Commit | Line | Data |
---|---|---|
f9a8c891 | 1 | /* |
de710d68 | 2 | * w83697hf/hg WDT driver |
f9a8c891 | 3 | * |
3fdee8db | 4 | * (c) Copyright 2006 Samuel Tardieu <sam@rfc1149.net> |
f9a8c891 MJ |
5 | * (c) Copyright 2006 Marcus Junker <junker@anduras.de> |
6 | * | |
de710d68 ST |
7 | * Based on w83627hf_wdt.c which is based on advantechwdt.c |
8 | * which is based on wdt.c. | |
f9a8c891 MJ |
9 | * Original copyright messages: |
10 | * | |
96de0e25 | 11 | * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com> |
f9a8c891 MJ |
12 | * |
13 | * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> | |
14 | * | |
15 | * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved. | |
16 | * http://www.redhat.com | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | * | |
23 | * Neither Marcus Junker nor ANDURAS AG admit liability nor provide | |
24 | * warranty for any of this software. This material is provided | |
25 | * "AS-IS" and at no charge. | |
26 | */ | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/moduleparam.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/miscdevice.h> | |
32 | #include <linux/watchdog.h> | |
33 | #include <linux/fs.h> | |
34 | #include <linux/ioport.h> | |
35 | #include <linux/notifier.h> | |
36 | #include <linux/reboot.h> | |
37 | #include <linux/init.h> | |
ab9d4414 | 38 | #include <linux/spinlock.h> |
f9a8c891 MJ |
39 | |
40 | #include <asm/io.h> | |
41 | #include <asm/uaccess.h> | |
42 | #include <asm/system.h> | |
43 | ||
de710d68 | 44 | #define WATCHDOG_NAME "w83697hf/hg WDT" |
f9a8c891 MJ |
45 | #define PFX WATCHDOG_NAME ": " |
46 | #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ | |
6fd65601 | 47 | #define WATCHDOG_EARLY_DISABLE 1 /* Disable until userland kicks in */ |
f9a8c891 MJ |
48 | |
49 | static unsigned long wdt_is_open; | |
50 | static char expect_close; | |
c7dfd0cc | 51 | static DEFINE_SPINLOCK(io_lock); |
f9a8c891 MJ |
52 | |
53 | /* You must set this - there is no sane way to probe for this board. */ | |
c81b2996 | 54 | static int wdt_io = 0x2e; |
f9a8c891 | 55 | module_param(wdt_io, int, 0); |
c81b2996 | 56 | MODULE_PARM_DESC(wdt_io, "w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)"); |
f9a8c891 MJ |
57 | |
58 | static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ | |
59 | module_param(timeout, int, 0); | |
5794a9f4 | 60 | MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255 (default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); |
f9a8c891 MJ |
61 | |
62 | static int nowayout = WATCHDOG_NOWAYOUT; | |
63 | module_param(nowayout, int, 0); | |
bffda5c8 | 64 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
f9a8c891 | 65 | |
6fd65601 ST |
66 | static int early_disable = WATCHDOG_EARLY_DISABLE; |
67 | module_param(early_disable, int, 0); | |
68 | MODULE_PARM_DESC(early_disable, "Watchdog gets disabled at boot time (default=" __MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")"); | |
69 | ||
f9a8c891 MJ |
70 | /* |
71 | * Kernel methods. | |
72 | */ | |
73 | ||
44d7d328 ST |
74 | #define W83697HF_EFER (wdt_io+0) /* Extended Function Enable Register */ |
75 | #define W83697HF_EFIR (wdt_io+0) /* Extended Function Index Register (same as EFER) */ | |
76 | #define W83697HF_EFDR (wdt_io+1) /* Extended Function Data Register */ | |
f9a8c891 | 77 | |
f7be3328 ST |
78 | static inline void |
79 | w83697hf_unlock(void) | |
f9a8c891 | 80 | { |
44d7d328 ST |
81 | outb_p(0x87, W83697HF_EFER); /* Enter extended function mode */ |
82 | outb_p(0x87, W83697HF_EFER); /* Again according to manual */ | |
f7be3328 ST |
83 | } |
84 | ||
fe851eba ST |
85 | static inline void |
86 | w83697hf_lock(void) | |
87 | { | |
88 | outb_p(0xAA, W83697HF_EFER); /* Leave extended function mode */ | |
89 | } | |
90 | ||
0cd54476 | 91 | /* |
d46ab596 ST |
92 | * The three functions w83697hf_get_reg(), w83697hf_set_reg() and |
93 | * w83697hf_write_timeout() must be called with the device unlocked. | |
0cd54476 ST |
94 | */ |
95 | ||
96 | static unsigned char | |
97 | w83697hf_get_reg(unsigned char reg) | |
98 | { | |
99 | outb_p(reg, W83697HF_EFIR); | |
100 | return inb_p(W83697HF_EFDR); | |
101 | } | |
102 | ||
103 | static void | |
104 | w83697hf_set_reg(unsigned char reg, unsigned char data) | |
105 | { | |
106 | outb_p(reg, W83697HF_EFIR); | |
107 | outb_p(data, W83697HF_EFDR); | |
108 | } | |
109 | ||
d46ab596 ST |
110 | static void |
111 | w83697hf_write_timeout(int timeout) | |
112 | { | |
113 | w83697hf_set_reg(0xF4, timeout); /* Write Timeout counter to CRF4 */ | |
114 | } | |
115 | ||
a7933e05 ST |
116 | static void |
117 | w83697hf_select_wdt(void) | |
118 | { | |
119 | w83697hf_unlock(); | |
120 | w83697hf_set_reg(0x07, 0x08); /* Switch to logic device 8 (GPIO2) */ | |
121 | } | |
122 | ||
123 | static inline void | |
124 | w83697hf_deselect_wdt(void) | |
125 | { | |
126 | w83697hf_lock(); | |
127 | } | |
128 | ||
f9a8c891 MJ |
129 | static void |
130 | w83697hf_init(void) | |
131 | { | |
b7b9868b | 132 | unsigned char bbuf; |
f9a8c891 | 133 | |
fa69afd3 ST |
134 | w83697hf_select_wdt(); |
135 | ||
b7b9868b ST |
136 | bbuf = w83697hf_get_reg(0x29); |
137 | bbuf &= ~0x60; | |
138 | bbuf |= 0x20; | |
139 | w83697hf_set_reg(0x29, bbuf); /* Set pin 119 to WDTO# mode (= CR29, WDT0) */ | |
f9a8c891 | 140 | |
b7b9868b ST |
141 | bbuf = w83697hf_get_reg(0xF3); |
142 | bbuf &= ~0x04; | |
143 | w83697hf_set_reg(0xF3, bbuf); /* Count mode is seconds */ | |
f9a8c891 | 144 | |
fa69afd3 | 145 | w83697hf_deselect_wdt(); |
f9a8c891 MJ |
146 | } |
147 | ||
03315adc | 148 | static void |
089d8139 | 149 | wdt_ping(void) |
f9a8c891 | 150 | { |
ab9d4414 | 151 | spin_lock(&io_lock); |
a7933e05 | 152 | w83697hf_select_wdt(); |
f9a8c891 | 153 | |
d46ab596 | 154 | w83697hf_write_timeout(timeout); |
f9a8c891 | 155 | |
a7933e05 | 156 | w83697hf_deselect_wdt(); |
ab9d4414 | 157 | spin_unlock(&io_lock); |
f9a8c891 MJ |
158 | } |
159 | ||
03315adc | 160 | static void |
089d8139 | 161 | wdt_enable(void) |
f9a8c891 | 162 | { |
089d8139 ST |
163 | spin_lock(&io_lock); |
164 | w83697hf_select_wdt(); | |
165 | ||
166 | w83697hf_write_timeout(timeout); | |
167 | w83697hf_set_reg(0x30, 1); /* Enable timer */ | |
168 | ||
169 | w83697hf_deselect_wdt(); | |
170 | spin_unlock(&io_lock); | |
f9a8c891 MJ |
171 | } |
172 | ||
03315adc | 173 | static void |
f9a8c891 MJ |
174 | wdt_disable(void) |
175 | { | |
089d8139 ST |
176 | spin_lock(&io_lock); |
177 | w83697hf_select_wdt(); | |
178 | ||
179 | w83697hf_set_reg(0x30, 0); /* Disable timer */ | |
180 | w83697hf_write_timeout(0); | |
181 | ||
182 | w83697hf_deselect_wdt(); | |
183 | spin_unlock(&io_lock); | |
f9a8c891 MJ |
184 | } |
185 | ||
6fd65601 ST |
186 | static unsigned char |
187 | wdt_running(void) | |
188 | { | |
189 | unsigned char t; | |
190 | ||
191 | spin_lock(&io_lock); | |
192 | w83697hf_select_wdt(); | |
193 | ||
194 | t = w83697hf_get_reg(0xF4); /* Read timer */ | |
195 | ||
196 | w83697hf_deselect_wdt(); | |
197 | spin_unlock(&io_lock); | |
198 | ||
199 | return t; | |
200 | } | |
201 | ||
f9a8c891 MJ |
202 | static int |
203 | wdt_set_heartbeat(int t) | |
204 | { | |
eb64419e | 205 | if ((t < 1) || (t > 255)) |
f9a8c891 MJ |
206 | return -EINVAL; |
207 | ||
208 | timeout = t; | |
209 | return 0; | |
210 | } | |
211 | ||
212 | static ssize_t | |
213 | wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
214 | { | |
215 | if (count) { | |
216 | if (!nowayout) { | |
217 | size_t i; | |
218 | ||
219 | expect_close = 0; | |
220 | ||
221 | for (i = 0; i != count; i++) { | |
222 | char c; | |
223 | if (get_user(c, buf+i)) | |
224 | return -EFAULT; | |
225 | if (c == 'V') | |
226 | expect_close = 42; | |
227 | } | |
228 | } | |
229 | wdt_ping(); | |
230 | } | |
231 | return count; | |
232 | } | |
233 | ||
234 | static int | |
235 | wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
236 | unsigned long arg) | |
237 | { | |
238 | void __user *argp = (void __user *)arg; | |
239 | int __user *p = argp; | |
240 | int new_timeout; | |
241 | static struct watchdog_info ident = { | |
242 | .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, | |
243 | .firmware_version = 1, | |
244 | .identity = "W83697HF WDT", | |
245 | }; | |
246 | ||
247 | switch (cmd) { | |
248 | case WDIOC_GETSUPPORT: | |
db16525e ST |
249 | if (copy_to_user(argp, &ident, sizeof(ident))) |
250 | return -EFAULT; | |
251 | break; | |
f9a8c891 MJ |
252 | |
253 | case WDIOC_GETSTATUS: | |
254 | case WDIOC_GETBOOTSTATUS: | |
db16525e | 255 | return put_user(0, p); |
f9a8c891 MJ |
256 | |
257 | case WDIOC_KEEPALIVE: | |
db16525e ST |
258 | wdt_ping(); |
259 | break; | |
f9a8c891 MJ |
260 | |
261 | case WDIOC_SETTIMEOUT: | |
db16525e ST |
262 | if (get_user(new_timeout, p)) |
263 | return -EFAULT; | |
264 | if (wdt_set_heartbeat(new_timeout)) | |
265 | return -EINVAL; | |
266 | wdt_ping(); | |
267 | /* Fall */ | |
f9a8c891 MJ |
268 | |
269 | case WDIOC_GETTIMEOUT: | |
db16525e | 270 | return put_user(timeout, p); |
f9a8c891 MJ |
271 | |
272 | case WDIOC_SETOPTIONS: | |
273 | { | |
db16525e | 274 | int options, retval = -EINVAL; |
f9a8c891 | 275 | |
db16525e ST |
276 | if (get_user(options, p)) |
277 | return -EFAULT; | |
f9a8c891 | 278 | |
db16525e ST |
279 | if (options & WDIOS_DISABLECARD) { |
280 | wdt_disable(); | |
281 | retval = 0; | |
282 | } | |
f9a8c891 | 283 | |
db16525e | 284 | if (options & WDIOS_ENABLECARD) { |
089d8139 | 285 | wdt_enable(); |
db16525e ST |
286 | retval = 0; |
287 | } | |
f9a8c891 | 288 | |
db16525e | 289 | return retval; |
f9a8c891 MJ |
290 | } |
291 | ||
292 | default: | |
db16525e | 293 | return -ENOTTY; |
f9a8c891 MJ |
294 | } |
295 | return 0; | |
296 | } | |
297 | ||
298 | static int | |
299 | wdt_open(struct inode *inode, struct file *file) | |
300 | { | |
301 | if (test_and_set_bit(0, &wdt_is_open)) | |
302 | return -EBUSY; | |
303 | /* | |
304 | * Activate | |
305 | */ | |
306 | ||
089d8139 | 307 | wdt_enable(); |
f9a8c891 MJ |
308 | return nonseekable_open(inode, file); |
309 | } | |
310 | ||
311 | static int | |
312 | wdt_close(struct inode *inode, struct file *file) | |
313 | { | |
314 | if (expect_close == 42) { | |
315 | wdt_disable(); | |
316 | } else { | |
db16525e | 317 | printk (KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); |
f9a8c891 MJ |
318 | wdt_ping(); |
319 | } | |
320 | expect_close = 0; | |
321 | clear_bit(0, &wdt_is_open); | |
322 | return 0; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Notifier for system down | |
327 | */ | |
328 | ||
329 | static int | |
330 | wdt_notify_sys(struct notifier_block *this, unsigned long code, | |
331 | void *unused) | |
332 | { | |
333 | if (code == SYS_DOWN || code == SYS_HALT) { | |
334 | /* Turn the WDT off */ | |
335 | wdt_disable(); | |
336 | } | |
337 | return NOTIFY_DONE; | |
338 | } | |
339 | ||
340 | /* | |
341 | * Kernel Interfaces | |
342 | */ | |
343 | ||
2b8693c0 | 344 | static const struct file_operations wdt_fops = { |
f9a8c891 MJ |
345 | .owner = THIS_MODULE, |
346 | .llseek = no_llseek, | |
347 | .write = wdt_write, | |
348 | .ioctl = wdt_ioctl, | |
349 | .open = wdt_open, | |
350 | .release = wdt_close, | |
351 | }; | |
352 | ||
353 | static struct miscdevice wdt_miscdev = { | |
354 | .minor = WATCHDOG_MINOR, | |
355 | .name = "watchdog", | |
356 | .fops = &wdt_fops, | |
357 | }; | |
358 | ||
359 | /* | |
360 | * The WDT needs to learn about soft shutdowns in order to | |
361 | * turn the timebomb registers off. | |
362 | */ | |
363 | ||
364 | static struct notifier_block wdt_notifier = { | |
365 | .notifier_call = wdt_notify_sys, | |
366 | }; | |
367 | ||
c81b2996 ST |
368 | static int |
369 | w83697hf_check_wdt(void) | |
370 | { | |
371 | if (!request_region(wdt_io, 2, WATCHDOG_NAME)) { | |
372 | printk (KERN_ERR PFX "I/O address 0x%x already in use\n", wdt_io); | |
373 | return -EIO; | |
374 | } | |
375 | ||
376 | printk (KERN_DEBUG PFX "Looking for watchdog at address 0x%x\n", wdt_io); | |
377 | w83697hf_unlock(); | |
378 | if (w83697hf_get_reg(0x20) == 0x60) { | |
379 | printk (KERN_INFO PFX "watchdog found at address 0x%x\n", wdt_io); | |
380 | w83697hf_lock(); | |
381 | return 0; | |
382 | } | |
383 | w83697hf_lock(); /* Reprotect in case it was a compatible device */ | |
384 | ||
385 | printk (KERN_INFO PFX "watchdog not found at address 0x%x\n", wdt_io); | |
386 | release_region(wdt_io, 2); | |
387 | return -EIO; | |
388 | } | |
389 | ||
e223f01a WVS |
390 | static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 }; |
391 | ||
f9a8c891 MJ |
392 | static int __init |
393 | wdt_init(void) | |
394 | { | |
e223f01a | 395 | int ret, i, found = 0; |
f9a8c891 | 396 | |
de710d68 | 397 | printk (KERN_INFO PFX "WDT driver for W83697HF/HG initializing\n"); |
f9a8c891 | 398 | |
e223f01a WVS |
399 | if (wdt_io == 0) { |
400 | /* we will autodetect the W83697HF/HG watchdog */ | |
401 | for (i = 0; ((!found) && (w83697hf_ioports[i] != 0)); i++) { | |
402 | wdt_io = w83697hf_ioports[i]; | |
cde10ba3 | 403 | if (!w83697hf_check_wdt()) |
e223f01a WVS |
404 | found++; |
405 | } | |
406 | } else { | |
c81b2996 | 407 | if (!w83697hf_check_wdt()) |
e223f01a | 408 | found++; |
c81b2996 ST |
409 | } |
410 | ||
e223f01a WVS |
411 | if (!found) { |
412 | printk (KERN_ERR PFX "No W83697HF/HG could be found\n"); | |
413 | ret = -EIO; | |
414 | goto out; | |
415 | } | |
c81b2996 | 416 | |
fa69afd3 | 417 | w83697hf_init(); |
6fd65601 ST |
418 | if (early_disable) { |
419 | if (wdt_running()) | |
420 | printk (KERN_WARNING PFX "Stopping previously enabled watchdog until userland kicks in\n"); | |
421 | wdt_disable(); | |
422 | } | |
c81b2996 | 423 | |
f9a8c891 MJ |
424 | if (wdt_set_heartbeat(timeout)) { |
425 | wdt_set_heartbeat(WATCHDOG_TIMEOUT); | |
eb64419e | 426 | printk (KERN_INFO PFX "timeout value must be 1<=timeout<=255, using %d\n", |
f9a8c891 MJ |
427 | WATCHDOG_TIMEOUT); |
428 | } | |
429 | ||
f9a8c891 MJ |
430 | ret = register_reboot_notifier(&wdt_notifier); |
431 | if (ret != 0) { | |
432 | printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", | |
433 | ret); | |
434 | goto unreg_regions; | |
435 | } | |
436 | ||
437 | ret = misc_register(&wdt_miscdev); | |
438 | if (ret != 0) { | |
439 | printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
440 | WATCHDOG_MINOR, ret); | |
441 | goto unreg_reboot; | |
442 | } | |
443 | ||
444 | printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n", | |
445 | timeout, nowayout); | |
446 | ||
447 | out: | |
448 | return ret; | |
449 | unreg_reboot: | |
450 | unregister_reboot_notifier(&wdt_notifier); | |
451 | unreg_regions: | |
b41a9f59 | 452 | release_region(wdt_io, 2); |
f9a8c891 MJ |
453 | goto out; |
454 | } | |
455 | ||
456 | static void __exit | |
457 | wdt_exit(void) | |
458 | { | |
459 | misc_deregister(&wdt_miscdev); | |
460 | unregister_reboot_notifier(&wdt_notifier); | |
b41a9f59 | 461 | release_region(wdt_io, 2); |
f9a8c891 MJ |
462 | } |
463 | ||
464 | module_init(wdt_init); | |
465 | module_exit(wdt_exit); | |
466 | ||
467 | MODULE_LICENSE("GPL"); | |
3fdee8db | 468 | MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, Samuel Tardieu <sam@rfc1149.net>"); |
de710d68 | 469 | MODULE_DESCRIPTION("w83697hf/hg WDT driver"); |
f9a8c891 | 470 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |