1 files changed, 392 insertions, 0 deletions
diff --git a/drivers/watchdog/w83697ug_wdt.c b/drivers/watchdog/w83697ug_wdt.c
new file mode 100644
index 000000000000..c73b5e2919c6
--- /dev/null
+++ b/drivers/watchdog/w83697ug_wdt.c
@@ -0,0 +1,392 @@
+/*
+ *	w83697ug/uf WDT driver
+ *
+ *	(c) Copyright 2008 Flemming Fransen <ff@nrvissing.net>
+ *              reused original code to supoprt w83697ug/uf.
+ *
+ *	Based on w83627hf_wdt.c which is based on advantechwdt.c
+ *	which is based on wdt.c.
+ *	Original copyright messages:
+ *
+ *	(c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
+ *		added support for W83627THF.
+ *
+ *	(c) Copyright 2003 Pádraig Brady <P@draigBrady.com>
+ *
+ *	(c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
+ *
+ *	(c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
+ *				http://www.redhat.com
+ *
+ *	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@redhat.com>
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/fs.h>
+#include <linux/ioport.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include <asm/system.h>
+
+#define WATCHDOG_NAME "w83697ug/uf WDT"
+#define PFX WATCHDOG_NAME ": "
+#define WATCHDOG_TIMEOUT 60		/* 60 sec default timeout */
+
+static unsigned long wdt_is_open;
+static char expect_close;
+static DEFINE_SPINLOCK(io_lock);
+
+static int wdt_io = 0x2e;
+module_param(wdt_io, int, 0);
+MODULE_PARM_DESC(wdt_io, "w83697ug/uf WDT io port (default 0x2e)");
+
+static int timeout = WATCHDOG_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 int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 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 w83697ug_select_wd_register(void)
+{
+	unsigned char c;
+	unsigned char version;
+
+	outb_p(0x87, WDT_EFER); /* Enter extended function mode */
+	outb_p(0x87, WDT_EFER); /* Again according to manual */
+
+	outb(0x20, WDT_EFER); 	/* check chip version	*/
+	version = inb(WDT_EFDR);
+
+	if (version == 0x68) {	/* W83697UG 		*/
+		printk(KERN_INFO PFX "Watchdog chip version 0x%02x = "
+			"W83697UG/UF found at 0x%04x\n", version, wdt_io);
+
+		outb_p(0x2b, WDT_EFER);
+		c = inb_p(WDT_EFDR);    /* select WDT0 */
+		c &= ~0x04;
+		outb_p(0x2b, WDT_EFER);
+		outb_p(c, WDT_EFDR);	/* set pin118 to WDT0 */
+
+	} else {
+		printk(KERN_ERR PFX "No W83697UG/UF could be found\n");
+		return -EIO;
+	}
+
+	outb_p(0x07, WDT_EFER); /* point to logical device number reg */
+	outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */
+	outb_p(0x30, WDT_EFER); /* select CR30 */
+	c = inb_p(WDT_EFDR);
+	outb_p(c || 0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
+}
+
+static void w83697ug_unselect_wd_register(void)
+{
+	outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
+}
+
+static void w83697ug_init(void)
+{
+	unsigned char t;
+
+	w83697ug_select_wd_register();
+
+	outb_p(0xF6, WDT_EFER); /* Select CRF6 */
+	t = inb_p(WDT_EFDR);    /* read CRF6 */
+	if (t != 0) {
+		printk(KERN_INFO PFX "Watchdog already running."
+			" Resetting timeout to %d sec\n", timeout);
+		outb_p(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 */
+	outb_p(t, WDT_EFDR);    /* Write back to CRF5 */
+
+	w83697ug_unselect_wd_register();
+}
+
+static void wdt_ctrl(int timeout)
+{
+	spin_lock(&io_lock);
+
+	w83697ug_select_wd_register();
+
+	outb_p(0xF4, WDT_EFER);    /* Select CRF4 */
+	outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF4 */
+
+	w83697ug_unselect_wd_register();
+
+	spin_unlock(&io_lock);
+}
+
+static int wdt_ping(void)
+{
+	wdt_ctrl(timeout);
+	return 0;
+}
+
+static int wdt_disable(void)
+{
+	wdt_ctrl(0);
+	return 0;
+}
+
+static int wdt_set_heartbeat(int t)
+{
+	if (t < 1 || t > 255)
+		return -EINVAL;
+
+	timeout = t;
+	return 0;
+}
+
+static ssize_t wdt_write(struct file *file, const char __user *buf,
+						size_t count, loff_t *ppos)
+{
+	if (count) {
+		if (!nowayout) {
+			size_t i;
+
+			expect_close = 0;
+
+			for (i = 0; i != count; i++) {
+				char c;
+				if (get_user(c, buf + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 42;
+			}
+		}
+		wdt_ping();
+	}
+	return count;
+}
+
+static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+	int new_timeout;
+	static const struct watchdog_info ident = {
+		.options =		WDIOF_KEEPALIVEPING |
+					WDIOF_SETTIMEOUT |
+					WDIOF_MAGICCLOSE,
+		.firmware_version =	1,
+		.identity =		"W83697UG WDT",
+	};
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		if (copy_to_user(argp, &ident, sizeof(ident)))
+			return -EFAULT;
+		break;
+
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, p);
+
+	case WDIOC_SETOPTIONS:
+	{
+		int options, retval = -EINVAL;
+
+		if (get_user(options, p))
+			return -EFAULT;
+
+		if (options & WDIOS_DISABLECARD) {
+			wdt_disable();
+			retval = 0;
+		}
+
+		if (options & WDIOS_ENABLECARD) {
+			wdt_ping();
+			retval = 0;
+		}
+
+		return retval;
+	}
+
+	case WDIOC_KEEPALIVE:
+		wdt_ping();
+		break;
+
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_timeout, p))
+			return -EFAULT;
+		if (wdt_set_heartbeat(new_timeout))
+			return -EINVAL;
+		wdt_ping();
+		/* Fall */
+
+	case WDIOC_GETTIMEOUT:
+		return put_user(timeout, p);
+
+	default:
+		return -ENOTTY;
+	}
+	return 0;
+}
+
+static int wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &wdt_is_open))
+		return -EBUSY;
+	/*
+	 *	Activate
+	 */
+
+	wdt_ping();
+	return nonseekable_open(inode, file);
+}
+
+static int wdt_close(struct inode *inode, struct file *file)
+{
+	if (expect_close == 42)
+		wdt_disable();
+	else {
+		printk(KERN_CRIT PFX
+			"Unexpected close, not stopping watchdog!\n");
+		wdt_ping();
+	}
+	expect_close = 0;
+	clear_bit(0, &wdt_is_open);
+	return 0;
+}
+
+/*
+ *	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_disable();	/* Turn the WDT off */
+
+	return NOTIFY_DONE;
+}
+
+/*
+ *	Kernel Interfaces
+ */
+
+static const struct file_operations wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= wdt_write,
+	.unlocked_ioctl	= wdt_ioctl,
+	.open		= wdt_open,
+	.release	= wdt_close,
+};
+
+static struct miscdevice wdt_miscdev = {
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops = &wdt_fops,
+};
+
+/*
+ *	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;
+
+	printk(KERN_INFO "WDT driver for the Winbond(TM) W83697UG/UF Super I/O chip initialising.\n");
+
+	if (wdt_set_heartbeat(timeout)) {
+		wdt_set_heartbeat(WATCHDOG_TIMEOUT);
+		printk(KERN_INFO PFX
+			"timeout value must be 1<=timeout<=255, using %d\n",
+			WATCHDOG_TIMEOUT);
+	}
+
+	if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
+		printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
+			wdt_io);
+		ret = -EIO;
+		goto out;
+	}
+
+	w83697ug_init();
+
+	ret = register_reboot_notifier(&wdt_notifier);
+	if (ret != 0) {
+		printk(KERN_ERR PFX
+			"cannot register reboot notifier (err=%d)\n", ret);
+		goto unreg_regions;
+	}
+
+	ret = misc_register(&wdt_miscdev);
+	if (ret != 0) {
+		printk(KERN_ERR PFX
+			"cannot register miscdev on minor=%d (err=%d)\n",
+			WATCHDOG_MINOR, ret);
+		goto unreg_reboot;
+	}
+
+	printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
+		timeout, nowayout);
+
+out:
+	return ret;
+unreg_reboot:
+	unregister_reboot_notifier(&wdt_notifier);
+unreg_regions:
+	release_region(wdt_io, 1);
+	goto out;
+}
+
+static void __exit wdt_exit(void)
+{
+	misc_deregister(&wdt_miscdev);
+	unregister_reboot_notifier(&wdt_notifier);
+	release_region(wdt_io, 1);
+}
+
+module_init(wdt_init);
+module_exit(wdt_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Flemming Frandsen <ff@nrvissing.net>");
+MODULE_DESCRIPTION("w83697ug/uf WDT driver");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);