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