2 * Watchdog Timer Driver
3 * for ITE IT87xx Environment Control - Low Pin Count Input / Output
5 * (c) Copyright 2007 Oliver Schuster <olivers137@aol.com>
7 * Based on softdog.c by Alan Cox,
8 * 83977f_wdt.c by Jose Goncalves,
9 * it87.c by Chris Gauthron, Jean Delvare
11 * Data-sheets: Publicly available at the ITE website
12 * http://www.ite.com.tw/
14 * Support of the watchdog timers, which are available on
15 * IT8716, IT8718, IT8726 and IT8712 (J,K version).
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34 #include <linux/types.h>
35 #include <linux/kernel.h>
37 #include <linux/miscdevice.h>
38 #include <linux/init.h>
39 #include <linux/ioport.h>
40 #include <linux/watchdog.h>
41 #include <linux/notifier.h>
42 #include <linux/reboot.h>
43 #include <linux/uaccess.h>
46 #include <asm/system.h>
48 #define WATCHDOG_VERSION "1.12"
49 #define WATCHDOG_NAME "IT87 WDT"
50 #define PFX WATCHDOG_NAME ": "
51 #define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n"
54 /* Defaults for Module Parameter */
55 #define DEFAULT_NOGAMEPORT 0
56 #define DEFAULT_EXCLUSIVE 1
57 #define DEFAULT_TIMEOUT 60
58 #define DEFAULT_TESTMODE 0
59 #define DEFAULT_NOWAYOUT WATCHDOG_NOWAYOUT
65 /* Logical device Numbers LDN */
70 /* Configuration Registers and Functions */
78 #define NO_DEV_ID 0xffff
79 #define IT8705_ID 0x8705
80 #define IT8712_ID 0x8712
81 #define IT8716_ID 0x8716
82 #define IT8718_ID 0x8718
83 #define IT8726_ID 0x8726 /* the data sheet suggest wrongly 0x8716 */
85 /* GPIO Configuration Registers LDN=0x07 */
88 #define WDTVALLSB 0x73
89 #define WDTVALMSB 0x74
91 /* GPIO Bits WDTCTRL */
92 #define WDT_CIRINT 0x80
93 #define WDT_MOUSEINT 0x40
94 #define WDT_KYBINT 0x20
95 #define WDT_GAMEPORT 0x10 /* not it8718 */
96 #define WDT_FORCE 0x02
99 /* GPIO Bits WDTCFG */
100 #define WDT_TOV1 0x80
101 #define WDT_KRST 0x40
102 #define WDT_TOVE 0x20
103 #define WDT_PWROK 0x10
104 #define WDT_INT_MASK 0x0f
106 /* CIR Configuration Register LDN=0x0a */
109 /* The default Base address is not always available, we use this */
110 #define CIR_BASE 0x0208
113 #define CIR_DR(b) (b)
114 #define CIR_IER(b) (b + 1)
115 #define CIR_RCR(b) (b + 2)
116 #define CIR_TCR1(b) (b + 3)
117 #define CIR_TCR2(b) (b + 4)
118 #define CIR_TSR(b) (b + 5)
119 #define CIR_RSR(b) (b + 6)
120 #define CIR_BDLR(b) (b + 5)
121 #define CIR_BDHR(b) (b + 6)
122 #define CIR_IIR(b) (b + 7)
124 /* Default Base address of Game port */
125 #define GP_BASE_DEFAULT 0x0201
128 #define WDTS_TIMER_RUN 0
129 #define WDTS_DEV_OPEN 1
130 #define WDTS_KEEPALIVE 2
131 #define WDTS_LOCKED 3
132 #define WDTS_USE_GP 4
133 #define WDTS_EXPECTED 5
135 static unsigned int base, gpact, ciract;
136 static unsigned long wdt_status;
137 static DEFINE_SPINLOCK(spinlock);
139 static int nogameport = DEFAULT_NOGAMEPORT;
140 static int exclusive = DEFAULT_EXCLUSIVE;
141 static int timeout = DEFAULT_TIMEOUT;
142 static int testmode = DEFAULT_TESTMODE;
143 static int nowayout = DEFAULT_NOWAYOUT;
145 module_param(nogameport, int, 0);
146 MODULE_PARM_DESC(nogameport, "Forbid the activation of game port, default="
147 __MODULE_STRING(DEFAULT_NOGAMEPORT));
148 module_param(exclusive, int, 0);
149 MODULE_PARM_DESC(exclusive, "Watchdog exclusive device open, default="
150 __MODULE_STRING(DEFAULT_EXCLUSIVE));
151 module_param(timeout, int, 0);
152 MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, default="
153 __MODULE_STRING(DEFAULT_TIMEOUT));
154 module_param(testmode, int, 0);
155 MODULE_PARM_DESC(testmode, "Watchdog test mode (1 = no reboot), default="
156 __MODULE_STRING(DEFAULT_TESTMODE));
157 module_param(nowayout, int, 0);
158 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started, default="
159 __MODULE_STRING(WATCHDOG_NOWAYOUT));
163 static inline void superio_enter(void)
171 static inline void superio_exit(void)
177 static inline void superio_select(int ldn)
183 static inline int superio_inb(int reg)
189 static inline void superio_outb(int val, int reg)
195 static inline int superio_inw(int reg)
205 static inline void superio_outw(int val, int reg)
213 /* watchdog timer handling */
215 static void wdt_keepalive(void)
217 if (test_bit(WDTS_USE_GP, &wdt_status))
220 /* The timer reloads with around 5 msec delay */
221 outb(0x55, CIR_DR(base));
222 set_bit(WDTS_KEEPALIVE, &wdt_status);
225 static void wdt_start(void)
229 spin_lock_irqsave(&spinlock, flags);
232 superio_select(GPIO);
233 if (test_bit(WDTS_USE_GP, &wdt_status))
234 superio_outb(WDT_GAMEPORT, WDTCTRL);
236 superio_outb(WDT_CIRINT, WDTCTRL);
238 superio_outb(WDT_TOV1 | WDT_KRST | WDT_PWROK, WDTCFG);
240 superio_outb(WDT_TOV1, WDTCFG);
241 superio_outb(timeout>>8, WDTVALMSB);
242 superio_outb(timeout, WDTVALLSB);
245 spin_unlock_irqrestore(&spinlock, flags);
248 static void wdt_stop(void)
252 spin_lock_irqsave(&spinlock, flags);
255 superio_select(GPIO);
256 superio_outb(0x00, WDTCTRL);
257 superio_outb(WDT_TOV1, WDTCFG);
258 superio_outb(0x00, WDTVALMSB);
259 superio_outb(0x00, WDTVALLSB);
262 spin_unlock_irqrestore(&spinlock, flags);
266 * wdt_set_timeout - set a new timeout value with watchdog ioctl
267 * @t: timeout value in seconds
269 * The hardware device has a 16 bit watchdog timer, thus the
270 * timeout time ranges between 1 and 65535 seconds.
272 * Used within WDIOC_SETTIMEOUT watchdog device ioctl.
275 static int wdt_set_timeout(int t)
279 if (t < 1 || t > 65535)
284 spin_lock_irqsave(&spinlock, flags);
285 if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
288 superio_select(GPIO);
289 superio_outb(t>>8, WDTVALMSB);
290 superio_outb(t, WDTVALLSB);
294 spin_unlock_irqrestore(&spinlock, flags);
299 * wdt_get_status - determines the status supported by watchdog ioctl
300 * @status: status returned to user space
302 * The status bit of the device does not allow to distinguish
303 * between a regular system reset and a watchdog forced reset.
304 * But, in test mode it is useful, so it is supported through
305 * WDIOC_GETSTATUS watchdog ioctl. Additionally the driver
306 * reports the keepalive signal and the acception of the magic.
308 * Used within WDIOC_GETSTATUS watchdog device ioctl.
311 static int wdt_get_status(int *status)
317 spin_lock_irqsave(&spinlock, flags);
319 superio_select(GPIO);
320 if (superio_inb(WDTCTRL) & WDT_ZERO) {
321 superio_outb(0x00, WDTCTRL);
322 clear_bit(WDTS_TIMER_RUN, &wdt_status);
323 *status |= WDIOF_CARDRESET;
327 spin_unlock_irqrestore(&spinlock, flags);
329 if (test_and_clear_bit(WDTS_KEEPALIVE, &wdt_status))
330 *status |= WDIOF_KEEPALIVEPING;
331 if (test_bit(WDTS_EXPECTED, &wdt_status))
332 *status |= WDIOF_MAGICCLOSE;
336 /* /dev/watchdog handling */
339 * wdt_open - watchdog file_operations .open
340 * @inode: inode of the device
341 * @file: file handle to the device
343 * The watchdog timer starts by opening the device.
345 * Used within the file operation of the watchdog device.
348 static int wdt_open(struct inode *inode, struct file *file)
350 if (exclusive && test_and_set_bit(WDTS_DEV_OPEN, &wdt_status))
352 if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) {
353 if (nowayout && !test_and_set_bit(WDTS_LOCKED, &wdt_status))
354 __module_get(THIS_MODULE);
357 return nonseekable_open(inode, file);
361 * wdt_release - watchdog file_operations .release
362 * @inode: inode of the device
363 * @file: file handle to the device
365 * Closing the watchdog device either stops the watchdog timer
366 * or in the case, that nowayout is set or the magic character
367 * wasn't written, a critical warning about an running watchdog
370 * Used within the file operation of the watchdog device.
373 static int wdt_release(struct inode *inode, struct file *file)
375 if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
376 if (test_and_clear_bit(WDTS_EXPECTED, &wdt_status)) {
378 clear_bit(WDTS_TIMER_RUN, &wdt_status);
382 "unexpected close, not stopping watchdog!\n");
385 clear_bit(WDTS_DEV_OPEN, &wdt_status);
390 * wdt_write - watchdog file_operations .write
391 * @file: file handle to the watchdog
392 * @buf: buffer to write
393 * @count: count of bytes
394 * @ppos: pointer to the position to write. No seeks allowed
396 * A write to a watchdog device is defined as a keepalive signal. Any
397 * write of data will do, as we don't define content meaning.
399 * Used within the file operation of the watchdog device.
402 static ssize_t wdt_write(struct file *file, const char __user *buf,
403 size_t count, loff_t *ppos)
406 clear_bit(WDTS_EXPECTED, &wdt_status);
412 /* note: just in case someone wrote the magic character long ago */
413 for (ofs = 0; ofs != count; ofs++) {
415 if (get_user(c, buf + ofs))
418 set_bit(WDTS_EXPECTED, &wdt_status);
424 static struct watchdog_info ident = {
425 .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
426 .firmware_version = 1,
427 .identity = WATCHDOG_NAME,
431 * wdt_ioctl - watchdog file_operations .unlocked_ioctl
432 * @file: file handle to the device
433 * @cmd: watchdog command
434 * @arg: argument pointer
436 * The watchdog API defines a common set of functions for all watchdogs
437 * according to their available features.
439 * Used within the file operation of the watchdog device.
442 static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
444 int rc = 0, status, new_options, new_timeout;
446 struct watchdog_info __user *ident;
450 uarg.i = (int __user *)arg;
453 case WDIOC_GETSUPPORT:
454 return copy_to_user(uarg.ident,
455 &ident, sizeof(ident)) ? -EFAULT : 0;
457 case WDIOC_GETSTATUS:
458 wdt_get_status(&status);
459 return put_user(status, uarg.i);
461 case WDIOC_GETBOOTSTATUS:
462 return put_user(0, uarg.i);
464 case WDIOC_KEEPALIVE:
468 case WDIOC_SETOPTIONS:
469 if (get_user(new_options, uarg.i))
472 switch (new_options) {
473 case WDIOS_DISABLECARD:
474 if (test_bit(WDTS_TIMER_RUN, &wdt_status))
476 clear_bit(WDTS_TIMER_RUN, &wdt_status);
479 case WDIOS_ENABLECARD:
480 if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status))
488 case WDIOC_SETTIMEOUT:
489 if (get_user(new_timeout, uarg.i))
491 rc = wdt_set_timeout(new_timeout);
492 case WDIOC_GETTIMEOUT:
493 if (put_user(timeout, uarg.i))
502 static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
505 if (code == SYS_DOWN || code == SYS_HALT)
510 static const struct file_operations wdt_fops = {
511 .owner = THIS_MODULE,
514 .unlocked_ioctl = wdt_ioctl,
516 .release = wdt_release,
519 static struct miscdevice wdt_miscdev = {
520 .minor = WATCHDOG_MINOR,
525 static struct notifier_block wdt_notifier = {
526 .notifier_call = wdt_notify_sys,
529 static int __init it87_wdt_init(void)
536 spin_lock_irqsave(&spinlock, flags);
538 chip_type = superio_inw(CHIPID);
539 chip_rev = superio_inb(CHIPREV) & 0x0f;
541 spin_unlock_irqrestore(&spinlock, flags);
553 "Unsupported Chip found, Chip %04x Revision %02x\n",
554 chip_type, chip_rev);
557 printk(KERN_ERR PFX "no device\n");
561 "Unknown Chip found, Chip %04x Revision %04x\n",
562 chip_type, chip_rev);
566 spin_lock_irqsave(&spinlock, flags);
569 superio_select(GPIO);
570 superio_outb(WDT_TOV1, WDTCFG);
571 superio_outb(0x00, WDTCTRL);
573 /* First try to get Gameport support */
574 if (chip_type != IT8718_ID && !nogameport) {
575 superio_select(GAMEPORT);
576 base = superio_inw(BASEREG);
578 base = GP_BASE_DEFAULT;
579 superio_outw(base, BASEREG);
581 gpact = superio_inb(ACTREG);
582 superio_outb(0x01, ACTREG);
584 spin_unlock_irqrestore(&spinlock, flags);
585 if (request_region(base, 1, WATCHDOG_NAME))
586 set_bit(WDTS_USE_GP, &wdt_status);
591 spin_unlock_irqrestore(&spinlock, flags);
594 /* If we haven't Gameport support, try to get CIR support */
595 if (!test_bit(WDTS_USE_GP, &wdt_status)) {
596 if (!request_region(CIR_BASE, 8, WATCHDOG_NAME)) {
599 "I/O Address 0x%04x and 0x%04x"
600 " already in use\n", base, CIR_BASE);
603 "I/O Address 0x%04x already in use\n",
609 spin_lock_irqsave(&spinlock, flags);
613 superio_outw(base, BASEREG);
614 superio_outb(0x00, CIR_ILS);
615 ciract = superio_inb(ACTREG);
616 superio_outb(0x01, ACTREG);
618 superio_select(GAMEPORT);
619 superio_outb(gpact, ACTREG);
623 spin_unlock_irqrestore(&spinlock, flags);
626 if (timeout < 1 || timeout > 65535) {
627 timeout = DEFAULT_TIMEOUT;
628 printk(KERN_WARNING PFX
629 "Timeout value out of range, use default %d sec\n",
633 rc = register_reboot_notifier(&wdt_notifier);
636 "Cannot register reboot notifier (err=%d)\n", rc);
640 rc = misc_register(&wdt_miscdev);
643 "Cannot register miscdev on minor=%d (err=%d)\n",
644 wdt_miscdev.minor, rc);
648 /* Initialize CIR to use it as keepalive source */
649 if (!test_bit(WDTS_USE_GP, &wdt_status)) {
650 outb(0x00, CIR_RCR(base));
651 outb(0xc0, CIR_TCR1(base));
652 outb(0x5c, CIR_TCR2(base));
653 outb(0x10, CIR_IER(base));
654 outb(0x00, CIR_BDHR(base));
655 outb(0x01, CIR_BDLR(base));
656 outb(0x09, CIR_IER(base));
659 printk(KERN_INFO PFX "Chip it%04x revision %d initialized. "
660 "timeout=%d sec (nowayout=%d testmode=%d exclusive=%d "
661 "nogameport=%d)\n", chip_type, chip_rev, timeout,
662 nowayout, testmode, exclusive, nogameport);
667 unregister_reboot_notifier(&wdt_notifier);
669 release_region(base, test_bit(WDTS_USE_GP, &wdt_status) ? 1 : 8);
670 if (!test_bit(WDTS_USE_GP, &wdt_status)) {
671 spin_lock_irqsave(&spinlock, flags);
674 superio_outb(ciract, ACTREG);
676 spin_unlock_irqrestore(&spinlock, flags);
679 if (chip_type != IT8718_ID && !nogameport) {
680 spin_lock_irqsave(&spinlock, flags);
682 superio_select(GAMEPORT);
683 superio_outb(gpact, ACTREG);
685 spin_unlock_irqrestore(&spinlock, flags);
691 static void __exit it87_wdt_exit(void)
696 nolock = !spin_trylock_irqsave(&spinlock, flags);
698 superio_select(GPIO);
699 superio_outb(0x00, WDTCTRL);
700 superio_outb(0x00, WDTCFG);
701 superio_outb(0x00, WDTVALMSB);
702 superio_outb(0x00, WDTVALLSB);
703 if (test_bit(WDTS_USE_GP, &wdt_status)) {
704 superio_select(GAMEPORT);
705 superio_outb(gpact, ACTREG);
708 superio_outb(ciract, ACTREG);
712 spin_unlock_irqrestore(&spinlock, flags);
714 misc_deregister(&wdt_miscdev);
715 unregister_reboot_notifier(&wdt_notifier);
716 release_region(base, test_bit(WDTS_USE_GP, &wdt_status) ? 1 : 8);
719 module_init(it87_wdt_init);
720 module_exit(it87_wdt_exit);
722 MODULE_AUTHOR("Oliver Schuster");
723 MODULE_DESCRIPTION("Hardware Watchdog Device Driver for IT87xx EC-LPC I/O");
724 MODULE_LICENSE("GPL");
725 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);