blob: 916890abffdd3ca9f9010d90b53319db932fce4c [file] [log] [blame]
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 *
Pádraig Brady28dd1b02007-07-24 11:49:27 +01007 * (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
29#include <linux/module.h>
30#include <linux/moduleparam.h>
31#include <linux/types.h>
32#include <linux/miscdevice.h>
33#include <linux/watchdog.h>
34#include <linux/fs.h>
35#include <linux/ioport.h>
36#include <linux/notifier.h>
37#include <linux/reboot.h>
38#include <linux/init.h>
Wim Van Sebroeckab9d4412006-09-02 18:50:20 +020039#include <linux/spinlock.h>
Alan Cox46a39492008-05-19 14:09:18 +010040#include <linux/io.h>
41#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <asm/system.h>
44
Pádraig Brady28dd1b02007-07-24 11:49:27 +010045#define WATCHDOG_NAME "w83627hf/thf/hg WDT"
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#define PFX WATCHDOG_NAME ": "
47#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
Andrey Panin4bfdf372005-07-27 11:43:58 -070064static int nowayout = WATCHDOG_NOWAYOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065module_param(nowayout, int, 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 */
92 }
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 outb_p(0x07, WDT_EFER); /* point to logical device number reg */
95 outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */
96 outb_p(0x30, WDT_EFER); /* select CR30 */
97 outb_p(0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
98}
99
Alan Cox46a39492008-05-19 14:09:18 +0100100static void w83627hf_unselect_wd_register(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
102 outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
103}
104
105/* tyan motherboards seem to set F5 to 0x4C ?
106 * So explicitly init to appropriate value. */
Alan Cox46a39492008-05-19 14:09:18 +0100107
108static void w83627hf_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
110 unsigned char t;
111
112 w83627hf_select_wd_register();
113
P@Draig Brady93642ec2005-08-17 09:06:07 +0200114 outb_p(0xF6, WDT_EFER); /* Select CRF6 */
Alan Cox46a39492008-05-19 14:09:18 +0100115 t = inb_p(WDT_EFDR); /* read CRF6 */
P@Draig Brady93642ec2005-08-17 09:06:07 +0200116 if (t != 0) {
Alan Cox46a39492008-05-19 14:09:18 +0100117 printk(KERN_INFO PFX
118 "Watchdog already running. Resetting timeout to %d sec\n",
119 timeout);
P@Draig Brady93642ec2005-08-17 09:06:07 +0200120 outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */
121 }
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 outb_p(0xF5, WDT_EFER); /* Select CRF5 */
Alan Cox46a39492008-05-19 14:09:18 +0100124 t = inb_p(WDT_EFDR); /* read CRF5 */
125 t &= ~0x0C; /* set second mode & disable keyboard
126 turning off watchdog */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 outb_p(t, WDT_EFDR); /* Write back to CRF5 */
128
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100129 outb_p(0xF7, WDT_EFER); /* Select CRF7 */
Alan Cox46a39492008-05-19 14:09:18 +0100130 t = inb_p(WDT_EFDR); /* read CRF7 */
131 t &= ~0xC0; /* disable keyboard & mouse turning off
132 watchdog */
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100133 outb_p(t, WDT_EFDR); /* Write back to CRF7 */
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 w83627hf_unselect_wd_register();
136}
137
Alan Cox46a39492008-05-19 14:09:18 +0100138static void wdt_ctrl(int timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139{
Wim Van Sebroeckab9d4412006-09-02 18:50:20 +0200140 spin_lock(&io_lock);
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 w83627hf_select_wd_register();
143
144 outb_p(0xF6, WDT_EFER); /* Select CRF6 */
145 outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF6 */
146
147 w83627hf_unselect_wd_register();
Wim Van Sebroeckab9d4412006-09-02 18:50:20 +0200148
149 spin_unlock(&io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
Alan Cox46a39492008-05-19 14:09:18 +0100152static int wdt_ping(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
154 wdt_ctrl(timeout);
155 return 0;
156}
157
Alan Cox46a39492008-05-19 14:09:18 +0100158static int wdt_disable(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
160 wdt_ctrl(0);
161 return 0;
162}
163
Alan Cox46a39492008-05-19 14:09:18 +0100164static int wdt_set_heartbeat(int t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Alan Cox46a39492008-05-19 14:09:18 +0100166 if (t < 1 || t > 255)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 timeout = t;
169 return 0;
170}
171
Alan Cox46a39492008-05-19 14:09:18 +0100172static ssize_t wdt_write(struct file *file, const char __user *buf,
173 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
175 if (count) {
176 if (!nowayout) {
177 size_t i;
178
179 expect_close = 0;
180
181 for (i = 0; i != count; i++) {
182 char c;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000183 if (get_user(c, buf + i))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return -EFAULT;
185 if (c == 'V')
186 expect_close = 42;
187 }
188 }
189 wdt_ping();
190 }
191 return count;
192}
193
Alan Cox46a39492008-05-19 14:09:18 +0100194static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195{
196 void __user *argp = (void __user *)arg;
197 int __user *p = argp;
198 int new_timeout;
199 static struct watchdog_info ident = {
Alan Cox46a39492008-05-19 14:09:18 +0100200 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
201 WDIOF_MAGICCLOSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 .firmware_version = 1,
203 .identity = "W83627HF WDT",
204 };
205
206 switch (cmd) {
207 case WDIOC_GETSUPPORT:
Alan Cox46a39492008-05-19 14:09:18 +0100208 if (copy_to_user(argp, &ident, sizeof(ident)))
209 return -EFAULT;
210 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 case WDIOC_GETSTATUS:
212 case WDIOC_GETBOOTSTATUS:
Alan Cox46a39492008-05-19 14:09:18 +0100213 return put_user(0, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 case WDIOC_SETOPTIONS:
215 {
Alan Cox46a39492008-05-19 14:09:18 +0100216 int options, retval = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Alan Cox46a39492008-05-19 14:09:18 +0100218 if (get_user(options, p))
219 return -EFAULT;
220 if (options & WDIOS_DISABLECARD) {
221 wdt_disable();
222 retval = 0;
223 }
224 if (options & WDIOS_ENABLECARD) {
225 wdt_ping();
226 retval = 0;
227 }
228 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 }
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000230 case WDIOC_KEEPALIVE:
231 wdt_ping();
232 break;
233 case WDIOC_SETTIMEOUT:
234 if (get_user(new_timeout, p))
235 return -EFAULT;
236 if (wdt_set_heartbeat(new_timeout))
237 return -EINVAL;
238 wdt_ping();
239 /* Fall */
240 case WDIOC_GETTIMEOUT:
241 return put_user(timeout, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 default:
Alan Cox46a39492008-05-19 14:09:18 +0100243 return -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 }
245 return 0;
246}
247
Alan Cox46a39492008-05-19 14:09:18 +0100248static int wdt_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
250 if (test_and_set_bit(0, &wdt_is_open))
251 return -EBUSY;
252 /*
253 * Activate
254 */
255
256 wdt_ping();
257 return nonseekable_open(inode, file);
258}
259
Alan Cox46a39492008-05-19 14:09:18 +0100260static int wdt_close(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261{
Alan Cox46a39492008-05-19 14:09:18 +0100262 if (expect_close == 42)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 wdt_disable();
Alan Cox46a39492008-05-19 14:09:18 +0100264 else {
265 printk(KERN_CRIT PFX
266 "Unexpected close, not stopping watchdog!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 wdt_ping();
268 }
269 expect_close = 0;
270 clear_bit(0, &wdt_is_open);
271 return 0;
272}
273
274/*
275 * Notifier for system down
276 */
277
Alan Cox46a39492008-05-19 14:09:18 +0100278static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 void *unused)
280{
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000281 if (code == SYS_DOWN || code == SYS_HALT)
282 wdt_disable(); /* Turn the WDT off */
283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 return NOTIFY_DONE;
285}
286
287/*
288 * Kernel Interfaces
289 */
290
Arjan van de Ven62322d22006-07-03 00:24:21 -0700291static const struct file_operations wdt_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 .owner = THIS_MODULE,
293 .llseek = no_llseek,
294 .write = wdt_write,
Alan Cox46a39492008-05-19 14:09:18 +0100295 .unlocked_ioctl = wdt_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 .open = wdt_open,
297 .release = wdt_close,
298};
299
300static struct miscdevice wdt_miscdev = {
301 .minor = WATCHDOG_MINOR,
302 .name = "watchdog",
303 .fops = &wdt_fops,
304};
305
306/*
307 * The WDT needs to learn about soft shutdowns in order to
308 * turn the timebomb registers off.
309 */
310
311static struct notifier_block wdt_notifier = {
312 .notifier_call = wdt_notify_sys,
313};
314
Alan Cox46a39492008-05-19 14:09:18 +0100315static int __init wdt_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
317 int ret;
318
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100319 printk(KERN_INFO "WDT driver for the Winbond(TM) W83627HF/THF/HG Super I/O chip initialising.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
321 if (wdt_set_heartbeat(timeout)) {
322 wdt_set_heartbeat(WATCHDOG_TIMEOUT);
Alan Cox46a39492008-05-19 14:09:18 +0100323 printk(KERN_INFO PFX
324 "timeout value must be 1 <= timeout <= 255, using %d\n",
325 WATCHDOG_TIMEOUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
327
328 if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
Alan Cox46a39492008-05-19 14:09:18 +0100329 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 wdt_io);
331 ret = -EIO;
332 goto out;
333 }
334
335 w83627hf_init();
336
337 ret = register_reboot_notifier(&wdt_notifier);
338 if (ret != 0) {
Alan Cox46a39492008-05-19 14:09:18 +0100339 printk(KERN_ERR PFX
340 "cannot register reboot notifier (err=%d)\n", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 goto unreg_regions;
342 }
343
344 ret = misc_register(&wdt_miscdev);
345 if (ret != 0) {
Alan Cox46a39492008-05-19 14:09:18 +0100346 printk(KERN_ERR PFX
347 "cannot register miscdev on minor=%d (err=%d)\n",
348 WATCHDOG_MINOR, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 goto unreg_reboot;
350 }
351
Alan Cox46a39492008-05-19 14:09:18 +0100352 printk(KERN_INFO PFX
353 "initialized. timeout=%d sec (nowayout=%d)\n",
354 timeout, nowayout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356out:
357 return ret;
358unreg_reboot:
359 unregister_reboot_notifier(&wdt_notifier);
360unreg_regions:
361 release_region(wdt_io, 1);
362 goto out;
363}
364
Alan Cox46a39492008-05-19 14:09:18 +0100365static void __exit wdt_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
367 misc_deregister(&wdt_miscdev);
368 unregister_reboot_notifier(&wdt_notifier);
Alan Cox46a39492008-05-19 14:09:18 +0100369 release_region(wdt_io, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370}
371
372module_init(wdt_init);
373module_exit(wdt_exit);
374
375MODULE_LICENSE("GPL");
376MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>");
Vlad Drukker0e94f2e2007-03-25 17:34:39 +0200377MODULE_DESCRIPTION("w83627hf/thf WDT driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);