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1/*
2 * Device driver for Microgate SyncLink GT serial adapters.
3 *
4 * written by Paul Fulghum for Microgate Corporation
5 * paulkf@microgate.com
6 *
7 * Microgate and SyncLink are trademarks of Microgate Corporation
8 *
9 * This code is released under the GNU General Public License (GPL)
10 *
11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
12 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
13 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
14 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
15 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
16 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
17 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
18 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
19 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
20 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
21 * OF THE POSSIBILITY OF SUCH DAMAGE.
22 */
23
24/*
25 * DEBUG OUTPUT DEFINITIONS
26 *
27 * uncomment lines below to enable specific types of debug output
28 *
29 * DBGINFO information - most verbose output
30 * DBGERR serious errors
31 * DBGBH bottom half service routine debugging
32 * DBGISR interrupt service routine debugging
33 * DBGDATA output receive and transmit data
34 * DBGTBUF output transmit DMA buffers and registers
35 * DBGRBUF output receive DMA buffers and registers
36 */
37
38#define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
39#define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
40#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
41#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
42#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
43/*#define DBGTBUF(info) dump_tbufs(info)*/
44/*#define DBGRBUF(info) dump_rbufs(info)*/
45
46
47#include <linux/module.h>
48#include <linux/errno.h>
49#include <linux/signal.h>
50#include <linux/sched.h>
51#include <linux/timer.h>
52#include <linux/interrupt.h>
53#include <linux/pci.h>
54#include <linux/tty.h>
55#include <linux/tty_flip.h>
56#include <linux/serial.h>
57#include <linux/major.h>
58#include <linux/string.h>
59#include <linux/fcntl.h>
60#include <linux/ptrace.h>
61#include <linux/ioport.h>
62#include <linux/mm.h>
63#include <linux/seq_file.h>
64#include <linux/slab.h>
65#include <linux/netdevice.h>
66#include <linux/vmalloc.h>
67#include <linux/init.h>
68#include <linux/delay.h>
69#include <linux/ioctl.h>
70#include <linux/termios.h>
71#include <linux/bitops.h>
72#include <linux/workqueue.h>
73#include <linux/hdlc.h>
74#include <linux/synclink.h>
75
76#include <asm/system.h>
77#include <asm/io.h>
78#include <asm/irq.h>
79#include <asm/dma.h>
80#include <asm/types.h>
81#include <asm/uaccess.h>
82
83#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
84#define SYNCLINK_GENERIC_HDLC 1
85#else
86#define SYNCLINK_GENERIC_HDLC 0
87#endif
88
89/*
90 * module identification
91 */
92static char *driver_name = "SyncLink GT";
93static char *tty_driver_name = "synclink_gt";
94static char *tty_dev_prefix = "ttySLG";
95MODULE_LICENSE("GPL");
96#define MGSL_MAGIC 0x5401
97#define MAX_DEVICES 32
98
99static struct pci_device_id pci_table[] = {
100 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
101 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
102 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
103 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
104 {0,}, /* terminate list */
105};
106MODULE_DEVICE_TABLE(pci, pci_table);
107
108static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
109static void remove_one(struct pci_dev *dev);
110static struct pci_driver pci_driver = {
111 .name = "synclink_gt",
112 .id_table = pci_table,
113 .probe = init_one,
114 .remove = __devexit_p(remove_one),
115};
116
117static bool pci_registered;
118
119/*
120 * module configuration and status
121 */
122static struct slgt_info *slgt_device_list;
123static int slgt_device_count;
124
125static int ttymajor;
126static int debug_level;
127static int maxframe[MAX_DEVICES];
128
129module_param(ttymajor, int, 0);
130module_param(debug_level, int, 0);
131module_param_array(maxframe, int, NULL, 0);
132
133MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
134MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
135MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
136
137/*
138 * tty support and callbacks
139 */
140static struct tty_driver *serial_driver;
141
142static int open(struct tty_struct *tty, struct file * filp);
143static void close(struct tty_struct *tty, struct file * filp);
144static void hangup(struct tty_struct *tty);
145static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
146
147static int write(struct tty_struct *tty, const unsigned char *buf, int count);
148static int put_char(struct tty_struct *tty, unsigned char ch);
149static void send_xchar(struct tty_struct *tty, char ch);
150static void wait_until_sent(struct tty_struct *tty, int timeout);
151static int write_room(struct tty_struct *tty);
152static void flush_chars(struct tty_struct *tty);
153static void flush_buffer(struct tty_struct *tty);
154static void tx_hold(struct tty_struct *tty);
155static void tx_release(struct tty_struct *tty);
156
157static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
158static int chars_in_buffer(struct tty_struct *tty);
159static void throttle(struct tty_struct * tty);
160static void unthrottle(struct tty_struct * tty);
161static int set_break(struct tty_struct *tty, int break_state);
162
163/*
164 * generic HDLC support and callbacks
165 */
166#if SYNCLINK_GENERIC_HDLC
167#define dev_to_port(D) (dev_to_hdlc(D)->priv)
168static void hdlcdev_tx_done(struct slgt_info *info);
169static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
170static int hdlcdev_init(struct slgt_info *info);
171static void hdlcdev_exit(struct slgt_info *info);
172#endif
173
174
175/*
176 * device specific structures, macros and functions
177 */
178
179#define SLGT_MAX_PORTS 4
180#define SLGT_REG_SIZE 256
181
182/*
183 * conditional wait facility
184 */
185struct cond_wait {
186 struct cond_wait *next;
187 wait_queue_head_t q;
188 wait_queue_t wait;
189 unsigned int data;
190};
191static void init_cond_wait(struct cond_wait *w, unsigned int data);
192static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
193static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
194static void flush_cond_wait(struct cond_wait **head);
195
196/*
197 * DMA buffer descriptor and access macros
198 */
199struct slgt_desc
200{
201 __le16 count;
202 __le16 status;
203 __le32 pbuf; /* physical address of data buffer */
204 __le32 next; /* physical address of next descriptor */
205
206 /* driver book keeping */
207 char *buf; /* virtual address of data buffer */
208 unsigned int pdesc; /* physical address of this descriptor */
209 dma_addr_t buf_dma_addr;
210 unsigned short buf_count;
211};
212
213#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
214#define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
215#define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
216#define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
217#define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
218#define desc_count(a) (le16_to_cpu((a).count))
219#define desc_status(a) (le16_to_cpu((a).status))
220#define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
221#define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
222#define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
223#define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
224#define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
225
226struct _input_signal_events {
227 int ri_up;
228 int ri_down;
229 int dsr_up;
230 int dsr_down;
231 int dcd_up;
232 int dcd_down;
233 int cts_up;
234 int cts_down;
235};
236
237/*
238 * device instance data structure
239 */
240struct slgt_info {
241 void *if_ptr; /* General purpose pointer (used by SPPP) */
242 struct tty_port port;
243
244 struct slgt_info *next_device; /* device list link */
245
246 int magic;
247
248 char device_name[25];
249 struct pci_dev *pdev;
250
251 int port_count; /* count of ports on adapter */
252 int adapter_num; /* adapter instance number */
253 int port_num; /* port instance number */
254
255 /* array of pointers to port contexts on this adapter */
256 struct slgt_info *port_array[SLGT_MAX_PORTS];
257
258 int line; /* tty line instance number */
259
260 struct mgsl_icount icount;
261
262 int timeout;
263 int x_char; /* xon/xoff character */
264 unsigned int read_status_mask;
265 unsigned int ignore_status_mask;
266
267 wait_queue_head_t status_event_wait_q;
268 wait_queue_head_t event_wait_q;
269 struct timer_list tx_timer;
270 struct timer_list rx_timer;
271
272 unsigned int gpio_present;
273 struct cond_wait *gpio_wait_q;
274
275 spinlock_t lock; /* spinlock for synchronizing with ISR */
276
277 struct work_struct task;
278 u32 pending_bh;
279 bool bh_requested;
280 bool bh_running;
281
282 int isr_overflow;
283 bool irq_requested; /* true if IRQ requested */
284 bool irq_occurred; /* for diagnostics use */
285
286 /* device configuration */
287
288 unsigned int bus_type;
289 unsigned int irq_level;
290 unsigned long irq_flags;
291
292 unsigned char __iomem * reg_addr; /* memory mapped registers address */
293 u32 phys_reg_addr;
294 bool reg_addr_requested;
295
296 MGSL_PARAMS params; /* communications parameters */
297 u32 idle_mode;
298 u32 max_frame_size; /* as set by device config */
299
300 unsigned int rbuf_fill_level;
301 unsigned int rx_pio;
302 unsigned int if_mode;
303 unsigned int base_clock;
304 unsigned int xsync;
305 unsigned int xctrl;
306
307 /* device status */
308
309 bool rx_enabled;
310 bool rx_restart;
311
312 bool tx_enabled;
313 bool tx_active;
314
315 unsigned char signals; /* serial signal states */
316 int init_error; /* initialization error */
317
318 unsigned char *tx_buf;
319 int tx_count;
320
321 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
322 char char_buf[MAX_ASYNC_BUFFER_SIZE];
323 bool drop_rts_on_tx_done;
324 struct _input_signal_events input_signal_events;
325
326 int dcd_chkcount; /* check counts to prevent */
327 int cts_chkcount; /* too many IRQs if a signal */
328 int dsr_chkcount; /* is floating */
329 int ri_chkcount;
330
331 char *bufs; /* virtual address of DMA buffer lists */
332 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
333
334 unsigned int rbuf_count;
335 struct slgt_desc *rbufs;
336 unsigned int rbuf_current;
337 unsigned int rbuf_index;
338 unsigned int rbuf_fill_index;
339 unsigned short rbuf_fill_count;
340
341 unsigned int tbuf_count;
342 struct slgt_desc *tbufs;
343 unsigned int tbuf_current;
344 unsigned int tbuf_start;
345
346 unsigned char *tmp_rbuf;
347 unsigned int tmp_rbuf_count;
348
349 /* SPPP/Cisco HDLC device parts */
350
351 int netcount;
352 spinlock_t netlock;
353#if SYNCLINK_GENERIC_HDLC
354 struct net_device *netdev;
355#endif
356
357};
358
359static MGSL_PARAMS default_params = {
360 .mode = MGSL_MODE_HDLC,
361 .loopback = 0,
362 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
363 .encoding = HDLC_ENCODING_NRZI_SPACE,
364 .clock_speed = 0,
365 .addr_filter = 0xff,
366 .crc_type = HDLC_CRC_16_CCITT,
367 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
368 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
369 .data_rate = 9600,
370 .data_bits = 8,
371 .stop_bits = 1,
372 .parity = ASYNC_PARITY_NONE
373};
374
375
376#define BH_RECEIVE 1
377#define BH_TRANSMIT 2
378#define BH_STATUS 4
379#define IO_PIN_SHUTDOWN_LIMIT 100
380
381#define DMABUFSIZE 256
382#define DESC_LIST_SIZE 4096
383
384#define MASK_PARITY BIT1
385#define MASK_FRAMING BIT0
386#define MASK_BREAK BIT14
387#define MASK_OVERRUN BIT4
388
389#define GSR 0x00 /* global status */
390#define JCR 0x04 /* JTAG control */
391#define IODR 0x08 /* GPIO direction */
392#define IOER 0x0c /* GPIO interrupt enable */
393#define IOVR 0x10 /* GPIO value */
394#define IOSR 0x14 /* GPIO interrupt status */
395#define TDR 0x80 /* tx data */
396#define RDR 0x80 /* rx data */
397#define TCR 0x82 /* tx control */
398#define TIR 0x84 /* tx idle */
399#define TPR 0x85 /* tx preamble */
400#define RCR 0x86 /* rx control */
401#define VCR 0x88 /* V.24 control */
402#define CCR 0x89 /* clock control */
403#define BDR 0x8a /* baud divisor */
404#define SCR 0x8c /* serial control */
405#define SSR 0x8e /* serial status */
406#define RDCSR 0x90 /* rx DMA control/status */
407#define TDCSR 0x94 /* tx DMA control/status */
408#define RDDAR 0x98 /* rx DMA descriptor address */
409#define TDDAR 0x9c /* tx DMA descriptor address */
410#define XSR 0x40 /* extended sync pattern */
411#define XCR 0x44 /* extended control */
412
413#define RXIDLE BIT14
414#define RXBREAK BIT14
415#define IRQ_TXDATA BIT13
416#define IRQ_TXIDLE BIT12
417#define IRQ_TXUNDER BIT11 /* HDLC */
418#define IRQ_RXDATA BIT10
419#define IRQ_RXIDLE BIT9 /* HDLC */
420#define IRQ_RXBREAK BIT9 /* async */
421#define IRQ_RXOVER BIT8
422#define IRQ_DSR BIT7
423#define IRQ_CTS BIT6
424#define IRQ_DCD BIT5
425#define IRQ_RI BIT4
426#define IRQ_ALL 0x3ff0
427#define IRQ_MASTER BIT0
428
429#define slgt_irq_on(info, mask) \
430 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
431#define slgt_irq_off(info, mask) \
432 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
433
434static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
435static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
436static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
437static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
438static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
439static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
440
441static void msc_set_vcr(struct slgt_info *info);
442
443static int startup(struct slgt_info *info);
444static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
445static void shutdown(struct slgt_info *info);
446static void program_hw(struct slgt_info *info);
447static void change_params(struct slgt_info *info);
448
449static int register_test(struct slgt_info *info);
450static int irq_test(struct slgt_info *info);
451static int loopback_test(struct slgt_info *info);
452static int adapter_test(struct slgt_info *info);
453
454static void reset_adapter(struct slgt_info *info);
455static void reset_port(struct slgt_info *info);
456static void async_mode(struct slgt_info *info);
457static void sync_mode(struct slgt_info *info);
458
459static void rx_stop(struct slgt_info *info);
460static void rx_start(struct slgt_info *info);
461static void reset_rbufs(struct slgt_info *info);
462static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
463static void rdma_reset(struct slgt_info *info);
464static bool rx_get_frame(struct slgt_info *info);
465static bool rx_get_buf(struct slgt_info *info);
466
467static void tx_start(struct slgt_info *info);
468static void tx_stop(struct slgt_info *info);
469static void tx_set_idle(struct slgt_info *info);
470static unsigned int free_tbuf_count(struct slgt_info *info);
471static unsigned int tbuf_bytes(struct slgt_info *info);
472static void reset_tbufs(struct slgt_info *info);
473static void tdma_reset(struct slgt_info *info);
474static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
475
476static void get_signals(struct slgt_info *info);
477static void set_signals(struct slgt_info *info);
478static void enable_loopback(struct slgt_info *info);
479static void set_rate(struct slgt_info *info, u32 data_rate);
480
481static int bh_action(struct slgt_info *info);
482static void bh_handler(struct work_struct *work);
483static void bh_transmit(struct slgt_info *info);
484static void isr_serial(struct slgt_info *info);
485static void isr_rdma(struct slgt_info *info);
486static void isr_txeom(struct slgt_info *info, unsigned short status);
487static void isr_tdma(struct slgt_info *info);
488
489static int alloc_dma_bufs(struct slgt_info *info);
490static void free_dma_bufs(struct slgt_info *info);
491static int alloc_desc(struct slgt_info *info);
492static void free_desc(struct slgt_info *info);
493static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
494static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
495
496static int alloc_tmp_rbuf(struct slgt_info *info);
497static void free_tmp_rbuf(struct slgt_info *info);
498
499static void tx_timeout(unsigned long context);
500static void rx_timeout(unsigned long context);
501
502/*
503 * ioctl handlers
504 */
505static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
506static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
507static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
508static int get_txidle(struct slgt_info *info, int __user *idle_mode);
509static int set_txidle(struct slgt_info *info, int idle_mode);
510static int tx_enable(struct slgt_info *info, int enable);
511static int tx_abort(struct slgt_info *info);
512static int rx_enable(struct slgt_info *info, int enable);
513static int modem_input_wait(struct slgt_info *info,int arg);
514static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
515static int tiocmget(struct tty_struct *tty);
516static int tiocmset(struct tty_struct *tty,
517 unsigned int set, unsigned int clear);
518static int set_break(struct tty_struct *tty, int break_state);
519static int get_interface(struct slgt_info *info, int __user *if_mode);
520static int set_interface(struct slgt_info *info, int if_mode);
521static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
522static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
523static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
524static int get_xsync(struct slgt_info *info, int __user *if_mode);
525static int set_xsync(struct slgt_info *info, int if_mode);
526static int get_xctrl(struct slgt_info *info, int __user *if_mode);
527static int set_xctrl(struct slgt_info *info, int if_mode);
528
529/*
530 * driver functions
531 */
532static void add_device(struct slgt_info *info);
533static void device_init(int adapter_num, struct pci_dev *pdev);
534static int claim_resources(struct slgt_info *info);
535static void release_resources(struct slgt_info *info);
536
537/*
538 * DEBUG OUTPUT CODE
539 */
540#ifndef DBGINFO
541#define DBGINFO(fmt)
542#endif
543#ifndef DBGERR
544#define DBGERR(fmt)
545#endif
546#ifndef DBGBH
547#define DBGBH(fmt)
548#endif
549#ifndef DBGISR
550#define DBGISR(fmt)
551#endif
552
553#ifdef DBGDATA
554static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
555{
556 int i;
557 int linecount;
558 printk("%s %s data:\n",info->device_name, label);
559 while(count) {
560 linecount = (count > 16) ? 16 : count;
561 for(i=0; i < linecount; i++)
562 printk("%02X ",(unsigned char)data[i]);
563 for(;i<17;i++)
564 printk(" ");
565 for(i=0;i<linecount;i++) {
566 if (data[i]>=040 && data[i]<=0176)
567 printk("%c",data[i]);
568 else
569 printk(".");
570 }
571 printk("\n");
572 data += linecount;
573 count -= linecount;
574 }
575}
576#else
577#define DBGDATA(info, buf, size, label)
578#endif
579
580#ifdef DBGTBUF
581static void dump_tbufs(struct slgt_info *info)
582{
583 int i;
584 printk("tbuf_current=%d\n", info->tbuf_current);
585 for (i=0 ; i < info->tbuf_count ; i++) {
586 printk("%d: count=%04X status=%04X\n",
587 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
588 }
589}
590#else
591#define DBGTBUF(info)
592#endif
593
594#ifdef DBGRBUF
595static void dump_rbufs(struct slgt_info *info)
596{
597 int i;
598 printk("rbuf_current=%d\n", info->rbuf_current);
599 for (i=0 ; i < info->rbuf_count ; i++) {
600 printk("%d: count=%04X status=%04X\n",
601 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
602 }
603}
604#else
605#define DBGRBUF(info)
606#endif
607
608static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
609{
610#ifdef SANITY_CHECK
611 if (!info) {
612 printk("null struct slgt_info for (%s) in %s\n", devname, name);
613 return 1;
614 }
615 if (info->magic != MGSL_MAGIC) {
616 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
617 return 1;
618 }
619#else
620 if (!info)
621 return 1;
622#endif
623 return 0;
624}
625
626/**
627 * line discipline callback wrappers
628 *
629 * The wrappers maintain line discipline references
630 * while calling into the line discipline.
631 *
632 * ldisc_receive_buf - pass receive data to line discipline
633 */
634static void ldisc_receive_buf(struct tty_struct *tty,
635 const __u8 *data, char *flags, int count)
636{
637 struct tty_ldisc *ld;
638 if (!tty)
639 return;
640 ld = tty_ldisc_ref(tty);
641 if (ld) {
642 if (ld->ops->receive_buf)
643 ld->ops->receive_buf(tty, data, flags, count);
644 tty_ldisc_deref(ld);
645 }
646}
647
648/* tty callbacks */
649
650static int open(struct tty_struct *tty, struct file *filp)
651{
652 struct slgt_info *info;
653 int retval, line;
654 unsigned long flags;
655
656 line = tty->index;
657 if ((line < 0) || (line >= slgt_device_count)) {
658 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
659 return -ENODEV;
660 }
661
662 info = slgt_device_list;
663 while(info && info->line != line)
664 info = info->next_device;
665 if (sanity_check(info, tty->name, "open"))
666 return -ENODEV;
667 if (info->init_error) {
668 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
669 return -ENODEV;
670 }
671
672 tty->driver_data = info;
673 info->port.tty = tty;
674
675 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
676
677 /* If port is closing, signal caller to try again */
678 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
679 if (info->port.flags & ASYNC_CLOSING)
680 interruptible_sleep_on(&info->port.close_wait);
681 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
682 -EAGAIN : -ERESTARTSYS);
683 goto cleanup;
684 }
685
686 mutex_lock(&info->port.mutex);
687 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
688
689 spin_lock_irqsave(&info->netlock, flags);
690 if (info->netcount) {
691 retval = -EBUSY;
692 spin_unlock_irqrestore(&info->netlock, flags);
693 mutex_unlock(&info->port.mutex);
694 goto cleanup;
695 }
696 info->port.count++;
697 spin_unlock_irqrestore(&info->netlock, flags);
698
699 if (info->port.count == 1) {
700 /* 1st open on this device, init hardware */
701 retval = startup(info);
702 if (retval < 0) {
703 mutex_unlock(&info->port.mutex);
704 goto cleanup;
705 }
706 }
707 mutex_unlock(&info->port.mutex);
708 retval = block_til_ready(tty, filp, info);
709 if (retval) {
710 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
711 goto cleanup;
712 }
713
714 retval = 0;
715
716cleanup:
717 if (retval) {
718 if (tty->count == 1)
719 info->port.tty = NULL; /* tty layer will release tty struct */
720 if(info->port.count)
721 info->port.count--;
722 }
723
724 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
725 return retval;
726}
727
728static void close(struct tty_struct *tty, struct file *filp)
729{
730 struct slgt_info *info = tty->driver_data;
731
732 if (sanity_check(info, tty->name, "close"))
733 return;
734 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
735
736 if (tty_port_close_start(&info->port, tty, filp) == 0)
737 goto cleanup;
738
739 mutex_lock(&info->port.mutex);
740 if (info->port.flags & ASYNC_INITIALIZED)
741 wait_until_sent(tty, info->timeout);
742 flush_buffer(tty);
743 tty_ldisc_flush(tty);
744
745 shutdown(info);
746 mutex_unlock(&info->port.mutex);
747
748 tty_port_close_end(&info->port, tty);
749 info->port.tty = NULL;
750cleanup:
751 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
752}
753
754static void hangup(struct tty_struct *tty)
755{
756 struct slgt_info *info = tty->driver_data;
757 unsigned long flags;
758
759 if (sanity_check(info, tty->name, "hangup"))
760 return;
761 DBGINFO(("%s hangup\n", info->device_name));
762
763 flush_buffer(tty);
764
765 mutex_lock(&info->port.mutex);
766 shutdown(info);
767
768 spin_lock_irqsave(&info->port.lock, flags);
769 info->port.count = 0;
770 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
771 info->port.tty = NULL;
772 spin_unlock_irqrestore(&info->port.lock, flags);
773 mutex_unlock(&info->port.mutex);
774
775 wake_up_interruptible(&info->port.open_wait);
776}
777
778static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
779{
780 struct slgt_info *info = tty->driver_data;
781 unsigned long flags;
782
783 DBGINFO(("%s set_termios\n", tty->driver->name));
784
785 change_params(info);
786
787 /* Handle transition to B0 status */
788 if (old_termios->c_cflag & CBAUD &&
789 !(tty->termios->c_cflag & CBAUD)) {
790 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
791 spin_lock_irqsave(&info->lock,flags);
792 set_signals(info);
793 spin_unlock_irqrestore(&info->lock,flags);
794 }
795
796 /* Handle transition away from B0 status */
797 if (!(old_termios->c_cflag & CBAUD) &&
798 tty->termios->c_cflag & CBAUD) {
799 info->signals |= SerialSignal_DTR;
800 if (!(tty->termios->c_cflag & CRTSCTS) ||
801 !test_bit(TTY_THROTTLED, &tty->flags)) {
802 info->signals |= SerialSignal_RTS;
803 }
804 spin_lock_irqsave(&info->lock,flags);
805 set_signals(info);
806 spin_unlock_irqrestore(&info->lock,flags);
807 }
808
809 /* Handle turning off CRTSCTS */
810 if (old_termios->c_cflag & CRTSCTS &&
811 !(tty->termios->c_cflag & CRTSCTS)) {
812 tty->hw_stopped = 0;
813 tx_release(tty);
814 }
815}
816
817static void update_tx_timer(struct slgt_info *info)
818{
819 /*
820 * use worst case speed of 1200bps to calculate transmit timeout
821 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
822 */
823 if (info->params.mode == MGSL_MODE_HDLC) {
824 int timeout = (tbuf_bytes(info) * 7) + 1000;
825 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
826 }
827}
828
829static int write(struct tty_struct *tty,
830 const unsigned char *buf, int count)
831{
832 int ret = 0;
833 struct slgt_info *info = tty->driver_data;
834 unsigned long flags;
835
836 if (sanity_check(info, tty->name, "write"))
837 return -EIO;
838
839 DBGINFO(("%s write count=%d\n", info->device_name, count));
840
841 if (!info->tx_buf || (count > info->max_frame_size))
842 return -EIO;
843
844 if (!count || tty->stopped || tty->hw_stopped)
845 return 0;
846
847 spin_lock_irqsave(&info->lock, flags);
848
849 if (info->tx_count) {
850 /* send accumulated data from send_char() */
851 if (!tx_load(info, info->tx_buf, info->tx_count))
852 goto cleanup;
853 info->tx_count = 0;
854 }
855
856 if (tx_load(info, buf, count))
857 ret = count;
858
859cleanup:
860 spin_unlock_irqrestore(&info->lock, flags);
861 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
862 return ret;
863}
864
865static int put_char(struct tty_struct *tty, unsigned char ch)
866{
867 struct slgt_info *info = tty->driver_data;
868 unsigned long flags;
869 int ret = 0;
870
871 if (sanity_check(info, tty->name, "put_char"))
872 return 0;
873 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
874 if (!info->tx_buf)
875 return 0;
876 spin_lock_irqsave(&info->lock,flags);
877 if (info->tx_count < info->max_frame_size) {
878 info->tx_buf[info->tx_count++] = ch;
879 ret = 1;
880 }
881 spin_unlock_irqrestore(&info->lock,flags);
882 return ret;
883}
884
885static void send_xchar(struct tty_struct *tty, char ch)
886{
887 struct slgt_info *info = tty->driver_data;
888 unsigned long flags;
889
890 if (sanity_check(info, tty->name, "send_xchar"))
891 return;
892 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
893 info->x_char = ch;
894 if (ch) {
895 spin_lock_irqsave(&info->lock,flags);
896 if (!info->tx_enabled)
897 tx_start(info);
898 spin_unlock_irqrestore(&info->lock,flags);
899 }
900}
901
902static void wait_until_sent(struct tty_struct *tty, int timeout)
903{
904 struct slgt_info *info = tty->driver_data;
905 unsigned long orig_jiffies, char_time;
906
907 if (!info )
908 return;
909 if (sanity_check(info, tty->name, "wait_until_sent"))
910 return;
911 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
912 if (!(info->port.flags & ASYNC_INITIALIZED))
913 goto exit;
914
915 orig_jiffies = jiffies;
916
917 /* Set check interval to 1/5 of estimated time to
918 * send a character, and make it at least 1. The check
919 * interval should also be less than the timeout.
920 * Note: use tight timings here to satisfy the NIST-PCTS.
921 */
922
923 if (info->params.data_rate) {
924 char_time = info->timeout/(32 * 5);
925 if (!char_time)
926 char_time++;
927 } else
928 char_time = 1;
929
930 if (timeout)
931 char_time = min_t(unsigned long, char_time, timeout);
932
933 while (info->tx_active) {
934 msleep_interruptible(jiffies_to_msecs(char_time));
935 if (signal_pending(current))
936 break;
937 if (timeout && time_after(jiffies, orig_jiffies + timeout))
938 break;
939 }
940exit:
941 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
942}
943
944static int write_room(struct tty_struct *tty)
945{
946 struct slgt_info *info = tty->driver_data;
947 int ret;
948
949 if (sanity_check(info, tty->name, "write_room"))
950 return 0;
951 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
952 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
953 return ret;
954}
955
956static void flush_chars(struct tty_struct *tty)
957{
958 struct slgt_info *info = tty->driver_data;
959 unsigned long flags;
960
961 if (sanity_check(info, tty->name, "flush_chars"))
962 return;
963 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
964
965 if (info->tx_count <= 0 || tty->stopped ||
966 tty->hw_stopped || !info->tx_buf)
967 return;
968
969 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
970
971 spin_lock_irqsave(&info->lock,flags);
972 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
973 info->tx_count = 0;
974 spin_unlock_irqrestore(&info->lock,flags);
975}
976
977static void flush_buffer(struct tty_struct *tty)
978{
979 struct slgt_info *info = tty->driver_data;
980 unsigned long flags;
981
982 if (sanity_check(info, tty->name, "flush_buffer"))
983 return;
984 DBGINFO(("%s flush_buffer\n", info->device_name));
985
986 spin_lock_irqsave(&info->lock, flags);
987 info->tx_count = 0;
988 spin_unlock_irqrestore(&info->lock, flags);
989
990 tty_wakeup(tty);
991}
992
993/*
994 * throttle (stop) transmitter
995 */
996static void tx_hold(struct tty_struct *tty)
997{
998 struct slgt_info *info = tty->driver_data;
999 unsigned long flags;
1000
1001 if (sanity_check(info, tty->name, "tx_hold"))
1002 return;
1003 DBGINFO(("%s tx_hold\n", info->device_name));
1004 spin_lock_irqsave(&info->lock,flags);
1005 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1006 tx_stop(info);
1007 spin_unlock_irqrestore(&info->lock,flags);
1008}
1009
1010/*
1011 * release (start) transmitter
1012 */
1013static void tx_release(struct tty_struct *tty)
1014{
1015 struct slgt_info *info = tty->driver_data;
1016 unsigned long flags;
1017
1018 if (sanity_check(info, tty->name, "tx_release"))
1019 return;
1020 DBGINFO(("%s tx_release\n", info->device_name));
1021 spin_lock_irqsave(&info->lock, flags);
1022 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
1023 info->tx_count = 0;
1024 spin_unlock_irqrestore(&info->lock, flags);
1025}
1026
1027/*
1028 * Service an IOCTL request
1029 *
1030 * Arguments
1031 *
1032 * tty pointer to tty instance data
1033 * cmd IOCTL command code
1034 * arg command argument/context
1035 *
1036 * Return 0 if success, otherwise error code
1037 */
1038static int ioctl(struct tty_struct *tty,
1039 unsigned int cmd, unsigned long arg)
1040{
1041 struct slgt_info *info = tty->driver_data;
1042 void __user *argp = (void __user *)arg;
1043 int ret;
1044
1045 if (sanity_check(info, tty->name, "ioctl"))
1046 return -ENODEV;
1047 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1048
1049 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1050 (cmd != TIOCMIWAIT)) {
1051 if (tty->flags & (1 << TTY_IO_ERROR))
1052 return -EIO;
1053 }
1054
1055 switch (cmd) {
1056 case MGSL_IOCWAITEVENT:
1057 return wait_mgsl_event(info, argp);
1058 case TIOCMIWAIT:
1059 return modem_input_wait(info,(int)arg);
1060 case MGSL_IOCSGPIO:
1061 return set_gpio(info, argp);
1062 case MGSL_IOCGGPIO:
1063 return get_gpio(info, argp);
1064 case MGSL_IOCWAITGPIO:
1065 return wait_gpio(info, argp);
1066 case MGSL_IOCGXSYNC:
1067 return get_xsync(info, argp);
1068 case MGSL_IOCSXSYNC:
1069 return set_xsync(info, (int)arg);
1070 case MGSL_IOCGXCTRL:
1071 return get_xctrl(info, argp);
1072 case MGSL_IOCSXCTRL:
1073 return set_xctrl(info, (int)arg);
1074 }
1075 mutex_lock(&info->port.mutex);
1076 switch (cmd) {
1077 case MGSL_IOCGPARAMS:
1078 ret = get_params(info, argp);
1079 break;
1080 case MGSL_IOCSPARAMS:
1081 ret = set_params(info, argp);
1082 break;
1083 case MGSL_IOCGTXIDLE:
1084 ret = get_txidle(info, argp);
1085 break;
1086 case MGSL_IOCSTXIDLE:
1087 ret = set_txidle(info, (int)arg);
1088 break;
1089 case MGSL_IOCTXENABLE:
1090 ret = tx_enable(info, (int)arg);
1091 break;
1092 case MGSL_IOCRXENABLE:
1093 ret = rx_enable(info, (int)arg);
1094 break;
1095 case MGSL_IOCTXABORT:
1096 ret = tx_abort(info);
1097 break;
1098 case MGSL_IOCGSTATS:
1099 ret = get_stats(info, argp);
1100 break;
1101 case MGSL_IOCGIF:
1102 ret = get_interface(info, argp);
1103 break;
1104 case MGSL_IOCSIF:
1105 ret = set_interface(info,(int)arg);
1106 break;
1107 default:
1108 ret = -ENOIOCTLCMD;
1109 }
1110 mutex_unlock(&info->port.mutex);
1111 return ret;
1112}
1113
1114static int get_icount(struct tty_struct *tty,
1115 struct serial_icounter_struct *icount)
1116
1117{
1118 struct slgt_info *info = tty->driver_data;
1119 struct mgsl_icount cnow; /* kernel counter temps */
1120 unsigned long flags;
1121
1122 spin_lock_irqsave(&info->lock,flags);
1123 cnow = info->icount;
1124 spin_unlock_irqrestore(&info->lock,flags);
1125
1126 icount->cts = cnow.cts;
1127 icount->dsr = cnow.dsr;
1128 icount->rng = cnow.rng;
1129 icount->dcd = cnow.dcd;
1130 icount->rx = cnow.rx;
1131 icount->tx = cnow.tx;
1132 icount->frame = cnow.frame;
1133 icount->overrun = cnow.overrun;
1134 icount->parity = cnow.parity;
1135 icount->brk = cnow.brk;
1136 icount->buf_overrun = cnow.buf_overrun;
1137
1138 return 0;
1139}
1140
1141/*
1142 * support for 32 bit ioctl calls on 64 bit systems
1143 */
1144#ifdef CONFIG_COMPAT
1145static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1146{
1147 struct MGSL_PARAMS32 tmp_params;
1148
1149 DBGINFO(("%s get_params32\n", info->device_name));
1150 memset(&tmp_params, 0, sizeof(tmp_params));
1151 tmp_params.mode = (compat_ulong_t)info->params.mode;
1152 tmp_params.loopback = info->params.loopback;
1153 tmp_params.flags = info->params.flags;
1154 tmp_params.encoding = info->params.encoding;
1155 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1156 tmp_params.addr_filter = info->params.addr_filter;
1157 tmp_params.crc_type = info->params.crc_type;
1158 tmp_params.preamble_length = info->params.preamble_length;
1159 tmp_params.preamble = info->params.preamble;
1160 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1161 tmp_params.data_bits = info->params.data_bits;
1162 tmp_params.stop_bits = info->params.stop_bits;
1163 tmp_params.parity = info->params.parity;
1164 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1165 return -EFAULT;
1166 return 0;
1167}
1168
1169static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1170{
1171 struct MGSL_PARAMS32 tmp_params;
1172
1173 DBGINFO(("%s set_params32\n", info->device_name));
1174 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1175 return -EFAULT;
1176
1177 spin_lock(&info->lock);
1178 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1179 info->base_clock = tmp_params.clock_speed;
1180 } else {
1181 info->params.mode = tmp_params.mode;
1182 info->params.loopback = tmp_params.loopback;
1183 info->params.flags = tmp_params.flags;
1184 info->params.encoding = tmp_params.encoding;
1185 info->params.clock_speed = tmp_params.clock_speed;
1186 info->params.addr_filter = tmp_params.addr_filter;
1187 info->params.crc_type = tmp_params.crc_type;
1188 info->params.preamble_length = tmp_params.preamble_length;
1189 info->params.preamble = tmp_params.preamble;
1190 info->params.data_rate = tmp_params.data_rate;
1191 info->params.data_bits = tmp_params.data_bits;
1192 info->params.stop_bits = tmp_params.stop_bits;
1193 info->params.parity = tmp_params.parity;
1194 }
1195 spin_unlock(&info->lock);
1196
1197 program_hw(info);
1198
1199 return 0;
1200}
1201
1202static long slgt_compat_ioctl(struct tty_struct *tty,
1203 unsigned int cmd, unsigned long arg)
1204{
1205 struct slgt_info *info = tty->driver_data;
1206 int rc = -ENOIOCTLCMD;
1207
1208 if (sanity_check(info, tty->name, "compat_ioctl"))
1209 return -ENODEV;
1210 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1211
1212 switch (cmd) {
1213
1214 case MGSL_IOCSPARAMS32:
1215 rc = set_params32(info, compat_ptr(arg));
1216 break;
1217
1218 case MGSL_IOCGPARAMS32:
1219 rc = get_params32(info, compat_ptr(arg));
1220 break;
1221
1222 case MGSL_IOCGPARAMS:
1223 case MGSL_IOCSPARAMS:
1224 case MGSL_IOCGTXIDLE:
1225 case MGSL_IOCGSTATS:
1226 case MGSL_IOCWAITEVENT:
1227 case MGSL_IOCGIF:
1228 case MGSL_IOCSGPIO:
1229 case MGSL_IOCGGPIO:
1230 case MGSL_IOCWAITGPIO:
1231 case MGSL_IOCGXSYNC:
1232 case MGSL_IOCGXCTRL:
1233 case MGSL_IOCSTXIDLE:
1234 case MGSL_IOCTXENABLE:
1235 case MGSL_IOCRXENABLE:
1236 case MGSL_IOCTXABORT:
1237 case TIOCMIWAIT:
1238 case MGSL_IOCSIF:
1239 case MGSL_IOCSXSYNC:
1240 case MGSL_IOCSXCTRL:
1241 rc = ioctl(tty, cmd, arg);
1242 break;
1243 }
1244
1245 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1246 return rc;
1247}
1248#else
1249#define slgt_compat_ioctl NULL
1250#endif /* ifdef CONFIG_COMPAT */
1251
1252/*
1253 * proc fs support
1254 */
1255static inline void line_info(struct seq_file *m, struct slgt_info *info)
1256{
1257 char stat_buf[30];
1258 unsigned long flags;
1259
1260 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1261 info->device_name, info->phys_reg_addr,
1262 info->irq_level, info->max_frame_size);
1263
1264 /* output current serial signal states */
1265 spin_lock_irqsave(&info->lock,flags);
1266 get_signals(info);
1267 spin_unlock_irqrestore(&info->lock,flags);
1268
1269 stat_buf[0] = 0;
1270 stat_buf[1] = 0;
1271 if (info->signals & SerialSignal_RTS)
1272 strcat(stat_buf, "|RTS");
1273 if (info->signals & SerialSignal_CTS)
1274 strcat(stat_buf, "|CTS");
1275 if (info->signals & SerialSignal_DTR)
1276 strcat(stat_buf, "|DTR");
1277 if (info->signals & SerialSignal_DSR)
1278 strcat(stat_buf, "|DSR");
1279 if (info->signals & SerialSignal_DCD)
1280 strcat(stat_buf, "|CD");
1281 if (info->signals & SerialSignal_RI)
1282 strcat(stat_buf, "|RI");
1283
1284 if (info->params.mode != MGSL_MODE_ASYNC) {
1285 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1286 info->icount.txok, info->icount.rxok);
1287 if (info->icount.txunder)
1288 seq_printf(m, " txunder:%d", info->icount.txunder);
1289 if (info->icount.txabort)
1290 seq_printf(m, " txabort:%d", info->icount.txabort);
1291 if (info->icount.rxshort)
1292 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1293 if (info->icount.rxlong)
1294 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1295 if (info->icount.rxover)
1296 seq_printf(m, " rxover:%d", info->icount.rxover);
1297 if (info->icount.rxcrc)
1298 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1299 } else {
1300 seq_printf(m, "\tASYNC tx:%d rx:%d",
1301 info->icount.tx, info->icount.rx);
1302 if (info->icount.frame)
1303 seq_printf(m, " fe:%d", info->icount.frame);
1304 if (info->icount.parity)
1305 seq_printf(m, " pe:%d", info->icount.parity);
1306 if (info->icount.brk)
1307 seq_printf(m, " brk:%d", info->icount.brk);
1308 if (info->icount.overrun)
1309 seq_printf(m, " oe:%d", info->icount.overrun);
1310 }
1311
1312 /* Append serial signal status to end */
1313 seq_printf(m, " %s\n", stat_buf+1);
1314
1315 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1316 info->tx_active,info->bh_requested,info->bh_running,
1317 info->pending_bh);
1318}
1319
1320/* Called to print information about devices
1321 */
1322static int synclink_gt_proc_show(struct seq_file *m, void *v)
1323{
1324 struct slgt_info *info;
1325
1326 seq_puts(m, "synclink_gt driver\n");
1327
1328 info = slgt_device_list;
1329 while( info ) {
1330 line_info(m, info);
1331 info = info->next_device;
1332 }
1333 return 0;
1334}
1335
1336static int synclink_gt_proc_open(struct inode *inode, struct file *file)
1337{
1338 return single_open(file, synclink_gt_proc_show, NULL);
1339}
1340
1341static const struct file_operations synclink_gt_proc_fops = {
1342 .owner = THIS_MODULE,
1343 .open = synclink_gt_proc_open,
1344 .read = seq_read,
1345 .llseek = seq_lseek,
1346 .release = single_release,
1347};
1348
1349/*
1350 * return count of bytes in transmit buffer
1351 */
1352static int chars_in_buffer(struct tty_struct *tty)
1353{
1354 struct slgt_info *info = tty->driver_data;
1355 int count;
1356 if (sanity_check(info, tty->name, "chars_in_buffer"))
1357 return 0;
1358 count = tbuf_bytes(info);
1359 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1360 return count;
1361}
1362
1363/*
1364 * signal remote device to throttle send data (our receive data)
1365 */
1366static void throttle(struct tty_struct * tty)
1367{
1368 struct slgt_info *info = tty->driver_data;
1369 unsigned long flags;
1370
1371 if (sanity_check(info, tty->name, "throttle"))
1372 return;
1373 DBGINFO(("%s throttle\n", info->device_name));
1374 if (I_IXOFF(tty))
1375 send_xchar(tty, STOP_CHAR(tty));
1376 if (tty->termios->c_cflag & CRTSCTS) {
1377 spin_lock_irqsave(&info->lock,flags);
1378 info->signals &= ~SerialSignal_RTS;
1379 set_signals(info);
1380 spin_unlock_irqrestore(&info->lock,flags);
1381 }
1382}
1383
1384/*
1385 * signal remote device to stop throttling send data (our receive data)
1386 */
1387static void unthrottle(struct tty_struct * tty)
1388{
1389 struct slgt_info *info = tty->driver_data;
1390 unsigned long flags;
1391
1392 if (sanity_check(info, tty->name, "unthrottle"))
1393 return;
1394 DBGINFO(("%s unthrottle\n", info->device_name));
1395 if (I_IXOFF(tty)) {
1396 if (info->x_char)
1397 info->x_char = 0;
1398 else
1399 send_xchar(tty, START_CHAR(tty));
1400 }
1401 if (tty->termios->c_cflag & CRTSCTS) {
1402 spin_lock_irqsave(&info->lock,flags);
1403 info->signals |= SerialSignal_RTS;
1404 set_signals(info);
1405 spin_unlock_irqrestore(&info->lock,flags);
1406 }
1407}
1408
1409/*
1410 * set or clear transmit break condition
1411 * break_state -1=set break condition, 0=clear
1412 */
1413static int set_break(struct tty_struct *tty, int break_state)
1414{
1415 struct slgt_info *info = tty->driver_data;
1416 unsigned short value;
1417 unsigned long flags;
1418
1419 if (sanity_check(info, tty->name, "set_break"))
1420 return -EINVAL;
1421 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1422
1423 spin_lock_irqsave(&info->lock,flags);
1424 value = rd_reg16(info, TCR);
1425 if (break_state == -1)
1426 value |= BIT6;
1427 else
1428 value &= ~BIT6;
1429 wr_reg16(info, TCR, value);
1430 spin_unlock_irqrestore(&info->lock,flags);
1431 return 0;
1432}
1433
1434#if SYNCLINK_GENERIC_HDLC
1435
1436/**
1437 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1438 * set encoding and frame check sequence (FCS) options
1439 *
1440 * dev pointer to network device structure
1441 * encoding serial encoding setting
1442 * parity FCS setting
1443 *
1444 * returns 0 if success, otherwise error code
1445 */
1446static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1447 unsigned short parity)
1448{
1449 struct slgt_info *info = dev_to_port(dev);
1450 unsigned char new_encoding;
1451 unsigned short new_crctype;
1452
1453 /* return error if TTY interface open */
1454 if (info->port.count)
1455 return -EBUSY;
1456
1457 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1458
1459 switch (encoding)
1460 {
1461 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1462 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1463 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1464 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1465 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1466 default: return -EINVAL;
1467 }
1468
1469 switch (parity)
1470 {
1471 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1472 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1473 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1474 default: return -EINVAL;
1475 }
1476
1477 info->params.encoding = new_encoding;
1478 info->params.crc_type = new_crctype;
1479
1480 /* if network interface up, reprogram hardware */
1481 if (info->netcount)
1482 program_hw(info);
1483
1484 return 0;
1485}
1486
1487/**
1488 * called by generic HDLC layer to send frame
1489 *
1490 * skb socket buffer containing HDLC frame
1491 * dev pointer to network device structure
1492 */
1493static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1494 struct net_device *dev)
1495{
1496 struct slgt_info *info = dev_to_port(dev);
1497 unsigned long flags;
1498
1499 DBGINFO(("%s hdlc_xmit\n", dev->name));
1500
1501 if (!skb->len)
1502 return NETDEV_TX_OK;
1503
1504 /* stop sending until this frame completes */
1505 netif_stop_queue(dev);
1506
1507 /* update network statistics */
1508 dev->stats.tx_packets++;
1509 dev->stats.tx_bytes += skb->len;
1510
1511 /* save start time for transmit timeout detection */
1512 dev->trans_start = jiffies;
1513
1514 spin_lock_irqsave(&info->lock, flags);
1515 tx_load(info, skb->data, skb->len);
1516 spin_unlock_irqrestore(&info->lock, flags);
1517
1518 /* done with socket buffer, so free it */
1519 dev_kfree_skb(skb);
1520
1521 return NETDEV_TX_OK;
1522}
1523
1524/**
1525 * called by network layer when interface enabled
1526 * claim resources and initialize hardware
1527 *
1528 * dev pointer to network device structure
1529 *
1530 * returns 0 if success, otherwise error code
1531 */
1532static int hdlcdev_open(struct net_device *dev)
1533{
1534 struct slgt_info *info = dev_to_port(dev);
1535 int rc;
1536 unsigned long flags;
1537
1538 if (!try_module_get(THIS_MODULE))
1539 return -EBUSY;
1540
1541 DBGINFO(("%s hdlcdev_open\n", dev->name));
1542
1543 /* generic HDLC layer open processing */
1544 if ((rc = hdlc_open(dev)))
1545 return rc;
1546
1547 /* arbitrate between network and tty opens */
1548 spin_lock_irqsave(&info->netlock, flags);
1549 if (info->port.count != 0 || info->netcount != 0) {
1550 DBGINFO(("%s hdlc_open busy\n", dev->name));
1551 spin_unlock_irqrestore(&info->netlock, flags);
1552 return -EBUSY;
1553 }
1554 info->netcount=1;
1555 spin_unlock_irqrestore(&info->netlock, flags);
1556
1557 /* claim resources and init adapter */
1558 if ((rc = startup(info)) != 0) {
1559 spin_lock_irqsave(&info->netlock, flags);
1560 info->netcount=0;
1561 spin_unlock_irqrestore(&info->netlock, flags);
1562 return rc;
1563 }
1564
1565 /* assert DTR and RTS, apply hardware settings */
1566 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1567 program_hw(info);
1568
1569 /* enable network layer transmit */
1570 dev->trans_start = jiffies;
1571 netif_start_queue(dev);
1572
1573 /* inform generic HDLC layer of current DCD status */
1574 spin_lock_irqsave(&info->lock, flags);
1575 get_signals(info);
1576 spin_unlock_irqrestore(&info->lock, flags);
1577 if (info->signals & SerialSignal_DCD)
1578 netif_carrier_on(dev);
1579 else
1580 netif_carrier_off(dev);
1581 return 0;
1582}
1583
1584/**
1585 * called by network layer when interface is disabled
1586 * shutdown hardware and release resources
1587 *
1588 * dev pointer to network device structure
1589 *
1590 * returns 0 if success, otherwise error code
1591 */
1592static int hdlcdev_close(struct net_device *dev)
1593{
1594 struct slgt_info *info = dev_to_port(dev);
1595 unsigned long flags;
1596
1597 DBGINFO(("%s hdlcdev_close\n", dev->name));
1598
1599 netif_stop_queue(dev);
1600
1601 /* shutdown adapter and release resources */
1602 shutdown(info);
1603
1604 hdlc_close(dev);
1605
1606 spin_lock_irqsave(&info->netlock, flags);
1607 info->netcount=0;
1608 spin_unlock_irqrestore(&info->netlock, flags);
1609
1610 module_put(THIS_MODULE);
1611 return 0;
1612}
1613
1614/**
1615 * called by network layer to process IOCTL call to network device
1616 *
1617 * dev pointer to network device structure
1618 * ifr pointer to network interface request structure
1619 * cmd IOCTL command code
1620 *
1621 * returns 0 if success, otherwise error code
1622 */
1623static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1624{
1625 const size_t size = sizeof(sync_serial_settings);
1626 sync_serial_settings new_line;
1627 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1628 struct slgt_info *info = dev_to_port(dev);
1629 unsigned int flags;
1630
1631 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1632
1633 /* return error if TTY interface open */
1634 if (info->port.count)
1635 return -EBUSY;
1636
1637 if (cmd != SIOCWANDEV)
1638 return hdlc_ioctl(dev, ifr, cmd);
1639
1640 memset(&new_line, 0, sizeof(new_line));
1641
1642 switch(ifr->ifr_settings.type) {
1643 case IF_GET_IFACE: /* return current sync_serial_settings */
1644
1645 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1646 if (ifr->ifr_settings.size < size) {
1647 ifr->ifr_settings.size = size; /* data size wanted */
1648 return -ENOBUFS;
1649 }
1650
1651 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1652 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1653 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1654 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1655
1656 switch (flags){
1657 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1658 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1659 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1660 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1661 default: new_line.clock_type = CLOCK_DEFAULT;
1662 }
1663
1664 new_line.clock_rate = info->params.clock_speed;
1665 new_line.loopback = info->params.loopback ? 1:0;
1666
1667 if (copy_to_user(line, &new_line, size))
1668 return -EFAULT;
1669 return 0;
1670
1671 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1672
1673 if(!capable(CAP_NET_ADMIN))
1674 return -EPERM;
1675 if (copy_from_user(&new_line, line, size))
1676 return -EFAULT;
1677
1678 switch (new_line.clock_type)
1679 {
1680 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1681 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1682 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1683 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1684 case CLOCK_DEFAULT: flags = info->params.flags &
1685 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1686 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1687 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1688 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1689 default: return -EINVAL;
1690 }
1691
1692 if (new_line.loopback != 0 && new_line.loopback != 1)
1693 return -EINVAL;
1694
1695 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1696 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1697 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1698 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1699 info->params.flags |= flags;
1700
1701 info->params.loopback = new_line.loopback;
1702
1703 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1704 info->params.clock_speed = new_line.clock_rate;
1705 else
1706 info->params.clock_speed = 0;
1707
1708 /* if network interface up, reprogram hardware */
1709 if (info->netcount)
1710 program_hw(info);
1711 return 0;
1712
1713 default:
1714 return hdlc_ioctl(dev, ifr, cmd);
1715 }
1716}
1717
1718/**
1719 * called by network layer when transmit timeout is detected
1720 *
1721 * dev pointer to network device structure
1722 */
1723static void hdlcdev_tx_timeout(struct net_device *dev)
1724{
1725 struct slgt_info *info = dev_to_port(dev);
1726 unsigned long flags;
1727
1728 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1729
1730 dev->stats.tx_errors++;
1731 dev->stats.tx_aborted_errors++;
1732
1733 spin_lock_irqsave(&info->lock,flags);
1734 tx_stop(info);
1735 spin_unlock_irqrestore(&info->lock,flags);
1736
1737 netif_wake_queue(dev);
1738}
1739
1740/**
1741 * called by device driver when transmit completes
1742 * reenable network layer transmit if stopped
1743 *
1744 * info pointer to device instance information
1745 */
1746static void hdlcdev_tx_done(struct slgt_info *info)
1747{
1748 if (netif_queue_stopped(info->netdev))
1749 netif_wake_queue(info->netdev);
1750}
1751
1752/**
1753 * called by device driver when frame received
1754 * pass frame to network layer
1755 *
1756 * info pointer to device instance information
1757 * buf pointer to buffer contianing frame data
1758 * size count of data bytes in buf
1759 */
1760static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1761{
1762 struct sk_buff *skb = dev_alloc_skb(size);
1763 struct net_device *dev = info->netdev;
1764
1765 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1766
1767 if (skb == NULL) {
1768 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1769 dev->stats.rx_dropped++;
1770 return;
1771 }
1772
1773 memcpy(skb_put(skb, size), buf, size);
1774
1775 skb->protocol = hdlc_type_trans(skb, dev);
1776
1777 dev->stats.rx_packets++;
1778 dev->stats.rx_bytes += size;
1779
1780 netif_rx(skb);
1781}
1782
1783static const struct net_device_ops hdlcdev_ops = {
1784 .ndo_open = hdlcdev_open,
1785 .ndo_stop = hdlcdev_close,
1786 .ndo_change_mtu = hdlc_change_mtu,
1787 .ndo_start_xmit = hdlc_start_xmit,
1788 .ndo_do_ioctl = hdlcdev_ioctl,
1789 .ndo_tx_timeout = hdlcdev_tx_timeout,
1790};
1791
1792/**
1793 * called by device driver when adding device instance
1794 * do generic HDLC initialization
1795 *
1796 * info pointer to device instance information
1797 *
1798 * returns 0 if success, otherwise error code
1799 */
1800static int hdlcdev_init(struct slgt_info *info)
1801{
1802 int rc;
1803 struct net_device *dev;
1804 hdlc_device *hdlc;
1805
1806 /* allocate and initialize network and HDLC layer objects */
1807
1808 if (!(dev = alloc_hdlcdev(info))) {
1809 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1810 return -ENOMEM;
1811 }
1812
1813 /* for network layer reporting purposes only */
1814 dev->mem_start = info->phys_reg_addr;
1815 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1816 dev->irq = info->irq_level;
1817
1818 /* network layer callbacks and settings */
1819 dev->netdev_ops = &hdlcdev_ops;
1820 dev->watchdog_timeo = 10 * HZ;
1821 dev->tx_queue_len = 50;
1822
1823 /* generic HDLC layer callbacks and settings */
1824 hdlc = dev_to_hdlc(dev);
1825 hdlc->attach = hdlcdev_attach;
1826 hdlc->xmit = hdlcdev_xmit;
1827
1828 /* register objects with HDLC layer */
1829 if ((rc = register_hdlc_device(dev))) {
1830 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1831 free_netdev(dev);
1832 return rc;
1833 }
1834
1835 info->netdev = dev;
1836 return 0;
1837}
1838
1839/**
1840 * called by device driver when removing device instance
1841 * do generic HDLC cleanup
1842 *
1843 * info pointer to device instance information
1844 */
1845static void hdlcdev_exit(struct slgt_info *info)
1846{
1847 unregister_hdlc_device(info->netdev);
1848 free_netdev(info->netdev);
1849 info->netdev = NULL;
1850}
1851
1852#endif /* ifdef CONFIG_HDLC */
1853
1854/*
1855 * get async data from rx DMA buffers
1856 */
1857static void rx_async(struct slgt_info *info)
1858{
1859 struct tty_struct *tty = info->port.tty;
1860 struct mgsl_icount *icount = &info->icount;
1861 unsigned int start, end;
1862 unsigned char *p;
1863 unsigned char status;
1864 struct slgt_desc *bufs = info->rbufs;
1865 int i, count;
1866 int chars = 0;
1867 int stat;
1868 unsigned char ch;
1869
1870 start = end = info->rbuf_current;
1871
1872 while(desc_complete(bufs[end])) {
1873 count = desc_count(bufs[end]) - info->rbuf_index;
1874 p = bufs[end].buf + info->rbuf_index;
1875
1876 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1877 DBGDATA(info, p, count, "rx");
1878
1879 for(i=0 ; i < count; i+=2, p+=2) {
1880 ch = *p;
1881 icount->rx++;
1882
1883 stat = 0;
1884
1885 if ((status = *(p+1) & (BIT1 + BIT0))) {
1886 if (status & BIT1)
1887 icount->parity++;
1888 else if (status & BIT0)
1889 icount->frame++;
1890 /* discard char if tty control flags say so */
1891 if (status & info->ignore_status_mask)
1892 continue;
1893 if (status & BIT1)
1894 stat = TTY_PARITY;
1895 else if (status & BIT0)
1896 stat = TTY_FRAME;
1897 }
1898 if (tty) {
1899 tty_insert_flip_char(tty, ch, stat);
1900 chars++;
1901 }
1902 }
1903
1904 if (i < count) {
1905 /* receive buffer not completed */
1906 info->rbuf_index += i;
1907 mod_timer(&info->rx_timer, jiffies + 1);
1908 break;
1909 }
1910
1911 info->rbuf_index = 0;
1912 free_rbufs(info, end, end);
1913
1914 if (++end == info->rbuf_count)
1915 end = 0;
1916
1917 /* if entire list searched then no frame available */
1918 if (end == start)
1919 break;
1920 }
1921
1922 if (tty && chars)
1923 tty_flip_buffer_push(tty);
1924}
1925
1926/*
1927 * return next bottom half action to perform
1928 */
1929static int bh_action(struct slgt_info *info)
1930{
1931 unsigned long flags;
1932 int rc;
1933
1934 spin_lock_irqsave(&info->lock,flags);
1935
1936 if (info->pending_bh & BH_RECEIVE) {
1937 info->pending_bh &= ~BH_RECEIVE;
1938 rc = BH_RECEIVE;
1939 } else if (info->pending_bh & BH_TRANSMIT) {
1940 info->pending_bh &= ~BH_TRANSMIT;
1941 rc = BH_TRANSMIT;
1942 } else if (info->pending_bh & BH_STATUS) {
1943 info->pending_bh &= ~BH_STATUS;
1944 rc = BH_STATUS;
1945 } else {
1946 /* Mark BH routine as complete */
1947 info->bh_running = false;
1948 info->bh_requested = false;
1949 rc = 0;
1950 }
1951
1952 spin_unlock_irqrestore(&info->lock,flags);
1953
1954 return rc;
1955}
1956
1957/*
1958 * perform bottom half processing
1959 */
1960static void bh_handler(struct work_struct *work)
1961{
1962 struct slgt_info *info = container_of(work, struct slgt_info, task);
1963 int action;
1964
1965 if (!info)
1966 return;
1967 info->bh_running = true;
1968
1969 while((action = bh_action(info))) {
1970 switch (action) {
1971 case BH_RECEIVE:
1972 DBGBH(("%s bh receive\n", info->device_name));
1973 switch(info->params.mode) {
1974 case MGSL_MODE_ASYNC:
1975 rx_async(info);
1976 break;
1977 case MGSL_MODE_HDLC:
1978 while(rx_get_frame(info));
1979 break;
1980 case MGSL_MODE_RAW:
1981 case MGSL_MODE_MONOSYNC:
1982 case MGSL_MODE_BISYNC:
1983 case MGSL_MODE_XSYNC:
1984 while(rx_get_buf(info));
1985 break;
1986 }
1987 /* restart receiver if rx DMA buffers exhausted */
1988 if (info->rx_restart)
1989 rx_start(info);
1990 break;
1991 case BH_TRANSMIT:
1992 bh_transmit(info);
1993 break;
1994 case BH_STATUS:
1995 DBGBH(("%s bh status\n", info->device_name));
1996 info->ri_chkcount = 0;
1997 info->dsr_chkcount = 0;
1998 info->dcd_chkcount = 0;
1999 info->cts_chkcount = 0;
2000 break;
2001 default:
2002 DBGBH(("%s unknown action\n", info->device_name));
2003 break;
2004 }
2005 }
2006 DBGBH(("%s bh_handler exit\n", info->device_name));
2007}
2008
2009static void bh_transmit(struct slgt_info *info)
2010{
2011 struct tty_struct *tty = info->port.tty;
2012
2013 DBGBH(("%s bh_transmit\n", info->device_name));
2014 if (tty)
2015 tty_wakeup(tty);
2016}
2017
2018static void dsr_change(struct slgt_info *info, unsigned short status)
2019{
2020 if (status & BIT3) {
2021 info->signals |= SerialSignal_DSR;
2022 info->input_signal_events.dsr_up++;
2023 } else {
2024 info->signals &= ~SerialSignal_DSR;
2025 info->input_signal_events.dsr_down++;
2026 }
2027 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2028 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2029 slgt_irq_off(info, IRQ_DSR);
2030 return;
2031 }
2032 info->icount.dsr++;
2033 wake_up_interruptible(&info->status_event_wait_q);
2034 wake_up_interruptible(&info->event_wait_q);
2035 info->pending_bh |= BH_STATUS;
2036}
2037
2038static void cts_change(struct slgt_info *info, unsigned short status)
2039{
2040 if (status & BIT2) {
2041 info->signals |= SerialSignal_CTS;
2042 info->input_signal_events.cts_up++;
2043 } else {
2044 info->signals &= ~SerialSignal_CTS;
2045 info->input_signal_events.cts_down++;
2046 }
2047 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2048 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2049 slgt_irq_off(info, IRQ_CTS);
2050 return;
2051 }
2052 info->icount.cts++;
2053 wake_up_interruptible(&info->status_event_wait_q);
2054 wake_up_interruptible(&info->event_wait_q);
2055 info->pending_bh |= BH_STATUS;
2056
2057 if (info->port.flags & ASYNC_CTS_FLOW) {
2058 if (info->port.tty) {
2059 if (info->port.tty->hw_stopped) {
2060 if (info->signals & SerialSignal_CTS) {
2061 info->port.tty->hw_stopped = 0;
2062 info->pending_bh |= BH_TRANSMIT;
2063 return;
2064 }
2065 } else {
2066 if (!(info->signals & SerialSignal_CTS))
2067 info->port.tty->hw_stopped = 1;
2068 }
2069 }
2070 }
2071}
2072
2073static void dcd_change(struct slgt_info *info, unsigned short status)
2074{
2075 if (status & BIT1) {
2076 info->signals |= SerialSignal_DCD;
2077 info->input_signal_events.dcd_up++;
2078 } else {
2079 info->signals &= ~SerialSignal_DCD;
2080 info->input_signal_events.dcd_down++;
2081 }
2082 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2083 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2084 slgt_irq_off(info, IRQ_DCD);
2085 return;
2086 }
2087 info->icount.dcd++;
2088#if SYNCLINK_GENERIC_HDLC
2089 if (info->netcount) {
2090 if (info->signals & SerialSignal_DCD)
2091 netif_carrier_on(info->netdev);
2092 else
2093 netif_carrier_off(info->netdev);
2094 }
2095#endif
2096 wake_up_interruptible(&info->status_event_wait_q);
2097 wake_up_interruptible(&info->event_wait_q);
2098 info->pending_bh |= BH_STATUS;
2099
2100 if (info->port.flags & ASYNC_CHECK_CD) {
2101 if (info->signals & SerialSignal_DCD)
2102 wake_up_interruptible(&info->port.open_wait);
2103 else {
2104 if (info->port.tty)
2105 tty_hangup(info->port.tty);
2106 }
2107 }
2108}
2109
2110static void ri_change(struct slgt_info *info, unsigned short status)
2111{
2112 if (status & BIT0) {
2113 info->signals |= SerialSignal_RI;
2114 info->input_signal_events.ri_up++;
2115 } else {
2116 info->signals &= ~SerialSignal_RI;
2117 info->input_signal_events.ri_down++;
2118 }
2119 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2120 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2121 slgt_irq_off(info, IRQ_RI);
2122 return;
2123 }
2124 info->icount.rng++;
2125 wake_up_interruptible(&info->status_event_wait_q);
2126 wake_up_interruptible(&info->event_wait_q);
2127 info->pending_bh |= BH_STATUS;
2128}
2129
2130static void isr_rxdata(struct slgt_info *info)
2131{
2132 unsigned int count = info->rbuf_fill_count;
2133 unsigned int i = info->rbuf_fill_index;
2134 unsigned short reg;
2135
2136 while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2137 reg = rd_reg16(info, RDR);
2138 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2139 if (desc_complete(info->rbufs[i])) {
2140 /* all buffers full */
2141 rx_stop(info);
2142 info->rx_restart = 1;
2143 continue;
2144 }
2145 info->rbufs[i].buf[count++] = (unsigned char)reg;
2146 /* async mode saves status byte to buffer for each data byte */
2147 if (info->params.mode == MGSL_MODE_ASYNC)
2148 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2149 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2150 /* buffer full or end of frame */
2151 set_desc_count(info->rbufs[i], count);
2152 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2153 info->rbuf_fill_count = count = 0;
2154 if (++i == info->rbuf_count)
2155 i = 0;
2156 info->pending_bh |= BH_RECEIVE;
2157 }
2158 }
2159
2160 info->rbuf_fill_index = i;
2161 info->rbuf_fill_count = count;
2162}
2163
2164static void isr_serial(struct slgt_info *info)
2165{
2166 unsigned short status = rd_reg16(info, SSR);
2167
2168 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2169
2170 wr_reg16(info, SSR, status); /* clear pending */
2171
2172 info->irq_occurred = true;
2173
2174 if (info->params.mode == MGSL_MODE_ASYNC) {
2175 if (status & IRQ_TXIDLE) {
2176 if (info->tx_active)
2177 isr_txeom(info, status);
2178 }
2179 if (info->rx_pio && (status & IRQ_RXDATA))
2180 isr_rxdata(info);
2181 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2182 info->icount.brk++;
2183 /* process break detection if tty control allows */
2184 if (info->port.tty) {
2185 if (!(status & info->ignore_status_mask)) {
2186 if (info->read_status_mask & MASK_BREAK) {
2187 tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
2188 if (info->port.flags & ASYNC_SAK)
2189 do_SAK(info->port.tty);
2190 }
2191 }
2192 }
2193 }
2194 } else {
2195 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2196 isr_txeom(info, status);
2197 if (info->rx_pio && (status & IRQ_RXDATA))
2198 isr_rxdata(info);
2199 if (status & IRQ_RXIDLE) {
2200 if (status & RXIDLE)
2201 info->icount.rxidle++;
2202 else
2203 info->icount.exithunt++;
2204 wake_up_interruptible(&info->event_wait_q);
2205 }
2206
2207 if (status & IRQ_RXOVER)
2208 rx_start(info);
2209 }
2210
2211 if (status & IRQ_DSR)
2212 dsr_change(info, status);
2213 if (status & IRQ_CTS)
2214 cts_change(info, status);
2215 if (status & IRQ_DCD)
2216 dcd_change(info, status);
2217 if (status & IRQ_RI)
2218 ri_change(info, status);
2219}
2220
2221static void isr_rdma(struct slgt_info *info)
2222{
2223 unsigned int status = rd_reg32(info, RDCSR);
2224
2225 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2226
2227 /* RDCSR (rx DMA control/status)
2228 *
2229 * 31..07 reserved
2230 * 06 save status byte to DMA buffer
2231 * 05 error
2232 * 04 eol (end of list)
2233 * 03 eob (end of buffer)
2234 * 02 IRQ enable
2235 * 01 reset
2236 * 00 enable
2237 */
2238 wr_reg32(info, RDCSR, status); /* clear pending */
2239
2240 if (status & (BIT5 + BIT4)) {
2241 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2242 info->rx_restart = true;
2243 }
2244 info->pending_bh |= BH_RECEIVE;
2245}
2246
2247static void isr_tdma(struct slgt_info *info)
2248{
2249 unsigned int status = rd_reg32(info, TDCSR);
2250
2251 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2252
2253 /* TDCSR (tx DMA control/status)
2254 *
2255 * 31..06 reserved
2256 * 05 error
2257 * 04 eol (end of list)
2258 * 03 eob (end of buffer)
2259 * 02 IRQ enable
2260 * 01 reset
2261 * 00 enable
2262 */
2263 wr_reg32(info, TDCSR, status); /* clear pending */
2264
2265 if (status & (BIT5 + BIT4 + BIT3)) {
2266 // another transmit buffer has completed
2267 // run bottom half to get more send data from user
2268 info->pending_bh |= BH_TRANSMIT;
2269 }
2270}
2271
2272/*
2273 * return true if there are unsent tx DMA buffers, otherwise false
2274 *
2275 * if there are unsent buffers then info->tbuf_start
2276 * is set to index of first unsent buffer
2277 */
2278static bool unsent_tbufs(struct slgt_info *info)
2279{
2280 unsigned int i = info->tbuf_current;
2281 bool rc = false;
2282
2283 /*
2284 * search backwards from last loaded buffer (precedes tbuf_current)
2285 * for first unsent buffer (desc_count > 0)
2286 */
2287
2288 do {
2289 if (i)
2290 i--;
2291 else
2292 i = info->tbuf_count - 1;
2293 if (!desc_count(info->tbufs[i]))
2294 break;
2295 info->tbuf_start = i;
2296 rc = true;
2297 } while (i != info->tbuf_current);
2298
2299 return rc;
2300}
2301
2302static void isr_txeom(struct slgt_info *info, unsigned short status)
2303{
2304 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2305
2306 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2307 tdma_reset(info);
2308 if (status & IRQ_TXUNDER) {
2309 unsigned short val = rd_reg16(info, TCR);
2310 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2311 wr_reg16(info, TCR, val); /* clear reset bit */
2312 }
2313
2314 if (info->tx_active) {
2315 if (info->params.mode != MGSL_MODE_ASYNC) {
2316 if (status & IRQ_TXUNDER)
2317 info->icount.txunder++;
2318 else if (status & IRQ_TXIDLE)
2319 info->icount.txok++;
2320 }
2321
2322 if (unsent_tbufs(info)) {
2323 tx_start(info);
2324 update_tx_timer(info);
2325 return;
2326 }
2327 info->tx_active = false;
2328
2329 del_timer(&info->tx_timer);
2330
2331 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2332 info->signals &= ~SerialSignal_RTS;
2333 info->drop_rts_on_tx_done = false;
2334 set_signals(info);
2335 }
2336
2337#if SYNCLINK_GENERIC_HDLC
2338 if (info->netcount)
2339 hdlcdev_tx_done(info);
2340 else
2341#endif
2342 {
2343 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2344 tx_stop(info);
2345 return;
2346 }
2347 info->pending_bh |= BH_TRANSMIT;
2348 }
2349 }
2350}
2351
2352static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2353{
2354 struct cond_wait *w, *prev;
2355
2356 /* wake processes waiting for specific transitions */
2357 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2358 if (w->data & changed) {
2359 w->data = state;
2360 wake_up_interruptible(&w->q);
2361 if (prev != NULL)
2362 prev->next = w->next;
2363 else
2364 info->gpio_wait_q = w->next;
2365 } else
2366 prev = w;
2367 }
2368}
2369
2370/* interrupt service routine
2371 *
2372 * irq interrupt number
2373 * dev_id device ID supplied during interrupt registration
2374 */
2375static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2376{
2377 struct slgt_info *info = dev_id;
2378 unsigned int gsr;
2379 unsigned int i;
2380
2381 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2382
2383 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2384 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2385 info->irq_occurred = true;
2386 for(i=0; i < info->port_count ; i++) {
2387 if (info->port_array[i] == NULL)
2388 continue;
2389 spin_lock(&info->port_array[i]->lock);
2390 if (gsr & (BIT8 << i))
2391 isr_serial(info->port_array[i]);
2392 if (gsr & (BIT16 << (i*2)))
2393 isr_rdma(info->port_array[i]);
2394 if (gsr & (BIT17 << (i*2)))
2395 isr_tdma(info->port_array[i]);
2396 spin_unlock(&info->port_array[i]->lock);
2397 }
2398 }
2399
2400 if (info->gpio_present) {
2401 unsigned int state;
2402 unsigned int changed;
2403 spin_lock(&info->lock);
2404 while ((changed = rd_reg32(info, IOSR)) != 0) {
2405 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2406 /* read latched state of GPIO signals */
2407 state = rd_reg32(info, IOVR);
2408 /* clear pending GPIO interrupt bits */
2409 wr_reg32(info, IOSR, changed);
2410 for (i=0 ; i < info->port_count ; i++) {
2411 if (info->port_array[i] != NULL)
2412 isr_gpio(info->port_array[i], changed, state);
2413 }
2414 }
2415 spin_unlock(&info->lock);
2416 }
2417
2418 for(i=0; i < info->port_count ; i++) {
2419 struct slgt_info *port = info->port_array[i];
2420 if (port == NULL)
2421 continue;
2422 spin_lock(&port->lock);
2423 if ((port->port.count || port->netcount) &&
2424 port->pending_bh && !port->bh_running &&
2425 !port->bh_requested) {
2426 DBGISR(("%s bh queued\n", port->device_name));
2427 schedule_work(&port->task);
2428 port->bh_requested = true;
2429 }
2430 spin_unlock(&port->lock);
2431 }
2432
2433 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2434 return IRQ_HANDLED;
2435}
2436
2437static int startup(struct slgt_info *info)
2438{
2439 DBGINFO(("%s startup\n", info->device_name));
2440
2441 if (info->port.flags & ASYNC_INITIALIZED)
2442 return 0;
2443
2444 if (!info->tx_buf) {
2445 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2446 if (!info->tx_buf) {
2447 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2448 return -ENOMEM;
2449 }
2450 }
2451
2452 info->pending_bh = 0;
2453
2454 memset(&info->icount, 0, sizeof(info->icount));
2455
2456 /* program hardware for current parameters */
2457 change_params(info);
2458
2459 if (info->port.tty)
2460 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2461
2462 info->port.flags |= ASYNC_INITIALIZED;
2463
2464 return 0;
2465}
2466
2467/*
2468 * called by close() and hangup() to shutdown hardware
2469 */
2470static void shutdown(struct slgt_info *info)
2471{
2472 unsigned long flags;
2473
2474 if (!(info->port.flags & ASYNC_INITIALIZED))
2475 return;
2476
2477 DBGINFO(("%s shutdown\n", info->device_name));
2478
2479 /* clear status wait queue because status changes */
2480 /* can't happen after shutting down the hardware */
2481 wake_up_interruptible(&info->status_event_wait_q);
2482 wake_up_interruptible(&info->event_wait_q);
2483
2484 del_timer_sync(&info->tx_timer);
2485 del_timer_sync(&info->rx_timer);
2486
2487 kfree(info->tx_buf);
2488 info->tx_buf = NULL;
2489
2490 spin_lock_irqsave(&info->lock,flags);
2491
2492 tx_stop(info);
2493 rx_stop(info);
2494
2495 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2496
2497 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2498 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2499 set_signals(info);
2500 }
2501
2502 flush_cond_wait(&info->gpio_wait_q);
2503
2504 spin_unlock_irqrestore(&info->lock,flags);
2505
2506 if (info->port.tty)
2507 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2508
2509 info->port.flags &= ~ASYNC_INITIALIZED;
2510}
2511
2512static void program_hw(struct slgt_info *info)
2513{
2514 unsigned long flags;
2515
2516 spin_lock_irqsave(&info->lock,flags);
2517
2518 rx_stop(info);
2519 tx_stop(info);
2520
2521 if (info->params.mode != MGSL_MODE_ASYNC ||
2522 info->netcount)
2523 sync_mode(info);
2524 else
2525 async_mode(info);
2526
2527 set_signals(info);
2528
2529 info->dcd_chkcount = 0;
2530 info->cts_chkcount = 0;
2531 info->ri_chkcount = 0;
2532 info->dsr_chkcount = 0;
2533
2534 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2535 get_signals(info);
2536
2537 if (info->netcount ||
2538 (info->port.tty && info->port.tty->termios->c_cflag & CREAD))
2539 rx_start(info);
2540
2541 spin_unlock_irqrestore(&info->lock,flags);
2542}
2543
2544/*
2545 * reconfigure adapter based on new parameters
2546 */
2547static void change_params(struct slgt_info *info)
2548{
2549 unsigned cflag;
2550 int bits_per_char;
2551
2552 if (!info->port.tty || !info->port.tty->termios)
2553 return;
2554 DBGINFO(("%s change_params\n", info->device_name));
2555
2556 cflag = info->port.tty->termios->c_cflag;
2557
2558 /* if B0 rate (hangup) specified then negate DTR and RTS */
2559 /* otherwise assert DTR and RTS */
2560 if (cflag & CBAUD)
2561 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2562 else
2563 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2564
2565 /* byte size and parity */
2566
2567 switch (cflag & CSIZE) {
2568 case CS5: info->params.data_bits = 5; break;
2569 case CS6: info->params.data_bits = 6; break;
2570 case CS7: info->params.data_bits = 7; break;
2571 case CS8: info->params.data_bits = 8; break;
2572 default: info->params.data_bits = 7; break;
2573 }
2574
2575 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2576
2577 if (cflag & PARENB)
2578 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2579 else
2580 info->params.parity = ASYNC_PARITY_NONE;
2581
2582 /* calculate number of jiffies to transmit a full
2583 * FIFO (32 bytes) at specified data rate
2584 */
2585 bits_per_char = info->params.data_bits +
2586 info->params.stop_bits + 1;
2587
2588 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2589
2590 if (info->params.data_rate) {
2591 info->timeout = (32*HZ*bits_per_char) /
2592 info->params.data_rate;
2593 }
2594 info->timeout += HZ/50; /* Add .02 seconds of slop */
2595
2596 if (cflag & CRTSCTS)
2597 info->port.flags |= ASYNC_CTS_FLOW;
2598 else
2599 info->port.flags &= ~ASYNC_CTS_FLOW;
2600
2601 if (cflag & CLOCAL)
2602 info->port.flags &= ~ASYNC_CHECK_CD;
2603 else
2604 info->port.flags |= ASYNC_CHECK_CD;
2605
2606 /* process tty input control flags */
2607
2608 info->read_status_mask = IRQ_RXOVER;
2609 if (I_INPCK(info->port.tty))
2610 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2611 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2612 info->read_status_mask |= MASK_BREAK;
2613 if (I_IGNPAR(info->port.tty))
2614 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2615 if (I_IGNBRK(info->port.tty)) {
2616 info->ignore_status_mask |= MASK_BREAK;
2617 /* If ignoring parity and break indicators, ignore
2618 * overruns too. (For real raw support).
2619 */
2620 if (I_IGNPAR(info->port.tty))
2621 info->ignore_status_mask |= MASK_OVERRUN;
2622 }
2623
2624 program_hw(info);
2625}
2626
2627static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2628{
2629 DBGINFO(("%s get_stats\n", info->device_name));
2630 if (!user_icount) {
2631 memset(&info->icount, 0, sizeof(info->icount));
2632 } else {
2633 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2634 return -EFAULT;
2635 }
2636 return 0;
2637}
2638
2639static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2640{
2641 DBGINFO(("%s get_params\n", info->device_name));
2642 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2643 return -EFAULT;
2644 return 0;
2645}
2646
2647static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2648{
2649 unsigned long flags;
2650 MGSL_PARAMS tmp_params;
2651
2652 DBGINFO(("%s set_params\n", info->device_name));
2653 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2654 return -EFAULT;
2655
2656 spin_lock_irqsave(&info->lock, flags);
2657 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2658 info->base_clock = tmp_params.clock_speed;
2659 else
2660 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2661 spin_unlock_irqrestore(&info->lock, flags);
2662
2663 program_hw(info);
2664
2665 return 0;
2666}
2667
2668static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2669{
2670 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2671 if (put_user(info->idle_mode, idle_mode))
2672 return -EFAULT;
2673 return 0;
2674}
2675
2676static int set_txidle(struct slgt_info *info, int idle_mode)
2677{
2678 unsigned long flags;
2679 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2680 spin_lock_irqsave(&info->lock,flags);
2681 info->idle_mode = idle_mode;
2682 if (info->params.mode != MGSL_MODE_ASYNC)
2683 tx_set_idle(info);
2684 spin_unlock_irqrestore(&info->lock,flags);
2685 return 0;
2686}
2687
2688static int tx_enable(struct slgt_info *info, int enable)
2689{
2690 unsigned long flags;
2691 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2692 spin_lock_irqsave(&info->lock,flags);
2693 if (enable) {
2694 if (!info->tx_enabled)
2695 tx_start(info);
2696 } else {
2697 if (info->tx_enabled)
2698 tx_stop(info);
2699 }
2700 spin_unlock_irqrestore(&info->lock,flags);
2701 return 0;
2702}
2703
2704/*
2705 * abort transmit HDLC frame
2706 */
2707static int tx_abort(struct slgt_info *info)
2708{
2709 unsigned long flags;
2710 DBGINFO(("%s tx_abort\n", info->device_name));
2711 spin_lock_irqsave(&info->lock,flags);
2712 tdma_reset(info);
2713 spin_unlock_irqrestore(&info->lock,flags);
2714 return 0;
2715}
2716
2717static int rx_enable(struct slgt_info *info, int enable)
2718{
2719 unsigned long flags;
2720 unsigned int rbuf_fill_level;
2721 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2722 spin_lock_irqsave(&info->lock,flags);
2723 /*
2724 * enable[31..16] = receive DMA buffer fill level
2725 * 0 = noop (leave fill level unchanged)
2726 * fill level must be multiple of 4 and <= buffer size
2727 */
2728 rbuf_fill_level = ((unsigned int)enable) >> 16;
2729 if (rbuf_fill_level) {
2730 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2731 spin_unlock_irqrestore(&info->lock, flags);
2732 return -EINVAL;
2733 }
2734 info->rbuf_fill_level = rbuf_fill_level;
2735 if (rbuf_fill_level < 128)
2736 info->rx_pio = 1; /* PIO mode */
2737 else
2738 info->rx_pio = 0; /* DMA mode */
2739 rx_stop(info); /* restart receiver to use new fill level */
2740 }
2741
2742 /*
2743 * enable[1..0] = receiver enable command
2744 * 0 = disable
2745 * 1 = enable
2746 * 2 = enable or force hunt mode if already enabled
2747 */
2748 enable &= 3;
2749 if (enable) {
2750 if (!info->rx_enabled)
2751 rx_start(info);
2752 else if (enable == 2) {
2753 /* force hunt mode (write 1 to RCR[3]) */
2754 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2755 }
2756 } else {
2757 if (info->rx_enabled)
2758 rx_stop(info);
2759 }
2760 spin_unlock_irqrestore(&info->lock,flags);
2761 return 0;
2762}
2763
2764/*
2765 * wait for specified event to occur
2766 */
2767static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2768{
2769 unsigned long flags;
2770 int s;
2771 int rc=0;
2772 struct mgsl_icount cprev, cnow;
2773 int events;
2774 int mask;
2775 struct _input_signal_events oldsigs, newsigs;
2776 DECLARE_WAITQUEUE(wait, current);
2777
2778 if (get_user(mask, mask_ptr))
2779 return -EFAULT;
2780
2781 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2782
2783 spin_lock_irqsave(&info->lock,flags);
2784
2785 /* return immediately if state matches requested events */
2786 get_signals(info);
2787 s = info->signals;
2788
2789 events = mask &
2790 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2791 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2792 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2793 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2794 if (events) {
2795 spin_unlock_irqrestore(&info->lock,flags);
2796 goto exit;
2797 }
2798
2799 /* save current irq counts */
2800 cprev = info->icount;
2801 oldsigs = info->input_signal_events;
2802
2803 /* enable hunt and idle irqs if needed */
2804 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2805 unsigned short val = rd_reg16(info, SCR);
2806 if (!(val & IRQ_RXIDLE))
2807 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2808 }
2809
2810 set_current_state(TASK_INTERRUPTIBLE);
2811 add_wait_queue(&info->event_wait_q, &wait);
2812
2813 spin_unlock_irqrestore(&info->lock,flags);
2814
2815 for(;;) {
2816 schedule();
2817 if (signal_pending(current)) {
2818 rc = -ERESTARTSYS;
2819 break;
2820 }
2821
2822 /* get current irq counts */
2823 spin_lock_irqsave(&info->lock,flags);
2824 cnow = info->icount;
2825 newsigs = info->input_signal_events;
2826 set_current_state(TASK_INTERRUPTIBLE);
2827 spin_unlock_irqrestore(&info->lock,flags);
2828
2829 /* if no change, wait aborted for some reason */
2830 if (newsigs.dsr_up == oldsigs.dsr_up &&
2831 newsigs.dsr_down == oldsigs.dsr_down &&
2832 newsigs.dcd_up == oldsigs.dcd_up &&
2833 newsigs.dcd_down == oldsigs.dcd_down &&
2834 newsigs.cts_up == oldsigs.cts_up &&
2835 newsigs.cts_down == oldsigs.cts_down &&
2836 newsigs.ri_up == oldsigs.ri_up &&
2837 newsigs.ri_down == oldsigs.ri_down &&
2838 cnow.exithunt == cprev.exithunt &&
2839 cnow.rxidle == cprev.rxidle) {
2840 rc = -EIO;
2841 break;
2842 }
2843
2844 events = mask &
2845 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2846 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2847 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2848 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2849 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2850 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2851 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2852 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2853 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2854 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2855 if (events)
2856 break;
2857
2858 cprev = cnow;
2859 oldsigs = newsigs;
2860 }
2861
2862 remove_wait_queue(&info->event_wait_q, &wait);
2863 set_current_state(TASK_RUNNING);
2864
2865
2866 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2867 spin_lock_irqsave(&info->lock,flags);
2868 if (!waitqueue_active(&info->event_wait_q)) {
2869 /* disable enable exit hunt mode/idle rcvd IRQs */
2870 wr_reg16(info, SCR,
2871 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2872 }
2873 spin_unlock_irqrestore(&info->lock,flags);
2874 }
2875exit:
2876 if (rc == 0)
2877 rc = put_user(events, mask_ptr);
2878 return rc;
2879}
2880
2881static int get_interface(struct slgt_info *info, int __user *if_mode)
2882{
2883 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2884 if (put_user(info->if_mode, if_mode))
2885 return -EFAULT;
2886 return 0;
2887}
2888
2889static int set_interface(struct slgt_info *info, int if_mode)
2890{
2891 unsigned long flags;
2892 unsigned short val;
2893
2894 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2895 spin_lock_irqsave(&info->lock,flags);
2896 info->if_mode = if_mode;
2897
2898 msc_set_vcr(info);
2899
2900 /* TCR (tx control) 07 1=RTS driver control */
2901 val = rd_reg16(info, TCR);
2902 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2903 val |= BIT7;
2904 else
2905 val &= ~BIT7;
2906 wr_reg16(info, TCR, val);
2907
2908 spin_unlock_irqrestore(&info->lock,flags);
2909 return 0;
2910}
2911
2912static int get_xsync(struct slgt_info *info, int __user *xsync)
2913{
2914 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2915 if (put_user(info->xsync, xsync))
2916 return -EFAULT;
2917 return 0;
2918}
2919
2920/*
2921 * set extended sync pattern (1 to 4 bytes) for extended sync mode
2922 *
2923 * sync pattern is contained in least significant bytes of value
2924 * most significant byte of sync pattern is oldest (1st sent/detected)
2925 */
2926static int set_xsync(struct slgt_info *info, int xsync)
2927{
2928 unsigned long flags;
2929
2930 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2931 spin_lock_irqsave(&info->lock, flags);
2932 info->xsync = xsync;
2933 wr_reg32(info, XSR, xsync);
2934 spin_unlock_irqrestore(&info->lock, flags);
2935 return 0;
2936}
2937
2938static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2939{
2940 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2941 if (put_user(info->xctrl, xctrl))
2942 return -EFAULT;
2943 return 0;
2944}
2945
2946/*
2947 * set extended control options
2948 *
2949 * xctrl[31:19] reserved, must be zero
2950 * xctrl[18:17] extended sync pattern length in bytes
2951 * 00 = 1 byte in xsr[7:0]
2952 * 01 = 2 bytes in xsr[15:0]
2953 * 10 = 3 bytes in xsr[23:0]
2954 * 11 = 4 bytes in xsr[31:0]
2955 * xctrl[16] 1 = enable terminal count, 0=disabled
2956 * xctrl[15:0] receive terminal count for fixed length packets
2957 * value is count minus one (0 = 1 byte packet)
2958 * when terminal count is reached, receiver
2959 * automatically returns to hunt mode and receive
2960 * FIFO contents are flushed to DMA buffers with
2961 * end of frame (EOF) status
2962 */
2963static int set_xctrl(struct slgt_info *info, int xctrl)
2964{
2965 unsigned long flags;
2966
2967 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2968 spin_lock_irqsave(&info->lock, flags);
2969 info->xctrl = xctrl;
2970 wr_reg32(info, XCR, xctrl);
2971 spin_unlock_irqrestore(&info->lock, flags);
2972 return 0;
2973}
2974
2975/*
2976 * set general purpose IO pin state and direction
2977 *
2978 * user_gpio fields:
2979 * state each bit indicates a pin state
2980 * smask set bit indicates pin state to set
2981 * dir each bit indicates a pin direction (0=input, 1=output)
2982 * dmask set bit indicates pin direction to set
2983 */
2984static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2985{
2986 unsigned long flags;
2987 struct gpio_desc gpio;
2988 __u32 data;
2989
2990 if (!info->gpio_present)
2991 return -EINVAL;
2992 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2993 return -EFAULT;
2994 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2995 info->device_name, gpio.state, gpio.smask,
2996 gpio.dir, gpio.dmask));
2997
2998 spin_lock_irqsave(&info->port_array[0]->lock, flags);
2999 if (gpio.dmask) {
3000 data = rd_reg32(info, IODR);
3001 data |= gpio.dmask & gpio.dir;
3002 data &= ~(gpio.dmask & ~gpio.dir);
3003 wr_reg32(info, IODR, data);
3004 }
3005 if (gpio.smask) {
3006 data = rd_reg32(info, IOVR);
3007 data |= gpio.smask & gpio.state;
3008 data &= ~(gpio.smask & ~gpio.state);
3009 wr_reg32(info, IOVR, data);
3010 }
3011 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3012
3013 return 0;
3014}
3015
3016/*
3017 * get general purpose IO pin state and direction
3018 */
3019static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3020{
3021 struct gpio_desc gpio;
3022 if (!info->gpio_present)
3023 return -EINVAL;
3024 gpio.state = rd_reg32(info, IOVR);
3025 gpio.smask = 0xffffffff;
3026 gpio.dir = rd_reg32(info, IODR);
3027 gpio.dmask = 0xffffffff;
3028 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3029 return -EFAULT;
3030 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
3031 info->device_name, gpio.state, gpio.dir));
3032 return 0;
3033}
3034
3035/*
3036 * conditional wait facility
3037 */
3038static void init_cond_wait(struct cond_wait *w, unsigned int data)
3039{
3040 init_waitqueue_head(&w->q);
3041 init_waitqueue_entry(&w->wait, current);
3042 w->data = data;
3043}
3044
3045static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
3046{
3047 set_current_state(TASK_INTERRUPTIBLE);
3048 add_wait_queue(&w->q, &w->wait);
3049 w->next = *head;
3050 *head = w;
3051}
3052
3053static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
3054{
3055 struct cond_wait *w, *prev;
3056 remove_wait_queue(&cw->q, &cw->wait);
3057 set_current_state(TASK_RUNNING);
3058 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
3059 if (w == cw) {
3060 if (prev != NULL)
3061 prev->next = w->next;
3062 else
3063 *head = w->next;
3064 break;
3065 }
3066 }
3067}
3068
3069static void flush_cond_wait(struct cond_wait **head)
3070{
3071 while (*head != NULL) {
3072 wake_up_interruptible(&(*head)->q);
3073 *head = (*head)->next;
3074 }
3075}
3076
3077/*
3078 * wait for general purpose I/O pin(s) to enter specified state
3079 *
3080 * user_gpio fields:
3081 * state - bit indicates target pin state
3082 * smask - set bit indicates watched pin
3083 *
3084 * The wait ends when at least one watched pin enters the specified
3085 * state. When 0 (no error) is returned, user_gpio->state is set to the
3086 * state of all GPIO pins when the wait ends.
3087 *
3088 * Note: Each pin may be a dedicated input, dedicated output, or
3089 * configurable input/output. The number and configuration of pins
3090 * varies with the specific adapter model. Only input pins (dedicated
3091 * or configured) can be monitored with this function.
3092 */
3093static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3094{
3095 unsigned long flags;
3096 int rc = 0;
3097 struct gpio_desc gpio;
3098 struct cond_wait wait;
3099 u32 state;
3100
3101 if (!info->gpio_present)
3102 return -EINVAL;
3103 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
3104 return -EFAULT;
3105 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
3106 info->device_name, gpio.state, gpio.smask));
3107 /* ignore output pins identified by set IODR bit */
3108 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
3109 return -EINVAL;
3110 init_cond_wait(&wait, gpio.smask);
3111
3112 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3113 /* enable interrupts for watched pins */
3114 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3115 /* get current pin states */
3116 state = rd_reg32(info, IOVR);
3117
3118 if (gpio.smask & ~(state ^ gpio.state)) {
3119 /* already in target state */
3120 gpio.state = state;
3121 } else {
3122 /* wait for target state */
3123 add_cond_wait(&info->gpio_wait_q, &wait);
3124 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3125 schedule();
3126 if (signal_pending(current))
3127 rc = -ERESTARTSYS;
3128 else
3129 gpio.state = wait.data;
3130 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3131 remove_cond_wait(&info->gpio_wait_q, &wait);
3132 }
3133
3134 /* disable all GPIO interrupts if no waiting processes */
3135 if (info->gpio_wait_q == NULL)
3136 wr_reg32(info, IOER, 0);
3137 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3138
3139 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3140 rc = -EFAULT;
3141 return rc;
3142}
3143
3144static int modem_input_wait(struct slgt_info *info,int arg)
3145{
3146 unsigned long flags;
3147 int rc;
3148 struct mgsl_icount cprev, cnow;
3149 DECLARE_WAITQUEUE(wait, current);
3150
3151 /* save current irq counts */
3152 spin_lock_irqsave(&info->lock,flags);
3153 cprev = info->icount;
3154 add_wait_queue(&info->status_event_wait_q, &wait);
3155 set_current_state(TASK_INTERRUPTIBLE);
3156 spin_unlock_irqrestore(&info->lock,flags);
3157
3158 for(;;) {
3159 schedule();
3160 if (signal_pending(current)) {
3161 rc = -ERESTARTSYS;
3162 break;
3163 }
3164
3165 /* get new irq counts */
3166 spin_lock_irqsave(&info->lock,flags);
3167 cnow = info->icount;
3168 set_current_state(TASK_INTERRUPTIBLE);
3169 spin_unlock_irqrestore(&info->lock,flags);
3170
3171 /* if no change, wait aborted for some reason */
3172 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3173 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3174 rc = -EIO;
3175 break;
3176 }
3177
3178 /* check for change in caller specified modem input */
3179 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3180 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3181 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3182 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3183 rc = 0;
3184 break;
3185 }
3186
3187 cprev = cnow;
3188 }
3189 remove_wait_queue(&info->status_event_wait_q, &wait);
3190 set_current_state(TASK_RUNNING);
3191 return rc;
3192}
3193
3194/*
3195 * return state of serial control and status signals
3196 */
3197static int tiocmget(struct tty_struct *tty)
3198{
3199 struct slgt_info *info = tty->driver_data;
3200 unsigned int result;
3201 unsigned long flags;
3202
3203 spin_lock_irqsave(&info->lock,flags);
3204 get_signals(info);
3205 spin_unlock_irqrestore(&info->lock,flags);
3206
3207 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3208 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3209 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3210 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3211 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3212 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3213
3214 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3215 return result;
3216}
3217
3218/*
3219 * set modem control signals (DTR/RTS)
3220 *
3221 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3222 * TIOCMSET = set/clear signal values
3223 * value bit mask for command
3224 */
3225static int tiocmset(struct tty_struct *tty,
3226 unsigned int set, unsigned int clear)
3227{
3228 struct slgt_info *info = tty->driver_data;
3229 unsigned long flags;
3230
3231 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3232
3233 if (set & TIOCM_RTS)
3234 info->signals |= SerialSignal_RTS;
3235 if (set & TIOCM_DTR)
3236 info->signals |= SerialSignal_DTR;
3237 if (clear & TIOCM_RTS)
3238 info->signals &= ~SerialSignal_RTS;
3239 if (clear & TIOCM_DTR)
3240 info->signals &= ~SerialSignal_DTR;
3241
3242 spin_lock_irqsave(&info->lock,flags);
3243 set_signals(info);
3244 spin_unlock_irqrestore(&info->lock,flags);
3245 return 0;
3246}
3247
3248static int carrier_raised(struct tty_port *port)
3249{
3250 unsigned long flags;
3251 struct slgt_info *info = container_of(port, struct slgt_info, port);
3252
3253 spin_lock_irqsave(&info->lock,flags);
3254 get_signals(info);
3255 spin_unlock_irqrestore(&info->lock,flags);
3256 return (info->signals & SerialSignal_DCD) ? 1 : 0;
3257}
3258
3259static void dtr_rts(struct tty_port *port, int on)
3260{
3261 unsigned long flags;
3262 struct slgt_info *info = container_of(port, struct slgt_info, port);
3263
3264 spin_lock_irqsave(&info->lock,flags);
3265 if (on)
3266 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3267 else
3268 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3269 set_signals(info);
3270 spin_unlock_irqrestore(&info->lock,flags);
3271}
3272
3273
3274/*
3275 * block current process until the device is ready to open
3276 */
3277static int block_til_ready(struct tty_struct *tty, struct file *filp,
3278 struct slgt_info *info)
3279{
3280 DECLARE_WAITQUEUE(wait, current);
3281 int retval;
3282 bool do_clocal = false;
3283 bool extra_count = false;
3284 unsigned long flags;
3285 int cd;
3286 struct tty_port *port = &info->port;
3287
3288 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3289
3290 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3291 /* nonblock mode is set or port is not enabled */
3292 port->flags |= ASYNC_NORMAL_ACTIVE;
3293 return 0;
3294 }
3295
3296 if (tty->termios->c_cflag & CLOCAL)
3297 do_clocal = true;
3298
3299 /* Wait for carrier detect and the line to become
3300 * free (i.e., not in use by the callout). While we are in
3301 * this loop, port->count is dropped by one, so that
3302 * close() knows when to free things. We restore it upon
3303 * exit, either normal or abnormal.
3304 */
3305
3306 retval = 0;
3307 add_wait_queue(&port->open_wait, &wait);
3308
3309 spin_lock_irqsave(&info->lock, flags);
3310 if (!tty_hung_up_p(filp)) {
3311 extra_count = true;
3312 port->count--;
3313 }
3314 spin_unlock_irqrestore(&info->lock, 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 cd = tty_port_carrier_raised(port);
3330
3331 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
3332 break;
3333
3334 if (signal_pending(current)) {
3335 retval = -ERESTARTSYS;
3336 break;
3337 }
3338
3339 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3340 tty_unlock();
3341 schedule();
3342 tty_lock();
3343 }
3344
3345 set_current_state(TASK_RUNNING);
3346 remove_wait_queue(&port->open_wait, &wait);
3347
3348 if (extra_count)
3349 port->count++;
3350 port->blocked_open--;
3351
3352 if (!retval)
3353 port->flags |= ASYNC_NORMAL_ACTIVE;
3354
3355 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3356 return retval;
3357}
3358
3359static int alloc_tmp_rbuf(struct slgt_info *info)
3360{
3361 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3362 if (info->tmp_rbuf == NULL)
3363 return -ENOMEM;
3364 return 0;
3365}
3366
3367static void free_tmp_rbuf(struct slgt_info *info)
3368{
3369 kfree(info->tmp_rbuf);
3370 info->tmp_rbuf = NULL;
3371}
3372
3373/*
3374 * allocate DMA descriptor lists.
3375 */
3376static int alloc_desc(struct slgt_info *info)
3377{
3378 unsigned int i;
3379 unsigned int pbufs;
3380
3381 /* allocate memory to hold descriptor lists */
3382 info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3383 if (info->bufs == NULL)
3384 return -ENOMEM;
3385
3386 memset(info->bufs, 0, DESC_LIST_SIZE);
3387
3388 info->rbufs = (struct slgt_desc*)info->bufs;
3389 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3390
3391 pbufs = (unsigned int)info->bufs_dma_addr;
3392
3393 /*
3394 * Build circular lists of descriptors
3395 */
3396
3397 for (i=0; i < info->rbuf_count; i++) {
3398 /* physical address of this descriptor */
3399 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3400
3401 /* physical address of next descriptor */
3402 if (i == info->rbuf_count - 1)
3403 info->rbufs[i].next = cpu_to_le32(pbufs);
3404 else
3405 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3406 set_desc_count(info->rbufs[i], DMABUFSIZE);
3407 }
3408
3409 for (i=0; i < info->tbuf_count; i++) {
3410 /* physical address of this descriptor */
3411 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3412
3413 /* physical address of next descriptor */
3414 if (i == info->tbuf_count - 1)
3415 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3416 else
3417 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3418 }
3419
3420 return 0;
3421}
3422
3423static void free_desc(struct slgt_info *info)
3424{
3425 if (info->bufs != NULL) {
3426 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3427 info->bufs = NULL;
3428 info->rbufs = NULL;
3429 info->tbufs = NULL;
3430 }
3431}
3432
3433static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3434{
3435 int i;
3436 for (i=0; i < count; i++) {
3437 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3438 return -ENOMEM;
3439 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3440 }
3441 return 0;
3442}
3443
3444static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3445{
3446 int i;
3447 for (i=0; i < count; i++) {
3448 if (bufs[i].buf == NULL)
3449 continue;
3450 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3451 bufs[i].buf = NULL;
3452 }
3453}
3454
3455static int alloc_dma_bufs(struct slgt_info *info)
3456{
3457 info->rbuf_count = 32;
3458 info->tbuf_count = 32;
3459
3460 if (alloc_desc(info) < 0 ||
3461 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3462 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3463 alloc_tmp_rbuf(info) < 0) {
3464 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3465 return -ENOMEM;
3466 }
3467 reset_rbufs(info);
3468 return 0;
3469}
3470
3471static void free_dma_bufs(struct slgt_info *info)
3472{
3473 if (info->bufs) {
3474 free_bufs(info, info->rbufs, info->rbuf_count);
3475 free_bufs(info, info->tbufs, info->tbuf_count);
3476 free_desc(info);
3477 }
3478 free_tmp_rbuf(info);
3479}
3480
3481static int claim_resources(struct slgt_info *info)
3482{
3483 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3484 DBGERR(("%s reg addr conflict, addr=%08X\n",
3485 info->device_name, info->phys_reg_addr));
3486 info->init_error = DiagStatus_AddressConflict;
3487 goto errout;
3488 }
3489 else
3490 info->reg_addr_requested = true;
3491
3492 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3493 if (!info->reg_addr) {
3494 DBGERR(("%s can't map device registers, addr=%08X\n",
3495 info->device_name, info->phys_reg_addr));
3496 info->init_error = DiagStatus_CantAssignPciResources;
3497 goto errout;
3498 }
3499 return 0;
3500
3501errout:
3502 release_resources(info);
3503 return -ENODEV;
3504}
3505
3506static void release_resources(struct slgt_info *info)
3507{
3508 if (info->irq_requested) {
3509 free_irq(info->irq_level, info);
3510 info->irq_requested = false;
3511 }
3512
3513 if (info->reg_addr_requested) {
3514 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3515 info->reg_addr_requested = false;
3516 }
3517
3518 if (info->reg_addr) {
3519 iounmap(info->reg_addr);
3520 info->reg_addr = NULL;
3521 }
3522}
3523
3524/* Add the specified device instance data structure to the
3525 * global linked list of devices and increment the device count.
3526 */
3527static void add_device(struct slgt_info *info)
3528{
3529 char *devstr;
3530
3531 info->next_device = NULL;
3532 info->line = slgt_device_count;
3533 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3534
3535 if (info->line < MAX_DEVICES) {
3536 if (maxframe[info->line])
3537 info->max_frame_size = maxframe[info->line];
3538 }
3539
3540 slgt_device_count++;
3541
3542 if (!slgt_device_list)
3543 slgt_device_list = info;
3544 else {
3545 struct slgt_info *current_dev = slgt_device_list;
3546 while(current_dev->next_device)
3547 current_dev = current_dev->next_device;
3548 current_dev->next_device = info;
3549 }
3550
3551 if (info->max_frame_size < 4096)
3552 info->max_frame_size = 4096;
3553 else if (info->max_frame_size > 65535)
3554 info->max_frame_size = 65535;
3555
3556 switch(info->pdev->device) {
3557 case SYNCLINK_GT_DEVICE_ID:
3558 devstr = "GT";
3559 break;
3560 case SYNCLINK_GT2_DEVICE_ID:
3561 devstr = "GT2";
3562 break;
3563 case SYNCLINK_GT4_DEVICE_ID:
3564 devstr = "GT4";
3565 break;
3566 case SYNCLINK_AC_DEVICE_ID:
3567 devstr = "AC";
3568 info->params.mode = MGSL_MODE_ASYNC;
3569 break;
3570 default:
3571 devstr = "(unknown model)";
3572 }
3573 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3574 devstr, info->device_name, info->phys_reg_addr,
3575 info->irq_level, info->max_frame_size);
3576
3577#if SYNCLINK_GENERIC_HDLC
3578 hdlcdev_init(info);
3579#endif
3580}
3581
3582static const struct tty_port_operations slgt_port_ops = {
3583 .carrier_raised = carrier_raised,
3584 .dtr_rts = dtr_rts,
3585};
3586
3587/*
3588 * allocate device instance structure, return NULL on failure
3589 */
3590static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3591{
3592 struct slgt_info *info;
3593
3594 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3595
3596 if (!info) {
3597 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3598 driver_name, adapter_num, port_num));
3599 } else {
3600 tty_port_init(&info->port);
3601 info->port.ops = &slgt_port_ops;
3602 info->magic = MGSL_MAGIC;
3603 INIT_WORK(&info->task, bh_handler);
3604 info->max_frame_size = 4096;
3605 info->base_clock = 14745600;
3606 info->rbuf_fill_level = DMABUFSIZE;
3607 info->port.close_delay = 5*HZ/10;
3608 info->port.closing_wait = 30*HZ;
3609 init_waitqueue_head(&info->status_event_wait_q);
3610 init_waitqueue_head(&info->event_wait_q);
3611 spin_lock_init(&info->netlock);
3612 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3613 info->idle_mode = HDLC_TXIDLE_FLAGS;
3614 info->adapter_num = adapter_num;
3615 info->port_num = port_num;
3616
3617 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3618 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3619
3620 /* Copy configuration info to device instance data */
3621 info->pdev = pdev;
3622 info->irq_level = pdev->irq;
3623 info->phys_reg_addr = pci_resource_start(pdev,0);
3624
3625 info->bus_type = MGSL_BUS_TYPE_PCI;
3626 info->irq_flags = IRQF_SHARED;
3627
3628 info->init_error = -1; /* assume error, set to 0 on successful init */
3629 }
3630
3631 return info;
3632}
3633
3634static void device_init(int adapter_num, struct pci_dev *pdev)
3635{
3636 struct slgt_info *port_array[SLGT_MAX_PORTS];
3637 int i;
3638 int port_count = 1;
3639
3640 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3641 port_count = 2;
3642 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3643 port_count = 4;
3644
3645 /* allocate device instances for all ports */
3646 for (i=0; i < port_count; ++i) {
3647 port_array[i] = alloc_dev(adapter_num, i, pdev);
3648 if (port_array[i] == NULL) {
3649 for (--i; i >= 0; --i)
3650 kfree(port_array[i]);
3651 return;
3652 }
3653 }
3654
3655 /* give copy of port_array to all ports and add to device list */
3656 for (i=0; i < port_count; ++i) {
3657 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3658 add_device(port_array[i]);
3659 port_array[i]->port_count = port_count;
3660 spin_lock_init(&port_array[i]->lock);
3661 }
3662
3663 /* Allocate and claim adapter resources */
3664 if (!claim_resources(port_array[0])) {
3665
3666 alloc_dma_bufs(port_array[0]);
3667
3668 /* copy resource information from first port to others */
3669 for (i = 1; i < port_count; ++i) {
3670 port_array[i]->irq_level = port_array[0]->irq_level;
3671 port_array[i]->reg_addr = port_array[0]->reg_addr;
3672 alloc_dma_bufs(port_array[i]);
3673 }
3674
3675 if (request_irq(port_array[0]->irq_level,
3676 slgt_interrupt,
3677 port_array[0]->irq_flags,
3678 port_array[0]->device_name,
3679 port_array[0]) < 0) {
3680 DBGERR(("%s request_irq failed IRQ=%d\n",
3681 port_array[0]->device_name,
3682 port_array[0]->irq_level));
3683 } else {
3684 port_array[0]->irq_requested = true;
3685 adapter_test(port_array[0]);
3686 for (i=1 ; i < port_count ; i++) {
3687 port_array[i]->init_error = port_array[0]->init_error;
3688 port_array[i]->gpio_present = port_array[0]->gpio_present;
3689 }
3690 }
3691 }
3692
3693 for (i=0; i < port_count; ++i)
3694 tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev));
3695}
3696
3697static int __devinit init_one(struct pci_dev *dev,
3698 const struct pci_device_id *ent)
3699{
3700 if (pci_enable_device(dev)) {
3701 printk("error enabling pci device %p\n", dev);
3702 return -EIO;
3703 }
3704 pci_set_master(dev);
3705 device_init(slgt_device_count, dev);
3706 return 0;
3707}
3708
3709static void __devexit remove_one(struct pci_dev *dev)
3710{
3711}
3712
3713static const struct tty_operations ops = {
3714 .open = open,
3715 .close = close,
3716 .write = write,
3717 .put_char = put_char,
3718 .flush_chars = flush_chars,
3719 .write_room = write_room,
3720 .chars_in_buffer = chars_in_buffer,
3721 .flush_buffer = flush_buffer,
3722 .ioctl = ioctl,
3723 .compat_ioctl = slgt_compat_ioctl,
3724 .throttle = throttle,
3725 .unthrottle = unthrottle,
3726 .send_xchar = send_xchar,
3727 .break_ctl = set_break,
3728 .wait_until_sent = wait_until_sent,
3729 .set_termios = set_termios,
3730 .stop = tx_hold,
3731 .start = tx_release,
3732 .hangup = hangup,
3733 .tiocmget = tiocmget,
3734 .tiocmset = tiocmset,
3735 .get_icount = get_icount,
3736 .proc_fops = &synclink_gt_proc_fops,
3737};
3738
3739static void slgt_cleanup(void)
3740{
3741 int rc;
3742 struct slgt_info *info;
3743 struct slgt_info *tmp;
3744
3745 printk(KERN_INFO "unload %s\n", driver_name);
3746
3747 if (serial_driver) {
3748 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3749 tty_unregister_device(serial_driver, info->line);
3750 if ((rc = tty_unregister_driver(serial_driver)))
3751 DBGERR(("tty_unregister_driver error=%d\n", rc));
3752 put_tty_driver(serial_driver);
3753 }
3754
3755 /* reset devices */
3756 info = slgt_device_list;
3757 while(info) {
3758 reset_port(info);
3759 info = info->next_device;
3760 }
3761
3762 /* release devices */
3763 info = slgt_device_list;
3764 while(info) {
3765#if SYNCLINK_GENERIC_HDLC
3766 hdlcdev_exit(info);
3767#endif
3768 free_dma_bufs(info);
3769 free_tmp_rbuf(info);
3770 if (info->port_num == 0)
3771 release_resources(info);
3772 tmp = info;
3773 info = info->next_device;
3774 kfree(tmp);
3775 }
3776
3777 if (pci_registered)
3778 pci_unregister_driver(&pci_driver);
3779}
3780
3781/*
3782 * Driver initialization entry point.
3783 */
3784static int __init slgt_init(void)
3785{
3786 int rc;
3787
3788 printk(KERN_INFO "%s\n", driver_name);
3789
3790 serial_driver = alloc_tty_driver(MAX_DEVICES);
3791 if (!serial_driver) {
3792 printk("%s can't allocate tty driver\n", driver_name);
3793 return -ENOMEM;
3794 }
3795
3796 /* Initialize the tty_driver structure */
3797
3798 serial_driver->owner = THIS_MODULE;
3799 serial_driver->driver_name = tty_driver_name;
3800 serial_driver->name = tty_dev_prefix;
3801 serial_driver->major = ttymajor;
3802 serial_driver->minor_start = 64;
3803 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3804 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3805 serial_driver->init_termios = tty_std_termios;
3806 serial_driver->init_termios.c_cflag =
3807 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3808 serial_driver->init_termios.c_ispeed = 9600;
3809 serial_driver->init_termios.c_ospeed = 9600;
3810 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3811 tty_set_operations(serial_driver, &ops);
3812 if ((rc = tty_register_driver(serial_driver)) < 0) {
3813 DBGERR(("%s can't register serial driver\n", driver_name));
3814 put_tty_driver(serial_driver);
3815 serial_driver = NULL;
3816 goto error;
3817 }
3818
3819 printk(KERN_INFO "%s, tty major#%d\n",
3820 driver_name, serial_driver->major);
3821
3822 slgt_device_count = 0;
3823 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3824 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3825 goto error;
3826 }
3827 pci_registered = true;
3828
3829 if (!slgt_device_list)
3830 printk("%s no devices found\n",driver_name);
3831
3832 return 0;
3833
3834error:
3835 slgt_cleanup();
3836 return rc;
3837}
3838
3839static void __exit slgt_exit(void)
3840{
3841 slgt_cleanup();
3842}
3843
3844module_init(slgt_init);
3845module_exit(slgt_exit);
3846
3847/*
3848 * register access routines
3849 */
3850
3851#define CALC_REGADDR() \
3852 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3853 if (addr >= 0x80) \
3854 reg_addr += (info->port_num) * 32; \
3855 else if (addr >= 0x40) \
3856 reg_addr += (info->port_num) * 16;
3857
3858static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3859{
3860 CALC_REGADDR();
3861 return readb((void __iomem *)reg_addr);
3862}
3863
3864static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3865{
3866 CALC_REGADDR();
3867 writeb(value, (void __iomem *)reg_addr);
3868}
3869
3870static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3871{
3872 CALC_REGADDR();
3873 return readw((void __iomem *)reg_addr);
3874}
3875
3876static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3877{
3878 CALC_REGADDR();
3879 writew(value, (void __iomem *)reg_addr);
3880}
3881
3882static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3883{
3884 CALC_REGADDR();
3885 return readl((void __iomem *)reg_addr);
3886}
3887
3888static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3889{
3890 CALC_REGADDR();
3891 writel(value, (void __iomem *)reg_addr);
3892}
3893
3894static void rdma_reset(struct slgt_info *info)
3895{
3896 unsigned int i;
3897
3898 /* set reset bit */
3899 wr_reg32(info, RDCSR, BIT1);
3900
3901 /* wait for enable bit cleared */
3902 for(i=0 ; i < 1000 ; i++)
3903 if (!(rd_reg32(info, RDCSR) & BIT0))
3904 break;
3905}
3906
3907static void tdma_reset(struct slgt_info *info)
3908{
3909 unsigned int i;
3910
3911 /* set reset bit */
3912 wr_reg32(info, TDCSR, BIT1);
3913
3914 /* wait for enable bit cleared */
3915 for(i=0 ; i < 1000 ; i++)
3916 if (!(rd_reg32(info, TDCSR) & BIT0))
3917 break;
3918}
3919
3920/*
3921 * enable internal loopback
3922 * TxCLK and RxCLK are generated from BRG
3923 * and TxD is looped back to RxD internally.
3924 */
3925static void enable_loopback(struct slgt_info *info)
3926{
3927 /* SCR (serial control) BIT2=looopback enable */
3928 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3929
3930 if (info->params.mode != MGSL_MODE_ASYNC) {
3931 /* CCR (clock control)
3932 * 07..05 tx clock source (010 = BRG)
3933 * 04..02 rx clock source (010 = BRG)
3934 * 01 auxclk enable (0 = disable)
3935 * 00 BRG enable (1 = enable)
3936 *
3937 * 0100 1001
3938 */
3939 wr_reg8(info, CCR, 0x49);
3940
3941 /* set speed if available, otherwise use default */
3942 if (info->params.clock_speed)
3943 set_rate(info, info->params.clock_speed);
3944 else
3945 set_rate(info, 3686400);
3946 }
3947}
3948
3949/*
3950 * set baud rate generator to specified rate
3951 */
3952static void set_rate(struct slgt_info *info, u32 rate)
3953{
3954 unsigned int div;
3955 unsigned int osc = info->base_clock;
3956
3957 /* div = osc/rate - 1
3958 *
3959 * Round div up if osc/rate is not integer to
3960 * force to next slowest rate.
3961 */
3962
3963 if (rate) {
3964 div = osc/rate;
3965 if (!(osc % rate) && div)
3966 div--;
3967 wr_reg16(info, BDR, (unsigned short)div);
3968 }
3969}
3970
3971static void rx_stop(struct slgt_info *info)
3972{
3973 unsigned short val;
3974
3975 /* disable and reset receiver */
3976 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3977 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3978 wr_reg16(info, RCR, val); /* clear reset bit */
3979
3980 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3981
3982 /* clear pending rx interrupts */
3983 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3984
3985 rdma_reset(info);
3986
3987 info->rx_enabled = false;
3988 info->rx_restart = false;
3989}
3990
3991static void rx_start(struct slgt_info *info)
3992{
3993 unsigned short val;
3994
3995 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3996
3997 /* clear pending rx overrun IRQ */
3998 wr_reg16(info, SSR, IRQ_RXOVER);
3999
4000 /* reset and disable receiver */
4001 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
4002 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
4003 wr_reg16(info, RCR, val); /* clear reset bit */
4004
4005 rdma_reset(info);
4006 reset_rbufs(info);
4007
4008 if (info->rx_pio) {
4009 /* rx request when rx FIFO not empty */
4010 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
4011 slgt_irq_on(info, IRQ_RXDATA);
4012 if (info->params.mode == MGSL_MODE_ASYNC) {
4013 /* enable saving of rx status */
4014 wr_reg32(info, RDCSR, BIT6);
4015 }
4016 } else {
4017 /* rx request when rx FIFO half full */
4018 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
4019 /* set 1st descriptor address */
4020 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
4021
4022 if (info->params.mode != MGSL_MODE_ASYNC) {
4023 /* enable rx DMA and DMA interrupt */
4024 wr_reg32(info, RDCSR, (BIT2 + BIT0));
4025 } else {
4026 /* enable saving of rx status, rx DMA and DMA interrupt */
4027 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
4028 }
4029 }
4030
4031 slgt_irq_on(info, IRQ_RXOVER);
4032
4033 /* enable receiver */
4034 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
4035
4036 info->rx_restart = false;
4037 info->rx_enabled = true;
4038}
4039
4040static void tx_start(struct slgt_info *info)
4041{
4042 if (!info->tx_enabled) {
4043 wr_reg16(info, TCR,
4044 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
4045 info->tx_enabled = true;
4046 }
4047
4048 if (desc_count(info->tbufs[info->tbuf_start])) {
4049 info->drop_rts_on_tx_done = false;
4050
4051 if (info->params.mode != MGSL_MODE_ASYNC) {
4052 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
4053 get_signals(info);
4054 if (!(info->signals & SerialSignal_RTS)) {
4055 info->signals |= SerialSignal_RTS;
4056 set_signals(info);
4057 info->drop_rts_on_tx_done = true;
4058 }
4059 }
4060
4061 slgt_irq_off(info, IRQ_TXDATA);
4062 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
4063 /* clear tx idle and underrun status bits */
4064 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4065 } else {
4066 slgt_irq_off(info, IRQ_TXDATA);
4067 slgt_irq_on(info, IRQ_TXIDLE);
4068 /* clear tx idle status bit */
4069 wr_reg16(info, SSR, IRQ_TXIDLE);
4070 }
4071 /* set 1st descriptor address and start DMA */
4072 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
4073 wr_reg32(info, TDCSR, BIT2 + BIT0);
4074 info->tx_active = true;
4075 }
4076}
4077
4078static void tx_stop(struct slgt_info *info)
4079{
4080 unsigned short val;
4081
4082 del_timer(&info->tx_timer);
4083
4084 tdma_reset(info);
4085
4086 /* reset and disable transmitter */
4087 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
4088 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
4089
4090 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
4091
4092 /* clear tx idle and underrun status bit */
4093 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4094
4095 reset_tbufs(info);
4096
4097 info->tx_enabled = false;
4098 info->tx_active = false;
4099}
4100
4101static void reset_port(struct slgt_info *info)
4102{
4103 if (!info->reg_addr)
4104 return;
4105
4106 tx_stop(info);
4107 rx_stop(info);
4108
4109 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4110 set_signals(info);
4111
4112 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4113}
4114
4115static void reset_adapter(struct slgt_info *info)
4116{
4117 int i;
4118 for (i=0; i < info->port_count; ++i) {
4119 if (info->port_array[i])
4120 reset_port(info->port_array[i]);
4121 }
4122}
4123
4124static void async_mode(struct slgt_info *info)
4125{
4126 unsigned short val;
4127
4128 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4129 tx_stop(info);
4130 rx_stop(info);
4131
4132 /* TCR (tx control)
4133 *
4134 * 15..13 mode, 010=async
4135 * 12..10 encoding, 000=NRZ
4136 * 09 parity enable
4137 * 08 1=odd parity, 0=even parity
4138 * 07 1=RTS driver control
4139 * 06 1=break enable
4140 * 05..04 character length
4141 * 00=5 bits
4142 * 01=6 bits
4143 * 10=7 bits
4144 * 11=8 bits
4145 * 03 0=1 stop bit, 1=2 stop bits
4146 * 02 reset
4147 * 01 enable
4148 * 00 auto-CTS enable
4149 */
4150 val = 0x4000;
4151
4152 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4153 val |= BIT7;
4154
4155 if (info->params.parity != ASYNC_PARITY_NONE) {
4156 val |= BIT9;
4157 if (info->params.parity == ASYNC_PARITY_ODD)
4158 val |= BIT8;
4159 }
4160
4161 switch (info->params.data_bits)
4162 {
4163 case 6: val |= BIT4; break;
4164 case 7: val |= BIT5; break;
4165 case 8: val |= BIT5 + BIT4; break;
4166 }
4167
4168 if (info->params.stop_bits != 1)
4169 val |= BIT3;
4170
4171 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4172 val |= BIT0;
4173
4174 wr_reg16(info, TCR, val);
4175
4176 /* RCR (rx control)
4177 *
4178 * 15..13 mode, 010=async
4179 * 12..10 encoding, 000=NRZ
4180 * 09 parity enable
4181 * 08 1=odd parity, 0=even parity
4182 * 07..06 reserved, must be 0
4183 * 05..04 character length
4184 * 00=5 bits
4185 * 01=6 bits
4186 * 10=7 bits
4187 * 11=8 bits
4188 * 03 reserved, must be zero
4189 * 02 reset
4190 * 01 enable
4191 * 00 auto-DCD enable
4192 */
4193 val = 0x4000;
4194
4195 if (info->params.parity != ASYNC_PARITY_NONE) {
4196 val |= BIT9;
4197 if (info->params.parity == ASYNC_PARITY_ODD)
4198 val |= BIT8;
4199 }
4200
4201 switch (info->params.data_bits)
4202 {
4203 case 6: val |= BIT4; break;
4204 case 7: val |= BIT5; break;
4205 case 8: val |= BIT5 + BIT4; break;
4206 }
4207
4208 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4209 val |= BIT0;
4210
4211 wr_reg16(info, RCR, val);
4212
4213 /* CCR (clock control)
4214 *
4215 * 07..05 011 = tx clock source is BRG/16
4216 * 04..02 010 = rx clock source is BRG
4217 * 01 0 = auxclk disabled
4218 * 00 1 = BRG enabled
4219 *
4220 * 0110 1001
4221 */
4222 wr_reg8(info, CCR, 0x69);
4223
4224 msc_set_vcr(info);
4225
4226 /* SCR (serial control)
4227 *
4228 * 15 1=tx req on FIFO half empty
4229 * 14 1=rx req on FIFO half full
4230 * 13 tx data IRQ enable
4231 * 12 tx idle IRQ enable
4232 * 11 rx break on IRQ enable
4233 * 10 rx data IRQ enable
4234 * 09 rx break off IRQ enable
4235 * 08 overrun IRQ enable
4236 * 07 DSR IRQ enable
4237 * 06 CTS IRQ enable
4238 * 05 DCD IRQ enable
4239 * 04 RI IRQ enable
4240 * 03 0=16x sampling, 1=8x sampling
4241 * 02 1=txd->rxd internal loopback enable
4242 * 01 reserved, must be zero
4243 * 00 1=master IRQ enable
4244 */
4245 val = BIT15 + BIT14 + BIT0;
4246 /* JCR[8] : 1 = x8 async mode feature available */
4247 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4248 ((info->base_clock < (info->params.data_rate * 16)) ||
4249 (info->base_clock % (info->params.data_rate * 16)))) {
4250 /* use 8x sampling */
4251 val |= BIT3;
4252 set_rate(info, info->params.data_rate * 8);
4253 } else {
4254 /* use 16x sampling */
4255 set_rate(info, info->params.data_rate * 16);
4256 }
4257 wr_reg16(info, SCR, val);
4258
4259 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4260
4261 if (info->params.loopback)
4262 enable_loopback(info);
4263}
4264
4265static void sync_mode(struct slgt_info *info)
4266{
4267 unsigned short val;
4268
4269 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4270 tx_stop(info);
4271 rx_stop(info);
4272
4273 /* TCR (tx control)
4274 *
4275 * 15..13 mode
4276 * 000=HDLC/SDLC
4277 * 001=raw bit synchronous
4278 * 010=asynchronous/isochronous
4279 * 011=monosync byte synchronous
4280 * 100=bisync byte synchronous
4281 * 101=xsync byte synchronous
4282 * 12..10 encoding
4283 * 09 CRC enable
4284 * 08 CRC32
4285 * 07 1=RTS driver control
4286 * 06 preamble enable
4287 * 05..04 preamble length
4288 * 03 share open/close flag
4289 * 02 reset
4290 * 01 enable
4291 * 00 auto-CTS enable
4292 */
4293 val = BIT2;
4294
4295 switch(info->params.mode) {
4296 case MGSL_MODE_XSYNC:
4297 val |= BIT15 + BIT13;
4298 break;
4299 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4300 case MGSL_MODE_BISYNC: val |= BIT15; break;
4301 case MGSL_MODE_RAW: val |= BIT13; break;
4302 }
4303 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4304 val |= BIT7;
4305
4306 switch(info->params.encoding)
4307 {
4308 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4309 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4310 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4311 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4312 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4313 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4314 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4315 }
4316
4317 switch (info->params.crc_type & HDLC_CRC_MASK)
4318 {
4319 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4320 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4321 }
4322
4323 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4324 val |= BIT6;
4325
4326 switch (info->params.preamble_length)
4327 {
4328 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4329 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4330 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4331 }
4332
4333 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4334 val |= BIT0;
4335
4336 wr_reg16(info, TCR, val);
4337
4338 /* TPR (transmit preamble) */
4339
4340 switch (info->params.preamble)
4341 {
4342 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4343 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4344 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4345 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4346 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4347 default: val = 0x7e; break;
4348 }
4349 wr_reg8(info, TPR, (unsigned char)val);
4350
4351 /* RCR (rx control)
4352 *
4353 * 15..13 mode
4354 * 000=HDLC/SDLC
4355 * 001=raw bit synchronous
4356 * 010=asynchronous/isochronous
4357 * 011=monosync byte synchronous
4358 * 100=bisync byte synchronous
4359 * 101=xsync byte synchronous
4360 * 12..10 encoding
4361 * 09 CRC enable
4362 * 08 CRC32
4363 * 07..03 reserved, must be 0
4364 * 02 reset
4365 * 01 enable
4366 * 00 auto-DCD enable
4367 */
4368 val = 0;
4369
4370 switch(info->params.mode) {
4371 case MGSL_MODE_XSYNC:
4372 val |= BIT15 + BIT13;
4373 break;
4374 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4375 case MGSL_MODE_BISYNC: val |= BIT15; break;
4376 case MGSL_MODE_RAW: val |= BIT13; break;
4377 }
4378
4379 switch(info->params.encoding)
4380 {
4381 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4382 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4383 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4384 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4385 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4386 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4387 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4388 }
4389
4390 switch (info->params.crc_type & HDLC_CRC_MASK)
4391 {
4392 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4393 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4394 }
4395
4396 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4397 val |= BIT0;
4398
4399 wr_reg16(info, RCR, val);
4400
4401 /* CCR (clock control)
4402 *
4403 * 07..05 tx clock source
4404 * 04..02 rx clock source
4405 * 01 auxclk enable
4406 * 00 BRG enable
4407 */
4408 val = 0;
4409
4410 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4411 {
4412 // when RxC source is DPLL, BRG generates 16X DPLL
4413 // reference clock, so take TxC from BRG/16 to get
4414 // transmit clock at actual data rate
4415 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4416 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4417 else
4418 val |= BIT6; /* 010, txclk = BRG */
4419 }
4420 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4421 val |= BIT7; /* 100, txclk = DPLL Input */
4422 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4423 val |= BIT5; /* 001, txclk = RXC Input */
4424
4425 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4426 val |= BIT3; /* 010, rxclk = BRG */
4427 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4428 val |= BIT4; /* 100, rxclk = DPLL */
4429 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4430 val |= BIT2; /* 001, rxclk = TXC Input */
4431
4432 if (info->params.clock_speed)
4433 val |= BIT1 + BIT0;
4434
4435 wr_reg8(info, CCR, (unsigned char)val);
4436
4437 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4438 {
4439 // program DPLL mode
4440 switch(info->params.encoding)
4441 {
4442 case HDLC_ENCODING_BIPHASE_MARK:
4443 case HDLC_ENCODING_BIPHASE_SPACE:
4444 val = BIT7; break;
4445 case HDLC_ENCODING_BIPHASE_LEVEL:
4446 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4447 val = BIT7 + BIT6; break;
4448 default: val = BIT6; // NRZ encodings
4449 }
4450 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4451
4452 // DPLL requires a 16X reference clock from BRG
4453 set_rate(info, info->params.clock_speed * 16);
4454 }
4455 else
4456 set_rate(info, info->params.clock_speed);
4457
4458 tx_set_idle(info);
4459
4460 msc_set_vcr(info);
4461
4462 /* SCR (serial control)
4463 *
4464 * 15 1=tx req on FIFO half empty
4465 * 14 1=rx req on FIFO half full
4466 * 13 tx data IRQ enable
4467 * 12 tx idle IRQ enable
4468 * 11 underrun IRQ enable
4469 * 10 rx data IRQ enable
4470 * 09 rx idle IRQ enable
4471 * 08 overrun IRQ enable
4472 * 07 DSR IRQ enable
4473 * 06 CTS IRQ enable
4474 * 05 DCD IRQ enable
4475 * 04 RI IRQ enable
4476 * 03 reserved, must be zero
4477 * 02 1=txd->rxd internal loopback enable
4478 * 01 reserved, must be zero
4479 * 00 1=master IRQ enable
4480 */
4481 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4482
4483 if (info->params.loopback)
4484 enable_loopback(info);
4485}
4486
4487/*
4488 * set transmit idle mode
4489 */
4490static void tx_set_idle(struct slgt_info *info)
4491{
4492 unsigned char val;
4493 unsigned short tcr;
4494
4495 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4496 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4497 */
4498 tcr = rd_reg16(info, TCR);
4499 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4500 /* disable preamble, set idle size to 16 bits */
4501 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4502 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4503 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4504 } else if (!(tcr & BIT6)) {
4505 /* preamble is disabled, set idle size to 8 bits */
4506 tcr &= ~(BIT5 + BIT4);
4507 }
4508 wr_reg16(info, TCR, tcr);
4509
4510 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4511 /* LSB of custom tx idle specified in tx idle register */
4512 val = (unsigned char)(info->idle_mode & 0xff);
4513 } else {
4514 /* standard 8 bit idle patterns */
4515 switch(info->idle_mode)
4516 {
4517 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4518 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4519 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4520 case HDLC_TXIDLE_ZEROS:
4521 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4522 default: val = 0xff;
4523 }
4524 }
4525
4526 wr_reg8(info, TIR, val);
4527}
4528
4529/*
4530 * get state of V24 status (input) signals
4531 */
4532static void get_signals(struct slgt_info *info)
4533{
4534 unsigned short status = rd_reg16(info, SSR);
4535
4536 /* clear all serial signals except DTR and RTS */
4537 info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4538
4539 if (status & BIT3)
4540 info->signals |= SerialSignal_DSR;
4541 if (status & BIT2)
4542 info->signals |= SerialSignal_CTS;
4543 if (status & BIT1)
4544 info->signals |= SerialSignal_DCD;
4545 if (status & BIT0)
4546 info->signals |= SerialSignal_RI;
4547}
4548
4549/*
4550 * set V.24 Control Register based on current configuration
4551 */
4552static void msc_set_vcr(struct slgt_info *info)
4553{
4554 unsigned char val = 0;
4555
4556 /* VCR (V.24 control)
4557 *
4558 * 07..04 serial IF select
4559 * 03 DTR
4560 * 02 RTS
4561 * 01 LL
4562 * 00 RL
4563 */
4564
4565 switch(info->if_mode & MGSL_INTERFACE_MASK)
4566 {
4567 case MGSL_INTERFACE_RS232:
4568 val |= BIT5; /* 0010 */
4569 break;
4570 case MGSL_INTERFACE_V35:
4571 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4572 break;
4573 case MGSL_INTERFACE_RS422:
4574 val |= BIT6; /* 0100 */
4575 break;
4576 }
4577
4578 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4579 val |= BIT4;
4580 if (info->signals & SerialSignal_DTR)
4581 val |= BIT3;
4582 if (info->signals & SerialSignal_RTS)
4583 val |= BIT2;
4584 if (info->if_mode & MGSL_INTERFACE_LL)
4585 val |= BIT1;
4586 if (info->if_mode & MGSL_INTERFACE_RL)
4587 val |= BIT0;
4588 wr_reg8(info, VCR, val);
4589}
4590
4591/*
4592 * set state of V24 control (output) signals
4593 */
4594static void set_signals(struct slgt_info *info)
4595{
4596 unsigned char val = rd_reg8(info, VCR);
4597 if (info->signals & SerialSignal_DTR)
4598 val |= BIT3;
4599 else
4600 val &= ~BIT3;
4601 if (info->signals & SerialSignal_RTS)
4602 val |= BIT2;
4603 else
4604 val &= ~BIT2;
4605 wr_reg8(info, VCR, val);
4606}
4607
4608/*
4609 * free range of receive DMA buffers (i to last)
4610 */
4611static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4612{
4613 int done = 0;
4614
4615 while(!done) {
4616 /* reset current buffer for reuse */
4617 info->rbufs[i].status = 0;
4618 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4619 if (i == last)
4620 done = 1;
4621 if (++i == info->rbuf_count)
4622 i = 0;
4623 }
4624 info->rbuf_current = i;
4625}
4626
4627/*
4628 * mark all receive DMA buffers as free
4629 */
4630static void reset_rbufs(struct slgt_info *info)
4631{
4632 free_rbufs(info, 0, info->rbuf_count - 1);
4633 info->rbuf_fill_index = 0;
4634 info->rbuf_fill_count = 0;
4635}
4636
4637/*
4638 * pass receive HDLC frame to upper layer
4639 *
4640 * return true if frame available, otherwise false
4641 */
4642static bool rx_get_frame(struct slgt_info *info)
4643{
4644 unsigned int start, end;
4645 unsigned short status;
4646 unsigned int framesize = 0;
4647 unsigned long flags;
4648 struct tty_struct *tty = info->port.tty;
4649 unsigned char addr_field = 0xff;
4650 unsigned int crc_size = 0;
4651
4652 switch (info->params.crc_type & HDLC_CRC_MASK) {
4653 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4654 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4655 }
4656
4657check_again:
4658
4659 framesize = 0;
4660 addr_field = 0xff;
4661 start = end = info->rbuf_current;
4662
4663 for (;;) {
4664 if (!desc_complete(info->rbufs[end]))
4665 goto cleanup;
4666
4667 if (framesize == 0 && info->params.addr_filter != 0xff)
4668 addr_field = info->rbufs[end].buf[0];
4669
4670 framesize += desc_count(info->rbufs[end]);
4671
4672 if (desc_eof(info->rbufs[end]))
4673 break;
4674
4675 if (++end == info->rbuf_count)
4676 end = 0;
4677
4678 if (end == info->rbuf_current) {
4679 if (info->rx_enabled){
4680 spin_lock_irqsave(&info->lock,flags);
4681 rx_start(info);
4682 spin_unlock_irqrestore(&info->lock,flags);
4683 }
4684 goto cleanup;
4685 }
4686 }
4687
4688 /* status
4689 *
4690 * 15 buffer complete
4691 * 14..06 reserved
4692 * 05..04 residue
4693 * 02 eof (end of frame)
4694 * 01 CRC error
4695 * 00 abort
4696 */
4697 status = desc_status(info->rbufs[end]);
4698
4699 /* ignore CRC bit if not using CRC (bit is undefined) */
4700 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4701 status &= ~BIT1;
4702
4703 if (framesize == 0 ||
4704 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4705 free_rbufs(info, start, end);
4706 goto check_again;
4707 }
4708
4709 if (framesize < (2 + crc_size) || status & BIT0) {
4710 info->icount.rxshort++;
4711 framesize = 0;
4712 } else if (status & BIT1) {
4713 info->icount.rxcrc++;
4714 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4715 framesize = 0;
4716 }
4717
4718#if SYNCLINK_GENERIC_HDLC
4719 if (framesize == 0) {
4720 info->netdev->stats.rx_errors++;
4721 info->netdev->stats.rx_frame_errors++;
4722 }
4723#endif
4724
4725 DBGBH(("%s rx frame status=%04X size=%d\n",
4726 info->device_name, status, framesize));
4727 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4728
4729 if (framesize) {
4730 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4731 framesize -= crc_size;
4732 crc_size = 0;
4733 }
4734
4735 if (framesize > info->max_frame_size + crc_size)
4736 info->icount.rxlong++;
4737 else {
4738 /* copy dma buffer(s) to contiguous temp buffer */
4739 int copy_count = framesize;
4740 int i = start;
4741 unsigned char *p = info->tmp_rbuf;
4742 info->tmp_rbuf_count = framesize;
4743
4744 info->icount.rxok++;
4745
4746 while(copy_count) {
4747 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4748 memcpy(p, info->rbufs[i].buf, partial_count);
4749 p += partial_count;
4750 copy_count -= partial_count;
4751 if (++i == info->rbuf_count)
4752 i = 0;
4753 }
4754
4755 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4756 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4757 framesize++;
4758 }
4759
4760#if SYNCLINK_GENERIC_HDLC
4761 if (info->netcount)
4762 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4763 else
4764#endif
4765 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4766 }
4767 }
4768 free_rbufs(info, start, end);
4769 return true;
4770
4771cleanup:
4772 return false;
4773}
4774
4775/*
4776 * pass receive buffer (RAW synchronous mode) to tty layer
4777 * return true if buffer available, otherwise false
4778 */
4779static bool rx_get_buf(struct slgt_info *info)
4780{
4781 unsigned int i = info->rbuf_current;
4782 unsigned int count;
4783
4784 if (!desc_complete(info->rbufs[i]))
4785 return false;
4786 count = desc_count(info->rbufs[i]);
4787 switch(info->params.mode) {
4788 case MGSL_MODE_MONOSYNC:
4789 case MGSL_MODE_BISYNC:
4790 case MGSL_MODE_XSYNC:
4791 /* ignore residue in byte synchronous modes */
4792 if (desc_residue(info->rbufs[i]))
4793 count--;
4794 break;
4795 }
4796 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4797 DBGINFO(("rx_get_buf size=%d\n", count));
4798 if (count)
4799 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4800 info->flag_buf, count);
4801 free_rbufs(info, i, i);
4802 return true;
4803}
4804
4805static void reset_tbufs(struct slgt_info *info)
4806{
4807 unsigned int i;
4808 info->tbuf_current = 0;
4809 for (i=0 ; i < info->tbuf_count ; i++) {
4810 info->tbufs[i].status = 0;
4811 info->tbufs[i].count = 0;
4812 }
4813}
4814
4815/*
4816 * return number of free transmit DMA buffers
4817 */
4818static unsigned int free_tbuf_count(struct slgt_info *info)
4819{
4820 unsigned int count = 0;
4821 unsigned int i = info->tbuf_current;
4822
4823 do
4824 {
4825 if (desc_count(info->tbufs[i]))
4826 break; /* buffer in use */
4827 ++count;
4828 if (++i == info->tbuf_count)
4829 i=0;
4830 } while (i != info->tbuf_current);
4831
4832 /* if tx DMA active, last zero count buffer is in use */
4833 if (count && (rd_reg32(info, TDCSR) & BIT0))
4834 --count;
4835
4836 return count;
4837}
4838
4839/*
4840 * return number of bytes in unsent transmit DMA buffers
4841 * and the serial controller tx FIFO
4842 */
4843static unsigned int tbuf_bytes(struct slgt_info *info)
4844{
4845 unsigned int total_count = 0;
4846 unsigned int i = info->tbuf_current;
4847 unsigned int reg_value;
4848 unsigned int count;
4849 unsigned int active_buf_count = 0;
4850
4851 /*
4852 * Add descriptor counts for all tx DMA buffers.
4853 * If count is zero (cleared by DMA controller after read),
4854 * the buffer is complete or is actively being read from.
4855 *
4856 * Record buf_count of last buffer with zero count starting
4857 * from current ring position. buf_count is mirror
4858 * copy of count and is not cleared by serial controller.
4859 * If DMA controller is active, that buffer is actively
4860 * being read so add to total.
4861 */
4862 do {
4863 count = desc_count(info->tbufs[i]);
4864 if (count)
4865 total_count += count;
4866 else if (!total_count)
4867 active_buf_count = info->tbufs[i].buf_count;
4868 if (++i == info->tbuf_count)
4869 i = 0;
4870 } while (i != info->tbuf_current);
4871
4872 /* read tx DMA status register */
4873 reg_value = rd_reg32(info, TDCSR);
4874
4875 /* if tx DMA active, last zero count buffer is in use */
4876 if (reg_value & BIT0)
4877 total_count += active_buf_count;
4878
4879 /* add tx FIFO count = reg_value[15..8] */
4880 total_count += (reg_value >> 8) & 0xff;
4881
4882 /* if transmitter active add one byte for shift register */
4883 if (info->tx_active)
4884 total_count++;
4885
4886 return total_count;
4887}
4888
4889/*
4890 * load data into transmit DMA buffer ring and start transmitter if needed
4891 * return true if data accepted, otherwise false (buffers full)
4892 */
4893static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4894{
4895 unsigned short count;
4896 unsigned int i;
4897 struct slgt_desc *d;
4898
4899 /* check required buffer space */
4900 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
4901 return false;
4902
4903 DBGDATA(info, buf, size, "tx");
4904
4905 /*
4906 * copy data to one or more DMA buffers in circular ring
4907 * tbuf_start = first buffer for this data
4908 * tbuf_current = next free buffer
4909 *
4910 * Copy all data before making data visible to DMA controller by
4911 * setting descriptor count of the first buffer.
4912 * This prevents an active DMA controller from reading the first DMA
4913 * buffers of a frame and stopping before the final buffers are filled.
4914 */
4915
4916 info->tbuf_start = i = info->tbuf_current;
4917
4918 while (size) {
4919 d = &info->tbufs[i];
4920
4921 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4922 memcpy(d->buf, buf, count);
4923
4924 size -= count;
4925 buf += count;
4926
4927 /*
4928 * set EOF bit for last buffer of HDLC frame or
4929 * for every buffer in raw mode
4930 */
4931 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4932 info->params.mode == MGSL_MODE_RAW)
4933 set_desc_eof(*d, 1);
4934 else
4935 set_desc_eof(*d, 0);
4936
4937 /* set descriptor count for all but first buffer */
4938 if (i != info->tbuf_start)
4939 set_desc_count(*d, count);
4940 d->buf_count = count;
4941
4942 if (++i == info->tbuf_count)
4943 i = 0;
4944 }
4945
4946 info->tbuf_current = i;
4947
4948 /* set first buffer count to make new data visible to DMA controller */
4949 d = &info->tbufs[info->tbuf_start];
4950 set_desc_count(*d, d->buf_count);
4951
4952 /* start transmitter if needed and update transmit timeout */
4953 if (!info->tx_active)
4954 tx_start(info);
4955 update_tx_timer(info);
4956
4957 return true;
4958}
4959
4960static int register_test(struct slgt_info *info)
4961{
4962 static unsigned short patterns[] =
4963 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4964 static unsigned int count = ARRAY_SIZE(patterns);
4965 unsigned int i;
4966 int rc = 0;
4967
4968 for (i=0 ; i < count ; i++) {
4969 wr_reg16(info, TIR, patterns[i]);
4970 wr_reg16(info, BDR, patterns[(i+1)%count]);
4971 if ((rd_reg16(info, TIR) != patterns[i]) ||
4972 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4973 rc = -ENODEV;
4974 break;
4975 }
4976 }
4977 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4978 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4979 return rc;
4980}
4981
4982static int irq_test(struct slgt_info *info)
4983{
4984 unsigned long timeout;
4985 unsigned long flags;
4986 struct tty_struct *oldtty = info->port.tty;
4987 u32 speed = info->params.data_rate;
4988
4989 info->params.data_rate = 921600;
4990 info->port.tty = NULL;
4991
4992 spin_lock_irqsave(&info->lock, flags);
4993 async_mode(info);
4994 slgt_irq_on(info, IRQ_TXIDLE);
4995
4996 /* enable transmitter */
4997 wr_reg16(info, TCR,
4998 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4999
5000 /* write one byte and wait for tx idle */
5001 wr_reg16(info, TDR, 0);
5002
5003 /* assume failure */
5004 info->init_error = DiagStatus_IrqFailure;
5005 info->irq_occurred = false;
5006
5007 spin_unlock_irqrestore(&info->lock, flags);
5008
5009 timeout=100;
5010 while(timeout-- && !info->irq_occurred)
5011 msleep_interruptible(10);
5012
5013 spin_lock_irqsave(&info->lock,flags);
5014 reset_port(info);
5015 spin_unlock_irqrestore(&info->lock,flags);
5016
5017 info->params.data_rate = speed;
5018 info->port.tty = oldtty;
5019
5020 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
5021 return info->irq_occurred ? 0 : -ENODEV;
5022}
5023
5024static int loopback_test_rx(struct slgt_info *info)
5025{
5026 unsigned char *src, *dest;
5027 int count;
5028
5029 if (desc_complete(info->rbufs[0])) {
5030 count = desc_count(info->rbufs[0]);
5031 src = info->rbufs[0].buf;
5032 dest = info->tmp_rbuf;
5033
5034 for( ; count ; count-=2, src+=2) {
5035 /* src=data byte (src+1)=status byte */
5036 if (!(*(src+1) & (BIT9 + BIT8))) {
5037 *dest = *src;
5038 dest++;
5039 info->tmp_rbuf_count++;
5040 }
5041 }
5042 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
5043 return 1;
5044 }
5045 return 0;
5046}
5047
5048static int loopback_test(struct slgt_info *info)
5049{
5050#define TESTFRAMESIZE 20
5051
5052 unsigned long timeout;
5053 u16 count = TESTFRAMESIZE;
5054 unsigned char buf[TESTFRAMESIZE];
5055 int rc = -ENODEV;
5056 unsigned long flags;
5057
5058 struct tty_struct *oldtty = info->port.tty;
5059 MGSL_PARAMS params;
5060
5061 memcpy(¶ms, &info->params, sizeof(params));
5062
5063 info->params.mode = MGSL_MODE_ASYNC;
5064 info->params.data_rate = 921600;
5065 info->params.loopback = 1;
5066 info->port.tty = NULL;
5067
5068 /* build and send transmit frame */
5069 for (count = 0; count < TESTFRAMESIZE; ++count)
5070 buf[count] = (unsigned char)count;
5071
5072 info->tmp_rbuf_count = 0;
5073 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
5074
5075 /* program hardware for HDLC and enabled receiver */
5076 spin_lock_irqsave(&info->lock,flags);
5077 async_mode(info);
5078 rx_start(info);
5079 tx_load(info, buf, count);
5080 spin_unlock_irqrestore(&info->lock, flags);
5081
5082 /* wait for receive complete */
5083 for (timeout = 100; timeout; --timeout) {
5084 msleep_interruptible(10);
5085 if (loopback_test_rx(info)) {
5086 rc = 0;
5087 break;
5088 }
5089 }
5090
5091 /* verify received frame length and contents */
5092 if (!rc && (info->tmp_rbuf_count != count ||
5093 memcmp(buf, info->tmp_rbuf, count))) {
5094 rc = -ENODEV;
5095 }
5096
5097 spin_lock_irqsave(&info->lock,flags);
5098 reset_adapter(info);
5099 spin_unlock_irqrestore(&info->lock,flags);
5100
5101 memcpy(&info->params, ¶ms, sizeof(info->params));
5102 info->port.tty = oldtty;
5103
5104 info->init_error = rc ? DiagStatus_DmaFailure : 0;
5105 return rc;
5106}
5107
5108static int adapter_test(struct slgt_info *info)
5109{
5110 DBGINFO(("testing %s\n", info->device_name));
5111 if (register_test(info) < 0) {
5112 printk("register test failure %s addr=%08X\n",
5113 info->device_name, info->phys_reg_addr);
5114 } else if (irq_test(info) < 0) {
5115 printk("IRQ test failure %s IRQ=%d\n",
5116 info->device_name, info->irq_level);
5117 } else if (loopback_test(info) < 0) {
5118 printk("loopback test failure %s\n", info->device_name);
5119 }
5120 return info->init_error;
5121}
5122
5123/*
5124 * transmit timeout handler
5125 */
5126static void tx_timeout(unsigned long context)
5127{
5128 struct slgt_info *info = (struct slgt_info*)context;
5129 unsigned long flags;
5130
5131 DBGINFO(("%s tx_timeout\n", info->device_name));
5132 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5133 info->icount.txtimeout++;
5134 }
5135 spin_lock_irqsave(&info->lock,flags);
5136 tx_stop(info);
5137 spin_unlock_irqrestore(&info->lock,flags);
5138
5139#if SYNCLINK_GENERIC_HDLC
5140 if (info->netcount)
5141 hdlcdev_tx_done(info);
5142 else
5143#endif
5144 bh_transmit(info);
5145}
5146
5147/*
5148 * receive buffer polling timer
5149 */
5150static void rx_timeout(unsigned long context)
5151{
5152 struct slgt_info *info = (struct slgt_info*)context;
5153 unsigned long flags;
5154
5155 DBGINFO(("%s rx_timeout\n", info->device_name));
5156 spin_lock_irqsave(&info->lock, flags);
5157 info->pending_bh |= BH_RECEIVE;
5158 spin_unlock_irqrestore(&info->lock, flags);
5159 bh_handler(&info->task);
5160}
5161
1// SPDX-License-Identifier: GPL-1.0+
2/*
3 * Device driver for Microgate SyncLink GT serial adapters.
4 *
5 * written by Paul Fulghum for Microgate Corporation
6 * paulkf@microgate.com
7 *
8 * Microgate and SyncLink are trademarks of Microgate Corporation
9 *
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
11 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
12 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
13 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
14 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
15 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
16 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
17 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
18 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
19 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
20 * OF THE POSSIBILITY OF SUCH DAMAGE.
21 */
22
23/*
24 * DEBUG OUTPUT DEFINITIONS
25 *
26 * uncomment lines below to enable specific types of debug output
27 *
28 * DBGINFO information - most verbose output
29 * DBGERR serious errors
30 * DBGBH bottom half service routine debugging
31 * DBGISR interrupt service routine debugging
32 * DBGDATA output receive and transmit data
33 * DBGTBUF output transmit DMA buffers and registers
34 * DBGRBUF output receive DMA buffers and registers
35 */
36
37#define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
38#define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
39#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
40#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
41#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
42/*#define DBGTBUF(info) dump_tbufs(info)*/
43/*#define DBGRBUF(info) dump_rbufs(info)*/
44
45
46#include <linux/module.h>
47#include <linux/errno.h>
48#include <linux/signal.h>
49#include <linux/sched.h>
50#include <linux/timer.h>
51#include <linux/interrupt.h>
52#include <linux/pci.h>
53#include <linux/tty.h>
54#include <linux/tty_flip.h>
55#include <linux/serial.h>
56#include <linux/major.h>
57#include <linux/string.h>
58#include <linux/fcntl.h>
59#include <linux/ptrace.h>
60#include <linux/ioport.h>
61#include <linux/mm.h>
62#include <linux/seq_file.h>
63#include <linux/slab.h>
64#include <linux/netdevice.h>
65#include <linux/vmalloc.h>
66#include <linux/init.h>
67#include <linux/delay.h>
68#include <linux/ioctl.h>
69#include <linux/termios.h>
70#include <linux/bitops.h>
71#include <linux/workqueue.h>
72#include <linux/hdlc.h>
73#include <linux/synclink.h>
74
75#include <asm/io.h>
76#include <asm/irq.h>
77#include <asm/dma.h>
78#include <asm/types.h>
79#include <linux/uaccess.h>
80
81#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
82#define SYNCLINK_GENERIC_HDLC 1
83#else
84#define SYNCLINK_GENERIC_HDLC 0
85#endif
86
87/*
88 * module identification
89 */
90static const char driver_name[] = "SyncLink GT";
91static const char tty_dev_prefix[] = "ttySLG";
92MODULE_DESCRIPTION("Device driver for Microgate SyncLink GT serial adapters");
93MODULE_LICENSE("GPL");
94#define MAX_DEVICES 32
95
96static const struct pci_device_id pci_table[] = {
97 { PCI_VDEVICE(MICROGATE, SYNCLINK_GT_DEVICE_ID) },
98 { PCI_VDEVICE(MICROGATE, SYNCLINK_GT2_DEVICE_ID) },
99 { PCI_VDEVICE(MICROGATE, SYNCLINK_GT4_DEVICE_ID) },
100 { PCI_VDEVICE(MICROGATE, SYNCLINK_AC_DEVICE_ID) },
101 { 0 }, /* terminate list */
102};
103MODULE_DEVICE_TABLE(pci, pci_table);
104
105static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
106static void remove_one(struct pci_dev *dev);
107static struct pci_driver pci_driver = {
108 .name = "synclink_gt",
109 .id_table = pci_table,
110 .probe = init_one,
111 .remove = remove_one,
112};
113
114static bool pci_registered;
115
116/*
117 * module configuration and status
118 */
119static struct slgt_info *slgt_device_list;
120static int slgt_device_count;
121
122static int ttymajor;
123static int debug_level;
124static int maxframe[MAX_DEVICES];
125
126module_param(ttymajor, int, 0);
127module_param(debug_level, int, 0);
128module_param_array(maxframe, int, NULL, 0);
129
130MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
131MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
132MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
133
134/*
135 * tty support and callbacks
136 */
137static struct tty_driver *serial_driver;
138
139static void wait_until_sent(struct tty_struct *tty, int timeout);
140static void flush_buffer(struct tty_struct *tty);
141static void tx_release(struct tty_struct *tty);
142
143/*
144 * generic HDLC support
145 */
146#define dev_to_port(D) (dev_to_hdlc(D)->priv)
147
148
149/*
150 * device specific structures, macros and functions
151 */
152
153#define SLGT_MAX_PORTS 4
154#define SLGT_REG_SIZE 256
155
156/*
157 * conditional wait facility
158 */
159struct cond_wait {
160 struct cond_wait *next;
161 wait_queue_head_t q;
162 wait_queue_entry_t wait;
163 unsigned int data;
164};
165static void flush_cond_wait(struct cond_wait **head);
166
167/*
168 * DMA buffer descriptor and access macros
169 */
170struct slgt_desc
171{
172 __le16 count;
173 __le16 status;
174 __le32 pbuf; /* physical address of data buffer */
175 __le32 next; /* physical address of next descriptor */
176
177 /* driver book keeping */
178 char *buf; /* virtual address of data buffer */
179 unsigned int pdesc; /* physical address of this descriptor */
180 dma_addr_t buf_dma_addr;
181 unsigned short buf_count;
182};
183
184#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
185#define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
186#define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
187#define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
188#define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
189#define desc_count(a) (le16_to_cpu((a).count))
190#define desc_status(a) (le16_to_cpu((a).status))
191#define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
192#define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
193#define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
194#define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
195#define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
196
197struct _input_signal_events {
198 int ri_up;
199 int ri_down;
200 int dsr_up;
201 int dsr_down;
202 int dcd_up;
203 int dcd_down;
204 int cts_up;
205 int cts_down;
206};
207
208/*
209 * device instance data structure
210 */
211struct slgt_info {
212 void *if_ptr; /* General purpose pointer (used by SPPP) */
213 struct tty_port port;
214
215 struct slgt_info *next_device; /* device list link */
216
217 char device_name[25];
218 struct pci_dev *pdev;
219
220 int port_count; /* count of ports on adapter */
221 int adapter_num; /* adapter instance number */
222 int port_num; /* port instance number */
223
224 /* array of pointers to port contexts on this adapter */
225 struct slgt_info *port_array[SLGT_MAX_PORTS];
226
227 int line; /* tty line instance number */
228
229 struct mgsl_icount icount;
230
231 int timeout;
232 int x_char; /* xon/xoff character */
233 unsigned int read_status_mask;
234 unsigned int ignore_status_mask;
235
236 wait_queue_head_t status_event_wait_q;
237 wait_queue_head_t event_wait_q;
238 struct timer_list tx_timer;
239 struct timer_list rx_timer;
240
241 unsigned int gpio_present;
242 struct cond_wait *gpio_wait_q;
243
244 spinlock_t lock; /* spinlock for synchronizing with ISR */
245
246 struct work_struct task;
247 u32 pending_bh;
248 bool bh_requested;
249 bool bh_running;
250
251 int isr_overflow;
252 bool irq_requested; /* true if IRQ requested */
253 bool irq_occurred; /* for diagnostics use */
254
255 /* device configuration */
256
257 unsigned int bus_type;
258 unsigned int irq_level;
259 unsigned long irq_flags;
260
261 unsigned char __iomem * reg_addr; /* memory mapped registers address */
262 u32 phys_reg_addr;
263 bool reg_addr_requested;
264
265 MGSL_PARAMS params; /* communications parameters */
266 u32 idle_mode;
267 u32 max_frame_size; /* as set by device config */
268
269 unsigned int rbuf_fill_level;
270 unsigned int rx_pio;
271 unsigned int if_mode;
272 unsigned int base_clock;
273 unsigned int xsync;
274 unsigned int xctrl;
275
276 /* device status */
277
278 bool rx_enabled;
279 bool rx_restart;
280
281 bool tx_enabled;
282 bool tx_active;
283
284 unsigned char signals; /* serial signal states */
285 int init_error; /* initialization error */
286
287 unsigned char *tx_buf;
288 int tx_count;
289
290 bool drop_rts_on_tx_done;
291 struct _input_signal_events input_signal_events;
292
293 int dcd_chkcount; /* check counts to prevent */
294 int cts_chkcount; /* too many IRQs if a signal */
295 int dsr_chkcount; /* is floating */
296 int ri_chkcount;
297
298 char *bufs; /* virtual address of DMA buffer lists */
299 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
300
301 unsigned int rbuf_count;
302 struct slgt_desc *rbufs;
303 unsigned int rbuf_current;
304 unsigned int rbuf_index;
305 unsigned int rbuf_fill_index;
306 unsigned short rbuf_fill_count;
307
308 unsigned int tbuf_count;
309 struct slgt_desc *tbufs;
310 unsigned int tbuf_current;
311 unsigned int tbuf_start;
312
313 unsigned char *tmp_rbuf;
314 unsigned int tmp_rbuf_count;
315
316 /* SPPP/Cisco HDLC device parts */
317
318 int netcount;
319 spinlock_t netlock;
320#if SYNCLINK_GENERIC_HDLC
321 struct net_device *netdev;
322#endif
323
324};
325
326static const MGSL_PARAMS default_params = {
327 .mode = MGSL_MODE_HDLC,
328 .loopback = 0,
329 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
330 .encoding = HDLC_ENCODING_NRZI_SPACE,
331 .clock_speed = 0,
332 .addr_filter = 0xff,
333 .crc_type = HDLC_CRC_16_CCITT,
334 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
335 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
336 .data_rate = 9600,
337 .data_bits = 8,
338 .stop_bits = 1,
339 .parity = ASYNC_PARITY_NONE
340};
341
342
343#define BH_RECEIVE 1
344#define BH_TRANSMIT 2
345#define BH_STATUS 4
346#define IO_PIN_SHUTDOWN_LIMIT 100
347
348#define DMABUFSIZE 256
349#define DESC_LIST_SIZE 4096
350
351#define MASK_PARITY BIT1
352#define MASK_FRAMING BIT0
353#define MASK_BREAK BIT14
354#define MASK_OVERRUN BIT4
355
356#define GSR 0x00 /* global status */
357#define JCR 0x04 /* JTAG control */
358#define IODR 0x08 /* GPIO direction */
359#define IOER 0x0c /* GPIO interrupt enable */
360#define IOVR 0x10 /* GPIO value */
361#define IOSR 0x14 /* GPIO interrupt status */
362#define TDR 0x80 /* tx data */
363#define RDR 0x80 /* rx data */
364#define TCR 0x82 /* tx control */
365#define TIR 0x84 /* tx idle */
366#define TPR 0x85 /* tx preamble */
367#define RCR 0x86 /* rx control */
368#define VCR 0x88 /* V.24 control */
369#define CCR 0x89 /* clock control */
370#define BDR 0x8a /* baud divisor */
371#define SCR 0x8c /* serial control */
372#define SSR 0x8e /* serial status */
373#define RDCSR 0x90 /* rx DMA control/status */
374#define TDCSR 0x94 /* tx DMA control/status */
375#define RDDAR 0x98 /* rx DMA descriptor address */
376#define TDDAR 0x9c /* tx DMA descriptor address */
377#define XSR 0x40 /* extended sync pattern */
378#define XCR 0x44 /* extended control */
379
380#define RXIDLE BIT14
381#define RXBREAK BIT14
382#define IRQ_TXDATA BIT13
383#define IRQ_TXIDLE BIT12
384#define IRQ_TXUNDER BIT11 /* HDLC */
385#define IRQ_RXDATA BIT10
386#define IRQ_RXIDLE BIT9 /* HDLC */
387#define IRQ_RXBREAK BIT9 /* async */
388#define IRQ_RXOVER BIT8
389#define IRQ_DSR BIT7
390#define IRQ_CTS BIT6
391#define IRQ_DCD BIT5
392#define IRQ_RI BIT4
393#define IRQ_ALL 0x3ff0
394#define IRQ_MASTER BIT0
395
396#define slgt_irq_on(info, mask) \
397 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
398#define slgt_irq_off(info, mask) \
399 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
400
401static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
402static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
403static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
404static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
405static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
406static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
407
408static void msc_set_vcr(struct slgt_info *info);
409
410static int startup(struct slgt_info *info);
411static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
412static void shutdown(struct slgt_info *info);
413static void program_hw(struct slgt_info *info);
414static void change_params(struct slgt_info *info);
415
416static int adapter_test(struct slgt_info *info);
417
418static void reset_port(struct slgt_info *info);
419static void async_mode(struct slgt_info *info);
420static void sync_mode(struct slgt_info *info);
421
422static void rx_stop(struct slgt_info *info);
423static void rx_start(struct slgt_info *info);
424static void reset_rbufs(struct slgt_info *info);
425static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
426static bool rx_get_frame(struct slgt_info *info);
427static bool rx_get_buf(struct slgt_info *info);
428
429static void tx_start(struct slgt_info *info);
430static void tx_stop(struct slgt_info *info);
431static void tx_set_idle(struct slgt_info *info);
432static unsigned int tbuf_bytes(struct slgt_info *info);
433static void reset_tbufs(struct slgt_info *info);
434static void tdma_reset(struct slgt_info *info);
435static bool tx_load(struct slgt_info *info, const u8 *buf, unsigned int count);
436
437static void get_gtsignals(struct slgt_info *info);
438static void set_gtsignals(struct slgt_info *info);
439static void set_rate(struct slgt_info *info, u32 data_rate);
440
441static void bh_transmit(struct slgt_info *info);
442static void isr_txeom(struct slgt_info *info, unsigned short status);
443
444static void tx_timeout(struct timer_list *t);
445static void rx_timeout(struct timer_list *t);
446
447/*
448 * ioctl handlers
449 */
450static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
451static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
452static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
453static int get_txidle(struct slgt_info *info, int __user *idle_mode);
454static int set_txidle(struct slgt_info *info, int idle_mode);
455static int tx_enable(struct slgt_info *info, int enable);
456static int tx_abort(struct slgt_info *info);
457static int rx_enable(struct slgt_info *info, int enable);
458static int modem_input_wait(struct slgt_info *info,int arg);
459static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
460static int get_interface(struct slgt_info *info, int __user *if_mode);
461static int set_interface(struct slgt_info *info, int if_mode);
462static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
463static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
464static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
465static int get_xsync(struct slgt_info *info, int __user *if_mode);
466static int set_xsync(struct slgt_info *info, int if_mode);
467static int get_xctrl(struct slgt_info *info, int __user *if_mode);
468static int set_xctrl(struct slgt_info *info, int if_mode);
469
470/*
471 * driver functions
472 */
473static void release_resources(struct slgt_info *info);
474
475/*
476 * DEBUG OUTPUT CODE
477 */
478#ifndef DBGINFO
479#define DBGINFO(fmt)
480#endif
481#ifndef DBGERR
482#define DBGERR(fmt)
483#endif
484#ifndef DBGBH
485#define DBGBH(fmt)
486#endif
487#ifndef DBGISR
488#define DBGISR(fmt)
489#endif
490
491#ifdef DBGDATA
492static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
493{
494 int i;
495 int linecount;
496 printk("%s %s data:\n",info->device_name, label);
497 while(count) {
498 linecount = (count > 16) ? 16 : count;
499 for(i=0; i < linecount; i++)
500 printk("%02X ",(unsigned char)data[i]);
501 for(;i<17;i++)
502 printk(" ");
503 for(i=0;i<linecount;i++) {
504 if (data[i]>=040 && data[i]<=0176)
505 printk("%c",data[i]);
506 else
507 printk(".");
508 }
509 printk("\n");
510 data += linecount;
511 count -= linecount;
512 }
513}
514#else
515#define DBGDATA(info, buf, size, label)
516#endif
517
518#ifdef DBGTBUF
519static void dump_tbufs(struct slgt_info *info)
520{
521 int i;
522 printk("tbuf_current=%d\n", info->tbuf_current);
523 for (i=0 ; i < info->tbuf_count ; i++) {
524 printk("%d: count=%04X status=%04X\n",
525 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
526 }
527}
528#else
529#define DBGTBUF(info)
530#endif
531
532#ifdef DBGRBUF
533static void dump_rbufs(struct slgt_info *info)
534{
535 int i;
536 printk("rbuf_current=%d\n", info->rbuf_current);
537 for (i=0 ; i < info->rbuf_count ; i++) {
538 printk("%d: count=%04X status=%04X\n",
539 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
540 }
541}
542#else
543#define DBGRBUF(info)
544#endif
545
546static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
547{
548#ifdef SANITY_CHECK
549 if (!info) {
550 printk("null struct slgt_info for (%s) in %s\n", devname, name);
551 return 1;
552 }
553#else
554 if (!info)
555 return 1;
556#endif
557 return 0;
558}
559
560/*
561 * line discipline callback wrappers
562 *
563 * The wrappers maintain line discipline references
564 * while calling into the line discipline.
565 *
566 * ldisc_receive_buf - pass receive data to line discipline
567 */
568static void ldisc_receive_buf(struct tty_struct *tty,
569 const __u8 *data, char *flags, int count)
570{
571 struct tty_ldisc *ld;
572 if (!tty)
573 return;
574 ld = tty_ldisc_ref(tty);
575 if (ld) {
576 if (ld->ops->receive_buf)
577 ld->ops->receive_buf(tty, data, flags, count);
578 tty_ldisc_deref(ld);
579 }
580}
581
582/* tty callbacks */
583
584static int open(struct tty_struct *tty, struct file *filp)
585{
586 struct slgt_info *info;
587 int retval, line;
588 unsigned long flags;
589
590 line = tty->index;
591 if (line >= slgt_device_count) {
592 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
593 return -ENODEV;
594 }
595
596 info = slgt_device_list;
597 while(info && info->line != line)
598 info = info->next_device;
599 if (sanity_check(info, tty->name, "open"))
600 return -ENODEV;
601 if (info->init_error) {
602 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
603 return -ENODEV;
604 }
605
606 tty->driver_data = info;
607 info->port.tty = tty;
608
609 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
610
611 mutex_lock(&info->port.mutex);
612
613 spin_lock_irqsave(&info->netlock, flags);
614 if (info->netcount) {
615 retval = -EBUSY;
616 spin_unlock_irqrestore(&info->netlock, flags);
617 mutex_unlock(&info->port.mutex);
618 goto cleanup;
619 }
620 info->port.count++;
621 spin_unlock_irqrestore(&info->netlock, flags);
622
623 if (info->port.count == 1) {
624 /* 1st open on this device, init hardware */
625 retval = startup(info);
626 if (retval < 0) {
627 mutex_unlock(&info->port.mutex);
628 goto cleanup;
629 }
630 }
631 mutex_unlock(&info->port.mutex);
632 retval = block_til_ready(tty, filp, info);
633 if (retval) {
634 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
635 goto cleanup;
636 }
637
638 retval = 0;
639
640cleanup:
641 if (retval) {
642 if (tty->count == 1)
643 info->port.tty = NULL; /* tty layer will release tty struct */
644 if(info->port.count)
645 info->port.count--;
646 }
647
648 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
649 return retval;
650}
651
652static void close(struct tty_struct *tty, struct file *filp)
653{
654 struct slgt_info *info = tty->driver_data;
655
656 if (sanity_check(info, tty->name, "close"))
657 return;
658 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
659
660 if (tty_port_close_start(&info->port, tty, filp) == 0)
661 goto cleanup;
662
663 mutex_lock(&info->port.mutex);
664 if (tty_port_initialized(&info->port))
665 wait_until_sent(tty, info->timeout);
666 flush_buffer(tty);
667 tty_ldisc_flush(tty);
668
669 shutdown(info);
670 mutex_unlock(&info->port.mutex);
671
672 tty_port_close_end(&info->port, tty);
673 info->port.tty = NULL;
674cleanup:
675 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
676}
677
678static void hangup(struct tty_struct *tty)
679{
680 struct slgt_info *info = tty->driver_data;
681 unsigned long flags;
682
683 if (sanity_check(info, tty->name, "hangup"))
684 return;
685 DBGINFO(("%s hangup\n", info->device_name));
686
687 flush_buffer(tty);
688
689 mutex_lock(&info->port.mutex);
690 shutdown(info);
691
692 spin_lock_irqsave(&info->port.lock, flags);
693 info->port.count = 0;
694 info->port.tty = NULL;
695 spin_unlock_irqrestore(&info->port.lock, flags);
696 tty_port_set_active(&info->port, false);
697 mutex_unlock(&info->port.mutex);
698
699 wake_up_interruptible(&info->port.open_wait);
700}
701
702static void set_termios(struct tty_struct *tty,
703 const struct ktermios *old_termios)
704{
705 struct slgt_info *info = tty->driver_data;
706 unsigned long flags;
707
708 DBGINFO(("%s set_termios\n", tty->driver->name));
709
710 change_params(info);
711
712 /* Handle transition to B0 status */
713 if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
714 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
715 spin_lock_irqsave(&info->lock,flags);
716 set_gtsignals(info);
717 spin_unlock_irqrestore(&info->lock,flags);
718 }
719
720 /* Handle transition away from B0 status */
721 if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
722 info->signals |= SerialSignal_DTR;
723 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
724 info->signals |= SerialSignal_RTS;
725 spin_lock_irqsave(&info->lock,flags);
726 set_gtsignals(info);
727 spin_unlock_irqrestore(&info->lock,flags);
728 }
729
730 /* Handle turning off CRTSCTS */
731 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
732 tty->hw_stopped = false;
733 tx_release(tty);
734 }
735}
736
737static void update_tx_timer(struct slgt_info *info)
738{
739 /*
740 * use worst case speed of 1200bps to calculate transmit timeout
741 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
742 */
743 if (info->params.mode == MGSL_MODE_HDLC) {
744 int timeout = (tbuf_bytes(info) * 7) + 1000;
745 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
746 }
747}
748
749static ssize_t write(struct tty_struct *tty, const u8 *buf, size_t count)
750{
751 int ret = 0;
752 struct slgt_info *info = tty->driver_data;
753 unsigned long flags;
754
755 if (sanity_check(info, tty->name, "write"))
756 return -EIO;
757
758 DBGINFO(("%s write count=%zu\n", info->device_name, count));
759
760 if (!info->tx_buf || (count > info->max_frame_size))
761 return -EIO;
762
763 if (!count || tty->flow.stopped || tty->hw_stopped)
764 return 0;
765
766 spin_lock_irqsave(&info->lock, flags);
767
768 if (info->tx_count) {
769 /* send accumulated data from send_char() */
770 if (!tx_load(info, info->tx_buf, info->tx_count))
771 goto cleanup;
772 info->tx_count = 0;
773 }
774
775 if (tx_load(info, buf, count))
776 ret = count;
777
778cleanup:
779 spin_unlock_irqrestore(&info->lock, flags);
780 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
781 return ret;
782}
783
784static int put_char(struct tty_struct *tty, u8 ch)
785{
786 struct slgt_info *info = tty->driver_data;
787 unsigned long flags;
788 int ret = 0;
789
790 if (sanity_check(info, tty->name, "put_char"))
791 return 0;
792 DBGINFO(("%s put_char(%u)\n", info->device_name, ch));
793 if (!info->tx_buf)
794 return 0;
795 spin_lock_irqsave(&info->lock,flags);
796 if (info->tx_count < info->max_frame_size) {
797 info->tx_buf[info->tx_count++] = ch;
798 ret = 1;
799 }
800 spin_unlock_irqrestore(&info->lock,flags);
801 return ret;
802}
803
804static void send_xchar(struct tty_struct *tty, char ch)
805{
806 struct slgt_info *info = tty->driver_data;
807 unsigned long flags;
808
809 if (sanity_check(info, tty->name, "send_xchar"))
810 return;
811 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
812 info->x_char = ch;
813 if (ch) {
814 spin_lock_irqsave(&info->lock,flags);
815 if (!info->tx_enabled)
816 tx_start(info);
817 spin_unlock_irqrestore(&info->lock,flags);
818 }
819}
820
821static void wait_until_sent(struct tty_struct *tty, int timeout)
822{
823 struct slgt_info *info = tty->driver_data;
824 unsigned long orig_jiffies, char_time;
825
826 if (!info )
827 return;
828 if (sanity_check(info, tty->name, "wait_until_sent"))
829 return;
830 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
831 if (!tty_port_initialized(&info->port))
832 goto exit;
833
834 orig_jiffies = jiffies;
835
836 /* Set check interval to 1/5 of estimated time to
837 * send a character, and make it at least 1. The check
838 * interval should also be less than the timeout.
839 * Note: use tight timings here to satisfy the NIST-PCTS.
840 */
841
842 if (info->params.data_rate) {
843 char_time = info->timeout/(32 * 5);
844 if (!char_time)
845 char_time++;
846 } else
847 char_time = 1;
848
849 if (timeout)
850 char_time = min_t(unsigned long, char_time, timeout);
851
852 while (info->tx_active) {
853 msleep_interruptible(jiffies_to_msecs(char_time));
854 if (signal_pending(current))
855 break;
856 if (timeout && time_after(jiffies, orig_jiffies + timeout))
857 break;
858 }
859exit:
860 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
861}
862
863static unsigned int write_room(struct tty_struct *tty)
864{
865 struct slgt_info *info = tty->driver_data;
866 unsigned int ret;
867
868 if (sanity_check(info, tty->name, "write_room"))
869 return 0;
870 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
871 DBGINFO(("%s write_room=%u\n", info->device_name, ret));
872 return ret;
873}
874
875static void flush_chars(struct tty_struct *tty)
876{
877 struct slgt_info *info = tty->driver_data;
878 unsigned long flags;
879
880 if (sanity_check(info, tty->name, "flush_chars"))
881 return;
882 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
883
884 if (info->tx_count <= 0 || tty->flow.stopped ||
885 tty->hw_stopped || !info->tx_buf)
886 return;
887
888 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
889
890 spin_lock_irqsave(&info->lock,flags);
891 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
892 info->tx_count = 0;
893 spin_unlock_irqrestore(&info->lock,flags);
894}
895
896static void flush_buffer(struct tty_struct *tty)
897{
898 struct slgt_info *info = tty->driver_data;
899 unsigned long flags;
900
901 if (sanity_check(info, tty->name, "flush_buffer"))
902 return;
903 DBGINFO(("%s flush_buffer\n", info->device_name));
904
905 spin_lock_irqsave(&info->lock, flags);
906 info->tx_count = 0;
907 spin_unlock_irqrestore(&info->lock, flags);
908
909 tty_wakeup(tty);
910}
911
912/*
913 * throttle (stop) transmitter
914 */
915static void tx_hold(struct tty_struct *tty)
916{
917 struct slgt_info *info = tty->driver_data;
918 unsigned long flags;
919
920 if (sanity_check(info, tty->name, "tx_hold"))
921 return;
922 DBGINFO(("%s tx_hold\n", info->device_name));
923 spin_lock_irqsave(&info->lock,flags);
924 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
925 tx_stop(info);
926 spin_unlock_irqrestore(&info->lock,flags);
927}
928
929/*
930 * release (start) transmitter
931 */
932static void tx_release(struct tty_struct *tty)
933{
934 struct slgt_info *info = tty->driver_data;
935 unsigned long flags;
936
937 if (sanity_check(info, tty->name, "tx_release"))
938 return;
939 DBGINFO(("%s tx_release\n", info->device_name));
940 spin_lock_irqsave(&info->lock, flags);
941 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
942 info->tx_count = 0;
943 spin_unlock_irqrestore(&info->lock, flags);
944}
945
946/*
947 * Service an IOCTL request
948 *
949 * Arguments
950 *
951 * tty pointer to tty instance data
952 * cmd IOCTL command code
953 * arg command argument/context
954 *
955 * Return 0 if success, otherwise error code
956 */
957static int ioctl(struct tty_struct *tty,
958 unsigned int cmd, unsigned long arg)
959{
960 struct slgt_info *info = tty->driver_data;
961 void __user *argp = (void __user *)arg;
962 int ret;
963
964 if (sanity_check(info, tty->name, "ioctl"))
965 return -ENODEV;
966 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
967
968 if (cmd != TIOCMIWAIT) {
969 if (tty_io_error(tty))
970 return -EIO;
971 }
972
973 switch (cmd) {
974 case MGSL_IOCWAITEVENT:
975 return wait_mgsl_event(info, argp);
976 case TIOCMIWAIT:
977 return modem_input_wait(info,(int)arg);
978 case MGSL_IOCSGPIO:
979 return set_gpio(info, argp);
980 case MGSL_IOCGGPIO:
981 return get_gpio(info, argp);
982 case MGSL_IOCWAITGPIO:
983 return wait_gpio(info, argp);
984 case MGSL_IOCGXSYNC:
985 return get_xsync(info, argp);
986 case MGSL_IOCSXSYNC:
987 return set_xsync(info, (int)arg);
988 case MGSL_IOCGXCTRL:
989 return get_xctrl(info, argp);
990 case MGSL_IOCSXCTRL:
991 return set_xctrl(info, (int)arg);
992 }
993 mutex_lock(&info->port.mutex);
994 switch (cmd) {
995 case MGSL_IOCGPARAMS:
996 ret = get_params(info, argp);
997 break;
998 case MGSL_IOCSPARAMS:
999 ret = set_params(info, argp);
1000 break;
1001 case MGSL_IOCGTXIDLE:
1002 ret = get_txidle(info, argp);
1003 break;
1004 case MGSL_IOCSTXIDLE:
1005 ret = set_txidle(info, (int)arg);
1006 break;
1007 case MGSL_IOCTXENABLE:
1008 ret = tx_enable(info, (int)arg);
1009 break;
1010 case MGSL_IOCRXENABLE:
1011 ret = rx_enable(info, (int)arg);
1012 break;
1013 case MGSL_IOCTXABORT:
1014 ret = tx_abort(info);
1015 break;
1016 case MGSL_IOCGSTATS:
1017 ret = get_stats(info, argp);
1018 break;
1019 case MGSL_IOCGIF:
1020 ret = get_interface(info, argp);
1021 break;
1022 case MGSL_IOCSIF:
1023 ret = set_interface(info,(int)arg);
1024 break;
1025 default:
1026 ret = -ENOIOCTLCMD;
1027 }
1028 mutex_unlock(&info->port.mutex);
1029 return ret;
1030}
1031
1032static int get_icount(struct tty_struct *tty,
1033 struct serial_icounter_struct *icount)
1034
1035{
1036 struct slgt_info *info = tty->driver_data;
1037 struct mgsl_icount cnow; /* kernel counter temps */
1038 unsigned long flags;
1039
1040 spin_lock_irqsave(&info->lock,flags);
1041 cnow = info->icount;
1042 spin_unlock_irqrestore(&info->lock,flags);
1043
1044 icount->cts = cnow.cts;
1045 icount->dsr = cnow.dsr;
1046 icount->rng = cnow.rng;
1047 icount->dcd = cnow.dcd;
1048 icount->rx = cnow.rx;
1049 icount->tx = cnow.tx;
1050 icount->frame = cnow.frame;
1051 icount->overrun = cnow.overrun;
1052 icount->parity = cnow.parity;
1053 icount->brk = cnow.brk;
1054 icount->buf_overrun = cnow.buf_overrun;
1055
1056 return 0;
1057}
1058
1059/*
1060 * support for 32 bit ioctl calls on 64 bit systems
1061 */
1062#ifdef CONFIG_COMPAT
1063static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1064{
1065 struct MGSL_PARAMS32 tmp_params;
1066
1067 DBGINFO(("%s get_params32\n", info->device_name));
1068 memset(&tmp_params, 0, sizeof(tmp_params));
1069 tmp_params.mode = (compat_ulong_t)info->params.mode;
1070 tmp_params.loopback = info->params.loopback;
1071 tmp_params.flags = info->params.flags;
1072 tmp_params.encoding = info->params.encoding;
1073 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1074 tmp_params.addr_filter = info->params.addr_filter;
1075 tmp_params.crc_type = info->params.crc_type;
1076 tmp_params.preamble_length = info->params.preamble_length;
1077 tmp_params.preamble = info->params.preamble;
1078 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1079 tmp_params.data_bits = info->params.data_bits;
1080 tmp_params.stop_bits = info->params.stop_bits;
1081 tmp_params.parity = info->params.parity;
1082 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1083 return -EFAULT;
1084 return 0;
1085}
1086
1087static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1088{
1089 struct MGSL_PARAMS32 tmp_params;
1090 unsigned long flags;
1091
1092 DBGINFO(("%s set_params32\n", info->device_name));
1093 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1094 return -EFAULT;
1095
1096 spin_lock_irqsave(&info->lock, flags);
1097 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1098 info->base_clock = tmp_params.clock_speed;
1099 } else {
1100 info->params.mode = tmp_params.mode;
1101 info->params.loopback = tmp_params.loopback;
1102 info->params.flags = tmp_params.flags;
1103 info->params.encoding = tmp_params.encoding;
1104 info->params.clock_speed = tmp_params.clock_speed;
1105 info->params.addr_filter = tmp_params.addr_filter;
1106 info->params.crc_type = tmp_params.crc_type;
1107 info->params.preamble_length = tmp_params.preamble_length;
1108 info->params.preamble = tmp_params.preamble;
1109 info->params.data_rate = tmp_params.data_rate;
1110 info->params.data_bits = tmp_params.data_bits;
1111 info->params.stop_bits = tmp_params.stop_bits;
1112 info->params.parity = tmp_params.parity;
1113 }
1114 spin_unlock_irqrestore(&info->lock, flags);
1115
1116 program_hw(info);
1117
1118 return 0;
1119}
1120
1121static long slgt_compat_ioctl(struct tty_struct *tty,
1122 unsigned int cmd, unsigned long arg)
1123{
1124 struct slgt_info *info = tty->driver_data;
1125 int rc;
1126
1127 if (sanity_check(info, tty->name, "compat_ioctl"))
1128 return -ENODEV;
1129 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1130
1131 switch (cmd) {
1132 case MGSL_IOCSPARAMS32:
1133 rc = set_params32(info, compat_ptr(arg));
1134 break;
1135
1136 case MGSL_IOCGPARAMS32:
1137 rc = get_params32(info, compat_ptr(arg));
1138 break;
1139
1140 case MGSL_IOCGPARAMS:
1141 case MGSL_IOCSPARAMS:
1142 case MGSL_IOCGTXIDLE:
1143 case MGSL_IOCGSTATS:
1144 case MGSL_IOCWAITEVENT:
1145 case MGSL_IOCGIF:
1146 case MGSL_IOCSGPIO:
1147 case MGSL_IOCGGPIO:
1148 case MGSL_IOCWAITGPIO:
1149 case MGSL_IOCGXSYNC:
1150 case MGSL_IOCGXCTRL:
1151 rc = ioctl(tty, cmd, (unsigned long)compat_ptr(arg));
1152 break;
1153 default:
1154 rc = ioctl(tty, cmd, arg);
1155 }
1156 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1157 return rc;
1158}
1159#else
1160#define slgt_compat_ioctl NULL
1161#endif /* ifdef CONFIG_COMPAT */
1162
1163/*
1164 * proc fs support
1165 */
1166static inline void line_info(struct seq_file *m, struct slgt_info *info)
1167{
1168 char stat_buf[30];
1169 unsigned long flags;
1170
1171 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1172 info->device_name, info->phys_reg_addr,
1173 info->irq_level, info->max_frame_size);
1174
1175 /* output current serial signal states */
1176 spin_lock_irqsave(&info->lock,flags);
1177 get_gtsignals(info);
1178 spin_unlock_irqrestore(&info->lock,flags);
1179
1180 stat_buf[0] = 0;
1181 stat_buf[1] = 0;
1182 if (info->signals & SerialSignal_RTS)
1183 strcat(stat_buf, "|RTS");
1184 if (info->signals & SerialSignal_CTS)
1185 strcat(stat_buf, "|CTS");
1186 if (info->signals & SerialSignal_DTR)
1187 strcat(stat_buf, "|DTR");
1188 if (info->signals & SerialSignal_DSR)
1189 strcat(stat_buf, "|DSR");
1190 if (info->signals & SerialSignal_DCD)
1191 strcat(stat_buf, "|CD");
1192 if (info->signals & SerialSignal_RI)
1193 strcat(stat_buf, "|RI");
1194
1195 if (info->params.mode != MGSL_MODE_ASYNC) {
1196 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1197 info->icount.txok, info->icount.rxok);
1198 if (info->icount.txunder)
1199 seq_printf(m, " txunder:%d", info->icount.txunder);
1200 if (info->icount.txabort)
1201 seq_printf(m, " txabort:%d", info->icount.txabort);
1202 if (info->icount.rxshort)
1203 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1204 if (info->icount.rxlong)
1205 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1206 if (info->icount.rxover)
1207 seq_printf(m, " rxover:%d", info->icount.rxover);
1208 if (info->icount.rxcrc)
1209 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1210 } else {
1211 seq_printf(m, "\tASYNC tx:%d rx:%d",
1212 info->icount.tx, info->icount.rx);
1213 if (info->icount.frame)
1214 seq_printf(m, " fe:%d", info->icount.frame);
1215 if (info->icount.parity)
1216 seq_printf(m, " pe:%d", info->icount.parity);
1217 if (info->icount.brk)
1218 seq_printf(m, " brk:%d", info->icount.brk);
1219 if (info->icount.overrun)
1220 seq_printf(m, " oe:%d", info->icount.overrun);
1221 }
1222
1223 /* Append serial signal status to end */
1224 seq_printf(m, " %s\n", stat_buf+1);
1225
1226 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1227 info->tx_active,info->bh_requested,info->bh_running,
1228 info->pending_bh);
1229}
1230
1231/* Called to print information about devices
1232 */
1233static int synclink_gt_proc_show(struct seq_file *m, void *v)
1234{
1235 struct slgt_info *info;
1236
1237 seq_puts(m, "synclink_gt driver\n");
1238
1239 info = slgt_device_list;
1240 while( info ) {
1241 line_info(m, info);
1242 info = info->next_device;
1243 }
1244 return 0;
1245}
1246
1247/*
1248 * return count of bytes in transmit buffer
1249 */
1250static unsigned int chars_in_buffer(struct tty_struct *tty)
1251{
1252 struct slgt_info *info = tty->driver_data;
1253 unsigned int count;
1254 if (sanity_check(info, tty->name, "chars_in_buffer"))
1255 return 0;
1256 count = tbuf_bytes(info);
1257 DBGINFO(("%s chars_in_buffer()=%u\n", info->device_name, count));
1258 return count;
1259}
1260
1261/*
1262 * signal remote device to throttle send data (our receive data)
1263 */
1264static void throttle(struct tty_struct * tty)
1265{
1266 struct slgt_info *info = tty->driver_data;
1267 unsigned long flags;
1268
1269 if (sanity_check(info, tty->name, "throttle"))
1270 return;
1271 DBGINFO(("%s throttle\n", info->device_name));
1272 if (I_IXOFF(tty))
1273 send_xchar(tty, STOP_CHAR(tty));
1274 if (C_CRTSCTS(tty)) {
1275 spin_lock_irqsave(&info->lock,flags);
1276 info->signals &= ~SerialSignal_RTS;
1277 set_gtsignals(info);
1278 spin_unlock_irqrestore(&info->lock,flags);
1279 }
1280}
1281
1282/*
1283 * signal remote device to stop throttling send data (our receive data)
1284 */
1285static void unthrottle(struct tty_struct * tty)
1286{
1287 struct slgt_info *info = tty->driver_data;
1288 unsigned long flags;
1289
1290 if (sanity_check(info, tty->name, "unthrottle"))
1291 return;
1292 DBGINFO(("%s unthrottle\n", info->device_name));
1293 if (I_IXOFF(tty)) {
1294 if (info->x_char)
1295 info->x_char = 0;
1296 else
1297 send_xchar(tty, START_CHAR(tty));
1298 }
1299 if (C_CRTSCTS(tty)) {
1300 spin_lock_irqsave(&info->lock,flags);
1301 info->signals |= SerialSignal_RTS;
1302 set_gtsignals(info);
1303 spin_unlock_irqrestore(&info->lock,flags);
1304 }
1305}
1306
1307/*
1308 * set or clear transmit break condition
1309 * break_state -1=set break condition, 0=clear
1310 */
1311static int set_break(struct tty_struct *tty, int break_state)
1312{
1313 struct slgt_info *info = tty->driver_data;
1314 unsigned short value;
1315 unsigned long flags;
1316
1317 if (sanity_check(info, tty->name, "set_break"))
1318 return -EINVAL;
1319 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1320
1321 spin_lock_irqsave(&info->lock,flags);
1322 value = rd_reg16(info, TCR);
1323 if (break_state == -1)
1324 value |= BIT6;
1325 else
1326 value &= ~BIT6;
1327 wr_reg16(info, TCR, value);
1328 spin_unlock_irqrestore(&info->lock,flags);
1329 return 0;
1330}
1331
1332#if SYNCLINK_GENERIC_HDLC
1333
1334/**
1335 * hdlcdev_attach - called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1336 * @dev: pointer to network device structure
1337 * @encoding: serial encoding setting
1338 * @parity: FCS setting
1339 *
1340 * Set encoding and frame check sequence (FCS) options.
1341 *
1342 * Return: 0 if success, otherwise error code
1343 */
1344static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1345 unsigned short parity)
1346{
1347 struct slgt_info *info = dev_to_port(dev);
1348 unsigned char new_encoding;
1349 unsigned short new_crctype;
1350
1351 /* return error if TTY interface open */
1352 if (info->port.count)
1353 return -EBUSY;
1354
1355 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1356
1357 switch (encoding)
1358 {
1359 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1360 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1361 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1362 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1363 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1364 default: return -EINVAL;
1365 }
1366
1367 switch (parity)
1368 {
1369 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1370 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1371 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1372 default: return -EINVAL;
1373 }
1374
1375 info->params.encoding = new_encoding;
1376 info->params.crc_type = new_crctype;
1377
1378 /* if network interface up, reprogram hardware */
1379 if (info->netcount)
1380 program_hw(info);
1381
1382 return 0;
1383}
1384
1385/**
1386 * hdlcdev_xmit - called by generic HDLC layer to send a frame
1387 * @skb: socket buffer containing HDLC frame
1388 * @dev: pointer to network device structure
1389 */
1390static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1391 struct net_device *dev)
1392{
1393 struct slgt_info *info = dev_to_port(dev);
1394 unsigned long flags;
1395
1396 DBGINFO(("%s hdlc_xmit\n", dev->name));
1397
1398 if (!skb->len)
1399 return NETDEV_TX_OK;
1400
1401 /* stop sending until this frame completes */
1402 netif_stop_queue(dev);
1403
1404 /* update network statistics */
1405 dev->stats.tx_packets++;
1406 dev->stats.tx_bytes += skb->len;
1407
1408 /* save start time for transmit timeout detection */
1409 netif_trans_update(dev);
1410
1411 spin_lock_irqsave(&info->lock, flags);
1412 tx_load(info, skb->data, skb->len);
1413 spin_unlock_irqrestore(&info->lock, flags);
1414
1415 /* done with socket buffer, so free it */
1416 dev_kfree_skb(skb);
1417
1418 return NETDEV_TX_OK;
1419}
1420
1421/**
1422 * hdlcdev_open - called by network layer when interface enabled
1423 * @dev: pointer to network device structure
1424 *
1425 * Claim resources and initialize hardware.
1426 *
1427 * Return: 0 if success, otherwise error code
1428 */
1429static int hdlcdev_open(struct net_device *dev)
1430{
1431 struct slgt_info *info = dev_to_port(dev);
1432 int rc;
1433 unsigned long flags;
1434
1435 DBGINFO(("%s hdlcdev_open\n", dev->name));
1436
1437 /* arbitrate between network and tty opens */
1438 spin_lock_irqsave(&info->netlock, flags);
1439 if (info->port.count != 0 || info->netcount != 0) {
1440 DBGINFO(("%s hdlc_open busy\n", dev->name));
1441 spin_unlock_irqrestore(&info->netlock, flags);
1442 return -EBUSY;
1443 }
1444 info->netcount=1;
1445 spin_unlock_irqrestore(&info->netlock, flags);
1446
1447 /* claim resources and init adapter */
1448 if ((rc = startup(info)) != 0) {
1449 spin_lock_irqsave(&info->netlock, flags);
1450 info->netcount=0;
1451 spin_unlock_irqrestore(&info->netlock, flags);
1452 return rc;
1453 }
1454
1455 /* generic HDLC layer open processing */
1456 rc = hdlc_open(dev);
1457 if (rc) {
1458 shutdown(info);
1459 spin_lock_irqsave(&info->netlock, flags);
1460 info->netcount = 0;
1461 spin_unlock_irqrestore(&info->netlock, flags);
1462 return rc;
1463 }
1464
1465 /* assert RTS and DTR, apply hardware settings */
1466 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
1467 program_hw(info);
1468
1469 /* enable network layer transmit */
1470 netif_trans_update(dev);
1471 netif_start_queue(dev);
1472
1473 /* inform generic HDLC layer of current DCD status */
1474 spin_lock_irqsave(&info->lock, flags);
1475 get_gtsignals(info);
1476 spin_unlock_irqrestore(&info->lock, flags);
1477 if (info->signals & SerialSignal_DCD)
1478 netif_carrier_on(dev);
1479 else
1480 netif_carrier_off(dev);
1481 return 0;
1482}
1483
1484/**
1485 * hdlcdev_close - called by network layer when interface is disabled
1486 * @dev: pointer to network device structure
1487 *
1488 * Shutdown hardware and release resources.
1489 *
1490 * Return: 0 if success, otherwise error code
1491 */
1492static int hdlcdev_close(struct net_device *dev)
1493{
1494 struct slgt_info *info = dev_to_port(dev);
1495 unsigned long flags;
1496
1497 DBGINFO(("%s hdlcdev_close\n", dev->name));
1498
1499 netif_stop_queue(dev);
1500
1501 /* shutdown adapter and release resources */
1502 shutdown(info);
1503
1504 hdlc_close(dev);
1505
1506 spin_lock_irqsave(&info->netlock, flags);
1507 info->netcount=0;
1508 spin_unlock_irqrestore(&info->netlock, flags);
1509
1510 return 0;
1511}
1512
1513/**
1514 * hdlcdev_ioctl - called by network layer to process IOCTL call to network device
1515 * @dev: pointer to network device structure
1516 * @ifr: pointer to network interface request structure
1517 * @cmd: IOCTL command code
1518 *
1519 * Return: 0 if success, otherwise error code
1520 */
1521static int hdlcdev_ioctl(struct net_device *dev, struct if_settings *ifs)
1522{
1523 const size_t size = sizeof(sync_serial_settings);
1524 sync_serial_settings new_line;
1525 sync_serial_settings __user *line = ifs->ifs_ifsu.sync;
1526 struct slgt_info *info = dev_to_port(dev);
1527 unsigned int flags;
1528
1529 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1530
1531 /* return error if TTY interface open */
1532 if (info->port.count)
1533 return -EBUSY;
1534
1535 memset(&new_line, 0, sizeof(new_line));
1536
1537 switch (ifs->type) {
1538 case IF_GET_IFACE: /* return current sync_serial_settings */
1539
1540 ifs->type = IF_IFACE_SYNC_SERIAL;
1541 if (ifs->size < size) {
1542 ifs->size = size; /* data size wanted */
1543 return -ENOBUFS;
1544 }
1545
1546 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1547 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1548 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1549 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1550
1551 switch (flags){
1552 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1553 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1554 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1555 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1556 default: new_line.clock_type = CLOCK_DEFAULT;
1557 }
1558
1559 new_line.clock_rate = info->params.clock_speed;
1560 new_line.loopback = info->params.loopback ? 1:0;
1561
1562 if (copy_to_user(line, &new_line, size))
1563 return -EFAULT;
1564 return 0;
1565
1566 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1567
1568 if(!capable(CAP_NET_ADMIN))
1569 return -EPERM;
1570 if (copy_from_user(&new_line, line, size))
1571 return -EFAULT;
1572
1573 switch (new_line.clock_type)
1574 {
1575 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1576 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1577 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1578 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1579 case CLOCK_DEFAULT: flags = info->params.flags &
1580 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1581 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1582 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1583 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1584 default: return -EINVAL;
1585 }
1586
1587 if (new_line.loopback != 0 && new_line.loopback != 1)
1588 return -EINVAL;
1589
1590 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1591 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1592 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1593 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1594 info->params.flags |= flags;
1595
1596 info->params.loopback = new_line.loopback;
1597
1598 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1599 info->params.clock_speed = new_line.clock_rate;
1600 else
1601 info->params.clock_speed = 0;
1602
1603 /* if network interface up, reprogram hardware */
1604 if (info->netcount)
1605 program_hw(info);
1606 return 0;
1607
1608 default:
1609 return hdlc_ioctl(dev, ifs);
1610 }
1611}
1612
1613/**
1614 * hdlcdev_tx_timeout - called by network layer when transmit timeout is detected
1615 * @dev: pointer to network device structure
1616 * @txqueue: unused
1617 */
1618static void hdlcdev_tx_timeout(struct net_device *dev, unsigned int txqueue)
1619{
1620 struct slgt_info *info = dev_to_port(dev);
1621 unsigned long flags;
1622
1623 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1624
1625 dev->stats.tx_errors++;
1626 dev->stats.tx_aborted_errors++;
1627
1628 spin_lock_irqsave(&info->lock,flags);
1629 tx_stop(info);
1630 spin_unlock_irqrestore(&info->lock,flags);
1631
1632 netif_wake_queue(dev);
1633}
1634
1635/**
1636 * hdlcdev_tx_done - called by device driver when transmit completes
1637 * @info: pointer to device instance information
1638 *
1639 * Reenable network layer transmit if stopped.
1640 */
1641static void hdlcdev_tx_done(struct slgt_info *info)
1642{
1643 if (netif_queue_stopped(info->netdev))
1644 netif_wake_queue(info->netdev);
1645}
1646
1647/**
1648 * hdlcdev_rx - called by device driver when frame received
1649 * @info: pointer to device instance information
1650 * @buf: pointer to buffer contianing frame data
1651 * @size: count of data bytes in buf
1652 *
1653 * Pass frame to network layer.
1654 */
1655static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1656{
1657 struct sk_buff *skb = dev_alloc_skb(size);
1658 struct net_device *dev = info->netdev;
1659
1660 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1661
1662 if (skb == NULL) {
1663 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1664 dev->stats.rx_dropped++;
1665 return;
1666 }
1667
1668 skb_put_data(skb, buf, size);
1669
1670 skb->protocol = hdlc_type_trans(skb, dev);
1671
1672 dev->stats.rx_packets++;
1673 dev->stats.rx_bytes += size;
1674
1675 netif_rx(skb);
1676}
1677
1678static const struct net_device_ops hdlcdev_ops = {
1679 .ndo_open = hdlcdev_open,
1680 .ndo_stop = hdlcdev_close,
1681 .ndo_start_xmit = hdlc_start_xmit,
1682 .ndo_siocwandev = hdlcdev_ioctl,
1683 .ndo_tx_timeout = hdlcdev_tx_timeout,
1684};
1685
1686/**
1687 * hdlcdev_init - called by device driver when adding device instance
1688 * @info: pointer to device instance information
1689 *
1690 * Do generic HDLC initialization.
1691 *
1692 * Return: 0 if success, otherwise error code
1693 */
1694static int hdlcdev_init(struct slgt_info *info)
1695{
1696 int rc;
1697 struct net_device *dev;
1698 hdlc_device *hdlc;
1699
1700 /* allocate and initialize network and HDLC layer objects */
1701
1702 dev = alloc_hdlcdev(info);
1703 if (!dev) {
1704 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1705 return -ENOMEM;
1706 }
1707
1708 /* for network layer reporting purposes only */
1709 dev->mem_start = info->phys_reg_addr;
1710 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1711 dev->irq = info->irq_level;
1712
1713 /* network layer callbacks and settings */
1714 dev->netdev_ops = &hdlcdev_ops;
1715 dev->watchdog_timeo = 10 * HZ;
1716 dev->tx_queue_len = 50;
1717
1718 /* generic HDLC layer callbacks and settings */
1719 hdlc = dev_to_hdlc(dev);
1720 hdlc->attach = hdlcdev_attach;
1721 hdlc->xmit = hdlcdev_xmit;
1722
1723 /* register objects with HDLC layer */
1724 rc = register_hdlc_device(dev);
1725 if (rc) {
1726 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1727 free_netdev(dev);
1728 return rc;
1729 }
1730
1731 info->netdev = dev;
1732 return 0;
1733}
1734
1735/**
1736 * hdlcdev_exit - called by device driver when removing device instance
1737 * @info: pointer to device instance information
1738 *
1739 * Do generic HDLC cleanup.
1740 */
1741static void hdlcdev_exit(struct slgt_info *info)
1742{
1743 if (!info->netdev)
1744 return;
1745 unregister_hdlc_device(info->netdev);
1746 free_netdev(info->netdev);
1747 info->netdev = NULL;
1748}
1749
1750#endif /* ifdef CONFIG_HDLC */
1751
1752/*
1753 * get async data from rx DMA buffers
1754 */
1755static void rx_async(struct slgt_info *info)
1756{
1757 struct mgsl_icount *icount = &info->icount;
1758 unsigned int start, end;
1759 unsigned char *p;
1760 unsigned char status;
1761 struct slgt_desc *bufs = info->rbufs;
1762 int i, count;
1763 int chars = 0;
1764 int stat;
1765 unsigned char ch;
1766
1767 start = end = info->rbuf_current;
1768
1769 while(desc_complete(bufs[end])) {
1770 count = desc_count(bufs[end]) - info->rbuf_index;
1771 p = bufs[end].buf + info->rbuf_index;
1772
1773 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1774 DBGDATA(info, p, count, "rx");
1775
1776 for(i=0 ; i < count; i+=2, p+=2) {
1777 ch = *p;
1778 icount->rx++;
1779
1780 stat = 0;
1781
1782 status = *(p + 1) & (BIT1 + BIT0);
1783 if (status) {
1784 if (status & BIT1)
1785 icount->parity++;
1786 else if (status & BIT0)
1787 icount->frame++;
1788 /* discard char if tty control flags say so */
1789 if (status & info->ignore_status_mask)
1790 continue;
1791 if (status & BIT1)
1792 stat = TTY_PARITY;
1793 else if (status & BIT0)
1794 stat = TTY_FRAME;
1795 }
1796 tty_insert_flip_char(&info->port, ch, stat);
1797 chars++;
1798 }
1799
1800 if (i < count) {
1801 /* receive buffer not completed */
1802 info->rbuf_index += i;
1803 mod_timer(&info->rx_timer, jiffies + 1);
1804 break;
1805 }
1806
1807 info->rbuf_index = 0;
1808 free_rbufs(info, end, end);
1809
1810 if (++end == info->rbuf_count)
1811 end = 0;
1812
1813 /* if entire list searched then no frame available */
1814 if (end == start)
1815 break;
1816 }
1817
1818 if (chars)
1819 tty_flip_buffer_push(&info->port);
1820}
1821
1822/*
1823 * return next bottom half action to perform
1824 */
1825static int bh_action(struct slgt_info *info)
1826{
1827 unsigned long flags;
1828 int rc;
1829
1830 spin_lock_irqsave(&info->lock,flags);
1831
1832 if (info->pending_bh & BH_RECEIVE) {
1833 info->pending_bh &= ~BH_RECEIVE;
1834 rc = BH_RECEIVE;
1835 } else if (info->pending_bh & BH_TRANSMIT) {
1836 info->pending_bh &= ~BH_TRANSMIT;
1837 rc = BH_TRANSMIT;
1838 } else if (info->pending_bh & BH_STATUS) {
1839 info->pending_bh &= ~BH_STATUS;
1840 rc = BH_STATUS;
1841 } else {
1842 /* Mark BH routine as complete */
1843 info->bh_running = false;
1844 info->bh_requested = false;
1845 rc = 0;
1846 }
1847
1848 spin_unlock_irqrestore(&info->lock,flags);
1849
1850 return rc;
1851}
1852
1853/*
1854 * perform bottom half processing
1855 */
1856static void bh_handler(struct work_struct *work)
1857{
1858 struct slgt_info *info = container_of(work, struct slgt_info, task);
1859 int action;
1860
1861 info->bh_running = true;
1862
1863 while((action = bh_action(info))) {
1864 switch (action) {
1865 case BH_RECEIVE:
1866 DBGBH(("%s bh receive\n", info->device_name));
1867 switch(info->params.mode) {
1868 case MGSL_MODE_ASYNC:
1869 rx_async(info);
1870 break;
1871 case MGSL_MODE_HDLC:
1872 while(rx_get_frame(info));
1873 break;
1874 case MGSL_MODE_RAW:
1875 case MGSL_MODE_MONOSYNC:
1876 case MGSL_MODE_BISYNC:
1877 case MGSL_MODE_XSYNC:
1878 while(rx_get_buf(info));
1879 break;
1880 }
1881 /* restart receiver if rx DMA buffers exhausted */
1882 if (info->rx_restart)
1883 rx_start(info);
1884 break;
1885 case BH_TRANSMIT:
1886 bh_transmit(info);
1887 break;
1888 case BH_STATUS:
1889 DBGBH(("%s bh status\n", info->device_name));
1890 info->ri_chkcount = 0;
1891 info->dsr_chkcount = 0;
1892 info->dcd_chkcount = 0;
1893 info->cts_chkcount = 0;
1894 break;
1895 default:
1896 DBGBH(("%s unknown action\n", info->device_name));
1897 break;
1898 }
1899 }
1900 DBGBH(("%s bh_handler exit\n", info->device_name));
1901}
1902
1903static void bh_transmit(struct slgt_info *info)
1904{
1905 struct tty_struct *tty = info->port.tty;
1906
1907 DBGBH(("%s bh_transmit\n", info->device_name));
1908 if (tty)
1909 tty_wakeup(tty);
1910}
1911
1912static void dsr_change(struct slgt_info *info, unsigned short status)
1913{
1914 if (status & BIT3) {
1915 info->signals |= SerialSignal_DSR;
1916 info->input_signal_events.dsr_up++;
1917 } else {
1918 info->signals &= ~SerialSignal_DSR;
1919 info->input_signal_events.dsr_down++;
1920 }
1921 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
1922 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1923 slgt_irq_off(info, IRQ_DSR);
1924 return;
1925 }
1926 info->icount.dsr++;
1927 wake_up_interruptible(&info->status_event_wait_q);
1928 wake_up_interruptible(&info->event_wait_q);
1929 info->pending_bh |= BH_STATUS;
1930}
1931
1932static void cts_change(struct slgt_info *info, unsigned short status)
1933{
1934 if (status & BIT2) {
1935 info->signals |= SerialSignal_CTS;
1936 info->input_signal_events.cts_up++;
1937 } else {
1938 info->signals &= ~SerialSignal_CTS;
1939 info->input_signal_events.cts_down++;
1940 }
1941 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
1942 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1943 slgt_irq_off(info, IRQ_CTS);
1944 return;
1945 }
1946 info->icount.cts++;
1947 wake_up_interruptible(&info->status_event_wait_q);
1948 wake_up_interruptible(&info->event_wait_q);
1949 info->pending_bh |= BH_STATUS;
1950
1951 if (tty_port_cts_enabled(&info->port)) {
1952 if (info->port.tty) {
1953 if (info->port.tty->hw_stopped) {
1954 if (info->signals & SerialSignal_CTS) {
1955 info->port.tty->hw_stopped = false;
1956 info->pending_bh |= BH_TRANSMIT;
1957 return;
1958 }
1959 } else {
1960 if (!(info->signals & SerialSignal_CTS))
1961 info->port.tty->hw_stopped = true;
1962 }
1963 }
1964 }
1965}
1966
1967static void dcd_change(struct slgt_info *info, unsigned short status)
1968{
1969 if (status & BIT1) {
1970 info->signals |= SerialSignal_DCD;
1971 info->input_signal_events.dcd_up++;
1972 } else {
1973 info->signals &= ~SerialSignal_DCD;
1974 info->input_signal_events.dcd_down++;
1975 }
1976 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
1977 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1978 slgt_irq_off(info, IRQ_DCD);
1979 return;
1980 }
1981 info->icount.dcd++;
1982#if SYNCLINK_GENERIC_HDLC
1983 if (info->netcount) {
1984 if (info->signals & SerialSignal_DCD)
1985 netif_carrier_on(info->netdev);
1986 else
1987 netif_carrier_off(info->netdev);
1988 }
1989#endif
1990 wake_up_interruptible(&info->status_event_wait_q);
1991 wake_up_interruptible(&info->event_wait_q);
1992 info->pending_bh |= BH_STATUS;
1993
1994 if (tty_port_check_carrier(&info->port)) {
1995 if (info->signals & SerialSignal_DCD)
1996 wake_up_interruptible(&info->port.open_wait);
1997 else {
1998 if (info->port.tty)
1999 tty_hangup(info->port.tty);
2000 }
2001 }
2002}
2003
2004static void ri_change(struct slgt_info *info, unsigned short status)
2005{
2006 if (status & BIT0) {
2007 info->signals |= SerialSignal_RI;
2008 info->input_signal_events.ri_up++;
2009 } else {
2010 info->signals &= ~SerialSignal_RI;
2011 info->input_signal_events.ri_down++;
2012 }
2013 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2014 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2015 slgt_irq_off(info, IRQ_RI);
2016 return;
2017 }
2018 info->icount.rng++;
2019 wake_up_interruptible(&info->status_event_wait_q);
2020 wake_up_interruptible(&info->event_wait_q);
2021 info->pending_bh |= BH_STATUS;
2022}
2023
2024static void isr_rxdata(struct slgt_info *info)
2025{
2026 unsigned int count = info->rbuf_fill_count;
2027 unsigned int i = info->rbuf_fill_index;
2028 unsigned short reg;
2029
2030 while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2031 reg = rd_reg16(info, RDR);
2032 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2033 if (desc_complete(info->rbufs[i])) {
2034 /* all buffers full */
2035 rx_stop(info);
2036 info->rx_restart = true;
2037 continue;
2038 }
2039 info->rbufs[i].buf[count++] = (unsigned char)reg;
2040 /* async mode saves status byte to buffer for each data byte */
2041 if (info->params.mode == MGSL_MODE_ASYNC)
2042 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2043 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2044 /* buffer full or end of frame */
2045 set_desc_count(info->rbufs[i], count);
2046 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2047 info->rbuf_fill_count = count = 0;
2048 if (++i == info->rbuf_count)
2049 i = 0;
2050 info->pending_bh |= BH_RECEIVE;
2051 }
2052 }
2053
2054 info->rbuf_fill_index = i;
2055 info->rbuf_fill_count = count;
2056}
2057
2058static void isr_serial(struct slgt_info *info)
2059{
2060 unsigned short status = rd_reg16(info, SSR);
2061
2062 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2063
2064 wr_reg16(info, SSR, status); /* clear pending */
2065
2066 info->irq_occurred = true;
2067
2068 if (info->params.mode == MGSL_MODE_ASYNC) {
2069 if (status & IRQ_TXIDLE) {
2070 if (info->tx_active)
2071 isr_txeom(info, status);
2072 }
2073 if (info->rx_pio && (status & IRQ_RXDATA))
2074 isr_rxdata(info);
2075 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2076 info->icount.brk++;
2077 /* process break detection if tty control allows */
2078 if (info->port.tty) {
2079 if (!(status & info->ignore_status_mask)) {
2080 if (info->read_status_mask & MASK_BREAK) {
2081 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2082 if (info->port.flags & ASYNC_SAK)
2083 do_SAK(info->port.tty);
2084 }
2085 }
2086 }
2087 }
2088 } else {
2089 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2090 isr_txeom(info, status);
2091 if (info->rx_pio && (status & IRQ_RXDATA))
2092 isr_rxdata(info);
2093 if (status & IRQ_RXIDLE) {
2094 if (status & RXIDLE)
2095 info->icount.rxidle++;
2096 else
2097 info->icount.exithunt++;
2098 wake_up_interruptible(&info->event_wait_q);
2099 }
2100
2101 if (status & IRQ_RXOVER)
2102 rx_start(info);
2103 }
2104
2105 if (status & IRQ_DSR)
2106 dsr_change(info, status);
2107 if (status & IRQ_CTS)
2108 cts_change(info, status);
2109 if (status & IRQ_DCD)
2110 dcd_change(info, status);
2111 if (status & IRQ_RI)
2112 ri_change(info, status);
2113}
2114
2115static void isr_rdma(struct slgt_info *info)
2116{
2117 unsigned int status = rd_reg32(info, RDCSR);
2118
2119 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2120
2121 /* RDCSR (rx DMA control/status)
2122 *
2123 * 31..07 reserved
2124 * 06 save status byte to DMA buffer
2125 * 05 error
2126 * 04 eol (end of list)
2127 * 03 eob (end of buffer)
2128 * 02 IRQ enable
2129 * 01 reset
2130 * 00 enable
2131 */
2132 wr_reg32(info, RDCSR, status); /* clear pending */
2133
2134 if (status & (BIT5 + BIT4)) {
2135 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2136 info->rx_restart = true;
2137 }
2138 info->pending_bh |= BH_RECEIVE;
2139}
2140
2141static void isr_tdma(struct slgt_info *info)
2142{
2143 unsigned int status = rd_reg32(info, TDCSR);
2144
2145 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2146
2147 /* TDCSR (tx DMA control/status)
2148 *
2149 * 31..06 reserved
2150 * 05 error
2151 * 04 eol (end of list)
2152 * 03 eob (end of buffer)
2153 * 02 IRQ enable
2154 * 01 reset
2155 * 00 enable
2156 */
2157 wr_reg32(info, TDCSR, status); /* clear pending */
2158
2159 if (status & (BIT5 + BIT4 + BIT3)) {
2160 // another transmit buffer has completed
2161 // run bottom half to get more send data from user
2162 info->pending_bh |= BH_TRANSMIT;
2163 }
2164}
2165
2166/*
2167 * return true if there are unsent tx DMA buffers, otherwise false
2168 *
2169 * if there are unsent buffers then info->tbuf_start
2170 * is set to index of first unsent buffer
2171 */
2172static bool unsent_tbufs(struct slgt_info *info)
2173{
2174 unsigned int i = info->tbuf_current;
2175 bool rc = false;
2176
2177 /*
2178 * search backwards from last loaded buffer (precedes tbuf_current)
2179 * for first unsent buffer (desc_count > 0)
2180 */
2181
2182 do {
2183 if (i)
2184 i--;
2185 else
2186 i = info->tbuf_count - 1;
2187 if (!desc_count(info->tbufs[i]))
2188 break;
2189 info->tbuf_start = i;
2190 rc = true;
2191 } while (i != info->tbuf_current);
2192
2193 return rc;
2194}
2195
2196static void isr_txeom(struct slgt_info *info, unsigned short status)
2197{
2198 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2199
2200 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2201 tdma_reset(info);
2202 if (status & IRQ_TXUNDER) {
2203 unsigned short val = rd_reg16(info, TCR);
2204 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2205 wr_reg16(info, TCR, val); /* clear reset bit */
2206 }
2207
2208 if (info->tx_active) {
2209 if (info->params.mode != MGSL_MODE_ASYNC) {
2210 if (status & IRQ_TXUNDER)
2211 info->icount.txunder++;
2212 else if (status & IRQ_TXIDLE)
2213 info->icount.txok++;
2214 }
2215
2216 if (unsent_tbufs(info)) {
2217 tx_start(info);
2218 update_tx_timer(info);
2219 return;
2220 }
2221 info->tx_active = false;
2222
2223 del_timer(&info->tx_timer);
2224
2225 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2226 info->signals &= ~SerialSignal_RTS;
2227 info->drop_rts_on_tx_done = false;
2228 set_gtsignals(info);
2229 }
2230
2231#if SYNCLINK_GENERIC_HDLC
2232 if (info->netcount)
2233 hdlcdev_tx_done(info);
2234 else
2235#endif
2236 {
2237 if (info->port.tty && (info->port.tty->flow.stopped || info->port.tty->hw_stopped)) {
2238 tx_stop(info);
2239 return;
2240 }
2241 info->pending_bh |= BH_TRANSMIT;
2242 }
2243 }
2244}
2245
2246static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2247{
2248 struct cond_wait *w, *prev;
2249
2250 /* wake processes waiting for specific transitions */
2251 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2252 if (w->data & changed) {
2253 w->data = state;
2254 wake_up_interruptible(&w->q);
2255 if (prev != NULL)
2256 prev->next = w->next;
2257 else
2258 info->gpio_wait_q = w->next;
2259 } else
2260 prev = w;
2261 }
2262}
2263
2264/* interrupt service routine
2265 *
2266 * irq interrupt number
2267 * dev_id device ID supplied during interrupt registration
2268 */
2269static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2270{
2271 struct slgt_info *info = dev_id;
2272 unsigned int gsr;
2273 unsigned int i;
2274
2275 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2276
2277 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2278 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2279 info->irq_occurred = true;
2280 for(i=0; i < info->port_count ; i++) {
2281 if (info->port_array[i] == NULL)
2282 continue;
2283 spin_lock(&info->port_array[i]->lock);
2284 if (gsr & (BIT8 << i))
2285 isr_serial(info->port_array[i]);
2286 if (gsr & (BIT16 << (i*2)))
2287 isr_rdma(info->port_array[i]);
2288 if (gsr & (BIT17 << (i*2)))
2289 isr_tdma(info->port_array[i]);
2290 spin_unlock(&info->port_array[i]->lock);
2291 }
2292 }
2293
2294 if (info->gpio_present) {
2295 unsigned int state;
2296 unsigned int changed;
2297 spin_lock(&info->lock);
2298 while ((changed = rd_reg32(info, IOSR)) != 0) {
2299 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2300 /* read latched state of GPIO signals */
2301 state = rd_reg32(info, IOVR);
2302 /* clear pending GPIO interrupt bits */
2303 wr_reg32(info, IOSR, changed);
2304 for (i=0 ; i < info->port_count ; i++) {
2305 if (info->port_array[i] != NULL)
2306 isr_gpio(info->port_array[i], changed, state);
2307 }
2308 }
2309 spin_unlock(&info->lock);
2310 }
2311
2312 for(i=0; i < info->port_count ; i++) {
2313 struct slgt_info *port = info->port_array[i];
2314 if (port == NULL)
2315 continue;
2316 spin_lock(&port->lock);
2317 if ((port->port.count || port->netcount) &&
2318 port->pending_bh && !port->bh_running &&
2319 !port->bh_requested) {
2320 DBGISR(("%s bh queued\n", port->device_name));
2321 schedule_work(&port->task);
2322 port->bh_requested = true;
2323 }
2324 spin_unlock(&port->lock);
2325 }
2326
2327 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2328 return IRQ_HANDLED;
2329}
2330
2331static int startup(struct slgt_info *info)
2332{
2333 DBGINFO(("%s startup\n", info->device_name));
2334
2335 if (tty_port_initialized(&info->port))
2336 return 0;
2337
2338 if (!info->tx_buf) {
2339 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2340 if (!info->tx_buf) {
2341 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2342 return -ENOMEM;
2343 }
2344 }
2345
2346 info->pending_bh = 0;
2347
2348 memset(&info->icount, 0, sizeof(info->icount));
2349
2350 /* program hardware for current parameters */
2351 change_params(info);
2352
2353 if (info->port.tty)
2354 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2355
2356 tty_port_set_initialized(&info->port, true);
2357
2358 return 0;
2359}
2360
2361/*
2362 * called by close() and hangup() to shutdown hardware
2363 */
2364static void shutdown(struct slgt_info *info)
2365{
2366 unsigned long flags;
2367
2368 if (!tty_port_initialized(&info->port))
2369 return;
2370
2371 DBGINFO(("%s shutdown\n", info->device_name));
2372
2373 /* clear status wait queue because status changes */
2374 /* can't happen after shutting down the hardware */
2375 wake_up_interruptible(&info->status_event_wait_q);
2376 wake_up_interruptible(&info->event_wait_q);
2377
2378 del_timer_sync(&info->tx_timer);
2379 del_timer_sync(&info->rx_timer);
2380
2381 kfree(info->tx_buf);
2382 info->tx_buf = NULL;
2383
2384 spin_lock_irqsave(&info->lock,flags);
2385
2386 tx_stop(info);
2387 rx_stop(info);
2388
2389 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2390
2391 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2392 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2393 set_gtsignals(info);
2394 }
2395
2396 flush_cond_wait(&info->gpio_wait_q);
2397
2398 spin_unlock_irqrestore(&info->lock,flags);
2399
2400 if (info->port.tty)
2401 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2402
2403 tty_port_set_initialized(&info->port, false);
2404}
2405
2406static void program_hw(struct slgt_info *info)
2407{
2408 unsigned long flags;
2409
2410 spin_lock_irqsave(&info->lock,flags);
2411
2412 rx_stop(info);
2413 tx_stop(info);
2414
2415 if (info->params.mode != MGSL_MODE_ASYNC ||
2416 info->netcount)
2417 sync_mode(info);
2418 else
2419 async_mode(info);
2420
2421 set_gtsignals(info);
2422
2423 info->dcd_chkcount = 0;
2424 info->cts_chkcount = 0;
2425 info->ri_chkcount = 0;
2426 info->dsr_chkcount = 0;
2427
2428 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2429 get_gtsignals(info);
2430
2431 if (info->netcount ||
2432 (info->port.tty && info->port.tty->termios.c_cflag & CREAD))
2433 rx_start(info);
2434
2435 spin_unlock_irqrestore(&info->lock,flags);
2436}
2437
2438/*
2439 * reconfigure adapter based on new parameters
2440 */
2441static void change_params(struct slgt_info *info)
2442{
2443 unsigned cflag;
2444 int bits_per_char;
2445
2446 if (!info->port.tty)
2447 return;
2448 DBGINFO(("%s change_params\n", info->device_name));
2449
2450 cflag = info->port.tty->termios.c_cflag;
2451
2452 /* if B0 rate (hangup) specified then negate RTS and DTR */
2453 /* otherwise assert RTS and DTR */
2454 if (cflag & CBAUD)
2455 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
2456 else
2457 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2458
2459 /* byte size and parity */
2460
2461 info->params.data_bits = tty_get_char_size(cflag);
2462 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2463
2464 if (cflag & PARENB)
2465 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2466 else
2467 info->params.parity = ASYNC_PARITY_NONE;
2468
2469 /* calculate number of jiffies to transmit a full
2470 * FIFO (32 bytes) at specified data rate
2471 */
2472 bits_per_char = info->params.data_bits +
2473 info->params.stop_bits + 1;
2474
2475 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2476
2477 if (info->params.data_rate) {
2478 info->timeout = (32*HZ*bits_per_char) /
2479 info->params.data_rate;
2480 }
2481 info->timeout += HZ/50; /* Add .02 seconds of slop */
2482
2483 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
2484 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
2485
2486 /* process tty input control flags */
2487
2488 info->read_status_mask = IRQ_RXOVER;
2489 if (I_INPCK(info->port.tty))
2490 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2491 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2492 info->read_status_mask |= MASK_BREAK;
2493 if (I_IGNPAR(info->port.tty))
2494 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2495 if (I_IGNBRK(info->port.tty)) {
2496 info->ignore_status_mask |= MASK_BREAK;
2497 /* If ignoring parity and break indicators, ignore
2498 * overruns too. (For real raw support).
2499 */
2500 if (I_IGNPAR(info->port.tty))
2501 info->ignore_status_mask |= MASK_OVERRUN;
2502 }
2503
2504 program_hw(info);
2505}
2506
2507static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2508{
2509 DBGINFO(("%s get_stats\n", info->device_name));
2510 if (!user_icount) {
2511 memset(&info->icount, 0, sizeof(info->icount));
2512 } else {
2513 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2514 return -EFAULT;
2515 }
2516 return 0;
2517}
2518
2519static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2520{
2521 DBGINFO(("%s get_params\n", info->device_name));
2522 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2523 return -EFAULT;
2524 return 0;
2525}
2526
2527static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2528{
2529 unsigned long flags;
2530 MGSL_PARAMS tmp_params;
2531
2532 DBGINFO(("%s set_params\n", info->device_name));
2533 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2534 return -EFAULT;
2535
2536 spin_lock_irqsave(&info->lock, flags);
2537 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2538 info->base_clock = tmp_params.clock_speed;
2539 else
2540 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2541 spin_unlock_irqrestore(&info->lock, flags);
2542
2543 program_hw(info);
2544
2545 return 0;
2546}
2547
2548static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2549{
2550 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2551 if (put_user(info->idle_mode, idle_mode))
2552 return -EFAULT;
2553 return 0;
2554}
2555
2556static int set_txidle(struct slgt_info *info, int idle_mode)
2557{
2558 unsigned long flags;
2559 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2560 spin_lock_irqsave(&info->lock,flags);
2561 info->idle_mode = idle_mode;
2562 if (info->params.mode != MGSL_MODE_ASYNC)
2563 tx_set_idle(info);
2564 spin_unlock_irqrestore(&info->lock,flags);
2565 return 0;
2566}
2567
2568static int tx_enable(struct slgt_info *info, int enable)
2569{
2570 unsigned long flags;
2571 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2572 spin_lock_irqsave(&info->lock,flags);
2573 if (enable) {
2574 if (!info->tx_enabled)
2575 tx_start(info);
2576 } else {
2577 if (info->tx_enabled)
2578 tx_stop(info);
2579 }
2580 spin_unlock_irqrestore(&info->lock,flags);
2581 return 0;
2582}
2583
2584/*
2585 * abort transmit HDLC frame
2586 */
2587static int tx_abort(struct slgt_info *info)
2588{
2589 unsigned long flags;
2590 DBGINFO(("%s tx_abort\n", info->device_name));
2591 spin_lock_irqsave(&info->lock,flags);
2592 tdma_reset(info);
2593 spin_unlock_irqrestore(&info->lock,flags);
2594 return 0;
2595}
2596
2597static int rx_enable(struct slgt_info *info, int enable)
2598{
2599 unsigned long flags;
2600 unsigned int rbuf_fill_level;
2601 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2602 spin_lock_irqsave(&info->lock,flags);
2603 /*
2604 * enable[31..16] = receive DMA buffer fill level
2605 * 0 = noop (leave fill level unchanged)
2606 * fill level must be multiple of 4 and <= buffer size
2607 */
2608 rbuf_fill_level = ((unsigned int)enable) >> 16;
2609 if (rbuf_fill_level) {
2610 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2611 spin_unlock_irqrestore(&info->lock, flags);
2612 return -EINVAL;
2613 }
2614 info->rbuf_fill_level = rbuf_fill_level;
2615 if (rbuf_fill_level < 128)
2616 info->rx_pio = 1; /* PIO mode */
2617 else
2618 info->rx_pio = 0; /* DMA mode */
2619 rx_stop(info); /* restart receiver to use new fill level */
2620 }
2621
2622 /*
2623 * enable[1..0] = receiver enable command
2624 * 0 = disable
2625 * 1 = enable
2626 * 2 = enable or force hunt mode if already enabled
2627 */
2628 enable &= 3;
2629 if (enable) {
2630 if (!info->rx_enabled)
2631 rx_start(info);
2632 else if (enable == 2) {
2633 /* force hunt mode (write 1 to RCR[3]) */
2634 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2635 }
2636 } else {
2637 if (info->rx_enabled)
2638 rx_stop(info);
2639 }
2640 spin_unlock_irqrestore(&info->lock,flags);
2641 return 0;
2642}
2643
2644/*
2645 * wait for specified event to occur
2646 */
2647static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2648{
2649 unsigned long flags;
2650 int s;
2651 int rc=0;
2652 struct mgsl_icount cprev, cnow;
2653 int events;
2654 int mask;
2655 struct _input_signal_events oldsigs, newsigs;
2656 DECLARE_WAITQUEUE(wait, current);
2657
2658 if (get_user(mask, mask_ptr))
2659 return -EFAULT;
2660
2661 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2662
2663 spin_lock_irqsave(&info->lock,flags);
2664
2665 /* return immediately if state matches requested events */
2666 get_gtsignals(info);
2667 s = info->signals;
2668
2669 events = mask &
2670 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2671 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2672 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2673 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2674 if (events) {
2675 spin_unlock_irqrestore(&info->lock,flags);
2676 goto exit;
2677 }
2678
2679 /* save current irq counts */
2680 cprev = info->icount;
2681 oldsigs = info->input_signal_events;
2682
2683 /* enable hunt and idle irqs if needed */
2684 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2685 unsigned short val = rd_reg16(info, SCR);
2686 if (!(val & IRQ_RXIDLE))
2687 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2688 }
2689
2690 set_current_state(TASK_INTERRUPTIBLE);
2691 add_wait_queue(&info->event_wait_q, &wait);
2692
2693 spin_unlock_irqrestore(&info->lock,flags);
2694
2695 for(;;) {
2696 schedule();
2697 if (signal_pending(current)) {
2698 rc = -ERESTARTSYS;
2699 break;
2700 }
2701
2702 /* get current irq counts */
2703 spin_lock_irqsave(&info->lock,flags);
2704 cnow = info->icount;
2705 newsigs = info->input_signal_events;
2706 set_current_state(TASK_INTERRUPTIBLE);
2707 spin_unlock_irqrestore(&info->lock,flags);
2708
2709 /* if no change, wait aborted for some reason */
2710 if (newsigs.dsr_up == oldsigs.dsr_up &&
2711 newsigs.dsr_down == oldsigs.dsr_down &&
2712 newsigs.dcd_up == oldsigs.dcd_up &&
2713 newsigs.dcd_down == oldsigs.dcd_down &&
2714 newsigs.cts_up == oldsigs.cts_up &&
2715 newsigs.cts_down == oldsigs.cts_down &&
2716 newsigs.ri_up == oldsigs.ri_up &&
2717 newsigs.ri_down == oldsigs.ri_down &&
2718 cnow.exithunt == cprev.exithunt &&
2719 cnow.rxidle == cprev.rxidle) {
2720 rc = -EIO;
2721 break;
2722 }
2723
2724 events = mask &
2725 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2726 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2727 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2728 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2729 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2730 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2731 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2732 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2733 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2734 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2735 if (events)
2736 break;
2737
2738 cprev = cnow;
2739 oldsigs = newsigs;
2740 }
2741
2742 remove_wait_queue(&info->event_wait_q, &wait);
2743 set_current_state(TASK_RUNNING);
2744
2745
2746 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2747 spin_lock_irqsave(&info->lock,flags);
2748 if (!waitqueue_active(&info->event_wait_q)) {
2749 /* disable enable exit hunt mode/idle rcvd IRQs */
2750 wr_reg16(info, SCR,
2751 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2752 }
2753 spin_unlock_irqrestore(&info->lock,flags);
2754 }
2755exit:
2756 if (rc == 0)
2757 rc = put_user(events, mask_ptr);
2758 return rc;
2759}
2760
2761static int get_interface(struct slgt_info *info, int __user *if_mode)
2762{
2763 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2764 if (put_user(info->if_mode, if_mode))
2765 return -EFAULT;
2766 return 0;
2767}
2768
2769static int set_interface(struct slgt_info *info, int if_mode)
2770{
2771 unsigned long flags;
2772 unsigned short val;
2773
2774 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2775 spin_lock_irqsave(&info->lock,flags);
2776 info->if_mode = if_mode;
2777
2778 msc_set_vcr(info);
2779
2780 /* TCR (tx control) 07 1=RTS driver control */
2781 val = rd_reg16(info, TCR);
2782 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2783 val |= BIT7;
2784 else
2785 val &= ~BIT7;
2786 wr_reg16(info, TCR, val);
2787
2788 spin_unlock_irqrestore(&info->lock,flags);
2789 return 0;
2790}
2791
2792static int get_xsync(struct slgt_info *info, int __user *xsync)
2793{
2794 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2795 if (put_user(info->xsync, xsync))
2796 return -EFAULT;
2797 return 0;
2798}
2799
2800/*
2801 * set extended sync pattern (1 to 4 bytes) for extended sync mode
2802 *
2803 * sync pattern is contained in least significant bytes of value
2804 * most significant byte of sync pattern is oldest (1st sent/detected)
2805 */
2806static int set_xsync(struct slgt_info *info, int xsync)
2807{
2808 unsigned long flags;
2809
2810 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2811 spin_lock_irqsave(&info->lock, flags);
2812 info->xsync = xsync;
2813 wr_reg32(info, XSR, xsync);
2814 spin_unlock_irqrestore(&info->lock, flags);
2815 return 0;
2816}
2817
2818static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2819{
2820 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2821 if (put_user(info->xctrl, xctrl))
2822 return -EFAULT;
2823 return 0;
2824}
2825
2826/*
2827 * set extended control options
2828 *
2829 * xctrl[31:19] reserved, must be zero
2830 * xctrl[18:17] extended sync pattern length in bytes
2831 * 00 = 1 byte in xsr[7:0]
2832 * 01 = 2 bytes in xsr[15:0]
2833 * 10 = 3 bytes in xsr[23:0]
2834 * 11 = 4 bytes in xsr[31:0]
2835 * xctrl[16] 1 = enable terminal count, 0=disabled
2836 * xctrl[15:0] receive terminal count for fixed length packets
2837 * value is count minus one (0 = 1 byte packet)
2838 * when terminal count is reached, receiver
2839 * automatically returns to hunt mode and receive
2840 * FIFO contents are flushed to DMA buffers with
2841 * end of frame (EOF) status
2842 */
2843static int set_xctrl(struct slgt_info *info, int xctrl)
2844{
2845 unsigned long flags;
2846
2847 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2848 spin_lock_irqsave(&info->lock, flags);
2849 info->xctrl = xctrl;
2850 wr_reg32(info, XCR, xctrl);
2851 spin_unlock_irqrestore(&info->lock, flags);
2852 return 0;
2853}
2854
2855/*
2856 * set general purpose IO pin state and direction
2857 *
2858 * user_gpio fields:
2859 * state each bit indicates a pin state
2860 * smask set bit indicates pin state to set
2861 * dir each bit indicates a pin direction (0=input, 1=output)
2862 * dmask set bit indicates pin direction to set
2863 */
2864static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2865{
2866 unsigned long flags;
2867 struct gpio_desc gpio;
2868 __u32 data;
2869
2870 if (!info->gpio_present)
2871 return -EINVAL;
2872 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2873 return -EFAULT;
2874 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2875 info->device_name, gpio.state, gpio.smask,
2876 gpio.dir, gpio.dmask));
2877
2878 spin_lock_irqsave(&info->port_array[0]->lock, flags);
2879 if (gpio.dmask) {
2880 data = rd_reg32(info, IODR);
2881 data |= gpio.dmask & gpio.dir;
2882 data &= ~(gpio.dmask & ~gpio.dir);
2883 wr_reg32(info, IODR, data);
2884 }
2885 if (gpio.smask) {
2886 data = rd_reg32(info, IOVR);
2887 data |= gpio.smask & gpio.state;
2888 data &= ~(gpio.smask & ~gpio.state);
2889 wr_reg32(info, IOVR, data);
2890 }
2891 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
2892
2893 return 0;
2894}
2895
2896/*
2897 * get general purpose IO pin state and direction
2898 */
2899static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2900{
2901 struct gpio_desc gpio;
2902 if (!info->gpio_present)
2903 return -EINVAL;
2904 gpio.state = rd_reg32(info, IOVR);
2905 gpio.smask = 0xffffffff;
2906 gpio.dir = rd_reg32(info, IODR);
2907 gpio.dmask = 0xffffffff;
2908 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2909 return -EFAULT;
2910 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2911 info->device_name, gpio.state, gpio.dir));
2912 return 0;
2913}
2914
2915/*
2916 * conditional wait facility
2917 */
2918static void init_cond_wait(struct cond_wait *w, unsigned int data)
2919{
2920 init_waitqueue_head(&w->q);
2921 init_waitqueue_entry(&w->wait, current);
2922 w->data = data;
2923}
2924
2925static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2926{
2927 set_current_state(TASK_INTERRUPTIBLE);
2928 add_wait_queue(&w->q, &w->wait);
2929 w->next = *head;
2930 *head = w;
2931}
2932
2933static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2934{
2935 struct cond_wait *w, *prev;
2936 remove_wait_queue(&cw->q, &cw->wait);
2937 set_current_state(TASK_RUNNING);
2938 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2939 if (w == cw) {
2940 if (prev != NULL)
2941 prev->next = w->next;
2942 else
2943 *head = w->next;
2944 break;
2945 }
2946 }
2947}
2948
2949static void flush_cond_wait(struct cond_wait **head)
2950{
2951 while (*head != NULL) {
2952 wake_up_interruptible(&(*head)->q);
2953 *head = (*head)->next;
2954 }
2955}
2956
2957/*
2958 * wait for general purpose I/O pin(s) to enter specified state
2959 *
2960 * user_gpio fields:
2961 * state - bit indicates target pin state
2962 * smask - set bit indicates watched pin
2963 *
2964 * The wait ends when at least one watched pin enters the specified
2965 * state. When 0 (no error) is returned, user_gpio->state is set to the
2966 * state of all GPIO pins when the wait ends.
2967 *
2968 * Note: Each pin may be a dedicated input, dedicated output, or
2969 * configurable input/output. The number and configuration of pins
2970 * varies with the specific adapter model. Only input pins (dedicated
2971 * or configured) can be monitored with this function.
2972 */
2973static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2974{
2975 unsigned long flags;
2976 int rc = 0;
2977 struct gpio_desc gpio;
2978 struct cond_wait wait;
2979 u32 state;
2980
2981 if (!info->gpio_present)
2982 return -EINVAL;
2983 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2984 return -EFAULT;
2985 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2986 info->device_name, gpio.state, gpio.smask));
2987 /* ignore output pins identified by set IODR bit */
2988 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2989 return -EINVAL;
2990 init_cond_wait(&wait, gpio.smask);
2991
2992 spin_lock_irqsave(&info->port_array[0]->lock, flags);
2993 /* enable interrupts for watched pins */
2994 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
2995 /* get current pin states */
2996 state = rd_reg32(info, IOVR);
2997
2998 if (gpio.smask & ~(state ^ gpio.state)) {
2999 /* already in target state */
3000 gpio.state = state;
3001 } else {
3002 /* wait for target state */
3003 add_cond_wait(&info->gpio_wait_q, &wait);
3004 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3005 schedule();
3006 if (signal_pending(current))
3007 rc = -ERESTARTSYS;
3008 else
3009 gpio.state = wait.data;
3010 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3011 remove_cond_wait(&info->gpio_wait_q, &wait);
3012 }
3013
3014 /* disable all GPIO interrupts if no waiting processes */
3015 if (info->gpio_wait_q == NULL)
3016 wr_reg32(info, IOER, 0);
3017 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3018
3019 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3020 rc = -EFAULT;
3021 return rc;
3022}
3023
3024static int modem_input_wait(struct slgt_info *info,int arg)
3025{
3026 unsigned long flags;
3027 int rc;
3028 struct mgsl_icount cprev, cnow;
3029 DECLARE_WAITQUEUE(wait, current);
3030
3031 /* save current irq counts */
3032 spin_lock_irqsave(&info->lock,flags);
3033 cprev = info->icount;
3034 add_wait_queue(&info->status_event_wait_q, &wait);
3035 set_current_state(TASK_INTERRUPTIBLE);
3036 spin_unlock_irqrestore(&info->lock,flags);
3037
3038 for(;;) {
3039 schedule();
3040 if (signal_pending(current)) {
3041 rc = -ERESTARTSYS;
3042 break;
3043 }
3044
3045 /* get new irq counts */
3046 spin_lock_irqsave(&info->lock,flags);
3047 cnow = info->icount;
3048 set_current_state(TASK_INTERRUPTIBLE);
3049 spin_unlock_irqrestore(&info->lock,flags);
3050
3051 /* if no change, wait aborted for some reason */
3052 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3053 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3054 rc = -EIO;
3055 break;
3056 }
3057
3058 /* check for change in caller specified modem input */
3059 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3060 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3061 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3062 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3063 rc = 0;
3064 break;
3065 }
3066
3067 cprev = cnow;
3068 }
3069 remove_wait_queue(&info->status_event_wait_q, &wait);
3070 set_current_state(TASK_RUNNING);
3071 return rc;
3072}
3073
3074/*
3075 * return state of serial control and status signals
3076 */
3077static int tiocmget(struct tty_struct *tty)
3078{
3079 struct slgt_info *info = tty->driver_data;
3080 unsigned int result;
3081 unsigned long flags;
3082
3083 spin_lock_irqsave(&info->lock,flags);
3084 get_gtsignals(info);
3085 spin_unlock_irqrestore(&info->lock,flags);
3086
3087 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3088 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3089 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3090 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3091 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3092 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3093
3094 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3095 return result;
3096}
3097
3098/*
3099 * set modem control signals (DTR/RTS)
3100 *
3101 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3102 * TIOCMSET = set/clear signal values
3103 * value bit mask for command
3104 */
3105static int tiocmset(struct tty_struct *tty,
3106 unsigned int set, unsigned int clear)
3107{
3108 struct slgt_info *info = tty->driver_data;
3109 unsigned long flags;
3110
3111 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3112
3113 if (set & TIOCM_RTS)
3114 info->signals |= SerialSignal_RTS;
3115 if (set & TIOCM_DTR)
3116 info->signals |= SerialSignal_DTR;
3117 if (clear & TIOCM_RTS)
3118 info->signals &= ~SerialSignal_RTS;
3119 if (clear & TIOCM_DTR)
3120 info->signals &= ~SerialSignal_DTR;
3121
3122 spin_lock_irqsave(&info->lock,flags);
3123 set_gtsignals(info);
3124 spin_unlock_irqrestore(&info->lock,flags);
3125 return 0;
3126}
3127
3128static bool carrier_raised(struct tty_port *port)
3129{
3130 unsigned long flags;
3131 struct slgt_info *info = container_of(port, struct slgt_info, port);
3132
3133 spin_lock_irqsave(&info->lock,flags);
3134 get_gtsignals(info);
3135 spin_unlock_irqrestore(&info->lock,flags);
3136
3137 return info->signals & SerialSignal_DCD;
3138}
3139
3140static void dtr_rts(struct tty_port *port, bool active)
3141{
3142 unsigned long flags;
3143 struct slgt_info *info = container_of(port, struct slgt_info, port);
3144
3145 spin_lock_irqsave(&info->lock,flags);
3146 if (active)
3147 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
3148 else
3149 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3150 set_gtsignals(info);
3151 spin_unlock_irqrestore(&info->lock,flags);
3152}
3153
3154
3155/*
3156 * block current process until the device is ready to open
3157 */
3158static int block_til_ready(struct tty_struct *tty, struct file *filp,
3159 struct slgt_info *info)
3160{
3161 DECLARE_WAITQUEUE(wait, current);
3162 int retval;
3163 bool do_clocal = false;
3164 unsigned long flags;
3165 bool cd;
3166 struct tty_port *port = &info->port;
3167
3168 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3169
3170 if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
3171 /* nonblock mode is set or port is not enabled */
3172 tty_port_set_active(port, true);
3173 return 0;
3174 }
3175
3176 if (C_CLOCAL(tty))
3177 do_clocal = true;
3178
3179 /* Wait for carrier detect and the line to become
3180 * free (i.e., not in use by the callout). While we are in
3181 * this loop, port->count is dropped by one, so that
3182 * close() knows when to free things. We restore it upon
3183 * exit, either normal or abnormal.
3184 */
3185
3186 retval = 0;
3187 add_wait_queue(&port->open_wait, &wait);
3188
3189 spin_lock_irqsave(&info->lock, flags);
3190 port->count--;
3191 spin_unlock_irqrestore(&info->lock, flags);
3192 port->blocked_open++;
3193
3194 while (1) {
3195 if (C_BAUD(tty) && tty_port_initialized(port))
3196 tty_port_raise_dtr_rts(port);
3197
3198 set_current_state(TASK_INTERRUPTIBLE);
3199
3200 if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
3201 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3202 -EAGAIN : -ERESTARTSYS;
3203 break;
3204 }
3205
3206 cd = tty_port_carrier_raised(port);
3207 if (do_clocal || cd)
3208 break;
3209
3210 if (signal_pending(current)) {
3211 retval = -ERESTARTSYS;
3212 break;
3213 }
3214
3215 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3216 tty_unlock(tty);
3217 schedule();
3218 tty_lock(tty);
3219 }
3220
3221 set_current_state(TASK_RUNNING);
3222 remove_wait_queue(&port->open_wait, &wait);
3223
3224 if (!tty_hung_up_p(filp))
3225 port->count++;
3226 port->blocked_open--;
3227
3228 if (!retval)
3229 tty_port_set_active(port, true);
3230
3231 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3232 return retval;
3233}
3234
3235/*
3236 * allocate buffers used for calling line discipline receive_buf
3237 * directly in synchronous mode
3238 * note: add 5 bytes to max frame size to allow appending
3239 * 32-bit CRC and status byte when configured to do so
3240 */
3241static int alloc_tmp_rbuf(struct slgt_info *info)
3242{
3243 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3244 if (info->tmp_rbuf == NULL)
3245 return -ENOMEM;
3246
3247 return 0;
3248}
3249
3250static void free_tmp_rbuf(struct slgt_info *info)
3251{
3252 kfree(info->tmp_rbuf);
3253 info->tmp_rbuf = NULL;
3254}
3255
3256/*
3257 * allocate DMA descriptor lists.
3258 */
3259static int alloc_desc(struct slgt_info *info)
3260{
3261 unsigned int i;
3262 unsigned int pbufs;
3263
3264 /* allocate memory to hold descriptor lists */
3265 info->bufs = dma_alloc_coherent(&info->pdev->dev, DESC_LIST_SIZE,
3266 &info->bufs_dma_addr, GFP_KERNEL);
3267 if (info->bufs == NULL)
3268 return -ENOMEM;
3269
3270 info->rbufs = (struct slgt_desc*)info->bufs;
3271 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3272
3273 pbufs = (unsigned int)info->bufs_dma_addr;
3274
3275 /*
3276 * Build circular lists of descriptors
3277 */
3278
3279 for (i=0; i < info->rbuf_count; i++) {
3280 /* physical address of this descriptor */
3281 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3282
3283 /* physical address of next descriptor */
3284 if (i == info->rbuf_count - 1)
3285 info->rbufs[i].next = cpu_to_le32(pbufs);
3286 else
3287 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3288 set_desc_count(info->rbufs[i], DMABUFSIZE);
3289 }
3290
3291 for (i=0; i < info->tbuf_count; i++) {
3292 /* physical address of this descriptor */
3293 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3294
3295 /* physical address of next descriptor */
3296 if (i == info->tbuf_count - 1)
3297 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3298 else
3299 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3300 }
3301
3302 return 0;
3303}
3304
3305static void free_desc(struct slgt_info *info)
3306{
3307 if (info->bufs != NULL) {
3308 dma_free_coherent(&info->pdev->dev, DESC_LIST_SIZE,
3309 info->bufs, info->bufs_dma_addr);
3310 info->bufs = NULL;
3311 info->rbufs = NULL;
3312 info->tbufs = NULL;
3313 }
3314}
3315
3316static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3317{
3318 int i;
3319 for (i=0; i < count; i++) {
3320 bufs[i].buf = dma_alloc_coherent(&info->pdev->dev, DMABUFSIZE,
3321 &bufs[i].buf_dma_addr, GFP_KERNEL);
3322 if (!bufs[i].buf)
3323 return -ENOMEM;
3324 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3325 }
3326 return 0;
3327}
3328
3329static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3330{
3331 int i;
3332 for (i=0; i < count; i++) {
3333 if (bufs[i].buf == NULL)
3334 continue;
3335 dma_free_coherent(&info->pdev->dev, DMABUFSIZE, bufs[i].buf,
3336 bufs[i].buf_dma_addr);
3337 bufs[i].buf = NULL;
3338 }
3339}
3340
3341static int alloc_dma_bufs(struct slgt_info *info)
3342{
3343 info->rbuf_count = 32;
3344 info->tbuf_count = 32;
3345
3346 if (alloc_desc(info) < 0 ||
3347 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3348 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3349 alloc_tmp_rbuf(info) < 0) {
3350 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3351 return -ENOMEM;
3352 }
3353 reset_rbufs(info);
3354 return 0;
3355}
3356
3357static void free_dma_bufs(struct slgt_info *info)
3358{
3359 if (info->bufs) {
3360 free_bufs(info, info->rbufs, info->rbuf_count);
3361 free_bufs(info, info->tbufs, info->tbuf_count);
3362 free_desc(info);
3363 }
3364 free_tmp_rbuf(info);
3365}
3366
3367static int claim_resources(struct slgt_info *info)
3368{
3369 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3370 DBGERR(("%s reg addr conflict, addr=%08X\n",
3371 info->device_name, info->phys_reg_addr));
3372 info->init_error = DiagStatus_AddressConflict;
3373 goto errout;
3374 }
3375 else
3376 info->reg_addr_requested = true;
3377
3378 info->reg_addr = ioremap(info->phys_reg_addr, SLGT_REG_SIZE);
3379 if (!info->reg_addr) {
3380 DBGERR(("%s can't map device registers, addr=%08X\n",
3381 info->device_name, info->phys_reg_addr));
3382 info->init_error = DiagStatus_CantAssignPciResources;
3383 goto errout;
3384 }
3385 return 0;
3386
3387errout:
3388 release_resources(info);
3389 return -ENODEV;
3390}
3391
3392static void release_resources(struct slgt_info *info)
3393{
3394 if (info->irq_requested) {
3395 free_irq(info->irq_level, info);
3396 info->irq_requested = false;
3397 }
3398
3399 if (info->reg_addr_requested) {
3400 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3401 info->reg_addr_requested = false;
3402 }
3403
3404 if (info->reg_addr) {
3405 iounmap(info->reg_addr);
3406 info->reg_addr = NULL;
3407 }
3408}
3409
3410/* Add the specified device instance data structure to the
3411 * global linked list of devices and increment the device count.
3412 */
3413static void add_device(struct slgt_info *info)
3414{
3415 char *devstr;
3416
3417 info->next_device = NULL;
3418 info->line = slgt_device_count;
3419 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3420
3421 if (info->line < MAX_DEVICES) {
3422 if (maxframe[info->line])
3423 info->max_frame_size = maxframe[info->line];
3424 }
3425
3426 slgt_device_count++;
3427
3428 if (!slgt_device_list)
3429 slgt_device_list = info;
3430 else {
3431 struct slgt_info *current_dev = slgt_device_list;
3432 while(current_dev->next_device)
3433 current_dev = current_dev->next_device;
3434 current_dev->next_device = info;
3435 }
3436
3437 if (info->max_frame_size < 4096)
3438 info->max_frame_size = 4096;
3439 else if (info->max_frame_size > 65535)
3440 info->max_frame_size = 65535;
3441
3442 switch(info->pdev->device) {
3443 case SYNCLINK_GT_DEVICE_ID:
3444 devstr = "GT";
3445 break;
3446 case SYNCLINK_GT2_DEVICE_ID:
3447 devstr = "GT2";
3448 break;
3449 case SYNCLINK_GT4_DEVICE_ID:
3450 devstr = "GT4";
3451 break;
3452 case SYNCLINK_AC_DEVICE_ID:
3453 devstr = "AC";
3454 info->params.mode = MGSL_MODE_ASYNC;
3455 break;
3456 default:
3457 devstr = "(unknown model)";
3458 }
3459 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3460 devstr, info->device_name, info->phys_reg_addr,
3461 info->irq_level, info->max_frame_size);
3462
3463#if SYNCLINK_GENERIC_HDLC
3464 hdlcdev_init(info);
3465#endif
3466}
3467
3468static const struct tty_port_operations slgt_port_ops = {
3469 .carrier_raised = carrier_raised,
3470 .dtr_rts = dtr_rts,
3471};
3472
3473/*
3474 * allocate device instance structure, return NULL on failure
3475 */
3476static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3477{
3478 struct slgt_info *info;
3479
3480 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3481
3482 if (!info) {
3483 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3484 driver_name, adapter_num, port_num));
3485 } else {
3486 tty_port_init(&info->port);
3487 info->port.ops = &slgt_port_ops;
3488 INIT_WORK(&info->task, bh_handler);
3489 info->max_frame_size = 4096;
3490 info->base_clock = 14745600;
3491 info->rbuf_fill_level = DMABUFSIZE;
3492 init_waitqueue_head(&info->status_event_wait_q);
3493 init_waitqueue_head(&info->event_wait_q);
3494 spin_lock_init(&info->netlock);
3495 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3496 info->idle_mode = HDLC_TXIDLE_FLAGS;
3497 info->adapter_num = adapter_num;
3498 info->port_num = port_num;
3499
3500 timer_setup(&info->tx_timer, tx_timeout, 0);
3501 timer_setup(&info->rx_timer, rx_timeout, 0);
3502
3503 /* Copy configuration info to device instance data */
3504 info->pdev = pdev;
3505 info->irq_level = pdev->irq;
3506 info->phys_reg_addr = pci_resource_start(pdev,0);
3507
3508 info->bus_type = MGSL_BUS_TYPE_PCI;
3509 info->irq_flags = IRQF_SHARED;
3510
3511 info->init_error = -1; /* assume error, set to 0 on successful init */
3512 }
3513
3514 return info;
3515}
3516
3517static void device_init(int adapter_num, struct pci_dev *pdev)
3518{
3519 struct slgt_info *port_array[SLGT_MAX_PORTS];
3520 int i;
3521 int port_count = 1;
3522
3523 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3524 port_count = 2;
3525 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3526 port_count = 4;
3527
3528 /* allocate device instances for all ports */
3529 for (i=0; i < port_count; ++i) {
3530 port_array[i] = alloc_dev(adapter_num, i, pdev);
3531 if (port_array[i] == NULL) {
3532 for (--i; i >= 0; --i) {
3533 tty_port_destroy(&port_array[i]->port);
3534 kfree(port_array[i]);
3535 }
3536 return;
3537 }
3538 }
3539
3540 /* give copy of port_array to all ports and add to device list */
3541 for (i=0; i < port_count; ++i) {
3542 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3543 add_device(port_array[i]);
3544 port_array[i]->port_count = port_count;
3545 spin_lock_init(&port_array[i]->lock);
3546 }
3547
3548 /* Allocate and claim adapter resources */
3549 if (!claim_resources(port_array[0])) {
3550
3551 alloc_dma_bufs(port_array[0]);
3552
3553 /* copy resource information from first port to others */
3554 for (i = 1; i < port_count; ++i) {
3555 port_array[i]->irq_level = port_array[0]->irq_level;
3556 port_array[i]->reg_addr = port_array[0]->reg_addr;
3557 alloc_dma_bufs(port_array[i]);
3558 }
3559
3560 if (request_irq(port_array[0]->irq_level,
3561 slgt_interrupt,
3562 port_array[0]->irq_flags,
3563 port_array[0]->device_name,
3564 port_array[0]) < 0) {
3565 DBGERR(("%s request_irq failed IRQ=%d\n",
3566 port_array[0]->device_name,
3567 port_array[0]->irq_level));
3568 } else {
3569 port_array[0]->irq_requested = true;
3570 adapter_test(port_array[0]);
3571 for (i=1 ; i < port_count ; i++) {
3572 port_array[i]->init_error = port_array[0]->init_error;
3573 port_array[i]->gpio_present = port_array[0]->gpio_present;
3574 }
3575 }
3576 }
3577
3578 for (i = 0; i < port_count; ++i) {
3579 struct slgt_info *info = port_array[i];
3580 tty_port_register_device(&info->port, serial_driver, info->line,
3581 &info->pdev->dev);
3582 }
3583}
3584
3585static int init_one(struct pci_dev *dev,
3586 const struct pci_device_id *ent)
3587{
3588 if (pci_enable_device(dev)) {
3589 printk("error enabling pci device %p\n", dev);
3590 return -EIO;
3591 }
3592 pci_set_master(dev);
3593 device_init(slgt_device_count, dev);
3594 return 0;
3595}
3596
3597static void remove_one(struct pci_dev *dev)
3598{
3599}
3600
3601static const struct tty_operations ops = {
3602 .open = open,
3603 .close = close,
3604 .write = write,
3605 .put_char = put_char,
3606 .flush_chars = flush_chars,
3607 .write_room = write_room,
3608 .chars_in_buffer = chars_in_buffer,
3609 .flush_buffer = flush_buffer,
3610 .ioctl = ioctl,
3611 .compat_ioctl = slgt_compat_ioctl,
3612 .throttle = throttle,
3613 .unthrottle = unthrottle,
3614 .send_xchar = send_xchar,
3615 .break_ctl = set_break,
3616 .wait_until_sent = wait_until_sent,
3617 .set_termios = set_termios,
3618 .stop = tx_hold,
3619 .start = tx_release,
3620 .hangup = hangup,
3621 .tiocmget = tiocmget,
3622 .tiocmset = tiocmset,
3623 .get_icount = get_icount,
3624 .proc_show = synclink_gt_proc_show,
3625};
3626
3627static void slgt_cleanup(void)
3628{
3629 struct slgt_info *info;
3630 struct slgt_info *tmp;
3631
3632 if (serial_driver) {
3633 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3634 tty_unregister_device(serial_driver, info->line);
3635 tty_unregister_driver(serial_driver);
3636 tty_driver_kref_put(serial_driver);
3637 }
3638
3639 /* reset devices */
3640 info = slgt_device_list;
3641 while(info) {
3642 reset_port(info);
3643 info = info->next_device;
3644 }
3645
3646 /* release devices */
3647 info = slgt_device_list;
3648 while(info) {
3649#if SYNCLINK_GENERIC_HDLC
3650 hdlcdev_exit(info);
3651#endif
3652 free_dma_bufs(info);
3653 free_tmp_rbuf(info);
3654 if (info->port_num == 0)
3655 release_resources(info);
3656 tmp = info;
3657 info = info->next_device;
3658 tty_port_destroy(&tmp->port);
3659 kfree(tmp);
3660 }
3661
3662 if (pci_registered)
3663 pci_unregister_driver(&pci_driver);
3664}
3665
3666/*
3667 * Driver initialization entry point.
3668 */
3669static int __init slgt_init(void)
3670{
3671 int rc;
3672
3673 serial_driver = tty_alloc_driver(MAX_DEVICES, TTY_DRIVER_REAL_RAW |
3674 TTY_DRIVER_DYNAMIC_DEV);
3675 if (IS_ERR(serial_driver)) {
3676 printk("%s can't allocate tty driver\n", driver_name);
3677 return PTR_ERR(serial_driver);
3678 }
3679
3680 /* Initialize the tty_driver structure */
3681
3682 serial_driver->driver_name = "synclink_gt";
3683 serial_driver->name = tty_dev_prefix;
3684 serial_driver->major = ttymajor;
3685 serial_driver->minor_start = 64;
3686 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3687 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3688 serial_driver->init_termios = tty_std_termios;
3689 serial_driver->init_termios.c_cflag =
3690 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3691 serial_driver->init_termios.c_ispeed = 9600;
3692 serial_driver->init_termios.c_ospeed = 9600;
3693 tty_set_operations(serial_driver, &ops);
3694 if ((rc = tty_register_driver(serial_driver)) < 0) {
3695 DBGERR(("%s can't register serial driver\n", driver_name));
3696 tty_driver_kref_put(serial_driver);
3697 serial_driver = NULL;
3698 goto error;
3699 }
3700
3701 slgt_device_count = 0;
3702 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3703 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3704 goto error;
3705 }
3706 pci_registered = true;
3707
3708 return 0;
3709
3710error:
3711 slgt_cleanup();
3712 return rc;
3713}
3714
3715static void __exit slgt_exit(void)
3716{
3717 slgt_cleanup();
3718}
3719
3720module_init(slgt_init);
3721module_exit(slgt_exit);
3722
3723/*
3724 * register access routines
3725 */
3726
3727static inline void __iomem *calc_regaddr(struct slgt_info *info,
3728 unsigned int addr)
3729{
3730 void __iomem *reg_addr = info->reg_addr + addr;
3731
3732 if (addr >= 0x80)
3733 reg_addr += info->port_num * 32;
3734 else if (addr >= 0x40)
3735 reg_addr += info->port_num * 16;
3736
3737 return reg_addr;
3738}
3739
3740static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3741{
3742 return readb(calc_regaddr(info, addr));
3743}
3744
3745static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3746{
3747 writeb(value, calc_regaddr(info, addr));
3748}
3749
3750static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3751{
3752 return readw(calc_regaddr(info, addr));
3753}
3754
3755static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3756{
3757 writew(value, calc_regaddr(info, addr));
3758}
3759
3760static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3761{
3762 return readl(calc_regaddr(info, addr));
3763}
3764
3765static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3766{
3767 writel(value, calc_regaddr(info, addr));
3768}
3769
3770static void rdma_reset(struct slgt_info *info)
3771{
3772 unsigned int i;
3773
3774 /* set reset bit */
3775 wr_reg32(info, RDCSR, BIT1);
3776
3777 /* wait for enable bit cleared */
3778 for(i=0 ; i < 1000 ; i++)
3779 if (!(rd_reg32(info, RDCSR) & BIT0))
3780 break;
3781}
3782
3783static void tdma_reset(struct slgt_info *info)
3784{
3785 unsigned int i;
3786
3787 /* set reset bit */
3788 wr_reg32(info, TDCSR, BIT1);
3789
3790 /* wait for enable bit cleared */
3791 for(i=0 ; i < 1000 ; i++)
3792 if (!(rd_reg32(info, TDCSR) & BIT0))
3793 break;
3794}
3795
3796/*
3797 * enable internal loopback
3798 * TxCLK and RxCLK are generated from BRG
3799 * and TxD is looped back to RxD internally.
3800 */
3801static void enable_loopback(struct slgt_info *info)
3802{
3803 /* SCR (serial control) BIT2=loopback enable */
3804 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3805
3806 if (info->params.mode != MGSL_MODE_ASYNC) {
3807 /* CCR (clock control)
3808 * 07..05 tx clock source (010 = BRG)
3809 * 04..02 rx clock source (010 = BRG)
3810 * 01 auxclk enable (0 = disable)
3811 * 00 BRG enable (1 = enable)
3812 *
3813 * 0100 1001
3814 */
3815 wr_reg8(info, CCR, 0x49);
3816
3817 /* set speed if available, otherwise use default */
3818 if (info->params.clock_speed)
3819 set_rate(info, info->params.clock_speed);
3820 else
3821 set_rate(info, 3686400);
3822 }
3823}
3824
3825/*
3826 * set baud rate generator to specified rate
3827 */
3828static void set_rate(struct slgt_info *info, u32 rate)
3829{
3830 unsigned int div;
3831 unsigned int osc = info->base_clock;
3832
3833 /* div = osc/rate - 1
3834 *
3835 * Round div up if osc/rate is not integer to
3836 * force to next slowest rate.
3837 */
3838
3839 if (rate) {
3840 div = osc/rate;
3841 if (!(osc % rate) && div)
3842 div--;
3843 wr_reg16(info, BDR, (unsigned short)div);
3844 }
3845}
3846
3847static void rx_stop(struct slgt_info *info)
3848{
3849 unsigned short val;
3850
3851 /* disable and reset receiver */
3852 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3853 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3854 wr_reg16(info, RCR, val); /* clear reset bit */
3855
3856 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3857
3858 /* clear pending rx interrupts */
3859 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3860
3861 rdma_reset(info);
3862
3863 info->rx_enabled = false;
3864 info->rx_restart = false;
3865}
3866
3867static void rx_start(struct slgt_info *info)
3868{
3869 unsigned short val;
3870
3871 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3872
3873 /* clear pending rx overrun IRQ */
3874 wr_reg16(info, SSR, IRQ_RXOVER);
3875
3876 /* reset and disable receiver */
3877 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3878 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3879 wr_reg16(info, RCR, val); /* clear reset bit */
3880
3881 rdma_reset(info);
3882 reset_rbufs(info);
3883
3884 if (info->rx_pio) {
3885 /* rx request when rx FIFO not empty */
3886 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
3887 slgt_irq_on(info, IRQ_RXDATA);
3888 if (info->params.mode == MGSL_MODE_ASYNC) {
3889 /* enable saving of rx status */
3890 wr_reg32(info, RDCSR, BIT6);
3891 }
3892 } else {
3893 /* rx request when rx FIFO half full */
3894 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
3895 /* set 1st descriptor address */
3896 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3897
3898 if (info->params.mode != MGSL_MODE_ASYNC) {
3899 /* enable rx DMA and DMA interrupt */
3900 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3901 } else {
3902 /* enable saving of rx status, rx DMA and DMA interrupt */
3903 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3904 }
3905 }
3906
3907 slgt_irq_on(info, IRQ_RXOVER);
3908
3909 /* enable receiver */
3910 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3911
3912 info->rx_restart = false;
3913 info->rx_enabled = true;
3914}
3915
3916static void tx_start(struct slgt_info *info)
3917{
3918 if (!info->tx_enabled) {
3919 wr_reg16(info, TCR,
3920 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
3921 info->tx_enabled = true;
3922 }
3923
3924 if (desc_count(info->tbufs[info->tbuf_start])) {
3925 info->drop_rts_on_tx_done = false;
3926
3927 if (info->params.mode != MGSL_MODE_ASYNC) {
3928 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3929 get_gtsignals(info);
3930 if (!(info->signals & SerialSignal_RTS)) {
3931 info->signals |= SerialSignal_RTS;
3932 set_gtsignals(info);
3933 info->drop_rts_on_tx_done = true;
3934 }
3935 }
3936
3937 slgt_irq_off(info, IRQ_TXDATA);
3938 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3939 /* clear tx idle and underrun status bits */
3940 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3941 } else {
3942 slgt_irq_off(info, IRQ_TXDATA);
3943 slgt_irq_on(info, IRQ_TXIDLE);
3944 /* clear tx idle status bit */
3945 wr_reg16(info, SSR, IRQ_TXIDLE);
3946 }
3947 /* set 1st descriptor address and start DMA */
3948 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3949 wr_reg32(info, TDCSR, BIT2 + BIT0);
3950 info->tx_active = true;
3951 }
3952}
3953
3954static void tx_stop(struct slgt_info *info)
3955{
3956 unsigned short val;
3957
3958 del_timer(&info->tx_timer);
3959
3960 tdma_reset(info);
3961
3962 /* reset and disable transmitter */
3963 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
3964 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3965
3966 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3967
3968 /* clear tx idle and underrun status bit */
3969 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3970
3971 reset_tbufs(info);
3972
3973 info->tx_enabled = false;
3974 info->tx_active = false;
3975}
3976
3977static void reset_port(struct slgt_info *info)
3978{
3979 if (!info->reg_addr)
3980 return;
3981
3982 tx_stop(info);
3983 rx_stop(info);
3984
3985 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3986 set_gtsignals(info);
3987
3988 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3989}
3990
3991static void reset_adapter(struct slgt_info *info)
3992{
3993 int i;
3994 for (i=0; i < info->port_count; ++i) {
3995 if (info->port_array[i])
3996 reset_port(info->port_array[i]);
3997 }
3998}
3999
4000static void async_mode(struct slgt_info *info)
4001{
4002 unsigned short val;
4003
4004 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4005 tx_stop(info);
4006 rx_stop(info);
4007
4008 /* TCR (tx control)
4009 *
4010 * 15..13 mode, 010=async
4011 * 12..10 encoding, 000=NRZ
4012 * 09 parity enable
4013 * 08 1=odd parity, 0=even parity
4014 * 07 1=RTS driver control
4015 * 06 1=break enable
4016 * 05..04 character length
4017 * 00=5 bits
4018 * 01=6 bits
4019 * 10=7 bits
4020 * 11=8 bits
4021 * 03 0=1 stop bit, 1=2 stop bits
4022 * 02 reset
4023 * 01 enable
4024 * 00 auto-CTS enable
4025 */
4026 val = 0x4000;
4027
4028 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4029 val |= BIT7;
4030
4031 if (info->params.parity != ASYNC_PARITY_NONE) {
4032 val |= BIT9;
4033 if (info->params.parity == ASYNC_PARITY_ODD)
4034 val |= BIT8;
4035 }
4036
4037 switch (info->params.data_bits)
4038 {
4039 case 6: val |= BIT4; break;
4040 case 7: val |= BIT5; break;
4041 case 8: val |= BIT5 + BIT4; break;
4042 }
4043
4044 if (info->params.stop_bits != 1)
4045 val |= BIT3;
4046
4047 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4048 val |= BIT0;
4049
4050 wr_reg16(info, TCR, val);
4051
4052 /* RCR (rx control)
4053 *
4054 * 15..13 mode, 010=async
4055 * 12..10 encoding, 000=NRZ
4056 * 09 parity enable
4057 * 08 1=odd parity, 0=even parity
4058 * 07..06 reserved, must be 0
4059 * 05..04 character length
4060 * 00=5 bits
4061 * 01=6 bits
4062 * 10=7 bits
4063 * 11=8 bits
4064 * 03 reserved, must be zero
4065 * 02 reset
4066 * 01 enable
4067 * 00 auto-DCD enable
4068 */
4069 val = 0x4000;
4070
4071 if (info->params.parity != ASYNC_PARITY_NONE) {
4072 val |= BIT9;
4073 if (info->params.parity == ASYNC_PARITY_ODD)
4074 val |= BIT8;
4075 }
4076
4077 switch (info->params.data_bits)
4078 {
4079 case 6: val |= BIT4; break;
4080 case 7: val |= BIT5; break;
4081 case 8: val |= BIT5 + BIT4; break;
4082 }
4083
4084 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4085 val |= BIT0;
4086
4087 wr_reg16(info, RCR, val);
4088
4089 /* CCR (clock control)
4090 *
4091 * 07..05 011 = tx clock source is BRG/16
4092 * 04..02 010 = rx clock source is BRG
4093 * 01 0 = auxclk disabled
4094 * 00 1 = BRG enabled
4095 *
4096 * 0110 1001
4097 */
4098 wr_reg8(info, CCR, 0x69);
4099
4100 msc_set_vcr(info);
4101
4102 /* SCR (serial control)
4103 *
4104 * 15 1=tx req on FIFO half empty
4105 * 14 1=rx req on FIFO half full
4106 * 13 tx data IRQ enable
4107 * 12 tx idle IRQ enable
4108 * 11 rx break on IRQ enable
4109 * 10 rx data IRQ enable
4110 * 09 rx break off IRQ enable
4111 * 08 overrun IRQ enable
4112 * 07 DSR IRQ enable
4113 * 06 CTS IRQ enable
4114 * 05 DCD IRQ enable
4115 * 04 RI IRQ enable
4116 * 03 0=16x sampling, 1=8x sampling
4117 * 02 1=txd->rxd internal loopback enable
4118 * 01 reserved, must be zero
4119 * 00 1=master IRQ enable
4120 */
4121 val = BIT15 + BIT14 + BIT0;
4122 /* JCR[8] : 1 = x8 async mode feature available */
4123 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4124 ((info->base_clock < (info->params.data_rate * 16)) ||
4125 (info->base_clock % (info->params.data_rate * 16)))) {
4126 /* use 8x sampling */
4127 val |= BIT3;
4128 set_rate(info, info->params.data_rate * 8);
4129 } else {
4130 /* use 16x sampling */
4131 set_rate(info, info->params.data_rate * 16);
4132 }
4133 wr_reg16(info, SCR, val);
4134
4135 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4136
4137 if (info->params.loopback)
4138 enable_loopback(info);
4139}
4140
4141static void sync_mode(struct slgt_info *info)
4142{
4143 unsigned short val;
4144
4145 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4146 tx_stop(info);
4147 rx_stop(info);
4148
4149 /* TCR (tx control)
4150 *
4151 * 15..13 mode
4152 * 000=HDLC/SDLC
4153 * 001=raw bit synchronous
4154 * 010=asynchronous/isochronous
4155 * 011=monosync byte synchronous
4156 * 100=bisync byte synchronous
4157 * 101=xsync byte synchronous
4158 * 12..10 encoding
4159 * 09 CRC enable
4160 * 08 CRC32
4161 * 07 1=RTS driver control
4162 * 06 preamble enable
4163 * 05..04 preamble length
4164 * 03 share open/close flag
4165 * 02 reset
4166 * 01 enable
4167 * 00 auto-CTS enable
4168 */
4169 val = BIT2;
4170
4171 switch(info->params.mode) {
4172 case MGSL_MODE_XSYNC:
4173 val |= BIT15 + BIT13;
4174 break;
4175 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4176 case MGSL_MODE_BISYNC: val |= BIT15; break;
4177 case MGSL_MODE_RAW: val |= BIT13; break;
4178 }
4179 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4180 val |= BIT7;
4181
4182 switch(info->params.encoding)
4183 {
4184 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4185 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4186 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4187 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4188 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4189 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4190 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4191 }
4192
4193 switch (info->params.crc_type & HDLC_CRC_MASK)
4194 {
4195 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4196 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4197 }
4198
4199 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4200 val |= BIT6;
4201
4202 switch (info->params.preamble_length)
4203 {
4204 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4205 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4206 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4207 }
4208
4209 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4210 val |= BIT0;
4211
4212 wr_reg16(info, TCR, val);
4213
4214 /* TPR (transmit preamble) */
4215
4216 switch (info->params.preamble)
4217 {
4218 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4219 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4220 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4221 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4222 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4223 default: val = 0x7e; break;
4224 }
4225 wr_reg8(info, TPR, (unsigned char)val);
4226
4227 /* RCR (rx control)
4228 *
4229 * 15..13 mode
4230 * 000=HDLC/SDLC
4231 * 001=raw bit synchronous
4232 * 010=asynchronous/isochronous
4233 * 011=monosync byte synchronous
4234 * 100=bisync byte synchronous
4235 * 101=xsync byte synchronous
4236 * 12..10 encoding
4237 * 09 CRC enable
4238 * 08 CRC32
4239 * 07..03 reserved, must be 0
4240 * 02 reset
4241 * 01 enable
4242 * 00 auto-DCD enable
4243 */
4244 val = 0;
4245
4246 switch(info->params.mode) {
4247 case MGSL_MODE_XSYNC:
4248 val |= BIT15 + BIT13;
4249 break;
4250 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4251 case MGSL_MODE_BISYNC: val |= BIT15; break;
4252 case MGSL_MODE_RAW: val |= BIT13; break;
4253 }
4254
4255 switch(info->params.encoding)
4256 {
4257 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4258 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4259 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4260 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4261 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4262 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4263 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4264 }
4265
4266 switch (info->params.crc_type & HDLC_CRC_MASK)
4267 {
4268 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4269 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4270 }
4271
4272 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4273 val |= BIT0;
4274
4275 wr_reg16(info, RCR, val);
4276
4277 /* CCR (clock control)
4278 *
4279 * 07..05 tx clock source
4280 * 04..02 rx clock source
4281 * 01 auxclk enable
4282 * 00 BRG enable
4283 */
4284 val = 0;
4285
4286 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4287 {
4288 // when RxC source is DPLL, BRG generates 16X DPLL
4289 // reference clock, so take TxC from BRG/16 to get
4290 // transmit clock at actual data rate
4291 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4292 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4293 else
4294 val |= BIT6; /* 010, txclk = BRG */
4295 }
4296 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4297 val |= BIT7; /* 100, txclk = DPLL Input */
4298 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4299 val |= BIT5; /* 001, txclk = RXC Input */
4300
4301 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4302 val |= BIT3; /* 010, rxclk = BRG */
4303 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4304 val |= BIT4; /* 100, rxclk = DPLL */
4305 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4306 val |= BIT2; /* 001, rxclk = TXC Input */
4307
4308 if (info->params.clock_speed)
4309 val |= BIT1 + BIT0;
4310
4311 wr_reg8(info, CCR, (unsigned char)val);
4312
4313 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4314 {
4315 // program DPLL mode
4316 switch(info->params.encoding)
4317 {
4318 case HDLC_ENCODING_BIPHASE_MARK:
4319 case HDLC_ENCODING_BIPHASE_SPACE:
4320 val = BIT7; break;
4321 case HDLC_ENCODING_BIPHASE_LEVEL:
4322 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4323 val = BIT7 + BIT6; break;
4324 default: val = BIT6; // NRZ encodings
4325 }
4326 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4327
4328 // DPLL requires a 16X reference clock from BRG
4329 set_rate(info, info->params.clock_speed * 16);
4330 }
4331 else
4332 set_rate(info, info->params.clock_speed);
4333
4334 tx_set_idle(info);
4335
4336 msc_set_vcr(info);
4337
4338 /* SCR (serial control)
4339 *
4340 * 15 1=tx req on FIFO half empty
4341 * 14 1=rx req on FIFO half full
4342 * 13 tx data IRQ enable
4343 * 12 tx idle IRQ enable
4344 * 11 underrun IRQ enable
4345 * 10 rx data IRQ enable
4346 * 09 rx idle IRQ enable
4347 * 08 overrun IRQ enable
4348 * 07 DSR IRQ enable
4349 * 06 CTS IRQ enable
4350 * 05 DCD IRQ enable
4351 * 04 RI IRQ enable
4352 * 03 reserved, must be zero
4353 * 02 1=txd->rxd internal loopback enable
4354 * 01 reserved, must be zero
4355 * 00 1=master IRQ enable
4356 */
4357 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4358
4359 if (info->params.loopback)
4360 enable_loopback(info);
4361}
4362
4363/*
4364 * set transmit idle mode
4365 */
4366static void tx_set_idle(struct slgt_info *info)
4367{
4368 unsigned char val;
4369 unsigned short tcr;
4370
4371 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4372 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4373 */
4374 tcr = rd_reg16(info, TCR);
4375 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4376 /* disable preamble, set idle size to 16 bits */
4377 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4378 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4379 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4380 } else if (!(tcr & BIT6)) {
4381 /* preamble is disabled, set idle size to 8 bits */
4382 tcr &= ~(BIT5 + BIT4);
4383 }
4384 wr_reg16(info, TCR, tcr);
4385
4386 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4387 /* LSB of custom tx idle specified in tx idle register */
4388 val = (unsigned char)(info->idle_mode & 0xff);
4389 } else {
4390 /* standard 8 bit idle patterns */
4391 switch(info->idle_mode)
4392 {
4393 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4394 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4395 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4396 case HDLC_TXIDLE_ZEROS:
4397 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4398 default: val = 0xff;
4399 }
4400 }
4401
4402 wr_reg8(info, TIR, val);
4403}
4404
4405/*
4406 * get state of V24 status (input) signals
4407 */
4408static void get_gtsignals(struct slgt_info *info)
4409{
4410 unsigned short status = rd_reg16(info, SSR);
4411
4412 /* clear all serial signals except RTS and DTR */
4413 info->signals &= SerialSignal_RTS | SerialSignal_DTR;
4414
4415 if (status & BIT3)
4416 info->signals |= SerialSignal_DSR;
4417 if (status & BIT2)
4418 info->signals |= SerialSignal_CTS;
4419 if (status & BIT1)
4420 info->signals |= SerialSignal_DCD;
4421 if (status & BIT0)
4422 info->signals |= SerialSignal_RI;
4423}
4424
4425/*
4426 * set V.24 Control Register based on current configuration
4427 */
4428static void msc_set_vcr(struct slgt_info *info)
4429{
4430 unsigned char val = 0;
4431
4432 /* VCR (V.24 control)
4433 *
4434 * 07..04 serial IF select
4435 * 03 DTR
4436 * 02 RTS
4437 * 01 LL
4438 * 00 RL
4439 */
4440
4441 switch(info->if_mode & MGSL_INTERFACE_MASK)
4442 {
4443 case MGSL_INTERFACE_RS232:
4444 val |= BIT5; /* 0010 */
4445 break;
4446 case MGSL_INTERFACE_V35:
4447 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4448 break;
4449 case MGSL_INTERFACE_RS422:
4450 val |= BIT6; /* 0100 */
4451 break;
4452 }
4453
4454 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4455 val |= BIT4;
4456 if (info->signals & SerialSignal_DTR)
4457 val |= BIT3;
4458 if (info->signals & SerialSignal_RTS)
4459 val |= BIT2;
4460 if (info->if_mode & MGSL_INTERFACE_LL)
4461 val |= BIT1;
4462 if (info->if_mode & MGSL_INTERFACE_RL)
4463 val |= BIT0;
4464 wr_reg8(info, VCR, val);
4465}
4466
4467/*
4468 * set state of V24 control (output) signals
4469 */
4470static void set_gtsignals(struct slgt_info *info)
4471{
4472 unsigned char val = rd_reg8(info, VCR);
4473 if (info->signals & SerialSignal_DTR)
4474 val |= BIT3;
4475 else
4476 val &= ~BIT3;
4477 if (info->signals & SerialSignal_RTS)
4478 val |= BIT2;
4479 else
4480 val &= ~BIT2;
4481 wr_reg8(info, VCR, val);
4482}
4483
4484/*
4485 * free range of receive DMA buffers (i to last)
4486 */
4487static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4488{
4489 int done = 0;
4490
4491 while(!done) {
4492 /* reset current buffer for reuse */
4493 info->rbufs[i].status = 0;
4494 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4495 if (i == last)
4496 done = 1;
4497 if (++i == info->rbuf_count)
4498 i = 0;
4499 }
4500 info->rbuf_current = i;
4501}
4502
4503/*
4504 * mark all receive DMA buffers as free
4505 */
4506static void reset_rbufs(struct slgt_info *info)
4507{
4508 free_rbufs(info, 0, info->rbuf_count - 1);
4509 info->rbuf_fill_index = 0;
4510 info->rbuf_fill_count = 0;
4511}
4512
4513/*
4514 * pass receive HDLC frame to upper layer
4515 *
4516 * return true if frame available, otherwise false
4517 */
4518static bool rx_get_frame(struct slgt_info *info)
4519{
4520 unsigned int start, end;
4521 unsigned short status;
4522 unsigned int framesize = 0;
4523 unsigned long flags;
4524 struct tty_struct *tty = info->port.tty;
4525 unsigned char addr_field = 0xff;
4526 unsigned int crc_size = 0;
4527
4528 switch (info->params.crc_type & HDLC_CRC_MASK) {
4529 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4530 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4531 }
4532
4533check_again:
4534
4535 framesize = 0;
4536 addr_field = 0xff;
4537 start = end = info->rbuf_current;
4538
4539 for (;;) {
4540 if (!desc_complete(info->rbufs[end]))
4541 goto cleanup;
4542
4543 if (framesize == 0 && info->params.addr_filter != 0xff)
4544 addr_field = info->rbufs[end].buf[0];
4545
4546 framesize += desc_count(info->rbufs[end]);
4547
4548 if (desc_eof(info->rbufs[end]))
4549 break;
4550
4551 if (++end == info->rbuf_count)
4552 end = 0;
4553
4554 if (end == info->rbuf_current) {
4555 if (info->rx_enabled){
4556 spin_lock_irqsave(&info->lock,flags);
4557 rx_start(info);
4558 spin_unlock_irqrestore(&info->lock,flags);
4559 }
4560 goto cleanup;
4561 }
4562 }
4563
4564 /* status
4565 *
4566 * 15 buffer complete
4567 * 14..06 reserved
4568 * 05..04 residue
4569 * 02 eof (end of frame)
4570 * 01 CRC error
4571 * 00 abort
4572 */
4573 status = desc_status(info->rbufs[end]);
4574
4575 /* ignore CRC bit if not using CRC (bit is undefined) */
4576 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4577 status &= ~BIT1;
4578
4579 if (framesize == 0 ||
4580 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4581 free_rbufs(info, start, end);
4582 goto check_again;
4583 }
4584
4585 if (framesize < (2 + crc_size) || status & BIT0) {
4586 info->icount.rxshort++;
4587 framesize = 0;
4588 } else if (status & BIT1) {
4589 info->icount.rxcrc++;
4590 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4591 framesize = 0;
4592 }
4593
4594#if SYNCLINK_GENERIC_HDLC
4595 if (framesize == 0) {
4596 info->netdev->stats.rx_errors++;
4597 info->netdev->stats.rx_frame_errors++;
4598 }
4599#endif
4600
4601 DBGBH(("%s rx frame status=%04X size=%d\n",
4602 info->device_name, status, framesize));
4603 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4604
4605 if (framesize) {
4606 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4607 framesize -= crc_size;
4608 crc_size = 0;
4609 }
4610
4611 if (framesize > info->max_frame_size + crc_size)
4612 info->icount.rxlong++;
4613 else {
4614 /* copy dma buffer(s) to contiguous temp buffer */
4615 int copy_count = framesize;
4616 int i = start;
4617 unsigned char *p = info->tmp_rbuf;
4618 info->tmp_rbuf_count = framesize;
4619
4620 info->icount.rxok++;
4621
4622 while(copy_count) {
4623 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4624 memcpy(p, info->rbufs[i].buf, partial_count);
4625 p += partial_count;
4626 copy_count -= partial_count;
4627 if (++i == info->rbuf_count)
4628 i = 0;
4629 }
4630
4631 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4632 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4633 framesize++;
4634 }
4635
4636#if SYNCLINK_GENERIC_HDLC
4637 if (info->netcount)
4638 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4639 else
4640#endif
4641 ldisc_receive_buf(tty, info->tmp_rbuf, NULL,
4642 framesize);
4643 }
4644 }
4645 free_rbufs(info, start, end);
4646 return true;
4647
4648cleanup:
4649 return false;
4650}
4651
4652/*
4653 * pass receive buffer (RAW synchronous mode) to tty layer
4654 * return true if buffer available, otherwise false
4655 */
4656static bool rx_get_buf(struct slgt_info *info)
4657{
4658 unsigned int i = info->rbuf_current;
4659 unsigned int count;
4660
4661 if (!desc_complete(info->rbufs[i]))
4662 return false;
4663 count = desc_count(info->rbufs[i]);
4664 switch(info->params.mode) {
4665 case MGSL_MODE_MONOSYNC:
4666 case MGSL_MODE_BISYNC:
4667 case MGSL_MODE_XSYNC:
4668 /* ignore residue in byte synchronous modes */
4669 if (desc_residue(info->rbufs[i]))
4670 count--;
4671 break;
4672 }
4673 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4674 DBGINFO(("rx_get_buf size=%d\n", count));
4675 if (count)
4676 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf, NULL,
4677 count);
4678 free_rbufs(info, i, i);
4679 return true;
4680}
4681
4682static void reset_tbufs(struct slgt_info *info)
4683{
4684 unsigned int i;
4685 info->tbuf_current = 0;
4686 for (i=0 ; i < info->tbuf_count ; i++) {
4687 info->tbufs[i].status = 0;
4688 info->tbufs[i].count = 0;
4689 }
4690}
4691
4692/*
4693 * return number of free transmit DMA buffers
4694 */
4695static unsigned int free_tbuf_count(struct slgt_info *info)
4696{
4697 unsigned int count = 0;
4698 unsigned int i = info->tbuf_current;
4699
4700 do
4701 {
4702 if (desc_count(info->tbufs[i]))
4703 break; /* buffer in use */
4704 ++count;
4705 if (++i == info->tbuf_count)
4706 i=0;
4707 } while (i != info->tbuf_current);
4708
4709 /* if tx DMA active, last zero count buffer is in use */
4710 if (count && (rd_reg32(info, TDCSR) & BIT0))
4711 --count;
4712
4713 return count;
4714}
4715
4716/*
4717 * return number of bytes in unsent transmit DMA buffers
4718 * and the serial controller tx FIFO
4719 */
4720static unsigned int tbuf_bytes(struct slgt_info *info)
4721{
4722 unsigned int total_count = 0;
4723 unsigned int i = info->tbuf_current;
4724 unsigned int reg_value;
4725 unsigned int count;
4726 unsigned int active_buf_count = 0;
4727
4728 /*
4729 * Add descriptor counts for all tx DMA buffers.
4730 * If count is zero (cleared by DMA controller after read),
4731 * the buffer is complete or is actively being read from.
4732 *
4733 * Record buf_count of last buffer with zero count starting
4734 * from current ring position. buf_count is mirror
4735 * copy of count and is not cleared by serial controller.
4736 * If DMA controller is active, that buffer is actively
4737 * being read so add to total.
4738 */
4739 do {
4740 count = desc_count(info->tbufs[i]);
4741 if (count)
4742 total_count += count;
4743 else if (!total_count)
4744 active_buf_count = info->tbufs[i].buf_count;
4745 if (++i == info->tbuf_count)
4746 i = 0;
4747 } while (i != info->tbuf_current);
4748
4749 /* read tx DMA status register */
4750 reg_value = rd_reg32(info, TDCSR);
4751
4752 /* if tx DMA active, last zero count buffer is in use */
4753 if (reg_value & BIT0)
4754 total_count += active_buf_count;
4755
4756 /* add tx FIFO count = reg_value[15..8] */
4757 total_count += (reg_value >> 8) & 0xff;
4758
4759 /* if transmitter active add one byte for shift register */
4760 if (info->tx_active)
4761 total_count++;
4762
4763 return total_count;
4764}
4765
4766/*
4767 * load data into transmit DMA buffer ring and start transmitter if needed
4768 * return true if data accepted, otherwise false (buffers full)
4769 */
4770static bool tx_load(struct slgt_info *info, const u8 *buf, unsigned int size)
4771{
4772 unsigned short count;
4773 unsigned int i;
4774 struct slgt_desc *d;
4775
4776 /* check required buffer space */
4777 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
4778 return false;
4779
4780 DBGDATA(info, buf, size, "tx");
4781
4782 /*
4783 * copy data to one or more DMA buffers in circular ring
4784 * tbuf_start = first buffer for this data
4785 * tbuf_current = next free buffer
4786 *
4787 * Copy all data before making data visible to DMA controller by
4788 * setting descriptor count of the first buffer.
4789 * This prevents an active DMA controller from reading the first DMA
4790 * buffers of a frame and stopping before the final buffers are filled.
4791 */
4792
4793 info->tbuf_start = i = info->tbuf_current;
4794
4795 while (size) {
4796 d = &info->tbufs[i];
4797
4798 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4799 memcpy(d->buf, buf, count);
4800
4801 size -= count;
4802 buf += count;
4803
4804 /*
4805 * set EOF bit for last buffer of HDLC frame or
4806 * for every buffer in raw mode
4807 */
4808 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4809 info->params.mode == MGSL_MODE_RAW)
4810 set_desc_eof(*d, 1);
4811 else
4812 set_desc_eof(*d, 0);
4813
4814 /* set descriptor count for all but first buffer */
4815 if (i != info->tbuf_start)
4816 set_desc_count(*d, count);
4817 d->buf_count = count;
4818
4819 if (++i == info->tbuf_count)
4820 i = 0;
4821 }
4822
4823 info->tbuf_current = i;
4824
4825 /* set first buffer count to make new data visible to DMA controller */
4826 d = &info->tbufs[info->tbuf_start];
4827 set_desc_count(*d, d->buf_count);
4828
4829 /* start transmitter if needed and update transmit timeout */
4830 if (!info->tx_active)
4831 tx_start(info);
4832 update_tx_timer(info);
4833
4834 return true;
4835}
4836
4837static int register_test(struct slgt_info *info)
4838{
4839 static unsigned short patterns[] =
4840 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4841 static unsigned int count = ARRAY_SIZE(patterns);
4842 unsigned int i;
4843 int rc = 0;
4844
4845 for (i=0 ; i < count ; i++) {
4846 wr_reg16(info, TIR, patterns[i]);
4847 wr_reg16(info, BDR, patterns[(i+1)%count]);
4848 if ((rd_reg16(info, TIR) != patterns[i]) ||
4849 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4850 rc = -ENODEV;
4851 break;
4852 }
4853 }
4854 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4855 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4856 return rc;
4857}
4858
4859static int irq_test(struct slgt_info *info)
4860{
4861 unsigned long timeout;
4862 unsigned long flags;
4863 struct tty_struct *oldtty = info->port.tty;
4864 u32 speed = info->params.data_rate;
4865
4866 info->params.data_rate = 921600;
4867 info->port.tty = NULL;
4868
4869 spin_lock_irqsave(&info->lock, flags);
4870 async_mode(info);
4871 slgt_irq_on(info, IRQ_TXIDLE);
4872
4873 /* enable transmitter */
4874 wr_reg16(info, TCR,
4875 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4876
4877 /* write one byte and wait for tx idle */
4878 wr_reg16(info, TDR, 0);
4879
4880 /* assume failure */
4881 info->init_error = DiagStatus_IrqFailure;
4882 info->irq_occurred = false;
4883
4884 spin_unlock_irqrestore(&info->lock, flags);
4885
4886 timeout=100;
4887 while(timeout-- && !info->irq_occurred)
4888 msleep_interruptible(10);
4889
4890 spin_lock_irqsave(&info->lock,flags);
4891 reset_port(info);
4892 spin_unlock_irqrestore(&info->lock,flags);
4893
4894 info->params.data_rate = speed;
4895 info->port.tty = oldtty;
4896
4897 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4898 return info->irq_occurred ? 0 : -ENODEV;
4899}
4900
4901static int loopback_test_rx(struct slgt_info *info)
4902{
4903 unsigned char *src, *dest;
4904 int count;
4905
4906 if (desc_complete(info->rbufs[0])) {
4907 count = desc_count(info->rbufs[0]);
4908 src = info->rbufs[0].buf;
4909 dest = info->tmp_rbuf;
4910
4911 for( ; count ; count-=2, src+=2) {
4912 /* src=data byte (src+1)=status byte */
4913 if (!(*(src+1) & (BIT9 + BIT8))) {
4914 *dest = *src;
4915 dest++;
4916 info->tmp_rbuf_count++;
4917 }
4918 }
4919 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4920 return 1;
4921 }
4922 return 0;
4923}
4924
4925static int loopback_test(struct slgt_info *info)
4926{
4927#define TESTFRAMESIZE 20
4928
4929 unsigned long timeout;
4930 u16 count;
4931 unsigned char buf[TESTFRAMESIZE];
4932 int rc = -ENODEV;
4933 unsigned long flags;
4934
4935 struct tty_struct *oldtty = info->port.tty;
4936 MGSL_PARAMS params;
4937
4938 memcpy(¶ms, &info->params, sizeof(params));
4939
4940 info->params.mode = MGSL_MODE_ASYNC;
4941 info->params.data_rate = 921600;
4942 info->params.loopback = 1;
4943 info->port.tty = NULL;
4944
4945 /* build and send transmit frame */
4946 for (count = 0; count < TESTFRAMESIZE; ++count)
4947 buf[count] = (unsigned char)count;
4948
4949 info->tmp_rbuf_count = 0;
4950 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4951
4952 /* program hardware for HDLC and enabled receiver */
4953 spin_lock_irqsave(&info->lock,flags);
4954 async_mode(info);
4955 rx_start(info);
4956 tx_load(info, buf, count);
4957 spin_unlock_irqrestore(&info->lock, flags);
4958
4959 /* wait for receive complete */
4960 for (timeout = 100; timeout; --timeout) {
4961 msleep_interruptible(10);
4962 if (loopback_test_rx(info)) {
4963 rc = 0;
4964 break;
4965 }
4966 }
4967
4968 /* verify received frame length and contents */
4969 if (!rc && (info->tmp_rbuf_count != count ||
4970 memcmp(buf, info->tmp_rbuf, count))) {
4971 rc = -ENODEV;
4972 }
4973
4974 spin_lock_irqsave(&info->lock,flags);
4975 reset_adapter(info);
4976 spin_unlock_irqrestore(&info->lock,flags);
4977
4978 memcpy(&info->params, ¶ms, sizeof(info->params));
4979 info->port.tty = oldtty;
4980
4981 info->init_error = rc ? DiagStatus_DmaFailure : 0;
4982 return rc;
4983}
4984
4985static int adapter_test(struct slgt_info *info)
4986{
4987 DBGINFO(("testing %s\n", info->device_name));
4988 if (register_test(info) < 0) {
4989 printk("register test failure %s addr=%08X\n",
4990 info->device_name, info->phys_reg_addr);
4991 } else if (irq_test(info) < 0) {
4992 printk("IRQ test failure %s IRQ=%d\n",
4993 info->device_name, info->irq_level);
4994 } else if (loopback_test(info) < 0) {
4995 printk("loopback test failure %s\n", info->device_name);
4996 }
4997 return info->init_error;
4998}
4999
5000/*
5001 * transmit timeout handler
5002 */
5003static void tx_timeout(struct timer_list *t)
5004{
5005 struct slgt_info *info = from_timer(info, t, tx_timer);
5006 unsigned long flags;
5007
5008 DBGINFO(("%s tx_timeout\n", info->device_name));
5009 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5010 info->icount.txtimeout++;
5011 }
5012 spin_lock_irqsave(&info->lock,flags);
5013 tx_stop(info);
5014 spin_unlock_irqrestore(&info->lock,flags);
5015
5016#if SYNCLINK_GENERIC_HDLC
5017 if (info->netcount)
5018 hdlcdev_tx_done(info);
5019 else
5020#endif
5021 bh_transmit(info);
5022}
5023
5024/*
5025 * receive buffer polling timer
5026 */
5027static void rx_timeout(struct timer_list *t)
5028{
5029 struct slgt_info *info = from_timer(info, t, rx_timer);
5030 unsigned long flags;
5031
5032 DBGINFO(("%s rx_timeout\n", info->device_name));
5033 spin_lock_irqsave(&info->lock, flags);
5034 info->pending_bh |= BH_RECEIVE;
5035 spin_unlock_irqrestore(&info->lock, flags);
5036 bh_handler(&info->task);
5037}
5038