drivers/watchdog/wdt.c

1 // SPDX-License-Identifier: GPL-2.0+
5  *	(c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
10  *	"AS-IS" and at no charge.
71 /* You must set these - there is no sane way to probe for this board. */
82 /* Support for the Fan Tachometer on the WDT501-P */
86 		"WDT501-P Fan Tachometer support (0=disable, default=0)");
91 		"WDT501-P Card type (500 or 501, default=500)");
97 static void wdt_ctr_mode(int ctr, int mode)  in wdt_ctr_mode()  argument
99 	ctr <<= 6;  in wdt_ctr_mode()
100 	ctr |= 0x30;  in wdt_ctr_mode()
101 	ctr |= (mode << 1);  in wdt_ctr_mode()
102 	outb_p(ctr, WDT_CR);  in wdt_ctr_mode()
105 static void wdt_ctr_load(int ctr, int val)  in wdt_ctr_load()  argument
107 	outb_p(val&0xFF, WDT_COUNT0+ctr);  in wdt_ctr_load()
108 	outb_p(val>>8, WDT_COUNT0+ctr);  in wdt_ctr_load()
166 	wdt_ctr_mode(1, 2);		/* Re-Program CTR1 for Mode 2:  in wdt_ping()
178  *	value is incorrect we keep the old value and return -EINVAL. If
185 		return -EINVAL;  in wdt_set_heartbeat()
196  *	several board variants so we have to know which bits are valid. Some
197  *	bits default to one and some to zero in order to be maximally painful.
199  *	we then map the bits onto the status ioctl flags.
330 					return -EFAULT;  in wdt_write()
377 		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;  in wdt_ioctl()
388 			return -EFAULT;  in wdt_ioctl()
390 			return -EINVAL;  in wdt_ioctl()
396 		return -ENOTTY;  in wdt_ioctl()
415 		return -EBUSY;  in wdt_open()
465 		return -EFAULT;  in wdt_temp_read()
505  *	trust me - if it happens it does suck.
564  *	will not touch PC memory so all is fine. You just have to load a new
592 		return -ENODEV;  in wdt_init()
605 		ret = -EBUSY;  in wdt_init()
637 	pr_info("WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n",  in wdt_init()