asm/io.h>
91#include <asm/irq.h>
92#include <asm/dma.h>
93#include <linux/bitops.h>
94#include <asm/types.h>
95#include <linux/termios.h>
96#include <linux/workqueue.h>
97#include <linux/hdlc.h>
98#include <linux/dma-mapping.h>
99
100#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_MODULE))
101#define SYNCLINK_GENERIC_HDLC 1
102#else
103#define SYNCLINK_GENERIC_HDLC 0
104#endif
105
106#define GET_USER(error,value,addr) error = get_user(value,addr)
107#define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
108#define PUT_USER(error,value,addr) error = put_user(value,addr)
109#define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
110
111#include <asm/uaccess.h>
112
113#define RCLRVALUE 0xffff
114
115static MGSL_PARAMS default_params = {
116 MGSL_MODE_HDLC, /* unsigned long mode */
117 0, /* unsigned char loopback; */
118 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
119 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
120 0, /* unsigned long clock_speed; */
121 0xff, /* unsigned char addr_filter; */
122 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
123 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
124 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
125 9600, /* unsigned long data_rate; */
126 8, /* unsigned char data_bits; */
127 1, /* unsigned char stop_bits; */
128 ASYNC_PARITY_NONE /* unsigned char parity; */
129};
130
131#define SHARED_MEM_ADDRESS_SIZE 0x40000
132#define BUFFERLISTSIZE 4096
133#define DMABUFFERSIZE 4096
134#define MAXRXFRAMES 7
135
136typedef struct _DMABUFFERENTRY
137{
138 u32 phys_addr; /* 32-bit flat physical address of data buffer */
139 volatile u16 count; /* buffer size/data count */
140 volatile u16 status; /* Control/status field */
141 volatile u16 rcc; /* character count field */
142 u16 reserved; /* padding required by 16C32 */
143 u32 link; /* 32-bit flat link to next buffer entry */
144 char *virt_addr; /* virtual address of data buffer */
145 u32 phys_entry; /* physical address of this buffer entry */
146 dma_addr_t dma_addr;
147} DMABUFFERENTRY, *DMAPBUFFERENTRY;
148
149/* The queue of BH actions to be performed */
150
151#define BH_RECEIVE 1
152#define BH_TRANSMIT 2
153#define BH_STATUS 4
154
155#define IO_PIN_SHUTDOWN_LIMIT 100
156
157struct _input_signal_events {
158 int ri_up;
159 int ri_down;
160 int dsr_up;
161 int dsr_down;
162 int dcd_up;
163 int dcd_down;
164 int cts_up;
165 int cts_down;
166};
167
168/* transmit holding buffer definitions*/
169#define MAX_TX_HOLDING_BUFFERS 5
170struct tx_holding_buffer {
171 int buffer_size;
172 unsigned char * buffer;
173};
174
175
176/*
177 * Device instance data structure
178 */
179
180struct mgsl_struct {
181 int magic;
182 struct tty_port port;
183 int line;
184 int hw_version;
185
186 struct mgsl_icount icount;
187
188 int timeout;
189 int x_char; /* xon/xoff character */
190 u16 read_status_mask;
191 u16 ignore_status_mask;
192 unsigned char *xmit_buf;
193 int xmit_head;
194 int xmit_tail;
195 int xmit_cnt;
196
197 wait_queue_head_t status_event_wait_q;
198 wait_queue_head_t event_wait_q;
199 struct timer_list tx_timer; /* HDLC transmit timeout timer */
200 struct mgsl_struct *next_device; /* device list link */
201
202 spinlock_t irq_spinlock; /* spinlock for synchronizing with ISR */
203 struct work_struct task; /* task structure for scheduling bh */
204
205 u32 EventMask; /* event trigger mask */
206 u32 RecordedEvents; /* pending events */
207
208 u32 max_frame_size; /* as set by device config */
209
210 u32 pending_bh;
211
212 bool bh_running; /* Protection from multiple */
213 int isr_overflow;
214 bool bh_requested;
215
216 int dcd_chkcount; /* check counts to prevent */
217 int cts_chkcount; /* too many IRQs if a signal */
218 int dsr_chkcount; /* is floating */
219 int ri_chkcount;
220
221 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
222 u32 buffer_list_phys;
223 dma_addr_t buffer_list_dma_addr;
224
225 unsigned int rx_buffer_count; /* count of total allocated Rx buffers */
226 DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
227 unsigned int current_rx_buffer;
228
229 int num_tx_dma_buffers; /* number of tx dma frames required */
230 int tx_dma_buffers_used;
231 unsigned int tx_buffer_count; /* count of total allocated Tx buffers */
232 DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
233 int start_tx_dma_buffer; /* tx dma buffer to start tx dma operation */
234 int current_tx_buffer; /* next tx dma buffer to be loaded */
235
236 unsigned char *intermediate_rxbuffer;
237
238 int num_tx_holding_buffers; /* number of tx holding buffer allocated */
239 int get_tx_holding_index; /* next tx holding buffer for adapter to load */
240 int put_tx_holding_index; /* next tx holding buffer to store user request */
241 int tx_holding_count; /* number of tx holding buffers waiting */
242 struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
243
244 bool rx_enabled;
245 bool rx_overflow;
246 bool rx_rcc_underrun;
247
248 bool tx_enabled;
249 bool tx_active;
250 u32 idle_mode;
251
252 u16 cmr_value;
253 u16 tcsr_value;
254
255 char device_name[25]; /* device instance name */
256
257 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
258 unsigned char bus; /* expansion bus number (zero based) */
259 unsigned char function; /* PCI device number */
260
261 unsigned int io_base; /* base I/O address of adapter */
262 unsigned int io_addr_size; /* size of the I/O address range */
263 bool io_addr_requested; /* true if I/O address requested */
264
265 unsigned int irq_level; /* interrupt level */
266 unsigned long irq_flags;
267 bool irq_requested; /* true if IRQ requested */
268
269 unsigned int dma_level; /* DMA channel */
270 bool dma_requested; /* true if dma channel requested */
271
272 u16 mbre_bit;
273 u16 loopback_bits;
274 u16 usc_idle_mode;
275
276 MGSL_PARAMS params; /* communications parameters */
277
278 unsigned char serial_signals; /* current serial signal states */
279
280 bool irq_occurred; /* for diagnostics use */
281 unsigned int init_error; /* Initialization startup error (DIAGS) */
282 int fDiagnosticsmode; /* Driver in Diagnostic mode? (DIAGS) */
283
284 u32 last_mem_alloc;
285 unsigned char* memory_base; /* shared memory address (PCI only) */
286 u32 phys_memory_base;
287 bool shared_mem_requested;
288
289 unsigned char* lcr_base; /* local config registers (PCI only) */
290 u32 phys_lcr_base;
291 u32 lcr_offset;
292 bool lcr_mem_requested;
293
294 u32 misc_ctrl_value;
295 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
296 char char_buf[MAX_ASYNC_BUFFER_SIZE];
297 bool drop_rts_on_tx_done;
298
299 bool loopmode_insert_requested;
300 bool loopmode_send_done_requested;
301
302 struct _input_signal_events input_signal_events;
303
304 /* generic HDLC device parts */
305 int netcount;
306 spinlock_t netlock;
307
308#if SYNCLINK_GENERIC_HDLC
309 struct net_device *netdev;
310#endif
311};
312
313#define MGSL_MAGIC 0x5401
314
315/*
316 * The size of the serial xmit buffer is 1 page, or 4096 bytes
317 */
318#ifndef SERIAL_XMIT_SIZE
319#define SERIAL_XMIT_SIZE 4096
320#endif
321
322/*
323 * These macros define the offsets used in calculating the
324 * I/O address of the specified USC registers.
325 */
326
327
328#define DCPIN 2 /* Bit 1 of I/O address */
329#define SDPIN 4 /* Bit 2 of I/O address */
330
331#define DCAR 0 /* DMA command/address register */
332#define CCAR SDPIN /* channel command/address register */
333#define DATAREG DCPIN + SDPIN /* serial data register */
334#define MSBONLY 0x41
335#define LSBONLY 0x40
336
337/*
338 * These macros define the register address (ordinal number)
339 * used for writing address/value pairs to the USC.
340 */
341
342#define CMR 0x02 /* Channel mode Register */
343#define CCSR 0x04 /* Channel Command/status Register */
344#define CCR 0x06 /* Channel Control Register */
345#define PSR 0x08 /* Port status Register */
346#define PCR 0x0a /* Port Control Register */
347#define TMDR 0x0c /* Test mode Data Register */
348#define TMCR 0x0e /* Test mode Control Register */
349#define CMCR 0x10 /* Clock mode Control Register */
350#define HCR 0x12 /* Hardware Configuration Register */
351#define IVR 0x14 /* Interrupt Vector Register */
352#define IOCR 0x16 /* Input/Output Control Register */
353#define ICR 0x18 /* Interrupt Control Register */
354#define DCCR 0x1a /* Daisy Chain Control Register */
355#define MISR 0x1c /* Misc Interrupt status Register */
356#define SICR 0x1e /* status Interrupt Control Register */
357#define RDR 0x20 /* Receive Data Register */
358#define RMR 0x22 /* Receive mode Register */
359#define RCSR 0x24 /* Receive Command/status Register */
360#define RICR 0x26 /* Receive Interrupt Control Register */
361#define RSR 0x28 /* Receive Sync Register */
362#define RCLR 0x2a /* Receive count Limit Register */
363#define RCCR 0x2c /* Receive Character count Register */
364#define TC0R 0x2e /* Time Constant 0 Register */
365#define TDR 0x30 /* Transmit Data Register */
366#define TMR 0x32 /* Transmit mode Register */
367#define TCSR 0x34 /* Transmit Command/status Register */
368#define TICR 0x36 /* Transmit Interrupt Control Register */
369#define TSR 0x38 /* Transmit Sync Register */
370#define TCLR 0x3a /* Transmit count Limit Register */
371#define TCCR 0x3c /* Transmit Character count Register */
372#define TC1R 0x3e /* Time Constant 1 Register */
373
374
375/*
376 * MACRO DEFINITIONS FOR DMA REGISTERS
377 */
378
379#define DCR 0x06 /* DMA Control Register (shared) */
380#define DACR 0x08 /* DMA Array count Register (shared) */
381#define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
382#define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
383#define DICR 0x18 /* DMA Interrupt Control Register (shared) */
384#define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
385#define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
386
387#define TDMR 0x02 /* Transmit DMA mode Register */
388#define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
389#define TBCR 0x2a /* Transmit Byte count Register */
390#define TARL 0x2c /* Transmit Address Register (low) */
391#define TARU 0x2e /* Transmit Address Register (high) */
392#define NTBCR 0x3a /* Next Transmit Byte count Register */
393#define NTARL 0x3c /* Next Transmit Address Register (low) */
394#define NTARU 0x3e /* Next Transmit Address Register (high) */
395
396#define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
397#define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
398#define RBCR 0xaa /* Receive Byte count Register */
399#define RARL 0xac /* Receive Address Register (low) */
400#define RARU 0xae /* Receive Address Register (high) */
401#define NRBCR 0xba /* Next Receive Byte count Register */
402#define NRARL 0xbc /* Next Receive Address Register (low) */
403#define NRARU 0xbe /* Next Receive Address Register (high) */
404
405
406/*
407 * MACRO DEFINITIONS FOR MODEM STATUS BITS
408 */
409
410#define MODEMSTATUS_DTR 0x80
411#define MODEMSTATUS_DSR 0x40
412#define MODEMSTATUS_RTS 0x20
413#define MODEMSTATUS_CTS 0x10
414#define MODEMSTATUS_RI 0x04
415#define MODEMSTATUS_DCD 0x01
416
417
418/*
419 * Channel Command/Address Register (CCAR) Command Codes
420 */
421
422#define RTCmd_Null 0x0000
423#define RTCmd_ResetHighestIus 0x1000
424#define RTCmd_TriggerChannelLoadDma 0x2000
425#define RTCmd_TriggerRxDma 0x2800
426#define RTCmd_TriggerTxDma 0x3000
427#define RTCmd_TriggerRxAndTxDma 0x3800
428#define RTCmd_PurgeRxFifo 0x4800
429#define RTCmd_PurgeTxFifo 0x5000
430#define RTCmd_PurgeRxAndTxFifo 0x5800
431#define RTCmd_LoadRcc 0x6800
432#define RTCmd_LoadTcc 0x7000
433#define RTCmd_LoadRccAndTcc 0x7800
434#define RTCmd_LoadTC0 0x8800
435#define RTCmd_LoadTC1 0x9000
436#define RTCmd_LoadTC0AndTC1 0x9800
437#define RTCmd_SerialDataLSBFirst 0xa000
438#define RTCmd_SerialDataMSBFirst 0xa800
439#define RTCmd_SelectBigEndian 0xb000
440#define RTCmd_SelectLittleEndian 0xb800
441
442
443/*
444 * DMA Command/Address Register (DCAR) Command Codes
445 */
446
447#define DmaCmd_Null 0x0000
448#define DmaCmd_ResetTxChannel 0x1000
449#define DmaCmd_ResetRxChannel 0x1200
450#define DmaCmd_StartTxChannel 0x2000
451#define DmaCmd_StartRxChannel 0x2200
452#define DmaCmd_ContinueTxChannel 0x3000
453#define DmaCmd_ContinueRxChannel 0x3200
454#define DmaCmd_PauseTxChannel 0x4000
455#define DmaCmd_PauseRxChannel 0x4200
456#define DmaCmd_AbortTxChannel 0x5000
457#define DmaCmd_AbortRxChannel 0x5200
458#define DmaCmd_InitTxChannel 0x7000
459#define DmaCmd_InitRxChannel 0x7200
460#define DmaCmd_ResetHighestDmaIus 0x8000
461#define DmaCmd_ResetAllChannels 0x9000
462#define DmaCmd_StartAllChannels 0xa000
463#define DmaCmd_ContinueAllChannels 0xb000
464#define DmaCmd_PauseAllChannels 0xc000
465#define DmaCmd_AbortAllChannels 0xd000
466#define DmaCmd_InitAllChannels 0xf000
467
468#define TCmd_Null 0x0000
469#define TCmd_ClearTxCRC 0x2000
470#define TCmd_SelectTicrTtsaData 0x4000
471#define TCmd_SelectTicrTxFifostatus 0x5000
472#define TCmd_SelectTicrIntLevel 0x6000
473#define TCmd_SelectTicrdma_level 0x7000
474#define TCmd_SendFrame 0x8000
475#define TCmd_SendAbort 0x9000
476#define TCmd_EnableDleInsertion 0xc000
477#define TCmd_DisableDleInsertion 0xd000
478#define TCmd_ClearEofEom 0xe000
479#define TCmd_SetEofEom 0xf000
480
481#define RCmd_Null 0x0000
482#define RCmd_ClearRxCRC 0x2000
483#define RCmd_EnterHuntmode 0x3000
484#define RCmd_SelectRicrRtsaData 0x4000
485#define RCmd_SelectRicrRxFifostatus 0x5000
486#define RCmd_SelectRicrIntLevel 0x6000
487#define RCmd_SelectRicrdma_level 0x7000
488
489/*
490 * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
491 */
492
493#define RECEIVE_STATUS BIT5
494#define RECEIVE_DATA BIT4
495#define TRANSMIT_STATUS BIT3
496#define TRANSMIT_DATA BIT2
497#define IO_PIN BIT1
498#define MISC BIT0
499
500
501/*
502 * Receive status Bits in Receive Command/status Register RCSR
503 */
504
505#define RXSTATUS_SHORT_FRAME BIT8
506#define RXSTATUS_CODE_VIOLATION BIT8
507#define RXSTATUS_EXITED_HUNT BIT7
508#define RXSTATUS_IDLE_RECEIVED BIT6
509#define RXSTATUS_BREAK_RECEIVED BIT5
510#define RXSTATUS_ABORT_RECEIVED BIT5
511#define RXSTATUS_RXBOUND BIT4
512#define RXSTATUS_CRC_ERROR BIT3
513#define RXSTATUS_FRAMING_ERROR BIT3
514#define RXSTATUS_ABORT BIT2
515#define RXSTATUS_PARITY_ERROR BIT2
516#define RXSTATUS_OVERRUN BIT1
517#define RXSTATUS_DATA_AVAILABLE BIT0
518#define RXSTATUS_ALL 0x01f6
519#define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
520
521/*
522 * Values for setting transmit idle mode in
523 * Transmit Control/status Register (TCSR)
524 */
525#define IDLEMODE_FLAGS 0x0000
526#define IDLEMODE_ALT_ONE_ZERO 0x0100
527#define IDLEMODE_ZERO 0x0200
528#define IDLEMODE_ONE 0x0300
529#define IDLEMODE_ALT_MARK_SPACE 0x0500
530#define IDLEMODE_SPACE 0x0600
531#define IDLEMODE_MARK 0x0700
532#define IDLEMODE_MASK 0x0700
533
534/*
535 * IUSC revision identifiers
536 */
537#define IUSC_SL1660 0x4d44
538#define IUSC_PRE_SL1660 0x4553
539
540/*
541 * Transmit status Bits in Transmit Command/status Register (TCSR)
542 */
543
544#define TCSR_PRESERVE 0x0F00
545
546#define TCSR_UNDERWAIT BIT11
547#define TXSTATUS_PREAMBLE_SENT BIT7
548#define TXSTATUS_IDLE_SENT BIT6
549#define TXSTATUS_ABORT_SENT BIT5
550#define TXSTATUS_EOF_SENT BIT4
551#define TXSTATUS_EOM_SENT BIT4
552#define TXSTATUS_CRC_SENT BIT3
553#define TXSTATUS_ALL_SENT BIT2
554#define TXSTATUS_UNDERRUN BIT1
555#define TXSTATUS_FIFO_EMPTY BIT0
556#define TXSTATUS_ALL 0x00fa
557#define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
558
559
560#define MISCSTATUS_RXC_LATCHED BIT15
561#define MISCSTATUS_RXC BIT14
562#define MISCSTATUS_TXC_LATCHED BIT13
563#define MISCSTATUS_TXC BIT12
564#define MISCSTATUS_RI_LATCHED BIT11
565#define MISCSTATUS_RI BIT10
566#define MISCSTATUS_DSR_LATCHED BIT9
567#define MISCSTATUS_DSR BIT8
568#define MISCSTATUS_DCD_LATCHED BIT7
569#define MISCSTATUS_DCD BIT6
570#define MISCSTATUS_CTS_LATCHED BIT5
571#define MISCSTATUS_CTS BIT4
572#define MISCSTATUS_RCC_UNDERRUN BIT3
573#define MISCSTATUS_DPLL_NO_SYNC BIT2
574#define MISCSTATUS_BRG1_ZERO BIT1
575#define MISCSTATUS_BRG0_ZERO BIT0
576
577#define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
578#define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
579
580#define SICR_RXC_ACTIVE BIT15
581#define SICR_RXC_INACTIVE BIT14
582#define SICR_RXC (BIT15+BIT14)
583#define SICR_TXC_ACTIVE BIT13
584#define SICR_TXC_INACTIVE BIT12
585#define SICR_TXC (BIT13+BIT12)
586#define SICR_RI_ACTIVE BIT11
587#define SICR_RI_INACTIVE BIT10
588#define SICR_RI (BIT11+BIT10)
589#define SICR_DSR_ACTIVE BIT9
590#define SICR_DSR_INACTIVE BIT8
591#define SICR_DSR (BIT9+BIT8)
592#define SICR_DCD_ACTIVE BIT7
593#define SICR_DCD_INACTIVE BIT6
594#define SICR_DCD (BIT7+BIT6)
595#define SICR_CTS_ACTIVE BIT5
596#define SICR_CTS_INACTIVE BIT4
597#define SICR_CTS (BIT5+BIT4)
598#define SICR_RCC_UNDERFLOW BIT3
599#define SICR_DPLL_NO_SYNC BIT2
600#define SICR_BRG1_ZERO BIT1
601#define SICR_BRG0_ZERO BIT0
602
603void usc_DisableMasterIrqBit( struct mgsl_struct *info );
604void usc_EnableMasterIrqBit( struct mgsl_struct *info );
605void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
606void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
607void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
608
609#define usc_EnableInterrupts( a, b ) \
610 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
611
612#define usc_DisableInterrupts( a, b ) \
613 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
614
615#define usc_EnableMasterIrqBit(a) \
616 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
617
618#define usc_DisableMasterIrqBit(a) \
619 usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
620
621#define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
622
623/*
624 * Transmit status Bits in Transmit Control status Register (TCSR)
625 * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
626 */
627
628#define TXSTATUS_PREAMBLE_SENT BIT7
629#define TXSTATUS_IDLE_SENT BIT6
630#define TXSTATUS_ABORT_SENT BIT5
631#define TXSTATUS_EOF BIT4
632#define TXSTATUS_CRC_SENT BIT3
633#define TXSTATUS_ALL_SENT BIT2
634#define TXSTATUS_UNDERRUN BIT1
635#define TXSTATUS_FIFO_EMPTY BIT0
636
637#define DICR_MASTER BIT15
638#define DICR_TRANSMIT BIT0
639#define DICR_RECEIVE BIT1
640
641#define usc_EnableDmaInterrupts(a,b) \
642 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
643
644#define usc_DisableDmaInterrupts(a,b) \
645 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
646
647#define usc_EnableStatusIrqs(a,b) \
648 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
649
650#define usc_DisablestatusIrqs(a,b) \
651 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
652
653/* Transmit status Bits in Transmit Control status Register (TCSR) */
654/* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
655
656
657#define DISABLE_UNCONDITIONAL 0
658#define DISABLE_END_OF_FRAME 1
659#define ENABLE_UNCONDITIONAL 2
660#define ENABLE_AUTO_CTS 3
661#define ENABLE_AUTO_DCD 3
662#define usc_EnableTransmitter(a,b) \
663 usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
664#define usc_EnableReceiver(a,b) \
665 usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
666
667static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
668static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
669static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
670
671static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
672static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
673static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
674void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
675void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
676
677#define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
678#define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
679
680#define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
681
682static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
683static void usc_start_receiver( struct mgsl_struct *info );
684static void usc_stop_receiver( struct mgsl_struct *info );
685
686static void usc_start_transmitter( struct mgsl_struct *info );
687static void usc_stop_transmitter( struct mgsl_struct *info );
688static void usc_set_txidle( struct mgsl_struct *info );
689static void usc_load_txfifo( struct mgsl_struct *info );
690
691static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
692static void usc_enable_loopback( struct mgsl_struct *info, int enable );
693
694static void usc_get_serial_signals( struct mgsl_struct *info );
695static void usc_set_serial_signals( struct mgsl_struct *info );
696
697static void usc_reset( struct mgsl_struct *info );
698
699static void usc_set_sync_mode( struct mgsl_struct *info );
700static void usc_set_sdlc_mode( struct mgsl_struct *info );
701static void usc_set_async_mode( struct mgsl_struct *info );
702static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
703
704static void usc_loopback_frame( struct mgsl_struct *info );
705
706static void mgsl_tx_timeout(unsigned long context);
707
708
709static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
710static void usc_loopmode_insert_request( struct mgsl_struct * info );
711static int usc_loopmode_active( struct mgsl_struct * info);
712static void usc_loopmode_send_done( struct mgsl_struct * info );
713
714static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
715
716#if SYNCLINK_GENERIC_HDLC
717#define dev_to_port(D) (dev_to_hdlc(D)->priv)
718static void hdlcdev_tx_done(struct mgsl_struct *info);
719static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
720static int hdlcdev_init(struct mgsl_struct *info);
721static void hdlcdev_exit(struct mgsl_struct *info);
722#endif
723
724/*
725 * Defines a BUS descriptor value for the PCI adapter
726 * local bus address ranges.
727 */
728
729#define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
730(0x00400020 + \
731((WrHold) << 30) + \
732((WrDly) << 28) + \
733((RdDly) << 26) + \
734((Nwdd) << 20) + \
735((Nwad) << 15) + \
736((Nxda) << 13) + \
737((Nrdd) << 11) + \
738((Nrad) << 6) )
739
740static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
741
742/*
743 * Adapter diagnostic routines
744 */
745static bool mgsl_register_test( struct mgsl_struct *info );
746static bool mgsl_irq_test( struct mgsl_struct *info );
747static bool mgsl_dma_test( struct mgsl_struct *info );
748static bool mgsl_memory_test( struct mgsl_struct *info );
749static int mgsl_adapter_test( struct mgsl_struct *info );
750
751/*
752 * device and resource management routines
753 */
754static int mgsl_claim_resources(struct mgsl_struct *info);
755static void mgsl_release_resources(struct mgsl_struct *info);
756static void mgsl_add_device(struct mgsl_struct *info);
757static struct mgsl_struct* mgsl_allocate_device(void);
758
759/*
760 * DMA buffer manupulation functions.
761 */
762static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
763static bool mgsl_get_rx_frame( struct mgsl_struct *info );
764static bool mgsl_get_raw_rx_frame( struct mgsl_struct *info );
765static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
766static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
767static int num_free_tx_dma_buffers(struct mgsl_struct *info);
768static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
769static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
770
771/*
772 * DMA and Shared Memory buffer allocation and formatting
773 */
774static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
775static void mgsl_free_dma_buffers(struct mgsl_struct *info);
776static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
777static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
778static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
779static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
780static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
781static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
782static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
783static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
784static bool load_next_tx_holding_buffer(struct mgsl_struct *info);
785static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
786
787/*
788 * Bottom half interrupt handlers
789 */
790static void mgsl_bh_handler(struct work_struct *work);
791static void mgsl_bh_receive(struct mgsl_struct *info);
792static void mgsl_bh_transmit(struct mgsl_struct *info);
793static void mgsl_bh_status(struct mgsl_struct *info);
794
795/*
796 * Interrupt handler routines and dispatch table.
797 */
798static void mgsl_isr_null( struct mgsl_struct *info );
799static void mgsl_isr_transmit_data( struct mgsl_struct *info );
800static void mgsl_isr_receive_data( struct mgsl_struct *info );
801static void mgsl_isr_receive_status( struct mgsl_struct *info );
802static void mgsl_isr_transmit_status( struct mgsl_struct *info );
803static void mgsl_isr_io_pin( struct mgsl_struct *info );
804static void mgsl_isr_misc( struct mgsl_struct *info );
805static void mgsl_isr_receive_dma( struct mgsl_struct *info );
806static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
807
808typedef void (*isr_dispatch_func)(struct mgsl_struct *);
809
810static isr_dispatch_func UscIsrTable[7] =
811{
812 mgsl_isr_null,
813 mgsl_isr_misc,
814 mgsl_isr_io_pin,
815 mgsl_isr_transmit_data,
816 mgsl_isr_transmit_status,
817 mgsl_isr_receive_data,
818 mgsl_isr_receive_status
819};
820
821/*
822 * ioctl call handlers
823 */
824static int tiocmget(struct tty_struct *tty);
825static int tiocmset(struct tty_struct *tty,
826 unsigned int set, unsigned int clear);
827static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
828 __user *user_icount);
829static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
830static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
831static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
832static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
833static int mgsl_txenable(struct mgsl_struct * info, int enable);
834static int mgsl_txabort(struct mgsl_struct * info);
835static int mgsl_rxenable(struct mgsl_struct * info, int enable);
836static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
837static int mgsl_loopmode_send_done( struct mgsl_struct * info );
838
839/* set non-zero on successful registration with PCI subsystem */
840static bool pci_registered;
841
842/*
843 * Global linked list of SyncLink devices
844 */
845static struct mgsl_struct *mgsl_device_list;
846static int mgsl_device_count;
847
848/*
849 * Set this param to non-zero to load eax with the
850 * .text section address and breakpoint on module load.
851 * This is useful for use with gdb and add-symbol-file command.
852 */
853static int break_on_load;
854
855/*
856 * Driver major number, defaults to zero to get auto
857 * assigned major number. May be forced as module parameter.
858 */
859static int ttymajor;
860
861/*
862 * Array of user specified options for ISA adapters.
863 */
864static int io[MAX_ISA_DEVICES];
865static int irq[MAX_ISA_DEVICES];
866static int dma[MAX_ISA_DEVICES];
867static int debug_level;
868static int maxframe[MAX_TOTAL_DEVICES];
869static int txdmabufs[MAX_TOTAL_DEVICES];
870static int txholdbufs[MAX_TOTAL_DEVICES];
871
872module_param(break_on_load, bool, 0);
873module_param(ttymajor, int, 0);
874module_param_array(io, int, NULL, 0);
875module_param_array(irq, int, NULL, 0);
876module_param_array(dma, int, NULL, 0);
877module_param(debug_level, int, 0);
878module_param_array(maxframe, int, NULL, 0);
879module_param_array(txdmabufs, int, NULL, 0);
880module_param_array(txholdbufs, int, NULL, 0);
881
882static char *driver_name = "SyncLink serial driver";
883static char *driver_version = "$Revision: 4.38 $";
884
885static int synclink_init_one (struct pci_dev *dev,
886 const struct pci_device_id *ent);
887static void synclink_remove_one (struct pci_dev *dev);
888
889static struct pci_device_id synclink_pci_tbl[] = {
890 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
891 { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
892 { 0, }, /* terminate list */
893};
894MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
895
896MODULE_LICENSE("GPL");
897
898static struct pci_driver synclink_pci_driver = {
899 .name = "synclink",
900 .id_table = synclink_pci_tbl,
901 .probe = synclink_init_one,
902 .remove = __devexit_p(synclink_remove_one),
903};
904
905static struct tty_driver *serial_driver;
906
907/* number of characters left in xmit buffer before we ask for more */
908#define WAKEUP_CHARS 256
909
910
911static void mgsl_change_params(struct mgsl_struct *info);
912static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
913
914/*
915 * 1st function defined in .text section. Calling this function in
916 * init_module() followed by a breakpoint allows a remote debugger
917 * (gdb) to get the .text address for the add-symbol-file command.
918 * This allows remote debugging of dynamically loadable modules.
919 */
920static void* mgsl_get_text_ptr(void)
921{
922 return mgsl_get_text_ptr;
923}
924
925static inline int mgsl_paranoia_check(struct mgsl_struct *info,
926 char *name, const char *routine)
927{
928#ifdef MGSL_PARANOIA_CHECK
929 static const char *badmagic =
930 "Warning: bad magic number for mgsl struct (%s) in %s\n";
931 static const char *badinfo =
932 "Warning: null mgsl_struct for (%s) in %s\n";
933
934 if (!info) {
935 printk(badinfo, name, routine);
936 return 1;
937 }
938 if (info->magic != MGSL_MAGIC) {
939 printk(badmagic, name, routine);
940 return 1;
941 }
942#else
943 if (!info)
944 return 1;
945#endif
946 return 0;
947}
948
949/**
950 * line discipline callback wrappers
951 *
952 * The wrappers maintain line discipline references
953 * while calling into the line discipline.
954 *
955 * ldisc_receive_buf - pass receive data to line discipline
956 */
957
958static void ldisc_receive_buf(struct tty_struct *tty,
959 const __u8 *data, char *flags, int count)
960{
961 struct tty_ldisc *ld;
962 if (!tty)
963 return;
964 ld = tty_ldisc_ref(tty);
965 if (ld) {
966 if (ld->ops->receive_buf)
967 ld->ops->receive_buf(tty, data, flags, count);
968 tty_ldisc_deref(ld);
969 }
970}
971
972/* mgsl_stop() throttle (stop) transmitter
973 *
974 * Arguments: tty pointer to tty info structure
975 * Return Value: None
976 */
977static void mgsl_stop(struct tty_struct *tty)
978{
979 struct mgsl_struct *info = tty->driver_data;
980 unsigned long flags;
981
982 if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
983 return;
984
985 if ( debug_level >= DEBUG_LEVEL_INFO )
986 printk("mgsl_stop(%s)\n",info->device_name);
987
988 spin_lock_irqsave(&info->irq_spinlock,flags);
989 if (info->tx_enabled)
990 usc_stop_transmitter(info);
991 spin_unlock_irqrestore(&info->irq_spinlock,flags);
992
993} /* end of mgsl_stop() */
994
995/* mgsl_start() release (start) transmitter
996 *
997 * Arguments: tty pointer to tty info structure
998 * Return Value: None
999 */
1000static void mgsl_start(struct tty_struct *tty)
1001{
1002 struct mgsl_struct *info = tty->driver_data;
1003 unsigned long flags;
1004
1005 if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1006 return;
1007
1008 if ( debug_level >= DEBUG_LEVEL_INFO )
1009 printk("mgsl_start(%s)\n",info->device_name);
1010
1011 spin_lock_irqsave(&info->irq_spinlock,flags);
1012 if (!info->tx_enabled)
1013 usc_start_transmitter(info);
1014 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1015
1016} /* end of mgsl_start() */
1017
1018/*
1019 * Bottom half work queue access functions
1020 */
1021
1022/* mgsl_bh_action() Return next bottom half action to perform.
1023 * Return Value: BH action code or 0 if nothing to do.
1024 */
1025static int mgsl_bh_action(struct mgsl_struct *info)
1026{
1027 unsigned long flags;
1028 int rc = 0;
1029
1030 spin_lock_irqsave(&info->irq_spinlock,flags);
1031
1032 if (info->pending_bh & BH_RECEIVE) {
1033 info->pending_bh &= ~BH_RECEIVE;
1034 rc = BH_RECEIVE;
1035 } else if (info->pending_bh & BH_TRANSMIT) {
1036 info->pending_bh &= ~BH_TRANSMIT;
1037 rc = BH_TRANSMIT;
1038 } else if (info->pending_bh & BH_STATUS) {
1039 info->pending_bh &= ~BH_STATUS;
1040 rc = BH_STATUS;
1041 }
1042
1043 if (!rc) {
1044 /* Mark BH routine as complete */
1045 info->bh_running = false;
1046 info->bh_requested = false;
1047 }
1048
1049 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1050
1051 return rc;
1052}
1053
1054/*
1055 * Perform bottom half processing of work items queued by ISR.
1056 */
1057static void mgsl_bh_handler(struct work_struct *work)
1058{
1059 struct mgsl_struct *info =
1060 container_of(work, struct mgsl_struct, task);
1061 int action;
1062
1063 if (!info)
1064 return;
1065
1066 if ( debug_level >= DEBUG_LEVEL_BH )
1067 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1068 __FILE__,__LINE__,info->device_name);
1069
1070 info->bh_running = true;
1071
1072 while((action = mgsl_bh_action(info)) != 0) {
1073
1074 /* Process work item */
1075 if ( debug_level >= DEBUG_LEVEL_BH )
1076 printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1077 __FILE__,__LINE__,action);
1078
1079 switch (action) {
1080
1081 case BH_RECEIVE:
1082 mgsl_bh_receive(info);
1083 break;
1084 case BH_TRANSMIT:
1085 mgsl_bh_transmit(info);
1086 break;
1087 case BH_STATUS:
1088 mgsl_bh_status(info);
1089 break;
1090 default:
1091 /* unknown work item ID */
1092 printk("Unknown work item ID=%08X!\n", action);
1093 break;
1094 }
1095 }
1096
1097 if ( debug_level >= DEBUG_LEVEL_BH )
1098 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1099 __FILE__,__LINE__,info->device_name);
1100}
1101
1102static void mgsl_bh_receive(struct mgsl_struct *info)
1103{
1104 bool (*get_rx_frame)(struct mgsl_struct *info) =
1105 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1106
1107 if ( debug_level >= DEBUG_LEVEL_BH )
1108 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1109 __FILE__,__LINE__,info->device_name);
1110
1111 do
1112 {
1113 if (info->rx_rcc_underrun) {
1114 unsigned long flags;
1115 spin_lock_irqsave(&info->irq_spinlock,flags);
1116 usc_start_receiver(info);
1117 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1118 return;
1119 }
1120 } while(get_rx_frame(info));
1121}
1122
1123static void mgsl_bh_transmit(struct mgsl_struct *info)
1124{
1125 struct tty_struct *tty = info->port.tty;
1126 unsigned long flags;
1127
1128 if ( debug_level >= DEBUG_LEVEL_BH )
1129 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1130 __FILE__,__LINE__,info->device_name);
1131
1132 if (tty)
1133 tty_wakeup(tty);
1134
1135 /* if transmitter idle and loopmode_send_done_requested
1136 * then start echoing RxD to TxD
1137 */
1138 spin_lock_irqsave(&info->irq_spinlock,flags);
1139 if ( !info->tx_active && info->loopmode_send_done_requested )
1140 usc_loopmode_send_done( info );
1141 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1142}
1143
1144static void mgsl_bh_status(struct mgsl_struct *info)
1145{
1146 if ( debug_level >= DEBUG_LEVEL_BH )
1147 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1148 __FILE__,__LINE__,info->device_name);
1149
1150 info->ri_chkcount = 0;
1151 info->dsr_chkcount = 0;
1152 info->dcd_chkcount = 0;
1153 info->cts_chkcount = 0;
1154}
1155
1156/* mgsl_isr_receive_status()
1157 *
1158 * Service a receive status interrupt. The type of status
1159 * interrupt is indicated by the state of the RCSR.
1160 * This is only used for HDLC mode.
1161 *
1162 * Arguments: info pointer to device instance data
1163 * Return Value: None
1164 */
1165static void mgsl_isr_receive_status( struct mgsl_struct *info )
1166{
1167 u16 status = usc_InReg( info, RCSR );
1168
1169 if ( debug_level >= DEBUG_LEVEL_ISR )
1170 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1171 __FILE__,__LINE__,status);
1172
1173 if ( (status & RXSTATUS_ABORT_RECEIVED) &&
1174 info->loopmode_insert_requested &&
1175 usc_loopmode_active(info) )
1176 {
1177 ++info->icount.rxabort;
1178 info->loopmode_insert_requested = false;
1179
1180 /* clear CMR:13 to start echoing RxD to TxD */
1181 info->cmr_value &= ~BIT13;
1182 usc_OutReg(info, CMR, info->cmr_value);
1183
1184 /* disable received abort irq (no longer required) */
1185 usc_OutReg(info, RICR,
1186 (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1187 }
1188
1189 if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
1190 if (status & RXSTATUS_EXITED_HUNT)
1191 info->icount.exithunt++;
1192 if (status & RXSTATUS_IDLE_RECEIVED)
1193 info->icount.rxidle++;
1194 wake_up_interruptible(&info->event_wait_q);
1195 }
1196
1197 if (status & RXSTATUS_OVERRUN){
1198 info->icount.rxover++;
1199 usc_process_rxoverrun_sync( info );
1200 }
1201
1202 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1203 usc_UnlatchRxstatusBits( info, status );
1204
1205} /* end of mgsl_isr_receive_status() */
1206
1207/* mgsl_isr_transmit_status()
1208 *
1209 * Service a transmit status interrupt
1210 * HDLC mode :end of transmit frame
1211 * Async mode:all data is sent
1212 * transmit status is indicated by bits in the TCSR.
1213 *
1214 * Arguments: info pointer to device instance data
1215 * Return Value: None
1216 */
1217static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1218{
1219 u16 status = usc_InReg( info, TCSR );
1220
1221 if ( debug_level >= DEBUG_LEVEL_ISR )
1222 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1223 __FILE__,__LINE__,status);
1224
1225 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1226 usc_UnlatchTxstatusBits( info, status );
1227
1228 if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1229 {
1230 /* finished sending HDLC abort. This may leave */
1231 /* the TxFifo with data from the aborted frame */
1232 /* so purge the TxFifo. Also shutdown the DMA */
1233 /* channel in case there is data remaining in */
1234 /* the DMA buffer */
1235 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1236 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1237 }
1238
1239 if ( status & TXSTATUS_EOF_SENT )
1240 info->icount.txok++;
1241 else if ( status & TXSTATUS_UNDERRUN )
1242 info->icount.txunder++;
1243 else if ( status & TXSTATUS_ABORT_SENT )
1244 info->icount.txabort++;
1245 else
1246 info->icount.txunder++;
1247
1248 info->tx_active = false;
1249 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1250 del_timer(&info->tx_timer);
1251
1252 if ( info->drop_rts_on_tx_done ) {
1253 usc_get_serial_signals( info );
1254 if ( info->serial_signals & SerialSignal_RTS ) {
1255 info->serial_signals &= ~SerialSignal_RTS;
1256 usc_set_serial_signals( info );
1257 }
1258 info->drop_rts_on_tx_done = false;
1259 }
1260
1261#if SYNCLINK_GENERIC_HDLC
1262 if (info->netcount)
1263 hdlcdev_tx_done(info);
1264 else
1265#endif
1266 {
1267 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1268 usc_stop_transmitter(info);
1269 return;
1270 }
1271 info->pending_bh |= BH_TRANSMIT;
1272 }
1273
1274} /* end of mgsl_isr_transmit_status() */
1275
1276/* mgsl_isr_io_pin()
1277 *
1278 * Service an Input/Output pin interrupt. The type of
1279 * interrupt is indicated by bits in the MISR
1280 *
1281 * Arguments: info pointer to device instance data
1282 * Return Value: None
1283 */
1284static void mgsl_isr_io_pin( struct mgsl_struct *info )
1285{
1286 struct mgsl_icount *icount;
1287 u16 status = usc_InReg( info, MISR );
1288
1289 if ( debug_level >= DEBUG_LEVEL_ISR )
1290 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1291 __FILE__,__LINE__,status);
1292
1293 usc_ClearIrqPendingBits( info, IO_PIN );
1294 usc_UnlatchIostatusBits( info, status );
1295
1296 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1297 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1298 icount = &info->icount;
1299 /* update input line counters */
1300 if (status & MISCSTATUS_RI_LATCHED) {
1301 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1302 usc_DisablestatusIrqs(info,SICR_RI);
1303 icount->rng++;
1304 if ( status & MISCSTATUS_RI )
1305 info->input_signal_events.ri_up++;
1306 else
1307 info->input_signal_events.ri_down++;
1308 }
1309 if (status & MISCSTATUS_DSR_LATCHED) {
1310 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1311 usc_DisablestatusIrqs(info,SICR_DSR);
1312 icount->dsr++;
1313 if ( status & MISCSTATUS_DSR )
1314 info->input_signal_events.dsr_up++;
1315 else
1316 info->input_signal_events.dsr_down++;
1317 }
1318 if (status & MISCSTATUS_DCD_LATCHED) {
1319 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1320 usc_DisablestatusIrqs(info,SICR_DCD);
1321 icount->dcd++;
1322 if (status & MISCSTATUS_DCD) {
1323 info->input_signal_events.dcd_up++;
1324 } else
1325 info->input_signal_events.dcd_down++;
1326#if SYNCLINK_GENERIC_HDLC
1327 if (info->netcount) {
1328 if (status & MISCSTATUS_DCD)
1329 netif_carrier_on(info->netdev);
1330 else
1331 netif_carrier_off(info->netdev);
1332 }
1333#endif
1334 }
1335 if (status & MISCSTATUS_CTS_LATCHED)
1336 {
1337 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1338 usc_DisablestatusIrqs(info,SICR_CTS);
1339 icount->cts++;
1340 if ( status & MISCSTATUS_CTS )
1341 info->input_signal_events.cts_up++;
1342 else
1343 info->input_signal_events.cts_down++;
1344 }
1345 wake_up_interruptible(&info->status_event_wait_q);
1346 wake_up_interruptible(&info->event_wait_q);
1347
1348 if ( (info->port.flags & ASYNC_CHECK_CD) &&
1349 (status & MISCSTATUS_DCD_LATCHED) ) {
1350 if ( debug_level >= DEBUG_LEVEL_ISR )
1351 printk("%s CD now %s...", info->device_name,
1352 (status & MISCSTATUS_DCD) ? "on" : "off");
1353 if (status & MISCSTATUS_DCD)
1354 wake_up_interruptible(&info->port.open_wait);
1355 else {
1356 if ( debug_level >= DEBUG_LEVEL_ISR )
1357 printk("doing serial hangup...");
1358 if (info->port.tty)
1359 tty_hangup(info->port.tty);
1360 }
1361 }
1362
1363 if ( (info->port.flags & ASYNC_CTS_FLOW) &&
1364 (status & MISCSTATUS_CTS_LATCHED) ) {
1365 if (info->port.tty->hw_stopped) {
1366 if (status & MISCSTATUS_CTS) {
1367 if ( debug_level >= DEBUG_LEVEL_ISR )
1368 printk("CTS tx start...");
1369 if (info->port.tty)
1370 info->port.tty->hw_stopped = 0;
1371 usc_start_transmitter(info);
1372 info->pending_bh |= BH_TRANSMIT;
1373 return;
1374 }
1375 } else {
1376 if (!(status & MISCSTATUS_CTS)) {
1377 if ( debug_level >= DEBUG_LEVEL_ISR )
1378 printk("CTS tx stop...");
1379 if (info->port.tty)
1380 info->port.tty->hw_stopped = 1;
1381 usc_stop_transmitter(info);
1382 }
1383 }
1384 }
1385 }
1386
1387 info->pending_bh |= BH_STATUS;
1388
1389 /* for diagnostics set IRQ flag */
1390 if ( status & MISCSTATUS_TXC_LATCHED ){
1391 usc_OutReg( info, SICR,
1392 (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1393 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1394 info->irq_occurred = true;
1395 }
1396
1397} /* end of mgsl_isr_io_pin() */
1398
1399/* mgsl_isr_transmit_data()
1400 *
1401 * Service a transmit data interrupt (async mode only).
1402 *
1403 * Arguments: info pointer to device instance data
1404 * Return Value: None
1405 */
1406static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1407{
1408 if ( debug_level >= DEBUG_LEVEL_ISR )
1409 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1410 __FILE__,__LINE__,info->xmit_cnt);
1411
1412 usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1413
1414 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1415 usc_stop_transmitter(info);
1416 return;
1417 }
1418
1419 if ( info->xmit_cnt )
1420 usc_load_txfifo( info );
1421 else
1422 info->tx_active = false;
1423
1424 if (info->xmit_cnt < WAKEUP_CHARS)
1425 info->pending_bh |= BH_TRANSMIT;
1426
1427} /* end of mgsl_isr_transmit_data() */
1428
1429/* mgsl_isr_receive_data()
1430 *
1431 * Service a receive data interrupt. This occurs
1432 * when operating in asynchronous interrupt transfer mode.
1433 * The receive data FIFO is flushed to the receive data buffers.
1434 *
1435 * Arguments: info pointer to device instance data
1436 * Return Value: None
1437 */
1438static void mgsl_isr_receive_data( struct mgsl_struct *info )
1439{
1440 int Fifocount;
1441 u16 status;
1442 int work = 0;
1443 unsigned char DataByte;
1444 struct tty_struct *tty = info->port.tty;
1445 struct mgsl_icount *icount = &info->icount;
1446
1447 if ( debug_level >= DEBUG_LEVEL_ISR )
1448 printk("%s(%d):mgsl_isr_receive_data\n",
1449 __FILE__,__LINE__);
1450
1451 usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1452
1453 /* select FIFO status for RICR readback */
1454 usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1455
1456 /* clear the Wordstatus bit so that status readback */
1457 /* only reflects the status of this byte */
1458 usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1459
1460 /* flush the receive FIFO */
1461
1462 while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1463 int flag;
1464
1465 /* read one byte from RxFIFO */
1466 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1467 info->io_base + CCAR );
1468 DataByte = inb( info->io_base + CCAR );
1469
1470 /* get the status of the received byte */
1471 status = usc_InReg(info, RCSR);
1472 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1473 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
1474 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1475
1476 icount->rx++;
1477
1478 flag = 0;
1479 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1480 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
1481 printk("rxerr=%04X\n",status);
1482 /* update error statistics */
1483 if ( status & RXSTATUS_BREAK_RECEIVED ) {
1484 status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
1485 icount->brk++;
1486 } else if (status & RXSTATUS_PARITY_ERROR)
1487 icount->parity++;
1488 else if (status & RXSTATUS_FRAMING_ERROR)
1489 icount->frame++;
1490 else if (status & RXSTATUS_OVERRUN) {
1491 /* must issue purge fifo cmd before */
1492 /* 16C32 accepts more receive chars */
1493 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1494 icount->overrun++;
1495 }
1496
1497 /* discard char if tty control flags say so */
1498 if (status & info->ignore_status_mask)
1499 continue;
1500
1501 status &= info->read_status_mask;
1502
1503 if (status & RXSTATUS_BREAK_RECEIVED) {
1504 flag = TTY_BREAK;
1505 if (info->port.flags & ASYNC_SAK)
1506 do_SAK(tty);
1507 } else if (status & RXSTATUS_PARITY_ERROR)
1508 flag = TTY_PARITY;
1509 else if (status & RXSTATUS_FRAMING_ERROR)
1510 flag = TTY_FRAME;
1511 } /* end of if (error) */
1512 tty_insert_flip_char(tty, DataByte, flag);
1513 if (status & RXSTATUS_OVERRUN) {
1514 /* Overrun is special, since it's
1515 * reported immediately, and doesn't
1516 * affect the current character
1517 */
1518 work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1519 }
1520 }
1521
1522 if ( debug_level >= DEBUG_LEVEL_ISR ) {
1523 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1524 __FILE__,__LINE__,icount->rx,icount->brk,
1525 icount->parity,icount->frame,icount->overrun);
1526 }
1527
1528 if(work)
1529 tty_flip_buffer_push(tty);
1530}
1531
1532/* mgsl_isr_misc()
1533 *
1534 * Service a miscellaneous interrupt source.
1535 *
1536 * Arguments: info pointer to device extension (instance data)
1537 * Return Value: None
1538 */
1539static void mgsl_isr_misc( struct mgsl_struct *info )
1540{
1541 u16 status = usc_InReg( info, MISR );
1542
1543 if ( debug_level >= DEBUG_LEVEL_ISR )
1544 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1545 __FILE__,__LINE__,status);
1546
1547 if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1548 (info->params.mode == MGSL_MODE_HDLC)) {
1549
1550 /* turn off receiver and rx DMA */
1551 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1552 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1553 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1554 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
1555 usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
1556
1557 /* schedule BH handler to restart receiver */
1558 info->pending_bh |= BH_RECEIVE;
1559 info->rx_rcc_underrun = true;
1560 }
1561
1562 usc_ClearIrqPendingBits( info, MISC );
1563 usc_UnlatchMiscstatusBits( info, status );
1564
1565} /* end of mgsl_isr_misc() */
1566
1567/* mgsl_isr_null()
1568 *
1569 * Services undefined interrupt vectors from the
1570 * USC. (hence this function SHOULD never be called)
1571 *
1572 * Arguments: info pointer to device extension (instance data)
1573 * Return Value: None
1574 */
1575static void mgsl_isr_null( struct mgsl_struct *info )
1576{
1577
1578} /* end of mgsl_isr_null() */
1579
1580/* mgsl_isr_receive_dma()
1581 *
1582 * Service a receive DMA channel interrupt.
1583 * For this driver there are two sources of receive DMA interrupts
1584 * as identified in the Receive DMA mode Register (RDMR):
1585 *
1586 * BIT3 EOA/EOL End of List, all receive buffers in receive
1587 * buffer list have been filled (no more free buffers
1588 * available). The DMA controller has shut down.
1589 *
1590 * BIT2 EOB End of Buffer. This interrupt occurs when a receive
1591 * DMA buffer is terminated in response to completion
1592 * of a good frame or a frame with errors. The status
1593 * of the frame is stored in the buffer entry in the
1594 * list of receive buffer entries.
1595 *
1596 * Arguments: info pointer to device instance data
1597 * Return Value: None
1598 */
1599static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1600{
1601 u16 status;
1602
1603 /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1604 usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
1605
1606 /* Read the receive DMA status to identify interrupt type. */
1607 /* This also clears the status bits. */
1608 status = usc_InDmaReg( info, RDMR );
1609
1610 if ( debug_level >= DEBUG_LEVEL_ISR )
1611 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1612 __FILE__,__LINE__,info->device_name,status);
1613
1614 info->pending_bh |= BH_RECEIVE;
1615
1616 if ( status & BIT3 ) {
1617 info->rx_overflow = true;
1618 info->icount.buf_overrun++;
1619 }
1620
1621} /* end of mgsl_isr_receive_dma() */
1622
1623/* mgsl_isr_transmit_dma()
1624 *
1625 * This function services a transmit DMA channel interrupt.
1626 *
1627 * For this driver there is one source of transmit DMA interrupts
1628 * as identified in the Transmit DMA Mode Register (TDMR):
1629 *
1630 * BIT2 EOB End of Buffer. This interrupt occurs when a
1631 * transmit DMA buffer has been emptied.
1632 *
1633 * The driver maintains enough transmit DMA buffers to hold at least
1634 * one max frame size transmit frame. When operating in a buffered
1635 * transmit mode, there may be enough transmit DMA buffers to hold at
1636 * least two or more max frame size frames. On an EOB condition,
1637 * determine if there are any queued transmit buffers and copy into
1638 * transmit DMA buffers if we have room.
1639 *
1640 * Arguments: info pointer to device instance data
1641 * Return Value: None
1642 */
1643static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1644{
1645 u16 status;
1646
1647 /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1648 usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
1649
1650 /* Read the transmit DMA status to identify interrupt type. */
1651 /* This also clears the status bits. */
1652
1653 status = usc_InDmaReg( info, TDMR );
1654
1655 if ( debug_level >= DEBUG_LEVEL_ISR )
1656 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1657 __FILE__,__LINE__,info->device_name,status);
1658
1659 if ( status & BIT2 ) {
1660 --info->tx_dma_buffers_used;
1661
1662 /* if there are transmit frames queued,
1663 * try to load the next one
1664 */
1665 if ( load_next_tx_holding_buffer(info) ) {
1666 /* if call returns non-zero value, we have
1667 * at least one free tx holding buffer
1668 */
1669 info->pending_bh |= BH_TRANSMIT;
1670 }
1671 }
1672
1673} /* end of mgsl_isr_transmit_dma() */
1674
1675/* mgsl_interrupt()
1676 *
1677 * Interrupt service routine entry point.
1678 *
1679 * Arguments:
1680 *
1681 * irq interrupt number that caused interrupt
1682 * dev_id device ID supplied during interrupt registration
1683 *
1684 * Return Value: None
1685 */
1686static irqreturn_t mgsl_interrupt(int dummy, void *dev_id)
1687{
1688 struct mgsl_struct *info = dev_id;
1689 u16 UscVector;
1690 u16 DmaVector;
1691
1692 if ( debug_level >= DEBUG_LEVEL_ISR )
1693 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)entry.\n",
1694 __FILE__, __LINE__, info->irq_level);
1695
1696 spin_lock(&info->irq_spinlock);
1697
1698 for(;;) {
1699 /* Read the interrupt vectors from hardware. */
1700 UscVector = usc_InReg(info, IVR) >> 9;
1701 DmaVector = usc_InDmaReg(info, DIVR);
1702
1703 if ( debug_level >= DEBUG_LEVEL_ISR )
1704 printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1705 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1706
1707 if ( !UscVector && !DmaVector )
1708 break;
1709
1710 /* Dispatch interrupt vector */
1711 if ( UscVector )
1712 (*UscIsrTable[UscVector])(info);
1713 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1714 mgsl_isr_transmit_dma(info);
1715 else
1716 mgsl_isr_receive_dma(info);
1717
1718 if ( info->isr_overflow ) {
1719 printk(KERN_ERR "%s(%d):%s isr overflow irq=%d\n",
1720 __FILE__, __LINE__, info->device_name, info->irq_level);
1721 usc_DisableMasterIrqBit(info);
1722 usc_DisableDmaInterrupts(info,DICR_MASTER);
1723 break;
1724 }
1725 }
1726
1727 /* Request bottom half processing if there's something
1728 * for it to do and the bh is not already running
1729 */
1730
1731 if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1732 if ( debug_level >= DEBUG_LEVEL_ISR )
1733 printk("%s(%d):%s queueing bh task.\n",
1734 __FILE__,__LINE__,info->device_name);
1735 schedule_work(&info->task);
1736 info->bh_requested = true;
1737 }
1738
1739 spin_unlock(&info->irq_spinlock);
1740
1741 if ( debug_level >= DEBUG_LEVEL_ISR )
1742 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)exit.\n",
1743 __FILE__, __LINE__, info->irq_level);
1744
1745 return IRQ_HANDLED;
1746} /* end of mgsl_interrupt() */
1747
1748/* startup()
1749 *
1750 * Initialize and start device.
1751 *
1752 * Arguments: info pointer to device instance data
1753 * Return Value: 0 if success, otherwise error code
1754 */
1755static int startup(struct mgsl_struct * info)
1756{
1757 int retval = 0;
1758
1759 if ( debug_level >= DEBUG_LEVEL_INFO )
1760 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1761
1762 if (info->port.flags & ASYNC_INITIALIZED)
1763 return 0;
1764
1765 if (!info->xmit_buf) {
1766 /* allocate a page of memory for a transmit buffer */
1767 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1768 if (!info->xmit_buf) {
1769 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1770 __FILE__,__LINE__,info->device_name);
1771 return -ENOMEM;
1772 }
1773 }
1774
1775 info->pending_bh = 0;
1776
1777 memset(&info->icount, 0, sizeof(info->icount));
1778
1779 setup_timer(&info->tx_timer, mgsl_tx_timeout, (unsigned long)info);
1780
1781 /* Allocate and claim adapter resources */
1782 retval = mgsl_claim_resources(info);
1783
1784 /* perform existence check and diagnostics */
1785 if ( !retval )
1786 retval = mgsl_adapter_test(info);
1787
1788 if ( retval ) {
1789 if (capable(CAP_SYS_ADMIN) && info->port.tty)
1790 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1791 mgsl_release_resources(info);
1792 return retval;
1793 }
1794
1795 /* program hardware for current parameters */
1796 mgsl_change_params(info);
1797
1798 if (info->port.tty)
1799 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
1800
1801 info->port.flags |= ASYNC_INITIALIZED;
1802
1803 return 0;
1804
1805} /* end of startup() */
1806
1807/* shutdown()
1808 *
1809 * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1810 *
1811 * Arguments: info pointer to device instance data
1812 * Return Value: None
1813 */
1814static void shutdown(struct mgsl_struct * info)
1815{
1816 unsigned long flags;
1817
1818 if (!(info->port.flags & ASYNC_INITIALIZED))
1819 return;
1820
1821 if (debug_level >= DEBUG_LEVEL_INFO)
1822 printk("%s(%d):mgsl_shutdown(%s)\n",
1823 __FILE__,__LINE__, info->device_name );
1824
1825 /* clear status wait queue because status changes */
1826 /* can't happen after shutting down the hardware */
1827 wake_up_interruptible(&info->status_event_wait_q);
1828 wake_up_interruptible(&info->event_wait_q);
1829
1830 del_timer_sync(&info->tx_timer);
1831
1832 if (info->xmit_buf) {
1833 free_page((unsigned long) info->xmit_buf);
1834 info->xmit_buf = NULL;
1835 }
1836
1837 spin_lock_irqsave(&info->irq_spinlock,flags);
1838 usc_DisableMasterIrqBit(info);
1839 usc_stop_receiver(info);
1840 usc_stop_transmitter(info);
1841 usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
1842 TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
1843 usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1844
1845 /* Disable DMAEN (Port 7, Bit 14) */
1846 /* This disconnects the DMA request signal from the ISA bus */
1847 /* on the ISA adapter. This has no effect for the PCI adapter */
1848 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1849
1850 /* Disable INTEN (Port 6, Bit12) */
1851 /* This disconnects the IRQ request signal to the ISA bus */
1852 /* on the ISA adapter. This has no effect for the PCI adapter */
1853 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1854
1855 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
1856 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1857 usc_set_serial_signals(info);
1858 }
1859
1860 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1861
1862 mgsl_release_resources(info);
1863
1864 if (info->port.tty)
1865 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1866
1867 info->port.flags &= ~ASYNC_INITIALIZED;
1868
1869} /* end of shutdown() */
1870
1871static void mgsl_program_hw(struct mgsl_struct *info)
1872{
1873 unsigned long flags;
1874
1875 spin_lock_irqsave(&info->irq_spinlock,flags);
1876
1877 usc_stop_receiver(info);
1878 usc_stop_transmitter(info);
1879 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1880
1881 if (info->params.mode == MGSL_MODE_HDLC ||
1882 info->params.mode == MGSL_MODE_RAW ||
1883 info->netcount)
1884 usc_set_sync_mode(info);
1885 else
1886 usc_set_async_mode(info);
1887
1888 usc_set_serial_signals(info);
1889
1890 info->dcd_chkcount = 0;
1891 info->cts_chkcount = 0;
1892 info->ri_chkcount = 0;
1893 info->dsr_chkcount = 0;
1894
1895 usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
1896 usc_EnableInterrupts(info, IO_PIN);
1897 usc_get_serial_signals(info);
1898
1899 if (info->netcount || info->port.tty->termios->c_cflag & CREAD)
1900 usc_start_receiver(info);
1901
1902 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1903}
1904
1905/* Reconfigure adapter based on new parameters
1906 */
1907static void mgsl_change_params(struct mgsl_struct *info)
1908{
1909 unsigned cflag;
1910 int bits_per_char;
1911
1912 if (!info->port.tty || !info->port.tty->termios)
1913 return;
1914
1915 if (debug_level >= DEBUG_LEVEL_INFO)
1916 printk("%s(%d):mgsl_change_params(%s)\n",
1917 __FILE__,__LINE__, info->device_name );
1918
1919 cflag = info->port.tty->termios->c_cflag;
1920
1921 /* if B0 rate (hangup) specified then negate DTR and RTS */
1922 /* otherwise assert DTR and RTS */
1923 if (cflag & CBAUD)
1924 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1925 else
1926 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1927
1928 /* byte size and parity */
1929
1930 switch (cflag & CSIZE) {
1931 case CS5: info->params.data_bits = 5; break;
1932 case CS6: info->params.data_bits = 6; break;
1933 case CS7: info->params.data_bits = 7; break;
1934 case CS8: info->params.data_bits = 8; break;
1935 /* Never happens, but GCC is too dumb to figure it out */
1936 default: info->params.data_bits = 7; break;
1937 }
1938
1939 if (cflag & CSTOPB)
1940 info->params.stop_bits = 2;
1941 else
1942 info->params.stop_bits = 1;
1943
1944 info->params.parity = ASYNC_PARITY_NONE;
1945 if (cflag & PARENB) {
1946 if (cflag & PARODD)
1947 info->params.parity = ASYNC_PARITY_ODD;
1948 else
1949 info->params.parity = ASYNC_PARITY_EVEN;
1950#ifdef CMSPAR
1951 if (cflag & CMSPAR)
1952 info->params.parity = ASYNC_PARITY_SPACE;
1953#endif
1954 }
1955
1956 /* calculate number of jiffies to transmit a full
1957 * FIFO (32 bytes) at specified data rate
1958 */
1959 bits_per_char = info->params.data_bits +
1960 info->params.stop_bits + 1;
1961
1962 /* if port data rate is set to 460800 or less then
1963 * allow tty settings to override, otherwise keep the
1964 * current data rate.
1965 */
1966 if (info->params.data_rate <= 460800)
1967 info->params.data_rate = tty_get_baud_rate(info->port.tty);
1968
1969 if ( info->params.data_rate ) {
1970 info->timeout = (32*HZ*bits_per_char) /
1971 info->params.data_rate;
1972 }
1973 info->timeout += HZ/50; /* Add .02 seconds of slop */
1974
1975 if (cflag & CRTSCTS)
1976 info->port.flags |= ASYNC_CTS_FLOW;
1977 else
1978 info->port.flags &= ~ASYNC_CTS_FLOW;
1979
1980 if (cflag & CLOCAL)
1981 info->port.flags &= ~ASYNC_CHECK_CD;
1982 else
1983 info->port.flags |= ASYNC_CHECK_CD;
1984
1985 /* process tty input control flags */
1986
1987 info->read_status_mask = RXSTATUS_OVERRUN;
1988 if (I_INPCK(info->port.tty))
1989 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
1990 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
1991 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
1992
1993 if (I_IGNPAR(info->port.tty))
1994 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
1995 if (I_IGNBRK(info->port.tty)) {
1996 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
1997 /* If ignoring parity and break indicators, ignore
1998 * overruns too. (For real raw support).
1999 */
2000 if (I_IGNPAR(info->port.tty))
2001 info->ignore_status_mask |= RXSTATUS_OVERRUN;
2002 }
2003
2004 mgsl_program_hw(info);
2005
2006} /* end of mgsl_change_params() */
2007
2008/* mgsl_put_char()
2009 *
2010 * Add a character to the transmit buffer.
2011 *
2012 * Arguments: tty pointer to tty information structure
2013 * ch character to add to transmit buffer
2014 *
2015 * Return Value: None
2016 */
2017static int mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2018{
2019 struct mgsl_struct *info = tty->driver_data;
2020 unsigned long flags;
2021 int ret = 0;
2022
2023 if (debug_level >= DEBUG_LEVEL_INFO) {
2024 printk(KERN_DEBUG "%s(%d):mgsl_put_char(%d) on %s\n",
2025 __FILE__, __LINE__, ch, info->device_name);
2026 }
2027
2028 if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2029 return 0;
2030
2031 if (!info->xmit_buf)
2032 return 0;
2033
2034 spin_lock_irqsave(&info->irq_spinlock, flags);
2035
2036 if ((info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active) {
2037 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2038 info->xmit_buf[info->xmit_head++] = ch;
2039 info->xmit_head &= SERIAL_XMIT_SIZE-1;
2040 info->xmit_cnt++;
2041 ret = 1;
2042 }
2043 }
2044 spin_unlock_irqrestore(&info->irq_spinlock, flags);
2045 return ret;
2046
2047} /* end of mgsl_put_char() */
2048
2049/* mgsl_flush_chars()
2050 *
2051 * Enable transmitter so remaining characters in the
2052 * transmit buffer are sent.
2053 *
2054 * Arguments: tty pointer to tty information structure
2055 * Return Value: None
2056 */
2057static void mgsl_flush_chars(struct tty_struct *tty)
2058{
2059 struct mgsl_struct *info = tty->driver_data;
2060 unsigned long flags;
2061
2062 if ( debug_level >= DEBUG_LEVEL_INFO )
2063 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2064 __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2065
2066 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2067 return;
2068
2069 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2070 !info->xmit_buf)
2071 return;
2072
2073 if ( debug_level >= DEBUG_LEVEL_INFO )
2074 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2075 __FILE__,__LINE__,info->device_name );
2076
2077 spin_lock_irqsave(&info->irq_spinlock,flags);
2078
2079 if (!info->tx_active) {
2080 if ( (info->params.mode == MGSL_MODE_HDLC ||
2081 info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2082 /* operating in synchronous (frame oriented) mode */
2083 /* copy data from circular xmit_buf to */
2084 /* transmit DMA buffer. */
2085 mgsl_load_tx_dma_buffer(info,
2086 info->xmit_buf,info->xmit_cnt);
2087 }
2088 usc_start_transmitter(info);
2089 }
2090
2091 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2092
2093} /* end of mgsl_flush_chars() */
2094
2095/* mgsl_write()
2096 *
2097 * Send a block of data
2098 *
2099 * Arguments:
2100 *
2101 * tty pointer to tty information structure
2102 * buf pointer to buffer containing send data
2103 * count size of send data in bytes
2104 *
2105 * Return Value: number of characters written
2106 */
2107static int mgsl_write(struct tty_struct * tty,
2108 const unsigned char *buf, int count)
2109{
2110 int c, ret = 0;
2111 struct mgsl_struct *info = tty->driver_data;
2112 unsigned long flags;
2113
2114 if ( debug_level >= DEBUG_LEVEL_INFO )
2115 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2116 __FILE__,__LINE__,info->device_name,count);
2117
2118 if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2119 goto cleanup;
2120
2121 if (!info->xmit_buf)
2122 goto cleanup;
2123
2124 if ( info->params.mode == MGSL_MODE_HDLC ||
2125 info->params.mode == MGSL_MODE_RAW ) {
2126 /* operating in synchronous (frame oriented) mode */
2127 /* operating in synchronous (frame oriented) mode */
2128 if (info->tx_active) {
2129
2130 if ( info->params.mode == MGSL_MODE_HDLC ) {
2131 ret = 0;
2132 goto cleanup;
2133 }
2134 /* transmitter is actively sending data -
2135 * if we have multiple transmit dma and
2136 * holding buffers, attempt to queue this
2137 * frame for transmission at a later time.
2138 */
2139 if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2140 /* no tx holding buffers available */
2141 ret = 0;
2142 goto cleanup;
2143 }
2144
2145 /* queue transmit frame request */
2146 ret = count;
2147 save_tx_buffer_request(info,buf,count);
2148
2149 /* if we have sufficient tx dma buffers,
2150 * load the next buffered tx request
2151 */
2152 spin_lock_irqsave(&info->irq_spinlock,flags);
2153 load_next_tx_holding_buffer(info);
2154 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2155 goto cleanup;
2156 }
2157
2158 /* if operating in HDLC LoopMode and the adapter */
2159 /* has yet to be inserted into the loop, we can't */
2160 /* transmit */
2161
2162 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2163 !usc_loopmode_active(info) )
2164 {
2165 ret = 0;
2166 goto cleanup;
2167 }
2168
2169 if ( info->xmit_cnt ) {
2170 /* Send accumulated from send_char() calls */
2171 /* as frame and wait before accepting more data. */
2172 ret = 0;
2173
2174 /* copy data from circular xmit_buf to */
2175 /* transmit DMA buffer. */
2176 mgsl_load_tx_dma_buffer(info,
2177 info->xmit_buf,info->xmit_cnt);
2178 if ( debug_level >= DEBUG_LEVEL_INFO )
2179 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2180 __FILE__,__LINE__,info->device_name);
2181 } else {
2182 if ( debug_level >= DEBUG_LEVEL_INFO )
2183 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2184 __FILE__,__LINE__,info->device_name);
2185 ret = count;
2186 info->xmit_cnt = count;
2187 mgsl_load_tx_dma_buffer(info,buf,count);
2188 }
2189 } else {
2190 while (1) {
2191 spin_lock_irqsave(&info->irq_spinlock,flags);
2192 c = min_t(int, count,
2193 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2194 SERIAL_XMIT_SIZE - info->xmit_head));
2195 if (c <= 0) {
2196 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2197 break;
2198 }
2199 memcpy(info->xmit_buf + info->xmit_head, buf, c);
2200 info->xmit_head = ((info->xmit_head + c) &
2201 (SERIAL_XMIT_SIZE-1));
2202 info->xmit_cnt += c;
2203 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2204 buf += c;
2205 count -= c;
2206 ret += c;
2207 }
2208 }
2209
2210 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2211 spin_lock_irqsave(&info->irq_spinlock,flags);
2212 if (!info->tx_active)
2213 usc_start_transmitter(info);
2214 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2215 }
2216cleanup:
2217 if ( debug_level >= DEBUG_LEVEL_INFO )
2218 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2219 __FILE__,__LINE__,info->device_name,ret);
2220
2221 return ret;
2222
2223} /* end of mgsl_write() */
2224
2225/* mgsl_write_room()
2226 *
2227 * Return the count of free bytes in transmit buffer
2228 *
2229 * Arguments: tty pointer to tty info structure
2230 * Return Value: None
2231 */
2232static int mgsl_write_room(struct tty_struct *tty)
2233{
2234 struct mgsl_struct *info = tty->driver_data;
2235 int ret;
2236
2237 if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2238 return 0;
2239 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2240 if (ret < 0)
2241 ret = 0;
2242
2243 if (debug_level >= DEBUG_LEVEL_INFO)
2244 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2245 __FILE__,__LINE__, info->device_name,ret );
2246
2247 if ( info->params.mode == MGSL_MODE_HDLC ||
2248 info->params.mode == MGSL_MODE_RAW ) {
2249 /* operating in synchronous (frame oriented) mode */
2250 if ( info->tx_active )
2251 return 0;
2252 else
2253 return HDLC_MAX_FRAME_SIZE;
2254 }
2255
2256 return ret;
2257
2258} /* end of mgsl_write_room() */
2259
2260/* mgsl_chars_in_buffer()
2261 *
2262 * Return the count of bytes in transmit buffer
2263 *
2264 * Arguments: tty pointer to tty info structure
2265 * Return Value: None
2266 */
2267static int mgsl_chars_in_buffer(struct tty_struct *tty)
2268{
2269 struct mgsl_struct *info = tty->driver_data;
2270
2271 if (debug_level >= DEBUG_LEVEL_INFO)
2272 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2273 __FILE__,__LINE__, info->device_name );
2274
2275 if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2276 return 0;
2277
2278 if (debug_level >= DEBUG_LEVEL_INFO)
2279 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2280 __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2281
2282 if ( info->params.mode == MGSL_MODE_HDLC ||
2283 info->params.mode == MGSL_MODE_RAW ) {
2284 /* operating in synchronous (frame oriented) mode */
2285 if ( info->tx_active )
2286 return info->max_frame_size;
2287 else
2288 return 0;
2289 }
2290
2291 return info->xmit_cnt;
2292} /* end of mgsl_chars_in_buffer() */
2293
2294/* mgsl_flush_buffer()
2295 *
2296 * Discard all data in the send buffer
2297 *
2298 * Arguments: tty pointer to tty info structure
2299 * Return Value: None
2300 */
2301static void mgsl_flush_buffer(struct tty_struct *tty)
2302{
2303 struct mgsl_struct *info = tty->driver_data;
2304 unsigned long flags;
2305
2306 if (debug_level >= DEBUG_LEVEL_INFO)
2307 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2308 __FILE__,__LINE__, info->device_name );
2309
2310 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2311 return;
2312
2313 spin_lock_irqsave(&info->irq_spinlock,flags);
2314 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2315 del_timer(&info->tx_timer);
2316 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2317
2318 tty_wakeup(tty);
2319}
2320
2321/* mgsl_send_xchar()
2322 *
2323 * Send a high-priority XON/XOFF character
2324 *
2325 * Arguments: tty pointer to tty info structure
2326 * ch character to send
2327 * Return Value: None
2328 */
2329static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2330{
2331 struct mgsl_struct *info = tty->driver_data;
2332 unsigned long flags;
2333
2334 if (debug_level >= DEBUG_LEVEL_INFO)
2335 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2336 __FILE__,__LINE__, info->device_name, ch );
2337
2338 if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2339 return;
2340
2341 info->x_char = ch;
2342 if (ch) {
2343 /* Make sure transmit interrupts are on */
2344 spin_lock_irqsave(&info->irq_spinlock,flags);
2345 if (!info->tx_enabled)
2346 usc_start_transmitter(info);
2347 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2348 }
2349} /* end of mgsl_send_xchar() */
2350
2351/* mgsl_throttle()
2352 *
2353 * Signal remote device to throttle send data (our receive data)
2354 *
2355 * Arguments: tty pointer to tty info structure
2356 * Return Value: None
2357 */
2358static void mgsl_throttle(struct tty_struct * tty)
2359{
2360 struct mgsl_struct *info = tty->driver_data;
2361 unsigned long flags;
2362
2363 if (debug_level >= DEBUG_LEVEL_INFO)
2364 printk("%s(%d):mgsl_throttle(%s) entry\n",
2365 __FILE__,__LINE__, info->device_name );
2366
2367 if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2368 return;
2369
2370 if (I_IXOFF(tty))
2371 mgsl_send_xchar(tty, STOP_CHAR(tty));
2372
2373 if (tty->termios->c_cflag & CRTSCTS) {
2374 spin_lock_irqsave(&info->irq_spinlock,flags);
2375 info->serial_signals &= ~SerialSignal_RTS;
2376 usc_set_serial_signals(info);
2377 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2378 }
2379} /* end of mgsl_throttle() */
2380
2381/* mgsl_unthrottle()
2382 *
2383 * Signal remote device to stop throttling send data (our receive data)
2384 *
2385 * Arguments: tty pointer to tty info structure
2386 * Return Value: None
2387 */
2388static void mgsl_unthrottle(struct tty_struct * tty)
2389{
2390 struct mgsl_struct *info = tty->driver_data;
2391 unsigned long flags;
2392
2393 if (debug_level >= DEBUG_LEVEL_INFO)
2394 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2395 __FILE__,__LINE__, info->device_name );
2396
2397 if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2398 return;
2399
2400 if (I_IXOFF(tty)) {
2401 if (info->x_char)
2402 info->x_char = 0;
2403 else
2404 mgsl_send_xchar(tty, START_CHAR(tty));
2405 }
2406
2407 if (tty->termios->c_cflag & CRTSCTS) {
2408 spin_lock_irqsave(&info->irq_spinlock,flags);
2409 info->serial_signals |= SerialSignal_RTS;
2410 usc_set_serial_signals(info);
2411 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2412 }
2413
2414} /* end of mgsl_unthrottle() */
2415
2416/* mgsl_get_stats()
2417 *
2418 * get the current serial parameters information
2419 *
2420 * Arguments: info pointer to device instance data
2421 * user_icount pointer to buffer to hold returned stats
2422 *
2423 * Return Value: 0 if success, otherwise error code
2424 */
2425static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2426{
2427 int err;
2428
2429 if (debug_level >= DEBUG_LEVEL_INFO)
2430 printk("%s(%d):mgsl_get_params(%s)\n",
2431 __FILE__,__LINE__, info->device_name);
2432
2433 if (!user_icount) {
2434 memset(&info->icount, 0, sizeof(info->icount));
2435 } else {
2436 mutex_lock(&info->port.mutex);
2437 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2438 mutex_unlock(&info->port.mutex);
2439 if (err)
2440 return -EFAULT;
2441 }
2442
2443 return 0;
2444
2445} /* end of mgsl_get_stats() */
2446
2447/* mgsl_get_params()
2448 *
2449 * get the current serial parameters information
2450 *
2451 * Arguments: info pointer to device instance data
2452 * user_params pointer to buffer to hold returned params
2453 *
2454 * Return Value: 0 if success, otherwise error code
2455 */
2456static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2457{
2458 int err;
2459 if (debug_level >= DEBUG_LEVEL_INFO)
2460 printk("%s(%d):mgsl_get_params(%s)\n",
2461 __FILE__,__LINE__, info->device_name);
2462
2463 mutex_lock(&info->port.mutex);
2464 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2465 mutex_unlock(&info->port.mutex);
2466 if (err) {
2467 if ( debug_level >= DEBUG_LEVEL_INFO )
2468 printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2469 __FILE__,__LINE__,info->device_name);
2470 return -EFAULT;
2471 }
2472
2473 return 0;
2474
2475} /* end of mgsl_get_params() */
2476
2477/* mgsl_set_params()
2478 *
2479 * set the serial parameters
2480 *
2481 * Arguments:
2482 *
2483 * info pointer to device instance data
2484 * new_params user buffer containing new serial params
2485 *
2486 * Return Value: 0 if success, otherwise error code
2487 */
2488static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2489{
2490 unsigned long flags;
2491 MGSL_PARAMS tmp_params;
2492 int err;
2493
2494 if (debug_level >= DEBUG_LEVEL_INFO)
2495 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2496 info->device_name );
2497 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2498 if (err) {
2499 if ( debug_level >= DEBUG_LEVEL_INFO )
2500 printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2501 __FILE__,__LINE__,info->device_name);
2502 return -EFAULT;
2503 }
2504
2505 mutex_lock(&info->port.mutex);
2506 spin_lock_irqsave(&info->irq_spinlock,flags);
2507 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2508 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2509
2510 mgsl_change_params(info);
2511 mutex_unlock(&info->port.mutex);
2512
2513 return 0;
2514
2515} /* end of mgsl_set_params() */
2516
2517/* mgsl_get_txidle()
2518 *
2519 * get the current transmit idle mode
2520 *
2521 * Arguments: info pointer to device instance data
2522 * idle_mode pointer to buffer to hold returned idle mode
2523 *
2524 * Return Value: 0 if success, otherwise error code
2525 */
2526static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2527{
2528 int err;
2529
2530 if (debug_level >= DEBUG_LEVEL_INFO)
2531 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2532 __FILE__,__LINE__, info->device_name, info->idle_mode);
2533
2534 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2535 if (err) {
2536 if ( debug_level >= DEBUG_LEVEL_INFO )
2537 printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2538 __FILE__,__LINE__,info->device_name);
2539 return -EFAULT;
2540 }
2541
2542 return 0;
2543
2544} /* end of mgsl_get_txidle() */
2545
2546/* mgsl_set_txidle() service ioctl to set transmit idle mode
2547 *
2548 * Arguments: info pointer to device instance data
2549 * idle_mode new idle mode
2550 *
2551 * Return Value: 0 if success, otherwise error code
2552 */
2553static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2554{
2555 unsigned long flags;
2556
2557 if (debug_level >= DEBUG_LEVEL_INFO)
2558 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2559 info->device_name, idle_mode );
2560
2561 spin_lock_irqsave(&info->irq_spinlock,flags);
2562 info->idle_mode = idle_mode;
2563 usc_set_txidle( info );
2564 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2565 return 0;
2566
2567} /* end of mgsl_set_txidle() */
2568
2569/* mgsl_txenable()
2570 *
2571 * enable or disable the transmitter
2572 *
2573 * Arguments:
2574 *
2575 * info pointer to device instance data
2576 * enable 1 = enable, 0 = disable
2577 *
2578 * Return Value: 0 if success, otherwise error code
2579 */
2580static int mgsl_txenable(struct mgsl_struct * info, int enable)
2581{
2582 unsigned long flags;
2583
2584 if (debug_level >= DEBUG_LEVEL_INFO)
2585 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2586 info->device_name, enable);
2587
2588 spin_lock_irqsave(&info->irq_spinlock,flags);
2589 if ( enable ) {
2590 if ( !info->tx_enabled ) {
2591
2592 usc_start_transmitter(info);
2593 /*--------------------------------------------------
2594 * if HDLC/SDLC Loop mode, attempt to insert the
2595 * station in the 'loop' by setting CMR:13. Upon
2596 * receipt of the next GoAhead (RxAbort) sequence,
2597 * the OnLoop indicator (CCSR:7) should go active
2598 * to indicate that we are on the loop
2599 *--------------------------------------------------*/
2600 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2601 usc_loopmode_insert_request( info );
2602 }
2603 } else {
2604 if ( info->tx_enabled )
2605 usc_stop_transmitter(info);
2606 }
2607 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2608 return 0;
2609
2610} /* end of mgsl_txenable() */
2611
2612/* mgsl_txabort() abort send HDLC frame
2613 *
2614 * Arguments: info pointer to device instance data
2615 * Return Value: 0 if success, otherwise error code
2616 */
2617static int mgsl_txabort(struct mgsl_struct * info)
2618{
2619 unsigned long flags;
2620
2621 if (debug_level >= DEBUG_LEVEL_INFO)
2622 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2623 info->device_name);
2624
2625 spin_lock_irqsave(&info->irq_spinlock,flags);
2626 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2627 {
2628 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2629 usc_loopmode_cancel_transmit( info );
2630 else
2631 usc_TCmd(info,TCmd_SendAbort);
2632 }
2633 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2634 return 0;
2635
2636} /* end of mgsl_txabort() */
2637
2638/* mgsl_rxenable() enable or disable the receiver
2639 *
2640 * Arguments: info pointer to device instance data
2641 * enable 1 = enable, 0 = disable
2642 * Return Value: 0 if success, otherwise error code
2643 */
2644static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2645{
2646 unsigned long flags;
2647
2648 if (debug_level >= DEBUG_LEVEL_INFO)
2649 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2650 info->device_name, enable);
2651
2652 spin_lock_irqsave(&info->irq_spinlock,flags);
2653 if ( enable ) {
2654 if ( !info->rx_enabled )
2655 usc_start_receiver(info);
2656 } else {
2657 if ( info->rx_enabled )
2658 usc_stop_receiver(info);
2659 }
2660 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2661 return 0;
2662
2663} /* end of mgsl_rxenable() */
2664
2665/* mgsl_wait_event() wait for specified event to occur
2666 *
2667 * Arguments: info pointer to device instance data
2668 * mask pointer to bitmask of events to wait for
2669 * Return Value: 0 if successful and bit mask updated with
2670 * of events triggerred,
2671 * otherwise error code
2672 */
2673static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2674{
2675 unsigned long flags;
2676 int s;
2677 int rc=0;
2678 struct mgsl_icount cprev, cnow;
2679 int events;
2680 int mask;
2681 struct _input_signal_events oldsigs, newsigs;
2682 DECLARE_WAITQUEUE(wait, current);
2683
2684 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2685 if (rc) {
2686 return -EFAULT;
2687 }
2688
2689 if (debug_level >= DEBUG_LEVEL_INFO)
2690 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2691 info->device_name, mask);
2692
2693 spin_lock_irqsave(&info->irq_spinlock,flags);
2694
2695 /* return immediately if state matches requested events */
2696 usc_get_serial_signals(info);
2697 s = info->serial_signals;
2698 events = mask &
2699 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2700 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2701 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2702 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2703 if (events) {
2704 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2705 goto exit;
2706 }
2707
2708 /* save current irq counts */
2709 cprev = info->icount;
2710 oldsigs = info->input_signal_events;
2711
2712 /* enable hunt and idle irqs if needed */
2713 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2714 u16 oldreg = usc_InReg(info,RICR);
2715 u16 newreg = oldreg +
2716 (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2717 (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2718 if (oldreg != newreg)
2719 usc_OutReg(info, RICR, newreg);
2720 }
2721
2722 set_current_state(TASK_INTERRUPTIBLE);
2723 add_wait_queue(&info->event_wait_q, &wait);
2724
2725 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2726
2727
2728 for(;;) {
2729 schedule();
2730 if (signal_pending(current)) {
2731 rc = -ERESTARTSYS;
2732 break;
2733 }
2734
2735 /* get current irq counts */
2736 spin_lock_irqsave(&info->irq_spinlock,flags);
2737 cnow = info->icount;
2738 newsigs = info->input_signal_events;
2739 set_current_state(TASK_INTERRUPTIBLE);
2740 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2741
2742 /* if no change, wait aborted for some reason */
2743 if (newsigs.dsr_up == oldsigs.dsr_up &&
2744 newsigs.dsr_down == oldsigs.dsr_down &&
2745 newsigs.dcd_up == oldsigs.dcd_up &&
2746 newsigs.dcd_down == oldsigs.dcd_down &&
2747 newsigs.cts_up == oldsigs.cts_up &&
2748 newsigs.cts_down == oldsigs.cts_down &&
2749 newsigs.ri_up == oldsigs.ri_up &&
2750 newsigs.ri_down == oldsigs.ri_down &&
2751 cnow.exithunt == cprev.exithunt &&
2752 cnow.rxidle == cprev.rxidle) {
2753 rc = -EIO;
2754 break;
2755 }
2756
2757 events = mask &
2758 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2759 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2760 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2761 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2762 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2763 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2764 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2765 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2766 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2767 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2768 if (events)
2769 break;
2770
2771 cprev = cnow;
2772 oldsigs = newsigs;
2773 }
2774
2775 remove_wait_queue(&info->event_wait_q, &wait);
2776 set_current_state(TASK_RUNNING);
2777
2778 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2779 spin_lock_irqsave(&info->irq_spinlock,flags);
2780 if (!waitqueue_active(&info->event_wait_q)) {
2781 /* disable enable exit hunt mode/idle rcvd IRQs */
2782 usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2783 ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
2784 }
2785 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2786 }
2787exit:
2788 if ( rc == 0 )
2789 PUT_USER(rc, events, mask_ptr);
2790
2791 return rc;
2792
2793} /* end of mgsl_wait_event() */
2794
2795static int modem_input_wait(struct mgsl_struct *info,int arg)
2796{
2797 unsigned long flags;
2798 int rc;
2799 struct mgsl_icount cprev, cnow;
2800 DECLARE_WAITQUEUE(wait, current);
2801
2802 /* save current irq counts */
2803 spin_lock_irqsave(&info->irq_spinlock,flags);
2804 cprev = info->icount;
2805 add_wait_queue(&info->status_event_wait_q, &wait);
2806 set_current_state(TASK_INTERRUPTIBLE);
2807 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2808
2809 for(;;) {
2810 schedule();
2811 if (signal_pending(current)) {
2812 rc = -ERESTARTSYS;
2813 break;
2814 }
2815
2816 /* get new irq counts */
2817 spin_lock_irqsave(&info->irq_spinlock,flags);
2818 cnow = info->icount;
2819 set_current_state(TASK_INTERRUPTIBLE);
2820 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2821
2822 /* if no change, wait aborted for some reason */
2823 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2824 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2825 rc = -EIO;
2826 break;
2827 }
2828
2829 /* check for change in caller specified modem input */
2830 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2831 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2832 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2833 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2834 rc = 0;
2835 break;
2836 }
2837
2838 cprev = cnow;
2839 }
2840 remove_wait_queue(&info->status_event_wait_q, &wait);
2841 set_current_state(TASK_RUNNING);
2842 return rc;
2843}
2844
2845/* return the state of the serial control and status signals
2846 */
2847static int tiocmget(struct tty_struct *tty)
2848{
2849 struct mgsl_struct *info = tty->driver_data;
2850 unsigned int result;
2851 unsigned long flags;
2852
2853 spin_lock_irqsave(&info->irq_spinlock,flags);
2854 usc_get_serial_signals(info);
2855 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2856
2857 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2858 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2859 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2860 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2861 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2862 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2863
2864 if (debug_level >= DEBUG_LEVEL_INFO)
2865 printk("%s(%d):%s tiocmget() value=%08X\n",
2866 __FILE__,__LINE__, info->device_name, result );
2867 return result;
2868}
2869
2870/* set modem control signals (DTR/RTS)
2871 */
2872static int tiocmset(struct tty_struct *tty,
2873 unsigned int set, unsigned int clear)
2874{
2875 struct mgsl_struct *info = tty->driver_data;
2876 unsigned long flags;
2877
2878 if (debug_level >= DEBUG_LEVEL_INFO)
2879 printk("%s(%d):%s tiocmset(%x,%x)\n",
2880 __FILE__,__LINE__,info->device_name, set, clear);
2881
2882 if (set & TIOCM_RTS)
2883 info->serial_signals |= SerialSignal_RTS;
2884 if (set & TIOCM_DTR)
2885 info->serial_signals |= SerialSignal_DTR;
2886 if (clear & TIOCM_RTS)
2887 info->serial_signals &= ~SerialSignal_RTS;
2888 if (clear & TIOCM_DTR)
2889 info->serial_signals &= ~SerialSignal_DTR;
2890
2891 spin_lock_irqsave(&info->irq_spinlock,flags);
2892 usc_set_serial_signals(info);
2893 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2894
2895 return 0;
2896}
2897
2898/* mgsl_break() Set or clear transmit break condition
2899 *
2900 * Arguments: tty pointer to tty instance data
2901 * break_state -1=set break condition, 0=clear
2902 * Return Value: error code
2903 */
2904static int mgsl_break(struct tty_struct *tty, int break_state)
2905{
2906 struct mgsl_struct * info = tty->driver_data;
2907 unsigned long flags;
2908
2909 if (debug_level >= DEBUG_LEVEL_INFO)
2910 printk("%s(%d):mgsl_break(%s,%d)\n",
2911 __FILE__,__LINE__, info->device_name, break_state);
2912
2913 if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2914 return -EINVAL;
2915
2916 spin_lock_irqsave(&info->irq_spinlock,flags);
2917 if (break_state == -1)
2918 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2919 else
2920 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2921 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2922 return 0;
2923
2924} /* end of mgsl_break() */
2925
2926/*
2927 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
2928 * Return: write counters to the user passed counter struct
2929 * NB: both 1->0 and 0->1 transitions are counted except for
2930 * RI where only 0->1 is counted.
2931 */
2932static int msgl_get_icount(struct tty_struct *tty,
2933 struct serial_icounter_struct *icount)
2934
2935{
2936 struct mgsl_struct * info = tty->driver_data;
2937 struct mgsl_icount cnow; /* kernel counter temps */
2938 unsigned long flags;
2939
2940 spin_lock_irqsave(&info->irq_spinlock,flags);
2941 cnow = info->icount;
2942 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2943
2944 icount->cts = cnow.cts;
2945 icount->dsr = cnow.dsr;
2946 icount->rng = cnow.rng;
2947 icount->dcd = cnow.dcd;
2948 icount->rx = cnow.rx;
2949 icount->tx = cnow.tx;
2950 icount->frame = cnow.frame;
2951 icount->overrun = cnow.overrun;
2952 icount->parity = cnow.parity;
2953 icount->brk = cnow.brk;
2954 icount->buf_overrun = cnow.buf_overrun;
2955 return 0;
2956}
2957
2958/* mgsl_ioctl() Service an IOCTL request
2959 *
2960 * Arguments:
2961 *
2962 * tty pointer to tty instance data
2963 * cmd IOCTL command code
2964 * arg command argument/context
2965 *
2966 * Return Value: 0 if success, otherwise error code
2967 */
2968static int mgsl_ioctl(struct tty_struct *tty,
2969 unsigned int cmd, unsigned long arg)
2970{
2971 struct mgsl_struct * info = tty->driver_data;
2972
2973 if (debug_level >= DEBUG_LEVEL_INFO)
2974 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2975 info->device_name, cmd );
2976
2977 if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2978 return -ENODEV;
2979
2980 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2981 (cmd != TIOCMIWAIT)) {
2982 if (tty->flags & (1 << TTY_IO_ERROR))
2983 return -EIO;
2984 }
2985
2986 return mgsl_ioctl_common(info, cmd, arg);
2987}
2988
2989static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2990{
2991 void __user *argp = (void __user *)arg;
2992
2993 switch (cmd) {
2994 case MGSL_IOCGPARAMS:
2995 return mgsl_get_params(info, argp);
2996 case MGSL_IOCSPARAMS:
2997 return mgsl_set_params(info, argp);
2998 case MGSL_IOCGTXIDLE:
2999 return mgsl_get_txidle(info, argp);
3000 case MGSL_IOCSTXIDLE:
3001 return mgsl_set_txidle(info,(int)arg);
3002 case MGSL_IOCTXENABLE:
3003 return mgsl_txenable(info,(int)arg);
3004 case MGSL_IOCRXENABLE:
3005 return mgsl_rxenable(info,(int)arg);
3006 case MGSL_IOCTXABORT:
3007 return mgsl_txabort(info);
3008 case MGSL_IOCGSTATS:
3009 return mgsl_get_stats(info, argp);
3010 case MGSL_IOCWAITEVENT:
3011 return mgsl_wait_event(info, argp);
3012 case MGSL_IOCLOOPTXDONE:
3013 return mgsl_loopmode_send_done(info);
3014 /* Wait for modem input (DCD,RI,DSR,CTS) change
3015 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
3016 */
3017 case TIOCMIWAIT:
3018 return modem_input_wait(info,(int)arg);
3019
3020 default:
3021 return -ENOIOCTLCMD;
3022 }
3023 return 0;
3024}
3025
3026/* mgsl_set_termios()
3027 *
3028 * Set new termios settings
3029 *
3030 * Arguments:
3031 *
3032 * tty pointer to tty structure
3033 * termios pointer to buffer to hold returned old termios
3034 *
3035 * Return Value: None
3036 */
3037static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3038{
3039 struct mgsl_struct *info = tty->driver_data;
3040 unsigned long flags;
3041
3042 if (debug_level >= DEBUG_LEVEL_INFO)
3043 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3044 tty->driver->name );
3045
3046 mgsl_change_params(info);
3047
3048 /* Handle transition to B0 status */
3049 if (old_termios->c_cflag & CBAUD &&
3050 !(tty->termios->c_cflag & CBAUD)) {
3051 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3052 spin_lock_irqsave(&info->irq_spinlock,flags);
3053 usc_set_serial_signals(info);
3054 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3055 }
3056
3057 /* Handle transition away from B0 status */
3058 if (!(old_termios->c_cflag & CBAUD) &&
3059 tty->termios->c_cflag & CBAUD) {
3060 info->serial_signals |= SerialSignal_DTR;
3061 if (!(tty->termios->c_cflag & CRTSCTS) ||
3062 !test_bit(TTY_THROTTLED, &tty->flags)) {
3063 info->serial_signals |= SerialSignal_RTS;
3064 }
3065 spin_lock_irqsave(&info->irq_spinlock,flags);
3066 usc_set_serial_signals(info);
3067 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3068 }
3069
3070 /* Handle turning off CRTSCTS */
3071 if (old_termios->c_cflag & CRTSCTS &&
3072 !(tty->termios->c_cflag & CRTSCTS)) {
3073 tty->hw_stopped = 0;
3074 mgsl_start(tty);
3075 }
3076
3077} /* end of mgsl_set_termios() */
3078
3079/* mgsl_close()
3080 *
3081 * Called when port is closed. Wait for remaining data to be
3082 * sent. Disable port and free resources.
3083 *
3084 * Arguments:
3085 *
3086 * tty pointer to open tty structure
3087 * filp pointer to open file object
3088 *
3089 * Return Value: None
3090 */
3091static void mgsl_close(struct tty_struct *tty, struct file * filp)
3092{
3093 struct mgsl_struct * info = tty->driver_data;
3094
3095 if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
3096 return;
3097
3098 if (debug_level >= DEBUG_LEVEL_INFO)
3099 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
3100 __FILE__,__LINE__, info->device_name, info->port.count);
3101
3102 if (tty_port_close_start(&info->port, tty, filp) == 0)
3103 goto cleanup;
3104
3105 mutex_lock(&info->port.mutex);
3106 if (info->port.flags & ASYNC_INITIALIZED)
3107 mgsl_wait_until_sent(tty, info->timeout);
3108 mgsl_flush_buffer(tty);
3109 tty_ldisc_flush(tty);
3110 shutdown(info);
3111 mutex_unlock(&info->port.mutex);
3112
3113 tty_port_close_end(&info->port, tty);
3114 info->port.tty = NULL;
3115cleanup:
3116 if (debug_level >= DEBUG_LEVEL_INFO)
3117 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
3118 tty->driver->name, info->port.count);
3119
3120} /* end of mgsl_close() */
3121
3122/* mgsl_wait_until_sent()
3123 *
3124 * Wait until the transmitter is empty.
3125 *
3126 * Arguments:
3127 *
3128 * tty pointer to tty info structure
3129 * timeout time to wait for send completion
3130 *
3131 * Return Value: None
3132 */
3133static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
3134{
3135 struct mgsl_struct * info = tty->driver_data;
3136 unsigned long orig_jiffies, char_time;
3137
3138 if (!info )
3139 return;
3140
3141 if (debug_level >= DEBUG_LEVEL_INFO)
3142 printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
3143 __FILE__,__LINE__, info->device_name );
3144
3145 if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
3146 return;
3147
3148 if (!(info->port.flags & ASYNC_INITIALIZED))
3149 goto exit;
3150
3151 orig_jiffies = jiffies;
3152
3153 /* Set check interval to 1/5 of estimated time to
3154 * send a character, and make it at least 1. The check
3155 * interval should also be less than the timeout.
3156 * Note: use tight timings here to satisfy the NIST-PCTS.
3157 */
3158
3159 if ( info->params.data_rate ) {
3160 char_time = info->timeout/(32 * 5);
3161 if (!char_time)
3162 char_time++;
3163 } else
3164 char_time = 1;
3165
3166 if (timeout)
3167 char_time = min_t(unsigned long, char_time, timeout);
3168
3169 if ( info->params.mode == MGSL_MODE_HDLC ||
3170 info->params.mode == MGSL_MODE_RAW ) {
3171 while (info->tx_active) {
3172 msleep_interruptible(jiffies_to_msecs(char_time));
3173 if (signal_pending(current))
3174 break;
3175 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3176 break;
3177 }
3178 } else {
3179 while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
3180 info->tx_enabled) {
3181 msleep_interruptible(jiffies_to_msecs(char_time));
3182 if (signal_pending(current))
3183 break;
3184 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3185 break;
3186 }
3187 }
3188
3189exit:
3190 if (debug_level >= DEBUG_LEVEL_INFO)
3191 printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
3192 __FILE__,__LINE__, info->device_name );
3193
3194} /* end of mgsl_wait_until_sent() */
3195
3196/* mgsl_hangup()
3197 *
3198 * Called by tty_hangup() when a hangup is signaled.
3199 * This is the same as to closing all open files for the port.
3200 *
3201 * Arguments: tty pointer to associated tty object
3202 * Return Value: None
3203 */
3204static void mgsl_hangup(struct tty_struct *tty)
3205{
3206 struct mgsl_struct * info = tty->driver_data;
3207
3208 if (debug_level >= DEBUG_LEVEL_INFO)
3209 printk("%s(%d):mgsl_hangup(%s)\n",
3210 __FILE__,__LINE__, info->device_name );
3211
3212 if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
3213 return;
3214
3215 mgsl_flush_buffer(tty);
3216 shutdown(info);
3217
3218 info->port.count = 0;
3219 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
3220 info->port.tty = NULL;
3221
3222 wake_up_interruptible(&info->port.open_wait);
3223
3224} /* end of mgsl_hangup() */
3225
3226/*
3227 * carrier_raised()
3228 *
3229 * Return true if carrier is raised
3230 */
3231
3232static int carrier_raised(struct tty_port *port)
3233{
3234 unsigned long flags;
3235 struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
3236
3237 spin_lock_irqsave(&info->irq_spinlock, flags);
3238 usc_get_serial_signals(info);
3239 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3240 return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3241}
3242
3243static void dtr_rts(struct tty_port *port, int on)
3244{
3245 struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
3246 unsigned long flags;
3247
3248 spin_lock_irqsave(&info->irq_spinlock,flags);
3249 if (on)
3250 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3251 else
3252 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3253 usc_set_serial_signals(info);
3254 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3255}
3256
3257
3258/* block_til_ready()
3259 *
3260 * Block the current process until the specified port
3261 * is ready to be opened.
3262 *
3263 * Arguments:
3264 *
3265 * tty pointer to tty info structure
3266 * filp pointer to open file object
3267 * info pointer to device instance data
3268 *
3269 * Return Value: 0 if success, otherwise error code
3270 */
3271static int block_til_ready(struct tty_struct *tty, struct file * filp,
3272 struct mgsl_struct *info)
3273{
3274 DECLARE_WAITQUEUE(wait, current);
3275 int retval;
3276 bool do_clocal = false;
3277 bool extra_count = false;
3278 unsigned long flags;
3279 int dcd;
3280 struct tty_port *port = &info->port;
3281
3282 if (debug_level >= DEBUG_LEVEL_INFO)
3283 printk("%s(%d):block_til_ready on %s\n",
3284 __FILE__,__LINE__, tty->driver->name );
3285
3286 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3287 /* nonblock mode is set or port is not enabled */
3288 port->flags |= ASYNC_NORMAL_ACTIVE;
3289 return 0;
3290 }
3291
3292 if (tty->termios->c_cflag & CLOCAL)
3293 do_clocal = true;
3294
3295 /* Wait for carrier detect and the line to become
3296 * free (i.e., not in use by the callout). While we are in
3297 * this loop, port->count is dropped by one, so that
3298 * mgsl_close() knows when to free things. We restore it upon
3299 * exit, either normal or abnormal.
3300 */
3301
3302 retval = 0;
3303 add_wait_queue(&port->open_wait, &wait);
3304
3305 if (debug_level >= DEBUG_LEVEL_INFO)
3306 printk("%s(%d):block_til_ready before block on %s count=%d\n",
3307 __FILE__,__LINE__, tty->driver->name, port->count );
3308
3309 spin_lock_irqsave(&info->irq_spinlock, flags);
3310 if (!tty_hung_up_p(filp)) {
3311 extra_count = true;
3312 port->count--;
3313 }
3314 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3315 port->blocked_open++;
3316
3317 while (1) {
3318 if (tty->termios->c_cflag & CBAUD)
3319 tty_port_raise_dtr_rts(port);
3320
3321 set_current_state(TASK_INTERRUPTIBLE);
3322
3323 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3324 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3325 -EAGAIN : -ERESTARTSYS;
3326 break;
3327 }
3328
3329 dcd = tty_port_carrier_raised(&info->port);
3330
3331 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || dcd))
3332 break;
3333
3334 if (signal_pending(current)) {
3335 retval = -ERESTARTSYS;
3336 break;
3337 }
3338
3339 if (debug_level >= DEBUG_LEVEL_INFO)
3340 printk("%s(%d):block_til_ready blocking on %s count=%d\n",
3341 __FILE__,__LINE__, tty->driver->name, port->count );
3342
3343 tty_unlock();
3344 schedule();
3345 tty_lock();
3346 }
3347
3348 set_current_state(TASK_RUNNING);
3349 remove_wait_queue(&port->open_wait, &wait);
3350
3351 /* FIXME: Racy on hangup during close wait */
3352 if (extra_count)
3353 port->count++;
3354 port->blocked_open--;
3355
3356 if (debug_level >= DEBUG_LEVEL_INFO)
3357 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
3358 __FILE__,__LINE__, tty->driver->name, port->count );
3359
3360 if (!retval)
3361 port->flags |= ASYNC_NORMAL_ACTIVE;
3362
3363 return retval;
3364
3365} /* end of block_til_ready() */
3366
3367/* mgsl_open()
3368 *
3369 * Called when a port is opened. Init and enable port.
3370 * Perform serial-specific initialization for the tty structure.
3371 *
3372 * Arguments: tty pointer to tty info structure
3373 * filp associated file pointer
3374 *
3375 * Return Value: 0 if success, otherwise error code
3376 */
3377static int mgsl_open(struct tty_struct *tty, struct file * filp)
3378{
3379 struct mgsl_struct *info;
3380 int retval, line;
3381 unsigned long flags;
3382
3383 /* verify range of specified line number */
3384 line = tty->index;
3385 if ((line < 0) || (line >= mgsl_device_count)) {
3386 printk("%s(%d):mgsl_open with invalid line #%d.\n",
3387 __FILE__,__LINE__,line);
3388 return -ENODEV;
3389 }
3390
3391 /* find the info structure for the specified line */
3392 info = mgsl_device_list;
3393 while(info && info->line != line)
3394 info = info->next_device;
3395 if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
3396 return -ENODEV;
3397
3398 tty->driver_data = info;
3399 info->port.tty = tty;
3400
3401 if (debug_level >= DEBUG_LEVEL_INFO)
3402 printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
3403 __FILE__,__LINE__,tty->driver->name, info->port.count);
3404
3405 /* If port is closing, signal caller to try again */
3406 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
3407 if (info->port.flags & ASYNC_CLOSING)
3408 interruptible_sleep_on(&info->port.close_wait);
3409 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
3410 -EAGAIN : -ERESTARTSYS);
3411 goto cleanup;
3412 }
3413
3414 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3415
3416 spin_lock_irqsave(&info->netlock, flags);
3417 if (info->netcount) {
3418 retval = -EBUSY;
3419 spin_unlock_irqrestore(&info->netlock, flags);
3420 goto cleanup;
3421 }
3422 info->port.count++;
3423 spin_unlock_irqrestore(&info->netlock, flags);
3424
3425 if (info->port.count == 1) {
3426 /* 1st open on this device, init hardware */
3427 retval = startup(info);
3428 if (retval < 0)
3429 goto cleanup;
3430 }
3431
3432 retval = block_til_ready(tty, filp, info);
3433 if (retval) {
3434 if (debug_level >= DEBUG_LEVEL_INFO)
3435 printk("%s(%d):block_til_ready(%s) returned %d\n",
3436 __FILE__,__LINE__, info->device_name, retval);
3437 goto cleanup;
3438 }
3439
3440 if (debug_level >= DEBUG_LEVEL_INFO)
3441 printk("%s(%d):mgsl_open(%s) success\n",
3442 __FILE__,__LINE__, info->device_name);
3443 retval = 0;
3444
3445cleanup:
3446 if (retval) {
3447 if (tty->count == 1)
3448 info->port.tty = NULL; /* tty layer will release tty struct */
3449 if(info->port.count)
3450 info->port.count--;
3451 }
3452
3453 return retval;
3454
3455} /* end of mgsl_open() */
3456
3457/*
3458 * /proc fs routines....
3459 */
3460
3461static inline void line_info(struct seq_file *m, struct mgsl_struct *info)
3462{
3463 char stat_buf[30];
3464 unsigned long flags;
3465
3466 if (info->bus_type == MGSL_BUS_TYPE_PCI) {
3467 seq_printf(m, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
3468 info->device_name, info->io_base, info->irq_level,
3469 info->phys_memory_base, info->phys_lcr_base);
3470 } else {
3471 seq_printf(m, "%s:(E)ISA io:%04X irq:%d dma:%d",
3472 info->device_name, info->io_base,
3473 info->irq_level, info->dma_level);
3474 }
3475
3476 /* output current serial signal states */
3477 spin_lock_irqsave(&info->irq_spinlock,flags);
3478 usc_get_serial_signals(info);
3479 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3480
3481 stat_buf[0] = 0;
3482 stat_buf[1] = 0;
3483 if (info->serial_signals & SerialSignal_RTS)
3484 strcat(stat_buf, "|RTS");
3485 if (info->serial_signals & SerialSignal_CTS)
3486 strcat(stat_buf, "|CTS");
3487 if (info->serial_signals & SerialSignal_DTR)
3488 strcat(stat_buf, "|DTR");
3489 if (info->serial_signals & SerialSignal_DSR)
3490 strcat(stat_buf, "|DSR");
3491 if (info->serial_signals & SerialSignal_DCD)
3492 strcat(stat_buf, "|CD");
3493 if (info->serial_signals & SerialSignal_RI)
3494 strcat(stat_buf, "|RI");
3495
3496 if (info->params.mode == MGSL_MODE_HDLC ||
3497 info->params.mode == MGSL_MODE_RAW ) {
3498 seq_printf(m, " HDLC txok:%d rxok:%d",
3499 info->icount.txok, info->icount.rxok);
3500 if (info->icount.txunder)
3501 seq_printf(m, " txunder:%d", info->icount.txunder);
3502 if (info->icount.txabort)
3503 seq_printf(m, " txabort:%d", info->icount.txabort);
3504 if (info->icount.rxshort)
3505 seq_printf(m, " rxshort:%d", info->icount.rxshort);
3506 if (info->icount.rxlong)
3507 seq_printf(m, " rxlong:%d", info->icount.rxlong);
3508 if (info->icount.rxover)
3509 seq_printf(m, " rxover:%d", info->icount.rxover);
3510 if (info->icount.rxcrc)
3511 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
3512 } else {
3513 seq_printf(m, " ASYNC tx:%d rx:%d",
3514 info->icount.tx, info->icount.rx);
3515 if (info->icount.frame)
3516 seq_printf(m, " fe:%d", info->icount.frame);
3517 if (info->icount.parity)
3518 seq_printf(m, " pe:%d", info->icount.parity);
3519 if (info->icount.brk)
3520 seq_printf(m, " brk:%d", info->icount.brk);
3521 if (info->icount.overrun)
3522 seq_printf(m, " oe:%d", info->icount.overrun);
3523 }
3524
3525 /* Append serial signal status to end */
3526 seq_printf(m, " %s\n", stat_buf+1);
3527
3528 seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
3529 info->tx_active,info->bh_requested,info->bh_running,
3530 info->pending_bh);
3531
3532 spin_lock_irqsave(&info->irq_spinlock,flags);
3533 {
3534 u16 Tcsr = usc_InReg( info, TCSR );
3535 u16 Tdmr = usc_InDmaReg( info, TDMR );
3536 u16 Ticr = usc_InReg( info, TICR );
3537 u16 Rscr = usc_InReg( info, RCSR );
3538 u16 Rdmr = usc_InDmaReg( info, RDMR );
3539 u16 Ricr = usc_InReg( info, RICR );
3540 u16 Icr = usc_InReg( info, ICR );
3541 u16 Dccr = usc_InReg( info, DCCR );
3542 u16 Tmr = usc_InReg( info, TMR );
3543 u16 Tccr = usc_InReg( info, TCCR );
3544 u16 Ccar = inw( info->io_base + CCAR );
3545 seq_printf(m, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
3546 "ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
3547 Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
3548 }
3549 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3550}
3551
3552/* Called to print information about devices */
3553static int mgsl_proc_show(struct seq_file *m, void *v)
3554{
3555 struct mgsl_struct *info;
3556
3557 seq_printf(m, "synclink driver:%s\n", driver_version);
3558
3559 info = mgsl_device_list;
3560 while( info ) {
3561 line_info(m, info);
3562 info = info->next_device;
3563 }
3564 return 0;
3565}
3566
3567static int mgsl_proc_open(struct inode *inode, struct file *file)
3568{
3569 return single_open(file, mgsl_proc_show, NULL);
3570}
3571
3572static const struct file_operations mgsl_proc_fops = {
3573 .owner = THIS_MODULE,
3574 .open = mgsl_proc_open,
3575 .read = seq_read,
3576 .llseek = seq_lseek,
3577 .release = single_release,
3578};
3579
3580/* mgsl_allocate_dma_buffers()
3581 *
3582 * Allocate and format DMA buffers (ISA adapter)
3583 * or format shared memory buffers (PCI adapter).
3584 *
3585 * Arguments: info pointer to device instance data
3586 * Return Value: 0 if success, otherwise error
3587 */
3588static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
3589{
3590 unsigned short BuffersPerFrame;
3591
3592 info->last_mem_alloc = 0;
3593
3594 /* Calculate the number of DMA buffers necessary to hold the */
3595 /* largest allowable frame size. Note: If the max frame size is */
3596 /* not an even multiple of the DMA buffer size then we need to */
3597 /* round the buffer count per frame up one. */
3598
3599 BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
3600 if ( info->max_frame_size % DMABUFFERSIZE )
3601 BuffersPerFrame++;
3602
3603 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3604 /*
3605 * The PCI adapter has 256KBytes of shared memory to use.
3606 * This is 64 PAGE_SIZE buffers.
3607 *
3608 * The first page is used for padding at this time so the
3609 * buffer list does not begin at offset 0 of the PCI
3610 * adapter's shared memory.
3611 *
3612 * The 2nd page is used for the buffer list. A 4K buffer
3613 * list can hold 128 DMA_BUFFER structures at 32 bytes
3614 * each.
3615 *
3616 * This leaves 62 4K pages.
3617 *
3618 * The next N pages are used for transmit frame(s). We
3619 * reserve enough 4K page blocks to hold the required
3620 * number of transmit dma buffers (num_tx_dma_buffers),
3621 * each of MaxFrameSize size.
3622 *
3623 * Of the remaining pages (62-N), determine how many can
3624 * be used to receive full MaxFrameSize inbound frames
3625 */
3626 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3627 info->rx_buffer_count = 62 - info->tx_buffer_count;
3628 } else {
3629 /* Calculate the number of PAGE_SIZE buffers needed for */
3630 /* receive and transmit DMA buffers. */
3631
3632
3633 /* Calculate the number of DMA buffers necessary to */
3634 /* hold 7 max size receive frames and one max size transmit frame. */
3635 /* The receive buffer count is bumped by one so we avoid an */
3636 /* End of List condition if all receive buffers are used when */
3637 /* using linked list DMA buffers. */
3638
3639 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3640 info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
3641
3642 /*
3643 * limit total TxBuffers & RxBuffers to 62 4K total
3644 * (ala PCI Allocation)
3645 */
3646
3647 if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
3648 info->rx_buffer_count = 62 - info->tx_buffer_count;
3649
3650 }
3651
3652 if ( debug_level >= DEBUG_LEVEL_INFO )
3653 printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
3654 __FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
3655
3656 if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
3657 mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 ||
3658 mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 ||
3659 mgsl_alloc_intermediate_rxbuffer_memory(info) < 0 ||
3660 mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
3661 printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
3662 return -ENOMEM;
3663 }
3664
3665 mgsl_reset_rx_dma_buffers( info );
3666 mgsl_reset_tx_dma_buffers( info );
3667
3668 return 0;
3669
3670} /* end of mgsl_allocate_dma_buffers() */
3671
3672/*
3673 * mgsl_alloc_buffer_list_memory()
3674 *
3675 * Allocate a common DMA buffer for use as the
3676 * receive and transmit buffer lists.
3677 *
3678 * A buffer list is a set of buffer entries where each entry contains
3679 * a pointer to an actual buffer and a pointer to the next buffer entry
3680 * (plus some other info about the buffer).
3681 *
3682 * The buffer entries for a list are built to form a circular list so
3683 * that when the entire list has been traversed you start back at the
3684 * beginning.
3685 *
3686 * This function allocates memory for just the buffer entries.
3687 * The links (pointer to next entry) are filled in with the physical
3688 * address of the next entry so the adapter can navigate the list
3689 * using bus master DMA. The pointers to the actual buffers are filled
3690 * out later when the actual buffers are allocated.
3691 *
3692 * Arguments: info pointer to device instance data
3693 * Return Value: 0 if success, otherwise error
3694 */
3695static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
3696{
3697 unsigned int i;
3698
3699 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3700 /* PCI adapter uses shared memory. */
3701 info->buffer_list = info->memory_base + info->last_mem_alloc;
3702 info->buffer_list_phys = info->last_mem_alloc;
3703 info->last_mem_alloc += BUFFERLISTSIZE;
3704 } else {
3705 /* ISA adapter uses system memory. */
3706 /* The buffer lists are allocated as a common buffer that both */
3707 /* the processor and adapter can access. This allows the driver to */
3708 /* inspect portions of the buffer while other portions are being */
3709 /* updated by the adapter using Bus Master DMA. */
3710
3711 info->buffer_list = dma_alloc_coherent(NULL, BUFFERLISTSIZE, &info->buffer_list_dma_addr, GFP_KERNEL);
3712 if (info->buffer_list == NULL)
3713 return -ENOMEM;
3714 info->buffer_list_phys = (u32)(info->buffer_list_dma_addr);
3715 }
3716
3717 /* We got the memory for the buffer entry lists. */
3718 /* Initialize the memory block to all zeros. */
3719 memset( info->buffer_list, 0, BUFFERLISTSIZE );
3720
3721 /* Save virtual address pointers to the receive and */
3722 /* transmit buffer lists. (Receive 1st). These pointers will */
3723 /* be used by the processor to access the lists. */
3724 info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3725 info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3726 info->tx_buffer_list += info->rx_buffer_count;
3727
3728 /*
3729 * Build the links for the buffer entry lists such that
3730 * two circular lists are built. (Transmit and Receive).
3731 *
3732 * Note: the links are physical addresses
3733 * which are read by the adapter to determine the next
3734 * buffer entry to use.
3735 */
3736
3737 for ( i = 0; i < info->rx_buffer_count; i++ ) {
3738 /* calculate and store physical address of this buffer entry */
3739 info->rx_buffer_list[i].phys_entry =
3740 info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
3741
3742 /* calculate and store physical address of */
3743 /* next entry in cirular list of entries */
3744
3745 info->rx_buffer_list[i].link = info->buffer_list_phys;
3746
3747 if ( i < info->rx_buffer_count - 1 )
3748 info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3749 }
3750
3751 for ( i = 0; i < info->tx_buffer_count; i++ ) {
3752 /* calculate and store physical address of this buffer entry */
3753 info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
3754 ((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
3755
3756 /* calculate and store physical address of */
3757 /* next entry in cirular list of entries */
3758
3759 info->tx_buffer_list[i].link = info->buffer_list_phys +
3760 info->rx_buffer_count * sizeof(DMABUFFERENTRY);
3761
3762 if ( i < info->tx_buffer_count - 1 )
3763 info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3764 }
3765
3766 return 0;
3767
3768} /* end of mgsl_alloc_buffer_list_memory() */
3769
3770/* Free DMA buffers allocated for use as the
3771 * receive and transmit buffer lists.
3772 * Warning:
3773 *
3774 * The data transfer buffers associated with the buffer list
3775 * MUST be freed before freeing the buffer list itself because
3776 * the buffer list contains the information necessary to free
3777 * the individual buffers!
3778 */
3779static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
3780{
3781 if (info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI)
3782 dma_free_coherent(NULL, BUFFERLISTSIZE, info->buffer_list, info->buffer_list_dma_addr);
3783
3784 info->buffer_list = NULL;
3785 info->rx_buffer_list = NULL;
3786 info->tx_buffer_list = NULL;
3787
3788} /* end of mgsl_free_buffer_list_memory() */
3789
3790/*
3791 * mgsl_alloc_frame_memory()
3792 *
3793 * Allocate the frame DMA buffers used by the specified buffer list.
3794 * Each DMA buffer will be one memory page in size. This is necessary
3795 * because memory can fragment enough that it may be impossible
3796 * contiguous pages.
3797 *
3798 * Arguments:
3799 *
3800 * info pointer to device instance data
3801 * BufferList pointer to list of buffer entries
3802 * Buffercount count of buffer entries in buffer list
3803 *
3804 * Return Value: 0 if success, otherwise -ENOMEM
3805 */
3806static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
3807{
3808 int i;
3809 u32 phys_addr;
3810
3811 /* Allocate page sized buffers for the receive buffer list */
3812
3813 for ( i = 0; i < Buffercount; i++ ) {
3814 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3815 /* PCI adapter uses shared memory buffers. */
3816 BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
3817 phys_addr = info->last_mem_alloc;
3818 info->last_mem_alloc += DMABUFFERSIZE;
3819 } else {
3820 /* ISA adapter uses system memory. */
3821 BufferList[i].virt_addr = dma_alloc_coherent(NULL, DMABUFFERSIZE, &BufferList[i].dma_addr, GFP_KERNEL);
3822 if (BufferList[i].virt_addr == NULL)
3823 return -ENOMEM;
3824 phys_addr = (u32)(BufferList[i].dma_addr);
3825 }
3826 BufferList[i].phys_addr = phys_addr;
3827 }
3828
3829 return 0;
3830
3831} /* end of mgsl_alloc_frame_memory() */
3832
3833/*
3834 * mgsl_free_frame_memory()
3835 *
3836 * Free the buffers associated with
3837 * each buffer entry of a buffer list.
3838 *
3839 * Arguments:
3840 *
3841 * info pointer to device instance data
3842 * BufferList pointer to list of buffer entries
3843 * Buffercount count of buffer entries in buffer list
3844 *
3845 * Return Value: None
3846 */
3847static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
3848{
3849 int i;
3850
3851 if ( BufferList ) {
3852 for ( i = 0 ; i < Buffercount ; i++ ) {
3853 if ( BufferList[i].virt_addr ) {
3854 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
3855 dma_free_coherent(NULL, DMABUFFERSIZE, BufferList[i].virt_addr, BufferList[i].dma_addr);
3856 BufferList[i].virt_addr = NULL;
3857 }
3858 }
3859 }
3860
3861} /* end of mgsl_free_frame_memory() */
3862
3863/* mgsl_free_dma_buffers()
3864 *
3865 * Free DMA buffers
3866 *
3867 * Arguments: info pointer to device instance data
3868 * Return Value: None
3869 */
3870static void mgsl_free_dma_buffers( struct mgsl_struct *info )
3871{
3872 mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
3873 mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
3874 mgsl_free_buffer_list_memory( info );
3875
3876} /* end of mgsl_free_dma_buffers() */
3877
3878
3879/*
3880 * mgsl_alloc_intermediate_rxbuffer_memory()
3881 *
3882 * Allocate a buffer large enough to hold max_frame_size. This buffer
3883 * is used to pass an assembled frame to the line discipline.
3884 *
3885 * Arguments:
3886 *
3887 * info pointer to device instance data
3888 *
3889 * Return Value: 0 if success, otherwise -ENOMEM
3890 */
3891static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3892{
3893 info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
3894 if ( info->intermediate_rxbuffer == NULL )
3895 return -ENOMEM;
3896
3897 return 0;
3898
3899} /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
3900
3901/*
3902 * mgsl_free_intermediate_rxbuffer_memory()
3903 *
3904 *
3905 * Arguments:
3906 *
3907 * info pointer to device instance data
3908 *
3909 * Return Value: None
3910 */
3911static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3912{
3913 kfree(info->intermediate_rxbuffer);
3914 info->intermediate_rxbuffer = NULL;
3915
3916} /* end of mgsl_free_intermediate_rxbuffer_memory() */
3917
3918/*
3919 * mgsl_alloc_intermediate_txbuffer_memory()
3920 *
3921 * Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
3922 * This buffer is used to load transmit frames into the adapter's dma transfer
3923 * buffers when there is sufficient space.
3924 *
3925 * Arguments:
3926 *
3927 * info pointer to device instance data
3928 *
3929 * Return Value: 0 if success, otherwise -ENOMEM
3930 */
3931static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
3932{
3933 int i;
3934
3935 if ( debug_level >= DEBUG_LEVEL_INFO )
3936 printk("%s %s(%d) allocating %d tx holding buffers\n",
3937 info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
3938
3939 memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
3940
3941 for ( i=0; i<info->num_tx_holding_buffers; ++i) {
3942 info->tx_holding_buffers[i].buffer =
3943 kmalloc(info->max_frame_size, GFP_KERNEL);
3944 if (info->tx_holding_buffers[i].buffer == NULL) {
3945 for (--i; i >= 0; i--) {
3946 kfree(info->tx_holding_buffers[i].buffer);
3947 info->tx_holding_buffers[i].buffer = NULL;
3948 }
3949 return -ENOMEM;
3950 }
3951 }
3952
3953 return 0;
3954
3955} /* end of mgsl_alloc_intermediate_txbuffer_memory() */
3956
3957/*
3958 * mgsl_free_intermediate_txbuffer_memory()
3959 *
3960 *
3961 * Arguments:
3962 *
3963 * info pointer to device instance data
3964 *
3965 * Return Value: None
3966 */
3967static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
3968{
3969 int i;
3970
3971 for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
3972 kfree(info->tx_holding_buffers[i].buffer);
3973 info->tx_holding_buffers[i].buffer = NULL;
3974 }
3975
3976 info->get_tx_holding_index = 0;
3977 info->put_tx_holding_index = 0;
3978 info->tx_holding_count = 0;
3979
3980} /* end of mgsl_free_intermediate_txbuffer_memory() */
3981
3982
3983/*
3984 * load_next_tx_holding_buffer()
3985 *
3986 * attempts to load the next buffered tx request into the
3987 * tx dma buffers
3988 *
3989 * Arguments:
3990 *
3991 * info pointer to device instance data
3992 *
3993 * Return Value: true if next buffered tx request loaded
3994 * into adapter's tx dma buffer,
3995 * false otherwise
3996 */
3997static bool load_next_tx_holding_buffer(struct mgsl_struct *info)
3998{
3999 bool ret = false;
4000
4001 if ( info->tx_holding_count ) {
4002 /* determine if we have enough tx dma buffers
4003 * to accommodate the next tx frame
4004 */
4005 struct tx_holding_buffer *ptx =
4006 &info->tx_holding_buffers[info->get_tx_holding_index];
4007 int num_free = num_free_tx_dma_buffers(info);
4008 int num_needed = ptx->buffer_size / DMABUFFERSIZE;
4009 if ( ptx->buffer_size % DMABUFFERSIZE )
4010 ++num_needed;
4011
4012 if (num_needed <= num_free) {
4013 info->xmit_cnt = ptx->buffer_size;
4014 mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
4015
4016 --info->tx_holding_count;
4017 if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
4018 info->get_tx_holding_index=0;
4019
4020 /* restart transmit timer */
4021 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
4022
4023 ret = true;
4024 }
4025 }
4026
4027 return ret;
4028}
4029
4030/*
4031 * save_tx_buffer_request()
4032 *
4033 * attempt to store transmit frame request for later transmission
4034 *
4035 * Arguments:
4036 *
4037 * info pointer to device instance data
4038 * Buffer pointer to buffer containing frame to load
4039 * BufferSize size in bytes of frame in Buffer
4040 *
4041 * Return Value: 1 if able to store, 0 otherwise
4042 */
4043static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
4044{
4045 struct tx_holding_buffer *ptx;
4046
4047 if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
4048 return 0; /* all buffers in use */
4049 }
4050
4051 ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
4052 ptx->buffer_size = BufferSize;
4053 memcpy( ptx->buffer, Buffer, BufferSize);
4054
4055 ++info->tx_holding_count;
4056 if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
4057 info->put_tx_holding_index=0;
4058
4059 return 1;
4060}
4061
4062static int mgsl_claim_resources(struct mgsl_struct *info)
4063{
4064 if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
4065 printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
4066 __FILE__,__LINE__,info->device_name, info->io_base);
4067 return -ENODEV;
4068 }
4069 info->io_addr_requested = true;
4070
4071 if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
4072 info->device_name, info ) < 0 ) {
4073 printk( "%s(%d):Can't request interrupt on device %s IRQ=%d\n",
4074 __FILE__,__LINE__,info->device_name, info->irq_level );
4075 goto errout;
4076 }
4077 info->irq_requested = true;
4078
4079 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4080 if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
4081 printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
4082 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
4083 goto errout;
4084 }
4085 info->shared_mem_requested = true;
4086 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
4087 printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
4088 __FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
4089 goto errout;
4090 }
4091 info->lcr_mem_requested = true;
4092
4093 info->memory_base = ioremap_nocache(info->phys_memory_base,
4094 0x40000);
4095 if (!info->memory_base) {
4096 printk( "%s(%d):Can't map shared memory on device %s MemAddr=%08X\n",
4097 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4098 goto errout;
4099 }
4100
4101 if ( !mgsl_memory_test(info) ) {
4102 printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
4103 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4104 goto errout;
4105 }
4106
4107 info->lcr_base = ioremap_nocache(info->phys_lcr_base,
4108 PAGE_SIZE);
4109 if (!info->lcr_base) {
4110 printk( "%s(%d):Can't map LCR memory on device %s MemAddr=%08X\n",
4111 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
4112 goto errout;
4113 }
4114 info->lcr_base += info->lcr_offset;
4115
4116 } else {
4117 /* claim DMA channel */
4118
4119 if (request_dma(info->dma_level,info->device_name) < 0){
4120 printk( "%s(%d):Can't request DMA channel on device %s DMA=%d\n",
4121 __FILE__,__LINE__,info->device_name, info->dma_level );
4122 mgsl_release_resources( info );
4123 return -ENODEV;
4124 }
4125 info->dma_requested = true;
4126
4127 /* ISA adapter uses bus master DMA */
4128 set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
4129 enable_dma(info->dma_level);
4130 }
4131
4132 if ( mgsl_allocate_dma_buffers(info) < 0 ) {
4133 printk( "%s(%d):Can't allocate DMA buffers on device %s DMA=%d\n",
4134 __FILE__,__LINE__,info->device_name, info->dma_level );
4135 goto errout;
4136 }
4137
4138 return 0;
4139errout:
4140 mgsl_release_resources(info);
4141 return -ENODEV;
4142
4143} /* end of mgsl_claim_resources() */
4144
4145static void mgsl_release_resources(struct mgsl_struct *info)
4146{
4147 if ( debug_level >= DEBUG_LEVEL_INFO )
4148 printk( "%s(%d):mgsl_release_resources(%s) entry\n",
4149 __FILE__,__LINE__,info->device_name );
4150
4151 if ( info->irq_requested ) {
4152 free_irq(info->irq_level, info);
4153 info->irq_requested = false;
4154 }
4155 if ( info->dma_requested ) {
4156 disable_dma(info->dma_level);
4157 free_dma(info->dma_level);
4158 info->dma_requested = false;
4159 }
4160 mgsl_free_dma_buffers(info);
4161 mgsl_free_intermediate_rxbuffer_memory(info);
4162 mgsl_free_intermediate_txbuffer_memory(info);
4163
4164 if ( info->io_addr_requested ) {
4165 release_region(info->io_base,info->io_addr_size);
4166 info->io_addr_requested = false;
4167 }
4168 if ( info->shared_mem_requested ) {
4169 release_mem_region(info->phys_memory_base,0x40000);
4170 info->shared_mem_requested = false;
4171 }
4172 if ( info->lcr_mem_requested ) {
4173 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
4174 info->lcr_mem_requested = false;
4175 }
4176 if (info->memory_base){
4177 iounmap(info->memory_base);
4178 info->memory_base = NULL;
4179 }
4180 if (info->lcr_base){
4181 iounmap(info->lcr_base - info->lcr_offset);
4182 info->lcr_base = NULL;
4183 }
4184
4185 if ( debug_level >= DEBUG_LEVEL_INFO )
4186 printk( "%s(%d):mgsl_release_resources(%s) exit\n",
4187 __FILE__,__LINE__,info->device_name );
4188
4189} /* end of mgsl_release_resources() */
4190
4191/* mgsl_add_device()
4192 *
4193 * Add the specified device instance data structure to the
4194 * global linked list of devices and increment the device count.
4195 *
4196 * Arguments: info pointer to device instance data
4197 * Return Value: None
4198 */
4199static void mgsl_add_device( struct mgsl_struct *info )
4200{
4201 info->next_device = NULL;
4202 info->line = mgsl_device_count;
4203 sprintf(info->device_name,"ttySL%d",info->line);
4204
4205 if (info->line < MAX_TOTAL_DEVICES) {
4206 if (maxframe[info->line])
4207 info->max_frame_size = maxframe[info->line];
4208
4209 if (txdmabufs[info->line]) {
4210 info->num_tx_dma_buffers = txdmabufs[info->line];
4211 if (info->num_tx_dma_buffers < 1)
4212 info->num_tx_dma_buffers = 1;
4213 }
4214
4215 if (txholdbufs[info->line]) {
4216 info->num_tx_holding_buffers = txholdbufs[info->line];
4217 if (info->num_tx_holding_buffers < 1)
4218 info->num_tx_holding_buffers = 1;
4219 else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
4220 info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
4221 }
4222 }
4223
4224 mgsl_device_count++;
4225
4226 if ( !mgsl_device_list )
4227 mgsl_device_list = info;
4228 else {
4229 struct mgsl_struct *current_dev = mgsl_device_list;
4230 while( current_dev->next_device )
4231 current_dev = current_dev->next_device;
4232 current_dev->next_device = info;
4233 }
4234
4235 if ( info->max_frame_size < 4096 )
4236 info->max_frame_size = 4096;
4237 else if ( info->max_frame_size > 65535 )
4238 info->max_frame_size = 65535;
4239
4240 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4241 printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
4242 info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
4243 info->phys_memory_base, info->phys_lcr_base,
4244 info->max_frame_size );
4245 } else {
4246 printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
4247 info->device_name, info->io_base, info->irq_level, info->dma_level,
4248 info->max_frame_size );
4249 }
4250
4251#if SYNCLINK_GENERIC_HDLC
4252 hdlcdev_init(info);
4253#endif
4254
4255} /* end of mgsl_add_device() */
4256
4257static const struct tty_port_operations mgsl_port_ops = {
4258 .carrier_raised = carrier_raised,
4259 .dtr_rts = dtr_rts,
4260};
4261
4262
4263/* mgsl_allocate_device()
4264 *
4265 * Allocate and initialize a device instance structure
4266 *
4267 * Arguments: none
4268 * Return Value: pointer to mgsl_struct if success, otherwise NULL
4269 */
4270static struct mgsl_struct* mgsl_allocate_device(void)
4271{
4272 struct mgsl_struct *info;
4273
4274 info = kzalloc(sizeof(struct mgsl_struct),
4275 GFP_KERNEL);
4276
4277 if (!info) {
4278 printk("Error can't allocate device instance data\n");
4279 } else {
4280 tty_port_init(&info->port);
4281 info->port.ops = &mgsl_port_ops;
4282 info->magic = MGSL_MAGIC;
4283 INIT_WORK(&info->task, mgsl_bh_handler);
4284 info->max_frame_size = 4096;
4285 info->port.close_delay = 5*HZ/10;
4286 info->port.closing_wait = 30*HZ;
4287 init_waitqueue_head(&info->status_event_wait_q);
4288 init_waitqueue_head(&info->event_wait_q);
4289 spin_lock_init(&info->irq_spinlock);
4290 spin_lock_init(&info->netlock);
4291 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
4292 info->idle_mode = HDLC_TXIDLE_FLAGS;
4293 info->num_tx_dma_buffers = 1;
4294 info->num_tx_holding_buffers = 0;
4295 }
4296
4297 return info;
4298
4299} /* end of mgsl_allocate_device()*/
4300
4301static const struct tty_operations mgsl_ops = {
4302 .open = mgsl_open,
4303 .close = mgsl_close,
4304 .write = mgsl_write,
4305 .put_char = mgsl_put_char,
4306 .flush_chars = mgsl_flush_chars,
4307 .write_room = mgsl_write_room,
4308 .chars_in_buffer = mgsl_chars_in_buffer,
4309 .flush_buffer = mgsl_flush_buffer,
4310 .ioctl = mgsl_ioctl,
4311 .throttle = mgsl_throttle,
4312 .unthrottle = mgsl_unthrottle,
4313 .send_xchar = mgsl_send_xchar,
4314 .break_ctl = mgsl_break,
4315 .wait_until_sent = mgsl_wait_until_sent,
4316 .set_termios = mgsl_set_termios,
4317 .stop = mgsl_stop,
4318 .start = mgsl_start,
4319 .hangup = mgsl_hangup,
4320 .tiocmget = tiocmget,
4321 .tiocmset = tiocmset,
4322 .get_icount = msgl_get_icount,
4323 .proc_fops = &mgsl_proc_fops,
4324};
4325
4326/*
4327 * perform tty device initialization
4328 */
4329static int mgsl_init_tty(void)
4330{
4331 int rc;
4332
4333 serial_driver = alloc_tty_driver(128);
4334 if (!serial_driver)
4335 return -ENOMEM;
4336
4337 serial_driver->owner = THIS_MODULE;
4338 serial_driver->driver_name = "synclink";
4339 serial_driver->name = "ttySL";
4340 serial_driver->major = ttymajor;
4341 serial_driver->minor_start = 64;
4342 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4343 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4344 serial_driver->init_termios = tty_std_termios;
4345 serial_driver->init_termios.c_cflag =
4346 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4347 serial_driver->init_termios.c_ispeed = 9600;
4348 serial_driver->init_termios.c_ospeed = 9600;
4349 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4350 tty_set_operations(serial_driver, &mgsl_ops);
4351 if ((rc = tty_register_driver(serial_driver)) < 0) {
4352 printk("%s(%d):Couldn't register serial driver\n",
4353 __FILE__,__LINE__);
4354 put_tty_driver(serial_driver);
4355 serial_driver = NULL;
4356 return rc;
4357 }
4358
4359 printk("%s %s, tty major#%d\n",
4360 driver_name, driver_version,
4361 serial_driver->major);
4362 return 0;
4363}
4364
4365/* enumerate user specified ISA adapters
4366 */
4367static void mgsl_enum_isa_devices(void)
4368{
4369 struct mgsl_struct *info;
4370 int i;
4371
4372 /* Check for user specified ISA devices */
4373
4374 for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
4375 if ( debug_level >= DEBUG_LEVEL_INFO )
4376 printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
4377 io[i], irq[i], dma[i] );
4378
4379 info = mgsl_allocate_device();
4380 if ( !info ) {
4381 /* error allocating device instance data */
4382 if ( debug_level >= DEBUG_LEVEL_ERROR )
4383 printk( "can't allocate device instance data.\n");
4384 continue;
4385 }
4386
4387 /* Copy user configuration info to device instance data */
4388 info->io_base = (unsigned int)io[i];
4389 info->irq_level = (unsigned int)irq[i];
4390 info->irq_level = irq_canonicalize(info->irq_level);
4391 info->dma_level = (unsigned int)dma[i];
4392 info->bus_type = MGSL_BUS_TYPE_ISA;
4393 info->io_addr_size = 16;
4394 info->irq_flags = 0;
4395
4396 mgsl_add_device( info );
4397 }
4398}
4399
4400static void synclink_cleanup(void)
4401{
4402 int rc;
4403 struct mgsl_struct *info;
4404 struct mgsl_struct *tmp;
4405
4406 printk("Unloading %s: %s\n", driver_name, driver_version);
4407
4408 if (serial_driver) {
4409 if ((rc = tty_unregister_driver(serial_driver)))
4410 printk("%s(%d) failed to unregister tty driver err=%d\n",
4411 __FILE__,__LINE__,rc);
4412 put_tty_driver(serial_driver);
4413 }
4414
4415 info = mgsl_device_list;
4416 while(info) {
4417#if SYNCLINK_GENERIC_HDLC
4418 hdlcdev_exit(info);
4419#endif
4420 mgsl_release_resources(info);
4421 tmp = info;
4422 info = info->next_device;
4423 kfree(tmp);
4424 }
4425
4426 if (pci_registered)
4427 pci_unregister_driver(&synclink_pci_driver);
4428}
4429
4430static int __init synclink_init(void)
4431{
4432 int rc;
4433
4434 if (break_on_load) {
4435 mgsl_get_text_ptr();
4436 BREAKPOINT();
4437 }
4438
4439 printk("%s %s\n", driver_name, driver_version);
4440
4441 mgsl_enum_isa_devices();
4442 if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
4443 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4444 else
4445 pci_registered = true;
4446
4447 if ((rc = mgsl_init_tty()) < 0)
4448 goto error;
4449
4450 return 0;
4451
4452error:
4453 synclink_cleanup();
4454 return rc;
4455}
4456
4457static void __exit synclink_exit(void)
4458{
4459 synclink_cleanup();
4460}
4461
4462module_init(synclink_init);
4463module_exit(synclink_exit);
4464
4465/*
4466 * usc_RTCmd()
4467 *
4468 * Issue a USC Receive/Transmit command to the
4469 * Channel Command/Address Register (CCAR).
4470 *
4471 * Notes:
4472 *
4473 * The command is encoded in the most significant 5 bits <15..11>
4474 * of the CCAR value. Bits <10..7> of the CCAR must be preserved
4475 * and Bits <6..0> must be written as zeros.
4476 *
4477 * Arguments:
4478 *
4479 * info pointer to device information structure
4480 * Cmd command mask (use symbolic macros)
4481 *
4482 * Return Value:
4483 *
4484 * None
4485 */
4486static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
4487{
4488 /* output command to CCAR in bits <15..11> */
4489 /* preserve bits <10..7>, bits <6..0> must be zero */
4490
4491 outw( Cmd + info->loopback_bits, info->io_base + CCAR );
4492
4493 /* Read to flush write to CCAR */
4494 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4495 inw( info->io_base + CCAR );
4496
4497} /* end of usc_RTCmd() */
4498
4499/*
4500 * usc_DmaCmd()
4501 *
4502 * Issue a DMA command to the DMA Command/Address Register (DCAR).
4503 *
4504 * Arguments:
4505 *
4506 * info pointer to device information structure
4507 * Cmd DMA command mask (usc_DmaCmd_XX Macros)
4508 *
4509 * Return Value:
4510 *
4511 * None
4512 */
4513static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
4514{
4515 /* write command mask to DCAR */
4516 outw( Cmd + info->mbre_bit, info->io_base );
4517
4518 /* Read to flush write to DCAR */
4519 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4520 inw( info->io_base );
4521
4522} /* end of usc_DmaCmd() */
4523
4524/*
4525 * usc_OutDmaReg()
4526 *
4527 * Write a 16-bit value to a USC DMA register
4528 *
4529 * Arguments:
4530 *
4531 * info pointer to device info structure
4532 * RegAddr register address (number) for write
4533 * RegValue 16-bit value to write to register
4534 *
4535 * Return Value:
4536 *
4537 * None
4538 *
4539 */
4540static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4541{
4542 /* Note: The DCAR is located at the adapter base address */
4543 /* Note: must preserve state of BIT8 in DCAR */
4544
4545 outw( RegAddr + info->mbre_bit, info->io_base );
4546 outw( RegValue, info->io_base );
4547
4548 /* Read to flush write to DCAR */
4549 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4550 inw( info->io_base );
4551
4552} /* end of usc_OutDmaReg() */
4553
4554/*
4555 * usc_InDmaReg()
4556 *
4557 * Read a 16-bit value from a DMA register
4558 *
4559 * Arguments:
4560 *
4561 * info pointer to device info structure
4562 * RegAddr register address (number) to read from
4563 *
4564 * Return Value:
4565 *
4566 * The 16-bit value read from register
4567 *
4568 */
4569static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
4570{
4571 /* Note: The DCAR is located at the adapter base address */
4572 /* Note: must preserve state of BIT8 in DCAR */
4573
4574 outw( RegAddr + info->mbre_bit, info->io_base );
4575 return inw( info->io_base );
4576
4577} /* end of usc_InDmaReg() */
4578
4579/*
4580 *
4581 * usc_OutReg()
4582 *
4583 * Write a 16-bit value to a USC serial channel register
4584 *
4585 * Arguments:
4586 *
4587 * info pointer to device info structure
4588 * RegAddr register address (number) to write to
4589 * RegValue 16-bit value to write to register
4590 *
4591 * Return Value:
4592 *
4593 * None
4594 *
4595 */
4596static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4597{
4598 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4599 outw( RegValue, info->io_base + CCAR );
4600
4601 /* Read to flush write to CCAR */
4602 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4603 inw( info->io_base + CCAR );
4604
4605} /* end of usc_OutReg() */
4606
4607/*
4608 * usc_InReg()
4609 *
4610 * Reads a 16-bit value from a USC serial channel register
4611 *
4612 * Arguments:
4613 *
4614 * info pointer to device extension
4615 * RegAddr register address (number) to read from
4616 *
4617 * Return Value:
4618 *
4619 * 16-bit value read from register
4620 */
4621static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
4622{
4623 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4624 return inw( info->io_base + CCAR );
4625
4626} /* end of usc_InReg() */
4627
4628/* usc_set_sdlc_mode()
4629 *
4630 * Set up the adapter for SDLC DMA communications.
4631 *
4632 * Arguments: info pointer to device instance data
4633 * Return Value: NONE
4634 */
4635static void usc_set_sdlc_mode( struct mgsl_struct *info )
4636{
4637 u16 RegValue;
4638 bool PreSL1660;
4639
4640 /*
4641 * determine if the IUSC on the adapter is pre-SL1660. If
4642 * not, take advantage of the UnderWait feature of more
4643 * modern chips. If an underrun occurs and this bit is set,
4644 * the transmitter will idle the programmed idle pattern
4645 * until the driver has time to service the underrun. Otherwise,
4646 * the dma controller may get the cycles previously requested
4647 * and begin transmitting queued tx data.
4648 */
4649 usc_OutReg(info,TMCR,0x1f);
4650 RegValue=usc_InReg(info,TMDR);
4651 PreSL1660 = (RegValue == IUSC_PRE_SL1660);
4652
4653 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
4654 {
4655 /*
4656 ** Channel Mode Register (CMR)
4657 **
4658 ** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
4659 ** <13> 0 0 = Transmit Disabled (initially)
4660 ** <12> 0 1 = Consecutive Idles share common 0
4661 ** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
4662 ** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
4663 ** <3..0> 0110 Receiver Mode = HDLC/SDLC
4664 **
4665 ** 1000 1110 0000 0110 = 0x8e06
4666 */
4667 RegValue = 0x8e06;
4668
4669 /*--------------------------------------------------
4670 * ignore user options for UnderRun Actions and
4671 * preambles
4672 *--------------------------------------------------*/
4673 }
4674 else
4675 {
4676 /* Channel mode Register (CMR)
4677 *
4678 * <15..14> 00 Tx Sub modes, Underrun Action
4679 * <13> 0 1 = Send Preamble before opening flag
4680 * <12> 0 1 = Consecutive Idles share common 0
4681 * <11..8> 0110 Transmitter mode = HDLC/SDLC
4682 * <7..4> 0000 Rx Sub modes, addr/ctrl field handling
4683 * <3..0> 0110 Receiver mode = HDLC/SDLC
4684 *
4685 * 0000 0110 0000 0110 = 0x0606
4686 */
4687 if (info->params.mode == MGSL_MODE_RAW) {
4688 RegValue = 0x0001; /* Set Receive mode = external sync */
4689
4690 usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
4691 (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
4692
4693 /*
4694 * TxSubMode:
4695 * CMR <15> 0 Don't send CRC on Tx Underrun
4696 * CMR <14> x undefined
4697 * CMR <13> 0 Send preamble before openning sync
4698 * CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
4699 *
4700 * TxMode:
4701 * CMR <11-8) 0100 MonoSync
4702 *
4703 * 0x00 0100 xxxx xxxx 04xx
4704 */
4705 RegValue |= 0x0400;
4706 }
4707 else {
4708
4709 RegValue = 0x0606;
4710
4711 if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
4712 RegValue |= BIT14;
4713 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
4714 RegValue |= BIT15;
4715 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
4716 RegValue |= BIT15 + BIT14;
4717 }
4718
4719 if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
4720 RegValue |= BIT13;
4721 }
4722
4723 if ( info->params.mode == MGSL_MODE_HDLC &&
4724 (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
4725 RegValue |= BIT12;
4726
4727 if ( info->params.addr_filter != 0xff )
4728 {
4729 /* set up receive address filtering */
4730 usc_OutReg( info, RSR, info->params.addr_filter );
4731 RegValue |= BIT4;
4732 }
4733
4734 usc_OutReg( info, CMR, RegValue );
4735 info->cmr_value = RegValue;
4736
4737 /* Receiver mode Register (RMR)
4738 *
4739 * <15..13> 000 encoding
4740 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4741 * <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
4742 * <9> 0 1 = Include Receive chars in CRC
4743 * <8> 1 1 = Use Abort/PE bit as abort indicator
4744 * <7..6> 00 Even parity
4745 * <5> 0 parity disabled
4746 * <4..2> 000 Receive Char Length = 8 bits
4747 * <1..0> 00 Disable Receiver
4748 *
4749 * 0000 0101 0000 0000 = 0x0500
4750 */
4751
4752 RegValue = 0x0500;
4753
4754 switch ( info->params.encoding ) {
4755 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4756 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4757 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4758 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4759 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4760 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4761 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4762 }
4763
4764 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4765 RegValue |= BIT9;
4766 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4767 RegValue |= ( BIT12 | BIT10 | BIT9 );
4768
4769 usc_OutReg( info, RMR, RegValue );
4770
4771 /* Set the Receive count Limit Register (RCLR) to 0xffff. */
4772 /* When an opening flag of an SDLC frame is recognized the */
4773 /* Receive Character count (RCC) is loaded with the value in */
4774 /* RCLR. The RCC is decremented for each received byte. The */
4775 /* value of RCC is stored after the closing flag of the frame */
4776 /* allowing the frame size to be computed. */
4777
4778 usc_OutReg( info, RCLR, RCLRVALUE );
4779
4780 usc_RCmd( info, RCmd_SelectRicrdma_level );
4781
4782 /* Receive Interrupt Control Register (RICR)
4783 *
4784 * <15..8> ? RxFIFO DMA Request Level
4785 * <7> 0 Exited Hunt IA (Interrupt Arm)
4786 * <6> 0 Idle Received IA
4787 * <5> 0 Break/Abort IA
4788 * <4> 0 Rx Bound IA
4789 * <3> 1 Queued status reflects oldest 2 bytes in FIFO
4790 * <2> 0 Abort/PE IA
4791 * <1> 1 Rx Overrun IA
4792 * <0> 0 Select TC0 value for readback
4793 *
4794 * 0000 0000 0000 1000 = 0x000a
4795 */
4796
4797 /* Carry over the Exit Hunt and Idle Received bits */
4798 /* in case they have been armed by usc_ArmEvents. */
4799
4800 RegValue = usc_InReg( info, RICR ) & 0xc0;
4801
4802 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4803 usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
4804 else
4805 usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
4806
4807 /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
4808
4809 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
4810 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
4811
4812 /* Transmit mode Register (TMR)
4813 *
4814 * <15..13> 000 encoding
4815 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4816 * <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
4817 * <9> 0 1 = Tx CRC Enabled
4818 * <8> 0 1 = Append CRC to end of transmit frame
4819 * <7..6> 00 Transmit parity Even
4820 * <5> 0 Transmit parity Disabled
4821 * <4..2> 000 Tx Char Length = 8 bits
4822 * <1..0> 00 Disable Transmitter
4823 *
4824 * 0000 0100 0000 0000 = 0x0400
4825 */
4826
4827 RegValue = 0x0400;
4828
4829 switch ( info->params.encoding ) {
4830 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4831 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4832 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4833 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4834 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4835 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4836 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4837 }
4838
4839 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4840 RegValue |= BIT9 + BIT8;
4841 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4842 RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
4843
4844 usc_OutReg( info, TMR, RegValue );
4845
4846 usc_set_txidle( info );
4847
4848
4849 usc_TCmd( info, TCmd_SelectTicrdma_level );
4850
4851 /* Transmit Interrupt Control Register (TICR)
4852 *
4853 * <15..8> ? Transmit FIFO DMA Level
4854 * <7> 0 Present IA (Interrupt Arm)
4855 * <6> 0 Idle Sent IA
4856 * <5> 1 Abort Sent IA
4857 * <4> 1 EOF/EOM Sent IA
4858 * <3> 0 CRC Sent IA
4859 * <2> 1 1 = Wait for SW Trigger to Start Frame
4860 * <1> 1 Tx Underrun IA
4861 * <0> 0 TC0 constant on read back
4862 *
4863 * 0000 0000 0011 0110 = 0x0036
4864 */
4865
4866 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4867 usc_OutReg( info, TICR, 0x0736 );
4868 else
4869 usc_OutReg( info, TICR, 0x1436 );
4870
4871 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
4872 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
4873
4874 /*
4875 ** Transmit Command/Status Register (TCSR)
4876 **
4877 ** <15..12> 0000 TCmd
4878 ** <11> 0/1 UnderWait
4879 ** <10..08> 000 TxIdle
4880 ** <7> x PreSent
4881 ** <6> x IdleSent
4882 ** <5> x AbortSent
4883 ** <4> x EOF/EOM Sent
4884 ** <3> x CRC Sent
4885 ** <2> x All Sent
4886 ** <1> x TxUnder
4887 ** <0> x TxEmpty
4888 **
4889 ** 0000 0000 0000 0000 = 0x0000
4890 */
4891 info->tcsr_value = 0;
4892
4893 if ( !PreSL1660 )
4894 info->tcsr_value |= TCSR_UNDERWAIT;
4895
4896 usc_OutReg( info, TCSR, info->tcsr_value );
4897
4898 /* Clock mode Control Register (CMCR)
4899 *
4900 * <15..14> 00 counter 1 Source = Disabled
4901 * <13..12> 00 counter 0 Source = Disabled
4902 * <11..10> 11 BRG1 Input is TxC Pin
4903 * <9..8> 11 BRG0 Input is TxC Pin
4904 * <7..6> 01 DPLL Input is BRG1 Output
4905 * <5..3> XXX TxCLK comes from Port 0
4906 * <2..0> XXX RxCLK comes from Port 1
4907 *
4908 * 0000 1111 0111 0111 = 0x0f77
4909 */
4910
4911 RegValue = 0x0f40;
4912
4913 if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
4914 RegValue |= 0x0003; /* RxCLK from DPLL */
4915 else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
4916 RegValue |= 0x0004; /* RxCLK from BRG0 */
4917 else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4918 RegValue |= 0x0006; /* RxCLK from TXC Input */
4919 else
4920 RegValue |= 0x0007; /* RxCLK from Port1 */
4921
4922 if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
4923 RegValue |= 0x0018; /* TxCLK from DPLL */
4924 else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
4925 RegValue |= 0x0020; /* TxCLK from BRG0 */
4926 else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4927 RegValue |= 0x0038; /* RxCLK from TXC Input */
4928 else
4929 RegValue |= 0x0030; /* TxCLK from Port0 */
4930
4931 usc_OutReg( info, CMCR, RegValue );
4932
4933
4934 /* Hardware Configuration Register (HCR)
4935 *
4936 * <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
4937 * <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
4938 * <12> 0 CVOK:0=report code violation in biphase
4939 * <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
4940 * <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
4941 * <7..6> 00 reserved
4942 * <5> 0 BRG1 mode:0=continuous,1=single cycle
4943 * <4> X BRG1 Enable
4944 * <3..2> 00 reserved
4945 * <1> 0 BRG0 mode:0=continuous,1=single cycle
4946 * <0> 0 BRG0 Enable
4947 */
4948
4949 RegValue = 0x0000;
4950
4951 if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
4952 u32 XtalSpeed;
4953 u32 DpllDivisor;
4954 u16 Tc;
4955
4956 /* DPLL is enabled. Use BRG1 to provide continuous reference clock */
4957 /* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
4958
4959 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4960 XtalSpeed = 11059200;
4961 else
4962 XtalSpeed = 14745600;
4963
4964 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4965 DpllDivisor = 16;
4966 RegValue |= BIT10;
4967 }
4968 else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4969 DpllDivisor = 8;
4970 RegValue |= BIT11;
4971 }
4972 else
4973 DpllDivisor = 32;
4974
4975 /* Tc = (Xtal/Speed) - 1 */
4976 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
4977 /* then rounding up gives a more precise time constant. Instead */
4978 /* of rounding up and then subtracting 1 we just don't subtract */
4979 /* the one in this case. */
4980
4981 /*--------------------------------------------------
4982 * ejz: for DPLL mode, application should use the
4983 * same clock speed as the partner system, even
4984 * though clocking is derived from the input RxData.
4985 * In case the user uses a 0 for the clock speed,
4986 * default to 0xffffffff and don't try to divide by
4987 * zero
4988 *--------------------------------------------------*/
4989 if ( info->params.clock_speed )
4990 {
4991 Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
4992 if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
4993 / info->params.clock_speed) )
4994 Tc--;
4995 }
4996 else
4997 Tc = -1;
4998
4999
5000 /* Write 16-bit Time Constant for BRG1 */
5001 usc_OutReg( info, TC1R, Tc );
5002
5003 RegValue |= BIT4; /* enable BRG1 */
5004
5005 switch ( info->params.encoding ) {
5006 case HDLC_ENCODING_NRZ:
5007 case HDLC_ENCODING_NRZB:
5008 case HDLC_ENCODING_NRZI_MARK:
5009 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
5010 case HDLC_ENCODING_BIPHASE_MARK:
5011 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
5012 case HDLC_ENCODING_BIPHASE_LEVEL:
5013 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
5014 }
5015 }
5016
5017 usc_OutReg( info, HCR, RegValue );
5018
5019
5020 /* Channel Control/status Register (CCSR)
5021 *
5022 * <15> X RCC FIFO Overflow status (RO)
5023 * <14> X RCC FIFO Not Empty status (RO)
5024 * <13> 0 1 = Clear RCC FIFO (WO)
5025 * <12> X DPLL Sync (RW)
5026 * <11> X DPLL 2 Missed Clocks status (RO)
5027 * <10> X DPLL 1 Missed Clock status (RO)
5028 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
5029 * <7> X SDLC Loop On status (RO)
5030 * <6> X SDLC Loop Send status (RO)
5031 * <5> 1 Bypass counters for TxClk and RxClk (RW)
5032 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
5033 * <1..0> 00 reserved
5034 *
5035 * 0000 0000 0010 0000 = 0x0020
5036 */
5037
5038 usc_OutReg( info, CCSR, 0x1020 );
5039
5040
5041 if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
5042 usc_OutReg( info, SICR,
5043 (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
5044 }
5045
5046
5047 /* enable Master Interrupt Enable bit (MIE) */
5048 usc_EnableMasterIrqBit( info );
5049
5050 usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
5051 TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
5052
5053 /* arm RCC underflow interrupt */
5054 usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
5055 usc_EnableInterrupts(info, MISC);
5056
5057 info->mbre_bit = 0;
5058 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5059 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5060 info->mbre_bit = BIT8;
5061 outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
5062
5063 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
5064 /* Enable DMAEN (Port 7, Bit 14) */
5065 /* This connects the DMA request signal to the ISA bus */
5066 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
5067 }
5068
5069 /* DMA Control Register (DCR)
5070 *
5071 * <15..14> 10 Priority mode = Alternating Tx/Rx
5072 * 01 Rx has priority
5073 * 00 Tx has priority
5074 *
5075 * <13> 1 Enable Priority Preempt per DCR<15..14>
5076 * (WARNING DCR<11..10> must be 00 when this is 1)
5077 * 0 Choose activate channel per DCR<11..10>
5078 *
5079 * <12> 0 Little Endian for Array/List
5080 * <11..10> 00 Both Channels can use each bus grant
5081 * <9..6> 0000 reserved
5082 * <5> 0 7 CLK - Minimum Bus Re-request Interval
5083 * <4> 0 1 = drive D/C and S/D pins
5084 * <3> 1 1 = Add one wait state to all DMA cycles.
5085 * <2> 0 1 = Strobe /UAS on every transfer.
5086 * <1..0> 11 Addr incrementing only affects LS24 bits
5087 *
5088 * 0110 0000 0000 1011 = 0x600b
5089 */
5090
5091 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5092 /* PCI adapter does not need DMA wait state */
5093 usc_OutDmaReg( info, DCR, 0xa00b );
5094 }
5095 else
5096 usc_OutDmaReg( info, DCR, 0x800b );
5097
5098
5099 /* Receive DMA mode Register (RDMR)
5100 *
5101 * <15..14> 11 DMA mode = Linked List Buffer mode
5102 * <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
5103 * <12> 1 Clear count of List Entry after fetching
5104 * <11..10> 00 Address mode = Increment
5105 * <9> 1 Terminate Buffer on RxBound
5106 * <8> 0 Bus Width = 16bits
5107 * <7..0> ? status Bits (write as 0s)
5108 *
5109 * 1111 0010 0000 0000 = 0xf200
5110 */
5111
5112 usc_OutDmaReg( info, RDMR, 0xf200 );
5113
5114
5115 /* Transmit DMA mode Register (TDMR)
5116 *
5117 * <15..14> 11 DMA mode = Linked List Buffer mode
5118 * <13> 1 TCBinA/L = fetch Tx Control Block from List entry
5119 * <12> 1 Clear count of List Entry after fetching
5120 * <11..10> 00 Address mode = Increment
5121 * <9> 1 Terminate Buffer on end of frame
5122 * <8> 0 Bus Width = 16bits
5123 * <7..0> ? status Bits (Read Only so write as 0)
5124 *
5125 * 1111 0010 0000 0000 = 0xf200
5126 */
5127
5128 usc_OutDmaReg( info, TDMR, 0xf200 );
5129
5130
5131 /* DMA Interrupt Control Register (DICR)
5132 *
5133 * <15> 1 DMA Interrupt Enable
5134 * <14> 0 1 = Disable IEO from USC
5135 * <13> 0 1 = Don't provide vector during IntAck
5136 * <12> 1 1 = Include status in Vector
5137 * <10..2> 0 reserved, Must be 0s
5138 * <1> 0 1 = Rx DMA Interrupt Enabled
5139 * <0> 0 1 = Tx DMA Interrupt Enabled
5140 *
5141 * 1001 0000 0000 0000 = 0x9000
5142 */
5143
5144 usc_OutDmaReg( info, DICR, 0x9000 );
5145
5146 usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
5147 usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
5148 usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
5149
5150 /* Channel Control Register (CCR)
5151 *
5152 * <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
5153 * <13> 0 Trigger Tx on SW Command Disabled
5154 * <12> 0 Flag Preamble Disabled
5155 * <11..10> 00 Preamble Length
5156 * <9..8> 00 Preamble Pattern
5157 * <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
5158 * <5> 0 Trigger Rx on SW Command Disabled
5159 * <4..0> 0 reserved
5160 *
5161 * 1000 0000 1000 0000 = 0x8080
5162 */
5163
5164 RegValue = 0x8080;
5165
5166 switch ( info->params.preamble_length ) {
5167 case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
5168 case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
5169 case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
5170 }
5171
5172 switch ( info->params.preamble ) {
5173 case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
5174 case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
5175 case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
5176 case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
5177 }
5178
5179 usc_OutReg( info, CCR, RegValue );
5180
5181
5182 /*
5183 * Burst/Dwell Control Register
5184 *
5185 * <15..8> 0x20 Maximum number of transfers per bus grant
5186 * <7..0> 0x00 Maximum number of clock cycles per bus grant
5187 */
5188
5189 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5190 /* don't limit bus occupancy on PCI adapter */
5191 usc_OutDmaReg( info, BDCR, 0x0000 );
5192 }
5193 else
5194 usc_OutDmaReg( info, BDCR, 0x2000 );
5195
5196 usc_stop_transmitter(info);
5197 usc_stop_receiver(info);
5198
5199} /* end of usc_set_sdlc_mode() */
5200
5201/* usc_enable_loopback()
5202 *
5203 * Set the 16C32 for internal loopback mode.
5204 * The TxCLK and RxCLK signals are generated from the BRG0 and
5205 * the TxD is looped back to the RxD internally.
5206 *
5207 * Arguments: info pointer to device instance data
5208 * enable 1 = enable loopback, 0 = disable
5209 * Return Value: None
5210 */
5211static void usc_enable_loopback(struct mgsl_struct *info, int enable)
5212{
5213 if (enable) {
5214 /* blank external TXD output */
5215 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
5216
5217 /* Clock mode Control Register (CMCR)
5218 *
5219 * <15..14> 00 counter 1 Disabled
5220 * <13..12> 00 counter 0 Disabled
5221 * <11..10> 11 BRG1 Input is TxC Pin
5222 * <9..8> 11 BRG0 Input is TxC Pin
5223 * <7..6> 01 DPLL Input is BRG1 Output
5224 * <5..3> 100 TxCLK comes from BRG0
5225 * <2..0> 100 RxCLK comes from BRG0
5226 *
5227 * 0000 1111 0110 0100 = 0x0f64
5228 */
5229
5230 usc_OutReg( info, CMCR, 0x0f64 );
5231
5232 /* Write 16-bit Time Constant for BRG0 */
5233 /* use clock speed if available, otherwise use 8 for diagnostics */
5234 if (info->params.clock_speed) {
5235 if (info->bus_type == MGSL_BUS_TYPE_PCI)
5236 usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
5237 else
5238 usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
5239 } else
5240 usc_OutReg(info, TC0R, (u16)8);
5241
5242 /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
5243 mode = Continuous Set Bit 0 to enable BRG0. */
5244 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5245
5246 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5247 usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
5248
5249 /* set Internal Data loopback mode */
5250 info->loopback_bits = 0x300;
5251 outw( 0x0300, info->io_base + CCAR );
5252 } else {
5253 /* enable external TXD output */
5254 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
5255
5256 /* clear Internal Data loopback mode */
5257 info->loopback_bits = 0;
5258 outw( 0,info->io_base + CCAR );
5259 }
5260
5261} /* end of usc_enable_loopback() */
5262
5263/* usc_enable_aux_clock()
5264 *
5265 * Enabled the AUX clock output at the specified frequency.
5266 *
5267 * Arguments:
5268 *
5269 * info pointer to device extension
5270 * data_rate data rate of clock in bits per second
5271 * A data rate of 0 disables the AUX clock.
5272 *
5273 * Return Value: None
5274 */
5275static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
5276{
5277 u32 XtalSpeed;
5278 u16 Tc;
5279
5280 if ( data_rate ) {
5281 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5282 XtalSpeed = 11059200;
5283 else
5284 XtalSpeed = 14745600;
5285
5286
5287 /* Tc = (Xtal/Speed) - 1 */
5288 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5289 /* then rounding up gives a more precise time constant. Instead */
5290 /* of rounding up and then subtracting 1 we just don't subtract */
5291 /* the one in this case. */
5292
5293
5294 Tc = (u16)(XtalSpeed/data_rate);
5295 if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
5296 Tc--;
5297
5298 /* Write 16-bit Time Constant for BRG0 */
5299 usc_OutReg( info, TC0R, Tc );
5300
5301 /*
5302 * Hardware Configuration Register (HCR)
5303 * Clear Bit 1, BRG0 mode = Continuous
5304 * Set Bit 0 to enable BRG0.
5305 */
5306
5307 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5308
5309 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5310 usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
5311 } else {
5312 /* data rate == 0 so turn off BRG0 */
5313 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
5314 }
5315
5316} /* end of usc_enable_aux_clock() */
5317
5318/*
5319 *
5320 * usc_process_rxoverrun_sync()
5321 *
5322 * This function processes a receive overrun by resetting the
5323 * receive DMA buffers and issuing a Purge Rx FIFO command
5324 * to allow the receiver to continue receiving.
5325 *
5326 * Arguments:
5327 *
5328 * info pointer to device extension
5329 *
5330 * Return Value: None
5331 */
5332static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
5333{
5334 int start_index;
5335 int end_index;
5336 int frame_start_index;
5337 bool start_of_frame_found = false;
5338 bool end_of_frame_found = false;
5339 bool reprogram_dma = false;
5340
5341 DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
5342 u32 phys_addr;
5343
5344 usc_DmaCmd( info, DmaCmd_PauseRxChannel );
5345 usc_RCmd( info, RCmd_EnterHuntmode );
5346 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5347
5348 /* CurrentRxBuffer points to the 1st buffer of the next */
5349 /* possibly available receive frame. */
5350
5351 frame_start_index = start_index = end_index = info->current_rx_buffer;
5352
5353 /* Search for an unfinished string of buffers. This means */
5354 /* that a receive frame started (at least one buffer with */
5355 /* count set to zero) but there is no terminiting buffer */
5356 /* (status set to non-zero). */
5357
5358 while( !buffer_list[end_index].count )
5359 {
5360 /* Count field has been reset to zero by 16C32. */
5361 /* This buffer is currently in use. */
5362
5363 if ( !start_of_frame_found )
5364 {
5365 start_of_frame_found = true;
5366 frame_start_index = end_index;
5367 end_of_frame_found = false;
5368 }
5369
5370 if ( buffer_list[end_index].status )
5371 {
5372 /* Status field has been set by 16C32. */
5373 /* This is the last buffer of a received frame. */
5374
5375 /* We want to leave the buffers for this frame intact. */
5376 /* Move on to next possible frame. */
5377
5378 start_of_frame_found = false;
5379 end_of_frame_found = true;
5380 }
5381
5382 /* advance to next buffer entry in linked list */
5383 end_index++;
5384 if ( end_index == info->rx_buffer_count )
5385 end_index = 0;
5386
5387 if ( start_index == end_index )
5388 {
5389 /* The entire list has been searched with all Counts == 0 and */
5390 /* all Status == 0. The receive buffers are */
5391 /* completely screwed, reset all receive buffers! */
5392 mgsl_reset_rx_dma_buffers( info );
5393 frame_start_index = 0;
5394 start_of_frame_found = false;
5395 reprogram_dma = true;
5396 break;
5397 }
5398 }
5399
5400 if ( start_of_frame_found && !end_of_frame_found )
5401 {
5402 /* There is an unfinished string of receive DMA buffers */
5403 /* as a result of the receiver overrun. */
5404
5405 /* Reset the buffers for the unfinished frame */
5406 /* and reprogram the receive DMA controller to start */
5407 /* at the 1st buffer of unfinished frame. */
5408
5409 start_index = frame_start_index;
5410
5411 do
5412 {
5413 *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
5414
5415 /* Adjust index for wrap around. */
5416 if ( start_index == info->rx_buffer_count )
5417 start_index = 0;
5418
5419 } while( start_index != end_index );
5420
5421 reprogram_dma = true;
5422 }
5423
5424 if ( reprogram_dma )
5425 {
5426 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
5427 usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5428 usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5429
5430 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5431
5432 /* This empties the receive FIFO and loads the RCC with RCLR */
5433 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5434
5435 /* program 16C32 with physical address of 1st DMA buffer entry */
5436 phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
5437 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5438 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5439
5440 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5441 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5442 usc_EnableInterrupts( info, RECEIVE_STATUS );
5443
5444 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5445 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5446
5447 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5448 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5449 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5450 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5451 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5452 else
5453 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5454 }
5455 else
5456 {
5457 /* This empties the receive FIFO and loads the RCC with RCLR */
5458 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5459 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5460 }
5461
5462} /* end of usc_process_rxoverrun_sync() */
5463
5464/* usc_stop_receiver()
5465 *
5466 * Disable USC receiver
5467 *
5468 * Arguments: info pointer to device instance data
5469 * Return Value: None
5470 */
5471static void usc_stop_receiver( struct mgsl_struct *info )
5472{
5473 if (debug_level >= DEBUG_LEVEL_ISR)
5474 printk("%s(%d):usc_stop_receiver(%s)\n",
5475 __FILE__,__LINE__, info->device_name );
5476
5477 /* Disable receive DMA channel. */
5478 /* This also disables receive DMA channel interrupts */
5479 usc_DmaCmd( info, DmaCmd_ResetRxChannel );
5480
5481 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5482 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5483 usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
5484
5485 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5486
5487 /* This empties the receive FIFO and loads the RCC with RCLR */
5488 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5489 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5490
5491 info->rx_enabled = false;
5492 info->rx_overflow = false;
5493 info->rx_rcc_underrun = false;
5494
5495} /* end of stop_receiver() */
5496
5497/* usc_start_receiver()
5498 *
5499 * Enable the USC receiver
5500 *
5501 * Arguments: info pointer to device instance data
5502 * Return Value: None
5503 */
5504static void usc_start_receiver( struct mgsl_struct *info )
5505{
5506 u32 phys_addr;
5507
5508 if (debug_level >= DEBUG_LEVEL_ISR)
5509 printk("%s(%d):usc_start_receiver(%s)\n",
5510 __FILE__,__LINE__, info->device_name );
5511
5512 mgsl_reset_rx_dma_buffers( info );
5513 usc_stop_receiver( info );
5514
5515 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5516 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5517
5518 if ( info->params.mode == MGSL_MODE_HDLC ||
5519 info->params.mode == MGSL_MODE_RAW ) {
5520 /* DMA mode Transfers */
5521 /* Program the DMA controller. */
5522 /* Enable the DMA controller end of buffer interrupt. */
5523
5524 /* program 16C32 with physical address of 1st DMA buffer entry */
5525 phys_addr = info->rx_buffer_list[0].phys_entry;
5526 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5527 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5528
5529 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5530 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5531 usc_EnableInterrupts( info, RECEIVE_STATUS );
5532
5533 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5534 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5535
5536 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5537 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5538 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5539 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5540 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5541 else
5542 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5543 } else {
5544 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
5545 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
5546 usc_EnableInterrupts(info, RECEIVE_DATA);
5547
5548 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5549 usc_RCmd( info, RCmd_EnterHuntmode );
5550
5551 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5552 }
5553
5554 usc_OutReg( info, CCSR, 0x1020 );
5555
5556 info->rx_enabled = true;
5557
5558} /* end of usc_start_receiver() */
5559
5560/* usc_start_transmitter()
5561 *
5562 * Enable the USC transmitter and send a transmit frame if
5563 * one is loaded in the DMA buffers.
5564 *
5565 * Arguments: info pointer to device instance data
5566 * Return Value: None
5567 */
5568static void usc_start_transmitter( struct mgsl_struct *info )
5569{
5570 u32 phys_addr;
5571 unsigned int FrameSize;
5572
5573 if (debug_level >= DEBUG_LEVEL_ISR)
5574 printk("%s(%d):usc_start_transmitter(%s)\n",
5575 __FILE__,__LINE__, info->device_name );
5576
5577 if ( info->xmit_cnt ) {
5578
5579 /* If auto RTS enabled and RTS is inactive, then assert */
5580 /* RTS and set a flag indicating that the driver should */
5581 /* negate RTS when the transmission completes. */
5582
5583 info->drop_rts_on_tx_done = false;
5584
5585 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
5586 usc_get_serial_signals( info );
5587 if ( !(info->serial_signals & SerialSignal_RTS) ) {
5588 info->serial_signals |= SerialSignal_RTS;
5589 usc_set_serial_signals( info );
5590 info->drop_rts_on_tx_done = true;
5591 }
5592 }
5593
5594
5595 if ( info->params.mode == MGSL_MODE_ASYNC ) {
5596 if ( !info->tx_active ) {
5597 usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
5598 usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
5599 usc_EnableInterrupts(info, TRANSMIT_DATA);
5600 usc_load_txfifo(info);
5601 }
5602 } else {
5603 /* Disable transmit DMA controller while programming. */
5604 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5605
5606 /* Transmit DMA buffer is loaded, so program USC */
5607 /* to send the frame contained in the buffers. */
5608
5609 FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
5610
5611 /* if operating in Raw sync mode, reset the rcc component
5612 * of the tx dma buffer entry, otherwise, the serial controller
5613 * will send a closing sync char after this count.
5614 */
5615 if ( info->params.mode == MGSL_MODE_RAW )
5616 info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
5617
5618 /* Program the Transmit Character Length Register (TCLR) */
5619 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
5620 usc_OutReg( info, TCLR, (u16)FrameSize );
5621
5622 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5623
5624 /* Program the address of the 1st DMA Buffer Entry in linked list */
5625 phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
5626 usc_OutDmaReg( info, NTARL, (u16)phys_addr );
5627 usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
5628
5629 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5630 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5631 usc_EnableInterrupts( info, TRANSMIT_STATUS );
5632
5633 if ( info->params.mode == MGSL_MODE_RAW &&
5634 info->num_tx_dma_buffers > 1 ) {
5635 /* When running external sync mode, attempt to 'stream' transmit */
5636 /* by filling tx dma buffers as they become available. To do this */
5637 /* we need to enable Tx DMA EOB Status interrupts : */
5638 /* */
5639 /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
5640 /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
5641
5642 usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
5643 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
5644 }
5645
5646 /* Initialize Transmit DMA Channel */
5647 usc_DmaCmd( info, DmaCmd_InitTxChannel );
5648
5649 usc_TCmd( info, TCmd_SendFrame );
5650
5651 mod_timer(&info->tx_timer, jiffies +
5652 msecs_to_jiffies(5000));
5653 }
5654 info->tx_active = true;
5655 }
5656
5657 if ( !info->tx_enabled ) {
5658 info->tx_enabled = true;
5659 if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
5660 usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
5661 else
5662 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
5663 }
5664
5665} /* end of usc_start_transmitter() */
5666
5667/* usc_stop_transmitter()
5668 *
5669 * Stops the transmitter and DMA
5670 *
5671 * Arguments: info pointer to device isntance data
5672 * Return Value: None
5673 */
5674static void usc_stop_transmitter( struct mgsl_struct *info )
5675{
5676 if (debug_level >= DEBUG_LEVEL_ISR)
5677 printk("%s(%d):usc_stop_transmitter(%s)\n",
5678 __FILE__,__LINE__, info->device_name );
5679
5680 del_timer(&info->tx_timer);
5681
5682 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5683 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5684 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5685
5686 usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
5687 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5688 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5689
5690 info->tx_enabled = false;
5691 info->tx_active = false;
5692
5693} /* end of usc_stop_transmitter() */
5694
5695/* usc_load_txfifo()
5696 *
5697 * Fill the transmit FIFO until the FIFO is full or
5698 * there is no more data to load.
5699 *
5700 * Arguments: info pointer to device extension (instance data)
5701 * Return Value: None
5702 */
5703static void usc_load_txfifo( struct mgsl_struct *info )
5704{
5705 int Fifocount;
5706 u8 TwoBytes[2];
5707
5708 if ( !info->xmit_cnt && !info->x_char )
5709 return;
5710
5711 /* Select transmit FIFO status readback in TICR */
5712 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
5713
5714 /* load the Transmit FIFO until FIFOs full or all data sent */
5715
5716 while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
5717 /* there is more space in the transmit FIFO and */
5718 /* there is more data in transmit buffer */
5719
5720 if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
5721 /* write a 16-bit word from transmit buffer to 16C32 */
5722
5723 TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
5724 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5725 TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
5726 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5727
5728 outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
5729
5730 info->xmit_cnt -= 2;
5731 info->icount.tx += 2;
5732 } else {
5733 /* only 1 byte left to transmit or 1 FIFO slot left */
5734
5735 outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
5736 info->io_base + CCAR );
5737
5738 if (info->x_char) {
5739 /* transmit pending high priority char */
5740 outw( info->x_char,info->io_base + CCAR );
5741 info->x_char = 0;
5742 } else {
5743 outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
5744 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5745 info->xmit_cnt--;
5746 }
5747 info->icount.tx++;
5748 }
5749 }
5750
5751} /* end of usc_load_txfifo() */
5752
5753/* usc_reset()
5754 *
5755 * Reset the adapter to a known state and prepare it for further use.
5756 *
5757 * Arguments: info pointer to device instance data
5758 * Return Value: None
5759 */
5760static void usc_reset( struct mgsl_struct *info )
5761{
5762 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5763 int i;
5764 u32 readval;
5765
5766 /* Set BIT30 of Misc Control Register */
5767 /* (Local Control Register 0x50) to force reset of USC. */
5768
5769 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5770 u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
5771
5772 info->misc_ctrl_value |= BIT30;
5773 *MiscCtrl = info->misc_ctrl_value;
5774
5775 /*
5776 * Force at least 170ns delay before clearing
5777 * reset bit. Each read from LCR takes at least
5778 * 30ns so 10 times for 300ns to be safe.
5779 */
5780 for(i=0;i<10;i++)
5781 readval = *MiscCtrl;
5782
5783 info->misc_ctrl_value &= ~BIT30;
5784 *MiscCtrl = info->misc_ctrl_value;
5785
5786 *LCR0BRDR = BUS_DESCRIPTOR(
5787 1, // Write Strobe Hold (0-3)
5788 2, // Write Strobe Delay (0-3)
5789 2, // Read Strobe Delay (0-3)
5790 0, // NWDD (Write data-data) (0-3)
5791 4, // NWAD (Write Addr-data) (0-31)
5792 0, // NXDA (Read/Write Data-Addr) (0-3)
5793 0, // NRDD (Read Data-Data) (0-3)
5794 5 // NRAD (Read Addr-Data) (0-31)
5795 );
5796 } else {
5797 /* do HW reset */
5798 outb( 0,info->io_base + 8 );
5799 }
5800
5801 info->mbre_bit = 0;
5802 info->loopback_bits = 0;
5803 info->usc_idle_mode = 0;
5804
5805 /*
5806 * Program the Bus Configuration Register (BCR)
5807 *
5808 * <15> 0 Don't use separate address
5809 * <14..6> 0 reserved
5810 * <5..4> 00 IAckmode = Default, don't care
5811 * <3> 1 Bus Request Totem Pole output
5812 * <2> 1 Use 16 Bit data bus
5813 * <1> 0 IRQ Totem Pole output
5814 * <0> 0 Don't Shift Right Addr
5815 *
5816 * 0000 0000 0000 1100 = 0x000c
5817 *
5818 * By writing to io_base + SDPIN the Wait/Ack pin is
5819 * programmed to work as a Wait pin.
5820 */
5821
5822 outw( 0x000c,info->io_base + SDPIN );
5823
5824
5825 outw( 0,info->io_base );
5826 outw( 0,info->io_base + CCAR );
5827
5828 /* select little endian byte ordering */
5829 usc_RTCmd( info, RTCmd_SelectLittleEndian );
5830
5831
5832 /* Port Control Register (PCR)
5833 *
5834 * <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
5835 * <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
5836 * <11..10> 00 Port 5 is Input (No Connect, Don't Care)
5837 * <9..8> 00 Port 4 is Input (No Connect, Don't Care)
5838 * <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
5839 * <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
5840 * <3..2> 01 Port 1 is Input (Dedicated RxC)
5841 * <1..0> 01 Port 0 is Input (Dedicated TxC)
5842 *
5843 * 1111 0000 1111 0101 = 0xf0f5
5844 */
5845
5846 usc_OutReg( info, PCR, 0xf0f5 );
5847
5848
5849 /*
5850 * Input/Output Control Register
5851 *
5852 * <15..14> 00 CTS is active low input
5853 * <13..12> 00 DCD is active low input
5854 * <11..10> 00 TxREQ pin is input (DSR)
5855 * <9..8> 00 RxREQ pin is input (RI)
5856 * <7..6> 00 TxD is output (Transmit Data)
5857 * <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
5858 * <2..0> 100 RxC is Output (drive with BRG0)
5859 *
5860 * 0000 0000 0000 0100 = 0x0004
5861 */
5862
5863 usc_OutReg( info, IOCR, 0x0004 );
5864
5865} /* end of usc_reset() */
5866
5867/* usc_set_async_mode()
5868 *
5869 * Program adapter for asynchronous communications.
5870 *
5871 * Arguments: info pointer to device instance data
5872 * Return Value: None
5873 */
5874static void usc_set_async_mode( struct mgsl_struct *info )
5875{
5876 u16 RegValue;
5877
5878 /* disable interrupts while programming USC */
5879 usc_DisableMasterIrqBit( info );
5880
5881 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5882 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5883
5884 usc_loopback_frame( info );
5885
5886 /* Channel mode Register (CMR)
5887 *
5888 * <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
5889 * <13..12> 00 00 = 16X Clock
5890 * <11..8> 0000 Transmitter mode = Asynchronous
5891 * <7..6> 00 reserved?
5892 * <5..4> 00 Rx Sub modes, 00 = 16X Clock
5893 * <3..0> 0000 Receiver mode = Asynchronous
5894 *
5895 * 0000 0000 0000 0000 = 0x0
5896 */
5897
5898 RegValue = 0;
5899 if ( info->params.stop_bits != 1 )
5900 RegValue |= BIT14;
5901 usc_OutReg( info, CMR, RegValue );
5902
5903
5904 /* Receiver mode Register (RMR)
5905 *
5906 * <15..13> 000 encoding = None
5907 * <12..08> 00000 reserved (Sync Only)
5908 * <7..6> 00 Even parity
5909 * <5> 0 parity disabled
5910 * <4..2> 000 Receive Char Length = 8 bits
5911 * <1..0> 00 Disable Receiver
5912 *
5913 * 0000 0000 0000 0000 = 0x0
5914 */
5915
5916 RegValue = 0;
5917
5918 if ( info->params.data_bits != 8 )
5919 RegValue |= BIT4+BIT3+BIT2;
5920
5921 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5922 RegValue |= BIT5;
5923 if ( info->params.parity != ASYNC_PARITY_ODD )
5924 RegValue |= BIT6;
5925 }
5926
5927 usc_OutReg( info, RMR, RegValue );
5928
5929
5930 /* Set IRQ trigger level */
5931
5932 usc_RCmd( info, RCmd_SelectRicrIntLevel );
5933
5934
5935 /* Receive Interrupt Control Register (RICR)
5936 *
5937 * <15..8> ? RxFIFO IRQ Request Level
5938 *
5939 * Note: For async mode the receive FIFO level must be set
5940 * to 0 to avoid the situation where the FIFO contains fewer bytes
5941 * than the trigger level and no more data is expected.
5942 *
5943 * <7> 0 Exited Hunt IA (Interrupt Arm)
5944 * <6> 0 Idle Received IA
5945 * <5> 0 Break/Abort IA
5946 * <4> 0 Rx Bound IA
5947 * <3> 0 Queued status reflects oldest byte in FIFO
5948 * <2> 0 Abort/PE IA
5949 * <1> 0 Rx Overrun IA
5950 * <0> 0 Select TC0 value for readback
5951 *
5952 * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
5953 */
5954
5955 usc_OutReg( info, RICR, 0x0000 );
5956
5957 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5958 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
5959
5960
5961 /* Transmit mode Register (TMR)
5962 *
5963 * <15..13> 000 encoding = None
5964 * <12..08> 00000 reserved (Sync Only)
5965 * <7..6> 00 Transmit parity Even
5966 * <5> 0 Transmit parity Disabled
5967 * <4..2> 000 Tx Char Length = 8 bits
5968 * <1..0> 00 Disable Transmitter
5969 *
5970 * 0000 0000 0000 0000 = 0x0
5971 */
5972
5973 RegValue = 0;
5974
5975 if ( info->params.data_bits != 8 )
5976 RegValue |= BIT4+BIT3+BIT2;
5977
5978 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5979 RegValue |= BIT5;
5980 if ( info->params.parity != ASYNC_PARITY_ODD )
5981 RegValue |= BIT6;
5982 }
5983
5984 usc_OutReg( info, TMR, RegValue );
5985
5986 usc_set_txidle( info );
5987
5988
5989 /* Set IRQ trigger level */
5990
5991 usc_TCmd( info, TCmd_SelectTicrIntLevel );
5992
5993
5994 /* Transmit Interrupt Control Register (TICR)
5995 *
5996 * <15..8> ? Transmit FIFO IRQ Level
5997 * <7> 0 Present IA (Interrupt Arm)
5998 * <6> 1 Idle Sent IA
5999 * <5> 0 Abort Sent IA
6000 * <4> 0 EOF/EOM Sent IA
6001 * <3> 0 CRC Sent IA
6002 * <2> 0 1 = Wait for SW Trigger to Start Frame
6003 * <1> 0 Tx Underrun IA
6004 * <0> 0 TC0 constant on read back
6005 *
6006 * 0000 0000 0100 0000 = 0x0040
6007 */
6008
6009 usc_OutReg( info, TICR, 0x1f40 );
6010
6011 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
6012 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
6013
6014 usc_enable_async_clock( info, info->params.data_rate );
6015
6016
6017 /* Channel Control/status Register (CCSR)
6018 *
6019 * <15> X RCC FIFO Overflow status (RO)
6020 * <14> X RCC FIFO Not Empty status (RO)
6021 * <13> 0 1 = Clear RCC FIFO (WO)
6022 * <12> X DPLL in Sync status (RO)
6023 * <11> X DPLL 2 Missed Clocks status (RO)
6024 * <10> X DPLL 1 Missed Clock status (RO)
6025 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
6026 * <7> X SDLC Loop On status (RO)
6027 * <6> X SDLC Loop Send status (RO)
6028 * <5> 1 Bypass counters for TxClk and RxClk (RW)
6029 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
6030 * <1..0> 00 reserved
6031 *
6032 * 0000 0000 0010 0000 = 0x0020
6033 */
6034
6035 usc_OutReg( info, CCSR, 0x0020 );
6036
6037 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6038 RECEIVE_DATA + RECEIVE_STATUS );
6039
6040 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6041 RECEIVE_DATA + RECEIVE_STATUS );
6042
6043 usc_EnableMasterIrqBit( info );
6044
6045 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6046 /* Enable INTEN (Port 6, Bit12) */
6047 /* This connects the IRQ request signal to the ISA bus */
6048 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6049 }
6050
6051 if (info->params.loopback) {
6052 info->loopback_bits = 0x300;
6053 outw(0x0300, info->io_base + CCAR);
6054 }
6055
6056} /* end of usc_set_async_mode() */
6057
6058/* usc_loopback_frame()
6059 *
6060 * Loop back a small (2 byte) dummy SDLC frame.
6061 * Interrupts and DMA are NOT used. The purpose of this is to
6062 * clear any 'stale' status info left over from running in async mode.
6063 *
6064 * The 16C32 shows the strange behaviour of marking the 1st
6065 * received SDLC frame with a CRC error even when there is no
6066 * CRC error. To get around this a small dummy from of 2 bytes
6067 * is looped back when switching from async to sync mode.
6068 *
6069 * Arguments: info pointer to device instance data
6070 * Return Value: None
6071 */
6072static void usc_loopback_frame( struct mgsl_struct *info )
6073{
6074 int i;
6075 unsigned long oldmode = info->params.mode;
6076
6077 info->params.mode = MGSL_MODE_HDLC;
6078
6079 usc_DisableMasterIrqBit( info );
6080
6081 usc_set_sdlc_mode( info );
6082 usc_enable_loopback( info, 1 );
6083
6084 /* Write 16-bit Time Constant for BRG0 */
6085 usc_OutReg( info, TC0R, 0 );
6086
6087 /* Channel Control Register (CCR)
6088 *
6089 * <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
6090 * <13> 0 Trigger Tx on SW Command Disabled
6091 * <12> 0 Flag Preamble Disabled
6092 * <11..10> 00 Preamble Length = 8-Bits
6093 * <9..8> 01 Preamble Pattern = flags
6094 * <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
6095 * <5> 0 Trigger Rx on SW Command Disabled
6096 * <4..0> 0 reserved
6097 *
6098 * 0000 0001 0000 0000 = 0x0100
6099 */
6100
6101 usc_OutReg( info, CCR, 0x0100 );
6102
6103 /* SETUP RECEIVER */
6104 usc_RTCmd( info, RTCmd_PurgeRxFifo );
6105 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
6106
6107 /* SETUP TRANSMITTER */
6108 /* Program the Transmit Character Length Register (TCLR) */
6109 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
6110 usc_OutReg( info, TCLR, 2 );
6111 usc_RTCmd( info, RTCmd_PurgeTxFifo );
6112
6113 /* unlatch Tx status bits, and start transmit channel. */
6114 usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
6115 outw(0,info->io_base + DATAREG);
6116
6117 /* ENABLE TRANSMITTER */
6118 usc_TCmd( info, TCmd_SendFrame );
6119 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
6120
6121 /* WAIT FOR RECEIVE COMPLETE */
6122 for (i=0 ; i<1000 ; i++)
6123 if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
6124 break;
6125
6126 /* clear Internal Data loopback mode */
6127 usc_enable_loopback(info, 0);
6128
6129 usc_EnableMasterIrqBit(info);
6130
6131 info->params.mode = oldmode;
6132
6133} /* end of usc_loopback_frame() */
6134
6135/* usc_set_sync_mode() Programs the USC for SDLC communications.
6136 *
6137 * Arguments: info pointer to adapter info structure
6138 * Return Value: None
6139 */
6140static void usc_set_sync_mode( struct mgsl_struct *info )
6141{
6142 usc_loopback_frame( info );
6143 usc_set_sdlc_mode( info );
6144
6145 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6146 /* Enable INTEN (Port 6, Bit12) */
6147 /* This connects the IRQ request signal to the ISA bus */
6148 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6149 }
6150
6151 usc_enable_aux_clock(info, info->params.clock_speed);
6152
6153 if (info->params.loopback)
6154 usc_enable_loopback(info,1);
6155
6156} /* end of mgsl_set_sync_mode() */
6157
6158/* usc_set_txidle() Set the HDLC idle mode for the transmitter.
6159 *
6160 * Arguments: info pointer to device instance data
6161 * Return Value: None
6162 */
6163static void usc_set_txidle( struct mgsl_struct *info )
6164{
6165 u16 usc_idle_mode = IDLEMODE_FLAGS;
6166
6167 /* Map API idle mode to USC register bits */
6168
6169 switch( info->idle_mode ){
6170 case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
6171 case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
6172 case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
6173 case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
6174 case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
6175 case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
6176 case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
6177 }
6178
6179 info->usc_idle_mode = usc_idle_mode;
6180 //usc_OutReg(info, TCSR, usc_idle_mode);
6181 info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
6182 info->tcsr_value += usc_idle_mode;
6183 usc_OutReg(info, TCSR, info->tcsr_value);
6184
6185 /*
6186 * if SyncLink WAN adapter is running in external sync mode, the
6187 * transmitter has been set to Monosync in order to try to mimic
6188 * a true raw outbound bit stream. Monosync still sends an open/close
6189 * sync char at the start/end of a frame. Try to match those sync
6190 * patterns to the idle mode set here
6191 */
6192 if ( info->params.mode == MGSL_MODE_RAW ) {
6193 unsigned char syncpat = 0;
6194 switch( info->idle_mode ) {
6195 case HDLC_TXIDLE_FLAGS:
6196 syncpat = 0x7e;
6197 break;
6198 case HDLC_TXIDLE_ALT_ZEROS_ONES:
6199 syncpat = 0x55;
6200 break;
6201 case HDLC_TXIDLE_ZEROS:
6202 case HDLC_TXIDLE_SPACE:
6203 syncpat = 0x00;
6204 break;
6205 case HDLC_TXIDLE_ONES:
6206 case HDLC_TXIDLE_MARK:
6207 syncpat = 0xff;
6208 break;
6209 case HDLC_TXIDLE_ALT_MARK_SPACE:
6210 syncpat = 0xaa;
6211 break;
6212 }
6213
6214 usc_SetTransmitSyncChars(info,syncpat,syncpat);
6215 }
6216
6217} /* end of usc_set_txidle() */
6218
6219/* usc_get_serial_signals()
6220 *
6221 * Query the adapter for the state of the V24 status (input) signals.
6222 *
6223 * Arguments: info pointer to device instance data
6224 * Return Value: None
6225 */
6226static void usc_get_serial_signals( struct mgsl_struct *info )
6227{
6228 u16 status;
6229
6230 /* clear all serial signals except DTR and RTS */
6231 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
6232
6233 /* Read the Misc Interrupt status Register (MISR) to get */
6234 /* the V24 status signals. */
6235
6236 status = usc_InReg( info, MISR );
6237
6238 /* set serial signal bits to reflect MISR */
6239
6240 if ( status & MISCSTATUS_CTS )
6241 info->serial_signals |= SerialSignal_CTS;
6242
6243 if ( status & MISCSTATUS_DCD )
6244 info->serial_signals |= SerialSignal_DCD;
6245
6246 if ( status & MISCSTATUS_RI )
6247 info->serial_signals |= SerialSignal_RI;
6248
6249 if ( status & MISCSTATUS_DSR )
6250 info->serial_signals |= SerialSignal_DSR;
6251
6252} /* end of usc_get_serial_signals() */
6253
6254/* usc_set_serial_signals()
6255 *
6256 * Set the state of DTR and RTS based on contents of
6257 * serial_signals member of device extension.
6258 *
6259 * Arguments: info pointer to device instance data
6260 * Return Value: None
6261 */
6262static void usc_set_serial_signals( struct mgsl_struct *info )
6263{
6264 u16 Control;
6265 unsigned char V24Out = info->serial_signals;
6266
6267 /* get the current value of the Port Control Register (PCR) */
6268
6269 Control = usc_InReg( info, PCR );
6270
6271 if ( V24Out & SerialSignal_RTS )
6272 Control &= ~(BIT6);
6273 else
6274 Control |= BIT6;
6275
6276 if ( V24Out & SerialSignal_DTR )
6277 Control &= ~(BIT4);
6278 else
6279 Control |= BIT4;
6280
6281 usc_OutReg( info, PCR, Control );
6282
6283} /* end of usc_set_serial_signals() */
6284
6285/* usc_enable_async_clock()
6286 *
6287 * Enable the async clock at the specified frequency.
6288 *
6289 * Arguments: info pointer to device instance data
6290 * data_rate data rate of clock in bps
6291 * 0 disables the AUX clock.
6292 * Return Value: None
6293 */
6294static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
6295{
6296 if ( data_rate ) {
6297 /*
6298 * Clock mode Control Register (CMCR)
6299 *
6300 * <15..14> 00 counter 1 Disabled
6301 * <13..12> 00 counter 0 Disabled
6302 * <11..10> 11 BRG1 Input is TxC Pin
6303 * <9..8> 11 BRG0 Input is TxC Pin
6304 * <7..6> 01 DPLL Input is BRG1 Output
6305 * <5..3> 100 TxCLK comes from BRG0
6306 * <2..0> 100 RxCLK comes from BRG0
6307 *
6308 * 0000 1111 0110 0100 = 0x0f64
6309 */
6310
6311 usc_OutReg( info, CMCR, 0x0f64 );
6312
6313
6314 /*
6315 * Write 16-bit Time Constant for BRG0
6316 * Time Constant = (ClkSpeed / data_rate) - 1
6317 * ClkSpeed = 921600 (ISA), 691200 (PCI)
6318 */
6319
6320 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6321 usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
6322 else
6323 usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
6324
6325
6326 /*
6327 * Hardware Configuration Register (HCR)
6328 * Clear Bit 1, BRG0 mode = Continuous
6329 * Set Bit 0 to enable BRG0.
6330 */
6331
6332 usc_OutReg( info, HCR,
6333 (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
6334
6335
6336 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
6337
6338 usc_OutReg( info, IOCR,
6339 (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
6340 } else {
6341 /* data rate == 0 so turn off BRG0 */
6342 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
6343 }
6344
6345} /* end of usc_enable_async_clock() */
6346
6347/*
6348 * Buffer Structures:
6349 *
6350 * Normal memory access uses virtual addresses that can make discontiguous
6351 * physical memory pages appear to be contiguous in the virtual address
6352 * space (the processors memory mapping handles the conversions).
6353 *
6354 * DMA transfers require physically contiguous memory. This is because
6355 * the DMA system controller and DMA bus masters deal with memory using
6356 * only physical addresses.
6357 *
6358 * This causes a problem under Windows NT when large DMA buffers are
6359 * needed. Fragmentation of the nonpaged pool prevents allocations of
6360 * physically contiguous buffers larger than the PAGE_SIZE.
6361 *
6362 * However the 16C32 supports Bus Master Scatter/Gather DMA which
6363 * allows DMA transfers to physically discontiguous buffers. Information
6364 * about each data transfer buffer is contained in a memory structure
6365 * called a 'buffer entry'. A list of buffer entries is maintained
6366 * to track and control the use of the data transfer buffers.
6367 *
6368 * To support this strategy we will allocate sufficient PAGE_SIZE
6369 * contiguous memory buffers to allow for the total required buffer
6370 * space.
6371 *
6372 * The 16C32 accesses the list of buffer entries using Bus Master
6373 * DMA. Control information is read from the buffer entries by the
6374 * 16C32 to control data transfers. status information is written to
6375 * the buffer entries by the 16C32 to indicate the status of completed
6376 * transfers.
6377 *
6378 * The CPU writes control information to the buffer entries to control
6379 * the 16C32 and reads status information from the buffer entries to
6380 * determine information about received and transmitted frames.
6381 *
6382 * Because the CPU and 16C32 (adapter) both need simultaneous access
6383 * to the buffer entries, the buffer entry memory is allocated with
6384 * HalAllocateCommonBuffer(). This restricts the size of the buffer
6385 * entry list to PAGE_SIZE.
6386 *
6387 * The actual data buffers on the other hand will only be accessed
6388 * by the CPU or the adapter but not by both simultaneously. This allows
6389 * Scatter/Gather packet based DMA procedures for using physically
6390 * discontiguous pages.
6391 */
6392
6393/*
6394 * mgsl_reset_tx_dma_buffers()
6395 *
6396 * Set the count for all transmit buffers to 0 to indicate the
6397 * buffer is available for use and set the current buffer to the
6398 * first buffer. This effectively makes all buffers free and
6399 * discards any data in buffers.
6400 *
6401 * Arguments: info pointer to device instance data
6402 * Return Value: None
6403 */
6404static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
6405{
6406 unsigned int i;
6407
6408 for ( i = 0; i < info->tx_buffer_count; i++ ) {
6409 *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
6410 }
6411
6412 info->current_tx_buffer = 0;
6413 info->start_tx_dma_buffer = 0;
6414 info->tx_dma_buffers_used = 0;
6415
6416 info->get_tx_holding_index = 0;
6417 info->put_tx_holding_index = 0;
6418 info->tx_holding_count = 0;
6419
6420} /* end of mgsl_reset_tx_dma_buffers() */
6421
6422/*
6423 * num_free_tx_dma_buffers()
6424 *
6425 * returns the number of free tx dma buffers available
6426 *
6427 * Arguments: info pointer to device instance data
6428 * Return Value: number of free tx dma buffers
6429 */
6430static int num_free_tx_dma_buffers(struct mgsl_struct *info)
6431{
6432 return info->tx_buffer_count - info->tx_dma_buffers_used;
6433}
6434
6435/*
6436 * mgsl_reset_rx_dma_buffers()
6437 *
6438 * Set the count for all receive buffers to DMABUFFERSIZE
6439 * and set the current buffer to the first buffer. This effectively
6440 * makes all buffers free and discards any data in buffers.
6441 *
6442 * Arguments: info pointer to device instance data
6443 * Return Value: None
6444 */
6445static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
6446{
6447 unsigned int i;
6448
6449 for ( i = 0; i < info->rx_buffer_count; i++ ) {
6450 *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
6451// info->rx_buffer_list[i].count = DMABUFFERSIZE;
6452// info->rx_buffer_list[i].status = 0;
6453 }
6454
6455 info->current_rx_buffer = 0;
6456
6457} /* end of mgsl_reset_rx_dma_buffers() */
6458
6459/*
6460 * mgsl_free_rx_frame_buffers()
6461 *
6462 * Free the receive buffers used by a received SDLC
6463 * frame such that the buffers can be reused.
6464 *
6465 * Arguments:
6466 *
6467 * info pointer to device instance data
6468 * StartIndex index of 1st receive buffer of frame
6469 * EndIndex index of last receive buffer of frame
6470 *
6471 * Return Value: None
6472 */
6473static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
6474{
6475 bool Done = false;
6476 DMABUFFERENTRY *pBufEntry;
6477 unsigned int Index;
6478
6479 /* Starting with 1st buffer entry of the frame clear the status */
6480 /* field and set the count field to DMA Buffer Size. */
6481
6482 Index = StartIndex;
6483
6484 while( !Done ) {
6485 pBufEntry = &(info->rx_buffer_list[Index]);
6486
6487 if ( Index == EndIndex ) {
6488 /* This is the last buffer of the frame! */
6489 Done = true;
6490 }
6491
6492 /* reset current buffer for reuse */
6493// pBufEntry->status = 0;
6494// pBufEntry->count = DMABUFFERSIZE;
6495 *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
6496
6497 /* advance to next buffer entry in linked list */
6498 Index++;
6499 if ( Index == info->rx_buffer_count )
6500 Index = 0;
6501 }
6502
6503 /* set current buffer to next buffer after last buffer of frame */
6504 info->current_rx_buffer = Index;
6505
6506} /* end of free_rx_frame_buffers() */
6507
6508/* mgsl_get_rx_frame()
6509 *
6510 * This function attempts to return a received SDLC frame from the
6511 * receive DMA buffers. Only frames received without errors are returned.
6512 *
6513 * Arguments: info pointer to device extension
6514 * Return Value: true if frame returned, otherwise false
6515 */
6516static bool mgsl_get_rx_frame(struct mgsl_struct *info)
6517{
6518 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
6519 unsigned short status;
6520 DMABUFFERENTRY *pBufEntry;
6521 unsigned int framesize = 0;
6522 bool ReturnCode = false;
6523 unsigned long flags;
6524 struct tty_struct *tty = info->port.tty;
6525 bool return_frame = false;
6526
6527 /*
6528 * current_rx_buffer points to the 1st buffer of the next available
6529 * receive frame. To find the last buffer of the frame look for
6530 * a non-zero status field in the buffer entries. (The status
6531 * field is set by the 16C32 after completing a receive frame.
6532 */
6533
6534 StartIndex = EndIndex = info->current_rx_buffer;
6535
6536 while( !info->rx_buffer_list[EndIndex].status ) {
6537 /*
6538 * If the count field of the buffer entry is non-zero then
6539 * this buffer has not been used. (The 16C32 clears the count
6540 * field when it starts using the buffer.) If an unused buffer
6541 * is encountered then there are no frames available.
6542 */
6543
6544 if ( info->rx_buffer_list[EndIndex].count )
6545 goto Cleanup;
6546
6547 /* advance to next buffer entry in linked list */
6548 EndIndex++;
6549 if ( EndIndex == info->rx_buffer_count )
6550 EndIndex = 0;
6551
6552 /* if entire list searched then no frame available */
6553 if ( EndIndex == StartIndex ) {
6554 /* If this occurs then something bad happened,
6555 * all buffers have been 'used' but none mark
6556 * the end of a frame. Reset buffers and receiver.
6557 */
6558
6559 if ( info->rx_enabled ){
6560 spin_lock_irqsave(&info->irq_spinlock,flags);
6561 usc_start_receiver(info);
6562 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6563 }
6564 goto Cleanup;
6565 }
6566 }
6567
6568
6569 /* check status of receive frame */
6570
6571 status = info->rx_buffer_list[EndIndex].status;
6572
6573 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6574 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6575 if ( status & RXSTATUS_SHORT_FRAME )
6576 info->icount.rxshort++;
6577 else if ( status & RXSTATUS_ABORT )
6578 info->icount.rxabort++;
6579 else if ( status & RXSTATUS_OVERRUN )
6580 info->icount.rxover++;
6581 else {
6582 info->icount.rxcrc++;
6583 if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
6584 return_frame = true;
6585 }
6586 framesize = 0;
6587#if SYNCLINK_GENERIC_HDLC
6588 {
6589 info->netdev->stats.rx_errors++;
6590 info->netdev->stats.rx_frame_errors++;
6591 }
6592#endif
6593 } else
6594 return_frame = true;
6595
6596 if ( return_frame ) {
6597 /* receive frame has no errors, get frame size.
6598 * The frame size is the starting value of the RCC (which was
6599 * set to 0xffff) minus the ending value of the RCC (decremented
6600 * once for each receive character) minus 2 for the 16-bit CRC.
6601 */
6602
6603 framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
6604
6605 /* adjust frame size for CRC if any */
6606 if ( info->params.crc_type == HDLC_CRC_16_CCITT )
6607 framesize -= 2;
6608 else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
6609 framesize -= 4;
6610 }
6611
6612 if ( debug_level >= DEBUG_LEVEL_BH )
6613 printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
6614 __FILE__,__LINE__,info->device_name,status,framesize);
6615
6616 if ( debug_level >= DEBUG_LEVEL_DATA )
6617 mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
6618 min_t(int, framesize, DMABUFFERSIZE),0);
6619
6620 if (framesize) {
6621 if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
6622 ((framesize+1) > info->max_frame_size) ) ||
6623 (framesize > info->max_frame_size) )
6624 info->icount.rxlong++;
6625 else {
6626 /* copy dma buffer(s) to contiguous intermediate buffer */
6627 int copy_count = framesize;
6628 int index = StartIndex;
6629 unsigned char *ptmp = info->intermediate_rxbuffer;
6630
6631 if ( !(status & RXSTATUS_CRC_ERROR))
6632 info->icount.rxok++;
6633
6634 while(copy_count) {
6635 int partial_count;
6636 if ( copy_count > DMABUFFERSIZE )
6637 partial_count = DMABUFFERSIZE;
6638 else
6639 partial_count = copy_count;
6640
6641 pBufEntry = &(info->rx_buffer_list[index]);
6642 memcpy( ptmp, pBufEntry->virt_addr, partial_count );
6643 ptmp += partial_count;
6644 copy_count -= partial_count;
6645
6646 if ( ++index == info->rx_buffer_count )
6647 index = 0;
6648 }
6649
6650 if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
6651 ++framesize;
6652 *ptmp = (status & RXSTATUS_CRC_ERROR ?
6653 RX_CRC_ERROR :
6654 RX_OK);
6655
6656 if ( debug_level >= DEBUG_LEVEL_DATA )
6657 printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
6658 __FILE__,__LINE__,info->device_name,
6659 *ptmp);
6660 }
6661
6662#if SYNCLINK_GENERIC_HDLC
6663 if (info->netcount)
6664 hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
6665 else
6666#endif
6667 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6668 }
6669 }
6670 /* Free the buffers used by this frame. */
6671 mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
6672
6673 ReturnCode = true;
6674
6675Cleanup:
6676
6677 if ( info->rx_enabled && info->rx_overflow ) {
6678 /* The receiver needs to restarted because of
6679 * a receive overflow (buffer or FIFO). If the
6680 * receive buffers are now empty, then restart receiver.
6681 */
6682
6683 if ( !info->rx_buffer_list[EndIndex].status &&
6684 info->rx_buffer_list[EndIndex].count ) {
6685 spin_lock_irqsave(&info->irq_spinlock,flags);
6686 usc_start_receiver(info);
6687 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6688 }
6689 }
6690
6691 return ReturnCode;
6692
6693} /* end of mgsl_get_rx_frame() */
6694
6695/* mgsl_get_raw_rx_frame()
6696 *
6697 * This function attempts to return a received frame from the
6698 * receive DMA buffers when running in external loop mode. In this mode,
6699 * we will return at most one DMABUFFERSIZE frame to the application.
6700 * The USC receiver is triggering off of DCD going active to start a new
6701 * frame, and DCD going inactive to terminate the frame (similar to
6702 * processing a closing flag character).
6703 *
6704 * In this routine, we will return DMABUFFERSIZE "chunks" at a time.
6705 * If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
6706 * status field and the RCC field will indicate the length of the
6707 * entire received frame. We take this RCC field and get the modulus
6708 * of RCC and DMABUFFERSIZE to determine if number of bytes in the
6709 * last Rx DMA buffer and return that last portion of the frame.
6710 *
6711 * Arguments: info pointer to device extension
6712 * Return Value: true if frame returned, otherwise false
6713 */
6714static bool mgsl_get_raw_rx_frame(struct mgsl_struct *info)
6715{
6716 unsigned int CurrentIndex, NextIndex;
6717 unsigned short status;
6718 DMABUFFERENTRY *pBufEntry;
6719 unsigned int framesize = 0;
6720 bool ReturnCode = false;
6721 unsigned long flags;
6722 struct tty_struct *tty = info->port.tty;
6723
6724 /*
6725 * current_rx_buffer points to the 1st buffer of the next available
6726 * receive frame. The status field is set by the 16C32 after
6727 * completing a receive frame. If the status field of this buffer
6728 * is zero, either the USC is still filling this buffer or this
6729 * is one of a series of buffers making up a received frame.
6730 *
6731 * If the count field of this buffer is zero, the USC is either
6732 * using this buffer or has used this buffer. Look at the count
6733 * field of the next buffer. If that next buffer's count is
6734 * non-zero, the USC is still actively using the current buffer.
6735 * Otherwise, if the next buffer's count field is zero, the
6736 * current buffer is complete and the USC is using the next
6737 * buffer.
6738 */
6739 CurrentIndex = NextIndex = info->current_rx_buffer;
6740 ++NextIndex;
6741 if ( NextIndex == info->rx_buffer_count )
6742 NextIndex = 0;
6743
6744 if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
6745 (info->rx_buffer_list[CurrentIndex].count == 0 &&
6746 info->rx_buffer_list[NextIndex].count == 0)) {
6747 /*
6748 * Either the status field of this dma buffer is non-zero
6749 * (indicating the last buffer of a receive frame) or the next
6750 * buffer is marked as in use -- implying this buffer is complete
6751 * and an intermediate buffer for this received frame.
6752 */
6753
6754 status = info->rx_buffer_list[CurrentIndex].status;
6755
6756 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6757 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6758 if ( status & RXSTATUS_SHORT_FRAME )
6759 info->icount.rxshort++;
6760 else if ( status & RXSTATUS_ABORT )
6761 info->icount.rxabort++;
6762 else if ( status & RXSTATUS_OVERRUN )
6763 info->icount.rxover++;
6764 else
6765 info->icount.rxcrc++;
6766 framesize = 0;
6767 } else {
6768 /*
6769 * A receive frame is available, get frame size and status.
6770 *
6771 * The frame size is the starting value of the RCC (which was
6772 * set to 0xffff) minus the ending value of the RCC (decremented
6773 * once for each receive character) minus 2 or 4 for the 16-bit
6774 * or 32-bit CRC.
6775 *
6776 * If the status field is zero, this is an intermediate buffer.
6777 * It's size is 4K.
6778 *
6779 * If the DMA Buffer Entry's Status field is non-zero, the
6780 * receive operation completed normally (ie: DCD dropped). The
6781 * RCC field is valid and holds the received frame size.
6782 * It is possible that the RCC field will be zero on a DMA buffer
6783 * entry with a non-zero status. This can occur if the total
6784 * frame size (number of bytes between the time DCD goes active
6785 * to the time DCD goes inactive) exceeds 65535 bytes. In this
6786 * case the 16C32 has underrun on the RCC count and appears to
6787 * stop updating this counter to let us know the actual received
6788 * frame size. If this happens (non-zero status and zero RCC),
6789 * simply return the entire RxDMA Buffer
6790 */
6791 if ( status ) {
6792 /*
6793 * In the event that the final RxDMA Buffer is
6794 * terminated with a non-zero status and the RCC
6795 * field is zero, we interpret this as the RCC
6796 * having underflowed (received frame > 65535 bytes).
6797 *
6798 * Signal the event to the user by passing back
6799 * a status of RxStatus_CrcError returning the full
6800 * buffer and let the app figure out what data is
6801 * actually valid
6802 */
6803 if ( info->rx_buffer_list[CurrentIndex].rcc )
6804 framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
6805 else
6806 framesize = DMABUFFERSIZE;
6807 }
6808 else
6809 framesize = DMABUFFERSIZE;
6810 }
6811
6812 if ( framesize > DMABUFFERSIZE ) {
6813 /*
6814 * if running in raw sync mode, ISR handler for
6815 * End Of Buffer events terminates all buffers at 4K.
6816 * If this frame size is said to be >4K, get the
6817 * actual number of bytes of the frame in this buffer.
6818 */
6819 framesize = framesize % DMABUFFERSIZE;
6820 }
6821
6822
6823 if ( debug_level >= DEBUG_LEVEL_BH )
6824 printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
6825 __FILE__,__LINE__,info->device_name,status,framesize);
6826
6827 if ( debug_level >= DEBUG_LEVEL_DATA )
6828 mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
6829 min_t(int, framesize, DMABUFFERSIZE),0);
6830
6831 if (framesize) {
6832 /* copy dma buffer(s) to contiguous intermediate buffer */
6833 /* NOTE: we never copy more than DMABUFFERSIZE bytes */
6834
6835 pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
6836 memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
6837 info->icount.rxok++;
6838
6839 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6840 }
6841
6842 /* Free the buffers used by this frame. */
6843 mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
6844
6845 ReturnCode = true;
6846 }
6847
6848
6849 if ( info->rx_enabled && info->rx_overflow ) {
6850 /* The receiver needs to restarted because of
6851 * a receive overflow (buffer or FIFO). If the
6852 * receive buffers are now empty, then restart receiver.
6853 */
6854
6855 if ( !info->rx_buffer_list[CurrentIndex].status &&
6856 info->rx_buffer_list[CurrentIndex].count ) {
6857 spin_lock_irqsave(&info->irq_spinlock,flags);
6858 usc_start_receiver(info);
6859 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6860 }
6861 }
6862
6863 return ReturnCode;
6864
6865} /* end of mgsl_get_raw_rx_frame() */
6866
6867/* mgsl_load_tx_dma_buffer()
6868 *
6869 * Load the transmit DMA buffer with the specified data.
6870 *
6871 * Arguments:
6872 *
6873 * info pointer to device extension
6874 * Buffer pointer to buffer containing frame to load
6875 * BufferSize size in bytes of frame in Buffer
6876 *
6877 * Return Value: None
6878 */
6879static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
6880 const char *Buffer, unsigned int BufferSize)
6881{
6882 unsigned short Copycount;
6883 unsigned int i = 0;
6884 DMABUFFERENTRY *pBufEntry;
6885
6886 if ( debug_level >= DEBUG_LEVEL_DATA )
6887 mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
6888
6889 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
6890 /* set CMR:13 to start transmit when
6891 * next GoAhead (abort) is received
6892 */
6893 info->cmr_value |= BIT13;
6894 }
6895
6896 /* begin loading the frame in the next available tx dma
6897 * buffer, remember it's starting location for setting
6898 * up tx dma operation
6899 */
6900 i = info->current_tx_buffer;
6901 info->start_tx_dma_buffer = i;
6902
6903 /* Setup the status and RCC (Frame Size) fields of the 1st */
6904 /* buffer entry in the transmit DMA buffer list. */
6905
6906 info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
6907 info->tx_buffer_list[i].rcc = BufferSize;
6908 info->tx_buffer_list[i].count = BufferSize;
6909
6910 /* Copy frame data from 1st source buffer to the DMA buffers. */
6911 /* The frame data may span multiple DMA buffers. */
6912
6913 while( BufferSize ){
6914 /* Get a pointer to next DMA buffer entry. */
6915 pBufEntry = &info->tx_buffer_list[i++];
6916
6917 if ( i == info->tx_buffer_count )
6918 i=0;
6919
6920 /* Calculate the number of bytes that can be copied from */
6921 /* the source buffer to this DMA buffer. */
6922 if ( BufferSize > DMABUFFERSIZE )
6923 Copycount = DMABUFFERSIZE;
6924 else
6925 Copycount = BufferSize;
6926
6927 /* Actually copy data from source buffer to DMA buffer. */
6928 /* Also set the data count for this individual DMA buffer. */
6929 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6930 mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
6931 else
6932 memcpy(pBufEntry->virt_addr, Buffer, Copycount);
6933
6934 pBufEntry->count = Copycount;
6935
6936 /* Advance source pointer and reduce remaining data count. */
6937 Buffer += Copycount;
6938 BufferSize -= Copycount;
6939
6940 ++info->tx_dma_buffers_used;
6941 }
6942
6943 /* remember next available tx dma buffer */
6944 info->current_tx_buffer = i;
6945
6946} /* end of mgsl_load_tx_dma_buffer() */
6947
6948/*
6949 * mgsl_register_test()
6950 *
6951 * Performs a register test of the 16C32.
6952 *
6953 * Arguments: info pointer to device instance data
6954 * Return Value: true if test passed, otherwise false
6955 */
6956static bool mgsl_register_test( struct mgsl_struct *info )
6957{
6958 static unsigned short BitPatterns[] =
6959 { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
6960 static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
6961 unsigned int i;
6962 bool rc = true;
6963 unsigned long flags;
6964
6965 spin_lock_irqsave(&info->irq_spinlock,flags);
6966 usc_reset(info);
6967
6968 /* Verify the reset state of some registers. */
6969
6970 if ( (usc_InReg( info, SICR ) != 0) ||
6971 (usc_InReg( info, IVR ) != 0) ||
6972 (usc_InDmaReg( info, DIVR ) != 0) ){
6973 rc = false;
6974 }
6975
6976 if ( rc ){
6977 /* Write bit patterns to various registers but do it out of */
6978 /* sync, then read back and verify values. */
6979
6980 for ( i = 0 ; i < Patterncount ; i++ ) {
6981 usc_OutReg( info, TC0R, BitPatterns[i] );
6982 usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
6983 usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
6984 usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
6985 usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
6986 usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
6987
6988 if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
6989 (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
6990 (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
6991 (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
6992 (usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
6993 (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
6994 rc = false;
6995 break;
6996 }
6997 }
6998 }
6999
7000 usc_reset(info);
7001 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7002
7003 return rc;
7004
7005} /* end of mgsl_register_test() */
7006
7007/* mgsl_irq_test() Perform interrupt test of the 16C32.
7008 *
7009 * Arguments: info pointer to device instance data
7010 * Return Value: true if test passed, otherwise false
7011 */
7012static bool mgsl_irq_test( struct mgsl_struct *info )
7013{
7014 unsigned long EndTime;
7015 unsigned long flags;
7016
7017 spin_lock_irqsave(&info->irq_spinlock,flags);
7018 usc_reset(info);
7019
7020 /*
7021 * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
7022 * The ISR sets irq_occurred to true.
7023 */
7024
7025 info->irq_occurred = false;
7026
7027 /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
7028 /* Enable INTEN (Port 6, Bit12) */
7029 /* This connects the IRQ request signal to the ISA bus */
7030 /* on the ISA adapter. This has no effect for the PCI adapter */
7031 usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
7032
7033 usc_EnableMasterIrqBit(info);
7034 usc_EnableInterrupts(info, IO_PIN);
7035 usc_ClearIrqPendingBits(info, IO_PIN);
7036
7037 usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
7038 usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
7039
7040 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7041
7042 EndTime=100;
7043 while( EndTime-- && !info->irq_occurred ) {
7044 msleep_interruptible(10);
7045 }
7046
7047 spin_lock_irqsave(&info->irq_spinlock,flags);
7048 usc_reset(info);
7049 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7050
7051 return info->irq_occurred;
7052
7053} /* end of mgsl_irq_test() */
7054
7055/* mgsl_dma_test()
7056 *
7057 * Perform a DMA test of the 16C32. A small frame is
7058 * transmitted via DMA from a transmit buffer to a receive buffer
7059 * using single buffer DMA mode.
7060 *
7061 * Arguments: info pointer to device instance data
7062 * Return Value: true if test passed, otherwise false
7063 */
7064static bool mgsl_dma_test( struct mgsl_struct *info )
7065{
7066 unsigned short FifoLevel;
7067 unsigned long phys_addr;
7068 unsigned int FrameSize;
7069 unsigned int i;
7070 char *TmpPtr;
7071 bool rc = true;
7072 unsigned short status=0;
7073 unsigned long EndTime;
7074 unsigned long flags;
7075 MGSL_PARAMS tmp_params;
7076
7077 /* save current port options */
7078 memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
7079 /* load default port options */
7080 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
7081
7082#define TESTFRAMESIZE 40
7083
7084 spin_lock_irqsave(&info->irq_spinlock,flags);
7085
7086 /* setup 16C32 for SDLC DMA transfer mode */
7087
7088 usc_reset(info);
7089 usc_set_sdlc_mode(info);
7090 usc_enable_loopback(info,1);
7091
7092 /* Reprogram the RDMR so that the 16C32 does NOT clear the count
7093 * field of the buffer entry after fetching buffer address. This
7094 * way we can detect a DMA failure for a DMA read (which should be
7095 * non-destructive to system memory) before we try and write to
7096 * memory (where a failure could corrupt system memory).
7097 */
7098
7099 /* Receive DMA mode Register (RDMR)
7100 *
7101 * <15..14> 11 DMA mode = Linked List Buffer mode
7102 * <13> 1 RSBinA/L = store Rx status Block in List entry
7103 * <12> 0 1 = Clear count of List Entry after fetching
7104 * <11..10> 00 Address mode = Increment
7105 * <9> 1 Terminate Buffer on RxBound
7106 * <8> 0 Bus Width = 16bits
7107 * <7..0> ? status Bits (write as 0s)
7108 *
7109 * 1110 0010 0000 0000 = 0xe200
7110 */
7111
7112 usc_OutDmaReg( info, RDMR, 0xe200 );
7113
7114 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7115
7116
7117 /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
7118
7119 FrameSize = TESTFRAMESIZE;
7120
7121 /* setup 1st transmit buffer entry: */
7122 /* with frame size and transmit control word */
7123
7124 info->tx_buffer_list[0].count = FrameSize;
7125 info->tx_buffer_list[0].rcc = FrameSize;
7126 info->tx_buffer_list[0].status = 0x4000;
7127
7128 /* build a transmit frame in 1st transmit DMA buffer */
7129
7130 TmpPtr = info->tx_buffer_list[0].virt_addr;
7131 for (i = 0; i < FrameSize; i++ )
7132 *TmpPtr++ = i;
7133
7134 /* setup 1st receive buffer entry: */
7135 /* clear status, set max receive buffer size */
7136
7137 info->rx_buffer_list[0].status = 0;
7138 info->rx_buffer_list[0].count = FrameSize + 4;
7139
7140 /* zero out the 1st receive buffer */
7141
7142 memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
7143
7144 /* Set count field of next buffer entries to prevent */
7145 /* 16C32 from using buffers after the 1st one. */
7146
7147 info->tx_buffer_list[1].count = 0;
7148 info->rx_buffer_list[1].count = 0;
7149
7150
7151 /***************************/
7152 /* Program 16C32 receiver. */
7153 /***************************/
7154
7155 spin_lock_irqsave(&info->irq_spinlock,flags);
7156
7157 /* setup DMA transfers */
7158 usc_RTCmd( info, RTCmd_PurgeRxFifo );
7159
7160 /* program 16C32 receiver with physical address of 1st DMA buffer entry */
7161 phys_addr = info->rx_buffer_list[0].phys_entry;
7162 usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
7163 usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
7164
7165 /* Clear the Rx DMA status bits (read RDMR) and start channel */
7166 usc_InDmaReg( info, RDMR );
7167 usc_DmaCmd( info, DmaCmd_InitRxChannel );
7168
7169 /* Enable Receiver (RMR <1..0> = 10) */
7170 usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
7171
7172 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7173
7174
7175 /*************************************************************/
7176 /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
7177 /*************************************************************/
7178
7179 /* Wait 100ms for interrupt. */
7180 EndTime = jiffies + msecs_to_jiffies(100);
7181
7182 for(;;) {
7183 if (time_after(jiffies, EndTime)) {
7184 rc = false;
7185 break;
7186 }
7187
7188 spin_lock_irqsave(&info->irq_spinlock,flags);
7189 status = usc_InDmaReg( info, RDMR );
7190 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7191
7192 if ( !(status & BIT4) && (status & BIT5) ) {
7193 /* INITG (BIT 4) is inactive (no entry read in progress) AND */
7194 /* BUSY (BIT 5) is active (channel still active). */
7195 /* This means the buffer entry read has completed. */
7196 break;
7197 }
7198 }
7199
7200
7201 /******************************/
7202 /* Program 16C32 transmitter. */
7203 /******************************/
7204
7205 spin_lock_irqsave(&info->irq_spinlock,flags);
7206
7207 /* Program the Transmit Character Length Register (TCLR) */
7208 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
7209
7210 usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
7211 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7212
7213 /* Program the address of the 1st DMA Buffer Entry in linked list */
7214
7215 phys_addr = info->tx_buffer_list[0].phys_entry;
7216 usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
7217 usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
7218
7219 /* unlatch Tx status bits, and start transmit channel. */
7220
7221 usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
7222 usc_DmaCmd( info, DmaCmd_InitTxChannel );
7223
7224 /* wait for DMA controller to fill transmit FIFO */
7225
7226 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
7227
7228 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7229
7230
7231 /**********************************/
7232 /* WAIT FOR TRANSMIT FIFO TO FILL */
7233 /**********************************/
7234
7235 /* Wait 100ms */
7236 EndTime = jiffies + msecs_to_jiffies(100);
7237
7238 for(;;) {
7239 if (time_after(jiffies, EndTime)) {
7240 rc = false;
7241 break;
7242 }
7243
7244 spin_lock_irqsave(&info->irq_spinlock,flags);
7245 FifoLevel = usc_InReg(info, TICR) >> 8;
7246 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7247
7248 if ( FifoLevel < 16 )
7249 break;
7250 else
7251 if ( FrameSize < 32 ) {
7252 /* This frame is smaller than the entire transmit FIFO */
7253 /* so wait for the entire frame to be loaded. */
7254 if ( FifoLevel <= (32 - FrameSize) )
7255 break;
7256 }
7257 }
7258
7259
7260 if ( rc )
7261 {
7262 /* Enable 16C32 transmitter. */
7263
7264 spin_lock_irqsave(&info->irq_spinlock,flags);
7265
7266 /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
7267 usc_TCmd( info, TCmd_SendFrame );
7268 usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
7269
7270 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7271
7272
7273 /******************************/
7274 /* WAIT FOR TRANSMIT COMPLETE */
7275 /******************************/
7276
7277 /* Wait 100ms */
7278 EndTime = jiffies + msecs_to_jiffies(100);
7279
7280 /* While timer not expired wait for transmit complete */
7281
7282 spin_lock_irqsave(&info->irq_spinlock,flags);
7283 status = usc_InReg( info, TCSR );
7284 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7285
7286 while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
7287 if (time_after(jiffies, EndTime)) {
7288 rc = false;
7289 break;
7290 }
7291
7292 spin_lock_irqsave(&info->irq_spinlock,flags);
7293 status = usc_InReg( info, TCSR );
7294 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7295 }
7296 }
7297
7298
7299 if ( rc ){
7300 /* CHECK FOR TRANSMIT ERRORS */
7301 if ( status & (BIT5 + BIT1) )
7302 rc = false;
7303 }
7304
7305 if ( rc ) {
7306 /* WAIT FOR RECEIVE COMPLETE */
7307
7308 /* Wait 100ms */
7309 EndTime = jiffies + msecs_to_jiffies(100);
7310
7311 /* Wait for 16C32 to write receive status to buffer entry. */
7312 status=info->rx_buffer_list[0].status;
7313 while ( status == 0 ) {
7314 if (time_after(jiffies, EndTime)) {
7315 rc = false;
7316 break;
7317 }
7318 status=info->rx_buffer_list[0].status;
7319 }
7320 }
7321
7322
7323 if ( rc ) {
7324 /* CHECK FOR RECEIVE ERRORS */
7325 status = info->rx_buffer_list[0].status;
7326
7327 if ( status & (BIT8 + BIT3 + BIT1) ) {
7328 /* receive error has occurred */
7329 rc = false;
7330 } else {
7331 if ( memcmp( info->tx_buffer_list[0].virt_addr ,
7332 info->rx_buffer_list[0].virt_addr, FrameSize ) ){
7333 rc = false;
7334 }
7335 }
7336 }
7337
7338 spin_lock_irqsave(&info->irq_spinlock,flags);
7339 usc_reset( info );
7340 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7341
7342 /* restore current port options */
7343 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
7344
7345 return rc;
7346
7347} /* end of mgsl_dma_test() */
7348
7349/* mgsl_adapter_test()
7350 *
7351 * Perform the register, IRQ, and DMA tests for the 16C32.
7352 *
7353 * Arguments: info pointer to device instance data
7354 * Return Value: 0 if success, otherwise -ENODEV
7355 */
7356static int mgsl_adapter_test( struct mgsl_struct *info )
7357{
7358 if ( debug_level >= DEBUG_LEVEL_INFO )
7359 printk( "%s(%d):Testing device %s\n",
7360 __FILE__,__LINE__,info->device_name );
7361
7362 if ( !mgsl_register_test( info ) ) {
7363 info->init_error = DiagStatus_AddressFailure;
7364 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
7365 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
7366 return -ENODEV;
7367 }
7368
7369 if ( !mgsl_irq_test( info ) ) {
7370 info->init_error = DiagStatus_IrqFailure;
7371 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
7372 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
7373 return -ENODEV;
7374 }
7375
7376 if ( !mgsl_dma_test( info ) ) {
7377 info->init_error = DiagStatus_DmaFailure;
7378 printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
7379 __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
7380 return -ENODEV;
7381 }
7382
7383 if ( debug_level >= DEBUG_LEVEL_INFO )
7384 printk( "%s(%d):device %s passed diagnostics\n",
7385 __FILE__,__LINE__,info->device_name );
7386
7387 return 0;
7388
7389} /* end of mgsl_adapter_test() */
7390
7391/* mgsl_memory_test()
7392 *
7393 * Test the shared memory on a PCI adapter.
7394 *
7395 * Arguments: info pointer to device instance data
7396 * Return Value: true if test passed, otherwise false
7397 */
7398static bool mgsl_memory_test( struct mgsl_struct *info )
7399{
7400 static unsigned long BitPatterns[] =
7401 { 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
7402 unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
7403 unsigned long i;
7404 unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
7405 unsigned long * TestAddr;
7406
7407 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
7408 return true;
7409
7410 TestAddr = (unsigned long *)info->memory_base;
7411
7412 /* Test data lines with test pattern at one location. */
7413
7414 for ( i = 0 ; i < Patterncount ; i++ ) {
7415 *TestAddr = BitPatterns[i];
7416 if ( *TestAddr != BitPatterns[i] )
7417 return false;
7418 }
7419
7420 /* Test address lines with incrementing pattern over */
7421 /* entire address range. */
7422
7423 for ( i = 0 ; i < TestLimit ; i++ ) {
7424 *TestAddr = i * 4;
7425 TestAddr++;
7426 }
7427
7428 TestAddr = (unsigned long *)info->memory_base;
7429
7430 for ( i = 0 ; i < TestLimit ; i++ ) {
7431 if ( *TestAddr != i * 4 )
7432 return false;
7433 TestAddr++;
7434 }
7435
7436 memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
7437
7438 return true;
7439
7440} /* End Of mgsl_memory_test() */
7441
7442
7443/* mgsl_load_pci_memory()
7444 *
7445 * Load a large block of data into the PCI shared memory.
7446 * Use this instead of memcpy() or memmove() to move data
7447 * into the PCI shared memory.
7448 *
7449 * Notes:
7450 *
7451 * This function prevents the PCI9050 interface chip from hogging
7452 * the adapter local bus, which can starve the 16C32 by preventing
7453 * 16C32 bus master cycles.
7454 *
7455 * The PCI9050 documentation says that the 9050 will always release
7456 * control of the local bus after completing the current read
7457 * or write operation.
7458 *
7459 * It appears that as long as the PCI9050 write FIFO is full, the
7460 * PCI9050 treats all of the writes as a single burst transaction
7461 * and will not release the bus. This causes DMA latency problems
7462 * at high speeds when copying large data blocks to the shared
7463 * memory.
7464 *
7465 * This function in effect, breaks the a large shared memory write
7466 * into multiple transations by interleaving a shared memory read
7467 * which will flush the write FIFO and 'complete' the write
7468 * transation. This allows any pending DMA request to gain control
7469 * of the local bus in a timely fasion.
7470 *
7471 * Arguments:
7472 *
7473 * TargetPtr pointer to target address in PCI shared memory
7474 * SourcePtr pointer to source buffer for data
7475 * count count in bytes of data to copy
7476 *
7477 * Return Value: None
7478 */
7479static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
7480 unsigned short count )
7481{
7482 /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
7483#define PCI_LOAD_INTERVAL 64
7484
7485 unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
7486 unsigned short Index;
7487 unsigned long Dummy;
7488
7489 for ( Index = 0 ; Index < Intervalcount ; Index++ )
7490 {
7491 memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
7492 Dummy = *((volatile unsigned long *)TargetPtr);
7493 TargetPtr += PCI_LOAD_INTERVAL;
7494 SourcePtr += PCI_LOAD_INTERVAL;
7495 }
7496
7497 memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
7498
7499} /* End Of mgsl_load_pci_memory() */
7500
7501static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
7502{
7503 int i;
7504 int linecount;
7505 if (xmit)
7506 printk("%s tx data:\n",info->device_name);
7507 else
7508 printk("%s rx data:\n",info->device_name);
7509
7510 while(count) {
7511 if (count > 16)
7512 linecount = 16;
7513 else
7514 linecount = count;
7515
7516 for(i=0;i<linecount;i++)
7517 printk("%02X ",(unsigned char)data[i]);
7518 for(;i<17;i++)
7519 printk(" ");
7520 for(i=0;i<linecount;i++) {
7521 if (data[i]>=040 && data[i]<=0176)
7522 printk("%c",data[i]);
7523 else
7524 printk(".");
7525 }
7526 printk("\n");
7527
7528 data += linecount;
7529 count -= linecount;
7530 }
7531} /* end of mgsl_trace_block() */
7532
7533/* mgsl_tx_timeout()
7534 *
7535 * called when HDLC frame times out
7536 * update stats and do tx completion processing
7537 *
7538 * Arguments: context pointer to device instance data
7539 * Return Value: None
7540 */
7541static void mgsl_tx_timeout(unsigned long context)
7542{
7543 struct mgsl_struct *info = (struct mgsl_struct*)context;
7544 unsigned long flags;
7545
7546 if ( debug_level >= DEBUG_LEVEL_INFO )
7547 printk( "%s(%d):mgsl_tx_timeout(%s)\n",
7548 __FILE__,__LINE__,info->device_name);
7549 if(info->tx_active &&
7550 (info->params.mode == MGSL_MODE_HDLC ||
7551 info->params.mode == MGSL_MODE_RAW) ) {
7552 info->icount.txtimeout++;
7553 }
7554 spin_lock_irqsave(&info->irq_spinlock,flags);
7555 info->tx_active = false;
7556 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
7557
7558 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
7559 usc_loopmode_cancel_transmit( info );
7560
7561 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7562
7563#if SYNCLINK_GENERIC_HDLC
7564 if (info->netcount)
7565 hdlcdev_tx_done(info);
7566 else
7567#endif
7568 mgsl_bh_transmit(info);
7569
7570} /* end of mgsl_tx_timeout() */
7571
7572/* signal that there are no more frames to send, so that
7573 * line is 'released' by echoing RxD to TxD when current
7574 * transmission is complete (or immediately if no tx in progress).
7575 */
7576static int mgsl_loopmode_send_done( struct mgsl_struct * info )
7577{
7578 unsigned long flags;
7579
7580 spin_lock_irqsave(&info->irq_spinlock,flags);
7581 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
7582 if (info->tx_active)
7583 info->loopmode_send_done_requested = true;
7584 else
7585 usc_loopmode_send_done(info);
7586 }
7587 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7588
7589 return 0;
7590}
7591
7592/* release the line by echoing RxD to TxD
7593 * upon completion of a transmit frame
7594 */
7595static void usc_loopmode_send_done( struct mgsl_struct * info )
7596{
7597 info->loopmode_send_done_requested = false;
7598 /* clear CMR:13 to 0 to start echoing RxData to TxData */
7599 info->cmr_value &= ~BIT13;
7600 usc_OutReg(info, CMR, info->cmr_value);
7601}
7602
7603/* abort a transmit in progress while in HDLC LoopMode
7604 */
7605static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
7606{
7607 /* reset tx dma channel and purge TxFifo */
7608 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7609 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
7610 usc_loopmode_send_done( info );
7611}
7612
7613/* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
7614 * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
7615 * we must clear CMR:13 to begin repeating TxData to RxData
7616 */
7617static void usc_loopmode_insert_request( struct mgsl_struct * info )
7618{
7619 info->loopmode_insert_requested = true;
7620
7621 /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
7622 * begin repeating TxData on RxData (complete insertion)
7623 */
7624 usc_OutReg( info, RICR,
7625 (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
7626
7627 /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
7628 info->cmr_value |= BIT13;
7629 usc_OutReg(info, CMR, info->cmr_value);
7630}
7631
7632/* return 1 if station is inserted into the loop, otherwise 0
7633 */
7634static int usc_loopmode_active( struct mgsl_struct * info)
7635{
7636 return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
7637}
7638
7639#if SYNCLINK_GENERIC_HDLC
7640
7641/**
7642 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
7643 * set encoding and frame check sequence (FCS) options
7644 *
7645 * dev pointer to network device structure
7646 * encoding serial encoding setting
7647 * parity FCS setting
7648 *
7649 * returns 0 if success, otherwise error code
7650 */
7651static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
7652 unsigned short parity)
7653{
7654 struct mgsl_struct *info = dev_to_port(dev);
7655 unsigned char new_encoding;
7656 unsigned short new_crctype;
7657
7658 /* return error if TTY interface open */
7659 if (info->port.count)
7660 return -EBUSY;
7661
7662 switch (encoding)
7663 {
7664 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
7665 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
7666 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
7667 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
7668 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
7669 default: return -EINVAL;
7670 }
7671
7672 switch (parity)
7673 {
7674 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
7675 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
7676 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
7677 default: return -EINVAL;
7678 }
7679
7680 info->params.encoding = new_encoding;
7681 info->params.crc_type = new_crctype;
7682
7683 /* if network interface up, reprogram hardware */
7684 if (info->netcount)
7685 mgsl_program_hw(info);
7686
7687 return 0;
7688}
7689
7690/**
7691 * called by generic HDLC layer to send frame
7692 *
7693 * skb socket buffer containing HDLC frame
7694 * dev pointer to network device structure
7695 */
7696static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
7697 struct net_device *dev)
7698{
7699 struct mgsl_struct *info = dev_to_port(dev);
7700 unsigned long flags;
7701
7702 if (debug_level >= DEBUG_LEVEL_INFO)
7703 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
7704
7705 /* stop sending until this frame completes */
7706 netif_stop_queue(dev);
7707
7708 /* copy data to device buffers */
7709 info->xmit_cnt = skb->len;
7710 mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
7711
7712 /* update network statistics */
7713 dev->stats.tx_packets++;
7714 dev->stats.tx_bytes += skb->len;
7715
7716 /* done with socket buffer, so free it */
7717 dev_kfree_skb(skb);
7718
7719 /* save start time for transmit timeout detection */
7720 dev->trans_start = jiffies;
7721
7722 /* start hardware transmitter if necessary */
7723 spin_lock_irqsave(&info->irq_spinlock,flags);
7724 if (!info->tx_active)
7725 usc_start_transmitter(info);
7726 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7727
7728 return NETDEV_TX_OK;
7729}
7730
7731/**
7732 * called by network layer when interface enabled
7733 * claim resources and initialize hardware
7734 *
7735 * dev pointer to network device structure
7736 *
7737 * returns 0 if success, otherwise error code
7738 */
7739static int hdlcdev_open(struct net_device *dev)
7740{
7741 struct mgsl_struct *info = dev_to_port(dev);
7742 int rc;
7743 unsigned long flags;
7744
7745 if (debug_level >= DEBUG_LEVEL_INFO)
7746 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
7747
7748 /* generic HDLC layer open processing */
7749 if ((rc = hdlc_open(dev)))
7750 return rc;
7751
7752 /* arbitrate between network and tty opens */
7753 spin_lock_irqsave(&info->netlock, flags);
7754 if (info->port.count != 0 || info->netcount != 0) {
7755 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
7756 spin_unlock_irqrestore(&info->netlock, flags);
7757 return -EBUSY;
7758 }
7759 info->netcount=1;
7760 spin_unlock_irqrestore(&info->netlock, flags);
7761
7762 /* claim resources and init adapter */
7763 if ((rc = startup(info)) != 0) {
7764 spin_lock_irqsave(&info->netlock, flags);
7765 info->netcount=0;
7766 spin_unlock_irqrestore(&info->netlock, flags);
7767 return rc;
7768 }
7769
7770 /* assert DTR and RTS, apply hardware settings */
7771 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
7772 mgsl_program_hw(info);
7773
7774 /* enable network layer transmit */
7775 dev->trans_start = jiffies;
7776 netif_start_queue(dev);
7777
7778 /* inform generic HDLC layer of current DCD status */
7779 spin_lock_irqsave(&info->irq_spinlock, flags);
7780 usc_get_serial_signals(info);
7781 spin_unlock_irqrestore(&info->irq_spinlock, flags);
7782 if (info->serial_signals & SerialSignal_DCD)
7783 netif_carrier_on(dev);
7784 else
7785 netif_carrier_off(dev);
7786 return 0;
7787}
7788
7789/**
7790 * called by network layer when interface is disabled
7791 * shutdown hardware and release resources
7792 *
7793 * dev pointer to network device structure
7794 *
7795 * returns 0 if success, otherwise error code
7796 */
7797static int hdlcdev_close(struct net_device *dev)
7798{
7799 struct mgsl_struct *info = dev_to_port(dev);
7800 unsigned long flags;
7801
7802 if (debug_level >= DEBUG_LEVEL_INFO)
7803 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
7804
7805 netif_stop_queue(dev);
7806
7807 /* shutdown adapter and release resources */
7808 shutdown(info);
7809
7810 hdlc_close(dev);
7811
7812 spin_lock_irqsave(&info->netlock, flags);
7813 info->netcount=0;
7814 spin_unlock_irqrestore(&info->netlock, flags);
7815
7816 return 0;
7817}
7818
7819/**
7820 * called by network layer to process IOCTL call to network device
7821 *
7822 * dev pointer to network device structure
7823 * ifr pointer to network interface request structure
7824 * cmd IOCTL command code
7825 *
7826 * returns 0 if success, otherwise error code
7827 */
7828static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
7829{
7830 const size_t size = sizeof(sync_serial_settings);
7831 sync_serial_settings new_line;
7832 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
7833 struct mgsl_struct *info = dev_to_port(dev);
7834 unsigned int flags;
7835
7836 if (debug_level >= DEBUG_LEVEL_INFO)
7837 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
7838
7839 /* return error if TTY interface open */
7840 if (info->port.count)
7841 return -EBUSY;
7842
7843 if (cmd != SIOCWANDEV)
7844 return hdlc_ioctl(dev, ifr, cmd);
7845
7846 switch(ifr->ifr_settings.type) {
7847 case IF_GET_IFACE: /* return current sync_serial_settings */
7848
7849 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
7850 if (ifr->ifr_settings.size < size) {
7851 ifr->ifr_settings.size = size; /* data size wanted */
7852 return -ENOBUFS;
7853 }
7854
7855 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7856 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7857 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7858 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7859
7860 switch (flags){
7861 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
7862 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
7863 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
7864 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
7865 default: new_line.clock_type = CLOCK_DEFAULT;
7866 }
7867
7868 new_line.clock_rate = info->params.clock_speed;
7869 new_line.loopback = info->params.loopback ? 1:0;
7870
7871 if (copy_to_user(line, &new_line, size))
7872 return -EFAULT;
7873 return 0;
7874
7875 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
7876
7877 if(!capable(CAP_NET_ADMIN))
7878 return -EPERM;
7879 if (copy_from_user(&new_line, line, size))
7880 return -EFAULT;
7881
7882 switch (new_line.clock_type)
7883 {
7884 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
7885 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
7886 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
7887 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
7888 case CLOCK_DEFAULT: flags = info->params.flags &
7889 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7890 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7891 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7892 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
7893 default: return -EINVAL;
7894 }
7895
7896 if (new_line.loopback != 0 && new_line.loopback != 1)
7897 return -EINVAL;
7898
7899 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7900 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7901 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7902 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7903 info->params.flags |= flags;
7904
7905 info->params.loopback = new_line.loopback;
7906
7907 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
7908 info->params.clock_speed = new_line.clock_rate;
7909 else
7910 info->params.clock_speed = 0;
7911
7912 /* if network interface up, reprogram hardware */
7913 if (info->netcount)
7914 mgsl_program_hw(info);
7915 return 0;
7916
7917 default:
7918 return hdlc_ioctl(dev, ifr, cmd);
7919 }
7920}
7921
7922/**
7923 * called by network layer when transmit timeout is detected
7924 *
7925 * dev pointer to network device structure
7926 */
7927static void hdlcdev_tx_timeout(struct net_device *dev)
7928{
7929 struct mgsl_struct *info = dev_to_port(dev);
7930 unsigned long flags;
7931
7932 if (debug_level >= DEBUG_LEVEL_INFO)
7933 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
7934
7935 dev->stats.tx_errors++;
7936 dev->stats.tx_aborted_errors++;
7937
7938 spin_lock_irqsave(&info->irq_spinlock,flags);
7939 usc_stop_transmitter(info);
7940 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7941
7942 netif_wake_queue(dev);
7943}
7944
7945/**
7946 * called by device driver when transmit completes
7947 * reenable network layer transmit if stopped
7948 *
7949 * info pointer to device instance information
7950 */
7951static void hdlcdev_tx_done(struct mgsl_struct *info)
7952{
7953 if (netif_queue_stopped(info->netdev))
7954 netif_wake_queue(info->netdev);
7955}
7956
7957/**
7958 * called by device driver when frame received
7959 * pass frame to network layer
7960 *
7961 * info pointer to device instance information
7962 * buf pointer to buffer contianing frame data
7963 * size count of data bytes in buf
7964 */
7965static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
7966{
7967 struct sk_buff *skb = dev_alloc_skb(size);
7968 struct net_device *dev = info->netdev;
7969
7970 if (debug_level >= DEBUG_LEVEL_INFO)
7971 printk("hdlcdev_rx(%s)\n", dev->name);
7972
7973 if (skb == NULL) {
7974 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
7975 dev->name);
7976 dev->stats.rx_dropped++;
7977 return;
7978 }
7979
7980 memcpy(skb_put(skb, size), buf, size);
7981
7982 skb->protocol = hdlc_type_trans(skb, dev);
7983
7984 dev->stats.rx_packets++;
7985 dev->stats.rx_bytes += size;
7986
7987 netif_rx(skb);
7988}
7989
7990static const struct net_device_ops hdlcdev_ops = {
7991 .ndo_open = hdlcdev_open,
7992 .ndo_stop = hdlcdev_close,
7993 .ndo_change_mtu = hdlc_change_mtu,
7994 .ndo_start_xmit = hdlc_start_xmit,
7995 .ndo_do_ioctl = hdlcdev_ioctl,
7996 .ndo_tx_timeout = hdlcdev_tx_timeout,
7997};
7998
7999/**
8000 * called by device driver when adding device instance
8001 * do generic HDLC initialization
8002 *
8003 * info pointer to device instance information
8004 *
8005 * returns 0 if success, otherwise error code
8006 */
8007static int hdlcdev_init(struct mgsl_struct *info)
8008{
8009 int rc;
8010 struct net_device *dev;
8011 hdlc_device *hdlc;
8012
8013 /* allocate and initialize network and HDLC layer objects */
8014
8015 if (!(dev = alloc_hdlcdev(info))) {
8016 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
8017 return -ENOMEM;
8018 }
8019
8020 /* for network layer reporting purposes only */
8021 dev->base_addr = info->io_base;
8022 dev->irq = info->irq_level;
8023 dev->dma = info->dma_level;
8024
8025 /* network layer callbacks and settings */
8026 dev->netdev_ops = &hdlcdev_ops;
8027 dev->watchdog_timeo = 10 * HZ;
8028 dev->tx_queue_len = 50;
8029
8030 /* generic HDLC layer callbacks and settings */
8031 hdlc = dev_to_hdlc(dev);
8032 hdlc->attach = hdlcdev_attach;
8033 hdlc->xmit = hdlcdev_xmit;
8034
8035 /* register objects with HDLC layer */
8036 if ((rc = register_hdlc_device(dev))) {
8037 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
8038 free_netdev(dev);
8039 return rc;
8040 }
8041
8042 info->netdev = dev;
8043 return 0;
8044}
8045
8046/**
8047 * called by device driver when removing device instance
8048 * do generic HDLC cleanup
8049 *
8050 * info pointer to device instance information
8051 */
8052static void hdlcdev_exit(struct mgsl_struct *info)
8053{
8054 unregister_hdlc_device(info->netdev);
8055 free_netdev(info->netdev);
8056 info->netdev = NULL;
8057}
8058
8059#endif /* CONFIG_HDLC */
8060
8061
8062static int __devinit synclink_init_one (struct pci_dev *dev,
8063 const struct pci_device_id *ent)
8064{
8065 struct mgsl_struct *info;
8066
8067 if (pci_enable_device(dev)) {
8068 printk("error enabling pci device %p\n", dev);
8069 return -EIO;
8070 }
8071
8072 if (!(info = mgsl_allocate_device())) {
8073 printk("can't allocate device instance data.\n");
8074 return -EIO;
8075 }
8076
8077 /* Copy user configuration info to device instance data */
8078
8079 info->io_base = pci_resource_start(dev, 2);
8080 info->irq_level = dev->irq;
8081 info->phys_memory_base = pci_resource_start(dev, 3);
8082
8083 /* Because veremap only works on page boundaries we must map
8084 * a larger area than is actually implemented for the LCR
8085 * memory range. We map a full page starting at the page boundary.
8086 */
8087 info->phys_lcr_base = pci_resource_start(dev, 0);
8088 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
8089 info->phys_lcr_base &= ~(PAGE_SIZE-1);
8090
8091 info->bus_type = MGSL_BUS_TYPE_PCI;
8092 info->io_addr_size = 8;
8093 info->irq_flags = IRQF_SHARED;
8094
8095 if (dev->device == 0x0210) {
8096 /* Version 1 PCI9030 based universal PCI adapter */
8097 info->misc_ctrl_value = 0x007c4080;
8098 info->hw_version = 1;
8099 } else {
8100 /* Version 0 PCI9050 based 5V PCI adapter
8101 * A PCI9050 bug prevents reading LCR registers if
8102 * LCR base address bit 7 is set. Maintain shadow
8103 * value so we can write to LCR misc control reg.
8104 */
8105 info->misc_ctrl_value = 0x087e4546;
8106 info->hw_version = 0;
8107 }
8108
8109 mgsl_add_device(info);
8110
8111 return 0;
8112}
8113
8114static void __devexit synclink_remove_one (struct pci_dev *dev)
8115{
8116}
8117
1/*
2 * $Id: synclink.c,v 4.38 2005/11/07 16:30:34 paulkf Exp $
3 *
4 * Device driver for Microgate SyncLink ISA and PCI
5 * high speed multiprotocol serial adapters.
6 *
7 * written by Paul Fulghum for Microgate Corporation
8 * paulkf@microgate.com
9 *
10 * Microgate and SyncLink are trademarks of Microgate Corporation
11 *
12 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
13 *
14 * Original release 01/11/99
15 *
16 * This code is released under the GNU General Public License (GPL)
17 *
18 * This driver is primarily intended for use in synchronous
19 * HDLC mode. Asynchronous mode is also provided.
20 *
21 * When operating in synchronous mode, each call to mgsl_write()
22 * contains exactly one complete HDLC frame. Calling mgsl_put_char
23 * will start assembling an HDLC frame that will not be sent until
24 * mgsl_flush_chars or mgsl_write is called.
25 *
26 * Synchronous receive data is reported as complete frames. To accomplish
27 * this, the TTY flip buffer is bypassed (too small to hold largest
28 * frame and may fragment frames) and the line discipline
29 * receive entry point is called directly.
30 *
31 * This driver has been tested with a slightly modified ppp.c driver
32 * for synchronous PPP.
33 *
34 * 2000/02/16
35 * Added interface for syncppp.c driver (an alternate synchronous PPP
36 * implementation that also supports Cisco HDLC). Each device instance
37 * registers as a tty device AND a network device (if dosyncppp option
38 * is set for the device). The functionality is determined by which
39 * device interface is opened.
40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
45 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
46 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
47 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 */
53
54#if defined(__i386__)
55# define BREAKPOINT() asm(" int $3");
56#else
57# define BREAKPOINT() { }
58#endif
59
60#define MAX_ISA_DEVICES 10
61#define MAX_PCI_DEVICES 10
62#define MAX_TOTAL_DEVICES 20
63
64#include <linux/module.h>
65#include <linux/errno.h>
66#include <linux/signal.h>
67#include <linux/sched.h>
68#include <linux/timer.h>
69#include <linux/interrupt.h>
70#include <linux/pci.h>
71#include <linux/tty.h>
72#include <linux/tty_flip.h>
73#include <linux/serial.h>
74#include <linux/major.h>
75#include <linux/string.h>
76#include <linux/fcntl.h>
77#include <linux/ptrace.h>
78#include <linux/ioport.h>
79#include <linux/mm.h>
80#include <linux/seq_file.h>
81#include <linux/slab.h>
82#include <linux/delay.h>
83#include <linux/netdevice.h>
84#include <linux/vmalloc.h>
85#include <linux/init.h>
86#include <linux/ioctl.h>
87#include <linux/synclink.h>
88
89#include <asm/io.h>
90#include <asm/irq.h>
91#include <asm/dma.h>
92#include <linux/bitops.h>
93#include <asm/types.h>
94#include <linux/termios.h>
95#include <linux/workqueue.h>
96#include <linux/hdlc.h>
97#include <linux/dma-mapping.h>
98
99#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_MODULE))
100#define SYNCLINK_GENERIC_HDLC 1
101#else
102#define SYNCLINK_GENERIC_HDLC 0
103#endif
104
105#define GET_USER(error,value,addr) error = get_user(value,addr)
106#define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
107#define PUT_USER(error,value,addr) error = put_user(value,addr)
108#define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
109
110#include <asm/uaccess.h>
111
112#define RCLRVALUE 0xffff
113
114static MGSL_PARAMS default_params = {
115 MGSL_MODE_HDLC, /* unsigned long mode */
116 0, /* unsigned char loopback; */
117 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
118 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
119 0, /* unsigned long clock_speed; */
120 0xff, /* unsigned char addr_filter; */
121 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
122 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
123 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
124 9600, /* unsigned long data_rate; */
125 8, /* unsigned char data_bits; */
126 1, /* unsigned char stop_bits; */
127 ASYNC_PARITY_NONE /* unsigned char parity; */
128};
129
130#define SHARED_MEM_ADDRESS_SIZE 0x40000
131#define BUFFERLISTSIZE 4096
132#define DMABUFFERSIZE 4096
133#define MAXRXFRAMES 7
134
135typedef struct _DMABUFFERENTRY
136{
137 u32 phys_addr; /* 32-bit flat physical address of data buffer */
138 volatile u16 count; /* buffer size/data count */
139 volatile u16 status; /* Control/status field */
140 volatile u16 rcc; /* character count field */
141 u16 reserved; /* padding required by 16C32 */
142 u32 link; /* 32-bit flat link to next buffer entry */
143 char *virt_addr; /* virtual address of data buffer */
144 u32 phys_entry; /* physical address of this buffer entry */
145 dma_addr_t dma_addr;
146} DMABUFFERENTRY, *DMAPBUFFERENTRY;
147
148/* The queue of BH actions to be performed */
149
150#define BH_RECEIVE 1
151#define BH_TRANSMIT 2
152#define BH_STATUS 4
153
154#define IO_PIN_SHUTDOWN_LIMIT 100
155
156struct _input_signal_events {
157 int ri_up;
158 int ri_down;
159 int dsr_up;
160 int dsr_down;
161 int dcd_up;
162 int dcd_down;
163 int cts_up;
164 int cts_down;
165};
166
167/* transmit holding buffer definitions*/
168#define MAX_TX_HOLDING_BUFFERS 5
169struct tx_holding_buffer {
170 int buffer_size;
171 unsigned char * buffer;
172};
173
174
175/*
176 * Device instance data structure
177 */
178
179struct mgsl_struct {
180 int magic;
181 struct tty_port port;
182 int line;
183 int hw_version;
184
185 struct mgsl_icount icount;
186
187 int timeout;
188 int x_char; /* xon/xoff character */
189 u16 read_status_mask;
190 u16 ignore_status_mask;
191 unsigned char *xmit_buf;
192 int xmit_head;
193 int xmit_tail;
194 int xmit_cnt;
195
196 wait_queue_head_t status_event_wait_q;
197 wait_queue_head_t event_wait_q;
198 struct timer_list tx_timer; /* HDLC transmit timeout timer */
199 struct mgsl_struct *next_device; /* device list link */
200
201 spinlock_t irq_spinlock; /* spinlock for synchronizing with ISR */
202 struct work_struct task; /* task structure for scheduling bh */
203
204 u32 EventMask; /* event trigger mask */
205 u32 RecordedEvents; /* pending events */
206
207 u32 max_frame_size; /* as set by device config */
208
209 u32 pending_bh;
210
211 bool bh_running; /* Protection from multiple */
212 int isr_overflow;
213 bool bh_requested;
214
215 int dcd_chkcount; /* check counts to prevent */
216 int cts_chkcount; /* too many IRQs if a signal */
217 int dsr_chkcount; /* is floating */
218 int ri_chkcount;
219
220 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
221 u32 buffer_list_phys;
222 dma_addr_t buffer_list_dma_addr;
223
224 unsigned int rx_buffer_count; /* count of total allocated Rx buffers */
225 DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
226 unsigned int current_rx_buffer;
227
228 int num_tx_dma_buffers; /* number of tx dma frames required */
229 int tx_dma_buffers_used;
230 unsigned int tx_buffer_count; /* count of total allocated Tx buffers */
231 DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
232 int start_tx_dma_buffer; /* tx dma buffer to start tx dma operation */
233 int current_tx_buffer; /* next tx dma buffer to be loaded */
234
235 unsigned char *intermediate_rxbuffer;
236
237 int num_tx_holding_buffers; /* number of tx holding buffer allocated */
238 int get_tx_holding_index; /* next tx holding buffer for adapter to load */
239 int put_tx_holding_index; /* next tx holding buffer to store user request */
240 int tx_holding_count; /* number of tx holding buffers waiting */
241 struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
242
243 bool rx_enabled;
244 bool rx_overflow;
245 bool rx_rcc_underrun;
246
247 bool tx_enabled;
248 bool tx_active;
249 u32 idle_mode;
250
251 u16 cmr_value;
252 u16 tcsr_value;
253
254 char device_name[25]; /* device instance name */
255
256 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
257 unsigned char bus; /* expansion bus number (zero based) */
258 unsigned char function; /* PCI device number */
259
260 unsigned int io_base; /* base I/O address of adapter */
261 unsigned int io_addr_size; /* size of the I/O address range */
262 bool io_addr_requested; /* true if I/O address requested */
263
264 unsigned int irq_level; /* interrupt level */
265 unsigned long irq_flags;
266 bool irq_requested; /* true if IRQ requested */
267
268 unsigned int dma_level; /* DMA channel */
269 bool dma_requested; /* true if dma channel requested */
270
271 u16 mbre_bit;
272 u16 loopback_bits;
273 u16 usc_idle_mode;
274
275 MGSL_PARAMS params; /* communications parameters */
276
277 unsigned char serial_signals; /* current serial signal states */
278
279 bool irq_occurred; /* for diagnostics use */
280 unsigned int init_error; /* Initialization startup error (DIAGS) */
281 int fDiagnosticsmode; /* Driver in Diagnostic mode? (DIAGS) */
282
283 u32 last_mem_alloc;
284 unsigned char* memory_base; /* shared memory address (PCI only) */
285 u32 phys_memory_base;
286 bool shared_mem_requested;
287
288 unsigned char* lcr_base; /* local config registers (PCI only) */
289 u32 phys_lcr_base;
290 u32 lcr_offset;
291 bool lcr_mem_requested;
292
293 u32 misc_ctrl_value;
294 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
295 char char_buf[MAX_ASYNC_BUFFER_SIZE];
296 bool drop_rts_on_tx_done;
297
298 bool loopmode_insert_requested;
299 bool loopmode_send_done_requested;
300
301 struct _input_signal_events input_signal_events;
302
303 /* generic HDLC device parts */
304 int netcount;
305 spinlock_t netlock;
306
307#if SYNCLINK_GENERIC_HDLC
308 struct net_device *netdev;
309#endif
310};
311
312#define MGSL_MAGIC 0x5401
313
314/*
315 * The size of the serial xmit buffer is 1 page, or 4096 bytes
316 */
317#ifndef SERIAL_XMIT_SIZE
318#define SERIAL_XMIT_SIZE 4096
319#endif
320
321/*
322 * These macros define the offsets used in calculating the
323 * I/O address of the specified USC registers.
324 */
325
326
327#define DCPIN 2 /* Bit 1 of I/O address */
328#define SDPIN 4 /* Bit 2 of I/O address */
329
330#define DCAR 0 /* DMA command/address register */
331#define CCAR SDPIN /* channel command/address register */
332#define DATAREG DCPIN + SDPIN /* serial data register */
333#define MSBONLY 0x41
334#define LSBONLY 0x40
335
336/*
337 * These macros define the register address (ordinal number)
338 * used for writing address/value pairs to the USC.
339 */
340
341#define CMR 0x02 /* Channel mode Register */
342#define CCSR 0x04 /* Channel Command/status Register */
343#define CCR 0x06 /* Channel Control Register */
344#define PSR 0x08 /* Port status Register */
345#define PCR 0x0a /* Port Control Register */
346#define TMDR 0x0c /* Test mode Data Register */
347#define TMCR 0x0e /* Test mode Control Register */
348#define CMCR 0x10 /* Clock mode Control Register */
349#define HCR 0x12 /* Hardware Configuration Register */
350#define IVR 0x14 /* Interrupt Vector Register */
351#define IOCR 0x16 /* Input/Output Control Register */
352#define ICR 0x18 /* Interrupt Control Register */
353#define DCCR 0x1a /* Daisy Chain Control Register */
354#define MISR 0x1c /* Misc Interrupt status Register */
355#define SICR 0x1e /* status Interrupt Control Register */
356#define RDR 0x20 /* Receive Data Register */
357#define RMR 0x22 /* Receive mode Register */
358#define RCSR 0x24 /* Receive Command/status Register */
359#define RICR 0x26 /* Receive Interrupt Control Register */
360#define RSR 0x28 /* Receive Sync Register */
361#define RCLR 0x2a /* Receive count Limit Register */
362#define RCCR 0x2c /* Receive Character count Register */
363#define TC0R 0x2e /* Time Constant 0 Register */
364#define TDR 0x30 /* Transmit Data Register */
365#define TMR 0x32 /* Transmit mode Register */
366#define TCSR 0x34 /* Transmit Command/status Register */
367#define TICR 0x36 /* Transmit Interrupt Control Register */
368#define TSR 0x38 /* Transmit Sync Register */
369#define TCLR 0x3a /* Transmit count Limit Register */
370#define TCCR 0x3c /* Transmit Character count Register */
371#define TC1R 0x3e /* Time Constant 1 Register */
372
373
374/*
375 * MACRO DEFINITIONS FOR DMA REGISTERS
376 */
377
378#define DCR 0x06 /* DMA Control Register (shared) */
379#define DACR 0x08 /* DMA Array count Register (shared) */
380#define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
381#define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
382#define DICR 0x18 /* DMA Interrupt Control Register (shared) */
383#define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
384#define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
385
386#define TDMR 0x02 /* Transmit DMA mode Register */
387#define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
388#define TBCR 0x2a /* Transmit Byte count Register */
389#define TARL 0x2c /* Transmit Address Register (low) */
390#define TARU 0x2e /* Transmit Address Register (high) */
391#define NTBCR 0x3a /* Next Transmit Byte count Register */
392#define NTARL 0x3c /* Next Transmit Address Register (low) */
393#define NTARU 0x3e /* Next Transmit Address Register (high) */
394
395#define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
396#define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
397#define RBCR 0xaa /* Receive Byte count Register */
398#define RARL 0xac /* Receive Address Register (low) */
399#define RARU 0xae /* Receive Address Register (high) */
400#define NRBCR 0xba /* Next Receive Byte count Register */
401#define NRARL 0xbc /* Next Receive Address Register (low) */
402#define NRARU 0xbe /* Next Receive Address Register (high) */
403
404
405/*
406 * MACRO DEFINITIONS FOR MODEM STATUS BITS
407 */
408
409#define MODEMSTATUS_DTR 0x80
410#define MODEMSTATUS_DSR 0x40
411#define MODEMSTATUS_RTS 0x20
412#define MODEMSTATUS_CTS 0x10
413#define MODEMSTATUS_RI 0x04
414#define MODEMSTATUS_DCD 0x01
415
416
417/*
418 * Channel Command/Address Register (CCAR) Command Codes
419 */
420
421#define RTCmd_Null 0x0000
422#define RTCmd_ResetHighestIus 0x1000
423#define RTCmd_TriggerChannelLoadDma 0x2000
424#define RTCmd_TriggerRxDma 0x2800
425#define RTCmd_TriggerTxDma 0x3000
426#define RTCmd_TriggerRxAndTxDma 0x3800
427#define RTCmd_PurgeRxFifo 0x4800
428#define RTCmd_PurgeTxFifo 0x5000
429#define RTCmd_PurgeRxAndTxFifo 0x5800
430#define RTCmd_LoadRcc 0x6800
431#define RTCmd_LoadTcc 0x7000
432#define RTCmd_LoadRccAndTcc 0x7800
433#define RTCmd_LoadTC0 0x8800
434#define RTCmd_LoadTC1 0x9000
435#define RTCmd_LoadTC0AndTC1 0x9800
436#define RTCmd_SerialDataLSBFirst 0xa000
437#define RTCmd_SerialDataMSBFirst 0xa800
438#define RTCmd_SelectBigEndian 0xb000
439#define RTCmd_SelectLittleEndian 0xb800
440
441
442/*
443 * DMA Command/Address Register (DCAR) Command Codes
444 */
445
446#define DmaCmd_Null 0x0000
447#define DmaCmd_ResetTxChannel 0x1000
448#define DmaCmd_ResetRxChannel 0x1200
449#define DmaCmd_StartTxChannel 0x2000
450#define DmaCmd_StartRxChannel 0x2200
451#define DmaCmd_ContinueTxChannel 0x3000
452#define DmaCmd_ContinueRxChannel 0x3200
453#define DmaCmd_PauseTxChannel 0x4000
454#define DmaCmd_PauseRxChannel 0x4200
455#define DmaCmd_AbortTxChannel 0x5000
456#define DmaCmd_AbortRxChannel 0x5200
457#define DmaCmd_InitTxChannel 0x7000
458#define DmaCmd_InitRxChannel 0x7200
459#define DmaCmd_ResetHighestDmaIus 0x8000
460#define DmaCmd_ResetAllChannels 0x9000
461#define DmaCmd_StartAllChannels 0xa000
462#define DmaCmd_ContinueAllChannels 0xb000
463#define DmaCmd_PauseAllChannels 0xc000
464#define DmaCmd_AbortAllChannels 0xd000
465#define DmaCmd_InitAllChannels 0xf000
466
467#define TCmd_Null 0x0000
468#define TCmd_ClearTxCRC 0x2000
469#define TCmd_SelectTicrTtsaData 0x4000
470#define TCmd_SelectTicrTxFifostatus 0x5000
471#define TCmd_SelectTicrIntLevel 0x6000
472#define TCmd_SelectTicrdma_level 0x7000
473#define TCmd_SendFrame 0x8000
474#define TCmd_SendAbort 0x9000
475#define TCmd_EnableDleInsertion 0xc000
476#define TCmd_DisableDleInsertion 0xd000
477#define TCmd_ClearEofEom 0xe000
478#define TCmd_SetEofEom 0xf000
479
480#define RCmd_Null 0x0000
481#define RCmd_ClearRxCRC 0x2000
482#define RCmd_EnterHuntmode 0x3000
483#define RCmd_SelectRicrRtsaData 0x4000
484#define RCmd_SelectRicrRxFifostatus 0x5000
485#define RCmd_SelectRicrIntLevel 0x6000
486#define RCmd_SelectRicrdma_level 0x7000
487
488/*
489 * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
490 */
491
492#define RECEIVE_STATUS BIT5
493#define RECEIVE_DATA BIT4
494#define TRANSMIT_STATUS BIT3
495#define TRANSMIT_DATA BIT2
496#define IO_PIN BIT1
497#define MISC BIT0
498
499
500/*
501 * Receive status Bits in Receive Command/status Register RCSR
502 */
503
504#define RXSTATUS_SHORT_FRAME BIT8
505#define RXSTATUS_CODE_VIOLATION BIT8
506#define RXSTATUS_EXITED_HUNT BIT7
507#define RXSTATUS_IDLE_RECEIVED BIT6
508#define RXSTATUS_BREAK_RECEIVED BIT5
509#define RXSTATUS_ABORT_RECEIVED BIT5
510#define RXSTATUS_RXBOUND BIT4
511#define RXSTATUS_CRC_ERROR BIT3
512#define RXSTATUS_FRAMING_ERROR BIT3
513#define RXSTATUS_ABORT BIT2
514#define RXSTATUS_PARITY_ERROR BIT2
515#define RXSTATUS_OVERRUN BIT1
516#define RXSTATUS_DATA_AVAILABLE BIT0
517#define RXSTATUS_ALL 0x01f6
518#define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
519
520/*
521 * Values for setting transmit idle mode in
522 * Transmit Control/status Register (TCSR)
523 */
524#define IDLEMODE_FLAGS 0x0000
525#define IDLEMODE_ALT_ONE_ZERO 0x0100
526#define IDLEMODE_ZERO 0x0200
527#define IDLEMODE_ONE 0x0300
528#define IDLEMODE_ALT_MARK_SPACE 0x0500
529#define IDLEMODE_SPACE 0x0600
530#define IDLEMODE_MARK 0x0700
531#define IDLEMODE_MASK 0x0700
532
533/*
534 * IUSC revision identifiers
535 */
536#define IUSC_SL1660 0x4d44
537#define IUSC_PRE_SL1660 0x4553
538
539/*
540 * Transmit status Bits in Transmit Command/status Register (TCSR)
541 */
542
543#define TCSR_PRESERVE 0x0F00
544
545#define TCSR_UNDERWAIT BIT11
546#define TXSTATUS_PREAMBLE_SENT BIT7
547#define TXSTATUS_IDLE_SENT BIT6
548#define TXSTATUS_ABORT_SENT BIT5
549#define TXSTATUS_EOF_SENT BIT4
550#define TXSTATUS_EOM_SENT BIT4
551#define TXSTATUS_CRC_SENT BIT3
552#define TXSTATUS_ALL_SENT BIT2
553#define TXSTATUS_UNDERRUN BIT1
554#define TXSTATUS_FIFO_EMPTY BIT0
555#define TXSTATUS_ALL 0x00fa
556#define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
557
558
559#define MISCSTATUS_RXC_LATCHED BIT15
560#define MISCSTATUS_RXC BIT14
561#define MISCSTATUS_TXC_LATCHED BIT13
562#define MISCSTATUS_TXC BIT12
563#define MISCSTATUS_RI_LATCHED BIT11
564#define MISCSTATUS_RI BIT10
565#define MISCSTATUS_DSR_LATCHED BIT9
566#define MISCSTATUS_DSR BIT8
567#define MISCSTATUS_DCD_LATCHED BIT7
568#define MISCSTATUS_DCD BIT6
569#define MISCSTATUS_CTS_LATCHED BIT5
570#define MISCSTATUS_CTS BIT4
571#define MISCSTATUS_RCC_UNDERRUN BIT3
572#define MISCSTATUS_DPLL_NO_SYNC BIT2
573#define MISCSTATUS_BRG1_ZERO BIT1
574#define MISCSTATUS_BRG0_ZERO BIT0
575
576#define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
577#define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
578
579#define SICR_RXC_ACTIVE BIT15
580#define SICR_RXC_INACTIVE BIT14
581#define SICR_RXC (BIT15+BIT14)
582#define SICR_TXC_ACTIVE BIT13
583#define SICR_TXC_INACTIVE BIT12
584#define SICR_TXC (BIT13+BIT12)
585#define SICR_RI_ACTIVE BIT11
586#define SICR_RI_INACTIVE BIT10
587#define SICR_RI (BIT11+BIT10)
588#define SICR_DSR_ACTIVE BIT9
589#define SICR_DSR_INACTIVE BIT8
590#define SICR_DSR (BIT9+BIT8)
591#define SICR_DCD_ACTIVE BIT7
592#define SICR_DCD_INACTIVE BIT6
593#define SICR_DCD (BIT7+BIT6)
594#define SICR_CTS_ACTIVE BIT5
595#define SICR_CTS_INACTIVE BIT4
596#define SICR_CTS (BIT5+BIT4)
597#define SICR_RCC_UNDERFLOW BIT3
598#define SICR_DPLL_NO_SYNC BIT2
599#define SICR_BRG1_ZERO BIT1
600#define SICR_BRG0_ZERO BIT0
601
602void usc_DisableMasterIrqBit( struct mgsl_struct *info );
603void usc_EnableMasterIrqBit( struct mgsl_struct *info );
604void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
605void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
606void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
607
608#define usc_EnableInterrupts( a, b ) \
609 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
610
611#define usc_DisableInterrupts( a, b ) \
612 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
613
614#define usc_EnableMasterIrqBit(a) \
615 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
616
617#define usc_DisableMasterIrqBit(a) \
618 usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
619
620#define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
621
622/*
623 * Transmit status Bits in Transmit Control status Register (TCSR)
624 * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
625 */
626
627#define TXSTATUS_PREAMBLE_SENT BIT7
628#define TXSTATUS_IDLE_SENT BIT6
629#define TXSTATUS_ABORT_SENT BIT5
630#define TXSTATUS_EOF BIT4
631#define TXSTATUS_CRC_SENT BIT3
632#define TXSTATUS_ALL_SENT BIT2
633#define TXSTATUS_UNDERRUN BIT1
634#define TXSTATUS_FIFO_EMPTY BIT0
635
636#define DICR_MASTER BIT15
637#define DICR_TRANSMIT BIT0
638#define DICR_RECEIVE BIT1
639
640#define usc_EnableDmaInterrupts(a,b) \
641 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
642
643#define usc_DisableDmaInterrupts(a,b) \
644 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
645
646#define usc_EnableStatusIrqs(a,b) \
647 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
648
649#define usc_DisablestatusIrqs(a,b) \
650 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
651
652/* Transmit status Bits in Transmit Control status Register (TCSR) */
653/* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
654
655
656#define DISABLE_UNCONDITIONAL 0
657#define DISABLE_END_OF_FRAME 1
658#define ENABLE_UNCONDITIONAL 2
659#define ENABLE_AUTO_CTS 3
660#define ENABLE_AUTO_DCD 3
661#define usc_EnableTransmitter(a,b) \
662 usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
663#define usc_EnableReceiver(a,b) \
664 usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
665
666static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
667static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
668static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
669
670static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
671static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
672static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
673void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
674void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
675
676#define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
677#define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
678
679#define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
680
681static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
682static void usc_start_receiver( struct mgsl_struct *info );
683static void usc_stop_receiver( struct mgsl_struct *info );
684
685static void usc_start_transmitter( struct mgsl_struct *info );
686static void usc_stop_transmitter( struct mgsl_struct *info );
687static void usc_set_txidle( struct mgsl_struct *info );
688static void usc_load_txfifo( struct mgsl_struct *info );
689
690static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
691static void usc_enable_loopback( struct mgsl_struct *info, int enable );
692
693static void usc_get_serial_signals( struct mgsl_struct *info );
694static void usc_set_serial_signals( struct mgsl_struct *info );
695
696static void usc_reset( struct mgsl_struct *info );
697
698static void usc_set_sync_mode( struct mgsl_struct *info );
699static void usc_set_sdlc_mode( struct mgsl_struct *info );
700static void usc_set_async_mode( struct mgsl_struct *info );
701static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
702
703static void usc_loopback_frame( struct mgsl_struct *info );
704
705static void mgsl_tx_timeout(unsigned long context);
706
707
708static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
709static void usc_loopmode_insert_request( struct mgsl_struct * info );
710static int usc_loopmode_active( struct mgsl_struct * info);
711static void usc_loopmode_send_done( struct mgsl_struct * info );
712
713static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
714
715#if SYNCLINK_GENERIC_HDLC
716#define dev_to_port(D) (dev_to_hdlc(D)->priv)
717static void hdlcdev_tx_done(struct mgsl_struct *info);
718static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
719static int hdlcdev_init(struct mgsl_struct *info);
720static void hdlcdev_exit(struct mgsl_struct *info);
721#endif
722
723/*
724 * Defines a BUS descriptor value for the PCI adapter
725 * local bus address ranges.
726 */
727
728#define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
729(0x00400020 + \
730((WrHold) << 30) + \
731((WrDly) << 28) + \
732((RdDly) << 26) + \
733((Nwdd) << 20) + \
734((Nwad) << 15) + \
735((Nxda) << 13) + \
736((Nrdd) << 11) + \
737((Nrad) << 6) )
738
739static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
740
741/*
742 * Adapter diagnostic routines
743 */
744static bool mgsl_register_test( struct mgsl_struct *info );
745static bool mgsl_irq_test( struct mgsl_struct *info );
746static bool mgsl_dma_test( struct mgsl_struct *info );
747static bool mgsl_memory_test( struct mgsl_struct *info );
748static int mgsl_adapter_test( struct mgsl_struct *info );
749
750/*
751 * device and resource management routines
752 */
753static int mgsl_claim_resources(struct mgsl_struct *info);
754static void mgsl_release_resources(struct mgsl_struct *info);
755static void mgsl_add_device(struct mgsl_struct *info);
756static struct mgsl_struct* mgsl_allocate_device(void);
757
758/*
759 * DMA buffer manupulation functions.
760 */
761static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
762static bool mgsl_get_rx_frame( struct mgsl_struct *info );
763static bool mgsl_get_raw_rx_frame( struct mgsl_struct *info );
764static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
765static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
766static int num_free_tx_dma_buffers(struct mgsl_struct *info);
767static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
768static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
769
770/*
771 * DMA and Shared Memory buffer allocation and formatting
772 */
773static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
774static void mgsl_free_dma_buffers(struct mgsl_struct *info);
775static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
776static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
777static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
778static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
779static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
780static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
781static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
782static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
783static bool load_next_tx_holding_buffer(struct mgsl_struct *info);
784static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
785
786/*
787 * Bottom half interrupt handlers
788 */
789static void mgsl_bh_handler(struct work_struct *work);
790static void mgsl_bh_receive(struct mgsl_struct *info);
791static void mgsl_bh_transmit(struct mgsl_struct *info);
792static void mgsl_bh_status(struct mgsl_struct *info);
793
794/*
795 * Interrupt handler routines and dispatch table.
796 */
797static void mgsl_isr_null( struct mgsl_struct *info );
798static void mgsl_isr_transmit_data( struct mgsl_struct *info );
799static void mgsl_isr_receive_data( struct mgsl_struct *info );
800static void mgsl_isr_receive_status( struct mgsl_struct *info );
801static void mgsl_isr_transmit_status( struct mgsl_struct *info );
802static void mgsl_isr_io_pin( struct mgsl_struct *info );
803static void mgsl_isr_misc( struct mgsl_struct *info );
804static void mgsl_isr_receive_dma( struct mgsl_struct *info );
805static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
806
807typedef void (*isr_dispatch_func)(struct mgsl_struct *);
808
809static isr_dispatch_func UscIsrTable[7] =
810{
811 mgsl_isr_null,
812 mgsl_isr_misc,
813 mgsl_isr_io_pin,
814 mgsl_isr_transmit_data,
815 mgsl_isr_transmit_status,
816 mgsl_isr_receive_data,
817 mgsl_isr_receive_status
818};
819
820/*
821 * ioctl call handlers
822 */
823static int tiocmget(struct tty_struct *tty);
824static int tiocmset(struct tty_struct *tty,
825 unsigned int set, unsigned int clear);
826static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
827 __user *user_icount);
828static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
829static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
830static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
831static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
832static int mgsl_txenable(struct mgsl_struct * info, int enable);
833static int mgsl_txabort(struct mgsl_struct * info);
834static int mgsl_rxenable(struct mgsl_struct * info, int enable);
835static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
836static int mgsl_loopmode_send_done( struct mgsl_struct * info );
837
838/* set non-zero on successful registration with PCI subsystem */
839static bool pci_registered;
840
841/*
842 * Global linked list of SyncLink devices
843 */
844static struct mgsl_struct *mgsl_device_list;
845static int mgsl_device_count;
846
847/*
848 * Set this param to non-zero to load eax with the
849 * .text section address and breakpoint on module load.
850 * This is useful for use with gdb and add-symbol-file command.
851 */
852static bool break_on_load;
853
854/*
855 * Driver major number, defaults to zero to get auto
856 * assigned major number. May be forced as module parameter.
857 */
858static int ttymajor;
859
860/*
861 * Array of user specified options for ISA adapters.
862 */
863static int io[MAX_ISA_DEVICES];
864static int irq[MAX_ISA_DEVICES];
865static int dma[MAX_ISA_DEVICES];
866static int debug_level;
867static int maxframe[MAX_TOTAL_DEVICES];
868static int txdmabufs[MAX_TOTAL_DEVICES];
869static int txholdbufs[MAX_TOTAL_DEVICES];
870
871module_param(break_on_load, bool, 0);
872module_param(ttymajor, int, 0);
873module_param_array(io, int, NULL, 0);
874module_param_array(irq, int, NULL, 0);
875module_param_array(dma, int, NULL, 0);
876module_param(debug_level, int, 0);
877module_param_array(maxframe, int, NULL, 0);
878module_param_array(txdmabufs, int, NULL, 0);
879module_param_array(txholdbufs, int, NULL, 0);
880
881static char *driver_name = "SyncLink serial driver";
882static char *driver_version = "$Revision: 4.38 $";
883
884static int synclink_init_one (struct pci_dev *dev,
885 const struct pci_device_id *ent);
886static void synclink_remove_one (struct pci_dev *dev);
887
888static struct pci_device_id synclink_pci_tbl[] = {
889 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
890 { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
891 { 0, }, /* terminate list */
892};
893MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
894
895MODULE_LICENSE("GPL");
896
897static struct pci_driver synclink_pci_driver = {
898 .name = "synclink",
899 .id_table = synclink_pci_tbl,
900 .probe = synclink_init_one,
901 .remove = __devexit_p(synclink_remove_one),
902};
903
904static struct tty_driver *serial_driver;
905
906/* number of characters left in xmit buffer before we ask for more */
907#define WAKEUP_CHARS 256
908
909
910static void mgsl_change_params(struct mgsl_struct *info);
911static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
912
913/*
914 * 1st function defined in .text section. Calling this function in
915 * init_module() followed by a breakpoint allows a remote debugger
916 * (gdb) to get the .text address for the add-symbol-file command.
917 * This allows remote debugging of dynamically loadable modules.
918 */
919static void* mgsl_get_text_ptr(void)
920{
921 return mgsl_get_text_ptr;
922}
923
924static inline int mgsl_paranoia_check(struct mgsl_struct *info,
925 char *name, const char *routine)
926{
927#ifdef MGSL_PARANOIA_CHECK
928 static const char *badmagic =
929 "Warning: bad magic number for mgsl struct (%s) in %s\n";
930 static const char *badinfo =
931 "Warning: null mgsl_struct for (%s) in %s\n";
932
933 if (!info) {
934 printk(badinfo, name, routine);
935 return 1;
936 }
937 if (info->magic != MGSL_MAGIC) {
938 printk(badmagic, name, routine);
939 return 1;
940 }
941#else
942 if (!info)
943 return 1;
944#endif
945 return 0;
946}
947
948/**
949 * line discipline callback wrappers
950 *
951 * The wrappers maintain line discipline references
952 * while calling into the line discipline.
953 *
954 * ldisc_receive_buf - pass receive data to line discipline
955 */
956
957static void ldisc_receive_buf(struct tty_struct *tty,
958 const __u8 *data, char *flags, int count)
959{
960 struct tty_ldisc *ld;
961 if (!tty)
962 return;
963 ld = tty_ldisc_ref(tty);
964 if (ld) {
965 if (ld->ops->receive_buf)
966 ld->ops->receive_buf(tty, data, flags, count);
967 tty_ldisc_deref(ld);
968 }
969}
970
971/* mgsl_stop() throttle (stop) transmitter
972 *
973 * Arguments: tty pointer to tty info structure
974 * Return Value: None
975 */
976static void mgsl_stop(struct tty_struct *tty)
977{
978 struct mgsl_struct *info = tty->driver_data;
979 unsigned long flags;
980
981 if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
982 return;
983
984 if ( debug_level >= DEBUG_LEVEL_INFO )
985 printk("mgsl_stop(%s)\n",info->device_name);
986
987 spin_lock_irqsave(&info->irq_spinlock,flags);
988 if (info->tx_enabled)
989 usc_stop_transmitter(info);
990 spin_unlock_irqrestore(&info->irq_spinlock,flags);
991
992} /* end of mgsl_stop() */
993
994/* mgsl_start() release (start) transmitter
995 *
996 * Arguments: tty pointer to tty info structure
997 * Return Value: None
998 */
999static void mgsl_start(struct tty_struct *tty)
1000{
1001 struct mgsl_struct *info = tty->driver_data;
1002 unsigned long flags;
1003
1004 if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1005 return;
1006
1007 if ( debug_level >= DEBUG_LEVEL_INFO )
1008 printk("mgsl_start(%s)\n",info->device_name);
1009
1010 spin_lock_irqsave(&info->irq_spinlock,flags);
1011 if (!info->tx_enabled)
1012 usc_start_transmitter(info);
1013 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1014
1015} /* end of mgsl_start() */
1016
1017/*
1018 * Bottom half work queue access functions
1019 */
1020
1021/* mgsl_bh_action() Return next bottom half action to perform.
1022 * Return Value: BH action code or 0 if nothing to do.
1023 */
1024static int mgsl_bh_action(struct mgsl_struct *info)
1025{
1026 unsigned long flags;
1027 int rc = 0;
1028
1029 spin_lock_irqsave(&info->irq_spinlock,flags);
1030
1031 if (info->pending_bh & BH_RECEIVE) {
1032 info->pending_bh &= ~BH_RECEIVE;
1033 rc = BH_RECEIVE;
1034 } else if (info->pending_bh & BH_TRANSMIT) {
1035 info->pending_bh &= ~BH_TRANSMIT;
1036 rc = BH_TRANSMIT;
1037 } else if (info->pending_bh & BH_STATUS) {
1038 info->pending_bh &= ~BH_STATUS;
1039 rc = BH_STATUS;
1040 }
1041
1042 if (!rc) {
1043 /* Mark BH routine as complete */
1044 info->bh_running = false;
1045 info->bh_requested = false;
1046 }
1047
1048 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1049
1050 return rc;
1051}
1052
1053/*
1054 * Perform bottom half processing of work items queued by ISR.
1055 */
1056static void mgsl_bh_handler(struct work_struct *work)
1057{
1058 struct mgsl_struct *info =
1059 container_of(work, struct mgsl_struct, task);
1060 int action;
1061
1062 if (!info)
1063 return;
1064
1065 if ( debug_level >= DEBUG_LEVEL_BH )
1066 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1067 __FILE__,__LINE__,info->device_name);
1068
1069 info->bh_running = true;
1070
1071 while((action = mgsl_bh_action(info)) != 0) {
1072
1073 /* Process work item */
1074 if ( debug_level >= DEBUG_LEVEL_BH )
1075 printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1076 __FILE__,__LINE__,action);
1077
1078 switch (action) {
1079
1080 case BH_RECEIVE:
1081 mgsl_bh_receive(info);
1082 break;
1083 case BH_TRANSMIT:
1084 mgsl_bh_transmit(info);
1085 break;
1086 case BH_STATUS:
1087 mgsl_bh_status(info);
1088 break;
1089 default:
1090 /* unknown work item ID */
1091 printk("Unknown work item ID=%08X!\n", action);
1092 break;
1093 }
1094 }
1095
1096 if ( debug_level >= DEBUG_LEVEL_BH )
1097 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1098 __FILE__,__LINE__,info->device_name);
1099}
1100
1101static void mgsl_bh_receive(struct mgsl_struct *info)
1102{
1103 bool (*get_rx_frame)(struct mgsl_struct *info) =
1104 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1105
1106 if ( debug_level >= DEBUG_LEVEL_BH )
1107 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1108 __FILE__,__LINE__,info->device_name);
1109
1110 do
1111 {
1112 if (info->rx_rcc_underrun) {
1113 unsigned long flags;
1114 spin_lock_irqsave(&info->irq_spinlock,flags);
1115 usc_start_receiver(info);
1116 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1117 return;
1118 }
1119 } while(get_rx_frame(info));
1120}
1121
1122static void mgsl_bh_transmit(struct mgsl_struct *info)
1123{
1124 struct tty_struct *tty = info->port.tty;
1125 unsigned long flags;
1126
1127 if ( debug_level >= DEBUG_LEVEL_BH )
1128 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1129 __FILE__,__LINE__,info->device_name);
1130
1131 if (tty)
1132 tty_wakeup(tty);
1133
1134 /* if transmitter idle and loopmode_send_done_requested
1135 * then start echoing RxD to TxD
1136 */
1137 spin_lock_irqsave(&info->irq_spinlock,flags);
1138 if ( !info->tx_active && info->loopmode_send_done_requested )
1139 usc_loopmode_send_done( info );
1140 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1141}
1142
1143static void mgsl_bh_status(struct mgsl_struct *info)
1144{
1145 if ( debug_level >= DEBUG_LEVEL_BH )
1146 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1147 __FILE__,__LINE__,info->device_name);
1148
1149 info->ri_chkcount = 0;
1150 info->dsr_chkcount = 0;
1151 info->dcd_chkcount = 0;
1152 info->cts_chkcount = 0;
1153}
1154
1155/* mgsl_isr_receive_status()
1156 *
1157 * Service a receive status interrupt. The type of status
1158 * interrupt is indicated by the state of the RCSR.
1159 * This is only used for HDLC mode.
1160 *
1161 * Arguments: info pointer to device instance data
1162 * Return Value: None
1163 */
1164static void mgsl_isr_receive_status( struct mgsl_struct *info )
1165{
1166 u16 status = usc_InReg( info, RCSR );
1167
1168 if ( debug_level >= DEBUG_LEVEL_ISR )
1169 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1170 __FILE__,__LINE__,status);
1171
1172 if ( (status & RXSTATUS_ABORT_RECEIVED) &&
1173 info->loopmode_insert_requested &&
1174 usc_loopmode_active(info) )
1175 {
1176 ++info->icount.rxabort;
1177 info->loopmode_insert_requested = false;
1178
1179 /* clear CMR:13 to start echoing RxD to TxD */
1180 info->cmr_value &= ~BIT13;
1181 usc_OutReg(info, CMR, info->cmr_value);
1182
1183 /* disable received abort irq (no longer required) */
1184 usc_OutReg(info, RICR,
1185 (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1186 }
1187
1188 if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
1189 if (status & RXSTATUS_EXITED_HUNT)
1190 info->icount.exithunt++;
1191 if (status & RXSTATUS_IDLE_RECEIVED)
1192 info->icount.rxidle++;
1193 wake_up_interruptible(&info->event_wait_q);
1194 }
1195
1196 if (status & RXSTATUS_OVERRUN){
1197 info->icount.rxover++;
1198 usc_process_rxoverrun_sync( info );
1199 }
1200
1201 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1202 usc_UnlatchRxstatusBits( info, status );
1203
1204} /* end of mgsl_isr_receive_status() */
1205
1206/* mgsl_isr_transmit_status()
1207 *
1208 * Service a transmit status interrupt
1209 * HDLC mode :end of transmit frame
1210 * Async mode:all data is sent
1211 * transmit status is indicated by bits in the TCSR.
1212 *
1213 * Arguments: info pointer to device instance data
1214 * Return Value: None
1215 */
1216static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1217{
1218 u16 status = usc_InReg( info, TCSR );
1219
1220 if ( debug_level >= DEBUG_LEVEL_ISR )
1221 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1222 __FILE__,__LINE__,status);
1223
1224 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1225 usc_UnlatchTxstatusBits( info, status );
1226
1227 if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1228 {
1229 /* finished sending HDLC abort. This may leave */
1230 /* the TxFifo with data from the aborted frame */
1231 /* so purge the TxFifo. Also shutdown the DMA */
1232 /* channel in case there is data remaining in */
1233 /* the DMA buffer */
1234 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1235 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1236 }
1237
1238 if ( status & TXSTATUS_EOF_SENT )
1239 info->icount.txok++;
1240 else if ( status & TXSTATUS_UNDERRUN )
1241 info->icount.txunder++;
1242 else if ( status & TXSTATUS_ABORT_SENT )
1243 info->icount.txabort++;
1244 else
1245 info->icount.txunder++;
1246
1247 info->tx_active = false;
1248 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1249 del_timer(&info->tx_timer);
1250
1251 if ( info->drop_rts_on_tx_done ) {
1252 usc_get_serial_signals( info );
1253 if ( info->serial_signals & SerialSignal_RTS ) {
1254 info->serial_signals &= ~SerialSignal_RTS;
1255 usc_set_serial_signals( info );
1256 }
1257 info->drop_rts_on_tx_done = false;
1258 }
1259
1260#if SYNCLINK_GENERIC_HDLC
1261 if (info->netcount)
1262 hdlcdev_tx_done(info);
1263 else
1264#endif
1265 {
1266 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1267 usc_stop_transmitter(info);
1268 return;
1269 }
1270 info->pending_bh |= BH_TRANSMIT;
1271 }
1272
1273} /* end of mgsl_isr_transmit_status() */
1274
1275/* mgsl_isr_io_pin()
1276 *
1277 * Service an Input/Output pin interrupt. The type of
1278 * interrupt is indicated by bits in the MISR
1279 *
1280 * Arguments: info pointer to device instance data
1281 * Return Value: None
1282 */
1283static void mgsl_isr_io_pin( struct mgsl_struct *info )
1284{
1285 struct mgsl_icount *icount;
1286 u16 status = usc_InReg( info, MISR );
1287
1288 if ( debug_level >= DEBUG_LEVEL_ISR )
1289 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1290 __FILE__,__LINE__,status);
1291
1292 usc_ClearIrqPendingBits( info, IO_PIN );
1293 usc_UnlatchIostatusBits( info, status );
1294
1295 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1296 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1297 icount = &info->icount;
1298 /* update input line counters */
1299 if (status & MISCSTATUS_RI_LATCHED) {
1300 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1301 usc_DisablestatusIrqs(info,SICR_RI);
1302 icount->rng++;
1303 if ( status & MISCSTATUS_RI )
1304 info->input_signal_events.ri_up++;
1305 else
1306 info->input_signal_events.ri_down++;
1307 }
1308 if (status & MISCSTATUS_DSR_LATCHED) {
1309 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1310 usc_DisablestatusIrqs(info,SICR_DSR);
1311 icount->dsr++;
1312 if ( status & MISCSTATUS_DSR )
1313 info->input_signal_events.dsr_up++;
1314 else
1315 info->input_signal_events.dsr_down++;
1316 }
1317 if (status & MISCSTATUS_DCD_LATCHED) {
1318 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1319 usc_DisablestatusIrqs(info,SICR_DCD);
1320 icount->dcd++;
1321 if (status & MISCSTATUS_DCD) {
1322 info->input_signal_events.dcd_up++;
1323 } else
1324 info->input_signal_events.dcd_down++;
1325#if SYNCLINK_GENERIC_HDLC
1326 if (info->netcount) {
1327 if (status & MISCSTATUS_DCD)
1328 netif_carrier_on(info->netdev);
1329 else
1330 netif_carrier_off(info->netdev);
1331 }
1332#endif
1333 }
1334 if (status & MISCSTATUS_CTS_LATCHED)
1335 {
1336 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1337 usc_DisablestatusIrqs(info,SICR_CTS);
1338 icount->cts++;
1339 if ( status & MISCSTATUS_CTS )
1340 info->input_signal_events.cts_up++;
1341 else
1342 info->input_signal_events.cts_down++;
1343 }
1344 wake_up_interruptible(&info->status_event_wait_q);
1345 wake_up_interruptible(&info->event_wait_q);
1346
1347 if ( (info->port.flags & ASYNC_CHECK_CD) &&
1348 (status & MISCSTATUS_DCD_LATCHED) ) {
1349 if ( debug_level >= DEBUG_LEVEL_ISR )
1350 printk("%s CD now %s...", info->device_name,
1351 (status & MISCSTATUS_DCD) ? "on" : "off");
1352 if (status & MISCSTATUS_DCD)
1353 wake_up_interruptible(&info->port.open_wait);
1354 else {
1355 if ( debug_level >= DEBUG_LEVEL_ISR )
1356 printk("doing serial hangup...");
1357 if (info->port.tty)
1358 tty_hangup(info->port.tty);
1359 }
1360 }
1361
1362 if ( (info->port.flags & ASYNC_CTS_FLOW) &&
1363 (status & MISCSTATUS_CTS_LATCHED) ) {
1364 if (info->port.tty->hw_stopped) {
1365 if (status & MISCSTATUS_CTS) {
1366 if ( debug_level >= DEBUG_LEVEL_ISR )
1367 printk("CTS tx start...");
1368 if (info->port.tty)
1369 info->port.tty->hw_stopped = 0;
1370 usc_start_transmitter(info);
1371 info->pending_bh |= BH_TRANSMIT;
1372 return;
1373 }
1374 } else {
1375 if (!(status & MISCSTATUS_CTS)) {
1376 if ( debug_level >= DEBUG_LEVEL_ISR )
1377 printk("CTS tx stop...");
1378 if (info->port.tty)
1379 info->port.tty->hw_stopped = 1;
1380 usc_stop_transmitter(info);
1381 }
1382 }
1383 }
1384 }
1385
1386 info->pending_bh |= BH_STATUS;
1387
1388 /* for diagnostics set IRQ flag */
1389 if ( status & MISCSTATUS_TXC_LATCHED ){
1390 usc_OutReg( info, SICR,
1391 (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1392 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1393 info->irq_occurred = true;
1394 }
1395
1396} /* end of mgsl_isr_io_pin() */
1397
1398/* mgsl_isr_transmit_data()
1399 *
1400 * Service a transmit data interrupt (async mode only).
1401 *
1402 * Arguments: info pointer to device instance data
1403 * Return Value: None
1404 */
1405static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1406{
1407 if ( debug_level >= DEBUG_LEVEL_ISR )
1408 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1409 __FILE__,__LINE__,info->xmit_cnt);
1410
1411 usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1412
1413 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1414 usc_stop_transmitter(info);
1415 return;
1416 }
1417
1418 if ( info->xmit_cnt )
1419 usc_load_txfifo( info );
1420 else
1421 info->tx_active = false;
1422
1423 if (info->xmit_cnt < WAKEUP_CHARS)
1424 info->pending_bh |= BH_TRANSMIT;
1425
1426} /* end of mgsl_isr_transmit_data() */
1427
1428/* mgsl_isr_receive_data()
1429 *
1430 * Service a receive data interrupt. This occurs
1431 * when operating in asynchronous interrupt transfer mode.
1432 * The receive data FIFO is flushed to the receive data buffers.
1433 *
1434 * Arguments: info pointer to device instance data
1435 * Return Value: None
1436 */
1437static void mgsl_isr_receive_data( struct mgsl_struct *info )
1438{
1439 int Fifocount;
1440 u16 status;
1441 int work = 0;
1442 unsigned char DataByte;
1443 struct tty_struct *tty = info->port.tty;
1444 struct mgsl_icount *icount = &info->icount;
1445
1446 if ( debug_level >= DEBUG_LEVEL_ISR )
1447 printk("%s(%d):mgsl_isr_receive_data\n",
1448 __FILE__,__LINE__);
1449
1450 usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1451
1452 /* select FIFO status for RICR readback */
1453 usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1454
1455 /* clear the Wordstatus bit so that status readback */
1456 /* only reflects the status of this byte */
1457 usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1458
1459 /* flush the receive FIFO */
1460
1461 while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1462 int flag;
1463
1464 /* read one byte from RxFIFO */
1465 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1466 info->io_base + CCAR );
1467 DataByte = inb( info->io_base + CCAR );
1468
1469 /* get the status of the received byte */
1470 status = usc_InReg(info, RCSR);
1471 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1472 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
1473 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1474
1475 icount->rx++;
1476
1477 flag = 0;
1478 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1479 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
1480 printk("rxerr=%04X\n",status);
1481 /* update error statistics */
1482 if ( status & RXSTATUS_BREAK_RECEIVED ) {
1483 status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
1484 icount->brk++;
1485 } else if (status & RXSTATUS_PARITY_ERROR)
1486 icount->parity++;
1487 else if (status & RXSTATUS_FRAMING_ERROR)
1488 icount->frame++;
1489 else if (status & RXSTATUS_OVERRUN) {
1490 /* must issue purge fifo cmd before */
1491 /* 16C32 accepts more receive chars */
1492 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1493 icount->overrun++;
1494 }
1495
1496 /* discard char if tty control flags say so */
1497 if (status & info->ignore_status_mask)
1498 continue;
1499
1500 status &= info->read_status_mask;
1501
1502 if (status & RXSTATUS_BREAK_RECEIVED) {
1503 flag = TTY_BREAK;
1504 if (info->port.flags & ASYNC_SAK)
1505 do_SAK(tty);
1506 } else if (status & RXSTATUS_PARITY_ERROR)
1507 flag = TTY_PARITY;
1508 else if (status & RXSTATUS_FRAMING_ERROR)
1509 flag = TTY_FRAME;
1510 } /* end of if (error) */
1511 tty_insert_flip_char(tty, DataByte, flag);
1512 if (status & RXSTATUS_OVERRUN) {
1513 /* Overrun is special, since it's
1514 * reported immediately, and doesn't
1515 * affect the current character
1516 */
1517 work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1518 }
1519 }
1520
1521 if ( debug_level >= DEBUG_LEVEL_ISR ) {
1522 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1523 __FILE__,__LINE__,icount->rx,icount->brk,
1524 icount->parity,icount->frame,icount->overrun);
1525 }
1526
1527 if(work)
1528 tty_flip_buffer_push(tty);
1529}
1530
1531/* mgsl_isr_misc()
1532 *
1533 * Service a miscellaneous interrupt source.
1534 *
1535 * Arguments: info pointer to device extension (instance data)
1536 * Return Value: None
1537 */
1538static void mgsl_isr_misc( struct mgsl_struct *info )
1539{
1540 u16 status = usc_InReg( info, MISR );
1541
1542 if ( debug_level >= DEBUG_LEVEL_ISR )
1543 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1544 __FILE__,__LINE__,status);
1545
1546 if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1547 (info->params.mode == MGSL_MODE_HDLC)) {
1548
1549 /* turn off receiver and rx DMA */
1550 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1551 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1552 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1553 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
1554 usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
1555
1556 /* schedule BH handler to restart receiver */
1557 info->pending_bh |= BH_RECEIVE;
1558 info->rx_rcc_underrun = true;
1559 }
1560
1561 usc_ClearIrqPendingBits( info, MISC );
1562 usc_UnlatchMiscstatusBits( info, status );
1563
1564} /* end of mgsl_isr_misc() */
1565
1566/* mgsl_isr_null()
1567 *
1568 * Services undefined interrupt vectors from the
1569 * USC. (hence this function SHOULD never be called)
1570 *
1571 * Arguments: info pointer to device extension (instance data)
1572 * Return Value: None
1573 */
1574static void mgsl_isr_null( struct mgsl_struct *info )
1575{
1576
1577} /* end of mgsl_isr_null() */
1578
1579/* mgsl_isr_receive_dma()
1580 *
1581 * Service a receive DMA channel interrupt.
1582 * For this driver there are two sources of receive DMA interrupts
1583 * as identified in the Receive DMA mode Register (RDMR):
1584 *
1585 * BIT3 EOA/EOL End of List, all receive buffers in receive
1586 * buffer list have been filled (no more free buffers
1587 * available). The DMA controller has shut down.
1588 *
1589 * BIT2 EOB End of Buffer. This interrupt occurs when a receive
1590 * DMA buffer is terminated in response to completion
1591 * of a good frame or a frame with errors. The status
1592 * of the frame is stored in the buffer entry in the
1593 * list of receive buffer entries.
1594 *
1595 * Arguments: info pointer to device instance data
1596 * Return Value: None
1597 */
1598static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1599{
1600 u16 status;
1601
1602 /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1603 usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
1604
1605 /* Read the receive DMA status to identify interrupt type. */
1606 /* This also clears the status bits. */
1607 status = usc_InDmaReg( info, RDMR );
1608
1609 if ( debug_level >= DEBUG_LEVEL_ISR )
1610 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1611 __FILE__,__LINE__,info->device_name,status);
1612
1613 info->pending_bh |= BH_RECEIVE;
1614
1615 if ( status & BIT3 ) {
1616 info->rx_overflow = true;
1617 info->icount.buf_overrun++;
1618 }
1619
1620} /* end of mgsl_isr_receive_dma() */
1621
1622/* mgsl_isr_transmit_dma()
1623 *
1624 * This function services a transmit DMA channel interrupt.
1625 *
1626 * For this driver there is one source of transmit DMA interrupts
1627 * as identified in the Transmit DMA Mode Register (TDMR):
1628 *
1629 * BIT2 EOB End of Buffer. This interrupt occurs when a
1630 * transmit DMA buffer has been emptied.
1631 *
1632 * The driver maintains enough transmit DMA buffers to hold at least
1633 * one max frame size transmit frame. When operating in a buffered
1634 * transmit mode, there may be enough transmit DMA buffers to hold at
1635 * least two or more max frame size frames. On an EOB condition,
1636 * determine if there are any queued transmit buffers and copy into
1637 * transmit DMA buffers if we have room.
1638 *
1639 * Arguments: info pointer to device instance data
1640 * Return Value: None
1641 */
1642static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1643{
1644 u16 status;
1645
1646 /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1647 usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
1648
1649 /* Read the transmit DMA status to identify interrupt type. */
1650 /* This also clears the status bits. */
1651
1652 status = usc_InDmaReg( info, TDMR );
1653
1654 if ( debug_level >= DEBUG_LEVEL_ISR )
1655 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1656 __FILE__,__LINE__,info->device_name,status);
1657
1658 if ( status & BIT2 ) {
1659 --info->tx_dma_buffers_used;
1660
1661 /* if there are transmit frames queued,
1662 * try to load the next one
1663 */
1664 if ( load_next_tx_holding_buffer(info) ) {
1665 /* if call returns non-zero value, we have
1666 * at least one free tx holding buffer
1667 */
1668 info->pending_bh |= BH_TRANSMIT;
1669 }
1670 }
1671
1672} /* end of mgsl_isr_transmit_dma() */
1673
1674/* mgsl_interrupt()
1675 *
1676 * Interrupt service routine entry point.
1677 *
1678 * Arguments:
1679 *
1680 * irq interrupt number that caused interrupt
1681 * dev_id device ID supplied during interrupt registration
1682 *
1683 * Return Value: None
1684 */
1685static irqreturn_t mgsl_interrupt(int dummy, void *dev_id)
1686{
1687 struct mgsl_struct *info = dev_id;
1688 u16 UscVector;
1689 u16 DmaVector;
1690
1691 if ( debug_level >= DEBUG_LEVEL_ISR )
1692 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)entry.\n",
1693 __FILE__, __LINE__, info->irq_level);
1694
1695 spin_lock(&info->irq_spinlock);
1696
1697 for(;;) {
1698 /* Read the interrupt vectors from hardware. */
1699 UscVector = usc_InReg(info, IVR) >> 9;
1700 DmaVector = usc_InDmaReg(info, DIVR);
1701
1702 if ( debug_level >= DEBUG_LEVEL_ISR )
1703 printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1704 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1705
1706 if ( !UscVector && !DmaVector )
1707 break;
1708
1709 /* Dispatch interrupt vector */
1710 if ( UscVector )
1711 (*UscIsrTable[UscVector])(info);
1712 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1713 mgsl_isr_transmit_dma(info);
1714 else
1715 mgsl_isr_receive_dma(info);
1716
1717 if ( info->isr_overflow ) {
1718 printk(KERN_ERR "%s(%d):%s isr overflow irq=%d\n",
1719 __FILE__, __LINE__, info->device_name, info->irq_level);
1720 usc_DisableMasterIrqBit(info);
1721 usc_DisableDmaInterrupts(info,DICR_MASTER);
1722 break;
1723 }
1724 }
1725
1726 /* Request bottom half processing if there's something
1727 * for it to do and the bh is not already running
1728 */
1729
1730 if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1731 if ( debug_level >= DEBUG_LEVEL_ISR )
1732 printk("%s(%d):%s queueing bh task.\n",
1733 __FILE__,__LINE__,info->device_name);
1734 schedule_work(&info->task);
1735 info->bh_requested = true;
1736 }
1737
1738 spin_unlock(&info->irq_spinlock);
1739
1740 if ( debug_level >= DEBUG_LEVEL_ISR )
1741 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)exit.\n",
1742 __FILE__, __LINE__, info->irq_level);
1743
1744 return IRQ_HANDLED;
1745} /* end of mgsl_interrupt() */
1746
1747/* startup()
1748 *
1749 * Initialize and start device.
1750 *
1751 * Arguments: info pointer to device instance data
1752 * Return Value: 0 if success, otherwise error code
1753 */
1754static int startup(struct mgsl_struct * info)
1755{
1756 int retval = 0;
1757
1758 if ( debug_level >= DEBUG_LEVEL_INFO )
1759 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1760
1761 if (info->port.flags & ASYNC_INITIALIZED)
1762 return 0;
1763
1764 if (!info->xmit_buf) {
1765 /* allocate a page of memory for a transmit buffer */
1766 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1767 if (!info->xmit_buf) {
1768 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1769 __FILE__,__LINE__,info->device_name);
1770 return -ENOMEM;
1771 }
1772 }
1773
1774 info->pending_bh = 0;
1775
1776 memset(&info->icount, 0, sizeof(info->icount));
1777
1778 setup_timer(&info->tx_timer, mgsl_tx_timeout, (unsigned long)info);
1779
1780 /* Allocate and claim adapter resources */
1781 retval = mgsl_claim_resources(info);
1782
1783 /* perform existence check and diagnostics */
1784 if ( !retval )
1785 retval = mgsl_adapter_test(info);
1786
1787 if ( retval ) {
1788 if (capable(CAP_SYS_ADMIN) && info->port.tty)
1789 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1790 mgsl_release_resources(info);
1791 return retval;
1792 }
1793
1794 /* program hardware for current parameters */
1795 mgsl_change_params(info);
1796
1797 if (info->port.tty)
1798 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
1799
1800 info->port.flags |= ASYNC_INITIALIZED;
1801
1802 return 0;
1803
1804} /* end of startup() */
1805
1806/* shutdown()
1807 *
1808 * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1809 *
1810 * Arguments: info pointer to device instance data
1811 * Return Value: None
1812 */
1813static void shutdown(struct mgsl_struct * info)
1814{
1815 unsigned long flags;
1816
1817 if (!(info->port.flags & ASYNC_INITIALIZED))
1818 return;
1819
1820 if (debug_level >= DEBUG_LEVEL_INFO)
1821 printk("%s(%d):mgsl_shutdown(%s)\n",
1822 __FILE__,__LINE__, info->device_name );
1823
1824 /* clear status wait queue because status changes */
1825 /* can't happen after shutting down the hardware */
1826 wake_up_interruptible(&info->status_event_wait_q);
1827 wake_up_interruptible(&info->event_wait_q);
1828
1829 del_timer_sync(&info->tx_timer);
1830
1831 if (info->xmit_buf) {
1832 free_page((unsigned long) info->xmit_buf);
1833 info->xmit_buf = NULL;
1834 }
1835
1836 spin_lock_irqsave(&info->irq_spinlock,flags);
1837 usc_DisableMasterIrqBit(info);
1838 usc_stop_receiver(info);
1839 usc_stop_transmitter(info);
1840 usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
1841 TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
1842 usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1843
1844 /* Disable DMAEN (Port 7, Bit 14) */
1845 /* This disconnects the DMA request signal from the ISA bus */
1846 /* on the ISA adapter. This has no effect for the PCI adapter */
1847 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1848
1849 /* Disable INTEN (Port 6, Bit12) */
1850 /* This disconnects the IRQ request signal to the ISA bus */
1851 /* on the ISA adapter. This has no effect for the PCI adapter */
1852 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1853
1854 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
1855 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1856 usc_set_serial_signals(info);
1857 }
1858
1859 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1860
1861 mgsl_release_resources(info);
1862
1863 if (info->port.tty)
1864 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1865
1866 info->port.flags &= ~ASYNC_INITIALIZED;
1867
1868} /* end of shutdown() */
1869
1870static void mgsl_program_hw(struct mgsl_struct *info)
1871{
1872 unsigned long flags;
1873
1874 spin_lock_irqsave(&info->irq_spinlock,flags);
1875
1876 usc_stop_receiver(info);
1877 usc_stop_transmitter(info);
1878 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1879
1880 if (info->params.mode == MGSL_MODE_HDLC ||
1881 info->params.mode == MGSL_MODE_RAW ||
1882 info->netcount)
1883 usc_set_sync_mode(info);
1884 else
1885 usc_set_async_mode(info);
1886
1887 usc_set_serial_signals(info);
1888
1889 info->dcd_chkcount = 0;
1890 info->cts_chkcount = 0;
1891 info->ri_chkcount = 0;
1892 info->dsr_chkcount = 0;
1893
1894 usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
1895 usc_EnableInterrupts(info, IO_PIN);
1896 usc_get_serial_signals(info);
1897
1898 if (info->netcount || info->port.tty->termios->c_cflag & CREAD)
1899 usc_start_receiver(info);
1900
1901 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1902}
1903
1904/* Reconfigure adapter based on new parameters
1905 */
1906static void mgsl_change_params(struct mgsl_struct *info)
1907{
1908 unsigned cflag;
1909 int bits_per_char;
1910
1911 if (!info->port.tty || !info->port.tty->termios)
1912 return;
1913
1914 if (debug_level >= DEBUG_LEVEL_INFO)
1915 printk("%s(%d):mgsl_change_params(%s)\n",
1916 __FILE__,__LINE__, info->device_name );
1917
1918 cflag = info->port.tty->termios->c_cflag;
1919
1920 /* if B0 rate (hangup) specified then negate DTR and RTS */
1921 /* otherwise assert DTR and RTS */
1922 if (cflag & CBAUD)
1923 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1924 else
1925 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1926
1927 /* byte size and parity */
1928
1929 switch (cflag & CSIZE) {
1930 case CS5: info->params.data_bits = 5; break;
1931 case CS6: info->params.data_bits = 6; break;
1932 case CS7: info->params.data_bits = 7; break;
1933 case CS8: info->params.data_bits = 8; break;
1934 /* Never happens, but GCC is too dumb to figure it out */
1935 default: info->params.data_bits = 7; break;
1936 }
1937
1938 if (cflag & CSTOPB)
1939 info->params.stop_bits = 2;
1940 else
1941 info->params.stop_bits = 1;
1942
1943 info->params.parity = ASYNC_PARITY_NONE;
1944 if (cflag & PARENB) {
1945 if (cflag & PARODD)
1946 info->params.parity = ASYNC_PARITY_ODD;
1947 else
1948 info->params.parity = ASYNC_PARITY_EVEN;
1949#ifdef CMSPAR
1950 if (cflag & CMSPAR)
1951 info->params.parity = ASYNC_PARITY_SPACE;
1952#endif
1953 }
1954
1955 /* calculate number of jiffies to transmit a full
1956 * FIFO (32 bytes) at specified data rate
1957 */
1958 bits_per_char = info->params.data_bits +
1959 info->params.stop_bits + 1;
1960
1961 /* if port data rate is set to 460800 or less then
1962 * allow tty settings to override, otherwise keep the
1963 * current data rate.
1964 */
1965 if (info->params.data_rate <= 460800)
1966 info->params.data_rate = tty_get_baud_rate(info->port.tty);
1967
1968 if ( info->params.data_rate ) {
1969 info->timeout = (32*HZ*bits_per_char) /
1970 info->params.data_rate;
1971 }
1972 info->timeout += HZ/50; /* Add .02 seconds of slop */
1973
1974 if (cflag & CRTSCTS)
1975 info->port.flags |= ASYNC_CTS_FLOW;
1976 else
1977 info->port.flags &= ~ASYNC_CTS_FLOW;
1978
1979 if (cflag & CLOCAL)
1980 info->port.flags &= ~ASYNC_CHECK_CD;
1981 else
1982 info->port.flags |= ASYNC_CHECK_CD;
1983
1984 /* process tty input control flags */
1985
1986 info->read_status_mask = RXSTATUS_OVERRUN;
1987 if (I_INPCK(info->port.tty))
1988 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
1989 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
1990 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
1991
1992 if (I_IGNPAR(info->port.tty))
1993 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
1994 if (I_IGNBRK(info->port.tty)) {
1995 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
1996 /* If ignoring parity and break indicators, ignore
1997 * overruns too. (For real raw support).
1998 */
1999 if (I_IGNPAR(info->port.tty))
2000 info->ignore_status_mask |= RXSTATUS_OVERRUN;
2001 }
2002
2003 mgsl_program_hw(info);
2004
2005} /* end of mgsl_change_params() */
2006
2007/* mgsl_put_char()
2008 *
2009 * Add a character to the transmit buffer.
2010 *
2011 * Arguments: tty pointer to tty information structure
2012 * ch character to add to transmit buffer
2013 *
2014 * Return Value: None
2015 */
2016static int mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2017{
2018 struct mgsl_struct *info = tty->driver_data;
2019 unsigned long flags;
2020 int ret = 0;
2021
2022 if (debug_level >= DEBUG_LEVEL_INFO) {
2023 printk(KERN_DEBUG "%s(%d):mgsl_put_char(%d) on %s\n",
2024 __FILE__, __LINE__, ch, info->device_name);
2025 }
2026
2027 if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2028 return 0;
2029
2030 if (!info->xmit_buf)
2031 return 0;
2032
2033 spin_lock_irqsave(&info->irq_spinlock, flags);
2034
2035 if ((info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active) {
2036 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2037 info->xmit_buf[info->xmit_head++] = ch;
2038 info->xmit_head &= SERIAL_XMIT_SIZE-1;
2039 info->xmit_cnt++;
2040 ret = 1;
2041 }
2042 }
2043 spin_unlock_irqrestore(&info->irq_spinlock, flags);
2044 return ret;
2045
2046} /* end of mgsl_put_char() */
2047
2048/* mgsl_flush_chars()
2049 *
2050 * Enable transmitter so remaining characters in the
2051 * transmit buffer are sent.
2052 *
2053 * Arguments: tty pointer to tty information structure
2054 * Return Value: None
2055 */
2056static void mgsl_flush_chars(struct tty_struct *tty)
2057{
2058 struct mgsl_struct *info = tty->driver_data;
2059 unsigned long flags;
2060
2061 if ( debug_level >= DEBUG_LEVEL_INFO )
2062 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2063 __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2064
2065 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2066 return;
2067
2068 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2069 !info->xmit_buf)
2070 return;
2071
2072 if ( debug_level >= DEBUG_LEVEL_INFO )
2073 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2074 __FILE__,__LINE__,info->device_name );
2075
2076 spin_lock_irqsave(&info->irq_spinlock,flags);
2077
2078 if (!info->tx_active) {
2079 if ( (info->params.mode == MGSL_MODE_HDLC ||
2080 info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2081 /* operating in synchronous (frame oriented) mode */
2082 /* copy data from circular xmit_buf to */
2083 /* transmit DMA buffer. */
2084 mgsl_load_tx_dma_buffer(info,
2085 info->xmit_buf,info->xmit_cnt);
2086 }
2087 usc_start_transmitter(info);
2088 }
2089
2090 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2091
2092} /* end of mgsl_flush_chars() */
2093
2094/* mgsl_write()
2095 *
2096 * Send a block of data
2097 *
2098 * Arguments:
2099 *
2100 * tty pointer to tty information structure
2101 * buf pointer to buffer containing send data
2102 * count size of send data in bytes
2103 *
2104 * Return Value: number of characters written
2105 */
2106static int mgsl_write(struct tty_struct * tty,
2107 const unsigned char *buf, int count)
2108{
2109 int c, ret = 0;
2110 struct mgsl_struct *info = tty->driver_data;
2111 unsigned long flags;
2112
2113 if ( debug_level >= DEBUG_LEVEL_INFO )
2114 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2115 __FILE__,__LINE__,info->device_name,count);
2116
2117 if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2118 goto cleanup;
2119
2120 if (!info->xmit_buf)
2121 goto cleanup;
2122
2123 if ( info->params.mode == MGSL_MODE_HDLC ||
2124 info->params.mode == MGSL_MODE_RAW ) {
2125 /* operating in synchronous (frame oriented) mode */
2126 if (info->tx_active) {
2127
2128 if ( info->params.mode == MGSL_MODE_HDLC ) {
2129 ret = 0;
2130 goto cleanup;
2131 }
2132 /* transmitter is actively sending data -
2133 * if we have multiple transmit dma and
2134 * holding buffers, attempt to queue this
2135 * frame for transmission at a later time.
2136 */
2137 if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2138 /* no tx holding buffers available */
2139 ret = 0;
2140 goto cleanup;
2141 }
2142
2143 /* queue transmit frame request */
2144 ret = count;
2145 save_tx_buffer_request(info,buf,count);
2146
2147 /* if we have sufficient tx dma buffers,
2148 * load the next buffered tx request
2149 */
2150 spin_lock_irqsave(&info->irq_spinlock,flags);
2151 load_next_tx_holding_buffer(info);
2152 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2153 goto cleanup;
2154 }
2155
2156 /* if operating in HDLC LoopMode and the adapter */
2157 /* has yet to be inserted into the loop, we can't */
2158 /* transmit */
2159
2160 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2161 !usc_loopmode_active(info) )
2162 {
2163 ret = 0;
2164 goto cleanup;
2165 }
2166
2167 if ( info->xmit_cnt ) {
2168 /* Send accumulated from send_char() calls */
2169 /* as frame and wait before accepting more data. */
2170 ret = 0;
2171
2172 /* copy data from circular xmit_buf to */
2173 /* transmit DMA buffer. */
2174 mgsl_load_tx_dma_buffer(info,
2175 info->xmit_buf,info->xmit_cnt);
2176 if ( debug_level >= DEBUG_LEVEL_INFO )
2177 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2178 __FILE__,__LINE__,info->device_name);
2179 } else {
2180 if ( debug_level >= DEBUG_LEVEL_INFO )
2181 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2182 __FILE__,__LINE__,info->device_name);
2183 ret = count;
2184 info->xmit_cnt = count;
2185 mgsl_load_tx_dma_buffer(info,buf,count);
2186 }
2187 } else {
2188 while (1) {
2189 spin_lock_irqsave(&info->irq_spinlock,flags);
2190 c = min_t(int, count,
2191 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2192 SERIAL_XMIT_SIZE - info->xmit_head));
2193 if (c <= 0) {
2194 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2195 break;
2196 }
2197 memcpy(info->xmit_buf + info->xmit_head, buf, c);
2198 info->xmit_head = ((info->xmit_head + c) &
2199 (SERIAL_XMIT_SIZE-1));
2200 info->xmit_cnt += c;
2201 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2202 buf += c;
2203 count -= c;
2204 ret += c;
2205 }
2206 }
2207
2208 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2209 spin_lock_irqsave(&info->irq_spinlock,flags);
2210 if (!info->tx_active)
2211 usc_start_transmitter(info);
2212 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2213 }
2214cleanup:
2215 if ( debug_level >= DEBUG_LEVEL_INFO )
2216 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2217 __FILE__,__LINE__,info->device_name,ret);
2218
2219 return ret;
2220
2221} /* end of mgsl_write() */
2222
2223/* mgsl_write_room()
2224 *
2225 * Return the count of free bytes in transmit buffer
2226 *
2227 * Arguments: tty pointer to tty info structure
2228 * Return Value: None
2229 */
2230static int mgsl_write_room(struct tty_struct *tty)
2231{
2232 struct mgsl_struct *info = tty->driver_data;
2233 int ret;
2234
2235 if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2236 return 0;
2237 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2238 if (ret < 0)
2239 ret = 0;
2240
2241 if (debug_level >= DEBUG_LEVEL_INFO)
2242 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2243 __FILE__,__LINE__, info->device_name,ret );
2244
2245 if ( info->params.mode == MGSL_MODE_HDLC ||
2246 info->params.mode == MGSL_MODE_RAW ) {
2247 /* operating in synchronous (frame oriented) mode */
2248 if ( info->tx_active )
2249 return 0;
2250 else
2251 return HDLC_MAX_FRAME_SIZE;
2252 }
2253
2254 return ret;
2255
2256} /* end of mgsl_write_room() */
2257
2258/* mgsl_chars_in_buffer()
2259 *
2260 * Return the count of bytes in transmit buffer
2261 *
2262 * Arguments: tty pointer to tty info structure
2263 * Return Value: None
2264 */
2265static int mgsl_chars_in_buffer(struct tty_struct *tty)
2266{
2267 struct mgsl_struct *info = tty->driver_data;
2268
2269 if (debug_level >= DEBUG_LEVEL_INFO)
2270 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2271 __FILE__,__LINE__, info->device_name );
2272
2273 if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2274 return 0;
2275
2276 if (debug_level >= DEBUG_LEVEL_INFO)
2277 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2278 __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2279
2280 if ( info->params.mode == MGSL_MODE_HDLC ||
2281 info->params.mode == MGSL_MODE_RAW ) {
2282 /* operating in synchronous (frame oriented) mode */
2283 if ( info->tx_active )
2284 return info->max_frame_size;
2285 else
2286 return 0;
2287 }
2288
2289 return info->xmit_cnt;
2290} /* end of mgsl_chars_in_buffer() */
2291
2292/* mgsl_flush_buffer()
2293 *
2294 * Discard all data in the send buffer
2295 *
2296 * Arguments: tty pointer to tty info structure
2297 * Return Value: None
2298 */
2299static void mgsl_flush_buffer(struct tty_struct *tty)
2300{
2301 struct mgsl_struct *info = tty->driver_data;
2302 unsigned long flags;
2303
2304 if (debug_level >= DEBUG_LEVEL_INFO)
2305 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2306 __FILE__,__LINE__, info->device_name );
2307
2308 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2309 return;
2310
2311 spin_lock_irqsave(&info->irq_spinlock,flags);
2312 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2313 del_timer(&info->tx_timer);
2314 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2315
2316 tty_wakeup(tty);
2317}
2318
2319/* mgsl_send_xchar()
2320 *
2321 * Send a high-priority XON/XOFF character
2322 *
2323 * Arguments: tty pointer to tty info structure
2324 * ch character to send
2325 * Return Value: None
2326 */
2327static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2328{
2329 struct mgsl_struct *info = tty->driver_data;
2330 unsigned long flags;
2331
2332 if (debug_level >= DEBUG_LEVEL_INFO)
2333 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2334 __FILE__,__LINE__, info->device_name, ch );
2335
2336 if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2337 return;
2338
2339 info->x_char = ch;
2340 if (ch) {
2341 /* Make sure transmit interrupts are on */
2342 spin_lock_irqsave(&info->irq_spinlock,flags);
2343 if (!info->tx_enabled)
2344 usc_start_transmitter(info);
2345 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2346 }
2347} /* end of mgsl_send_xchar() */
2348
2349/* mgsl_throttle()
2350 *
2351 * Signal remote device to throttle send data (our receive data)
2352 *
2353 * Arguments: tty pointer to tty info structure
2354 * Return Value: None
2355 */
2356static void mgsl_throttle(struct tty_struct * tty)
2357{
2358 struct mgsl_struct *info = tty->driver_data;
2359 unsigned long flags;
2360
2361 if (debug_level >= DEBUG_LEVEL_INFO)
2362 printk("%s(%d):mgsl_throttle(%s) entry\n",
2363 __FILE__,__LINE__, info->device_name );
2364
2365 if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2366 return;
2367
2368 if (I_IXOFF(tty))
2369 mgsl_send_xchar(tty, STOP_CHAR(tty));
2370
2371 if (tty->termios->c_cflag & CRTSCTS) {
2372 spin_lock_irqsave(&info->irq_spinlock,flags);
2373 info->serial_signals &= ~SerialSignal_RTS;
2374 usc_set_serial_signals(info);
2375 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2376 }
2377} /* end of mgsl_throttle() */
2378
2379/* mgsl_unthrottle()
2380 *
2381 * Signal remote device to stop throttling send data (our receive data)
2382 *
2383 * Arguments: tty pointer to tty info structure
2384 * Return Value: None
2385 */
2386static void mgsl_unthrottle(struct tty_struct * tty)
2387{
2388 struct mgsl_struct *info = tty->driver_data;
2389 unsigned long flags;
2390
2391 if (debug_level >= DEBUG_LEVEL_INFO)
2392 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2393 __FILE__,__LINE__, info->device_name );
2394
2395 if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2396 return;
2397
2398 if (I_IXOFF(tty)) {
2399 if (info->x_char)
2400 info->x_char = 0;
2401 else
2402 mgsl_send_xchar(tty, START_CHAR(tty));
2403 }
2404
2405 if (tty->termios->c_cflag & CRTSCTS) {
2406 spin_lock_irqsave(&info->irq_spinlock,flags);
2407 info->serial_signals |= SerialSignal_RTS;
2408 usc_set_serial_signals(info);
2409 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2410 }
2411
2412} /* end of mgsl_unthrottle() */
2413
2414/* mgsl_get_stats()
2415 *
2416 * get the current serial parameters information
2417 *
2418 * Arguments: info pointer to device instance data
2419 * user_icount pointer to buffer to hold returned stats
2420 *
2421 * Return Value: 0 if success, otherwise error code
2422 */
2423static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2424{
2425 int err;
2426
2427 if (debug_level >= DEBUG_LEVEL_INFO)
2428 printk("%s(%d):mgsl_get_params(%s)\n",
2429 __FILE__,__LINE__, info->device_name);
2430
2431 if (!user_icount) {
2432 memset(&info->icount, 0, sizeof(info->icount));
2433 } else {
2434 mutex_lock(&info->port.mutex);
2435 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2436 mutex_unlock(&info->port.mutex);
2437 if (err)
2438 return -EFAULT;
2439 }
2440
2441 return 0;
2442
2443} /* end of mgsl_get_stats() */
2444
2445/* mgsl_get_params()
2446 *
2447 * get the current serial parameters information
2448 *
2449 * Arguments: info pointer to device instance data
2450 * user_params pointer to buffer to hold returned params
2451 *
2452 * Return Value: 0 if success, otherwise error code
2453 */
2454static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2455{
2456 int err;
2457 if (debug_level >= DEBUG_LEVEL_INFO)
2458 printk("%s(%d):mgsl_get_params(%s)\n",
2459 __FILE__,__LINE__, info->device_name);
2460
2461 mutex_lock(&info->port.mutex);
2462 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2463 mutex_unlock(&info->port.mutex);
2464 if (err) {
2465 if ( debug_level >= DEBUG_LEVEL_INFO )
2466 printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2467 __FILE__,__LINE__,info->device_name);
2468 return -EFAULT;
2469 }
2470
2471 return 0;
2472
2473} /* end of mgsl_get_params() */
2474
2475/* mgsl_set_params()
2476 *
2477 * set the serial parameters
2478 *
2479 * Arguments:
2480 *
2481 * info pointer to device instance data
2482 * new_params user buffer containing new serial params
2483 *
2484 * Return Value: 0 if success, otherwise error code
2485 */
2486static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2487{
2488 unsigned long flags;
2489 MGSL_PARAMS tmp_params;
2490 int err;
2491
2492 if (debug_level >= DEBUG_LEVEL_INFO)
2493 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2494 info->device_name );
2495 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2496 if (err) {
2497 if ( debug_level >= DEBUG_LEVEL_INFO )
2498 printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2499 __FILE__,__LINE__,info->device_name);
2500 return -EFAULT;
2501 }
2502
2503 mutex_lock(&info->port.mutex);
2504 spin_lock_irqsave(&info->irq_spinlock,flags);
2505 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2506 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2507
2508 mgsl_change_params(info);
2509 mutex_unlock(&info->port.mutex);
2510
2511 return 0;
2512
2513} /* end of mgsl_set_params() */
2514
2515/* mgsl_get_txidle()
2516 *
2517 * get the current transmit idle mode
2518 *
2519 * Arguments: info pointer to device instance data
2520 * idle_mode pointer to buffer to hold returned idle mode
2521 *
2522 * Return Value: 0 if success, otherwise error code
2523 */
2524static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2525{
2526 int err;
2527
2528 if (debug_level >= DEBUG_LEVEL_INFO)
2529 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2530 __FILE__,__LINE__, info->device_name, info->idle_mode);
2531
2532 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2533 if (err) {
2534 if ( debug_level >= DEBUG_LEVEL_INFO )
2535 printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2536 __FILE__,__LINE__,info->device_name);
2537 return -EFAULT;
2538 }
2539
2540 return 0;
2541
2542} /* end of mgsl_get_txidle() */
2543
2544/* mgsl_set_txidle() service ioctl to set transmit idle mode
2545 *
2546 * Arguments: info pointer to device instance data
2547 * idle_mode new idle mode
2548 *
2549 * Return Value: 0 if success, otherwise error code
2550 */
2551static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2552{
2553 unsigned long flags;
2554
2555 if (debug_level >= DEBUG_LEVEL_INFO)
2556 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2557 info->device_name, idle_mode );
2558
2559 spin_lock_irqsave(&info->irq_spinlock,flags);
2560 info->idle_mode = idle_mode;
2561 usc_set_txidle( info );
2562 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2563 return 0;
2564
2565} /* end of mgsl_set_txidle() */
2566
2567/* mgsl_txenable()
2568 *
2569 * enable or disable the transmitter
2570 *
2571 * Arguments:
2572 *
2573 * info pointer to device instance data
2574 * enable 1 = enable, 0 = disable
2575 *
2576 * Return Value: 0 if success, otherwise error code
2577 */
2578static int mgsl_txenable(struct mgsl_struct * info, int enable)
2579{
2580 unsigned long flags;
2581
2582 if (debug_level >= DEBUG_LEVEL_INFO)
2583 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2584 info->device_name, enable);
2585
2586 spin_lock_irqsave(&info->irq_spinlock,flags);
2587 if ( enable ) {
2588 if ( !info->tx_enabled ) {
2589
2590 usc_start_transmitter(info);
2591 /*--------------------------------------------------
2592 * if HDLC/SDLC Loop mode, attempt to insert the
2593 * station in the 'loop' by setting CMR:13. Upon
2594 * receipt of the next GoAhead (RxAbort) sequence,
2595 * the OnLoop indicator (CCSR:7) should go active
2596 * to indicate that we are on the loop
2597 *--------------------------------------------------*/
2598 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2599 usc_loopmode_insert_request( info );
2600 }
2601 } else {
2602 if ( info->tx_enabled )
2603 usc_stop_transmitter(info);
2604 }
2605 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2606 return 0;
2607
2608} /* end of mgsl_txenable() */
2609
2610/* mgsl_txabort() abort send HDLC frame
2611 *
2612 * Arguments: info pointer to device instance data
2613 * Return Value: 0 if success, otherwise error code
2614 */
2615static int mgsl_txabort(struct mgsl_struct * info)
2616{
2617 unsigned long flags;
2618
2619 if (debug_level >= DEBUG_LEVEL_INFO)
2620 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2621 info->device_name);
2622
2623 spin_lock_irqsave(&info->irq_spinlock,flags);
2624 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2625 {
2626 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2627 usc_loopmode_cancel_transmit( info );
2628 else
2629 usc_TCmd(info,TCmd_SendAbort);
2630 }
2631 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2632 return 0;
2633
2634} /* end of mgsl_txabort() */
2635
2636/* mgsl_rxenable() enable or disable the receiver
2637 *
2638 * Arguments: info pointer to device instance data
2639 * enable 1 = enable, 0 = disable
2640 * Return Value: 0 if success, otherwise error code
2641 */
2642static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2643{
2644 unsigned long flags;
2645
2646 if (debug_level >= DEBUG_LEVEL_INFO)
2647 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2648 info->device_name, enable);
2649
2650 spin_lock_irqsave(&info->irq_spinlock,flags);
2651 if ( enable ) {
2652 if ( !info->rx_enabled )
2653 usc_start_receiver(info);
2654 } else {
2655 if ( info->rx_enabled )
2656 usc_stop_receiver(info);
2657 }
2658 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2659 return 0;
2660
2661} /* end of mgsl_rxenable() */
2662
2663/* mgsl_wait_event() wait for specified event to occur
2664 *
2665 * Arguments: info pointer to device instance data
2666 * mask pointer to bitmask of events to wait for
2667 * Return Value: 0 if successful and bit mask updated with
2668 * of events triggerred,
2669 * otherwise error code
2670 */
2671static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2672{
2673 unsigned long flags;
2674 int s;
2675 int rc=0;
2676 struct mgsl_icount cprev, cnow;
2677 int events;
2678 int mask;
2679 struct _input_signal_events oldsigs, newsigs;
2680 DECLARE_WAITQUEUE(wait, current);
2681
2682 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2683 if (rc) {
2684 return -EFAULT;
2685 }
2686
2687 if (debug_level >= DEBUG_LEVEL_INFO)
2688 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2689 info->device_name, mask);
2690
2691 spin_lock_irqsave(&info->irq_spinlock,flags);
2692
2693 /* return immediately if state matches requested events */
2694 usc_get_serial_signals(info);
2695 s = info->serial_signals;
2696 events = mask &
2697 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2698 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2699 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2700 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2701 if (events) {
2702 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2703 goto exit;
2704 }
2705
2706 /* save current irq counts */
2707 cprev = info->icount;
2708 oldsigs = info->input_signal_events;
2709
2710 /* enable hunt and idle irqs if needed */
2711 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2712 u16 oldreg = usc_InReg(info,RICR);
2713 u16 newreg = oldreg +
2714 (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2715 (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2716 if (oldreg != newreg)
2717 usc_OutReg(info, RICR, newreg);
2718 }
2719
2720 set_current_state(TASK_INTERRUPTIBLE);
2721 add_wait_queue(&info->event_wait_q, &wait);
2722
2723 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2724
2725
2726 for(;;) {
2727 schedule();
2728 if (signal_pending(current)) {
2729 rc = -ERESTARTSYS;
2730 break;
2731 }
2732
2733 /* get current irq counts */
2734 spin_lock_irqsave(&info->irq_spinlock,flags);
2735 cnow = info->icount;
2736 newsigs = info->input_signal_events;
2737 set_current_state(TASK_INTERRUPTIBLE);
2738 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2739
2740 /* if no change, wait aborted for some reason */
2741 if (newsigs.dsr_up == oldsigs.dsr_up &&
2742 newsigs.dsr_down == oldsigs.dsr_down &&
2743 newsigs.dcd_up == oldsigs.dcd_up &&
2744 newsigs.dcd_down == oldsigs.dcd_down &&
2745 newsigs.cts_up == oldsigs.cts_up &&
2746 newsigs.cts_down == oldsigs.cts_down &&
2747 newsigs.ri_up == oldsigs.ri_up &&
2748 newsigs.ri_down == oldsigs.ri_down &&
2749 cnow.exithunt == cprev.exithunt &&
2750 cnow.rxidle == cprev.rxidle) {
2751 rc = -EIO;
2752 break;
2753 }
2754
2755 events = mask &
2756 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2757 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2758 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2759 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2760 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2761 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2762 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2763 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2764 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2765 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2766 if (events)
2767 break;
2768
2769 cprev = cnow;
2770 oldsigs = newsigs;
2771 }
2772
2773 remove_wait_queue(&info->event_wait_q, &wait);
2774 set_current_state(TASK_RUNNING);
2775
2776 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2777 spin_lock_irqsave(&info->irq_spinlock,flags);
2778 if (!waitqueue_active(&info->event_wait_q)) {
2779 /* disable enable exit hunt mode/idle rcvd IRQs */
2780 usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2781 ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
2782 }
2783 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2784 }
2785exit:
2786 if ( rc == 0 )
2787 PUT_USER(rc, events, mask_ptr);
2788
2789 return rc;
2790
2791} /* end of mgsl_wait_event() */
2792
2793static int modem_input_wait(struct mgsl_struct *info,int arg)
2794{
2795 unsigned long flags;
2796 int rc;
2797 struct mgsl_icount cprev, cnow;
2798 DECLARE_WAITQUEUE(wait, current);
2799
2800 /* save current irq counts */
2801 spin_lock_irqsave(&info->irq_spinlock,flags);
2802 cprev = info->icount;
2803 add_wait_queue(&info->status_event_wait_q, &wait);
2804 set_current_state(TASK_INTERRUPTIBLE);
2805 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2806
2807 for(;;) {
2808 schedule();
2809 if (signal_pending(current)) {
2810 rc = -ERESTARTSYS;
2811 break;
2812 }
2813
2814 /* get new irq counts */
2815 spin_lock_irqsave(&info->irq_spinlock,flags);
2816 cnow = info->icount;
2817 set_current_state(TASK_INTERRUPTIBLE);
2818 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2819
2820 /* if no change, wait aborted for some reason */
2821 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2822 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2823 rc = -EIO;
2824 break;
2825 }
2826
2827 /* check for change in caller specified modem input */
2828 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2829 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2830 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2831 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2832 rc = 0;
2833 break;
2834 }
2835
2836 cprev = cnow;
2837 }
2838 remove_wait_queue(&info->status_event_wait_q, &wait);
2839 set_current_state(TASK_RUNNING);
2840 return rc;
2841}
2842
2843/* return the state of the serial control and status signals
2844 */
2845static int tiocmget(struct tty_struct *tty)
2846{
2847 struct mgsl_struct *info = tty->driver_data;
2848 unsigned int result;
2849 unsigned long flags;
2850
2851 spin_lock_irqsave(&info->irq_spinlock,flags);
2852 usc_get_serial_signals(info);
2853 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2854
2855 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2856 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2857 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2858 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2859 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2860 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2861
2862 if (debug_level >= DEBUG_LEVEL_INFO)
2863 printk("%s(%d):%s tiocmget() value=%08X\n",
2864 __FILE__,__LINE__, info->device_name, result );
2865 return result;
2866}
2867
2868/* set modem control signals (DTR/RTS)
2869 */
2870static int tiocmset(struct tty_struct *tty,
2871 unsigned int set, unsigned int clear)
2872{
2873 struct mgsl_struct *info = tty->driver_data;
2874 unsigned long flags;
2875
2876 if (debug_level >= DEBUG_LEVEL_INFO)
2877 printk("%s(%d):%s tiocmset(%x,%x)\n",
2878 __FILE__,__LINE__,info->device_name, set, clear);
2879
2880 if (set & TIOCM_RTS)
2881 info->serial_signals |= SerialSignal_RTS;
2882 if (set & TIOCM_DTR)
2883 info->serial_signals |= SerialSignal_DTR;
2884 if (clear & TIOCM_RTS)
2885 info->serial_signals &= ~SerialSignal_RTS;
2886 if (clear & TIOCM_DTR)
2887 info->serial_signals &= ~SerialSignal_DTR;
2888
2889 spin_lock_irqsave(&info->irq_spinlock,flags);
2890 usc_set_serial_signals(info);
2891 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2892
2893 return 0;
2894}
2895
2896/* mgsl_break() Set or clear transmit break condition
2897 *
2898 * Arguments: tty pointer to tty instance data
2899 * break_state -1=set break condition, 0=clear
2900 * Return Value: error code
2901 */
2902static int mgsl_break(struct tty_struct *tty, int break_state)
2903{
2904 struct mgsl_struct * info = tty->driver_data;
2905 unsigned long flags;
2906
2907 if (debug_level >= DEBUG_LEVEL_INFO)
2908 printk("%s(%d):mgsl_break(%s,%d)\n",
2909 __FILE__,__LINE__, info->device_name, break_state);
2910
2911 if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2912 return -EINVAL;
2913
2914 spin_lock_irqsave(&info->irq_spinlock,flags);
2915 if (break_state == -1)
2916 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2917 else
2918 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2919 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2920 return 0;
2921
2922} /* end of mgsl_break() */
2923
2924/*
2925 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
2926 * Return: write counters to the user passed counter struct
2927 * NB: both 1->0 and 0->1 transitions are counted except for
2928 * RI where only 0->1 is counted.
2929 */
2930static int msgl_get_icount(struct tty_struct *tty,
2931 struct serial_icounter_struct *icount)
2932
2933{
2934 struct mgsl_struct * info = tty->driver_data;
2935 struct mgsl_icount cnow; /* kernel counter temps */
2936 unsigned long flags;
2937
2938 spin_lock_irqsave(&info->irq_spinlock,flags);
2939 cnow = info->icount;
2940 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2941
2942 icount->cts = cnow.cts;
2943 icount->dsr = cnow.dsr;
2944 icount->rng = cnow.rng;
2945 icount->dcd = cnow.dcd;
2946 icount->rx = cnow.rx;
2947 icount->tx = cnow.tx;
2948 icount->frame = cnow.frame;
2949 icount->overrun = cnow.overrun;
2950 icount->parity = cnow.parity;
2951 icount->brk = cnow.brk;
2952 icount->buf_overrun = cnow.buf_overrun;
2953 return 0;
2954}
2955
2956/* mgsl_ioctl() Service an IOCTL request
2957 *
2958 * Arguments:
2959 *
2960 * tty pointer to tty instance data
2961 * cmd IOCTL command code
2962 * arg command argument/context
2963 *
2964 * Return Value: 0 if success, otherwise error code
2965 */
2966static int mgsl_ioctl(struct tty_struct *tty,
2967 unsigned int cmd, unsigned long arg)
2968{
2969 struct mgsl_struct * info = tty->driver_data;
2970
2971 if (debug_level >= DEBUG_LEVEL_INFO)
2972 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2973 info->device_name, cmd );
2974
2975 if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2976 return -ENODEV;
2977
2978 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2979 (cmd != TIOCMIWAIT)) {
2980 if (tty->flags & (1 << TTY_IO_ERROR))
2981 return -EIO;
2982 }
2983
2984 return mgsl_ioctl_common(info, cmd, arg);
2985}
2986
2987static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2988{
2989 void __user *argp = (void __user *)arg;
2990
2991 switch (cmd) {
2992 case MGSL_IOCGPARAMS:
2993 return mgsl_get_params(info, argp);
2994 case MGSL_IOCSPARAMS:
2995 return mgsl_set_params(info, argp);
2996 case MGSL_IOCGTXIDLE:
2997 return mgsl_get_txidle(info, argp);
2998 case MGSL_IOCSTXIDLE:
2999 return mgsl_set_txidle(info,(int)arg);
3000 case MGSL_IOCTXENABLE:
3001 return mgsl_txenable(info,(int)arg);
3002 case MGSL_IOCRXENABLE:
3003 return mgsl_rxenable(info,(int)arg);
3004 case MGSL_IOCTXABORT:
3005 return mgsl_txabort(info);
3006 case MGSL_IOCGSTATS:
3007 return mgsl_get_stats(info, argp);
3008 case MGSL_IOCWAITEVENT:
3009 return mgsl_wait_event(info, argp);
3010 case MGSL_IOCLOOPTXDONE:
3011 return mgsl_loopmode_send_done(info);
3012 /* Wait for modem input (DCD,RI,DSR,CTS) change
3013 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
3014 */
3015 case TIOCMIWAIT:
3016 return modem_input_wait(info,(int)arg);
3017
3018 default:
3019 return -ENOIOCTLCMD;
3020 }
3021 return 0;
3022}
3023
3024/* mgsl_set_termios()
3025 *
3026 * Set new termios settings
3027 *
3028 * Arguments:
3029 *
3030 * tty pointer to tty structure
3031 * termios pointer to buffer to hold returned old termios
3032 *
3033 * Return Value: None
3034 */
3035static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3036{
3037 struct mgsl_struct *info = tty->driver_data;
3038 unsigned long flags;
3039
3040 if (debug_level >= DEBUG_LEVEL_INFO)
3041 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3042 tty->driver->name );
3043
3044 mgsl_change_params(info);
3045
3046 /* Handle transition to B0 status */
3047 if (old_termios->c_cflag & CBAUD &&
3048 !(tty->termios->c_cflag & CBAUD)) {
3049 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3050 spin_lock_irqsave(&info->irq_spinlock,flags);
3051 usc_set_serial_signals(info);
3052 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3053 }
3054
3055 /* Handle transition away from B0 status */
3056 if (!(old_termios->c_cflag & CBAUD) &&
3057 tty->termios->c_cflag & CBAUD) {
3058 info->serial_signals |= SerialSignal_DTR;
3059 if (!(tty->termios->c_cflag & CRTSCTS) ||
3060 !test_bit(TTY_THROTTLED, &tty->flags)) {
3061 info->serial_signals |= SerialSignal_RTS;
3062 }
3063 spin_lock_irqsave(&info->irq_spinlock,flags);
3064 usc_set_serial_signals(info);
3065 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3066 }
3067
3068 /* Handle turning off CRTSCTS */
3069 if (old_termios->c_cflag & CRTSCTS &&
3070 !(tty->termios->c_cflag & CRTSCTS)) {
3071 tty->hw_stopped = 0;
3072 mgsl_start(tty);
3073 }
3074
3075} /* end of mgsl_set_termios() */
3076
3077/* mgsl_close()
3078 *
3079 * Called when port is closed. Wait for remaining data to be
3080 * sent. Disable port and free resources.
3081 *
3082 * Arguments:
3083 *
3084 * tty pointer to open tty structure
3085 * filp pointer to open file object
3086 *
3087 * Return Value: None
3088 */
3089static void mgsl_close(struct tty_struct *tty, struct file * filp)
3090{
3091 struct mgsl_struct * info = tty->driver_data;
3092
3093 if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
3094 return;
3095
3096 if (debug_level >= DEBUG_LEVEL_INFO)
3097 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
3098 __FILE__,__LINE__, info->device_name, info->port.count);
3099
3100 if (tty_port_close_start(&info->port, tty, filp) == 0)
3101 goto cleanup;
3102
3103 mutex_lock(&info->port.mutex);
3104 if (info->port.flags & ASYNC_INITIALIZED)
3105 mgsl_wait_until_sent(tty, info->timeout);
3106 mgsl_flush_buffer(tty);
3107 tty_ldisc_flush(tty);
3108 shutdown(info);
3109 mutex_unlock(&info->port.mutex);
3110
3111 tty_port_close_end(&info->port, tty);
3112 info->port.tty = NULL;
3113cleanup:
3114 if (debug_level >= DEBUG_LEVEL_INFO)
3115 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
3116 tty->driver->name, info->port.count);
3117
3118} /* end of mgsl_close() */
3119
3120/* mgsl_wait_until_sent()
3121 *
3122 * Wait until the transmitter is empty.
3123 *
3124 * Arguments:
3125 *
3126 * tty pointer to tty info structure
3127 * timeout time to wait for send completion
3128 *
3129 * Return Value: None
3130 */
3131static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
3132{
3133 struct mgsl_struct * info = tty->driver_data;
3134 unsigned long orig_jiffies, char_time;
3135
3136 if (!info )
3137 return;
3138
3139 if (debug_level >= DEBUG_LEVEL_INFO)
3140 printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
3141 __FILE__,__LINE__, info->device_name );
3142
3143 if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
3144 return;
3145
3146 if (!(info->port.flags & ASYNC_INITIALIZED))
3147 goto exit;
3148
3149 orig_jiffies = jiffies;
3150
3151 /* Set check interval to 1/5 of estimated time to
3152 * send a character, and make it at least 1. The check
3153 * interval should also be less than the timeout.
3154 * Note: use tight timings here to satisfy the NIST-PCTS.
3155 */
3156
3157 if ( info->params.data_rate ) {
3158 char_time = info->timeout/(32 * 5);
3159 if (!char_time)
3160 char_time++;
3161 } else
3162 char_time = 1;
3163
3164 if (timeout)
3165 char_time = min_t(unsigned long, char_time, timeout);
3166
3167 if ( info->params.mode == MGSL_MODE_HDLC ||
3168 info->params.mode == MGSL_MODE_RAW ) {
3169 while (info->tx_active) {
3170 msleep_interruptible(jiffies_to_msecs(char_time));
3171 if (signal_pending(current))
3172 break;
3173 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3174 break;
3175 }
3176 } else {
3177 while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
3178 info->tx_enabled) {
3179 msleep_interruptible(jiffies_to_msecs(char_time));
3180 if (signal_pending(current))
3181 break;
3182 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3183 break;
3184 }
3185 }
3186
3187exit:
3188 if (debug_level >= DEBUG_LEVEL_INFO)
3189 printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
3190 __FILE__,__LINE__, info->device_name );
3191
3192} /* end of mgsl_wait_until_sent() */
3193
3194/* mgsl_hangup()
3195 *
3196 * Called by tty_hangup() when a hangup is signaled.
3197 * This is the same as to closing all open files for the port.
3198 *
3199 * Arguments: tty pointer to associated tty object
3200 * Return Value: None
3201 */
3202static void mgsl_hangup(struct tty_struct *tty)
3203{
3204 struct mgsl_struct * info = tty->driver_data;
3205
3206 if (debug_level >= DEBUG_LEVEL_INFO)
3207 printk("%s(%d):mgsl_hangup(%s)\n",
3208 __FILE__,__LINE__, info->device_name );
3209
3210 if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
3211 return;
3212
3213 mgsl_flush_buffer(tty);
3214 shutdown(info);
3215
3216 info->port.count = 0;
3217 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
3218 info->port.tty = NULL;
3219
3220 wake_up_interruptible(&info->port.open_wait);
3221
3222} /* end of mgsl_hangup() */
3223
3224/*
3225 * carrier_raised()
3226 *
3227 * Return true if carrier is raised
3228 */
3229
3230static int carrier_raised(struct tty_port *port)
3231{
3232 unsigned long flags;
3233 struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
3234
3235 spin_lock_irqsave(&info->irq_spinlock, flags);
3236 usc_get_serial_signals(info);
3237 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3238 return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3239}
3240
3241static void dtr_rts(struct tty_port *port, int on)
3242{
3243 struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
3244 unsigned long flags;
3245
3246 spin_lock_irqsave(&info->irq_spinlock,flags);
3247 if (on)
3248 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3249 else
3250 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3251 usc_set_serial_signals(info);
3252 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3253}
3254
3255
3256/* block_til_ready()
3257 *
3258 * Block the current process until the specified port
3259 * is ready to be opened.
3260 *
3261 * Arguments:
3262 *
3263 * tty pointer to tty info structure
3264 * filp pointer to open file object
3265 * info pointer to device instance data
3266 *
3267 * Return Value: 0 if success, otherwise error code
3268 */
3269static int block_til_ready(struct tty_struct *tty, struct file * filp,
3270 struct mgsl_struct *info)
3271{
3272 DECLARE_WAITQUEUE(wait, current);
3273 int retval;
3274 bool do_clocal = false;
3275 bool extra_count = false;
3276 unsigned long flags;
3277 int dcd;
3278 struct tty_port *port = &info->port;
3279
3280 if (debug_level >= DEBUG_LEVEL_INFO)
3281 printk("%s(%d):block_til_ready on %s\n",
3282 __FILE__,__LINE__, tty->driver->name );
3283
3284 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3285 /* nonblock mode is set or port is not enabled */
3286 port->flags |= ASYNC_NORMAL_ACTIVE;
3287 return 0;
3288 }
3289
3290 if (tty->termios->c_cflag & CLOCAL)
3291 do_clocal = true;
3292
3293 /* Wait for carrier detect and the line to become
3294 * free (i.e., not in use by the callout). While we are in
3295 * this loop, port->count is dropped by one, so that
3296 * mgsl_close() knows when to free things. We restore it upon
3297 * exit, either normal or abnormal.
3298 */
3299
3300 retval = 0;
3301 add_wait_queue(&port->open_wait, &wait);
3302
3303 if (debug_level >= DEBUG_LEVEL_INFO)
3304 printk("%s(%d):block_til_ready before block on %s count=%d\n",
3305 __FILE__,__LINE__, tty->driver->name, port->count );
3306
3307 spin_lock_irqsave(&info->irq_spinlock, flags);
3308 if (!tty_hung_up_p(filp)) {
3309 extra_count = true;
3310 port->count--;
3311 }
3312 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3313 port->blocked_open++;
3314
3315 while (1) {
3316 if (tty->termios->c_cflag & CBAUD)
3317 tty_port_raise_dtr_rts(port);
3318
3319 set_current_state(TASK_INTERRUPTIBLE);
3320
3321 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3322 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3323 -EAGAIN : -ERESTARTSYS;
3324 break;
3325 }
3326
3327 dcd = tty_port_carrier_raised(&info->port);
3328
3329 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || dcd))
3330 break;
3331
3332 if (signal_pending(current)) {
3333 retval = -ERESTARTSYS;
3334 break;
3335 }
3336
3337 if (debug_level >= DEBUG_LEVEL_INFO)
3338 printk("%s(%d):block_til_ready blocking on %s count=%d\n",
3339 __FILE__,__LINE__, tty->driver->name, port->count );
3340
3341 tty_unlock();
3342 schedule();
3343 tty_lock();
3344 }
3345
3346 set_current_state(TASK_RUNNING);
3347 remove_wait_queue(&port->open_wait, &wait);
3348
3349 /* FIXME: Racy on hangup during close wait */
3350 if (extra_count)
3351 port->count++;
3352 port->blocked_open--;
3353
3354 if (debug_level >= DEBUG_LEVEL_INFO)
3355 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
3356 __FILE__,__LINE__, tty->driver->name, port->count );
3357
3358 if (!retval)
3359 port->flags |= ASYNC_NORMAL_ACTIVE;
3360
3361 return retval;
3362
3363} /* end of block_til_ready() */
3364
3365/* mgsl_open()
3366 *
3367 * Called when a port is opened. Init and enable port.
3368 * Perform serial-specific initialization for the tty structure.
3369 *
3370 * Arguments: tty pointer to tty info structure
3371 * filp associated file pointer
3372 *
3373 * Return Value: 0 if success, otherwise error code
3374 */
3375static int mgsl_open(struct tty_struct *tty, struct file * filp)
3376{
3377 struct mgsl_struct *info;
3378 int retval, line;
3379 unsigned long flags;
3380
3381 /* verify range of specified line number */
3382 line = tty->index;
3383 if (line >= mgsl_device_count) {
3384 printk("%s(%d):mgsl_open with invalid line #%d.\n",
3385 __FILE__,__LINE__,line);
3386 return -ENODEV;
3387 }
3388
3389 /* find the info structure for the specified line */
3390 info = mgsl_device_list;
3391 while(info && info->line != line)
3392 info = info->next_device;
3393 if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
3394 return -ENODEV;
3395
3396 tty->driver_data = info;
3397 info->port.tty = tty;
3398
3399 if (debug_level >= DEBUG_LEVEL_INFO)
3400 printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
3401 __FILE__,__LINE__,tty->driver->name, info->port.count);
3402
3403 /* If port is closing, signal caller to try again */
3404 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
3405 if (info->port.flags & ASYNC_CLOSING)
3406 interruptible_sleep_on(&info->port.close_wait);
3407 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
3408 -EAGAIN : -ERESTARTSYS);
3409 goto cleanup;
3410 }
3411
3412 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3413
3414 spin_lock_irqsave(&info->netlock, flags);
3415 if (info->netcount) {
3416 retval = -EBUSY;
3417 spin_unlock_irqrestore(&info->netlock, flags);
3418 goto cleanup;
3419 }
3420 info->port.count++;
3421 spin_unlock_irqrestore(&info->netlock, flags);
3422
3423 if (info->port.count == 1) {
3424 /* 1st open on this device, init hardware */
3425 retval = startup(info);
3426 if (retval < 0)
3427 goto cleanup;
3428 }
3429
3430 retval = block_til_ready(tty, filp, info);
3431 if (retval) {
3432 if (debug_level >= DEBUG_LEVEL_INFO)
3433 printk("%s(%d):block_til_ready(%s) returned %d\n",
3434 __FILE__,__LINE__, info->device_name, retval);
3435 goto cleanup;
3436 }
3437
3438 if (debug_level >= DEBUG_LEVEL_INFO)
3439 printk("%s(%d):mgsl_open(%s) success\n",
3440 __FILE__,__LINE__, info->device_name);
3441 retval = 0;
3442
3443cleanup:
3444 if (retval) {
3445 if (tty->count == 1)
3446 info->port.tty = NULL; /* tty layer will release tty struct */
3447 if(info->port.count)
3448 info->port.count--;
3449 }
3450
3451 return retval;
3452
3453} /* end of mgsl_open() */
3454
3455/*
3456 * /proc fs routines....
3457 */
3458
3459static inline void line_info(struct seq_file *m, struct mgsl_struct *info)
3460{
3461 char stat_buf[30];
3462 unsigned long flags;
3463
3464 if (info->bus_type == MGSL_BUS_TYPE_PCI) {
3465 seq_printf(m, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
3466 info->device_name, info->io_base, info->irq_level,
3467 info->phys_memory_base, info->phys_lcr_base);
3468 } else {
3469 seq_printf(m, "%s:(E)ISA io:%04X irq:%d dma:%d",
3470 info->device_name, info->io_base,
3471 info->irq_level, info->dma_level);
3472 }
3473
3474 /* output current serial signal states */
3475 spin_lock_irqsave(&info->irq_spinlock,flags);
3476 usc_get_serial_signals(info);
3477 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3478
3479 stat_buf[0] = 0;
3480 stat_buf[1] = 0;
3481 if (info->serial_signals & SerialSignal_RTS)
3482 strcat(stat_buf, "|RTS");
3483 if (info->serial_signals & SerialSignal_CTS)
3484 strcat(stat_buf, "|CTS");
3485 if (info->serial_signals & SerialSignal_DTR)
3486 strcat(stat_buf, "|DTR");
3487 if (info->serial_signals & SerialSignal_DSR)
3488 strcat(stat_buf, "|DSR");
3489 if (info->serial_signals & SerialSignal_DCD)
3490 strcat(stat_buf, "|CD");
3491 if (info->serial_signals & SerialSignal_RI)
3492 strcat(stat_buf, "|RI");
3493
3494 if (info->params.mode == MGSL_MODE_HDLC ||
3495 info->params.mode == MGSL_MODE_RAW ) {
3496 seq_printf(m, " HDLC txok:%d rxok:%d",
3497 info->icount.txok, info->icount.rxok);
3498 if (info->icount.txunder)
3499 seq_printf(m, " txunder:%d", info->icount.txunder);
3500 if (info->icount.txabort)
3501 seq_printf(m, " txabort:%d", info->icount.txabort);
3502 if (info->icount.rxshort)
3503 seq_printf(m, " rxshort:%d", info->icount.rxshort);
3504 if (info->icount.rxlong)
3505 seq_printf(m, " rxlong:%d", info->icount.rxlong);
3506 if (info->icount.rxover)
3507 seq_printf(m, " rxover:%d", info->icount.rxover);
3508 if (info->icount.rxcrc)
3509 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
3510 } else {
3511 seq_printf(m, " ASYNC tx:%d rx:%d",
3512 info->icount.tx, info->icount.rx);
3513 if (info->icount.frame)
3514 seq_printf(m, " fe:%d", info->icount.frame);
3515 if (info->icount.parity)
3516 seq_printf(m, " pe:%d", info->icount.parity);
3517 if (info->icount.brk)
3518 seq_printf(m, " brk:%d", info->icount.brk);
3519 if (info->icount.overrun)
3520 seq_printf(m, " oe:%d", info->icount.overrun);
3521 }
3522
3523 /* Append serial signal status to end */
3524 seq_printf(m, " %s\n", stat_buf+1);
3525
3526 seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
3527 info->tx_active,info->bh_requested,info->bh_running,
3528 info->pending_bh);
3529
3530 spin_lock_irqsave(&info->irq_spinlock,flags);
3531 {
3532 u16 Tcsr = usc_InReg( info, TCSR );
3533 u16 Tdmr = usc_InDmaReg( info, TDMR );
3534 u16 Ticr = usc_InReg( info, TICR );
3535 u16 Rscr = usc_InReg( info, RCSR );
3536 u16 Rdmr = usc_InDmaReg( info, RDMR );
3537 u16 Ricr = usc_InReg( info, RICR );
3538 u16 Icr = usc_InReg( info, ICR );
3539 u16 Dccr = usc_InReg( info, DCCR );
3540 u16 Tmr = usc_InReg( info, TMR );
3541 u16 Tccr = usc_InReg( info, TCCR );
3542 u16 Ccar = inw( info->io_base + CCAR );
3543 seq_printf(m, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
3544 "ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
3545 Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
3546 }
3547 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3548}
3549
3550/* Called to print information about devices */
3551static int mgsl_proc_show(struct seq_file *m, void *v)
3552{
3553 struct mgsl_struct *info;
3554
3555 seq_printf(m, "synclink driver:%s\n", driver_version);
3556
3557 info = mgsl_device_list;
3558 while( info ) {
3559 line_info(m, info);
3560 info = info->next_device;
3561 }
3562 return 0;
3563}
3564
3565static int mgsl_proc_open(struct inode *inode, struct file *file)
3566{
3567 return single_open(file, mgsl_proc_show, NULL);
3568}
3569
3570static const struct file_operations mgsl_proc_fops = {
3571 .owner = THIS_MODULE,
3572 .open = mgsl_proc_open,
3573 .read = seq_read,
3574 .llseek = seq_lseek,
3575 .release = single_release,
3576};
3577
3578/* mgsl_allocate_dma_buffers()
3579 *
3580 * Allocate and format DMA buffers (ISA adapter)
3581 * or format shared memory buffers (PCI adapter).
3582 *
3583 * Arguments: info pointer to device instance data
3584 * Return Value: 0 if success, otherwise error
3585 */
3586static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
3587{
3588 unsigned short BuffersPerFrame;
3589
3590 info->last_mem_alloc = 0;
3591
3592 /* Calculate the number of DMA buffers necessary to hold the */
3593 /* largest allowable frame size. Note: If the max frame size is */
3594 /* not an even multiple of the DMA buffer size then we need to */
3595 /* round the buffer count per frame up one. */
3596
3597 BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
3598 if ( info->max_frame_size % DMABUFFERSIZE )
3599 BuffersPerFrame++;
3600
3601 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3602 /*
3603 * The PCI adapter has 256KBytes of shared memory to use.
3604 * This is 64 PAGE_SIZE buffers.
3605 *
3606 * The first page is used for padding at this time so the
3607 * buffer list does not begin at offset 0 of the PCI
3608 * adapter's shared memory.
3609 *
3610 * The 2nd page is used for the buffer list. A 4K buffer
3611 * list can hold 128 DMA_BUFFER structures at 32 bytes
3612 * each.
3613 *
3614 * This leaves 62 4K pages.
3615 *
3616 * The next N pages are used for transmit frame(s). We
3617 * reserve enough 4K page blocks to hold the required
3618 * number of transmit dma buffers (num_tx_dma_buffers),
3619 * each of MaxFrameSize size.
3620 *
3621 * Of the remaining pages (62-N), determine how many can
3622 * be used to receive full MaxFrameSize inbound frames
3623 */
3624 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3625 info->rx_buffer_count = 62 - info->tx_buffer_count;
3626 } else {
3627 /* Calculate the number of PAGE_SIZE buffers needed for */
3628 /* receive and transmit DMA buffers. */
3629
3630
3631 /* Calculate the number of DMA buffers necessary to */
3632 /* hold 7 max size receive frames and one max size transmit frame. */
3633 /* The receive buffer count is bumped by one so we avoid an */
3634 /* End of List condition if all receive buffers are used when */
3635 /* using linked list DMA buffers. */
3636
3637 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3638 info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
3639
3640 /*
3641 * limit total TxBuffers & RxBuffers to 62 4K total
3642 * (ala PCI Allocation)
3643 */
3644
3645 if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
3646 info->rx_buffer_count = 62 - info->tx_buffer_count;
3647
3648 }
3649
3650 if ( debug_level >= DEBUG_LEVEL_INFO )
3651 printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
3652 __FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
3653
3654 if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
3655 mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 ||
3656 mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 ||
3657 mgsl_alloc_intermediate_rxbuffer_memory(info) < 0 ||
3658 mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
3659 printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
3660 return -ENOMEM;
3661 }
3662
3663 mgsl_reset_rx_dma_buffers( info );
3664 mgsl_reset_tx_dma_buffers( info );
3665
3666 return 0;
3667
3668} /* end of mgsl_allocate_dma_buffers() */
3669
3670/*
3671 * mgsl_alloc_buffer_list_memory()
3672 *
3673 * Allocate a common DMA buffer for use as the
3674 * receive and transmit buffer lists.
3675 *
3676 * A buffer list is a set of buffer entries where each entry contains
3677 * a pointer to an actual buffer and a pointer to the next buffer entry
3678 * (plus some other info about the buffer).
3679 *
3680 * The buffer entries for a list are built to form a circular list so
3681 * that when the entire list has been traversed you start back at the
3682 * beginning.
3683 *
3684 * This function allocates memory for just the buffer entries.
3685 * The links (pointer to next entry) are filled in with the physical
3686 * address of the next entry so the adapter can navigate the list
3687 * using bus master DMA. The pointers to the actual buffers are filled
3688 * out later when the actual buffers are allocated.
3689 *
3690 * Arguments: info pointer to device instance data
3691 * Return Value: 0 if success, otherwise error
3692 */
3693static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
3694{
3695 unsigned int i;
3696
3697 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3698 /* PCI adapter uses shared memory. */
3699 info->buffer_list = info->memory_base + info->last_mem_alloc;
3700 info->buffer_list_phys = info->last_mem_alloc;
3701 info->last_mem_alloc += BUFFERLISTSIZE;
3702 } else {
3703 /* ISA adapter uses system memory. */
3704 /* The buffer lists are allocated as a common buffer that both */
3705 /* the processor and adapter can access. This allows the driver to */
3706 /* inspect portions of the buffer while other portions are being */
3707 /* updated by the adapter using Bus Master DMA. */
3708
3709 info->buffer_list = dma_alloc_coherent(NULL, BUFFERLISTSIZE, &info->buffer_list_dma_addr, GFP_KERNEL);
3710 if (info->buffer_list == NULL)
3711 return -ENOMEM;
3712 info->buffer_list_phys = (u32)(info->buffer_list_dma_addr);
3713 }
3714
3715 /* We got the memory for the buffer entry lists. */
3716 /* Initialize the memory block to all zeros. */
3717 memset( info->buffer_list, 0, BUFFERLISTSIZE );
3718
3719 /* Save virtual address pointers to the receive and */
3720 /* transmit buffer lists. (Receive 1st). These pointers will */
3721 /* be used by the processor to access the lists. */
3722 info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3723 info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3724 info->tx_buffer_list += info->rx_buffer_count;
3725
3726 /*
3727 * Build the links for the buffer entry lists such that
3728 * two circular lists are built. (Transmit and Receive).
3729 *
3730 * Note: the links are physical addresses
3731 * which are read by the adapter to determine the next
3732 * buffer entry to use.
3733 */
3734
3735 for ( i = 0; i < info->rx_buffer_count; i++ ) {
3736 /* calculate and store physical address of this buffer entry */
3737 info->rx_buffer_list[i].phys_entry =
3738 info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
3739
3740 /* calculate and store physical address of */
3741 /* next entry in cirular list of entries */
3742
3743 info->rx_buffer_list[i].link = info->buffer_list_phys;
3744
3745 if ( i < info->rx_buffer_count - 1 )
3746 info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3747 }
3748
3749 for ( i = 0; i < info->tx_buffer_count; i++ ) {
3750 /* calculate and store physical address of this buffer entry */
3751 info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
3752 ((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
3753
3754 /* calculate and store physical address of */
3755 /* next entry in cirular list of entries */
3756
3757 info->tx_buffer_list[i].link = info->buffer_list_phys +
3758 info->rx_buffer_count * sizeof(DMABUFFERENTRY);
3759
3760 if ( i < info->tx_buffer_count - 1 )
3761 info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3762 }
3763
3764 return 0;
3765
3766} /* end of mgsl_alloc_buffer_list_memory() */
3767
3768/* Free DMA buffers allocated for use as the
3769 * receive and transmit buffer lists.
3770 * Warning:
3771 *
3772 * The data transfer buffers associated with the buffer list
3773 * MUST be freed before freeing the buffer list itself because
3774 * the buffer list contains the information necessary to free
3775 * the individual buffers!
3776 */
3777static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
3778{
3779 if (info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI)
3780 dma_free_coherent(NULL, BUFFERLISTSIZE, info->buffer_list, info->buffer_list_dma_addr);
3781
3782 info->buffer_list = NULL;
3783 info->rx_buffer_list = NULL;
3784 info->tx_buffer_list = NULL;
3785
3786} /* end of mgsl_free_buffer_list_memory() */
3787
3788/*
3789 * mgsl_alloc_frame_memory()
3790 *
3791 * Allocate the frame DMA buffers used by the specified buffer list.
3792 * Each DMA buffer will be one memory page in size. This is necessary
3793 * because memory can fragment enough that it may be impossible
3794 * contiguous pages.
3795 *
3796 * Arguments:
3797 *
3798 * info pointer to device instance data
3799 * BufferList pointer to list of buffer entries
3800 * Buffercount count of buffer entries in buffer list
3801 *
3802 * Return Value: 0 if success, otherwise -ENOMEM
3803 */
3804static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
3805{
3806 int i;
3807 u32 phys_addr;
3808
3809 /* Allocate page sized buffers for the receive buffer list */
3810
3811 for ( i = 0; i < Buffercount; i++ ) {
3812 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3813 /* PCI adapter uses shared memory buffers. */
3814 BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
3815 phys_addr = info->last_mem_alloc;
3816 info->last_mem_alloc += DMABUFFERSIZE;
3817 } else {
3818 /* ISA adapter uses system memory. */
3819 BufferList[i].virt_addr = dma_alloc_coherent(NULL, DMABUFFERSIZE, &BufferList[i].dma_addr, GFP_KERNEL);
3820 if (BufferList[i].virt_addr == NULL)
3821 return -ENOMEM;
3822 phys_addr = (u32)(BufferList[i].dma_addr);
3823 }
3824 BufferList[i].phys_addr = phys_addr;
3825 }
3826
3827 return 0;
3828
3829} /* end of mgsl_alloc_frame_memory() */
3830
3831/*
3832 * mgsl_free_frame_memory()
3833 *
3834 * Free the buffers associated with
3835 * each buffer entry of a buffer list.
3836 *
3837 * Arguments:
3838 *
3839 * info pointer to device instance data
3840 * BufferList pointer to list of buffer entries
3841 * Buffercount count of buffer entries in buffer list
3842 *
3843 * Return Value: None
3844 */
3845static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
3846{
3847 int i;
3848
3849 if ( BufferList ) {
3850 for ( i = 0 ; i < Buffercount ; i++ ) {
3851 if ( BufferList[i].virt_addr ) {
3852 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
3853 dma_free_coherent(NULL, DMABUFFERSIZE, BufferList[i].virt_addr, BufferList[i].dma_addr);
3854 BufferList[i].virt_addr = NULL;
3855 }
3856 }
3857 }
3858
3859} /* end of mgsl_free_frame_memory() */
3860
3861/* mgsl_free_dma_buffers()
3862 *
3863 * Free DMA buffers
3864 *
3865 * Arguments: info pointer to device instance data
3866 * Return Value: None
3867 */
3868static void mgsl_free_dma_buffers( struct mgsl_struct *info )
3869{
3870 mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
3871 mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
3872 mgsl_free_buffer_list_memory( info );
3873
3874} /* end of mgsl_free_dma_buffers() */
3875
3876
3877/*
3878 * mgsl_alloc_intermediate_rxbuffer_memory()
3879 *
3880 * Allocate a buffer large enough to hold max_frame_size. This buffer
3881 * is used to pass an assembled frame to the line discipline.
3882 *
3883 * Arguments:
3884 *
3885 * info pointer to device instance data
3886 *
3887 * Return Value: 0 if success, otherwise -ENOMEM
3888 */
3889static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3890{
3891 info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
3892 if ( info->intermediate_rxbuffer == NULL )
3893 return -ENOMEM;
3894
3895 return 0;
3896
3897} /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
3898
3899/*
3900 * mgsl_free_intermediate_rxbuffer_memory()
3901 *
3902 *
3903 * Arguments:
3904 *
3905 * info pointer to device instance data
3906 *
3907 * Return Value: None
3908 */
3909static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3910{
3911 kfree(info->intermediate_rxbuffer);
3912 info->intermediate_rxbuffer = NULL;
3913
3914} /* end of mgsl_free_intermediate_rxbuffer_memory() */
3915
3916/*
3917 * mgsl_alloc_intermediate_txbuffer_memory()
3918 *
3919 * Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
3920 * This buffer is used to load transmit frames into the adapter's dma transfer
3921 * buffers when there is sufficient space.
3922 *
3923 * Arguments:
3924 *
3925 * info pointer to device instance data
3926 *
3927 * Return Value: 0 if success, otherwise -ENOMEM
3928 */
3929static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
3930{
3931 int i;
3932
3933 if ( debug_level >= DEBUG_LEVEL_INFO )
3934 printk("%s %s(%d) allocating %d tx holding buffers\n",
3935 info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
3936
3937 memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
3938
3939 for ( i=0; i<info->num_tx_holding_buffers; ++i) {
3940 info->tx_holding_buffers[i].buffer =
3941 kmalloc(info->max_frame_size, GFP_KERNEL);
3942 if (info->tx_holding_buffers[i].buffer == NULL) {
3943 for (--i; i >= 0; i--) {
3944 kfree(info->tx_holding_buffers[i].buffer);
3945 info->tx_holding_buffers[i].buffer = NULL;
3946 }
3947 return -ENOMEM;
3948 }
3949 }
3950
3951 return 0;
3952
3953} /* end of mgsl_alloc_intermediate_txbuffer_memory() */
3954
3955/*
3956 * mgsl_free_intermediate_txbuffer_memory()
3957 *
3958 *
3959 * Arguments:
3960 *
3961 * info pointer to device instance data
3962 *
3963 * Return Value: None
3964 */
3965static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
3966{
3967 int i;
3968
3969 for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
3970 kfree(info->tx_holding_buffers[i].buffer);
3971 info->tx_holding_buffers[i].buffer = NULL;
3972 }
3973
3974 info->get_tx_holding_index = 0;
3975 info->put_tx_holding_index = 0;
3976 info->tx_holding_count = 0;
3977
3978} /* end of mgsl_free_intermediate_txbuffer_memory() */
3979
3980
3981/*
3982 * load_next_tx_holding_buffer()
3983 *
3984 * attempts to load the next buffered tx request into the
3985 * tx dma buffers
3986 *
3987 * Arguments:
3988 *
3989 * info pointer to device instance data
3990 *
3991 * Return Value: true if next buffered tx request loaded
3992 * into adapter's tx dma buffer,
3993 * false otherwise
3994 */
3995static bool load_next_tx_holding_buffer(struct mgsl_struct *info)
3996{
3997 bool ret = false;
3998
3999 if ( info->tx_holding_count ) {
4000 /* determine if we have enough tx dma buffers
4001 * to accommodate the next tx frame
4002 */
4003 struct tx_holding_buffer *ptx =
4004 &info->tx_holding_buffers[info->get_tx_holding_index];
4005 int num_free = num_free_tx_dma_buffers(info);
4006 int num_needed = ptx->buffer_size / DMABUFFERSIZE;
4007 if ( ptx->buffer_size % DMABUFFERSIZE )
4008 ++num_needed;
4009
4010 if (num_needed <= num_free) {
4011 info->xmit_cnt = ptx->buffer_size;
4012 mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
4013
4014 --info->tx_holding_count;
4015 if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
4016 info->get_tx_holding_index=0;
4017
4018 /* restart transmit timer */
4019 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
4020
4021 ret = true;
4022 }
4023 }
4024
4025 return ret;
4026}
4027
4028/*
4029 * save_tx_buffer_request()
4030 *
4031 * attempt to store transmit frame request for later transmission
4032 *
4033 * Arguments:
4034 *
4035 * info pointer to device instance data
4036 * Buffer pointer to buffer containing frame to load
4037 * BufferSize size in bytes of frame in Buffer
4038 *
4039 * Return Value: 1 if able to store, 0 otherwise
4040 */
4041static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
4042{
4043 struct tx_holding_buffer *ptx;
4044
4045 if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
4046 return 0; /* all buffers in use */
4047 }
4048
4049 ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
4050 ptx->buffer_size = BufferSize;
4051 memcpy( ptx->buffer, Buffer, BufferSize);
4052
4053 ++info->tx_holding_count;
4054 if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
4055 info->put_tx_holding_index=0;
4056
4057 return 1;
4058}
4059
4060static int mgsl_claim_resources(struct mgsl_struct *info)
4061{
4062 if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
4063 printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
4064 __FILE__,__LINE__,info->device_name, info->io_base);
4065 return -ENODEV;
4066 }
4067 info->io_addr_requested = true;
4068
4069 if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
4070 info->device_name, info ) < 0 ) {
4071 printk( "%s(%d):Can't request interrupt on device %s IRQ=%d\n",
4072 __FILE__,__LINE__,info->device_name, info->irq_level );
4073 goto errout;
4074 }
4075 info->irq_requested = true;
4076
4077 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4078 if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
4079 printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
4080 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
4081 goto errout;
4082 }
4083 info->shared_mem_requested = true;
4084 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
4085 printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
4086 __FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
4087 goto errout;
4088 }
4089 info->lcr_mem_requested = true;
4090
4091 info->memory_base = ioremap_nocache(info->phys_memory_base,
4092 0x40000);
4093 if (!info->memory_base) {
4094 printk( "%s(%d):Can't map shared memory on device %s MemAddr=%08X\n",
4095 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4096 goto errout;
4097 }
4098
4099 if ( !mgsl_memory_test(info) ) {
4100 printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
4101 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4102 goto errout;
4103 }
4104
4105 info->lcr_base = ioremap_nocache(info->phys_lcr_base,
4106 PAGE_SIZE);
4107 if (!info->lcr_base) {
4108 printk( "%s(%d):Can't map LCR memory on device %s MemAddr=%08X\n",
4109 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
4110 goto errout;
4111 }
4112 info->lcr_base += info->lcr_offset;
4113
4114 } else {
4115 /* claim DMA channel */
4116
4117 if (request_dma(info->dma_level,info->device_name) < 0){
4118 printk( "%s(%d):Can't request DMA channel on device %s DMA=%d\n",
4119 __FILE__,__LINE__,info->device_name, info->dma_level );
4120 mgsl_release_resources( info );
4121 return -ENODEV;
4122 }
4123 info->dma_requested = true;
4124
4125 /* ISA adapter uses bus master DMA */
4126 set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
4127 enable_dma(info->dma_level);
4128 }
4129
4130 if ( mgsl_allocate_dma_buffers(info) < 0 ) {
4131 printk( "%s(%d):Can't allocate DMA buffers on device %s DMA=%d\n",
4132 __FILE__,__LINE__,info->device_name, info->dma_level );
4133 goto errout;
4134 }
4135
4136 return 0;
4137errout:
4138 mgsl_release_resources(info);
4139 return -ENODEV;
4140
4141} /* end of mgsl_claim_resources() */
4142
4143static void mgsl_release_resources(struct mgsl_struct *info)
4144{
4145 if ( debug_level >= DEBUG_LEVEL_INFO )
4146 printk( "%s(%d):mgsl_release_resources(%s) entry\n",
4147 __FILE__,__LINE__,info->device_name );
4148
4149 if ( info->irq_requested ) {
4150 free_irq(info->irq_level, info);
4151 info->irq_requested = false;
4152 }
4153 if ( info->dma_requested ) {
4154 disable_dma(info->dma_level);
4155 free_dma(info->dma_level);
4156 info->dma_requested = false;
4157 }
4158 mgsl_free_dma_buffers(info);
4159 mgsl_free_intermediate_rxbuffer_memory(info);
4160 mgsl_free_intermediate_txbuffer_memory(info);
4161
4162 if ( info->io_addr_requested ) {
4163 release_region(info->io_base,info->io_addr_size);
4164 info->io_addr_requested = false;
4165 }
4166 if ( info->shared_mem_requested ) {
4167 release_mem_region(info->phys_memory_base,0x40000);
4168 info->shared_mem_requested = false;
4169 }
4170 if ( info->lcr_mem_requested ) {
4171 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
4172 info->lcr_mem_requested = false;
4173 }
4174 if (info->memory_base){
4175 iounmap(info->memory_base);
4176 info->memory_base = NULL;
4177 }
4178 if (info->lcr_base){
4179 iounmap(info->lcr_base - info->lcr_offset);
4180 info->lcr_base = NULL;
4181 }
4182
4183 if ( debug_level >= DEBUG_LEVEL_INFO )
4184 printk( "%s(%d):mgsl_release_resources(%s) exit\n",
4185 __FILE__,__LINE__,info->device_name );
4186
4187} /* end of mgsl_release_resources() */
4188
4189/* mgsl_add_device()
4190 *
4191 * Add the specified device instance data structure to the
4192 * global linked list of devices and increment the device count.
4193 *
4194 * Arguments: info pointer to device instance data
4195 * Return Value: None
4196 */
4197static void mgsl_add_device( struct mgsl_struct *info )
4198{
4199 info->next_device = NULL;
4200 info->line = mgsl_device_count;
4201 sprintf(info->device_name,"ttySL%d",info->line);
4202
4203 if (info->line < MAX_TOTAL_DEVICES) {
4204 if (maxframe[info->line])
4205 info->max_frame_size = maxframe[info->line];
4206
4207 if (txdmabufs[info->line]) {
4208 info->num_tx_dma_buffers = txdmabufs[info->line];
4209 if (info->num_tx_dma_buffers < 1)
4210 info->num_tx_dma_buffers = 1;
4211 }
4212
4213 if (txholdbufs[info->line]) {
4214 info->num_tx_holding_buffers = txholdbufs[info->line];
4215 if (info->num_tx_holding_buffers < 1)
4216 info->num_tx_holding_buffers = 1;
4217 else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
4218 info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
4219 }
4220 }
4221
4222 mgsl_device_count++;
4223
4224 if ( !mgsl_device_list )
4225 mgsl_device_list = info;
4226 else {
4227 struct mgsl_struct *current_dev = mgsl_device_list;
4228 while( current_dev->next_device )
4229 current_dev = current_dev->next_device;
4230 current_dev->next_device = info;
4231 }
4232
4233 if ( info->max_frame_size < 4096 )
4234 info->max_frame_size = 4096;
4235 else if ( info->max_frame_size > 65535 )
4236 info->max_frame_size = 65535;
4237
4238 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4239 printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
4240 info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
4241 info->phys_memory_base, info->phys_lcr_base,
4242 info->max_frame_size );
4243 } else {
4244 printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
4245 info->device_name, info->io_base, info->irq_level, info->dma_level,
4246 info->max_frame_size );
4247 }
4248
4249#if SYNCLINK_GENERIC_HDLC
4250 hdlcdev_init(info);
4251#endif
4252
4253} /* end of mgsl_add_device() */
4254
4255static const struct tty_port_operations mgsl_port_ops = {
4256 .carrier_raised = carrier_raised,
4257 .dtr_rts = dtr_rts,
4258};
4259
4260
4261/* mgsl_allocate_device()
4262 *
4263 * Allocate and initialize a device instance structure
4264 *
4265 * Arguments: none
4266 * Return Value: pointer to mgsl_struct if success, otherwise NULL
4267 */
4268static struct mgsl_struct* mgsl_allocate_device(void)
4269{
4270 struct mgsl_struct *info;
4271
4272 info = kzalloc(sizeof(struct mgsl_struct),
4273 GFP_KERNEL);
4274
4275 if (!info) {
4276 printk("Error can't allocate device instance data\n");
4277 } else {
4278 tty_port_init(&info->port);
4279 info->port.ops = &mgsl_port_ops;
4280 info->magic = MGSL_MAGIC;
4281 INIT_WORK(&info->task, mgsl_bh_handler);
4282 info->max_frame_size = 4096;
4283 info->port.close_delay = 5*HZ/10;
4284 info->port.closing_wait = 30*HZ;
4285 init_waitqueue_head(&info->status_event_wait_q);
4286 init_waitqueue_head(&info->event_wait_q);
4287 spin_lock_init(&info->irq_spinlock);
4288 spin_lock_init(&info->netlock);
4289 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
4290 info->idle_mode = HDLC_TXIDLE_FLAGS;
4291 info->num_tx_dma_buffers = 1;
4292 info->num_tx_holding_buffers = 0;
4293 }
4294
4295 return info;
4296
4297} /* end of mgsl_allocate_device()*/
4298
4299static const struct tty_operations mgsl_ops = {
4300 .open = mgsl_open,
4301 .close = mgsl_close,
4302 .write = mgsl_write,
4303 .put_char = mgsl_put_char,
4304 .flush_chars = mgsl_flush_chars,
4305 .write_room = mgsl_write_room,
4306 .chars_in_buffer = mgsl_chars_in_buffer,
4307 .flush_buffer = mgsl_flush_buffer,
4308 .ioctl = mgsl_ioctl,
4309 .throttle = mgsl_throttle,
4310 .unthrottle = mgsl_unthrottle,
4311 .send_xchar = mgsl_send_xchar,
4312 .break_ctl = mgsl_break,
4313 .wait_until_sent = mgsl_wait_until_sent,
4314 .set_termios = mgsl_set_termios,
4315 .stop = mgsl_stop,
4316 .start = mgsl_start,
4317 .hangup = mgsl_hangup,
4318 .tiocmget = tiocmget,
4319 .tiocmset = tiocmset,
4320 .get_icount = msgl_get_icount,
4321 .proc_fops = &mgsl_proc_fops,
4322};
4323
4324/*
4325 * perform tty device initialization
4326 */
4327static int mgsl_init_tty(void)
4328{
4329 int rc;
4330
4331 serial_driver = alloc_tty_driver(128);
4332 if (!serial_driver)
4333 return -ENOMEM;
4334
4335 serial_driver->driver_name = "synclink";
4336 serial_driver->name = "ttySL";
4337 serial_driver->major = ttymajor;
4338 serial_driver->minor_start = 64;
4339 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4340 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4341 serial_driver->init_termios = tty_std_termios;
4342 serial_driver->init_termios.c_cflag =
4343 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4344 serial_driver->init_termios.c_ispeed = 9600;
4345 serial_driver->init_termios.c_ospeed = 9600;
4346 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4347 tty_set_operations(serial_driver, &mgsl_ops);
4348 if ((rc = tty_register_driver(serial_driver)) < 0) {
4349 printk("%s(%d):Couldn't register serial driver\n",
4350 __FILE__,__LINE__);
4351 put_tty_driver(serial_driver);
4352 serial_driver = NULL;
4353 return rc;
4354 }
4355
4356 printk("%s %s, tty major#%d\n",
4357 driver_name, driver_version,
4358 serial_driver->major);
4359 return 0;
4360}
4361
4362/* enumerate user specified ISA adapters
4363 */
4364static void mgsl_enum_isa_devices(void)
4365{
4366 struct mgsl_struct *info;
4367 int i;
4368
4369 /* Check for user specified ISA devices */
4370
4371 for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
4372 if ( debug_level >= DEBUG_LEVEL_INFO )
4373 printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
4374 io[i], irq[i], dma[i] );
4375
4376 info = mgsl_allocate_device();
4377 if ( !info ) {
4378 /* error allocating device instance data */
4379 if ( debug_level >= DEBUG_LEVEL_ERROR )
4380 printk( "can't allocate device instance data.\n");
4381 continue;
4382 }
4383
4384 /* Copy user configuration info to device instance data */
4385 info->io_base = (unsigned int)io[i];
4386 info->irq_level = (unsigned int)irq[i];
4387 info->irq_level = irq_canonicalize(info->irq_level);
4388 info->dma_level = (unsigned int)dma[i];
4389 info->bus_type = MGSL_BUS_TYPE_ISA;
4390 info->io_addr_size = 16;
4391 info->irq_flags = 0;
4392
4393 mgsl_add_device( info );
4394 }
4395}
4396
4397static void synclink_cleanup(void)
4398{
4399 int rc;
4400 struct mgsl_struct *info;
4401 struct mgsl_struct *tmp;
4402
4403 printk("Unloading %s: %s\n", driver_name, driver_version);
4404
4405 if (serial_driver) {
4406 if ((rc = tty_unregister_driver(serial_driver)))
4407 printk("%s(%d) failed to unregister tty driver err=%d\n",
4408 __FILE__,__LINE__,rc);
4409 put_tty_driver(serial_driver);
4410 }
4411
4412 info = mgsl_device_list;
4413 while(info) {
4414#if SYNCLINK_GENERIC_HDLC
4415 hdlcdev_exit(info);
4416#endif
4417 mgsl_release_resources(info);
4418 tmp = info;
4419 info = info->next_device;
4420 kfree(tmp);
4421 }
4422
4423 if (pci_registered)
4424 pci_unregister_driver(&synclink_pci_driver);
4425}
4426
4427static int __init synclink_init(void)
4428{
4429 int rc;
4430
4431 if (break_on_load) {
4432 mgsl_get_text_ptr();
4433 BREAKPOINT();
4434 }
4435
4436 printk("%s %s\n", driver_name, driver_version);
4437
4438 mgsl_enum_isa_devices();
4439 if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
4440 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4441 else
4442 pci_registered = true;
4443
4444 if ((rc = mgsl_init_tty()) < 0)
4445 goto error;
4446
4447 return 0;
4448
4449error:
4450 synclink_cleanup();
4451 return rc;
4452}
4453
4454static void __exit synclink_exit(void)
4455{
4456 synclink_cleanup();
4457}
4458
4459module_init(synclink_init);
4460module_exit(synclink_exit);
4461
4462/*
4463 * usc_RTCmd()
4464 *
4465 * Issue a USC Receive/Transmit command to the
4466 * Channel Command/Address Register (CCAR).
4467 *
4468 * Notes:
4469 *
4470 * The command is encoded in the most significant 5 bits <15..11>
4471 * of the CCAR value. Bits <10..7> of the CCAR must be preserved
4472 * and Bits <6..0> must be written as zeros.
4473 *
4474 * Arguments:
4475 *
4476 * info pointer to device information structure
4477 * Cmd command mask (use symbolic macros)
4478 *
4479 * Return Value:
4480 *
4481 * None
4482 */
4483static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
4484{
4485 /* output command to CCAR in bits <15..11> */
4486 /* preserve bits <10..7>, bits <6..0> must be zero */
4487
4488 outw( Cmd + info->loopback_bits, info->io_base + CCAR );
4489
4490 /* Read to flush write to CCAR */
4491 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4492 inw( info->io_base + CCAR );
4493
4494} /* end of usc_RTCmd() */
4495
4496/*
4497 * usc_DmaCmd()
4498 *
4499 * Issue a DMA command to the DMA Command/Address Register (DCAR).
4500 *
4501 * Arguments:
4502 *
4503 * info pointer to device information structure
4504 * Cmd DMA command mask (usc_DmaCmd_XX Macros)
4505 *
4506 * Return Value:
4507 *
4508 * None
4509 */
4510static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
4511{
4512 /* write command mask to DCAR */
4513 outw( Cmd + info->mbre_bit, info->io_base );
4514
4515 /* Read to flush write to DCAR */
4516 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4517 inw( info->io_base );
4518
4519} /* end of usc_DmaCmd() */
4520
4521/*
4522 * usc_OutDmaReg()
4523 *
4524 * Write a 16-bit value to a USC DMA register
4525 *
4526 * Arguments:
4527 *
4528 * info pointer to device info structure
4529 * RegAddr register address (number) for write
4530 * RegValue 16-bit value to write to register
4531 *
4532 * Return Value:
4533 *
4534 * None
4535 *
4536 */
4537static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4538{
4539 /* Note: The DCAR is located at the adapter base address */
4540 /* Note: must preserve state of BIT8 in DCAR */
4541
4542 outw( RegAddr + info->mbre_bit, info->io_base );
4543 outw( RegValue, info->io_base );
4544
4545 /* Read to flush write to DCAR */
4546 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4547 inw( info->io_base );
4548
4549} /* end of usc_OutDmaReg() */
4550
4551/*
4552 * usc_InDmaReg()
4553 *
4554 * Read a 16-bit value from a DMA register
4555 *
4556 * Arguments:
4557 *
4558 * info pointer to device info structure
4559 * RegAddr register address (number) to read from
4560 *
4561 * Return Value:
4562 *
4563 * The 16-bit value read from register
4564 *
4565 */
4566static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
4567{
4568 /* Note: The DCAR is located at the adapter base address */
4569 /* Note: must preserve state of BIT8 in DCAR */
4570
4571 outw( RegAddr + info->mbre_bit, info->io_base );
4572 return inw( info->io_base );
4573
4574} /* end of usc_InDmaReg() */
4575
4576/*
4577 *
4578 * usc_OutReg()
4579 *
4580 * Write a 16-bit value to a USC serial channel register
4581 *
4582 * Arguments:
4583 *
4584 * info pointer to device info structure
4585 * RegAddr register address (number) to write to
4586 * RegValue 16-bit value to write to register
4587 *
4588 * Return Value:
4589 *
4590 * None
4591 *
4592 */
4593static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4594{
4595 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4596 outw( RegValue, info->io_base + CCAR );
4597
4598 /* Read to flush write to CCAR */
4599 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4600 inw( info->io_base + CCAR );
4601
4602} /* end of usc_OutReg() */
4603
4604/*
4605 * usc_InReg()
4606 *
4607 * Reads a 16-bit value from a USC serial channel register
4608 *
4609 * Arguments:
4610 *
4611 * info pointer to device extension
4612 * RegAddr register address (number) to read from
4613 *
4614 * Return Value:
4615 *
4616 * 16-bit value read from register
4617 */
4618static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
4619{
4620 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4621 return inw( info->io_base + CCAR );
4622
4623} /* end of usc_InReg() */
4624
4625/* usc_set_sdlc_mode()
4626 *
4627 * Set up the adapter for SDLC DMA communications.
4628 *
4629 * Arguments: info pointer to device instance data
4630 * Return Value: NONE
4631 */
4632static void usc_set_sdlc_mode( struct mgsl_struct *info )
4633{
4634 u16 RegValue;
4635 bool PreSL1660;
4636
4637 /*
4638 * determine if the IUSC on the adapter is pre-SL1660. If
4639 * not, take advantage of the UnderWait feature of more
4640 * modern chips. If an underrun occurs and this bit is set,
4641 * the transmitter will idle the programmed idle pattern
4642 * until the driver has time to service the underrun. Otherwise,
4643 * the dma controller may get the cycles previously requested
4644 * and begin transmitting queued tx data.
4645 */
4646 usc_OutReg(info,TMCR,0x1f);
4647 RegValue=usc_InReg(info,TMDR);
4648 PreSL1660 = (RegValue == IUSC_PRE_SL1660);
4649
4650 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
4651 {
4652 /*
4653 ** Channel Mode Register (CMR)
4654 **
4655 ** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
4656 ** <13> 0 0 = Transmit Disabled (initially)
4657 ** <12> 0 1 = Consecutive Idles share common 0
4658 ** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
4659 ** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
4660 ** <3..0> 0110 Receiver Mode = HDLC/SDLC
4661 **
4662 ** 1000 1110 0000 0110 = 0x8e06
4663 */
4664 RegValue = 0x8e06;
4665
4666 /*--------------------------------------------------
4667 * ignore user options for UnderRun Actions and
4668 * preambles
4669 *--------------------------------------------------*/
4670 }
4671 else
4672 {
4673 /* Channel mode Register (CMR)
4674 *
4675 * <15..14> 00 Tx Sub modes, Underrun Action
4676 * <13> 0 1 = Send Preamble before opening flag
4677 * <12> 0 1 = Consecutive Idles share common 0
4678 * <11..8> 0110 Transmitter mode = HDLC/SDLC
4679 * <7..4> 0000 Rx Sub modes, addr/ctrl field handling
4680 * <3..0> 0110 Receiver mode = HDLC/SDLC
4681 *
4682 * 0000 0110 0000 0110 = 0x0606
4683 */
4684 if (info->params.mode == MGSL_MODE_RAW) {
4685 RegValue = 0x0001; /* Set Receive mode = external sync */
4686
4687 usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
4688 (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
4689
4690 /*
4691 * TxSubMode:
4692 * CMR <15> 0 Don't send CRC on Tx Underrun
4693 * CMR <14> x undefined
4694 * CMR <13> 0 Send preamble before openning sync
4695 * CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
4696 *
4697 * TxMode:
4698 * CMR <11-8) 0100 MonoSync
4699 *
4700 * 0x00 0100 xxxx xxxx 04xx
4701 */
4702 RegValue |= 0x0400;
4703 }
4704 else {
4705
4706 RegValue = 0x0606;
4707
4708 if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
4709 RegValue |= BIT14;
4710 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
4711 RegValue |= BIT15;
4712 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
4713 RegValue |= BIT15 + BIT14;
4714 }
4715
4716 if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
4717 RegValue |= BIT13;
4718 }
4719
4720 if ( info->params.mode == MGSL_MODE_HDLC &&
4721 (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
4722 RegValue |= BIT12;
4723
4724 if ( info->params.addr_filter != 0xff )
4725 {
4726 /* set up receive address filtering */
4727 usc_OutReg( info, RSR, info->params.addr_filter );
4728 RegValue |= BIT4;
4729 }
4730
4731 usc_OutReg( info, CMR, RegValue );
4732 info->cmr_value = RegValue;
4733
4734 /* Receiver mode Register (RMR)
4735 *
4736 * <15..13> 000 encoding
4737 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4738 * <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
4739 * <9> 0 1 = Include Receive chars in CRC
4740 * <8> 1 1 = Use Abort/PE bit as abort indicator
4741 * <7..6> 00 Even parity
4742 * <5> 0 parity disabled
4743 * <4..2> 000 Receive Char Length = 8 bits
4744 * <1..0> 00 Disable Receiver
4745 *
4746 * 0000 0101 0000 0000 = 0x0500
4747 */
4748
4749 RegValue = 0x0500;
4750
4751 switch ( info->params.encoding ) {
4752 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4753 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4754 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4755 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4756 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4757 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4758 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4759 }
4760
4761 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4762 RegValue |= BIT9;
4763 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4764 RegValue |= ( BIT12 | BIT10 | BIT9 );
4765
4766 usc_OutReg( info, RMR, RegValue );
4767
4768 /* Set the Receive count Limit Register (RCLR) to 0xffff. */
4769 /* When an opening flag of an SDLC frame is recognized the */
4770 /* Receive Character count (RCC) is loaded with the value in */
4771 /* RCLR. The RCC is decremented for each received byte. The */
4772 /* value of RCC is stored after the closing flag of the frame */
4773 /* allowing the frame size to be computed. */
4774
4775 usc_OutReg( info, RCLR, RCLRVALUE );
4776
4777 usc_RCmd( info, RCmd_SelectRicrdma_level );
4778
4779 /* Receive Interrupt Control Register (RICR)
4780 *
4781 * <15..8> ? RxFIFO DMA Request Level
4782 * <7> 0 Exited Hunt IA (Interrupt Arm)
4783 * <6> 0 Idle Received IA
4784 * <5> 0 Break/Abort IA
4785 * <4> 0 Rx Bound IA
4786 * <3> 1 Queued status reflects oldest 2 bytes in FIFO
4787 * <2> 0 Abort/PE IA
4788 * <1> 1 Rx Overrun IA
4789 * <0> 0 Select TC0 value for readback
4790 *
4791 * 0000 0000 0000 1000 = 0x000a
4792 */
4793
4794 /* Carry over the Exit Hunt and Idle Received bits */
4795 /* in case they have been armed by usc_ArmEvents. */
4796
4797 RegValue = usc_InReg( info, RICR ) & 0xc0;
4798
4799 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4800 usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
4801 else
4802 usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
4803
4804 /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
4805
4806 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
4807 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
4808
4809 /* Transmit mode Register (TMR)
4810 *
4811 * <15..13> 000 encoding
4812 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4813 * <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
4814 * <9> 0 1 = Tx CRC Enabled
4815 * <8> 0 1 = Append CRC to end of transmit frame
4816 * <7..6> 00 Transmit parity Even
4817 * <5> 0 Transmit parity Disabled
4818 * <4..2> 000 Tx Char Length = 8 bits
4819 * <1..0> 00 Disable Transmitter
4820 *
4821 * 0000 0100 0000 0000 = 0x0400
4822 */
4823
4824 RegValue = 0x0400;
4825
4826 switch ( info->params.encoding ) {
4827 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4828 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4829 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4830 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4831 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4832 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4833 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4834 }
4835
4836 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4837 RegValue |= BIT9 + BIT8;
4838 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4839 RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
4840
4841 usc_OutReg( info, TMR, RegValue );
4842
4843 usc_set_txidle( info );
4844
4845
4846 usc_TCmd( info, TCmd_SelectTicrdma_level );
4847
4848 /* Transmit Interrupt Control Register (TICR)
4849 *
4850 * <15..8> ? Transmit FIFO DMA Level
4851 * <7> 0 Present IA (Interrupt Arm)
4852 * <6> 0 Idle Sent IA
4853 * <5> 1 Abort Sent IA
4854 * <4> 1 EOF/EOM Sent IA
4855 * <3> 0 CRC Sent IA
4856 * <2> 1 1 = Wait for SW Trigger to Start Frame
4857 * <1> 1 Tx Underrun IA
4858 * <0> 0 TC0 constant on read back
4859 *
4860 * 0000 0000 0011 0110 = 0x0036
4861 */
4862
4863 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4864 usc_OutReg( info, TICR, 0x0736 );
4865 else
4866 usc_OutReg( info, TICR, 0x1436 );
4867
4868 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
4869 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
4870
4871 /*
4872 ** Transmit Command/Status Register (TCSR)
4873 **
4874 ** <15..12> 0000 TCmd
4875 ** <11> 0/1 UnderWait
4876 ** <10..08> 000 TxIdle
4877 ** <7> x PreSent
4878 ** <6> x IdleSent
4879 ** <5> x AbortSent
4880 ** <4> x EOF/EOM Sent
4881 ** <3> x CRC Sent
4882 ** <2> x All Sent
4883 ** <1> x TxUnder
4884 ** <0> x TxEmpty
4885 **
4886 ** 0000 0000 0000 0000 = 0x0000
4887 */
4888 info->tcsr_value = 0;
4889
4890 if ( !PreSL1660 )
4891 info->tcsr_value |= TCSR_UNDERWAIT;
4892
4893 usc_OutReg( info, TCSR, info->tcsr_value );
4894
4895 /* Clock mode Control Register (CMCR)
4896 *
4897 * <15..14> 00 counter 1 Source = Disabled
4898 * <13..12> 00 counter 0 Source = Disabled
4899 * <11..10> 11 BRG1 Input is TxC Pin
4900 * <9..8> 11 BRG0 Input is TxC Pin
4901 * <7..6> 01 DPLL Input is BRG1 Output
4902 * <5..3> XXX TxCLK comes from Port 0
4903 * <2..0> XXX RxCLK comes from Port 1
4904 *
4905 * 0000 1111 0111 0111 = 0x0f77
4906 */
4907
4908 RegValue = 0x0f40;
4909
4910 if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
4911 RegValue |= 0x0003; /* RxCLK from DPLL */
4912 else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
4913 RegValue |= 0x0004; /* RxCLK from BRG0 */
4914 else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4915 RegValue |= 0x0006; /* RxCLK from TXC Input */
4916 else
4917 RegValue |= 0x0007; /* RxCLK from Port1 */
4918
4919 if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
4920 RegValue |= 0x0018; /* TxCLK from DPLL */
4921 else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
4922 RegValue |= 0x0020; /* TxCLK from BRG0 */
4923 else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4924 RegValue |= 0x0038; /* RxCLK from TXC Input */
4925 else
4926 RegValue |= 0x0030; /* TxCLK from Port0 */
4927
4928 usc_OutReg( info, CMCR, RegValue );
4929
4930
4931 /* Hardware Configuration Register (HCR)
4932 *
4933 * <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
4934 * <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
4935 * <12> 0 CVOK:0=report code violation in biphase
4936 * <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
4937 * <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
4938 * <7..6> 00 reserved
4939 * <5> 0 BRG1 mode:0=continuous,1=single cycle
4940 * <4> X BRG1 Enable
4941 * <3..2> 00 reserved
4942 * <1> 0 BRG0 mode:0=continuous,1=single cycle
4943 * <0> 0 BRG0 Enable
4944 */
4945
4946 RegValue = 0x0000;
4947
4948 if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
4949 u32 XtalSpeed;
4950 u32 DpllDivisor;
4951 u16 Tc;
4952
4953 /* DPLL is enabled. Use BRG1 to provide continuous reference clock */
4954 /* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
4955
4956 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4957 XtalSpeed = 11059200;
4958 else
4959 XtalSpeed = 14745600;
4960
4961 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4962 DpllDivisor = 16;
4963 RegValue |= BIT10;
4964 }
4965 else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4966 DpllDivisor = 8;
4967 RegValue |= BIT11;
4968 }
4969 else
4970 DpllDivisor = 32;
4971
4972 /* Tc = (Xtal/Speed) - 1 */
4973 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
4974 /* then rounding up gives a more precise time constant. Instead */
4975 /* of rounding up and then subtracting 1 we just don't subtract */
4976 /* the one in this case. */
4977
4978 /*--------------------------------------------------
4979 * ejz: for DPLL mode, application should use the
4980 * same clock speed as the partner system, even
4981 * though clocking is derived from the input RxData.
4982 * In case the user uses a 0 for the clock speed,
4983 * default to 0xffffffff and don't try to divide by
4984 * zero
4985 *--------------------------------------------------*/
4986 if ( info->params.clock_speed )
4987 {
4988 Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
4989 if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
4990 / info->params.clock_speed) )
4991 Tc--;
4992 }
4993 else
4994 Tc = -1;
4995
4996
4997 /* Write 16-bit Time Constant for BRG1 */
4998 usc_OutReg( info, TC1R, Tc );
4999
5000 RegValue |= BIT4; /* enable BRG1 */
5001
5002 switch ( info->params.encoding ) {
5003 case HDLC_ENCODING_NRZ:
5004 case HDLC_ENCODING_NRZB:
5005 case HDLC_ENCODING_NRZI_MARK:
5006 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
5007 case HDLC_ENCODING_BIPHASE_MARK:
5008 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
5009 case HDLC_ENCODING_BIPHASE_LEVEL:
5010 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
5011 }
5012 }
5013
5014 usc_OutReg( info, HCR, RegValue );
5015
5016
5017 /* Channel Control/status Register (CCSR)
5018 *
5019 * <15> X RCC FIFO Overflow status (RO)
5020 * <14> X RCC FIFO Not Empty status (RO)
5021 * <13> 0 1 = Clear RCC FIFO (WO)
5022 * <12> X DPLL Sync (RW)
5023 * <11> X DPLL 2 Missed Clocks status (RO)
5024 * <10> X DPLL 1 Missed Clock status (RO)
5025 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
5026 * <7> X SDLC Loop On status (RO)
5027 * <6> X SDLC Loop Send status (RO)
5028 * <5> 1 Bypass counters for TxClk and RxClk (RW)
5029 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
5030 * <1..0> 00 reserved
5031 *
5032 * 0000 0000 0010 0000 = 0x0020
5033 */
5034
5035 usc_OutReg( info, CCSR, 0x1020 );
5036
5037
5038 if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
5039 usc_OutReg( info, SICR,
5040 (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
5041 }
5042
5043
5044 /* enable Master Interrupt Enable bit (MIE) */
5045 usc_EnableMasterIrqBit( info );
5046
5047 usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
5048 TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
5049
5050 /* arm RCC underflow interrupt */
5051 usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
5052 usc_EnableInterrupts(info, MISC);
5053
5054 info->mbre_bit = 0;
5055 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5056 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5057 info->mbre_bit = BIT8;
5058 outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
5059
5060 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
5061 /* Enable DMAEN (Port 7, Bit 14) */
5062 /* This connects the DMA request signal to the ISA bus */
5063 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
5064 }
5065
5066 /* DMA Control Register (DCR)
5067 *
5068 * <15..14> 10 Priority mode = Alternating Tx/Rx
5069 * 01 Rx has priority
5070 * 00 Tx has priority
5071 *
5072 * <13> 1 Enable Priority Preempt per DCR<15..14>
5073 * (WARNING DCR<11..10> must be 00 when this is 1)
5074 * 0 Choose activate channel per DCR<11..10>
5075 *
5076 * <12> 0 Little Endian for Array/List
5077 * <11..10> 00 Both Channels can use each bus grant
5078 * <9..6> 0000 reserved
5079 * <5> 0 7 CLK - Minimum Bus Re-request Interval
5080 * <4> 0 1 = drive D/C and S/D pins
5081 * <3> 1 1 = Add one wait state to all DMA cycles.
5082 * <2> 0 1 = Strobe /UAS on every transfer.
5083 * <1..0> 11 Addr incrementing only affects LS24 bits
5084 *
5085 * 0110 0000 0000 1011 = 0x600b
5086 */
5087
5088 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5089 /* PCI adapter does not need DMA wait state */
5090 usc_OutDmaReg( info, DCR, 0xa00b );
5091 }
5092 else
5093 usc_OutDmaReg( info, DCR, 0x800b );
5094
5095
5096 /* Receive DMA mode Register (RDMR)
5097 *
5098 * <15..14> 11 DMA mode = Linked List Buffer mode
5099 * <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
5100 * <12> 1 Clear count of List Entry after fetching
5101 * <11..10> 00 Address mode = Increment
5102 * <9> 1 Terminate Buffer on RxBound
5103 * <8> 0 Bus Width = 16bits
5104 * <7..0> ? status Bits (write as 0s)
5105 *
5106 * 1111 0010 0000 0000 = 0xf200
5107 */
5108
5109 usc_OutDmaReg( info, RDMR, 0xf200 );
5110
5111
5112 /* Transmit DMA mode Register (TDMR)
5113 *
5114 * <15..14> 11 DMA mode = Linked List Buffer mode
5115 * <13> 1 TCBinA/L = fetch Tx Control Block from List entry
5116 * <12> 1 Clear count of List Entry after fetching
5117 * <11..10> 00 Address mode = Increment
5118 * <9> 1 Terminate Buffer on end of frame
5119 * <8> 0 Bus Width = 16bits
5120 * <7..0> ? status Bits (Read Only so write as 0)
5121 *
5122 * 1111 0010 0000 0000 = 0xf200
5123 */
5124
5125 usc_OutDmaReg( info, TDMR, 0xf200 );
5126
5127
5128 /* DMA Interrupt Control Register (DICR)
5129 *
5130 * <15> 1 DMA Interrupt Enable
5131 * <14> 0 1 = Disable IEO from USC
5132 * <13> 0 1 = Don't provide vector during IntAck
5133 * <12> 1 1 = Include status in Vector
5134 * <10..2> 0 reserved, Must be 0s
5135 * <1> 0 1 = Rx DMA Interrupt Enabled
5136 * <0> 0 1 = Tx DMA Interrupt Enabled
5137 *
5138 * 1001 0000 0000 0000 = 0x9000
5139 */
5140
5141 usc_OutDmaReg( info, DICR, 0x9000 );
5142
5143 usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
5144 usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
5145 usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
5146
5147 /* Channel Control Register (CCR)
5148 *
5149 * <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
5150 * <13> 0 Trigger Tx on SW Command Disabled
5151 * <12> 0 Flag Preamble Disabled
5152 * <11..10> 00 Preamble Length
5153 * <9..8> 00 Preamble Pattern
5154 * <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
5155 * <5> 0 Trigger Rx on SW Command Disabled
5156 * <4..0> 0 reserved
5157 *
5158 * 1000 0000 1000 0000 = 0x8080
5159 */
5160
5161 RegValue = 0x8080;
5162
5163 switch ( info->params.preamble_length ) {
5164 case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
5165 case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
5166 case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
5167 }
5168
5169 switch ( info->params.preamble ) {
5170 case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
5171 case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
5172 case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
5173 case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
5174 }
5175
5176 usc_OutReg( info, CCR, RegValue );
5177
5178
5179 /*
5180 * Burst/Dwell Control Register
5181 *
5182 * <15..8> 0x20 Maximum number of transfers per bus grant
5183 * <7..0> 0x00 Maximum number of clock cycles per bus grant
5184 */
5185
5186 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5187 /* don't limit bus occupancy on PCI adapter */
5188 usc_OutDmaReg( info, BDCR, 0x0000 );
5189 }
5190 else
5191 usc_OutDmaReg( info, BDCR, 0x2000 );
5192
5193 usc_stop_transmitter(info);
5194 usc_stop_receiver(info);
5195
5196} /* end of usc_set_sdlc_mode() */
5197
5198/* usc_enable_loopback()
5199 *
5200 * Set the 16C32 for internal loopback mode.
5201 * The TxCLK and RxCLK signals are generated from the BRG0 and
5202 * the TxD is looped back to the RxD internally.
5203 *
5204 * Arguments: info pointer to device instance data
5205 * enable 1 = enable loopback, 0 = disable
5206 * Return Value: None
5207 */
5208static void usc_enable_loopback(struct mgsl_struct *info, int enable)
5209{
5210 if (enable) {
5211 /* blank external TXD output */
5212 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
5213
5214 /* Clock mode Control Register (CMCR)
5215 *
5216 * <15..14> 00 counter 1 Disabled
5217 * <13..12> 00 counter 0 Disabled
5218 * <11..10> 11 BRG1 Input is TxC Pin
5219 * <9..8> 11 BRG0 Input is TxC Pin
5220 * <7..6> 01 DPLL Input is BRG1 Output
5221 * <5..3> 100 TxCLK comes from BRG0
5222 * <2..0> 100 RxCLK comes from BRG0
5223 *
5224 * 0000 1111 0110 0100 = 0x0f64
5225 */
5226
5227 usc_OutReg( info, CMCR, 0x0f64 );
5228
5229 /* Write 16-bit Time Constant for BRG0 */
5230 /* use clock speed if available, otherwise use 8 for diagnostics */
5231 if (info->params.clock_speed) {
5232 if (info->bus_type == MGSL_BUS_TYPE_PCI)
5233 usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
5234 else
5235 usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
5236 } else
5237 usc_OutReg(info, TC0R, (u16)8);
5238
5239 /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
5240 mode = Continuous Set Bit 0 to enable BRG0. */
5241 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5242
5243 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5244 usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
5245
5246 /* set Internal Data loopback mode */
5247 info->loopback_bits = 0x300;
5248 outw( 0x0300, info->io_base + CCAR );
5249 } else {
5250 /* enable external TXD output */
5251 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
5252
5253 /* clear Internal Data loopback mode */
5254 info->loopback_bits = 0;
5255 outw( 0,info->io_base + CCAR );
5256 }
5257
5258} /* end of usc_enable_loopback() */
5259
5260/* usc_enable_aux_clock()
5261 *
5262 * Enabled the AUX clock output at the specified frequency.
5263 *
5264 * Arguments:
5265 *
5266 * info pointer to device extension
5267 * data_rate data rate of clock in bits per second
5268 * A data rate of 0 disables the AUX clock.
5269 *
5270 * Return Value: None
5271 */
5272static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
5273{
5274 u32 XtalSpeed;
5275 u16 Tc;
5276
5277 if ( data_rate ) {
5278 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5279 XtalSpeed = 11059200;
5280 else
5281 XtalSpeed = 14745600;
5282
5283
5284 /* Tc = (Xtal/Speed) - 1 */
5285 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5286 /* then rounding up gives a more precise time constant. Instead */
5287 /* of rounding up and then subtracting 1 we just don't subtract */
5288 /* the one in this case. */
5289
5290
5291 Tc = (u16)(XtalSpeed/data_rate);
5292 if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
5293 Tc--;
5294
5295 /* Write 16-bit Time Constant for BRG0 */
5296 usc_OutReg( info, TC0R, Tc );
5297
5298 /*
5299 * Hardware Configuration Register (HCR)
5300 * Clear Bit 1, BRG0 mode = Continuous
5301 * Set Bit 0 to enable BRG0.
5302 */
5303
5304 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5305
5306 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5307 usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
5308 } else {
5309 /* data rate == 0 so turn off BRG0 */
5310 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
5311 }
5312
5313} /* end of usc_enable_aux_clock() */
5314
5315/*
5316 *
5317 * usc_process_rxoverrun_sync()
5318 *
5319 * This function processes a receive overrun by resetting the
5320 * receive DMA buffers and issuing a Purge Rx FIFO command
5321 * to allow the receiver to continue receiving.
5322 *
5323 * Arguments:
5324 *
5325 * info pointer to device extension
5326 *
5327 * Return Value: None
5328 */
5329static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
5330{
5331 int start_index;
5332 int end_index;
5333 int frame_start_index;
5334 bool start_of_frame_found = false;
5335 bool end_of_frame_found = false;
5336 bool reprogram_dma = false;
5337
5338 DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
5339 u32 phys_addr;
5340
5341 usc_DmaCmd( info, DmaCmd_PauseRxChannel );
5342 usc_RCmd( info, RCmd_EnterHuntmode );
5343 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5344
5345 /* CurrentRxBuffer points to the 1st buffer of the next */
5346 /* possibly available receive frame. */
5347
5348 frame_start_index = start_index = end_index = info->current_rx_buffer;
5349
5350 /* Search for an unfinished string of buffers. This means */
5351 /* that a receive frame started (at least one buffer with */
5352 /* count set to zero) but there is no terminiting buffer */
5353 /* (status set to non-zero). */
5354
5355 while( !buffer_list[end_index].count )
5356 {
5357 /* Count field has been reset to zero by 16C32. */
5358 /* This buffer is currently in use. */
5359
5360 if ( !start_of_frame_found )
5361 {
5362 start_of_frame_found = true;
5363 frame_start_index = end_index;
5364 end_of_frame_found = false;
5365 }
5366
5367 if ( buffer_list[end_index].status )
5368 {
5369 /* Status field has been set by 16C32. */
5370 /* This is the last buffer of a received frame. */
5371
5372 /* We want to leave the buffers for this frame intact. */
5373 /* Move on to next possible frame. */
5374
5375 start_of_frame_found = false;
5376 end_of_frame_found = true;
5377 }
5378
5379 /* advance to next buffer entry in linked list */
5380 end_index++;
5381 if ( end_index == info->rx_buffer_count )
5382 end_index = 0;
5383
5384 if ( start_index == end_index )
5385 {
5386 /* The entire list has been searched with all Counts == 0 and */
5387 /* all Status == 0. The receive buffers are */
5388 /* completely screwed, reset all receive buffers! */
5389 mgsl_reset_rx_dma_buffers( info );
5390 frame_start_index = 0;
5391 start_of_frame_found = false;
5392 reprogram_dma = true;
5393 break;
5394 }
5395 }
5396
5397 if ( start_of_frame_found && !end_of_frame_found )
5398 {
5399 /* There is an unfinished string of receive DMA buffers */
5400 /* as a result of the receiver overrun. */
5401
5402 /* Reset the buffers for the unfinished frame */
5403 /* and reprogram the receive DMA controller to start */
5404 /* at the 1st buffer of unfinished frame. */
5405
5406 start_index = frame_start_index;
5407
5408 do
5409 {
5410 *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
5411
5412 /* Adjust index for wrap around. */
5413 if ( start_index == info->rx_buffer_count )
5414 start_index = 0;
5415
5416 } while( start_index != end_index );
5417
5418 reprogram_dma = true;
5419 }
5420
5421 if ( reprogram_dma )
5422 {
5423 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
5424 usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5425 usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5426
5427 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5428
5429 /* This empties the receive FIFO and loads the RCC with RCLR */
5430 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5431
5432 /* program 16C32 with physical address of 1st DMA buffer entry */
5433 phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
5434 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5435 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5436
5437 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5438 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5439 usc_EnableInterrupts( info, RECEIVE_STATUS );
5440
5441 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5442 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5443
5444 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5445 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5446 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5447 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5448 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5449 else
5450 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5451 }
5452 else
5453 {
5454 /* This empties the receive FIFO and loads the RCC with RCLR */
5455 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5456 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5457 }
5458
5459} /* end of usc_process_rxoverrun_sync() */
5460
5461/* usc_stop_receiver()
5462 *
5463 * Disable USC receiver
5464 *
5465 * Arguments: info pointer to device instance data
5466 * Return Value: None
5467 */
5468static void usc_stop_receiver( struct mgsl_struct *info )
5469{
5470 if (debug_level >= DEBUG_LEVEL_ISR)
5471 printk("%s(%d):usc_stop_receiver(%s)\n",
5472 __FILE__,__LINE__, info->device_name );
5473
5474 /* Disable receive DMA channel. */
5475 /* This also disables receive DMA channel interrupts */
5476 usc_DmaCmd( info, DmaCmd_ResetRxChannel );
5477
5478 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5479 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5480 usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
5481
5482 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5483
5484 /* This empties the receive FIFO and loads the RCC with RCLR */
5485 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5486 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5487
5488 info->rx_enabled = false;
5489 info->rx_overflow = false;
5490 info->rx_rcc_underrun = false;
5491
5492} /* end of stop_receiver() */
5493
5494/* usc_start_receiver()
5495 *
5496 * Enable the USC receiver
5497 *
5498 * Arguments: info pointer to device instance data
5499 * Return Value: None
5500 */
5501static void usc_start_receiver( struct mgsl_struct *info )
5502{
5503 u32 phys_addr;
5504
5505 if (debug_level >= DEBUG_LEVEL_ISR)
5506 printk("%s(%d):usc_start_receiver(%s)\n",
5507 __FILE__,__LINE__, info->device_name );
5508
5509 mgsl_reset_rx_dma_buffers( info );
5510 usc_stop_receiver( info );
5511
5512 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5513 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5514
5515 if ( info->params.mode == MGSL_MODE_HDLC ||
5516 info->params.mode == MGSL_MODE_RAW ) {
5517 /* DMA mode Transfers */
5518 /* Program the DMA controller. */
5519 /* Enable the DMA controller end of buffer interrupt. */
5520
5521 /* program 16C32 with physical address of 1st DMA buffer entry */
5522 phys_addr = info->rx_buffer_list[0].phys_entry;
5523 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5524 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5525
5526 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5527 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5528 usc_EnableInterrupts( info, RECEIVE_STATUS );
5529
5530 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5531 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5532
5533 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5534 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5535 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5536 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5537 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5538 else
5539 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5540 } else {
5541 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
5542 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
5543 usc_EnableInterrupts(info, RECEIVE_DATA);
5544
5545 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5546 usc_RCmd( info, RCmd_EnterHuntmode );
5547
5548 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5549 }
5550
5551 usc_OutReg( info, CCSR, 0x1020 );
5552
5553 info->rx_enabled = true;
5554
5555} /* end of usc_start_receiver() */
5556
5557/* usc_start_transmitter()
5558 *
5559 * Enable the USC transmitter and send a transmit frame if
5560 * one is loaded in the DMA buffers.
5561 *
5562 * Arguments: info pointer to device instance data
5563 * Return Value: None
5564 */
5565static void usc_start_transmitter( struct mgsl_struct *info )
5566{
5567 u32 phys_addr;
5568 unsigned int FrameSize;
5569
5570 if (debug_level >= DEBUG_LEVEL_ISR)
5571 printk("%s(%d):usc_start_transmitter(%s)\n",
5572 __FILE__,__LINE__, info->device_name );
5573
5574 if ( info->xmit_cnt ) {
5575
5576 /* If auto RTS enabled and RTS is inactive, then assert */
5577 /* RTS and set a flag indicating that the driver should */
5578 /* negate RTS when the transmission completes. */
5579
5580 info->drop_rts_on_tx_done = false;
5581
5582 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
5583 usc_get_serial_signals( info );
5584 if ( !(info->serial_signals & SerialSignal_RTS) ) {
5585 info->serial_signals |= SerialSignal_RTS;
5586 usc_set_serial_signals( info );
5587 info->drop_rts_on_tx_done = true;
5588 }
5589 }
5590
5591
5592 if ( info->params.mode == MGSL_MODE_ASYNC ) {
5593 if ( !info->tx_active ) {
5594 usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
5595 usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
5596 usc_EnableInterrupts(info, TRANSMIT_DATA);
5597 usc_load_txfifo(info);
5598 }
5599 } else {
5600 /* Disable transmit DMA controller while programming. */
5601 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5602
5603 /* Transmit DMA buffer is loaded, so program USC */
5604 /* to send the frame contained in the buffers. */
5605
5606 FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
5607
5608 /* if operating in Raw sync mode, reset the rcc component
5609 * of the tx dma buffer entry, otherwise, the serial controller
5610 * will send a closing sync char after this count.
5611 */
5612 if ( info->params.mode == MGSL_MODE_RAW )
5613 info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
5614
5615 /* Program the Transmit Character Length Register (TCLR) */
5616 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
5617 usc_OutReg( info, TCLR, (u16)FrameSize );
5618
5619 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5620
5621 /* Program the address of the 1st DMA Buffer Entry in linked list */
5622 phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
5623 usc_OutDmaReg( info, NTARL, (u16)phys_addr );
5624 usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
5625
5626 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5627 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5628 usc_EnableInterrupts( info, TRANSMIT_STATUS );
5629
5630 if ( info->params.mode == MGSL_MODE_RAW &&
5631 info->num_tx_dma_buffers > 1 ) {
5632 /* When running external sync mode, attempt to 'stream' transmit */
5633 /* by filling tx dma buffers as they become available. To do this */
5634 /* we need to enable Tx DMA EOB Status interrupts : */
5635 /* */
5636 /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
5637 /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
5638
5639 usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
5640 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
5641 }
5642
5643 /* Initialize Transmit DMA Channel */
5644 usc_DmaCmd( info, DmaCmd_InitTxChannel );
5645
5646 usc_TCmd( info, TCmd_SendFrame );
5647
5648 mod_timer(&info->tx_timer, jiffies +
5649 msecs_to_jiffies(5000));
5650 }
5651 info->tx_active = true;
5652 }
5653
5654 if ( !info->tx_enabled ) {
5655 info->tx_enabled = true;
5656 if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
5657 usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
5658 else
5659 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
5660 }
5661
5662} /* end of usc_start_transmitter() */
5663
5664/* usc_stop_transmitter()
5665 *
5666 * Stops the transmitter and DMA
5667 *
5668 * Arguments: info pointer to device isntance data
5669 * Return Value: None
5670 */
5671static void usc_stop_transmitter( struct mgsl_struct *info )
5672{
5673 if (debug_level >= DEBUG_LEVEL_ISR)
5674 printk("%s(%d):usc_stop_transmitter(%s)\n",
5675 __FILE__,__LINE__, info->device_name );
5676
5677 del_timer(&info->tx_timer);
5678
5679 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5680 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5681 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5682
5683 usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
5684 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5685 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5686
5687 info->tx_enabled = false;
5688 info->tx_active = false;
5689
5690} /* end of usc_stop_transmitter() */
5691
5692/* usc_load_txfifo()
5693 *
5694 * Fill the transmit FIFO until the FIFO is full or
5695 * there is no more data to load.
5696 *
5697 * Arguments: info pointer to device extension (instance data)
5698 * Return Value: None
5699 */
5700static void usc_load_txfifo( struct mgsl_struct *info )
5701{
5702 int Fifocount;
5703 u8 TwoBytes[2];
5704
5705 if ( !info->xmit_cnt && !info->x_char )
5706 return;
5707
5708 /* Select transmit FIFO status readback in TICR */
5709 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
5710
5711 /* load the Transmit FIFO until FIFOs full or all data sent */
5712
5713 while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
5714 /* there is more space in the transmit FIFO and */
5715 /* there is more data in transmit buffer */
5716
5717 if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
5718 /* write a 16-bit word from transmit buffer to 16C32 */
5719
5720 TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
5721 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5722 TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
5723 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5724
5725 outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
5726
5727 info->xmit_cnt -= 2;
5728 info->icount.tx += 2;
5729 } else {
5730 /* only 1 byte left to transmit or 1 FIFO slot left */
5731
5732 outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
5733 info->io_base + CCAR );
5734
5735 if (info->x_char) {
5736 /* transmit pending high priority char */
5737 outw( info->x_char,info->io_base + CCAR );
5738 info->x_char = 0;
5739 } else {
5740 outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
5741 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5742 info->xmit_cnt--;
5743 }
5744 info->icount.tx++;
5745 }
5746 }
5747
5748} /* end of usc_load_txfifo() */
5749
5750/* usc_reset()
5751 *
5752 * Reset the adapter to a known state and prepare it for further use.
5753 *
5754 * Arguments: info pointer to device instance data
5755 * Return Value: None
5756 */
5757static void usc_reset( struct mgsl_struct *info )
5758{
5759 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5760 int i;
5761 u32 readval;
5762
5763 /* Set BIT30 of Misc Control Register */
5764 /* (Local Control Register 0x50) to force reset of USC. */
5765
5766 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5767 u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
5768
5769 info->misc_ctrl_value |= BIT30;
5770 *MiscCtrl = info->misc_ctrl_value;
5771
5772 /*
5773 * Force at least 170ns delay before clearing
5774 * reset bit. Each read from LCR takes at least
5775 * 30ns so 10 times for 300ns to be safe.
5776 */
5777 for(i=0;i<10;i++)
5778 readval = *MiscCtrl;
5779
5780 info->misc_ctrl_value &= ~BIT30;
5781 *MiscCtrl = info->misc_ctrl_value;
5782
5783 *LCR0BRDR = BUS_DESCRIPTOR(
5784 1, // Write Strobe Hold (0-3)
5785 2, // Write Strobe Delay (0-3)
5786 2, // Read Strobe Delay (0-3)
5787 0, // NWDD (Write data-data) (0-3)
5788 4, // NWAD (Write Addr-data) (0-31)
5789 0, // NXDA (Read/Write Data-Addr) (0-3)
5790 0, // NRDD (Read Data-Data) (0-3)
5791 5 // NRAD (Read Addr-Data) (0-31)
5792 );
5793 } else {
5794 /* do HW reset */
5795 outb( 0,info->io_base + 8 );
5796 }
5797
5798 info->mbre_bit = 0;
5799 info->loopback_bits = 0;
5800 info->usc_idle_mode = 0;
5801
5802 /*
5803 * Program the Bus Configuration Register (BCR)
5804 *
5805 * <15> 0 Don't use separate address
5806 * <14..6> 0 reserved
5807 * <5..4> 00 IAckmode = Default, don't care
5808 * <3> 1 Bus Request Totem Pole output
5809 * <2> 1 Use 16 Bit data bus
5810 * <1> 0 IRQ Totem Pole output
5811 * <0> 0 Don't Shift Right Addr
5812 *
5813 * 0000 0000 0000 1100 = 0x000c
5814 *
5815 * By writing to io_base + SDPIN the Wait/Ack pin is
5816 * programmed to work as a Wait pin.
5817 */
5818
5819 outw( 0x000c,info->io_base + SDPIN );
5820
5821
5822 outw( 0,info->io_base );
5823 outw( 0,info->io_base + CCAR );
5824
5825 /* select little endian byte ordering */
5826 usc_RTCmd( info, RTCmd_SelectLittleEndian );
5827
5828
5829 /* Port Control Register (PCR)
5830 *
5831 * <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
5832 * <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
5833 * <11..10> 00 Port 5 is Input (No Connect, Don't Care)
5834 * <9..8> 00 Port 4 is Input (No Connect, Don't Care)
5835 * <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
5836 * <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
5837 * <3..2> 01 Port 1 is Input (Dedicated RxC)
5838 * <1..0> 01 Port 0 is Input (Dedicated TxC)
5839 *
5840 * 1111 0000 1111 0101 = 0xf0f5
5841 */
5842
5843 usc_OutReg( info, PCR, 0xf0f5 );
5844
5845
5846 /*
5847 * Input/Output Control Register
5848 *
5849 * <15..14> 00 CTS is active low input
5850 * <13..12> 00 DCD is active low input
5851 * <11..10> 00 TxREQ pin is input (DSR)
5852 * <9..8> 00 RxREQ pin is input (RI)
5853 * <7..6> 00 TxD is output (Transmit Data)
5854 * <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
5855 * <2..0> 100 RxC is Output (drive with BRG0)
5856 *
5857 * 0000 0000 0000 0100 = 0x0004
5858 */
5859
5860 usc_OutReg( info, IOCR, 0x0004 );
5861
5862} /* end of usc_reset() */
5863
5864/* usc_set_async_mode()
5865 *
5866 * Program adapter for asynchronous communications.
5867 *
5868 * Arguments: info pointer to device instance data
5869 * Return Value: None
5870 */
5871static void usc_set_async_mode( struct mgsl_struct *info )
5872{
5873 u16 RegValue;
5874
5875 /* disable interrupts while programming USC */
5876 usc_DisableMasterIrqBit( info );
5877
5878 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5879 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5880
5881 usc_loopback_frame( info );
5882
5883 /* Channel mode Register (CMR)
5884 *
5885 * <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
5886 * <13..12> 00 00 = 16X Clock
5887 * <11..8> 0000 Transmitter mode = Asynchronous
5888 * <7..6> 00 reserved?
5889 * <5..4> 00 Rx Sub modes, 00 = 16X Clock
5890 * <3..0> 0000 Receiver mode = Asynchronous
5891 *
5892 * 0000 0000 0000 0000 = 0x0
5893 */
5894
5895 RegValue = 0;
5896 if ( info->params.stop_bits != 1 )
5897 RegValue |= BIT14;
5898 usc_OutReg( info, CMR, RegValue );
5899
5900
5901 /* Receiver mode Register (RMR)
5902 *
5903 * <15..13> 000 encoding = None
5904 * <12..08> 00000 reserved (Sync Only)
5905 * <7..6> 00 Even parity
5906 * <5> 0 parity disabled
5907 * <4..2> 000 Receive Char Length = 8 bits
5908 * <1..0> 00 Disable Receiver
5909 *
5910 * 0000 0000 0000 0000 = 0x0
5911 */
5912
5913 RegValue = 0;
5914
5915 if ( info->params.data_bits != 8 )
5916 RegValue |= BIT4+BIT3+BIT2;
5917
5918 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5919 RegValue |= BIT5;
5920 if ( info->params.parity != ASYNC_PARITY_ODD )
5921 RegValue |= BIT6;
5922 }
5923
5924 usc_OutReg( info, RMR, RegValue );
5925
5926
5927 /* Set IRQ trigger level */
5928
5929 usc_RCmd( info, RCmd_SelectRicrIntLevel );
5930
5931
5932 /* Receive Interrupt Control Register (RICR)
5933 *
5934 * <15..8> ? RxFIFO IRQ Request Level
5935 *
5936 * Note: For async mode the receive FIFO level must be set
5937 * to 0 to avoid the situation where the FIFO contains fewer bytes
5938 * than the trigger level and no more data is expected.
5939 *
5940 * <7> 0 Exited Hunt IA (Interrupt Arm)
5941 * <6> 0 Idle Received IA
5942 * <5> 0 Break/Abort IA
5943 * <4> 0 Rx Bound IA
5944 * <3> 0 Queued status reflects oldest byte in FIFO
5945 * <2> 0 Abort/PE IA
5946 * <1> 0 Rx Overrun IA
5947 * <0> 0 Select TC0 value for readback
5948 *
5949 * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
5950 */
5951
5952 usc_OutReg( info, RICR, 0x0000 );
5953
5954 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5955 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
5956
5957
5958 /* Transmit mode Register (TMR)
5959 *
5960 * <15..13> 000 encoding = None
5961 * <12..08> 00000 reserved (Sync Only)
5962 * <7..6> 00 Transmit parity Even
5963 * <5> 0 Transmit parity Disabled
5964 * <4..2> 000 Tx Char Length = 8 bits
5965 * <1..0> 00 Disable Transmitter
5966 *
5967 * 0000 0000 0000 0000 = 0x0
5968 */
5969
5970 RegValue = 0;
5971
5972 if ( info->params.data_bits != 8 )
5973 RegValue |= BIT4+BIT3+BIT2;
5974
5975 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5976 RegValue |= BIT5;
5977 if ( info->params.parity != ASYNC_PARITY_ODD )
5978 RegValue |= BIT6;
5979 }
5980
5981 usc_OutReg( info, TMR, RegValue );
5982
5983 usc_set_txidle( info );
5984
5985
5986 /* Set IRQ trigger level */
5987
5988 usc_TCmd( info, TCmd_SelectTicrIntLevel );
5989
5990
5991 /* Transmit Interrupt Control Register (TICR)
5992 *
5993 * <15..8> ? Transmit FIFO IRQ Level
5994 * <7> 0 Present IA (Interrupt Arm)
5995 * <6> 1 Idle Sent IA
5996 * <5> 0 Abort Sent IA
5997 * <4> 0 EOF/EOM Sent IA
5998 * <3> 0 CRC Sent IA
5999 * <2> 0 1 = Wait for SW Trigger to Start Frame
6000 * <1> 0 Tx Underrun IA
6001 * <0> 0 TC0 constant on read back
6002 *
6003 * 0000 0000 0100 0000 = 0x0040
6004 */
6005
6006 usc_OutReg( info, TICR, 0x1f40 );
6007
6008 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
6009 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
6010
6011 usc_enable_async_clock( info, info->params.data_rate );
6012
6013
6014 /* Channel Control/status Register (CCSR)
6015 *
6016 * <15> X RCC FIFO Overflow status (RO)
6017 * <14> X RCC FIFO Not Empty status (RO)
6018 * <13> 0 1 = Clear RCC FIFO (WO)
6019 * <12> X DPLL in Sync status (RO)
6020 * <11> X DPLL 2 Missed Clocks status (RO)
6021 * <10> X DPLL 1 Missed Clock status (RO)
6022 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
6023 * <7> X SDLC Loop On status (RO)
6024 * <6> X SDLC Loop Send status (RO)
6025 * <5> 1 Bypass counters for TxClk and RxClk (RW)
6026 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
6027 * <1..0> 00 reserved
6028 *
6029 * 0000 0000 0010 0000 = 0x0020
6030 */
6031
6032 usc_OutReg( info, CCSR, 0x0020 );
6033
6034 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6035 RECEIVE_DATA + RECEIVE_STATUS );
6036
6037 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6038 RECEIVE_DATA + RECEIVE_STATUS );
6039
6040 usc_EnableMasterIrqBit( info );
6041
6042 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6043 /* Enable INTEN (Port 6, Bit12) */
6044 /* This connects the IRQ request signal to the ISA bus */
6045 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6046 }
6047
6048 if (info->params.loopback) {
6049 info->loopback_bits = 0x300;
6050 outw(0x0300, info->io_base + CCAR);
6051 }
6052
6053} /* end of usc_set_async_mode() */
6054
6055/* usc_loopback_frame()
6056 *
6057 * Loop back a small (2 byte) dummy SDLC frame.
6058 * Interrupts and DMA are NOT used. The purpose of this is to
6059 * clear any 'stale' status info left over from running in async mode.
6060 *
6061 * The 16C32 shows the strange behaviour of marking the 1st
6062 * received SDLC frame with a CRC error even when there is no
6063 * CRC error. To get around this a small dummy from of 2 bytes
6064 * is looped back when switching from async to sync mode.
6065 *
6066 * Arguments: info pointer to device instance data
6067 * Return Value: None
6068 */
6069static void usc_loopback_frame( struct mgsl_struct *info )
6070{
6071 int i;
6072 unsigned long oldmode = info->params.mode;
6073
6074 info->params.mode = MGSL_MODE_HDLC;
6075
6076 usc_DisableMasterIrqBit( info );
6077
6078 usc_set_sdlc_mode( info );
6079 usc_enable_loopback( info, 1 );
6080
6081 /* Write 16-bit Time Constant for BRG0 */
6082 usc_OutReg( info, TC0R, 0 );
6083
6084 /* Channel Control Register (CCR)
6085 *
6086 * <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
6087 * <13> 0 Trigger Tx on SW Command Disabled
6088 * <12> 0 Flag Preamble Disabled
6089 * <11..10> 00 Preamble Length = 8-Bits
6090 * <9..8> 01 Preamble Pattern = flags
6091 * <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
6092 * <5> 0 Trigger Rx on SW Command Disabled
6093 * <4..0> 0 reserved
6094 *
6095 * 0000 0001 0000 0000 = 0x0100
6096 */
6097
6098 usc_OutReg( info, CCR, 0x0100 );
6099
6100 /* SETUP RECEIVER */
6101 usc_RTCmd( info, RTCmd_PurgeRxFifo );
6102 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
6103
6104 /* SETUP TRANSMITTER */
6105 /* Program the Transmit Character Length Register (TCLR) */
6106 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
6107 usc_OutReg( info, TCLR, 2 );
6108 usc_RTCmd( info, RTCmd_PurgeTxFifo );
6109
6110 /* unlatch Tx status bits, and start transmit channel. */
6111 usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
6112 outw(0,info->io_base + DATAREG);
6113
6114 /* ENABLE TRANSMITTER */
6115 usc_TCmd( info, TCmd_SendFrame );
6116 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
6117
6118 /* WAIT FOR RECEIVE COMPLETE */
6119 for (i=0 ; i<1000 ; i++)
6120 if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
6121 break;
6122
6123 /* clear Internal Data loopback mode */
6124 usc_enable_loopback(info, 0);
6125
6126 usc_EnableMasterIrqBit(info);
6127
6128 info->params.mode = oldmode;
6129
6130} /* end of usc_loopback_frame() */
6131
6132/* usc_set_sync_mode() Programs the USC for SDLC communications.
6133 *
6134 * Arguments: info pointer to adapter info structure
6135 * Return Value: None
6136 */
6137static void usc_set_sync_mode( struct mgsl_struct *info )
6138{
6139 usc_loopback_frame( info );
6140 usc_set_sdlc_mode( info );
6141
6142 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6143 /* Enable INTEN (Port 6, Bit12) */
6144 /* This connects the IRQ request signal to the ISA bus */
6145 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6146 }
6147
6148 usc_enable_aux_clock(info, info->params.clock_speed);
6149
6150 if (info->params.loopback)
6151 usc_enable_loopback(info,1);
6152
6153} /* end of mgsl_set_sync_mode() */
6154
6155/* usc_set_txidle() Set the HDLC idle mode for the transmitter.
6156 *
6157 * Arguments: info pointer to device instance data
6158 * Return Value: None
6159 */
6160static void usc_set_txidle( struct mgsl_struct *info )
6161{
6162 u16 usc_idle_mode = IDLEMODE_FLAGS;
6163
6164 /* Map API idle mode to USC register bits */
6165
6166 switch( info->idle_mode ){
6167 case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
6168 case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
6169 case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
6170 case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
6171 case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
6172 case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
6173 case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
6174 }
6175
6176 info->usc_idle_mode = usc_idle_mode;
6177 //usc_OutReg(info, TCSR, usc_idle_mode);
6178 info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
6179 info->tcsr_value += usc_idle_mode;
6180 usc_OutReg(info, TCSR, info->tcsr_value);
6181
6182 /*
6183 * if SyncLink WAN adapter is running in external sync mode, the
6184 * transmitter has been set to Monosync in order to try to mimic
6185 * a true raw outbound bit stream. Monosync still sends an open/close
6186 * sync char at the start/end of a frame. Try to match those sync
6187 * patterns to the idle mode set here
6188 */
6189 if ( info->params.mode == MGSL_MODE_RAW ) {
6190 unsigned char syncpat = 0;
6191 switch( info->idle_mode ) {
6192 case HDLC_TXIDLE_FLAGS:
6193 syncpat = 0x7e;
6194 break;
6195 case HDLC_TXIDLE_ALT_ZEROS_ONES:
6196 syncpat = 0x55;
6197 break;
6198 case HDLC_TXIDLE_ZEROS:
6199 case HDLC_TXIDLE_SPACE:
6200 syncpat = 0x00;
6201 break;
6202 case HDLC_TXIDLE_ONES:
6203 case HDLC_TXIDLE_MARK:
6204 syncpat = 0xff;
6205 break;
6206 case HDLC_TXIDLE_ALT_MARK_SPACE:
6207 syncpat = 0xaa;
6208 break;
6209 }
6210
6211 usc_SetTransmitSyncChars(info,syncpat,syncpat);
6212 }
6213
6214} /* end of usc_set_txidle() */
6215
6216/* usc_get_serial_signals()
6217 *
6218 * Query the adapter for the state of the V24 status (input) signals.
6219 *
6220 * Arguments: info pointer to device instance data
6221 * Return Value: None
6222 */
6223static void usc_get_serial_signals( struct mgsl_struct *info )
6224{
6225 u16 status;
6226
6227 /* clear all serial signals except DTR and RTS */
6228 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
6229
6230 /* Read the Misc Interrupt status Register (MISR) to get */
6231 /* the V24 status signals. */
6232
6233 status = usc_InReg( info, MISR );
6234
6235 /* set serial signal bits to reflect MISR */
6236
6237 if ( status & MISCSTATUS_CTS )
6238 info->serial_signals |= SerialSignal_CTS;
6239
6240 if ( status & MISCSTATUS_DCD )
6241 info->serial_signals |= SerialSignal_DCD;
6242
6243 if ( status & MISCSTATUS_RI )
6244 info->serial_signals |= SerialSignal_RI;
6245
6246 if ( status & MISCSTATUS_DSR )
6247 info->serial_signals |= SerialSignal_DSR;
6248
6249} /* end of usc_get_serial_signals() */
6250
6251/* usc_set_serial_signals()
6252 *
6253 * Set the state of DTR and RTS based on contents of
6254 * serial_signals member of device extension.
6255 *
6256 * Arguments: info pointer to device instance data
6257 * Return Value: None
6258 */
6259static void usc_set_serial_signals( struct mgsl_struct *info )
6260{
6261 u16 Control;
6262 unsigned char V24Out = info->serial_signals;
6263
6264 /* get the current value of the Port Control Register (PCR) */
6265
6266 Control = usc_InReg( info, PCR );
6267
6268 if ( V24Out & SerialSignal_RTS )
6269 Control &= ~(BIT6);
6270 else
6271 Control |= BIT6;
6272
6273 if ( V24Out & SerialSignal_DTR )
6274 Control &= ~(BIT4);
6275 else
6276 Control |= BIT4;
6277
6278 usc_OutReg( info, PCR, Control );
6279
6280} /* end of usc_set_serial_signals() */
6281
6282/* usc_enable_async_clock()
6283 *
6284 * Enable the async clock at the specified frequency.
6285 *
6286 * Arguments: info pointer to device instance data
6287 * data_rate data rate of clock in bps
6288 * 0 disables the AUX clock.
6289 * Return Value: None
6290 */
6291static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
6292{
6293 if ( data_rate ) {
6294 /*
6295 * Clock mode Control Register (CMCR)
6296 *
6297 * <15..14> 00 counter 1 Disabled
6298 * <13..12> 00 counter 0 Disabled
6299 * <11..10> 11 BRG1 Input is TxC Pin
6300 * <9..8> 11 BRG0 Input is TxC Pin
6301 * <7..6> 01 DPLL Input is BRG1 Output
6302 * <5..3> 100 TxCLK comes from BRG0
6303 * <2..0> 100 RxCLK comes from BRG0
6304 *
6305 * 0000 1111 0110 0100 = 0x0f64
6306 */
6307
6308 usc_OutReg( info, CMCR, 0x0f64 );
6309
6310
6311 /*
6312 * Write 16-bit Time Constant for BRG0
6313 * Time Constant = (ClkSpeed / data_rate) - 1
6314 * ClkSpeed = 921600 (ISA), 691200 (PCI)
6315 */
6316
6317 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6318 usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
6319 else
6320 usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
6321
6322
6323 /*
6324 * Hardware Configuration Register (HCR)
6325 * Clear Bit 1, BRG0 mode = Continuous
6326 * Set Bit 0 to enable BRG0.
6327 */
6328
6329 usc_OutReg( info, HCR,
6330 (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
6331
6332
6333 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
6334
6335 usc_OutReg( info, IOCR,
6336 (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
6337 } else {
6338 /* data rate == 0 so turn off BRG0 */
6339 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
6340 }
6341
6342} /* end of usc_enable_async_clock() */
6343
6344/*
6345 * Buffer Structures:
6346 *
6347 * Normal memory access uses virtual addresses that can make discontiguous
6348 * physical memory pages appear to be contiguous in the virtual address
6349 * space (the processors memory mapping handles the conversions).
6350 *
6351 * DMA transfers require physically contiguous memory. This is because
6352 * the DMA system controller and DMA bus masters deal with memory using
6353 * only physical addresses.
6354 *
6355 * This causes a problem under Windows NT when large DMA buffers are
6356 * needed. Fragmentation of the nonpaged pool prevents allocations of
6357 * physically contiguous buffers larger than the PAGE_SIZE.
6358 *
6359 * However the 16C32 supports Bus Master Scatter/Gather DMA which
6360 * allows DMA transfers to physically discontiguous buffers. Information
6361 * about each data transfer buffer is contained in a memory structure
6362 * called a 'buffer entry'. A list of buffer entries is maintained
6363 * to track and control the use of the data transfer buffers.
6364 *
6365 * To support this strategy we will allocate sufficient PAGE_SIZE
6366 * contiguous memory buffers to allow for the total required buffer
6367 * space.
6368 *
6369 * The 16C32 accesses the list of buffer entries using Bus Master
6370 * DMA. Control information is read from the buffer entries by the
6371 * 16C32 to control data transfers. status information is written to
6372 * the buffer entries by the 16C32 to indicate the status of completed
6373 * transfers.
6374 *
6375 * The CPU writes control information to the buffer entries to control
6376 * the 16C32 and reads status information from the buffer entries to
6377 * determine information about received and transmitted frames.
6378 *
6379 * Because the CPU and 16C32 (adapter) both need simultaneous access
6380 * to the buffer entries, the buffer entry memory is allocated with
6381 * HalAllocateCommonBuffer(). This restricts the size of the buffer
6382 * entry list to PAGE_SIZE.
6383 *
6384 * The actual data buffers on the other hand will only be accessed
6385 * by the CPU or the adapter but not by both simultaneously. This allows
6386 * Scatter/Gather packet based DMA procedures for using physically
6387 * discontiguous pages.
6388 */
6389
6390/*
6391 * mgsl_reset_tx_dma_buffers()
6392 *
6393 * Set the count for all transmit buffers to 0 to indicate the
6394 * buffer is available for use and set the current buffer to the
6395 * first buffer. This effectively makes all buffers free and
6396 * discards any data in buffers.
6397 *
6398 * Arguments: info pointer to device instance data
6399 * Return Value: None
6400 */
6401static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
6402{
6403 unsigned int i;
6404
6405 for ( i = 0; i < info->tx_buffer_count; i++ ) {
6406 *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
6407 }
6408
6409 info->current_tx_buffer = 0;
6410 info->start_tx_dma_buffer = 0;
6411 info->tx_dma_buffers_used = 0;
6412
6413 info->get_tx_holding_index = 0;
6414 info->put_tx_holding_index = 0;
6415 info->tx_holding_count = 0;
6416
6417} /* end of mgsl_reset_tx_dma_buffers() */
6418
6419/*
6420 * num_free_tx_dma_buffers()
6421 *
6422 * returns the number of free tx dma buffers available
6423 *
6424 * Arguments: info pointer to device instance data
6425 * Return Value: number of free tx dma buffers
6426 */
6427static int num_free_tx_dma_buffers(struct mgsl_struct *info)
6428{
6429 return info->tx_buffer_count - info->tx_dma_buffers_used;
6430}
6431
6432/*
6433 * mgsl_reset_rx_dma_buffers()
6434 *
6435 * Set the count for all receive buffers to DMABUFFERSIZE
6436 * and set the current buffer to the first buffer. This effectively
6437 * makes all buffers free and discards any data in buffers.
6438 *
6439 * Arguments: info pointer to device instance data
6440 * Return Value: None
6441 */
6442static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
6443{
6444 unsigned int i;
6445
6446 for ( i = 0; i < info->rx_buffer_count; i++ ) {
6447 *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
6448// info->rx_buffer_list[i].count = DMABUFFERSIZE;
6449// info->rx_buffer_list[i].status = 0;
6450 }
6451
6452 info->current_rx_buffer = 0;
6453
6454} /* end of mgsl_reset_rx_dma_buffers() */
6455
6456/*
6457 * mgsl_free_rx_frame_buffers()
6458 *
6459 * Free the receive buffers used by a received SDLC
6460 * frame such that the buffers can be reused.
6461 *
6462 * Arguments:
6463 *
6464 * info pointer to device instance data
6465 * StartIndex index of 1st receive buffer of frame
6466 * EndIndex index of last receive buffer of frame
6467 *
6468 * Return Value: None
6469 */
6470static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
6471{
6472 bool Done = false;
6473 DMABUFFERENTRY *pBufEntry;
6474 unsigned int Index;
6475
6476 /* Starting with 1st buffer entry of the frame clear the status */
6477 /* field and set the count field to DMA Buffer Size. */
6478
6479 Index = StartIndex;
6480
6481 while( !Done ) {
6482 pBufEntry = &(info->rx_buffer_list[Index]);
6483
6484 if ( Index == EndIndex ) {
6485 /* This is the last buffer of the frame! */
6486 Done = true;
6487 }
6488
6489 /* reset current buffer for reuse */
6490// pBufEntry->status = 0;
6491// pBufEntry->count = DMABUFFERSIZE;
6492 *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
6493
6494 /* advance to next buffer entry in linked list */
6495 Index++;
6496 if ( Index == info->rx_buffer_count )
6497 Index = 0;
6498 }
6499
6500 /* set current buffer to next buffer after last buffer of frame */
6501 info->current_rx_buffer = Index;
6502
6503} /* end of free_rx_frame_buffers() */
6504
6505/* mgsl_get_rx_frame()
6506 *
6507 * This function attempts to return a received SDLC frame from the
6508 * receive DMA buffers. Only frames received without errors are returned.
6509 *
6510 * Arguments: info pointer to device extension
6511 * Return Value: true if frame returned, otherwise false
6512 */
6513static bool mgsl_get_rx_frame(struct mgsl_struct *info)
6514{
6515 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
6516 unsigned short status;
6517 DMABUFFERENTRY *pBufEntry;
6518 unsigned int framesize = 0;
6519 bool ReturnCode = false;
6520 unsigned long flags;
6521 struct tty_struct *tty = info->port.tty;
6522 bool return_frame = false;
6523
6524 /*
6525 * current_rx_buffer points to the 1st buffer of the next available
6526 * receive frame. To find the last buffer of the frame look for
6527 * a non-zero status field in the buffer entries. (The status
6528 * field is set by the 16C32 after completing a receive frame.
6529 */
6530
6531 StartIndex = EndIndex = info->current_rx_buffer;
6532
6533 while( !info->rx_buffer_list[EndIndex].status ) {
6534 /*
6535 * If the count field of the buffer entry is non-zero then
6536 * this buffer has not been used. (The 16C32 clears the count
6537 * field when it starts using the buffer.) If an unused buffer
6538 * is encountered then there are no frames available.
6539 */
6540
6541 if ( info->rx_buffer_list[EndIndex].count )
6542 goto Cleanup;
6543
6544 /* advance to next buffer entry in linked list */
6545 EndIndex++;
6546 if ( EndIndex == info->rx_buffer_count )
6547 EndIndex = 0;
6548
6549 /* if entire list searched then no frame available */
6550 if ( EndIndex == StartIndex ) {
6551 /* If this occurs then something bad happened,
6552 * all buffers have been 'used' but none mark
6553 * the end of a frame. Reset buffers and receiver.
6554 */
6555
6556 if ( info->rx_enabled ){
6557 spin_lock_irqsave(&info->irq_spinlock,flags);
6558 usc_start_receiver(info);
6559 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6560 }
6561 goto Cleanup;
6562 }
6563 }
6564
6565
6566 /* check status of receive frame */
6567
6568 status = info->rx_buffer_list[EndIndex].status;
6569
6570 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6571 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6572 if ( status & RXSTATUS_SHORT_FRAME )
6573 info->icount.rxshort++;
6574 else if ( status & RXSTATUS_ABORT )
6575 info->icount.rxabort++;
6576 else if ( status & RXSTATUS_OVERRUN )
6577 info->icount.rxover++;
6578 else {
6579 info->icount.rxcrc++;
6580 if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
6581 return_frame = true;
6582 }
6583 framesize = 0;
6584#if SYNCLINK_GENERIC_HDLC
6585 {
6586 info->netdev->stats.rx_errors++;
6587 info->netdev->stats.rx_frame_errors++;
6588 }
6589#endif
6590 } else
6591 return_frame = true;
6592
6593 if ( return_frame ) {
6594 /* receive frame has no errors, get frame size.
6595 * The frame size is the starting value of the RCC (which was
6596 * set to 0xffff) minus the ending value of the RCC (decremented
6597 * once for each receive character) minus 2 for the 16-bit CRC.
6598 */
6599
6600 framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
6601
6602 /* adjust frame size for CRC if any */
6603 if ( info->params.crc_type == HDLC_CRC_16_CCITT )
6604 framesize -= 2;
6605 else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
6606 framesize -= 4;
6607 }
6608
6609 if ( debug_level >= DEBUG_LEVEL_BH )
6610 printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
6611 __FILE__,__LINE__,info->device_name,status,framesize);
6612
6613 if ( debug_level >= DEBUG_LEVEL_DATA )
6614 mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
6615 min_t(int, framesize, DMABUFFERSIZE),0);
6616
6617 if (framesize) {
6618 if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
6619 ((framesize+1) > info->max_frame_size) ) ||
6620 (framesize > info->max_frame_size) )
6621 info->icount.rxlong++;
6622 else {
6623 /* copy dma buffer(s) to contiguous intermediate buffer */
6624 int copy_count = framesize;
6625 int index = StartIndex;
6626 unsigned char *ptmp = info->intermediate_rxbuffer;
6627
6628 if ( !(status & RXSTATUS_CRC_ERROR))
6629 info->icount.rxok++;
6630
6631 while(copy_count) {
6632 int partial_count;
6633 if ( copy_count > DMABUFFERSIZE )
6634 partial_count = DMABUFFERSIZE;
6635 else
6636 partial_count = copy_count;
6637
6638 pBufEntry = &(info->rx_buffer_list[index]);
6639 memcpy( ptmp, pBufEntry->virt_addr, partial_count );
6640 ptmp += partial_count;
6641 copy_count -= partial_count;
6642
6643 if ( ++index == info->rx_buffer_count )
6644 index = 0;
6645 }
6646
6647 if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
6648 ++framesize;
6649 *ptmp = (status & RXSTATUS_CRC_ERROR ?
6650 RX_CRC_ERROR :
6651 RX_OK);
6652
6653 if ( debug_level >= DEBUG_LEVEL_DATA )
6654 printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
6655 __FILE__,__LINE__,info->device_name,
6656 *ptmp);
6657 }
6658
6659#if SYNCLINK_GENERIC_HDLC
6660 if (info->netcount)
6661 hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
6662 else
6663#endif
6664 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6665 }
6666 }
6667 /* Free the buffers used by this frame. */
6668 mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
6669
6670 ReturnCode = true;
6671
6672Cleanup:
6673
6674 if ( info->rx_enabled && info->rx_overflow ) {
6675 /* The receiver needs to restarted because of
6676 * a receive overflow (buffer or FIFO). If the
6677 * receive buffers are now empty, then restart receiver.
6678 */
6679
6680 if ( !info->rx_buffer_list[EndIndex].status &&
6681 info->rx_buffer_list[EndIndex].count ) {
6682 spin_lock_irqsave(&info->irq_spinlock,flags);
6683 usc_start_receiver(info);
6684 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6685 }
6686 }
6687
6688 return ReturnCode;
6689
6690} /* end of mgsl_get_rx_frame() */
6691
6692/* mgsl_get_raw_rx_frame()
6693 *
6694 * This function attempts to return a received frame from the
6695 * receive DMA buffers when running in external loop mode. In this mode,
6696 * we will return at most one DMABUFFERSIZE frame to the application.
6697 * The USC receiver is triggering off of DCD going active to start a new
6698 * frame, and DCD going inactive to terminate the frame (similar to
6699 * processing a closing flag character).
6700 *
6701 * In this routine, we will return DMABUFFERSIZE "chunks" at a time.
6702 * If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
6703 * status field and the RCC field will indicate the length of the
6704 * entire received frame. We take this RCC field and get the modulus
6705 * of RCC and DMABUFFERSIZE to determine if number of bytes in the
6706 * last Rx DMA buffer and return that last portion of the frame.
6707 *
6708 * Arguments: info pointer to device extension
6709 * Return Value: true if frame returned, otherwise false
6710 */
6711static bool mgsl_get_raw_rx_frame(struct mgsl_struct *info)
6712{
6713 unsigned int CurrentIndex, NextIndex;
6714 unsigned short status;
6715 DMABUFFERENTRY *pBufEntry;
6716 unsigned int framesize = 0;
6717 bool ReturnCode = false;
6718 unsigned long flags;
6719 struct tty_struct *tty = info->port.tty;
6720
6721 /*
6722 * current_rx_buffer points to the 1st buffer of the next available
6723 * receive frame. The status field is set by the 16C32 after
6724 * completing a receive frame. If the status field of this buffer
6725 * is zero, either the USC is still filling this buffer or this
6726 * is one of a series of buffers making up a received frame.
6727 *
6728 * If the count field of this buffer is zero, the USC is either
6729 * using this buffer or has used this buffer. Look at the count
6730 * field of the next buffer. If that next buffer's count is
6731 * non-zero, the USC is still actively using the current buffer.
6732 * Otherwise, if the next buffer's count field is zero, the
6733 * current buffer is complete and the USC is using the next
6734 * buffer.
6735 */
6736 CurrentIndex = NextIndex = info->current_rx_buffer;
6737 ++NextIndex;
6738 if ( NextIndex == info->rx_buffer_count )
6739 NextIndex = 0;
6740
6741 if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
6742 (info->rx_buffer_list[CurrentIndex].count == 0 &&
6743 info->rx_buffer_list[NextIndex].count == 0)) {
6744 /*
6745 * Either the status field of this dma buffer is non-zero
6746 * (indicating the last buffer of a receive frame) or the next
6747 * buffer is marked as in use -- implying this buffer is complete
6748 * and an intermediate buffer for this received frame.
6749 */
6750
6751 status = info->rx_buffer_list[CurrentIndex].status;
6752
6753 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6754 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6755 if ( status & RXSTATUS_SHORT_FRAME )
6756 info->icount.rxshort++;
6757 else if ( status & RXSTATUS_ABORT )
6758 info->icount.rxabort++;
6759 else if ( status & RXSTATUS_OVERRUN )
6760 info->icount.rxover++;
6761 else
6762 info->icount.rxcrc++;
6763 framesize = 0;
6764 } else {
6765 /*
6766 * A receive frame is available, get frame size and status.
6767 *
6768 * The frame size is the starting value of the RCC (which was
6769 * set to 0xffff) minus the ending value of the RCC (decremented
6770 * once for each receive character) minus 2 or 4 for the 16-bit
6771 * or 32-bit CRC.
6772 *
6773 * If the status field is zero, this is an intermediate buffer.
6774 * It's size is 4K.
6775 *
6776 * If the DMA Buffer Entry's Status field is non-zero, the
6777 * receive operation completed normally (ie: DCD dropped). The
6778 * RCC field is valid and holds the received frame size.
6779 * It is possible that the RCC field will be zero on a DMA buffer
6780 * entry with a non-zero status. This can occur if the total
6781 * frame size (number of bytes between the time DCD goes active
6782 * to the time DCD goes inactive) exceeds 65535 bytes. In this
6783 * case the 16C32 has underrun on the RCC count and appears to
6784 * stop updating this counter to let us know the actual received
6785 * frame size. If this happens (non-zero status and zero RCC),
6786 * simply return the entire RxDMA Buffer
6787 */
6788 if ( status ) {
6789 /*
6790 * In the event that the final RxDMA Buffer is
6791 * terminated with a non-zero status and the RCC
6792 * field is zero, we interpret this as the RCC
6793 * having underflowed (received frame > 65535 bytes).
6794 *
6795 * Signal the event to the user by passing back
6796 * a status of RxStatus_CrcError returning the full
6797 * buffer and let the app figure out what data is
6798 * actually valid
6799 */
6800 if ( info->rx_buffer_list[CurrentIndex].rcc )
6801 framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
6802 else
6803 framesize = DMABUFFERSIZE;
6804 }
6805 else
6806 framesize = DMABUFFERSIZE;
6807 }
6808
6809 if ( framesize > DMABUFFERSIZE ) {
6810 /*
6811 * if running in raw sync mode, ISR handler for
6812 * End Of Buffer events terminates all buffers at 4K.
6813 * If this frame size is said to be >4K, get the
6814 * actual number of bytes of the frame in this buffer.
6815 */
6816 framesize = framesize % DMABUFFERSIZE;
6817 }
6818
6819
6820 if ( debug_level >= DEBUG_LEVEL_BH )
6821 printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
6822 __FILE__,__LINE__,info->device_name,status,framesize);
6823
6824 if ( debug_level >= DEBUG_LEVEL_DATA )
6825 mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
6826 min_t(int, framesize, DMABUFFERSIZE),0);
6827
6828 if (framesize) {
6829 /* copy dma buffer(s) to contiguous intermediate buffer */
6830 /* NOTE: we never copy more than DMABUFFERSIZE bytes */
6831
6832 pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
6833 memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
6834 info->icount.rxok++;
6835
6836 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6837 }
6838
6839 /* Free the buffers used by this frame. */
6840 mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
6841
6842 ReturnCode = true;
6843 }
6844
6845
6846 if ( info->rx_enabled && info->rx_overflow ) {
6847 /* The receiver needs to restarted because of
6848 * a receive overflow (buffer or FIFO). If the
6849 * receive buffers are now empty, then restart receiver.
6850 */
6851
6852 if ( !info->rx_buffer_list[CurrentIndex].status &&
6853 info->rx_buffer_list[CurrentIndex].count ) {
6854 spin_lock_irqsave(&info->irq_spinlock,flags);
6855 usc_start_receiver(info);
6856 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6857 }
6858 }
6859
6860 return ReturnCode;
6861
6862} /* end of mgsl_get_raw_rx_frame() */
6863
6864/* mgsl_load_tx_dma_buffer()
6865 *
6866 * Load the transmit DMA buffer with the specified data.
6867 *
6868 * Arguments:
6869 *
6870 * info pointer to device extension
6871 * Buffer pointer to buffer containing frame to load
6872 * BufferSize size in bytes of frame in Buffer
6873 *
6874 * Return Value: None
6875 */
6876static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
6877 const char *Buffer, unsigned int BufferSize)
6878{
6879 unsigned short Copycount;
6880 unsigned int i = 0;
6881 DMABUFFERENTRY *pBufEntry;
6882
6883 if ( debug_level >= DEBUG_LEVEL_DATA )
6884 mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
6885
6886 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
6887 /* set CMR:13 to start transmit when
6888 * next GoAhead (abort) is received
6889 */
6890 info->cmr_value |= BIT13;
6891 }
6892
6893 /* begin loading the frame in the next available tx dma
6894 * buffer, remember it's starting location for setting
6895 * up tx dma operation
6896 */
6897 i = info->current_tx_buffer;
6898 info->start_tx_dma_buffer = i;
6899
6900 /* Setup the status and RCC (Frame Size) fields of the 1st */
6901 /* buffer entry in the transmit DMA buffer list. */
6902
6903 info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
6904 info->tx_buffer_list[i].rcc = BufferSize;
6905 info->tx_buffer_list[i].count = BufferSize;
6906
6907 /* Copy frame data from 1st source buffer to the DMA buffers. */
6908 /* The frame data may span multiple DMA buffers. */
6909
6910 while( BufferSize ){
6911 /* Get a pointer to next DMA buffer entry. */
6912 pBufEntry = &info->tx_buffer_list[i++];
6913
6914 if ( i == info->tx_buffer_count )
6915 i=0;
6916
6917 /* Calculate the number of bytes that can be copied from */
6918 /* the source buffer to this DMA buffer. */
6919 if ( BufferSize > DMABUFFERSIZE )
6920 Copycount = DMABUFFERSIZE;
6921 else
6922 Copycount = BufferSize;
6923
6924 /* Actually copy data from source buffer to DMA buffer. */
6925 /* Also set the data count for this individual DMA buffer. */
6926 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6927 mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
6928 else
6929 memcpy(pBufEntry->virt_addr, Buffer, Copycount);
6930
6931 pBufEntry->count = Copycount;
6932
6933 /* Advance source pointer and reduce remaining data count. */
6934 Buffer += Copycount;
6935 BufferSize -= Copycount;
6936
6937 ++info->tx_dma_buffers_used;
6938 }
6939
6940 /* remember next available tx dma buffer */
6941 info->current_tx_buffer = i;
6942
6943} /* end of mgsl_load_tx_dma_buffer() */
6944
6945/*
6946 * mgsl_register_test()
6947 *
6948 * Performs a register test of the 16C32.
6949 *
6950 * Arguments: info pointer to device instance data
6951 * Return Value: true if test passed, otherwise false
6952 */
6953static bool mgsl_register_test( struct mgsl_struct *info )
6954{
6955 static unsigned short BitPatterns[] =
6956 { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
6957 static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
6958 unsigned int i;
6959 bool rc = true;
6960 unsigned long flags;
6961
6962 spin_lock_irqsave(&info->irq_spinlock,flags);
6963 usc_reset(info);
6964
6965 /* Verify the reset state of some registers. */
6966
6967 if ( (usc_InReg( info, SICR ) != 0) ||
6968 (usc_InReg( info, IVR ) != 0) ||
6969 (usc_InDmaReg( info, DIVR ) != 0) ){
6970 rc = false;
6971 }
6972
6973 if ( rc ){
6974 /* Write bit patterns to various registers but do it out of */
6975 /* sync, then read back and verify values. */
6976
6977 for ( i = 0 ; i < Patterncount ; i++ ) {
6978 usc_OutReg( info, TC0R, BitPatterns[i] );
6979 usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
6980 usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
6981 usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
6982 usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
6983 usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
6984
6985 if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
6986 (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
6987 (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
6988 (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
6989 (usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
6990 (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
6991 rc = false;
6992 break;
6993 }
6994 }
6995 }
6996
6997 usc_reset(info);
6998 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6999
7000 return rc;
7001
7002} /* end of mgsl_register_test() */
7003
7004/* mgsl_irq_test() Perform interrupt test of the 16C32.
7005 *
7006 * Arguments: info pointer to device instance data
7007 * Return Value: true if test passed, otherwise false
7008 */
7009static bool mgsl_irq_test( struct mgsl_struct *info )
7010{
7011 unsigned long EndTime;
7012 unsigned long flags;
7013
7014 spin_lock_irqsave(&info->irq_spinlock,flags);
7015 usc_reset(info);
7016
7017 /*
7018 * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
7019 * The ISR sets irq_occurred to true.
7020 */
7021
7022 info->irq_occurred = false;
7023
7024 /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
7025 /* Enable INTEN (Port 6, Bit12) */
7026 /* This connects the IRQ request signal to the ISA bus */
7027 /* on the ISA adapter. This has no effect for the PCI adapter */
7028 usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
7029
7030 usc_EnableMasterIrqBit(info);
7031 usc_EnableInterrupts(info, IO_PIN);
7032 usc_ClearIrqPendingBits(info, IO_PIN);
7033
7034 usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
7035 usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
7036
7037 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7038
7039 EndTime=100;
7040 while( EndTime-- && !info->irq_occurred ) {
7041 msleep_interruptible(10);
7042 }
7043
7044 spin_lock_irqsave(&info->irq_spinlock,flags);
7045 usc_reset(info);
7046 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7047
7048 return info->irq_occurred;
7049
7050} /* end of mgsl_irq_test() */
7051
7052/* mgsl_dma_test()
7053 *
7054 * Perform a DMA test of the 16C32. A small frame is
7055 * transmitted via DMA from a transmit buffer to a receive buffer
7056 * using single buffer DMA mode.
7057 *
7058 * Arguments: info pointer to device instance data
7059 * Return Value: true if test passed, otherwise false
7060 */
7061static bool mgsl_dma_test( struct mgsl_struct *info )
7062{
7063 unsigned short FifoLevel;
7064 unsigned long phys_addr;
7065 unsigned int FrameSize;
7066 unsigned int i;
7067 char *TmpPtr;
7068 bool rc = true;
7069 unsigned short status=0;
7070 unsigned long EndTime;
7071 unsigned long flags;
7072 MGSL_PARAMS tmp_params;
7073
7074 /* save current port options */
7075 memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
7076 /* load default port options */
7077 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
7078
7079#define TESTFRAMESIZE 40
7080
7081 spin_lock_irqsave(&info->irq_spinlock,flags);
7082
7083 /* setup 16C32 for SDLC DMA transfer mode */
7084
7085 usc_reset(info);
7086 usc_set_sdlc_mode(info);
7087 usc_enable_loopback(info,1);
7088
7089 /* Reprogram the RDMR so that the 16C32 does NOT clear the count
7090 * field of the buffer entry after fetching buffer address. This
7091 * way we can detect a DMA failure for a DMA read (which should be
7092 * non-destructive to system memory) before we try and write to
7093 * memory (where a failure could corrupt system memory).
7094 */
7095
7096 /* Receive DMA mode Register (RDMR)
7097 *
7098 * <15..14> 11 DMA mode = Linked List Buffer mode
7099 * <13> 1 RSBinA/L = store Rx status Block in List entry
7100 * <12> 0 1 = Clear count of List Entry after fetching
7101 * <11..10> 00 Address mode = Increment
7102 * <9> 1 Terminate Buffer on RxBound
7103 * <8> 0 Bus Width = 16bits
7104 * <7..0> ? status Bits (write as 0s)
7105 *
7106 * 1110 0010 0000 0000 = 0xe200
7107 */
7108
7109 usc_OutDmaReg( info, RDMR, 0xe200 );
7110
7111 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7112
7113
7114 /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
7115
7116 FrameSize = TESTFRAMESIZE;
7117
7118 /* setup 1st transmit buffer entry: */
7119 /* with frame size and transmit control word */
7120
7121 info->tx_buffer_list[0].count = FrameSize;
7122 info->tx_buffer_list[0].rcc = FrameSize;
7123 info->tx_buffer_list[0].status = 0x4000;
7124
7125 /* build a transmit frame in 1st transmit DMA buffer */
7126
7127 TmpPtr = info->tx_buffer_list[0].virt_addr;
7128 for (i = 0; i < FrameSize; i++ )
7129 *TmpPtr++ = i;
7130
7131 /* setup 1st receive buffer entry: */
7132 /* clear status, set max receive buffer size */
7133
7134 info->rx_buffer_list[0].status = 0;
7135 info->rx_buffer_list[0].count = FrameSize + 4;
7136
7137 /* zero out the 1st receive buffer */
7138
7139 memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
7140
7141 /* Set count field of next buffer entries to prevent */
7142 /* 16C32 from using buffers after the 1st one. */
7143
7144 info->tx_buffer_list[1].count = 0;
7145 info->rx_buffer_list[1].count = 0;
7146
7147
7148 /***************************/
7149 /* Program 16C32 receiver. */
7150 /***************************/
7151
7152 spin_lock_irqsave(&info->irq_spinlock,flags);
7153
7154 /* setup DMA transfers */
7155 usc_RTCmd( info, RTCmd_PurgeRxFifo );
7156
7157 /* program 16C32 receiver with physical address of 1st DMA buffer entry */
7158 phys_addr = info->rx_buffer_list[0].phys_entry;
7159 usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
7160 usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
7161
7162 /* Clear the Rx DMA status bits (read RDMR) and start channel */
7163 usc_InDmaReg( info, RDMR );
7164 usc_DmaCmd( info, DmaCmd_InitRxChannel );
7165
7166 /* Enable Receiver (RMR <1..0> = 10) */
7167 usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
7168
7169 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7170
7171
7172 /*************************************************************/
7173 /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
7174 /*************************************************************/
7175
7176 /* Wait 100ms for interrupt. */
7177 EndTime = jiffies + msecs_to_jiffies(100);
7178
7179 for(;;) {
7180 if (time_after(jiffies, EndTime)) {
7181 rc = false;
7182 break;
7183 }
7184
7185 spin_lock_irqsave(&info->irq_spinlock,flags);
7186 status = usc_InDmaReg( info, RDMR );
7187 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7188
7189 if ( !(status & BIT4) && (status & BIT5) ) {
7190 /* INITG (BIT 4) is inactive (no entry read in progress) AND */
7191 /* BUSY (BIT 5) is active (channel still active). */
7192 /* This means the buffer entry read has completed. */
7193 break;
7194 }
7195 }
7196
7197
7198 /******************************/
7199 /* Program 16C32 transmitter. */
7200 /******************************/
7201
7202 spin_lock_irqsave(&info->irq_spinlock,flags);
7203
7204 /* Program the Transmit Character Length Register (TCLR) */
7205 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
7206
7207 usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
7208 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7209
7210 /* Program the address of the 1st DMA Buffer Entry in linked list */
7211
7212 phys_addr = info->tx_buffer_list[0].phys_entry;
7213 usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
7214 usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
7215
7216 /* unlatch Tx status bits, and start transmit channel. */
7217
7218 usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
7219 usc_DmaCmd( info, DmaCmd_InitTxChannel );
7220
7221 /* wait for DMA controller to fill transmit FIFO */
7222
7223 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
7224
7225 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7226
7227
7228 /**********************************/
7229 /* WAIT FOR TRANSMIT FIFO TO FILL */
7230 /**********************************/
7231
7232 /* Wait 100ms */
7233 EndTime = jiffies + msecs_to_jiffies(100);
7234
7235 for(;;) {
7236 if (time_after(jiffies, EndTime)) {
7237 rc = false;
7238 break;
7239 }
7240
7241 spin_lock_irqsave(&info->irq_spinlock,flags);
7242 FifoLevel = usc_InReg(info, TICR) >> 8;
7243 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7244
7245 if ( FifoLevel < 16 )
7246 break;
7247 else
7248 if ( FrameSize < 32 ) {
7249 /* This frame is smaller than the entire transmit FIFO */
7250 /* so wait for the entire frame to be loaded. */
7251 if ( FifoLevel <= (32 - FrameSize) )
7252 break;
7253 }
7254 }
7255
7256
7257 if ( rc )
7258 {
7259 /* Enable 16C32 transmitter. */
7260
7261 spin_lock_irqsave(&info->irq_spinlock,flags);
7262
7263 /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
7264 usc_TCmd( info, TCmd_SendFrame );
7265 usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
7266
7267 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7268
7269
7270 /******************************/
7271 /* WAIT FOR TRANSMIT COMPLETE */
7272 /******************************/
7273
7274 /* Wait 100ms */
7275 EndTime = jiffies + msecs_to_jiffies(100);
7276
7277 /* While timer not expired wait for transmit complete */
7278
7279 spin_lock_irqsave(&info->irq_spinlock,flags);
7280 status = usc_InReg( info, TCSR );
7281 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7282
7283 while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
7284 if (time_after(jiffies, EndTime)) {
7285 rc = false;
7286 break;
7287 }
7288
7289 spin_lock_irqsave(&info->irq_spinlock,flags);
7290 status = usc_InReg( info, TCSR );
7291 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7292 }
7293 }
7294
7295
7296 if ( rc ){
7297 /* CHECK FOR TRANSMIT ERRORS */
7298 if ( status & (BIT5 + BIT1) )
7299 rc = false;
7300 }
7301
7302 if ( rc ) {
7303 /* WAIT FOR RECEIVE COMPLETE */
7304
7305 /* Wait 100ms */
7306 EndTime = jiffies + msecs_to_jiffies(100);
7307
7308 /* Wait for 16C32 to write receive status to buffer entry. */
7309 status=info->rx_buffer_list[0].status;
7310 while ( status == 0 ) {
7311 if (time_after(jiffies, EndTime)) {
7312 rc = false;
7313 break;
7314 }
7315 status=info->rx_buffer_list[0].status;
7316 }
7317 }
7318
7319
7320 if ( rc ) {
7321 /* CHECK FOR RECEIVE ERRORS */
7322 status = info->rx_buffer_list[0].status;
7323
7324 if ( status & (BIT8 + BIT3 + BIT1) ) {
7325 /* receive error has occurred */
7326 rc = false;
7327 } else {
7328 if ( memcmp( info->tx_buffer_list[0].virt_addr ,
7329 info->rx_buffer_list[0].virt_addr, FrameSize ) ){
7330 rc = false;
7331 }
7332 }
7333 }
7334
7335 spin_lock_irqsave(&info->irq_spinlock,flags);
7336 usc_reset( info );
7337 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7338
7339 /* restore current port options */
7340 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
7341
7342 return rc;
7343
7344} /* end of mgsl_dma_test() */
7345
7346/* mgsl_adapter_test()
7347 *
7348 * Perform the register, IRQ, and DMA tests for the 16C32.
7349 *
7350 * Arguments: info pointer to device instance data
7351 * Return Value: 0 if success, otherwise -ENODEV
7352 */
7353static int mgsl_adapter_test( struct mgsl_struct *info )
7354{
7355 if ( debug_level >= DEBUG_LEVEL_INFO )
7356 printk( "%s(%d):Testing device %s\n",
7357 __FILE__,__LINE__,info->device_name );
7358
7359 if ( !mgsl_register_test( info ) ) {
7360 info->init_error = DiagStatus_AddressFailure;
7361 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
7362 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
7363 return -ENODEV;
7364 }
7365
7366 if ( !mgsl_irq_test( info ) ) {
7367 info->init_error = DiagStatus_IrqFailure;
7368 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
7369 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
7370 return -ENODEV;
7371 }
7372
7373 if ( !mgsl_dma_test( info ) ) {
7374 info->init_error = DiagStatus_DmaFailure;
7375 printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
7376 __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
7377 return -ENODEV;
7378 }
7379
7380 if ( debug_level >= DEBUG_LEVEL_INFO )
7381 printk( "%s(%d):device %s passed diagnostics\n",
7382 __FILE__,__LINE__,info->device_name );
7383
7384 return 0;
7385
7386} /* end of mgsl_adapter_test() */
7387
7388/* mgsl_memory_test()
7389 *
7390 * Test the shared memory on a PCI adapter.
7391 *
7392 * Arguments: info pointer to device instance data
7393 * Return Value: true if test passed, otherwise false
7394 */
7395static bool mgsl_memory_test( struct mgsl_struct *info )
7396{
7397 static unsigned long BitPatterns[] =
7398 { 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
7399 unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
7400 unsigned long i;
7401 unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
7402 unsigned long * TestAddr;
7403
7404 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
7405 return true;
7406
7407 TestAddr = (unsigned long *)info->memory_base;
7408
7409 /* Test data lines with test pattern at one location. */
7410
7411 for ( i = 0 ; i < Patterncount ; i++ ) {
7412 *TestAddr = BitPatterns[i];
7413 if ( *TestAddr != BitPatterns[i] )
7414 return false;
7415 }
7416
7417 /* Test address lines with incrementing pattern over */
7418 /* entire address range. */
7419
7420 for ( i = 0 ; i < TestLimit ; i++ ) {
7421 *TestAddr = i * 4;
7422 TestAddr++;
7423 }
7424
7425 TestAddr = (unsigned long *)info->memory_base;
7426
7427 for ( i = 0 ; i < TestLimit ; i++ ) {
7428 if ( *TestAddr != i * 4 )
7429 return false;
7430 TestAddr++;
7431 }
7432
7433 memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
7434
7435 return true;
7436
7437} /* End Of mgsl_memory_test() */
7438
7439
7440/* mgsl_load_pci_memory()
7441 *
7442 * Load a large block of data into the PCI shared memory.
7443 * Use this instead of memcpy() or memmove() to move data
7444 * into the PCI shared memory.
7445 *
7446 * Notes:
7447 *
7448 * This function prevents the PCI9050 interface chip from hogging
7449 * the adapter local bus, which can starve the 16C32 by preventing
7450 * 16C32 bus master cycles.
7451 *
7452 * The PCI9050 documentation says that the 9050 will always release
7453 * control of the local bus after completing the current read
7454 * or write operation.
7455 *
7456 * It appears that as long as the PCI9050 write FIFO is full, the
7457 * PCI9050 treats all of the writes as a single burst transaction
7458 * and will not release the bus. This causes DMA latency problems
7459 * at high speeds when copying large data blocks to the shared
7460 * memory.
7461 *
7462 * This function in effect, breaks the a large shared memory write
7463 * into multiple transations by interleaving a shared memory read
7464 * which will flush the write FIFO and 'complete' the write
7465 * transation. This allows any pending DMA request to gain control
7466 * of the local bus in a timely fasion.
7467 *
7468 * Arguments:
7469 *
7470 * TargetPtr pointer to target address in PCI shared memory
7471 * SourcePtr pointer to source buffer for data
7472 * count count in bytes of data to copy
7473 *
7474 * Return Value: None
7475 */
7476static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
7477 unsigned short count )
7478{
7479 /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
7480#define PCI_LOAD_INTERVAL 64
7481
7482 unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
7483 unsigned short Index;
7484 unsigned long Dummy;
7485
7486 for ( Index = 0 ; Index < Intervalcount ; Index++ )
7487 {
7488 memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
7489 Dummy = *((volatile unsigned long *)TargetPtr);
7490 TargetPtr += PCI_LOAD_INTERVAL;
7491 SourcePtr += PCI_LOAD_INTERVAL;
7492 }
7493
7494 memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
7495
7496} /* End Of mgsl_load_pci_memory() */
7497
7498static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
7499{
7500 int i;
7501 int linecount;
7502 if (xmit)
7503 printk("%s tx data:\n",info->device_name);
7504 else
7505 printk("%s rx data:\n",info->device_name);
7506
7507 while(count) {
7508 if (count > 16)
7509 linecount = 16;
7510 else
7511 linecount = count;
7512
7513 for(i=0;i<linecount;i++)
7514 printk("%02X ",(unsigned char)data[i]);
7515 for(;i<17;i++)
7516 printk(" ");
7517 for(i=0;i<linecount;i++) {
7518 if (data[i]>=040 && data[i]<=0176)
7519 printk("%c",data[i]);
7520 else
7521 printk(".");
7522 }
7523 printk("\n");
7524
7525 data += linecount;
7526 count -= linecount;
7527 }
7528} /* end of mgsl_trace_block() */
7529
7530/* mgsl_tx_timeout()
7531 *
7532 * called when HDLC frame times out
7533 * update stats and do tx completion processing
7534 *
7535 * Arguments: context pointer to device instance data
7536 * Return Value: None
7537 */
7538static void mgsl_tx_timeout(unsigned long context)
7539{
7540 struct mgsl_struct *info = (struct mgsl_struct*)context;
7541 unsigned long flags;
7542
7543 if ( debug_level >= DEBUG_LEVEL_INFO )
7544 printk( "%s(%d):mgsl_tx_timeout(%s)\n",
7545 __FILE__,__LINE__,info->device_name);
7546 if(info->tx_active &&
7547 (info->params.mode == MGSL_MODE_HDLC ||
7548 info->params.mode == MGSL_MODE_RAW) ) {
7549 info->icount.txtimeout++;
7550 }
7551 spin_lock_irqsave(&info->irq_spinlock,flags);
7552 info->tx_active = false;
7553 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
7554
7555 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
7556 usc_loopmode_cancel_transmit( info );
7557
7558 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7559
7560#if SYNCLINK_GENERIC_HDLC
7561 if (info->netcount)
7562 hdlcdev_tx_done(info);
7563 else
7564#endif
7565 mgsl_bh_transmit(info);
7566
7567} /* end of mgsl_tx_timeout() */
7568
7569/* signal that there are no more frames to send, so that
7570 * line is 'released' by echoing RxD to TxD when current
7571 * transmission is complete (or immediately if no tx in progress).
7572 */
7573static int mgsl_loopmode_send_done( struct mgsl_struct * info )
7574{
7575 unsigned long flags;
7576
7577 spin_lock_irqsave(&info->irq_spinlock,flags);
7578 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
7579 if (info->tx_active)
7580 info->loopmode_send_done_requested = true;
7581 else
7582 usc_loopmode_send_done(info);
7583 }
7584 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7585
7586 return 0;
7587}
7588
7589/* release the line by echoing RxD to TxD
7590 * upon completion of a transmit frame
7591 */
7592static void usc_loopmode_send_done( struct mgsl_struct * info )
7593{
7594 info->loopmode_send_done_requested = false;
7595 /* clear CMR:13 to 0 to start echoing RxData to TxData */
7596 info->cmr_value &= ~BIT13;
7597 usc_OutReg(info, CMR, info->cmr_value);
7598}
7599
7600/* abort a transmit in progress while in HDLC LoopMode
7601 */
7602static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
7603{
7604 /* reset tx dma channel and purge TxFifo */
7605 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7606 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
7607 usc_loopmode_send_done( info );
7608}
7609
7610/* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
7611 * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
7612 * we must clear CMR:13 to begin repeating TxData to RxData
7613 */
7614static void usc_loopmode_insert_request( struct mgsl_struct * info )
7615{
7616 info->loopmode_insert_requested = true;
7617
7618 /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
7619 * begin repeating TxData on RxData (complete insertion)
7620 */
7621 usc_OutReg( info, RICR,
7622 (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
7623
7624 /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
7625 info->cmr_value |= BIT13;
7626 usc_OutReg(info, CMR, info->cmr_value);
7627}
7628
7629/* return 1 if station is inserted into the loop, otherwise 0
7630 */
7631static int usc_loopmode_active( struct mgsl_struct * info)
7632{
7633 return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
7634}
7635
7636#if SYNCLINK_GENERIC_HDLC
7637
7638/**
7639 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
7640 * set encoding and frame check sequence (FCS) options
7641 *
7642 * dev pointer to network device structure
7643 * encoding serial encoding setting
7644 * parity FCS setting
7645 *
7646 * returns 0 if success, otherwise error code
7647 */
7648static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
7649 unsigned short parity)
7650{
7651 struct mgsl_struct *info = dev_to_port(dev);
7652 unsigned char new_encoding;
7653 unsigned short new_crctype;
7654
7655 /* return error if TTY interface open */
7656 if (info->port.count)
7657 return -EBUSY;
7658
7659 switch (encoding)
7660 {
7661 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
7662 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
7663 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
7664 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
7665 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
7666 default: return -EINVAL;
7667 }
7668
7669 switch (parity)
7670 {
7671 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
7672 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
7673 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
7674 default: return -EINVAL;
7675 }
7676
7677 info->params.encoding = new_encoding;
7678 info->params.crc_type = new_crctype;
7679
7680 /* if network interface up, reprogram hardware */
7681 if (info->netcount)
7682 mgsl_program_hw(info);
7683
7684 return 0;
7685}
7686
7687/**
7688 * called by generic HDLC layer to send frame
7689 *
7690 * skb socket buffer containing HDLC frame
7691 * dev pointer to network device structure
7692 */
7693static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
7694 struct net_device *dev)
7695{
7696 struct mgsl_struct *info = dev_to_port(dev);
7697 unsigned long flags;
7698
7699 if (debug_level >= DEBUG_LEVEL_INFO)
7700 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
7701
7702 /* stop sending until this frame completes */
7703 netif_stop_queue(dev);
7704
7705 /* copy data to device buffers */
7706 info->xmit_cnt = skb->len;
7707 mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
7708
7709 /* update network statistics */
7710 dev->stats.tx_packets++;
7711 dev->stats.tx_bytes += skb->len;
7712
7713 /* done with socket buffer, so free it */
7714 dev_kfree_skb(skb);
7715
7716 /* save start time for transmit timeout detection */
7717 dev->trans_start = jiffies;
7718
7719 /* start hardware transmitter if necessary */
7720 spin_lock_irqsave(&info->irq_spinlock,flags);
7721 if (!info->tx_active)
7722 usc_start_transmitter(info);
7723 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7724
7725 return NETDEV_TX_OK;
7726}
7727
7728/**
7729 * called by network layer when interface enabled
7730 * claim resources and initialize hardware
7731 *
7732 * dev pointer to network device structure
7733 *
7734 * returns 0 if success, otherwise error code
7735 */
7736static int hdlcdev_open(struct net_device *dev)
7737{
7738 struct mgsl_struct *info = dev_to_port(dev);
7739 int rc;
7740 unsigned long flags;
7741
7742 if (debug_level >= DEBUG_LEVEL_INFO)
7743 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
7744
7745 /* generic HDLC layer open processing */
7746 if ((rc = hdlc_open(dev)))
7747 return rc;
7748
7749 /* arbitrate between network and tty opens */
7750 spin_lock_irqsave(&info->netlock, flags);
7751 if (info->port.count != 0 || info->netcount != 0) {
7752 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
7753 spin_unlock_irqrestore(&info->netlock, flags);
7754 return -EBUSY;
7755 }
7756 info->netcount=1;
7757 spin_unlock_irqrestore(&info->netlock, flags);
7758
7759 /* claim resources and init adapter */
7760 if ((rc = startup(info)) != 0) {
7761 spin_lock_irqsave(&info->netlock, flags);
7762 info->netcount=0;
7763 spin_unlock_irqrestore(&info->netlock, flags);
7764 return rc;
7765 }
7766
7767 /* assert DTR and RTS, apply hardware settings */
7768 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
7769 mgsl_program_hw(info);
7770
7771 /* enable network layer transmit */
7772 dev->trans_start = jiffies;
7773 netif_start_queue(dev);
7774
7775 /* inform generic HDLC layer of current DCD status */
7776 spin_lock_irqsave(&info->irq_spinlock, flags);
7777 usc_get_serial_signals(info);
7778 spin_unlock_irqrestore(&info->irq_spinlock, flags);
7779 if (info->serial_signals & SerialSignal_DCD)
7780 netif_carrier_on(dev);
7781 else
7782 netif_carrier_off(dev);
7783 return 0;
7784}
7785
7786/**
7787 * called by network layer when interface is disabled
7788 * shutdown hardware and release resources
7789 *
7790 * dev pointer to network device structure
7791 *
7792 * returns 0 if success, otherwise error code
7793 */
7794static int hdlcdev_close(struct net_device *dev)
7795{
7796 struct mgsl_struct *info = dev_to_port(dev);
7797 unsigned long flags;
7798
7799 if (debug_level >= DEBUG_LEVEL_INFO)
7800 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
7801
7802 netif_stop_queue(dev);
7803
7804 /* shutdown adapter and release resources */
7805 shutdown(info);
7806
7807 hdlc_close(dev);
7808
7809 spin_lock_irqsave(&info->netlock, flags);
7810 info->netcount=0;
7811 spin_unlock_irqrestore(&info->netlock, flags);
7812
7813 return 0;
7814}
7815
7816/**
7817 * called by network layer to process IOCTL call to network device
7818 *
7819 * dev pointer to network device structure
7820 * ifr pointer to network interface request structure
7821 * cmd IOCTL command code
7822 *
7823 * returns 0 if success, otherwise error code
7824 */
7825static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
7826{
7827 const size_t size = sizeof(sync_serial_settings);
7828 sync_serial_settings new_line;
7829 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
7830 struct mgsl_struct *info = dev_to_port(dev);
7831 unsigned int flags;
7832
7833 if (debug_level >= DEBUG_LEVEL_INFO)
7834 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
7835
7836 /* return error if TTY interface open */
7837 if (info->port.count)
7838 return -EBUSY;
7839
7840 if (cmd != SIOCWANDEV)
7841 return hdlc_ioctl(dev, ifr, cmd);
7842
7843 switch(ifr->ifr_settings.type) {
7844 case IF_GET_IFACE: /* return current sync_serial_settings */
7845
7846 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
7847 if (ifr->ifr_settings.size < size) {
7848 ifr->ifr_settings.size = size; /* data size wanted */
7849 return -ENOBUFS;
7850 }
7851
7852 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7853 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7854 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7855 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7856
7857 switch (flags){
7858 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
7859 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
7860 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
7861 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
7862 default: new_line.clock_type = CLOCK_DEFAULT;
7863 }
7864
7865 new_line.clock_rate = info->params.clock_speed;
7866 new_line.loopback = info->params.loopback ? 1:0;
7867
7868 if (copy_to_user(line, &new_line, size))
7869 return -EFAULT;
7870 return 0;
7871
7872 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
7873
7874 if(!capable(CAP_NET_ADMIN))
7875 return -EPERM;
7876 if (copy_from_user(&new_line, line, size))
7877 return -EFAULT;
7878
7879 switch (new_line.clock_type)
7880 {
7881 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
7882 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
7883 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
7884 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
7885 case CLOCK_DEFAULT: flags = info->params.flags &
7886 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7887 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7888 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7889 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
7890 default: return -EINVAL;
7891 }
7892
7893 if (new_line.loopback != 0 && new_line.loopback != 1)
7894 return -EINVAL;
7895
7896 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7897 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7898 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7899 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7900 info->params.flags |= flags;
7901
7902 info->params.loopback = new_line.loopback;
7903
7904 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
7905 info->params.clock_speed = new_line.clock_rate;
7906 else
7907 info->params.clock_speed = 0;
7908
7909 /* if network interface up, reprogram hardware */
7910 if (info->netcount)
7911 mgsl_program_hw(info);
7912 return 0;
7913
7914 default:
7915 return hdlc_ioctl(dev, ifr, cmd);
7916 }
7917}
7918
7919/**
7920 * called by network layer when transmit timeout is detected
7921 *
7922 * dev pointer to network device structure
7923 */
7924static void hdlcdev_tx_timeout(struct net_device *dev)
7925{
7926 struct mgsl_struct *info = dev_to_port(dev);
7927 unsigned long flags;
7928
7929 if (debug_level >= DEBUG_LEVEL_INFO)
7930 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
7931
7932 dev->stats.tx_errors++;
7933 dev->stats.tx_aborted_errors++;
7934
7935 spin_lock_irqsave(&info->irq_spinlock,flags);
7936 usc_stop_transmitter(info);
7937 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7938
7939 netif_wake_queue(dev);
7940}
7941
7942/**
7943 * called by device driver when transmit completes
7944 * reenable network layer transmit if stopped
7945 *
7946 * info pointer to device instance information
7947 */
7948static void hdlcdev_tx_done(struct mgsl_struct *info)
7949{
7950 if (netif_queue_stopped(info->netdev))
7951 netif_wake_queue(info->netdev);
7952}
7953
7954/**
7955 * called by device driver when frame received
7956 * pass frame to network layer
7957 *
7958 * info pointer to device instance information
7959 * buf pointer to buffer contianing frame data
7960 * size count of data bytes in buf
7961 */
7962static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
7963{
7964 struct sk_buff *skb = dev_alloc_skb(size);
7965 struct net_device *dev = info->netdev;
7966
7967 if (debug_level >= DEBUG_LEVEL_INFO)
7968 printk("hdlcdev_rx(%s)\n", dev->name);
7969
7970 if (skb == NULL) {
7971 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
7972 dev->name);
7973 dev->stats.rx_dropped++;
7974 return;
7975 }
7976
7977 memcpy(skb_put(skb, size), buf, size);
7978
7979 skb->protocol = hdlc_type_trans(skb, dev);
7980
7981 dev->stats.rx_packets++;
7982 dev->stats.rx_bytes += size;
7983
7984 netif_rx(skb);
7985}
7986
7987static const struct net_device_ops hdlcdev_ops = {
7988 .ndo_open = hdlcdev_open,
7989 .ndo_stop = hdlcdev_close,
7990 .ndo_change_mtu = hdlc_change_mtu,
7991 .ndo_start_xmit = hdlc_start_xmit,
7992 .ndo_do_ioctl = hdlcdev_ioctl,
7993 .ndo_tx_timeout = hdlcdev_tx_timeout,
7994};
7995
7996/**
7997 * called by device driver when adding device instance
7998 * do generic HDLC initialization
7999 *
8000 * info pointer to device instance information
8001 *
8002 * returns 0 if success, otherwise error code
8003 */
8004static int hdlcdev_init(struct mgsl_struct *info)
8005{
8006 int rc;
8007 struct net_device *dev;
8008 hdlc_device *hdlc;
8009
8010 /* allocate and initialize network and HDLC layer objects */
8011
8012 if (!(dev = alloc_hdlcdev(info))) {
8013 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
8014 return -ENOMEM;
8015 }
8016
8017 /* for network layer reporting purposes only */
8018 dev->base_addr = info->io_base;
8019 dev->irq = info->irq_level;
8020 dev->dma = info->dma_level;
8021
8022 /* network layer callbacks and settings */
8023 dev->netdev_ops = &hdlcdev_ops;
8024 dev->watchdog_timeo = 10 * HZ;
8025 dev->tx_queue_len = 50;
8026
8027 /* generic HDLC layer callbacks and settings */
8028 hdlc = dev_to_hdlc(dev);
8029 hdlc->attach = hdlcdev_attach;
8030 hdlc->xmit = hdlcdev_xmit;
8031
8032 /* register objects with HDLC layer */
8033 if ((rc = register_hdlc_device(dev))) {
8034 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
8035 free_netdev(dev);
8036 return rc;
8037 }
8038
8039 info->netdev = dev;
8040 return 0;
8041}
8042
8043/**
8044 * called by device driver when removing device instance
8045 * do generic HDLC cleanup
8046 *
8047 * info pointer to device instance information
8048 */
8049static void hdlcdev_exit(struct mgsl_struct *info)
8050{
8051 unregister_hdlc_device(info->netdev);
8052 free_netdev(info->netdev);
8053 info->netdev = NULL;
8054}
8055
8056#endif /* CONFIG_HDLC */
8057
8058
8059static int __devinit synclink_init_one (struct pci_dev *dev,
8060 const struct pci_device_id *ent)
8061{
8062 struct mgsl_struct *info;
8063
8064 if (pci_enable_device(dev)) {
8065 printk("error enabling pci device %p\n", dev);
8066 return -EIO;
8067 }
8068
8069 if (!(info = mgsl_allocate_device())) {
8070 printk("can't allocate device instance data.\n");
8071 return -EIO;
8072 }
8073
8074 /* Copy user configuration info to device instance data */
8075
8076 info->io_base = pci_resource_start(dev, 2);
8077 info->irq_level = dev->irq;
8078 info->phys_memory_base = pci_resource_start(dev, 3);
8079
8080 /* Because veremap only works on page boundaries we must map
8081 * a larger area than is actually implemented for the LCR
8082 * memory range. We map a full page starting at the page boundary.
8083 */
8084 info->phys_lcr_base = pci_resource_start(dev, 0);
8085 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
8086 info->phys_lcr_base &= ~(PAGE_SIZE-1);
8087
8088 info->bus_type = MGSL_BUS_TYPE_PCI;
8089 info->io_addr_size = 8;
8090 info->irq_flags = IRQF_SHARED;
8091
8092 if (dev->device == 0x0210) {
8093 /* Version 1 PCI9030 based universal PCI adapter */
8094 info->misc_ctrl_value = 0x007c4080;
8095 info->hw_version = 1;
8096 } else {
8097 /* Version 0 PCI9050 based 5V PCI adapter
8098 * A PCI9050 bug prevents reading LCR registers if
8099 * LCR base address bit 7 is set. Maintain shadow
8100 * value so we can write to LCR misc control reg.
8101 */
8102 info->misc_ctrl_value = 0x087e4546;
8103 info->hw_version = 0;
8104 }
8105
8106 mgsl_add_device(info);
8107
8108 return 0;
8109}
8110
8111static void __devexit synclink_remove_one (struct pci_dev *dev)
8112{
8113}
8114