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|
/*
* 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 */
static int wdt_io;
static int cr_wdt_timeout; /* WDT timeout register */
static int cr_wdt_control; /* WDT control register */
enum chips { w83627hf, w83627s, w83697hf, w83697ug, w83637hf, w83627thf,
w83687thf, w83627ehf, w83627dhg, w83627uhg, w83667hg, w83627dhg_p,
w83667hg_b, nct6775, nct6776, nct6779, nct6791, nct6792 };
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) ")");
static int early_disable;
module_param(early_disable, int, 0);
MODULE_PARM_DESC(early_disable, "Disable watchdog at boot time (default=0)");
/*
* 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
#define W83627HF_ID 0x52
#define W83627S_ID 0x59
#define W83697HF_ID 0x60
#define W83697UG_ID 0x68
#define W83637HF_ID 0x70
#define W83627THF_ID 0x82
#define W83687THF_ID 0x85
#define W83627EHF_ID 0x88
#define W83627DHG_ID 0xa0
#define W83627UHG_ID 0xa2
#define W83667HG_ID 0xa5
#define W83627DHG_P_ID 0xb0
#define W83667HG_B_ID 0xb3
#define NCT6775_ID 0xb4
#define NCT6776_ID 0xc3
#define NCT6779_ID 0xc5
#define NCT6791_ID 0xc8
#define NCT6792_ID 0xc9
#define W83627HF_WDT_TIMEOUT 0xf6
#define W83697HF_WDT_TIMEOUT 0xf4
#define W83627HF_WDT_CONTROL 0xf5
#define W83697HF_WDT_CONTROL 0xf3
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);
}
static int w83627hf_init(struct watchdog_device *wdog, enum chips chip)
{
int ret;
unsigned char t;
ret = superio_enter();
if (ret)
return ret;
superio_select(W83627HF_LD_WDT);
/* set CR30 bit 0 to activate GPIO2 */
t = superio_inb(0x30);
if (!(t & 0x01))
superio_outb(0x30, t | 0x01);
switch (chip) {
case w83627hf:
case w83627s:
t = superio_inb(0x2B) & ~0x10;
superio_outb(0x2B, t); /* set GPIO24 to WDT0 */
break;
case w83697hf:
/* Set pin 119 to WDTO# mode (= CR29, WDT0) */
t = superio_inb(0x29) & ~0x60;
t |= 0x20;
superio_outb(0x29, t);
break;
case w83697ug:
/* Set pin 118 to WDTO# mode */
t = superio_inb(0x2b) & ~0x04;
superio_outb(0x2b, t);
break;
case w83627thf:
t = (superio_inb(0x2B) & ~0x08) | 0x04;
superio_outb(0x2B, t); /* set GPIO3 to WDT0 */
break;
case w83627dhg:
case w83627dhg_p:
t = superio_inb(0x2D) & ~0x01; /* PIN77 -> WDT0# */
superio_outb(0x2D, t); /* set GPIO5 to WDT0 */
t = superio_inb(cr_wdt_control);
t |= 0x02; /* enable the WDTO# output low pulse
* to the KBRST# pin */
superio_outb(cr_wdt_control, t);
break;
case w83637hf:
break;
case w83687thf:
t = superio_inb(0x2C) & ~0x80; /* PIN47 -> WDT0# */
superio_outb(0x2C, t);
break;
case w83627ehf:
case w83627uhg:
case w83667hg:
case w83667hg_b:
case nct6775:
case nct6776:
case nct6779:
case nct6791:
case nct6792:
/*
* These chips have a fixed WDTO# output pin (W83627UHG),
* or support more than one WDTO# output pin.
* Don't touch its configuration, and hope the BIOS
* does the right thing.
*/
t = superio_inb(cr_wdt_control);
t |= 0x02; /* enable the WDTO# output low pulse
* to the KBRST# pin */
superio_outb(cr_wdt_control, t);
break;
default:
break;
}
t = superio_inb(cr_wdt_timeout);
if (t != 0) {
if (early_disable) {
pr_warn("Stopping previously enabled watchdog until userland kicks in\n");
superio_outb(cr_wdt_timeout, 0);
} else {
pr_info("Watchdog already running. Resetting timeout to %d sec\n",
wdog->timeout);
superio_outb(cr_wdt_timeout, wdog->timeout);
}
}
/* set second mode & disable keyboard turning off watchdog */
t = superio_inb(cr_wdt_control) & ~0x0C;
superio_outb(cr_wdt_control, t);
/* reset trigger, disable keyboard & mouse turning off watchdog */
t = superio_inb(0xF7) & ~0xD0;
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(cr_wdt_timeout, 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(cr_wdt_timeout);
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
|