mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-17 07:54:54 +08:00
ef0c1a6b1b
Use helper functions named similar to other drivers to access superio registers. Request memory region only when needed, and use request_muxed_region(). This lets other devices (hwmon, gpio) use the same region. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
299 lines
6.7 KiB
C
299 lines
6.7 KiB
C
/*
|
|
* w83627hf/thf WDT driver
|
|
*
|
|
* (c) Copyright 2013 Guenter Roeck
|
|
* converted to watchdog infrastructure
|
|
*
|
|
* (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
|
|
* added support for W83627THF.
|
|
*
|
|
* (c) Copyright 2003,2007 Pádraig Brady <P@draigBrady.com>
|
|
*
|
|
* Based on advantechwdt.c which is based on wdt.c.
|
|
* Original copyright messages:
|
|
*
|
|
* (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
|
|
*
|
|
* (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
|
|
* warranty for any of this software. This material is provided
|
|
* "AS-IS" and at no charge.
|
|
*
|
|
* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/types.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
|
|
#define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"
|
|
#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
|
|
|
|
/* You must set this - there is no sane way to probe for this board. */
|
|
static int wdt_io = 0x2E;
|
|
module_param(wdt_io, int, 0);
|
|
MODULE_PARM_DESC(wdt_io, "w83627hf/thf WDT io port (default 0x2E)");
|
|
|
|
static int timeout; /* in seconds */
|
|
module_param(timeout, int, 0);
|
|
MODULE_PARM_DESC(timeout,
|
|
"Watchdog timeout in seconds. 1 <= timeout <= 255, default="
|
|
__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
|
|
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout,
|
|
"Watchdog cannot be stopped once started (default="
|
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
|
|
|
/*
|
|
* Kernel methods.
|
|
*/
|
|
|
|
#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */
|
|
#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register
|
|
(same as EFER) */
|
|
#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
|
|
|
|
#define W83627HF_LD_WDT 0x08
|
|
|
|
static void superio_outb(int reg, int val)
|
|
{
|
|
outb(reg, WDT_EFER);
|
|
outb(val, WDT_EFDR);
|
|
}
|
|
|
|
static inline int superio_inb(int reg)
|
|
{
|
|
outb(reg, WDT_EFER);
|
|
return inb(WDT_EFDR);
|
|
}
|
|
|
|
static int superio_enter(void)
|
|
{
|
|
if (!request_muxed_region(wdt_io, 2, WATCHDOG_NAME))
|
|
return -EBUSY;
|
|
|
|
outb_p(0x87, WDT_EFER); /* Enter extended function mode */
|
|
outb_p(0x87, WDT_EFER); /* Again according to manual */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void superio_select(int ld)
|
|
{
|
|
superio_outb(0x07, ld);
|
|
}
|
|
|
|
static void superio_exit(void)
|
|
{
|
|
outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
|
|
release_region(wdt_io, 2);
|
|
}
|
|
|
|
/* tyan motherboards seem to set F5 to 0x4C ?
|
|
* So explicitly init to appropriate value. */
|
|
|
|
static int w83627hf_init(struct watchdog_device *wdog)
|
|
{
|
|
int ret;
|
|
unsigned char t;
|
|
|
|
ret = superio_enter();
|
|
if (ret)
|
|
return ret;
|
|
|
|
superio_select(W83627HF_LD_WDT);
|
|
t = superio_inb(0x20); /* check chip version */
|
|
if (t == 0x82) { /* W83627THF */
|
|
t = (superio_inb(0x2b) & 0xf7);
|
|
superio_outb(0x2b, t | 0x04); /* set GPIO3 to WDT0 */
|
|
} else if (t == 0x88 || t == 0xa0) { /* W83627EHF / W83627DHG */
|
|
t = superio_inb(0x2d);
|
|
superio_outb(0x2d, t & ~0x01); /* set GPIO5 to WDT0 */
|
|
}
|
|
|
|
/* set CR30 bit 0 to activate GPIO2 */
|
|
t = superio_inb(0x30);
|
|
if (!(t & 0x01))
|
|
superio_outb(0x30, t | 0x01);
|
|
|
|
t = superio_inb(0xF6);
|
|
if (t != 0) {
|
|
pr_info("Watchdog already running. Resetting timeout to %d sec\n",
|
|
wdog->timeout);
|
|
superio_outb(0xF6, wdog->timeout);
|
|
}
|
|
|
|
/* set second mode & disable keyboard turning off watchdog */
|
|
t = superio_inb(0xF5) & ~0x0C;
|
|
/* enable the WDTO# output low pulse to the KBRST# pin */
|
|
t |= 0x02;
|
|
superio_outb(0xF5, t);
|
|
|
|
/* disable keyboard & mouse turning off watchdog */
|
|
t = superio_inb(0xF7) & ~0xC0;
|
|
superio_outb(0xF7, t);
|
|
|
|
superio_exit();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wdt_set_time(unsigned int timeout)
|
|
{
|
|
int ret;
|
|
|
|
ret = superio_enter();
|
|
if (ret)
|
|
return ret;
|
|
|
|
superio_select(W83627HF_LD_WDT);
|
|
superio_outb(0xF6, timeout);
|
|
superio_exit();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wdt_start(struct watchdog_device *wdog)
|
|
{
|
|
return wdt_set_time(wdog->timeout);
|
|
}
|
|
|
|
static int wdt_stop(struct watchdog_device *wdog)
|
|
{
|
|
return wdt_set_time(0);
|
|
}
|
|
|
|
static int wdt_set_timeout(struct watchdog_device *wdog, unsigned int timeout)
|
|
{
|
|
wdog->timeout = timeout;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int wdt_get_time(struct watchdog_device *wdog)
|
|
{
|
|
unsigned int timeleft;
|
|
int ret;
|
|
|
|
ret = superio_enter();
|
|
if (ret)
|
|
return 0;
|
|
|
|
superio_select(W83627HF_LD_WDT);
|
|
timeleft = superio_inb(0xF6);
|
|
superio_exit();
|
|
|
|
return timeleft;
|
|
}
|
|
|
|
/*
|
|
* Notifier for system down
|
|
*/
|
|
static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
|
|
void *unused)
|
|
{
|
|
if (code == SYS_DOWN || code == SYS_HALT)
|
|
wdt_set_time(0); /* Turn the WDT off */
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
/*
|
|
* Kernel Interfaces
|
|
*/
|
|
|
|
static struct watchdog_info wdt_info = {
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
|
|
.identity = "W83627HF Watchdog",
|
|
};
|
|
|
|
static struct watchdog_ops wdt_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = wdt_start,
|
|
.stop = wdt_stop,
|
|
.set_timeout = wdt_set_timeout,
|
|
.get_timeleft = wdt_get_time,
|
|
};
|
|
|
|
static struct watchdog_device wdt_dev = {
|
|
.info = &wdt_info,
|
|
.ops = &wdt_ops,
|
|
.timeout = WATCHDOG_TIMEOUT,
|
|
.min_timeout = 1,
|
|
.max_timeout = 255,
|
|
};
|
|
|
|
/*
|
|
* The WDT needs to learn about soft shutdowns in order to
|
|
* turn the timebomb registers off.
|
|
*/
|
|
|
|
static struct notifier_block wdt_notifier = {
|
|
.notifier_call = wdt_notify_sys,
|
|
};
|
|
|
|
static int __init wdt_init(void)
|
|
{
|
|
int ret;
|
|
|
|
pr_info("WDT driver for the Winbond(TM) W83627HF/THF/HG/DHG Super I/O chip initialising\n");
|
|
|
|
watchdog_init_timeout(&wdt_dev, timeout, NULL);
|
|
watchdog_set_nowayout(&wdt_dev, nowayout);
|
|
|
|
ret = w83627hf_init(&wdt_dev);
|
|
if (ret) {
|
|
pr_err("failed to initialize watchdog (err=%d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = register_reboot_notifier(&wdt_notifier);
|
|
if (ret != 0) {
|
|
pr_err("cannot register reboot notifier (err=%d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = watchdog_register_device(&wdt_dev);
|
|
if (ret)
|
|
goto unreg_reboot;
|
|
|
|
pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
|
|
wdt_dev.timeout, nowayout);
|
|
|
|
return ret;
|
|
|
|
unreg_reboot:
|
|
unregister_reboot_notifier(&wdt_notifier);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit wdt_exit(void)
|
|
{
|
|
watchdog_unregister_device(&wdt_dev);
|
|
unregister_reboot_notifier(&wdt_notifier);
|
|
}
|
|
|
|
module_init(wdt_init);
|
|
module_exit(wdt_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>");
|
|
MODULE_DESCRIPTION("w83627hf/thf WDT driver");
|