3 * by Ken Hollis (khollis@bitgate.com)
5 * Permission granted from Simon Machell (73244.1270@compuserve.com)
6 * Written for the Linux Kernel, and GPLed by Ken Hollis
8 * 960107 Added request_region routines, modulized the whole thing.
9 * 960108 Fixed end-of-file pointer (Thanks to Dan Hollis), added
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
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
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/
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/... */
70 #include <asm/uaccess.h> /* For copy_to_user/put_user/... */
71 #include <asm/io.h> /* For inb/outb/... */
73 /* Module and version information */
74 #define WATCHDOG_VERSION "1.17"
75 #define WATCHDOG_DATE "12 Feb 2006"
76 #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog"
77 #define WATCHDOG_NAME "pcwd"
78 #define PFX WATCHDOG_NAME ": "
79 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n"
80 #define WD_VER WATCHDOG_VERSION " (" WATCHDOG_DATE ")"
83 * It should be noted that PCWD_REVISION_B was removed because A and B
84 * are essentially the same types of card, with the exception that B
85 * has temperature reporting. Since I didn't receive a Rev.B card,
86 * the Rev.B card is not supported. (It's a good thing too, as they
87 * are no longer in production.)
89 #define PCWD_REVISION_A 1
90 #define PCWD_REVISION_C 2
93 * These are the defines that describe the control status bits for the
94 * PCI-PC Watchdog card.
96 /* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */
97 #define WD_WDRST 0x01 /* Previously reset state */
98 #define WD_T110 0x02 /* Temperature overheat sense */
99 #define WD_HRTBT 0x04 /* Heartbeat sense */
100 #define WD_RLY2 0x08 /* External relay triggered */
101 #define WD_SRLY2 0x80 /* Software external relay triggered */
102 /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */
103 #define WD_REVC_WTRP 0x01 /* Watchdog Trip status */
104 #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */
105 #define WD_REVC_TTRP 0x04 /* Temperature Trip status */
106 #define WD_REVC_RL2A 0x08 /* Relay 2 activated by on-board processor */
107 #define WD_REVC_RL1A 0x10 /* Relay 1 active */
108 #define WD_REVC_R2DS 0x40 /* Relay 2 disable */
109 #define WD_REVC_RLY2 0x80 /* Relay 2 activated? */
110 /* Port 2 : Control Status #2 */
111 #define WD_WDIS 0x10 /* Watchdog Disabled */
112 #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */
113 #define WD_SSEL 0x40 /* Watchdog Switch Select (1:SW1 <-> 0:SW2) */
114 #define WD_WCMD 0x80 /* Watchdog Command Mode */
116 /* max. time we give an ISA watchdog card to process a command */
117 /* 500ms for each 4 bit response (according to spec.) */
118 #define ISA_COMMAND_TIMEOUT 1000
120 /* Watchdog's internal commands */
121 #define CMD_ISA_IDLE 0x00
122 #define CMD_ISA_VERSION_INTEGER 0x01
123 #define CMD_ISA_VERSION_TENTH 0x02
124 #define CMD_ISA_VERSION_HUNDRETH 0x03
125 #define CMD_ISA_VERSION_MINOR 0x04
126 #define CMD_ISA_SWITCH_SETTINGS 0x05
127 #define CMD_ISA_RESET_PC 0x06
128 #define CMD_ISA_ARM_0 0x07
129 #define CMD_ISA_ARM_30 0x08
130 #define CMD_ISA_ARM_60 0x09
131 #define CMD_ISA_DELAY_TIME_2SECS 0x0A
132 #define CMD_ISA_DELAY_TIME_4SECS 0x0B
133 #define CMD_ISA_DELAY_TIME_8SECS 0x0C
134 #define CMD_ISA_RESET_RELAYS 0x0D
137 * We are using an kernel timer to do the pinging of the watchdog
138 * every ~500ms. We try to set the internal heartbeat of the
142 #define WDT_INTERVAL (HZ/2+1)
144 /* We can only use 1 card due to the /dev/watchdog restriction */
145 static int cards_found
;
147 /* internal variables */
148 static atomic_t open_allowed
= ATOMIC_INIT(1);
149 static char expect_close
;
150 static int temp_panic
;
151 static struct { /* this is private data for each ISA-PC watchdog card */
152 char fw_ver_str
[6]; /* The cards firmware version */
153 int revision
; /* The card's revision */
154 int supports_temp
; /* Wether or not the card has a temperature device */
155 int command_mode
; /* Wether or not the card is in command mode */
156 int boot_status
; /* The card's boot status */
157 int io_addr
; /* The cards I/O address */
158 spinlock_t io_lock
; /* the lock for io operations */
159 struct timer_list timer
; /* The timer that pings the watchdog */
160 unsigned long next_heartbeat
; /* the next_heartbeat for the timer */
163 /* module parameters */
164 #define QUIET 0 /* Default */
165 #define VERBOSE 1 /* Verbose */
166 #define DEBUG 2 /* print fancy stuff too */
167 static int debug
= QUIET
;
168 module_param(debug
, int, 0);
169 MODULE_PARM_DESC(debug
, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
171 #define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat */
172 static int heartbeat
= WATCHDOG_HEARTBEAT
;
173 module_param(heartbeat
, int, 0);
174 MODULE_PARM_DESC(heartbeat
, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT
) ")");
176 static int nowayout
= WATCHDOG_NOWAYOUT
;
177 module_param(nowayout
, int, 0);
178 MODULE_PARM_DESC(nowayout
, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
184 static int send_isa_command(int cmd
)
188 int port0
, last_port0
; /* Double read for stabilising */
191 printk(KERN_DEBUG PFX
"sending following data cmd=0x%02x\n",
194 /* The WCMD bit must be 1 and the command is only 4 bits in size */
195 control_status
= (cmd
& 0x0F) | WD_WCMD
;
196 outb_p(control_status
, pcwd_private
.io_addr
+ 2);
197 udelay(ISA_COMMAND_TIMEOUT
);
199 port0
= inb_p(pcwd_private
.io_addr
);
200 for (i
= 0; i
< 25; ++i
) {
202 port0
= inb_p(pcwd_private
.io_addr
);
204 if (port0
== last_port0
)
205 break; /* Data is stable */
211 printk(KERN_DEBUG PFX
"received following data for cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n",
212 cmd
, port0
, last_port0
);
217 static int set_command_mode(void)
219 int i
, found
=0, count
=0;
221 /* Set the card into command mode */
222 spin_lock(&pcwd_private
.io_lock
);
223 while ((!found
) && (count
< 3)) {
224 i
= send_isa_command(CMD_ISA_IDLE
);
228 else if (i
== 0xF3) {
229 /* Card does not like what we've done to it */
230 outb_p(0x00, pcwd_private
.io_addr
+ 2);
231 udelay(1200); /* Spec says wait 1ms */
232 outb_p(0x00, pcwd_private
.io_addr
+ 2);
233 udelay(ISA_COMMAND_TIMEOUT
);
237 spin_unlock(&pcwd_private
.io_lock
);
238 pcwd_private
.command_mode
= found
;
241 printk(KERN_DEBUG PFX
"command_mode=%d\n",
242 pcwd_private
.command_mode
);
247 static void unset_command_mode(void)
249 /* Set the card into normal mode */
250 spin_lock(&pcwd_private
.io_lock
);
251 outb_p(0x00, pcwd_private
.io_addr
+ 2);
252 udelay(ISA_COMMAND_TIMEOUT
);
253 spin_unlock(&pcwd_private
.io_lock
);
255 pcwd_private
.command_mode
= 0;
258 printk(KERN_DEBUG PFX
"command_mode=%d\n",
259 pcwd_private
.command_mode
);
262 static inline void pcwd_check_temperature_support(void)
264 if (inb(pcwd_private
.io_addr
) != 0xF0)
265 pcwd_private
.supports_temp
= 1;
268 static inline void pcwd_get_firmware(void)
270 int one
, ten
, hund
, minor
;
272 strcpy(pcwd_private
.fw_ver_str
, "ERROR");
274 if (set_command_mode()) {
275 one
= send_isa_command(CMD_ISA_VERSION_INTEGER
);
276 ten
= send_isa_command(CMD_ISA_VERSION_TENTH
);
277 hund
= send_isa_command(CMD_ISA_VERSION_HUNDRETH
);
278 minor
= send_isa_command(CMD_ISA_VERSION_MINOR
);
279 sprintf(pcwd_private
.fw_ver_str
, "%c.%c%c%c", one
, ten
, hund
, minor
);
281 unset_command_mode();
286 static inline int pcwd_get_option_switches(void)
288 int option_switches
=0;
290 if (set_command_mode()) {
291 /* Get switch settings */
292 option_switches
= send_isa_command(CMD_ISA_SWITCH_SETTINGS
);
295 unset_command_mode();
296 return(option_switches
);
299 static void pcwd_show_card_info(void)
303 /* Get some extra info from the hardware (in command/debug/diag mode) */
304 if (pcwd_private
.revision
== PCWD_REVISION_A
)
305 printk(KERN_INFO PFX
"ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", pcwd_private
.io_addr
);
306 else if (pcwd_private
.revision
== PCWD_REVISION_C
) {
308 printk(KERN_INFO PFX
"ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n",
309 pcwd_private
.io_addr
, pcwd_private
.fw_ver_str
);
310 option_switches
= pcwd_get_option_switches();
311 printk(KERN_INFO PFX
"Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
313 ((option_switches
& 0x10) ? "ON" : "OFF"),
314 ((option_switches
& 0x08) ? "ON" : "OFF"));
316 /* Reprogram internal heartbeat to 2 seconds */
317 if (set_command_mode()) {
318 send_isa_command(CMD_ISA_DELAY_TIME_2SECS
);
319 unset_command_mode();
323 if (pcwd_private
.supports_temp
)
324 printk(KERN_INFO PFX
"Temperature Option Detected\n");
326 if (pcwd_private
.boot_status
& WDIOF_CARDRESET
)
327 printk(KERN_INFO PFX
"Previous reboot was caused by the card\n");
329 if (pcwd_private
.boot_status
& WDIOF_OVERHEAT
) {
330 printk(KERN_EMERG PFX
"Card senses a CPU Overheat. Panicking!\n");
331 printk(KERN_EMERG PFX
"CPU Overheat\n");
334 if (pcwd_private
.boot_status
== 0)
335 printk(KERN_INFO PFX
"No previous trip detected - Cold boot or reset\n");
338 static void pcwd_timer_ping(unsigned long data
)
342 /* If we got a heartbeat pulse within the WDT_INTERVAL
343 * we agree to ping the WDT */
344 if(time_before(jiffies
, pcwd_private
.next_heartbeat
)) {
345 /* Ping the watchdog */
346 spin_lock(&pcwd_private
.io_lock
);
347 if (pcwd_private
.revision
== PCWD_REVISION_A
) {
348 /* Rev A cards are reset by setting the WD_WDRST bit in register 1 */
349 wdrst_stat
= inb_p(pcwd_private
.io_addr
);
351 wdrst_stat
|= WD_WDRST
;
353 outb_p(wdrst_stat
, pcwd_private
.io_addr
+ 1);
355 /* Re-trigger watchdog by writing to port 0 */
356 outb_p(0x00, pcwd_private
.io_addr
);
359 /* Re-set the timer interval */
360 mod_timer(&pcwd_private
.timer
, jiffies
+ WDT_INTERVAL
);
362 spin_unlock(&pcwd_private
.io_lock
);
364 printk(KERN_WARNING PFX
"Heartbeat lost! Will not ping the watchdog\n");
368 static int pcwd_start(void)
372 pcwd_private
.next_heartbeat
= jiffies
+ (heartbeat
* HZ
);
374 /* Start the timer */
375 mod_timer(&pcwd_private
.timer
, jiffies
+ WDT_INTERVAL
);
377 /* Enable the port */
378 if (pcwd_private
.revision
== PCWD_REVISION_C
) {
379 spin_lock(&pcwd_private
.io_lock
);
380 outb_p(0x00, pcwd_private
.io_addr
+ 3);
381 udelay(ISA_COMMAND_TIMEOUT
);
382 stat_reg
= inb_p(pcwd_private
.io_addr
+ 2);
383 spin_unlock(&pcwd_private
.io_lock
);
384 if (stat_reg
& WD_WDIS
) {
385 printk(KERN_INFO PFX
"Could not start watchdog\n");
390 if (debug
>= VERBOSE
)
391 printk(KERN_DEBUG PFX
"Watchdog started\n");
396 static int pcwd_stop(void)
401 del_timer(&pcwd_private
.timer
);
403 /* Disable the board */
404 if (pcwd_private
.revision
== PCWD_REVISION_C
) {
405 spin_lock(&pcwd_private
.io_lock
);
406 outb_p(0xA5, pcwd_private
.io_addr
+ 3);
407 udelay(ISA_COMMAND_TIMEOUT
);
408 outb_p(0xA5, pcwd_private
.io_addr
+ 3);
409 udelay(ISA_COMMAND_TIMEOUT
);
410 stat_reg
= inb_p(pcwd_private
.io_addr
+ 2);
411 spin_unlock(&pcwd_private
.io_lock
);
412 if ((stat_reg
& WD_WDIS
) == 0) {
413 printk(KERN_INFO PFX
"Could not stop watchdog\n");
418 if (debug
>= VERBOSE
)
419 printk(KERN_DEBUG PFX
"Watchdog stopped\n");
424 static int pcwd_keepalive(void)
427 pcwd_private
.next_heartbeat
= jiffies
+ (heartbeat
* HZ
);
430 printk(KERN_DEBUG PFX
"Watchdog keepalive signal send\n");
435 static int pcwd_set_heartbeat(int t
)
437 if ((t
< 2) || (t
> 7200)) /* arbitrary upper limit */
442 if (debug
>= VERBOSE
)
443 printk(KERN_DEBUG PFX
"New heartbeat: %d\n",
449 static int pcwd_get_status(int *status
)
454 spin_lock(&pcwd_private
.io_lock
);
455 if (pcwd_private
.revision
== PCWD_REVISION_A
)
456 /* Rev A cards return status information from
457 * the base register, which is used for the
458 * temperature in other cards. */
459 control_status
= inb(pcwd_private
.io_addr
);
461 /* Rev C cards return card status in the base
462 * address + 1 register. And use different bits
463 * to indicate a card initiated reset, and an
464 * over-temperature condition. And the reboot
465 * status can be reset. */
466 control_status
= inb(pcwd_private
.io_addr
+ 1);
468 spin_unlock(&pcwd_private
.io_lock
);
470 if (pcwd_private
.revision
== PCWD_REVISION_A
) {
471 if (control_status
& WD_WDRST
)
472 *status
|= WDIOF_CARDRESET
;
474 if (control_status
& WD_T110
) {
475 *status
|= WDIOF_OVERHEAT
;
477 printk (KERN_INFO PFX
"Temperature overheat trip!\n");
479 /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */
483 if (control_status
& WD_REVC_WTRP
)
484 *status
|= WDIOF_CARDRESET
;
486 if (control_status
& WD_REVC_TTRP
) {
487 *status
|= WDIOF_OVERHEAT
;
489 printk (KERN_INFO PFX
"Temperature overheat trip!\n");
491 /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */
499 static int pcwd_clear_status(void)
503 if (pcwd_private
.revision
== PCWD_REVISION_C
) {
504 spin_lock(&pcwd_private
.io_lock
);
506 if (debug
>= VERBOSE
)
507 printk(KERN_INFO PFX
"clearing watchdog trip status\n");
509 control_status
= inb_p(pcwd_private
.io_addr
+ 1);
511 if (debug
>= DEBUG
) {
512 printk(KERN_DEBUG PFX
"status was: 0x%02x\n", control_status
);
513 printk(KERN_DEBUG PFX
"sending: 0x%02x\n",
514 (control_status
& WD_REVC_R2DS
));
517 /* clear reset status & Keep Relay 2 disable state as it is */
518 outb_p((control_status
& WD_REVC_R2DS
), pcwd_private
.io_addr
+ 1);
520 spin_unlock(&pcwd_private
.io_lock
);
525 static int pcwd_get_temperature(int *temperature
)
527 /* check that port 0 gives temperature info and no command results */
528 if (pcwd_private
.command_mode
)
532 if (!pcwd_private
.supports_temp
)
536 * Convert celsius to fahrenheit, since this was
537 * the decided 'standard' for this return value.
539 spin_lock(&pcwd_private
.io_lock
);
540 *temperature
= ((inb(pcwd_private
.io_addr
)) * 9 / 5) + 32;
541 spin_unlock(&pcwd_private
.io_lock
);
543 if (debug
>= DEBUG
) {
544 printk(KERN_DEBUG PFX
"temperature is: %d F\n",
552 * /dev/watchdog handling
555 static int pcwd_ioctl(struct inode
*inode
, struct file
*file
,
556 unsigned int cmd
, unsigned long arg
)
562 int __user
*argp
= (int __user
*)arg
;
563 static struct watchdog_info ident
= {
564 .options
= WDIOF_OVERHEAT
|
566 WDIOF_KEEPALIVEPING
|
569 .firmware_version
= 1,
577 case WDIOC_GETSUPPORT
:
578 if(copy_to_user(argp
, &ident
, sizeof(ident
)))
582 case WDIOC_GETSTATUS
:
583 pcwd_get_status(&status
);
584 return put_user(status
, argp
);
586 case WDIOC_GETBOOTSTATUS
:
587 return put_user(pcwd_private
.boot_status
, argp
);
590 if (pcwd_get_temperature(&temperature
))
593 return put_user(temperature
, argp
);
595 case WDIOC_SETOPTIONS
:
596 if (pcwd_private
.revision
== PCWD_REVISION_C
)
598 if(copy_from_user(&rv
, argp
, sizeof(int)))
601 if (rv
& WDIOS_DISABLECARD
)
606 if (rv
& WDIOS_ENABLECARD
)
611 if (rv
& WDIOS_TEMPPANIC
)
618 case WDIOC_KEEPALIVE
:
622 case WDIOC_SETTIMEOUT
:
623 if (get_user(new_heartbeat
, argp
))
626 if (pcwd_set_heartbeat(new_heartbeat
))
632 case WDIOC_GETTIMEOUT
:
633 return put_user(heartbeat
, argp
);
639 static ssize_t
pcwd_write(struct file
*file
, const char __user
*buf
, size_t len
,
646 /* In case it was set long ago */
649 for (i
= 0; i
!= len
; i
++) {
652 if (get_user(c
, buf
+ i
))
663 static int pcwd_open(struct inode
*inode
, struct file
*file
)
665 if (!atomic_dec_and_test(&open_allowed
) ) {
666 if (debug
>= VERBOSE
)
667 printk(KERN_ERR PFX
"Attempt to open already opened device.\n");
668 atomic_inc( &open_allowed
);
673 __module_get(THIS_MODULE
);
678 return nonseekable_open(inode
, file
);
681 static int pcwd_close(struct inode
*inode
, struct file
*file
)
683 if (expect_close
== 42) {
686 printk(KERN_CRIT PFX
"Unexpected close, not stopping watchdog!\n");
690 atomic_inc( &open_allowed
);
695 * /dev/temperature handling
698 static ssize_t
pcwd_temp_read(struct file
*file
, char __user
*buf
, size_t count
,
703 if (pcwd_get_temperature(&temperature
))
706 if (copy_to_user(buf
, &temperature
, 1))
712 static int pcwd_temp_open(struct inode
*inode
, struct file
*file
)
714 if (!pcwd_private
.supports_temp
)
717 return nonseekable_open(inode
, file
);
720 static int pcwd_temp_close(struct inode
*inode
, struct file
*file
)
729 static int pcwd_notify_sys(struct notifier_block
*this, unsigned long code
, void *unused
)
731 if (code
==SYS_DOWN
|| code
==SYS_HALT
) {
732 /* Turn the WDT off */
743 static const struct file_operations pcwd_fops
= {
744 .owner
= THIS_MODULE
,
749 .release
= pcwd_close
,
752 static struct miscdevice pcwd_miscdev
= {
753 .minor
= WATCHDOG_MINOR
,
758 static const struct file_operations pcwd_temp_fops
= {
759 .owner
= THIS_MODULE
,
761 .read
= pcwd_temp_read
,
762 .open
= pcwd_temp_open
,
763 .release
= pcwd_temp_close
,
766 static struct miscdevice temp_miscdev
= {
768 .name
= "temperature",
769 .fops
= &pcwd_temp_fops
,
772 static struct notifier_block pcwd_notifier
= {
773 .notifier_call
= pcwd_notify_sys
,
777 * Init & exit routines
780 static inline int get_revision(void)
782 int r
= PCWD_REVISION_C
;
784 spin_lock(&pcwd_private
.io_lock
);
785 /* REV A cards use only 2 io ports; test
786 * presumes a floating bus reads as 0xff. */
787 if ((inb(pcwd_private
.io_addr
+ 2) == 0xFF) ||
788 (inb(pcwd_private
.io_addr
+ 3) == 0xFF))
790 spin_unlock(&pcwd_private
.io_lock
);
795 static int __devinit
pcwatchdog_init(int base_addr
)
800 if (cards_found
== 1)
801 printk(KERN_INFO PFX
"v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER
);
803 if (cards_found
> 1) {
804 printk(KERN_ERR PFX
"This driver only supports 1 device\n");
808 if (base_addr
== 0x0000) {
809 printk(KERN_ERR PFX
"No I/O-Address for card detected\n");
812 pcwd_private
.io_addr
= base_addr
;
814 /* Check card's revision */
815 pcwd_private
.revision
= get_revision();
817 if (!request_region(pcwd_private
.io_addr
, (pcwd_private
.revision
== PCWD_REVISION_A
) ? 2 : 4, "PCWD")) {
818 printk(KERN_ERR PFX
"I/O address 0x%04x already in use\n",
819 pcwd_private
.io_addr
);
820 pcwd_private
.io_addr
= 0x0000;
824 /* Initial variables */
825 pcwd_private
.supports_temp
= 0;
827 pcwd_private
.boot_status
= 0x0000;
829 /* get the boot_status */
830 pcwd_get_status(&pcwd_private
.boot_status
);
832 /* clear the "card caused reboot" flag */
835 init_timer(&pcwd_private
.timer
);
836 pcwd_private
.timer
.function
= pcwd_timer_ping
;
837 pcwd_private
.timer
.data
= 0;
839 /* Disable the board */
842 /* Check whether or not the card supports the temperature device */
843 pcwd_check_temperature_support();
845 /* Show info about the card itself */
846 pcwd_show_card_info();
848 /* Check that the heartbeat value is within it's range ; if not reset to the default */
849 if (pcwd_set_heartbeat(heartbeat
)) {
850 pcwd_set_heartbeat(WATCHDOG_HEARTBEAT
);
851 printk(KERN_INFO PFX
"heartbeat value must be 2<=heartbeat<=7200, using %d\n",
855 ret
= register_reboot_notifier(&pcwd_notifier
);
857 printk(KERN_ERR PFX
"cannot register reboot notifier (err=%d)\n",
859 release_region(pcwd_private
.io_addr
, (pcwd_private
.revision
== PCWD_REVISION_A
) ? 2 : 4);
860 pcwd_private
.io_addr
= 0x0000;
864 if (pcwd_private
.supports_temp
) {
865 ret
= misc_register(&temp_miscdev
);
867 printk(KERN_ERR PFX
"cannot register miscdev on minor=%d (err=%d)\n",
869 unregister_reboot_notifier(&pcwd_notifier
);
870 release_region(pcwd_private
.io_addr
, (pcwd_private
.revision
== PCWD_REVISION_A
) ? 2 : 4);
871 pcwd_private
.io_addr
= 0x0000;
876 ret
= misc_register(&pcwd_miscdev
);
878 printk(KERN_ERR PFX
"cannot register miscdev on minor=%d (err=%d)\n",
879 WATCHDOG_MINOR
, ret
);
880 if (pcwd_private
.supports_temp
)
881 misc_deregister(&temp_miscdev
);
882 unregister_reboot_notifier(&pcwd_notifier
);
883 release_region(pcwd_private
.io_addr
, (pcwd_private
.revision
== PCWD_REVISION_A
) ? 2 : 4);
884 pcwd_private
.io_addr
= 0x0000;
888 printk(KERN_INFO PFX
"initialized. heartbeat=%d sec (nowayout=%d)\n",
889 heartbeat
, nowayout
);
894 static void __devexit
pcwatchdog_exit(void)
896 /* Disable the board */
901 misc_deregister(&pcwd_miscdev
);
902 if (pcwd_private
.supports_temp
)
903 misc_deregister(&temp_miscdev
);
904 unregister_reboot_notifier(&pcwd_notifier
);
905 release_region(pcwd_private
.io_addr
, (pcwd_private
.revision
== PCWD_REVISION_A
) ? 2 : 4);
906 pcwd_private
.io_addr
= 0x0000;
911 * The ISA cards have a heartbeat bit in one of the registers, which
912 * register is card dependent. The heartbeat bit is monitored, and if
913 * found, is considered proof that a Berkshire card has been found.
914 * The initial rate is once per second at board start up, then twice
915 * per second for normal operation.
917 static int __init
pcwd_checkcard(int base_addr
)
919 int port0
, last_port0
; /* Reg 0, in case it's REV A */
920 int port1
, last_port1
; /* Register 1 for REV C cards */
924 if (!request_region (base_addr
, 4, "PCWD")) {
925 printk (KERN_INFO PFX
"Port 0x%04x unavailable\n", base_addr
);
931 port0
= inb_p(base_addr
); /* For REV A boards */
932 port1
= inb_p(base_addr
+ 1); /* For REV C boards */
933 if (port0
!= 0xff || port1
!= 0xff) {
934 /* Not an 'ff' from a floating bus, so must be a card! */
935 for (i
= 0; i
< 4; ++i
) {
942 port0
= inb_p(base_addr
);
943 port1
= inb_p(base_addr
+ 1);
945 /* Has either hearbeat bit changed? */
946 if ((port0
^ last_port0
) & WD_HRTBT
||
947 (port1
^ last_port1
) & WD_REVC_HRBT
) {
953 release_region (base_addr
, 4);
959 * These are the auto-probe addresses available.
961 * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350.
962 * Revision A has an address range of 2 addresses, while Revision C has 4.
964 static int pcwd_ioports
[] = { 0x270, 0x350, 0x370, 0x000 };
966 static int __init
pcwd_init_module(void)
970 spin_lock_init(&pcwd_private
.io_lock
);
972 for (i
= 0; pcwd_ioports
[i
] != 0; i
++) {
973 if (pcwd_checkcard(pcwd_ioports
[i
])) {
974 if (!(pcwatchdog_init(pcwd_ioports
[i
])))
980 printk (KERN_INFO PFX
"No card detected, or port not available\n");
987 static void __exit
pcwd_cleanup_module(void)
989 if (pcwd_private
.io_addr
)
992 printk(KERN_INFO PFX
"Watchdog Module Unloaded.\n");
995 module_init(pcwd_init_module
);
996 module_exit(pcwd_cleanup_module
);
998 MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>");
999 MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver");
1000 MODULE_LICENSE("GPL");
1001 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR
);
1002 MODULE_ALIAS_MISCDEV(TEMP_MINOR
);