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https://github.com/adulau/aha.git
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[WATCHDOG] IT8212F watchdog driver
This patch adds support for the ITE Tech Inc. IT8712F EC-LPC Super I/O chipset found on many Pentium III and AMD motherboards. Developed using code from other watchdog drivers and the datasheet on ITE Tech homepage. Signed-off-by: Jorge Boncompte <jorge@dti2.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Jorge Boncompte [DTI2]
Wim Van Sebroeck
parent
6027f661f8
commit
38ff6fd2fa
3 changed files with 411 additions and 0 deletions
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@ -392,6 +392,16 @@ config ITCO_VENDOR_SUPPORT
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devices. At this moment we only have additional support for some
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SuperMicro Inc. motherboards.
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config IT8712F_WDT
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tristate "IT8712F (Smart Guardian) Watchdog Timer"
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depends on X86
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---help---
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This is the driver for the built-in watchdog timer on the IT8712F
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Super I/0 chipset used on many motherboards.
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To compile this driver as a module, choose M here: the
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module will be called it8712f_wdt.
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config SC1200_WDT
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tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog"
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depends on X86
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@ -66,6 +66,7 @@ obj-$(CONFIG_IBMASR) += ibmasr.o
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obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o
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obj-$(CONFIG_I6300ESB_WDT) += i6300esb.o
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obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o iTCO_vendor_support.o
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obj-$(CONFIG_IT8712F_WDT) += it8712f_wdt.o
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obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
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obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o
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obj-$(CONFIG_PC87413_WDT) += pc87413_wdt.o
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400
drivers/watchdog/it8712f_wdt.c
Normal file
400
drivers/watchdog/it8712f_wdt.c
Normal file
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@ -0,0 +1,400 @@
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/*
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* IT8712F "Smart Guardian" Watchdog support
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*
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* Copyright (c) 2006-2007 Jorge Boncompte - DTI2 <jorge@dti2.net>
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*
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* Based on info and code taken from:
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*
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* drivers/char/watchdog/scx200_wdt.c
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* drivers/hwmon/it87.c
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* IT8712F EC-LPC I/O Preliminary Specification 0.9.2.pdf
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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 as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* The author(s) of this software shall not be held liable for damages
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* of any nature resulting due to the use of this software. This
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* software is provided AS-IS with no warranties.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/fs.h>
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#include <linux/pci.h>
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#include <linux/spinlock.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#define NAME "it8712f_wdt"
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MODULE_AUTHOR("Jorge Boncompte - DTI2 <jorge@dti2.net>");
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MODULE_DESCRIPTION("IT8712F Watchdog Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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static int margin = 60; /* in seconds */
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module_param(margin, int, 0);
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MODULE_PARM_DESC(margin, "Watchdog margin in seconds");
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
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static struct semaphore it8712f_wdt_sem;
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static unsigned expect_close;
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static spinlock_t io_lock;
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/* Dog Food address - We use the game port address */
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static unsigned short address;
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#define REG 0x2e /* The register to read/write */
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#define VAL 0x2f /* The value to read/write */
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#define LDN 0x07 /* Register: Logical device select */
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#define DEVID 0x20 /* Register: Device ID */
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#define DEVREV 0x22 /* Register: Device Revision */
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#define ACT_REG 0x30 /* LDN Register: Activation */
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#define BASE_REG 0x60 /* LDN Register: Base address */
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#define IT8712F_DEVID 0x8712
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#define LDN_GPIO 0x07 /* GPIO and Watch Dog Timer */
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#define LDN_GAME 0x09 /* Game Port */
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#define WDT_CONTROL 0x71 /* WDT Register: Control */
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#define WDT_CONFIG 0x72 /* WDT Register: Configuration */
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#define WDT_TIMEOUT 0x73 /* WDT Register: Timeout Value */
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#define WDT_RESET_GAME 0x10
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#define WDT_RESET_KBD 0x20
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#define WDT_RESET_MOUSE 0x40
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#define WDT_RESET_CIR 0x80
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#define WDT_UNIT_SEC 0x80 /* If 0 in MINUTES */
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#define WDT_OUT_PWROK 0x10
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#define WDT_OUT_KRST 0x40
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static int
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superio_inb(int reg)
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{
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outb(reg, REG);
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return inb(VAL);
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}
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static void
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superio_outb(int val, int reg)
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{
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outb(reg, REG);
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outb(val, VAL);
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}
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static int
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superio_inw(int reg)
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{
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int val;
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outb(reg++, REG);
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val = inb(VAL) << 8;
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outb(reg, REG);
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val |= inb(VAL);
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return val;
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}
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static inline void
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superio_select(int ldn)
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{
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outb(LDN, REG);
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outb(ldn, VAL);
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}
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static inline void
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superio_enter(void)
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{
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spin_lock(&io_lock);
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outb(0x87, REG);
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outb(0x01, REG);
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outb(0x55, REG);
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outb(0x55, REG);
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}
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static inline void
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superio_exit(void)
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{
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outb(0x02, REG);
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outb(0x02, VAL);
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spin_unlock(&io_lock);
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}
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static inline void
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it8712f_wdt_ping(void)
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{
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inb(address);
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}
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static void
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it8712f_wdt_update_margin(void)
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{
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int config = WDT_OUT_KRST | WDT_OUT_PWROK;
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printk(KERN_INFO NAME ": timer margin %d seconds\n", margin);
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/* The timeout register only has 8bits wide */
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if (margin < 256)
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config |= WDT_UNIT_SEC; /* else UNIT are MINUTES */
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superio_outb(config, WDT_CONFIG);
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superio_outb((margin > 255) ? (margin / 60) : margin, WDT_TIMEOUT);
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}
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static void
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it8712f_wdt_enable(void)
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{
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printk(KERN_DEBUG NAME ": enabling watchdog timer\n");
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superio_enter();
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superio_select(LDN_GPIO);
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superio_outb(WDT_RESET_GAME, WDT_CONTROL);
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it8712f_wdt_update_margin();
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superio_exit();
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it8712f_wdt_ping();
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}
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static void
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it8712f_wdt_disable(void)
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{
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printk(KERN_DEBUG NAME ": disabling watchdog timer\n");
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superio_enter();
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superio_select(LDN_GPIO);
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superio_outb(0, WDT_CONFIG);
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superio_outb(0, WDT_CONTROL);
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superio_outb(0, WDT_TIMEOUT);
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superio_exit();
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}
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static int
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it8712f_wdt_notify(struct notifier_block *this,
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unsigned long code, void *unused)
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{
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if (code == SYS_HALT || code == SYS_POWER_OFF)
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if (!nowayout)
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it8712f_wdt_disable();
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return NOTIFY_DONE;
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}
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static struct notifier_block it8712f_wdt_notifier = {
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.notifier_call = it8712f_wdt_notify,
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};
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static ssize_t
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it8712f_wdt_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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/* check for a magic close character */
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if (len) {
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size_t i;
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it8712f_wdt_ping();
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expect_close = 0;
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for (i = 0; i < len; ++i) {
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char c;
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if (get_user(c, data+i))
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return -EFAULT;
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if (c == 'V')
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expect_close = 42;
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}
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}
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return len;
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}
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static int
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it8712f_wdt_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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static struct watchdog_info ident = {
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.identity = "IT8712F Watchdog",
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.firmware_version = 1,
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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};
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int new_margin;
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switch (cmd) {
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default:
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return -ENOTTY;
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &ident, sizeof(ident)))
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return -EFAULT;
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return 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_KEEPALIVE:
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it8712f_wdt_ping();
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_margin, p))
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return -EFAULT;
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if (new_margin < 1)
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return -EINVAL;
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margin = new_margin;
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superio_enter();
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superio_select(LDN_GPIO);
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it8712f_wdt_update_margin();
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superio_exit();
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it8712f_wdt_ping();
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case WDIOC_GETTIMEOUT:
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if (put_user(margin, p))
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return -EFAULT;
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return 0;
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}
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}
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static int
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it8712f_wdt_open(struct inode *inode, struct file *file)
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{
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/* only allow one at a time */
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if (down_trylock(&it8712f_wdt_sem))
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return -EBUSY;
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it8712f_wdt_enable();
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return nonseekable_open(inode, file);
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}
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static int
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it8712f_wdt_release(struct inode *inode, struct file *file)
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{
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if (expect_close != 42) {
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printk(KERN_WARNING NAME
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": watchdog device closed unexpectedly, will not"
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" disable the watchdog timer\n");
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} else if (!nowayout) {
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it8712f_wdt_disable();
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}
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expect_close = 0;
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up(&it8712f_wdt_sem);
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return 0;
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}
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static struct file_operations it8712f_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = it8712f_wdt_write,
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.ioctl = it8712f_wdt_ioctl,
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.open = it8712f_wdt_open,
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.release = it8712f_wdt_release,
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};
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static struct miscdevice it8712f_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &it8712f_wdt_fops,
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};
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static int __init
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it8712f_wdt_find(unsigned short *address)
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{
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int err = -ENODEV;
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int chip_type;
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superio_enter();
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chip_type = superio_inw(DEVID);
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if (chip_type != IT8712F_DEVID)
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goto exit;
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superio_select(LDN_GAME);
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superio_outb(1, ACT_REG);
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if (!(superio_inb(ACT_REG) & 0x01)) {
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printk(KERN_ERR NAME ": Device not activated, skipping\n");
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goto exit;
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}
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*address = superio_inw(BASE_REG);
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if (*address == 0) {
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printk(KERN_ERR NAME ": Base address not set, skipping\n");
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goto exit;
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}
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err = 0;
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printk(KERN_DEBUG NAME ": Found IT%04xF chip revision %d - "
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"using DogFood address 0x%x\n",
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chip_type, superio_inb(DEVREV) & 0x0f, *address);
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exit:
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superio_exit();
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return err;
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}
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static int __init
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it8712f_wdt_init(void)
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{
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int err = 0;
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spin_lock_init(&io_lock);
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if (it8712f_wdt_find(&address))
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return -ENODEV;
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if (!request_region(address, 1, "IT8712F Watchdog")) {
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printk(KERN_WARNING NAME ": watchdog I/O region busy\n");
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return -EBUSY;
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}
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it8712f_wdt_disable();
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sema_init(&it8712f_wdt_sem, 1);
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err = register_reboot_notifier(&it8712f_wdt_notifier);
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if (err) {
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printk(KERN_ERR NAME ": unable to register reboot notifier\n");
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goto out;
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}
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err = misc_register(&it8712f_wdt_miscdev);
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if (err) {
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printk(KERN_ERR NAME
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": cannot register miscdev on minor=%d (err=%d)\n",
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WATCHDOG_MINOR, err);
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goto reboot_out;
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}
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return 0;
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reboot_out:
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unregister_reboot_notifier(&it8712f_wdt_notifier);
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out:
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release_region(address, 1);
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return err;
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}
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static void __exit
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it8712f_wdt_exit(void)
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{
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misc_deregister(&it8712f_wdt_miscdev);
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unregister_reboot_notifier(&it8712f_wdt_notifier);
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release_region(address, 1);
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}
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module_init(it8712f_wdt_init);
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module_exit(it8712f_wdt_exit);
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