Root/
1 | /* |
2 | * w83627hf/thf WDT driver |
3 | * |
4 | * (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com> |
5 | * added support for W83627THF. |
6 | * |
7 | * (c) Copyright 2003,2007 Pádraig Brady <P@draigBrady.com> |
8 | * |
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 | * |
14 | * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>, |
15 | * All Rights Reserved. |
16 | * |
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 | * |
26 | * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk> |
27 | */ |
28 | |
29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
30 | |
31 | #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> |
41 | #include <linux/spinlock.h> |
42 | #include <linux/io.h> |
43 | #include <linux/uaccess.h> |
44 | |
45 | |
46 | #define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT" |
47 | #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ |
48 | |
49 | static unsigned long wdt_is_open; |
50 | static char expect_close; |
51 | static DEFINE_SPINLOCK(io_lock); |
52 | |
53 | /* You must set this - there is no sane way to probe for this board. */ |
54 | static int wdt_io = 0x2E; |
55 | module_param(wdt_io, int, 0); |
56 | MODULE_PARM_DESC(wdt_io, "w83627hf/thf WDT io port (default 0x2E)"); |
57 | |
58 | static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ |
59 | module_param(timeout, int, 0); |
60 | MODULE_PARM_DESC(timeout, |
61 | "Watchdog timeout in seconds. 1 <= timeout <= 255, default=" |
62 | __MODULE_STRING(WATCHDOG_TIMEOUT) "."); |
63 | |
64 | static bool nowayout = WATCHDOG_NOWAYOUT; |
65 | module_param(nowayout, bool, 0); |
66 | MODULE_PARM_DESC(nowayout, |
67 | "Watchdog cannot be stopped once started (default=" |
68 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
69 | |
70 | /* |
71 | * Kernel methods. |
72 | */ |
73 | |
74 | #define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */ |
75 | #define WDT_EFIR (wdt_io+0) /* Extended Function Index Register |
76 | (same as EFER) */ |
77 | #define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */ |
78 | |
79 | static void w83627hf_select_wd_register(void) |
80 | { |
81 | unsigned char c; |
82 | outb_p(0x87, WDT_EFER); /* Enter extended function mode */ |
83 | outb_p(0x87, WDT_EFER); /* Again according to manual */ |
84 | |
85 | outb(0x20, WDT_EFER); /* check chip version */ |
86 | c = inb(WDT_EFDR); |
87 | if (c == 0x82) { /* W83627THF */ |
88 | 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 | } else if (c == 0x88 || c == 0xa0) { /* W83627EHF / W83627DHG */ |
93 | 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 */ |
97 | } |
98 | |
99 | 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 | |
105 | static void w83627hf_unselect_wd_register(void) |
106 | { |
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. */ |
112 | |
113 | static void w83627hf_init(void) |
114 | { |
115 | unsigned char t; |
116 | |
117 | w83627hf_select_wd_register(); |
118 | |
119 | outb_p(0xF6, WDT_EFER); /* Select CRF6 */ |
120 | t = inb_p(WDT_EFDR); /* read CRF6 */ |
121 | if (t != 0) { |
122 | pr_info("Watchdog already running. Resetting timeout to %d sec\n", |
123 | timeout); |
124 | outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */ |
125 | } |
126 | |
127 | outb_p(0xF5, WDT_EFER); /* Select CRF5 */ |
128 | t = inb_p(WDT_EFDR); /* read CRF5 */ |
129 | t &= ~0x0C; /* set second mode & disable keyboard |
130 | turning off watchdog */ |
131 | t |= 0x02; /* enable the WDTO# output low pulse |
132 | to the KBRST# pin (PIN60) */ |
133 | outb_p(t, WDT_EFDR); /* Write back to CRF5 */ |
134 | |
135 | outb_p(0xF7, WDT_EFER); /* Select CRF7 */ |
136 | t = inb_p(WDT_EFDR); /* read CRF7 */ |
137 | t &= ~0xC0; /* disable keyboard & mouse turning off |
138 | watchdog */ |
139 | outb_p(t, WDT_EFDR); /* Write back to CRF7 */ |
140 | |
141 | w83627hf_unselect_wd_register(); |
142 | } |
143 | |
144 | static void wdt_set_time(int timeout) |
145 | { |
146 | spin_lock(&io_lock); |
147 | |
148 | 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(); |
154 | |
155 | spin_unlock(&io_lock); |
156 | } |
157 | |
158 | static int wdt_ping(void) |
159 | { |
160 | wdt_set_time(timeout); |
161 | return 0; |
162 | } |
163 | |
164 | static int wdt_disable(void) |
165 | { |
166 | wdt_set_time(0); |
167 | return 0; |
168 | } |
169 | |
170 | static int wdt_set_heartbeat(int t) |
171 | { |
172 | if (t < 1 || t > 255) |
173 | return -EINVAL; |
174 | timeout = t; |
175 | return 0; |
176 | } |
177 | |
178 | static 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 | |
196 | static ssize_t wdt_write(struct file *file, const char __user *buf, |
197 | size_t count, loff_t *ppos) |
198 | { |
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; |
207 | if (get_user(c, buf + i)) |
208 | return -EFAULT; |
209 | if (c == 'V') |
210 | expect_close = 42; |
211 | } |
212 | } |
213 | wdt_ping(); |
214 | } |
215 | return count; |
216 | } |
217 | |
218 | static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
219 | { |
220 | void __user *argp = (void __user *)arg; |
221 | int __user *p = argp; |
222 | int timeval; |
223 | static const struct watchdog_info ident = { |
224 | .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | |
225 | WDIOF_MAGICCLOSE, |
226 | .firmware_version = 1, |
227 | .identity = "W83627HF WDT", |
228 | }; |
229 | |
230 | switch (cmd) { |
231 | case WDIOC_GETSUPPORT: |
232 | if (copy_to_user(argp, &ident, sizeof(ident))) |
233 | return -EFAULT; |
234 | break; |
235 | case WDIOC_GETSTATUS: |
236 | case WDIOC_GETBOOTSTATUS: |
237 | return put_user(0, p); |
238 | case WDIOC_SETOPTIONS: |
239 | { |
240 | int options, retval = -EINVAL; |
241 | |
242 | 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; |
253 | } |
254 | case WDIOC_KEEPALIVE: |
255 | wdt_ping(); |
256 | break; |
257 | case WDIOC_SETTIMEOUT: |
258 | if (get_user(timeval, p)) |
259 | return -EFAULT; |
260 | if (wdt_set_heartbeat(timeval)) |
261 | return -EINVAL; |
262 | wdt_ping(); |
263 | /* Fall */ |
264 | case WDIOC_GETTIMEOUT: |
265 | return put_user(timeout, p); |
266 | case WDIOC_GETTIMELEFT: |
267 | timeval = wdt_get_time(); |
268 | return put_user(timeval, p); |
269 | default: |
270 | return -ENOTTY; |
271 | } |
272 | return 0; |
273 | } |
274 | |
275 | static int wdt_open(struct inode *inode, struct file *file) |
276 | { |
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 | |
287 | static int wdt_close(struct inode *inode, struct file *file) |
288 | { |
289 | if (expect_close == 42) |
290 | wdt_disable(); |
291 | else { |
292 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
293 | 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 | |
304 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, |
305 | void *unused) |
306 | { |
307 | if (code == SYS_DOWN || code == SYS_HALT) |
308 | wdt_disable(); /* Turn the WDT off */ |
309 | |
310 | return NOTIFY_DONE; |
311 | } |
312 | |
313 | /* |
314 | * Kernel Interfaces |
315 | */ |
316 | |
317 | static const struct file_operations wdt_fops = { |
318 | .owner = THIS_MODULE, |
319 | .llseek = no_llseek, |
320 | .write = wdt_write, |
321 | .unlocked_ioctl = wdt_ioctl, |
322 | .open = wdt_open, |
323 | .release = wdt_close, |
324 | }; |
325 | |
326 | static 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 | |
337 | static struct notifier_block wdt_notifier = { |
338 | .notifier_call = wdt_notify_sys, |
339 | }; |
340 | |
341 | static int __init wdt_init(void) |
342 | { |
343 | int ret; |
344 | |
345 | pr_info("WDT driver for the Winbond(TM) W83627HF/THF/HG/DHG Super I/O chip initialising\n"); |
346 | |
347 | if (wdt_set_heartbeat(timeout)) { |
348 | wdt_set_heartbeat(WATCHDOG_TIMEOUT); |
349 | pr_info("timeout value must be 1 <= timeout <= 255, using %d\n", |
350 | WATCHDOG_TIMEOUT); |
351 | } |
352 | |
353 | if (!request_region(wdt_io, 1, WATCHDOG_NAME)) { |
354 | pr_err("I/O address 0x%04x already in use\n", wdt_io); |
355 | ret = -EIO; |
356 | goto out; |
357 | } |
358 | |
359 | w83627hf_init(); |
360 | |
361 | ret = register_reboot_notifier(&wdt_notifier); |
362 | if (ret != 0) { |
363 | pr_err("cannot register reboot notifier (err=%d)\n", ret); |
364 | goto unreg_regions; |
365 | } |
366 | |
367 | ret = misc_register(&wdt_miscdev); |
368 | if (ret != 0) { |
369 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
370 | WATCHDOG_MINOR, ret); |
371 | goto unreg_reboot; |
372 | } |
373 | |
374 | pr_info("initialized. timeout=%d sec (nowayout=%d)\n", |
375 | timeout, nowayout); |
376 | |
377 | out: |
378 | return ret; |
379 | unreg_reboot: |
380 | unregister_reboot_notifier(&wdt_notifier); |
381 | unreg_regions: |
382 | release_region(wdt_io, 1); |
383 | goto out; |
384 | } |
385 | |
386 | static void __exit wdt_exit(void) |
387 | { |
388 | misc_deregister(&wdt_miscdev); |
389 | unregister_reboot_notifier(&wdt_notifier); |
390 | release_region(wdt_io, 1); |
391 | } |
392 | |
393 | module_init(wdt_init); |
394 | module_exit(wdt_exit); |
395 | |
396 | MODULE_LICENSE("GPL"); |
397 | MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>"); |
398 | MODULE_DESCRIPTION("w83627hf/thf WDT driver"); |
399 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
400 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9