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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 */ | |
4206f0c4 WVS |
76 | #define WATCHDOG_VERSION "1.17" |
77 | #define WATCHDOG_DATE "12 Feb 2006" | |
a7122f91 WVS |
78 | #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog" |
79 | #define WATCHDOG_NAME "pcwd" | |
80 | #define PFX WATCHDOG_NAME ": " | |
81 | #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n" | |
82 | #define WD_VER WATCHDOG_VERSION " (" WATCHDOG_DATE ")" | |
1da177e4 LT |
83 | |
84 | /* | |
85 | * It should be noted that PCWD_REVISION_B was removed because A and B | |
86 | * are essentially the same types of card, with the exception that B | |
87 | * has temperature reporting. Since I didn't receive a Rev.B card, | |
88 | * the Rev.B card is not supported. (It's a good thing too, as they | |
89 | * are no longer in production.) | |
90 | */ | |
91 | #define PCWD_REVISION_A 1 | |
92 | #define PCWD_REVISION_C 2 | |
93 | ||
94 | /* | |
8f0235dc WVS |
95 | * These are the defines that describe the control status bits for the |
96 | * PCI-PC Watchdog card. | |
97 | */ | |
98 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */ | |
4206f0c4 WVS |
99 | #define WD_WDRST 0x01 /* Previously reset state */ |
100 | #define WD_T110 0x02 /* Temperature overheat sense */ | |
101 | #define WD_HRTBT 0x04 /* Heartbeat sense */ | |
102 | #define WD_RLY2 0x08 /* External relay triggered */ | |
103 | #define WD_SRLY2 0x80 /* Software external relay triggered */ | |
8f0235dc | 104 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */ |
4206f0c4 WVS |
105 | #define WD_REVC_WTRP 0x01 /* Watchdog Trip status */ |
106 | #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */ | |
107 | #define WD_REVC_TTRP 0x04 /* Temperature Trip status */ | |
108 | #define WD_REVC_RL2A 0x08 /* Relay 2 activated by on-board processor */ | |
109 | #define WD_REVC_RL1A 0x10 /* Relay 1 active */ | |
110 | #define WD_REVC_R2DS 0x40 /* Relay 2 disable */ | |
111 | #define WD_REVC_RLY2 0x80 /* Relay 2 activated? */ | |
8f0235dc WVS |
112 | /* Port 2 : Control Status #2 */ |
113 | #define WD_WDIS 0x10 /* Watchdog Disabled */ | |
114 | #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */ | |
115 | #define WD_SSEL 0x40 /* Watchdog Switch Select (1:SW1 <-> 0:SW2) */ | |
116 | #define WD_WCMD 0x80 /* Watchdog Command Mode */ | |
1da177e4 LT |
117 | |
118 | /* max. time we give an ISA watchdog card to process a command */ | |
119 | /* 500ms for each 4 bit response (according to spec.) */ | |
120 | #define ISA_COMMAND_TIMEOUT 1000 | |
121 | ||
122 | /* Watchdog's internal commands */ | |
fd41fa61 WVS |
123 | #define CMD_ISA_IDLE 0x00 |
124 | #define CMD_ISA_VERSION_INTEGER 0x01 | |
125 | #define CMD_ISA_VERSION_TENTH 0x02 | |
126 | #define CMD_ISA_VERSION_HUNDRETH 0x03 | |
127 | #define CMD_ISA_VERSION_MINOR 0x04 | |
128 | #define CMD_ISA_SWITCH_SETTINGS 0x05 | |
129 | #define CMD_ISA_DELAY_TIME_2SECS 0x0A | |
130 | #define CMD_ISA_DELAY_TIME_4SECS 0x0B | |
131 | #define CMD_ISA_DELAY_TIME_8SECS 0x0C | |
1da177e4 LT |
132 | |
133 | /* | |
134 | * We are using an kernel timer to do the pinging of the watchdog | |
135 | * every ~500ms. We try to set the internal heartbeat of the | |
136 | * watchdog to 2 ms. | |
137 | */ | |
138 | ||
139 | #define WDT_INTERVAL (HZ/2+1) | |
140 | ||
141 | /* We can only use 1 card due to the /dev/watchdog restriction */ | |
142 | static int cards_found; | |
143 | ||
144 | /* internal variables */ | |
145 | static atomic_t open_allowed = ATOMIC_INIT(1); | |
146 | static char expect_close; | |
1da177e4 | 147 | static int temp_panic; |
a2be8786 WVS |
148 | static struct { /* this is private data for each ISA-PC watchdog card */ |
149 | int revision; /* The card's revision */ | |
150 | int supports_temp; /* Wether or not the card has a temperature device */ | |
151 | int command_mode; /* Wether or not the card is in command mode */ | |
152 | int boot_status; /* The card's boot status */ | |
153 | int io_addr; /* The cards I/O address */ | |
154 | spinlock_t io_lock; /* the lock for io operations */ | |
155 | struct timer_list timer; /* The timer that pings the watchdog */ | |
156 | unsigned long next_heartbeat; /* the next_heartbeat for the timer */ | |
157 | } pcwd_private; | |
1da177e4 LT |
158 | |
159 | /* module parameters */ | |
160 | #define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat */ | |
161 | static int heartbeat = WATCHDOG_HEARTBEAT; | |
162 | module_param(heartbeat, int, 0); | |
163 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); | |
164 | ||
4bfdf378 | 165 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 LT |
166 | module_param(nowayout, int, 0); |
167 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
168 | ||
169 | /* | |
170 | * Internal functions | |
171 | */ | |
172 | ||
173 | static int send_isa_command(int cmd) | |
174 | { | |
175 | int i; | |
176 | int control_status; | |
177 | int port0, last_port0; /* Double read for stabilising */ | |
178 | ||
179 | /* The WCMD bit must be 1 and the command is only 4 bits in size */ | |
8f0235dc | 180 | control_status = (cmd & 0x0F) | WD_WCMD; |
a2be8786 | 181 | outb_p(control_status, pcwd_private.io_addr + 2); |
1da177e4 LT |
182 | udelay(ISA_COMMAND_TIMEOUT); |
183 | ||
a2be8786 | 184 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
185 | for (i = 0; i < 25; ++i) { |
186 | last_port0 = port0; | |
a2be8786 | 187 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
188 | |
189 | if (port0 == last_port0) | |
190 | break; /* Data is stable */ | |
191 | ||
192 | udelay (250); | |
193 | } | |
194 | ||
195 | return port0; | |
196 | } | |
197 | ||
198 | static int set_command_mode(void) | |
199 | { | |
200 | int i, found=0, count=0; | |
201 | ||
202 | /* Set the card into command mode */ | |
a2be8786 | 203 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
204 | while ((!found) && (count < 3)) { |
205 | i = send_isa_command(CMD_ISA_IDLE); | |
206 | ||
207 | if (i == 0x00) | |
208 | found = 1; | |
209 | else if (i == 0xF3) { | |
210 | /* Card does not like what we've done to it */ | |
a2be8786 | 211 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 | 212 | udelay(1200); /* Spec says wait 1ms */ |
a2be8786 | 213 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 LT |
214 | udelay(ISA_COMMAND_TIMEOUT); |
215 | } | |
216 | count++; | |
217 | } | |
a2be8786 WVS |
218 | spin_unlock(&pcwd_private.io_lock); |
219 | pcwd_private.command_mode = found; | |
1da177e4 LT |
220 | |
221 | return(found); | |
222 | } | |
223 | ||
224 | static void unset_command_mode(void) | |
225 | { | |
226 | /* Set the card into normal mode */ | |
a2be8786 WVS |
227 | spin_lock(&pcwd_private.io_lock); |
228 | outb_p(0x00, pcwd_private.io_addr + 2); | |
1da177e4 | 229 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 230 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 231 | |
a2be8786 | 232 | pcwd_private.command_mode = 0; |
1da177e4 LT |
233 | } |
234 | ||
85875211 WVS |
235 | static inline void pcwd_check_temperature_support(void) |
236 | { | |
237 | if (inb(pcwd_private.io_addr) != 0xF0) | |
238 | pcwd_private.supports_temp = 1; | |
239 | } | |
240 | ||
af3b38d9 WVS |
241 | static inline char *get_firmware(void) |
242 | { | |
243 | int one, ten, hund, minor; | |
244 | char *ret; | |
245 | ||
246 | ret = kmalloc(6, GFP_KERNEL); | |
247 | if(ret == NULL) | |
248 | return NULL; | |
249 | ||
250 | if (set_command_mode()) { | |
251 | one = send_isa_command(CMD_ISA_VERSION_INTEGER); | |
252 | ten = send_isa_command(CMD_ISA_VERSION_TENTH); | |
253 | hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH); | |
254 | minor = send_isa_command(CMD_ISA_VERSION_MINOR); | |
255 | sprintf(ret, "%c.%c%c%c", one, ten, hund, minor); | |
256 | } | |
257 | else | |
258 | sprintf(ret, "ERROR"); | |
259 | ||
260 | unset_command_mode(); | |
261 | return(ret); | |
262 | } | |
263 | ||
264 | static inline int pcwd_get_option_switches(void) | |
265 | { | |
266 | int option_switches=0; | |
267 | ||
268 | if (set_command_mode()) { | |
269 | /* Get switch settings */ | |
270 | option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS); | |
271 | } | |
272 | ||
273 | unset_command_mode(); | |
274 | return(option_switches); | |
275 | } | |
276 | ||
277 | static void pcwd_show_card_info(void) | |
278 | { | |
279 | char *firmware; | |
280 | int option_switches; | |
281 | ||
282 | /* Get some extra info from the hardware (in command/debug/diag mode) */ | |
283 | if (pcwd_private.revision == PCWD_REVISION_A) | |
284 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", pcwd_private.io_addr); | |
285 | else if (pcwd_private.revision == PCWD_REVISION_C) { | |
286 | firmware = get_firmware(); | |
287 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n", | |
288 | pcwd_private.io_addr, firmware); | |
289 | kfree(firmware); | |
290 | option_switches = pcwd_get_option_switches(); | |
291 | printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", | |
292 | option_switches, | |
293 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
294 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
295 | ||
296 | /* Reprogram internal heartbeat to 2 seconds */ | |
297 | if (set_command_mode()) { | |
298 | send_isa_command(CMD_ISA_DELAY_TIME_2SECS); | |
299 | unset_command_mode(); | |
300 | } | |
301 | } | |
302 | ||
303 | if (pcwd_private.supports_temp) | |
304 | printk(KERN_INFO PFX "Temperature Option Detected\n"); | |
305 | ||
306 | if (pcwd_private.boot_status & WDIOF_CARDRESET) | |
307 | printk(KERN_INFO PFX "Previous reboot was caused by the card\n"); | |
308 | ||
309 | if (pcwd_private.boot_status & WDIOF_OVERHEAT) { | |
310 | printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n"); | |
311 | printk(KERN_EMERG PFX "CPU Overheat\n"); | |
312 | } | |
313 | ||
314 | if (pcwd_private.boot_status == 0) | |
315 | printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n"); | |
316 | } | |
317 | ||
1da177e4 LT |
318 | static void pcwd_timer_ping(unsigned long data) |
319 | { | |
320 | int wdrst_stat; | |
321 | ||
322 | /* If we got a heartbeat pulse within the WDT_INTERVAL | |
323 | * we agree to ping the WDT */ | |
a2be8786 | 324 | if(time_before(jiffies, pcwd_private.next_heartbeat)) { |
1da177e4 | 325 | /* Ping the watchdog */ |
a2be8786 WVS |
326 | spin_lock(&pcwd_private.io_lock); |
327 | if (pcwd_private.revision == PCWD_REVISION_A) { | |
1da177e4 | 328 | /* Rev A cards are reset by setting the WD_WDRST bit in register 1 */ |
a2be8786 | 329 | wdrst_stat = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
330 | wdrst_stat &= 0x0F; |
331 | wdrst_stat |= WD_WDRST; | |
332 | ||
a2be8786 | 333 | outb_p(wdrst_stat, pcwd_private.io_addr + 1); |
1da177e4 LT |
334 | } else { |
335 | /* Re-trigger watchdog by writing to port 0 */ | |
a2be8786 | 336 | outb_p(0x00, pcwd_private.io_addr); |
1da177e4 LT |
337 | } |
338 | ||
339 | /* Re-set the timer interval */ | |
a2be8786 | 340 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 | 341 | |
a2be8786 | 342 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
343 | } else { |
344 | printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n"); | |
345 | } | |
346 | } | |
347 | ||
348 | static int pcwd_start(void) | |
349 | { | |
350 | int stat_reg; | |
351 | ||
a2be8786 | 352 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
1da177e4 LT |
353 | |
354 | /* Start the timer */ | |
a2be8786 | 355 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 LT |
356 | |
357 | /* Enable the port */ | |
a2be8786 WVS |
358 | if (pcwd_private.revision == PCWD_REVISION_C) { |
359 | spin_lock(&pcwd_private.io_lock); | |
360 | outb_p(0x00, pcwd_private.io_addr + 3); | |
1da177e4 | 361 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
362 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
363 | spin_unlock(&pcwd_private.io_lock); | |
8f0235dc | 364 | if (stat_reg & WD_WDIS) { |
1da177e4 LT |
365 | printk(KERN_INFO PFX "Could not start watchdog\n"); |
366 | return -EIO; | |
367 | } | |
368 | } | |
369 | return 0; | |
370 | } | |
371 | ||
372 | static int pcwd_stop(void) | |
373 | { | |
374 | int stat_reg; | |
375 | ||
376 | /* Stop the timer */ | |
a2be8786 | 377 | del_timer(&pcwd_private.timer); |
1da177e4 LT |
378 | |
379 | /* Disable the board */ | |
a2be8786 WVS |
380 | if (pcwd_private.revision == PCWD_REVISION_C) { |
381 | spin_lock(&pcwd_private.io_lock); | |
382 | outb_p(0xA5, pcwd_private.io_addr + 3); | |
1da177e4 | 383 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 384 | outb_p(0xA5, pcwd_private.io_addr + 3); |
1da177e4 | 385 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
386 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
387 | spin_unlock(&pcwd_private.io_lock); | |
8f0235dc | 388 | if ((stat_reg & WD_WDIS) == 0) { |
1da177e4 LT |
389 | printk(KERN_INFO PFX "Could not stop watchdog\n"); |
390 | return -EIO; | |
391 | } | |
392 | } | |
393 | return 0; | |
394 | } | |
395 | ||
396 | static int pcwd_keepalive(void) | |
397 | { | |
398 | /* user land ping */ | |
a2be8786 | 399 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
1da177e4 LT |
400 | return 0; |
401 | } | |
402 | ||
403 | static int pcwd_set_heartbeat(int t) | |
404 | { | |
405 | if ((t < 2) || (t > 7200)) /* arbitrary upper limit */ | |
406 | return -EINVAL; | |
407 | ||
408 | heartbeat = t; | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static int pcwd_get_status(int *status) | |
413 | { | |
4206f0c4 | 414 | int control_status; |
1da177e4 LT |
415 | |
416 | *status=0; | |
a2be8786 WVS |
417 | spin_lock(&pcwd_private.io_lock); |
418 | if (pcwd_private.revision == PCWD_REVISION_A) | |
1da177e4 LT |
419 | /* Rev A cards return status information from |
420 | * the base register, which is used for the | |
421 | * temperature in other cards. */ | |
4206f0c4 | 422 | control_status = inb(pcwd_private.io_addr); |
1da177e4 LT |
423 | else { |
424 | /* Rev C cards return card status in the base | |
425 | * address + 1 register. And use different bits | |
426 | * to indicate a card initiated reset, and an | |
427 | * over-temperature condition. And the reboot | |
428 | * status can be reset. */ | |
4206f0c4 | 429 | control_status = inb(pcwd_private.io_addr + 1); |
1da177e4 | 430 | } |
a2be8786 | 431 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 432 | |
a2be8786 | 433 | if (pcwd_private.revision == PCWD_REVISION_A) { |
4206f0c4 | 434 | if (control_status & WD_WDRST) |
1da177e4 LT |
435 | *status |= WDIOF_CARDRESET; |
436 | ||
4206f0c4 | 437 | if (control_status & WD_T110) { |
1da177e4 LT |
438 | *status |= WDIOF_OVERHEAT; |
439 | if (temp_panic) { | |
440 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
68acc05d | 441 | kernel_power_off(); |
1da177e4 LT |
442 | } |
443 | } | |
444 | } else { | |
4206f0c4 | 445 | if (control_status & WD_REVC_WTRP) |
1da177e4 LT |
446 | *status |= WDIOF_CARDRESET; |
447 | ||
4206f0c4 | 448 | if (control_status & WD_REVC_TTRP) { |
1da177e4 LT |
449 | *status |= WDIOF_OVERHEAT; |
450 | if (temp_panic) { | |
451 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
68acc05d | 452 | kernel_power_off(); |
1da177e4 LT |
453 | } |
454 | } | |
455 | } | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | static int pcwd_clear_status(void) | |
461 | { | |
4206f0c4 WVS |
462 | int control_status; |
463 | ||
a2be8786 WVS |
464 | if (pcwd_private.revision == PCWD_REVISION_C) { |
465 | spin_lock(&pcwd_private.io_lock); | |
4206f0c4 WVS |
466 | |
467 | control_status = inb_p(pcwd_private.io_addr + 1); | |
468 | ||
469 | /* clear reset status & Keep Relay 2 disable state as it is */ | |
470 | outb_p((control_status & WD_REVC_R2DS), pcwd_private.io_addr + 1); | |
471 | ||
a2be8786 | 472 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
473 | } |
474 | return 0; | |
475 | } | |
476 | ||
477 | static int pcwd_get_temperature(int *temperature) | |
478 | { | |
479 | /* check that port 0 gives temperature info and no command results */ | |
a2be8786 | 480 | if (pcwd_private.command_mode) |
1da177e4 LT |
481 | return -1; |
482 | ||
483 | *temperature = 0; | |
a2be8786 | 484 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
485 | return -ENODEV; |
486 | ||
487 | /* | |
488 | * Convert celsius to fahrenheit, since this was | |
489 | * the decided 'standard' for this return value. | |
490 | */ | |
a2be8786 WVS |
491 | spin_lock(&pcwd_private.io_lock); |
492 | *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; | |
493 | spin_unlock(&pcwd_private.io_lock); | |
1da177e4 LT |
494 | |
495 | return 0; | |
496 | } | |
497 | ||
498 | /* | |
499 | * /dev/watchdog handling | |
500 | */ | |
501 | ||
502 | static int pcwd_ioctl(struct inode *inode, struct file *file, | |
503 | unsigned int cmd, unsigned long arg) | |
504 | { | |
505 | int rv; | |
506 | int status; | |
507 | int temperature; | |
508 | int new_heartbeat; | |
509 | int __user *argp = (int __user *)arg; | |
510 | static struct watchdog_info ident = { | |
511 | .options = WDIOF_OVERHEAT | | |
512 | WDIOF_CARDRESET | | |
513 | WDIOF_KEEPALIVEPING | | |
514 | WDIOF_SETTIMEOUT | | |
515 | WDIOF_MAGICCLOSE, | |
516 | .firmware_version = 1, | |
517 | .identity = "PCWD", | |
518 | }; | |
519 | ||
520 | switch(cmd) { | |
521 | default: | |
522 | return -ENOIOCTLCMD; | |
523 | ||
524 | case WDIOC_GETSUPPORT: | |
525 | if(copy_to_user(argp, &ident, sizeof(ident))) | |
526 | return -EFAULT; | |
527 | return 0; | |
528 | ||
529 | case WDIOC_GETSTATUS: | |
530 | pcwd_get_status(&status); | |
531 | return put_user(status, argp); | |
532 | ||
533 | case WDIOC_GETBOOTSTATUS: | |
a2be8786 | 534 | return put_user(pcwd_private.boot_status, argp); |
1da177e4 LT |
535 | |
536 | case WDIOC_GETTEMP: | |
537 | if (pcwd_get_temperature(&temperature)) | |
538 | return -EFAULT; | |
539 | ||
540 | return put_user(temperature, argp); | |
541 | ||
542 | case WDIOC_SETOPTIONS: | |
a2be8786 | 543 | if (pcwd_private.revision == PCWD_REVISION_C) |
1da177e4 LT |
544 | { |
545 | if(copy_from_user(&rv, argp, sizeof(int))) | |
546 | return -EFAULT; | |
547 | ||
548 | if (rv & WDIOS_DISABLECARD) | |
549 | { | |
550 | return pcwd_stop(); | |
551 | } | |
552 | ||
553 | if (rv & WDIOS_ENABLECARD) | |
554 | { | |
555 | return pcwd_start(); | |
556 | } | |
557 | ||
558 | if (rv & WDIOS_TEMPPANIC) | |
559 | { | |
560 | temp_panic = 1; | |
561 | } | |
562 | } | |
563 | return -EINVAL; | |
564 | ||
565 | case WDIOC_KEEPALIVE: | |
566 | pcwd_keepalive(); | |
567 | return 0; | |
568 | ||
569 | case WDIOC_SETTIMEOUT: | |
570 | if (get_user(new_heartbeat, argp)) | |
571 | return -EFAULT; | |
572 | ||
573 | if (pcwd_set_heartbeat(new_heartbeat)) | |
574 | return -EINVAL; | |
575 | ||
576 | pcwd_keepalive(); | |
577 | /* Fall */ | |
578 | ||
579 | case WDIOC_GETTIMEOUT: | |
580 | return put_user(heartbeat, argp); | |
581 | } | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, | |
587 | loff_t *ppos) | |
588 | { | |
589 | if (len) { | |
590 | if (!nowayout) { | |
591 | size_t i; | |
592 | ||
593 | /* In case it was set long ago */ | |
594 | expect_close = 0; | |
595 | ||
596 | for (i = 0; i != len; i++) { | |
597 | char c; | |
598 | ||
599 | if (get_user(c, buf + i)) | |
600 | return -EFAULT; | |
601 | if (c == 'V') | |
602 | expect_close = 42; | |
603 | } | |
604 | } | |
605 | pcwd_keepalive(); | |
606 | } | |
607 | return len; | |
608 | } | |
609 | ||
610 | static int pcwd_open(struct inode *inode, struct file *file) | |
611 | { | |
612 | if (!atomic_dec_and_test(&open_allowed) ) { | |
613 | atomic_inc( &open_allowed ); | |
614 | return -EBUSY; | |
615 | } | |
616 | ||
617 | if (nowayout) | |
618 | __module_get(THIS_MODULE); | |
619 | ||
620 | /* Activate */ | |
621 | pcwd_start(); | |
622 | pcwd_keepalive(); | |
623 | return nonseekable_open(inode, file); | |
624 | } | |
625 | ||
626 | static int pcwd_close(struct inode *inode, struct file *file) | |
627 | { | |
628 | if (expect_close == 42) { | |
629 | pcwd_stop(); | |
630 | } else { | |
631 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); | |
632 | pcwd_keepalive(); | |
633 | } | |
634 | expect_close = 0; | |
635 | atomic_inc( &open_allowed ); | |
636 | return 0; | |
637 | } | |
638 | ||
639 | /* | |
640 | * /dev/temperature handling | |
641 | */ | |
642 | ||
643 | static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, | |
644 | loff_t *ppos) | |
645 | { | |
646 | int temperature; | |
647 | ||
648 | if (pcwd_get_temperature(&temperature)) | |
649 | return -EFAULT; | |
650 | ||
651 | if (copy_to_user(buf, &temperature, 1)) | |
652 | return -EFAULT; | |
653 | ||
654 | return 1; | |
655 | } | |
656 | ||
657 | static int pcwd_temp_open(struct inode *inode, struct file *file) | |
658 | { | |
a2be8786 | 659 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
660 | return -ENODEV; |
661 | ||
662 | return nonseekable_open(inode, file); | |
663 | } | |
664 | ||
665 | static int pcwd_temp_close(struct inode *inode, struct file *file) | |
666 | { | |
667 | return 0; | |
668 | } | |
669 | ||
670 | /* | |
671 | * Notify system | |
672 | */ | |
673 | ||
674 | static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
675 | { | |
676 | if (code==SYS_DOWN || code==SYS_HALT) { | |
677 | /* Turn the WDT off */ | |
678 | pcwd_stop(); | |
679 | } | |
680 | ||
681 | return NOTIFY_DONE; | |
682 | } | |
683 | ||
684 | /* | |
685 | * Kernel Interfaces | |
686 | */ | |
687 | ||
688 | static struct file_operations pcwd_fops = { | |
689 | .owner = THIS_MODULE, | |
690 | .llseek = no_llseek, | |
691 | .write = pcwd_write, | |
692 | .ioctl = pcwd_ioctl, | |
693 | .open = pcwd_open, | |
694 | .release = pcwd_close, | |
695 | }; | |
696 | ||
697 | static struct miscdevice pcwd_miscdev = { | |
698 | .minor = WATCHDOG_MINOR, | |
699 | .name = "watchdog", | |
700 | .fops = &pcwd_fops, | |
701 | }; | |
702 | ||
703 | static struct file_operations pcwd_temp_fops = { | |
704 | .owner = THIS_MODULE, | |
705 | .llseek = no_llseek, | |
706 | .read = pcwd_temp_read, | |
707 | .open = pcwd_temp_open, | |
708 | .release = pcwd_temp_close, | |
709 | }; | |
710 | ||
711 | static struct miscdevice temp_miscdev = { | |
712 | .minor = TEMP_MINOR, | |
713 | .name = "temperature", | |
714 | .fops = &pcwd_temp_fops, | |
715 | }; | |
716 | ||
717 | static struct notifier_block pcwd_notifier = { | |
718 | .notifier_call = pcwd_notify_sys, | |
719 | }; | |
720 | ||
721 | /* | |
722 | * Init & exit routines | |
723 | */ | |
724 | ||
1da177e4 LT |
725 | static inline int get_revision(void) |
726 | { | |
727 | int r = PCWD_REVISION_C; | |
728 | ||
a2be8786 | 729 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
730 | /* REV A cards use only 2 io ports; test |
731 | * presumes a floating bus reads as 0xff. */ | |
a2be8786 WVS |
732 | if ((inb(pcwd_private.io_addr + 2) == 0xFF) || |
733 | (inb(pcwd_private.io_addr + 3) == 0xFF)) | |
1da177e4 | 734 | r=PCWD_REVISION_A; |
a2be8786 | 735 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
736 | |
737 | return r; | |
738 | } | |
739 | ||
1da177e4 LT |
740 | static int __devinit pcwatchdog_init(int base_addr) |
741 | { | |
742 | int ret; | |
1da177e4 LT |
743 | |
744 | cards_found++; | |
745 | if (cards_found == 1) | |
746 | printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER); | |
747 | ||
748 | if (cards_found > 1) { | |
749 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); | |
750 | return -ENODEV; | |
751 | } | |
752 | ||
753 | if (base_addr == 0x0000) { | |
754 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); | |
755 | return -ENODEV; | |
756 | } | |
a2be8786 | 757 | pcwd_private.io_addr = base_addr; |
1da177e4 LT |
758 | |
759 | /* Check card's revision */ | |
a2be8786 | 760 | pcwd_private.revision = get_revision(); |
1da177e4 | 761 | |
a2be8786 | 762 | if (!request_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { |
1da177e4 | 763 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", |
a2be8786 WVS |
764 | pcwd_private.io_addr); |
765 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
766 | return -EIO; |
767 | } | |
768 | ||
769 | /* Initial variables */ | |
a2be8786 | 770 | pcwd_private.supports_temp = 0; |
1da177e4 | 771 | temp_panic = 0; |
a2be8786 | 772 | pcwd_private.boot_status = 0x0000; |
1da177e4 LT |
773 | |
774 | /* get the boot_status */ | |
a2be8786 | 775 | pcwd_get_status(&pcwd_private.boot_status); |
1da177e4 LT |
776 | |
777 | /* clear the "card caused reboot" flag */ | |
778 | pcwd_clear_status(); | |
779 | ||
a2be8786 WVS |
780 | init_timer(&pcwd_private.timer); |
781 | pcwd_private.timer.function = pcwd_timer_ping; | |
782 | pcwd_private.timer.data = 0; | |
1da177e4 LT |
783 | |
784 | /* Disable the board */ | |
785 | pcwd_stop(); | |
786 | ||
787 | /* Check whether or not the card supports the temperature device */ | |
85875211 | 788 | pcwd_check_temperature_support(); |
1da177e4 | 789 | |
af3b38d9 WVS |
790 | /* Show info about the card itself */ |
791 | pcwd_show_card_info(); | |
1da177e4 LT |
792 | |
793 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
fd41fa61 WVS |
794 | if (pcwd_set_heartbeat(heartbeat)) { |
795 | pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); | |
796 | printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n", | |
797 | WATCHDOG_HEARTBEAT); | |
1da177e4 LT |
798 | } |
799 | ||
800 | ret = register_reboot_notifier(&pcwd_notifier); | |
801 | if (ret) { | |
802 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", | |
803 | ret); | |
a2be8786 WVS |
804 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
805 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
806 | return ret; |
807 | } | |
808 | ||
a2be8786 | 809 | if (pcwd_private.supports_temp) { |
1da177e4 LT |
810 | ret = misc_register(&temp_miscdev); |
811 | if (ret) { | |
812 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
813 | TEMP_MINOR, ret); | |
814 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
815 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
816 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
817 | return ret; |
818 | } | |
819 | } | |
820 | ||
821 | ret = misc_register(&pcwd_miscdev); | |
822 | if (ret) { | |
823 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
824 | WATCHDOG_MINOR, ret); | |
a2be8786 | 825 | if (pcwd_private.supports_temp) |
1da177e4 LT |
826 | misc_deregister(&temp_miscdev); |
827 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
828 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
829 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
830 | return ret; |
831 | } | |
832 | ||
833 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
834 | heartbeat, nowayout); | |
835 | ||
836 | return 0; | |
837 | } | |
838 | ||
839 | static void __devexit pcwatchdog_exit(void) | |
840 | { | |
841 | /* Disable the board */ | |
842 | if (!nowayout) | |
843 | pcwd_stop(); | |
844 | ||
845 | /* Deregister */ | |
846 | misc_deregister(&pcwd_miscdev); | |
a2be8786 | 847 | if (pcwd_private.supports_temp) |
1da177e4 LT |
848 | misc_deregister(&temp_miscdev); |
849 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
850 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
851 | pcwd_private.io_addr = 0x0000; | |
f1c3a056 | 852 | cards_found--; |
1da177e4 LT |
853 | } |
854 | ||
855 | /* | |
856 | * The ISA cards have a heartbeat bit in one of the registers, which | |
857 | * register is card dependent. The heartbeat bit is monitored, and if | |
858 | * found, is considered proof that a Berkshire card has been found. | |
859 | * The initial rate is once per second at board start up, then twice | |
860 | * per second for normal operation. | |
861 | */ | |
862 | static int __init pcwd_checkcard(int base_addr) | |
863 | { | |
864 | int port0, last_port0; /* Reg 0, in case it's REV A */ | |
865 | int port1, last_port1; /* Register 1 for REV C cards */ | |
866 | int i; | |
867 | int retval; | |
868 | ||
869 | if (!request_region (base_addr, 4, "PCWD")) { | |
870 | printk (KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr); | |
871 | return 0; | |
872 | } | |
873 | ||
874 | retval = 0; | |
875 | ||
876 | port0 = inb_p(base_addr); /* For REV A boards */ | |
877 | port1 = inb_p(base_addr + 1); /* For REV C boards */ | |
878 | if (port0 != 0xff || port1 != 0xff) { | |
879 | /* Not an 'ff' from a floating bus, so must be a card! */ | |
880 | for (i = 0; i < 4; ++i) { | |
881 | ||
882 | msleep(500); | |
883 | ||
884 | last_port0 = port0; | |
885 | last_port1 = port1; | |
886 | ||
887 | port0 = inb_p(base_addr); | |
888 | port1 = inb_p(base_addr + 1); | |
889 | ||
890 | /* Has either hearbeat bit changed? */ | |
891 | if ((port0 ^ last_port0) & WD_HRTBT || | |
892 | (port1 ^ last_port1) & WD_REVC_HRBT) { | |
893 | retval = 1; | |
894 | break; | |
895 | } | |
896 | } | |
897 | } | |
898 | release_region (base_addr, 4); | |
899 | ||
900 | return retval; | |
901 | } | |
902 | ||
903 | /* | |
904 | * These are the auto-probe addresses available. | |
905 | * | |
906 | * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350. | |
907 | * Revision A has an address range of 2 addresses, while Revision C has 4. | |
908 | */ | |
909 | static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; | |
910 | ||
911 | static int __init pcwd_init_module(void) | |
912 | { | |
913 | int i, found = 0; | |
914 | ||
a2be8786 | 915 | spin_lock_init(&pcwd_private.io_lock); |
1da177e4 LT |
916 | |
917 | for (i = 0; pcwd_ioports[i] != 0; i++) { | |
918 | if (pcwd_checkcard(pcwd_ioports[i])) { | |
919 | if (!(pcwatchdog_init(pcwd_ioports[i]))) | |
920 | found++; | |
921 | } | |
922 | } | |
923 | ||
924 | if (!found) { | |
925 | printk (KERN_INFO PFX "No card detected, or port not available\n"); | |
926 | return -ENODEV; | |
927 | } | |
928 | ||
929 | return 0; | |
930 | } | |
931 | ||
932 | static void __exit pcwd_cleanup_module(void) | |
933 | { | |
a2be8786 | 934 | if (pcwd_private.io_addr) |
1da177e4 LT |
935 | pcwatchdog_exit(); |
936 | return; | |
937 | } | |
938 | ||
939 | module_init(pcwd_init_module); | |
940 | module_exit(pcwd_cleanup_module); | |
941 | ||
942 | MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>"); | |
943 | MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); | |
944 | MODULE_LICENSE("GPL"); | |
945 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
946 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |