22 #include <linux/watchdog.h>
26 #define SIO_F71808FG_LD_WDT	0x07	/* Watchdog timer logical device */
76 					   watchdog signal */
77 #define WATCHDOG_F71862FG_PIN	63	/* default watchdog reset output
88 	"Watchdog timeout in seconds. 1<= timeout <="
95 	"Watchdog signal pulse width. 0(=level), 1, 25, 30, 125, 150, 5000 or 6000 ms"
101 	"Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
106 MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
110 MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
152 	char		caused_reboot;	/* last reboot was by the watchdog */
155 static struct watchdog_data watchdog = {  variable
156 	.lock = __MUTEX_INITIALIZER(watchdog.lock),
225 		pr_err("watchdog timeout out of range\n");  in watchdog_set_timeout()
229 	mutex_lock(&watchdog.lock);  in watchdog_set_timeout()
231 	watchdog.timeout = timeout;  in watchdog_set_timeout()
233 		watchdog.timer_val = DIV_ROUND_UP(timeout, 60);  in watchdog_set_timeout()
234 		watchdog.minutes_mode = true;  in watchdog_set_timeout()
236 		watchdog.timer_val = timeout;  in watchdog_set_timeout()
237 		watchdog.minutes_mode = false;  in watchdog_set_timeout()
240 	mutex_unlock(&watchdog.lock);  in watchdog_set_timeout()
250 	if (watchdog.type == f71868) {  in watchdog_set_pulse_width()
256 	mutex_lock(&watchdog.lock);  in watchdog_set_pulse_width()
259 		watchdog.pulse_val = 0;  in watchdog_set_pulse_width()
261 		watchdog.pulse_val = 1;  in watchdog_set_pulse_width()
263 		watchdog.pulse_val = 2;  in watchdog_set_pulse_width()
265 		watchdog.pulse_val = 3;  in watchdog_set_pulse_width()
272 	watchdog.pulse_mode = pw;  in watchdog_set_pulse_width()
275 	mutex_unlock(&watchdog.lock);  in watchdog_set_pulse_width()
283 	mutex_lock(&watchdog.lock);  in watchdog_keepalive()
284 	err = superio_enter(watchdog.sioaddr);  in watchdog_keepalive()
287 	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);  in watchdog_keepalive()
289 	if (watchdog.minutes_mode)  in watchdog_keepalive()
291 		superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,  in watchdog_keepalive()
295 		superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,  in watchdog_keepalive()
299 	superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,  in watchdog_keepalive()
300 			   watchdog.timer_val);  in watchdog_keepalive()
302 	superio_exit(watchdog.sioaddr);  in watchdog_keepalive()
305 	mutex_unlock(&watchdog.lock);  in watchdog_keepalive()
314 	/* Make sure we don't die as soon as the watchdog is enabled below */  in watchdog_start()
319 	mutex_lock(&watchdog.lock);  in watchdog_start()
320 	err = superio_enter(watchdog.sioaddr);  in watchdog_start()
323 	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);  in watchdog_start()
325 	/* Watchdog pin configuration */  in watchdog_start()
326 	switch (watchdog.type) {  in watchdog_start()
329 		superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3);  in watchdog_start()
330 		superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3);  in watchdog_start()
336 			superio_clear_bit(watchdog.sioaddr, SIO_REG_ROM_ADDR_SEL, 6);  in watchdog_start()
337 			superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 4);  in watchdog_start()
339 			superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);  in watchdog_start()
346 		superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 4);  in watchdog_start()
351 		superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);  in watchdog_start()
356 		superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3,  in watchdog_start()
357 			superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf);  in watchdog_start()
362 		superio_clear_bit(watchdog.sioaddr, SIO_REG_CLOCK_SEL, 3);  in watchdog_start()
364 		superio_outb(watchdog.sioaddr, SIO_REG_TSI_LEVEL_SEL, 0x5f &  in watchdog_start()
365 			superio_inb(watchdog.sioaddr, SIO_REG_TSI_LEVEL_SEL));  in watchdog_start()
370 		superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 5);  in watchdog_start()
380 		tmp = superio_inb(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL);  in watchdog_start()
383 		superio_outb(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL, tmp);  in watchdog_start()
385 		superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_GPIO1, 5);  in watchdog_start()
397 	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);  in watchdog_start()
398 	superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);  in watchdog_start()
400 	if (watchdog.type == f81865 || watchdog.type == f81866)  in watchdog_start()
401 		superio_set_bit(watchdog.sioaddr, F81865_REG_WDO_CONF,  in watchdog_start()
404 		superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,  in watchdog_start()
407 	superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,  in watchdog_start()
410 	if (watchdog.pulse_mode) {  in watchdog_start()
412 		u8 wdt_conf = superio_inb(watchdog.sioaddr,  in watchdog_start()
416 		wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);  in watchdog_start()
420 		superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,  in watchdog_start()
424 		superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,  in watchdog_start()
429 	superio_exit(watchdog.sioaddr);  in watchdog_start()
431 	mutex_unlock(&watchdog.lock);  in watchdog_start()
440 	mutex_lock(&watchdog.lock);  in watchdog_stop()
441 	err = superio_enter(watchdog.sioaddr);  in watchdog_stop()
444 	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);  in watchdog_stop()
446 	superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,  in watchdog_stop()
449 	superio_exit(watchdog.sioaddr);  in watchdog_stop()
452 	mutex_unlock(&watchdog.lock);  in watchdog_stop()
461 	mutex_lock(&watchdog.lock);  in watchdog_get_status()
462 	status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;  in watchdog_get_status()
463 	mutex_unlock(&watchdog.lock);  in watchdog_get_status()
471 	 * if we fail to determine the watchdog's status assume it to be  in watchdog_is_running()
476 	mutex_lock(&watchdog.lock);  in watchdog_is_running()
477 	if (superio_enter(watchdog.sioaddr))  in watchdog_is_running()
479 	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);  in watchdog_is_running()
481 	is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))  in watchdog_is_running()
482 		&& (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)  in watchdog_is_running()
485 	superio_exit(watchdog.sioaddr);  in watchdog_is_running()
488 	mutex_unlock(&watchdog.lock);  in watchdog_is_running()
492 /* /dev/watchdog api */
498 	/* If the watchdog is alive we don't need to start it again */  in watchdog_open()
499 	if (test_and_set_bit(0, &watchdog.opened))  in watchdog_open()
504 		clear_bit(0, &watchdog.opened);  in watchdog_open()
511 	watchdog.expect_close = 0;  in watchdog_open()
517 	clear_bit(0, &watchdog.opened);  in watchdog_release()
519 	if (!watchdog.expect_close) {  in watchdog_release()
521 		pr_crit("Unexpected close, not stopping watchdog!\n");  in watchdog_release()
530  *      @file: file handle to the watchdog
535  *      A write to a watchdog device is defined as a keepalive signal. Any
558 			mutex_lock(&watchdog.lock);  in watchdog_write()
559 			watchdog.expect_close = expect_close;  in watchdog_write()
560 			mutex_unlock(&watchdog.lock);  in watchdog_write()
573  *      @cmd: watchdog command
576  *      The watchdog API defines a common set of functions for all watchdogs
594 		return copy_to_user(uarg.ident, &watchdog.ident,  in watchdog_ioctl()
595 			sizeof(watchdog.ident)) ? -EFAULT : 0;  in watchdog_ioctl()
632 		return put_user(watchdog.timeout, uarg.i);  in watchdog_ioctl()
660 	.name		= "watchdog",
672 	/* No need to lock watchdog.lock here because no entry points  in watchdog_init()
675 	watchdog.sioaddr = sioaddr;  in watchdog_init()
676 	watchdog.ident.options = WDIOF_MAGICCLOSE  in watchdog_init()
680 	snprintf(watchdog.ident.identity,  in watchdog_init()
681 		sizeof(watchdog.ident.identity), "%s watchdog",  in watchdog_init()
682 		f71808e_names[watchdog.type]);  in watchdog_init()
687 	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);  in watchdog_init()
690 	watchdog.caused_reboot = wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS);  in watchdog_init()
729 			pr_err("cannot start watchdog timer\n");  in watchdog_init()
733 		mutex_lock(&watchdog.lock);  in watchdog_init()
737 		superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);  in watchdog_init()
754 		mutex_unlock(&watchdog.lock);  in watchdog_init()
759 		pr_info("watchdog started with initial timeout of %u sec\n",  in watchdog_init()
766 	mutex_unlock(&watchdog.lock);  in watchdog_init()
792 		watchdog.type = f71808fg;  in f71808e_find()
795 		watchdog.type = f71862fg;  in f71808e_find()
798 		watchdog.type = f71868;  in f71808e_find()
802 		watchdog.type = f71869;  in f71808e_find()
805 		watchdog.type = f71882fg;  in f71808e_find()
808 		watchdog.type = f71889fg;  in f71808e_find()
811 		/* Confirmed (by datasheet) not to have a watchdog. */  in f71808e_find()
815 		watchdog.type = f81803;  in f71808e_find()
818 		watchdog.type = f81865;  in f71808e_find()
821 		watchdog.type = f81866;  in f71808e_find()
830 	pr_info("Found %s watchdog chip, revision %d\n",  in f71808e_find()
831 		f71808e_names[watchdog.type],  in f71808e_find()
863 		pr_warn("Watchdog timer still running, stopping it\n");  in f71808e_exit()
870 MODULE_DESCRIPTION("F71808E Watchdog Driver");