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Commit | Line | Data |
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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> /* For module specific items */ | |
53 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
54 | #include <linux/types.h> /* For standard types (like size_t) */ | |
55 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
56 | #include <linux/kernel.h> /* For printk/panic/... */ | |
57 | #include <linux/delay.h> /* For mdelay function */ | |
58 | #include <linux/timer.h> /* For timer related operations */ | |
59 | #include <linux/jiffies.h> /* For jiffies stuff */ | |
60 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ | |
61 | #include <linux/watchdog.h> /* For the watchdog specific items */ | |
62 | #include <linux/notifier.h> /* For notifier support */ | |
63 | #include <linux/reboot.h> /* For reboot_notifier stuff */ | |
64 | #include <linux/init.h> /* For __init/__exit/... */ | |
65 | #include <linux/fs.h> /* For file operations */ | |
66 | #include <linux/ioport.h> /* For io-port access */ | |
67 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ | |
68 | ||
69 | #include <asm/uaccess.h> /* For copy_to_user/put_user/... */ | |
70 | #include <asm/io.h> /* For inb/outb/... */ | |
71 | ||
72 | /* Module and version information */ | |
73 | #define WATCHDOG_VERSION "1.17" | |
74 | #define WATCHDOG_DATE "12 Feb 2006" | |
75 | #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog" | |
76 | #define WATCHDOG_NAME "pcwd" | |
77 | #define PFX WATCHDOG_NAME ": " | |
78 | #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n" | |
79 | #define WD_VER WATCHDOG_VERSION " (" WATCHDOG_DATE ")" | |
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 defines that describe the control status bits for the | |
93 | * PCI-PC Watchdog card. | |
94 | */ | |
95 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */ | |
96 | #define WD_WDRST 0x01 /* Previously reset state */ | |
97 | #define WD_T110 0x02 /* Temperature overheat sense */ | |
98 | #define WD_HRTBT 0x04 /* Heartbeat sense */ | |
99 | #define WD_RLY2 0x08 /* External relay triggered */ | |
100 | #define WD_SRLY2 0x80 /* Software external relay triggered */ | |
101 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */ | |
102 | #define WD_REVC_WTRP 0x01 /* Watchdog Trip status */ | |
103 | #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */ | |
104 | #define WD_REVC_TTRP 0x04 /* Temperature Trip status */ | |
105 | #define WD_REVC_RL2A 0x08 /* Relay 2 activated by on-board processor */ | |
106 | #define WD_REVC_RL1A 0x10 /* Relay 1 active */ | |
107 | #define WD_REVC_R2DS 0x40 /* Relay 2 disable */ | |
108 | #define WD_REVC_RLY2 0x80 /* Relay 2 activated? */ | |
109 | /* Port 2 : Control Status #2 */ | |
110 | #define WD_WDIS 0x10 /* Watchdog Disabled */ | |
111 | #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */ | |
112 | #define WD_SSEL 0x40 /* Watchdog Switch Select (1:SW1 <-> 0:SW2) */ | |
113 | #define WD_WCMD 0x80 /* Watchdog Command Mode */ | |
114 | ||
115 | /* max. time we give an ISA watchdog card to process a command */ | |
116 | /* 500ms for each 4 bit response (according to spec.) */ | |
117 | #define ISA_COMMAND_TIMEOUT 1000 | |
118 | ||
119 | /* Watchdog's internal commands */ | |
120 | #define CMD_ISA_IDLE 0x00 | |
121 | #define CMD_ISA_VERSION_INTEGER 0x01 | |
122 | #define CMD_ISA_VERSION_TENTH 0x02 | |
123 | #define CMD_ISA_VERSION_HUNDRETH 0x03 | |
124 | #define CMD_ISA_VERSION_MINOR 0x04 | |
125 | #define CMD_ISA_SWITCH_SETTINGS 0x05 | |
126 | #define CMD_ISA_RESET_PC 0x06 | |
127 | #define CMD_ISA_ARM_0 0x07 | |
128 | #define CMD_ISA_ARM_30 0x08 | |
129 | #define CMD_ISA_ARM_60 0x09 | |
130 | #define CMD_ISA_DELAY_TIME_2SECS 0x0A | |
131 | #define CMD_ISA_DELAY_TIME_4SECS 0x0B | |
132 | #define CMD_ISA_DELAY_TIME_8SECS 0x0C | |
133 | #define CMD_ISA_RESET_RELAYS 0x0D | |
134 | ||
135 | /* | |
136 | * We are using an kernel timer to do the pinging of the watchdog | |
137 | * every ~500ms. We try to set the internal heartbeat of the | |
138 | * watchdog to 2 ms. | |
139 | */ | |
140 | ||
141 | #define WDT_INTERVAL (HZ/2+1) | |
142 | ||
143 | /* We can only use 1 card due to the /dev/watchdog restriction */ | |
144 | static int cards_found; | |
145 | ||
146 | /* internal variables */ | |
147 | static atomic_t open_allowed = ATOMIC_INIT(1); | |
148 | static char expect_close; | |
149 | static int temp_panic; | |
150 | static struct { /* this is private data for each ISA-PC watchdog card */ | |
151 | char fw_ver_str[6]; /* The cards firmware version */ | |
152 | int revision; /* The card's revision */ | |
153 | int supports_temp; /* Wether or not the card has a temperature device */ | |
154 | int command_mode; /* Wether or not the card is in command mode */ | |
155 | int boot_status; /* The card's boot status */ | |
156 | int io_addr; /* The cards I/O address */ | |
157 | spinlock_t io_lock; /* the lock for io operations */ | |
158 | struct timer_list timer; /* The timer that pings the watchdog */ | |
159 | unsigned long next_heartbeat; /* the next_heartbeat for the timer */ | |
160 | } pcwd_private; | |
161 | ||
162 | /* module parameters */ | |
163 | #define QUIET 0 /* Default */ | |
164 | #define VERBOSE 1 /* Verbose */ | |
165 | #define DEBUG 2 /* print fancy stuff too */ | |
166 | static int debug = QUIET; | |
167 | module_param(debug, int, 0); | |
168 | MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); | |
169 | ||
170 | #define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat */ | |
171 | static int heartbeat = WATCHDOG_HEARTBEAT; | |
172 | module_param(heartbeat, int, 0); | |
173 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); | |
174 | ||
175 | static int nowayout = WATCHDOG_NOWAYOUT; | |
176 | module_param(nowayout, int, 0); | |
177 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
178 | ||
179 | /* | |
180 | * Internal functions | |
181 | */ | |
182 | ||
183 | static int send_isa_command(int cmd) | |
184 | { | |
185 | int i; | |
186 | int control_status; | |
187 | int port0, last_port0; /* Double read for stabilising */ | |
188 | ||
189 | if (debug >= DEBUG) | |
190 | printk(KERN_DEBUG PFX "sending following data cmd=0x%02x\n", | |
191 | cmd); | |
192 | ||
193 | /* The WCMD bit must be 1 and the command is only 4 bits in size */ | |
194 | control_status = (cmd & 0x0F) | WD_WCMD; | |
195 | outb_p(control_status, pcwd_private.io_addr + 2); | |
196 | udelay(ISA_COMMAND_TIMEOUT); | |
197 | ||
198 | port0 = inb_p(pcwd_private.io_addr); | |
199 | for (i = 0; i < 25; ++i) { | |
200 | last_port0 = port0; | |
201 | port0 = inb_p(pcwd_private.io_addr); | |
202 | ||
203 | if (port0 == last_port0) | |
204 | break; /* Data is stable */ | |
205 | ||
206 | udelay (250); | |
207 | } | |
208 | ||
209 | if (debug >= DEBUG) | |
210 | printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n", | |
211 | cmd, port0, last_port0); | |
212 | ||
213 | return port0; | |
214 | } | |
215 | ||
216 | static int set_command_mode(void) | |
217 | { | |
218 | int i, found=0, count=0; | |
219 | ||
220 | /* Set the card into command mode */ | |
221 | spin_lock(&pcwd_private.io_lock); | |
222 | while ((!found) && (count < 3)) { | |
223 | i = send_isa_command(CMD_ISA_IDLE); | |
224 | ||
225 | if (i == 0x00) | |
226 | found = 1; | |
227 | else if (i == 0xF3) { | |
228 | /* Card does not like what we've done to it */ | |
229 | outb_p(0x00, pcwd_private.io_addr + 2); | |
230 | udelay(1200); /* Spec says wait 1ms */ | |
231 | outb_p(0x00, pcwd_private.io_addr + 2); | |
232 | udelay(ISA_COMMAND_TIMEOUT); | |
233 | } | |
234 | count++; | |
235 | } | |
236 | spin_unlock(&pcwd_private.io_lock); | |
237 | pcwd_private.command_mode = found; | |
238 | ||
239 | if (debug >= DEBUG) | |
240 | printk(KERN_DEBUG PFX "command_mode=%d\n", | |
241 | pcwd_private.command_mode); | |
242 | ||
243 | return(found); | |
244 | } | |
245 | ||
246 | static void unset_command_mode(void) | |
247 | { | |
248 | /* Set the card into normal mode */ | |
249 | spin_lock(&pcwd_private.io_lock); | |
250 | outb_p(0x00, pcwd_private.io_addr + 2); | |
251 | udelay(ISA_COMMAND_TIMEOUT); | |
252 | spin_unlock(&pcwd_private.io_lock); | |
253 | ||
254 | pcwd_private.command_mode = 0; | |
255 | ||
256 | if (debug >= DEBUG) | |
257 | printk(KERN_DEBUG PFX "command_mode=%d\n", | |
258 | pcwd_private.command_mode); | |
259 | } | |
260 | ||
261 | static inline void pcwd_check_temperature_support(void) | |
262 | { | |
263 | if (inb(pcwd_private.io_addr) != 0xF0) | |
264 | pcwd_private.supports_temp = 1; | |
265 | } | |
266 | ||
267 | static inline void pcwd_get_firmware(void) | |
268 | { | |
269 | int one, ten, hund, minor; | |
270 | ||
271 | strcpy(pcwd_private.fw_ver_str, "ERROR"); | |
272 | ||
273 | if (set_command_mode()) { | |
274 | one = send_isa_command(CMD_ISA_VERSION_INTEGER); | |
275 | ten = send_isa_command(CMD_ISA_VERSION_TENTH); | |
276 | hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH); | |
277 | minor = send_isa_command(CMD_ISA_VERSION_MINOR); | |
278 | sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", one, ten, hund, minor); | |
279 | } | |
280 | unset_command_mode(); | |
281 | ||
282 | return; | |
283 | } | |
284 | ||
285 | static inline int pcwd_get_option_switches(void) | |
286 | { | |
287 | int option_switches=0; | |
288 | ||
289 | if (set_command_mode()) { | |
290 | /* Get switch settings */ | |
291 | option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS); | |
292 | } | |
293 | ||
294 | unset_command_mode(); | |
295 | return(option_switches); | |
296 | } | |
297 | ||
298 | static void pcwd_show_card_info(void) | |
299 | { | |
300 | int option_switches; | |
301 | ||
302 | /* Get some extra info from the hardware (in command/debug/diag mode) */ | |
303 | if (pcwd_private.revision == PCWD_REVISION_A) | |
304 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", pcwd_private.io_addr); | |
305 | else if (pcwd_private.revision == PCWD_REVISION_C) { | |
306 | pcwd_get_firmware(); | |
307 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n", | |
308 | pcwd_private.io_addr, pcwd_private.fw_ver_str); | |
309 | option_switches = pcwd_get_option_switches(); | |
310 | printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", | |
311 | option_switches, | |
312 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
313 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
314 | ||
315 | /* Reprogram internal heartbeat to 2 seconds */ | |
316 | if (set_command_mode()) { | |
317 | send_isa_command(CMD_ISA_DELAY_TIME_2SECS); | |
318 | unset_command_mode(); | |
319 | } | |
320 | } | |
321 | ||
322 | if (pcwd_private.supports_temp) | |
323 | printk(KERN_INFO PFX "Temperature Option Detected\n"); | |
324 | ||
325 | if (pcwd_private.boot_status & WDIOF_CARDRESET) | |
326 | printk(KERN_INFO PFX "Previous reboot was caused by the card\n"); | |
327 | ||
328 | if (pcwd_private.boot_status & WDIOF_OVERHEAT) { | |
329 | printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n"); | |
330 | printk(KERN_EMERG PFX "CPU Overheat\n"); | |
331 | } | |
332 | ||
333 | if (pcwd_private.boot_status == 0) | |
334 | printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n"); | |
335 | } | |
336 | ||
337 | static void pcwd_timer_ping(unsigned long data) | |
338 | { | |
339 | int wdrst_stat; | |
340 | ||
341 | /* If we got a heartbeat pulse within the WDT_INTERVAL | |
342 | * we agree to ping the WDT */ | |
343 | if(time_before(jiffies, pcwd_private.next_heartbeat)) { | |
344 | /* Ping the watchdog */ | |
345 | spin_lock(&pcwd_private.io_lock); | |
346 | if (pcwd_private.revision == PCWD_REVISION_A) { | |
347 | /* Rev A cards are reset by setting the WD_WDRST bit in register 1 */ | |
348 | wdrst_stat = inb_p(pcwd_private.io_addr); | |
349 | wdrst_stat &= 0x0F; | |
350 | wdrst_stat |= WD_WDRST; | |
351 | ||
352 | outb_p(wdrst_stat, pcwd_private.io_addr + 1); | |
353 | } else { | |
354 | /* Re-trigger watchdog by writing to port 0 */ | |
355 | outb_p(0x00, pcwd_private.io_addr); | |
356 | } | |
357 | ||
358 | /* Re-set the timer interval */ | |
359 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); | |
360 | ||
361 | spin_unlock(&pcwd_private.io_lock); | |
362 | } else { | |
363 | printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n"); | |
364 | } | |
365 | } | |
366 | ||
367 | static int pcwd_start(void) | |
368 | { | |
369 | int stat_reg; | |
370 | ||
371 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); | |
372 | ||
373 | /* Start the timer */ | |
374 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); | |
375 | ||
376 | /* Enable the port */ | |
377 | if (pcwd_private.revision == PCWD_REVISION_C) { | |
378 | spin_lock(&pcwd_private.io_lock); | |
379 | outb_p(0x00, pcwd_private.io_addr + 3); | |
380 | udelay(ISA_COMMAND_TIMEOUT); | |
381 | stat_reg = inb_p(pcwd_private.io_addr + 2); | |
382 | spin_unlock(&pcwd_private.io_lock); | |
383 | if (stat_reg & WD_WDIS) { | |
384 | printk(KERN_INFO PFX "Could not start watchdog\n"); | |
385 | return -EIO; | |
386 | } | |
387 | } | |
388 | ||
389 | if (debug >= VERBOSE) | |
390 | printk(KERN_DEBUG PFX "Watchdog started\n"); | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
395 | static int pcwd_stop(void) | |
396 | { | |
397 | int stat_reg; | |
398 | ||
399 | /* Stop the timer */ | |
400 | del_timer(&pcwd_private.timer); | |
401 | ||
402 | /* Disable the board */ | |
403 | if (pcwd_private.revision == PCWD_REVISION_C) { | |
404 | spin_lock(&pcwd_private.io_lock); | |
405 | outb_p(0xA5, pcwd_private.io_addr + 3); | |
406 | udelay(ISA_COMMAND_TIMEOUT); | |
407 | outb_p(0xA5, pcwd_private.io_addr + 3); | |
408 | udelay(ISA_COMMAND_TIMEOUT); | |
409 | stat_reg = inb_p(pcwd_private.io_addr + 2); | |
410 | spin_unlock(&pcwd_private.io_lock); | |
411 | if ((stat_reg & WD_WDIS) == 0) { | |
412 | printk(KERN_INFO PFX "Could not stop watchdog\n"); | |
413 | return -EIO; | |
414 | } | |
415 | } | |
416 | ||
417 | if (debug >= VERBOSE) | |
418 | printk(KERN_DEBUG PFX "Watchdog stopped\n"); | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
423 | static int pcwd_keepalive(void) | |
424 | { | |
425 | /* user land ping */ | |
426 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); | |
427 | ||
428 | if (debug >= DEBUG) | |
429 | printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n"); | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | static int pcwd_set_heartbeat(int t) | |
435 | { | |
436 | if ((t < 2) || (t > 7200)) /* arbitrary upper limit */ | |
437 | return -EINVAL; | |
438 | ||
439 | heartbeat = t; | |
440 | ||
441 | if (debug >= VERBOSE) | |
442 | printk(KERN_DEBUG PFX "New heartbeat: %d\n", | |
443 | heartbeat); | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | static int pcwd_get_status(int *status) | |
449 | { | |
450 | int control_status; | |
451 | ||
452 | *status=0; | |
453 | spin_lock(&pcwd_private.io_lock); | |
454 | if (pcwd_private.revision == PCWD_REVISION_A) | |
455 | /* Rev A cards return status information from | |
456 | * the base register, which is used for the | |
457 | * temperature in other cards. */ | |
458 | control_status = inb(pcwd_private.io_addr); | |
459 | else { | |
460 | /* Rev C cards return card status in the base | |
461 | * address + 1 register. And use different bits | |
462 | * to indicate a card initiated reset, and an | |
463 | * over-temperature condition. And the reboot | |
464 | * status can be reset. */ | |
465 | control_status = inb(pcwd_private.io_addr + 1); | |
466 | } | |
467 | spin_unlock(&pcwd_private.io_lock); | |
468 | ||
469 | if (pcwd_private.revision == PCWD_REVISION_A) { | |
470 | if (control_status & WD_WDRST) | |
471 | *status |= WDIOF_CARDRESET; | |
472 | ||
473 | if (control_status & WD_T110) { | |
474 | *status |= WDIOF_OVERHEAT; | |
475 | if (temp_panic) { | |
476 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
477 | kernel_power_off(); | |
478 | /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */ | |
479 | } | |
480 | } | |
481 | } else { | |
482 | if (control_status & WD_REVC_WTRP) | |
483 | *status |= WDIOF_CARDRESET; | |
484 | ||
485 | if (control_status & WD_REVC_TTRP) { | |
486 | *status |= WDIOF_OVERHEAT; | |
487 | if (temp_panic) { | |
488 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
489 | kernel_power_off(); | |
490 | /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */ | |
491 | } | |
492 | } | |
493 | } | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | static int pcwd_clear_status(void) | |
499 | { | |
500 | int control_status; | |
501 | ||
502 | if (pcwd_private.revision == PCWD_REVISION_C) { | |
503 | spin_lock(&pcwd_private.io_lock); | |
504 | ||
505 | if (debug >= VERBOSE) | |
506 | printk(KERN_INFO PFX "clearing watchdog trip status\n"); | |
507 | ||
508 | control_status = inb_p(pcwd_private.io_addr + 1); | |
509 | ||
510 | if (debug >= DEBUG) { | |
511 | printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status); | |
512 | printk(KERN_DEBUG PFX "sending: 0x%02x\n", | |
513 | (control_status & WD_REVC_R2DS)); | |
514 | } | |
515 | ||
516 | /* clear reset status & Keep Relay 2 disable state as it is */ | |
517 | outb_p((control_status & WD_REVC_R2DS), pcwd_private.io_addr + 1); | |
518 | ||
519 | spin_unlock(&pcwd_private.io_lock); | |
520 | } | |
521 | return 0; | |
522 | } | |
523 | ||
524 | static int pcwd_get_temperature(int *temperature) | |
525 | { | |
526 | /* check that port 0 gives temperature info and no command results */ | |
527 | if (pcwd_private.command_mode) | |
528 | return -1; | |
529 | ||
530 | *temperature = 0; | |
531 | if (!pcwd_private.supports_temp) | |
532 | return -ENODEV; | |
533 | ||
534 | /* | |
535 | * Convert celsius to fahrenheit, since this was | |
536 | * the decided 'standard' for this return value. | |
537 | */ | |
538 | spin_lock(&pcwd_private.io_lock); | |
539 | *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; | |
540 | spin_unlock(&pcwd_private.io_lock); | |
541 | ||
542 | if (debug >= DEBUG) { | |
543 | printk(KERN_DEBUG PFX "temperature is: %d F\n", | |
544 | *temperature); | |
545 | } | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | /* | |
551 | * /dev/watchdog handling | |
552 | */ | |
553 | ||
554 | static int pcwd_ioctl(struct inode *inode, struct file *file, | |
555 | unsigned int cmd, unsigned long arg) | |
556 | { | |
557 | int rv; | |
558 | int status; | |
559 | int temperature; | |
560 | int new_heartbeat; | |
561 | int __user *argp = (int __user *)arg; | |
562 | static struct watchdog_info ident = { | |
563 | .options = WDIOF_OVERHEAT | | |
564 | WDIOF_CARDRESET | | |
565 | WDIOF_KEEPALIVEPING | | |
566 | WDIOF_SETTIMEOUT | | |
567 | WDIOF_MAGICCLOSE, | |
568 | .firmware_version = 1, | |
569 | .identity = "PCWD", | |
570 | }; | |
571 | ||
572 | switch(cmd) { | |
573 | default: | |
574 | return -ENOTTY; | |
575 | ||
576 | case WDIOC_GETSUPPORT: | |
577 | if(copy_to_user(argp, &ident, sizeof(ident))) | |
578 | return -EFAULT; | |
579 | return 0; | |
580 | ||
581 | case WDIOC_GETSTATUS: | |
582 | pcwd_get_status(&status); | |
583 | return put_user(status, argp); | |
584 | ||
585 | case WDIOC_GETBOOTSTATUS: | |
586 | return put_user(pcwd_private.boot_status, argp); | |
587 | ||
588 | case WDIOC_GETTEMP: | |
589 | if (pcwd_get_temperature(&temperature)) | |
590 | return -EFAULT; | |
591 | ||
592 | return put_user(temperature, argp); | |
593 | ||
594 | case WDIOC_SETOPTIONS: | |
595 | if (pcwd_private.revision == PCWD_REVISION_C) | |
596 | { | |
597 | if(copy_from_user(&rv, argp, sizeof(int))) | |
598 | return -EFAULT; | |
599 | ||
600 | if (rv & WDIOS_DISABLECARD) | |
601 | { | |
602 | return pcwd_stop(); | |
603 | } | |
604 | ||
605 | if (rv & WDIOS_ENABLECARD) | |
606 | { | |
607 | return pcwd_start(); | |
608 | } | |
609 | ||
610 | if (rv & WDIOS_TEMPPANIC) | |
611 | { | |
612 | temp_panic = 1; | |
613 | } | |
614 | } | |
615 | return -EINVAL; | |
616 | ||
617 | case WDIOC_KEEPALIVE: | |
618 | pcwd_keepalive(); | |
619 | return 0; | |
620 | ||
621 | case WDIOC_SETTIMEOUT: | |
622 | if (get_user(new_heartbeat, argp)) | |
623 | return -EFAULT; | |
624 | ||
625 | if (pcwd_set_heartbeat(new_heartbeat)) | |
626 | return -EINVAL; | |
627 | ||
628 | pcwd_keepalive(); | |
629 | /* Fall */ | |
630 | ||
631 | case WDIOC_GETTIMEOUT: | |
632 | return put_user(heartbeat, argp); | |
633 | } | |
634 | ||
635 | return 0; | |
636 | } | |
637 | ||
638 | static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, | |
639 | loff_t *ppos) | |
640 | { | |
641 | if (len) { | |
642 | if (!nowayout) { | |
643 | size_t i; | |
644 | ||
645 | /* In case it was set long ago */ | |
646 | expect_close = 0; | |
647 | ||
648 | for (i = 0; i != len; i++) { | |
649 | char c; | |
650 | ||
651 | if (get_user(c, buf + i)) | |
652 | return -EFAULT; | |
653 | if (c == 'V') | |
654 | expect_close = 42; | |
655 | } | |
656 | } | |
657 | pcwd_keepalive(); | |
658 | } | |
659 | return len; | |
660 | } | |
661 | ||
662 | static int pcwd_open(struct inode *inode, struct file *file) | |
663 | { | |
664 | if (!atomic_dec_and_test(&open_allowed) ) { | |
665 | if (debug >= VERBOSE) | |
666 | printk(KERN_ERR PFX "Attempt to open already opened device.\n"); | |
667 | atomic_inc( &open_allowed ); | |
668 | return -EBUSY; | |
669 | } | |
670 | ||
671 | if (nowayout) | |
672 | __module_get(THIS_MODULE); | |
673 | ||
674 | /* Activate */ | |
675 | pcwd_start(); | |
676 | pcwd_keepalive(); | |
677 | return nonseekable_open(inode, file); | |
678 | } | |
679 | ||
680 | static int pcwd_close(struct inode *inode, struct file *file) | |
681 | { | |
682 | if (expect_close == 42) { | |
683 | pcwd_stop(); | |
684 | } else { | |
685 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); | |
686 | pcwd_keepalive(); | |
687 | } | |
688 | expect_close = 0; | |
689 | atomic_inc( &open_allowed ); | |
690 | return 0; | |
691 | } | |
692 | ||
693 | /* | |
694 | * /dev/temperature handling | |
695 | */ | |
696 | ||
697 | static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, | |
698 | loff_t *ppos) | |
699 | { | |
700 | int temperature; | |
701 | ||
702 | if (pcwd_get_temperature(&temperature)) | |
703 | return -EFAULT; | |
704 | ||
705 | if (copy_to_user(buf, &temperature, 1)) | |
706 | return -EFAULT; | |
707 | ||
708 | return 1; | |
709 | } | |
710 | ||
711 | static int pcwd_temp_open(struct inode *inode, struct file *file) | |
712 | { | |
713 | if (!pcwd_private.supports_temp) | |
714 | return -ENODEV; | |
715 | ||
716 | return nonseekable_open(inode, file); | |
717 | } | |
718 | ||
719 | static int pcwd_temp_close(struct inode *inode, struct file *file) | |
720 | { | |
721 | return 0; | |
722 | } | |
723 | ||
724 | /* | |
725 | * Notify system | |
726 | */ | |
727 | ||
728 | static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
729 | { | |
730 | if (code==SYS_DOWN || code==SYS_HALT) { | |
731 | /* Turn the WDT off */ | |
732 | pcwd_stop(); | |
733 | } | |
734 | ||
735 | return NOTIFY_DONE; | |
736 | } | |
737 | ||
738 | /* | |
739 | * Kernel Interfaces | |
740 | */ | |
741 | ||
742 | static const struct file_operations pcwd_fops = { | |
743 | .owner = THIS_MODULE, | |
744 | .llseek = no_llseek, | |
745 | .write = pcwd_write, | |
746 | .ioctl = pcwd_ioctl, | |
747 | .open = pcwd_open, | |
748 | .release = pcwd_close, | |
749 | }; | |
750 | ||
751 | static struct miscdevice pcwd_miscdev = { | |
752 | .minor = WATCHDOG_MINOR, | |
753 | .name = "watchdog", | |
754 | .fops = &pcwd_fops, | |
755 | }; | |
756 | ||
757 | static const struct file_operations pcwd_temp_fops = { | |
758 | .owner = THIS_MODULE, | |
759 | .llseek = no_llseek, | |
760 | .read = pcwd_temp_read, | |
761 | .open = pcwd_temp_open, | |
762 | .release = pcwd_temp_close, | |
763 | }; | |
764 | ||
765 | static struct miscdevice temp_miscdev = { | |
766 | .minor = TEMP_MINOR, | |
767 | .name = "temperature", | |
768 | .fops = &pcwd_temp_fops, | |
769 | }; | |
770 | ||
771 | static struct notifier_block pcwd_notifier = { | |
772 | .notifier_call = pcwd_notify_sys, | |
773 | }; | |
774 | ||
775 | /* | |
776 | * Init & exit routines | |
777 | */ | |
778 | ||
779 | static inline int get_revision(void) | |
780 | { | |
781 | int r = PCWD_REVISION_C; | |
782 | ||
783 | spin_lock(&pcwd_private.io_lock); | |
784 | /* REV A cards use only 2 io ports; test | |
785 | * presumes a floating bus reads as 0xff. */ | |
786 | if ((inb(pcwd_private.io_addr + 2) == 0xFF) || | |
787 | (inb(pcwd_private.io_addr + 3) == 0xFF)) | |
788 | r=PCWD_REVISION_A; | |
789 | spin_unlock(&pcwd_private.io_lock); | |
790 | ||
791 | return r; | |
792 | } | |
793 | ||
794 | static int __devinit pcwatchdog_init(int base_addr) | |
795 | { | |
796 | int ret; | |
797 | ||
798 | cards_found++; | |
799 | if (cards_found == 1) | |
800 | printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER); | |
801 | ||
802 | if (cards_found > 1) { | |
803 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); | |
804 | return -ENODEV; | |
805 | } | |
806 | ||
807 | if (base_addr == 0x0000) { | |
808 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); | |
809 | return -ENODEV; | |
810 | } | |
811 | pcwd_private.io_addr = base_addr; | |
812 | ||
813 | /* Check card's revision */ | |
814 | pcwd_private.revision = get_revision(); | |
815 | ||
816 | if (!request_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { | |
817 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", | |
818 | pcwd_private.io_addr); | |
819 | pcwd_private.io_addr = 0x0000; | |
820 | return -EIO; | |
821 | } | |
822 | ||
823 | /* Initial variables */ | |
824 | pcwd_private.supports_temp = 0; | |
825 | temp_panic = 0; | |
826 | pcwd_private.boot_status = 0x0000; | |
827 | ||
828 | /* get the boot_status */ | |
829 | pcwd_get_status(&pcwd_private.boot_status); | |
830 | ||
831 | /* clear the "card caused reboot" flag */ | |
832 | pcwd_clear_status(); | |
833 | ||
834 | init_timer(&pcwd_private.timer); | |
835 | pcwd_private.timer.function = pcwd_timer_ping; | |
836 | pcwd_private.timer.data = 0; | |
837 | ||
838 | /* Disable the board */ | |
839 | pcwd_stop(); | |
840 | ||
841 | /* Check whether or not the card supports the temperature device */ | |
842 | pcwd_check_temperature_support(); | |
843 | ||
844 | /* Show info about the card itself */ | |
845 | pcwd_show_card_info(); | |
846 | ||
847 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
848 | if (pcwd_set_heartbeat(heartbeat)) { | |
849 | pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); | |
850 | printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n", | |
851 | WATCHDOG_HEARTBEAT); | |
852 | } | |
853 | ||
854 | ret = register_reboot_notifier(&pcwd_notifier); | |
855 | if (ret) { | |
856 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", | |
857 | ret); | |
858 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); | |
859 | pcwd_private.io_addr = 0x0000; | |
860 | return ret; | |
861 | } | |
862 | ||
863 | if (pcwd_private.supports_temp) { | |
864 | ret = misc_register(&temp_miscdev); | |
865 | if (ret) { | |
866 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
867 | TEMP_MINOR, ret); | |
868 | unregister_reboot_notifier(&pcwd_notifier); | |
869 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); | |
870 | pcwd_private.io_addr = 0x0000; | |
871 | return ret; | |
872 | } | |
873 | } | |
874 | ||
875 | ret = misc_register(&pcwd_miscdev); | |
876 | if (ret) { | |
877 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
878 | WATCHDOG_MINOR, ret); | |
879 | if (pcwd_private.supports_temp) | |
880 | misc_deregister(&temp_miscdev); | |
881 | unregister_reboot_notifier(&pcwd_notifier); | |
882 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); | |
883 | pcwd_private.io_addr = 0x0000; | |
884 | return ret; | |
885 | } | |
886 | ||
887 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
888 | heartbeat, nowayout); | |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
893 | static void __devexit pcwatchdog_exit(void) | |
894 | { | |
895 | /* Disable the board */ | |
896 | if (!nowayout) | |
897 | pcwd_stop(); | |
898 | ||
899 | /* Deregister */ | |
900 | misc_deregister(&pcwd_miscdev); | |
901 | if (pcwd_private.supports_temp) | |
902 | misc_deregister(&temp_miscdev); | |
903 | unregister_reboot_notifier(&pcwd_notifier); | |
904 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); | |
905 | pcwd_private.io_addr = 0x0000; | |
906 | cards_found--; | |
907 | } | |
908 | ||
909 | /* | |
910 | * The ISA cards have a heartbeat bit in one of the registers, which | |
911 | * register is card dependent. The heartbeat bit is monitored, and if | |
912 | * found, is considered proof that a Berkshire card has been found. | |
913 | * The initial rate is once per second at board start up, then twice | |
914 | * per second for normal operation. | |
915 | */ | |
916 | static int __init pcwd_checkcard(int base_addr) | |
917 | { | |
918 | int port0, last_port0; /* Reg 0, in case it's REV A */ | |
919 | int port1, last_port1; /* Register 1 for REV C cards */ | |
920 | int i; | |
921 | int retval; | |
922 | ||
923 | if (!request_region (base_addr, 4, "PCWD")) { | |
924 | printk (KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr); | |
925 | return 0; | |
926 | } | |
927 | ||
928 | retval = 0; | |
929 | ||
930 | port0 = inb_p(base_addr); /* For REV A boards */ | |
931 | port1 = inb_p(base_addr + 1); /* For REV C boards */ | |
932 | if (port0 != 0xff || port1 != 0xff) { | |
933 | /* Not an 'ff' from a floating bus, so must be a card! */ | |
934 | for (i = 0; i < 4; ++i) { | |
935 | ||
936 | msleep(500); | |
937 | ||
938 | last_port0 = port0; | |
939 | last_port1 = port1; | |
940 | ||
941 | port0 = inb_p(base_addr); | |
942 | port1 = inb_p(base_addr + 1); | |
943 | ||
944 | /* Has either hearbeat bit changed? */ | |
945 | if ((port0 ^ last_port0) & WD_HRTBT || | |
946 | (port1 ^ last_port1) & WD_REVC_HRBT) { | |
947 | retval = 1; | |
948 | break; | |
949 | } | |
950 | } | |
951 | } | |
952 | release_region (base_addr, 4); | |
953 | ||
954 | return retval; | |
955 | } | |
956 | ||
957 | /* | |
958 | * These are the auto-probe addresses available. | |
959 | * | |
960 | * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350. | |
961 | * Revision A has an address range of 2 addresses, while Revision C has 4. | |
962 | */ | |
963 | static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; | |
964 | ||
965 | static int __init pcwd_init_module(void) | |
966 | { | |
967 | int i, found = 0; | |
968 | ||
969 | spin_lock_init(&pcwd_private.io_lock); | |
970 | ||
971 | for (i = 0; pcwd_ioports[i] != 0; i++) { | |
972 | if (pcwd_checkcard(pcwd_ioports[i])) { | |
973 | if (!(pcwatchdog_init(pcwd_ioports[i]))) | |
974 | found++; | |
975 | } | |
976 | } | |
977 | ||
978 | if (!found) { | |
979 | printk (KERN_INFO PFX "No card detected, or port not available\n"); | |
980 | return -ENODEV; | |
981 | } | |
982 | ||
983 | return 0; | |
984 | } | |
985 | ||
986 | static void __exit pcwd_cleanup_module(void) | |
987 | { | |
988 | if (pcwd_private.io_addr) | |
989 | pcwatchdog_exit(); | |
990 | ||
991 | printk(KERN_INFO PFX "Watchdog Module Unloaded.\n"); | |
992 | } | |
993 | ||
994 | module_init(pcwd_init_module); | |
995 | module_exit(pcwd_cleanup_module); | |
996 | ||
997 | MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>"); | |
998 | MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); | |
999 | MODULE_LICENSE("GPL"); | |
1000 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
1001 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |