openwrt/target/linux/lantiq/patches/250-watchdog.patch

--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -840,6 +840,12 @@ config TXX9_WDT
 	help
 	  Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs.
 
+config LANTIQ_WDT
+	bool "Lantiq SoC watchdog"
+	depends on LANTIQ
+	help
+	  Hardware driver for the Lantiq SoC Watchdog Timer.
+
 # PARISC Architecture
 
 # POWERPC Architecture
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -112,6 +112,7 @@ obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt
 obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
 obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
 obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
+obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o
 
 # PARISC Architecture
 
--- /dev/null
+++ b/drivers/watchdog/lantiq_wdt.c
@@ -0,0 +1,218 @@
+/*
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ *
+ *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
+ *  Based on EP93xx wdt driver
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+#include <linux/clk.h>
+
+#include <lantiq.h>
+
+#define LQ_WDT_PW1			0x00BE0000
+#define LQ_WDT_PW2			0x00DC0000
+
+#define LQ_BIU_WDT_CR		0x3F0
+#define LQ_BIU_WDT_SR		0x3F8
+
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+static int wdt_ok_to_close;
+#endif
+
+static int wdt_timeout = 30;
+static __iomem void *wdt_membase = NULL;
+static unsigned long io_region_clk = 0;
+
+static int
+lq_wdt_enable(unsigned int timeout)
+{
+/*	printk("%s:%s[%d] %08X\n",
+		__FILE__, __func__, __LINE__,
+		lq_r32(wdt_membase + LQ_BIU_WDT_SR));
+	if(!lq_r32(wdt_membase + LQ_BIU_WDT_SR))
+	{
+*/	lq_w32(LQ_WDT_PW1, wdt_membase + LQ_BIU_WDT_CR);
+	lq_w32(LQ_WDT_PW2 |
+		(0x3 << 26) | /* PWL */
+		(0x3 << 24) | /* CLKDIV */
+		(0x1 << 31) | /* enable */
+		((timeout * (io_region_clk / 0x40000)) + 0x1000), /* reload */
+			wdt_membase + LQ_BIU_WDT_CR);
+//	}
+	return 0;
+}
+
+static void
+lq_wdt_disable(void)
+{
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+	wdt_ok_to_close = 0;
+#endif
+	lq_w32(LQ_WDT_PW1, wdt_membase + LQ_BIU_WDT_CR);
+	lq_w32(LQ_WDT_PW2, wdt_membase+ LQ_BIU_WDT_CR);
+}
+
+static ssize_t
+lq_wdt_write(struct file *file, const char __user *data,
+		size_t len, loff_t *ppos)
+{
+	size_t i;
+
+	if (!len)
+		return 0;
+
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+	for (i = 0; i != len; i++) {
+		char c;
+		if (get_user(c, data + i))
+			return -EFAULT;
+		if (c == 'V')
+			wdt_ok_to_close = 1;
+	}
+#endif
+	lq_wdt_enable(wdt_timeout);
+	return len;
+}
+
+static struct watchdog_info ident = {
+	.options = WDIOF_MAGICCLOSE,
+	.identity = "lq_wdt",
+};
+
+static int
+lq_wdt_ioctl(struct inode *inode, struct file *file,
+		unsigned int cmd, unsigned long arg)
+{
+	int ret = -ENOTTY;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		ret = copy_to_user((struct watchdog_info __user *)arg, &ident,
+				sizeof(ident)) ? -EFAULT : 0;
+		break;
+
+	case WDIOC_GETTIMEOUT:
+		ret = put_user(wdt_timeout, (int __user *)arg);
+		break;
+
+	case WDIOC_SETTIMEOUT:
+		ret = get_user(wdt_timeout, (int __user *)arg);
+		break;
+
+	case WDIOC_KEEPALIVE:
+		lq_wdt_enable(wdt_timeout);
+		ret = 0;
+		break;
+	}
+	return ret;
+}
+
+static int
+lq_wdt_open(struct inode *inode, struct file *file)
+{
+	lq_wdt_enable(wdt_timeout);
+	return nonseekable_open(inode, file);
+}
+
+static int
+lq_wdt_release(struct inode *inode, struct file *file)
+{
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+	if (wdt_ok_to_close)
+		lq_wdt_disable();
+	else
+#endif
+		printk(KERN_ERR "lq_wdt: watchdog closed without warning,"
+			" rebooting system\n");
+	return 0;
+}
+
+static const struct file_operations lq_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.write		= lq_wdt_write,
+	.ioctl		= lq_wdt_ioctl,
+	.open		= lq_wdt_open,
+	.release	= lq_wdt_release,
+};
+
+static struct miscdevice lq_wdt_miscdev = {
+	.minor		= WATCHDOG_MINOR,
+	.name		= "watchdog",
+	.fops		= &lq_wdt_fops,
+};
+
+static int
+lq_wdt_probe(struct platform_device *pdev)
+{
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct clk *clk;
+	int ret = 0;
+	if(!res)
+		return -ENOENT;
+	res = request_mem_region(res->start, resource_size(res),
+		dev_name(&pdev->dev));
+	if(!res)
+		return -EBUSY;
+	wdt_membase = ioremap_nocache(res->start, resource_size(res));
+	if(!wdt_membase)
+	{
+		ret = -ENOMEM;
+		goto err_release_mem_region;
+	}
+	clk = clk_get(&pdev->dev, "io");
+	io_region_clk = clk_get_rate(clk);;
+	ret = misc_register(&lq_wdt_miscdev);
+	if(!ret)
+		return 0;
+
+	iounmap(wdt_membase);
+err_release_mem_region:
+	release_mem_region(res->start, resource_size(res));
+	return ret;
+}
+
+static int
+lq_wdt_remove(struct platform_device *dev)
+{
+	lq_wdt_disable();
+	misc_deregister(&lq_wdt_miscdev);
+	return 0;
+}
+
+static struct platform_driver lq_wdt_driver = {
+	.probe = lq_wdt_probe,
+	.remove = lq_wdt_remove,
+	.driver = {
+		.name = "lq_wdt",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init
+init_lq_wdt(void)
+{
+	return platform_driver_register(&lq_wdt_driver);
+}
+
+static void __exit
+exit_lq_wdt(void)
+{
+	platform_driver_unregister(&lq_wdt_driver);
+}
+
+module_init(init_lq_wdt);
+module_exit(exit_lq_wdt);
+
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
+MODULE_DESCRIPTION("ifxmips Watchdog");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);