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1 | /* |
2 | * Wdt977 0.04: A Watchdog Device for Netwinder W83977AF chip |
3 | * |
4 | * (c) Copyright 1998 Rebel.com (Woody Suwalski <woody@netwinder.org>) |
5 | * |
6 | * ----------------------- |
7 | * |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License |
10 | * as published by the Free Software Foundation; either version |
11 | * 2 of the License, or (at your option) any later version. |
12 | * |
13 | * ----------------------- |
14 | * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com> |
15 | * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT |
16 | * 19-Dec-2001 Woody Suwalski: Netwinder fixes, ioctl interface |
17 | * 06-Jan-2002 Woody Suwalski: For compatibility, convert all timeouts |
18 | * from minutes to seconds. |
19 | * 07-Jul-2003 Daniele Bellucci: Audit return code of misc_register in |
20 | * nwwatchdog_init. |
21 | * 25-Oct-2005 Woody Suwalski: Convert addresses to #defs, add spinlocks |
22 | * remove limitiation to be used on |
23 | * Netwinders only |
24 | */ |
25 | |
26 | #include <linux/module.h> |
27 | #include <linux/moduleparam.h> |
28 | #include <linux/types.h> |
29 | #include <linux/kernel.h> |
30 | #include <linux/fs.h> |
31 | #include <linux/miscdevice.h> |
32 | #include <linux/init.h> |
33 | #include <linux/ioport.h> |
34 | #include <linux/watchdog.h> |
35 | #include <linux/notifier.h> |
36 | #include <linux/reboot.h> |
37 | #include <linux/io.h> |
38 | #include <linux/uaccess.h> |
39 | |
40 | #include <asm/system.h> |
41 | #include <asm/mach-types.h> |
42 | |
43 | #define WATCHDOG_VERSION "0.04" |
44 | #define WATCHDOG_NAME "Wdt977" |
45 | #define PFX WATCHDOG_NAME ": " |
46 | #define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n" |
47 | |
48 | #define IO_INDEX_PORT 0x370 /* on some systems it can be 0x3F0 */ |
49 | #define IO_DATA_PORT (IO_INDEX_PORT + 1) |
50 | |
51 | #define UNLOCK_DATA 0x87 |
52 | #define LOCK_DATA 0xAA |
53 | #define DEVICE_REGISTER 0x07 |
54 | |
55 | |
56 | #define DEFAULT_TIMEOUT 60 /* default timeout in seconds */ |
57 | |
58 | static int timeout = DEFAULT_TIMEOUT; |
59 | static int timeoutM; /* timeout in minutes */ |
60 | static unsigned long timer_alive; |
61 | static int testmode; |
62 | static char expect_close; |
63 | static DEFINE_SPINLOCK(spinlock); |
64 | |
65 | module_param(timeout, int, 0); |
66 | MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (60..15300), default=" |
67 | __MODULE_STRING(DEFAULT_TIMEOUT) ")"); |
68 | module_param(testmode, int, 0); |
69 | MODULE_PARM_DESC(testmode, "Watchdog testmode (1 = no reboot), default=0"); |
70 | |
71 | static int nowayout = WATCHDOG_NOWAYOUT; |
72 | module_param(nowayout, int, 0); |
73 | MODULE_PARM_DESC(nowayout, |
74 | "Watchdog cannot be stopped once started (default=" |
75 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
76 | |
77 | /* |
78 | * Start the watchdog |
79 | */ |
80 | |
81 | static int wdt977_start(void) |
82 | { |
83 | unsigned long flags; |
84 | |
85 | spin_lock_irqsave(&spinlock, flags); |
86 | |
87 | /* unlock the SuperIO chip */ |
88 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
89 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
90 | |
91 | /* select device Aux2 (device=8) and set watchdog regs F2, F3 and F4 |
92 | * F2 has the timeout in minutes |
93 | * F3 could be set to the POWER LED blink (with GP17 set to PowerLed) |
94 | * at timeout, and to reset timer on kbd/mouse activity (not impl.) |
95 | * F4 is used to just clear the TIMEOUT'ed state (bit 0) |
96 | */ |
97 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
98 | outb_p(0x08, IO_DATA_PORT); |
99 | outb_p(0xF2, IO_INDEX_PORT); |
100 | outb_p(timeoutM, IO_DATA_PORT); |
101 | outb_p(0xF3, IO_INDEX_PORT); |
102 | outb_p(0x00, IO_DATA_PORT); /* another setting is 0E for |
103 | kbd/mouse/LED */ |
104 | outb_p(0xF4, IO_INDEX_PORT); |
105 | outb_p(0x00, IO_DATA_PORT); |
106 | |
107 | /* At last select device Aux1 (dev=7) and set GP16 as a |
108 | * watchdog output. In test mode watch the bit 1 on F4 to |
109 | * indicate "triggered" |
110 | */ |
111 | if (!testmode) { |
112 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
113 | outb_p(0x07, IO_DATA_PORT); |
114 | outb_p(0xE6, IO_INDEX_PORT); |
115 | outb_p(0x08, IO_DATA_PORT); |
116 | } |
117 | |
118 | /* lock the SuperIO chip */ |
119 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
120 | |
121 | spin_unlock_irqrestore(&spinlock, flags); |
122 | printk(KERN_INFO PFX "activated.\n"); |
123 | |
124 | return 0; |
125 | } |
126 | |
127 | /* |
128 | * Stop the watchdog |
129 | */ |
130 | |
131 | static int wdt977_stop(void) |
132 | { |
133 | unsigned long flags; |
134 | spin_lock_irqsave(&spinlock, flags); |
135 | |
136 | /* unlock the SuperIO chip */ |
137 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
138 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
139 | |
140 | /* select device Aux2 (device=8) and set watchdog regs F2,F3 and F4 |
141 | * F3 is reset to its default state |
142 | * F4 can clear the TIMEOUT'ed state (bit 0) - back to default |
143 | * We can not use GP17 as a PowerLed, as we use its usage as a RedLed |
144 | */ |
145 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
146 | outb_p(0x08, IO_DATA_PORT); |
147 | outb_p(0xF2, IO_INDEX_PORT); |
148 | outb_p(0xFF, IO_DATA_PORT); |
149 | outb_p(0xF3, IO_INDEX_PORT); |
150 | outb_p(0x00, IO_DATA_PORT); |
151 | outb_p(0xF4, IO_INDEX_PORT); |
152 | outb_p(0x00, IO_DATA_PORT); |
153 | outb_p(0xF2, IO_INDEX_PORT); |
154 | outb_p(0x00, IO_DATA_PORT); |
155 | |
156 | /* at last select device Aux1 (dev=7) and set |
157 | GP16 as a watchdog output */ |
158 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
159 | outb_p(0x07, IO_DATA_PORT); |
160 | outb_p(0xE6, IO_INDEX_PORT); |
161 | outb_p(0x08, IO_DATA_PORT); |
162 | |
163 | /* lock the SuperIO chip */ |
164 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
165 | |
166 | spin_unlock_irqrestore(&spinlock, flags); |
167 | printk(KERN_INFO PFX "shutdown.\n"); |
168 | |
169 | return 0; |
170 | } |
171 | |
172 | /* |
173 | * Send a keepalive ping to the watchdog |
174 | * This is done by simply re-writing the timeout to reg. 0xF2 |
175 | */ |
176 | |
177 | static int wdt977_keepalive(void) |
178 | { |
179 | unsigned long flags; |
180 | spin_lock_irqsave(&spinlock, flags); |
181 | |
182 | /* unlock the SuperIO chip */ |
183 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
184 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
185 | |
186 | /* select device Aux2 (device=8) and kicks watchdog reg F2 */ |
187 | /* F2 has the timeout in minutes */ |
188 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
189 | outb_p(0x08, IO_DATA_PORT); |
190 | outb_p(0xF2, IO_INDEX_PORT); |
191 | outb_p(timeoutM, IO_DATA_PORT); |
192 | |
193 | /* lock the SuperIO chip */ |
194 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
195 | spin_unlock_irqrestore(&spinlock, flags); |
196 | |
197 | return 0; |
198 | } |
199 | |
200 | /* |
201 | * Set the watchdog timeout value |
202 | */ |
203 | |
204 | static int wdt977_set_timeout(int t) |
205 | { |
206 | int tmrval; |
207 | |
208 | /* convert seconds to minutes, rounding up */ |
209 | tmrval = (t + 59) / 60; |
210 | |
211 | if (machine_is_netwinder()) { |
212 | /* we have a hw bug somewhere, so each 977 minute is actually |
213 | * only 30sec. This limits the max timeout to half of device |
214 | * max of 255 minutes... |
215 | */ |
216 | tmrval += tmrval; |
217 | } |
218 | |
219 | if (tmrval < 1 || tmrval > 255) |
220 | return -EINVAL; |
221 | |
222 | /* timeout is the timeout in seconds, timeoutM is |
223 | the timeout in minutes) */ |
224 | timeout = t; |
225 | timeoutM = tmrval; |
226 | return 0; |
227 | } |
228 | |
229 | /* |
230 | * Get the watchdog status |
231 | */ |
232 | |
233 | static int wdt977_get_status(int *status) |
234 | { |
235 | int new_status; |
236 | unsigned long flags; |
237 | |
238 | spin_lock_irqsave(&spinlock, flags); |
239 | |
240 | /* unlock the SuperIO chip */ |
241 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
242 | outb_p(UNLOCK_DATA, IO_INDEX_PORT); |
243 | |
244 | /* select device Aux2 (device=8) and read watchdog reg F4 */ |
245 | outb_p(DEVICE_REGISTER, IO_INDEX_PORT); |
246 | outb_p(0x08, IO_DATA_PORT); |
247 | outb_p(0xF4, IO_INDEX_PORT); |
248 | new_status = inb_p(IO_DATA_PORT); |
249 | |
250 | /* lock the SuperIO chip */ |
251 | outb_p(LOCK_DATA, IO_INDEX_PORT); |
252 | |
253 | spin_unlock_irqrestore(&spinlock, flags); |
254 | |
255 | *status = 0; |
256 | if (new_status & 1) |
257 | *status |= WDIOF_CARDRESET; |
258 | |
259 | return 0; |
260 | } |
261 | |
262 | |
263 | /* |
264 | * /dev/watchdog handling |
265 | */ |
266 | |
267 | static int wdt977_open(struct inode *inode, struct file *file) |
268 | { |
269 | /* If the watchdog is alive we don't need to start it again */ |
270 | if (test_and_set_bit(0, &timer_alive)) |
271 | return -EBUSY; |
272 | |
273 | if (nowayout) |
274 | __module_get(THIS_MODULE); |
275 | |
276 | wdt977_start(); |
277 | return nonseekable_open(inode, file); |
278 | } |
279 | |
280 | static int wdt977_release(struct inode *inode, struct file *file) |
281 | { |
282 | /* |
283 | * Shut off the timer. |
284 | * Lock it in if it's a module and we set nowayout |
285 | */ |
286 | if (expect_close == 42) { |
287 | wdt977_stop(); |
288 | clear_bit(0, &timer_alive); |
289 | } else { |
290 | wdt977_keepalive(); |
291 | printk(KERN_CRIT PFX |
292 | "Unexpected close, not stopping watchdog!\n"); |
293 | } |
294 | expect_close = 0; |
295 | return 0; |
296 | } |
297 | |
298 | |
299 | /* |
300 | * wdt977_write: |
301 | * @file: file handle to the watchdog |
302 | * @buf: buffer to write (unused as data does not matter here |
303 | * @count: count of bytes |
304 | * @ppos: pointer to the position to write. No seeks allowed |
305 | * |
306 | * A write to a watchdog device is defined as a keepalive signal. Any |
307 | * write of data will do, as we we don't define content meaning. |
308 | */ |
309 | |
310 | static ssize_t wdt977_write(struct file *file, const char __user *buf, |
311 | size_t count, loff_t *ppos) |
312 | { |
313 | if (count) { |
314 | if (!nowayout) { |
315 | size_t i; |
316 | |
317 | /* In case it was set long ago */ |
318 | expect_close = 0; |
319 | |
320 | for (i = 0; i != count; i++) { |
321 | char c; |
322 | if (get_user(c, buf + i)) |
323 | return -EFAULT; |
324 | if (c == 'V') |
325 | expect_close = 42; |
326 | } |
327 | } |
328 | |
329 | /* someone wrote to us, we should restart timer */ |
330 | wdt977_keepalive(); |
331 | } |
332 | return count; |
333 | } |
334 | |
335 | static const struct watchdog_info ident = { |
336 | .options = WDIOF_SETTIMEOUT | |
337 | WDIOF_MAGICCLOSE | |
338 | WDIOF_KEEPALIVEPING, |
339 | .firmware_version = 1, |
340 | .identity = WATCHDOG_NAME, |
341 | }; |
342 | |
343 | /* |
344 | * wdt977_ioctl: |
345 | * @inode: inode of the device |
346 | * @file: file handle to the device |
347 | * @cmd: watchdog command |
348 | * @arg: argument pointer |
349 | * |
350 | * The watchdog API defines a common set of functions for all watchdogs |
351 | * according to their available features. |
352 | */ |
353 | |
354 | static long wdt977_ioctl(struct file *file, unsigned int cmd, |
355 | unsigned long arg) |
356 | { |
357 | int status; |
358 | int new_options, retval = -EINVAL; |
359 | int new_timeout; |
360 | union { |
361 | struct watchdog_info __user *ident; |
362 | int __user *i; |
363 | } uarg; |
364 | |
365 | uarg.i = (int __user *)arg; |
366 | |
367 | switch (cmd) { |
368 | case WDIOC_GETSUPPORT: |
369 | return copy_to_user(uarg.ident, &ident, |
370 | sizeof(ident)) ? -EFAULT : 0; |
371 | |
372 | case WDIOC_GETSTATUS: |
373 | wdt977_get_status(&status); |
374 | return put_user(status, uarg.i); |
375 | |
376 | case WDIOC_GETBOOTSTATUS: |
377 | return put_user(0, uarg.i); |
378 | |
379 | case WDIOC_SETOPTIONS: |
380 | if (get_user(new_options, uarg.i)) |
381 | return -EFAULT; |
382 | |
383 | if (new_options & WDIOS_DISABLECARD) { |
384 | wdt977_stop(); |
385 | retval = 0; |
386 | } |
387 | |
388 | if (new_options & WDIOS_ENABLECARD) { |
389 | wdt977_start(); |
390 | retval = 0; |
391 | } |
392 | |
393 | return retval; |
394 | |
395 | case WDIOC_KEEPALIVE: |
396 | wdt977_keepalive(); |
397 | return 0; |
398 | |
399 | case WDIOC_SETTIMEOUT: |
400 | if (get_user(new_timeout, uarg.i)) |
401 | return -EFAULT; |
402 | |
403 | if (wdt977_set_timeout(new_timeout)) |
404 | return -EINVAL; |
405 | |
406 | wdt977_keepalive(); |
407 | /* Fall */ |
408 | |
409 | case WDIOC_GETTIMEOUT: |
410 | return put_user(timeout, uarg.i); |
411 | |
412 | default: |
413 | return -ENOTTY; |
414 | |
415 | } |
416 | } |
417 | |
418 | static int wdt977_notify_sys(struct notifier_block *this, unsigned long code, |
419 | void *unused) |
420 | { |
421 | if (code == SYS_DOWN || code == SYS_HALT) |
422 | wdt977_stop(); |
423 | return NOTIFY_DONE; |
424 | } |
425 | |
426 | static const struct file_operations wdt977_fops = { |
427 | .owner = THIS_MODULE, |
428 | .llseek = no_llseek, |
429 | .write = wdt977_write, |
430 | .unlocked_ioctl = wdt977_ioctl, |
431 | .open = wdt977_open, |
432 | .release = wdt977_release, |
433 | }; |
434 | |
435 | static struct miscdevice wdt977_miscdev = { |
436 | .minor = WATCHDOG_MINOR, |
437 | .name = "watchdog", |
438 | .fops = &wdt977_fops, |
439 | }; |
440 | |
441 | static struct notifier_block wdt977_notifier = { |
442 | .notifier_call = wdt977_notify_sys, |
443 | }; |
444 | |
445 | static int __init wd977_init(void) |
446 | { |
447 | int rc; |
448 | |
449 | printk(KERN_INFO PFX DRIVER_VERSION); |
450 | |
451 | /* Check that the timeout value is within its range; |
452 | if not reset to the default */ |
453 | if (wdt977_set_timeout(timeout)) { |
454 | wdt977_set_timeout(DEFAULT_TIMEOUT); |
455 | printk(KERN_INFO PFX |
456 | "timeout value must be 60 < timeout < 15300, using %d\n", |
457 | DEFAULT_TIMEOUT); |
458 | } |
459 | |
460 | /* on Netwinder the IOports are already reserved by |
461 | * arch/arm/mach-footbridge/netwinder-hw.c |
462 | */ |
463 | if (!machine_is_netwinder()) { |
464 | if (!request_region(IO_INDEX_PORT, 2, WATCHDOG_NAME)) { |
465 | printk(KERN_ERR PFX |
466 | "I/O address 0x%04x already in use\n", |
467 | IO_INDEX_PORT); |
468 | rc = -EIO; |
469 | goto err_out; |
470 | } |
471 | } |
472 | |
473 | rc = register_reboot_notifier(&wdt977_notifier); |
474 | if (rc) { |
475 | printk(KERN_ERR PFX |
476 | "cannot register reboot notifier (err=%d)\n", rc); |
477 | goto err_out_region; |
478 | } |
479 | |
480 | rc = misc_register(&wdt977_miscdev); |
481 | if (rc) { |
482 | printk(KERN_ERR PFX |
483 | "cannot register miscdev on minor=%d (err=%d)\n", |
484 | wdt977_miscdev.minor, rc); |
485 | goto err_out_reboot; |
486 | } |
487 | |
488 | printk(KERN_INFO PFX |
489 | "initialized. timeout=%d sec (nowayout=%d, testmode=%i)\n", |
490 | timeout, nowayout, testmode); |
491 | |
492 | return 0; |
493 | |
494 | err_out_reboot: |
495 | unregister_reboot_notifier(&wdt977_notifier); |
496 | err_out_region: |
497 | if (!machine_is_netwinder()) |
498 | release_region(IO_INDEX_PORT, 2); |
499 | err_out: |
500 | return rc; |
501 | } |
502 | |
503 | static void __exit wd977_exit(void) |
504 | { |
505 | wdt977_stop(); |
506 | misc_deregister(&wdt977_miscdev); |
507 | unregister_reboot_notifier(&wdt977_notifier); |
508 | release_region(IO_INDEX_PORT, 2); |
509 | } |
510 | |
511 | module_init(wd977_init); |
512 | module_exit(wd977_exit); |
513 | |
514 | MODULE_AUTHOR("Woody Suwalski <woodys@xandros.com>"); |
515 | MODULE_DESCRIPTION("W83977AF Watchdog driver"); |
516 | MODULE_LICENSE("GPL"); |
517 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
518 |
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