Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=38ff6fd2fa4959925cf217ccaebea90fabd8ce04
Commit:     38ff6fd2fa4959925cf217ccaebea90fabd8ce04
Parent:     6027f661f8da653f084df80f4aade21359bcea35
Author:     Jorge Boncompte [DTI2] <[EMAIL PROTECTED]>
AuthorDate: Mon Nov 19 15:09:21 2007 +0100
Committer:  Wim Van Sebroeck <[EMAIL PROTECTED]>
CommitDate: Mon Nov 19 21:25:41 2007 +0000

    [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 <[EMAIL PROTECTED]>
    Signed-off-by: Wim Van Sebroeck <[EMAIL PROTECTED]>
---
 drivers/watchdog/Kconfig       |   10 +
 drivers/watchdog/Makefile      |    1 +
 drivers/watchdog/it8712f_wdt.c |  400 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 411 insertions(+), 0 deletions(-)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 2792bc1..126b554 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -392,6 +392,16 @@ config ITCO_VENDOR_SUPPORT
          devices. At this moment we only have additional support for some
          SuperMicro Inc. motherboards.
 
+config IT8712F_WDT
+       tristate "IT8712F (Smart Guardian) Watchdog Timer"
+       depends on X86
+       ---help---
+         This is the driver for the built-in watchdog timer on the IT8712F
+         Super I/0 chipset used on many motherboards.
+
+         To compile this driver as a module, choose M here: the
+         module will be called it8712f_wdt.
+
 config SC1200_WDT
        tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog"
        depends on X86
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 7d9e573..e4779f7 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -66,6 +66,7 @@ obj-$(CONFIG_IBMASR) += ibmasr.o
 obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o
 obj-$(CONFIG_I6300ESB_WDT) += i6300esb.o
 obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o iTCO_vendor_support.o
+obj-$(CONFIG_IT8712F_WDT) += it8712f_wdt.o
 obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
 obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o
 obj-$(CONFIG_PC87413_WDT) += pc87413_wdt.o
diff --git a/drivers/watchdog/it8712f_wdt.c b/drivers/watchdog/it8712f_wdt.c
new file mode 100644
index 0000000..6330fc0
--- /dev/null
+++ b/drivers/watchdog/it8712f_wdt.c
@@ -0,0 +1,400 @@
+/*
+ *     IT8712F "Smart Guardian" Watchdog support
+ *
+ *     Copyright (c) 2006-2007 Jorge Boncompte - DTI2 <[EMAIL PROTECTED]>
+ *
+ *     Based on info and code taken from:
+ *
+ *     drivers/char/watchdog/scx200_wdt.c
+ *     drivers/hwmon/it87.c
+ *     IT8712F EC-LPC I/O Preliminary Specification 0.9.2.pdf
+ *
+ *     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.
+ *
+ *     The author(s) of this software shall not be held liable for damages
+ *     of any nature resulting due to the use of this software. This
+ *     software is provided AS-IS with no warranties.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/fs.h>
+#include <linux/pci.h>
+#include <linux/spinlock.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#define NAME "it8712f_wdt"
+
+MODULE_AUTHOR("Jorge Boncompte - DTI2 <[EMAIL PROTECTED]>");
+MODULE_DESCRIPTION("IT8712F Watchdog Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+
+static int margin = 60;                /* in seconds */
+module_param(margin, int, 0);
+MODULE_PARM_DESC(margin, "Watchdog margin in seconds");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
+
+static struct semaphore it8712f_wdt_sem;
+static unsigned expect_close;
+static spinlock_t io_lock;
+
+/* Dog Food address - We use the game port address */
+static unsigned short address;
+
+#define        REG             0x2e    /* The register to read/write */
+#define        VAL             0x2f    /* The value to read/write */
+
+#define        LDN             0x07    /* Register: Logical device select */
+#define        DEVID           0x20    /* Register: Device ID */
+#define        DEVREV          0x22    /* Register: Device Revision */
+#define ACT_REG                0x30    /* LDN Register: Activation */
+#define BASE_REG       0x60    /* LDN Register: Base address */
+
+#define IT8712F_DEVID  0x8712
+
+#define LDN_GPIO       0x07    /* GPIO and Watch Dog Timer */
+#define LDN_GAME       0x09    /* Game Port */
+
+#define WDT_CONTROL    0x71    /* WDT Register: Control */
+#define WDT_CONFIG     0x72    /* WDT Register: Configuration */
+#define WDT_TIMEOUT    0x73    /* WDT Register: Timeout Value */
+
+#define WDT_RESET_GAME 0x10
+#define WDT_RESET_KBD  0x20
+#define WDT_RESET_MOUSE        0x40
+#define WDT_RESET_CIR  0x80
+
+#define WDT_UNIT_SEC   0x80    /* If 0 in MINUTES */
+
+#define WDT_OUT_PWROK  0x10
+#define WDT_OUT_KRST   0x40
+
+static int
+superio_inb(int reg)
+{
+       outb(reg, REG);
+       return inb(VAL);
+}
+
+static void
+superio_outb(int val, int reg)
+{
+       outb(reg, REG);
+       outb(val, VAL);
+}
+
+static int
+superio_inw(int reg)
+{
+       int val;
+       outb(reg++, REG);
+       val = inb(VAL) << 8;
+       outb(reg, REG);
+       val |= inb(VAL);
+       return val;
+}
+
+static inline void
+superio_select(int ldn)
+{
+       outb(LDN, REG);
+       outb(ldn, VAL);
+}
+
+static inline void
+superio_enter(void)
+{
+       spin_lock(&io_lock);
+       outb(0x87, REG);
+       outb(0x01, REG);
+       outb(0x55, REG);
+       outb(0x55, REG);
+}
+
+static inline void
+superio_exit(void)
+{
+       outb(0x02, REG);
+       outb(0x02, VAL);
+       spin_unlock(&io_lock);
+}
+
+static inline void
+it8712f_wdt_ping(void)
+{
+       inb(address);
+}
+
+static void
+it8712f_wdt_update_margin(void)
+{
+       int config = WDT_OUT_KRST | WDT_OUT_PWROK;
+
+       printk(KERN_INFO NAME ": timer margin %d seconds\n", margin);
+
+       /* The timeout register only has 8bits wide */
+       if (margin < 256)
+               config |= WDT_UNIT_SEC; /* else UNIT are MINUTES */
+       superio_outb(config, WDT_CONFIG);
+
+       superio_outb((margin > 255) ? (margin / 60) : margin, WDT_TIMEOUT);
+}
+
+static void
+it8712f_wdt_enable(void)
+{
+       printk(KERN_DEBUG NAME ": enabling watchdog timer\n");
+       superio_enter();
+       superio_select(LDN_GPIO);
+
+       superio_outb(WDT_RESET_GAME, WDT_CONTROL);
+
+       it8712f_wdt_update_margin();
+
+       superio_exit();
+
+       it8712f_wdt_ping();
+}
+
+static void
+it8712f_wdt_disable(void)
+{
+       printk(KERN_DEBUG NAME ": disabling watchdog timer\n");
+
+       superio_enter();
+       superio_select(LDN_GPIO);
+
+       superio_outb(0, WDT_CONFIG);
+       superio_outb(0, WDT_CONTROL);
+       superio_outb(0, WDT_TIMEOUT);
+
+       superio_exit();
+}
+
+static int
+it8712f_wdt_notify(struct notifier_block *this,
+                   unsigned long code, void *unused)
+{
+       if (code == SYS_HALT || code == SYS_POWER_OFF)
+               if (!nowayout)
+                       it8712f_wdt_disable();
+
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block it8712f_wdt_notifier = {
+       .notifier_call = it8712f_wdt_notify,
+};
+
+static ssize_t
+it8712f_wdt_write(struct file *file, const char __user *data,
+       size_t len, loff_t *ppos)
+{
+       /* check for a magic close character */
+       if (len) {
+               size_t i;
+
+               it8712f_wdt_ping();
+
+               expect_close = 0;
+               for (i = 0; i < len; ++i) {
+                       char c;
+                       if (get_user(c, data+i))
+                               return -EFAULT;
+                       if (c == 'V')
+                               expect_close = 42;
+               }
+       }
+
+       return len;
+}
+
+static int
+it8712f_wdt_ioctl(struct inode *inode, struct file *file,
+       unsigned int cmd, unsigned long arg)
+{
+       void __user *argp = (void __user *)arg;
+       int __user *p = argp;
+       static struct watchdog_info ident = {
+               .identity = "IT8712F Watchdog",
+               .firmware_version = 1,
+               .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+       };
+       int new_margin;
+
+       switch (cmd) {
+       default:
+               return -ENOTTY;
+       case WDIOC_GETSUPPORT:
+               if (copy_to_user(argp, &ident, sizeof(ident)))
+                       return -EFAULT;
+               return 0;
+       case WDIOC_GETSTATUS:
+       case WDIOC_GETBOOTSTATUS:
+               return put_user(0, p);
+       case WDIOC_KEEPALIVE:
+               it8712f_wdt_ping();
+               return 0;
+       case WDIOC_SETTIMEOUT:
+               if (get_user(new_margin, p))
+                       return -EFAULT;
+               if (new_margin < 1)
+                       return -EINVAL;
+               margin = new_margin;
+               superio_enter();
+               superio_select(LDN_GPIO);
+
+               it8712f_wdt_update_margin();
+
+               superio_exit();
+               it8712f_wdt_ping();
+       case WDIOC_GETTIMEOUT:
+               if (put_user(margin, p))
+                       return -EFAULT;
+               return 0;
+       }
+}
+
+static int
+it8712f_wdt_open(struct inode *inode, struct file *file)
+{
+       /* only allow one at a time */
+       if (down_trylock(&it8712f_wdt_sem))
+               return -EBUSY;
+       it8712f_wdt_enable();
+
+       return nonseekable_open(inode, file);
+}
+
+static int
+it8712f_wdt_release(struct inode *inode, struct file *file)
+{
+       if (expect_close != 42) {
+               printk(KERN_WARNING NAME
+                       ": watchdog device closed unexpectedly, will not"
+                       " disable the watchdog timer\n");
+       } else if (!nowayout) {
+               it8712f_wdt_disable();
+       }
+       expect_close = 0;
+       up(&it8712f_wdt_sem);
+
+       return 0;
+}
+
+static struct file_operations it8712f_wdt_fops = {
+       .owner = THIS_MODULE,
+       .llseek = no_llseek,
+       .write = it8712f_wdt_write,
+       .ioctl = it8712f_wdt_ioctl,
+       .open = it8712f_wdt_open,
+       .release = it8712f_wdt_release,
+};
+
+static struct miscdevice it8712f_wdt_miscdev = {
+       .minor = WATCHDOG_MINOR,
+       .name = "watchdog",
+       .fops = &it8712f_wdt_fops,
+};
+
+static int __init
+it8712f_wdt_find(unsigned short *address)
+{
+       int err = -ENODEV;
+       int chip_type;
+
+       superio_enter();
+       chip_type = superio_inw(DEVID);
+       if (chip_type != IT8712F_DEVID)
+               goto exit;
+
+       superio_select(LDN_GAME);
+       superio_outb(1, ACT_REG);
+       if (!(superio_inb(ACT_REG) & 0x01)) {
+               printk(KERN_ERR NAME ": Device not activated, skipping\n");
+               goto exit;
+       }
+
+       *address = superio_inw(BASE_REG);
+       if (*address == 0) {
+               printk(KERN_ERR NAME ": Base address not set, skipping\n");
+               goto exit;
+       }
+
+       err = 0;
+       printk(KERN_DEBUG NAME ": Found IT%04xF chip revision %d - "
+               "using DogFood address 0x%x\n",
+               chip_type, superio_inb(DEVREV) & 0x0f, *address);
+
+exit:
+       superio_exit();
+       return err;
+}
+
+static int __init
+it8712f_wdt_init(void)
+{
+       int err = 0;
+
+       spin_lock_init(&io_lock);
+
+       if (it8712f_wdt_find(&address))
+               return -ENODEV;
+
+       if (!request_region(address, 1, "IT8712F Watchdog")) {
+               printk(KERN_WARNING NAME ": watchdog I/O region busy\n");
+               return -EBUSY;
+       }
+
+       it8712f_wdt_disable();
+
+       sema_init(&it8712f_wdt_sem, 1);
+
+       err = register_reboot_notifier(&it8712f_wdt_notifier);
+       if (err) {
+               printk(KERN_ERR NAME ": unable to register reboot notifier\n");
+               goto out;
+       }
+
+       err = misc_register(&it8712f_wdt_miscdev);
+       if (err) {
+               printk(KERN_ERR NAME
+                       ": cannot register miscdev on minor=%d (err=%d)\n",
+                       WATCHDOG_MINOR, err);
+               goto reboot_out;
+       }
+
+       return 0;
+
+
+reboot_out:
+       unregister_reboot_notifier(&it8712f_wdt_notifier);
+out:
+       release_region(address, 1);
+       return err;
+}
+
+static void __exit
+it8712f_wdt_exit(void)
+{
+       misc_deregister(&it8712f_wdt_miscdev);
+       unregister_reboot_notifier(&it8712f_wdt_notifier);
+       release_region(address, 1);
+}
+
+module_init(it8712f_wdt_init);
+module_exit(it8712f_wdt_exit);
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