1 files changed, 461 insertions, 0 deletions
diff --git a/drivers/watchdog/w83697hf_wdt.c b/drivers/watchdog/w83697hf_wdt.c
new file mode 100644
index 00000000..cd9f3c1e
--- /dev/null
+++ b/drivers/watchdog/w83697hf_wdt.c
@@ -0,0 +1,461 @@
+/*
+ *	w83697hf/hg WDT driver
+ *
+ *	(c) Copyright 2006 Samuel Tardieu <sam@rfc1149.net>
+ *	(c) Copyright 2006 Marcus Junker <junker@anduras.de>
+ *
+ *	Based on w83627hf_wdt.c which is based on advantechwdt.c
+ *	which is based on wdt.c.
+ *	Original copyright messages:
+ *
+ *	(c) Copyright 2003 Pádraig Brady <P@draigBrady.com>
+ *
+ *	(c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
+ *
+ *	(c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
+ *						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.
+ *
+ *	Neither Marcus Junker nor ANDURAS AG admit liability nor provide
+ *	warranty for any of this software. This material is provided
+ *	"AS-IS" and at no charge.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#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>
+
+
+#define WATCHDOG_NAME "w83697hf/hg WDT"
+#define WATCHDOG_TIMEOUT 60		/* 60 sec default timeout */
+#define WATCHDOG_EARLY_DISABLE 1	/* Disable until userland kicks in */
+
+static unsigned long wdt_is_open;
+static char expect_close;
+static DEFINE_SPINLOCK(io_lock);
+
+/* You must set this - there is no sane way to probe for this board. */
+static int wdt_io = 0x2e;
+module_param(wdt_io, int, 0);
+MODULE_PARM_DESC(wdt_io,
+		"w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)");
+
+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 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 int early_disable = WATCHDOG_EARLY_DISABLE;
+module_param(early_disable, int, 0);
+MODULE_PARM_DESC(early_disable,
+	"Watchdog gets disabled at boot time (default="
+				__MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")");
+
+/*
+ *	Kernel methods.
+ */
+
+#define W83697HF_EFER (wdt_io + 0)  /* Extended Function Enable Register */
+#define W83697HF_EFIR (wdt_io + 0)  /* Extended Function Index Register
+							(same as EFER) */
+#define W83697HF_EFDR (wdt_io + 1)  /* Extended Function Data Register */
+
+static inline void w83697hf_unlock(void)
+{
+	outb_p(0x87, W83697HF_EFER);	/* Enter extended function mode */
+	outb_p(0x87, W83697HF_EFER);	/* Again according to manual */
+}
+
+static inline void w83697hf_lock(void)
+{
+	outb_p(0xAA, W83697HF_EFER);	/* Leave extended function mode */
+}
+
+/*
+ *	The three functions w83697hf_get_reg(), w83697hf_set_reg() and
+ *	w83697hf_write_timeout() must be called with the device unlocked.
+ */
+
+static unsigned char w83697hf_get_reg(unsigned char reg)
+{
+	outb_p(reg, W83697HF_EFIR);
+	return inb_p(W83697HF_EFDR);
+}
+
+static void w83697hf_set_reg(unsigned char reg, unsigned char data)
+{
+	outb_p(reg, W83697HF_EFIR);
+	outb_p(data, W83697HF_EFDR);
+}
+
+static void w83697hf_write_timeout(int timeout)
+{
+	/* Write Timeout counter to CRF4 */
+	w83697hf_set_reg(0xF4, timeout);
+}
+
+static void w83697hf_select_wdt(void)
+{
+	w83697hf_unlock();
+	w83697hf_set_reg(0x07, 0x08);	/* Switch to logic device 8 (GPIO2) */
+}
+
+static inline void w83697hf_deselect_wdt(void)
+{
+	w83697hf_lock();
+}
+
+static void w83697hf_init(void)
+{
+	unsigned char bbuf;
+
+	w83697hf_select_wdt();
+
+	bbuf = w83697hf_get_reg(0x29);
+	bbuf &= ~0x60;
+	bbuf |= 0x20;
+
+	/* Set pin 119 to WDTO# mode (= CR29, WDT0) */
+	w83697hf_set_reg(0x29, bbuf);
+
+	bbuf = w83697hf_get_reg(0xF3);
+	bbuf &= ~0x04;
+	w83697hf_set_reg(0xF3, bbuf);	/* Count mode is seconds */
+
+	w83697hf_deselect_wdt();
+}
+
+static void wdt_ping(void)
+{
+	spin_lock(&io_lock);
+	w83697hf_select_wdt();
+
+	w83697hf_write_timeout(timeout);
+
+	w83697hf_deselect_wdt();
+	spin_unlock(&io_lock);
+}
+
+static void wdt_enable(void)
+{
+	spin_lock(&io_lock);
+	w83697hf_select_wdt();
+
+	w83697hf_write_timeout(timeout);
+	w83697hf_set_reg(0x30, 1);	/* Enable timer */
+
+	w83697hf_deselect_wdt();
+	spin_unlock(&io_lock);
+}
+
+static void wdt_disable(void)
+{
+	spin_lock(&io_lock);
+	w83697hf_select_wdt();
+
+	w83697hf_set_reg(0x30, 0);	/* Disable timer */
+	w83697hf_write_timeout(0);
+
+	w83697hf_deselect_wdt();
+	spin_unlock(&io_lock);
+}
+
+static unsigned char wdt_running(void)
+{
+	unsigned char t;
+
+	spin_lock(&io_lock);
+	w83697hf_select_wdt();
+
+	t = w83697hf_get_reg(0xF4);	/* Read timer */
+
+	w83697hf_deselect_wdt();
+	spin_unlock(&io_lock);
+
+	return t;
+}
+
+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 = "W83697HF 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_enable();
+			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_enable();
+	return nonseekable_open(inode, file);
+}
+
+static int wdt_close(struct inode *inode, struct file *file)
+{
+	if (expect_close == 42)
+		wdt_disable();
+	else {
+		pr_crit("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 w83697hf_check_wdt(void)
+{
+	if (!request_region(wdt_io, 2, WATCHDOG_NAME)) {
+		pr_err("I/O address 0x%x already in use\n", wdt_io);
+		return -EIO;
+	}
+
+	pr_debug("Looking for watchdog at address 0x%x\n", wdt_io);
+	w83697hf_unlock();
+	if (w83697hf_get_reg(0x20) == 0x60) {
+		pr_info("watchdog found at address 0x%x\n", wdt_io);
+		w83697hf_lock();
+		return 0;
+	}
+	/* Reprotect in case it was a compatible device */
+	w83697hf_lock();
+
+	pr_info("watchdog not found at address 0x%x\n", wdt_io);
+	release_region(wdt_io, 2);
+	return -EIO;
+}
+
+static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 };
+
+static int __init wdt_init(void)
+{
+	int ret, i, found = 0;
+
+	pr_info("WDT driver for W83697HF/HG initializing\n");
+
+	if (wdt_io == 0) {
+		/* we will autodetect the W83697HF/HG watchdog */
+		for (i = 0; ((!found) && (w83697hf_ioports[i] != 0)); i++) {
+			wdt_io = w83697hf_ioports[i];
+			if (!w83697hf_check_wdt())
+				found++;
+		}
+	} else {
+		if (!w83697hf_check_wdt())
+			found++;
+	}
+
+	if (!found) {
+		pr_err("No W83697HF/HG could be found\n");
+		ret = -EIO;
+		goto out;
+	}
+
+	w83697hf_init();
+	if (early_disable) {
+		if (wdt_running())
+			pr_warn("Stopping previously enabled watchdog until userland kicks in\n");
+		wdt_disable();
+	}
+
+	if (wdt_set_heartbeat(timeout)) {
+		wdt_set_heartbeat(WATCHDOG_TIMEOUT);
+		pr_info("timeout value must be 1 <= timeout <= 255, using %d\n",
+			WATCHDOG_TIMEOUT);
+	}
+
+	ret = register_reboot_notifier(&wdt_notifier);
+	if (ret != 0) {
+		pr_err("cannot register reboot notifier (err=%d)\n", ret);
+		goto unreg_regions;
+	}
+
+	ret = misc_register(&wdt_miscdev);
+	if (ret != 0) {
+		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
+		       WATCHDOG_MINOR, ret);
+		goto unreg_reboot;
+	}
+
+	pr_info("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, 2);
+	goto out;
+}
+
+static void __exit wdt_exit(void)
+{
+	misc_deregister(&wdt_miscdev);
+	unregister_reboot_notifier(&wdt_notifier);
+	release_region(wdt_io, 2);
+}
+
+module_init(wdt_init);
+module_exit(wdt_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, "
+		"Samuel Tardieu <sam@rfc1149.net>");
+MODULE_DESCRIPTION("w83697hf/hg WDT driver");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);