drivers/watchdog/sbc8360.c

1 // SPDX-License-Identifier: GPL-2.0+
8  *	on acquirewdt.c which is based on wdt.c.
13  *	is based on wdt.c.
15  *	(c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
17  *	Based on acquirewdt.c which is based on wdt.c.
25  *	"AS-IS" and at no charge.
29  *	14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
58  * Watchdog Timer Configuration
60  * The function of the watchdog timer is to reset the system automatically
61  * and is defined at I/O port 0120H and 0121H.  To enable the watchdog timer
63  * below to I/O port 0120H and 0121H.  To disable the timer, write a zero
66  * The following describes how the timer should be programmed (according to
76  * MOV AX,000nH (set multiplier n, from 1-4)
79  * MOV AX,000mH (set base timer m, from 0-F)
83  * Reset timer:
84  * MOV AX,000mH (same as set base timer, above)
96  *	--|----------------------------------
198 MODULE_PARM_DESC(timeout, "Index into timeout table (0-63) (default=27 (60s))");
208 /* Activate and pre-configure watchdog */
225 	/* Write the base timer register */  in sbc8360_ping()
232 	/* De-activate the watchdog */  in sbc8360_stop()
250 					return -EFAULT;  in sbc8360_write()
263 		return -EBUSY;  in sbc8360_open()
330 		pr_err("Invalid timeout index (must be 0-63)\n");  in sbc8360_init()
331 		res = -EINVAL;  in sbc8360_init()
338 		res = -EIO;  in sbc8360_init()
344 		res = -EIO;  in sbc8360_init()