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--- 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);
|
