1 /*
2 * linux/drivers/char/pcmcia/synclink_cs.c
3 *
4 * $Id: synclink_cs.c,v 4.34 2005/09/08 13:20:54 paulkf Exp $
5 *
6 * Device driver for Microgate SyncLink PC Card
7 * multiprotocol serial adapter.
8 *
9 * written by Paul Fulghum for Microgate Corporation
10 * paulkf@microgate.com
11 *
12 * Microgate and SyncLink are trademarks of Microgate Corporation
13 *
14 * This code is released under the GNU General Public License (GPL)
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
30 #if defined(__i386__)
31 # define BREAKPOINT() asm(" int $3");
32 #else
33 # define BREAKPOINT() { }
34 #endif
35
36 #define MAX_DEVICE_COUNT 4
37
38 #include <linux/module.h>
39 #include <linux/errno.h>
40 #include <linux/signal.h>
41 #include <linux/sched.h>
42 #include <linux/timer.h>
43 #include <linux/time.h>
44 #include <linux/interrupt.h>
45 #include <linux/tty.h>
46 #include <linux/tty_flip.h>
47 #include <linux/serial.h>
48 #include <linux/major.h>
49 #include <linux/string.h>
50 #include <linux/fcntl.h>
51 #include <linux/ptrace.h>
52 #include <linux/ioport.h>
53 #include <linux/mm.h>
54 #include <linux/seq_file.h>
55 #include <linux/slab.h>
56 #include <linux/netdevice.h>
57 #include <linux/vmalloc.h>
58 #include <linux/init.h>
59 #include <linux/delay.h>
60 #include <linux/ioctl.h>
61 #include <linux/synclink.h>
62
63 #include <asm/system.h>
64 #include <asm/io.h>
65 #include <asm/irq.h>
66 #include <asm/dma.h>
67 #include <linux/bitops.h>
68 #include <asm/types.h>
69 #include <linux/termios.h>
70 #include <linux/workqueue.h>
71 #include <linux/hdlc.h>
72
73 #include <pcmcia/cistpl.h>
74 #include <pcmcia/cisreg.h>
75 #include <pcmcia/ds.h>
76
77 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
78 #define SYNCLINK_GENERIC_HDLC 1
79 #else
80 #define SYNCLINK_GENERIC_HDLC 0
81 #endif
82
83 #define GET_USER(error,value,addr) error = get_user(value,addr)
84 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
85 #define PUT_USER(error,value,addr) error = put_user(value,addr)
86 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
87
88 #include <asm/uaccess.h>
89
90 static MGSL_PARAMS default_params = {
91 MGSL_MODE_HDLC, /* unsigned long mode */
92 0, /* unsigned char loopback; */
93 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
94 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
95 0, /* unsigned long clock_speed; */
96 0xff, /* unsigned char addr_filter; */
97 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
98 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
99 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
100 9600, /* unsigned long data_rate; */
101 8, /* unsigned char data_bits; */
102 1, /* unsigned char stop_bits; */
103 ASYNC_PARITY_NONE /* unsigned char parity; */
104 };
105
106 typedef struct
107 {
108 int count;
109 unsigned char status;
110 char data[1];
111 } RXBUF;
112
113 /* The queue of BH actions to be performed */
114
115 #define BH_RECEIVE 1
116 #define BH_TRANSMIT 2
117 #define BH_STATUS 4
118
119 #define IO_PIN_SHUTDOWN_LIMIT 100
120
121 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
122
123 struct _input_signal_events {
124 int ri_up;
125 int ri_down;
126 int dsr_up;
127 int dsr_down;
128 int dcd_up;
129 int dcd_down;
130 int cts_up;
131 int cts_down;
132 };
133
134
135 /*
136 * Device instance data structure
137 */
138
139 typedef struct _mgslpc_info {
140 struct tty_port port;
141 void *if_ptr; /* General purpose pointer (used by SPPP) */
142 int magic;
143 int line;
144
145 struct mgsl_icount icount;
146
147 int timeout;
148 int x_char; /* xon/xoff character */
149 unsigned char read_status_mask;
150 unsigned char ignore_status_mask;
151
152 unsigned char *tx_buf;
153 int tx_put;
154 int tx_get;
155 int tx_count;
156
157 /* circular list of fixed length rx buffers */
158
159 unsigned char *rx_buf; /* memory allocated for all rx buffers */
160 int rx_buf_total_size; /* size of memory allocated for rx buffers */
161 int rx_put; /* index of next empty rx buffer */
162 int rx_get; /* index of next full rx buffer */
163 int rx_buf_size; /* size in bytes of single rx buffer */
164 int rx_buf_count; /* total number of rx buffers */
165 int rx_frame_count; /* number of full rx buffers */
166
167 wait_queue_head_t status_event_wait_q;
168 wait_queue_head_t event_wait_q;
169 struct timer_list tx_timer; /* HDLC transmit timeout timer */
170 struct _mgslpc_info *next_device; /* device list link */
171
172 unsigned short imra_value;
173 unsigned short imrb_value;
174 unsigned char pim_value;
175
176 spinlock_t lock;
177 struct work_struct task; /* task structure for scheduling bh */
178
179 u32 max_frame_size;
180
181 u32 pending_bh;
182
183 bool bh_running;
184 bool bh_requested;
185
186 int dcd_chkcount; /* check counts to prevent */
187 int cts_chkcount; /* too many IRQs if a signal */
188 int dsr_chkcount; /* is floating */
189 int ri_chkcount;
190
191 bool rx_enabled;
192 bool rx_overflow;
193
194 bool tx_enabled;
195 bool tx_active;
196 bool tx_aborting;
197 u32 idle_mode;
198
199 int if_mode; /* serial interface selection (RS-232, v.35 etc) */
200
201 char device_name[25]; /* device instance name */
202
203 unsigned int io_base; /* base I/O address of adapter */
204 unsigned int irq_level;
205
206 MGSL_PARAMS params; /* communications parameters */
207
208 unsigned char serial_signals; /* current serial signal states */
209
210 bool irq_occurred; /* for diagnostics use */
211 char testing_irq;
212 unsigned int init_error; /* startup error (DIAGS) */
213
214 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
215 bool drop_rts_on_tx_done;
216
217 struct _input_signal_events input_signal_events;
218
219 /* PCMCIA support */
220 struct pcmcia_device *p_dev;
221 int stop;
222
223 /* SPPP/Cisco HDLC device parts */
224 int netcount;
225 spinlock_t netlock;
226
227 #if SYNCLINK_GENERIC_HDLC
228 struct net_device *netdev;
229 #endif
230
231 } MGSLPC_INFO;
232
233 #define MGSLPC_MAGIC 0x5402
234
235 /*
236 * The size of the serial xmit buffer is 1 page, or 4096 bytes
237 */
238 #define TXBUFSIZE 4096
239
240
241 #define CHA 0x00 /* channel A offset */
242 #define CHB 0x40 /* channel B offset */
243
244 /*
245 * FIXME: PPC has PVR defined in asm/reg.h. For now we just undef it.
246 */
247 #undef PVR
248
249 #define RXFIFO 0
250 #define TXFIFO 0
251 #define STAR 0x20
252 #define CMDR 0x20
253 #define RSTA 0x21
254 #define PRE 0x21
255 #define MODE 0x22
256 #define TIMR 0x23
257 #define XAD1 0x24
258 #define XAD2 0x25
259 #define RAH1 0x26
260 #define RAH2 0x27
261 #define DAFO 0x27
262 #define RAL1 0x28
263 #define RFC 0x28
264 #define RHCR 0x29
265 #define RAL2 0x29
266 #define RBCL 0x2a
267 #define XBCL 0x2a
268 #define RBCH 0x2b
269 #define XBCH 0x2b
270 #define CCR0 0x2c
271 #define CCR1 0x2d
272 #define CCR2 0x2e
273 #define CCR3 0x2f
274 #define VSTR 0x34
275 #define BGR 0x34
276 #define RLCR 0x35
277 #define AML 0x36
278 #define AMH 0x37
279 #define GIS 0x38
280 #define IVA 0x38
281 #define IPC 0x39
282 #define ISR 0x3a
283 #define IMR 0x3a
284 #define PVR 0x3c
285 #define PIS 0x3d
286 #define PIM 0x3d
287 #define PCR 0x3e
288 #define CCR4 0x3f
289
290 // IMR/ISR
291
292 #define IRQ_BREAK_ON BIT15 // rx break detected
293 #define IRQ_DATAOVERRUN BIT14 // receive data overflow
294 #define IRQ_ALLSENT BIT13 // all sent
295 #define IRQ_UNDERRUN BIT12 // transmit data underrun
296 #define IRQ_TIMER BIT11 // timer interrupt
297 #define IRQ_CTS BIT10 // CTS status change
298 #define IRQ_TXREPEAT BIT9 // tx message repeat
299 #define IRQ_TXFIFO BIT8 // transmit pool ready
300 #define IRQ_RXEOM BIT7 // receive message end
301 #define IRQ_EXITHUNT BIT6 // receive frame start
302 #define IRQ_RXTIME BIT6 // rx char timeout
303 #define IRQ_DCD BIT2 // carrier detect status change
304 #define IRQ_OVERRUN BIT1 // receive frame overflow
305 #define IRQ_RXFIFO BIT0 // receive pool full
306
307 // STAR
308
309 #define XFW BIT6 // transmit FIFO write enable
310 #define CEC BIT2 // command executing
311 #define CTS BIT1 // CTS state
312
313 #define PVR_DTR BIT0
314 #define PVR_DSR BIT1
315 #define PVR_RI BIT2
316 #define PVR_AUTOCTS BIT3
317 #define PVR_RS232 0x20 /* 0010b */
318 #define PVR_V35 0xe0 /* 1110b */
319 #define PVR_RS422 0x40 /* 0100b */
320
321 /* Register access functions */
322
323 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
324 #define read_reg(info, reg) inb((info)->io_base + (reg))
325
326 #define read_reg16(info, reg) inw((info)->io_base + (reg))
327 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
328
329 #define set_reg_bits(info, reg, mask) \
330 write_reg(info, (reg), \
331 (unsigned char) (read_reg(info, (reg)) | (mask)))
332 #define clear_reg_bits(info, reg, mask) \
333 write_reg(info, (reg), \
334 (unsigned char) (read_reg(info, (reg)) & ~(mask)))
335 /*
336 * interrupt enable/disable routines
337 */
irq_disable(MGSLPC_INFO * info,unsigned char channel,unsigned short mask)338 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
339 {
340 if (channel == CHA) {
341 info->imra_value |= mask;
342 write_reg16(info, CHA + IMR, info->imra_value);
343 } else {
344 info->imrb_value |= mask;
345 write_reg16(info, CHB + IMR, info->imrb_value);
346 }
347 }
irq_enable(MGSLPC_INFO * info,unsigned char channel,unsigned short mask)348 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
349 {
350 if (channel == CHA) {
351 info->imra_value &= ~mask;
352 write_reg16(info, CHA + IMR, info->imra_value);
353 } else {
354 info->imrb_value &= ~mask;
355 write_reg16(info, CHB + IMR, info->imrb_value);
356 }
357 }
358
359 #define port_irq_disable(info, mask) \
360 { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
361
362 #define port_irq_enable(info, mask) \
363 { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
364
365 static void rx_start(MGSLPC_INFO *info);
366 static void rx_stop(MGSLPC_INFO *info);
367
368 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
369 static void tx_stop(MGSLPC_INFO *info);
370 static void tx_set_idle(MGSLPC_INFO *info);
371
372 static void get_signals(MGSLPC_INFO *info);
373 static void set_signals(MGSLPC_INFO *info);
374
375 static void reset_device(MGSLPC_INFO *info);
376
377 static void hdlc_mode(MGSLPC_INFO *info);
378 static void async_mode(MGSLPC_INFO *info);
379
380 static void tx_timeout(unsigned long context);
381
382 static int carrier_raised(struct tty_port *port);
383 static void dtr_rts(struct tty_port *port, int onoff);
384
385 #if SYNCLINK_GENERIC_HDLC
386 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
387 static void hdlcdev_tx_done(MGSLPC_INFO *info);
388 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
389 static int hdlcdev_init(MGSLPC_INFO *info);
390 static void hdlcdev_exit(MGSLPC_INFO *info);
391 #endif
392
393 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
394
395 static bool register_test(MGSLPC_INFO *info);
396 static bool irq_test(MGSLPC_INFO *info);
397 static int adapter_test(MGSLPC_INFO *info);
398
399 static int claim_resources(MGSLPC_INFO *info);
400 static void release_resources(MGSLPC_INFO *info);
401 static void mgslpc_add_device(MGSLPC_INFO *info);
402 static void mgslpc_remove_device(MGSLPC_INFO *info);
403
404 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
405 static void rx_reset_buffers(MGSLPC_INFO *info);
406 static int rx_alloc_buffers(MGSLPC_INFO *info);
407 static void rx_free_buffers(MGSLPC_INFO *info);
408
409 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
410
411 /*
412 * Bottom half interrupt handlers
413 */
414 static void bh_handler(struct work_struct *work);
415 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
416 static void bh_status(MGSLPC_INFO *info);
417
418 /*
419 * ioctl handlers
420 */
421 static int tiocmget(struct tty_struct *tty);
422 static int tiocmset(struct tty_struct *tty,
423 unsigned int set, unsigned int clear);
424 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
425 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
426 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
427 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
428 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
429 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
430 static int tx_abort(MGSLPC_INFO *info);
431 static int set_rxenable(MGSLPC_INFO *info, int enable);
432 static int wait_events(MGSLPC_INFO *info, int __user *mask);
433
434 static MGSLPC_INFO *mgslpc_device_list = NULL;
435 static int mgslpc_device_count = 0;
436
437 /*
438 * Set this param to non-zero to load eax with the
439 * .text section address and breakpoint on module load.
440 * This is useful for use with gdb and add-symbol-file command.
441 */
442 static int break_on_load=0;
443
444 /*
445 * Driver major number, defaults to zero to get auto
446 * assigned major number. May be forced as module parameter.
447 */
448 static int ttymajor=0;
449
450 static int debug_level = 0;
451 static int maxframe[MAX_DEVICE_COUNT] = {0,};
452
453 module_param(break_on_load, bool, 0);
454 module_param(ttymajor, int, 0);
455 module_param(debug_level, int, 0);
456 module_param_array(maxframe, int, NULL, 0);
457
458 MODULE_LICENSE("GPL");
459
460 static char *driver_name = "SyncLink PC Card driver";
461 static char *driver_version = "$Revision: 4.34 $";
462
463 static struct tty_driver *serial_driver;
464
465 /* number of characters left in xmit buffer before we ask for more */
466 #define WAKEUP_CHARS 256
467
468 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
469 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
470
471 /* PCMCIA prototypes */
472
473 static int mgslpc_config(struct pcmcia_device *link);
474 static void mgslpc_release(u_long arg);
475 static void mgslpc_detach(struct pcmcia_device *p_dev);
476
477 /*
478 * 1st function defined in .text section. Calling this function in
479 * init_module() followed by a breakpoint allows a remote debugger
480 * (gdb) to get the .text address for the add-symbol-file command.
481 * This allows remote debugging of dynamically loadable modules.
482 */
mgslpc_get_text_ptr(void)483 static void* mgslpc_get_text_ptr(void)
484 {
485 return mgslpc_get_text_ptr;
486 }
487
488 /**
489 * line discipline callback wrappers
490 *
491 * The wrappers maintain line discipline references
492 * while calling into the line discipline.
493 *
494 * ldisc_receive_buf - pass receive data to line discipline
495 */
496
ldisc_receive_buf(struct tty_struct * tty,const __u8 * data,char * flags,int count)497 static void ldisc_receive_buf(struct tty_struct *tty,
498 const __u8 *data, char *flags, int count)
499 {
500 struct tty_ldisc *ld;
501 if (!tty)
502 return;
503 ld = tty_ldisc_ref(tty);
504 if (ld) {
505 if (ld->ops->receive_buf)
506 ld->ops->receive_buf(tty, data, flags, count);
507 tty_ldisc_deref(ld);
508 }
509 }
510
511 static const struct tty_port_operations mgslpc_port_ops = {
512 .carrier_raised = carrier_raised,
513 .dtr_rts = dtr_rts
514 };
515
mgslpc_probe(struct pcmcia_device * link)516 static int mgslpc_probe(struct pcmcia_device *link)
517 {
518 MGSLPC_INFO *info;
519 int ret;
520
521 if (debug_level >= DEBUG_LEVEL_INFO)
522 printk("mgslpc_attach\n");
523
524 info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
525 if (!info) {
526 printk("Error can't allocate device instance data\n");
527 return -ENOMEM;
528 }
529
530 info->magic = MGSLPC_MAGIC;
531 tty_port_init(&info->port);
532 info->port.ops = &mgslpc_port_ops;
533 INIT_WORK(&info->task, bh_handler);
534 info->max_frame_size = 4096;
535 info->port.close_delay = 5*HZ/10;
536 info->port.closing_wait = 30*HZ;
537 init_waitqueue_head(&info->status_event_wait_q);
538 init_waitqueue_head(&info->event_wait_q);
539 spin_lock_init(&info->lock);
540 spin_lock_init(&info->netlock);
541 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
542 info->idle_mode = HDLC_TXIDLE_FLAGS;
543 info->imra_value = 0xffff;
544 info->imrb_value = 0xffff;
545 info->pim_value = 0xff;
546
547 info->p_dev = link;
548 link->priv = info;
549
550 /* Initialize the struct pcmcia_device structure */
551
552 ret = mgslpc_config(link);
553 if (ret)
554 return ret;
555
556 mgslpc_add_device(info);
557
558 return 0;
559 }
560
561 /* Card has been inserted.
562 */
563
mgslpc_ioprobe(struct pcmcia_device * p_dev,void * priv_data)564 static int mgslpc_ioprobe(struct pcmcia_device *p_dev, void *priv_data)
565 {
566 return pcmcia_request_io(p_dev);
567 }
568
mgslpc_config(struct pcmcia_device * link)569 static int mgslpc_config(struct pcmcia_device *link)
570 {
571 MGSLPC_INFO *info = link->priv;
572 int ret;
573
574 if (debug_level >= DEBUG_LEVEL_INFO)
575 printk("mgslpc_config(0x%p)\n", link);
576
577 link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
578
579 ret = pcmcia_loop_config(link, mgslpc_ioprobe, NULL);
580 if (ret != 0)
581 goto failed;
582
583 link->config_index = 8;
584 link->config_regs = PRESENT_OPTION;
585
586 ret = pcmcia_request_irq(link, mgslpc_isr);
587 if (ret)
588 goto failed;
589 ret = pcmcia_enable_device(link);
590 if (ret)
591 goto failed;
592
593 info->io_base = link->resource[0]->start;
594 info->irq_level = link->irq;
595 return 0;
596
597 failed:
598 mgslpc_release((u_long)link);
599 return -ENODEV;
600 }
601
602 /* Card has been removed.
603 * Unregister device and release PCMCIA configuration.
604 * If device is open, postpone until it is closed.
605 */
mgslpc_release(u_long arg)606 static void mgslpc_release(u_long arg)
607 {
608 struct pcmcia_device *link = (struct pcmcia_device *)arg;
609
610 if (debug_level >= DEBUG_LEVEL_INFO)
611 printk("mgslpc_release(0x%p)\n", link);
612
613 pcmcia_disable_device(link);
614 }
615
mgslpc_detach(struct pcmcia_device * link)616 static void mgslpc_detach(struct pcmcia_device *link)
617 {
618 if (debug_level >= DEBUG_LEVEL_INFO)
619 printk("mgslpc_detach(0x%p)\n", link);
620
621 ((MGSLPC_INFO *)link->priv)->stop = 1;
622 mgslpc_release((u_long)link);
623
624 mgslpc_remove_device((MGSLPC_INFO *)link->priv);
625 }
626
mgslpc_suspend(struct pcmcia_device * link)627 static int mgslpc_suspend(struct pcmcia_device *link)
628 {
629 MGSLPC_INFO *info = link->priv;
630
631 info->stop = 1;
632
633 return 0;
634 }
635
mgslpc_resume(struct pcmcia_device * link)636 static int mgslpc_resume(struct pcmcia_device *link)
637 {
638 MGSLPC_INFO *info = link->priv;
639
640 info->stop = 0;
641
642 return 0;
643 }
644
645
mgslpc_paranoia_check(MGSLPC_INFO * info,char * name,const char * routine)646 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
647 char *name, const char *routine)
648 {
649 #ifdef MGSLPC_PARANOIA_CHECK
650 static const char *badmagic =
651 "Warning: bad magic number for mgsl struct (%s) in %s\n";
652 static const char *badinfo =
653 "Warning: null mgslpc_info for (%s) in %s\n";
654
655 if (!info) {
656 printk(badinfo, name, routine);
657 return true;
658 }
659 if (info->magic != MGSLPC_MAGIC) {
660 printk(badmagic, name, routine);
661 return true;
662 }
663 #else
664 if (!info)
665 return true;
666 #endif
667 return false;
668 }
669
670
671 #define CMD_RXFIFO BIT7 // release current rx FIFO
672 #define CMD_RXRESET BIT6 // receiver reset
673 #define CMD_RXFIFO_READ BIT5
674 #define CMD_START_TIMER BIT4
675 #define CMD_TXFIFO BIT3 // release current tx FIFO
676 #define CMD_TXEOM BIT1 // transmit end message
677 #define CMD_TXRESET BIT0 // transmit reset
678
wait_command_complete(MGSLPC_INFO * info,unsigned char channel)679 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
680 {
681 int i = 0;
682 /* wait for command completion */
683 while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
684 udelay(1);
685 if (i++ == 1000)
686 return false;
687 }
688 return true;
689 }
690
issue_command(MGSLPC_INFO * info,unsigned char channel,unsigned char cmd)691 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
692 {
693 wait_command_complete(info, channel);
694 write_reg(info, (unsigned char) (channel + CMDR), cmd);
695 }
696
tx_pause(struct tty_struct * tty)697 static void tx_pause(struct tty_struct *tty)
698 {
699 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
700 unsigned long flags;
701
702 if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
703 return;
704 if (debug_level >= DEBUG_LEVEL_INFO)
705 printk("tx_pause(%s)\n",info->device_name);
706
707 spin_lock_irqsave(&info->lock,flags);
708 if (info->tx_enabled)
709 tx_stop(info);
710 spin_unlock_irqrestore(&info->lock,flags);
711 }
712
tx_release(struct tty_struct * tty)713 static void tx_release(struct tty_struct *tty)
714 {
715 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
716 unsigned long flags;
717
718 if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
719 return;
720 if (debug_level >= DEBUG_LEVEL_INFO)
721 printk("tx_release(%s)\n",info->device_name);
722
723 spin_lock_irqsave(&info->lock,flags);
724 if (!info->tx_enabled)
725 tx_start(info, tty);
726 spin_unlock_irqrestore(&info->lock,flags);
727 }
728
729 /* Return next bottom half action to perform.
730 * or 0 if nothing to do.
731 */
bh_action(MGSLPC_INFO * info)732 static int bh_action(MGSLPC_INFO *info)
733 {
734 unsigned long flags;
735 int rc = 0;
736
737 spin_lock_irqsave(&info->lock,flags);
738
739 if (info->pending_bh & BH_RECEIVE) {
740 info->pending_bh &= ~BH_RECEIVE;
741 rc = BH_RECEIVE;
742 } else if (info->pending_bh & BH_TRANSMIT) {
743 info->pending_bh &= ~BH_TRANSMIT;
744 rc = BH_TRANSMIT;
745 } else if (info->pending_bh & BH_STATUS) {
746 info->pending_bh &= ~BH_STATUS;
747 rc = BH_STATUS;
748 }
749
750 if (!rc) {
751 /* Mark BH routine as complete */
752 info->bh_running = false;
753 info->bh_requested = false;
754 }
755
756 spin_unlock_irqrestore(&info->lock,flags);
757
758 return rc;
759 }
760
bh_handler(struct work_struct * work)761 static void bh_handler(struct work_struct *work)
762 {
763 MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
764 struct tty_struct *tty;
765 int action;
766
767 if (!info)
768 return;
769
770 if (debug_level >= DEBUG_LEVEL_BH)
771 printk( "%s(%d):bh_handler(%s) entry\n",
772 __FILE__,__LINE__,info->device_name);
773
774 info->bh_running = true;
775 tty = tty_port_tty_get(&info->port);
776
777 while((action = bh_action(info)) != 0) {
778
779 /* Process work item */
780 if ( debug_level >= DEBUG_LEVEL_BH )
781 printk( "%s(%d):bh_handler() work item action=%d\n",
782 __FILE__,__LINE__,action);
783
784 switch (action) {
785
786 case BH_RECEIVE:
787 while(rx_get_frame(info, tty));
788 break;
789 case BH_TRANSMIT:
790 bh_transmit(info, tty);
791 break;
792 case BH_STATUS:
793 bh_status(info);
794 break;
795 default:
796 /* unknown work item ID */
797 printk("Unknown work item ID=%08X!\n", action);
798 break;
799 }
800 }
801
802 tty_kref_put(tty);
803 if (debug_level >= DEBUG_LEVEL_BH)
804 printk( "%s(%d):bh_handler(%s) exit\n",
805 __FILE__,__LINE__,info->device_name);
806 }
807
bh_transmit(MGSLPC_INFO * info,struct tty_struct * tty)808 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
809 {
810 if (debug_level >= DEBUG_LEVEL_BH)
811 printk("bh_transmit() entry on %s\n", info->device_name);
812
813 if (tty)
814 tty_wakeup(tty);
815 }
816
bh_status(MGSLPC_INFO * info)817 static void bh_status(MGSLPC_INFO *info)
818 {
819 info->ri_chkcount = 0;
820 info->dsr_chkcount = 0;
821 info->dcd_chkcount = 0;
822 info->cts_chkcount = 0;
823 }
824
825 /* eom: non-zero = end of frame */
rx_ready_hdlc(MGSLPC_INFO * info,int eom)826 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
827 {
828 unsigned char data[2];
829 unsigned char fifo_count, read_count, i;
830 RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
831
832 if (debug_level >= DEBUG_LEVEL_ISR)
833 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
834
835 if (!info->rx_enabled)
836 return;
837
838 if (info->rx_frame_count >= info->rx_buf_count) {
839 /* no more free buffers */
840 issue_command(info, CHA, CMD_RXRESET);
841 info->pending_bh |= BH_RECEIVE;
842 info->rx_overflow = true;
843 info->icount.buf_overrun++;
844 return;
845 }
846
847 if (eom) {
848 /* end of frame, get FIFO count from RBCL register */
849 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
850 fifo_count = 32;
851 } else
852 fifo_count = 32;
853
854 do {
855 if (fifo_count == 1) {
856 read_count = 1;
857 data[0] = read_reg(info, CHA + RXFIFO);
858 } else {
859 read_count = 2;
860 *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
861 }
862 fifo_count -= read_count;
863 if (!fifo_count && eom)
864 buf->status = data[--read_count];
865
866 for (i = 0; i < read_count; i++) {
867 if (buf->count >= info->max_frame_size) {
868 /* frame too large, reset receiver and reset current buffer */
869 issue_command(info, CHA, CMD_RXRESET);
870 buf->count = 0;
871 return;
872 }
873 *(buf->data + buf->count) = data[i];
874 buf->count++;
875 }
876 } while (fifo_count);
877
878 if (eom) {
879 info->pending_bh |= BH_RECEIVE;
880 info->rx_frame_count++;
881 info->rx_put++;
882 if (info->rx_put >= info->rx_buf_count)
883 info->rx_put = 0;
884 }
885 issue_command(info, CHA, CMD_RXFIFO);
886 }
887
rx_ready_async(MGSLPC_INFO * info,int tcd,struct tty_struct * tty)888 static void rx_ready_async(MGSLPC_INFO *info, int tcd, struct tty_struct *tty)
889 {
890 unsigned char data, status, flag;
891 int fifo_count;
892 int work = 0;
893 struct mgsl_icount *icount = &info->icount;
894
895 if (tcd) {
896 /* early termination, get FIFO count from RBCL register */
897 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
898
899 /* Zero fifo count could mean 0 or 32 bytes available.
900 * If BIT5 of STAR is set then at least 1 byte is available.
901 */
902 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
903 fifo_count = 32;
904 } else
905 fifo_count = 32;
906
907 tty_buffer_request_room(tty, fifo_count);
908 /* Flush received async data to receive data buffer. */
909 while (fifo_count) {
910 data = read_reg(info, CHA + RXFIFO);
911 status = read_reg(info, CHA + RXFIFO);
912 fifo_count -= 2;
913
914 icount->rx++;
915 flag = TTY_NORMAL;
916
917 // if no frameing/crc error then save data
918 // BIT7:parity error
919 // BIT6:framing error
920
921 if (status & (BIT7 + BIT6)) {
922 if (status & BIT7)
923 icount->parity++;
924 else
925 icount->frame++;
926
927 /* discard char if tty control flags say so */
928 if (status & info->ignore_status_mask)
929 continue;
930
931 status &= info->read_status_mask;
932
933 if (status & BIT7)
934 flag = TTY_PARITY;
935 else if (status & BIT6)
936 flag = TTY_FRAME;
937 }
938 work += tty_insert_flip_char(tty, data, flag);
939 }
940 issue_command(info, CHA, CMD_RXFIFO);
941
942 if (debug_level >= DEBUG_LEVEL_ISR) {
943 printk("%s(%d):rx_ready_async",
944 __FILE__,__LINE__);
945 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
946 __FILE__,__LINE__,icount->rx,icount->brk,
947 icount->parity,icount->frame,icount->overrun);
948 }
949
950 if (work)
951 tty_flip_buffer_push(tty);
952 }
953
954
tx_done(MGSLPC_INFO * info,struct tty_struct * tty)955 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
956 {
957 if (!info->tx_active)
958 return;
959
960 info->tx_active = false;
961 info->tx_aborting = false;
962
963 if (info->params.mode == MGSL_MODE_ASYNC)
964 return;
965
966 info->tx_count = info->tx_put = info->tx_get = 0;
967 del_timer(&info->tx_timer);
968
969 if (info->drop_rts_on_tx_done) {
970 get_signals(info);
971 if (info->serial_signals & SerialSignal_RTS) {
972 info->serial_signals &= ~SerialSignal_RTS;
973 set_signals(info);
974 }
975 info->drop_rts_on_tx_done = false;
976 }
977
978 #if SYNCLINK_GENERIC_HDLC
979 if (info->netcount)
980 hdlcdev_tx_done(info);
981 else
982 #endif
983 {
984 if (tty->stopped || tty->hw_stopped) {
985 tx_stop(info);
986 return;
987 }
988 info->pending_bh |= BH_TRANSMIT;
989 }
990 }
991
tx_ready(MGSLPC_INFO * info,struct tty_struct * tty)992 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
993 {
994 unsigned char fifo_count = 32;
995 int c;
996
997 if (debug_level >= DEBUG_LEVEL_ISR)
998 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
999
1000 if (info->params.mode == MGSL_MODE_HDLC) {
1001 if (!info->tx_active)
1002 return;
1003 } else {
1004 if (tty->stopped || tty->hw_stopped) {
1005 tx_stop(info);
1006 return;
1007 }
1008 if (!info->tx_count)
1009 info->tx_active = false;
1010 }
1011
1012 if (!info->tx_count)
1013 return;
1014
1015 while (info->tx_count && fifo_count) {
1016 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1017
1018 if (c == 1) {
1019 write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1020 } else {
1021 write_reg16(info, CHA + TXFIFO,
1022 *((unsigned short*)(info->tx_buf + info->tx_get)));
1023 }
1024 info->tx_count -= c;
1025 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1026 fifo_count -= c;
1027 }
1028
1029 if (info->params.mode == MGSL_MODE_ASYNC) {
1030 if (info->tx_count < WAKEUP_CHARS)
1031 info->pending_bh |= BH_TRANSMIT;
1032 issue_command(info, CHA, CMD_TXFIFO);
1033 } else {
1034 if (info->tx_count)
1035 issue_command(info, CHA, CMD_TXFIFO);
1036 else
1037 issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1038 }
1039 }
1040
cts_change(MGSLPC_INFO * info,struct tty_struct * tty)1041 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1042 {
1043 get_signals(info);
1044 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1045 irq_disable(info, CHB, IRQ_CTS);
1046 info->icount.cts++;
1047 if (info->serial_signals & SerialSignal_CTS)
1048 info->input_signal_events.cts_up++;
1049 else
1050 info->input_signal_events.cts_down++;
1051 wake_up_interruptible(&info->status_event_wait_q);
1052 wake_up_interruptible(&info->event_wait_q);
1053
1054 if (info->port.flags & ASYNC_CTS_FLOW) {
1055 if (tty->hw_stopped) {
1056 if (info->serial_signals & SerialSignal_CTS) {
1057 if (debug_level >= DEBUG_LEVEL_ISR)
1058 printk("CTS tx start...");
1059 if (tty)
1060 tty->hw_stopped = 0;
1061 tx_start(info, tty);
1062 info->pending_bh |= BH_TRANSMIT;
1063 return;
1064 }
1065 } else {
1066 if (!(info->serial_signals & SerialSignal_CTS)) {
1067 if (debug_level >= DEBUG_LEVEL_ISR)
1068 printk("CTS tx stop...");
1069 if (tty)
1070 tty->hw_stopped = 1;
1071 tx_stop(info);
1072 }
1073 }
1074 }
1075 info->pending_bh |= BH_STATUS;
1076 }
1077
dcd_change(MGSLPC_INFO * info,struct tty_struct * tty)1078 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1079 {
1080 get_signals(info);
1081 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1082 irq_disable(info, CHB, IRQ_DCD);
1083 info->icount.dcd++;
1084 if (info->serial_signals & SerialSignal_DCD) {
1085 info->input_signal_events.dcd_up++;
1086 }
1087 else
1088 info->input_signal_events.dcd_down++;
1089 #if SYNCLINK_GENERIC_HDLC
1090 if (info->netcount) {
1091 if (info->serial_signals & SerialSignal_DCD)
1092 netif_carrier_on(info->netdev);
1093 else
1094 netif_carrier_off(info->netdev);
1095 }
1096 #endif
1097 wake_up_interruptible(&info->status_event_wait_q);
1098 wake_up_interruptible(&info->event_wait_q);
1099
1100 if (info->port.flags & ASYNC_CHECK_CD) {
1101 if (debug_level >= DEBUG_LEVEL_ISR)
1102 printk("%s CD now %s...", info->device_name,
1103 (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1104 if (info->serial_signals & SerialSignal_DCD)
1105 wake_up_interruptible(&info->port.open_wait);
1106 else {
1107 if (debug_level >= DEBUG_LEVEL_ISR)
1108 printk("doing serial hangup...");
1109 if (tty)
1110 tty_hangup(tty);
1111 }
1112 }
1113 info->pending_bh |= BH_STATUS;
1114 }
1115
dsr_change(MGSLPC_INFO * info)1116 static void dsr_change(MGSLPC_INFO *info)
1117 {
1118 get_signals(info);
1119 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1120 port_irq_disable(info, PVR_DSR);
1121 info->icount.dsr++;
1122 if (info->serial_signals & SerialSignal_DSR)
1123 info->input_signal_events.dsr_up++;
1124 else
1125 info->input_signal_events.dsr_down++;
1126 wake_up_interruptible(&info->status_event_wait_q);
1127 wake_up_interruptible(&info->event_wait_q);
1128 info->pending_bh |= BH_STATUS;
1129 }
1130
ri_change(MGSLPC_INFO * info)1131 static void ri_change(MGSLPC_INFO *info)
1132 {
1133 get_signals(info);
1134 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1135 port_irq_disable(info, PVR_RI);
1136 info->icount.rng++;
1137 if (info->serial_signals & SerialSignal_RI)
1138 info->input_signal_events.ri_up++;
1139 else
1140 info->input_signal_events.ri_down++;
1141 wake_up_interruptible(&info->status_event_wait_q);
1142 wake_up_interruptible(&info->event_wait_q);
1143 info->pending_bh |= BH_STATUS;
1144 }
1145
1146 /* Interrupt service routine entry point.
1147 *
1148 * Arguments:
1149 *
1150 * irq interrupt number that caused interrupt
1151 * dev_id device ID supplied during interrupt registration
1152 */
mgslpc_isr(int dummy,void * dev_id)1153 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1154 {
1155 MGSLPC_INFO *info = dev_id;
1156 struct tty_struct *tty;
1157 unsigned short isr;
1158 unsigned char gis, pis;
1159 int count=0;
1160
1161 if (debug_level >= DEBUG_LEVEL_ISR)
1162 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1163
1164 if (!(info->p_dev->_locked))
1165 return IRQ_HANDLED;
1166
1167 tty = tty_port_tty_get(&info->port);
1168
1169 spin_lock(&info->lock);
1170
1171 while ((gis = read_reg(info, CHA + GIS))) {
1172 if (debug_level >= DEBUG_LEVEL_ISR)
1173 printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1174
1175 if ((gis & 0x70) || count > 1000) {
1176 printk("synclink_cs:hardware failed or ejected\n");
1177 break;
1178 }
1179 count++;
1180
1181 if (gis & (BIT1 + BIT0)) {
1182 isr = read_reg16(info, CHB + ISR);
1183 if (isr & IRQ_DCD)
1184 dcd_change(info, tty);
1185 if (isr & IRQ_CTS)
1186 cts_change(info, tty);
1187 }
1188 if (gis & (BIT3 + BIT2))
1189 {
1190 isr = read_reg16(info, CHA + ISR);
1191 if (isr & IRQ_TIMER) {
1192 info->irq_occurred = true;
1193 irq_disable(info, CHA, IRQ_TIMER);
1194 }
1195
1196 /* receive IRQs */
1197 if (isr & IRQ_EXITHUNT) {
1198 info->icount.exithunt++;
1199 wake_up_interruptible(&info->event_wait_q);
1200 }
1201 if (isr & IRQ_BREAK_ON) {
1202 info->icount.brk++;
1203 if (info->port.flags & ASYNC_SAK)
1204 do_SAK(tty);
1205 }
1206 if (isr & IRQ_RXTIME) {
1207 issue_command(info, CHA, CMD_RXFIFO_READ);
1208 }
1209 if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1210 if (info->params.mode == MGSL_MODE_HDLC)
1211 rx_ready_hdlc(info, isr & IRQ_RXEOM);
1212 else
1213 rx_ready_async(info, isr & IRQ_RXEOM, tty);
1214 }
1215
1216 /* transmit IRQs */
1217 if (isr & IRQ_UNDERRUN) {
1218 if (info->tx_aborting)
1219 info->icount.txabort++;
1220 else
1221 info->icount.txunder++;
1222 tx_done(info, tty);
1223 }
1224 else if (isr & IRQ_ALLSENT) {
1225 info->icount.txok++;
1226 tx_done(info, tty);
1227 }
1228 else if (isr & IRQ_TXFIFO)
1229 tx_ready(info, tty);
1230 }
1231 if (gis & BIT7) {
1232 pis = read_reg(info, CHA + PIS);
1233 if (pis & BIT1)
1234 dsr_change(info);
1235 if (pis & BIT2)
1236 ri_change(info);
1237 }
1238 }
1239
1240 /* Request bottom half processing if there's something
1241 * for it to do and the bh is not already running
1242 */
1243
1244 if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1245 if ( debug_level >= DEBUG_LEVEL_ISR )
1246 printk("%s(%d):%s queueing bh task.\n",
1247 __FILE__,__LINE__,info->device_name);
1248 schedule_work(&info->task);
1249 info->bh_requested = true;
1250 }
1251
1252 spin_unlock(&info->lock);
1253 tty_kref_put(tty);
1254
1255 if (debug_level >= DEBUG_LEVEL_ISR)
1256 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1257 __FILE__, __LINE__, info->irq_level);
1258
1259 return IRQ_HANDLED;
1260 }
1261
1262 /* Initialize and start device.
1263 */
startup(MGSLPC_INFO * info,struct tty_struct * tty)1264 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1265 {
1266 int retval = 0;
1267
1268 if (debug_level >= DEBUG_LEVEL_INFO)
1269 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1270
1271 if (info->port.flags & ASYNC_INITIALIZED)
1272 return 0;
1273
1274 if (!info->tx_buf) {
1275 /* allocate a page of memory for a transmit buffer */
1276 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1277 if (!info->tx_buf) {
1278 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1279 __FILE__,__LINE__,info->device_name);
1280 return -ENOMEM;
1281 }
1282 }
1283
1284 info->pending_bh = 0;
1285
1286 memset(&info->icount, 0, sizeof(info->icount));
1287
1288 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1289
1290 /* Allocate and claim adapter resources */
1291 retval = claim_resources(info);
1292
1293 /* perform existence check and diagnostics */
1294 if ( !retval )
1295 retval = adapter_test(info);
1296
1297 if ( retval ) {
1298 if (capable(CAP_SYS_ADMIN) && tty)
1299 set_bit(TTY_IO_ERROR, &tty->flags);
1300 release_resources(info);
1301 return retval;
1302 }
1303
1304 /* program hardware for current parameters */
1305 mgslpc_change_params(info, tty);
1306
1307 if (tty)
1308 clear_bit(TTY_IO_ERROR, &tty->flags);
1309
1310 info->port.flags |= ASYNC_INITIALIZED;
1311
1312 return 0;
1313 }
1314
1315 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1316 */
shutdown(MGSLPC_INFO * info,struct tty_struct * tty)1317 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1318 {
1319 unsigned long flags;
1320
1321 if (!(info->port.flags & ASYNC_INITIALIZED))
1322 return;
1323
1324 if (debug_level >= DEBUG_LEVEL_INFO)
1325 printk("%s(%d):mgslpc_shutdown(%s)\n",
1326 __FILE__,__LINE__, info->device_name );
1327
1328 /* clear status wait queue because status changes */
1329 /* can't happen after shutting down the hardware */
1330 wake_up_interruptible(&info->status_event_wait_q);
1331 wake_up_interruptible(&info->event_wait_q);
1332
1333 del_timer_sync(&info->tx_timer);
1334
1335 if (info->tx_buf) {
1336 free_page((unsigned long) info->tx_buf);
1337 info->tx_buf = NULL;
1338 }
1339
1340 spin_lock_irqsave(&info->lock,flags);
1341
1342 rx_stop(info);
1343 tx_stop(info);
1344
1345 /* TODO:disable interrupts instead of reset to preserve signal states */
1346 reset_device(info);
1347
1348 if (!tty || tty->termios->c_cflag & HUPCL) {
1349 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1350 set_signals(info);
1351 }
1352
1353 spin_unlock_irqrestore(&info->lock,flags);
1354
1355 release_resources(info);
1356
1357 if (tty)
1358 set_bit(TTY_IO_ERROR, &tty->flags);
1359
1360 info->port.flags &= ~ASYNC_INITIALIZED;
1361 }
1362
mgslpc_program_hw(MGSLPC_INFO * info,struct tty_struct * tty)1363 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1364 {
1365 unsigned long flags;
1366
1367 spin_lock_irqsave(&info->lock,flags);
1368
1369 rx_stop(info);
1370 tx_stop(info);
1371 info->tx_count = info->tx_put = info->tx_get = 0;
1372
1373 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1374 hdlc_mode(info);
1375 else
1376 async_mode(info);
1377
1378 set_signals(info);
1379
1380 info->dcd_chkcount = 0;
1381 info->cts_chkcount = 0;
1382 info->ri_chkcount = 0;
1383 info->dsr_chkcount = 0;
1384
1385 irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1386 port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1387 get_signals(info);
1388
1389 if (info->netcount || (tty && (tty->termios->c_cflag & CREAD)))
1390 rx_start(info);
1391
1392 spin_unlock_irqrestore(&info->lock,flags);
1393 }
1394
1395 /* Reconfigure adapter based on new parameters
1396 */
mgslpc_change_params(MGSLPC_INFO * info,struct tty_struct * tty)1397 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1398 {
1399 unsigned cflag;
1400 int bits_per_char;
1401
1402 if (!tty || !tty->termios)
1403 return;
1404
1405 if (debug_level >= DEBUG_LEVEL_INFO)
1406 printk("%s(%d):mgslpc_change_params(%s)\n",
1407 __FILE__,__LINE__, info->device_name );
1408
1409 cflag = tty->termios->c_cflag;
1410
1411 /* if B0 rate (hangup) specified then negate DTR and RTS */
1412 /* otherwise assert DTR and RTS */
1413 if (cflag & CBAUD)
1414 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1415 else
1416 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1417
1418 /* byte size and parity */
1419
1420 switch (cflag & CSIZE) {
1421 case CS5: info->params.data_bits = 5; break;
1422 case CS6: info->params.data_bits = 6; break;
1423 case CS7: info->params.data_bits = 7; break;
1424 case CS8: info->params.data_bits = 8; break;
1425 default: info->params.data_bits = 7; break;
1426 }
1427
1428 if (cflag & CSTOPB)
1429 info->params.stop_bits = 2;
1430 else
1431 info->params.stop_bits = 1;
1432
1433 info->params.parity = ASYNC_PARITY_NONE;
1434 if (cflag & PARENB) {
1435 if (cflag & PARODD)
1436 info->params.parity = ASYNC_PARITY_ODD;
1437 else
1438 info->params.parity = ASYNC_PARITY_EVEN;
1439 #ifdef CMSPAR
1440 if (cflag & CMSPAR)
1441 info->params.parity = ASYNC_PARITY_SPACE;
1442 #endif
1443 }
1444
1445 /* calculate number of jiffies to transmit a full
1446 * FIFO (32 bytes) at specified data rate
1447 */
1448 bits_per_char = info->params.data_bits +
1449 info->params.stop_bits + 1;
1450
1451 /* if port data rate is set to 460800 or less then
1452 * allow tty settings to override, otherwise keep the
1453 * current data rate.
1454 */
1455 if (info->params.data_rate <= 460800) {
1456 info->params.data_rate = tty_get_baud_rate(tty);
1457 }
1458
1459 if ( info->params.data_rate ) {
1460 info->timeout = (32*HZ*bits_per_char) /
1461 info->params.data_rate;
1462 }
1463 info->timeout += HZ/50; /* Add .02 seconds of slop */
1464
1465 if (cflag & CRTSCTS)
1466 info->port.flags |= ASYNC_CTS_FLOW;
1467 else
1468 info->port.flags &= ~ASYNC_CTS_FLOW;
1469
1470 if (cflag & CLOCAL)
1471 info->port.flags &= ~ASYNC_CHECK_CD;
1472 else
1473 info->port.flags |= ASYNC_CHECK_CD;
1474
1475 /* process tty input control flags */
1476
1477 info->read_status_mask = 0;
1478 if (I_INPCK(tty))
1479 info->read_status_mask |= BIT7 | BIT6;
1480 if (I_IGNPAR(tty))
1481 info->ignore_status_mask |= BIT7 | BIT6;
1482
1483 mgslpc_program_hw(info, tty);
1484 }
1485
1486 /* Add a character to the transmit buffer
1487 */
mgslpc_put_char(struct tty_struct * tty,unsigned char ch)1488 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1489 {
1490 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1491 unsigned long flags;
1492
1493 if (debug_level >= DEBUG_LEVEL_INFO) {
1494 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1495 __FILE__,__LINE__,ch,info->device_name);
1496 }
1497
1498 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1499 return 0;
1500
1501 if (!info->tx_buf)
1502 return 0;
1503
1504 spin_lock_irqsave(&info->lock,flags);
1505
1506 if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1507 if (info->tx_count < TXBUFSIZE - 1) {
1508 info->tx_buf[info->tx_put++] = ch;
1509 info->tx_put &= TXBUFSIZE-1;
1510 info->tx_count++;
1511 }
1512 }
1513
1514 spin_unlock_irqrestore(&info->lock,flags);
1515 return 1;
1516 }
1517
1518 /* Enable transmitter so remaining characters in the
1519 * transmit buffer are sent.
1520 */
mgslpc_flush_chars(struct tty_struct * tty)1521 static void mgslpc_flush_chars(struct tty_struct *tty)
1522 {
1523 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1524 unsigned long flags;
1525
1526 if (debug_level >= DEBUG_LEVEL_INFO)
1527 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1528 __FILE__,__LINE__,info->device_name,info->tx_count);
1529
1530 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1531 return;
1532
1533 if (info->tx_count <= 0 || tty->stopped ||
1534 tty->hw_stopped || !info->tx_buf)
1535 return;
1536
1537 if (debug_level >= DEBUG_LEVEL_INFO)
1538 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1539 __FILE__,__LINE__,info->device_name);
1540
1541 spin_lock_irqsave(&info->lock,flags);
1542 if (!info->tx_active)
1543 tx_start(info, tty);
1544 spin_unlock_irqrestore(&info->lock,flags);
1545 }
1546
1547 /* Send a block of data
1548 *
1549 * Arguments:
1550 *
1551 * tty pointer to tty information structure
1552 * buf pointer to buffer containing send data
1553 * count size of send data in bytes
1554 *
1555 * Returns: number of characters written
1556 */
mgslpc_write(struct tty_struct * tty,const unsigned char * buf,int count)1557 static int mgslpc_write(struct tty_struct * tty,
1558 const unsigned char *buf, int count)
1559 {
1560 int c, ret = 0;
1561 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1562 unsigned long flags;
1563
1564 if (debug_level >= DEBUG_LEVEL_INFO)
1565 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1566 __FILE__,__LINE__,info->device_name,count);
1567
1568 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1569 !info->tx_buf)
1570 goto cleanup;
1571
1572 if (info->params.mode == MGSL_MODE_HDLC) {
1573 if (count > TXBUFSIZE) {
1574 ret = -EIO;
1575 goto cleanup;
1576 }
1577 if (info->tx_active)
1578 goto cleanup;
1579 else if (info->tx_count)
1580 goto start;
1581 }
1582
1583 for (;;) {
1584 c = min(count,
1585 min(TXBUFSIZE - info->tx_count - 1,
1586 TXBUFSIZE - info->tx_put));
1587 if (c <= 0)
1588 break;
1589
1590 memcpy(info->tx_buf + info->tx_put, buf, c);
1591
1592 spin_lock_irqsave(&info->lock,flags);
1593 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1594 info->tx_count += c;
1595 spin_unlock_irqrestore(&info->lock,flags);
1596
1597 buf += c;
1598 count -= c;
1599 ret += c;
1600 }
1601 start:
1602 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1603 spin_lock_irqsave(&info->lock,flags);
1604 if (!info->tx_active)
1605 tx_start(info, tty);
1606 spin_unlock_irqrestore(&info->lock,flags);
1607 }
1608 cleanup:
1609 if (debug_level >= DEBUG_LEVEL_INFO)
1610 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1611 __FILE__,__LINE__,info->device_name,ret);
1612 return ret;
1613 }
1614
1615 /* Return the count of free bytes in transmit buffer
1616 */
mgslpc_write_room(struct tty_struct * tty)1617 static int mgslpc_write_room(struct tty_struct *tty)
1618 {
1619 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1620 int ret;
1621
1622 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1623 return 0;
1624
1625 if (info->params.mode == MGSL_MODE_HDLC) {
1626 /* HDLC (frame oriented) mode */
1627 if (info->tx_active)
1628 return 0;
1629 else
1630 return HDLC_MAX_FRAME_SIZE;
1631 } else {
1632 ret = TXBUFSIZE - info->tx_count - 1;
1633 if (ret < 0)
1634 ret = 0;
1635 }
1636
1637 if (debug_level >= DEBUG_LEVEL_INFO)
1638 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1639 __FILE__,__LINE__, info->device_name, ret);
1640 return ret;
1641 }
1642
1643 /* Return the count of bytes in transmit buffer
1644 */
mgslpc_chars_in_buffer(struct tty_struct * tty)1645 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1646 {
1647 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1648 int rc;
1649
1650 if (debug_level >= DEBUG_LEVEL_INFO)
1651 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1652 __FILE__,__LINE__, info->device_name );
1653
1654 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1655 return 0;
1656
1657 if (info->params.mode == MGSL_MODE_HDLC)
1658 rc = info->tx_active ? info->max_frame_size : 0;
1659 else
1660 rc = info->tx_count;
1661
1662 if (debug_level >= DEBUG_LEVEL_INFO)
1663 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1664 __FILE__,__LINE__, info->device_name, rc);
1665
1666 return rc;
1667 }
1668
1669 /* Discard all data in the send buffer
1670 */
mgslpc_flush_buffer(struct tty_struct * tty)1671 static void mgslpc_flush_buffer(struct tty_struct *tty)
1672 {
1673 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1674 unsigned long flags;
1675
1676 if (debug_level >= DEBUG_LEVEL_INFO)
1677 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1678 __FILE__,__LINE__, info->device_name );
1679
1680 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1681 return;
1682
1683 spin_lock_irqsave(&info->lock,flags);
1684 info->tx_count = info->tx_put = info->tx_get = 0;
1685 del_timer(&info->tx_timer);
1686 spin_unlock_irqrestore(&info->lock,flags);
1687
1688 wake_up_interruptible(&tty->write_wait);
1689 tty_wakeup(tty);
1690 }
1691
1692 /* Send a high-priority XON/XOFF character
1693 */
mgslpc_send_xchar(struct tty_struct * tty,char ch)1694 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1695 {
1696 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1697 unsigned long flags;
1698
1699 if (debug_level >= DEBUG_LEVEL_INFO)
1700 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1701 __FILE__,__LINE__, info->device_name, ch );
1702
1703 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1704 return;
1705
1706 info->x_char = ch;
1707 if (ch) {
1708 spin_lock_irqsave(&info->lock,flags);
1709 if (!info->tx_enabled)
1710 tx_start(info, tty);
1711 spin_unlock_irqrestore(&info->lock,flags);
1712 }
1713 }
1714
1715 /* Signal remote device to throttle send data (our receive data)
1716 */
mgslpc_throttle(struct tty_struct * tty)1717 static void mgslpc_throttle(struct tty_struct * tty)
1718 {
1719 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1720 unsigned long flags;
1721
1722 if (debug_level >= DEBUG_LEVEL_INFO)
1723 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1724 __FILE__,__LINE__, info->device_name );
1725
1726 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1727 return;
1728
1729 if (I_IXOFF(tty))
1730 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1731
1732 if (tty->termios->c_cflag & CRTSCTS) {
1733 spin_lock_irqsave(&info->lock,flags);
1734 info->serial_signals &= ~SerialSignal_RTS;
1735 set_signals(info);
1736 spin_unlock_irqrestore(&info->lock,flags);
1737 }
1738 }
1739
1740 /* Signal remote device to stop throttling send data (our receive data)
1741 */
mgslpc_unthrottle(struct tty_struct * tty)1742 static void mgslpc_unthrottle(struct tty_struct * tty)
1743 {
1744 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1745 unsigned long flags;
1746
1747 if (debug_level >= DEBUG_LEVEL_INFO)
1748 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1749 __FILE__,__LINE__, info->device_name );
1750
1751 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1752 return;
1753
1754 if (I_IXOFF(tty)) {
1755 if (info->x_char)
1756 info->x_char = 0;
1757 else
1758 mgslpc_send_xchar(tty, START_CHAR(tty));
1759 }
1760
1761 if (tty->termios->c_cflag & CRTSCTS) {
1762 spin_lock_irqsave(&info->lock,flags);
1763 info->serial_signals |= SerialSignal_RTS;
1764 set_signals(info);
1765 spin_unlock_irqrestore(&info->lock,flags);
1766 }
1767 }
1768
1769 /* get the current serial statistics
1770 */
get_stats(MGSLPC_INFO * info,struct mgsl_icount __user * user_icount)1771 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1772 {
1773 int err;
1774 if (debug_level >= DEBUG_LEVEL_INFO)
1775 printk("get_params(%s)\n", info->device_name);
1776 if (!user_icount) {
1777 memset(&info->icount, 0, sizeof(info->icount));
1778 } else {
1779 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1780 if (err)
1781 return -EFAULT;
1782 }
1783 return 0;
1784 }
1785
1786 /* get the current serial parameters
1787 */
get_params(MGSLPC_INFO * info,MGSL_PARAMS __user * user_params)1788 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1789 {
1790 int err;
1791 if (debug_level >= DEBUG_LEVEL_INFO)
1792 printk("get_params(%s)\n", info->device_name);
1793 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1794 if (err)
1795 return -EFAULT;
1796 return 0;
1797 }
1798
1799 /* set the serial parameters
1800 *
1801 * Arguments:
1802 *
1803 * info pointer to device instance data
1804 * new_params user buffer containing new serial params
1805 *
1806 * Returns: 0 if success, otherwise error code
1807 */
set_params(MGSLPC_INFO * info,MGSL_PARAMS __user * new_params,struct tty_struct * tty)1808 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1809 {
1810 unsigned long flags;
1811 MGSL_PARAMS tmp_params;
1812 int err;
1813
1814 if (debug_level >= DEBUG_LEVEL_INFO)
1815 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1816 info->device_name );
1817 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1818 if (err) {
1819 if ( debug_level >= DEBUG_LEVEL_INFO )
1820 printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1821 __FILE__,__LINE__,info->device_name);
1822 return -EFAULT;
1823 }
1824
1825 spin_lock_irqsave(&info->lock,flags);
1826 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1827 spin_unlock_irqrestore(&info->lock,flags);
1828
1829 mgslpc_change_params(info, tty);
1830
1831 return 0;
1832 }
1833
get_txidle(MGSLPC_INFO * info,int __user * idle_mode)1834 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1835 {
1836 int err;
1837 if (debug_level >= DEBUG_LEVEL_INFO)
1838 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1839 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1840 if (err)
1841 return -EFAULT;
1842 return 0;
1843 }
1844
set_txidle(MGSLPC_INFO * info,int idle_mode)1845 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1846 {
1847 unsigned long flags;
1848 if (debug_level >= DEBUG_LEVEL_INFO)
1849 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1850 spin_lock_irqsave(&info->lock,flags);
1851 info->idle_mode = idle_mode;
1852 tx_set_idle(info);
1853 spin_unlock_irqrestore(&info->lock,flags);
1854 return 0;
1855 }
1856
get_interface(MGSLPC_INFO * info,int __user * if_mode)1857 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1858 {
1859 int err;
1860 if (debug_level >= DEBUG_LEVEL_INFO)
1861 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1862 COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1863 if (err)
1864 return -EFAULT;
1865 return 0;
1866 }
1867
set_interface(MGSLPC_INFO * info,int if_mode)1868 static int set_interface(MGSLPC_INFO * info, int if_mode)
1869 {
1870 unsigned long flags;
1871 unsigned char val;
1872 if (debug_level >= DEBUG_LEVEL_INFO)
1873 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1874 spin_lock_irqsave(&info->lock,flags);
1875 info->if_mode = if_mode;
1876
1877 val = read_reg(info, PVR) & 0x0f;
1878 switch (info->if_mode)
1879 {
1880 case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1881 case MGSL_INTERFACE_V35: val |= PVR_V35; break;
1882 case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1883 }
1884 write_reg(info, PVR, val);
1885
1886 spin_unlock_irqrestore(&info->lock,flags);
1887 return 0;
1888 }
1889
set_txenable(MGSLPC_INFO * info,int enable,struct tty_struct * tty)1890 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1891 {
1892 unsigned long flags;
1893
1894 if (debug_level >= DEBUG_LEVEL_INFO)
1895 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1896
1897 spin_lock_irqsave(&info->lock,flags);
1898 if (enable) {
1899 if (!info->tx_enabled)
1900 tx_start(info, tty);
1901 } else {
1902 if (info->tx_enabled)
1903 tx_stop(info);
1904 }
1905 spin_unlock_irqrestore(&info->lock,flags);
1906 return 0;
1907 }
1908
tx_abort(MGSLPC_INFO * info)1909 static int tx_abort(MGSLPC_INFO * info)
1910 {
1911 unsigned long flags;
1912
1913 if (debug_level >= DEBUG_LEVEL_INFO)
1914 printk("tx_abort(%s)\n", info->device_name);
1915
1916 spin_lock_irqsave(&info->lock,flags);
1917 if (info->tx_active && info->tx_count &&
1918 info->params.mode == MGSL_MODE_HDLC) {
1919 /* clear data count so FIFO is not filled on next IRQ.
1920 * This results in underrun and abort transmission.
1921 */
1922 info->tx_count = info->tx_put = info->tx_get = 0;
1923 info->tx_aborting = true;
1924 }
1925 spin_unlock_irqrestore(&info->lock,flags);
1926 return 0;
1927 }
1928
set_rxenable(MGSLPC_INFO * info,int enable)1929 static int set_rxenable(MGSLPC_INFO * info, int enable)
1930 {
1931 unsigned long flags;
1932
1933 if (debug_level >= DEBUG_LEVEL_INFO)
1934 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1935
1936 spin_lock_irqsave(&info->lock,flags);
1937 if (enable) {
1938 if (!info->rx_enabled)
1939 rx_start(info);
1940 } else {
1941 if (info->rx_enabled)
1942 rx_stop(info);
1943 }
1944 spin_unlock_irqrestore(&info->lock,flags);
1945 return 0;
1946 }
1947
1948 /* wait for specified event to occur
1949 *
1950 * Arguments: info pointer to device instance data
1951 * mask pointer to bitmask of events to wait for
1952 * Return Value: 0 if successful and bit mask updated with
1953 * of events triggerred,
1954 * otherwise error code
1955 */
wait_events(MGSLPC_INFO * info,int __user * mask_ptr)1956 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
1957 {
1958 unsigned long flags;
1959 int s;
1960 int rc=0;
1961 struct mgsl_icount cprev, cnow;
1962 int events;
1963 int mask;
1964 struct _input_signal_events oldsigs, newsigs;
1965 DECLARE_WAITQUEUE(wait, current);
1966
1967 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
1968 if (rc)
1969 return -EFAULT;
1970
1971 if (debug_level >= DEBUG_LEVEL_INFO)
1972 printk("wait_events(%s,%d)\n", info->device_name, mask);
1973
1974 spin_lock_irqsave(&info->lock,flags);
1975
1976 /* return immediately if state matches requested events */
1977 get_signals(info);
1978 s = info->serial_signals;
1979 events = mask &
1980 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
1981 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
1982 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
1983 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
1984 if (events) {
1985 spin_unlock_irqrestore(&info->lock,flags);
1986 goto exit;
1987 }
1988
1989 /* save current irq counts */
1990 cprev = info->icount;
1991 oldsigs = info->input_signal_events;
1992
1993 if ((info->params.mode == MGSL_MODE_HDLC) &&
1994 (mask & MgslEvent_ExitHuntMode))
1995 irq_enable(info, CHA, IRQ_EXITHUNT);
1996
1997 set_current_state(TASK_INTERRUPTIBLE);
1998 add_wait_queue(&info->event_wait_q, &wait);
1999
2000 spin_unlock_irqrestore(&info->lock,flags);
2001
2002
2003 for(;;) {
2004 schedule();
2005 if (signal_pending(current)) {
2006 rc = -ERESTARTSYS;
2007 break;
2008 }
2009
2010 /* get current irq counts */
2011 spin_lock_irqsave(&info->lock,flags);
2012 cnow = info->icount;
2013 newsigs = info->input_signal_events;
2014 set_current_state(TASK_INTERRUPTIBLE);
2015 spin_unlock_irqrestore(&info->lock,flags);
2016
2017 /* if no change, wait aborted for some reason */
2018 if (newsigs.dsr_up == oldsigs.dsr_up &&
2019 newsigs.dsr_down == oldsigs.dsr_down &&
2020 newsigs.dcd_up == oldsigs.dcd_up &&
2021 newsigs.dcd_down == oldsigs.dcd_down &&
2022 newsigs.cts_up == oldsigs.cts_up &&
2023 newsigs.cts_down == oldsigs.cts_down &&
2024 newsigs.ri_up == oldsigs.ri_up &&
2025 newsigs.ri_down == oldsigs.ri_down &&
2026 cnow.exithunt == cprev.exithunt &&
2027 cnow.rxidle == cprev.rxidle) {
2028 rc = -EIO;
2029 break;
2030 }
2031
2032 events = mask &
2033 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2034 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2035 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2036 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2037 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2038 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2039 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2040 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2041 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2042 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2043 if (events)
2044 break;
2045
2046 cprev = cnow;
2047 oldsigs = newsigs;
2048 }
2049
2050 remove_wait_queue(&info->event_wait_q, &wait);
2051 set_current_state(TASK_RUNNING);
2052
2053 if (mask & MgslEvent_ExitHuntMode) {
2054 spin_lock_irqsave(&info->lock,flags);
2055 if (!waitqueue_active(&info->event_wait_q))
2056 irq_disable(info, CHA, IRQ_EXITHUNT);
2057 spin_unlock_irqrestore(&info->lock,flags);
2058 }
2059 exit:
2060 if (rc == 0)
2061 PUT_USER(rc, events, mask_ptr);
2062 return rc;
2063 }
2064
modem_input_wait(MGSLPC_INFO * info,int arg)2065 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2066 {
2067 unsigned long flags;
2068 int rc;
2069 struct mgsl_icount cprev, cnow;
2070 DECLARE_WAITQUEUE(wait, current);
2071
2072 /* save current irq counts */
2073 spin_lock_irqsave(&info->lock,flags);
2074 cprev = info->icount;
2075 add_wait_queue(&info->status_event_wait_q, &wait);
2076 set_current_state(TASK_INTERRUPTIBLE);
2077 spin_unlock_irqrestore(&info->lock,flags);
2078
2079 for(;;) {
2080 schedule();
2081 if (signal_pending(current)) {
2082 rc = -ERESTARTSYS;
2083 break;
2084 }
2085
2086 /* get new irq counts */
2087 spin_lock_irqsave(&info->lock,flags);
2088 cnow = info->icount;
2089 set_current_state(TASK_INTERRUPTIBLE);
2090 spin_unlock_irqrestore(&info->lock,flags);
2091
2092 /* if no change, wait aborted for some reason */
2093 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2094 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2095 rc = -EIO;
2096 break;
2097 }
2098
2099 /* check for change in caller specified modem input */
2100 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2101 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2102 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2103 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2104 rc = 0;
2105 break;
2106 }
2107
2108 cprev = cnow;
2109 }
2110 remove_wait_queue(&info->status_event_wait_q, &wait);
2111 set_current_state(TASK_RUNNING);
2112 return rc;
2113 }
2114
2115 /* return the state of the serial control and status signals
2116 */
tiocmget(struct tty_struct * tty)2117 static int tiocmget(struct tty_struct *tty)
2118 {
2119 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2120 unsigned int result;
2121 unsigned long flags;
2122
2123 spin_lock_irqsave(&info->lock,flags);
2124 get_signals(info);
2125 spin_unlock_irqrestore(&info->lock,flags);
2126
2127 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2128 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2129 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2130 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2131 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2132 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2133
2134 if (debug_level >= DEBUG_LEVEL_INFO)
2135 printk("%s(%d):%s tiocmget() value=%08X\n",
2136 __FILE__,__LINE__, info->device_name, result );
2137 return result;
2138 }
2139
2140 /* set modem control signals (DTR/RTS)
2141 */
tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)2142 static int tiocmset(struct tty_struct *tty,
2143 unsigned int set, unsigned int clear)
2144 {
2145 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2146 unsigned long flags;
2147
2148 if (debug_level >= DEBUG_LEVEL_INFO)
2149 printk("%s(%d):%s tiocmset(%x,%x)\n",
2150 __FILE__,__LINE__,info->device_name, set, clear);
2151
2152 if (set & TIOCM_RTS)
2153 info->serial_signals |= SerialSignal_RTS;
2154 if (set & TIOCM_DTR)
2155 info->serial_signals |= SerialSignal_DTR;
2156 if (clear & TIOCM_RTS)
2157 info->serial_signals &= ~SerialSignal_RTS;
2158 if (clear & TIOCM_DTR)
2159 info->serial_signals &= ~SerialSignal_DTR;
2160
2161 spin_lock_irqsave(&info->lock,flags);
2162 set_signals(info);
2163 spin_unlock_irqrestore(&info->lock,flags);
2164
2165 return 0;
2166 }
2167
2168 /* Set or clear transmit break condition
2169 *
2170 * Arguments: tty pointer to tty instance data
2171 * break_state -1=set break condition, 0=clear
2172 */
mgslpc_break(struct tty_struct * tty,int break_state)2173 static int mgslpc_break(struct tty_struct *tty, int break_state)
2174 {
2175 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2176 unsigned long flags;
2177
2178 if (debug_level >= DEBUG_LEVEL_INFO)
2179 printk("%s(%d):mgslpc_break(%s,%d)\n",
2180 __FILE__,__LINE__, info->device_name, break_state);
2181
2182 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2183 return -EINVAL;
2184
2185 spin_lock_irqsave(&info->lock,flags);
2186 if (break_state == -1)
2187 set_reg_bits(info, CHA+DAFO, BIT6);
2188 else
2189 clear_reg_bits(info, CHA+DAFO, BIT6);
2190 spin_unlock_irqrestore(&info->lock,flags);
2191 return 0;
2192 }
2193
mgslpc_get_icount(struct tty_struct * tty,struct serial_icounter_struct * icount)2194 static int mgslpc_get_icount(struct tty_struct *tty,
2195 struct serial_icounter_struct *icount)
2196 {
2197 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2198 struct mgsl_icount cnow; /* kernel counter temps */
2199 unsigned long flags;
2200
2201 spin_lock_irqsave(&info->lock,flags);
2202 cnow = info->icount;
2203 spin_unlock_irqrestore(&info->lock,flags);
2204
2205 icount->cts = cnow.cts;
2206 icount->dsr = cnow.dsr;
2207 icount->rng = cnow.rng;
2208 icount->dcd = cnow.dcd;
2209 icount->rx = cnow.rx;
2210 icount->tx = cnow.tx;
2211 icount->frame = cnow.frame;
2212 icount->overrun = cnow.overrun;
2213 icount->parity = cnow.parity;
2214 icount->brk = cnow.brk;
2215 icount->buf_overrun = cnow.buf_overrun;
2216
2217 return 0;
2218 }
2219
2220 /* Service an IOCTL request
2221 *
2222 * Arguments:
2223 *
2224 * tty pointer to tty instance data
2225 * cmd IOCTL command code
2226 * arg command argument/context
2227 *
2228 * Return Value: 0 if success, otherwise error code
2229 */
mgslpc_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)2230 static int mgslpc_ioctl(struct tty_struct *tty,
2231 unsigned int cmd, unsigned long arg)
2232 {
2233 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2234 void __user *argp = (void __user *)arg;
2235
2236 if (debug_level >= DEBUG_LEVEL_INFO)
2237 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2238 info->device_name, cmd );
2239
2240 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2241 return -ENODEV;
2242
2243 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2244 (cmd != TIOCMIWAIT)) {
2245 if (tty->flags & (1 << TTY_IO_ERROR))
2246 return -EIO;
2247 }
2248
2249 switch (cmd) {
2250 case MGSL_IOCGPARAMS:
2251 return get_params(info, argp);
2252 case MGSL_IOCSPARAMS:
2253 return set_params(info, argp, tty);
2254 case MGSL_IOCGTXIDLE:
2255 return get_txidle(info, argp);
2256 case MGSL_IOCSTXIDLE:
2257 return set_txidle(info, (int)arg);
2258 case MGSL_IOCGIF:
2259 return get_interface(info, argp);
2260 case MGSL_IOCSIF:
2261 return set_interface(info,(int)arg);
2262 case MGSL_IOCTXENABLE:
2263 return set_txenable(info,(int)arg, tty);
2264 case MGSL_IOCRXENABLE:
2265 return set_rxenable(info,(int)arg);
2266 case MGSL_IOCTXABORT:
2267 return tx_abort(info);
2268 case MGSL_IOCGSTATS:
2269 return get_stats(info, argp);
2270 case MGSL_IOCWAITEVENT:
2271 return wait_events(info, argp);
2272 case TIOCMIWAIT:
2273 return modem_input_wait(info,(int)arg);
2274 default:
2275 return -ENOIOCTLCMD;
2276 }
2277 return 0;
2278 }
2279
2280 /* Set new termios settings
2281 *
2282 * Arguments:
2283 *
2284 * tty pointer to tty structure
2285 * termios pointer to buffer to hold returned old termios
2286 */
mgslpc_set_termios(struct tty_struct * tty,struct ktermios * old_termios)2287 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2288 {
2289 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2290 unsigned long flags;
2291
2292 if (debug_level >= DEBUG_LEVEL_INFO)
2293 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2294 tty->driver->name );
2295
2296 /* just return if nothing has changed */
2297 if ((tty->termios->c_cflag == old_termios->c_cflag)
2298 && (RELEVANT_IFLAG(tty->termios->c_iflag)
2299 == RELEVANT_IFLAG(old_termios->c_iflag)))
2300 return;
2301
2302 mgslpc_change_params(info, tty);
2303
2304 /* Handle transition to B0 status */
2305 if (old_termios->c_cflag & CBAUD &&
2306 !(tty->termios->c_cflag & CBAUD)) {
2307 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2308 spin_lock_irqsave(&info->lock,flags);
2309 set_signals(info);
2310 spin_unlock_irqrestore(&info->lock,flags);
2311 }
2312
2313 /* Handle transition away from B0 status */
2314 if (!(old_termios->c_cflag & CBAUD) &&
2315 tty->termios->c_cflag & CBAUD) {
2316 info->serial_signals |= SerialSignal_DTR;
2317 if (!(tty->termios->c_cflag & CRTSCTS) ||
2318 !test_bit(TTY_THROTTLED, &tty->flags)) {
2319 info->serial_signals |= SerialSignal_RTS;
2320 }
2321 spin_lock_irqsave(&info->lock,flags);
2322 set_signals(info);
2323 spin_unlock_irqrestore(&info->lock,flags);
2324 }
2325
2326 /* Handle turning off CRTSCTS */
2327 if (old_termios->c_cflag & CRTSCTS &&
2328 !(tty->termios->c_cflag & CRTSCTS)) {
2329 tty->hw_stopped = 0;
2330 tx_release(tty);
2331 }
2332 }
2333
mgslpc_close(struct tty_struct * tty,struct file * filp)2334 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2335 {
2336 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2337 struct tty_port *port = &info->port;
2338
2339 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2340 return;
2341
2342 if (debug_level >= DEBUG_LEVEL_INFO)
2343 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2344 __FILE__,__LINE__, info->device_name, port->count);
2345
2346 WARN_ON(!port->count);
2347
2348 if (tty_port_close_start(port, tty, filp) == 0)
2349 goto cleanup;
2350
2351 if (port->flags & ASYNC_INITIALIZED)
2352 mgslpc_wait_until_sent(tty, info->timeout);
2353
2354 mgslpc_flush_buffer(tty);
2355
2356 tty_ldisc_flush(tty);
2357 shutdown(info, tty);
2358
2359 tty_port_close_end(port, tty);
2360 tty_port_tty_set(port, NULL);
2361 cleanup:
2362 if (debug_level >= DEBUG_LEVEL_INFO)
2363 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2364 tty->driver->name, port->count);
2365 }
2366
2367 /* Wait until the transmitter is empty.
2368 */
mgslpc_wait_until_sent(struct tty_struct * tty,int timeout)2369 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2370 {
2371 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2372 unsigned long orig_jiffies, char_time;
2373
2374 if (!info )
2375 return;
2376
2377 if (debug_level >= DEBUG_LEVEL_INFO)
2378 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2379 __FILE__,__LINE__, info->device_name );
2380
2381 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2382 return;
2383
2384 if (!(info->port.flags & ASYNC_INITIALIZED))
2385 goto exit;
2386
2387 orig_jiffies = jiffies;
2388
2389 /* Set check interval to 1/5 of estimated time to
2390 * send a character, and make it at least 1. The check
2391 * interval should also be less than the timeout.
2392 * Note: use tight timings here to satisfy the NIST-PCTS.
2393 */
2394
2395 if ( info->params.data_rate ) {
2396 char_time = info->timeout/(32 * 5);
2397 if (!char_time)
2398 char_time++;
2399 } else
2400 char_time = 1;
2401
2402 if (timeout)
2403 char_time = min_t(unsigned long, char_time, timeout);
2404
2405 if (info->params.mode == MGSL_MODE_HDLC) {
2406 while (info->tx_active) {
2407 msleep_interruptible(jiffies_to_msecs(char_time));
2408 if (signal_pending(current))
2409 break;
2410 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2411 break;
2412 }
2413 } else {
2414 while ((info->tx_count || info->tx_active) &&
2415 info->tx_enabled) {
2416 msleep_interruptible(jiffies_to_msecs(char_time));
2417 if (signal_pending(current))
2418 break;
2419 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2420 break;
2421 }
2422 }
2423
2424 exit:
2425 if (debug_level >= DEBUG_LEVEL_INFO)
2426 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2427 __FILE__,__LINE__, info->device_name );
2428 }
2429
2430 /* Called by tty_hangup() when a hangup is signaled.
2431 * This is the same as closing all open files for the port.
2432 */
mgslpc_hangup(struct tty_struct * tty)2433 static void mgslpc_hangup(struct tty_struct *tty)
2434 {
2435 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2436
2437 if (debug_level >= DEBUG_LEVEL_INFO)
2438 printk("%s(%d):mgslpc_hangup(%s)\n",
2439 __FILE__,__LINE__, info->device_name );
2440
2441 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2442 return;
2443
2444 mgslpc_flush_buffer(tty);
2445 shutdown(info, tty);
2446 tty_port_hangup(&info->port);
2447 }
2448
carrier_raised(struct tty_port * port)2449 static int carrier_raised(struct tty_port *port)
2450 {
2451 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2452 unsigned long flags;
2453
2454 spin_lock_irqsave(&info->lock,flags);
2455 get_signals(info);
2456 spin_unlock_irqrestore(&info->lock,flags);
2457
2458 if (info->serial_signals & SerialSignal_DCD)
2459 return 1;
2460 return 0;
2461 }
2462
dtr_rts(struct tty_port * port,int onoff)2463 static void dtr_rts(struct tty_port *port, int onoff)
2464 {
2465 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2466 unsigned long flags;
2467
2468 spin_lock_irqsave(&info->lock,flags);
2469 if (onoff)
2470 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2471 else
2472 info->serial_signals &= ~SerialSignal_RTS + SerialSignal_DTR;
2473 set_signals(info);
2474 spin_unlock_irqrestore(&info->lock,flags);
2475 }
2476
2477
mgslpc_open(struct tty_struct * tty,struct file * filp)2478 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2479 {
2480 MGSLPC_INFO *info;
2481 struct tty_port *port;
2482 int retval, line;
2483 unsigned long flags;
2484
2485 /* verify range of specified line number */
2486 line = tty->index;
2487 if ((line < 0) || (line >= mgslpc_device_count)) {
2488 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2489 __FILE__,__LINE__,line);
2490 return -ENODEV;
2491 }
2492
2493 /* find the info structure for the specified line */
2494 info = mgslpc_device_list;
2495 while(info && info->line != line)
2496 info = info->next_device;
2497 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2498 return -ENODEV;
2499
2500 port = &info->port;
2501 tty->driver_data = info;
2502 tty_port_tty_set(port, tty);
2503
2504 if (debug_level >= DEBUG_LEVEL_INFO)
2505 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2506 __FILE__,__LINE__,tty->driver->name, port->count);
2507
2508 /* If port is closing, signal caller to try again */
2509 if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
2510 if (port->flags & ASYNC_CLOSING)
2511 interruptible_sleep_on(&port->close_wait);
2512 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2513 -EAGAIN : -ERESTARTSYS);
2514 goto cleanup;
2515 }
2516
2517 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2518
2519 spin_lock_irqsave(&info->netlock, flags);
2520 if (info->netcount) {
2521 retval = -EBUSY;
2522 spin_unlock_irqrestore(&info->netlock, flags);
2523 goto cleanup;
2524 }
2525 spin_lock(&port->lock);
2526 port->count++;
2527 spin_unlock(&port->lock);
2528 spin_unlock_irqrestore(&info->netlock, flags);
2529
2530 if (port->count == 1) {
2531 /* 1st open on this device, init hardware */
2532 retval = startup(info, tty);
2533 if (retval < 0)
2534 goto cleanup;
2535 }
2536
2537 retval = tty_port_block_til_ready(&info->port, tty, filp);
2538 if (retval) {
2539 if (debug_level >= DEBUG_LEVEL_INFO)
2540 printk("%s(%d):block_til_ready(%s) returned %d\n",
2541 __FILE__,__LINE__, info->device_name, retval);
2542 goto cleanup;
2543 }
2544
2545 if (debug_level >= DEBUG_LEVEL_INFO)
2546 printk("%s(%d):mgslpc_open(%s) success\n",
2547 __FILE__,__LINE__, info->device_name);
2548 retval = 0;
2549
2550 cleanup:
2551 return retval;
2552 }
2553
2554 /*
2555 * /proc fs routines....
2556 */
2557
line_info(struct seq_file * m,MGSLPC_INFO * info)2558 static inline void line_info(struct seq_file *m, MGSLPC_INFO *info)
2559 {
2560 char stat_buf[30];
2561 unsigned long flags;
2562
2563 seq_printf(m, "%s:io:%04X irq:%d",
2564 info->device_name, info->io_base, info->irq_level);
2565
2566 /* output current serial signal states */
2567 spin_lock_irqsave(&info->lock,flags);
2568 get_signals(info);
2569 spin_unlock_irqrestore(&info->lock,flags);
2570
2571 stat_buf[0] = 0;
2572 stat_buf[1] = 0;
2573 if (info->serial_signals & SerialSignal_RTS)
2574 strcat(stat_buf, "|RTS");
2575 if (info->serial_signals & SerialSignal_CTS)
2576 strcat(stat_buf, "|CTS");
2577 if (info->serial_signals & SerialSignal_DTR)
2578 strcat(stat_buf, "|DTR");
2579 if (info->serial_signals & SerialSignal_DSR)
2580 strcat(stat_buf, "|DSR");
2581 if (info->serial_signals & SerialSignal_DCD)
2582 strcat(stat_buf, "|CD");
2583 if (info->serial_signals & SerialSignal_RI)
2584 strcat(stat_buf, "|RI");
2585
2586 if (info->params.mode == MGSL_MODE_HDLC) {
2587 seq_printf(m, " HDLC txok:%d rxok:%d",
2588 info->icount.txok, info->icount.rxok);
2589 if (info->icount.txunder)
2590 seq_printf(m, " txunder:%d", info->icount.txunder);
2591 if (info->icount.txabort)
2592 seq_printf(m, " txabort:%d", info->icount.txabort);
2593 if (info->icount.rxshort)
2594 seq_printf(m, " rxshort:%d", info->icount.rxshort);
2595 if (info->icount.rxlong)
2596 seq_printf(m, " rxlong:%d", info->icount.rxlong);
2597 if (info->icount.rxover)
2598 seq_printf(m, " rxover:%d", info->icount.rxover);
2599 if (info->icount.rxcrc)
2600 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
2601 } else {
2602 seq_printf(m, " ASYNC tx:%d rx:%d",
2603 info->icount.tx, info->icount.rx);
2604 if (info->icount.frame)
2605 seq_printf(m, " fe:%d", info->icount.frame);
2606 if (info->icount.parity)
2607 seq_printf(m, " pe:%d", info->icount.parity);
2608 if (info->icount.brk)
2609 seq_printf(m, " brk:%d", info->icount.brk);
2610 if (info->icount.overrun)
2611 seq_printf(m, " oe:%d", info->icount.overrun);
2612 }
2613
2614 /* Append serial signal status to end */
2615 seq_printf(m, " %s\n", stat_buf+1);
2616
2617 seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2618 info->tx_active,info->bh_requested,info->bh_running,
2619 info->pending_bh);
2620 }
2621
2622 /* Called to print information about devices
2623 */
mgslpc_proc_show(struct seq_file * m,void * v)2624 static int mgslpc_proc_show(struct seq_file *m, void *v)
2625 {
2626 MGSLPC_INFO *info;
2627
2628 seq_printf(m, "synclink driver:%s\n", driver_version);
2629
2630 info = mgslpc_device_list;
2631 while( info ) {
2632 line_info(m, info);
2633 info = info->next_device;
2634 }
2635 return 0;
2636 }
2637
mgslpc_proc_open(struct inode * inode,struct file * file)2638 static int mgslpc_proc_open(struct inode *inode, struct file *file)
2639 {
2640 return single_open(file, mgslpc_proc_show, NULL);
2641 }
2642
2643 static const struct file_operations mgslpc_proc_fops = {
2644 .owner = THIS_MODULE,
2645 .open = mgslpc_proc_open,
2646 .read = seq_read,
2647 .llseek = seq_lseek,
2648 .release = single_release,
2649 };
2650
rx_alloc_buffers(MGSLPC_INFO * info)2651 static int rx_alloc_buffers(MGSLPC_INFO *info)
2652 {
2653 /* each buffer has header and data */
2654 info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2655
2656 /* calculate total allocation size for 8 buffers */
2657 info->rx_buf_total_size = info->rx_buf_size * 8;
2658
2659 /* limit total allocated memory */
2660 if (info->rx_buf_total_size > 0x10000)
2661 info->rx_buf_total_size = 0x10000;
2662
2663 /* calculate number of buffers */
2664 info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2665
2666 info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2667 if (info->rx_buf == NULL)
2668 return -ENOMEM;
2669
2670 rx_reset_buffers(info);
2671 return 0;
2672 }
2673
rx_free_buffers(MGSLPC_INFO * info)2674 static void rx_free_buffers(MGSLPC_INFO *info)
2675 {
2676 kfree(info->rx_buf);
2677 info->rx_buf = NULL;
2678 }
2679
claim_resources(MGSLPC_INFO * info)2680 static int claim_resources(MGSLPC_INFO *info)
2681 {
2682 if (rx_alloc_buffers(info) < 0 ) {
2683 printk( "Can't allocate rx buffer %s\n", info->device_name);
2684 release_resources(info);
2685 return -ENODEV;
2686 }
2687 return 0;
2688 }
2689
release_resources(MGSLPC_INFO * info)2690 static void release_resources(MGSLPC_INFO *info)
2691 {
2692 if (debug_level >= DEBUG_LEVEL_INFO)
2693 printk("release_resources(%s)\n", info->device_name);
2694 rx_free_buffers(info);
2695 }
2696
2697 /* Add the specified device instance data structure to the
2698 * global linked list of devices and increment the device count.
2699 *
2700 * Arguments: info pointer to device instance data
2701 */
mgslpc_add_device(MGSLPC_INFO * info)2702 static void mgslpc_add_device(MGSLPC_INFO *info)
2703 {
2704 info->next_device = NULL;
2705 info->line = mgslpc_device_count;
2706 sprintf(info->device_name,"ttySLP%d",info->line);
2707
2708 if (info->line < MAX_DEVICE_COUNT) {
2709 if (maxframe[info->line])
2710 info->max_frame_size = maxframe[info->line];
2711 }
2712
2713 mgslpc_device_count++;
2714
2715 if (!mgslpc_device_list)
2716 mgslpc_device_list = info;
2717 else {
2718 MGSLPC_INFO *current_dev = mgslpc_device_list;
2719 while( current_dev->next_device )
2720 current_dev = current_dev->next_device;
2721 current_dev->next_device = info;
2722 }
2723
2724 if (info->max_frame_size < 4096)
2725 info->max_frame_size = 4096;
2726 else if (info->max_frame_size > 65535)
2727 info->max_frame_size = 65535;
2728
2729 printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2730 info->device_name, info->io_base, info->irq_level);
2731
2732 #if SYNCLINK_GENERIC_HDLC
2733 hdlcdev_init(info);
2734 #endif
2735 }
2736
mgslpc_remove_device(MGSLPC_INFO * remove_info)2737 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2738 {
2739 MGSLPC_INFO *info = mgslpc_device_list;
2740 MGSLPC_INFO *last = NULL;
2741
2742 while(info) {
2743 if (info == remove_info) {
2744 if (last)
2745 last->next_device = info->next_device;
2746 else
2747 mgslpc_device_list = info->next_device;
2748 #if SYNCLINK_GENERIC_HDLC
2749 hdlcdev_exit(info);
2750 #endif
2751 release_resources(info);
2752 kfree(info);
2753 mgslpc_device_count--;
2754 return;
2755 }
2756 last = info;
2757 info = info->next_device;
2758 }
2759 }
2760
2761 static struct pcmcia_device_id mgslpc_ids[] = {
2762 PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2763 PCMCIA_DEVICE_NULL
2764 };
2765 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2766
2767 static struct pcmcia_driver mgslpc_driver = {
2768 .owner = THIS_MODULE,
2769 .name = "synclink_cs",
2770 .probe = mgslpc_probe,
2771 .remove = mgslpc_detach,
2772 .id_table = mgslpc_ids,
2773 .suspend = mgslpc_suspend,
2774 .resume = mgslpc_resume,
2775 };
2776
2777 static const struct tty_operations mgslpc_ops = {
2778 .open = mgslpc_open,
2779 .close = mgslpc_close,
2780 .write = mgslpc_write,
2781 .put_char = mgslpc_put_char,
2782 .flush_chars = mgslpc_flush_chars,
2783 .write_room = mgslpc_write_room,
2784 .chars_in_buffer = mgslpc_chars_in_buffer,
2785 .flush_buffer = mgslpc_flush_buffer,
2786 .ioctl = mgslpc_ioctl,
2787 .throttle = mgslpc_throttle,
2788 .unthrottle = mgslpc_unthrottle,
2789 .send_xchar = mgslpc_send_xchar,
2790 .break_ctl = mgslpc_break,
2791 .wait_until_sent = mgslpc_wait_until_sent,
2792 .set_termios = mgslpc_set_termios,
2793 .stop = tx_pause,
2794 .start = tx_release,
2795 .hangup = mgslpc_hangup,
2796 .tiocmget = tiocmget,
2797 .tiocmset = tiocmset,
2798 .get_icount = mgslpc_get_icount,
2799 .proc_fops = &mgslpc_proc_fops,
2800 };
2801
synclink_cs_cleanup(void)2802 static void synclink_cs_cleanup(void)
2803 {
2804 int rc;
2805
2806 while(mgslpc_device_list)
2807 mgslpc_remove_device(mgslpc_device_list);
2808
2809 if (serial_driver) {
2810 if ((rc = tty_unregister_driver(serial_driver)))
2811 printk("%s(%d) failed to unregister tty driver err=%d\n",
2812 __FILE__,__LINE__,rc);
2813 put_tty_driver(serial_driver);
2814 }
2815
2816 pcmcia_unregister_driver(&mgslpc_driver);
2817 }
2818
synclink_cs_init(void)2819 static int __init synclink_cs_init(void)
2820 {
2821 int rc;
2822
2823 if (break_on_load) {
2824 mgslpc_get_text_ptr();
2825 BREAKPOINT();
2826 }
2827
2828 if ((rc = pcmcia_register_driver(&mgslpc_driver)) < 0)
2829 return rc;
2830
2831 serial_driver = alloc_tty_driver(MAX_DEVICE_COUNT);
2832 if (!serial_driver) {
2833 rc = -ENOMEM;
2834 goto error;
2835 }
2836
2837 /* Initialize the tty_driver structure */
2838
2839 serial_driver->owner = THIS_MODULE;
2840 serial_driver->driver_name = "synclink_cs";
2841 serial_driver->name = "ttySLP";
2842 serial_driver->major = ttymajor;
2843 serial_driver->minor_start = 64;
2844 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2845 serial_driver->subtype = SERIAL_TYPE_NORMAL;
2846 serial_driver->init_termios = tty_std_termios;
2847 serial_driver->init_termios.c_cflag =
2848 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2849 serial_driver->flags = TTY_DRIVER_REAL_RAW;
2850 tty_set_operations(serial_driver, &mgslpc_ops);
2851
2852 if ((rc = tty_register_driver(serial_driver)) < 0) {
2853 printk("%s(%d):Couldn't register serial driver\n",
2854 __FILE__,__LINE__);
2855 put_tty_driver(serial_driver);
2856 serial_driver = NULL;
2857 goto error;
2858 }
2859
2860 printk("%s %s, tty major#%d\n",
2861 driver_name, driver_version,
2862 serial_driver->major);
2863
2864 return 0;
2865
2866 error:
2867 synclink_cs_cleanup();
2868 return rc;
2869 }
2870
synclink_cs_exit(void)2871 static void __exit synclink_cs_exit(void)
2872 {
2873 synclink_cs_cleanup();
2874 }
2875
2876 module_init(synclink_cs_init);
2877 module_exit(synclink_cs_exit);
2878
mgslpc_set_rate(MGSLPC_INFO * info,unsigned char channel,unsigned int rate)2879 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2880 {
2881 unsigned int M, N;
2882 unsigned char val;
2883
2884 /* note:standard BRG mode is broken in V3.2 chip
2885 * so enhanced mode is always used
2886 */
2887
2888 if (rate) {
2889 N = 3686400 / rate;
2890 if (!N)
2891 N = 1;
2892 N >>= 1;
2893 for (M = 1; N > 64 && M < 16; M++)
2894 N >>= 1;
2895 N--;
2896
2897 /* BGR[5..0] = N
2898 * BGR[9..6] = M
2899 * BGR[7..0] contained in BGR register
2900 * BGR[9..8] contained in CCR2[7..6]
2901 * divisor = (N+1)*2^M
2902 *
2903 * Note: M *must* not be zero (causes asymetric duty cycle)
2904 */
2905 write_reg(info, (unsigned char) (channel + BGR),
2906 (unsigned char) ((M << 6) + N));
2907 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2908 val |= ((M << 4) & 0xc0);
2909 write_reg(info, (unsigned char) (channel + CCR2), val);
2910 }
2911 }
2912
2913 /* Enabled the AUX clock output at the specified frequency.
2914 */
enable_auxclk(MGSLPC_INFO * info)2915 static void enable_auxclk(MGSLPC_INFO *info)
2916 {
2917 unsigned char val;
2918
2919 /* MODE
2920 *
2921 * 07..06 MDS[1..0] 10 = transparent HDLC mode
2922 * 05 ADM Address Mode, 0 = no addr recognition
2923 * 04 TMD Timer Mode, 0 = external
2924 * 03 RAC Receiver Active, 0 = inactive
2925 * 02 RTS 0=RTS active during xmit, 1=RTS always active
2926 * 01 TRS Timer Resolution, 1=512
2927 * 00 TLP Test Loop, 0 = no loop
2928 *
2929 * 1000 0010
2930 */
2931 val = 0x82;
2932
2933 /* channel B RTS is used to enable AUXCLK driver on SP505 */
2934 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2935 val |= BIT2;
2936 write_reg(info, CHB + MODE, val);
2937
2938 /* CCR0
2939 *
2940 * 07 PU Power Up, 1=active, 0=power down
2941 * 06 MCE Master Clock Enable, 1=enabled
2942 * 05 Reserved, 0
2943 * 04..02 SC[2..0] Encoding
2944 * 01..00 SM[1..0] Serial Mode, 00=HDLC
2945 *
2946 * 11000000
2947 */
2948 write_reg(info, CHB + CCR0, 0xc0);
2949
2950 /* CCR1
2951 *
2952 * 07 SFLG Shared Flag, 0 = disable shared flags
2953 * 06 GALP Go Active On Loop, 0 = not used
2954 * 05 GLP Go On Loop, 0 = not used
2955 * 04 ODS Output Driver Select, 1=TxD is push-pull output
2956 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
2957 * 02..00 CM[2..0] Clock Mode
2958 *
2959 * 0001 0111
2960 */
2961 write_reg(info, CHB + CCR1, 0x17);
2962
2963 /* CCR2 (Channel B)
2964 *
2965 * 07..06 BGR[9..8] Baud rate bits 9..8
2966 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
2967 * 04 SSEL Clock source select, 1=submode b
2968 * 03 TOE 0=TxCLK is input, 1=TxCLK is output
2969 * 02 RWX Read/Write Exchange 0=disabled
2970 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
2971 * 00 DIV, data inversion 0=disabled, 1=enabled
2972 *
2973 * 0011 1000
2974 */
2975 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2976 write_reg(info, CHB + CCR2, 0x38);
2977 else
2978 write_reg(info, CHB + CCR2, 0x30);
2979
2980 /* CCR4
2981 *
2982 * 07 MCK4 Master Clock Divide by 4, 1=enabled
2983 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
2984 * 05 TST1 Test Pin, 0=normal operation
2985 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
2986 * 03..02 Reserved, must be 0
2987 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
2988 *
2989 * 0101 0000
2990 */
2991 write_reg(info, CHB + CCR4, 0x50);
2992
2993 /* if auxclk not enabled, set internal BRG so
2994 * CTS transitions can be detected (requires TxC)
2995 */
2996 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
2997 mgslpc_set_rate(info, CHB, info->params.clock_speed);
2998 else
2999 mgslpc_set_rate(info, CHB, 921600);
3000 }
3001
loopback_enable(MGSLPC_INFO * info)3002 static void loopback_enable(MGSLPC_INFO *info)
3003 {
3004 unsigned char val;
3005
3006 /* CCR1:02..00 CM[2..0] Clock Mode = 111 (clock mode 7) */
3007 val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3008 write_reg(info, CHA + CCR1, val);
3009
3010 /* CCR2:04 SSEL Clock source select, 1=submode b */
3011 val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3012 write_reg(info, CHA + CCR2, val);
3013
3014 /* set LinkSpeed if available, otherwise default to 2Mbps */
3015 if (info->params.clock_speed)
3016 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3017 else
3018 mgslpc_set_rate(info, CHA, 1843200);
3019
3020 /* MODE:00 TLP Test Loop, 1=loopback enabled */
3021 val = read_reg(info, CHA + MODE) | BIT0;
3022 write_reg(info, CHA + MODE, val);
3023 }
3024
hdlc_mode(MGSLPC_INFO * info)3025 static void hdlc_mode(MGSLPC_INFO *info)
3026 {
3027 unsigned char val;
3028 unsigned char clkmode, clksubmode;
3029
3030 /* disable all interrupts */
3031 irq_disable(info, CHA, 0xffff);
3032 irq_disable(info, CHB, 0xffff);
3033 port_irq_disable(info, 0xff);
3034
3035 /* assume clock mode 0a, rcv=RxC xmt=TxC */
3036 clkmode = clksubmode = 0;
3037 if (info->params.flags & HDLC_FLAG_RXC_DPLL
3038 && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3039 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3040 clkmode = 7;
3041 } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3042 && info->params.flags & HDLC_FLAG_TXC_BRG) {
3043 /* clock mode 7b, rcv = BRG, xmt = BRG */
3044 clkmode = 7;
3045 clksubmode = 1;
3046 } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3047 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3048 /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3049 clkmode = 6;
3050 clksubmode = 1;
3051 } else {
3052 /* clock mode 6a, rcv = DPLL, xmt = TxC */
3053 clkmode = 6;
3054 }
3055 } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3056 /* clock mode 0b, rcv = RxC, xmt = BRG */
3057 clksubmode = 1;
3058 }
3059
3060 /* MODE
3061 *
3062 * 07..06 MDS[1..0] 10 = transparent HDLC mode
3063 * 05 ADM Address Mode, 0 = no addr recognition
3064 * 04 TMD Timer Mode, 0 = external
3065 * 03 RAC Receiver Active, 0 = inactive
3066 * 02 RTS 0=RTS active during xmit, 1=RTS always active
3067 * 01 TRS Timer Resolution, 1=512
3068 * 00 TLP Test Loop, 0 = no loop
3069 *
3070 * 1000 0010
3071 */
3072 val = 0x82;
3073 if (info->params.loopback)
3074 val |= BIT0;
3075
3076 /* preserve RTS state */
3077 if (info->serial_signals & SerialSignal_RTS)
3078 val |= BIT2;
3079 write_reg(info, CHA + MODE, val);
3080
3081 /* CCR0
3082 *
3083 * 07 PU Power Up, 1=active, 0=power down
3084 * 06 MCE Master Clock Enable, 1=enabled
3085 * 05 Reserved, 0
3086 * 04..02 SC[2..0] Encoding
3087 * 01..00 SM[1..0] Serial Mode, 00=HDLC
3088 *
3089 * 11000000
3090 */
3091 val = 0xc0;
3092 switch (info->params.encoding)
3093 {
3094 case HDLC_ENCODING_NRZI:
3095 val |= BIT3;
3096 break;
3097 case HDLC_ENCODING_BIPHASE_SPACE:
3098 val |= BIT4;
3099 break; // FM0
3100 case HDLC_ENCODING_BIPHASE_MARK:
3101 val |= BIT4 + BIT2;
3102 break; // FM1
3103 case HDLC_ENCODING_BIPHASE_LEVEL:
3104 val |= BIT4 + BIT3;
3105 break; // Manchester
3106 }
3107 write_reg(info, CHA + CCR0, val);
3108
3109 /* CCR1
3110 *
3111 * 07 SFLG Shared Flag, 0 = disable shared flags
3112 * 06 GALP Go Active On Loop, 0 = not used
3113 * 05 GLP Go On Loop, 0 = not used
3114 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3115 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
3116 * 02..00 CM[2..0] Clock Mode
3117 *
3118 * 0001 0000
3119 */
3120 val = 0x10 + clkmode;
3121 write_reg(info, CHA + CCR1, val);
3122
3123 /* CCR2
3124 *
3125 * 07..06 BGR[9..8] Baud rate bits 9..8
3126 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3127 * 04 SSEL Clock source select, 1=submode b
3128 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3129 * 02 RWX Read/Write Exchange 0=disabled
3130 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
3131 * 00 DIV, data inversion 0=disabled, 1=enabled
3132 *
3133 * 0000 0000
3134 */
3135 val = 0x00;
3136 if (clkmode == 2 || clkmode == 3 || clkmode == 6
3137 || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3138 val |= BIT5;
3139 if (clksubmode)
3140 val |= BIT4;
3141 if (info->params.crc_type == HDLC_CRC_32_CCITT)
3142 val |= BIT1;
3143 if (info->params.encoding == HDLC_ENCODING_NRZB)
3144 val |= BIT0;
3145 write_reg(info, CHA + CCR2, val);
3146
3147 /* CCR3
3148 *
3149 * 07..06 PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3150 * 05 EPT Enable preamble transmission, 1=enabled
3151 * 04 RADD Receive address pushed to FIFO, 0=disabled
3152 * 03 CRL CRC Reset Level, 0=FFFF
3153 * 02 RCRC Rx CRC 0=On 1=Off
3154 * 01 TCRC Tx CRC 0=On 1=Off
3155 * 00 PSD DPLL Phase Shift Disable
3156 *
3157 * 0000 0000
3158 */
3159 val = 0x00;
3160 if (info->params.crc_type == HDLC_CRC_NONE)
3161 val |= BIT2 + BIT1;
3162 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3163 val |= BIT5;
3164 switch (info->params.preamble_length)
3165 {
3166 case HDLC_PREAMBLE_LENGTH_16BITS:
3167 val |= BIT6;
3168 break;
3169 case HDLC_PREAMBLE_LENGTH_32BITS:
3170 val |= BIT6;
3171 break;
3172 case HDLC_PREAMBLE_LENGTH_64BITS:
3173 val |= BIT7 + BIT6;
3174 break;
3175 }
3176 write_reg(info, CHA + CCR3, val);
3177
3178 /* PRE - Preamble pattern */
3179 val = 0;
3180 switch (info->params.preamble)
3181 {
3182 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3183 case HDLC_PREAMBLE_PATTERN_10: val = 0xaa; break;
3184 case HDLC_PREAMBLE_PATTERN_01: val = 0x55; break;
3185 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
3186 }
3187 write_reg(info, CHA + PRE, val);
3188
3189 /* CCR4
3190 *
3191 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3192 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3193 * 05 TST1 Test Pin, 0=normal operation
3194 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3195 * 03..02 Reserved, must be 0
3196 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3197 *
3198 * 0101 0000
3199 */
3200 val = 0x50;
3201 write_reg(info, CHA + CCR4, val);
3202 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3203 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3204 else
3205 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3206
3207 /* RLCR Receive length check register
3208 *
3209 * 7 1=enable receive length check
3210 * 6..0 Max frame length = (RL + 1) * 32
3211 */
3212 write_reg(info, CHA + RLCR, 0);
3213
3214 /* XBCH Transmit Byte Count High
3215 *
3216 * 07 DMA mode, 0 = interrupt driven
3217 * 06 NRM, 0=ABM (ignored)
3218 * 05 CAS Carrier Auto Start
3219 * 04 XC Transmit Continuously (ignored)
3220 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3221 *
3222 * 0000 0000
3223 */
3224 val = 0x00;
3225 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3226 val |= BIT5;
3227 write_reg(info, CHA + XBCH, val);
3228 enable_auxclk(info);
3229 if (info->params.loopback || info->testing_irq)
3230 loopback_enable(info);
3231 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3232 {
3233 irq_enable(info, CHB, IRQ_CTS);
3234 /* PVR[3] 1=AUTO CTS active */
3235 set_reg_bits(info, CHA + PVR, BIT3);
3236 } else
3237 clear_reg_bits(info, CHA + PVR, BIT3);
3238
3239 irq_enable(info, CHA,
3240 IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3241 IRQ_UNDERRUN + IRQ_TXFIFO);
3242 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3243 wait_command_complete(info, CHA);
3244 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3245
3246 /* Master clock mode enabled above to allow reset commands
3247 * to complete even if no data clocks are present.
3248 *
3249 * Disable master clock mode for normal communications because
3250 * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3251 * IRQ when in master clock mode.
3252 *
3253 * Leave master clock mode enabled for IRQ test because the
3254 * timer IRQ used by the test can only happen in master clock mode.
3255 */
3256 if (!info->testing_irq)
3257 clear_reg_bits(info, CHA + CCR0, BIT6);
3258
3259 tx_set_idle(info);
3260
3261 tx_stop(info);
3262 rx_stop(info);
3263 }
3264
rx_stop(MGSLPC_INFO * info)3265 static void rx_stop(MGSLPC_INFO *info)
3266 {
3267 if (debug_level >= DEBUG_LEVEL_ISR)
3268 printk("%s(%d):rx_stop(%s)\n",
3269 __FILE__,__LINE__, info->device_name );
3270
3271 /* MODE:03 RAC Receiver Active, 0=inactive */
3272 clear_reg_bits(info, CHA + MODE, BIT3);
3273
3274 info->rx_enabled = false;
3275 info->rx_overflow = false;
3276 }
3277
rx_start(MGSLPC_INFO * info)3278 static void rx_start(MGSLPC_INFO *info)
3279 {
3280 if (debug_level >= DEBUG_LEVEL_ISR)
3281 printk("%s(%d):rx_start(%s)\n",
3282 __FILE__,__LINE__, info->device_name );
3283
3284 rx_reset_buffers(info);
3285 info->rx_enabled = false;
3286 info->rx_overflow = false;
3287
3288 /* MODE:03 RAC Receiver Active, 1=active */
3289 set_reg_bits(info, CHA + MODE, BIT3);
3290
3291 info->rx_enabled = true;
3292 }
3293
tx_start(MGSLPC_INFO * info,struct tty_struct * tty)3294 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3295 {
3296 if (debug_level >= DEBUG_LEVEL_ISR)
3297 printk("%s(%d):tx_start(%s)\n",
3298 __FILE__,__LINE__, info->device_name );
3299
3300 if (info->tx_count) {
3301 /* If auto RTS enabled and RTS is inactive, then assert */
3302 /* RTS and set a flag indicating that the driver should */
3303 /* negate RTS when the transmission completes. */
3304 info->drop_rts_on_tx_done = false;
3305
3306 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3307 get_signals(info);
3308 if (!(info->serial_signals & SerialSignal_RTS)) {
3309 info->serial_signals |= SerialSignal_RTS;
3310 set_signals(info);
3311 info->drop_rts_on_tx_done = true;
3312 }
3313 }
3314
3315 if (info->params.mode == MGSL_MODE_ASYNC) {
3316 if (!info->tx_active) {
3317 info->tx_active = true;
3318 tx_ready(info, tty);
3319 }
3320 } else {
3321 info->tx_active = true;
3322 tx_ready(info, tty);
3323 mod_timer(&info->tx_timer, jiffies +
3324 msecs_to_jiffies(5000));
3325 }
3326 }
3327
3328 if (!info->tx_enabled)
3329 info->tx_enabled = true;
3330 }
3331
tx_stop(MGSLPC_INFO * info)3332 static void tx_stop(MGSLPC_INFO *info)
3333 {
3334 if (debug_level >= DEBUG_LEVEL_ISR)
3335 printk("%s(%d):tx_stop(%s)\n",
3336 __FILE__,__LINE__, info->device_name );
3337
3338 del_timer(&info->tx_timer);
3339
3340 info->tx_enabled = false;
3341 info->tx_active = false;
3342 }
3343
3344 /* Reset the adapter to a known state and prepare it for further use.
3345 */
reset_device(MGSLPC_INFO * info)3346 static void reset_device(MGSLPC_INFO *info)
3347 {
3348 /* power up both channels (set BIT7) */
3349 write_reg(info, CHA + CCR0, 0x80);
3350 write_reg(info, CHB + CCR0, 0x80);
3351 write_reg(info, CHA + MODE, 0);
3352 write_reg(info, CHB + MODE, 0);
3353
3354 /* disable all interrupts */
3355 irq_disable(info, CHA, 0xffff);
3356 irq_disable(info, CHB, 0xffff);
3357 port_irq_disable(info, 0xff);
3358
3359 /* PCR Port Configuration Register
3360 *
3361 * 07..04 DEC[3..0] Serial I/F select outputs
3362 * 03 output, 1=AUTO CTS control enabled
3363 * 02 RI Ring Indicator input 0=active
3364 * 01 DSR input 0=active
3365 * 00 DTR output 0=active
3366 *
3367 * 0000 0110
3368 */
3369 write_reg(info, PCR, 0x06);
3370
3371 /* PVR Port Value Register
3372 *
3373 * 07..04 DEC[3..0] Serial I/F select (0000=disabled)
3374 * 03 AUTO CTS output 1=enabled
3375 * 02 RI Ring Indicator input
3376 * 01 DSR input
3377 * 00 DTR output (1=inactive)
3378 *
3379 * 0000 0001
3380 */
3381 // write_reg(info, PVR, PVR_DTR);
3382
3383 /* IPC Interrupt Port Configuration
3384 *
3385 * 07 VIS 1=Masked interrupts visible
3386 * 06..05 Reserved, 0
3387 * 04..03 SLA Slave address, 00 ignored
3388 * 02 CASM Cascading Mode, 1=daisy chain
3389 * 01..00 IC[1..0] Interrupt Config, 01=push-pull output, active low
3390 *
3391 * 0000 0101
3392 */
3393 write_reg(info, IPC, 0x05);
3394 }
3395
async_mode(MGSLPC_INFO * info)3396 static void async_mode(MGSLPC_INFO *info)
3397 {
3398 unsigned char val;
3399
3400 /* disable all interrupts */
3401 irq_disable(info, CHA, 0xffff);
3402 irq_disable(info, CHB, 0xffff);
3403 port_irq_disable(info, 0xff);
3404
3405 /* MODE
3406 *
3407 * 07 Reserved, 0
3408 * 06 FRTS RTS State, 0=active
3409 * 05 FCTS Flow Control on CTS
3410 * 04 FLON Flow Control Enable
3411 * 03 RAC Receiver Active, 0 = inactive
3412 * 02 RTS 0=Auto RTS, 1=manual RTS
3413 * 01 TRS Timer Resolution, 1=512
3414 * 00 TLP Test Loop, 0 = no loop
3415 *
3416 * 0000 0110
3417 */
3418 val = 0x06;
3419 if (info->params.loopback)
3420 val |= BIT0;
3421
3422 /* preserve RTS state */
3423 if (!(info->serial_signals & SerialSignal_RTS))
3424 val |= BIT6;
3425 write_reg(info, CHA + MODE, val);
3426
3427 /* CCR0
3428 *
3429 * 07 PU Power Up, 1=active, 0=power down
3430 * 06 MCE Master Clock Enable, 1=enabled
3431 * 05 Reserved, 0
3432 * 04..02 SC[2..0] Encoding, 000=NRZ
3433 * 01..00 SM[1..0] Serial Mode, 11=Async
3434 *
3435 * 1000 0011
3436 */
3437 write_reg(info, CHA + CCR0, 0x83);
3438
3439 /* CCR1
3440 *
3441 * 07..05 Reserved, 0
3442 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3443 * 03 BCR Bit Clock Rate, 1=16x
3444 * 02..00 CM[2..0] Clock Mode, 111=BRG
3445 *
3446 * 0001 1111
3447 */
3448 write_reg(info, CHA + CCR1, 0x1f);
3449
3450 /* CCR2 (channel A)
3451 *
3452 * 07..06 BGR[9..8] Baud rate bits 9..8
3453 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3454 * 04 SSEL Clock source select, 1=submode b
3455 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3456 * 02 RWX Read/Write Exchange 0=disabled
3457 * 01 Reserved, 0
3458 * 00 DIV, data inversion 0=disabled, 1=enabled
3459 *
3460 * 0001 0000
3461 */
3462 write_reg(info, CHA + CCR2, 0x10);
3463
3464 /* CCR3
3465 *
3466 * 07..01 Reserved, 0
3467 * 00 PSD DPLL Phase Shift Disable
3468 *
3469 * 0000 0000
3470 */
3471 write_reg(info, CHA + CCR3, 0);
3472
3473 /* CCR4
3474 *
3475 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3476 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3477 * 05 TST1 Test Pin, 0=normal operation
3478 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3479 * 03..00 Reserved, must be 0
3480 *
3481 * 0101 0000
3482 */
3483 write_reg(info, CHA + CCR4, 0x50);
3484 mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3485
3486 /* DAFO Data Format
3487 *
3488 * 07 Reserved, 0
3489 * 06 XBRK transmit break, 0=normal operation
3490 * 05 Stop bits (0=1, 1=2)
3491 * 04..03 PAR[1..0] Parity (01=odd, 10=even)
3492 * 02 PAREN Parity Enable
3493 * 01..00 CHL[1..0] Character Length (00=8, 01=7)
3494 *
3495 */
3496 val = 0x00;
3497 if (info->params.data_bits != 8)
3498 val |= BIT0; /* 7 bits */
3499 if (info->params.stop_bits != 1)
3500 val |= BIT5;
3501 if (info->params.parity != ASYNC_PARITY_NONE)
3502 {
3503 val |= BIT2; /* Parity enable */
3504 if (info->params.parity == ASYNC_PARITY_ODD)
3505 val |= BIT3;
3506 else
3507 val |= BIT4;
3508 }
3509 write_reg(info, CHA + DAFO, val);
3510
3511 /* RFC Rx FIFO Control
3512 *
3513 * 07 Reserved, 0
3514 * 06 DPS, 1=parity bit not stored in data byte
3515 * 05 DXS, 0=all data stored in FIFO (including XON/XOFF)
3516 * 04 RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3517 * 03..02 RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3518 * 01 Reserved, 0
3519 * 00 TCDE Terminate Char Detect Enable, 0=disabled
3520 *
3521 * 0101 1100
3522 */
3523 write_reg(info, CHA + RFC, 0x5c);
3524
3525 /* RLCR Receive length check register
3526 *
3527 * Max frame length = (RL + 1) * 32
3528 */
3529 write_reg(info, CHA + RLCR, 0);
3530
3531 /* XBCH Transmit Byte Count High
3532 *
3533 * 07 DMA mode, 0 = interrupt driven
3534 * 06 NRM, 0=ABM (ignored)
3535 * 05 CAS Carrier Auto Start
3536 * 04 XC Transmit Continuously (ignored)
3537 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3538 *
3539 * 0000 0000
3540 */
3541 val = 0x00;
3542 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3543 val |= BIT5;
3544 write_reg(info, CHA + XBCH, val);
3545 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3546 irq_enable(info, CHA, IRQ_CTS);
3547
3548 /* MODE:03 RAC Receiver Active, 1=active */
3549 set_reg_bits(info, CHA + MODE, BIT3);
3550 enable_auxclk(info);
3551 if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3552 irq_enable(info, CHB, IRQ_CTS);
3553 /* PVR[3] 1=AUTO CTS active */
3554 set_reg_bits(info, CHA + PVR, BIT3);
3555 } else
3556 clear_reg_bits(info, CHA + PVR, BIT3);
3557 irq_enable(info, CHA,
3558 IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3559 IRQ_ALLSENT + IRQ_TXFIFO);
3560 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3561 wait_command_complete(info, CHA);
3562 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3563 }
3564
3565 /* Set the HDLC idle mode for the transmitter.
3566 */
tx_set_idle(MGSLPC_INFO * info)3567 static void tx_set_idle(MGSLPC_INFO *info)
3568 {
3569 /* Note: ESCC2 only supports flags and one idle modes */
3570 if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3571 set_reg_bits(info, CHA + CCR1, BIT3);
3572 else
3573 clear_reg_bits(info, CHA + CCR1, BIT3);
3574 }
3575
3576 /* get state of the V24 status (input) signals.
3577 */
get_signals(MGSLPC_INFO * info)3578 static void get_signals(MGSLPC_INFO *info)
3579 {
3580 unsigned char status = 0;
3581
3582 /* preserve DTR and RTS */
3583 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
3584
3585 if (read_reg(info, CHB + VSTR) & BIT7)
3586 info->serial_signals |= SerialSignal_DCD;
3587 if (read_reg(info, CHB + STAR) & BIT1)
3588 info->serial_signals |= SerialSignal_CTS;
3589
3590 status = read_reg(info, CHA + PVR);
3591 if (!(status & PVR_RI))
3592 info->serial_signals |= SerialSignal_RI;
3593 if (!(status & PVR_DSR))
3594 info->serial_signals |= SerialSignal_DSR;
3595 }
3596
3597 /* Set the state of DTR and RTS based on contents of
3598 * serial_signals member of device extension.
3599 */
set_signals(MGSLPC_INFO * info)3600 static void set_signals(MGSLPC_INFO *info)
3601 {
3602 unsigned char val;
3603
3604 val = read_reg(info, CHA + MODE);
3605 if (info->params.mode == MGSL_MODE_ASYNC) {
3606 if (info->serial_signals & SerialSignal_RTS)
3607 val &= ~BIT6;
3608 else
3609 val |= BIT6;
3610 } else {
3611 if (info->serial_signals & SerialSignal_RTS)
3612 val |= BIT2;
3613 else
3614 val &= ~BIT2;
3615 }
3616 write_reg(info, CHA + MODE, val);
3617
3618 if (info->serial_signals & SerialSignal_DTR)
3619 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3620 else
3621 set_reg_bits(info, CHA + PVR, PVR_DTR);
3622 }
3623
rx_reset_buffers(MGSLPC_INFO * info)3624 static void rx_reset_buffers(MGSLPC_INFO *info)
3625 {
3626 RXBUF *buf;
3627 int i;
3628
3629 info->rx_put = 0;
3630 info->rx_get = 0;
3631 info->rx_frame_count = 0;
3632 for (i=0 ; i < info->rx_buf_count ; i++) {
3633 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3634 buf->status = buf->count = 0;
3635 }
3636 }
3637
3638 /* Attempt to return a received HDLC frame
3639 * Only frames received without errors are returned.
3640 *
3641 * Returns true if frame returned, otherwise false
3642 */
rx_get_frame(MGSLPC_INFO * info,struct tty_struct * tty)3643 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3644 {
3645 unsigned short status;
3646 RXBUF *buf;
3647 unsigned int framesize = 0;
3648 unsigned long flags;
3649 bool return_frame = false;
3650
3651 if (info->rx_frame_count == 0)
3652 return false;
3653
3654 buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3655
3656 status = buf->status;
3657
3658 /* 07 VFR 1=valid frame
3659 * 06 RDO 1=data overrun
3660 * 05 CRC 1=OK, 0=error
3661 * 04 RAB 1=frame aborted
3662 */
3663 if ((status & 0xf0) != 0xA0) {
3664 if (!(status & BIT7) || (status & BIT4))
3665 info->icount.rxabort++;
3666 else if (status & BIT6)
3667 info->icount.rxover++;
3668 else if (!(status & BIT5)) {
3669 info->icount.rxcrc++;
3670 if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3671 return_frame = true;
3672 }
3673 framesize = 0;
3674 #if SYNCLINK_GENERIC_HDLC
3675 {
3676 info->netdev->stats.rx_errors++;
3677 info->netdev->stats.rx_frame_errors++;
3678 }
3679 #endif
3680 } else
3681 return_frame = true;
3682
3683 if (return_frame)
3684 framesize = buf->count;
3685
3686 if (debug_level >= DEBUG_LEVEL_BH)
3687 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3688 __FILE__,__LINE__,info->device_name,status,framesize);
3689
3690 if (debug_level >= DEBUG_LEVEL_DATA)
3691 trace_block(info, buf->data, framesize, 0);
3692
3693 if (framesize) {
3694 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3695 framesize+1 > info->max_frame_size) ||
3696 framesize > info->max_frame_size)
3697 info->icount.rxlong++;
3698 else {
3699 if (status & BIT5)
3700 info->icount.rxok++;
3701
3702 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3703 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3704 ++framesize;
3705 }
3706
3707 #if SYNCLINK_GENERIC_HDLC
3708 if (info->netcount)
3709 hdlcdev_rx(info, buf->data, framesize);
3710 else
3711 #endif
3712 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3713 }
3714 }
3715
3716 spin_lock_irqsave(&info->lock,flags);
3717 buf->status = buf->count = 0;
3718 info->rx_frame_count--;
3719 info->rx_get++;
3720 if (info->rx_get >= info->rx_buf_count)
3721 info->rx_get = 0;
3722 spin_unlock_irqrestore(&info->lock,flags);
3723
3724 return true;
3725 }
3726
register_test(MGSLPC_INFO * info)3727 static bool register_test(MGSLPC_INFO *info)
3728 {
3729 static unsigned char patterns[] =
3730 { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3731 static unsigned int count = ARRAY_SIZE(patterns);
3732 unsigned int i;
3733 bool rc = true;
3734 unsigned long flags;
3735
3736 spin_lock_irqsave(&info->lock,flags);
3737 reset_device(info);
3738
3739 for (i = 0; i < count; i++) {
3740 write_reg(info, XAD1, patterns[i]);
3741 write_reg(info, XAD2, patterns[(i + 1) % count]);
3742 if ((read_reg(info, XAD1) != patterns[i]) ||
3743 (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3744 rc = false;
3745 break;
3746 }
3747 }
3748
3749 spin_unlock_irqrestore(&info->lock,flags);
3750 return rc;
3751 }
3752
irq_test(MGSLPC_INFO * info)3753 static bool irq_test(MGSLPC_INFO *info)
3754 {
3755 unsigned long end_time;
3756 unsigned long flags;
3757
3758 spin_lock_irqsave(&info->lock,flags);
3759 reset_device(info);
3760
3761 info->testing_irq = true;
3762 hdlc_mode(info);
3763
3764 info->irq_occurred = false;
3765
3766 /* init hdlc mode */
3767
3768 irq_enable(info, CHA, IRQ_TIMER);
3769 write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3770 issue_command(info, CHA, CMD_START_TIMER);
3771
3772 spin_unlock_irqrestore(&info->lock,flags);
3773
3774 end_time=100;
3775 while(end_time-- && !info->irq_occurred) {
3776 msleep_interruptible(10);
3777 }
3778
3779 info->testing_irq = false;
3780
3781 spin_lock_irqsave(&info->lock,flags);
3782 reset_device(info);
3783 spin_unlock_irqrestore(&info->lock,flags);
3784
3785 return info->irq_occurred;
3786 }
3787
adapter_test(MGSLPC_INFO * info)3788 static int adapter_test(MGSLPC_INFO *info)
3789 {
3790 if (!register_test(info)) {
3791 info->init_error = DiagStatus_AddressFailure;
3792 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
3793 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
3794 return -ENODEV;
3795 }
3796
3797 if (!irq_test(info)) {
3798 info->init_error = DiagStatus_IrqFailure;
3799 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3800 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
3801 return -ENODEV;
3802 }
3803
3804 if (debug_level >= DEBUG_LEVEL_INFO)
3805 printk("%s(%d):device %s passed diagnostics\n",
3806 __FILE__,__LINE__,info->device_name);
3807 return 0;
3808 }
3809
trace_block(MGSLPC_INFO * info,const char * data,int count,int xmit)3810 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3811 {
3812 int i;
3813 int linecount;
3814 if (xmit)
3815 printk("%s tx data:\n",info->device_name);
3816 else
3817 printk("%s rx data:\n",info->device_name);
3818
3819 while(count) {
3820 if (count > 16)
3821 linecount = 16;
3822 else
3823 linecount = count;
3824
3825 for(i=0;i<linecount;i++)
3826 printk("%02X ",(unsigned char)data[i]);
3827 for(;i<17;i++)
3828 printk(" ");
3829 for(i=0;i<linecount;i++) {
3830 if (data[i]>=040 && data[i]<=0176)
3831 printk("%c",data[i]);
3832 else
3833 printk(".");
3834 }
3835 printk("\n");
3836
3837 data += linecount;
3838 count -= linecount;
3839 }
3840 }
3841
3842 /* HDLC frame time out
3843 * update stats and do tx completion processing
3844 */
tx_timeout(unsigned long context)3845 static void tx_timeout(unsigned long context)
3846 {
3847 MGSLPC_INFO *info = (MGSLPC_INFO*)context;
3848 unsigned long flags;
3849
3850 if ( debug_level >= DEBUG_LEVEL_INFO )
3851 printk( "%s(%d):tx_timeout(%s)\n",
3852 __FILE__,__LINE__,info->device_name);
3853 if(info->tx_active &&
3854 info->params.mode == MGSL_MODE_HDLC) {
3855 info->icount.txtimeout++;
3856 }
3857 spin_lock_irqsave(&info->lock,flags);
3858 info->tx_active = false;
3859 info->tx_count = info->tx_put = info->tx_get = 0;
3860
3861 spin_unlock_irqrestore(&info->lock,flags);
3862
3863 #if SYNCLINK_GENERIC_HDLC
3864 if (info->netcount)
3865 hdlcdev_tx_done(info);
3866 else
3867 #endif
3868 {
3869 struct tty_struct *tty = tty_port_tty_get(&info->port);
3870 bh_transmit(info, tty);
3871 tty_kref_put(tty);
3872 }
3873 }
3874
3875 #if SYNCLINK_GENERIC_HDLC
3876
3877 /**
3878 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3879 * set encoding and frame check sequence (FCS) options
3880 *
3881 * dev pointer to network device structure
3882 * encoding serial encoding setting
3883 * parity FCS setting
3884 *
3885 * returns 0 if success, otherwise error code
3886 */
hdlcdev_attach(struct net_device * dev,unsigned short encoding,unsigned short parity)3887 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3888 unsigned short parity)
3889 {
3890 MGSLPC_INFO *info = dev_to_port(dev);
3891 struct tty_struct *tty;
3892 unsigned char new_encoding;
3893 unsigned short new_crctype;
3894
3895 /* return error if TTY interface open */
3896 if (info->port.count)
3897 return -EBUSY;
3898
3899 switch (encoding)
3900 {
3901 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
3902 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3903 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3904 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3905 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3906 default: return -EINVAL;
3907 }
3908
3909 switch (parity)
3910 {
3911 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
3912 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3913 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3914 default: return -EINVAL;
3915 }
3916
3917 info->params.encoding = new_encoding;
3918 info->params.crc_type = new_crctype;
3919
3920 /* if network interface up, reprogram hardware */
3921 if (info->netcount) {
3922 tty = tty_port_tty_get(&info->port);
3923 mgslpc_program_hw(info, tty);
3924 tty_kref_put(tty);
3925 }
3926
3927 return 0;
3928 }
3929
3930 /**
3931 * called by generic HDLC layer to send frame
3932 *
3933 * skb socket buffer containing HDLC frame
3934 * dev pointer to network device structure
3935 */
hdlcdev_xmit(struct sk_buff * skb,struct net_device * dev)3936 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
3937 struct net_device *dev)
3938 {
3939 MGSLPC_INFO *info = dev_to_port(dev);
3940 unsigned long flags;
3941
3942 if (debug_level >= DEBUG_LEVEL_INFO)
3943 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
3944
3945 /* stop sending until this frame completes */
3946 netif_stop_queue(dev);
3947
3948 /* copy data to device buffers */
3949 skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
3950 info->tx_get = 0;
3951 info->tx_put = info->tx_count = skb->len;
3952
3953 /* update network statistics */
3954 dev->stats.tx_packets++;
3955 dev->stats.tx_bytes += skb->len;
3956
3957 /* done with socket buffer, so free it */
3958 dev_kfree_skb(skb);
3959
3960 /* save start time for transmit timeout detection */
3961 dev->trans_start = jiffies;
3962
3963 /* start hardware transmitter if necessary */
3964 spin_lock_irqsave(&info->lock,flags);
3965 if (!info->tx_active) {
3966 struct tty_struct *tty = tty_port_tty_get(&info->port);
3967 tx_start(info, tty);
3968 tty_kref_put(tty);
3969 }
3970 spin_unlock_irqrestore(&info->lock,flags);
3971
3972 return NETDEV_TX_OK;
3973 }
3974
3975 /**
3976 * called by network layer when interface enabled
3977 * claim resources and initialize hardware
3978 *
3979 * dev pointer to network device structure
3980 *
3981 * returns 0 if success, otherwise error code
3982 */
hdlcdev_open(struct net_device * dev)3983 static int hdlcdev_open(struct net_device *dev)
3984 {
3985 MGSLPC_INFO *info = dev_to_port(dev);
3986 struct tty_struct *tty;
3987 int rc;
3988 unsigned long flags;
3989
3990 if (debug_level >= DEBUG_LEVEL_INFO)
3991 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
3992
3993 /* generic HDLC layer open processing */
3994 if ((rc = hdlc_open(dev)))
3995 return rc;
3996
3997 /* arbitrate between network and tty opens */
3998 spin_lock_irqsave(&info->netlock, flags);
3999 if (info->port.count != 0 || info->netcount != 0) {
4000 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4001 spin_unlock_irqrestore(&info->netlock, flags);
4002 return -EBUSY;
4003 }
4004 info->netcount=1;
4005 spin_unlock_irqrestore(&info->netlock, flags);
4006
4007 tty = tty_port_tty_get(&info->port);
4008 /* claim resources and init adapter */
4009 if ((rc = startup(info, tty)) != 0) {
4010 tty_kref_put(tty);
4011 spin_lock_irqsave(&info->netlock, flags);
4012 info->netcount=0;
4013 spin_unlock_irqrestore(&info->netlock, flags);
4014 return rc;
4015 }
4016 /* assert DTR and RTS, apply hardware settings */
4017 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4018 mgslpc_program_hw(info, tty);
4019 tty_kref_put(tty);
4020
4021 /* enable network layer transmit */
4022 dev->trans_start = jiffies;
4023 netif_start_queue(dev);
4024
4025 /* inform generic HDLC layer of current DCD status */
4026 spin_lock_irqsave(&info->lock, flags);
4027 get_signals(info);
4028 spin_unlock_irqrestore(&info->lock, flags);
4029 if (info->serial_signals & SerialSignal_DCD)
4030 netif_carrier_on(dev);
4031 else
4032 netif_carrier_off(dev);
4033 return 0;
4034 }
4035
4036 /**
4037 * called by network layer when interface is disabled
4038 * shutdown hardware and release resources
4039 *
4040 * dev pointer to network device structure
4041 *
4042 * returns 0 if success, otherwise error code
4043 */
hdlcdev_close(struct net_device * dev)4044 static int hdlcdev_close(struct net_device *dev)
4045 {
4046 MGSLPC_INFO *info = dev_to_port(dev);
4047 struct tty_struct *tty = tty_port_tty_get(&info->port);
4048 unsigned long flags;
4049
4050 if (debug_level >= DEBUG_LEVEL_INFO)
4051 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
4052
4053 netif_stop_queue(dev);
4054
4055 /* shutdown adapter and release resources */
4056 shutdown(info, tty);
4057 tty_kref_put(tty);
4058 hdlc_close(dev);
4059
4060 spin_lock_irqsave(&info->netlock, flags);
4061 info->netcount=0;
4062 spin_unlock_irqrestore(&info->netlock, flags);
4063
4064 return 0;
4065 }
4066
4067 /**
4068 * called by network layer to process IOCTL call to network device
4069 *
4070 * dev pointer to network device structure
4071 * ifr pointer to network interface request structure
4072 * cmd IOCTL command code
4073 *
4074 * returns 0 if success, otherwise error code
4075 */
hdlcdev_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)4076 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4077 {
4078 const size_t size = sizeof(sync_serial_settings);
4079 sync_serial_settings new_line;
4080 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4081 MGSLPC_INFO *info = dev_to_port(dev);
4082 unsigned int flags;
4083
4084 if (debug_level >= DEBUG_LEVEL_INFO)
4085 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
4086
4087 /* return error if TTY interface open */
4088 if (info->port.count)
4089 return -EBUSY;
4090
4091 if (cmd != SIOCWANDEV)
4092 return hdlc_ioctl(dev, ifr, cmd);
4093
4094 memset(&new_line, 0, size);
4095
4096 switch(ifr->ifr_settings.type) {
4097 case IF_GET_IFACE: /* return current sync_serial_settings */
4098
4099 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4100 if (ifr->ifr_settings.size < size) {
4101 ifr->ifr_settings.size = size; /* data size wanted */
4102 return -ENOBUFS;
4103 }
4104
4105 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4106 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4107 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4108 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4109
4110 switch (flags){
4111 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4112 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
4113 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
4114 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4115 default: new_line.clock_type = CLOCK_DEFAULT;
4116 }
4117
4118 new_line.clock_rate = info->params.clock_speed;
4119 new_line.loopback = info->params.loopback ? 1:0;
4120
4121 if (copy_to_user(line, &new_line, size))
4122 return -EFAULT;
4123 return 0;
4124
4125 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4126
4127 if(!capable(CAP_NET_ADMIN))
4128 return -EPERM;
4129 if (copy_from_user(&new_line, line, size))
4130 return -EFAULT;
4131
4132 switch (new_line.clock_type)
4133 {
4134 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4135 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4136 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
4137 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
4138 case CLOCK_DEFAULT: flags = info->params.flags &
4139 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4140 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4141 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4142 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
4143 default: return -EINVAL;
4144 }
4145
4146 if (new_line.loopback != 0 && new_line.loopback != 1)
4147 return -EINVAL;
4148
4149 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4150 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4151 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4152 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4153 info->params.flags |= flags;
4154
4155 info->params.loopback = new_line.loopback;
4156
4157 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4158 info->params.clock_speed = new_line.clock_rate;
4159 else
4160 info->params.clock_speed = 0;
4161
4162 /* if network interface up, reprogram hardware */
4163 if (info->netcount) {
4164 struct tty_struct *tty = tty_port_tty_get(&info->port);
4165 mgslpc_program_hw(info, tty);
4166 tty_kref_put(tty);
4167 }
4168 return 0;
4169
4170 default:
4171 return hdlc_ioctl(dev, ifr, cmd);
4172 }
4173 }
4174
4175 /**
4176 * called by network layer when transmit timeout is detected
4177 *
4178 * dev pointer to network device structure
4179 */
hdlcdev_tx_timeout(struct net_device * dev)4180 static void hdlcdev_tx_timeout(struct net_device *dev)
4181 {
4182 MGSLPC_INFO *info = dev_to_port(dev);
4183 unsigned long flags;
4184
4185 if (debug_level >= DEBUG_LEVEL_INFO)
4186 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
4187
4188 dev->stats.tx_errors++;
4189 dev->stats.tx_aborted_errors++;
4190
4191 spin_lock_irqsave(&info->lock,flags);
4192 tx_stop(info);
4193 spin_unlock_irqrestore(&info->lock,flags);
4194
4195 netif_wake_queue(dev);
4196 }
4197
4198 /**
4199 * called by device driver when transmit completes
4200 * reenable network layer transmit if stopped
4201 *
4202 * info pointer to device instance information
4203 */
hdlcdev_tx_done(MGSLPC_INFO * info)4204 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4205 {
4206 if (netif_queue_stopped(info->netdev))
4207 netif_wake_queue(info->netdev);
4208 }
4209
4210 /**
4211 * called by device driver when frame received
4212 * pass frame to network layer
4213 *
4214 * info pointer to device instance information
4215 * buf pointer to buffer contianing frame data
4216 * size count of data bytes in buf
4217 */
hdlcdev_rx(MGSLPC_INFO * info,char * buf,int size)4218 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4219 {
4220 struct sk_buff *skb = dev_alloc_skb(size);
4221 struct net_device *dev = info->netdev;
4222
4223 if (debug_level >= DEBUG_LEVEL_INFO)
4224 printk("hdlcdev_rx(%s)\n",dev->name);
4225
4226 if (skb == NULL) {
4227 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4228 dev->stats.rx_dropped++;
4229 return;
4230 }
4231
4232 memcpy(skb_put(skb, size), buf, size);
4233
4234 skb->protocol = hdlc_type_trans(skb, dev);
4235
4236 dev->stats.rx_packets++;
4237 dev->stats.rx_bytes += size;
4238
4239 netif_rx(skb);
4240 }
4241
4242 static const struct net_device_ops hdlcdev_ops = {
4243 .ndo_open = hdlcdev_open,
4244 .ndo_stop = hdlcdev_close,
4245 .ndo_change_mtu = hdlc_change_mtu,
4246 .ndo_start_xmit = hdlc_start_xmit,
4247 .ndo_do_ioctl = hdlcdev_ioctl,
4248 .ndo_tx_timeout = hdlcdev_tx_timeout,
4249 };
4250
4251 /**
4252 * called by device driver when adding device instance
4253 * do generic HDLC initialization
4254 *
4255 * info pointer to device instance information
4256 *
4257 * returns 0 if success, otherwise error code
4258 */
hdlcdev_init(MGSLPC_INFO * info)4259 static int hdlcdev_init(MGSLPC_INFO *info)
4260 {
4261 int rc;
4262 struct net_device *dev;
4263 hdlc_device *hdlc;
4264
4265 /* allocate and initialize network and HDLC layer objects */
4266
4267 if (!(dev = alloc_hdlcdev(info))) {
4268 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
4269 return -ENOMEM;
4270 }
4271
4272 /* for network layer reporting purposes only */
4273 dev->base_addr = info->io_base;
4274 dev->irq = info->irq_level;
4275
4276 /* network layer callbacks and settings */
4277 dev->netdev_ops = &hdlcdev_ops;
4278 dev->watchdog_timeo = 10 * HZ;
4279 dev->tx_queue_len = 50;
4280
4281 /* generic HDLC layer callbacks and settings */
4282 hdlc = dev_to_hdlc(dev);
4283 hdlc->attach = hdlcdev_attach;
4284 hdlc->xmit = hdlcdev_xmit;
4285
4286 /* register objects with HDLC layer */
4287 if ((rc = register_hdlc_device(dev))) {
4288 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
4289 free_netdev(dev);
4290 return rc;
4291 }
4292
4293 info->netdev = dev;
4294 return 0;
4295 }
4296
4297 /**
4298 * called by device driver when removing device instance
4299 * do generic HDLC cleanup
4300 *
4301 * info pointer to device instance information
4302 */
hdlcdev_exit(MGSLPC_INFO * info)4303 static void hdlcdev_exit(MGSLPC_INFO *info)
4304 {
4305 unregister_hdlc_device(info->netdev);
4306 free_netdev(info->netdev);
4307 info->netdev = NULL;
4308 }
4309
4310 #endif /* CONFIG_HDLC */
4311
4312