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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Berkshire PCI-PC Watchdog Card Driver
4 *
5 * (c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>.
6 *
7 * Based on source code of the following authors:
8 * Ken Hollis <kenji@bitgate.com>,
9 * Lindsay Harris <lindsay@bluegum.com>,
10 * Alan Cox <alan@lxorguk.ukuu.org.uk>,
11 * Matt Domsch <Matt_Domsch@dell.com>,
12 * Rob Radez <rob@osinvestor.com>
13 *
14 * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
15 * provide warranty for any of this software. This material is
16 * provided "AS-IS" and at no charge.
17 */
18
19/*
20 * A bells and whistles driver is available from:
21 * http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/
22 *
23 * More info available at
24 * http://www.berkprod.com/ or http://www.pcwatchdog.com/
25 */
26
27/*
28 * Includes, defines, variables, module parameters, ...
29 */
30
31#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32
33#include <linux/module.h> /* For module specific items */
34#include <linux/moduleparam.h> /* For new moduleparam's */
35#include <linux/types.h> /* For standard types (like size_t) */
36#include <linux/errno.h> /* For the -ENODEV/... values */
37#include <linux/kernel.h> /* For printk/panic/... */
38#include <linux/delay.h> /* For mdelay function */
39#include <linux/miscdevice.h> /* For struct miscdevice */
40#include <linux/watchdog.h> /* For the watchdog specific items */
41#include <linux/notifier.h> /* For notifier support */
42#include <linux/reboot.h> /* For reboot_notifier stuff */
43#include <linux/init.h> /* For __init/__exit/... */
44#include <linux/fs.h> /* For file operations */
45#include <linux/pci.h> /* For pci functions */
46#include <linux/ioport.h> /* For io-port access */
47#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
48#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
49#include <linux/io.h> /* For inb/outb/... */
50
51/* Module and version information */
52#define WATCHDOG_VERSION "1.03"
53#define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
54#define WATCHDOG_NAME "pcwd_pci"
55#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION
56
57/* Stuff for the PCI ID's */
58#ifndef PCI_VENDOR_ID_QUICKLOGIC
59#define PCI_VENDOR_ID_QUICKLOGIC 0x11e3
60#endif
61
62#ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
63#define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
64#endif
65
66/*
67 * These are the defines that describe the control status bits for the
68 * PCI-PC Watchdog card.
69 */
70/* Port 1 : Control Status #1 */
71#define WD_PCI_WTRP 0x01 /* Watchdog Trip status */
72#define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */
73#define WD_PCI_TTRP 0x04 /* Temperature Trip status */
74#define WD_PCI_RL2A 0x08 /* Relay 2 Active */
75#define WD_PCI_RL1A 0x10 /* Relay 1 Active */
76#define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip /
77 reset */
78#define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */
79/* Port 2 : Control Status #2 */
80#define WD_PCI_WDIS 0x10 /* Watchdog Disable */
81#define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */
82#define WD_PCI_WRSP 0x40 /* Watchdog wrote response */
83#define WD_PCI_PCMD 0x80 /* PC has sent command */
84
85/* according to documentation max. time to process a command for the pci
86 * watchdog card is 100 ms, so we give it 150 ms to do it's job */
87#define PCI_COMMAND_TIMEOUT 150
88
89/* Watchdog's internal commands */
90#define CMD_GET_STATUS 0x04
91#define CMD_GET_FIRMWARE_VERSION 0x08
92#define CMD_READ_WATCHDOG_TIMEOUT 0x18
93#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19
94#define CMD_GET_CLEAR_RESET_COUNT 0x84
95
96/* Watchdog's Dip Switch heartbeat values */
97static const int heartbeat_tbl[] = {
98 5, /* OFF-OFF-OFF = 5 Sec */
99 10, /* OFF-OFF-ON = 10 Sec */
100 30, /* OFF-ON-OFF = 30 Sec */
101 60, /* OFF-ON-ON = 1 Min */
102 300, /* ON-OFF-OFF = 5 Min */
103 600, /* ON-OFF-ON = 10 Min */
104 1800, /* ON-ON-OFF = 30 Min */
105 3600, /* ON-ON-ON = 1 hour */
106};
107
108/* We can only use 1 card due to the /dev/watchdog restriction */
109static int cards_found;
110
111/* internal variables */
112static int temp_panic;
113static unsigned long is_active;
114static char expect_release;
115/* this is private data for each PCI-PC watchdog card */
116static struct {
117 /* Wether or not the card has a temperature device */
118 int supports_temp;
119 /* The card's boot status */
120 int boot_status;
121 /* The cards I/O address */
122 unsigned long io_addr;
123 /* the lock for io operations */
124 spinlock_t io_lock;
125 /* the PCI-device */
126 struct pci_dev *pdev;
127} pcipcwd_private;
128
129/* module parameters */
130#define QUIET 0 /* Default */
131#define VERBOSE 1 /* Verbose */
132#define DEBUG 2 /* print fancy stuff too */
133static int debug = QUIET;
134module_param(debug, int, 0);
135MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
136
137#define WATCHDOG_HEARTBEAT 0 /* default heartbeat =
138 delay-time from dip-switches */
139static int heartbeat = WATCHDOG_HEARTBEAT;
140module_param(heartbeat, int, 0);
141MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
142 "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
143 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
144
145static bool nowayout = WATCHDOG_NOWAYOUT;
146module_param(nowayout, bool, 0);
147MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
148 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
149
150/*
151 * Internal functions
152 */
153
154static int send_command(int cmd, int *msb, int *lsb)
155{
156 int got_response, count;
157
158 if (debug >= DEBUG)
159 pr_debug("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
160 cmd, *msb, *lsb);
161
162 spin_lock(&pcipcwd_private.io_lock);
163 /* If a command requires data it should be written first.
164 * Data for commands with 8 bits of data should be written to port 4.
165 * Commands with 16 bits of data, should be written as LSB to port 4
166 * and MSB to port 5.
167 * After the required data has been written then write the command to
168 * port 6. */
169 outb_p(*lsb, pcipcwd_private.io_addr + 4);
170 outb_p(*msb, pcipcwd_private.io_addr + 5);
171 outb_p(cmd, pcipcwd_private.io_addr + 6);
172
173 /* wait till the pci card processed the command, signaled by
174 * the WRSP bit in port 2 and give it a max. timeout of
175 * PCI_COMMAND_TIMEOUT to process */
176 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
177 for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response);
178 count++) {
179 mdelay(1);
180 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
181 }
182
183 if (debug >= DEBUG) {
184 if (got_response) {
185 pr_debug("time to process command was: %d ms\n",
186 count);
187 } else {
188 pr_debug("card did not respond on command!\n");
189 }
190 }
191
192 if (got_response) {
193 /* read back response */
194 *lsb = inb_p(pcipcwd_private.io_addr + 4);
195 *msb = inb_p(pcipcwd_private.io_addr + 5);
196
197 /* clear WRSP bit */
198 inb_p(pcipcwd_private.io_addr + 6);
199
200 if (debug >= DEBUG)
201 pr_debug("received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
202 cmd, *msb, *lsb);
203 }
204
205 spin_unlock(&pcipcwd_private.io_lock);
206
207 return got_response;
208}
209
210static inline void pcipcwd_check_temperature_support(void)
211{
212 if (inb_p(pcipcwd_private.io_addr) != 0xF0)
213 pcipcwd_private.supports_temp = 1;
214}
215
216static int pcipcwd_get_option_switches(void)
217{
218 int option_switches;
219
220 option_switches = inb_p(pcipcwd_private.io_addr + 3);
221 return option_switches;
222}
223
224static void pcipcwd_show_card_info(void)
225{
226 int got_fw_rev, fw_rev_major, fw_rev_minor;
227 char fw_ver_str[20]; /* The cards firmware version */
228 int option_switches;
229
230 got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major,
231 &fw_rev_minor);
232 if (got_fw_rev)
233 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
234 else
235 sprintf(fw_ver_str, "<card no answer>");
236
237 /* Get switch settings */
238 option_switches = pcipcwd_get_option_switches();
239
240 pr_info("Found card at port 0x%04x (Firmware: %s) %s temp option\n",
241 (int) pcipcwd_private.io_addr, fw_ver_str,
242 (pcipcwd_private.supports_temp ? "with" : "without"));
243
244 pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
245 option_switches,
246 ((option_switches & 0x10) ? "ON" : "OFF"),
247 ((option_switches & 0x08) ? "ON" : "OFF"));
248
249 if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
250 pr_info("Previous reset was caused by the Watchdog card\n");
251
252 if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
253 pr_info("Card sensed a CPU Overheat\n");
254
255 if (pcipcwd_private.boot_status == 0)
256 pr_info("No previous trip detected - Cold boot or reset\n");
257}
258
259static int pcipcwd_start(void)
260{
261 int stat_reg;
262
263 spin_lock(&pcipcwd_private.io_lock);
264 outb_p(0x00, pcipcwd_private.io_addr + 3);
265 udelay(1000);
266
267 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
268 spin_unlock(&pcipcwd_private.io_lock);
269
270 if (stat_reg & WD_PCI_WDIS) {
271 pr_err("Card timer not enabled\n");
272 return -1;
273 }
274
275 if (debug >= VERBOSE)
276 pr_debug("Watchdog started\n");
277
278 return 0;
279}
280
281static int pcipcwd_stop(void)
282{
283 int stat_reg;
284
285 spin_lock(&pcipcwd_private.io_lock);
286 outb_p(0xA5, pcipcwd_private.io_addr + 3);
287 udelay(1000);
288
289 outb_p(0xA5, pcipcwd_private.io_addr + 3);
290 udelay(1000);
291
292 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
293 spin_unlock(&pcipcwd_private.io_lock);
294
295 if (!(stat_reg & WD_PCI_WDIS)) {
296 pr_err("Card did not acknowledge disable attempt\n");
297 return -1;
298 }
299
300 if (debug >= VERBOSE)
301 pr_debug("Watchdog stopped\n");
302
303 return 0;
304}
305
306static int pcipcwd_keepalive(void)
307{
308 /* Re-trigger watchdog by writing to port 0 */
309 spin_lock(&pcipcwd_private.io_lock);
310 outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */
311 spin_unlock(&pcipcwd_private.io_lock);
312
313 if (debug >= DEBUG)
314 pr_debug("Watchdog keepalive signal send\n");
315
316 return 0;
317}
318
319static int pcipcwd_set_heartbeat(int t)
320{
321 int t_msb = t / 256;
322 int t_lsb = t % 256;
323
324 if ((t < 0x0001) || (t > 0xFFFF))
325 return -EINVAL;
326
327 /* Write new heartbeat to watchdog */
328 send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
329
330 heartbeat = t;
331 if (debug >= VERBOSE)
332 pr_debug("New heartbeat: %d\n", heartbeat);
333
334 return 0;
335}
336
337static int pcipcwd_get_status(int *status)
338{
339 int control_status;
340
341 *status = 0;
342 control_status = inb_p(pcipcwd_private.io_addr + 1);
343 if (control_status & WD_PCI_WTRP)
344 *status |= WDIOF_CARDRESET;
345 if (control_status & WD_PCI_TTRP) {
346 *status |= WDIOF_OVERHEAT;
347 if (temp_panic)
348 panic(KBUILD_MODNAME ": Temperature overheat trip!\n");
349 }
350
351 if (debug >= DEBUG)
352 pr_debug("Control Status #1: 0x%02x\n", control_status);
353
354 return 0;
355}
356
357static int pcipcwd_clear_status(void)
358{
359 int control_status;
360 int msb;
361 int reset_counter;
362
363 if (debug >= VERBOSE)
364 pr_info("clearing watchdog trip status & LED\n");
365
366 control_status = inb_p(pcipcwd_private.io_addr + 1);
367
368 if (debug >= DEBUG) {
369 pr_debug("status was: 0x%02x\n", control_status);
370 pr_debug("sending: 0x%02x\n",
371 (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
372 }
373
374 /* clear trip status & LED and keep mode of relay 2 */
375 outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP,
376 pcipcwd_private.io_addr + 1);
377
378 /* clear reset counter */
379 msb = 0;
380 reset_counter = 0xff;
381 send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
382
383 if (debug >= DEBUG) {
384 pr_debug("reset count was: 0x%02x\n", reset_counter);
385 }
386
387 return 0;
388}
389
390static int pcipcwd_get_temperature(int *temperature)
391{
392 *temperature = 0;
393 if (!pcipcwd_private.supports_temp)
394 return -ENODEV;
395
396 spin_lock(&pcipcwd_private.io_lock);
397 *temperature = inb_p(pcipcwd_private.io_addr);
398 spin_unlock(&pcipcwd_private.io_lock);
399
400 /*
401 * Convert celsius to fahrenheit, since this was
402 * the decided 'standard' for this return value.
403 */
404 *temperature = (*temperature * 9 / 5) + 32;
405
406 if (debug >= DEBUG) {
407 pr_debug("temperature is: %d F\n", *temperature);
408 }
409
410 return 0;
411}
412
413static int pcipcwd_get_timeleft(int *time_left)
414{
415 int msb;
416 int lsb;
417
418 /* Read the time that's left before rebooting */
419 /* Note: if the board is not yet armed then we will read 0xFFFF */
420 send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
421
422 *time_left = (msb << 8) + lsb;
423
424 if (debug >= VERBOSE)
425 pr_debug("Time left before next reboot: %d\n", *time_left);
426
427 return 0;
428}
429
430/*
431 * /dev/watchdog handling
432 */
433
434static ssize_t pcipcwd_write(struct file *file, const char __user *data,
435 size_t len, loff_t *ppos)
436{
437 /* See if we got the magic character 'V' and reload the timer */
438 if (len) {
439 if (!nowayout) {
440 size_t i;
441
442 /* note: just in case someone wrote the magic character
443 * five months ago... */
444 expect_release = 0;
445
446 /* scan to see whether or not we got the
447 * magic character */
448 for (i = 0; i != len; i++) {
449 char c;
450 if (get_user(c, data + i))
451 return -EFAULT;
452 if (c == 'V')
453 expect_release = 42;
454 }
455 }
456
457 /* someone wrote to us, we should reload the timer */
458 pcipcwd_keepalive();
459 }
460 return len;
461}
462
463static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
464 unsigned long arg)
465{
466 void __user *argp = (void __user *)arg;
467 int __user *p = argp;
468 static const struct watchdog_info ident = {
469 .options = WDIOF_OVERHEAT |
470 WDIOF_CARDRESET |
471 WDIOF_KEEPALIVEPING |
472 WDIOF_SETTIMEOUT |
473 WDIOF_MAGICCLOSE,
474 .firmware_version = 1,
475 .identity = WATCHDOG_DRIVER_NAME,
476 };
477
478 switch (cmd) {
479 case WDIOC_GETSUPPORT:
480 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
481
482 case WDIOC_GETSTATUS:
483 {
484 int status;
485 pcipcwd_get_status(&status);
486 return put_user(status, p);
487 }
488
489 case WDIOC_GETBOOTSTATUS:
490 return put_user(pcipcwd_private.boot_status, p);
491
492 case WDIOC_GETTEMP:
493 {
494 int temperature;
495
496 if (pcipcwd_get_temperature(&temperature))
497 return -EFAULT;
498
499 return put_user(temperature, p);
500 }
501
502 case WDIOC_SETOPTIONS:
503 {
504 int new_options, retval = -EINVAL;
505
506 if (get_user(new_options, p))
507 return -EFAULT;
508
509 if (new_options & WDIOS_DISABLECARD) {
510 if (pcipcwd_stop())
511 return -EIO;
512 retval = 0;
513 }
514
515 if (new_options & WDIOS_ENABLECARD) {
516 if (pcipcwd_start())
517 return -EIO;
518 retval = 0;
519 }
520
521 if (new_options & WDIOS_TEMPPANIC) {
522 temp_panic = 1;
523 retval = 0;
524 }
525
526 return retval;
527 }
528
529 case WDIOC_KEEPALIVE:
530 pcipcwd_keepalive();
531 return 0;
532
533 case WDIOC_SETTIMEOUT:
534 {
535 int new_heartbeat;
536
537 if (get_user(new_heartbeat, p))
538 return -EFAULT;
539
540 if (pcipcwd_set_heartbeat(new_heartbeat))
541 return -EINVAL;
542
543 pcipcwd_keepalive();
544 }
545 fallthrough;
546
547 case WDIOC_GETTIMEOUT:
548 return put_user(heartbeat, p);
549
550 case WDIOC_GETTIMELEFT:
551 {
552 int time_left;
553
554 if (pcipcwd_get_timeleft(&time_left))
555 return -EFAULT;
556
557 return put_user(time_left, p);
558 }
559
560 default:
561 return -ENOTTY;
562 }
563}
564
565static int pcipcwd_open(struct inode *inode, struct file *file)
566{
567 /* /dev/watchdog can only be opened once */
568 if (test_and_set_bit(0, &is_active)) {
569 if (debug >= VERBOSE)
570 pr_err("Attempt to open already opened device\n");
571 return -EBUSY;
572 }
573
574 /* Activate */
575 pcipcwd_start();
576 pcipcwd_keepalive();
577 return stream_open(inode, file);
578}
579
580static int pcipcwd_release(struct inode *inode, struct file *file)
581{
582 /*
583 * Shut off the timer.
584 */
585 if (expect_release == 42) {
586 pcipcwd_stop();
587 } else {
588 pr_crit("Unexpected close, not stopping watchdog!\n");
589 pcipcwd_keepalive();
590 }
591 expect_release = 0;
592 clear_bit(0, &is_active);
593 return 0;
594}
595
596/*
597 * /dev/temperature handling
598 */
599
600static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
601 size_t len, loff_t *ppos)
602{
603 int temperature;
604
605 if (pcipcwd_get_temperature(&temperature))
606 return -EFAULT;
607
608 if (copy_to_user(data, &temperature, 1))
609 return -EFAULT;
610
611 return 1;
612}
613
614static int pcipcwd_temp_open(struct inode *inode, struct file *file)
615{
616 if (!pcipcwd_private.supports_temp)
617 return -ENODEV;
618
619 return stream_open(inode, file);
620}
621
622static int pcipcwd_temp_release(struct inode *inode, struct file *file)
623{
624 return 0;
625}
626
627/*
628 * Notify system
629 */
630
631static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code,
632 void *unused)
633{
634 if (code == SYS_DOWN || code == SYS_HALT)
635 pcipcwd_stop(); /* Turn the WDT off */
636
637 return NOTIFY_DONE;
638}
639
640/*
641 * Kernel Interfaces
642 */
643
644static const struct file_operations pcipcwd_fops = {
645 .owner = THIS_MODULE,
646 .llseek = no_llseek,
647 .write = pcipcwd_write,
648 .unlocked_ioctl = pcipcwd_ioctl,
649 .compat_ioctl = compat_ptr_ioctl,
650 .open = pcipcwd_open,
651 .release = pcipcwd_release,
652};
653
654static struct miscdevice pcipcwd_miscdev = {
655 .minor = WATCHDOG_MINOR,
656 .name = "watchdog",
657 .fops = &pcipcwd_fops,
658};
659
660static const struct file_operations pcipcwd_temp_fops = {
661 .owner = THIS_MODULE,
662 .llseek = no_llseek,
663 .read = pcipcwd_temp_read,
664 .open = pcipcwd_temp_open,
665 .release = pcipcwd_temp_release,
666};
667
668static struct miscdevice pcipcwd_temp_miscdev = {
669 .minor = TEMP_MINOR,
670 .name = "temperature",
671 .fops = &pcipcwd_temp_fops,
672};
673
674static struct notifier_block pcipcwd_notifier = {
675 .notifier_call = pcipcwd_notify_sys,
676};
677
678/*
679 * Init & exit routines
680 */
681
682static int pcipcwd_card_init(struct pci_dev *pdev,
683 const struct pci_device_id *ent)
684{
685 int ret = -EIO;
686
687 cards_found++;
688 if (cards_found == 1)
689 pr_info("%s\n", DRIVER_VERSION);
690
691 if (cards_found > 1) {
692 pr_err("This driver only supports 1 device\n");
693 return -ENODEV;
694 }
695
696 if (pci_enable_device(pdev)) {
697 pr_err("Not possible to enable PCI Device\n");
698 return -ENODEV;
699 }
700
701 if (pci_resource_start(pdev, 0) == 0x0000) {
702 pr_err("No I/O-Address for card detected\n");
703 ret = -ENODEV;
704 goto err_out_disable_device;
705 }
706
707 spin_lock_init(&pcipcwd_private.io_lock);
708 pcipcwd_private.pdev = pdev;
709 pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
710
711 if (pci_request_regions(pdev, WATCHDOG_NAME)) {
712 pr_err("I/O address 0x%04x already in use\n",
713 (int) pcipcwd_private.io_addr);
714 ret = -EIO;
715 goto err_out_disable_device;
716 }
717
718 /* get the boot_status */
719 pcipcwd_get_status(&pcipcwd_private.boot_status);
720
721 /* clear the "card caused reboot" flag */
722 pcipcwd_clear_status();
723
724 /* disable card */
725 pcipcwd_stop();
726
727 /* Check whether or not the card supports the temperature device */
728 pcipcwd_check_temperature_support();
729
730 /* Show info about the card itself */
731 pcipcwd_show_card_info();
732
733 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
734 if (heartbeat == 0)
735 heartbeat =
736 heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
737
738 /* Check that the heartbeat value is within it's range ;
739 * if not reset to the default */
740 if (pcipcwd_set_heartbeat(heartbeat)) {
741 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
742 pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n",
743 WATCHDOG_HEARTBEAT);
744 }
745
746 ret = register_reboot_notifier(&pcipcwd_notifier);
747 if (ret != 0) {
748 pr_err("cannot register reboot notifier (err=%d)\n", ret);
749 goto err_out_release_region;
750 }
751
752 if (pcipcwd_private.supports_temp) {
753 ret = misc_register(&pcipcwd_temp_miscdev);
754 if (ret != 0) {
755 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
756 TEMP_MINOR, ret);
757 goto err_out_unregister_reboot;
758 }
759 }
760
761 ret = misc_register(&pcipcwd_miscdev);
762 if (ret != 0) {
763 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
764 WATCHDOG_MINOR, ret);
765 goto err_out_misc_deregister;
766 }
767
768 pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
769 heartbeat, nowayout);
770
771 return 0;
772
773err_out_misc_deregister:
774 if (pcipcwd_private.supports_temp)
775 misc_deregister(&pcipcwd_temp_miscdev);
776err_out_unregister_reboot:
777 unregister_reboot_notifier(&pcipcwd_notifier);
778err_out_release_region:
779 pci_release_regions(pdev);
780err_out_disable_device:
781 pci_disable_device(pdev);
782 return ret;
783}
784
785static void pcipcwd_card_exit(struct pci_dev *pdev)
786{
787 /* Stop the timer before we leave */
788 if (!nowayout)
789 pcipcwd_stop();
790
791 /* Deregister */
792 misc_deregister(&pcipcwd_miscdev);
793 if (pcipcwd_private.supports_temp)
794 misc_deregister(&pcipcwd_temp_miscdev);
795 unregister_reboot_notifier(&pcipcwd_notifier);
796 pci_release_regions(pdev);
797 pci_disable_device(pdev);
798 cards_found--;
799}
800
801static const struct pci_device_id pcipcwd_pci_tbl[] = {
802 { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
803 PCI_ANY_ID, PCI_ANY_ID, },
804 { 0 }, /* End of list */
805};
806MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
807
808static struct pci_driver pcipcwd_driver = {
809 .name = WATCHDOG_NAME,
810 .id_table = pcipcwd_pci_tbl,
811 .probe = pcipcwd_card_init,
812 .remove = pcipcwd_card_exit,
813};
814
815module_pci_driver(pcipcwd_driver);
816
817MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
818MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
819MODULE_LICENSE("GPL");
1/*
2 * Berkshire PCI-PC Watchdog Card Driver
3 *
4 * (c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>.
5 *
6 * Based on source code of the following authors:
7 * Ken Hollis <kenji@bitgate.com>,
8 * Lindsay Harris <lindsay@bluegum.com>,
9 * Alan Cox <alan@lxorguk.ukuu.org.uk>,
10 * Matt Domsch <Matt_Domsch@dell.com>,
11 * Rob Radez <rob@osinvestor.com>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 *
18 * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
19 * provide warranty for any of this software. This material is
20 * provided "AS-IS" and at no charge.
21 */
22
23/*
24 * A bells and whistles driver is available from:
25 * http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/
26 *
27 * More info available at
28 * http://www.berkprod.com/ or http://www.pcwatchdog.com/
29 */
30
31/*
32 * Includes, defines, variables, module parameters, ...
33 */
34
35#include <linux/module.h> /* For module specific items */
36#include <linux/moduleparam.h> /* For new moduleparam's */
37#include <linux/types.h> /* For standard types (like size_t) */
38#include <linux/errno.h> /* For the -ENODEV/... values */
39#include <linux/kernel.h> /* For printk/panic/... */
40#include <linux/delay.h> /* For mdelay function */
41#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
42#include <linux/watchdog.h> /* For the watchdog specific items */
43#include <linux/notifier.h> /* For notifier support */
44#include <linux/reboot.h> /* For reboot_notifier stuff */
45#include <linux/init.h> /* For __init/__exit/... */
46#include <linux/fs.h> /* For file operations */
47#include <linux/pci.h> /* For pci functions */
48#include <linux/ioport.h> /* For io-port access */
49#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
50#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
51#include <linux/io.h> /* For inb/outb/... */
52
53/* Module and version information */
54#define WATCHDOG_VERSION "1.03"
55#define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
56#define WATCHDOG_NAME "pcwd_pci"
57#define PFX WATCHDOG_NAME ": "
58#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n"
59
60/* Stuff for the PCI ID's */
61#ifndef PCI_VENDOR_ID_QUICKLOGIC
62#define PCI_VENDOR_ID_QUICKLOGIC 0x11e3
63#endif
64
65#ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
66#define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
67#endif
68
69/*
70 * These are the defines that describe the control status bits for the
71 * PCI-PC Watchdog card.
72 */
73/* Port 1 : Control Status #1 */
74#define WD_PCI_WTRP 0x01 /* Watchdog Trip status */
75#define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */
76#define WD_PCI_TTRP 0x04 /* Temperature Trip status */
77#define WD_PCI_RL2A 0x08 /* Relay 2 Active */
78#define WD_PCI_RL1A 0x10 /* Relay 1 Active */
79#define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip /
80 reset */
81#define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */
82/* Port 2 : Control Status #2 */
83#define WD_PCI_WDIS 0x10 /* Watchdog Disable */
84#define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */
85#define WD_PCI_WRSP 0x40 /* Watchdog wrote response */
86#define WD_PCI_PCMD 0x80 /* PC has sent command */
87
88/* according to documentation max. time to process a command for the pci
89 * watchdog card is 100 ms, so we give it 150 ms to do it's job */
90#define PCI_COMMAND_TIMEOUT 150
91
92/* Watchdog's internal commands */
93#define CMD_GET_STATUS 0x04
94#define CMD_GET_FIRMWARE_VERSION 0x08
95#define CMD_READ_WATCHDOG_TIMEOUT 0x18
96#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19
97#define CMD_GET_CLEAR_RESET_COUNT 0x84
98
99/* Watchdog's Dip Switch heartbeat values */
100static const int heartbeat_tbl[] = {
101 5, /* OFF-OFF-OFF = 5 Sec */
102 10, /* OFF-OFF-ON = 10 Sec */
103 30, /* OFF-ON-OFF = 30 Sec */
104 60, /* OFF-ON-ON = 1 Min */
105 300, /* ON-OFF-OFF = 5 Min */
106 600, /* ON-OFF-ON = 10 Min */
107 1800, /* ON-ON-OFF = 30 Min */
108 3600, /* ON-ON-ON = 1 hour */
109};
110
111/* We can only use 1 card due to the /dev/watchdog restriction */
112static int cards_found;
113
114/* internal variables */
115static int temp_panic;
116static unsigned long is_active;
117static char expect_release;
118/* this is private data for each PCI-PC watchdog card */
119static struct {
120 /* Wether or not the card has a temperature device */
121 int supports_temp;
122 /* The card's boot status */
123 int boot_status;
124 /* The cards I/O address */
125 unsigned long io_addr;
126 /* the lock for io operations */
127 spinlock_t io_lock;
128 /* the PCI-device */
129 struct pci_dev *pdev;
130} pcipcwd_private;
131
132/* module parameters */
133#define QUIET 0 /* Default */
134#define VERBOSE 1 /* Verbose */
135#define DEBUG 2 /* print fancy stuff too */
136static int debug = QUIET;
137module_param(debug, int, 0);
138MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
139
140#define WATCHDOG_HEARTBEAT 0 /* default heartbeat =
141 delay-time from dip-switches */
142static int heartbeat = WATCHDOG_HEARTBEAT;
143module_param(heartbeat, int, 0);
144MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
145 "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
146 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
147
148static int nowayout = WATCHDOG_NOWAYOUT;
149module_param(nowayout, int, 0);
150MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
151 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
152
153/*
154 * Internal functions
155 */
156
157static int send_command(int cmd, int *msb, int *lsb)
158{
159 int got_response, count;
160
161 if (debug >= DEBUG)
162 printk(KERN_DEBUG PFX "sending following data "
163 "cmd=0x%02x msb=0x%02x lsb=0x%02x\n", cmd, *msb, *lsb);
164
165 spin_lock(&pcipcwd_private.io_lock);
166 /* If a command requires data it should be written first.
167 * Data for commands with 8 bits of data should be written to port 4.
168 * Commands with 16 bits of data, should be written as LSB to port 4
169 * and MSB to port 5.
170 * After the required data has been written then write the command to
171 * port 6. */
172 outb_p(*lsb, pcipcwd_private.io_addr + 4);
173 outb_p(*msb, pcipcwd_private.io_addr + 5);
174 outb_p(cmd, pcipcwd_private.io_addr + 6);
175
176 /* wait till the pci card processed the command, signaled by
177 * the WRSP bit in port 2 and give it a max. timeout of
178 * PCI_COMMAND_TIMEOUT to process */
179 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
180 for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response);
181 count++) {
182 mdelay(1);
183 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
184 }
185
186 if (debug >= DEBUG) {
187 if (got_response) {
188 printk(KERN_DEBUG PFX
189 "time to process command was: %d ms\n",
190 count);
191 } else {
192 printk(KERN_DEBUG PFX
193 "card did not respond on command!\n");
194 }
195 }
196
197 if (got_response) {
198 /* read back response */
199 *lsb = inb_p(pcipcwd_private.io_addr + 4);
200 *msb = inb_p(pcipcwd_private.io_addr + 5);
201
202 /* clear WRSP bit */
203 inb_p(pcipcwd_private.io_addr + 6);
204
205 if (debug >= DEBUG)
206 printk(KERN_DEBUG PFX "received following data for "
207 "cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
208 cmd, *msb, *lsb);
209 }
210
211 spin_unlock(&pcipcwd_private.io_lock);
212
213 return got_response;
214}
215
216static inline void pcipcwd_check_temperature_support(void)
217{
218 if (inb_p(pcipcwd_private.io_addr) != 0xF0)
219 pcipcwd_private.supports_temp = 1;
220}
221
222static int pcipcwd_get_option_switches(void)
223{
224 int option_switches;
225
226 option_switches = inb_p(pcipcwd_private.io_addr + 3);
227 return option_switches;
228}
229
230static void pcipcwd_show_card_info(void)
231{
232 int got_fw_rev, fw_rev_major, fw_rev_minor;
233 char fw_ver_str[20]; /* The cards firmware version */
234 int option_switches;
235
236 got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major,
237 &fw_rev_minor);
238 if (got_fw_rev)
239 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
240 else
241 sprintf(fw_ver_str, "<card no answer>");
242
243 /* Get switch settings */
244 option_switches = pcipcwd_get_option_switches();
245
246 printk(KERN_INFO PFX "Found card at port "
247 "0x%04x (Firmware: %s) %s temp option\n",
248 (int) pcipcwd_private.io_addr, fw_ver_str,
249 (pcipcwd_private.supports_temp ? "with" : "without"));
250
251 printk(KERN_INFO PFX "Option switches (0x%02x): "
252 "Temperature Reset Enable=%s, Power On Delay=%s\n",
253 option_switches,
254 ((option_switches & 0x10) ? "ON" : "OFF"),
255 ((option_switches & 0x08) ? "ON" : "OFF"));
256
257 if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
258 printk(KERN_INFO PFX
259 "Previous reset was caused by the Watchdog card\n");
260
261 if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
262 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
263
264 if (pcipcwd_private.boot_status == 0)
265 printk(KERN_INFO PFX
266 "No previous trip detected - Cold boot or reset\n");
267}
268
269static int pcipcwd_start(void)
270{
271 int stat_reg;
272
273 spin_lock(&pcipcwd_private.io_lock);
274 outb_p(0x00, pcipcwd_private.io_addr + 3);
275 udelay(1000);
276
277 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
278 spin_unlock(&pcipcwd_private.io_lock);
279
280 if (stat_reg & WD_PCI_WDIS) {
281 printk(KERN_ERR PFX "Card timer not enabled\n");
282 return -1;
283 }
284
285 if (debug >= VERBOSE)
286 printk(KERN_DEBUG PFX "Watchdog started\n");
287
288 return 0;
289}
290
291static int pcipcwd_stop(void)
292{
293 int stat_reg;
294
295 spin_lock(&pcipcwd_private.io_lock);
296 outb_p(0xA5, pcipcwd_private.io_addr + 3);
297 udelay(1000);
298
299 outb_p(0xA5, pcipcwd_private.io_addr + 3);
300 udelay(1000);
301
302 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
303 spin_unlock(&pcipcwd_private.io_lock);
304
305 if (!(stat_reg & WD_PCI_WDIS)) {
306 printk(KERN_ERR PFX
307 "Card did not acknowledge disable attempt\n");
308 return -1;
309 }
310
311 if (debug >= VERBOSE)
312 printk(KERN_DEBUG PFX "Watchdog stopped\n");
313
314 return 0;
315}
316
317static int pcipcwd_keepalive(void)
318{
319 /* Re-trigger watchdog by writing to port 0 */
320 spin_lock(&pcipcwd_private.io_lock);
321 outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */
322 spin_unlock(&pcipcwd_private.io_lock);
323
324 if (debug >= DEBUG)
325 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
326
327 return 0;
328}
329
330static int pcipcwd_set_heartbeat(int t)
331{
332 int t_msb = t / 256;
333 int t_lsb = t % 256;
334
335 if ((t < 0x0001) || (t > 0xFFFF))
336 return -EINVAL;
337
338 /* Write new heartbeat to watchdog */
339 send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
340
341 heartbeat = t;
342 if (debug >= VERBOSE)
343 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
344 heartbeat);
345
346 return 0;
347}
348
349static int pcipcwd_get_status(int *status)
350{
351 int control_status;
352
353 *status = 0;
354 control_status = inb_p(pcipcwd_private.io_addr + 1);
355 if (control_status & WD_PCI_WTRP)
356 *status |= WDIOF_CARDRESET;
357 if (control_status & WD_PCI_TTRP) {
358 *status |= WDIOF_OVERHEAT;
359 if (temp_panic)
360 panic(PFX "Temperature overheat trip!\n");
361 }
362
363 if (debug >= DEBUG)
364 printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
365 control_status);
366
367 return 0;
368}
369
370static int pcipcwd_clear_status(void)
371{
372 int control_status;
373 int msb;
374 int reset_counter;
375
376 if (debug >= VERBOSE)
377 printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
378
379 control_status = inb_p(pcipcwd_private.io_addr + 1);
380
381 if (debug >= DEBUG) {
382 printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
383 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
384 (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
385 }
386
387 /* clear trip status & LED and keep mode of relay 2 */
388 outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP,
389 pcipcwd_private.io_addr + 1);
390
391 /* clear reset counter */
392 msb = 0;
393 reset_counter = 0xff;
394 send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
395
396 if (debug >= DEBUG) {
397 printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
398 reset_counter);
399 }
400
401 return 0;
402}
403
404static int pcipcwd_get_temperature(int *temperature)
405{
406 *temperature = 0;
407 if (!pcipcwd_private.supports_temp)
408 return -ENODEV;
409
410 spin_lock(&pcipcwd_private.io_lock);
411 *temperature = inb_p(pcipcwd_private.io_addr);
412 spin_unlock(&pcipcwd_private.io_lock);
413
414 /*
415 * Convert celsius to fahrenheit, since this was
416 * the decided 'standard' for this return value.
417 */
418 *temperature = (*temperature * 9 / 5) + 32;
419
420 if (debug >= DEBUG) {
421 printk(KERN_DEBUG PFX "temperature is: %d F\n",
422 *temperature);
423 }
424
425 return 0;
426}
427
428static int pcipcwd_get_timeleft(int *time_left)
429{
430 int msb;
431 int lsb;
432
433 /* Read the time that's left before rebooting */
434 /* Note: if the board is not yet armed then we will read 0xFFFF */
435 send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
436
437 *time_left = (msb << 8) + lsb;
438
439 if (debug >= VERBOSE)
440 printk(KERN_DEBUG PFX "Time left before next reboot: %d\n",
441 *time_left);
442
443 return 0;
444}
445
446/*
447 * /dev/watchdog handling
448 */
449
450static ssize_t pcipcwd_write(struct file *file, const char __user *data,
451 size_t len, loff_t *ppos)
452{
453 /* See if we got the magic character 'V' and reload the timer */
454 if (len) {
455 if (!nowayout) {
456 size_t i;
457
458 /* note: just in case someone wrote the magic character
459 * five months ago... */
460 expect_release = 0;
461
462 /* scan to see whether or not we got the
463 * magic character */
464 for (i = 0; i != len; i++) {
465 char c;
466 if (get_user(c, data + i))
467 return -EFAULT;
468 if (c == 'V')
469 expect_release = 42;
470 }
471 }
472
473 /* someone wrote to us, we should reload the timer */
474 pcipcwd_keepalive();
475 }
476 return len;
477}
478
479static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
480 unsigned long arg)
481{
482 void __user *argp = (void __user *)arg;
483 int __user *p = argp;
484 static const struct watchdog_info ident = {
485 .options = WDIOF_OVERHEAT |
486 WDIOF_CARDRESET |
487 WDIOF_KEEPALIVEPING |
488 WDIOF_SETTIMEOUT |
489 WDIOF_MAGICCLOSE,
490 .firmware_version = 1,
491 .identity = WATCHDOG_DRIVER_NAME,
492 };
493
494 switch (cmd) {
495 case WDIOC_GETSUPPORT:
496 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
497
498 case WDIOC_GETSTATUS:
499 {
500 int status;
501 pcipcwd_get_status(&status);
502 return put_user(status, p);
503 }
504
505 case WDIOC_GETBOOTSTATUS:
506 return put_user(pcipcwd_private.boot_status, p);
507
508 case WDIOC_GETTEMP:
509 {
510 int temperature;
511
512 if (pcipcwd_get_temperature(&temperature))
513 return -EFAULT;
514
515 return put_user(temperature, p);
516 }
517
518 case WDIOC_SETOPTIONS:
519 {
520 int new_options, retval = -EINVAL;
521
522 if (get_user(new_options, p))
523 return -EFAULT;
524
525 if (new_options & WDIOS_DISABLECARD) {
526 if (pcipcwd_stop())
527 return -EIO;
528 retval = 0;
529 }
530
531 if (new_options & WDIOS_ENABLECARD) {
532 if (pcipcwd_start())
533 return -EIO;
534 retval = 0;
535 }
536
537 if (new_options & WDIOS_TEMPPANIC) {
538 temp_panic = 1;
539 retval = 0;
540 }
541
542 return retval;
543 }
544
545 case WDIOC_KEEPALIVE:
546 pcipcwd_keepalive();
547 return 0;
548
549 case WDIOC_SETTIMEOUT:
550 {
551 int new_heartbeat;
552
553 if (get_user(new_heartbeat, p))
554 return -EFAULT;
555
556 if (pcipcwd_set_heartbeat(new_heartbeat))
557 return -EINVAL;
558
559 pcipcwd_keepalive();
560 /* Fall */
561 }
562
563 case WDIOC_GETTIMEOUT:
564 return put_user(heartbeat, p);
565
566 case WDIOC_GETTIMELEFT:
567 {
568 int time_left;
569
570 if (pcipcwd_get_timeleft(&time_left))
571 return -EFAULT;
572
573 return put_user(time_left, p);
574 }
575
576 default:
577 return -ENOTTY;
578 }
579}
580
581static int pcipcwd_open(struct inode *inode, struct file *file)
582{
583 /* /dev/watchdog can only be opened once */
584 if (test_and_set_bit(0, &is_active)) {
585 if (debug >= VERBOSE)
586 printk(KERN_ERR PFX
587 "Attempt to open already opened device.\n");
588 return -EBUSY;
589 }
590
591 /* Activate */
592 pcipcwd_start();
593 pcipcwd_keepalive();
594 return nonseekable_open(inode, file);
595}
596
597static int pcipcwd_release(struct inode *inode, struct file *file)
598{
599 /*
600 * Shut off the timer.
601 */
602 if (expect_release == 42) {
603 pcipcwd_stop();
604 } else {
605 printk(KERN_CRIT PFX
606 "Unexpected close, not stopping watchdog!\n");
607 pcipcwd_keepalive();
608 }
609 expect_release = 0;
610 clear_bit(0, &is_active);
611 return 0;
612}
613
614/*
615 * /dev/temperature handling
616 */
617
618static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
619 size_t len, loff_t *ppos)
620{
621 int temperature;
622
623 if (pcipcwd_get_temperature(&temperature))
624 return -EFAULT;
625
626 if (copy_to_user(data, &temperature, 1))
627 return -EFAULT;
628
629 return 1;
630}
631
632static int pcipcwd_temp_open(struct inode *inode, struct file *file)
633{
634 if (!pcipcwd_private.supports_temp)
635 return -ENODEV;
636
637 return nonseekable_open(inode, file);
638}
639
640static int pcipcwd_temp_release(struct inode *inode, struct file *file)
641{
642 return 0;
643}
644
645/*
646 * Notify system
647 */
648
649static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code,
650 void *unused)
651{
652 if (code == SYS_DOWN || code == SYS_HALT)
653 pcipcwd_stop(); /* Turn the WDT off */
654
655 return NOTIFY_DONE;
656}
657
658/*
659 * Kernel Interfaces
660 */
661
662static const struct file_operations pcipcwd_fops = {
663 .owner = THIS_MODULE,
664 .llseek = no_llseek,
665 .write = pcipcwd_write,
666 .unlocked_ioctl = pcipcwd_ioctl,
667 .open = pcipcwd_open,
668 .release = pcipcwd_release,
669};
670
671static struct miscdevice pcipcwd_miscdev = {
672 .minor = WATCHDOG_MINOR,
673 .name = "watchdog",
674 .fops = &pcipcwd_fops,
675};
676
677static const struct file_operations pcipcwd_temp_fops = {
678 .owner = THIS_MODULE,
679 .llseek = no_llseek,
680 .read = pcipcwd_temp_read,
681 .open = pcipcwd_temp_open,
682 .release = pcipcwd_temp_release,
683};
684
685static struct miscdevice pcipcwd_temp_miscdev = {
686 .minor = TEMP_MINOR,
687 .name = "temperature",
688 .fops = &pcipcwd_temp_fops,
689};
690
691static struct notifier_block pcipcwd_notifier = {
692 .notifier_call = pcipcwd_notify_sys,
693};
694
695/*
696 * Init & exit routines
697 */
698
699static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
700 const struct pci_device_id *ent)
701{
702 int ret = -EIO;
703
704 cards_found++;
705 if (cards_found == 1)
706 printk(KERN_INFO PFX DRIVER_VERSION);
707
708 if (cards_found > 1) {
709 printk(KERN_ERR PFX "This driver only supports 1 device\n");
710 return -ENODEV;
711 }
712
713 if (pci_enable_device(pdev)) {
714 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
715 return -ENODEV;
716 }
717
718 if (pci_resource_start(pdev, 0) == 0x0000) {
719 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
720 ret = -ENODEV;
721 goto err_out_disable_device;
722 }
723
724 pcipcwd_private.pdev = pdev;
725 pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
726
727 if (pci_request_regions(pdev, WATCHDOG_NAME)) {
728 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
729 (int) pcipcwd_private.io_addr);
730 ret = -EIO;
731 goto err_out_disable_device;
732 }
733
734 /* get the boot_status */
735 pcipcwd_get_status(&pcipcwd_private.boot_status);
736
737 /* clear the "card caused reboot" flag */
738 pcipcwd_clear_status();
739
740 /* disable card */
741 pcipcwd_stop();
742
743 /* Check whether or not the card supports the temperature device */
744 pcipcwd_check_temperature_support();
745
746 /* Show info about the card itself */
747 pcipcwd_show_card_info();
748
749 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
750 if (heartbeat == 0)
751 heartbeat =
752 heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
753
754 /* Check that the heartbeat value is within it's range ;
755 * if not reset to the default */
756 if (pcipcwd_set_heartbeat(heartbeat)) {
757 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
758 printk(KERN_INFO PFX
759 "heartbeat value must be 0<heartbeat<65536, using %d\n",
760 WATCHDOG_HEARTBEAT);
761 }
762
763 ret = register_reboot_notifier(&pcipcwd_notifier);
764 if (ret != 0) {
765 printk(KERN_ERR PFX
766 "cannot register reboot notifier (err=%d)\n", ret);
767 goto err_out_release_region;
768 }
769
770 if (pcipcwd_private.supports_temp) {
771 ret = misc_register(&pcipcwd_temp_miscdev);
772 if (ret != 0) {
773 printk(KERN_ERR PFX "cannot register miscdev on "
774 "minor=%d (err=%d)\n", TEMP_MINOR, ret);
775 goto err_out_unregister_reboot;
776 }
777 }
778
779 ret = misc_register(&pcipcwd_miscdev);
780 if (ret != 0) {
781 printk(KERN_ERR PFX
782 "cannot register miscdev on minor=%d (err=%d)\n",
783 WATCHDOG_MINOR, ret);
784 goto err_out_misc_deregister;
785 }
786
787 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
788 heartbeat, nowayout);
789
790 return 0;
791
792err_out_misc_deregister:
793 if (pcipcwd_private.supports_temp)
794 misc_deregister(&pcipcwd_temp_miscdev);
795err_out_unregister_reboot:
796 unregister_reboot_notifier(&pcipcwd_notifier);
797err_out_release_region:
798 pci_release_regions(pdev);
799err_out_disable_device:
800 pci_disable_device(pdev);
801 return ret;
802}
803
804static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
805{
806 /* Stop the timer before we leave */
807 if (!nowayout)
808 pcipcwd_stop();
809
810 /* Deregister */
811 misc_deregister(&pcipcwd_miscdev);
812 if (pcipcwd_private.supports_temp)
813 misc_deregister(&pcipcwd_temp_miscdev);
814 unregister_reboot_notifier(&pcipcwd_notifier);
815 pci_release_regions(pdev);
816 pci_disable_device(pdev);
817 cards_found--;
818}
819
820static DEFINE_PCI_DEVICE_TABLE(pcipcwd_pci_tbl) = {
821 { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
822 PCI_ANY_ID, PCI_ANY_ID, },
823 { 0 }, /* End of list */
824};
825MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
826
827static struct pci_driver pcipcwd_driver = {
828 .name = WATCHDOG_NAME,
829 .id_table = pcipcwd_pci_tbl,
830 .probe = pcipcwd_card_init,
831 .remove = __devexit_p(pcipcwd_card_exit),
832};
833
834static int __init pcipcwd_init_module(void)
835{
836 spin_lock_init(&pcipcwd_private.io_lock);
837
838 return pci_register_driver(&pcipcwd_driver);
839}
840
841static void __exit pcipcwd_cleanup_module(void)
842{
843 pci_unregister_driver(&pcipcwd_driver);
844
845 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
846}
847
848module_init(pcipcwd_init_module);
849module_exit(pcipcwd_cleanup_module);
850
851MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
852MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
853MODULE_LICENSE("GPL");
854MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
855MODULE_ALIAS_MISCDEV(TEMP_MINOR);