--- /dev/null
+--- /dev/null
++++ b/drivers/watchdog/ar2315-wtd.c
+@@ -0,0 +1,209 @@
++/*
++ * 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.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, see <http://www.gnu.org/licenses/>.
++ *
++ * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
++ * Based on EP93xx and ifxmips wdt driver
++ */
++
++#include <linux/interrupt.h>
++#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/platform_device.h>
++#include <linux/io.h>
++#include <linux/uaccess.h>
++
++#define DRIVER_NAME "ar2315-wdt"
++
++#define CLOCK_RATE 40000000
++#define HEARTBEAT(x) (x < 1 || x > 90 ? 20 : x)
++
++#define WDT_REG_TIMER 0x00
++#define WDT_REG_CTRL 0x04
++
++#define WDT_CTRL_ACT_NONE 0x00000000 /* No action */
++#define WDT_CTRL_ACT_NMI 0x00000001 /* NMI on watchdog */
++#define WDT_CTRL_ACT_RESET 0x00000002 /* reset on watchdog */
++
++static int wdt_timeout = 20;
++static int started;
++static int in_use;
++static void __iomem *wdt_base;
++
++static inline void ar2315_wdt_wr(unsigned reg, u32 val)
++{
++ iowrite32(val, wdt_base + reg);
++}
++
++static void
++ar2315_wdt_enable(void)
++{
++ ar2315_wdt_wr(WDT_REG_TIMER, wdt_timeout * CLOCK_RATE);
++}
++
++static ssize_t
++ar2315_wdt_write(struct file *file, const char __user *data, size_t len,
++ loff_t *ppos)
++{
++ if (len)
++ ar2315_wdt_enable();
++ return len;
++}
++
++static int
++ar2315_wdt_open(struct inode *inode, struct file *file)
++{
++ if (in_use)
++ return -EBUSY;
++ ar2315_wdt_enable();
++ in_use = 1;
++ started = 1;
++ return nonseekable_open(inode, file);
++}
++
++static int
++ar2315_wdt_release(struct inode *inode, struct file *file)
++{
++ in_use = 0;
++ return 0;
++}
++
++static irqreturn_t
++ar2315_wdt_interrupt(int irq, void *dev)
++{
++ struct platform_device *pdev = (struct platform_device *)dev;
++
++ if (started) {
++ dev_crit(&pdev->dev, "watchdog expired, rebooting system\n");
++ emergency_restart();
++ } else {
++ ar2315_wdt_wr(WDT_REG_CTRL, 0);
++ ar2315_wdt_wr(WDT_REG_TIMER, 0);
++ }
++ return IRQ_HANDLED;
++}
++
++static struct watchdog_info ident = {
++ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
++ .identity = "ar2315 Watchdog",
++};
++
++static long
++ar2315_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
++{
++ int new_wdt_timeout;
++ int ret = -ENOIOCTLCMD;
++
++ switch (cmd) {
++ case WDIOC_GETSUPPORT:
++ ret = copy_to_user((void __user *)arg, &ident, sizeof(ident)) ?
++ -EFAULT : 0;
++ break;
++ case WDIOC_KEEPALIVE:
++ ar2315_wdt_enable();
++ ret = 0;
++ break;
++ case WDIOC_SETTIMEOUT:
++ ret = get_user(new_wdt_timeout, (int __user *)arg);
++ if (ret)
++ break;
++ wdt_timeout = HEARTBEAT(new_wdt_timeout);
++ ar2315_wdt_enable();
++ break;
++ case WDIOC_GETTIMEOUT:
++ ret = put_user(wdt_timeout, (int __user *)arg);
++ break;
++ }
++ return ret;
++}
++
++static const struct file_operations ar2315_wdt_fops = {
++ .owner = THIS_MODULE,
++ .llseek = no_llseek,
++ .write = ar2315_wdt_write,
++ .unlocked_ioctl = ar2315_wdt_ioctl,
++ .open = ar2315_wdt_open,
++ .release = ar2315_wdt_release,
++};
++
++static struct miscdevice ar2315_wdt_miscdev = {
++ .minor = WATCHDOG_MINOR,
++ .name = "watchdog",
++ .fops = &ar2315_wdt_fops,
++};
++
++static int
++ar2315_wdt_probe(struct platform_device *dev)
++{
++ struct resource *mem_res, *irq_res;
++ int ret = 0;
++
++ if (wdt_base)
++ return -EBUSY;
++
++ irq_res = platform_get_resource(dev, IORESOURCE_IRQ, 0);
++ if (!irq_res) {
++ dev_err(&dev->dev, "no IRQ resource\n");
++ return -ENOENT;
++ }
++
++ mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
++ wdt_base = devm_ioremap_resource(&dev->dev, mem_res);
++ if (IS_ERR(wdt_base))
++ return PTR_ERR(wdt_base);
++
++ ret = devm_request_irq(&dev->dev, irq_res->start, ar2315_wdt_interrupt,
++ IRQF_DISABLED, DRIVER_NAME, dev);
++ if (ret) {
++ dev_err(&dev->dev, "failed to register inetrrupt\n");
++ goto out;
++ }
++
++ ret = misc_register(&ar2315_wdt_miscdev);
++ if (ret)
++ dev_err(&dev->dev, "failed to register miscdev\n");
++
++out:
++ return ret;
++}
++
++static int
++ar2315_wdt_remove(struct platform_device *dev)
++{
++ misc_deregister(&ar2315_wdt_miscdev);
++ return 0;
++}
++
++static struct platform_driver ar2315_wdt_driver = {
++ .probe = ar2315_wdt_probe,
++ .remove = ar2315_wdt_remove,
++ .driver = {
++ .name = DRIVER_NAME,
++ .owner = THIS_MODULE,
++ },
++};
++
++module_platform_driver(ar2315_wdt_driver);
++
++MODULE_DESCRIPTION("Atheros AR2315 hardware watchdog driver");
++MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
++MODULE_LICENSE("GPL");
++MODULE_ALIAS("platform:" DRIVER_NAME);
+--- a/drivers/watchdog/Kconfig
++++ b/drivers/watchdog/Kconfig
+@@ -1257,6 +1257,13 @@ config RALINK_WDT
+ help
+ Hardware driver for the Ralink SoC Watchdog Timer.
+
++config AR2315_WDT
++ tristate "Atheros AR2315+ WiSoCs Watchdog Timer"
++ depends on ATH25
++ help
++ Hardware driver for the built-in watchdog timer on the Atheros
++ AR2315/AR2316 WiSoCs.
++
+ # PARISC Architecture
+
+ # POWERPC Architecture
+--- a/drivers/watchdog/Makefile
++++ b/drivers/watchdog/Makefile
+@@ -138,6 +138,7 @@ obj-$(CONFIG_GPIO_WDT) += old_gpio_wdt.o
+ obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
+ obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
+ obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
++obj-$(CONFIG_AR2315_WDT) += ar2315-wtd.o
+ obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
+ obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
+ octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
+--- a/arch/mips/ath25/ar2315.c
++++ b/arch/mips/ath25/ar2315.c
+@@ -220,6 +220,24 @@ static struct platform_device ar2315_gpi
+ .num_resources = ARRAY_SIZE(ar2315_gpio_res)
+ };
+
++static struct resource ar2315_wdt_res[] = {
++ {
++ .flags = IORESOURCE_MEM,
++ .start = AR2315_RST_BASE + AR2315_WDT_TIMER,
++ .end = AR2315_RST_BASE + AR2315_WDT_TIMER + 8 - 1,
++ },
++ {
++ .flags = IORESOURCE_IRQ,
++ }
++};
++
++static struct platform_device ar2315_wdt = {
++ .id = 0,
++ .name = "ar2315-wdt",
++ .resource = ar2315_wdt_res,
++ .num_resources = ARRAY_SIZE(ar2315_wdt_res)
++};
++
+ static struct resource ar2315_spiflash_res[] = {
+ {
+ .name = "spiflash_read",
+@@ -252,6 +270,11 @@ void __init ar2315_init_devices(void)
+ ar2315_gpio_res[1].end = ar2315_gpio_res[1].start;
+ platform_device_register(&ar2315_gpio);
+
++ ar2315_wdt_res[1].start = irq_create_mapping(ar2315_misc_irq_domain,
++ AR2315_MISC_IRQ_WATCHDOG);
++ ar2315_wdt_res[1].end = ar2315_wdt_res[1].start;
++ platform_device_register(&ar2315_wdt);
++
+ platform_device_register(&ar2315_spiflash);
+
+ ar2315_eth_data.macaddr = ath25_board.config->enet0_mac;
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