Root/drivers/watchdog/wdt_pci.c

1/*
2 * Industrial Computer Source PCI-WDT500/501 driver
3 *
4 * (c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
5 * All Rights Reserved.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
12 * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
13 * warranty for any of this software. This material is provided
14 * "AS-IS" and at no charge.
15 *
16 * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
17 *
18 * Release 0.10.
19 *
20 * Fixes
21 * Dave Gregorich : Modularisation and minor bugs
22 * Alan Cox : Added the watchdog ioctl() stuff
23 * Alan Cox : Fixed the reboot problem (as noted by
24 * Matt Crocker).
25 * Alan Cox : Added wdt= boot option
26 * Alan Cox : Cleaned up copy/user stuff
27 * Tim Hockin : Added insmod parameters, comment cleanup
28 * Parameterized timeout
29 * JP Nollmann : Added support for PCI wdt501p
30 * Alan Cox : Split ISA and PCI cards into two drivers
31 * Jeff Garzik : PCI cleanups
32 * Tigran Aivazian : Restructured wdtpci_init_one() to handle
33 * failures
34 * Joel Becker : Added WDIOC_GET/SETTIMEOUT
35 * Zwane Mwaikambo : Magic char closing, locking changes,
36 * cleanups
37 * Matt Domsch : nowayout module option
38 */
39
40#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
41
42#include <linux/interrupt.h>
43#include <linux/module.h>
44#include <linux/moduleparam.h>
45#include <linux/types.h>
46#include <linux/miscdevice.h>
47#include <linux/watchdog.h>
48#include <linux/ioport.h>
49#include <linux/delay.h>
50#include <linux/notifier.h>
51#include <linux/reboot.h>
52#include <linux/init.h>
53#include <linux/fs.h>
54#include <linux/pci.h>
55#include <linux/io.h>
56#include <linux/uaccess.h>
57
58
59#define WDT_IS_PCI
60#include "wd501p.h"
61
62/* We can only use 1 card due to the /dev/watchdog restriction */
63static int dev_count;
64
65static unsigned long open_lock;
66static DEFINE_SPINLOCK(wdtpci_lock);
67static char expect_close;
68
69static resource_size_t io;
70static int irq;
71
72/* Default timeout */
73#define WD_TIMO 60 /* Default heartbeat = 60 seconds */
74
75static int heartbeat = WD_TIMO;
76static int wd_heartbeat;
77module_param(heartbeat, int, 0);
78MODULE_PARM_DESC(heartbeat,
79        "Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
80                __MODULE_STRING(WD_TIMO) ")");
81
82static bool nowayout = WATCHDOG_NOWAYOUT;
83module_param(nowayout, bool, 0);
84MODULE_PARM_DESC(nowayout,
85        "Watchdog cannot be stopped once started (default="
86                __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
87
88/* Support for the Fan Tachometer on the PCI-WDT501 */
89static int tachometer;
90module_param(tachometer, int, 0);
91MODULE_PARM_DESC(tachometer,
92        "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
93
94static int type = 500;
95module_param(type, int, 0);
96MODULE_PARM_DESC(type,
97        "PCI-WDT501 Card type (500 or 501 , default=500)");
98
99/*
100 * Programming support
101 */
102
103static void wdtpci_ctr_mode(int ctr, int mode)
104{
105    ctr <<= 6;
106    ctr |= 0x30;
107    ctr |= (mode << 1);
108    outb(ctr, WDT_CR);
109    udelay(8);
110}
111
112static void wdtpci_ctr_load(int ctr, int val)
113{
114    outb(val & 0xFF, WDT_COUNT0 + ctr);
115    udelay(8);
116    outb(val >> 8, WDT_COUNT0 + ctr);
117    udelay(8);
118}
119
120/**
121 * wdtpci_start:
122 *
123 * Start the watchdog driver.
124 */
125
126static int wdtpci_start(void)
127{
128    unsigned long flags;
129
130    spin_lock_irqsave(&wdtpci_lock, flags);
131
132    /*
133     * "pet" the watchdog, as Access says.
134     * This resets the clock outputs.
135     */
136    inb(WDT_DC); /* Disable watchdog */
137    udelay(8);
138    wdtpci_ctr_mode(2, 0); /* Program CTR2 for Mode 0:
139                        Pulse on Terminal Count */
140    outb(0, WDT_DC); /* Enable watchdog */
141    udelay(8);
142    inb(WDT_DC); /* Disable watchdog */
143    udelay(8);
144    outb(0, WDT_CLOCK); /* 2.0833MHz clock */
145    udelay(8);
146    inb(WDT_BUZZER); /* disable */
147    udelay(8);
148    inb(WDT_OPTONOTRST); /* disable */
149    udelay(8);
150    inb(WDT_OPTORST); /* disable */
151    udelay(8);
152    inb(WDT_PROGOUT); /* disable */
153    udelay(8);
154    wdtpci_ctr_mode(0, 3); /* Program CTR0 for Mode 3:
155                        Square Wave Generator */
156    wdtpci_ctr_mode(1, 2); /* Program CTR1 for Mode 2:
157                        Rate Generator */
158    wdtpci_ctr_mode(2, 1); /* Program CTR2 for Mode 1:
159                        Retriggerable One-Shot */
160    wdtpci_ctr_load(0, 20833); /* count at 100Hz */
161    wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
162    /* DO NOT LOAD CTR2 on PCI card! -- JPN */
163    outb(0, WDT_DC); /* Enable watchdog */
164    udelay(8);
165
166    spin_unlock_irqrestore(&wdtpci_lock, flags);
167    return 0;
168}
169
170/**
171 * wdtpci_stop:
172 *
173 * Stop the watchdog driver.
174 */
175
176static int wdtpci_stop(void)
177{
178    unsigned long flags;
179
180    /* Turn the card off */
181    spin_lock_irqsave(&wdtpci_lock, flags);
182    inb(WDT_DC); /* Disable watchdog */
183    udelay(8);
184    wdtpci_ctr_load(2, 0); /* 0 length reset pulses now */
185    spin_unlock_irqrestore(&wdtpci_lock, flags);
186    return 0;
187}
188
189/**
190 * wdtpci_ping:
191 *
192 * Reload counter one with the watchdog heartbeat. We don't bother
193 * reloading the cascade counter.
194 */
195
196static int wdtpci_ping(void)
197{
198    unsigned long flags;
199
200    spin_lock_irqsave(&wdtpci_lock, flags);
201    /* Write a watchdog value */
202    inb(WDT_DC); /* Disable watchdog */
203    udelay(8);
204    wdtpci_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2:
205                            Rate Generator */
206    wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
207    outb(0, WDT_DC); /* Enable watchdog */
208    udelay(8);
209    spin_unlock_irqrestore(&wdtpci_lock, flags);
210    return 0;
211}
212
213/**
214 * wdtpci_set_heartbeat:
215 * @t: the new heartbeat value that needs to be set.
216 *
217 * Set a new heartbeat value for the watchdog device. If the heartbeat
218 * value is incorrect we keep the old value and return -EINVAL.
219 * If successful we return 0.
220 */
221static int wdtpci_set_heartbeat(int t)
222{
223    /* Arbitrary, can't find the card's limits */
224    if (t < 1 || t > 65535)
225        return -EINVAL;
226
227    heartbeat = t;
228    wd_heartbeat = t * 100;
229    return 0;
230}
231
232/**
233 * wdtpci_get_status:
234 * @status: the new status.
235 *
236 * Extract the status information from a WDT watchdog device. There are
237 * several board variants so we have to know which bits are valid. Some
238 * bits default to one and some to zero in order to be maximally painful.
239 *
240 * we then map the bits onto the status ioctl flags.
241 */
242
243static int wdtpci_get_status(int *status)
244{
245    unsigned char new_status;
246    unsigned long flags;
247
248    spin_lock_irqsave(&wdtpci_lock, flags);
249    new_status = inb(WDT_SR);
250    spin_unlock_irqrestore(&wdtpci_lock, flags);
251
252    *status = 0;
253    if (new_status & WDC_SR_ISOI0)
254        *status |= WDIOF_EXTERN1;
255    if (new_status & WDC_SR_ISII1)
256        *status |= WDIOF_EXTERN2;
257    if (type == 501) {
258        if (!(new_status & WDC_SR_TGOOD))
259            *status |= WDIOF_OVERHEAT;
260        if (!(new_status & WDC_SR_PSUOVER))
261            *status |= WDIOF_POWEROVER;
262        if (!(new_status & WDC_SR_PSUUNDR))
263            *status |= WDIOF_POWERUNDER;
264        if (tachometer) {
265            if (!(new_status & WDC_SR_FANGOOD))
266                *status |= WDIOF_FANFAULT;
267        }
268    }
269    return 0;
270}
271
272/**
273 * wdtpci_get_temperature:
274 *
275 * Reports the temperature in degrees Fahrenheit. The API is in
276 * farenheit. It was designed by an imperial measurement luddite.
277 */
278
279static int wdtpci_get_temperature(int *temperature)
280{
281    unsigned short c;
282    unsigned long flags;
283    spin_lock_irqsave(&wdtpci_lock, flags);
284    c = inb(WDT_RT);
285    udelay(8);
286    spin_unlock_irqrestore(&wdtpci_lock, flags);
287    *temperature = (c * 11 / 15) + 7;
288    return 0;
289}
290
291/**
292 * wdtpci_interrupt:
293 * @irq: Interrupt number
294 * @dev_id: Unused as we don't allow multiple devices.
295 *
296 * Handle an interrupt from the board. These are raised when the status
297 * map changes in what the board considers an interesting way. That means
298 * a failure condition occurring.
299 */
300
301static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
302{
303    /*
304     * Read the status register see what is up and
305     * then printk it.
306     */
307    unsigned char status;
308
309    spin_lock(&wdtpci_lock);
310
311    status = inb(WDT_SR);
312    udelay(8);
313
314    pr_crit("status %d\n", status);
315
316    if (type == 501) {
317        if (!(status & WDC_SR_TGOOD)) {
318            pr_crit("Overheat alarm (%d)\n", inb(WDT_RT));
319            udelay(8);
320        }
321        if (!(status & WDC_SR_PSUOVER))
322            pr_crit("PSU over voltage\n");
323        if (!(status & WDC_SR_PSUUNDR))
324            pr_crit("PSU under voltage\n");
325        if (tachometer) {
326            if (!(status & WDC_SR_FANGOOD))
327                pr_crit("Possible fan fault\n");
328        }
329    }
330    if (!(status & WDC_SR_WCCR)) {
331#ifdef SOFTWARE_REBOOT
332#ifdef ONLY_TESTING
333        pr_crit("Would Reboot\n");
334#else
335        pr_crit("Initiating system reboot\n");
336        emergency_restart(NULL);
337#endif
338#else
339        pr_crit("Reset in 5ms\n");
340#endif
341    }
342    spin_unlock(&wdtpci_lock);
343    return IRQ_HANDLED;
344}
345
346
347/**
348 * wdtpci_write:
349 * @file: file handle to the watchdog
350 * @buf: buffer to write (unused as data does not matter here
351 * @count: count of bytes
352 * @ppos: pointer to the position to write. No seeks allowed
353 *
354 * A write to a watchdog device is defined as a keepalive signal. Any
355 * write of data will do, as we we don't define content meaning.
356 */
357
358static ssize_t wdtpci_write(struct file *file, const char __user *buf,
359                        size_t count, loff_t *ppos)
360{
361    if (count) {
362        if (!nowayout) {
363            size_t i;
364
365            /* In case it was set long ago */
366            expect_close = 0;
367
368            for (i = 0; i != count; i++) {
369                char c;
370                if (get_user(c, buf + i))
371                    return -EFAULT;
372                if (c == 'V')
373                    expect_close = 42;
374            }
375        }
376        wdtpci_ping();
377    }
378    return count;
379}
380
381/**
382 * wdtpci_ioctl:
383 * @file: file handle to the device
384 * @cmd: watchdog command
385 * @arg: argument pointer
386 *
387 * The watchdog API defines a common set of functions for all watchdogs
388 * according to their available features. We only actually usefully support
389 * querying capabilities and current status.
390 */
391
392static long wdtpci_ioctl(struct file *file, unsigned int cmd,
393                            unsigned long arg)
394{
395    void __user *argp = (void __user *)arg;
396    int __user *p = argp;
397    int new_heartbeat;
398    int status;
399
400    struct watchdog_info ident = {
401        .options = WDIOF_SETTIMEOUT|
402                    WDIOF_MAGICCLOSE|
403                    WDIOF_KEEPALIVEPING,
404        .firmware_version = 1,
405        .identity = "PCI-WDT500/501",
406    };
407
408    /* Add options according to the card we have */
409    ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
410    if (type == 501) {
411        ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
412                            WDIOF_POWEROVER);
413        if (tachometer)
414            ident.options |= WDIOF_FANFAULT;
415    }
416
417    switch (cmd) {
418    case WDIOC_GETSUPPORT:
419        return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
420    case WDIOC_GETSTATUS:
421        wdtpci_get_status(&status);
422        return put_user(status, p);
423    case WDIOC_GETBOOTSTATUS:
424        return put_user(0, p);
425    case WDIOC_KEEPALIVE:
426        wdtpci_ping();
427        return 0;
428    case WDIOC_SETTIMEOUT:
429        if (get_user(new_heartbeat, p))
430            return -EFAULT;
431        if (wdtpci_set_heartbeat(new_heartbeat))
432            return -EINVAL;
433        wdtpci_ping();
434        /* Fall */
435    case WDIOC_GETTIMEOUT:
436        return put_user(heartbeat, p);
437    default:
438        return -ENOTTY;
439    }
440}
441
442/**
443 * wdtpci_open:
444 * @inode: inode of device
445 * @file: file handle to device
446 *
447 * The watchdog device has been opened. The watchdog device is single
448 * open and on opening we load the counters. Counter zero is a 100Hz
449 * cascade, into counter 1 which downcounts to reboot. When the counter
450 * triggers counter 2 downcounts the length of the reset pulse which
451 * set set to be as long as possible.
452 */
453
454static int wdtpci_open(struct inode *inode, struct file *file)
455{
456    if (test_and_set_bit(0, &open_lock))
457        return -EBUSY;
458
459    if (nowayout)
460        __module_get(THIS_MODULE);
461    /*
462     * Activate
463     */
464    wdtpci_start();
465    return nonseekable_open(inode, file);
466}
467
468/**
469 * wdtpci_release:
470 * @inode: inode to board
471 * @file: file handle to board
472 *
473 * The watchdog has a configurable API. There is a religious dispute
474 * between people who want their watchdog to be able to shut down and
475 * those who want to be sure if the watchdog manager dies the machine
476 * reboots. In the former case we disable the counters, in the latter
477 * case you have to open it again very soon.
478 */
479
480static int wdtpci_release(struct inode *inode, struct file *file)
481{
482    if (expect_close == 42) {
483        wdtpci_stop();
484    } else {
485        pr_crit("Unexpected close, not stopping timer!\n");
486        wdtpci_ping();
487    }
488    expect_close = 0;
489    clear_bit(0, &open_lock);
490    return 0;
491}
492
493/**
494 * wdtpci_temp_read:
495 * @file: file handle to the watchdog board
496 * @buf: buffer to write 1 byte into
497 * @count: length of buffer
498 * @ptr: offset (no seek allowed)
499 *
500 * Read reports the temperature in degrees Fahrenheit. The API is in
501 * fahrenheit. It was designed by an imperial measurement luddite.
502 */
503
504static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
505                        size_t count, loff_t *ptr)
506{
507    int temperature;
508
509    if (wdtpci_get_temperature(&temperature))
510        return -EFAULT;
511
512    if (copy_to_user(buf, &temperature, 1))
513        return -EFAULT;
514
515    return 1;
516}
517
518/**
519 * wdtpci_temp_open:
520 * @inode: inode of device
521 * @file: file handle to device
522 *
523 * The temperature device has been opened.
524 */
525
526static int wdtpci_temp_open(struct inode *inode, struct file *file)
527{
528    return nonseekable_open(inode, file);
529}
530
531/**
532 * wdtpci_temp_release:
533 * @inode: inode to board
534 * @file: file handle to board
535 *
536 * The temperature device has been closed.
537 */
538
539static int wdtpci_temp_release(struct inode *inode, struct file *file)
540{
541    return 0;
542}
543
544/**
545 * notify_sys:
546 * @this: our notifier block
547 * @code: the event being reported
548 * @unused: unused
549 *
550 * Our notifier is called on system shutdowns. We want to turn the card
551 * off at reboot otherwise the machine will reboot again during memory
552 * test or worse yet during the following fsck. This would suck, in fact
553 * trust me - if it happens it does suck.
554 */
555
556static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
557                            void *unused)
558{
559    if (code == SYS_DOWN || code == SYS_HALT)
560        wdtpci_stop();
561    return NOTIFY_DONE;
562}
563
564/*
565 * Kernel Interfaces
566 */
567
568
569static const struct file_operations wdtpci_fops = {
570    .owner = THIS_MODULE,
571    .llseek = no_llseek,
572    .write = wdtpci_write,
573    .unlocked_ioctl = wdtpci_ioctl,
574    .open = wdtpci_open,
575    .release = wdtpci_release,
576};
577
578static struct miscdevice wdtpci_miscdev = {
579    .minor = WATCHDOG_MINOR,
580    .name = "watchdog",
581    .fops = &wdtpci_fops,
582};
583
584static const struct file_operations wdtpci_temp_fops = {
585    .owner = THIS_MODULE,
586    .llseek = no_llseek,
587    .read = wdtpci_temp_read,
588    .open = wdtpci_temp_open,
589    .release = wdtpci_temp_release,
590};
591
592static struct miscdevice temp_miscdev = {
593    .minor = TEMP_MINOR,
594    .name = "temperature",
595    .fops = &wdtpci_temp_fops,
596};
597
598/*
599 * The WDT card needs to learn about soft shutdowns in order to
600 * turn the timebomb registers off.
601 */
602
603static struct notifier_block wdtpci_notifier = {
604    .notifier_call = wdtpci_notify_sys,
605};
606
607
608static int __devinit wdtpci_init_one(struct pci_dev *dev,
609                    const struct pci_device_id *ent)
610{
611    int ret = -EIO;
612
613    dev_count++;
614    if (dev_count > 1) {
615        pr_err("This driver only supports one device\n");
616        return -ENODEV;
617    }
618
619    if (type != 500 && type != 501) {
620        pr_err("unknown card type '%d'\n", type);
621        return -ENODEV;
622    }
623
624    if (pci_enable_device(dev)) {
625        pr_err("Not possible to enable PCI Device\n");
626        return -ENODEV;
627    }
628
629    if (pci_resource_start(dev, 2) == 0x0000) {
630        pr_err("No I/O-Address for card detected\n");
631        ret = -ENODEV;
632        goto out_pci;
633    }
634
635    if (pci_request_region(dev, 2, "wdt_pci")) {
636        pr_err("I/O address 0x%llx already in use\n",
637               (unsigned long long)pci_resource_start(dev, 2));
638        goto out_pci;
639    }
640
641    irq = dev->irq;
642    io = pci_resource_start(dev, 2);
643
644    if (request_irq(irq, wdtpci_interrupt, IRQF_SHARED,
645             "wdt_pci", &wdtpci_miscdev)) {
646        pr_err("IRQ %d is not free\n", irq);
647        goto out_reg;
648    }
649
650    pr_info("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n",
651        (unsigned long long)io, irq);
652
653    /* Check that the heartbeat value is within its range;
654       if not reset to the default */
655    if (wdtpci_set_heartbeat(heartbeat)) {
656        wdtpci_set_heartbeat(WD_TIMO);
657        pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n",
658            WD_TIMO);
659    }
660
661    ret = register_reboot_notifier(&wdtpci_notifier);
662    if (ret) {
663        pr_err("cannot register reboot notifier (err=%d)\n", ret);
664        goto out_irq;
665    }
666
667    if (type == 501) {
668        ret = misc_register(&temp_miscdev);
669        if (ret) {
670            pr_err("cannot register miscdev on minor=%d (err=%d)\n",
671                   TEMP_MINOR, ret);
672            goto out_rbt;
673        }
674    }
675
676    ret = misc_register(&wdtpci_miscdev);
677    if (ret) {
678        pr_err("cannot register miscdev on minor=%d (err=%d)\n",
679               WATCHDOG_MINOR, ret);
680        goto out_misc;
681    }
682
683    pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
684        heartbeat, nowayout);
685    if (type == 501)
686        pr_info("Fan Tachometer is %s\n",
687            tachometer ? "Enabled" : "Disabled");
688
689    ret = 0;
690out:
691    return ret;
692
693out_misc:
694    if (type == 501)
695        misc_deregister(&temp_miscdev);
696out_rbt:
697    unregister_reboot_notifier(&wdtpci_notifier);
698out_irq:
699    free_irq(irq, &wdtpci_miscdev);
700out_reg:
701    pci_release_region(dev, 2);
702out_pci:
703    pci_disable_device(dev);
704    goto out;
705}
706
707
708static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
709{
710    /* here we assume only one device will ever have
711     * been picked up and registered by probe function */
712    misc_deregister(&wdtpci_miscdev);
713    if (type == 501)
714        misc_deregister(&temp_miscdev);
715    unregister_reboot_notifier(&wdtpci_notifier);
716    free_irq(irq, &wdtpci_miscdev);
717    pci_release_region(pdev, 2);
718    pci_disable_device(pdev);
719    dev_count--;
720}
721
722
723static DEFINE_PCI_DEVICE_TABLE(wdtpci_pci_tbl) = {
724    {
725        .vendor = PCI_VENDOR_ID_ACCESSIO,
726        .device = PCI_DEVICE_ID_ACCESSIO_WDG_CSM,
727        .subvendor = PCI_ANY_ID,
728        .subdevice = PCI_ANY_ID,
729    },
730    { 0, }, /* terminate list */
731};
732MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
733
734
735static struct pci_driver wdtpci_driver = {
736    .name = "wdt_pci",
737    .id_table = wdtpci_pci_tbl,
738    .probe = wdtpci_init_one,
739    .remove = __devexit_p(wdtpci_remove_one),
740};
741
742module_pci_driver(wdtpci_driver);
743
744MODULE_AUTHOR("JP Nollmann, Alan Cox");
745MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
746MODULE_LICENSE("GPL");
747MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
748MODULE_ALIAS_MISCDEV(TEMP_MINOR);
749

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