1 // SPDX-License-Identifier: GPL-2.0-only
10  * 960108	Fixed end-of-file pointer (Thanks to Dan Hollis), added
20  *		typedefs to replace them.  Made heartbeat reset only available
24  *		added watchdog disable/re-enable routines.  Added firmware
60 #include <linux/errno.h>	/* For the -ENODEV/... values */
71 #include <linux/ioport.h>	/* For io-port access */
79 #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog"
94  * These are the auto-probe addresses available.
104  * PCI-PC Watchdog card.
109 #define WD_HRTBT		0x04	/* Heartbeat sense */
114 #define WD_REVC_HRBT		0x02	/* Watchdog Heartbeat */
117 							on-board processor */
125 							(1:SW1 <-> 0:SW2) */
128 /* max. time we give an ISA watchdog card to process a command */
148 /* Watchdog's Dip Switch heartbeat values */
150 	20,	/* OFF-OFF-OFF	= 20 Sec  */
151 	40,	/* OFF-OFF-ON	= 40 Sec  */
152 	60,	/* OFF-ON-OFF	=  1 Min  */
153 	300,	/* OFF-ON-ON	=  5 Min  */
154 	600,	/* ON-OFF-OFF	= 10 Min  */
155 	1800,	/* ON-OFF-ON	= 30 Min  */
156 	3600,	/* ON-ON-OFF	=  1 Hour */
157 	7200,	/* ON-ON-ON	=  2 hour */
162  * every ~500ms. We try to set the internal heartbeat of the
176 /* this is private data for each ISA-PC watchdog card */
200 /* default heartbeat = delay-time from dip-switches */
202 static int heartbeat = WATCHDOG_HEARTBEAT;  variable
203 module_param(heartbeat, int, 0);
204 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
205 	"(2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default="
337 		pr_info("ISA-PC Watchdog (REV.A) detected at port 0x%04x\n",  in pcwd_show_card_info()
341 		pr_info("ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n",  in pcwd_show_card_info()
349 		/* Reprogram internal heartbeat to 2 seconds */  in pcwd_show_card_info()
368 		pr_info("No previous trip detected - Cold boot or reset\n");  in pcwd_show_card_info()
375 	/* If we got a heartbeat pulse within the WDT_INTERVAL  in pcwd_timer_ping()
389 			/* Re-trigger watchdog by writing to port 0 */  in pcwd_timer_ping()
393 		/* Re-set the timer interval */  in pcwd_timer_ping()
398 		pr_warn("Heartbeat lost! Will not ping the watchdog\n");  in pcwd_timer_ping()
406 	pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);  in pcwd_start()
420 			return -EIO;  in pcwd_start()
448 			return -EIO;  in pcwd_stop()
461 	pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);  in pcwd_keepalive()
472 		return -EINVAL;  in pcwd_set_heartbeat()
474 	heartbeat = t;  in pcwd_set_heartbeat()
477 		pr_debug("New heartbeat: %d\n", heartbeat);  in pcwd_set_heartbeat()
497 		 * over-temperature condition. And the reboot  in pcwd_get_status()
561 		return -1;  in pcwd_get_temperature()
565 		return -ENODEV;  in pcwd_get_temperature()
606 			return -EFAULT;  in pcwd_ioctl()
618 			return -EFAULT;  in pcwd_ioctl()
625 				return -EFAULT;  in pcwd_ioctl()
640 		return -EINVAL;  in pcwd_ioctl()
648 			return -EFAULT;  in pcwd_ioctl()
651 			return -EINVAL;  in pcwd_ioctl()
657 		return put_user(heartbeat, argp);  in pcwd_ioctl()
660 		return -ENOTTY;  in pcwd_ioctl()
680 					return -EFAULT;  in pcwd_write()
693 		return -EBUSY;  in pcwd_open()
725 		return -EFAULT;  in pcwd_temp_read()
728 		return -EFAULT;  in pcwd_temp_read()
736 		return -ENODEV;  in pcwd_temp_open()
800  *  The ISA cards have a heartbeat bit in one of the registers, which
801  *  register is card dependent.  The heartbeat bit is monitored, and if
865 		return -ENODEV;  in pcwd_isa_probe()
869 		pr_err("No I/O-Address for card detected\n");  in pcwd_isa_probe()
870 		return -ENODEV;  in pcwd_isa_probe()
883 		ret = -EIO;  in pcwd_isa_probe()
909 	/* If heartbeat = 0 then we use the heartbeat from the dip-switches */  in pcwd_isa_probe()
910 	if (heartbeat == 0)  in pcwd_isa_probe()
911 		heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)];  in pcwd_isa_probe()
913 	/* Check that the heartbeat value is within it's range;  in pcwd_isa_probe()
915 	if (pcwd_set_heartbeat(heartbeat)) {  in pcwd_isa_probe()
917 		pr_info("heartbeat value must be 2 <= heartbeat <= 7200, using %d\n",  in pcwd_isa_probe()
937 	pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",  in pcwd_isa_probe()
938 		heartbeat, nowayout);  in pcwd_isa_probe()
950 	cards_found--;  in pcwd_isa_probe()
970 	cards_found--;  in pcwd_isa_remove()
996 MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver");