Initial import

1 files changed, 207 insertions, 0 deletions

diff --git a/drivers/watchdog/indydog.c b/drivers/watchdog/indydog.c
new file mode 100644
index 000000000..5d20cdd30
--- /dev/null
+++ b/drivers/watchdog/indydog.c
@@ -0,0 +1,207 @@
+/*
+ *	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@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/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 <linux/uaccess.h>
+#include <asm/sgi/mc.h>
+
+static unsigned long indydog_alive;
+static DEFINE_SPINLOCK(indydog_lock);
+
+#define WATCHDOG_TIMEOUT 30		/* 30 sec default 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) ")");
+
+static void indydog_start(void)
+{
+	spin_lock(&indydog_lock);
+	sgimc->cpuctrl0 |= SGIMC_CCTRL0_WDOG;
+	spin_unlock(&indydog_lock);
+}
+
+static void indydog_stop(void)
+{
+	spin_lock(&indydog_lock);
+	sgimc->cpuctrl0 &= ~SGIMC_CCTRL0_WDOG;
+	spin_unlock(&indydog_lock);
+
+	pr_info("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 (test_and_set_bit(0, &indydog_alive))
+		return -EBUSY;
+
+	if (nowayout)
+		__module_get(THIS_MODULE);
+
+	/* Activate timer */
+	indydog_start();
+	indydog_ping();
+
+	pr_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 */
+	clear_bit(0, &indydog_alive);
+	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 long indydog_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg)
+{
+	int options, retval = -EINVAL;
+	static const struct watchdog_info ident = {
+		.options		= WDIOF_KEEPALIVEPING,
+		.firmware_version	= 0,
+		.identity		= "Hardware Watchdog for SGI IP22",
+	};
+
+	switch (cmd) {
+	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_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;
+	}
+	case WDIOC_KEEPALIVE:
+		indydog_ping();
+		return 0;
+	case WDIOC_GETTIMEOUT:
+		return put_user(WATCHDOG_TIMEOUT, (int *)arg);
+	default:
+		return -ENOTTY;
+	}
+}
+
+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,
+	.unlocked_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 int __init watchdog_init(void)
+{
+	int ret;
+
+	ret = register_reboot_notifier(&indydog_notifier);
+	if (ret) {
+		pr_err("cannot register reboot notifier (err=%d)\n", ret);
+		return ret;
+	}
+
+	ret = misc_register(&indydog_miscdev);
+	if (ret) {
+		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
+		       WATCHDOG_MINOR, ret);
+		unregister_reboot_notifier(&indydog_notifier);
+		return ret;
+	}
+
+	pr_info("Hardware Watchdog Timer for SGI IP22: 0.3\n");
+
+	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");