/* * w83627hf/thf WDT driver * * (c) Copyright 2013 Guenter Roeck * converted to watchdog infrastructure * * (c) Copyright 2007 Vlad Drukker * added support for W83627THF. * * (c) Copyright 2003,2007 Pádraig Brady * * Based on advantechwdt.c which is based on wdt.c. * Original copyright messages: * * (c) Copyright 2000-2001 Marek Michalkiewicz * * (c) Copyright 1996 Alan Cox , * 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 */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #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 "); MODULE_DESCRIPTION("w83627hf/thf WDT driver");