1 // SPDX-License-Identifier: GPL-2.0-only
10  * 960108	Fixed end-of-file pointer (Thanks to Dan Hollis), added
24  *		added watchdog disable/re-enable routines.  Added firmware
26  *		Removed some extra defines, added an autodetect Revision
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.
96  * Revision A only uses ports 0x270 and 0x370.  Revision C introduced 0x350.
97  * Revision A has an address range of 2 addresses, while Revision C has 4.
104  * PCI-PC Watchdog card.
106 /* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */
112 /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */
117 							on-board processor */
125 							(1:SW1 <-> 0:SW2) */
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 */
176 /* this is private data for each ISA-PC watchdog card */
179 	int revision;			/* The card's revision */  member
200 /* default heartbeat = delay-time from dip-switches */
205 	"(2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default="
336 	if (pcwd_private.revision == PCWD_REVISION_A)  in pcwd_show_card_info()
337 		pr_info("ISA-PC Watchdog (REV.A) detected at port 0x%04x\n",  in pcwd_show_card_info()
339 	else if (pcwd_private.revision == PCWD_REVISION_C) {  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()
368 		pr_info("No previous trip detected - Cold boot or reset\n");  in pcwd_show_card_info()
380 		if (pcwd_private.revision == PCWD_REVISION_A) {  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()
412 	if (pcwd_private.revision == PCWD_REVISION_C) {  in pcwd_start()
420 			return -EIO;  in pcwd_start()
438 	if (pcwd_private.revision == PCWD_REVISION_C) {  in pcwd_stop()
448 			return -EIO;  in pcwd_stop()
472 		return -EINVAL;  in pcwd_set_heartbeat()
488 	if (pcwd_private.revision == PCWD_REVISION_A)  in pcwd_get_status()
497 		 * over-temperature condition. And the reboot  in pcwd_get_status()
503 	if (pcwd_private.revision == PCWD_REVISION_A) {  in pcwd_get_status()
534 	if (pcwd_private.revision == PCWD_REVISION_C) {  in pcwd_clear_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()
623 		if (pcwd_private.revision == PCWD_REVISION_C) {  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()
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()
804 static int pcwd_isa_match(struct device *dev, unsigned int id)  in pcwd_isa_match()  argument
806 	int base_addr = pcwd_ioports[id];  in pcwd_isa_match()
813 		pr_debug("pcwd_isa_match id=%d\n", id);  in pcwd_isa_match()
849 static int pcwd_isa_probe(struct device *dev, unsigned int id)  in pcwd_isa_probe()  argument
854 		pr_debug("pcwd_isa_probe id=%d\n", id);  in pcwd_isa_probe()
863 		return -ENODEV;  in pcwd_isa_probe()
866 	if (pcwd_ioports[id] == 0x0000) {  in pcwd_isa_probe()
867 		pr_err("No I/O-Address for card detected\n");  in pcwd_isa_probe()
868 		return -ENODEV;  in pcwd_isa_probe()
870 	pcwd_private.io_addr = pcwd_ioports[id];  in pcwd_isa_probe()
874 	/* Check card's revision */  in pcwd_isa_probe()
875 	pcwd_private.revision = get_revision();  in pcwd_isa_probe()
878 		(pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {  in pcwd_isa_probe()
881 		ret = -EIO;  in pcwd_isa_probe()
907 	/* If heartbeat = 0 then we use the heartbeat from the dip-switches */  in pcwd_isa_probe()
945 			(pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);  in pcwd_isa_probe()
948 	cards_found--;  in pcwd_isa_probe()
952 static void pcwd_isa_remove(struct device *dev, unsigned int id)  in pcwd_isa_remove()  argument
955 		pr_debug("pcwd_isa_remove id=%d\n", id);  in pcwd_isa_remove()
966 			(pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);  in pcwd_isa_remove()
968 	cards_found--;  in pcwd_isa_remove()
971 static void pcwd_isa_shutdown(struct device *dev, unsigned int id)  in pcwd_isa_shutdown()  argument
974 		pr_debug("pcwd_isa_shutdown id=%d\n", id);  in pcwd_isa_shutdown()
994 MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver");