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[PATCH] fix missing includes
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / char / watchdog / pcwd.c
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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
52#include <linux/module.h>
53#include <linux/moduleparam.h>
54#include <linux/types.h>
55#include <linux/timer.h>
56#include <linux/jiffies.h>
57#include <linux/config.h>
58#include <linux/wait.h>
59#include <linux/slab.h>
60#include <linux/ioport.h>
61#include <linux/delay.h>
62#include <linux/fs.h>
63#include <linux/miscdevice.h>
64#include <linux/watchdog.h>
65#include <linux/notifier.h>
66#include <linux/init.h>
67#include <linux/spinlock.h>
68#include <linux/reboot.h>
4e57b681 69#include <linux/sched.h> /* TASK_INTERRUPTIBLE, set_current_state() and friends */
1da177e4
LT		 70#include <asm/uaccess.h>
71#include <asm/io.h>
72
73#define WD_VER "1.16 (06/12/2004)"
74#define PFX "pcwd: "
75
76/*
77 * It should be noted that PCWD_REVISION_B was removed because A and B
78 * are essentially the same types of card, with the exception that B
79 * has temperature reporting. Since I didn't receive a Rev.B card,
80 * the Rev.B card is not supported. (It's a good thing too, as they
81 * are no longer in production.)
82 */
83#define PCWD_REVISION_A 1
84#define PCWD_REVISION_C 2
85
86/*
87 * These are the defines that describe the control status bits for the
88 * PC Watchdog card, revision A.
89 */
90#define WD_WDRST 0x01 /* Previously reset state */
91#define WD_T110 0x02 /* Temperature overheat sense */
92#define WD_HRTBT 0x04 /* Heartbeat sense */
93#define WD_RLY2 0x08 /* External relay triggered */
94#define WD_SRLY2 0x80 /* Software external relay triggered */
95
96/*
97 * These are the defines that describe the control status bits for the
98 * PC Watchdog card, revision C.
99 */
100#define WD_REVC_WTRP 0x01 /* Watchdog Trip status */
101#define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */
102#define WD_REVC_TTRP 0x04 /* Temperature Trip status */
103
104/* max. time we give an ISA watchdog card to process a command */
105/* 500ms for each 4 bit response (according to spec.) */
106#define ISA_COMMAND_TIMEOUT 1000
107
108/* Watchdog's internal commands */
109#define CMD_ISA_IDLE 0x00
110#define CMD_ISA_VERSION_INTEGER 0x01
111#define CMD_ISA_VERSION_TENTH 0x02
112#define CMD_ISA_VERSION_HUNDRETH 0x03
113#define CMD_ISA_VERSION_MINOR 0x04
114#define CMD_ISA_SWITCH_SETTINGS 0x05
115#define CMD_ISA_DELAY_TIME_2SECS 0x0A
116#define CMD_ISA_DELAY_TIME_4SECS 0x0B
117#define CMD_ISA_DELAY_TIME_8SECS 0x0C
118
119/*
120 * We are using an kernel timer to do the pinging of the watchdog
121 * every ~500ms. We try to set the internal heartbeat of the
122 * watchdog to 2 ms.
123 */
124
125#define WDT_INTERVAL (HZ/2+1)
126
127/* We can only use 1 card due to the /dev/watchdog restriction */
128static int cards_found;
129
130/* internal variables */
131static atomic_t open_allowed = ATOMIC_INIT(1);
132static char expect_close;
133static struct timer_list timer;
134static unsigned long next_heartbeat;
135static int temp_panic;
136static int revision; /* The card's revision */
137static int supports_temp; /* Wether or not the card has a temperature device */
138static int command_mode; /* Wether or not the card is in command mode */
139static int initial_status; /* The card's boot status */
140static int current_readport; /* The cards I/O address */
141static spinlock_t io_lock;
142
143/* module parameters */
144#define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat */
145static int heartbeat = WATCHDOG_HEARTBEAT;
146module_param(heartbeat, int, 0);
147MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
148
4bfdf378 149static int nowayout = WATCHDOG_NOWAYOUT;
1da177e4
LT		 150module_param(nowayout, int, 0);
151MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
152
153/*
154 * Internal functions
155 */
156
157static int send_isa_command(int cmd)
158{
159 int i;
160 int control_status;
161 int port0, last_port0; /* Double read for stabilising */
162
163 /* The WCMD bit must be 1 and the command is only 4 bits in size */
164 control_status = (cmd & 0x0F) | 0x80;
165 outb_p(control_status, current_readport + 2);
166 udelay(ISA_COMMAND_TIMEOUT);
167
168 port0 = inb_p(current_readport);
169 for (i = 0; i < 25; ++i) {
170 last_port0 = port0;
171 port0 = inb_p(current_readport);
172
173 if (port0 == last_port0)
174 break; /* Data is stable */
175
176 udelay (250);
177 }
178
179 return port0;
180}
181
182static int set_command_mode(void)
183{
184 int i, found=0, count=0;
185
186 /* Set the card into command mode */
187 spin_lock(&io_lock);
188 while ((!found) && (count < 3)) {
189 i = send_isa_command(CMD_ISA_IDLE);
190
191 if (i == 0x00)
192 found = 1;
193 else if (i == 0xF3) {
194 /* Card does not like what we've done to it */
195 outb_p(0x00, current_readport + 2);
196 udelay(1200); /* Spec says wait 1ms */
197 outb_p(0x00, current_readport + 2);
198 udelay(ISA_COMMAND_TIMEOUT);
199 }
200 count++;
201 }
202 spin_unlock(&io_lock);
203 command_mode = found;
204
205 return(found);
206}
207
208static void unset_command_mode(void)
209{
210 /* Set the card into normal mode */
211 spin_lock(&io_lock);
212 outb_p(0x00, current_readport + 2);
213 udelay(ISA_COMMAND_TIMEOUT);
214 spin_unlock(&io_lock);
215
216 command_mode = 0;
217}
218
219static void pcwd_timer_ping(unsigned long data)
220{
221 int wdrst_stat;
222
223 /* If we got a heartbeat pulse within the WDT_INTERVAL
224 * we agree to ping the WDT */
225 if(time_before(jiffies, next_heartbeat)) {
226 /* Ping the watchdog */
227 spin_lock(&io_lock);
228 if (revision == PCWD_REVISION_A) {
229 /* Rev A cards are reset by setting the WD_WDRST bit in register 1 */
230 wdrst_stat = inb_p(current_readport);
231 wdrst_stat &= 0x0F;
232 wdrst_stat |= WD_WDRST;
233
234 outb_p(wdrst_stat, current_readport + 1);
235 } else {
236 /* Re-trigger watchdog by writing to port 0 */
237 outb_p(0x00, current_readport);
238 }
239
240 /* Re-set the timer interval */
241 mod_timer(&timer, jiffies + WDT_INTERVAL);
242
243 spin_unlock(&io_lock);
244 } else {
245 printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
246 }
247}
248
249static int pcwd_start(void)
250{
251 int stat_reg;
252
253 next_heartbeat = jiffies + (heartbeat * HZ);
254
255 /* Start the timer */
256 mod_timer(&timer, jiffies + WDT_INTERVAL);
257
258 /* Enable the port */
259 if (revision == PCWD_REVISION_C) {
260 spin_lock(&io_lock);
261 outb_p(0x00, current_readport + 3);
262 udelay(ISA_COMMAND_TIMEOUT);
263 stat_reg = inb_p(current_readport + 2);
264 spin_unlock(&io_lock);
265 if (stat_reg & 0x10) {
266 printk(KERN_INFO PFX "Could not start watchdog\n");
267 return -EIO;
268 }
269 }
270 return 0;
271}
272
273static int pcwd_stop(void)
274{
275 int stat_reg;
276
277 /* Stop the timer */
278 del_timer(&timer);
279
280 /* Disable the board */
281 if (revision == PCWD_REVISION_C) {
282 spin_lock(&io_lock);
283 outb_p(0xA5, current_readport + 3);
284 udelay(ISA_COMMAND_TIMEOUT);
285 outb_p(0xA5, current_readport + 3);
286 udelay(ISA_COMMAND_TIMEOUT);
287 stat_reg = inb_p(current_readport + 2);
288 spin_unlock(&io_lock);
289 if ((stat_reg & 0x10) == 0) {
290 printk(KERN_INFO PFX "Could not stop watchdog\n");
291 return -EIO;
292 }
293 }
294 return 0;
295}
296
297static int pcwd_keepalive(void)
298{
299 /* user land ping */
300 next_heartbeat = jiffies + (heartbeat * HZ);
301 return 0;
302}
303
304static int pcwd_set_heartbeat(int t)
305{
306 if ((t < 2) || (t > 7200)) /* arbitrary upper limit */
307 return -EINVAL;
308
309 heartbeat = t;
310 return 0;
311}
312
313static int pcwd_get_status(int *status)
314{
315 int card_status;
316
317 *status=0;
318 spin_lock(&io_lock);
319 if (revision == PCWD_REVISION_A)
320 /* Rev A cards return status information from
321 * the base register, which is used for the
322 * temperature in other cards. */
323 card_status = inb(current_readport);
324 else {
325 /* Rev C cards return card status in the base
326 * address + 1 register. And use different bits
327 * to indicate a card initiated reset, and an
328 * over-temperature condition. And the reboot
329 * status can be reset. */
330 card_status = inb(current_readport + 1);
331 }
332 spin_unlock(&io_lock);
333
334 if (revision == PCWD_REVISION_A) {
335 if (card_status & WD_WDRST)
336 *status |= WDIOF_CARDRESET;
337
338 if (card_status & WD_T110) {
339 *status |= WDIOF_OVERHEAT;
340 if (temp_panic) {
341 printk (KERN_INFO PFX "Temperature overheat trip!\n");
68acc05d 342 kernel_power_off();
1da177e4
LT		 343 }
344 }
345 } else {
346 if (card_status & WD_REVC_WTRP)
347 *status |= WDIOF_CARDRESET;
348
349 if (card_status & WD_REVC_TTRP) {
350 *status |= WDIOF_OVERHEAT;
351 if (temp_panic) {
352 printk (KERN_INFO PFX "Temperature overheat trip!\n");
68acc05d 353 kernel_power_off();
1da177e4
LT		 354 }
355 }
356 }
357
358 return 0;
359}
360
361static int pcwd_clear_status(void)
362{
363 if (revision == PCWD_REVISION_C) {
364 spin_lock(&io_lock);
365 outb_p(0x00, current_readport + 1); /* clear reset status */
366 spin_unlock(&io_lock);
367 }
368 return 0;
369}
370
371static int pcwd_get_temperature(int *temperature)
372{
373 /* check that port 0 gives temperature info and no command results */
374 if (command_mode)
375 return -1;
376
377 *temperature = 0;
378 if (!supports_temp)
379 return -ENODEV;
380
381 /*
382 * Convert celsius to fahrenheit, since this was
383 * the decided 'standard' for this return value.
384 */
385 spin_lock(&io_lock);
386 *temperature = ((inb(current_readport)) * 9 / 5) + 32;
387 spin_unlock(&io_lock);
388
389 return 0;
390}
391
392/*
393 * /dev/watchdog handling
394 */
395
396static int pcwd_ioctl(struct inode *inode, struct file *file,
397 unsigned int cmd, unsigned long arg)
398{
399 int rv;
400 int status;
401 int temperature;
402 int new_heartbeat;
403 int __user *argp = (int __user *)arg;
404 static struct watchdog_info ident = {
405 .options = WDIOF_OVERHEAT |
406 WDIOF_CARDRESET |
407 WDIOF_KEEPALIVEPING |
408 WDIOF_SETTIMEOUT |
409 WDIOF_MAGICCLOSE,
410 .firmware_version = 1,
411 .identity = "PCWD",
412 };
413
414 switch(cmd) {
415 default:
416 return -ENOIOCTLCMD;
417
418 case WDIOC_GETSUPPORT:
419 if(copy_to_user(argp, &ident, sizeof(ident)))
420 return -EFAULT;
421 return 0;
422
423 case WDIOC_GETSTATUS:
424 pcwd_get_status(&status);
425 return put_user(status, argp);
426
427 case WDIOC_GETBOOTSTATUS:
428 return put_user(initial_status, argp);
429
430 case WDIOC_GETTEMP:
431 if (pcwd_get_temperature(&temperature))
432 return -EFAULT;
433
434 return put_user(temperature, argp);
435
436 case WDIOC_SETOPTIONS:
437 if (revision == PCWD_REVISION_C)
438 {
439 if(copy_from_user(&rv, argp, sizeof(int)))
440 return -EFAULT;
441
442 if (rv & WDIOS_DISABLECARD)
443 {
444 return pcwd_stop();
445 }
446
447 if (rv & WDIOS_ENABLECARD)
448 {
449 return pcwd_start();
450 }
451
452 if (rv & WDIOS_TEMPPANIC)
453 {
454 temp_panic = 1;
455 }
456 }
457 return -EINVAL;
458
459 case WDIOC_KEEPALIVE:
460 pcwd_keepalive();
461 return 0;
462
463 case WDIOC_SETTIMEOUT:
464 if (get_user(new_heartbeat, argp))
465 return -EFAULT;
466
467 if (pcwd_set_heartbeat(new_heartbeat))
468 return -EINVAL;
469
470 pcwd_keepalive();
471 /* Fall */
472
473 case WDIOC_GETTIMEOUT:
474 return put_user(heartbeat, argp);
475 }
476
477 return 0;
478}
479
480static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len,
481 loff_t *ppos)
482{
483 if (len) {
484 if (!nowayout) {
485 size_t i;
486
487 /* In case it was set long ago */
488 expect_close = 0;
489
490 for (i = 0; i != len; i++) {
491 char c;
492
493 if (get_user(c, buf + i))
494 return -EFAULT;
495 if (c == 'V')
496 expect_close = 42;
497 }
498 }
499 pcwd_keepalive();
500 }
501 return len;
502}
503
504static int pcwd_open(struct inode *inode, struct file *file)
505{
506 if (!atomic_dec_and_test(&open_allowed) ) {
507 atomic_inc( &open_allowed );
508 return -EBUSY;
509 }
510
511 if (nowayout)
512 __module_get(THIS_MODULE);
513
514 /* Activate */
515 pcwd_start();
516 pcwd_keepalive();
517 return nonseekable_open(inode, file);
518}
519
520static int pcwd_close(struct inode *inode, struct file *file)
521{
522 if (expect_close == 42) {
523 pcwd_stop();
524 } else {
525 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
526 pcwd_keepalive();
527 }
528 expect_close = 0;
529 atomic_inc( &open_allowed );
530 return 0;
531}
532
533/*
534 * /dev/temperature handling
535 */
536
537static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count,
538 loff_t *ppos)
539{
540 int temperature;
541
542 if (pcwd_get_temperature(&temperature))
543 return -EFAULT;
544
545 if (copy_to_user(buf, &temperature, 1))
546 return -EFAULT;
547
548 return 1;
549}
550
551static int pcwd_temp_open(struct inode *inode, struct file *file)
552{
553 if (!supports_temp)
554 return -ENODEV;
555
556 return nonseekable_open(inode, file);
557}
558
559static int pcwd_temp_close(struct inode *inode, struct file *file)
560{
561 return 0;
562}
563
564/*
565 * Notify system
566 */
567
568static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
569{
570 if (code==SYS_DOWN || code==SYS_HALT) {
571 /* Turn the WDT off */
572 pcwd_stop();
573 }
574
575 return NOTIFY_DONE;
576}
577
578/*
579 * Kernel Interfaces
580 */
581
582static struct file_operations pcwd_fops = {
583 .owner = THIS_MODULE,
584 .llseek = no_llseek,
585 .write = pcwd_write,
586 .ioctl = pcwd_ioctl,
587 .open = pcwd_open,
588 .release = pcwd_close,
589};
590
591static struct miscdevice pcwd_miscdev = {
592 .minor = WATCHDOG_MINOR,
593 .name = "watchdog",
594 .fops = &pcwd_fops,
595};
596
597static struct file_operations pcwd_temp_fops = {
598 .owner = THIS_MODULE,
599 .llseek = no_llseek,
600 .read = pcwd_temp_read,
601 .open = pcwd_temp_open,
602 .release = pcwd_temp_close,
603};
604
605static struct miscdevice temp_miscdev = {
606 .minor = TEMP_MINOR,
607 .name = "temperature",
608 .fops = &pcwd_temp_fops,
609};
610
611static struct notifier_block pcwd_notifier = {
612 .notifier_call = pcwd_notify_sys,
613};
614
615/*
616 * Init & exit routines
617 */
618
619static inline void get_support(void)
620{
621 if (inb(current_readport) != 0xF0)
622 supports_temp = 1;
623}
624
625static inline int get_revision(void)
626{
627 int r = PCWD_REVISION_C;
628
629 spin_lock(&io_lock);
630 /* REV A cards use only 2 io ports; test
631 * presumes a floating bus reads as 0xff. */
632 if ((inb(current_readport + 2) == 0xFF) ||
633 (inb(current_readport + 3) == 0xFF))
634 r=PCWD_REVISION_A;
635 spin_unlock(&io_lock);
636
637 return r;
638}
639
640static inline char *get_firmware(void)
641{
642 int one, ten, hund, minor;
643 char *ret;
644
645 ret = kmalloc(6, GFP_KERNEL);
646 if(ret == NULL)
647 return NULL;
648
649 if (set_command_mode()) {
650 one = send_isa_command(CMD_ISA_VERSION_INTEGER);
651 ten = send_isa_command(CMD_ISA_VERSION_TENTH);
652 hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH);
653 minor = send_isa_command(CMD_ISA_VERSION_MINOR);
654 sprintf(ret, "%c.%c%c%c", one, ten, hund, minor);
655 }
656 else
657 sprintf(ret, "ERROR");
658
659 unset_command_mode();
660 return(ret);
661}
662
663static inline int get_option_switches(void)
664{
665 int rv=0;
666
667 if (set_command_mode()) {
668 /* Get switch settings */
669 rv = send_isa_command(CMD_ISA_SWITCH_SETTINGS);
670 }
671
672 unset_command_mode();
673 return(rv);
674}
675
676static int __devinit pcwatchdog_init(int base_addr)
677{
678 int ret;
679 char *firmware;
680 int option_switches;
681
682 cards_found++;
683 if (cards_found == 1)
684 printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER);
685
686 if (cards_found > 1) {
687 printk(KERN_ERR PFX "This driver only supports 1 device\n");
688 return -ENODEV;
689 }
690
691 if (base_addr == 0x0000) {
692 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
693 return -ENODEV;
694 }
695 current_readport = base_addr;
696
697 /* Check card's revision */
698 revision = get_revision();
699
700 if (!request_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {
701 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
702 current_readport);
703 current_readport = 0x0000;
704 return -EIO;
705 }
706
707 /* Initial variables */
708 supports_temp = 0;
709 temp_panic = 0;
710 initial_status = 0x0000;
711
712 /* get the boot_status */
713 pcwd_get_status(&initial_status);
714
715 /* clear the "card caused reboot" flag */
716 pcwd_clear_status();
717
718 init_timer(&timer);
719 timer.function = pcwd_timer_ping;
720 timer.data = 0;
721
722 /* Disable the board */
723 pcwd_stop();
724
725 /* Check whether or not the card supports the temperature device */
726 get_support();
727
728 /* Get some extra info from the hardware (in command/debug/diag mode) */
729 if (revision == PCWD_REVISION_A)
730 printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", current_readport);
731 else if (revision == PCWD_REVISION_C) {
732 firmware = get_firmware();
733 printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n",
734 current_readport, firmware);
735 kfree(firmware);
736 option_switches = get_option_switches();
737 printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
738 option_switches,
739 ((option_switches & 0x10) ? "ON" : "OFF"),
740 ((option_switches & 0x08) ? "ON" : "OFF"));
741
742 /* Reprogram internal heartbeat to 2 seconds */
743 if (set_command_mode()) {
744 send_isa_command(CMD_ISA_DELAY_TIME_2SECS);
745 unset_command_mode();
746 }
747 } else {
748 /* Should NEVER happen, unless get_revision() fails. */
749 printk(KERN_INFO PFX "Unable to get revision\n");
750 release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
751 current_readport = 0x0000;
752 return -1;
753 }
754
755 if (supports_temp)
756 printk(KERN_INFO PFX "Temperature Option Detected\n");
757
758 if (initial_status & WDIOF_CARDRESET)
759 printk(KERN_INFO PFX "Previous reboot was caused by the card\n");
760
761 if (initial_status & WDIOF_OVERHEAT) {
762 printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n");
763 printk(KERN_EMERG PFX "CPU Overheat\n");
764 }
765
766 if (initial_status == 0)
767 printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
768
769 /* Check that the heartbeat value is within it's range ; if not reset to the default */
770 if (pcwd_set_heartbeat(heartbeat)) {
771 pcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
772 printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n",
773 WATCHDOG_HEARTBEAT);
774 }
775
776 ret = register_reboot_notifier(&pcwd_notifier);
777 if (ret) {
778 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
779 ret);
780 release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
781 current_readport = 0x0000;
782 return ret;
783 }
784
785 if (supports_temp) {
786 ret = misc_register(&temp_miscdev);
787 if (ret) {
788 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
789 TEMP_MINOR, ret);
790 unregister_reboot_notifier(&pcwd_notifier);
791 release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
792 current_readport = 0x0000;
793 return ret;
794 }
795 }
796
797 ret = misc_register(&pcwd_miscdev);
798 if (ret) {
799 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
800 WATCHDOG_MINOR, ret);
801 if (supports_temp)
802 misc_deregister(&temp_miscdev);
803 unregister_reboot_notifier(&pcwd_notifier);
804 release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
805 current_readport = 0x0000;
806 return ret;
807 }
808
809 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
810 heartbeat, nowayout);
811
812 return 0;
813}
814
815static void __devexit pcwatchdog_exit(void)
816{
817 /* Disable the board */
818 if (!nowayout)
819 pcwd_stop();
820
821 /* Deregister */
822 misc_deregister(&pcwd_miscdev);
823 if (supports_temp)
824 misc_deregister(&temp_miscdev);
825 unregister_reboot_notifier(&pcwd_notifier);
826 release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
827 current_readport = 0x0000;
828}
829
830/*
831 * The ISA cards have a heartbeat bit in one of the registers, which
832 * register is card dependent. The heartbeat bit is monitored, and if
833 * found, is considered proof that a Berkshire card has been found.
834 * The initial rate is once per second at board start up, then twice
835 * per second for normal operation.
836 */
837static int __init pcwd_checkcard(int base_addr)
838{
839 int port0, last_port0; /* Reg 0, in case it's REV A */
840 int port1, last_port1; /* Register 1 for REV C cards */
841 int i;
842 int retval;
843
844 if (!request_region (base_addr, 4, "PCWD")) {
845 printk (KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr);
846 return 0;
847 }
848
849 retval = 0;
850
851 port0 = inb_p(base_addr); /* For REV A boards */
852 port1 = inb_p(base_addr + 1); /* For REV C boards */
853 if (port0 != 0xff || port1 != 0xff) {
854 /* Not an 'ff' from a floating bus, so must be a card! */
855 for (i = 0; i < 4; ++i) {
856
857 msleep(500);
858
859 last_port0 = port0;
860 last_port1 = port1;
861
862 port0 = inb_p(base_addr);
863 port1 = inb_p(base_addr + 1);
864
865 /* Has either hearbeat bit changed? */
866 if ((port0 ^ last_port0) & WD_HRTBT ||
867 (port1 ^ last_port1) & WD_REVC_HRBT) {
868 retval = 1;
869 break;
870 }
871 }
872 }
873 release_region (base_addr, 4);
874
875 return retval;
876}
877
878/*
879 * These are the auto-probe addresses available.
880 *
881 * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350.
882 * Revision A has an address range of 2 addresses, while Revision C has 4.
883 */
884static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 };
885
886static int __init pcwd_init_module(void)
887{
888 int i, found = 0;
889
890 spin_lock_init(&io_lock);
891
892 for (i = 0; pcwd_ioports[i] != 0; i++) {
893 if (pcwd_checkcard(pcwd_ioports[i])) {
894 if (!(pcwatchdog_init(pcwd_ioports[i])))
895 found++;
896 }
897 }
898
899 if (!found) {
900 printk (KERN_INFO PFX "No card detected, or port not available\n");
901 return -ENODEV;
902 }
903
904 return 0;
905}
906
907static void __exit pcwd_cleanup_module(void)
908{
909 if (current_readport)
910 pcwatchdog_exit();
911 return;
912}
913
914module_init(pcwd_init_module);
915module_exit(pcwd_cleanup_module);
916
917MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>");
918MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver");
919MODULE_LICENSE("GPL");
920MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
921MODULE_ALIAS_MISCDEV(TEMP_MINOR);
kernel source for telekom puls (alcatel/mediatek)