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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Vlad Drukker0e94f2e2007-03-25 17:34:39 +02002 * w83627hf/thf WDT driver
3 *
4 * (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
5 * added support for W83627THF.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
Al Virod36b6912011-12-29 17:09:01 -05007 * (c) Copyright 2003,2007 Pádraig Brady <P@draigBrady.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * Based on advantechwdt.c which is based on wdt.c.
10 * Original copyright messages:
11 *
12 * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
13 *
Alan Cox29fa0582008-10-27 15:17:56 +000014 * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
15 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 *
22 * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
23 * warranty for any of this software. This material is provided
24 * "AS-IS" and at no charge.
25 *
Alan Cox29fa0582008-10-27 15:17:56 +000026 * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 */
28
Joe Perches27c766a2012-02-15 15:06:19 -080029#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/module.h>
32#include <linux/moduleparam.h>
33#include <linux/types.h>
34#include <linux/miscdevice.h>
35#include <linux/watchdog.h>
36#include <linux/fs.h>
37#include <linux/ioport.h>
38#include <linux/notifier.h>
39#include <linux/reboot.h>
40#include <linux/init.h>
Wim Van Sebroeckab9d4412006-09-02 18:50:20 +020041#include <linux/spinlock.h>
Alan Cox46a39492008-05-19 14:09:18 +010042#include <linux/io.h>
43#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Benny Loenstrup Ammitzboell9c67bea2010-11-11 16:08:41 +010046#define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
48
49static unsigned long wdt_is_open;
50static char expect_close;
Alexey Dobriyanc7dfd0c2007-11-01 16:27:08 -070051static DEFINE_SPINLOCK(io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53/* You must set this - there is no sane way to probe for this board. */
54static int wdt_io = 0x2E;
55module_param(wdt_io, int, 0);
Vlad Drukker0e94f2e2007-03-25 17:34:39 +020056MODULE_PARM_DESC(wdt_io, "w83627hf/thf WDT io port (default 0x2E)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
59module_param(timeout, int, 0);
Alan Cox46a39492008-05-19 14:09:18 +010060MODULE_PARM_DESC(timeout,
61 "Watchdog timeout in seconds. 1 <= timeout <= 255, default="
62 __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +010064static bool nowayout = WATCHDOG_NOWAYOUT;
65module_param(nowayout, bool, 0);
Alan Cox46a39492008-05-19 14:09:18 +010066MODULE_PARM_DESC(nowayout,
67 "Watchdog cannot be stopped once started (default="
68 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70/*
71 * Kernel methods.
72 */
73
74#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */
Alan Cox46a39492008-05-19 14:09:18 +010075#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register
76 (same as EFER) */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
78
Alan Cox46a39492008-05-19 14:09:18 +010079static void w83627hf_select_wd_register(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080{
Vlad Drukker0e94f2e2007-03-25 17:34:39 +020081 unsigned char c;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 outb_p(0x87, WDT_EFER); /* Enter extended function mode */
83 outb_p(0x87, WDT_EFER); /* Again according to manual */
84
Pádraig Brady28dd1b02007-07-24 11:49:27 +010085 outb(0x20, WDT_EFER); /* check chip version */
Vlad Drukker0e94f2e2007-03-25 17:34:39 +020086 c = inb(WDT_EFDR);
Pádraig Brady28dd1b02007-07-24 11:49:27 +010087 if (c == 0x82) { /* W83627THF */
Vlad Drukker0e94f2e2007-03-25 17:34:39 +020088 outb_p(0x2b, WDT_EFER); /* select GPIO3 */
89 c = ((inb_p(WDT_EFDR) & 0xf7) | 0x04); /* select WDT0 */
90 outb_p(0x2b, WDT_EFER);
91 outb_p(c, WDT_EFDR); /* set GPIO3 to WDT0 */
Benny Loenstrup Ammitzboell9c67bea2010-11-11 16:08:41 +010092 } else if (c == 0x88 || c == 0xa0) { /* W83627EHF / W83627DHG */
Slobodan Tomićcf1eaab2009-06-28 21:20:36 +020093 outb_p(0x2d, WDT_EFER); /* select GPIO5 */
94 c = inb_p(WDT_EFDR) & ~0x01; /* PIN77 -> WDT0# */
95 outb_p(0x2d, WDT_EFER);
96 outb_p(c, WDT_EFDR); /* set GPIO5 to WDT0 */
Vlad Drukker0e94f2e2007-03-25 17:34:39 +020097 }
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 outb_p(0x07, WDT_EFER); /* point to logical device number reg */
100 outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */
101 outb_p(0x30, WDT_EFER); /* select CR30 */
102 outb_p(0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
103}
104
Alan Cox46a39492008-05-19 14:09:18 +0100105static void w83627hf_unselect_wd_register(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106{
107 outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
108}
109
110/* tyan motherboards seem to set F5 to 0x4C ?
111 * So explicitly init to appropriate value. */
Alan Cox46a39492008-05-19 14:09:18 +0100112
113static void w83627hf_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
115 unsigned char t;
116
117 w83627hf_select_wd_register();
118
P@Draig Brady93642ec2005-08-17 09:06:07 +0200119 outb_p(0xF6, WDT_EFER); /* Select CRF6 */
Alan Cox46a39492008-05-19 14:09:18 +0100120 t = inb_p(WDT_EFDR); /* read CRF6 */
P@Draig Brady93642ec2005-08-17 09:06:07 +0200121 if (t != 0) {
Joe Perches27c766a2012-02-15 15:06:19 -0800122 pr_info("Watchdog already running. Resetting timeout to %d sec\n",
123 timeout);
P@Draig Brady93642ec2005-08-17 09:06:07 +0200124 outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */
125 }
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 outb_p(0xF5, WDT_EFER); /* Select CRF5 */
Alan Cox46a39492008-05-19 14:09:18 +0100128 t = inb_p(WDT_EFDR); /* read CRF5 */
129 t &= ~0x0C; /* set second mode & disable keyboard
130 turning off watchdog */
Herman Morsink Vollenbroek6d106e02010-12-06 21:24:56 +0100131 t |= 0x02; /* enable the WDTO# output low pulse
132 to the KBRST# pin (PIN60) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 outb_p(t, WDT_EFDR); /* Write back to CRF5 */
134
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100135 outb_p(0xF7, WDT_EFER); /* Select CRF7 */
Alan Cox46a39492008-05-19 14:09:18 +0100136 t = inb_p(WDT_EFDR); /* read CRF7 */
137 t &= ~0xC0; /* disable keyboard & mouse turning off
138 watchdog */
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100139 outb_p(t, WDT_EFDR); /* Write back to CRF7 */
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 w83627hf_unselect_wd_register();
142}
143
Greg Leec63b6d02011-09-12 20:28:46 -0400144static void wdt_set_time(int timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145{
Wim Van Sebroeckab9d4412006-09-02 18:50:20 +0200146 spin_lock(&io_lock);
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 w83627hf_select_wd_register();
149
150 outb_p(0xF6, WDT_EFER); /* Select CRF6 */
151 outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF6 */
152
153 w83627hf_unselect_wd_register();
Wim Van Sebroeckab9d4412006-09-02 18:50:20 +0200154
155 spin_unlock(&io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
Alan Cox46a39492008-05-19 14:09:18 +0100158static int wdt_ping(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
Greg Leec63b6d02011-09-12 20:28:46 -0400160 wdt_set_time(timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 return 0;
162}
163
Alan Cox46a39492008-05-19 14:09:18 +0100164static int wdt_disable(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Greg Leec63b6d02011-09-12 20:28:46 -0400166 wdt_set_time(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 return 0;
168}
169
Alan Cox46a39492008-05-19 14:09:18 +0100170static int wdt_set_heartbeat(int t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171{
Alan Cox46a39492008-05-19 14:09:18 +0100172 if (t < 1 || t > 255)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 timeout = t;
175 return 0;
176}
177
Greg Leec63b6d02011-09-12 20:28:46 -0400178static int wdt_get_time(void)
179{
180 int timeleft;
181
182 spin_lock(&io_lock);
183
184 w83627hf_select_wd_register();
185
186 outb_p(0xF6, WDT_EFER); /* Select CRF6 */
187 timeleft = inb_p(WDT_EFDR); /* Read Timeout counter to CRF6 */
188
189 w83627hf_unselect_wd_register();
190
191 spin_unlock(&io_lock);
192
193 return timeleft;
194}
195
Alan Cox46a39492008-05-19 14:09:18 +0100196static ssize_t wdt_write(struct file *file, const char __user *buf,
197 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
199 if (count) {
200 if (!nowayout) {
201 size_t i;
202
203 expect_close = 0;
204
205 for (i = 0; i != count; i++) {
206 char c;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000207 if (get_user(c, buf + i))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 return -EFAULT;
209 if (c == 'V')
210 expect_close = 42;
211 }
212 }
213 wdt_ping();
214 }
215 return count;
216}
217
Alan Cox46a39492008-05-19 14:09:18 +0100218static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219{
220 void __user *argp = (void __user *)arg;
221 int __user *p = argp;
Greg Leec63b6d02011-09-12 20:28:46 -0400222 int timeval;
Wim Van Sebroeck42747d72009-12-26 18:55:22 +0000223 static const struct watchdog_info ident = {
Alan Cox46a39492008-05-19 14:09:18 +0100224 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
225 WDIOF_MAGICCLOSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 .firmware_version = 1,
227 .identity = "W83627HF WDT",
228 };
229
230 switch (cmd) {
231 case WDIOC_GETSUPPORT:
Alan Cox46a39492008-05-19 14:09:18 +0100232 if (copy_to_user(argp, &ident, sizeof(ident)))
233 return -EFAULT;
234 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 case WDIOC_GETSTATUS:
236 case WDIOC_GETBOOTSTATUS:
Alan Cox46a39492008-05-19 14:09:18 +0100237 return put_user(0, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 case WDIOC_SETOPTIONS:
239 {
Alan Cox46a39492008-05-19 14:09:18 +0100240 int options, retval = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Alan Cox46a39492008-05-19 14:09:18 +0100242 if (get_user(options, p))
243 return -EFAULT;
244 if (options & WDIOS_DISABLECARD) {
245 wdt_disable();
246 retval = 0;
247 }
248 if (options & WDIOS_ENABLECARD) {
249 wdt_ping();
250 retval = 0;
251 }
252 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 }
Wim Van Sebroeck0c06090c2008-07-18 11:41:17 +0000254 case WDIOC_KEEPALIVE:
255 wdt_ping();
256 break;
257 case WDIOC_SETTIMEOUT:
Greg Leec63b6d02011-09-12 20:28:46 -0400258 if (get_user(timeval, p))
Wim Van Sebroeck0c06090c2008-07-18 11:41:17 +0000259 return -EFAULT;
Greg Leec63b6d02011-09-12 20:28:46 -0400260 if (wdt_set_heartbeat(timeval))
Wim Van Sebroeck0c06090c2008-07-18 11:41:17 +0000261 return -EINVAL;
262 wdt_ping();
263 /* Fall */
264 case WDIOC_GETTIMEOUT:
265 return put_user(timeout, p);
Greg Leec63b6d02011-09-12 20:28:46 -0400266 case WDIOC_GETTIMELEFT:
267 timeval = wdt_get_time();
268 return put_user(timeval, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 default:
Alan Cox46a39492008-05-19 14:09:18 +0100270 return -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 }
272 return 0;
273}
274
Alan Cox46a39492008-05-19 14:09:18 +0100275static int wdt_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
277 if (test_and_set_bit(0, &wdt_is_open))
278 return -EBUSY;
279 /*
280 * Activate
281 */
282
283 wdt_ping();
284 return nonseekable_open(inode, file);
285}
286
Alan Cox46a39492008-05-19 14:09:18 +0100287static int wdt_close(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Alan Cox46a39492008-05-19 14:09:18 +0100289 if (expect_close == 42)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 wdt_disable();
Alan Cox46a39492008-05-19 14:09:18 +0100291 else {
Joe Perches27c766a2012-02-15 15:06:19 -0800292 pr_crit("Unexpected close, not stopping watchdog!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 wdt_ping();
294 }
295 expect_close = 0;
296 clear_bit(0, &wdt_is_open);
297 return 0;
298}
299
300/*
301 * Notifier for system down
302 */
303
Alan Cox46a39492008-05-19 14:09:18 +0100304static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 void *unused)
306{
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000307 if (code == SYS_DOWN || code == SYS_HALT)
308 wdt_disable(); /* Turn the WDT off */
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 return NOTIFY_DONE;
311}
312
313/*
314 * Kernel Interfaces
315 */
316
Arjan van de Ven62322d22006-07-03 00:24:21 -0700317static const struct file_operations wdt_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 .owner = THIS_MODULE,
319 .llseek = no_llseek,
320 .write = wdt_write,
Alan Cox46a39492008-05-19 14:09:18 +0100321 .unlocked_ioctl = wdt_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 .open = wdt_open,
323 .release = wdt_close,
324};
325
326static struct miscdevice wdt_miscdev = {
327 .minor = WATCHDOG_MINOR,
328 .name = "watchdog",
329 .fops = &wdt_fops,
330};
331
332/*
333 * The WDT needs to learn about soft shutdowns in order to
334 * turn the timebomb registers off.
335 */
336
337static struct notifier_block wdt_notifier = {
338 .notifier_call = wdt_notify_sys,
339};
340
Alan Cox46a39492008-05-19 14:09:18 +0100341static int __init wdt_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342{
343 int ret;
344
Joe Perches27c766a2012-02-15 15:06:19 -0800345 pr_info("WDT driver for the Winbond(TM) W83627HF/THF/HG/DHG Super I/O chip initialising\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
347 if (wdt_set_heartbeat(timeout)) {
348 wdt_set_heartbeat(WATCHDOG_TIMEOUT);
Joe Perches27c766a2012-02-15 15:06:19 -0800349 pr_info("timeout value must be 1 <= timeout <= 255, using %d\n",
350 WATCHDOG_TIMEOUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 }
352
353 if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
Joe Perches27c766a2012-02-15 15:06:19 -0800354 pr_err("I/O address 0x%04x already in use\n", wdt_io);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 ret = -EIO;
356 goto out;
357 }
358
359 w83627hf_init();
360
361 ret = register_reboot_notifier(&wdt_notifier);
362 if (ret != 0) {
Joe Perches27c766a2012-02-15 15:06:19 -0800363 pr_err("cannot register reboot notifier (err=%d)\n", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 goto unreg_regions;
365 }
366
367 ret = misc_register(&wdt_miscdev);
368 if (ret != 0) {
Joe Perches27c766a2012-02-15 15:06:19 -0800369 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
370 WATCHDOG_MINOR, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 goto unreg_reboot;
372 }
373
Joe Perches27c766a2012-02-15 15:06:19 -0800374 pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
375 timeout, nowayout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
377out:
378 return ret;
379unreg_reboot:
380 unregister_reboot_notifier(&wdt_notifier);
381unreg_regions:
382 release_region(wdt_io, 1);
383 goto out;
384}
385
Alan Cox46a39492008-05-19 14:09:18 +0100386static void __exit wdt_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
388 misc_deregister(&wdt_miscdev);
389 unregister_reboot_notifier(&wdt_notifier);
Alan Cox46a39492008-05-19 14:09:18 +0100390 release_region(wdt_io, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391}
392
393module_init(wdt_init);
394module_exit(wdt_exit);
395
396MODULE_LICENSE("GPL");
Al Virod36b6912011-12-29 17:09:01 -0500397MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>");
Vlad Drukker0e94f2e2007-03-25 17:34:39 +0200398MODULE_DESCRIPTION("w83627hf/thf WDT driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);