--- /dev/null
+From 3c6c80a04d6ca99c4f9fbb5e4f279bd644b2df48 Mon Sep 17 00:00:00 2001
+From: Kurt Mahan <kmahan@freescale.com>
+Date: Tue, 8 Jul 2008 14:10:46 -0600
+Subject: [PATCH] Add Coldfire Watchdog support.
+
+LTIBName: mcfv4e-watchdog
+Signed-off-by: Kurt Mahan <kmahan@freescale.com>
+---
+ drivers/watchdog/Kconfig | 9 ++
+ drivers/watchdog/Makefile | 1 +
+ drivers/watchdog/mcf_wdt.c | 220 ++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 230 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/watchdog/mcf_wdt.c
+
+--- a/drivers/watchdog/Kconfig
++++ b/drivers/watchdog/Kconfig
+@@ -672,6 +672,15 @@ config TXX9_WDT
+
+ # PARISC Architecture
+
++# ColdFire Architecture
++
++config COLDFIRE_WATCHDOG
++ tristate "ColdFire watchdog support"
++ depends on WATCHDOG
++ help
++ To compile this driver as a module, choose M here: the
++ module will be called softdog.
++
+ # POWERPC Architecture
+
+ config MPC5200_WDT
+--- a/drivers/watchdog/Makefile
++++ b/drivers/watchdog/Makefile
+@@ -86,6 +86,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc
+ # M32R Architecture
+
+ # M68K Architecture
++obj-$(CONFIG_COLDFIRE_WATCHDOG) += mcf_wdt.o
+
+ # M68KNOMMU Architecture
+
+--- /dev/null
++++ b/drivers/watchdog/mcf_wdt.c
+@@ -0,0 +1,220 @@
++/*
++ * drivers/watchdog/mcf_wdt.c
++ *
++ * Watchdog driver for ColdFire processors
++ *
++ * Adapted from the IXP4xx watchdog driver.
++ * The original version carries these notices:
++ *
++ * Author: Deepak Saxena <dsaxena@plexity.net>
++ *
++ * Copyright 2004 (c) MontaVista, Software, Inc.
++ * Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
++ *
++ * This file is licensed under the terms of the GNU General Public
++ * License version 2. This program is licensed "as is" without any
++ * warranty of any kind, whether express or implied.
++ */
++
++#include <linux/module.h>
++#include <linux/moduleparam.h>
++#include <linux/types.h>
++#include <linux/kernel.h>
++#include <linux/fs.h>
++#include <linux/miscdevice.h>
++#include <linux/watchdog.h>
++#include <linux/init.h>
++#include <linux/bitops.h>
++
++#include <asm-m68k/uaccess.h>
++#include <asm-m68k/coldfire.h>
++#include <asm-m68k/m5485gpt.h>
++
++static int nowayout;
++static unsigned int heartbeat = 30; /* (secs) Default is 0.5 minute */
++static unsigned long wdt_status;
++
++#define WDT_IN_USE 0
++#define WDT_OK_TO_CLOSE 1
++
++static unsigned long wdt_tick_rate;
++
++static void
++wdt_enable(void)
++{
++ MCF_GPT_GMS0 = 0;
++ MCF_GPT_GCIR0 = MCF_GPT_GCIR_PRE(heartbeat*wdt_tick_rate) |
++ MCF_GPT_GCIR_CNT(0xffff);
++ MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS_WDEN |
++ MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS_GPIO;
++}
++
++static void
++wdt_disable(void)
++{
++ MCF_GPT_GMS0 = 0;
++}
++
++static void
++wdt_keepalive(void)
++{
++ MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS0;
++}
++
++static int
++mcf_wdt_open(struct inode *inode, struct file *file)
++{
++ if (test_and_set_bit(WDT_IN_USE, &wdt_status))
++ return -EBUSY;
++
++ clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
++
++ wdt_enable();
++
++ return nonseekable_open(inode, file);
++}
++
++static ssize_t
++mcf_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
++{
++ if (len) {
++ if (!nowayout) {
++ size_t i;
++
++ clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
++
++ for (i = 0; i != len; i++) {
++ char c;
++
++ if (get_user(c, data + i))
++ return -EFAULT;
++ if (c == 'V')
++ set_bit(WDT_OK_TO_CLOSE, &wdt_status);
++ }
++ }
++ wdt_keepalive();
++ }
++
++ return len;
++}
++
++
++static struct watchdog_info ident = {
++ .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
++ WDIOF_KEEPALIVEPING,
++ .identity = "Coldfire Watchdog",
++};
++
++static int
++mcf_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
++ unsigned long arg)
++{
++ int ret = -ENOIOCTLCMD;
++ int time;
++
++ switch (cmd) {
++ case WDIOC_GETSUPPORT:
++ ret = copy_to_user((struct watchdog_info *)arg, &ident,
++ sizeof(ident)) ? -EFAULT : 0;
++ break;
++
++ case WDIOC_GETSTATUS:
++ ret = put_user(0, (int *)arg);
++ break;
++
++ case WDIOC_GETBOOTSTATUS:
++ ret = put_user(0, (int *)arg);
++ break;
++
++ case WDIOC_SETTIMEOUT:
++ ret = get_user(time, (int *)arg);
++ if (ret)
++ break;
++
++ if (time <= 0 || time > 30) {
++ ret = -EINVAL;
++ break;
++ }
++
++ heartbeat = time;
++ wdt_enable();
++ /* Fall through */
++
++ case WDIOC_GETTIMEOUT:
++ ret = put_user(heartbeat, (int *)arg);
++ break;
++
++ case WDIOC_KEEPALIVE:
++ wdt_keepalive();
++ ret = 0;
++ break;
++ }
++
++ return ret;
++}
++
++static int
++mcf_wdt_release(struct inode *inode, struct file *file)
++{
++ if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) {
++ wdt_disable();
++ } else {
++ printk(KERN_CRIT "WATCHDOG: Device closed unexpectdly - "
++ "timer will not stop\n");
++ }
++
++ clear_bit(WDT_IN_USE, &wdt_status);
++ clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
++
++ return 0;
++}
++
++
++static struct file_operations mcf_wdt_fops = {
++ .owner = THIS_MODULE,
++ .llseek = no_llseek,
++ .write = mcf_wdt_write,
++ .ioctl = mcf_wdt_ioctl,
++ .open = mcf_wdt_open,
++ .release = mcf_wdt_release,
++};
++
++static struct miscdevice mcf_wdt_miscdev = {
++ .minor = WATCHDOG_MINOR,
++ .name = "watchdog",
++ .fops = &mcf_wdt_fops,
++};
++
++static int __init mcf_wdt_init(void)
++{
++ wdt_tick_rate = MCF_BUSCLK/0xffff;
++#ifdef CONFIG_WATCHDOG_NOWAYOUT
++ nowayout = 1;
++#else
++ nowayout = 0;
++#endif
++ printk("ColdFire watchdog driver is loaded.\n");
++
++ return misc_register(&mcf_wdt_miscdev);
++}
++
++static void __exit mcf_wdt_exit(void)
++{
++ misc_deregister(&mcf_wdt_miscdev);
++}
++
++module_init(mcf_wdt_init);
++module_exit(mcf_wdt_exit);
++
++MODULE_AUTHOR("Deepak Saxena");
++MODULE_DESCRIPTION("ColdFire Watchdog");
++
++module_param(heartbeat, int, 0);
++MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 60s)");
++
++module_param(nowayout, int, 0);
++MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
++
++MODULE_LICENSE("GPL");
++MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
++
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