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tty: The big operations rework
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1 /*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License
4 * as published by the Free Software Foundation; either version
5 * 2 of the License, or (at your option) any later version.
6 *
7 * Original driver code supplied by Multi-Tech
8 *
9 * Changes
10 * 1/9/98 alan@redhat.com Merge to 2.0.x kernel tree
11 * Obtain and use official major/minors
12 * Loader switched to a misc device
13 * (fixed range check bug as a side effect)
14 * Printk clean up
15 * 9/12/98 alan@redhat.com Rough port to 2.1.x
16 *
17 * 10/6/99 sameer Merged the ISA and PCI drivers to
18 * a new unified driver.
19 *
20 * 3/9/99 sameer Added support for ISI4616 cards.
21 *
22 * 16/9/99 sameer We do not force RTS low anymore.
23 * This is to prevent the firmware
24 * from getting confused.
25 *
26 * 26/10/99 sameer Cosmetic changes:The driver now
27 * dumps the Port Count information
28 * along with I/O address and IRQ.
29 *
30 * 13/12/99 sameer Fixed the problem with IRQ sharing.
31 *
32 * 10/5/00 sameer Fixed isicom_shutdown_board()
33 * to not lower DTR on all the ports
34 * when the last port on the card is
35 * closed.
36 *
37 * 10/5/00 sameer Signal mask setup command added
38 * to isicom_setup_port and
39 * isicom_shutdown_port.
40 *
41 * 24/5/00 sameer The driver is now SMP aware.
42 *
43 *
44 * 27/11/00 Vinayak P Risbud Fixed the Driver Crash Problem
45 *
46 *
47 * 03/01/01 anil .s Added support for resetting the
48 * internal modems on ISI cards.
49 *
50 * 08/02/01 anil .s Upgraded the driver for kernel
51 * 2.4.x
52 *
53 * 11/04/01 Kevin Fixed firmware load problem with
54 * ISIHP-4X card
55 *
56 * 30/04/01 anil .s Fixed the remote login through
57 * ISI port problem. Now the link
58 * does not go down before password
59 * prompt.
60 *
61 * 03/05/01 anil .s Fixed the problem with IRQ sharing
62 * among ISI-PCI cards.
63 *
64 * 03/05/01 anil .s Added support to display the version
65 * info during insmod as well as module
66 * listing by lsmod.
67 *
68 * 10/05/01 anil .s Done the modifications to the source
69 * file and Install script so that the
70 * same installation can be used for
71 * 2.2.x and 2.4.x kernel.
72 *
73 * 06/06/01 anil .s Now we drop both dtr and rts during
74 * shutdown_port as well as raise them
75 * during isicom_config_port.
76 *
77 * 09/06/01 acme@conectiva.com.br use capable, not suser, do
78 * restore_flags on failure in
79 * isicom_send_break, verify put_user
80 * result
81 *
82 * 11/02/03 ranjeeth Added support for 230 Kbps and 460 Kbps
83 * Baud index extended to 21
84 *
85 * 20/03/03 ranjeeth Made to work for Linux Advanced server.
86 * Taken care of license warning.
87 *
88 * 10/12/03 Ravindra Made to work for Fedora Core 1 of
89 * Red Hat Distribution
90 *
91 * 06/01/05 Alan Cox Merged the ISI and base kernel strands
92 * into a single 2.6 driver
93 *
94 * ***********************************************************
95 *
96 * To use this driver you also need the support package. You
97 * can find this in RPM format on
98 * ftp://ftp.linux.org.uk/pub/linux/alan
99 *
100 * You can find the original tools for this direct from Multitech
101 * ftp://ftp.multitech.com/ISI-Cards/
102 *
103 * Having installed the cards the module options (/etc/modprobe.conf)
104 *
105 * options isicom io=card1,card2,card3,card4 irq=card1,card2,card3,card4
106 *
107 * Omit those entries for boards you don't have installed.
108 *
109 * TODO
110 * Merge testing
111 * 64-bit verification
112 */
113
114 #include <linux/module.h>
115 #include <linux/firmware.h>
116 #include <linux/kernel.h>
117 #include <linux/tty.h>
118 #include <linux/tty_flip.h>
119 #include <linux/termios.h>
120 #include <linux/fs.h>
121 #include <linux/sched.h>
122 #include <linux/serial.h>
123 #include <linux/mm.h>
124 #include <linux/interrupt.h>
125 #include <linux/timer.h>
126 #include <linux/delay.h>
127 #include <linux/ioport.h>
128
129 #include <linux/uaccess.h>
130 #include <linux/io.h>
131 #include <asm/system.h>
132
133 #include <linux/pci.h>
134
135 #include <linux/isicom.h>
136
137 #define InterruptTheCard(base) outw(0, (base) + 0xc)
138 #define ClearInterrupt(base) inw((base) + 0x0a)
139
140 #define pr_dbg(str...) pr_debug("ISICOM: " str)
141 #ifdef DEBUG
142 #define isicom_paranoia_check(a, b, c) __isicom_paranoia_check((a), (b), (c))
143 #else
144 #define isicom_paranoia_check(a, b, c) 0
145 #endif
146
147 static int isicom_probe(struct pci_dev *, const struct pci_device_id *);
148 static void __devexit isicom_remove(struct pci_dev *);
149
150 static struct pci_device_id isicom_pci_tbl[] = {
151 { PCI_DEVICE(VENDOR_ID, 0x2028) },
152 { PCI_DEVICE(VENDOR_ID, 0x2051) },
153 { PCI_DEVICE(VENDOR_ID, 0x2052) },
154 { PCI_DEVICE(VENDOR_ID, 0x2053) },
155 { PCI_DEVICE(VENDOR_ID, 0x2054) },
156 { PCI_DEVICE(VENDOR_ID, 0x2055) },
157 { PCI_DEVICE(VENDOR_ID, 0x2056) },
158 { PCI_DEVICE(VENDOR_ID, 0x2057) },
159 { PCI_DEVICE(VENDOR_ID, 0x2058) },
160 { 0 }
161 };
162 MODULE_DEVICE_TABLE(pci, isicom_pci_tbl);
163
164 static struct pci_driver isicom_driver = {
165 .name = "isicom",
166 .id_table = isicom_pci_tbl,
167 .probe = isicom_probe,
168 .remove = __devexit_p(isicom_remove)
169 };
170
171 static int prev_card = 3; /* start servicing isi_card[0] */
172 static struct tty_driver *isicom_normal;
173
174 static void isicom_tx(unsigned long _data);
175 static void isicom_start(struct tty_struct *tty);
176
177 static DEFINE_TIMER(tx, isicom_tx, 0, 0);
178
179 /* baud index mappings from linux defns to isi */
180
181 static signed char linuxb_to_isib[] = {
182 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 16, 17, 18, 19, 20, 21
183 };
184
185 struct isi_board {
186 unsigned long base;
187 int irq;
188 unsigned char port_count;
189 unsigned short status;
190 unsigned short port_status; /* each bit for each port */
191 unsigned short shift_count;
192 struct isi_port *ports;
193 signed char count;
194 spinlock_t card_lock; /* Card wide lock 11/5/00 -sameer */
195 unsigned long flags;
196 unsigned int index;
197 };
198
199 struct isi_port {
200 unsigned short magic;
201 unsigned int flags;
202 int count;
203 int blocked_open;
204 int close_delay;
205 u16 channel;
206 u16 status;
207 u16 closing_wait;
208 struct isi_board *card;
209 struct tty_struct *tty;
210 wait_queue_head_t close_wait;
211 wait_queue_head_t open_wait;
212 unsigned char *xmit_buf;
213 int xmit_head;
214 int xmit_tail;
215 int xmit_cnt;
216 };
217
218 static struct isi_board isi_card[BOARD_COUNT];
219 static struct isi_port isi_ports[PORT_COUNT];
220
221 /*
222 * Locking functions for card level locking. We need to own both
223 * the kernel lock for the card and have the card in a position that
224 * it wants to talk.
225 */
226
227 static inline int WaitTillCardIsFree(unsigned long base)
228 {
229 unsigned int count = 0;
230 unsigned int a = in_atomic(); /* do we run under spinlock? */
231
232 while (!(inw(base + 0xe) & 0x1) && count++ < 100)
233 if (a)
234 mdelay(1);
235 else
236 msleep(1);
237
238 return !(inw(base + 0xe) & 0x1);
239 }
240
241 static int lock_card(struct isi_board *card)
242 {
243 unsigned long base = card->base;
244 unsigned int retries, a;
245
246 for (retries = 0; retries < 10; retries++) {
247 spin_lock_irqsave(&card->card_lock, card->flags);
248 for (a = 0; a < 10; a++) {
249 if (inw(base + 0xe) & 0x1)
250 return 1;
251 udelay(10);
252 }
253 spin_unlock_irqrestore(&card->card_lock, card->flags);
254 msleep(10);
255 }
256 printk(KERN_WARNING "ISICOM: Failed to lock Card (0x%lx)\n",
257 card->base);
258
259 return 0; /* Failed to acquire the card! */
260 }
261
262 static void unlock_card(struct isi_board *card)
263 {
264 spin_unlock_irqrestore(&card->card_lock, card->flags);
265 }
266
267 /*
268 * ISI Card specific ops ...
269 */
270
271 /* card->lock HAS to be held */
272 static void raise_dtr(struct isi_port *port)
273 {
274 struct isi_board *card = port->card;
275 unsigned long base = card->base;
276 u16 channel = port->channel;
277
278 if (WaitTillCardIsFree(base))
279 return;
280
281 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
282 outw(0x0504, base);
283 InterruptTheCard(base);
284 port->status |= ISI_DTR;
285 }
286
287 /* card->lock HAS to be held */
288 static inline void drop_dtr(struct isi_port *port)
289 {
290 struct isi_board *card = port->card;
291 unsigned long base = card->base;
292 u16 channel = port->channel;
293
294 if (WaitTillCardIsFree(base))
295 return;
296
297 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
298 outw(0x0404, base);
299 InterruptTheCard(base);
300 port->status &= ~ISI_DTR;
301 }
302
303 /* card->lock HAS to be held */
304 static inline void raise_rts(struct isi_port *port)
305 {
306 struct isi_board *card = port->card;
307 unsigned long base = card->base;
308 u16 channel = port->channel;
309
310 if (WaitTillCardIsFree(base))
311 return;
312
313 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
314 outw(0x0a04, base);
315 InterruptTheCard(base);
316 port->status |= ISI_RTS;
317 }
318
319 /* card->lock HAS to be held */
320 static inline void drop_rts(struct isi_port *port)
321 {
322 struct isi_board *card = port->card;
323 unsigned long base = card->base;
324 u16 channel = port->channel;
325
326 if (WaitTillCardIsFree(base))
327 return;
328
329 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
330 outw(0x0804, base);
331 InterruptTheCard(base);
332 port->status &= ~ISI_RTS;
333 }
334
335 /* card->lock MUST NOT be held */
336 static inline void raise_dtr_rts(struct isi_port *port)
337 {
338 struct isi_board *card = port->card;
339 unsigned long base = card->base;
340 u16 channel = port->channel;
341
342 if (!lock_card(card))
343 return;
344
345 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
346 outw(0x0f04, base);
347 InterruptTheCard(base);
348 port->status |= (ISI_DTR | ISI_RTS);
349 unlock_card(card);
350 }
351
352 /* card->lock HAS to be held */
353 static void drop_dtr_rts(struct isi_port *port)
354 {
355 struct isi_board *card = port->card;
356 unsigned long base = card->base;
357 u16 channel = port->channel;
358
359 if (WaitTillCardIsFree(base))
360 return;
361
362 outw(0x8000 | (channel << card->shift_count) | 0x02, base);
363 outw(0x0c04, base);
364 InterruptTheCard(base);
365 port->status &= ~(ISI_RTS | ISI_DTR);
366 }
367
368 /*
369 * ISICOM Driver specific routines ...
370 *
371 */
372
373 static inline int __isicom_paranoia_check(struct isi_port const *port,
374 char *name, const char *routine)
375 {
376 if (!port) {
377 printk(KERN_WARNING "ISICOM: Warning: bad isicom magic for "
378 "dev %s in %s.\n", name, routine);
379 return 1;
380 }
381 if (port->magic != ISICOM_MAGIC) {
382 printk(KERN_WARNING "ISICOM: Warning: NULL isicom port for "
383 "dev %s in %s.\n", name, routine);
384 return 1;
385 }
386
387 return 0;
388 }
389
390 /*
391 * Transmitter.
392 *
393 * We shovel data into the card buffers on a regular basis. The card
394 * will do the rest of the work for us.
395 */
396
397 static void isicom_tx(unsigned long _data)
398 {
399 unsigned long flags, base;
400 unsigned int retries;
401 short count = (BOARD_COUNT-1), card;
402 short txcount, wrd, residue, word_count, cnt;
403 struct isi_port *port;
404 struct tty_struct *tty;
405
406 /* find next active board */
407 card = (prev_card + 1) & 0x0003;
408 while (count-- > 0) {
409 if (isi_card[card].status & BOARD_ACTIVE)
410 break;
411 card = (card + 1) & 0x0003;
412 }
413 if (!(isi_card[card].status & BOARD_ACTIVE))
414 goto sched_again;
415
416 prev_card = card;
417
418 count = isi_card[card].port_count;
419 port = isi_card[card].ports;
420 base = isi_card[card].base;
421
422 spin_lock_irqsave(&isi_card[card].card_lock, flags);
423 for (retries = 0; retries < 100; retries++) {
424 if (inw(base + 0xe) & 0x1)
425 break;
426 udelay(2);
427 }
428 if (retries >= 100)
429 goto unlock;
430
431 for (; count > 0; count--, port++) {
432 /* port not active or tx disabled to force flow control */
433 if (!(port->flags & ASYNC_INITIALIZED) ||
434 !(port->status & ISI_TXOK))
435 continue;
436
437 tty = port->tty;
438
439 if (tty == NULL)
440 continue;
441
442 txcount = min_t(short, TX_SIZE, port->xmit_cnt);
443 if (txcount <= 0 || tty->stopped || tty->hw_stopped)
444 continue;
445
446 if (!(inw(base + 0x02) & (1 << port->channel)))
447 continue;
448
449 pr_dbg("txing %d bytes, port%d.\n", txcount,
450 port->channel + 1);
451 outw((port->channel << isi_card[card].shift_count) | txcount,
452 base);
453 residue = NO;
454 wrd = 0;
455 while (1) {
456 cnt = min_t(int, txcount, (SERIAL_XMIT_SIZE
457 - port->xmit_tail));
458 if (residue == YES) {
459 residue = NO;
460 if (cnt > 0) {
461 wrd |= (port->xmit_buf[port->xmit_tail]
462 << 8);
463 port->xmit_tail = (port->xmit_tail + 1)
464 & (SERIAL_XMIT_SIZE - 1);
465 port->xmit_cnt--;
466 txcount--;
467 cnt--;
468 outw(wrd, base);
469 } else {
470 outw(wrd, base);
471 break;
472 }
473 }
474 if (cnt <= 0)
475 break;
476 word_count = cnt >> 1;
477 outsw(base, port->xmit_buf+port->xmit_tail, word_count);
478 port->xmit_tail = (port->xmit_tail
479 + (word_count << 1)) & (SERIAL_XMIT_SIZE - 1);
480 txcount -= (word_count << 1);
481 port->xmit_cnt -= (word_count << 1);
482 if (cnt & 0x0001) {
483 residue = YES;
484 wrd = port->xmit_buf[port->xmit_tail];
485 port->xmit_tail = (port->xmit_tail + 1)
486 & (SERIAL_XMIT_SIZE - 1);
487 port->xmit_cnt--;
488 txcount--;
489 }
490 }
491
492 InterruptTheCard(base);
493 if (port->xmit_cnt <= 0)
494 port->status &= ~ISI_TXOK;
495 if (port->xmit_cnt <= WAKEUP_CHARS)
496 tty_wakeup(tty);
497 }
498
499 unlock:
500 spin_unlock_irqrestore(&isi_card[card].card_lock, flags);
501 /* schedule another tx for hopefully in about 10ms */
502 sched_again:
503 mod_timer(&tx, jiffies + msecs_to_jiffies(10));
504 }
505
506 /*
507 * Main interrupt handler routine
508 */
509
510 static irqreturn_t isicom_interrupt(int irq, void *dev_id)
511 {
512 struct isi_board *card = dev_id;
513 struct isi_port *port;
514 struct tty_struct *tty;
515 unsigned long base;
516 u16 header, word_count, count, channel;
517 short byte_count;
518 unsigned char *rp;
519
520 if (!card || !(card->status & FIRMWARE_LOADED))
521 return IRQ_NONE;
522
523 base = card->base;
524
525 /* did the card interrupt us? */
526 if (!(inw(base + 0x0e) & 0x02))
527 return IRQ_NONE;
528
529 spin_lock(&card->card_lock);
530
531 /*
532 * disable any interrupts from the PCI card and lower the
533 * interrupt line
534 */
535 outw(0x8000, base+0x04);
536 ClearInterrupt(base);
537
538 inw(base); /* get the dummy word out */
539 header = inw(base);
540 channel = (header & 0x7800) >> card->shift_count;
541 byte_count = header & 0xff;
542
543 if (channel + 1 > card->port_count) {
544 printk(KERN_WARNING "ISICOM: isicom_interrupt(0x%lx): "
545 "%d(channel) > port_count.\n", base, channel+1);
546 outw(0x0000, base+0x04); /* enable interrupts */
547 spin_unlock(&card->card_lock);
548 return IRQ_HANDLED;
549 }
550 port = card->ports + channel;
551 if (!(port->flags & ASYNC_INITIALIZED)) {
552 outw(0x0000, base+0x04); /* enable interrupts */
553 spin_unlock(&card->card_lock);
554 return IRQ_HANDLED;
555 }
556
557 tty = port->tty;
558 if (tty == NULL) {
559 word_count = byte_count >> 1;
560 while (byte_count > 1) {
561 inw(base);
562 byte_count -= 2;
563 }
564 if (byte_count & 0x01)
565 inw(base);
566 outw(0x0000, base+0x04); /* enable interrupts */
567 spin_unlock(&card->card_lock);
568 return IRQ_HANDLED;
569 }
570
571 if (header & 0x8000) { /* Status Packet */
572 header = inw(base);
573 switch (header & 0xff) {
574 case 0: /* Change in EIA signals */
575 if (port->flags & ASYNC_CHECK_CD) {
576 if (port->status & ISI_DCD) {
577 if (!(header & ISI_DCD)) {
578 /* Carrier has been lost */
579 pr_dbg("interrupt: DCD->low.\n"
580 );
581 port->status &= ~ISI_DCD;
582 tty_hangup(tty);
583 }
584 } else if (header & ISI_DCD) {
585 /* Carrier has been detected */
586 pr_dbg("interrupt: DCD->high.\n");
587 port->status |= ISI_DCD;
588 wake_up_interruptible(&port->open_wait);
589 }
590 } else {
591 if (header & ISI_DCD)
592 port->status |= ISI_DCD;
593 else
594 port->status &= ~ISI_DCD;
595 }
596
597 if (port->flags & ASYNC_CTS_FLOW) {
598 if (port->tty->hw_stopped) {
599 if (header & ISI_CTS) {
600 port->tty->hw_stopped = 0;
601 /* start tx ing */
602 port->status |= (ISI_TXOK
603 | ISI_CTS);
604 tty_wakeup(tty);
605 }
606 } else if (!(header & ISI_CTS)) {
607 port->tty->hw_stopped = 1;
608 /* stop tx ing */
609 port->status &= ~(ISI_TXOK | ISI_CTS);
610 }
611 } else {
612 if (header & ISI_CTS)
613 port->status |= ISI_CTS;
614 else
615 port->status &= ~ISI_CTS;
616 }
617
618 if (header & ISI_DSR)
619 port->status |= ISI_DSR;
620 else
621 port->status &= ~ISI_DSR;
622
623 if (header & ISI_RI)
624 port->status |= ISI_RI;
625 else
626 port->status &= ~ISI_RI;
627
628 break;
629
630 case 1: /* Received Break !!! */
631 tty_insert_flip_char(tty, 0, TTY_BREAK);
632 if (port->flags & ASYNC_SAK)
633 do_SAK(tty);
634 tty_flip_buffer_push(tty);
635 break;
636
637 case 2: /* Statistics */
638 pr_dbg("isicom_interrupt: stats!!!.\n");
639 break;
640
641 default:
642 pr_dbg("Intr: Unknown code in status packet.\n");
643 break;
644 }
645 } else { /* Data Packet */
646
647 count = tty_prepare_flip_string(tty, &rp, byte_count & ~1);
648 pr_dbg("Intr: Can rx %d of %d bytes.\n", count, byte_count);
649 word_count = count >> 1;
650 insw(base, rp, word_count);
651 byte_count -= (word_count << 1);
652 if (count & 0x0001) {
653 tty_insert_flip_char(tty, inw(base) & 0xff,
654 TTY_NORMAL);
655 byte_count -= 2;
656 }
657 if (byte_count > 0) {
658 pr_dbg("Intr(0x%lx:%d): Flip buffer overflow! dropping "
659 "bytes...\n", base, channel + 1);
660 /* drain out unread xtra data */
661 while (byte_count > 0) {
662 inw(base);
663 byte_count -= 2;
664 }
665 }
666 tty_flip_buffer_push(tty);
667 }
668 outw(0x0000, base+0x04); /* enable interrupts */
669 spin_unlock(&card->card_lock);
670
671 return IRQ_HANDLED;
672 }
673
674 static void isicom_config_port(struct isi_port *port)
675 {
676 struct isi_board *card = port->card;
677 struct tty_struct *tty;
678 unsigned long baud;
679 unsigned long base = card->base;
680 u16 channel_setup, channel = port->channel,
681 shift_count = card->shift_count;
682 unsigned char flow_ctrl;
683
684 tty = port->tty;
685
686 if (tty == NULL)
687 return;
688 /* FIXME: Switch to new tty baud API */
689 baud = C_BAUD(tty);
690 if (baud & CBAUDEX) {
691 baud &= ~CBAUDEX;
692
693 /* if CBAUDEX bit is on and the baud is set to either 50 or 75
694 * then the card is programmed for 57.6Kbps or 115Kbps
695 * respectively.
696 */
697
698 /* 1,2,3,4 => 57.6, 115.2, 230, 460 kbps resp. */
699 if (baud < 1 || baud > 4)
700 port->tty->termios->c_cflag &= ~CBAUDEX;
701 else
702 baud += 15;
703 }
704 if (baud == 15) {
705
706 /* the ASYNC_SPD_HI and ASYNC_SPD_VHI options are set
707 * by the set_serial_info ioctl ... this is done by
708 * the 'setserial' utility.
709 */
710
711 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
712 baud++; /* 57.6 Kbps */
713 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
714 baud += 2; /* 115 Kbps */
715 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
716 baud += 3; /* 230 kbps*/
717 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
718 baud += 4; /* 460 kbps*/
719 }
720 if (linuxb_to_isib[baud] == -1) {
721 /* hang up */
722 drop_dtr(port);
723 return;
724 } else
725 raise_dtr(port);
726
727 if (WaitTillCardIsFree(base) == 0) {
728 outw(0x8000 | (channel << shift_count) | 0x03, base);
729 outw(linuxb_to_isib[baud] << 8 | 0x03, base);
730 channel_setup = 0;
731 switch (C_CSIZE(tty)) {
732 case CS5:
733 channel_setup |= ISICOM_CS5;
734 break;
735 case CS6:
736 channel_setup |= ISICOM_CS6;
737 break;
738 case CS7:
739 channel_setup |= ISICOM_CS7;
740 break;
741 case CS8:
742 channel_setup |= ISICOM_CS8;
743 break;
744 }
745
746 if (C_CSTOPB(tty))
747 channel_setup |= ISICOM_2SB;
748 if (C_PARENB(tty)) {
749 channel_setup |= ISICOM_EVPAR;
750 if (C_PARODD(tty))
751 channel_setup |= ISICOM_ODPAR;
752 }
753 outw(channel_setup, base);
754 InterruptTheCard(base);
755 }
756 if (C_CLOCAL(tty))
757 port->flags &= ~ASYNC_CHECK_CD;
758 else
759 port->flags |= ASYNC_CHECK_CD;
760
761 /* flow control settings ...*/
762 flow_ctrl = 0;
763 port->flags &= ~ASYNC_CTS_FLOW;
764 if (C_CRTSCTS(tty)) {
765 port->flags |= ASYNC_CTS_FLOW;
766 flow_ctrl |= ISICOM_CTSRTS;
767 }
768 if (I_IXON(tty))
769 flow_ctrl |= ISICOM_RESPOND_XONXOFF;
770 if (I_IXOFF(tty))
771 flow_ctrl |= ISICOM_INITIATE_XONXOFF;
772
773 if (WaitTillCardIsFree(base) == 0) {
774 outw(0x8000 | (channel << shift_count) | 0x04, base);
775 outw(flow_ctrl << 8 | 0x05, base);
776 outw((STOP_CHAR(tty)) << 8 | (START_CHAR(tty)), base);
777 InterruptTheCard(base);
778 }
779
780 /* rx enabled -> enable port for rx on the card */
781 if (C_CREAD(tty)) {
782 card->port_status |= (1 << channel);
783 outw(card->port_status, base + 0x02);
784 }
785 }
786
787 /* open et all */
788
789 static inline void isicom_setup_board(struct isi_board *bp)
790 {
791 int channel;
792 struct isi_port *port;
793 unsigned long flags;
794
795 spin_lock_irqsave(&bp->card_lock, flags);
796 if (bp->status & BOARD_ACTIVE) {
797 spin_unlock_irqrestore(&bp->card_lock, flags);
798 return;
799 }
800 port = bp->ports;
801 bp->status |= BOARD_ACTIVE;
802 for (channel = 0; channel < bp->port_count; channel++, port++)
803 drop_dtr_rts(port);
804 spin_unlock_irqrestore(&bp->card_lock, flags);
805 }
806
807 static int isicom_setup_port(struct isi_port *port)
808 {
809 struct isi_board *card = port->card;
810 unsigned long flags;
811
812 if (port->flags & ASYNC_INITIALIZED)
813 return 0;
814 if (!port->xmit_buf) {
815 /* Relies on BKL */
816 void *xmit_buf = (void *)get_zeroed_page(GFP_KERNEL);
817
818 if (xmit_buf == NULL)
819 return -ENOMEM;
820 if (port->xmit_buf) {
821 free_page((unsigned long)xmit_buf);
822 return -ERESTARTSYS;
823 }
824 port->xmit_buf = xmit_buf;
825 }
826
827 spin_lock_irqsave(&card->card_lock, flags);
828 if (port->tty)
829 clear_bit(TTY_IO_ERROR, &port->tty->flags);
830 if (port->count == 1)
831 card->count++;
832
833 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
834
835 /* discard any residual data */
836 if (WaitTillCardIsFree(card->base) == 0) {
837 outw(0x8000 | (port->channel << card->shift_count) | 0x02,
838 card->base);
839 outw(((ISICOM_KILLTX | ISICOM_KILLRX) << 8) | 0x06, card->base);
840 InterruptTheCard(card->base);
841 }
842
843 isicom_config_port(port);
844 port->flags |= ASYNC_INITIALIZED;
845 spin_unlock_irqrestore(&card->card_lock, flags);
846
847 return 0;
848 }
849
850 static int block_til_ready(struct tty_struct *tty, struct file *filp,
851 struct isi_port *port)
852 {
853 struct isi_board *card = port->card;
854 int do_clocal = 0, retval;
855 unsigned long flags;
856 DECLARE_WAITQUEUE(wait, current);
857
858 /* block if port is in the process of being closed */
859
860 if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
861 pr_dbg("block_til_ready: close in progress.\n");
862 interruptible_sleep_on(&port->close_wait);
863 if (port->flags & ASYNC_HUP_NOTIFY)
864 return -EAGAIN;
865 else
866 return -ERESTARTSYS;
867 }
868
869 /* if non-blocking mode is set ... */
870
871 if ((filp->f_flags & O_NONBLOCK) ||
872 (tty->flags & (1 << TTY_IO_ERROR))) {
873 pr_dbg("block_til_ready: non-block mode.\n");
874 port->flags |= ASYNC_NORMAL_ACTIVE;
875 return 0;
876 }
877
878 if (C_CLOCAL(tty))
879 do_clocal = 1;
880
881 /* block waiting for DCD to be asserted, and while
882 callout dev is busy */
883 retval = 0;
884 add_wait_queue(&port->open_wait, &wait);
885
886 spin_lock_irqsave(&card->card_lock, flags);
887 if (!tty_hung_up_p(filp))
888 port->count--;
889 port->blocked_open++;
890 spin_unlock_irqrestore(&card->card_lock, flags);
891
892 while (1) {
893 raise_dtr_rts(port);
894
895 set_current_state(TASK_INTERRUPTIBLE);
896 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
897 if (port->flags & ASYNC_HUP_NOTIFY)
898 retval = -EAGAIN;
899 else
900 retval = -ERESTARTSYS;
901 break;
902 }
903 if (!(port->flags & ASYNC_CLOSING) &&
904 (do_clocal || (port->status & ISI_DCD))) {
905 break;
906 }
907 if (signal_pending(current)) {
908 retval = -ERESTARTSYS;
909 break;
910 }
911 schedule();
912 }
913 set_current_state(TASK_RUNNING);
914 remove_wait_queue(&port->open_wait, &wait);
915 spin_lock_irqsave(&card->card_lock, flags);
916 if (!tty_hung_up_p(filp))
917 port->count++;
918 port->blocked_open--;
919 spin_unlock_irqrestore(&card->card_lock, flags);
920 if (retval)
921 return retval;
922 port->flags |= ASYNC_NORMAL_ACTIVE;
923 return 0;
924 }
925
926 static int isicom_open(struct tty_struct *tty, struct file *filp)
927 {
928 struct isi_port *port;
929 struct isi_board *card;
930 unsigned int board;
931 int error, line;
932
933 line = tty->index;
934 if (line < 0 || line > PORT_COUNT-1)
935 return -ENODEV;
936 board = BOARD(line);
937 card = &isi_card[board];
938
939 if (!(card->status & FIRMWARE_LOADED))
940 return -ENODEV;
941
942 /* open on a port greater than the port count for the card !!! */
943 if (line > ((board * 16) + card->port_count - 1))
944 return -ENODEV;
945
946 port = &isi_ports[line];
947 if (isicom_paranoia_check(port, tty->name, "isicom_open"))
948 return -ENODEV;
949
950 isicom_setup_board(card);
951
952 port->count++;
953 tty->driver_data = port;
954 port->tty = tty;
955 error = isicom_setup_port(port);
956 if (error == 0)
957 error = block_til_ready(tty, filp, port);
958 return error;
959 }
960
961 /* close et all */
962
963 static inline void isicom_shutdown_board(struct isi_board *bp)
964 {
965 if (bp->status & BOARD_ACTIVE)
966 bp->status &= ~BOARD_ACTIVE;
967 }
968
969 /* card->lock HAS to be held */
970 static void isicom_shutdown_port(struct isi_port *port)
971 {
972 struct isi_board *card = port->card;
973 struct tty_struct *tty;
974
975 tty = port->tty;
976
977 if (!(port->flags & ASYNC_INITIALIZED))
978 return;
979
980 if (port->xmit_buf) {
981 free_page((unsigned long) port->xmit_buf);
982 port->xmit_buf = NULL;
983 }
984 port->flags &= ~ASYNC_INITIALIZED;
985 /* 3rd October 2000 : Vinayak P Risbud */
986 port->tty = NULL;
987
988 /*Fix done by Anil .S on 30-04-2001
989 remote login through isi port has dtr toggle problem
990 due to which the carrier drops before the password prompt
991 appears on the remote end. Now we drop the dtr only if the
992 HUPCL(Hangup on close) flag is set for the tty*/
993
994 if (C_HUPCL(tty))
995 /* drop dtr on this port */
996 drop_dtr(port);
997
998 /* any other port uninits */
999 if (tty)
1000 set_bit(TTY_IO_ERROR, &tty->flags);
1001
1002 if (--card->count < 0) {
1003 pr_dbg("isicom_shutdown_port: bad board(0x%lx) count %d.\n",
1004 card->base, card->count);
1005 card->count = 0;
1006 }
1007
1008 /* last port was closed, shutdown that boad too */
1009 if (C_HUPCL(tty)) {
1010 if (!card->count)
1011 isicom_shutdown_board(card);
1012 }
1013 }
1014
1015 static void isicom_flush_buffer(struct tty_struct *tty)
1016 {
1017 struct isi_port *port = tty->driver_data;
1018 struct isi_board *card = port->card;
1019 unsigned long flags;
1020
1021 if (isicom_paranoia_check(port, tty->name, "isicom_flush_buffer"))
1022 return;
1023
1024 spin_lock_irqsave(&card->card_lock, flags);
1025 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
1026 spin_unlock_irqrestore(&card->card_lock, flags);
1027
1028 tty_wakeup(tty);
1029 }
1030
1031 static void isicom_close(struct tty_struct *tty, struct file *filp)
1032 {
1033 struct isi_port *port = tty->driver_data;
1034 struct isi_board *card;
1035 unsigned long flags;
1036
1037 if (!port)
1038 return;
1039 card = port->card;
1040 if (isicom_paranoia_check(port, tty->name, "isicom_close"))
1041 return;
1042
1043 pr_dbg("Close start!!!.\n");
1044
1045 spin_lock_irqsave(&card->card_lock, flags);
1046 if (tty_hung_up_p(filp)) {
1047 spin_unlock_irqrestore(&card->card_lock, flags);
1048 return;
1049 }
1050
1051 if (tty->count == 1 && port->count != 1) {
1052 printk(KERN_WARNING "ISICOM:(0x%lx) isicom_close: bad port "
1053 "count tty->count = 1 port count = %d.\n",
1054 card->base, port->count);
1055 port->count = 1;
1056 }
1057 if (--port->count < 0) {
1058 printk(KERN_WARNING "ISICOM:(0x%lx) isicom_close: bad port "
1059 "count for channel%d = %d", card->base, port->channel,
1060 port->count);
1061 port->count = 0;
1062 }
1063
1064 if (port->count) {
1065 spin_unlock_irqrestore(&card->card_lock, flags);
1066 return;
1067 }
1068 port->flags |= ASYNC_CLOSING;
1069 tty->closing = 1;
1070 spin_unlock_irqrestore(&card->card_lock, flags);
1071
1072 if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1073 tty_wait_until_sent(tty, port->closing_wait);
1074 /* indicate to the card that no more data can be received
1075 on this port */
1076 spin_lock_irqsave(&card->card_lock, flags);
1077 if (port->flags & ASYNC_INITIALIZED) {
1078 card->port_status &= ~(1 << port->channel);
1079 outw(card->port_status, card->base + 0x02);
1080 }
1081 isicom_shutdown_port(port);
1082 spin_unlock_irqrestore(&card->card_lock, flags);
1083
1084 isicom_flush_buffer(tty);
1085 tty_ldisc_flush(tty);
1086
1087 spin_lock_irqsave(&card->card_lock, flags);
1088 tty->closing = 0;
1089
1090 if (port->blocked_open) {
1091 spin_unlock_irqrestore(&card->card_lock, flags);
1092 if (port->close_delay) {
1093 pr_dbg("scheduling until time out.\n");
1094 msleep_interruptible(
1095 jiffies_to_msecs(port->close_delay));
1096 }
1097 spin_lock_irqsave(&card->card_lock, flags);
1098 wake_up_interruptible(&port->open_wait);
1099 }
1100 port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1101 wake_up_interruptible(&port->close_wait);
1102 spin_unlock_irqrestore(&card->card_lock, flags);
1103 }
1104
1105 /* write et all */
1106 static int isicom_write(struct tty_struct *tty, const unsigned char *buf,
1107 int count)
1108 {
1109 struct isi_port *port = tty->driver_data;
1110 struct isi_board *card = port->card;
1111 unsigned long flags;
1112 int cnt, total = 0;
1113
1114 if (isicom_paranoia_check(port, tty->name, "isicom_write"))
1115 return 0;
1116
1117 if (!port->xmit_buf)
1118 return 0;
1119
1120 spin_lock_irqsave(&card->card_lock, flags);
1121
1122 while (1) {
1123 cnt = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt
1124 - 1, SERIAL_XMIT_SIZE - port->xmit_head));
1125 if (cnt <= 0)
1126 break;
1127
1128 memcpy(port->xmit_buf + port->xmit_head, buf, cnt);
1129 port->xmit_head = (port->xmit_head + cnt) & (SERIAL_XMIT_SIZE
1130 - 1);
1131 port->xmit_cnt += cnt;
1132 buf += cnt;
1133 count -= cnt;
1134 total += cnt;
1135 }
1136 if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped)
1137 port->status |= ISI_TXOK;
1138 spin_unlock_irqrestore(&card->card_lock, flags);
1139 return total;
1140 }
1141
1142 /* put_char et all */
1143 static int isicom_put_char(struct tty_struct *tty, unsigned char ch)
1144 {
1145 struct isi_port *port = tty->driver_data;
1146 struct isi_board *card = port->card;
1147 unsigned long flags;
1148
1149 if (isicom_paranoia_check(port, tty->name, "isicom_put_char"))
1150 return 0;
1151
1152 if (!port->xmit_buf)
1153 return 0;
1154
1155 spin_lock_irqsave(&card->card_lock, flags);
1156 if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
1157 spin_unlock_irqrestore(&card->card_lock, flags);
1158 return 0;
1159 }
1160
1161 port->xmit_buf[port->xmit_head++] = ch;
1162 port->xmit_head &= (SERIAL_XMIT_SIZE - 1);
1163 port->xmit_cnt++;
1164 spin_unlock_irqrestore(&card->card_lock, flags);
1165 return 1;
1166 }
1167
1168 /* flush_chars et all */
1169 static void isicom_flush_chars(struct tty_struct *tty)
1170 {
1171 struct isi_port *port = tty->driver_data;
1172
1173 if (isicom_paranoia_check(port, tty->name, "isicom_flush_chars"))
1174 return;
1175
1176 if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
1177 !port->xmit_buf)
1178 return;
1179
1180 /* this tells the transmitter to consider this port for
1181 data output to the card ... that's the best we can do. */
1182 port->status |= ISI_TXOK;
1183 }
1184
1185 /* write_room et all */
1186 static int isicom_write_room(struct tty_struct *tty)
1187 {
1188 struct isi_port *port = tty->driver_data;
1189 int free;
1190
1191 if (isicom_paranoia_check(port, tty->name, "isicom_write_room"))
1192 return 0;
1193
1194 free = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
1195 if (free < 0)
1196 free = 0;
1197 return free;
1198 }
1199
1200 /* chars_in_buffer et all */
1201 static int isicom_chars_in_buffer(struct tty_struct *tty)
1202 {
1203 struct isi_port *port = tty->driver_data;
1204 if (isicom_paranoia_check(port, tty->name, "isicom_chars_in_buffer"))
1205 return 0;
1206 return port->xmit_cnt;
1207 }
1208
1209 /* ioctl et all */
1210 static inline void isicom_send_break(struct isi_port *port,
1211 unsigned long length)
1212 {
1213 struct isi_board *card = port->card;
1214 unsigned long base = card->base;
1215
1216 if (!lock_card(card))
1217 return;
1218
1219 outw(0x8000 | ((port->channel) << (card->shift_count)) | 0x3, base);
1220 outw((length & 0xff) << 8 | 0x00, base);
1221 outw((length & 0xff00), base);
1222 InterruptTheCard(base);
1223
1224 unlock_card(card);
1225 }
1226
1227 static int isicom_tiocmget(struct tty_struct *tty, struct file *file)
1228 {
1229 struct isi_port *port = tty->driver_data;
1230 /* just send the port status */
1231 u16 status = port->status;
1232
1233 if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
1234 return -ENODEV;
1235
1236 return ((status & ISI_RTS) ? TIOCM_RTS : 0) |
1237 ((status & ISI_DTR) ? TIOCM_DTR : 0) |
1238 ((status & ISI_DCD) ? TIOCM_CAR : 0) |
1239 ((status & ISI_DSR) ? TIOCM_DSR : 0) |
1240 ((status & ISI_CTS) ? TIOCM_CTS : 0) |
1241 ((status & ISI_RI ) ? TIOCM_RI : 0);
1242 }
1243
1244 static int isicom_tiocmset(struct tty_struct *tty, struct file *file,
1245 unsigned int set, unsigned int clear)
1246 {
1247 struct isi_port *port = tty->driver_data;
1248 unsigned long flags;
1249
1250 if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
1251 return -ENODEV;
1252
1253 spin_lock_irqsave(&port->card->card_lock, flags);
1254 if (set & TIOCM_RTS)
1255 raise_rts(port);
1256 if (set & TIOCM_DTR)
1257 raise_dtr(port);
1258
1259 if (clear & TIOCM_RTS)
1260 drop_rts(port);
1261 if (clear & TIOCM_DTR)
1262 drop_dtr(port);
1263 spin_unlock_irqrestore(&port->card->card_lock, flags);
1264
1265 return 0;
1266 }
1267
1268 static int isicom_set_serial_info(struct isi_port *port,
1269 struct serial_struct __user *info)
1270 {
1271 struct serial_struct newinfo;
1272 int reconfig_port;
1273
1274 if (copy_from_user(&newinfo, info, sizeof(newinfo)))
1275 return -EFAULT;
1276
1277 lock_kernel();
1278
1279 reconfig_port = ((port->flags & ASYNC_SPD_MASK) !=
1280 (newinfo.flags & ASYNC_SPD_MASK));
1281
1282 if (!capable(CAP_SYS_ADMIN)) {
1283 if ((newinfo.close_delay != port->close_delay) ||
1284 (newinfo.closing_wait != port->closing_wait) ||
1285 ((newinfo.flags & ~ASYNC_USR_MASK) !=
1286 (port->flags & ~ASYNC_USR_MASK))) {
1287 unlock_kernel();
1288 return -EPERM;
1289 }
1290 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1291 (newinfo.flags & ASYNC_USR_MASK));
1292 } else {
1293 port->close_delay = newinfo.close_delay;
1294 port->closing_wait = newinfo.closing_wait;
1295 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1296 (newinfo.flags & ASYNC_FLAGS));
1297 }
1298 if (reconfig_port) {
1299 unsigned long flags;
1300 spin_lock_irqsave(&port->card->card_lock, flags);
1301 isicom_config_port(port);
1302 spin_unlock_irqrestore(&port->card->card_lock, flags);
1303 }
1304 unlock_kernel();
1305 return 0;
1306 }
1307
1308 static int isicom_get_serial_info(struct isi_port *port,
1309 struct serial_struct __user *info)
1310 {
1311 struct serial_struct out_info;
1312
1313 lock_kernel();
1314 memset(&out_info, 0, sizeof(out_info));
1315 /* out_info.type = ? */
1316 out_info.line = port - isi_ports;
1317 out_info.port = port->card->base;
1318 out_info.irq = port->card->irq;
1319 out_info.flags = port->flags;
1320 /* out_info.baud_base = ? */
1321 out_info.close_delay = port->close_delay;
1322 out_info.closing_wait = port->closing_wait;
1323 unlock_kernel();
1324 if (copy_to_user(info, &out_info, sizeof(out_info)))
1325 return -EFAULT;
1326 return 0;
1327 }
1328
1329 static int isicom_ioctl(struct tty_struct *tty, struct file *filp,
1330 unsigned int cmd, unsigned long arg)
1331 {
1332 struct isi_port *port = tty->driver_data;
1333 void __user *argp = (void __user *)arg;
1334 int retval;
1335
1336 if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
1337 return -ENODEV;
1338
1339 switch (cmd) {
1340 case TCSBRK:
1341 retval = tty_check_change(tty);
1342 if (retval)
1343 return retval;
1344 tty_wait_until_sent(tty, 0);
1345 if (!arg)
1346 isicom_send_break(port, HZ/4);
1347 return 0;
1348
1349 case TCSBRKP:
1350 retval = tty_check_change(tty);
1351 if (retval)
1352 return retval;
1353 tty_wait_until_sent(tty, 0);
1354 isicom_send_break(port, arg ? arg * (HZ/10) : HZ/4);
1355 return 0;
1356 case TIOCGSERIAL:
1357 return isicom_get_serial_info(port, argp);
1358
1359 case TIOCSSERIAL:
1360 return isicom_set_serial_info(port, argp);
1361
1362 default:
1363 return -ENOIOCTLCMD;
1364 }
1365 return 0;
1366 }
1367
1368 /* set_termios et all */
1369 static void isicom_set_termios(struct tty_struct *tty,
1370 struct ktermios *old_termios)
1371 {
1372 struct isi_port *port = tty->driver_data;
1373 unsigned long flags;
1374
1375 if (isicom_paranoia_check(port, tty->name, "isicom_set_termios"))
1376 return;
1377
1378 if (tty->termios->c_cflag == old_termios->c_cflag &&
1379 tty->termios->c_iflag == old_termios->c_iflag)
1380 return;
1381
1382 spin_lock_irqsave(&port->card->card_lock, flags);
1383 isicom_config_port(port);
1384 spin_unlock_irqrestore(&port->card->card_lock, flags);
1385
1386 if ((old_termios->c_cflag & CRTSCTS) &&
1387 !(tty->termios->c_cflag & CRTSCTS)) {
1388 tty->hw_stopped = 0;
1389 isicom_start(tty);
1390 }
1391 }
1392
1393 /* throttle et all */
1394 static void isicom_throttle(struct tty_struct *tty)
1395 {
1396 struct isi_port *port = tty->driver_data;
1397 struct isi_board *card = port->card;
1398
1399 if (isicom_paranoia_check(port, tty->name, "isicom_throttle"))
1400 return;
1401
1402 /* tell the card that this port cannot handle any more data for now */
1403 card->port_status &= ~(1 << port->channel);
1404 outw(card->port_status, card->base + 0x02);
1405 }
1406
1407 /* unthrottle et all */
1408 static void isicom_unthrottle(struct tty_struct *tty)
1409 {
1410 struct isi_port *port = tty->driver_data;
1411 struct isi_board *card = port->card;
1412
1413 if (isicom_paranoia_check(port, tty->name, "isicom_unthrottle"))
1414 return;
1415
1416 /* tell the card that this port is ready to accept more data */
1417 card->port_status |= (1 << port->channel);
1418 outw(card->port_status, card->base + 0x02);
1419 }
1420
1421 /* stop et all */
1422 static void isicom_stop(struct tty_struct *tty)
1423 {
1424 struct isi_port *port = tty->driver_data;
1425
1426 if (isicom_paranoia_check(port, tty->name, "isicom_stop"))
1427 return;
1428
1429 /* this tells the transmitter not to consider this port for
1430 data output to the card. */
1431 port->status &= ~ISI_TXOK;
1432 }
1433
1434 /* start et all */
1435 static void isicom_start(struct tty_struct *tty)
1436 {
1437 struct isi_port *port = tty->driver_data;
1438
1439 if (isicom_paranoia_check(port, tty->name, "isicom_start"))
1440 return;
1441
1442 /* this tells the transmitter to consider this port for
1443 data output to the card. */
1444 port->status |= ISI_TXOK;
1445 }
1446
1447 static void isicom_hangup(struct tty_struct *tty)
1448 {
1449 struct isi_port *port = tty->driver_data;
1450 unsigned long flags;
1451
1452 if (isicom_paranoia_check(port, tty->name, "isicom_hangup"))
1453 return;
1454
1455 spin_lock_irqsave(&port->card->card_lock, flags);
1456 isicom_shutdown_port(port);
1457 spin_unlock_irqrestore(&port->card->card_lock, flags);
1458
1459 port->count = 0;
1460 port->flags &= ~ASYNC_NORMAL_ACTIVE;
1461 port->tty = NULL;
1462 wake_up_interruptible(&port->open_wait);
1463 }
1464
1465
1466 /*
1467 * Driver init and deinit functions
1468 */
1469
1470 static const struct tty_operations isicom_ops = {
1471 .open = isicom_open,
1472 .close = isicom_close,
1473 .write = isicom_write,
1474 .put_char = isicom_put_char,
1475 .flush_chars = isicom_flush_chars,
1476 .write_room = isicom_write_room,
1477 .chars_in_buffer = isicom_chars_in_buffer,
1478 .ioctl = isicom_ioctl,
1479 .set_termios = isicom_set_termios,
1480 .throttle = isicom_throttle,
1481 .unthrottle = isicom_unthrottle,
1482 .stop = isicom_stop,
1483 .start = isicom_start,
1484 .hangup = isicom_hangup,
1485 .flush_buffer = isicom_flush_buffer,
1486 .tiocmget = isicom_tiocmget,
1487 .tiocmset = isicom_tiocmset,
1488 };
1489
1490 static int __devinit reset_card(struct pci_dev *pdev,
1491 const unsigned int card, unsigned int *signature)
1492 {
1493 struct isi_board *board = pci_get_drvdata(pdev);
1494 unsigned long base = board->base;
1495 unsigned int sig, portcount = 0;
1496 int retval = 0;
1497
1498 dev_dbg(&pdev->dev, "ISILoad:Resetting Card%d at 0x%lx\n", card + 1,
1499 base);
1500
1501 inw(base + 0x8);
1502
1503 msleep(10);
1504
1505 outw(0, base + 0x8); /* Reset */
1506
1507 msleep(1000);
1508
1509 sig = inw(base + 0x4) & 0xff;
1510
1511 if (sig != 0xa5 && sig != 0xbb && sig != 0xcc && sig != 0xdd &&
1512 sig != 0xee) {
1513 dev_warn(&pdev->dev, "ISILoad:Card%u reset failure (Possible "
1514 "bad I/O Port Address 0x%lx).\n", card + 1, base);
1515 dev_dbg(&pdev->dev, "Sig=0x%x\n", sig);
1516 retval = -EIO;
1517 goto end;
1518 }
1519
1520 msleep(10);
1521
1522 portcount = inw(base + 0x2);
1523 if (!(inw(base + 0xe) & 0x1) || (portcount != 0 && portcount != 4 &&
1524 portcount != 8 && portcount != 16)) {
1525 dev_err(&pdev->dev, "ISILoad:PCI Card%d reset failure.\n",
1526 card + 1);
1527 retval = -EIO;
1528 goto end;
1529 }
1530
1531 switch (sig) {
1532 case 0xa5:
1533 case 0xbb:
1534 case 0xdd:
1535 board->port_count = (portcount == 4) ? 4 : 8;
1536 board->shift_count = 12;
1537 break;
1538 case 0xcc:
1539 case 0xee:
1540 board->port_count = 16;
1541 board->shift_count = 11;
1542 break;
1543 }
1544 dev_info(&pdev->dev, "-Done\n");
1545 *signature = sig;
1546
1547 end:
1548 return retval;
1549 }
1550
1551 static int __devinit load_firmware(struct pci_dev *pdev,
1552 const unsigned int index, const unsigned int signature)
1553 {
1554 struct isi_board *board = pci_get_drvdata(pdev);
1555 const struct firmware *fw;
1556 unsigned long base = board->base;
1557 unsigned int a;
1558 u16 word_count, status;
1559 int retval = -EIO;
1560 char *name;
1561 u8 *data;
1562
1563 struct stframe {
1564 u16 addr;
1565 u16 count;
1566 u8 data[0];
1567 } *frame;
1568
1569 switch (signature) {
1570 case 0xa5:
1571 name = "isi608.bin";
1572 break;
1573 case 0xbb:
1574 name = "isi608em.bin";
1575 break;
1576 case 0xcc:
1577 name = "isi616em.bin";
1578 break;
1579 case 0xdd:
1580 name = "isi4608.bin";
1581 break;
1582 case 0xee:
1583 name = "isi4616.bin";
1584 break;
1585 default:
1586 dev_err(&pdev->dev, "Unknown signature.\n");
1587 goto end;
1588 }
1589
1590 retval = request_firmware(&fw, name, &pdev->dev);
1591 if (retval)
1592 goto end;
1593
1594 retval = -EIO;
1595
1596 for (frame = (struct stframe *)fw->data;
1597 frame < (struct stframe *)(fw->data + fw->size);
1598 frame = (struct stframe *)((u8 *)(frame + 1) +
1599 frame->count)) {
1600 if (WaitTillCardIsFree(base))
1601 goto errrelfw;
1602
1603 outw(0xf0, base); /* start upload sequence */
1604 outw(0x00, base);
1605 outw(frame->addr, base); /* lsb of address */
1606
1607 word_count = frame->count / 2 + frame->count % 2;
1608 outw(word_count, base);
1609 InterruptTheCard(base);
1610
1611 udelay(100); /* 0x2f */
1612
1613 if (WaitTillCardIsFree(base))
1614 goto errrelfw;
1615
1616 status = inw(base + 0x4);
1617 if (status != 0) {
1618 dev_warn(&pdev->dev, "Card%d rejected load header:\n"
1619 KERN_WARNING "Address:0x%x\n"
1620 KERN_WARNING "Count:0x%x\n"
1621 KERN_WARNING "Status:0x%x\n",
1622 index + 1, frame->addr, frame->count, status);
1623 goto errrelfw;
1624 }
1625 outsw(base, frame->data, word_count);
1626
1627 InterruptTheCard(base);
1628
1629 udelay(50); /* 0x0f */
1630
1631 if (WaitTillCardIsFree(base))
1632 goto errrelfw;
1633
1634 status = inw(base + 0x4);
1635 if (status != 0) {
1636 dev_err(&pdev->dev, "Card%d got out of sync.Card "
1637 "Status:0x%x\n", index + 1, status);
1638 goto errrelfw;
1639 }
1640 }
1641
1642 /* XXX: should we test it by reading it back and comparing with original like
1643 * in load firmware package? */
1644 for (frame = (struct stframe *)fw->data;
1645 frame < (struct stframe *)(fw->data + fw->size);
1646 frame = (struct stframe *)((u8 *)(frame + 1) +
1647 frame->count)) {
1648 if (WaitTillCardIsFree(base))
1649 goto errrelfw;
1650
1651 outw(0xf1, base); /* start download sequence */
1652 outw(0x00, base);
1653 outw(frame->addr, base); /* lsb of address */
1654
1655 word_count = (frame->count >> 1) + frame->count % 2;
1656 outw(word_count + 1, base);
1657 InterruptTheCard(base);
1658
1659 udelay(50); /* 0xf */
1660
1661 if (WaitTillCardIsFree(base))
1662 goto errrelfw;
1663
1664 status = inw(base + 0x4);
1665 if (status != 0) {
1666 dev_warn(&pdev->dev, "Card%d rejected verify header:\n"
1667 KERN_WARNING "Address:0x%x\n"
1668 KERN_WARNING "Count:0x%x\n"
1669 KERN_WARNING "Status: 0x%x\n",
1670 index + 1, frame->addr, frame->count, status);
1671 goto errrelfw;
1672 }
1673
1674 data = kmalloc(word_count * 2, GFP_KERNEL);
1675 if (data == NULL) {
1676 dev_err(&pdev->dev, "Card%d, firmware upload "
1677 "failed, not enough memory\n", index + 1);
1678 goto errrelfw;
1679 }
1680 inw(base);
1681 insw(base, data, word_count);
1682 InterruptTheCard(base);
1683
1684 for (a = 0; a < frame->count; a++)
1685 if (data[a] != frame->data[a]) {
1686 kfree(data);
1687 dev_err(&pdev->dev, "Card%d, firmware upload "
1688 "failed\n", index + 1);
1689 goto errrelfw;
1690 }
1691 kfree(data);
1692
1693 udelay(50); /* 0xf */
1694
1695 if (WaitTillCardIsFree(base))
1696 goto errrelfw;
1697
1698 status = inw(base + 0x4);
1699 if (status != 0) {
1700 dev_err(&pdev->dev, "Card%d verify got out of sync. "
1701 "Card Status:0x%x\n", index + 1, status);
1702 goto errrelfw;
1703 }
1704 }
1705
1706 /* xfer ctrl */
1707 if (WaitTillCardIsFree(base))
1708 goto errrelfw;
1709
1710 outw(0xf2, base);
1711 outw(0x800, base);
1712 outw(0x0, base);
1713 outw(0x0, base);
1714 InterruptTheCard(base);
1715 outw(0x0, base + 0x4); /* for ISI4608 cards */
1716
1717 board->status |= FIRMWARE_LOADED;
1718 retval = 0;
1719
1720 errrelfw:
1721 release_firmware(fw);
1722 end:
1723 return retval;
1724 }
1725
1726 /*
1727 * Insmod can set static symbols so keep these static
1728 */
1729 static unsigned int card_count;
1730
1731 static int __devinit isicom_probe(struct pci_dev *pdev,
1732 const struct pci_device_id *ent)
1733 {
1734 unsigned int signature, index;
1735 int retval = -EPERM;
1736 struct isi_board *board = NULL;
1737
1738 if (card_count >= BOARD_COUNT)
1739 goto err;
1740
1741 dev_info(&pdev->dev, "ISI PCI Card(Device ID 0x%x)\n", ent->device);
1742
1743 /* allot the first empty slot in the array */
1744 for (index = 0; index < BOARD_COUNT; index++)
1745 if (isi_card[index].base == 0) {
1746 board = &isi_card[index];
1747 break;
1748 }
1749
1750 board->index = index;
1751 board->base = pci_resource_start(pdev, 3);
1752 board->irq = pdev->irq;
1753 card_count++;
1754
1755 pci_set_drvdata(pdev, board);
1756
1757 retval = pci_request_region(pdev, 3, ISICOM_NAME);
1758 if (retval) {
1759 dev_err(&pdev->dev, "I/O Region 0x%lx-0x%lx is busy. Card%d "
1760 "will be disabled.\n", board->base, board->base + 15,
1761 index + 1);
1762 retval = -EBUSY;
1763 goto errdec;
1764 }
1765
1766 retval = request_irq(board->irq, isicom_interrupt,
1767 IRQF_SHARED | IRQF_DISABLED, ISICOM_NAME, board);
1768 if (retval < 0) {
1769 dev_err(&pdev->dev, "Could not install handler at Irq %d. "
1770 "Card%d will be disabled.\n", board->irq, index + 1);
1771 goto errunrr;
1772 }
1773
1774 retval = reset_card(pdev, index, &signature);
1775 if (retval < 0)
1776 goto errunri;
1777
1778 retval = load_firmware(pdev, index, signature);
1779 if (retval < 0)
1780 goto errunri;
1781
1782 for (index = 0; index < board->port_count; index++)
1783 tty_register_device(isicom_normal, board->index * 16 + index,
1784 &pdev->dev);
1785
1786 return 0;
1787
1788 errunri:
1789 free_irq(board->irq, board);
1790 errunrr:
1791 pci_release_region(pdev, 3);
1792 errdec:
1793 board->base = 0;
1794 card_count--;
1795 err:
1796 return retval;
1797 }
1798
1799 static void __devexit isicom_remove(struct pci_dev *pdev)
1800 {
1801 struct isi_board *board = pci_get_drvdata(pdev);
1802 unsigned int i;
1803
1804 for (i = 0; i < board->port_count; i++)
1805 tty_unregister_device(isicom_normal, board->index * 16 + i);
1806
1807 free_irq(board->irq, board);
1808 pci_release_region(pdev, 3);
1809 board->base = 0;
1810 card_count--;
1811 }
1812
1813 static int __init isicom_init(void)
1814 {
1815 int retval, idx, channel;
1816 struct isi_port *port;
1817
1818 for (idx = 0; idx < BOARD_COUNT; idx++) {
1819 port = &isi_ports[idx * 16];
1820 isi_card[idx].ports = port;
1821 spin_lock_init(&isi_card[idx].card_lock);
1822 for (channel = 0; channel < 16; channel++, port++) {
1823 port->magic = ISICOM_MAGIC;
1824 port->card = &isi_card[idx];
1825 port->channel = channel;
1826 port->close_delay = 50 * HZ/100;
1827 port->closing_wait = 3000 * HZ/100;
1828 port->status = 0;
1829 init_waitqueue_head(&port->open_wait);
1830 init_waitqueue_head(&port->close_wait);
1831 /* . . . */
1832 }
1833 isi_card[idx].base = 0;
1834 isi_card[idx].irq = 0;
1835 }
1836
1837 /* tty driver structure initialization */
1838 isicom_normal = alloc_tty_driver(PORT_COUNT);
1839 if (!isicom_normal) {
1840 retval = -ENOMEM;
1841 goto error;
1842 }
1843
1844 isicom_normal->owner = THIS_MODULE;
1845 isicom_normal->name = "ttyM";
1846 isicom_normal->major = ISICOM_NMAJOR;
1847 isicom_normal->minor_start = 0;
1848 isicom_normal->type = TTY_DRIVER_TYPE_SERIAL;
1849 isicom_normal->subtype = SERIAL_TYPE_NORMAL;
1850 isicom_normal->init_termios = tty_std_termios;
1851 isicom_normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
1852 CLOCAL;
1853 isicom_normal->flags = TTY_DRIVER_REAL_RAW |
1854 TTY_DRIVER_DYNAMIC_DEV;
1855 tty_set_operations(isicom_normal, &isicom_ops);
1856
1857 retval = tty_register_driver(isicom_normal);
1858 if (retval) {
1859 pr_dbg("Couldn't register the dialin driver\n");
1860 goto err_puttty;
1861 }
1862
1863 retval = pci_register_driver(&isicom_driver);
1864 if (retval < 0) {
1865 printk(KERN_ERR "ISICOM: Unable to register pci driver.\n");
1866 goto err_unrtty;
1867 }
1868
1869 mod_timer(&tx, jiffies + 1);
1870
1871 return 0;
1872 err_unrtty:
1873 tty_unregister_driver(isicom_normal);
1874 err_puttty:
1875 put_tty_driver(isicom_normal);
1876 error:
1877 return retval;
1878 }
1879
1880 static void __exit isicom_exit(void)
1881 {
1882 del_timer_sync(&tx);
1883
1884 pci_unregister_driver(&isicom_driver);
1885 tty_unregister_driver(isicom_normal);
1886 put_tty_driver(isicom_normal);
1887 }
1888
1889 module_init(isicom_init);
1890 module_exit(isicom_exit);
1891
1892 MODULE_AUTHOR("MultiTech");
1893 MODULE_DESCRIPTION("Driver for the ISI series of cards by MultiTech");
1894 MODULE_LICENSE("GPL");
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