2 * w83627hf/thf WDT driver
4 * (c) Copyright 2013 Guenter Roeck
5 * converted to watchdog infrastructure
7 * (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
8 * added support for W83627THF.
10 * (c) Copyright 2003,2007 Pádraig Brady <P@draigBrady.com>
12 * Based on advantechwdt.c which is based on wdt.c.
13 * Original copyright messages:
15 * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
17 * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
18 * All Rights Reserved.
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
25 * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
26 * warranty for any of this software. This material is provided
27 * "AS-IS" and at no charge.
29 * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
32 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
34 #include <linux/module.h>
35 #include <linux/moduleparam.h>
36 #include <linux/types.h>
37 #include <linux/watchdog.h>
38 #include <linux/ioport.h>
39 #include <linux/notifier.h>
40 #include <linux/reboot.h>
41 #include <linux/init.h>
44 #define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"
45 #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
49 enum chips { w83627hf, w83627s, w83637hf, w83627thf, w83687thf,
50 w83627ehf, w83627dhg, w83627uhg, w83667hg, w83627dhg_p, w83667hg_b,
51 nct6775, nct6776, nct6779 };
53 static int timeout; /* in seconds */
54 module_param(timeout, int, 0);
55 MODULE_PARM_DESC(timeout,
56 "Watchdog timeout in seconds. 1 <= timeout <= 255, default="
57 __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
59 static bool nowayout = WATCHDOG_NOWAYOUT;
60 module_param(nowayout, bool, 0);
61 MODULE_PARM_DESC(nowayout,
62 "Watchdog cannot be stopped once started (default="
63 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
69 #define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */
70 #define WDT_EFIR (wdt_io+0) /* Extended Function Index Register
72 #define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
74 #define W83627HF_LD_WDT 0x08
76 #define W83627HF_ID 0x52
77 #define W83627S_ID 0x59
78 #define W83637HF_ID 0x70
79 #define W83627THF_ID 0x82
80 #define W83687THF_ID 0x85
81 #define W83627EHF_ID 0x88
82 #define W83627DHG_ID 0xa0
83 #define W83627UHG_ID 0xa2
84 #define W83667HG_ID 0xa5
85 #define W83627DHG_P_ID 0xb0
86 #define W83667HG_B_ID 0xb3
87 #define NCT6775_ID 0xb4
88 #define NCT6776_ID 0xc3
89 #define NCT6779_ID 0xc5
91 static void superio_outb(int reg, int val)
97 static inline int superio_inb(int reg)
100 return inb(WDT_EFDR);
103 static int superio_enter(void)
105 if (!request_muxed_region(wdt_io, 2, WATCHDOG_NAME))
108 outb_p(0x87, WDT_EFER); /* Enter extended function mode */
109 outb_p(0x87, WDT_EFER); /* Again according to manual */
114 static void superio_select(int ld)
116 superio_outb(0x07, ld);
119 static void superio_exit(void)
121 outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
122 release_region(wdt_io, 2);
125 static int w83627hf_init(struct watchdog_device *wdog, enum chips chip)
130 ret = superio_enter();
134 superio_select(W83627HF_LD_WDT);
136 /* set CR30 bit 0 to activate GPIO2 */
137 t = superio_inb(0x30);
139 superio_outb(0x30, t | 0x01);
144 t = superio_inb(0x2B) & ~0x10;
145 superio_outb(0x2B, t); /* set GPIO24 to WDT0 */
148 t = (superio_inb(0x2B) & ~0x08) | 0x04;
149 superio_outb(0x2B, t); /* set GPIO3 to WDT0 */
153 t = superio_inb(0x2D) & ~0x01; /* PIN77 -> WDT0# */
154 superio_outb(0x2D, t); /* set GPIO5 to WDT0 */
155 t = superio_inb(0xF5);
156 t |= 0x02; /* enable the WDTO# output low pulse
157 * to the KBRST# pin */
158 superio_outb(0xF5, t);
163 t = superio_inb(0x2C) & ~0x80; /* PIN47 -> WDT0# */
164 superio_outb(0x2C, t);
174 * These chips have a fixed WDTO# output pin (W83627UHG),
175 * or support more than one WDTO# output pin.
176 * Don't touch its configuration, and hope the BIOS
177 * does the right thing.
179 t = superio_inb(0xF5);
180 t |= 0x02; /* enable the WDTO# output low pulse
181 * to the KBRST# pin */
182 superio_outb(0xF5, t);
188 t = superio_inb(0xF6);
190 pr_info("Watchdog already running. Resetting timeout to %d sec\n",
192 superio_outb(0xF6, wdog->timeout);
195 /* set second mode & disable keyboard turning off watchdog */
196 t = superio_inb(0xF5) & ~0x0C;
197 superio_outb(0xF5, t);
199 /* disable keyboard & mouse turning off watchdog */
200 t = superio_inb(0xF7) & ~0xC0;
201 superio_outb(0xF7, t);
208 static int wdt_set_time(unsigned int timeout)
212 ret = superio_enter();
216 superio_select(W83627HF_LD_WDT);
217 superio_outb(0xF6, timeout);
223 static int wdt_start(struct watchdog_device *wdog)
225 return wdt_set_time(wdog->timeout);
228 static int wdt_stop(struct watchdog_device *wdog)
230 return wdt_set_time(0);
233 static int wdt_set_timeout(struct watchdog_device *wdog, unsigned int timeout)
235 wdog->timeout = timeout;
240 static unsigned int wdt_get_time(struct watchdog_device *wdog)
242 unsigned int timeleft;
245 ret = superio_enter();
249 superio_select(W83627HF_LD_WDT);
250 timeleft = superio_inb(0xF6);
257 * Notifier for system down
259 static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
262 if (code == SYS_DOWN || code == SYS_HALT)
263 wdt_set_time(0); /* Turn the WDT off */
272 static struct watchdog_info wdt_info = {
273 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
274 .identity = "W83627HF Watchdog",
277 static struct watchdog_ops wdt_ops = {
278 .owner = THIS_MODULE,
281 .set_timeout = wdt_set_timeout,
282 .get_timeleft = wdt_get_time,
285 static struct watchdog_device wdt_dev = {
288 .timeout = WATCHDOG_TIMEOUT,
294 * The WDT needs to learn about soft shutdowns in order to
295 * turn the timebomb registers off.
298 static struct notifier_block wdt_notifier = {
299 .notifier_call = wdt_notify_sys,
302 static int wdt_find(int addr)
307 ret = superio_enter();
310 superio_select(W83627HF_LD_WDT);
311 val = superio_inb(0x20);
360 pr_err("Unsupported chip ID: 0x%02x\n", val);
367 static int __init wdt_init(void)
371 const char * const chip_name[] = {
389 chip = wdt_find(0x2e);
392 chip = wdt_find(0x4e);
397 pr_info("WDT driver for %s Super I/O chip initialising\n",
400 watchdog_init_timeout(&wdt_dev, timeout, NULL);
401 watchdog_set_nowayout(&wdt_dev, nowayout);
403 ret = w83627hf_init(&wdt_dev, chip);
405 pr_err("failed to initialize watchdog (err=%d)\n", ret);
409 ret = register_reboot_notifier(&wdt_notifier);
411 pr_err("cannot register reboot notifier (err=%d)\n", ret);
415 ret = watchdog_register_device(&wdt_dev);
419 pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
420 wdt_dev.timeout, nowayout);
425 unregister_reboot_notifier(&wdt_notifier);
429 static void __exit wdt_exit(void)
431 watchdog_unregister_device(&wdt_dev);
432 unregister_reboot_notifier(&wdt_notifier);
435 module_init(wdt_init);
436 module_exit(wdt_exit);
438 MODULE_LICENSE("GPL");
439 MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>");
440 MODULE_DESCRIPTION("w83627hf/thf WDT driver");