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1 | /* |
2 | * PC Watchdog Driver |
3 | * by Ken Hollis (khollis@bitgate.com) |
4 | * |
5 | * Permission granted from Simon Machell (smachell@berkprod.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 |
44 | * CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com> |
45 | * Added timeout module option to override default |
46 | */ |
47 | |
48 | /* |
49 | * A bells and whistles driver is available from http://www.pcwd.de/ |
50 | * More info available at http://www.berkprod.com/ or |
51 | * http://www.pcwatchdog.com/ |
52 | */ |
53 | |
54 | #include <linux/module.h> /* For module specific items */ |
55 | #include <linux/moduleparam.h> /* For new moduleparam's */ |
56 | #include <linux/types.h> /* For standard types (like size_t) */ |
57 | #include <linux/errno.h> /* For the -ENODEV/... values */ |
58 | #include <linux/kernel.h> /* For printk/panic/... */ |
59 | #include <linux/delay.h> /* For mdelay function */ |
60 | #include <linux/timer.h> /* For timer related operations */ |
61 | #include <linux/jiffies.h> /* For jiffies stuff */ |
62 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ |
63 | #include <linux/watchdog.h> /* For the watchdog specific items */ |
64 | #include <linux/reboot.h> /* For kernel_power_off() */ |
65 | #include <linux/init.h> /* For __init/__exit/... */ |
66 | #include <linux/fs.h> /* For file operations */ |
67 | #include <linux/isa.h> /* For isa devices */ |
68 | #include <linux/ioport.h> /* For io-port access */ |
69 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ |
70 | #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ |
71 | #include <linux/io.h> /* For inb/outb/... */ |
72 | |
73 | /* Module and version information */ |
74 | #define WATCHDOG_VERSION "1.20" |
75 | #define WATCHDOG_DATE "18 Feb 2007" |
76 | #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog" |
77 | #define WATCHDOG_NAME "pcwd" |
78 | #define PFX WATCHDOG_NAME ": " |
79 | #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n" |
80 | |
81 | /* |
82 | * It should be noted that PCWD_REVISION_B was removed because A and B |
83 | * are essentially the same types of card, with the exception that B |
84 | * has temperature reporting. Since I didn't receive a Rev.B card, |
85 | * the Rev.B card is not supported. (It's a good thing too, as they |
86 | * are no longer in production.) |
87 | */ |
88 | #define PCWD_REVISION_A 1 |
89 | #define PCWD_REVISION_C 2 |
90 | |
91 | /* |
92 | * These are the auto-probe addresses available. |
93 | * |
94 | * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350. |
95 | * Revision A has an address range of 2 addresses, while Revision C has 4. |
96 | */ |
97 | #define PCWD_ISA_NR_CARDS 3 |
98 | static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; |
99 | |
100 | /* |
101 | * These are the defines that describe the control status bits for the |
102 | * PCI-PC Watchdog card. |
103 | */ |
104 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */ |
105 | #define WD_WDRST 0x01 /* Previously reset state */ |
106 | #define WD_T110 0x02 /* Temperature overheat sense */ |
107 | #define WD_HRTBT 0x04 /* Heartbeat sense */ |
108 | #define WD_RLY2 0x08 /* External relay triggered */ |
109 | #define WD_SRLY2 0x80 /* Software external relay triggered */ |
110 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */ |
111 | #define WD_REVC_WTRP 0x01 /* Watchdog Trip status */ |
112 | #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */ |
113 | #define WD_REVC_TTRP 0x04 /* Temperature Trip status */ |
114 | #define WD_REVC_RL2A 0x08 /* Relay 2 activated by |
115 | on-board processor */ |
116 | #define WD_REVC_RL1A 0x10 /* Relay 1 active */ |
117 | #define WD_REVC_R2DS 0x40 /* Relay 2 disable */ |
118 | #define WD_REVC_RLY2 0x80 /* Relay 2 activated? */ |
119 | /* Port 2 : Control Status #2 */ |
120 | #define WD_WDIS 0x10 /* Watchdog Disabled */ |
121 | #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */ |
122 | #define WD_SSEL 0x40 /* Watchdog Switch Select |
123 | (1:SW1 <-> 0:SW2) */ |
124 | #define WD_WCMD 0x80 /* Watchdog Command Mode */ |
125 | |
126 | /* max. time we give an ISA watchdog card to process a command */ |
127 | /* 500ms for each 4 bit response (according to spec.) */ |
128 | #define ISA_COMMAND_TIMEOUT 1000 |
129 | |
130 | /* Watchdog's internal commands */ |
131 | #define CMD_ISA_IDLE 0x00 |
132 | #define CMD_ISA_VERSION_INTEGER 0x01 |
133 | #define CMD_ISA_VERSION_TENTH 0x02 |
134 | #define CMD_ISA_VERSION_HUNDRETH 0x03 |
135 | #define CMD_ISA_VERSION_MINOR 0x04 |
136 | #define CMD_ISA_SWITCH_SETTINGS 0x05 |
137 | #define CMD_ISA_RESET_PC 0x06 |
138 | #define CMD_ISA_ARM_0 0x07 |
139 | #define CMD_ISA_ARM_30 0x08 |
140 | #define CMD_ISA_ARM_60 0x09 |
141 | #define CMD_ISA_DELAY_TIME_2SECS 0x0A |
142 | #define CMD_ISA_DELAY_TIME_4SECS 0x0B |
143 | #define CMD_ISA_DELAY_TIME_8SECS 0x0C |
144 | #define CMD_ISA_RESET_RELAYS 0x0D |
145 | |
146 | /* Watchdog's Dip Switch heartbeat values */ |
147 | static const int heartbeat_tbl[] = { |
148 | 20, /* OFF-OFF-OFF = 20 Sec */ |
149 | 40, /* OFF-OFF-ON = 40 Sec */ |
150 | 60, /* OFF-ON-OFF = 1 Min */ |
151 | 300, /* OFF-ON-ON = 5 Min */ |
152 | 600, /* ON-OFF-OFF = 10 Min */ |
153 | 1800, /* ON-OFF-ON = 30 Min */ |
154 | 3600, /* ON-ON-OFF = 1 Hour */ |
155 | 7200, /* ON-ON-ON = 2 hour */ |
156 | }; |
157 | |
158 | /* |
159 | * We are using an kernel timer to do the pinging of the watchdog |
160 | * every ~500ms. We try to set the internal heartbeat of the |
161 | * watchdog to 2 ms. |
162 | */ |
163 | |
164 | #define WDT_INTERVAL (HZ/2+1) |
165 | |
166 | /* We can only use 1 card due to the /dev/watchdog restriction */ |
167 | static int cards_found; |
168 | |
169 | /* internal variables */ |
170 | static unsigned long open_allowed; |
171 | static char expect_close; |
172 | static int temp_panic; |
173 | |
174 | /* this is private data for each ISA-PC watchdog card */ |
175 | static struct { |
176 | char fw_ver_str[6]; /* The cards firmware version */ |
177 | int revision; /* The card's revision */ |
178 | int supports_temp; /* Whether or not the card has |
179 | a temperature device */ |
180 | int command_mode; /* Whether or not the card is in |
181 | command mode */ |
182 | int boot_status; /* The card's boot status */ |
183 | int io_addr; /* The cards I/O address */ |
184 | spinlock_t io_lock; /* the lock for io operations */ |
185 | struct timer_list timer; /* The timer that pings the watchdog */ |
186 | unsigned long next_heartbeat; /* the next_heartbeat for the timer */ |
187 | } pcwd_private; |
188 | |
189 | /* module parameters */ |
190 | #define QUIET 0 /* Default */ |
191 | #define VERBOSE 1 /* Verbose */ |
192 | #define DEBUG 2 /* print fancy stuff too */ |
193 | static int debug = QUIET; |
194 | module_param(debug, int, 0); |
195 | MODULE_PARM_DESC(debug, |
196 | "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); |
197 | |
198 | /* default heartbeat = delay-time from dip-switches */ |
199 | #define WATCHDOG_HEARTBEAT 0 |
200 | static int heartbeat = WATCHDOG_HEARTBEAT; |
201 | module_param(heartbeat, int, 0); |
202 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " |
203 | "(2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default=" |
204 | __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
205 | |
206 | static int nowayout = WATCHDOG_NOWAYOUT; |
207 | module_param(nowayout, int, 0); |
208 | MODULE_PARM_DESC(nowayout, |
209 | "Watchdog cannot be stopped once started (default=" |
210 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
211 | |
212 | /* |
213 | * Internal functions |
214 | */ |
215 | |
216 | static int send_isa_command(int cmd) |
217 | { |
218 | int i; |
219 | int control_status; |
220 | int port0, last_port0; /* Double read for stabilising */ |
221 | |
222 | if (debug >= DEBUG) |
223 | printk(KERN_DEBUG PFX "sending following data cmd=0x%02x\n", |
224 | cmd); |
225 | |
226 | /* The WCMD bit must be 1 and the command is only 4 bits in size */ |
227 | control_status = (cmd & 0x0F) | WD_WCMD; |
228 | outb_p(control_status, pcwd_private.io_addr + 2); |
229 | udelay(ISA_COMMAND_TIMEOUT); |
230 | |
231 | port0 = inb_p(pcwd_private.io_addr); |
232 | for (i = 0; i < 25; ++i) { |
233 | last_port0 = port0; |
234 | port0 = inb_p(pcwd_private.io_addr); |
235 | |
236 | if (port0 == last_port0) |
237 | break; /* Data is stable */ |
238 | |
239 | udelay(250); |
240 | } |
241 | |
242 | if (debug >= DEBUG) |
243 | printk(KERN_DEBUG PFX "received following data for " |
244 | "cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n", |
245 | cmd, port0, last_port0); |
246 | |
247 | return port0; |
248 | } |
249 | |
250 | static int set_command_mode(void) |
251 | { |
252 | int i, found = 0, count = 0; |
253 | |
254 | /* Set the card into command mode */ |
255 | spin_lock(&pcwd_private.io_lock); |
256 | while ((!found) && (count < 3)) { |
257 | i = send_isa_command(CMD_ISA_IDLE); |
258 | |
259 | if (i == 0x00) |
260 | found = 1; |
261 | else if (i == 0xF3) { |
262 | /* Card does not like what we've done to it */ |
263 | outb_p(0x00, pcwd_private.io_addr + 2); |
264 | udelay(1200); /* Spec says wait 1ms */ |
265 | outb_p(0x00, pcwd_private.io_addr + 2); |
266 | udelay(ISA_COMMAND_TIMEOUT); |
267 | } |
268 | count++; |
269 | } |
270 | spin_unlock(&pcwd_private.io_lock); |
271 | pcwd_private.command_mode = found; |
272 | |
273 | if (debug >= DEBUG) |
274 | printk(KERN_DEBUG PFX "command_mode=%d\n", |
275 | pcwd_private.command_mode); |
276 | |
277 | return found; |
278 | } |
279 | |
280 | static void unset_command_mode(void) |
281 | { |
282 | /* Set the card into normal mode */ |
283 | spin_lock(&pcwd_private.io_lock); |
284 | outb_p(0x00, pcwd_private.io_addr + 2); |
285 | udelay(ISA_COMMAND_TIMEOUT); |
286 | spin_unlock(&pcwd_private.io_lock); |
287 | |
288 | pcwd_private.command_mode = 0; |
289 | |
290 | if (debug >= DEBUG) |
291 | printk(KERN_DEBUG PFX "command_mode=%d\n", |
292 | pcwd_private.command_mode); |
293 | } |
294 | |
295 | static inline void pcwd_check_temperature_support(void) |
296 | { |
297 | if (inb(pcwd_private.io_addr) != 0xF0) |
298 | pcwd_private.supports_temp = 1; |
299 | } |
300 | |
301 | static inline void pcwd_get_firmware(void) |
302 | { |
303 | int one, ten, hund, minor; |
304 | |
305 | strcpy(pcwd_private.fw_ver_str, "ERROR"); |
306 | |
307 | if (set_command_mode()) { |
308 | one = send_isa_command(CMD_ISA_VERSION_INTEGER); |
309 | ten = send_isa_command(CMD_ISA_VERSION_TENTH); |
310 | hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH); |
311 | minor = send_isa_command(CMD_ISA_VERSION_MINOR); |
312 | sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", |
313 | one, ten, hund, minor); |
314 | } |
315 | unset_command_mode(); |
316 | |
317 | return; |
318 | } |
319 | |
320 | static inline int pcwd_get_option_switches(void) |
321 | { |
322 | int option_switches = 0; |
323 | |
324 | if (set_command_mode()) { |
325 | /* Get switch settings */ |
326 | option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS); |
327 | } |
328 | |
329 | unset_command_mode(); |
330 | return option_switches; |
331 | } |
332 | |
333 | static void pcwd_show_card_info(void) |
334 | { |
335 | int option_switches; |
336 | |
337 | /* Get some extra info from the hardware (in command/debug/diag mode) */ |
338 | if (pcwd_private.revision == PCWD_REVISION_A) |
339 | printk(KERN_INFO PFX |
340 | "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", |
341 | pcwd_private.io_addr); |
342 | else if (pcwd_private.revision == PCWD_REVISION_C) { |
343 | pcwd_get_firmware(); |
344 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port " |
345 | "0x%04x (Firmware version: %s)\n", |
346 | pcwd_private.io_addr, pcwd_private.fw_ver_str); |
347 | option_switches = pcwd_get_option_switches(); |
348 | printk(KERN_INFO PFX "Option switches (0x%02x): " |
349 | "Temperature Reset Enable=%s, Power On Delay=%s\n", |
350 | option_switches, |
351 | ((option_switches & 0x10) ? "ON" : "OFF"), |
352 | ((option_switches & 0x08) ? "ON" : "OFF")); |
353 | |
354 | /* Reprogram internal heartbeat to 2 seconds */ |
355 | if (set_command_mode()) { |
356 | send_isa_command(CMD_ISA_DELAY_TIME_2SECS); |
357 | unset_command_mode(); |
358 | } |
359 | } |
360 | |
361 | if (pcwd_private.supports_temp) |
362 | printk(KERN_INFO PFX "Temperature Option Detected\n"); |
363 | |
364 | if (pcwd_private.boot_status & WDIOF_CARDRESET) |
365 | printk(KERN_INFO PFX |
366 | "Previous reboot was caused by the card\n"); |
367 | |
368 | if (pcwd_private.boot_status & WDIOF_OVERHEAT) { |
369 | printk(KERN_EMERG PFX |
370 | "Card senses a CPU Overheat. Panicking!\n"); |
371 | printk(KERN_EMERG PFX |
372 | "CPU Overheat\n"); |
373 | } |
374 | |
375 | if (pcwd_private.boot_status == 0) |
376 | printk(KERN_INFO PFX |
377 | "No previous trip detected - Cold boot or reset\n"); |
378 | } |
379 | |
380 | static void pcwd_timer_ping(unsigned long data) |
381 | { |
382 | int wdrst_stat; |
383 | |
384 | /* If we got a heartbeat pulse within the WDT_INTERVAL |
385 | * we agree to ping the WDT */ |
386 | if (time_before(jiffies, pcwd_private.next_heartbeat)) { |
387 | /* Ping the watchdog */ |
388 | spin_lock(&pcwd_private.io_lock); |
389 | if (pcwd_private.revision == PCWD_REVISION_A) { |
390 | /* Rev A cards are reset by setting the |
391 | WD_WDRST bit in register 1 */ |
392 | wdrst_stat = inb_p(pcwd_private.io_addr); |
393 | wdrst_stat &= 0x0F; |
394 | wdrst_stat |= WD_WDRST; |
395 | |
396 | outb_p(wdrst_stat, pcwd_private.io_addr + 1); |
397 | } else { |
398 | /* Re-trigger watchdog by writing to port 0 */ |
399 | outb_p(0x00, pcwd_private.io_addr); |
400 | } |
401 | |
402 | /* Re-set the timer interval */ |
403 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
404 | |
405 | spin_unlock(&pcwd_private.io_lock); |
406 | } else { |
407 | printk(KERN_WARNING PFX |
408 | "Heartbeat lost! Will not ping the watchdog\n"); |
409 | } |
410 | } |
411 | |
412 | static int pcwd_start(void) |
413 | { |
414 | int stat_reg; |
415 | |
416 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
417 | |
418 | /* Start the timer */ |
419 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
420 | |
421 | /* Enable the port */ |
422 | if (pcwd_private.revision == PCWD_REVISION_C) { |
423 | spin_lock(&pcwd_private.io_lock); |
424 | outb_p(0x00, pcwd_private.io_addr + 3); |
425 | udelay(ISA_COMMAND_TIMEOUT); |
426 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
427 | spin_unlock(&pcwd_private.io_lock); |
428 | if (stat_reg & WD_WDIS) { |
429 | printk(KERN_INFO PFX "Could not start watchdog\n"); |
430 | return -EIO; |
431 | } |
432 | } |
433 | |
434 | if (debug >= VERBOSE) |
435 | printk(KERN_DEBUG PFX "Watchdog started\n"); |
436 | |
437 | return 0; |
438 | } |
439 | |
440 | static int pcwd_stop(void) |
441 | { |
442 | int stat_reg; |
443 | |
444 | /* Stop the timer */ |
445 | del_timer(&pcwd_private.timer); |
446 | |
447 | /* Disable the board */ |
448 | if (pcwd_private.revision == PCWD_REVISION_C) { |
449 | spin_lock(&pcwd_private.io_lock); |
450 | outb_p(0xA5, pcwd_private.io_addr + 3); |
451 | udelay(ISA_COMMAND_TIMEOUT); |
452 | outb_p(0xA5, pcwd_private.io_addr + 3); |
453 | udelay(ISA_COMMAND_TIMEOUT); |
454 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
455 | spin_unlock(&pcwd_private.io_lock); |
456 | if ((stat_reg & WD_WDIS) == 0) { |
457 | printk(KERN_INFO PFX "Could not stop watchdog\n"); |
458 | return -EIO; |
459 | } |
460 | } |
461 | |
462 | if (debug >= VERBOSE) |
463 | printk(KERN_DEBUG PFX "Watchdog stopped\n"); |
464 | |
465 | return 0; |
466 | } |
467 | |
468 | static int pcwd_keepalive(void) |
469 | { |
470 | /* user land ping */ |
471 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
472 | |
473 | if (debug >= DEBUG) |
474 | printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n"); |
475 | |
476 | return 0; |
477 | } |
478 | |
479 | static int pcwd_set_heartbeat(int t) |
480 | { |
481 | if (t < 2 || t > 7200) /* arbitrary upper limit */ |
482 | return -EINVAL; |
483 | |
484 | heartbeat = t; |
485 | |
486 | if (debug >= VERBOSE) |
487 | printk(KERN_DEBUG PFX "New heartbeat: %d\n", |
488 | heartbeat); |
489 | |
490 | return 0; |
491 | } |
492 | |
493 | static int pcwd_get_status(int *status) |
494 | { |
495 | int control_status; |
496 | |
497 | *status = 0; |
498 | spin_lock(&pcwd_private.io_lock); |
499 | if (pcwd_private.revision == PCWD_REVISION_A) |
500 | /* Rev A cards return status information from |
501 | * the base register, which is used for the |
502 | * temperature in other cards. */ |
503 | control_status = inb(pcwd_private.io_addr); |
504 | else { |
505 | /* Rev C cards return card status in the base |
506 | * address + 1 register. And use different bits |
507 | * to indicate a card initiated reset, and an |
508 | * over-temperature condition. And the reboot |
509 | * status can be reset. */ |
510 | control_status = inb(pcwd_private.io_addr + 1); |
511 | } |
512 | spin_unlock(&pcwd_private.io_lock); |
513 | |
514 | if (pcwd_private.revision == PCWD_REVISION_A) { |
515 | if (control_status & WD_WDRST) |
516 | *status |= WDIOF_CARDRESET; |
517 | |
518 | if (control_status & WD_T110) { |
519 | *status |= WDIOF_OVERHEAT; |
520 | if (temp_panic) { |
521 | printk(KERN_INFO PFX |
522 | "Temperature overheat trip!\n"); |
523 | kernel_power_off(); |
524 | } |
525 | } |
526 | } else { |
527 | if (control_status & WD_REVC_WTRP) |
528 | *status |= WDIOF_CARDRESET; |
529 | |
530 | if (control_status & WD_REVC_TTRP) { |
531 | *status |= WDIOF_OVERHEAT; |
532 | if (temp_panic) { |
533 | printk(KERN_INFO PFX |
534 | "Temperature overheat trip!\n"); |
535 | kernel_power_off(); |
536 | } |
537 | } |
538 | } |
539 | |
540 | return 0; |
541 | } |
542 | |
543 | static int pcwd_clear_status(void) |
544 | { |
545 | int control_status; |
546 | |
547 | if (pcwd_private.revision == PCWD_REVISION_C) { |
548 | spin_lock(&pcwd_private.io_lock); |
549 | |
550 | if (debug >= VERBOSE) |
551 | printk(KERN_INFO PFX |
552 | "clearing watchdog trip status\n"); |
553 | |
554 | control_status = inb_p(pcwd_private.io_addr + 1); |
555 | |
556 | if (debug >= DEBUG) { |
557 | printk(KERN_DEBUG PFX "status was: 0x%02x\n", |
558 | control_status); |
559 | printk(KERN_DEBUG PFX "sending: 0x%02x\n", |
560 | (control_status & WD_REVC_R2DS)); |
561 | } |
562 | |
563 | /* clear reset status & Keep Relay 2 disable state as it is */ |
564 | outb_p((control_status & WD_REVC_R2DS), |
565 | pcwd_private.io_addr + 1); |
566 | |
567 | spin_unlock(&pcwd_private.io_lock); |
568 | } |
569 | return 0; |
570 | } |
571 | |
572 | static int pcwd_get_temperature(int *temperature) |
573 | { |
574 | /* check that port 0 gives temperature info and no command results */ |
575 | if (pcwd_private.command_mode) |
576 | return -1; |
577 | |
578 | *temperature = 0; |
579 | if (!pcwd_private.supports_temp) |
580 | return -ENODEV; |
581 | |
582 | /* |
583 | * Convert celsius to fahrenheit, since this was |
584 | * the decided 'standard' for this return value. |
585 | */ |
586 | spin_lock(&pcwd_private.io_lock); |
587 | *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; |
588 | spin_unlock(&pcwd_private.io_lock); |
589 | |
590 | if (debug >= DEBUG) { |
591 | printk(KERN_DEBUG PFX "temperature is: %d F\n", |
592 | *temperature); |
593 | } |
594 | |
595 | return 0; |
596 | } |
597 | |
598 | /* |
599 | * /dev/watchdog handling |
600 | */ |
601 | |
602 | static long pcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
603 | { |
604 | int rv; |
605 | int status; |
606 | int temperature; |
607 | int new_heartbeat; |
608 | int __user *argp = (int __user *)arg; |
609 | static const struct watchdog_info ident = { |
610 | .options = WDIOF_OVERHEAT | |
611 | WDIOF_CARDRESET | |
612 | WDIOF_KEEPALIVEPING | |
613 | WDIOF_SETTIMEOUT | |
614 | WDIOF_MAGICCLOSE, |
615 | .firmware_version = 1, |
616 | .identity = "PCWD", |
617 | }; |
618 | |
619 | switch (cmd) { |
620 | case WDIOC_GETSUPPORT: |
621 | if (copy_to_user(argp, &ident, sizeof(ident))) |
622 | return -EFAULT; |
623 | return 0; |
624 | |
625 | case WDIOC_GETSTATUS: |
626 | pcwd_get_status(&status); |
627 | return put_user(status, argp); |
628 | |
629 | case WDIOC_GETBOOTSTATUS: |
630 | return put_user(pcwd_private.boot_status, argp); |
631 | |
632 | case WDIOC_GETTEMP: |
633 | if (pcwd_get_temperature(&temperature)) |
634 | return -EFAULT; |
635 | |
636 | return put_user(temperature, argp); |
637 | |
638 | case WDIOC_SETOPTIONS: |
639 | if (pcwd_private.revision == PCWD_REVISION_C) { |
640 | if (get_user(rv, argp)) |
641 | return -EFAULT; |
642 | |
643 | if (rv & WDIOS_DISABLECARD) { |
644 | status = pcwd_stop(); |
645 | if (status < 0) |
646 | return status; |
647 | } |
648 | if (rv & WDIOS_ENABLECARD) { |
649 | status = pcwd_start(); |
650 | if (status < 0) |
651 | return status; |
652 | } |
653 | if (rv & WDIOS_TEMPPANIC) |
654 | temp_panic = 1; |
655 | } |
656 | return -EINVAL; |
657 | |
658 | case WDIOC_KEEPALIVE: |
659 | pcwd_keepalive(); |
660 | return 0; |
661 | |
662 | case WDIOC_SETTIMEOUT: |
663 | if (get_user(new_heartbeat, argp)) |
664 | return -EFAULT; |
665 | |
666 | if (pcwd_set_heartbeat(new_heartbeat)) |
667 | return -EINVAL; |
668 | |
669 | pcwd_keepalive(); |
670 | /* Fall */ |
671 | |
672 | case WDIOC_GETTIMEOUT: |
673 | return put_user(heartbeat, argp); |
674 | |
675 | default: |
676 | return -ENOTTY; |
677 | } |
678 | |
679 | return 0; |
680 | } |
681 | |
682 | static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, |
683 | loff_t *ppos) |
684 | { |
685 | if (len) { |
686 | if (!nowayout) { |
687 | size_t i; |
688 | |
689 | /* In case it was set long ago */ |
690 | expect_close = 0; |
691 | |
692 | for (i = 0; i != len; i++) { |
693 | char c; |
694 | |
695 | if (get_user(c, buf + i)) |
696 | return -EFAULT; |
697 | if (c == 'V') |
698 | expect_close = 42; |
699 | } |
700 | } |
701 | pcwd_keepalive(); |
702 | } |
703 | return len; |
704 | } |
705 | |
706 | static int pcwd_open(struct inode *inode, struct file *file) |
707 | { |
708 | if (test_and_set_bit(0, &open_allowed)) |
709 | return -EBUSY; |
710 | if (nowayout) |
711 | __module_get(THIS_MODULE); |
712 | /* Activate */ |
713 | pcwd_start(); |
714 | pcwd_keepalive(); |
715 | return nonseekable_open(inode, file); |
716 | } |
717 | |
718 | static int pcwd_close(struct inode *inode, struct file *file) |
719 | { |
720 | if (expect_close == 42) |
721 | pcwd_stop(); |
722 | else { |
723 | printk(KERN_CRIT PFX |
724 | "Unexpected close, not stopping watchdog!\n"); |
725 | pcwd_keepalive(); |
726 | } |
727 | expect_close = 0; |
728 | clear_bit(0, &open_allowed); |
729 | return 0; |
730 | } |
731 | |
732 | /* |
733 | * /dev/temperature handling |
734 | */ |
735 | |
736 | static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, |
737 | loff_t *ppos) |
738 | { |
739 | int temperature; |
740 | |
741 | if (pcwd_get_temperature(&temperature)) |
742 | return -EFAULT; |
743 | |
744 | if (copy_to_user(buf, &temperature, 1)) |
745 | return -EFAULT; |
746 | |
747 | return 1; |
748 | } |
749 | |
750 | static int pcwd_temp_open(struct inode *inode, struct file *file) |
751 | { |
752 | if (!pcwd_private.supports_temp) |
753 | return -ENODEV; |
754 | |
755 | return nonseekable_open(inode, file); |
756 | } |
757 | |
758 | static int pcwd_temp_close(struct inode *inode, struct file *file) |
759 | { |
760 | return 0; |
761 | } |
762 | |
763 | /* |
764 | * Kernel Interfaces |
765 | */ |
766 | |
767 | static const struct file_operations pcwd_fops = { |
768 | .owner = THIS_MODULE, |
769 | .llseek = no_llseek, |
770 | .write = pcwd_write, |
771 | .unlocked_ioctl = pcwd_ioctl, |
772 | .open = pcwd_open, |
773 | .release = pcwd_close, |
774 | }; |
775 | |
776 | static struct miscdevice pcwd_miscdev = { |
777 | .minor = WATCHDOG_MINOR, |
778 | .name = "watchdog", |
779 | .fops = &pcwd_fops, |
780 | }; |
781 | |
782 | static const struct file_operations pcwd_temp_fops = { |
783 | .owner = THIS_MODULE, |
784 | .llseek = no_llseek, |
785 | .read = pcwd_temp_read, |
786 | .open = pcwd_temp_open, |
787 | .release = pcwd_temp_close, |
788 | }; |
789 | |
790 | static struct miscdevice temp_miscdev = { |
791 | .minor = TEMP_MINOR, |
792 | .name = "temperature", |
793 | .fops = &pcwd_temp_fops, |
794 | }; |
795 | |
796 | /* |
797 | * Init & exit routines |
798 | */ |
799 | |
800 | static inline int get_revision(void) |
801 | { |
802 | int r = PCWD_REVISION_C; |
803 | |
804 | spin_lock(&pcwd_private.io_lock); |
805 | /* REV A cards use only 2 io ports; test |
806 | * presumes a floating bus reads as 0xff. */ |
807 | if ((inb(pcwd_private.io_addr + 2) == 0xFF) || |
808 | (inb(pcwd_private.io_addr + 3) == 0xFF)) |
809 | r = PCWD_REVISION_A; |
810 | spin_unlock(&pcwd_private.io_lock); |
811 | |
812 | return r; |
813 | } |
814 | |
815 | /* |
816 | * The ISA cards have a heartbeat bit in one of the registers, which |
817 | * register is card dependent. The heartbeat bit is monitored, and if |
818 | * found, is considered proof that a Berkshire card has been found. |
819 | * The initial rate is once per second at board start up, then twice |
820 | * per second for normal operation. |
821 | */ |
822 | static int __devinit pcwd_isa_match(struct device *dev, unsigned int id) |
823 | { |
824 | int base_addr = pcwd_ioports[id]; |
825 | int port0, last_port0; /* Reg 0, in case it's REV A */ |
826 | int port1, last_port1; /* Register 1 for REV C cards */ |
827 | int i; |
828 | int retval; |
829 | |
830 | if (debug >= DEBUG) |
831 | printk(KERN_DEBUG PFX "pcwd_isa_match id=%d\n", |
832 | id); |
833 | |
834 | if (!request_region(base_addr, 4, "PCWD")) { |
835 | printk(KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr); |
836 | return 0; |
837 | } |
838 | |
839 | retval = 0; |
840 | |
841 | port0 = inb_p(base_addr); /* For REV A boards */ |
842 | port1 = inb_p(base_addr + 1); /* For REV C boards */ |
843 | if (port0 != 0xff || port1 != 0xff) { |
844 | /* Not an 'ff' from a floating bus, so must be a card! */ |
845 | for (i = 0; i < 4; ++i) { |
846 | |
847 | msleep(500); |
848 | |
849 | last_port0 = port0; |
850 | last_port1 = port1; |
851 | |
852 | port0 = inb_p(base_addr); |
853 | port1 = inb_p(base_addr + 1); |
854 | |
855 | /* Has either hearbeat bit changed? */ |
856 | if ((port0 ^ last_port0) & WD_HRTBT || |
857 | (port1 ^ last_port1) & WD_REVC_HRBT) { |
858 | retval = 1; |
859 | break; |
860 | } |
861 | } |
862 | } |
863 | release_region(base_addr, 4); |
864 | |
865 | return retval; |
866 | } |
867 | |
868 | static int __devinit pcwd_isa_probe(struct device *dev, unsigned int id) |
869 | { |
870 | int ret; |
871 | |
872 | if (debug >= DEBUG) |
873 | printk(KERN_DEBUG PFX "pcwd_isa_probe id=%d\n", |
874 | id); |
875 | |
876 | cards_found++; |
877 | if (cards_found == 1) |
878 | printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", |
879 | WATCHDOG_VERSION); |
880 | |
881 | if (cards_found > 1) { |
882 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); |
883 | return -ENODEV; |
884 | } |
885 | |
886 | if (pcwd_ioports[id] == 0x0000) { |
887 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); |
888 | return -ENODEV; |
889 | } |
890 | pcwd_private.io_addr = pcwd_ioports[id]; |
891 | |
892 | spin_lock_init(&pcwd_private.io_lock); |
893 | |
894 | /* Check card's revision */ |
895 | pcwd_private.revision = get_revision(); |
896 | |
897 | if (!request_region(pcwd_private.io_addr, |
898 | (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { |
899 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", |
900 | pcwd_private.io_addr); |
901 | ret = -EIO; |
902 | goto error_request_region; |
903 | } |
904 | |
905 | /* Initial variables */ |
906 | pcwd_private.supports_temp = 0; |
907 | temp_panic = 0; |
908 | pcwd_private.boot_status = 0x0000; |
909 | |
910 | /* get the boot_status */ |
911 | pcwd_get_status(&pcwd_private.boot_status); |
912 | |
913 | /* clear the "card caused reboot" flag */ |
914 | pcwd_clear_status(); |
915 | |
916 | setup_timer(&pcwd_private.timer, pcwd_timer_ping, 0); |
917 | |
918 | /* Disable the board */ |
919 | pcwd_stop(); |
920 | |
921 | /* Check whether or not the card supports the temperature device */ |
922 | pcwd_check_temperature_support(); |
923 | |
924 | /* Show info about the card itself */ |
925 | pcwd_show_card_info(); |
926 | |
927 | /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ |
928 | if (heartbeat == 0) |
929 | heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)]; |
930 | |
931 | /* Check that the heartbeat value is within it's range; |
932 | if not reset to the default */ |
933 | if (pcwd_set_heartbeat(heartbeat)) { |
934 | pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); |
935 | printk(KERN_INFO PFX |
936 | "heartbeat value must be 2 <= heartbeat <= 7200, using %d\n", |
937 | WATCHDOG_HEARTBEAT); |
938 | } |
939 | |
940 | if (pcwd_private.supports_temp) { |
941 | ret = misc_register(&temp_miscdev); |
942 | if (ret) { |
943 | printk(KERN_ERR PFX |
944 | "cannot register miscdev on minor=%d (err=%d)\n", |
945 | TEMP_MINOR, ret); |
946 | goto error_misc_register_temp; |
947 | } |
948 | } |
949 | |
950 | ret = misc_register(&pcwd_miscdev); |
951 | if (ret) { |
952 | printk(KERN_ERR PFX |
953 | "cannot register miscdev on minor=%d (err=%d)\n", |
954 | WATCHDOG_MINOR, ret); |
955 | goto error_misc_register_watchdog; |
956 | } |
957 | |
958 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", |
959 | heartbeat, nowayout); |
960 | |
961 | return 0; |
962 | |
963 | error_misc_register_watchdog: |
964 | if (pcwd_private.supports_temp) |
965 | misc_deregister(&temp_miscdev); |
966 | error_misc_register_temp: |
967 | release_region(pcwd_private.io_addr, |
968 | (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
969 | error_request_region: |
970 | pcwd_private.io_addr = 0x0000; |
971 | cards_found--; |
972 | return ret; |
973 | } |
974 | |
975 | static int __devexit pcwd_isa_remove(struct device *dev, unsigned int id) |
976 | { |
977 | if (debug >= DEBUG) |
978 | printk(KERN_DEBUG PFX "pcwd_isa_remove id=%d\n", |
979 | id); |
980 | |
981 | if (!pcwd_private.io_addr) |
982 | return 1; |
983 | |
984 | /* Disable the board */ |
985 | if (!nowayout) |
986 | pcwd_stop(); |
987 | |
988 | /* Deregister */ |
989 | misc_deregister(&pcwd_miscdev); |
990 | if (pcwd_private.supports_temp) |
991 | misc_deregister(&temp_miscdev); |
992 | release_region(pcwd_private.io_addr, |
993 | (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
994 | pcwd_private.io_addr = 0x0000; |
995 | cards_found--; |
996 | |
997 | return 0; |
998 | } |
999 | |
1000 | static void pcwd_isa_shutdown(struct device *dev, unsigned int id) |
1001 | { |
1002 | if (debug >= DEBUG) |
1003 | printk(KERN_DEBUG PFX "pcwd_isa_shutdown id=%d\n", |
1004 | id); |
1005 | |
1006 | pcwd_stop(); |
1007 | } |
1008 | |
1009 | static struct isa_driver pcwd_isa_driver = { |
1010 | .match = pcwd_isa_match, |
1011 | .probe = pcwd_isa_probe, |
1012 | .remove = __devexit_p(pcwd_isa_remove), |
1013 | .shutdown = pcwd_isa_shutdown, |
1014 | .driver = { |
1015 | .owner = THIS_MODULE, |
1016 | .name = WATCHDOG_NAME, |
1017 | }, |
1018 | }; |
1019 | |
1020 | static int __init pcwd_init_module(void) |
1021 | { |
1022 | return isa_register_driver(&pcwd_isa_driver, PCWD_ISA_NR_CARDS); |
1023 | } |
1024 | |
1025 | static void __exit pcwd_cleanup_module(void) |
1026 | { |
1027 | isa_unregister_driver(&pcwd_isa_driver); |
1028 | printk(KERN_INFO PFX "Watchdog Module Unloaded.\n"); |
1029 | } |
1030 | |
1031 | module_init(pcwd_init_module); |
1032 | module_exit(pcwd_cleanup_module); |
1033 | |
1034 | MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>, " |
1035 | "Wim Van Sebroeck <wim@iguana.be>"); |
1036 | MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); |
1037 | MODULE_VERSION(WATCHDOG_VERSION); |
1038 | MODULE_LICENSE("GPL"); |
1039 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
1040 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |
1041 |
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