1 files changed, 215 insertions, 0 deletions

diff --git a/drivers/watchdog/indydog.c b/drivers/watchdog/indydog.c
new file mode 100644
index 000000000000..788245bdaa7f
--- /dev/null
+++ b/drivers/watchdog/indydog.c
@@ -0,0 +1,215 @@
+/*
+ *      IndyDog 0.3     A Hardware Watchdog Device for SGI IP22
+ *
+ *      (c) Copyright 2002 Guido Guenther <agx@sigxcpu.org>, 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.
+ *
+ *      based on softdog.c by Alan Cox <alan@redhat.com>
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <asm/sgi/mc.h>
+
+#define PFX "indydog: "
+static int indydog_alive;
+
+#define WATCHDOG_TIMEOUT 30             /* 30 sec default timeout */
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static void indydog_start(void)
+{
+        u32 mc_ctrl0 = sgimc->cpuctrl0;
+
+        mc_ctrl0 = sgimc->cpuctrl0 | SGIMC_CCTRL0_WDOG;
+        sgimc->cpuctrl0 = mc_ctrl0;
+}
+
+static void indydog_stop(void)
+{
+        u32 mc_ctrl0 = sgimc->cpuctrl0;
+
+        mc_ctrl0 &= ~SGIMC_CCTRL0_WDOG;
+        sgimc->cpuctrl0 = mc_ctrl0;
+
+        printk(KERN_INFO PFX "Stopped watchdog timer.\n");
+}
+
+static void indydog_ping(void)
+{
+        sgimc->watchdogt = 0;
+}
+
+/*
+ *      Allow only one person to hold it open
+ */
+static int indydog_open(struct inode *inode, struct file *file)
+{
+        if (indydog_alive)
+                return -EBUSY;
+
+        if (nowayout)
+                __module_get(THIS_MODULE);
+
+        /* Activate timer */
+        indydog_start();
+        indydog_ping();
+
+        indydog_alive = 1;
+        printk(KERN_INFO "Started watchdog timer.\n");
+
+        return nonseekable_open(inode, file);
+}
+
+static int indydog_release(struct inode *inode, struct file *file)
+{
+        /* Shut off the timer.
+         * Lock it in if it's a module and we defined ...NOWAYOUT */
+        if (!nowayout)
+                indydog_stop();         /* Turn the WDT off */
+
+        indydog_alive = 0;
+
+        return 0;
+}
+
+static ssize_t indydog_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+{
+        /* Refresh the timer. */
+        if (len) {
+                indydog_ping();
+        }
+        return len;
+}
+
+static int indydog_ioctl(struct inode *inode, struct file *file,
+        unsigned int cmd, unsigned long arg)
+{
+        int options, retval = -EINVAL;
+        static struct watchdog_info ident = {
+                .options                = WDIOF_KEEPALIVEPING |
+                                          WDIOF_MAGICCLOSE,
+                .firmware_version       = 0,
+                .identity               = "Hardware Watchdog for SGI IP22",
+        };
+
+        switch (cmd) {
+                default:
+                        return -ENOTTY;
+                case WDIOC_GETSUPPORT:
+                        if (copy_to_user((struct watchdog_info *)arg,
+                                         &ident, sizeof(ident)))
+                                return -EFAULT;
+                        return 0;
+                case WDIOC_GETSTATUS:
+                case WDIOC_GETBOOTSTATUS:
+                        return put_user(0,(int *)arg);
+                case WDIOC_KEEPALIVE:
+                        indydog_ping();
+                        return 0;
+                case WDIOC_GETTIMEOUT:
+                        return put_user(WATCHDOG_TIMEOUT,(int *)arg);
+                case WDIOC_SETOPTIONS:
+                {
+                        if (get_user(options, (int *)arg))
+                                return -EFAULT;
+
+                        if (options & WDIOS_DISABLECARD) {
+                                indydog_stop();
+                                retval = 0;
+                        }
+
+                        if (options & WDIOS_ENABLECARD) {
+                                indydog_start();
+                                retval = 0;
+                        }
+
+                        return retval;
+                }
+        }
+}
+
+static int indydog_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
+{
+        if (code == SYS_DOWN || code == SYS_HALT)
+                indydog_stop();         /* Turn the WDT off */
+
+        return NOTIFY_DONE;
+}
+
+static const struct file_operations indydog_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .write          = indydog_write,
+        .ioctl          = indydog_ioctl,
+        .open           = indydog_open,
+        .release        = indydog_release,
+};
+
+static struct miscdevice indydog_miscdev = {
+        .minor          = WATCHDOG_MINOR,
+        .name           = "watchdog",
+        .fops           = &indydog_fops,
+};
+
+static struct notifier_block indydog_notifier = {
+        .notifier_call = indydog_notify_sys,
+};
+
+static char banner[] __initdata =
+        KERN_INFO PFX "Hardware Watchdog Timer for SGI IP22: 0.3\n";
+
+static int __init watchdog_init(void)
+{
+        int ret;
+
+        ret = register_reboot_notifier(&indydog_notifier);
+        if (ret) {
+                printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+                        ret);
+                return ret;
+        }
+
+        ret = misc_register(&indydog_miscdev);
+        if (ret) {
+                printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+                        WATCHDOG_MINOR, ret);
+                unregister_reboot_notifier(&indydog_notifier);
+                return ret;
+        }
+
+        printk(banner);
+
+        return 0;
+}
+
+static void __exit watchdog_exit(void)
+{
+        misc_deregister(&indydog_miscdev);
+        unregister_reboot_notifier(&indydog_notifier);
+}
+
+module_init(watchdog_init);
+module_exit(watchdog_exit);
+
+MODULE_AUTHOR("Guido Guenther <agx@sigxcpu.org>");
+MODULE_DESCRIPTION("Hardware Watchdog Device for SGI IP22");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);