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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 | 148 | static struct { /* this is private data for each ISA-PC watchdog card */ |
2891b6ad | 149 | char fw_ver_str[6]; /* The cards firmware version */ |
a2be8786 WVS |
150 | int revision; /* The card's revision */ |
151 | int supports_temp; /* Wether or not the card has a temperature device */ | |
152 | int command_mode; /* Wether or not the card is in command mode */ | |
153 | int boot_status; /* The card's boot status */ | |
154 | int io_addr; /* The cards I/O address */ | |
155 | spinlock_t io_lock; /* the lock for io operations */ | |
156 | struct timer_list timer; /* The timer that pings the watchdog */ | |
157 | unsigned long next_heartbeat; /* the next_heartbeat for the timer */ | |
158 | } pcwd_private; | |
1da177e4 LT |
159 | |
160 | /* module parameters */ | |
161 | #define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat */ | |
162 | static int heartbeat = WATCHDOG_HEARTBEAT; | |
163 | module_param(heartbeat, int, 0); | |
164 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); | |
165 | ||
4bfdf378 | 166 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 LT |
167 | module_param(nowayout, int, 0); |
168 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
169 | ||
170 | /* | |
171 | * Internal functions | |
172 | */ | |
173 | ||
174 | static int send_isa_command(int cmd) | |
175 | { | |
176 | int i; | |
177 | int control_status; | |
178 | int port0, last_port0; /* Double read for stabilising */ | |
179 | ||
180 | /* The WCMD bit must be 1 and the command is only 4 bits in size */ | |
8f0235dc | 181 | control_status = (cmd & 0x0F) | WD_WCMD; |
a2be8786 | 182 | outb_p(control_status, pcwd_private.io_addr + 2); |
1da177e4 LT |
183 | udelay(ISA_COMMAND_TIMEOUT); |
184 | ||
a2be8786 | 185 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
186 | for (i = 0; i < 25; ++i) { |
187 | last_port0 = port0; | |
a2be8786 | 188 | port0 = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
189 | |
190 | if (port0 == last_port0) | |
191 | break; /* Data is stable */ | |
192 | ||
193 | udelay (250); | |
194 | } | |
195 | ||
196 | return port0; | |
197 | } | |
198 | ||
199 | static int set_command_mode(void) | |
200 | { | |
201 | int i, found=0, count=0; | |
202 | ||
203 | /* Set the card into command mode */ | |
a2be8786 | 204 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
205 | while ((!found) && (count < 3)) { |
206 | i = send_isa_command(CMD_ISA_IDLE); | |
207 | ||
208 | if (i == 0x00) | |
209 | found = 1; | |
210 | else if (i == 0xF3) { | |
211 | /* Card does not like what we've done to it */ | |
a2be8786 | 212 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 | 213 | udelay(1200); /* Spec says wait 1ms */ |
a2be8786 | 214 | outb_p(0x00, pcwd_private.io_addr + 2); |
1da177e4 LT |
215 | udelay(ISA_COMMAND_TIMEOUT); |
216 | } | |
217 | count++; | |
218 | } | |
a2be8786 WVS |
219 | spin_unlock(&pcwd_private.io_lock); |
220 | pcwd_private.command_mode = found; | |
1da177e4 LT |
221 | |
222 | return(found); | |
223 | } | |
224 | ||
225 | static void unset_command_mode(void) | |
226 | { | |
227 | /* Set the card into normal mode */ | |
a2be8786 WVS |
228 | spin_lock(&pcwd_private.io_lock); |
229 | outb_p(0x00, pcwd_private.io_addr + 2); | |
1da177e4 | 230 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 231 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 232 | |
a2be8786 | 233 | pcwd_private.command_mode = 0; |
1da177e4 LT |
234 | } |
235 | ||
85875211 WVS |
236 | static inline void pcwd_check_temperature_support(void) |
237 | { | |
238 | if (inb(pcwd_private.io_addr) != 0xF0) | |
239 | pcwd_private.supports_temp = 1; | |
240 | } | |
241 | ||
2891b6ad | 242 | static inline void pcwd_get_firmware(void) |
af3b38d9 WVS |
243 | { |
244 | int one, ten, hund, minor; | |
af3b38d9 | 245 | |
2891b6ad | 246 | sprintf(pcwd_private.fw_ver_str, "ERROR"); |
af3b38d9 WVS |
247 | |
248 | if (set_command_mode()) { | |
249 | one = send_isa_command(CMD_ISA_VERSION_INTEGER); | |
250 | ten = send_isa_command(CMD_ISA_VERSION_TENTH); | |
251 | hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH); | |
252 | minor = send_isa_command(CMD_ISA_VERSION_MINOR); | |
2891b6ad | 253 | sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", one, ten, hund, minor); |
af3b38d9 | 254 | } |
af3b38d9 | 255 | unset_command_mode(); |
2891b6ad WVS |
256 | |
257 | return; | |
af3b38d9 WVS |
258 | } |
259 | ||
260 | static inline int pcwd_get_option_switches(void) | |
261 | { | |
262 | int option_switches=0; | |
263 | ||
264 | if (set_command_mode()) { | |
265 | /* Get switch settings */ | |
266 | option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS); | |
267 | } | |
268 | ||
269 | unset_command_mode(); | |
270 | return(option_switches); | |
271 | } | |
272 | ||
273 | static void pcwd_show_card_info(void) | |
274 | { | |
af3b38d9 WVS |
275 | int option_switches; |
276 | ||
277 | /* Get some extra info from the hardware (in command/debug/diag mode) */ | |
278 | if (pcwd_private.revision == PCWD_REVISION_A) | |
279 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", pcwd_private.io_addr); | |
280 | else if (pcwd_private.revision == PCWD_REVISION_C) { | |
2891b6ad | 281 | pcwd_get_firmware(); |
af3b38d9 | 282 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n", |
2891b6ad | 283 | pcwd_private.io_addr, pcwd_private.fw_ver_str); |
af3b38d9 WVS |
284 | option_switches = pcwd_get_option_switches(); |
285 | printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", | |
286 | option_switches, | |
287 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
288 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
289 | ||
290 | /* Reprogram internal heartbeat to 2 seconds */ | |
291 | if (set_command_mode()) { | |
292 | send_isa_command(CMD_ISA_DELAY_TIME_2SECS); | |
293 | unset_command_mode(); | |
294 | } | |
295 | } | |
296 | ||
297 | if (pcwd_private.supports_temp) | |
298 | printk(KERN_INFO PFX "Temperature Option Detected\n"); | |
299 | ||
300 | if (pcwd_private.boot_status & WDIOF_CARDRESET) | |
301 | printk(KERN_INFO PFX "Previous reboot was caused by the card\n"); | |
302 | ||
303 | if (pcwd_private.boot_status & WDIOF_OVERHEAT) { | |
304 | printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n"); | |
305 | printk(KERN_EMERG PFX "CPU Overheat\n"); | |
306 | } | |
307 | ||
308 | if (pcwd_private.boot_status == 0) | |
309 | printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n"); | |
310 | } | |
311 | ||
1da177e4 LT |
312 | static void pcwd_timer_ping(unsigned long data) |
313 | { | |
314 | int wdrst_stat; | |
315 | ||
316 | /* If we got a heartbeat pulse within the WDT_INTERVAL | |
317 | * we agree to ping the WDT */ | |
a2be8786 | 318 | if(time_before(jiffies, pcwd_private.next_heartbeat)) { |
1da177e4 | 319 | /* Ping the watchdog */ |
a2be8786 WVS |
320 | spin_lock(&pcwd_private.io_lock); |
321 | if (pcwd_private.revision == PCWD_REVISION_A) { | |
1da177e4 | 322 | /* Rev A cards are reset by setting the WD_WDRST bit in register 1 */ |
a2be8786 | 323 | wdrst_stat = inb_p(pcwd_private.io_addr); |
1da177e4 LT |
324 | wdrst_stat &= 0x0F; |
325 | wdrst_stat |= WD_WDRST; | |
326 | ||
a2be8786 | 327 | outb_p(wdrst_stat, pcwd_private.io_addr + 1); |
1da177e4 LT |
328 | } else { |
329 | /* Re-trigger watchdog by writing to port 0 */ | |
a2be8786 | 330 | outb_p(0x00, pcwd_private.io_addr); |
1da177e4 LT |
331 | } |
332 | ||
333 | /* Re-set the timer interval */ | |
a2be8786 | 334 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 | 335 | |
a2be8786 | 336 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
337 | } else { |
338 | printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n"); | |
339 | } | |
340 | } | |
341 | ||
342 | static int pcwd_start(void) | |
343 | { | |
344 | int stat_reg; | |
345 | ||
a2be8786 | 346 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
1da177e4 LT |
347 | |
348 | /* Start the timer */ | |
a2be8786 | 349 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4 LT |
350 | |
351 | /* Enable the port */ | |
a2be8786 WVS |
352 | if (pcwd_private.revision == PCWD_REVISION_C) { |
353 | spin_lock(&pcwd_private.io_lock); | |
354 | outb_p(0x00, pcwd_private.io_addr + 3); | |
1da177e4 | 355 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
356 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
357 | spin_unlock(&pcwd_private.io_lock); | |
8f0235dc | 358 | if (stat_reg & WD_WDIS) { |
1da177e4 LT |
359 | printk(KERN_INFO PFX "Could not start watchdog\n"); |
360 | return -EIO; | |
361 | } | |
362 | } | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static int pcwd_stop(void) | |
367 | { | |
368 | int stat_reg; | |
369 | ||
370 | /* Stop the timer */ | |
a2be8786 | 371 | del_timer(&pcwd_private.timer); |
1da177e4 LT |
372 | |
373 | /* Disable the board */ | |
a2be8786 WVS |
374 | if (pcwd_private.revision == PCWD_REVISION_C) { |
375 | spin_lock(&pcwd_private.io_lock); | |
376 | outb_p(0xA5, pcwd_private.io_addr + 3); | |
1da177e4 | 377 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 | 378 | outb_p(0xA5, pcwd_private.io_addr + 3); |
1da177e4 | 379 | udelay(ISA_COMMAND_TIMEOUT); |
a2be8786 WVS |
380 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
381 | spin_unlock(&pcwd_private.io_lock); | |
8f0235dc | 382 | if ((stat_reg & WD_WDIS) == 0) { |
1da177e4 LT |
383 | printk(KERN_INFO PFX "Could not stop watchdog\n"); |
384 | return -EIO; | |
385 | } | |
386 | } | |
387 | return 0; | |
388 | } | |
389 | ||
390 | static int pcwd_keepalive(void) | |
391 | { | |
392 | /* user land ping */ | |
a2be8786 | 393 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
1da177e4 LT |
394 | return 0; |
395 | } | |
396 | ||
397 | static int pcwd_set_heartbeat(int t) | |
398 | { | |
399 | if ((t < 2) || (t > 7200)) /* arbitrary upper limit */ | |
400 | return -EINVAL; | |
401 | ||
402 | heartbeat = t; | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static int pcwd_get_status(int *status) | |
407 | { | |
4206f0c4 | 408 | int control_status; |
1da177e4 LT |
409 | |
410 | *status=0; | |
a2be8786 WVS |
411 | spin_lock(&pcwd_private.io_lock); |
412 | if (pcwd_private.revision == PCWD_REVISION_A) | |
1da177e4 LT |
413 | /* Rev A cards return status information from |
414 | * the base register, which is used for the | |
415 | * temperature in other cards. */ | |
4206f0c4 | 416 | control_status = inb(pcwd_private.io_addr); |
1da177e4 LT |
417 | else { |
418 | /* Rev C cards return card status in the base | |
419 | * address + 1 register. And use different bits | |
420 | * to indicate a card initiated reset, and an | |
421 | * over-temperature condition. And the reboot | |
422 | * status can be reset. */ | |
4206f0c4 | 423 | control_status = inb(pcwd_private.io_addr + 1); |
1da177e4 | 424 | } |
a2be8786 | 425 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 | 426 | |
a2be8786 | 427 | if (pcwd_private.revision == PCWD_REVISION_A) { |
4206f0c4 | 428 | if (control_status & WD_WDRST) |
1da177e4 LT |
429 | *status |= WDIOF_CARDRESET; |
430 | ||
4206f0c4 | 431 | if (control_status & WD_T110) { |
1da177e4 LT |
432 | *status |= WDIOF_OVERHEAT; |
433 | if (temp_panic) { | |
434 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
68acc05d | 435 | kernel_power_off(); |
1da177e4 LT |
436 | } |
437 | } | |
438 | } else { | |
4206f0c4 | 439 | if (control_status & WD_REVC_WTRP) |
1da177e4 LT |
440 | *status |= WDIOF_CARDRESET; |
441 | ||
4206f0c4 | 442 | if (control_status & WD_REVC_TTRP) { |
1da177e4 LT |
443 | *status |= WDIOF_OVERHEAT; |
444 | if (temp_panic) { | |
445 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); | |
68acc05d | 446 | kernel_power_off(); |
1da177e4 LT |
447 | } |
448 | } | |
449 | } | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
454 | static int pcwd_clear_status(void) | |
455 | { | |
4206f0c4 WVS |
456 | int control_status; |
457 | ||
a2be8786 WVS |
458 | if (pcwd_private.revision == PCWD_REVISION_C) { |
459 | spin_lock(&pcwd_private.io_lock); | |
4206f0c4 WVS |
460 | |
461 | control_status = inb_p(pcwd_private.io_addr + 1); | |
462 | ||
463 | /* clear reset status & Keep Relay 2 disable state as it is */ | |
464 | outb_p((control_status & WD_REVC_R2DS), pcwd_private.io_addr + 1); | |
465 | ||
a2be8786 | 466 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
467 | } |
468 | return 0; | |
469 | } | |
470 | ||
471 | static int pcwd_get_temperature(int *temperature) | |
472 | { | |
473 | /* check that port 0 gives temperature info and no command results */ | |
a2be8786 | 474 | if (pcwd_private.command_mode) |
1da177e4 LT |
475 | return -1; |
476 | ||
477 | *temperature = 0; | |
a2be8786 | 478 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
479 | return -ENODEV; |
480 | ||
481 | /* | |
482 | * Convert celsius to fahrenheit, since this was | |
483 | * the decided 'standard' for this return value. | |
484 | */ | |
a2be8786 WVS |
485 | spin_lock(&pcwd_private.io_lock); |
486 | *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; | |
487 | spin_unlock(&pcwd_private.io_lock); | |
1da177e4 LT |
488 | |
489 | return 0; | |
490 | } | |
491 | ||
492 | /* | |
493 | * /dev/watchdog handling | |
494 | */ | |
495 | ||
496 | static int pcwd_ioctl(struct inode *inode, struct file *file, | |
497 | unsigned int cmd, unsigned long arg) | |
498 | { | |
499 | int rv; | |
500 | int status; | |
501 | int temperature; | |
502 | int new_heartbeat; | |
503 | int __user *argp = (int __user *)arg; | |
504 | static struct watchdog_info ident = { | |
505 | .options = WDIOF_OVERHEAT | | |
506 | WDIOF_CARDRESET | | |
507 | WDIOF_KEEPALIVEPING | | |
508 | WDIOF_SETTIMEOUT | | |
509 | WDIOF_MAGICCLOSE, | |
510 | .firmware_version = 1, | |
511 | .identity = "PCWD", | |
512 | }; | |
513 | ||
514 | switch(cmd) { | |
515 | default: | |
516 | return -ENOIOCTLCMD; | |
517 | ||
518 | case WDIOC_GETSUPPORT: | |
519 | if(copy_to_user(argp, &ident, sizeof(ident))) | |
520 | return -EFAULT; | |
521 | return 0; | |
522 | ||
523 | case WDIOC_GETSTATUS: | |
524 | pcwd_get_status(&status); | |
525 | return put_user(status, argp); | |
526 | ||
527 | case WDIOC_GETBOOTSTATUS: | |
a2be8786 | 528 | return put_user(pcwd_private.boot_status, argp); |
1da177e4 LT |
529 | |
530 | case WDIOC_GETTEMP: | |
531 | if (pcwd_get_temperature(&temperature)) | |
532 | return -EFAULT; | |
533 | ||
534 | return put_user(temperature, argp); | |
535 | ||
536 | case WDIOC_SETOPTIONS: | |
a2be8786 | 537 | if (pcwd_private.revision == PCWD_REVISION_C) |
1da177e4 LT |
538 | { |
539 | if(copy_from_user(&rv, argp, sizeof(int))) | |
540 | return -EFAULT; | |
541 | ||
542 | if (rv & WDIOS_DISABLECARD) | |
543 | { | |
544 | return pcwd_stop(); | |
545 | } | |
546 | ||
547 | if (rv & WDIOS_ENABLECARD) | |
548 | { | |
549 | return pcwd_start(); | |
550 | } | |
551 | ||
552 | if (rv & WDIOS_TEMPPANIC) | |
553 | { | |
554 | temp_panic = 1; | |
555 | } | |
556 | } | |
557 | return -EINVAL; | |
558 | ||
559 | case WDIOC_KEEPALIVE: | |
560 | pcwd_keepalive(); | |
561 | return 0; | |
562 | ||
563 | case WDIOC_SETTIMEOUT: | |
564 | if (get_user(new_heartbeat, argp)) | |
565 | return -EFAULT; | |
566 | ||
567 | if (pcwd_set_heartbeat(new_heartbeat)) | |
568 | return -EINVAL; | |
569 | ||
570 | pcwd_keepalive(); | |
571 | /* Fall */ | |
572 | ||
573 | case WDIOC_GETTIMEOUT: | |
574 | return put_user(heartbeat, argp); | |
575 | } | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, | |
581 | loff_t *ppos) | |
582 | { | |
583 | if (len) { | |
584 | if (!nowayout) { | |
585 | size_t i; | |
586 | ||
587 | /* In case it was set long ago */ | |
588 | expect_close = 0; | |
589 | ||
590 | for (i = 0; i != len; i++) { | |
591 | char c; | |
592 | ||
593 | if (get_user(c, buf + i)) | |
594 | return -EFAULT; | |
595 | if (c == 'V') | |
596 | expect_close = 42; | |
597 | } | |
598 | } | |
599 | pcwd_keepalive(); | |
600 | } | |
601 | return len; | |
602 | } | |
603 | ||
604 | static int pcwd_open(struct inode *inode, struct file *file) | |
605 | { | |
606 | if (!atomic_dec_and_test(&open_allowed) ) { | |
607 | atomic_inc( &open_allowed ); | |
608 | return -EBUSY; | |
609 | } | |
610 | ||
611 | if (nowayout) | |
612 | __module_get(THIS_MODULE); | |
613 | ||
614 | /* Activate */ | |
615 | pcwd_start(); | |
616 | pcwd_keepalive(); | |
617 | return nonseekable_open(inode, file); | |
618 | } | |
619 | ||
620 | static int pcwd_close(struct inode *inode, struct file *file) | |
621 | { | |
622 | if (expect_close == 42) { | |
623 | pcwd_stop(); | |
624 | } else { | |
625 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); | |
626 | pcwd_keepalive(); | |
627 | } | |
628 | expect_close = 0; | |
629 | atomic_inc( &open_allowed ); | |
630 | return 0; | |
631 | } | |
632 | ||
633 | /* | |
634 | * /dev/temperature handling | |
635 | */ | |
636 | ||
637 | static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, | |
638 | loff_t *ppos) | |
639 | { | |
640 | int temperature; | |
641 | ||
642 | if (pcwd_get_temperature(&temperature)) | |
643 | return -EFAULT; | |
644 | ||
645 | if (copy_to_user(buf, &temperature, 1)) | |
646 | return -EFAULT; | |
647 | ||
648 | return 1; | |
649 | } | |
650 | ||
651 | static int pcwd_temp_open(struct inode *inode, struct file *file) | |
652 | { | |
a2be8786 | 653 | if (!pcwd_private.supports_temp) |
1da177e4 LT |
654 | return -ENODEV; |
655 | ||
656 | return nonseekable_open(inode, file); | |
657 | } | |
658 | ||
659 | static int pcwd_temp_close(struct inode *inode, struct file *file) | |
660 | { | |
661 | return 0; | |
662 | } | |
663 | ||
664 | /* | |
665 | * Notify system | |
666 | */ | |
667 | ||
668 | static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
669 | { | |
670 | if (code==SYS_DOWN || code==SYS_HALT) { | |
671 | /* Turn the WDT off */ | |
672 | pcwd_stop(); | |
673 | } | |
674 | ||
675 | return NOTIFY_DONE; | |
676 | } | |
677 | ||
678 | /* | |
679 | * Kernel Interfaces | |
680 | */ | |
681 | ||
682 | static struct file_operations pcwd_fops = { | |
683 | .owner = THIS_MODULE, | |
684 | .llseek = no_llseek, | |
685 | .write = pcwd_write, | |
686 | .ioctl = pcwd_ioctl, | |
687 | .open = pcwd_open, | |
688 | .release = pcwd_close, | |
689 | }; | |
690 | ||
691 | static struct miscdevice pcwd_miscdev = { | |
692 | .minor = WATCHDOG_MINOR, | |
693 | .name = "watchdog", | |
694 | .fops = &pcwd_fops, | |
695 | }; | |
696 | ||
697 | static struct file_operations pcwd_temp_fops = { | |
698 | .owner = THIS_MODULE, | |
699 | .llseek = no_llseek, | |
700 | .read = pcwd_temp_read, | |
701 | .open = pcwd_temp_open, | |
702 | .release = pcwd_temp_close, | |
703 | }; | |
704 | ||
705 | static struct miscdevice temp_miscdev = { | |
706 | .minor = TEMP_MINOR, | |
707 | .name = "temperature", | |
708 | .fops = &pcwd_temp_fops, | |
709 | }; | |
710 | ||
711 | static struct notifier_block pcwd_notifier = { | |
712 | .notifier_call = pcwd_notify_sys, | |
713 | }; | |
714 | ||
715 | /* | |
716 | * Init & exit routines | |
717 | */ | |
718 | ||
1da177e4 LT |
719 | static inline int get_revision(void) |
720 | { | |
721 | int r = PCWD_REVISION_C; | |
722 | ||
a2be8786 | 723 | spin_lock(&pcwd_private.io_lock); |
1da177e4 LT |
724 | /* REV A cards use only 2 io ports; test |
725 | * presumes a floating bus reads as 0xff. */ | |
a2be8786 WVS |
726 | if ((inb(pcwd_private.io_addr + 2) == 0xFF) || |
727 | (inb(pcwd_private.io_addr + 3) == 0xFF)) | |
1da177e4 | 728 | r=PCWD_REVISION_A; |
a2be8786 | 729 | spin_unlock(&pcwd_private.io_lock); |
1da177e4 LT |
730 | |
731 | return r; | |
732 | } | |
733 | ||
1da177e4 LT |
734 | static int __devinit pcwatchdog_init(int base_addr) |
735 | { | |
736 | int ret; | |
1da177e4 LT |
737 | |
738 | cards_found++; | |
739 | if (cards_found == 1) | |
740 | printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER); | |
741 | ||
742 | if (cards_found > 1) { | |
743 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); | |
744 | return -ENODEV; | |
745 | } | |
746 | ||
747 | if (base_addr == 0x0000) { | |
748 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); | |
749 | return -ENODEV; | |
750 | } | |
a2be8786 | 751 | pcwd_private.io_addr = base_addr; |
1da177e4 LT |
752 | |
753 | /* Check card's revision */ | |
a2be8786 | 754 | pcwd_private.revision = get_revision(); |
1da177e4 | 755 | |
a2be8786 | 756 | if (!request_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { |
1da177e4 | 757 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", |
a2be8786 WVS |
758 | pcwd_private.io_addr); |
759 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
760 | return -EIO; |
761 | } | |
762 | ||
763 | /* Initial variables */ | |
a2be8786 | 764 | pcwd_private.supports_temp = 0; |
1da177e4 | 765 | temp_panic = 0; |
a2be8786 | 766 | pcwd_private.boot_status = 0x0000; |
1da177e4 LT |
767 | |
768 | /* get the boot_status */ | |
a2be8786 | 769 | pcwd_get_status(&pcwd_private.boot_status); |
1da177e4 LT |
770 | |
771 | /* clear the "card caused reboot" flag */ | |
772 | pcwd_clear_status(); | |
773 | ||
a2be8786 WVS |
774 | init_timer(&pcwd_private.timer); |
775 | pcwd_private.timer.function = pcwd_timer_ping; | |
776 | pcwd_private.timer.data = 0; | |
1da177e4 LT |
777 | |
778 | /* Disable the board */ | |
779 | pcwd_stop(); | |
780 | ||
781 | /* Check whether or not the card supports the temperature device */ | |
85875211 | 782 | pcwd_check_temperature_support(); |
1da177e4 | 783 | |
af3b38d9 WVS |
784 | /* Show info about the card itself */ |
785 | pcwd_show_card_info(); | |
1da177e4 LT |
786 | |
787 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
fd41fa61 WVS |
788 | if (pcwd_set_heartbeat(heartbeat)) { |
789 | pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); | |
790 | printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n", | |
791 | WATCHDOG_HEARTBEAT); | |
1da177e4 LT |
792 | } |
793 | ||
794 | ret = register_reboot_notifier(&pcwd_notifier); | |
795 | if (ret) { | |
796 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", | |
797 | ret); | |
a2be8786 WVS |
798 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
799 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
800 | return ret; |
801 | } | |
802 | ||
a2be8786 | 803 | if (pcwd_private.supports_temp) { |
1da177e4 LT |
804 | ret = misc_register(&temp_miscdev); |
805 | if (ret) { | |
806 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
807 | TEMP_MINOR, ret); | |
808 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
809 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
810 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
811 | return ret; |
812 | } | |
813 | } | |
814 | ||
815 | ret = misc_register(&pcwd_miscdev); | |
816 | if (ret) { | |
817 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
818 | WATCHDOG_MINOR, ret); | |
a2be8786 | 819 | if (pcwd_private.supports_temp) |
1da177e4 LT |
820 | misc_deregister(&temp_miscdev); |
821 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
822 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
823 | pcwd_private.io_addr = 0x0000; | |
1da177e4 LT |
824 | return ret; |
825 | } | |
826 | ||
827 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
828 | heartbeat, nowayout); | |
829 | ||
830 | return 0; | |
831 | } | |
832 | ||
833 | static void __devexit pcwatchdog_exit(void) | |
834 | { | |
835 | /* Disable the board */ | |
836 | if (!nowayout) | |
837 | pcwd_stop(); | |
838 | ||
839 | /* Deregister */ | |
840 | misc_deregister(&pcwd_miscdev); | |
a2be8786 | 841 | if (pcwd_private.supports_temp) |
1da177e4 LT |
842 | misc_deregister(&temp_miscdev); |
843 | unregister_reboot_notifier(&pcwd_notifier); | |
a2be8786 WVS |
844 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
845 | pcwd_private.io_addr = 0x0000; | |
f1c3a056 | 846 | cards_found--; |
1da177e4 LT |
847 | } |
848 | ||
849 | /* | |
850 | * The ISA cards have a heartbeat bit in one of the registers, which | |
851 | * register is card dependent. The heartbeat bit is monitored, and if | |
852 | * found, is considered proof that a Berkshire card has been found. | |
853 | * The initial rate is once per second at board start up, then twice | |
854 | * per second for normal operation. | |
855 | */ | |
856 | static int __init pcwd_checkcard(int base_addr) | |
857 | { | |
858 | int port0, last_port0; /* Reg 0, in case it's REV A */ | |
859 | int port1, last_port1; /* Register 1 for REV C cards */ | |
860 | int i; | |
861 | int retval; | |
862 | ||
863 | if (!request_region (base_addr, 4, "PCWD")) { | |
864 | printk (KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr); | |
865 | return 0; | |
866 | } | |
867 | ||
868 | retval = 0; | |
869 | ||
870 | port0 = inb_p(base_addr); /* For REV A boards */ | |
871 | port1 = inb_p(base_addr + 1); /* For REV C boards */ | |
872 | if (port0 != 0xff || port1 != 0xff) { | |
873 | /* Not an 'ff' from a floating bus, so must be a card! */ | |
874 | for (i = 0; i < 4; ++i) { | |
875 | ||
876 | msleep(500); | |
877 | ||
878 | last_port0 = port0; | |
879 | last_port1 = port1; | |
880 | ||
881 | port0 = inb_p(base_addr); | |
882 | port1 = inb_p(base_addr + 1); | |
883 | ||
884 | /* Has either hearbeat bit changed? */ | |
885 | if ((port0 ^ last_port0) & WD_HRTBT || | |
886 | (port1 ^ last_port1) & WD_REVC_HRBT) { | |
887 | retval = 1; | |
888 | break; | |
889 | } | |
890 | } | |
891 | } | |
892 | release_region (base_addr, 4); | |
893 | ||
894 | return retval; | |
895 | } | |
896 | ||
897 | /* | |
898 | * These are the auto-probe addresses available. | |
899 | * | |
900 | * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350. | |
901 | * Revision A has an address range of 2 addresses, while Revision C has 4. | |
902 | */ | |
903 | static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; | |
904 | ||
905 | static int __init pcwd_init_module(void) | |
906 | { | |
907 | int i, found = 0; | |
908 | ||
a2be8786 | 909 | spin_lock_init(&pcwd_private.io_lock); |
1da177e4 LT |
910 | |
911 | for (i = 0; pcwd_ioports[i] != 0; i++) { | |
912 | if (pcwd_checkcard(pcwd_ioports[i])) { | |
913 | if (!(pcwatchdog_init(pcwd_ioports[i]))) | |
914 | found++; | |
915 | } | |
916 | } | |
917 | ||
918 | if (!found) { | |
919 | printk (KERN_INFO PFX "No card detected, or port not available\n"); | |
920 | return -ENODEV; | |
921 | } | |
922 | ||
923 | return 0; | |
924 | } | |
925 | ||
926 | static void __exit pcwd_cleanup_module(void) | |
927 | { | |
a2be8786 | 928 | if (pcwd_private.io_addr) |
1da177e4 | 929 | pcwatchdog_exit(); |
1da177e4 LT |
930 | } |
931 | ||
932 | module_init(pcwd_init_module); | |
933 | module_exit(pcwd_cleanup_module); | |
934 | ||
935 | MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>"); | |
936 | MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); | |
937 | MODULE_LICENSE("GPL"); | |
938 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
939 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |