| /* |
| * 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 */ |
| |
| static void w83627hf_select_wd_register(void) |
| { |
| outb_p(0x87, WDT_EFER); /* Enter extended function mode */ |
| outb_p(0x87, WDT_EFER); /* Again according to manual */ |
| outb_p(0x07, WDT_EFER); /* point to logical device number reg */ |
| outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */ |
| } |
| |
| static void w83627hf_unselect_wd_register(void) |
| { |
| outb_p(0xAA, WDT_EFER); /* Leave extended function mode */ |
| } |
| |
| /* tyan motherboards seem to set F5 to 0x4C ? |
| * So explicitly init to appropriate value. */ |
| |
| static void w83627hf_init(struct watchdog_device *wdog) |
| { |
| unsigned char t; |
| |
| w83627hf_select_wd_register(); |
| |
| outb(0x20, WDT_EFER); /* check chip version */ |
| t = inb(WDT_EFDR); |
| if (t == 0x82) { /* W83627THF */ |
| outb_p(0x2b, WDT_EFER); /* select GPIO3 */ |
| t = ((inb_p(WDT_EFDR) & 0xf7) | 0x04); /* select WDT0 */ |
| outb_p(0x2b, WDT_EFER); |
| outb_p(t, WDT_EFDR); /* set GPIO3 to WDT0 */ |
| } else if (t == 0x88 || t == 0xa0) { /* W83627EHF / W83627DHG */ |
| outb_p(0x2d, WDT_EFER); /* select GPIO5 */ |
| t = inb_p(WDT_EFDR) & ~0x01; /* PIN77 -> WDT0# */ |
| outb_p(0x2d, WDT_EFER); |
| outb_p(t, WDT_EFDR); /* set GPIO5 to WDT0 */ |
| } |
| |
| outb_p(0x30, WDT_EFER); /* select CR30 */ |
| outb_p(0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */ |
| |
| outb_p(0xF6, WDT_EFER); /* Select CRF6 */ |
| t = inb_p(WDT_EFDR); /* read CRF6 */ |
| if (t != 0) { |
| pr_info("Watchdog already running. Resetting timeout to %d sec\n", |
| wdog->timeout); |
| outb_p(wdog->timeout, WDT_EFDR); /* Write back to CRF6 */ |
| } |
| |
| outb_p(0xF5, WDT_EFER); /* Select CRF5 */ |
| t = inb_p(WDT_EFDR); /* read CRF5 */ |
| t &= ~0x0C; /* set second mode & disable keyboard |
| turning off watchdog */ |
| t |= 0x02; /* enable the WDTO# output low pulse |
| to the KBRST# pin (PIN60) */ |
| outb_p(t, WDT_EFDR); /* Write back to CRF5 */ |
| |
| outb_p(0xF7, WDT_EFER); /* Select CRF7 */ |
| t = inb_p(WDT_EFDR); /* read CRF7 */ |
| t &= ~0xC0; /* disable keyboard & mouse turning off |
| watchdog */ |
| outb_p(t, WDT_EFDR); /* Write back to CRF7 */ |
| |
| w83627hf_unselect_wd_register(); |
| } |
| |
| static int wdt_set_time(unsigned int timeout) |
| { |
| w83627hf_select_wd_register(); |
| |
| outb_p(0xF6, WDT_EFER); /* Select CRF6 */ |
| outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF6 */ |
| |
| w83627hf_unselect_wd_register(); |
| |
| 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; |
| |
| w83627hf_select_wd_register(); |
| |
| outb_p(0xF6, WDT_EFER); /* Select CRF6 */ |
| timeleft = inb_p(WDT_EFDR); /* Read Timeout counter to CRF6 */ |
| |
| w83627hf_unselect_wd_register(); |
| |
| 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"); |
| |
| if (!request_region(wdt_io, 1, WATCHDOG_NAME)) { |
| pr_err("I/O address 0x%04x already in use\n", wdt_io); |
| return -EIO; |
| } |
| |
| watchdog_init_timeout(&wdt_dev, timeout, NULL); |
| watchdog_set_nowayout(&wdt_dev, nowayout); |
| |
| w83627hf_init(&wdt_dev); |
| |
| ret = register_reboot_notifier(&wdt_notifier); |
| if (ret != 0) { |
| pr_err("cannot register reboot notifier (err=%d)\n", ret); |
| goto unreg_regions; |
| } |
| |
| 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); |
| unreg_regions: |
| release_region(wdt_io, 1); |
| return ret; |
| } |
| |
| static void __exit wdt_exit(void) |
| { |
| watchdog_unregister_device(&wdt_dev); |
| unregister_reboot_notifier(&wdt_notifier); |
| release_region(wdt_io, 1); |
| } |
| |
| module_init(wdt_init); |
| module_exit(wdt_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>"); |
| MODULE_DESCRIPTION("w83627hf/thf WDT driver"); |