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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 *
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
Benny Loenstrup Ammitzboell9c67bea2010-11-11 16:08:41 +010045#define WATCHDOG_NAME "w83627hf/thf/hg/dhg 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 */
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) {
Alan Cox46a39492008-05-19 14:09:18 +0100122 printk(KERN_INFO PFX
123 "Watchdog already running. Resetting timeout to %d sec\n",
124 timeout);
P@Draig Brady93642ec2005-08-17 09:06:07 +0200125 outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */
126 }
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 outb_p(0xF5, WDT_EFER); /* Select CRF5 */
Alan Cox46a39492008-05-19 14:09:18 +0100129 t = inb_p(WDT_EFDR); /* read CRF5 */
130 t &= ~0x0C; /* set second mode & disable keyboard
131 turning off watchdog */
Herman Morsink Vollenbroek6d106e02010-12-06 21:24:56 +0100132 t |= 0x02; /* enable the WDTO# output low pulse
133 to the KBRST# pin (PIN60) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 outb_p(t, WDT_EFDR); /* Write back to CRF5 */
135
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100136 outb_p(0xF7, WDT_EFER); /* Select CRF7 */
Alan Cox46a39492008-05-19 14:09:18 +0100137 t = inb_p(WDT_EFDR); /* read CRF7 */
138 t &= ~0xC0; /* disable keyboard & mouse turning off
139 watchdog */
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100140 outb_p(t, WDT_EFDR); /* Write back to CRF7 */
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 w83627hf_unselect_wd_register();
143}
144
Alan Cox46a39492008-05-19 14:09:18 +0100145static void wdt_ctrl(int timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
Wim Van Sebroeckab9d4412006-09-02 18:50:20 +0200147 spin_lock(&io_lock);
Pádraig Brady28dd1b02007-07-24 11:49:27 +0100148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 w83627hf_select_wd_register();
150
151 outb_p(0xF6, WDT_EFER); /* Select CRF6 */
152 outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF6 */
153
154 w83627hf_unselect_wd_register();
Wim Van Sebroeckab9d4412006-09-02 18:50:20 +0200155
156 spin_unlock(&io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157}
158
Alan Cox46a39492008-05-19 14:09:18 +0100159static int wdt_ping(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
161 wdt_ctrl(timeout);
162 return 0;
163}
164
Alan Cox46a39492008-05-19 14:09:18 +0100165static int wdt_disable(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
167 wdt_ctrl(0);
168 return 0;
169}
170
Alan Cox46a39492008-05-19 14:09:18 +0100171static int wdt_set_heartbeat(int t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
Alan Cox46a39492008-05-19 14:09:18 +0100173 if (t < 1 || t > 255)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 timeout = t;
176 return 0;
177}
178
Alan Cox46a39492008-05-19 14:09:18 +0100179static ssize_t wdt_write(struct file *file, const char __user *buf,
180 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
182 if (count) {
183 if (!nowayout) {
184 size_t i;
185
186 expect_close = 0;
187
188 for (i = 0; i != count; i++) {
189 char c;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000190 if (get_user(c, buf + i))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 return -EFAULT;
192 if (c == 'V')
193 expect_close = 42;
194 }
195 }
196 wdt_ping();
197 }
198 return count;
199}
200
Alan Cox46a39492008-05-19 14:09:18 +0100201static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
203 void __user *argp = (void __user *)arg;
204 int __user *p = argp;
205 int new_timeout;
Wim Van Sebroeck42747d72009-12-26 18:55:22 +0000206 static const struct watchdog_info ident = {
Alan Cox46a39492008-05-19 14:09:18 +0100207 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
208 WDIOF_MAGICCLOSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 .firmware_version = 1,
210 .identity = "W83627HF WDT",
211 };
212
213 switch (cmd) {
214 case WDIOC_GETSUPPORT:
Alan Cox46a39492008-05-19 14:09:18 +0100215 if (copy_to_user(argp, &ident, sizeof(ident)))
216 return -EFAULT;
217 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 case WDIOC_GETSTATUS:
219 case WDIOC_GETBOOTSTATUS:
Alan Cox46a39492008-05-19 14:09:18 +0100220 return put_user(0, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 case WDIOC_SETOPTIONS:
222 {
Alan Cox46a39492008-05-19 14:09:18 +0100223 int options, retval = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Alan Cox46a39492008-05-19 14:09:18 +0100225 if (get_user(options, p))
226 return -EFAULT;
227 if (options & WDIOS_DISABLECARD) {
228 wdt_disable();
229 retval = 0;
230 }
231 if (options & WDIOS_ENABLECARD) {
232 wdt_ping();
233 retval = 0;
234 }
235 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 }
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000237 case WDIOC_KEEPALIVE:
238 wdt_ping();
239 break;
240 case WDIOC_SETTIMEOUT:
241 if (get_user(new_timeout, p))
242 return -EFAULT;
243 if (wdt_set_heartbeat(new_timeout))
244 return -EINVAL;
245 wdt_ping();
246 /* Fall */
247 case WDIOC_GETTIMEOUT:
248 return put_user(timeout, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 default:
Alan Cox46a39492008-05-19 14:09:18 +0100250 return -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 }
252 return 0;
253}
254
Alan Cox46a39492008-05-19 14:09:18 +0100255static int wdt_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256{
257 if (test_and_set_bit(0, &wdt_is_open))
258 return -EBUSY;
259 /*
260 * Activate
261 */
262
263 wdt_ping();
264 return nonseekable_open(inode, file);
265}
266
Alan Cox46a39492008-05-19 14:09:18 +0100267static int wdt_close(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268{
Alan Cox46a39492008-05-19 14:09:18 +0100269 if (expect_close == 42)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 wdt_disable();
Alan Cox46a39492008-05-19 14:09:18 +0100271 else {
272 printk(KERN_CRIT PFX
273 "Unexpected close, not stopping watchdog!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 wdt_ping();
275 }
276 expect_close = 0;
277 clear_bit(0, &wdt_is_open);
278 return 0;
279}
280
281/*
282 * Notifier for system down
283 */
284
Alan Cox46a39492008-05-19 14:09:18 +0100285static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 void *unused)
287{
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000288 if (code == SYS_DOWN || code == SYS_HALT)
289 wdt_disable(); /* Turn the WDT off */
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 return NOTIFY_DONE;
292}
293
294/*
295 * Kernel Interfaces
296 */
297
Arjan van de Ven62322d22006-07-03 00:24:21 -0700298static const struct file_operations wdt_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 .owner = THIS_MODULE,
300 .llseek = no_llseek,
301 .write = wdt_write,
Alan Cox46a39492008-05-19 14:09:18 +0100302 .unlocked_ioctl = wdt_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 .open = wdt_open,
304 .release = wdt_close,
305};
306
307static struct miscdevice wdt_miscdev = {
308 .minor = WATCHDOG_MINOR,
309 .name = "watchdog",
310 .fops = &wdt_fops,
311};
312
313/*
314 * The WDT needs to learn about soft shutdowns in order to
315 * turn the timebomb registers off.
316 */
317
318static struct notifier_block wdt_notifier = {
319 .notifier_call = wdt_notify_sys,
320};
321
Alan Cox46a39492008-05-19 14:09:18 +0100322static int __init wdt_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323{
324 int ret;
325
Benny Loenstrup Ammitzboell9c67bea2010-11-11 16:08:41 +0100326 printk(KERN_INFO "WDT driver for the Winbond(TM) W83627HF/THF/HG/DHG Super I/O chip initialising.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 if (wdt_set_heartbeat(timeout)) {
329 wdt_set_heartbeat(WATCHDOG_TIMEOUT);
Alan Cox46a39492008-05-19 14:09:18 +0100330 printk(KERN_INFO PFX
331 "timeout value must be 1 <= timeout <= 255, using %d\n",
332 WATCHDOG_TIMEOUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 }
334
335 if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
Alan Cox46a39492008-05-19 14:09:18 +0100336 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 wdt_io);
338 ret = -EIO;
339 goto out;
340 }
341
342 w83627hf_init();
343
344 ret = register_reboot_notifier(&wdt_notifier);
345 if (ret != 0) {
Alan Cox46a39492008-05-19 14:09:18 +0100346 printk(KERN_ERR PFX
347 "cannot register reboot notifier (err=%d)\n", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 goto unreg_regions;
349 }
350
351 ret = misc_register(&wdt_miscdev);
352 if (ret != 0) {
Alan Cox46a39492008-05-19 14:09:18 +0100353 printk(KERN_ERR PFX
354 "cannot register miscdev on minor=%d (err=%d)\n",
355 WATCHDOG_MINOR, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 goto unreg_reboot;
357 }
358
Alan Cox46a39492008-05-19 14:09:18 +0100359 printk(KERN_INFO PFX
360 "initialized. timeout=%d sec (nowayout=%d)\n",
361 timeout, nowayout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
363out:
364 return ret;
365unreg_reboot:
366 unregister_reboot_notifier(&wdt_notifier);
367unreg_regions:
368 release_region(wdt_io, 1);
369 goto out;
370}
371
Alan Cox46a39492008-05-19 14:09:18 +0100372static void __exit wdt_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373{
374 misc_deregister(&wdt_miscdev);
375 unregister_reboot_notifier(&wdt_notifier);
Alan Cox46a39492008-05-19 14:09:18 +0100376 release_region(wdt_io, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377}
378
379module_init(wdt_init);
380module_exit(wdt_exit);
381
382MODULE_LICENSE("GPL");
383MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>");
Vlad Drukker0e94f2e2007-03-25 17:34:39 +0200384MODULE_DESCRIPTION("w83627hf/thf WDT driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);