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Commit | Line | Data |
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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 | * | |
29fa0586 AC |
15 | * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>, |
16 | * All Rights Reserved. | |
f9a8c891 MJ |
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 | ||
27c766aa JP |
28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
29 | ||
f9a8c891 MJ |
30 | #include <linux/module.h> |
31 | #include <linux/moduleparam.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/miscdevice.h> | |
34 | #include <linux/watchdog.h> | |
35 | #include <linux/fs.h> | |
36 | #include <linux/ioport.h> | |
37 | #include <linux/notifier.h> | |
38 | #include <linux/reboot.h> | |
39 | #include <linux/init.h> | |
ab9d4414 | 40 | #include <linux/spinlock.h> |
c1c8dd39 AC |
41 | #include <linux/io.h> |
42 | #include <linux/uaccess.h> | |
f9a8c891 | 43 | |
f9a8c891 MJ |
44 | #include <asm/system.h> |
45 | ||
de710d68 | 46 | #define WATCHDOG_NAME "w83697hf/hg WDT" |
f9a8c891 | 47 | #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ |
6fd65601 | 48 | #define WATCHDOG_EARLY_DISABLE 1 /* Disable until userland kicks in */ |
f9a8c891 MJ |
49 | |
50 | static unsigned long wdt_is_open; | |
51 | static char expect_close; | |
c7dfd0cc | 52 | static DEFINE_SPINLOCK(io_lock); |
f9a8c891 MJ |
53 | |
54 | /* You must set this - there is no sane way to probe for this board. */ | |
c81b2996 | 55 | static int wdt_io = 0x2e; |
f9a8c891 | 56 | module_param(wdt_io, int, 0); |
c1c8dd39 AC |
57 | MODULE_PARM_DESC(wdt_io, |
58 | "w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)"); | |
f9a8c891 MJ |
59 | |
60 | static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ | |
61 | module_param(timeout, int, 0); | |
c1c8dd39 AC |
62 | MODULE_PARM_DESC(timeout, |
63 | "Watchdog timeout in seconds. 1<= timeout <=255 (default=" | |
64 | __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); | |
f9a8c891 | 65 | |
86a1e189 WVS |
66 | static bool nowayout = WATCHDOG_NOWAYOUT; |
67 | module_param(nowayout, bool, 0); | |
c1c8dd39 AC |
68 | MODULE_PARM_DESC(nowayout, |
69 | "Watchdog cannot be stopped once started (default=" | |
70 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
f9a8c891 | 71 | |
6fd65601 ST |
72 | static int early_disable = WATCHDOG_EARLY_DISABLE; |
73 | module_param(early_disable, int, 0); | |
c1c8dd39 AC |
74 | MODULE_PARM_DESC(early_disable, |
75 | "Watchdog gets disabled at boot time (default=" | |
76 | __MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")"); | |
6fd65601 | 77 | |
f9a8c891 MJ |
78 | /* |
79 | * Kernel methods. | |
80 | */ | |
81 | ||
c1c8dd39 AC |
82 | #define W83697HF_EFER (wdt_io + 0) /* Extended Function Enable Register */ |
83 | #define W83697HF_EFIR (wdt_io + 0) /* Extended Function Index Register | |
84 | (same as EFER) */ | |
85 | #define W83697HF_EFDR (wdt_io + 1) /* Extended Function Data Register */ | |
f9a8c891 | 86 | |
c1c8dd39 | 87 | static inline void w83697hf_unlock(void) |
f9a8c891 | 88 | { |
44d7d328 ST |
89 | outb_p(0x87, W83697HF_EFER); /* Enter extended function mode */ |
90 | outb_p(0x87, W83697HF_EFER); /* Again according to manual */ | |
f7be3328 ST |
91 | } |
92 | ||
c1c8dd39 | 93 | static inline void w83697hf_lock(void) |
fe851eba ST |
94 | { |
95 | outb_p(0xAA, W83697HF_EFER); /* Leave extended function mode */ | |
96 | } | |
97 | ||
0cd54476 | 98 | /* |
d46ab596 ST |
99 | * The three functions w83697hf_get_reg(), w83697hf_set_reg() and |
100 | * w83697hf_write_timeout() must be called with the device unlocked. | |
0cd54476 ST |
101 | */ |
102 | ||
c1c8dd39 | 103 | static unsigned char w83697hf_get_reg(unsigned char reg) |
0cd54476 ST |
104 | { |
105 | outb_p(reg, W83697HF_EFIR); | |
106 | return inb_p(W83697HF_EFDR); | |
107 | } | |
108 | ||
c1c8dd39 | 109 | static void w83697hf_set_reg(unsigned char reg, unsigned char data) |
0cd54476 ST |
110 | { |
111 | outb_p(reg, W83697HF_EFIR); | |
112 | outb_p(data, W83697HF_EFDR); | |
113 | } | |
114 | ||
c1c8dd39 | 115 | static void w83697hf_write_timeout(int timeout) |
d46ab596 | 116 | { |
c1c8dd39 AC |
117 | /* Write Timeout counter to CRF4 */ |
118 | w83697hf_set_reg(0xF4, timeout); | |
d46ab596 ST |
119 | } |
120 | ||
c1c8dd39 | 121 | static void w83697hf_select_wdt(void) |
a7933e05 ST |
122 | { |
123 | w83697hf_unlock(); | |
124 | w83697hf_set_reg(0x07, 0x08); /* Switch to logic device 8 (GPIO2) */ | |
125 | } | |
126 | ||
c1c8dd39 | 127 | static inline void w83697hf_deselect_wdt(void) |
a7933e05 ST |
128 | { |
129 | w83697hf_lock(); | |
130 | } | |
131 | ||
c1c8dd39 | 132 | static void w83697hf_init(void) |
f9a8c891 | 133 | { |
b7b9868b | 134 | unsigned char bbuf; |
f9a8c891 | 135 | |
fa69afd3 ST |
136 | w83697hf_select_wdt(); |
137 | ||
b7b9868b ST |
138 | bbuf = w83697hf_get_reg(0x29); |
139 | bbuf &= ~0x60; | |
140 | bbuf |= 0x20; | |
c1c8dd39 AC |
141 | |
142 | /* Set pin 119 to WDTO# mode (= CR29, WDT0) */ | |
143 | w83697hf_set_reg(0x29, bbuf); | |
f9a8c891 | 144 | |
b7b9868b ST |
145 | bbuf = w83697hf_get_reg(0xF3); |
146 | bbuf &= ~0x04; | |
147 | w83697hf_set_reg(0xF3, bbuf); /* Count mode is seconds */ | |
f9a8c891 | 148 | |
fa69afd3 | 149 | w83697hf_deselect_wdt(); |
f9a8c891 MJ |
150 | } |
151 | ||
c1c8dd39 | 152 | static void wdt_ping(void) |
f9a8c891 | 153 | { |
ab9d4414 | 154 | spin_lock(&io_lock); |
a7933e05 | 155 | w83697hf_select_wdt(); |
f9a8c891 | 156 | |
d46ab596 | 157 | w83697hf_write_timeout(timeout); |
f9a8c891 | 158 | |
a7933e05 | 159 | w83697hf_deselect_wdt(); |
ab9d4414 | 160 | spin_unlock(&io_lock); |
f9a8c891 MJ |
161 | } |
162 | ||
c1c8dd39 | 163 | static void wdt_enable(void) |
f9a8c891 | 164 | { |
089d8139 ST |
165 | spin_lock(&io_lock); |
166 | w83697hf_select_wdt(); | |
167 | ||
168 | w83697hf_write_timeout(timeout); | |
169 | w83697hf_set_reg(0x30, 1); /* Enable timer */ | |
170 | ||
171 | w83697hf_deselect_wdt(); | |
172 | spin_unlock(&io_lock); | |
f9a8c891 MJ |
173 | } |
174 | ||
c1c8dd39 | 175 | static void wdt_disable(void) |
f9a8c891 | 176 | { |
089d8139 ST |
177 | spin_lock(&io_lock); |
178 | w83697hf_select_wdt(); | |
179 | ||
180 | w83697hf_set_reg(0x30, 0); /* Disable timer */ | |
181 | w83697hf_write_timeout(0); | |
182 | ||
183 | w83697hf_deselect_wdt(); | |
184 | spin_unlock(&io_lock); | |
f9a8c891 MJ |
185 | } |
186 | ||
c1c8dd39 | 187 | static unsigned char wdt_running(void) |
6fd65601 ST |
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 | ||
c1c8dd39 | 202 | static int wdt_set_heartbeat(int t) |
f9a8c891 | 203 | { |
c1c8dd39 | 204 | if (t < 1 || t > 255) |
f9a8c891 MJ |
205 | return -EINVAL; |
206 | ||
207 | timeout = t; | |
208 | return 0; | |
209 | } | |
210 | ||
c1c8dd39 AC |
211 | static ssize_t wdt_write(struct file *file, const char __user *buf, |
212 | size_t count, loff_t *ppos) | |
f9a8c891 MJ |
213 | { |
214 | if (count) { | |
215 | if (!nowayout) { | |
216 | size_t i; | |
217 | ||
218 | expect_close = 0; | |
219 | ||
220 | for (i = 0; i != count; i++) { | |
221 | char c; | |
7944d3a5 | 222 | if (get_user(c, buf + i)) |
f9a8c891 MJ |
223 | return -EFAULT; |
224 | if (c == 'V') | |
225 | expect_close = 42; | |
226 | } | |
227 | } | |
228 | wdt_ping(); | |
229 | } | |
230 | return count; | |
231 | } | |
232 | ||
c1c8dd39 | 233 | static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
f9a8c891 MJ |
234 | { |
235 | void __user *argp = (void __user *)arg; | |
236 | int __user *p = argp; | |
237 | int new_timeout; | |
c1c8dd39 AC |
238 | static const struct watchdog_info ident = { |
239 | .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | |
240 | | WDIOF_MAGICCLOSE, | |
f9a8c891 MJ |
241 | .firmware_version = 1, |
242 | .identity = "W83697HF WDT", | |
243 | }; | |
244 | ||
245 | switch (cmd) { | |
246 | case WDIOC_GETSUPPORT: | |
db16525e ST |
247 | if (copy_to_user(argp, &ident, sizeof(ident))) |
248 | return -EFAULT; | |
249 | break; | |
f9a8c891 MJ |
250 | |
251 | case WDIOC_GETSTATUS: | |
252 | case WDIOC_GETBOOTSTATUS: | |
db16525e | 253 | return put_user(0, p); |
f9a8c891 | 254 | |
f9a8c891 MJ |
255 | case WDIOC_SETOPTIONS: |
256 | { | |
db16525e | 257 | int options, retval = -EINVAL; |
f9a8c891 | 258 | |
db16525e ST |
259 | if (get_user(options, p)) |
260 | return -EFAULT; | |
f9a8c891 | 261 | |
db16525e ST |
262 | if (options & WDIOS_DISABLECARD) { |
263 | wdt_disable(); | |
264 | retval = 0; | |
265 | } | |
f9a8c891 | 266 | |
db16525e | 267 | if (options & WDIOS_ENABLECARD) { |
089d8139 | 268 | wdt_enable(); |
db16525e ST |
269 | retval = 0; |
270 | } | |
f9a8c891 | 271 | |
db16525e | 272 | return retval; |
f9a8c891 MJ |
273 | } |
274 | ||
0c06090c WVS |
275 | case WDIOC_KEEPALIVE: |
276 | wdt_ping(); | |
277 | break; | |
278 | ||
279 | case WDIOC_SETTIMEOUT: | |
280 | if (get_user(new_timeout, p)) | |
281 | return -EFAULT; | |
282 | if (wdt_set_heartbeat(new_timeout)) | |
283 | return -EINVAL; | |
284 | wdt_ping(); | |
285 | /* Fall */ | |
286 | ||
287 | case WDIOC_GETTIMEOUT: | |
288 | return put_user(timeout, p); | |
289 | ||
f9a8c891 | 290 | default: |
db16525e | 291 | return -ENOTTY; |
f9a8c891 MJ |
292 | } |
293 | return 0; | |
294 | } | |
295 | ||
c1c8dd39 | 296 | static int wdt_open(struct inode *inode, struct file *file) |
f9a8c891 MJ |
297 | { |
298 | if (test_and_set_bit(0, &wdt_is_open)) | |
299 | return -EBUSY; | |
300 | /* | |
301 | * Activate | |
302 | */ | |
303 | ||
089d8139 | 304 | wdt_enable(); |
f9a8c891 MJ |
305 | return nonseekable_open(inode, file); |
306 | } | |
307 | ||
c1c8dd39 | 308 | static int wdt_close(struct inode *inode, struct file *file) |
f9a8c891 | 309 | { |
c1c8dd39 | 310 | if (expect_close == 42) |
f9a8c891 | 311 | wdt_disable(); |
c1c8dd39 | 312 | else { |
27c766aa | 313 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
f9a8c891 MJ |
314 | wdt_ping(); |
315 | } | |
316 | expect_close = 0; | |
317 | clear_bit(0, &wdt_is_open); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Notifier for system down | |
323 | */ | |
324 | ||
c1c8dd39 | 325 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, |
f9a8c891 MJ |
326 | void *unused) |
327 | { | |
7944d3a5 WVS |
328 | if (code == SYS_DOWN || code == SYS_HALT) |
329 | wdt_disable(); /* Turn the WDT off */ | |
330 | ||
f9a8c891 MJ |
331 | return NOTIFY_DONE; |
332 | } | |
333 | ||
334 | /* | |
335 | * Kernel Interfaces | |
336 | */ | |
337 | ||
2b8693c0 | 338 | static const struct file_operations wdt_fops = { |
f9a8c891 MJ |
339 | .owner = THIS_MODULE, |
340 | .llseek = no_llseek, | |
341 | .write = wdt_write, | |
c1c8dd39 | 342 | .unlocked_ioctl = wdt_ioctl, |
f9a8c891 MJ |
343 | .open = wdt_open, |
344 | .release = wdt_close, | |
345 | }; | |
346 | ||
347 | static struct miscdevice wdt_miscdev = { | |
348 | .minor = WATCHDOG_MINOR, | |
349 | .name = "watchdog", | |
350 | .fops = &wdt_fops, | |
351 | }; | |
352 | ||
353 | /* | |
354 | * The WDT needs to learn about soft shutdowns in order to | |
355 | * turn the timebomb registers off. | |
356 | */ | |
357 | ||
358 | static struct notifier_block wdt_notifier = { | |
359 | .notifier_call = wdt_notify_sys, | |
360 | }; | |
361 | ||
c1c8dd39 | 362 | static int w83697hf_check_wdt(void) |
c81b2996 ST |
363 | { |
364 | if (!request_region(wdt_io, 2, WATCHDOG_NAME)) { | |
27c766aa | 365 | pr_err("I/O address 0x%x already in use\n", wdt_io); |
c81b2996 ST |
366 | return -EIO; |
367 | } | |
368 | ||
27c766aa | 369 | pr_debug("Looking for watchdog at address 0x%x\n", wdt_io); |
c81b2996 ST |
370 | w83697hf_unlock(); |
371 | if (w83697hf_get_reg(0x20) == 0x60) { | |
27c766aa | 372 | pr_info("watchdog found at address 0x%x\n", wdt_io); |
c81b2996 ST |
373 | w83697hf_lock(); |
374 | return 0; | |
375 | } | |
c1c8dd39 AC |
376 | /* Reprotect in case it was a compatible device */ |
377 | w83697hf_lock(); | |
c81b2996 | 378 | |
27c766aa | 379 | pr_info("watchdog not found at address 0x%x\n", wdt_io); |
c81b2996 ST |
380 | release_region(wdt_io, 2); |
381 | return -EIO; | |
382 | } | |
383 | ||
e223f01a WVS |
384 | static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 }; |
385 | ||
c1c8dd39 | 386 | static int __init wdt_init(void) |
f9a8c891 | 387 | { |
e223f01a | 388 | int ret, i, found = 0; |
f9a8c891 | 389 | |
27c766aa | 390 | pr_info("WDT driver for W83697HF/HG initializing\n"); |
f9a8c891 | 391 | |
e223f01a WVS |
392 | if (wdt_io == 0) { |
393 | /* we will autodetect the W83697HF/HG watchdog */ | |
394 | for (i = 0; ((!found) && (w83697hf_ioports[i] != 0)); i++) { | |
395 | wdt_io = w83697hf_ioports[i]; | |
cde10ba3 | 396 | if (!w83697hf_check_wdt()) |
e223f01a WVS |
397 | found++; |
398 | } | |
399 | } else { | |
c81b2996 | 400 | if (!w83697hf_check_wdt()) |
e223f01a | 401 | found++; |
c81b2996 ST |
402 | } |
403 | ||
e223f01a | 404 | if (!found) { |
27c766aa | 405 | pr_err("No W83697HF/HG could be found\n"); |
e223f01a WVS |
406 | ret = -EIO; |
407 | goto out; | |
408 | } | |
c81b2996 | 409 | |
fa69afd3 | 410 | w83697hf_init(); |
6fd65601 ST |
411 | if (early_disable) { |
412 | if (wdt_running()) | |
27c766aa | 413 | pr_warn("Stopping previously enabled watchdog until userland kicks in\n"); |
6fd65601 ST |
414 | wdt_disable(); |
415 | } | |
c81b2996 | 416 | |
f9a8c891 MJ |
417 | if (wdt_set_heartbeat(timeout)) { |
418 | wdt_set_heartbeat(WATCHDOG_TIMEOUT); | |
27c766aa JP |
419 | pr_info("timeout value must be 1 <= timeout <= 255, using %d\n", |
420 | WATCHDOG_TIMEOUT); | |
f9a8c891 MJ |
421 | } |
422 | ||
f9a8c891 MJ |
423 | ret = register_reboot_notifier(&wdt_notifier); |
424 | if (ret != 0) { | |
27c766aa | 425 | pr_err("cannot register reboot notifier (err=%d)\n", ret); |
f9a8c891 MJ |
426 | goto unreg_regions; |
427 | } | |
428 | ||
429 | ret = misc_register(&wdt_miscdev); | |
430 | if (ret != 0) { | |
27c766aa JP |
431 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
432 | WATCHDOG_MINOR, ret); | |
f9a8c891 MJ |
433 | goto unreg_reboot; |
434 | } | |
435 | ||
27c766aa | 436 | pr_info("initialized. timeout=%d sec (nowayout=%d)\n", |
f9a8c891 MJ |
437 | timeout, nowayout); |
438 | ||
439 | out: | |
440 | return ret; | |
441 | unreg_reboot: | |
442 | unregister_reboot_notifier(&wdt_notifier); | |
443 | unreg_regions: | |
b41a9f59 | 444 | release_region(wdt_io, 2); |
f9a8c891 MJ |
445 | goto out; |
446 | } | |
447 | ||
c1c8dd39 | 448 | static void __exit wdt_exit(void) |
f9a8c891 MJ |
449 | { |
450 | misc_deregister(&wdt_miscdev); | |
451 | unregister_reboot_notifier(&wdt_notifier); | |
b41a9f59 | 452 | release_region(wdt_io, 2); |
f9a8c891 MJ |
453 | } |
454 | ||
455 | module_init(wdt_init); | |
456 | module_exit(wdt_exit); | |
457 | ||
458 | MODULE_LICENSE("GPL"); | |
143a2e54 WVS |
459 | MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, " |
460 | "Samuel Tardieu <sam@rfc1149.net>"); | |
de710d68 | 461 | MODULE_DESCRIPTION("w83697hf/hg WDT driver"); |
f9a8c891 | 462 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |