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