This patch adds the driver for the watchdog found inside the Lantiq SoC family.
Signed-off-by: John Crispin <blogic@xxxxxxxxxxx>
Signed-off-by: Ralph Hempel <ralph.hempel@xxxxxxxxxx>
Cc: Wim Van Sebroeck <wim@xxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-watchdog@xxxxxxxxxxxxxxx
---
drivers/watchdog/Kconfig | 6 +
drivers/watchdog/Makefile | 1 +
drivers/watchdog/lantiq_wdt.c | 208 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 215 insertions(+), 0 deletions(-)
create mode 100644 drivers/watchdog/lantiq_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index a5ad77e..3e0733e 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -930,6 +930,12 @@ config BCM63XX_WDT
To compile this driver as a loadable module, choose M here.
The module will be called bcm63xx_wdt.
+config LANTIQ_WDT
+ tristate "Lantiq SoC watchdog"
+ depends on LANTIQ
+ help
+ Hardware driver for the Lantiq SoC Watchdog Timer.
+
# PARISC Architecture
# POWERPC Architecture
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 4b0ef38..d845e47 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -119,6 +119,7 @@ obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
+obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o
# PARISC Architecture
diff --git a/drivers/watchdog/lantiq_wdt.c b/drivers/watchdog/lantiq_wdt.c
new file mode 100644
index 0000000..543bcf1
--- /dev/null
+++ b/drivers/watchdog/lantiq_wdt.c
@@ -0,0 +1,208 @@
+/*
+ * 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@xxxxxxxxxxx>
+ * 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 LTQ_WDT_PW1 0x00BE0000
+#define LTQ_WDT_PW2 0x00DC0000
+
+#define LTQ_BIU_WDT_CR 0x3F0
+#define LTQ_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;
+static unsigned long io_region_clk;
+
+static int
+ltq_wdt_enable(unsigned int timeout)
+{
+ ltq_w32(LTQ_WDT_PW1, wdt_membase + LTQ_BIU_WDT_CR);
+ ltq_w32(LTQ_WDT_PW2 |
+ (0x3 << 26) | /* PWL */
+ (0x3 << 24) | /* CLKDIV */
+ (0x1 << 31) | /* enable */
+ ((timeout * (io_region_clk / 0x40000)) + 0x1000), /* reload */
+ wdt_membase + LTQ_BIU_WDT_CR);
+ return 0;
+}
+
+static void
+ltq_wdt_disable(void)
+{
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ wdt_ok_to_close = 0;
+#endif
+ ltq_w32(LTQ_WDT_PW1, wdt_membase + LTQ_BIU_WDT_CR);
+ ltq_w32(LTQ_WDT_PW2, wdt_membase + LTQ_BIU_WDT_CR);
+}
+
+static ssize_t
+ltq_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
+ ltq_wdt_enable(wdt_timeout);
+ return len;
+}
+
+static struct watchdog_info ident = {
+ .options = WDIOF_MAGICCLOSE,
+ .identity = "ltq_wdt",
+};
+
+static long
+ltq_wdt_ioctl(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:
+ ltq_wdt_enable(wdt_timeout);
+ ret = 0;
+ break;
+ }
+ return ret;
+}
+
+static int
+ltq_wdt_open(struct inode *inode, struct file *file)
+{
+ ltq_wdt_enable(wdt_timeout);
+ return nonseekable_open(inode, file);
+}
+
+static int
+ltq_wdt_release(struct inode *inode, struct file *file)
+{
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (wdt_ok_to_close)
+ ltq_wdt_disable();
+ else
+#endif
+ printk(KERN_ERR "ltq_wdt: watchdog closed without warning,"
+ " rebooting system\n");
+ return 0;
+}
+
+static const struct file_operations ltq_wdt_fops = {
+ .owner = THIS_MODULE,
+ .write = ltq_wdt_write,
+ .unlocked_ioctl = ltq_wdt_ioctl,
+ .open = ltq_wdt_open,
+ .release = ltq_wdt_release,
+};
+
+static struct miscdevice ltq_wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = <q_wdt_fops,
+};
+
+static int
+ltq_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(<q_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
+ltq_wdt_remove(struct platform_device *dev)
+{
+ ltq_wdt_disable();
+ misc_deregister(<q_wdt_miscdev);
+ return 0;
+}
+
+static struct platform_driver ltq_wdt_driver = {
+ .probe = ltq_wdt_probe,
+ .remove = ltq_wdt_remove,
+ .driver = {
+ .name = "ltq_wdt",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init
+init_ltq_wdt(void)
+{
+ return platform_driver_register(<q_wdt_driver);
+}
+
+static void __exit
+exit_ltq_wdt(void)
+{
+ platform_driver_unregister(<q_wdt_driver);
+}
+
+module_init(init_ltq_wdt);
+module_exit(exit_ltq_wdt);
+
+MODULE_AUTHOR("John Crispin <blogic@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Lantiq Watchdog");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
--
1.7.2.3
