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 */ | |
a2be8786 | 76 | #define WD_VER "1.16 (03/01/2006)" |
1da177e4 LT |
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; | |
1da177e4 | 136 | static int temp_panic; |
a2be8786 WVS |
137 | static struct { /* this is private data for each ISA-PC watchdog card */ |
138 | int revision; /* The card's revision */ | |
139 | int supports_temp; /* Wether or not the card has a temperature device */ | |
140 | int command_mode; /* Wether or not the card is in command mode */ | |
141 | int boot_status; /* The card's boot status */ | |
142 | int io_addr; /* The cards I/O address */ | |
143 | spinlock_t io_lock; /* the lock for io operations */ | |
144 | struct timer_list timer; /* The timer that pings the watchdog */ | |
145 | unsigned long next_heartbeat; /* the next_heartbeat for the timer */ | |
146 | } pcwd_private; | |
1da177e4 LT |
147 | |
148 | /* module parameters */ | |
149 | #define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat */ | |
150 | static int heartbeat = WATCHDOG_HEARTBEAT; | |
151 | module_param(heartbeat, int, 0); | |
152 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); | |
153 | ||
4bfdf378 | 154 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 LT |
155 | module_param(nowayout, int, 0); |
156 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
157 | ||
158 | /* | |
159 | * Internal functions | |
160 | */ | |
161 | ||
162 | static int send_isa_command(int cmd) | |
163 | { | |
164 | int i; | |
165 | int control_status; | |
166 | int port0, last_port0; /* Double read for stabilising */ | |
167 | ||
168 | /* The WCMD bit must be 1 and the command is only 4 bits in size */ | |
169 | control_status = (cmd & 0x0F) | 0x80; | |
a2be8786 | 170 | outb_p(control_status, pcwd_private.io_addr + 2); |
1da177e4 LT |
171 | udelay(ISA_COMMAND_TIMEOUT); |
172 | ||
a2be8786 | 173 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
174 | for (i = 0; i < 25; ++i) { |
175 | last_port0 = port0; | |
a2be8786 | 176 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
177 | |
178 | if (port0 == last_port0) | |
179 | break; /* Data is stable */ | |
180 | ||
181 | udelay (250); | |
182 | } | |
183 | ||
184 | return port0; | |
185 | } | |
186 | ||
187 | static int set_command_mode(void) | |
188 | { | |
189 | int i, found=0, count=0; | |
190 | ||
191 | /* Set the card into command mode */ | |
a2be8786 | 192 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
193 | while ((!found) && (count < 3)) { |
194 | i = send_isa_command(CMD_ISA_IDLE); | |
195 | ||
196 | if (i == 0x00) | |
197 | found = 1; | |
198 | else if (i == 0xF3) { | |
199 | /* Card does not like what we've done to it */ | |
a2be8786 | 200 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 | 201 | udelay(1200); /* Spec says wait 1ms */ |
a2be8786 | 202 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 LT |
203 | udelay(ISA_COMMAND_TIMEOUT); |
204 | } | |
205 | count++; | |
206 | } | |
a2be8786 WVS |
207 | spin_unlock(&pcwd_private.io_lock); |
208 | pcwd_private.command_mode = found; | |
1da177e4 LT |
209 | |
210 | return(found); | |
211 | } | |
212 | ||
213 | static void unset_command_mode(void) | |
214 | { | |
215 | /* Set the card into normal mode */ | |
a2be8786 WVS |
216 | spin_lock(&pcwd_private.io_lock); |
217 | outb_p(0x00, pcwd_private.io_addr + 2); | |
1da177e4 | 218 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 219 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 220 | |
a2be8786 | 221 | pcwd_private.command_mode = 0; |
1da177e4 LT |
222 | } |
223 | ||
224 | static void pcwd_timer_ping(unsigned long data) | |
225 | { | |
226 | int wdrst_stat; | |
227 | ||
228 | /* If we got a heartbeat pulse within the WDT_INTERVAL | |
229 | * we agree to ping the WDT */ | |
a2be8786 | 230 | if(time_before(jiffies, pcwd_private.next_heartbeat)) { |
1da177e4 | 231 | /* Ping the watchdog */ |
a2be8786 WVS |
232 | spin_lock(&pcwd_private.io_lock); |
233 | if (pcwd_private.revision == PCWD_REVISION_A) { | |
1da177e4 | 234 | /* Rev A cards are reset by setting the WD_WDRST bit in register 1 */ |
a2be8786 | 235 | wdrst_stat = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
236 | wdrst_stat &= 0x0F; |
237 | wdrst_stat |= WD_WDRST; | |
238 | ||
a2be8786 | 239 | outb_p(wdrst_stat, pcwd_private.io_addr + 1); |
1da177e4 LT |
240 | } else { |
241 | /* Re-trigger watchdog by writing to port 0 */ | |
a2be8786 | 242 | outb_p(0x00, pcwd_private.io_addr); |
1da177e4 LT |
243 | } |
244 | ||
245 | /* Re-set the timer interval */ | |
a2be8786 | 246 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 | 247 | |
a2be8786 | 248 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
249 | } else { |
250 | printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n"); | |
251 | } | |
252 | } | |
253 | ||
254 | static int pcwd_start(void) | |
255 | { | |
256 | int stat_reg; | |
257 | ||
a2be8786 | 258 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
1da177e4 LT |
259 | |
260 | /* Start the timer */ | |
a2be8786 | 261 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 LT |
262 | |
263 | /* Enable the port */ | |
a2be8786 WVS |
264 | if (pcwd_private.revision == PCWD_REVISION_C) { |
265 | spin_lock(&pcwd_private.io_lock); | |
266 | outb_p(0x00, pcwd_private.io_addr + 3); | |
1da177e4 | 267 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
268 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
269 | spin_unlock(&pcwd_private.io_lock); | |
1da177e4 LT |
270 | if (stat_reg & 0x10) { |
271 | printk(KERN_INFO PFX "Could not start watchdog\n"); | |
272 | return -EIO; | |
273 | } | |
274 | } | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int pcwd_stop(void) | |
279 | { | |
280 | int stat_reg; | |
281 | ||
282 | /* Stop the timer */ | |
a2be8786 | 283 | del_timer(&pcwd_private.timer); |
1da177e4 LT |
284 | |
285 | /* Disable the board */ | |
a2be8786 WVS |
286 | if (pcwd_private.revision == PCWD_REVISION_C) { |
287 | spin_lock(&pcwd_private.io_lock); | |
288 | outb_p(0xA5, pcwd_private.io_addr + 3); | |
1da177e4 | 289 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 290 | outb_p(0xA5, pcwd_private.io_addr + 3); |
1da177e4 | 291 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
292 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
293 | spin_unlock(&pcwd_private.io_lock); | |
1da177e4 LT |
294 | if ((stat_reg & 0x10) == 0) { |
295 | printk(KERN_INFO PFX "Could not stop watchdog\n"); | |
296 | return -EIO; | |
297 | } | |
298 | } | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static int pcwd_keepalive(void) | |
303 | { | |
304 | /* user land ping */ | |
a2be8786 | 305 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
1da177e4 LT |
306 | return 0; |
307 | } | |
308 | ||
309 | static int pcwd_set_heartbeat(int t) | |
310 | { | |
311 | if ((t < 2) || (t > 7200)) /* arbitrary upper limit */ | |
312 | return -EINVAL; | |
313 | ||
314 | heartbeat = t; | |
315 | return 0; | |
316 | } | |
317 | ||
318 | static int pcwd_get_status(int *status) | |
319 | { | |
320 | int card_status; | |
321 | ||
322 | *status=0; | |
a2be8786 WVS |
323 | spin_lock(&pcwd_private.io_lock); |
324 | if (pcwd_private.revision == PCWD_REVISION_A) | |
1da177e4 LT |
325 | /* Rev A cards return status information from |
326 | * the base register, which is used for the | |
327 | * temperature in other cards. */ | |
a2be8786 | 328 | card_status = inb(pcwd_private.io_addr); |
1da177e4 LT |
329 | else { |
330 | /* Rev C cards return card status in the base | |
331 | * address + 1 register. And use different bits | |
332 | * to indicate a card initiated reset, and an | |
333 | * over-temperature condition. And the reboot | |
334 | * status can be reset. */ | |
a2be8786 | 335 | card_status = inb(pcwd_private.io_addr + 1); |
1da177e4 | 336 | } |
a2be8786 | 337 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 338 | |
a2be8786 | 339 | if (pcwd_private.revision == PCWD_REVISION_A) { |
1da177e4 LT |
340 | if (card_status & WD_WDRST) |
341 | *status |= WDIOF_CARDRESET; | |
342 | ||
343 | if (card_status & WD_T110) { | |
344 | *status |= WDIOF_OVERHEAT; | |
345 | if (temp_panic) { | |
346 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
68acc05d | 347 | kernel_power_off(); |
1da177e4 LT |
348 | } |
349 | } | |
350 | } else { | |
351 | if (card_status & WD_REVC_WTRP) | |
352 | *status |= WDIOF_CARDRESET; | |
353 | ||
354 | if (card_status & WD_REVC_TTRP) { | |
355 | *status |= WDIOF_OVERHEAT; | |
356 | if (temp_panic) { | |
357 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
68acc05d | 358 | kernel_power_off(); |
1da177e4 LT |
359 | } |
360 | } | |
361 | } | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | static int pcwd_clear_status(void) | |
367 | { | |
a2be8786 WVS |
368 | if (pcwd_private.revision == PCWD_REVISION_C) { |
369 | spin_lock(&pcwd_private.io_lock); | |
370 | outb_p(0x00, pcwd_private.io_addr + 1); /* clear reset status */ | |
371 | spin_unlock(&pcwd_private.io_lock); | |
1da177e4 LT |
372 | } |
373 | return 0; | |
374 | } | |
375 | ||
376 | static int pcwd_get_temperature(int *temperature) | |
377 | { | |
378 | /* check that port 0 gives temperature info and no command results */ | |
a2be8786 | 379 | if (pcwd_private.command_mode) |
1da177e4 LT |
380 | return -1; |
381 | ||
382 | *temperature = 0; | |
a2be8786 | 383 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
384 | return -ENODEV; |
385 | ||
386 | /* | |
387 | * Convert celsius to fahrenheit, since this was | |
388 | * the decided 'standard' for this return value. | |
389 | */ | |
a2be8786 WVS |
390 | spin_lock(&pcwd_private.io_lock); |
391 | *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; | |
392 | spin_unlock(&pcwd_private.io_lock); | |
1da177e4 LT |
393 | |
394 | return 0; | |
395 | } | |
396 | ||
397 | /* | |
398 | * /dev/watchdog handling | |
399 | */ | |
400 | ||
401 | static int pcwd_ioctl(struct inode *inode, struct file *file, | |
402 | unsigned int cmd, unsigned long arg) | |
403 | { | |
404 | int rv; | |
405 | int status; | |
406 | int temperature; | |
407 | int new_heartbeat; | |
408 | int __user *argp = (int __user *)arg; | |
409 | static struct watchdog_info ident = { | |
410 | .options = WDIOF_OVERHEAT | | |
411 | WDIOF_CARDRESET | | |
412 | WDIOF_KEEPALIVEPING | | |
413 | WDIOF_SETTIMEOUT | | |
414 | WDIOF_MAGICCLOSE, | |
415 | .firmware_version = 1, | |
416 | .identity = "PCWD", | |
417 | }; | |
418 | ||
419 | switch(cmd) { | |
420 | default: | |
421 | return -ENOIOCTLCMD; | |
422 | ||
423 | case WDIOC_GETSUPPORT: | |
424 | if(copy_to_user(argp, &ident, sizeof(ident))) | |
425 | return -EFAULT; | |
426 | return 0; | |
427 | ||
428 | case WDIOC_GETSTATUS: | |
429 | pcwd_get_status(&status); | |
430 | return put_user(status, argp); | |
431 | ||
432 | case WDIOC_GETBOOTSTATUS: | |
a2be8786 | 433 | return put_user(pcwd_private.boot_status, argp); |
1da177e4 LT |
434 | |
435 | case WDIOC_GETTEMP: | |
436 | if (pcwd_get_temperature(&temperature)) | |
437 | return -EFAULT; | |
438 | ||
439 | return put_user(temperature, argp); | |
440 | ||
441 | case WDIOC_SETOPTIONS: | |
a2be8786 | 442 | if (pcwd_private.revision == PCWD_REVISION_C) |
1da177e4 LT |
443 | { |
444 | if(copy_from_user(&rv, argp, sizeof(int))) | |
445 | return -EFAULT; | |
446 | ||
447 | if (rv & WDIOS_DISABLECARD) | |
448 | { | |
449 | return pcwd_stop(); | |
450 | } | |
451 | ||
452 | if (rv & WDIOS_ENABLECARD) | |
453 | { | |
454 | return pcwd_start(); | |
455 | } | |
456 | ||
457 | if (rv & WDIOS_TEMPPANIC) | |
458 | { | |
459 | temp_panic = 1; | |
460 | } | |
461 | } | |
462 | return -EINVAL; | |
463 | ||
464 | case WDIOC_KEEPALIVE: | |
465 | pcwd_keepalive(); | |
466 | return 0; | |
467 | ||
468 | case WDIOC_SETTIMEOUT: | |
469 | if (get_user(new_heartbeat, argp)) | |
470 | return -EFAULT; | |
471 | ||
472 | if (pcwd_set_heartbeat(new_heartbeat)) | |
473 | return -EINVAL; | |
474 | ||
475 | pcwd_keepalive(); | |
476 | /* Fall */ | |
477 | ||
478 | case WDIOC_GETTIMEOUT: | |
479 | return put_user(heartbeat, argp); | |
480 | } | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, | |
486 | loff_t *ppos) | |
487 | { | |
488 | if (len) { | |
489 | if (!nowayout) { | |
490 | size_t i; | |
491 | ||
492 | /* In case it was set long ago */ | |
493 | expect_close = 0; | |
494 | ||
495 | for (i = 0; i != len; i++) { | |
496 | char c; | |
497 | ||
498 | if (get_user(c, buf + i)) | |
499 | return -EFAULT; | |
500 | if (c == 'V') | |
501 | expect_close = 42; | |
502 | } | |
503 | } | |
504 | pcwd_keepalive(); | |
505 | } | |
506 | return len; | |
507 | } | |
508 | ||
509 | static int pcwd_open(struct inode *inode, struct file *file) | |
510 | { | |
511 | if (!atomic_dec_and_test(&open_allowed) ) { | |
512 | atomic_inc( &open_allowed ); | |
513 | return -EBUSY; | |
514 | } | |
515 | ||
516 | if (nowayout) | |
517 | __module_get(THIS_MODULE); | |
518 | ||
519 | /* Activate */ | |
520 | pcwd_start(); | |
521 | pcwd_keepalive(); | |
522 | return nonseekable_open(inode, file); | |
523 | } | |
524 | ||
525 | static int pcwd_close(struct inode *inode, struct file *file) | |
526 | { | |
527 | if (expect_close == 42) { | |
528 | pcwd_stop(); | |
529 | } else { | |
530 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); | |
531 | pcwd_keepalive(); | |
532 | } | |
533 | expect_close = 0; | |
534 | atomic_inc( &open_allowed ); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | /* | |
539 | * /dev/temperature handling | |
540 | */ | |
541 | ||
542 | static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, | |
543 | loff_t *ppos) | |
544 | { | |
545 | int temperature; | |
546 | ||
547 | if (pcwd_get_temperature(&temperature)) | |
548 | return -EFAULT; | |
549 | ||
550 | if (copy_to_user(buf, &temperature, 1)) | |
551 | return -EFAULT; | |
552 | ||
553 | return 1; | |
554 | } | |
555 | ||
556 | static int pcwd_temp_open(struct inode *inode, struct file *file) | |
557 | { | |
a2be8786 | 558 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
559 | return -ENODEV; |
560 | ||
561 | return nonseekable_open(inode, file); | |
562 | } | |
563 | ||
564 | static int pcwd_temp_close(struct inode *inode, struct file *file) | |
565 | { | |
566 | return 0; | |
567 | } | |
568 | ||
569 | /* | |
570 | * Notify system | |
571 | */ | |
572 | ||
573 | static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
574 | { | |
575 | if (code==SYS_DOWN || code==SYS_HALT) { | |
576 | /* Turn the WDT off */ | |
577 | pcwd_stop(); | |
578 | } | |
579 | ||
580 | return NOTIFY_DONE; | |
581 | } | |
582 | ||
583 | /* | |
584 | * Kernel Interfaces | |
585 | */ | |
586 | ||
587 | static struct file_operations pcwd_fops = { | |
588 | .owner = THIS_MODULE, | |
589 | .llseek = no_llseek, | |
590 | .write = pcwd_write, | |
591 | .ioctl = pcwd_ioctl, | |
592 | .open = pcwd_open, | |
593 | .release = pcwd_close, | |
594 | }; | |
595 | ||
596 | static struct miscdevice pcwd_miscdev = { | |
597 | .minor = WATCHDOG_MINOR, | |
598 | .name = "watchdog", | |
599 | .fops = &pcwd_fops, | |
600 | }; | |
601 | ||
602 | static struct file_operations pcwd_temp_fops = { | |
603 | .owner = THIS_MODULE, | |
604 | .llseek = no_llseek, | |
605 | .read = pcwd_temp_read, | |
606 | .open = pcwd_temp_open, | |
607 | .release = pcwd_temp_close, | |
608 | }; | |
609 | ||
610 | static struct miscdevice temp_miscdev = { | |
611 | .minor = TEMP_MINOR, | |
612 | .name = "temperature", | |
613 | .fops = &pcwd_temp_fops, | |
614 | }; | |
615 | ||
616 | static struct notifier_block pcwd_notifier = { | |
617 | .notifier_call = pcwd_notify_sys, | |
618 | }; | |
619 | ||
620 | /* | |
621 | * Init & exit routines | |
622 | */ | |
623 | ||
624 | static inline void get_support(void) | |
625 | { | |
a2be8786 WVS |
626 | if (inb(pcwd_private.io_addr) != 0xF0) |
627 | pcwd_private.supports_temp = 1; | |
1da177e4 LT |
628 | } |
629 | ||
630 | static inline int get_revision(void) | |
631 | { | |
632 | int r = PCWD_REVISION_C; | |
633 | ||
a2be8786 | 634 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
635 | /* REV A cards use only 2 io ports; test |
636 | * presumes a floating bus reads as 0xff. */ | |
a2be8786 WVS |
637 | if ((inb(pcwd_private.io_addr + 2) == 0xFF) || |
638 | (inb(pcwd_private.io_addr + 3) == 0xFF)) | |
1da177e4 | 639 | r=PCWD_REVISION_A; |
a2be8786 | 640 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
641 | |
642 | return r; | |
643 | } | |
644 | ||
645 | static inline char *get_firmware(void) | |
646 | { | |
647 | int one, ten, hund, minor; | |
648 | char *ret; | |
649 | ||
650 | ret = kmalloc(6, GFP_KERNEL); | |
651 | if(ret == NULL) | |
652 | return NULL; | |
653 | ||
654 | if (set_command_mode()) { | |
655 | one = send_isa_command(CMD_ISA_VERSION_INTEGER); | |
656 | ten = send_isa_command(CMD_ISA_VERSION_TENTH); | |
657 | hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH); | |
658 | minor = send_isa_command(CMD_ISA_VERSION_MINOR); | |
659 | sprintf(ret, "%c.%c%c%c", one, ten, hund, minor); | |
660 | } | |
661 | else | |
662 | sprintf(ret, "ERROR"); | |
663 | ||
664 | unset_command_mode(); | |
665 | return(ret); | |
666 | } | |
667 | ||
668 | static inline int get_option_switches(void) | |
669 | { | |
670 | int rv=0; | |
671 | ||
672 | if (set_command_mode()) { | |
673 | /* Get switch settings */ | |
674 | rv = send_isa_command(CMD_ISA_SWITCH_SETTINGS); | |
675 | } | |
676 | ||
677 | unset_command_mode(); | |
678 | return(rv); | |
679 | } | |
680 | ||
681 | static int __devinit pcwatchdog_init(int base_addr) | |
682 | { | |
683 | int ret; | |
684 | char *firmware; | |
685 | int option_switches; | |
686 | ||
687 | cards_found++; | |
688 | if (cards_found == 1) | |
689 | printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER); | |
690 | ||
691 | if (cards_found > 1) { | |
692 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); | |
693 | return -ENODEV; | |
694 | } | |
695 | ||
696 | if (base_addr == 0x0000) { | |
697 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); | |
698 | return -ENODEV; | |
699 | } | |
a2be8786 | 700 | pcwd_private.io_addr = base_addr; |
1da177e4 LT |
701 | |
702 | /* Check card's revision */ | |
a2be8786 | 703 | pcwd_private.revision = get_revision(); |
1da177e4 | 704 | |
a2be8786 | 705 | if (!request_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { |
1da177e4 | 706 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", |
a2be8786 WVS |
707 | pcwd_private.io_addr); |
708 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
709 | return -EIO; |
710 | } | |
711 | ||
712 | /* Initial variables */ | |
a2be8786 | 713 | pcwd_private.supports_temp = 0; |
1da177e4 | 714 | temp_panic = 0; |
a2be8786 | 715 | pcwd_private.boot_status = 0x0000; |
1da177e4 LT |
716 | |
717 | /* get the boot_status */ | |
a2be8786 | 718 | pcwd_get_status(&pcwd_private.boot_status); |
1da177e4 LT |
719 | |
720 | /* clear the "card caused reboot" flag */ | |
721 | pcwd_clear_status(); | |
722 | ||
a2be8786 WVS |
723 | init_timer(&pcwd_private.timer); |
724 | pcwd_private.timer.function = pcwd_timer_ping; | |
725 | pcwd_private.timer.data = 0; | |
1da177e4 LT |
726 | |
727 | /* Disable the board */ | |
728 | pcwd_stop(); | |
729 | ||
730 | /* Check whether or not the card supports the temperature device */ | |
731 | get_support(); | |
732 | ||
733 | /* Get some extra info from the hardware (in command/debug/diag mode) */ | |
a2be8786 WVS |
734 | if (pcwd_private.revision == PCWD_REVISION_A) |
735 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", pcwd_private.io_addr); | |
736 | else if (pcwd_private.revision == PCWD_REVISION_C) { | |
1da177e4 LT |
737 | firmware = get_firmware(); |
738 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n", | |
a2be8786 | 739 | pcwd_private.io_addr, firmware); |
1da177e4 LT |
740 | kfree(firmware); |
741 | option_switches = get_option_switches(); | |
742 | printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", | |
743 | option_switches, | |
744 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
745 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
746 | ||
747 | /* Reprogram internal heartbeat to 2 seconds */ | |
748 | if (set_command_mode()) { | |
749 | send_isa_command(CMD_ISA_DELAY_TIME_2SECS); | |
750 | unset_command_mode(); | |
751 | } | |
752 | } else { | |
753 | /* Should NEVER happen, unless get_revision() fails. */ | |
754 | printk(KERN_INFO PFX "Unable to get revision\n"); | |
a2be8786 WVS |
755 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
756 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
757 | return -1; |
758 | } | |
759 | ||
a2be8786 | 760 | if (pcwd_private.supports_temp) |
1da177e4 LT |
761 | printk(KERN_INFO PFX "Temperature Option Detected\n"); |
762 | ||
a2be8786 | 763 | if (pcwd_private.boot_status & WDIOF_CARDRESET) |
1da177e4 LT |
764 | printk(KERN_INFO PFX "Previous reboot was caused by the card\n"); |
765 | ||
a2be8786 | 766 | if (pcwd_private.boot_status & WDIOF_OVERHEAT) { |
1da177e4 LT |
767 | printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n"); |
768 | printk(KERN_EMERG PFX "CPU Overheat\n"); | |
769 | } | |
770 | ||
a2be8786 | 771 | if (pcwd_private.boot_status == 0) |
1da177e4 LT |
772 | printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n"); |
773 | ||
774 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
fd41fa61 WVS |
775 | if (pcwd_set_heartbeat(heartbeat)) { |
776 | pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); | |
777 | printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n", | |
778 | WATCHDOG_HEARTBEAT); | |
1da177e4 LT |
779 | } |
780 | ||
781 | ret = register_reboot_notifier(&pcwd_notifier); | |
782 | if (ret) { | |
783 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", | |
784 | ret); | |
a2be8786 WVS |
785 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
786 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
787 | return ret; |
788 | } | |
789 | ||
a2be8786 | 790 | if (pcwd_private.supports_temp) { |
1da177e4 LT |
791 | ret = misc_register(&temp_miscdev); |
792 | if (ret) { | |
793 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
794 | TEMP_MINOR, ret); | |
795 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
796 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
797 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
798 | return ret; |
799 | } | |
800 | } | |
801 | ||
802 | ret = misc_register(&pcwd_miscdev); | |
803 | if (ret) { | |
804 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
805 | WATCHDOG_MINOR, ret); | |
a2be8786 | 806 | if (pcwd_private.supports_temp) |
1da177e4 LT |
807 | misc_deregister(&temp_miscdev); |
808 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
809 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
810 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
811 | return ret; |
812 | } | |
813 | ||
814 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
815 | heartbeat, nowayout); | |
816 | ||
817 | return 0; | |
818 | } | |
819 | ||
820 | static void __devexit pcwatchdog_exit(void) | |
821 | { | |
822 | /* Disable the board */ | |
823 | if (!nowayout) | |
824 | pcwd_stop(); | |
825 | ||
826 | /* Deregister */ | |
827 | misc_deregister(&pcwd_miscdev); | |
a2be8786 | 828 | if (pcwd_private.supports_temp) |
1da177e4 LT |
829 | misc_deregister(&temp_miscdev); |
830 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
831 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
832 | pcwd_private.io_addr = 0x0000; | |
f1c3a056 | 833 | cards_found--; |
1da177e4 LT |
834 | } |
835 | ||
836 | /* | |
837 | * The ISA cards have a heartbeat bit in one of the registers, which | |
838 | * register is card dependent. The heartbeat bit is monitored, and if | |
839 | * found, is considered proof that a Berkshire card has been found. | |
840 | * The initial rate is once per second at board start up, then twice | |
841 | * per second for normal operation. | |
842 | */ | |
843 | static int __init pcwd_checkcard(int base_addr) | |
844 | { | |
845 | int port0, last_port0; /* Reg 0, in case it's REV A */ | |
846 | int port1, last_port1; /* Register 1 for REV C cards */ | |
847 | int i; | |
848 | int retval; | |
849 | ||
850 | if (!request_region (base_addr, 4, "PCWD")) { | |
851 | printk (KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr); | |
852 | return 0; | |
853 | } | |
854 | ||
855 | retval = 0; | |
856 | ||
857 | port0 = inb_p(base_addr); /* For REV A boards */ | |
858 | port1 = inb_p(base_addr + 1); /* For REV C boards */ | |
859 | if (port0 != 0xff || port1 != 0xff) { | |
860 | /* Not an 'ff' from a floating bus, so must be a card! */ | |
861 | for (i = 0; i < 4; ++i) { | |
862 | ||
863 | msleep(500); | |
864 | ||
865 | last_port0 = port0; | |
866 | last_port1 = port1; | |
867 | ||
868 | port0 = inb_p(base_addr); | |
869 | port1 = inb_p(base_addr + 1); | |
870 | ||
871 | /* Has either hearbeat bit changed? */ | |
872 | if ((port0 ^ last_port0) & WD_HRTBT || | |
873 | (port1 ^ last_port1) & WD_REVC_HRBT) { | |
874 | retval = 1; | |
875 | break; | |
876 | } | |
877 | } | |
878 | } | |
879 | release_region (base_addr, 4); | |
880 | ||
881 | return retval; | |
882 | } | |
883 | ||
884 | /* | |
885 | * These are the auto-probe addresses available. | |
886 | * | |
887 | * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350. | |
888 | * Revision A has an address range of 2 addresses, while Revision C has 4. | |
889 | */ | |
890 | static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; | |
891 | ||
892 | static int __init pcwd_init_module(void) | |
893 | { | |
894 | int i, found = 0; | |
895 | ||
a2be8786 | 896 | spin_lock_init(&pcwd_private.io_lock); |
1da177e4 LT |
897 | |
898 | for (i = 0; pcwd_ioports[i] != 0; i++) { | |
899 | if (pcwd_checkcard(pcwd_ioports[i])) { | |
900 | if (!(pcwatchdog_init(pcwd_ioports[i]))) | |
901 | found++; | |
902 | } | |
903 | } | |
904 | ||
905 | if (!found) { | |
906 | printk (KERN_INFO PFX "No card detected, or port not available\n"); | |
907 | return -ENODEV; | |
908 | } | |
909 | ||
910 | return 0; | |
911 | } | |
912 | ||
913 | static void __exit pcwd_cleanup_module(void) | |
914 | { | |
a2be8786 | 915 | if (pcwd_private.io_addr) |
1da177e4 LT |
916 | pcwatchdog_exit(); |
917 | return; | |
918 | } | |
919 | ||
920 | module_init(pcwd_init_module); | |
921 | module_exit(pcwd_cleanup_module); | |
922 | ||
923 | MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>"); | |
924 | MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); | |
925 | MODULE_LICENSE("GPL"); | |
926 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
927 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |