Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * PC Watchdog Driver | |
3 | * by Ken Hollis (khollis@bitgate.com) | |
4 | * | |
5 | * Permission granted from Simon Machell (73244.1270@compuserve.com) | |
6 | * Written for the Linux Kernel, and GPLed by Ken Hollis | |
7 | * | |
8 | * 960107 Added request_region routines, modulized the whole thing. | |
9 | * 960108 Fixed end-of-file pointer (Thanks to Dan Hollis), added | |
10 | * WD_TIMEOUT define. | |
11 | * 960216 Added eof marker on the file, and changed verbose messages. | |
12 | * 960716 Made functional and cosmetic changes to the source for | |
13 | * inclusion in Linux 2.0.x kernels, thanks to Alan Cox. | |
14 | * 960717 Removed read/seek routines, replaced with ioctl. Also, added | |
15 | * check_region command due to Alan's suggestion. | |
16 | * 960821 Made changes to compile in newer 2.0.x kernels. Added | |
17 | * "cold reboot sense" entry. | |
18 | * 960825 Made a few changes to code, deleted some defines and made | |
19 | * typedefs to replace them. Made heartbeat reset only available | |
20 | * via ioctl, and removed the write routine. | |
21 | * 960828 Added new items for PC Watchdog Rev.C card. | |
22 | * 960829 Changed around all of the IOCTLs, added new features, | |
23 | * added watchdog disable/re-enable routines. Added firmware | |
24 | * version reporting. Added read routine for temperature. | |
25 | * Removed some extra defines, added an autodetect Revision | |
26 | * routine. | |
27 | * 961006 Revised some documentation, fixed some cosmetic bugs. Made | |
28 | * drivers to panic the system if it's overheating at bootup. | |
29 | * 961118 Changed some verbiage on some of the output, tidied up | |
30 | * code bits, and added compatibility to 2.1.x. | |
31 | * 970912 Enabled board on open and disable on close. | |
32 | * 971107 Took account of recent VFS changes (broke read). | |
33 | * 971210 Disable board on initialisation in case board already ticking. | |
34 | * 971222 Changed open/close for temperature handling | |
35 | * Michael Meskes <meskes@debian.org>. | |
36 | * 980112 Used minor numbers from include/linux/miscdevice.h | |
37 | * 990403 Clear reset status after reading control status register in | |
38 | * pcwd_showprevstate(). [Marc Boucher <marc@mbsi.ca>] | |
39 | * 990605 Made changes to code to support Firmware 1.22a, added | |
40 | * fairly useless proc entry. | |
41 | * 990610 removed said useless proc code for the merge <alan> | |
42 | * 000403 Removed last traces of proc code. <davej> | |
43 | * 011214 Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com> | |
44 | * Added timeout module option to override default | |
45 | */ | |
46 | ||
47 | /* | |
48 | * A bells and whistles driver is available from http://www.pcwd.de/ | |
49 | * More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/ | |
50 | */ | |
51 | ||
fd41fa61 WVS |
52 | #include <linux/config.h> /* For CONFIG_WATCHDOG_NOWAYOUT/... */ |
53 | #include <linux/module.h> /* For module specific items */ | |
54 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
55 | #include <linux/types.h> /* For standard types (like size_t) */ | |
56 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
57 | #include <linux/kernel.h> /* For printk/panic/... */ | |
58 | #include <linux/delay.h> /* For mdelay function */ | |
59 | #include <linux/timer.h> /* For timer related operations */ | |
60 | #include <linux/jiffies.h> /* For jiffies stuff */ | |
61 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ | |
62 | #include <linux/watchdog.h> /* For the watchdog specific items */ | |
63 | #include <linux/notifier.h> /* For notifier support */ | |
64 | #include <linux/reboot.h> /* For reboot_notifier stuff */ | |
65 | #include <linux/init.h> /* For __init/__exit/... */ | |
66 | #include <linux/fs.h> /* For file operations */ | |
67 | #include <linux/ioport.h> /* For io-port access */ | |
68 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ | |
4e57b681 | 69 | #include <linux/sched.h> /* TASK_INTERRUPTIBLE, set_current_state() and friends */ |
fd41fa61 | 70 | #include <linux/slab.h> /* For kmalloc */ |
1da177e4 | 71 | |
fd41fa61 WVS |
72 | #include <asm/uaccess.h> /* For copy_to_user/put_user/... */ |
73 | #include <asm/io.h> /* For inb/outb/... */ | |
74 | ||
75 | /* Module and version information */ | |
1da177e4 LT |
76 | #define WD_VER "1.16 (06/12/2004)" |
77 | #define PFX "pcwd: " | |
78 | ||
79 | /* | |
80 | * It should be noted that PCWD_REVISION_B was removed because A and B | |
81 | * are essentially the same types of card, with the exception that B | |
82 | * has temperature reporting. Since I didn't receive a Rev.B card, | |
83 | * the Rev.B card is not supported. (It's a good thing too, as they | |
84 | * are no longer in production.) | |
85 | */ | |
86 | #define PCWD_REVISION_A 1 | |
87 | #define PCWD_REVISION_C 2 | |
88 | ||
89 | /* | |
fd41fa61 | 90 | * These are the defines that describe the control status #1 bits for the |
1da177e4 LT |
91 | * PC Watchdog card, revision A. |
92 | */ | |
93 | #define WD_WDRST 0x01 /* Previously reset state */ | |
94 | #define WD_T110 0x02 /* Temperature overheat sense */ | |
95 | #define WD_HRTBT 0x04 /* Heartbeat sense */ | |
96 | #define WD_RLY2 0x08 /* External relay triggered */ | |
97 | #define WD_SRLY2 0x80 /* Software external relay triggered */ | |
98 | ||
99 | /* | |
fd41fa61 | 100 | * These are the defines that describe the control status #1 bits for the |
1da177e4 LT |
101 | * PC Watchdog card, revision C. |
102 | */ | |
103 | #define WD_REVC_WTRP 0x01 /* Watchdog Trip status */ | |
104 | #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */ | |
105 | #define WD_REVC_TTRP 0x04 /* Temperature Trip status */ | |
106 | ||
107 | /* max. time we give an ISA watchdog card to process a command */ | |
108 | /* 500ms for each 4 bit response (according to spec.) */ | |
109 | #define ISA_COMMAND_TIMEOUT 1000 | |
110 | ||
111 | /* Watchdog's internal commands */ | |
fd41fa61 WVS |
112 | #define CMD_ISA_IDLE 0x00 |
113 | #define CMD_ISA_VERSION_INTEGER 0x01 | |
114 | #define CMD_ISA_VERSION_TENTH 0x02 | |
115 | #define CMD_ISA_VERSION_HUNDRETH 0x03 | |
116 | #define CMD_ISA_VERSION_MINOR 0x04 | |
117 | #define CMD_ISA_SWITCH_SETTINGS 0x05 | |
118 | #define CMD_ISA_DELAY_TIME_2SECS 0x0A | |
119 | #define CMD_ISA_DELAY_TIME_4SECS 0x0B | |
120 | #define CMD_ISA_DELAY_TIME_8SECS 0x0C | |
1da177e4 LT |
121 | |
122 | /* | |
123 | * We are using an kernel timer to do the pinging of the watchdog | |
124 | * every ~500ms. We try to set the internal heartbeat of the | |
125 | * watchdog to 2 ms. | |
126 | */ | |
127 | ||
128 | #define WDT_INTERVAL (HZ/2+1) | |
129 | ||
130 | /* We can only use 1 card due to the /dev/watchdog restriction */ | |
131 | static int cards_found; | |
132 | ||
133 | /* internal variables */ | |
134 | static atomic_t open_allowed = ATOMIC_INIT(1); | |
135 | static char expect_close; | |
136 | static struct timer_list timer; | |
137 | static unsigned long next_heartbeat; | |
138 | static int temp_panic; | |
139 | static int revision; /* The card's revision */ | |
140 | static int supports_temp; /* Wether or not the card has a temperature device */ | |
141 | static int command_mode; /* Wether or not the card is in command mode */ | |
142 | static int initial_status; /* The card's boot status */ | |
143 | static int current_readport; /* The cards I/O address */ | |
144 | static spinlock_t io_lock; | |
145 | ||
146 | /* module parameters */ | |
147 | #define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat */ | |
148 | static int heartbeat = WATCHDOG_HEARTBEAT; | |
149 | module_param(heartbeat, int, 0); | |
150 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); | |
151 | ||
4bfdf378 | 152 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 LT |
153 | module_param(nowayout, int, 0); |
154 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
155 | ||
156 | /* | |
157 | * Internal functions | |
158 | */ | |
159 | ||
160 | static int send_isa_command(int cmd) | |
161 | { | |
162 | int i; | |
163 | int control_status; | |
164 | int port0, last_port0; /* Double read for stabilising */ | |
165 | ||
166 | /* The WCMD bit must be 1 and the command is only 4 bits in size */ | |
167 | control_status = (cmd & 0x0F) | 0x80; | |
168 | outb_p(control_status, current_readport + 2); | |
169 | udelay(ISA_COMMAND_TIMEOUT); | |
170 | ||
171 | port0 = inb_p(current_readport); | |
172 | for (i = 0; i < 25; ++i) { | |
173 | last_port0 = port0; | |
174 | port0 = inb_p(current_readport); | |
175 | ||
176 | if (port0 == last_port0) | |
177 | break; /* Data is stable */ | |
178 | ||
179 | udelay (250); | |
180 | } | |
181 | ||
182 | return port0; | |
183 | } | |
184 | ||
185 | static int set_command_mode(void) | |
186 | { | |
187 | int i, found=0, count=0; | |
188 | ||
189 | /* Set the card into command mode */ | |
190 | spin_lock(&io_lock); | |
191 | while ((!found) && (count < 3)) { | |
192 | i = send_isa_command(CMD_ISA_IDLE); | |
193 | ||
194 | if (i == 0x00) | |
195 | found = 1; | |
196 | else if (i == 0xF3) { | |
197 | /* Card does not like what we've done to it */ | |
198 | outb_p(0x00, current_readport + 2); | |
199 | udelay(1200); /* Spec says wait 1ms */ | |
200 | outb_p(0x00, current_readport + 2); | |
201 | udelay(ISA_COMMAND_TIMEOUT); | |
202 | } | |
203 | count++; | |
204 | } | |
205 | spin_unlock(&io_lock); | |
206 | command_mode = found; | |
207 | ||
208 | return(found); | |
209 | } | |
210 | ||
211 | static void unset_command_mode(void) | |
212 | { | |
213 | /* Set the card into normal mode */ | |
214 | spin_lock(&io_lock); | |
215 | outb_p(0x00, current_readport + 2); | |
216 | udelay(ISA_COMMAND_TIMEOUT); | |
217 | spin_unlock(&io_lock); | |
218 | ||
219 | command_mode = 0; | |
220 | } | |
221 | ||
222 | static void pcwd_timer_ping(unsigned long data) | |
223 | { | |
224 | int wdrst_stat; | |
225 | ||
226 | /* If we got a heartbeat pulse within the WDT_INTERVAL | |
227 | * we agree to ping the WDT */ | |
228 | if(time_before(jiffies, next_heartbeat)) { | |
229 | /* Ping the watchdog */ | |
230 | spin_lock(&io_lock); | |
231 | if (revision == PCWD_REVISION_A) { | |
232 | /* Rev A cards are reset by setting the WD_WDRST bit in register 1 */ | |
233 | wdrst_stat = inb_p(current_readport); | |
234 | wdrst_stat &= 0x0F; | |
235 | wdrst_stat |= WD_WDRST; | |
236 | ||
237 | outb_p(wdrst_stat, current_readport + 1); | |
238 | } else { | |
239 | /* Re-trigger watchdog by writing to port 0 */ | |
240 | outb_p(0x00, current_readport); | |
241 | } | |
242 | ||
243 | /* Re-set the timer interval */ | |
244 | mod_timer(&timer, jiffies + WDT_INTERVAL); | |
245 | ||
246 | spin_unlock(&io_lock); | |
247 | } else { | |
248 | printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n"); | |
249 | } | |
250 | } | |
251 | ||
252 | static int pcwd_start(void) | |
253 | { | |
254 | int stat_reg; | |
255 | ||
256 | next_heartbeat = jiffies + (heartbeat * HZ); | |
257 | ||
258 | /* Start the timer */ | |
259 | mod_timer(&timer, jiffies + WDT_INTERVAL); | |
260 | ||
261 | /* Enable the port */ | |
262 | if (revision == PCWD_REVISION_C) { | |
263 | spin_lock(&io_lock); | |
264 | outb_p(0x00, current_readport + 3); | |
265 | udelay(ISA_COMMAND_TIMEOUT); | |
266 | stat_reg = inb_p(current_readport + 2); | |
267 | spin_unlock(&io_lock); | |
268 | if (stat_reg & 0x10) { | |
269 | printk(KERN_INFO PFX "Could not start watchdog\n"); | |
270 | return -EIO; | |
271 | } | |
272 | } | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static int pcwd_stop(void) | |
277 | { | |
278 | int stat_reg; | |
279 | ||
280 | /* Stop the timer */ | |
281 | del_timer(&timer); | |
282 | ||
283 | /* Disable the board */ | |
284 | if (revision == PCWD_REVISION_C) { | |
285 | spin_lock(&io_lock); | |
286 | outb_p(0xA5, current_readport + 3); | |
287 | udelay(ISA_COMMAND_TIMEOUT); | |
288 | outb_p(0xA5, current_readport + 3); | |
289 | udelay(ISA_COMMAND_TIMEOUT); | |
290 | stat_reg = inb_p(current_readport + 2); | |
291 | spin_unlock(&io_lock); | |
292 | if ((stat_reg & 0x10) == 0) { | |
293 | printk(KERN_INFO PFX "Could not stop watchdog\n"); | |
294 | return -EIO; | |
295 | } | |
296 | } | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static int pcwd_keepalive(void) | |
301 | { | |
302 | /* user land ping */ | |
303 | next_heartbeat = jiffies + (heartbeat * HZ); | |
304 | return 0; | |
305 | } | |
306 | ||
307 | static int pcwd_set_heartbeat(int t) | |
308 | { | |
309 | if ((t < 2) || (t > 7200)) /* arbitrary upper limit */ | |
310 | return -EINVAL; | |
311 | ||
312 | heartbeat = t; | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static int pcwd_get_status(int *status) | |
317 | { | |
318 | int card_status; | |
319 | ||
320 | *status=0; | |
321 | spin_lock(&io_lock); | |
322 | if (revision == PCWD_REVISION_A) | |
323 | /* Rev A cards return status information from | |
324 | * the base register, which is used for the | |
325 | * temperature in other cards. */ | |
326 | card_status = inb(current_readport); | |
327 | else { | |
328 | /* Rev C cards return card status in the base | |
329 | * address + 1 register. And use different bits | |
330 | * to indicate a card initiated reset, and an | |
331 | * over-temperature condition. And the reboot | |
332 | * status can be reset. */ | |
333 | card_status = inb(current_readport + 1); | |
334 | } | |
335 | spin_unlock(&io_lock); | |
336 | ||
337 | if (revision == PCWD_REVISION_A) { | |
338 | if (card_status & WD_WDRST) | |
339 | *status |= WDIOF_CARDRESET; | |
340 | ||
341 | if (card_status & WD_T110) { | |
342 | *status |= WDIOF_OVERHEAT; | |
343 | if (temp_panic) { | |
344 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
68acc05d | 345 | kernel_power_off(); |
1da177e4 LT |
346 | } |
347 | } | |
348 | } else { | |
349 | if (card_status & WD_REVC_WTRP) | |
350 | *status |= WDIOF_CARDRESET; | |
351 | ||
352 | if (card_status & WD_REVC_TTRP) { | |
353 | *status |= WDIOF_OVERHEAT; | |
354 | if (temp_panic) { | |
355 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
68acc05d | 356 | kernel_power_off(); |
1da177e4 LT |
357 | } |
358 | } | |
359 | } | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static int pcwd_clear_status(void) | |
365 | { | |
366 | if (revision == PCWD_REVISION_C) { | |
367 | spin_lock(&io_lock); | |
368 | outb_p(0x00, current_readport + 1); /* clear reset status */ | |
369 | spin_unlock(&io_lock); | |
370 | } | |
371 | return 0; | |
372 | } | |
373 | ||
374 | static int pcwd_get_temperature(int *temperature) | |
375 | { | |
376 | /* check that port 0 gives temperature info and no command results */ | |
377 | if (command_mode) | |
378 | return -1; | |
379 | ||
380 | *temperature = 0; | |
381 | if (!supports_temp) | |
382 | return -ENODEV; | |
383 | ||
384 | /* | |
385 | * Convert celsius to fahrenheit, since this was | |
386 | * the decided 'standard' for this return value. | |
387 | */ | |
388 | spin_lock(&io_lock); | |
389 | *temperature = ((inb(current_readport)) * 9 / 5) + 32; | |
390 | spin_unlock(&io_lock); | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
395 | /* | |
396 | * /dev/watchdog handling | |
397 | */ | |
398 | ||
399 | static int pcwd_ioctl(struct inode *inode, struct file *file, | |
400 | unsigned int cmd, unsigned long arg) | |
401 | { | |
402 | int rv; | |
403 | int status; | |
404 | int temperature; | |
405 | int new_heartbeat; | |
406 | int __user *argp = (int __user *)arg; | |
407 | static struct watchdog_info ident = { | |
408 | .options = WDIOF_OVERHEAT | | |
409 | WDIOF_CARDRESET | | |
410 | WDIOF_KEEPALIVEPING | | |
411 | WDIOF_SETTIMEOUT | | |
412 | WDIOF_MAGICCLOSE, | |
413 | .firmware_version = 1, | |
414 | .identity = "PCWD", | |
415 | }; | |
416 | ||
417 | switch(cmd) { | |
418 | default: | |
419 | return -ENOIOCTLCMD; | |
420 | ||
421 | case WDIOC_GETSUPPORT: | |
422 | if(copy_to_user(argp, &ident, sizeof(ident))) | |
423 | return -EFAULT; | |
424 | return 0; | |
425 | ||
426 | case WDIOC_GETSTATUS: | |
427 | pcwd_get_status(&status); | |
428 | return put_user(status, argp); | |
429 | ||
430 | case WDIOC_GETBOOTSTATUS: | |
431 | return put_user(initial_status, argp); | |
432 | ||
433 | case WDIOC_GETTEMP: | |
434 | if (pcwd_get_temperature(&temperature)) | |
435 | return -EFAULT; | |
436 | ||
437 | return put_user(temperature, argp); | |
438 | ||
439 | case WDIOC_SETOPTIONS: | |
440 | if (revision == PCWD_REVISION_C) | |
441 | { | |
442 | if(copy_from_user(&rv, argp, sizeof(int))) | |
443 | return -EFAULT; | |
444 | ||
445 | if (rv & WDIOS_DISABLECARD) | |
446 | { | |
447 | return pcwd_stop(); | |
448 | } | |
449 | ||
450 | if (rv & WDIOS_ENABLECARD) | |
451 | { | |
452 | return pcwd_start(); | |
453 | } | |
454 | ||
455 | if (rv & WDIOS_TEMPPANIC) | |
456 | { | |
457 | temp_panic = 1; | |
458 | } | |
459 | } | |
460 | return -EINVAL; | |
461 | ||
462 | case WDIOC_KEEPALIVE: | |
463 | pcwd_keepalive(); | |
464 | return 0; | |
465 | ||
466 | case WDIOC_SETTIMEOUT: | |
467 | if (get_user(new_heartbeat, argp)) | |
468 | return -EFAULT; | |
469 | ||
470 | if (pcwd_set_heartbeat(new_heartbeat)) | |
471 | return -EINVAL; | |
472 | ||
473 | pcwd_keepalive(); | |
474 | /* Fall */ | |
475 | ||
476 | case WDIOC_GETTIMEOUT: | |
477 | return put_user(heartbeat, argp); | |
478 | } | |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
483 | static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, | |
484 | loff_t *ppos) | |
485 | { | |
486 | if (len) { | |
487 | if (!nowayout) { | |
488 | size_t i; | |
489 | ||
490 | /* In case it was set long ago */ | |
491 | expect_close = 0; | |
492 | ||
493 | for (i = 0; i != len; i++) { | |
494 | char c; | |
495 | ||
496 | if (get_user(c, buf + i)) | |
497 | return -EFAULT; | |
498 | if (c == 'V') | |
499 | expect_close = 42; | |
500 | } | |
501 | } | |
502 | pcwd_keepalive(); | |
503 | } | |
504 | return len; | |
505 | } | |
506 | ||
507 | static int pcwd_open(struct inode *inode, struct file *file) | |
508 | { | |
509 | if (!atomic_dec_and_test(&open_allowed) ) { | |
510 | atomic_inc( &open_allowed ); | |
511 | return -EBUSY; | |
512 | } | |
513 | ||
514 | if (nowayout) | |
515 | __module_get(THIS_MODULE); | |
516 | ||
517 | /* Activate */ | |
518 | pcwd_start(); | |
519 | pcwd_keepalive(); | |
520 | return nonseekable_open(inode, file); | |
521 | } | |
522 | ||
523 | static int pcwd_close(struct inode *inode, struct file *file) | |
524 | { | |
525 | if (expect_close == 42) { | |
526 | pcwd_stop(); | |
527 | } else { | |
528 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); | |
529 | pcwd_keepalive(); | |
530 | } | |
531 | expect_close = 0; | |
532 | atomic_inc( &open_allowed ); | |
533 | return 0; | |
534 | } | |
535 | ||
536 | /* | |
537 | * /dev/temperature handling | |
538 | */ | |
539 | ||
540 | static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, | |
541 | loff_t *ppos) | |
542 | { | |
543 | int temperature; | |
544 | ||
545 | if (pcwd_get_temperature(&temperature)) | |
546 | return -EFAULT; | |
547 | ||
548 | if (copy_to_user(buf, &temperature, 1)) | |
549 | return -EFAULT; | |
550 | ||
551 | return 1; | |
552 | } | |
553 | ||
554 | static int pcwd_temp_open(struct inode *inode, struct file *file) | |
555 | { | |
556 | if (!supports_temp) | |
557 | return -ENODEV; | |
558 | ||
559 | return nonseekable_open(inode, file); | |
560 | } | |
561 | ||
562 | static int pcwd_temp_close(struct inode *inode, struct file *file) | |
563 | { | |
564 | return 0; | |
565 | } | |
566 | ||
567 | /* | |
568 | * Notify system | |
569 | */ | |
570 | ||
571 | static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
572 | { | |
573 | if (code==SYS_DOWN || code==SYS_HALT) { | |
574 | /* Turn the WDT off */ | |
575 | pcwd_stop(); | |
576 | } | |
577 | ||
578 | return NOTIFY_DONE; | |
579 | } | |
580 | ||
581 | /* | |
582 | * Kernel Interfaces | |
583 | */ | |
584 | ||
585 | static struct file_operations pcwd_fops = { | |
586 | .owner = THIS_MODULE, | |
587 | .llseek = no_llseek, | |
588 | .write = pcwd_write, | |
589 | .ioctl = pcwd_ioctl, | |
590 | .open = pcwd_open, | |
591 | .release = pcwd_close, | |
592 | }; | |
593 | ||
594 | static struct miscdevice pcwd_miscdev = { | |
595 | .minor = WATCHDOG_MINOR, | |
596 | .name = "watchdog", | |
597 | .fops = &pcwd_fops, | |
598 | }; | |
599 | ||
600 | static struct file_operations pcwd_temp_fops = { | |
601 | .owner = THIS_MODULE, | |
602 | .llseek = no_llseek, | |
603 | .read = pcwd_temp_read, | |
604 | .open = pcwd_temp_open, | |
605 | .release = pcwd_temp_close, | |
606 | }; | |
607 | ||
608 | static struct miscdevice temp_miscdev = { | |
609 | .minor = TEMP_MINOR, | |
610 | .name = "temperature", | |
611 | .fops = &pcwd_temp_fops, | |
612 | }; | |
613 | ||
614 | static struct notifier_block pcwd_notifier = { | |
615 | .notifier_call = pcwd_notify_sys, | |
616 | }; | |
617 | ||
618 | /* | |
619 | * Init & exit routines | |
620 | */ | |
621 | ||
622 | static inline void get_support(void) | |
623 | { | |
624 | if (inb(current_readport) != 0xF0) | |
625 | supports_temp = 1; | |
626 | } | |
627 | ||
628 | static inline int get_revision(void) | |
629 | { | |
630 | int r = PCWD_REVISION_C; | |
631 | ||
632 | spin_lock(&io_lock); | |
633 | /* REV A cards use only 2 io ports; test | |
634 | * presumes a floating bus reads as 0xff. */ | |
635 | if ((inb(current_readport + 2) == 0xFF) || | |
636 | (inb(current_readport + 3) == 0xFF)) | |
637 | r=PCWD_REVISION_A; | |
638 | spin_unlock(&io_lock); | |
639 | ||
640 | return r; | |
641 | } | |
642 | ||
643 | static inline char *get_firmware(void) | |
644 | { | |
645 | int one, ten, hund, minor; | |
646 | char *ret; | |
647 | ||
648 | ret = kmalloc(6, GFP_KERNEL); | |
649 | if(ret == NULL) | |
650 | return NULL; | |
651 | ||
652 | if (set_command_mode()) { | |
653 | one = send_isa_command(CMD_ISA_VERSION_INTEGER); | |
654 | ten = send_isa_command(CMD_ISA_VERSION_TENTH); | |
655 | hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH); | |
656 | minor = send_isa_command(CMD_ISA_VERSION_MINOR); | |
657 | sprintf(ret, "%c.%c%c%c", one, ten, hund, minor); | |
658 | } | |
659 | else | |
660 | sprintf(ret, "ERROR"); | |
661 | ||
662 | unset_command_mode(); | |
663 | return(ret); | |
664 | } | |
665 | ||
666 | static inline int get_option_switches(void) | |
667 | { | |
668 | int rv=0; | |
669 | ||
670 | if (set_command_mode()) { | |
671 | /* Get switch settings */ | |
672 | rv = send_isa_command(CMD_ISA_SWITCH_SETTINGS); | |
673 | } | |
674 | ||
675 | unset_command_mode(); | |
676 | return(rv); | |
677 | } | |
678 | ||
679 | static int __devinit pcwatchdog_init(int base_addr) | |
680 | { | |
681 | int ret; | |
682 | char *firmware; | |
683 | int option_switches; | |
684 | ||
685 | cards_found++; | |
686 | if (cards_found == 1) | |
687 | printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER); | |
688 | ||
689 | if (cards_found > 1) { | |
690 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); | |
691 | return -ENODEV; | |
692 | } | |
693 | ||
694 | if (base_addr == 0x0000) { | |
695 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); | |
696 | return -ENODEV; | |
697 | } | |
698 | current_readport = base_addr; | |
699 | ||
700 | /* Check card's revision */ | |
701 | revision = get_revision(); | |
702 | ||
703 | if (!request_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { | |
704 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", | |
705 | current_readport); | |
706 | current_readport = 0x0000; | |
707 | return -EIO; | |
708 | } | |
709 | ||
710 | /* Initial variables */ | |
711 | supports_temp = 0; | |
712 | temp_panic = 0; | |
713 | initial_status = 0x0000; | |
714 | ||
715 | /* get the boot_status */ | |
716 | pcwd_get_status(&initial_status); | |
717 | ||
718 | /* clear the "card caused reboot" flag */ | |
719 | pcwd_clear_status(); | |
720 | ||
721 | init_timer(&timer); | |
722 | timer.function = pcwd_timer_ping; | |
723 | timer.data = 0; | |
724 | ||
725 | /* Disable the board */ | |
726 | pcwd_stop(); | |
727 | ||
728 | /* Check whether or not the card supports the temperature device */ | |
729 | get_support(); | |
730 | ||
731 | /* Get some extra info from the hardware (in command/debug/diag mode) */ | |
732 | if (revision == PCWD_REVISION_A) | |
733 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", current_readport); | |
734 | else if (revision == PCWD_REVISION_C) { | |
735 | firmware = get_firmware(); | |
736 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n", | |
737 | current_readport, firmware); | |
738 | kfree(firmware); | |
739 | option_switches = get_option_switches(); | |
740 | printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", | |
741 | option_switches, | |
742 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
743 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
744 | ||
745 | /* Reprogram internal heartbeat to 2 seconds */ | |
746 | if (set_command_mode()) { | |
747 | send_isa_command(CMD_ISA_DELAY_TIME_2SECS); | |
748 | unset_command_mode(); | |
749 | } | |
750 | } else { | |
751 | /* Should NEVER happen, unless get_revision() fails. */ | |
752 | printk(KERN_INFO PFX "Unable to get revision\n"); | |
753 | release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4); | |
754 | current_readport = 0x0000; | |
755 | return -1; | |
756 | } | |
757 | ||
758 | if (supports_temp) | |
759 | printk(KERN_INFO PFX "Temperature Option Detected\n"); | |
760 | ||
761 | if (initial_status & WDIOF_CARDRESET) | |
762 | printk(KERN_INFO PFX "Previous reboot was caused by the card\n"); | |
763 | ||
764 | if (initial_status & WDIOF_OVERHEAT) { | |
765 | printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n"); | |
766 | printk(KERN_EMERG PFX "CPU Overheat\n"); | |
767 | } | |
768 | ||
769 | if (initial_status == 0) | |
770 | printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n"); | |
771 | ||
772 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
fd41fa61 WVS |
773 | if (pcwd_set_heartbeat(heartbeat)) { |
774 | pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); | |
775 | printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n", | |
776 | WATCHDOG_HEARTBEAT); | |
1da177e4 LT |
777 | } |
778 | ||
779 | ret = register_reboot_notifier(&pcwd_notifier); | |
780 | if (ret) { | |
781 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", | |
782 | ret); | |
783 | release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4); | |
784 | current_readport = 0x0000; | |
785 | return ret; | |
786 | } | |
787 | ||
788 | if (supports_temp) { | |
789 | ret = misc_register(&temp_miscdev); | |
790 | if (ret) { | |
791 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
792 | TEMP_MINOR, ret); | |
793 | unregister_reboot_notifier(&pcwd_notifier); | |
794 | release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4); | |
795 | current_readport = 0x0000; | |
796 | return ret; | |
797 | } | |
798 | } | |
799 | ||
800 | ret = misc_register(&pcwd_miscdev); | |
801 | if (ret) { | |
802 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
803 | WATCHDOG_MINOR, ret); | |
804 | if (supports_temp) | |
805 | misc_deregister(&temp_miscdev); | |
806 | unregister_reboot_notifier(&pcwd_notifier); | |
807 | release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4); | |
808 | current_readport = 0x0000; | |
809 | return ret; | |
810 | } | |
811 | ||
812 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
813 | heartbeat, nowayout); | |
814 | ||
815 | return 0; | |
816 | } | |
817 | ||
818 | static void __devexit pcwatchdog_exit(void) | |
819 | { | |
820 | /* Disable the board */ | |
821 | if (!nowayout) | |
822 | pcwd_stop(); | |
823 | ||
824 | /* Deregister */ | |
825 | misc_deregister(&pcwd_miscdev); | |
826 | if (supports_temp) | |
827 | misc_deregister(&temp_miscdev); | |
828 | unregister_reboot_notifier(&pcwd_notifier); | |
829 | release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4); | |
830 | current_readport = 0x0000; | |
f1c3a056 | 831 | cards_found--; |
1da177e4 LT |
832 | } |
833 | ||
834 | /* | |
835 | * The ISA cards have a heartbeat bit in one of the registers, which | |
836 | * register is card dependent. The heartbeat bit is monitored, and if | |
837 | * found, is considered proof that a Berkshire card has been found. | |
838 | * The initial rate is once per second at board start up, then twice | |
839 | * per second for normal operation. | |
840 | */ | |
841 | static int __init pcwd_checkcard(int base_addr) | |
842 | { | |
843 | int port0, last_port0; /* Reg 0, in case it's REV A */ | |
844 | int port1, last_port1; /* Register 1 for REV C cards */ | |
845 | int i; | |
846 | int retval; | |
847 | ||
848 | if (!request_region (base_addr, 4, "PCWD")) { | |
849 | printk (KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr); | |
850 | return 0; | |
851 | } | |
852 | ||
853 | retval = 0; | |
854 | ||
855 | port0 = inb_p(base_addr); /* For REV A boards */ | |
856 | port1 = inb_p(base_addr + 1); /* For REV C boards */ | |
857 | if (port0 != 0xff || port1 != 0xff) { | |
858 | /* Not an 'ff' from a floating bus, so must be a card! */ | |
859 | for (i = 0; i < 4; ++i) { | |
860 | ||
861 | msleep(500); | |
862 | ||
863 | last_port0 = port0; | |
864 | last_port1 = port1; | |
865 | ||
866 | port0 = inb_p(base_addr); | |
867 | port1 = inb_p(base_addr + 1); | |
868 | ||
869 | /* Has either hearbeat bit changed? */ | |
870 | if ((port0 ^ last_port0) & WD_HRTBT || | |
871 | (port1 ^ last_port1) & WD_REVC_HRBT) { | |
872 | retval = 1; | |
873 | break; | |
874 | } | |
875 | } | |
876 | } | |
877 | release_region (base_addr, 4); | |
878 | ||
879 | return retval; | |
880 | } | |
881 | ||
882 | /* | |
883 | * These are the auto-probe addresses available. | |
884 | * | |
885 | * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350. | |
886 | * Revision A has an address range of 2 addresses, while Revision C has 4. | |
887 | */ | |
888 | static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; | |
889 | ||
890 | static int __init pcwd_init_module(void) | |
891 | { | |
892 | int i, found = 0; | |
893 | ||
894 | spin_lock_init(&io_lock); | |
895 | ||
896 | for (i = 0; pcwd_ioports[i] != 0; i++) { | |
897 | if (pcwd_checkcard(pcwd_ioports[i])) { | |
898 | if (!(pcwatchdog_init(pcwd_ioports[i]))) | |
899 | found++; | |
900 | } | |
901 | } | |
902 | ||
903 | if (!found) { | |
904 | printk (KERN_INFO PFX "No card detected, or port not available\n"); | |
905 | return -ENODEV; | |
906 | } | |
907 | ||
908 | return 0; | |
909 | } | |
910 | ||
911 | static void __exit pcwd_cleanup_module(void) | |
912 | { | |
913 | if (current_readport) | |
914 | pcwatchdog_exit(); | |
915 | return; | |
916 | } | |
917 | ||
918 | module_init(pcwd_init_module); | |
919 | module_exit(pcwd_cleanup_module); | |
920 | ||
921 | MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>"); | |
922 | MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); | |
923 | MODULE_LICENSE("GPL"); | |
924 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
925 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |