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35
36#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
37
38#include <linux/interrupt.h>
39#include <linux/module.h>
40#include <linux/moduleparam.h>
41#include <linux/types.h>
42#include <linux/miscdevice.h>
43#include <linux/watchdog.h>
44#include <linux/ioport.h>
45#include <linux/delay.h>
46#include <linux/notifier.h>
47#include <linux/reboot.h>
48#include <linux/fs.h>
49#include <linux/pci.h>
50#include <linux/io.h>
51#include <linux/uaccess.h>
52
53
54#define WDT_IS_PCI
55#include "wd501p.h"
56
57
58static int dev_count;
59
60static unsigned long open_lock;
61static DEFINE_SPINLOCK(wdtpci_lock);
62static char expect_close;
63
64static resource_size_t io;
65static int irq;
66
67
68#define WD_TIMO 60
69
70static int heartbeat = WD_TIMO;
71static int wd_heartbeat;
72module_param(heartbeat, int, 0);
73MODULE_PARM_DESC(heartbeat,
74 "Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
75 __MODULE_STRING(WD_TIMO) ")");
76
77static bool nowayout = WATCHDOG_NOWAYOUT;
78module_param(nowayout, bool, 0);
79MODULE_PARM_DESC(nowayout,
80 "Watchdog cannot be stopped once started (default="
81 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
82
83
84static int tachometer;
85module_param(tachometer, int, 0);
86MODULE_PARM_DESC(tachometer,
87 "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
88
89static int type = 500;
90module_param(type, int, 0);
91MODULE_PARM_DESC(type,
92 "PCI-WDT501 Card type (500 or 501 , default=500)");
93
94
95
96
97
98static void wdtpci_ctr_mode(int ctr, int mode)
99{
100 ctr <<= 6;
101 ctr |= 0x30;
102 ctr |= (mode << 1);
103 outb(ctr, WDT_CR);
104 udelay(8);
105}
106
107static void wdtpci_ctr_load(int ctr, int val)
108{
109 outb(val & 0xFF, WDT_COUNT0 + ctr);
110 udelay(8);
111 outb(val >> 8, WDT_COUNT0 + ctr);
112 udelay(8);
113}
114
115
116
117
118
119
120
121static int wdtpci_start(void)
122{
123 unsigned long flags;
124
125 spin_lock_irqsave(&wdtpci_lock, flags);
126
127
128
129
130
131 inb(WDT_DC);
132 udelay(8);
133 wdtpci_ctr_mode(2, 0);
134
135 outb(0, WDT_DC);
136 udelay(8);
137 inb(WDT_DC);
138 udelay(8);
139 outb(0, WDT_CLOCK);
140 udelay(8);
141 inb(WDT_BUZZER);
142 udelay(8);
143 inb(WDT_OPTONOTRST);
144 udelay(8);
145 inb(WDT_OPTORST);
146 udelay(8);
147 inb(WDT_PROGOUT);
148 udelay(8);
149 wdtpci_ctr_mode(0, 3);
150
151 wdtpci_ctr_mode(1, 2);
152
153 wdtpci_ctr_mode(2, 1);
154
155 wdtpci_ctr_load(0, 20833);
156 wdtpci_ctr_load(1, wd_heartbeat);
157
158 outb(0, WDT_DC);
159 udelay(8);
160
161 spin_unlock_irqrestore(&wdtpci_lock, flags);
162 return 0;
163}
164
165
166
167
168
169
170
171static int wdtpci_stop(void)
172{
173 unsigned long flags;
174
175
176 spin_lock_irqsave(&wdtpci_lock, flags);
177 inb(WDT_DC);
178 udelay(8);
179 wdtpci_ctr_load(2, 0);
180 spin_unlock_irqrestore(&wdtpci_lock, flags);
181 return 0;
182}
183
184
185
186
187
188
189
190
191static int wdtpci_ping(void)
192{
193 unsigned long flags;
194
195 spin_lock_irqsave(&wdtpci_lock, flags);
196
197 inb(WDT_DC);
198 udelay(8);
199 wdtpci_ctr_mode(1, 2);
200
201 wdtpci_ctr_load(1, wd_heartbeat);
202 outb(0, WDT_DC);
203 udelay(8);
204 spin_unlock_irqrestore(&wdtpci_lock, flags);
205 return 0;
206}
207
208
209
210
211
212
213
214
215
216static int wdtpci_set_heartbeat(int t)
217{
218
219 if (t < 1 || t > 65535)
220 return -EINVAL;
221
222 heartbeat = t;
223 wd_heartbeat = t * 100;
224 return 0;
225}
226
227
228
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230
231
232
233
234
235
236
237
238static int wdtpci_get_status(int *status)
239{
240 unsigned char new_status;
241 unsigned long flags;
242
243 spin_lock_irqsave(&wdtpci_lock, flags);
244 new_status = inb(WDT_SR);
245 spin_unlock_irqrestore(&wdtpci_lock, flags);
246
247 *status = 0;
248 if (new_status & WDC_SR_ISOI0)
249 *status |= WDIOF_EXTERN1;
250 if (new_status & WDC_SR_ISII1)
251 *status |= WDIOF_EXTERN2;
252 if (type == 501) {
253 if (!(new_status & WDC_SR_TGOOD))
254 *status |= WDIOF_OVERHEAT;
255 if (!(new_status & WDC_SR_PSUOVER))
256 *status |= WDIOF_POWEROVER;
257 if (!(new_status & WDC_SR_PSUUNDR))
258 *status |= WDIOF_POWERUNDER;
259 if (tachometer) {
260 if (!(new_status & WDC_SR_FANGOOD))
261 *status |= WDIOF_FANFAULT;
262 }
263 }
264 return 0;
265}
266
267
268
269
270
271
272
273
274static int wdtpci_get_temperature(int *temperature)
275{
276 unsigned short c;
277 unsigned long flags;
278 spin_lock_irqsave(&wdtpci_lock, flags);
279 c = inb(WDT_RT);
280 udelay(8);
281 spin_unlock_irqrestore(&wdtpci_lock, flags);
282 *temperature = (c * 11 / 15) + 7;
283 return 0;
284}
285
286
287
288
289
290
291
292
293
294
295
296static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
297{
298
299
300
301
302 unsigned char status;
303
304 spin_lock(&wdtpci_lock);
305
306 status = inb(WDT_SR);
307 udelay(8);
308
309 pr_crit("status %d\n", status);
310
311 if (type == 501) {
312 if (!(status & WDC_SR_TGOOD)) {
313 pr_crit("Overheat alarm (%d)\n", inb(WDT_RT));
314 udelay(8);
315 }
316 if (!(status & WDC_SR_PSUOVER))
317 pr_crit("PSU over voltage\n");
318 if (!(status & WDC_SR_PSUUNDR))
319 pr_crit("PSU under voltage\n");
320 if (tachometer) {
321 if (!(status & WDC_SR_FANGOOD))
322 pr_crit("Possible fan fault\n");
323 }
324 }
325 if (!(status & WDC_SR_WCCR)) {
326#ifdef SOFTWARE_REBOOT
327#ifdef ONLY_TESTING
328 pr_crit("Would Reboot\n");
329#else
330 pr_crit("Initiating system reboot\n");
331 emergency_restart();
332#endif
333#else
334 pr_crit("Reset in 5ms\n");
335#endif
336 }
337 spin_unlock(&wdtpci_lock);
338 return IRQ_HANDLED;
339}
340
341
342
343
344
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350
351
352
353static ssize_t wdtpci_write(struct file *file, const char __user *buf,
354 size_t count, loff_t *ppos)
355{
356 if (count) {
357 if (!nowayout) {
358 size_t i;
359
360
361 expect_close = 0;
362
363 for (i = 0; i != count; i++) {
364 char c;
365 if (get_user(c, buf + i))
366 return -EFAULT;
367 if (c == 'V')
368 expect_close = 42;
369 }
370 }
371 wdtpci_ping();
372 }
373 return count;
374}
375
376
377
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379
380
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382
383
384
385
386
387static long wdtpci_ioctl(struct file *file, unsigned int cmd,
388 unsigned long arg)
389{
390 void __user *argp = (void __user *)arg;
391 int __user *p = argp;
392 int new_heartbeat;
393 int status;
394
395 struct watchdog_info ident = {
396 .options = WDIOF_SETTIMEOUT|
397 WDIOF_MAGICCLOSE|
398 WDIOF_KEEPALIVEPING,
399 .firmware_version = 1,
400 .identity = "PCI-WDT500/501",
401 };
402
403
404 ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
405 if (type == 501) {
406 ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
407 WDIOF_POWEROVER);
408 if (tachometer)
409 ident.options |= WDIOF_FANFAULT;
410 }
411
412 switch (cmd) {
413 case WDIOC_GETSUPPORT:
414 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
415 case WDIOC_GETSTATUS:
416 wdtpci_get_status(&status);
417 return put_user(status, p);
418 case WDIOC_GETBOOTSTATUS:
419 return put_user(0, p);
420 case WDIOC_KEEPALIVE:
421 wdtpci_ping();
422 return 0;
423 case WDIOC_SETTIMEOUT:
424 if (get_user(new_heartbeat, p))
425 return -EFAULT;
426 if (wdtpci_set_heartbeat(new_heartbeat))
427 return -EINVAL;
428 wdtpci_ping();
429 fallthrough;
430 case WDIOC_GETTIMEOUT:
431 return put_user(heartbeat, p);
432 default:
433 return -ENOTTY;
434 }
435}
436
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447
448
449static int wdtpci_open(struct inode *inode, struct file *file)
450{
451 if (test_and_set_bit(0, &open_lock))
452 return -EBUSY;
453
454 if (nowayout)
455 __module_get(THIS_MODULE);
456
457
458
459 wdtpci_start();
460 return stream_open(inode, file);
461}
462
463
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473
474
475static int wdtpci_release(struct inode *inode, struct file *file)
476{
477 if (expect_close == 42) {
478 wdtpci_stop();
479 } else {
480 pr_crit("Unexpected close, not stopping timer!\n");
481 wdtpci_ping();
482 }
483 expect_close = 0;
484 clear_bit(0, &open_lock);
485 return 0;
486}
487
488
489
490
491
492
493
494
495
496
497
498
499static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
500 size_t count, loff_t *ptr)
501{
502 int temperature;
503
504 if (wdtpci_get_temperature(&temperature))
505 return -EFAULT;
506
507 if (copy_to_user(buf, &temperature, 1))
508 return -EFAULT;
509
510 return 1;
511}
512
513
514
515
516
517
518
519
520
521static int wdtpci_temp_open(struct inode *inode, struct file *file)
522{
523 return stream_open(inode, file);
524}
525
526
527
528
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530
531
532
533
534static int wdtpci_temp_release(struct inode *inode, struct file *file)
535{
536 return 0;
537}
538
539
540
541
542
543
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548
549
550
551static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
552 void *unused)
553{
554 if (code == SYS_DOWN || code == SYS_HALT)
555 wdtpci_stop();
556 return NOTIFY_DONE;
557}
558
559
560
561
562
563
564static const struct file_operations wdtpci_fops = {
565 .owner = THIS_MODULE,
566 .llseek = no_llseek,
567 .write = wdtpci_write,
568 .unlocked_ioctl = wdtpci_ioctl,
569 .compat_ioctl = compat_ptr_ioctl,
570 .open = wdtpci_open,
571 .release = wdtpci_release,
572};
573
574static struct miscdevice wdtpci_miscdev = {
575 .minor = WATCHDOG_MINOR,
576 .name = "watchdog",
577 .fops = &wdtpci_fops,
578};
579
580static const struct file_operations wdtpci_temp_fops = {
581 .owner = THIS_MODULE,
582 .llseek = no_llseek,
583 .read = wdtpci_temp_read,
584 .open = wdtpci_temp_open,
585 .release = wdtpci_temp_release,
586};
587
588static struct miscdevice temp_miscdev = {
589 .minor = TEMP_MINOR,
590 .name = "temperature",
591 .fops = &wdtpci_temp_fops,
592};
593
594
595
596
597
598
599static struct notifier_block wdtpci_notifier = {
600 .notifier_call = wdtpci_notify_sys,
601};
602
603
604static int wdtpci_init_one(struct pci_dev *dev,
605 const struct pci_device_id *ent)
606{
607 int ret = -EIO;
608
609 dev_count++;
610 if (dev_count > 1) {
611 pr_err("This driver only supports one device\n");
612 return -ENODEV;
613 }
614
615 if (type != 500 && type != 501) {
616 pr_err("unknown card type '%d'\n", type);
617 return -ENODEV;
618 }
619
620 if (pci_enable_device(dev)) {
621 pr_err("Not possible to enable PCI Device\n");
622 return -ENODEV;
623 }
624
625 if (pci_resource_start(dev, 2) == 0x0000) {
626 pr_err("No I/O-Address for card detected\n");
627 ret = -ENODEV;
628 goto out_pci;
629 }
630
631 if (pci_request_region(dev, 2, "wdt_pci")) {
632 pr_err("I/O address 0x%llx already in use\n",
633 (unsigned long long)pci_resource_start(dev, 2));
634 goto out_pci;
635 }
636
637 irq = dev->irq;
638 io = pci_resource_start(dev, 2);
639
640 if (request_irq(irq, wdtpci_interrupt, IRQF_SHARED,
641 "wdt_pci", &wdtpci_miscdev)) {
642 pr_err("IRQ %d is not free\n", irq);
643 goto out_reg;
644 }
645
646 pr_info("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n",
647 (unsigned long long)io, irq);
648
649
650
651 if (wdtpci_set_heartbeat(heartbeat)) {
652 wdtpci_set_heartbeat(WD_TIMO);
653 pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n",
654 WD_TIMO);
655 }
656
657 ret = register_reboot_notifier(&wdtpci_notifier);
658 if (ret) {
659 pr_err("cannot register reboot notifier (err=%d)\n", ret);
660 goto out_irq;
661 }
662
663 if (type == 501) {
664 ret = misc_register(&temp_miscdev);
665 if (ret) {
666 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
667 TEMP_MINOR, ret);
668 goto out_rbt;
669 }
670 }
671
672 ret = misc_register(&wdtpci_miscdev);
673 if (ret) {
674 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
675 WATCHDOG_MINOR, ret);
676 goto out_misc;
677 }
678
679 pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
680 heartbeat, nowayout);
681 if (type == 501)
682 pr_info("Fan Tachometer is %s\n",
683 tachometer ? "Enabled" : "Disabled");
684
685 ret = 0;
686out:
687 return ret;
688
689out_misc:
690 if (type == 501)
691 misc_deregister(&temp_miscdev);
692out_rbt:
693 unregister_reboot_notifier(&wdtpci_notifier);
694out_irq:
695 free_irq(irq, &wdtpci_miscdev);
696out_reg:
697 pci_release_region(dev, 2);
698out_pci:
699 pci_disable_device(dev);
700 goto out;
701}
702
703
704static void wdtpci_remove_one(struct pci_dev *pdev)
705{
706
707
708 misc_deregister(&wdtpci_miscdev);
709 if (type == 501)
710 misc_deregister(&temp_miscdev);
711 unregister_reboot_notifier(&wdtpci_notifier);
712 free_irq(irq, &wdtpci_miscdev);
713 pci_release_region(pdev, 2);
714 pci_disable_device(pdev);
715 dev_count--;
716}
717
718
719static const struct pci_device_id wdtpci_pci_tbl[] = {
720 {
721 .vendor = PCI_VENDOR_ID_ACCESSIO,
722 .device = PCI_DEVICE_ID_ACCESSIO_WDG_CSM,
723 .subvendor = PCI_ANY_ID,
724 .subdevice = PCI_ANY_ID,
725 },
726 { 0, },
727};
728MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
729
730
731static struct pci_driver wdtpci_driver = {
732 .name = "wdt_pci",
733 .id_table = wdtpci_pci_tbl,
734 .probe = wdtpci_init_one,
735 .remove = wdtpci_remove_one,
736};
737
738module_pci_driver(wdtpci_driver);
739
740MODULE_AUTHOR("JP Nollmann, Alan Cox");
741MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
742MODULE_LICENSE("GPL");
743