Dear Wim Van Sebroeck,
This is a watchdog driver for my w90p910 platform.
Thanks!
Add watchdog driver for w90p910 platform.
Signed-off-by: Wan ZongShun <[email protected]>
---
drivers/watchdog/Kconfig | 9 +
drivers/watchdog/Makefile | 1 +
drivers/watchdog/w90p910_wdt.c | 340 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 350 insertions(+), 0 deletions(-)
create mode 100644 drivers/watchdog/w90p910_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b1ccc04..fba4b91 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -266,6 +266,15 @@ config STMP3XXX_WATCHDOG
To compile this driver as a module, choose M here: the
module will be called stmp3xxx_wdt.
+config W90P910_WATCHDOG
+ tristate "Nuvoton W90P910 watchdog"
+ depends on ARCH_W90X900
+ help
+ Say Y here if to include support for the watchdog timer
+ for the Nuvoton W90P910 SoC.
+ To compile this driver as a module, choose M here: the
+ module will be called w90p910_wdt.
+
# AVR32 Architecture
config AT32AP700X_WDT
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 3d77429..ecc05b4 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o
obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
+obj-$(CONFIG_W90P910_WATCHDOG) += w90p910_wdt.o
# AVR32 Architecture
obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
diff --git a/drivers/watchdog/w90p910_wdt.c b/drivers/watchdog/w90p910_wdt.c
new file mode 100644
index 0000000..a73f85a
--- /dev/null
+++ b/drivers/watchdog/w90p910_wdt.c
@@ -0,0 +1,340 @@
+/*
+ * Copyright (c) 2009 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <[email protected]>
+ *
+ * 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;version 2 of the License.
+ *
+ */
+
+#include <linux/bitops.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/uaccess.h>
+
+#define WDT_DEFAULT_TIME_LEVEL 0 /* if 0, time = 2^14 clocks */
+#define WDT_MAX_TIME_LEVEL 3 /* if 3, time = 2^20 clocks */
+#define REG_WTCR 0x1c
+#define WTCLK (0x01 << 10)
+#define WTE (0x01 << 7) /*wdt enable*/
+#define WTIE (0x01 << 6) /*wdt interrupt enable*/
+#define WTISBIT (0x04)
+#define WTIS (0x03 << 4)
+#define WTIF (0x01 << 3)
+#define WTRF (0x01 << 2)
+#define WTRE (0x01 << 1)
+#define WTR 0x01
+
+static int wdt_time = WDT_DEFAULT_TIME_LEVEL;
+static int nowayout = WATCHDOG_NOWAYOUT;
+
+module_param(wdt_time, int, 0);
+MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
+ __MODULE_STRING(WDT_DEFAULT_TIME) ")");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+#endif
+
+struct w90p910_wdt {
+ struct resource *res;
+ struct clk *wdt_clock;
+ struct platform_device *pdev;
+ unsigned int open_lock;
+ unsigned int wdt_irq;
+ void __iomem *wdt_base;
+ char expect_close;
+ spinlock_t wdt_lock;
+};
+
+static unsigned long w90p910wdt_busy;
+struct w90p910_wdt *w90p910_wdt;
+
+static void w90p910_wdt_keepalive(void)
+{
+ unsigned int val;
+
+ spin_lock(&w90p910_wdt->wdt_lock);
+
+ val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
+ val |= (WTR | WTIF);
+ __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
+
+ spin_unlock(&w90p910_wdt->wdt_lock);
+}
+
+static irqreturn_t w90p910_wdt_irq(int irq, void *dev_id)
+{
+ w90p910_wdt_keepalive();
+ return IRQ_HANDLED;
+}
+
+static inline void w90p910_wdt_stop(void)
+{
+ unsigned int val;
+
+ spin_lock(&w90p910_wdt->wdt_lock);
+
+ val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
+ val &= ~WTE;
+ __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
+
+ spin_unlock(&w90p910_wdt->wdt_lock);
+}
+
+static inline void w90p910_wdt_start(void)
+{
+ unsigned int val;
+
+ spin_lock(&w90p910_wdt->wdt_lock);
+
+ val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
+ val |= (WTRE | WTIE | WTE | WTR | WTCLK | WTIF);
+ val |= (wdt_time << 0x04);
+ __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
+
+ spin_unlock(&w90p910_wdt->wdt_lock);
+}
+
+static int w90p910_wdt_open(struct inode *inode, struct file *file)
+{
+
+ if (test_and_set_bit(0, &w90p910wdt_busy))
+ return -EBUSY;
+
+ w90p910_wdt_start();
+ return nonseekable_open(inode, file);
+}
+
+static int w90p910_wdt_close(struct inode *inode, struct file *file)
+{
+ if (!nowayout)
+ w90p910_wdt_stop();
+
+ clear_bit(0, &w90p910wdt_busy);
+ return 0;
+}
+
+static int w90p910_wdt_settimeout(int new_time_level)
+{
+ unsigned int val;
+
+ if ((new_time_level < 0) || (new_time_level > WDT_MAX_TIME_LEVEL))
+ return -EINVAL;
+
+ val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
+ val &= ~WTIS;
+ val |= new_time_level;
+ __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
+
+ wdt_time = new_time_level;
+ return 0;
+}
+
+static struct watchdog_info w90p910_wdt_info = {
+ .identity = "w90p910 watchdog",
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+};
+
+static long w90p910_wdt_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ int __user *p = argp;
+ int new_value;
+
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ return copy_to_user(argp, &w90p910_wdt_info,
+ sizeof(w90p910_wdt_info)) ? -EFAULT : 0;
+ case WDIOC_GETSTATUS:
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(0, p);
+ case WDIOC_SETOPTIONS:
+ if (get_user(new_value, p))
+ return -EFAULT;
+ if (new_value & WDIOS_DISABLECARD)
+ w90p910_wdt_stop();
+ if (new_value & WDIOS_ENABLECARD)
+ w90p910_wdt_start();
+ return 0;
+ case WDIOC_KEEPALIVE:
+ w90p910_wdt_keepalive();
+ return 0;
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_value, p))
+ return -EFAULT;
+ if (w90p910_wdt_settimeout(new_value))
+ return -EINVAL;
+
+ w90p910_wdt_start();
+
+ return put_user(wdt_time, p);
+ case WDIOC_GETTIMEOUT:
+ return put_user(wdt_time, p);
+ default:
+ return -ENOTTY;
+ }
+}
+
+static ssize_t w90p910_wdt_write(struct file *file, const char *data,
+ size_t len, loff_t *ppos)
+{
+ w90p910_wdt_keepalive();
+ return len;
+}
+
+static const struct file_operations w90p910wdt_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .unlocked_ioctl = w90p910_wdt_ioctl,
+ .open = w90p910_wdt_open,
+ .release = w90p910_wdt_close,
+ .write = w90p910_wdt_write,
+};
+
+static struct miscdevice w90p910wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &w90p910wdt_fops,
+};
+
+static int __devinit w90p910wdt_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ w90p910_wdt = kzalloc(sizeof(struct w90p910_wdt), GFP_KERNEL);
+ if (!w90p910_wdt)
+ return -ENOMEM;
+
+ w90p910_wdt->pdev = pdev;
+
+ w90p910_wdt->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (w90p910_wdt->res == NULL) {
+ dev_err(&pdev->dev, "no memory resource specified\n");
+ ret = -ENOENT;
+ goto err_get;
+ }
+
+ if (!request_mem_region(w90p910_wdt->res->start,
+ resource_size(w90p910_wdt->res), pdev->name)) {
+ dev_err(&pdev->dev, "failed to get memory region\n");
+ ret = -ENOENT;
+ goto err_req;
+ }
+
+ w90p910_wdt->wdt_base = ioremap(w90p910_wdt->res->start,
+ resource_size(w90p910_wdt->res));
+ if (w90p910_wdt->wdt_base == NULL) {
+ dev_err(&pdev->dev, "failed to ioremap() region\n");
+ ret = -EINVAL;
+ goto err_req;
+ }
+
+ w90p910_wdt->wdt_irq = platform_get_irq(pdev, 0);
+ ret = request_irq(w90p910_wdt->wdt_irq,
+ w90p910_wdt_irq, 0, pdev->name, NULL);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "failed to install irq (%d)\n", ret);
+ goto err_map;
+ }
+
+ w90p910_wdt->wdt_clock = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(w90p910_wdt->wdt_clock)) {
+ dev_err(&pdev->dev, "failed to find watchdog clock source\n");
+ ret = PTR_ERR(w90p910_wdt->wdt_clock);
+ goto err_irq;
+ }
+
+ clk_enable(w90p910_wdt->wdt_clock);
+
+ if (misc_register(&w90p910wdt_miscdev)) {
+ dev_err(&pdev->dev, "err register miscdev on minor=%d (%d)\n",
+ WATCHDOG_MINOR, ret);
+ goto err_clk;
+ }
+
+ return 0;
+
+err_clk:
+ clk_disable(w90p910_wdt->wdt_clock);
+ clk_put(w90p910_wdt->wdt_clock);
+err_irq:
+ free_irq(w90p910_wdt->wdt_irq, NULL);
+err_map:
+ iounmap(w90p910_wdt->wdt_base);
+err_req:
+ release_mem_region(w90p910_wdt->res->start,
+ resource_size(w90p910_wdt->res));
+err_get:
+ kfree(w90p910_wdt);
+ return ret;
+}
+
+static int __devexit w90p910wdt_remove(struct platform_device *pdev)
+{
+ free_irq(w90p910_wdt->wdt_irq, NULL);
+
+ clk_disable(w90p910_wdt->wdt_clock);
+ clk_put(w90p910_wdt->wdt_clock);
+
+ iounmap(w90p910_wdt->wdt_base);
+
+ release_mem_region(w90p910_wdt->res->start,
+ resource_size(w90p910_wdt->res));
+
+ kfree(w90p910_wdt);
+
+ misc_deregister(&w90p910wdt_miscdev);
+ return 0;
+}
+
+static void w90p910wdt_shutdown(struct platform_device *pdev)
+{
+ w90p910_wdt_stop();
+}
+
+static struct platform_driver w90p910wdt_driver = {
+ .probe = w90p910wdt_probe,
+ .remove = __devexit_p(w90p910wdt_remove),
+ .shutdown = w90p910wdt_shutdown,
+ .driver = {
+ .name = "w90p910-wdt",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init w90p910_wdt_init(void)
+{
+ return platform_driver_register(&w90p910wdt_driver);
+}
+
+static void __exit w90p910_wdt_exit(void)
+{
+ platform_driver_unregister(&w90p910wdt_driver);
+}
+
+module_init(w90p910_wdt_init);
+module_exit(w90p910_wdt_exit);
+
+MODULE_AUTHOR("Wan ZongShun <[email protected]>");
+MODULE_DESCRIPTION("Watchdog driver for W90P910");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS("platform:w90p910-wdt");
--
1.5.6.3
Dear Wim,
How about this watchdog patch?
Would you mind applying?
Thanks for your help.
2009/7/24, Wan ZongShun <[email protected]>:
> Dear Wim Van Sebroeck,
>
> This is a watchdog driver for my w90p910 platform.
>
> Thanks!
>
>
>
> Add watchdog driver for w90p910 platform.
>
> Signed-off-by: Wan ZongShun <[email protected]>
>
> ---
> drivers/watchdog/Kconfig | 9 +
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/w90p910_wdt.c | 340 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 350 insertions(+), 0 deletions(-)
> create mode 100644 drivers/watchdog/w90p910_wdt.c
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index b1ccc04..fba4b91 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -266,6 +266,15 @@ config STMP3XXX_WATCHDOG
> To compile this driver as a module, choose M here: the
> module will be called stmp3xxx_wdt.
>
> +config W90P910_WATCHDOG
> + tristate "Nuvoton W90P910 watchdog"
> + depends on ARCH_W90X900
> + help
> + Say Y here if to include support for the watchdog timer
> + for the Nuvoton W90P910 SoC.
> + To compile this driver as a module, choose M here: the
> + module will be called w90p910_wdt.
> +
> # AVR32 Architecture
>
> config AT32AP700X_WDT
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 3d77429..ecc05b4 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -44,6 +44,7 @@ obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
> obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o
> obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
> obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
> +obj-$(CONFIG_W90P910_WATCHDOG) += w90p910_wdt.o
>
> # AVR32 Architecture
> obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
> diff --git a/drivers/watchdog/w90p910_wdt.c b/drivers/watchdog/w90p910_wdt.c
> new file mode 100644
> index 0000000..a73f85a
> --- /dev/null
> +++ b/drivers/watchdog/w90p910_wdt.c
> @@ -0,0 +1,340 @@
> +/*
> + * Copyright (c) 2009 Nuvoton technology corporation.
> + *
> + * Wan ZongShun <[email protected]>
> + *
> + * 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;version 2 of the License.
> + *
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/errno.h>
> +#include <linux/fs.h>
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/clk.h>
> +#include <linux/kernel.h>
> +#include <linux/miscdevice.h>
> +#include <linux/module.h>
> +#include <linux/moduleparam.h>
> +#include <linux/platform_device.h>
> +#include <linux/interrupt.h>
> +#include <linux/types.h>
> +#include <linux/watchdog.h>
> +#include <linux/uaccess.h>
> +
> +#define WDT_DEFAULT_TIME_LEVEL 0 /* if 0, time = 2^14 clocks */
> +#define WDT_MAX_TIME_LEVEL 3 /* if 3, time = 2^20 clocks */
> +#define REG_WTCR 0x1c
> +#define WTCLK (0x01 << 10)
> +#define WTE (0x01 << 7) /*wdt enable*/
> +#define WTIE (0x01 << 6) /*wdt interrupt enable*/
> +#define WTISBIT (0x04)
> +#define WTIS (0x03 << 4)
> +#define WTIF (0x01 << 3)
> +#define WTRF (0x01 << 2)
> +#define WTRE (0x01 << 1)
> +#define WTR 0x01
> +
> +static int wdt_time = WDT_DEFAULT_TIME_LEVEL;
> +static int nowayout = WATCHDOG_NOWAYOUT;
> +
> +module_param(wdt_time, int, 0);
> +MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
> + __MODULE_STRING(WDT_DEFAULT_TIME) ")");
> +
> +#ifdef CONFIG_WATCHDOG_NOWAYOUT
> +module_param(nowayout, int, 0);
> +MODULE_PARM_DESC(nowayout,
> + "Watchdog cannot be stopped once started (default="
> + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> +#endif
> +
> +struct w90p910_wdt {
> + struct resource *res;
> + struct clk *wdt_clock;
> + struct platform_device *pdev;
> + unsigned int open_lock;
> + unsigned int wdt_irq;
> + void __iomem *wdt_base;
> + char expect_close;
> + spinlock_t wdt_lock;
> +};
> +
> +static unsigned long w90p910wdt_busy;
> +struct w90p910_wdt *w90p910_wdt;
> +
> +static void w90p910_wdt_keepalive(void)
> +{
> + unsigned int val;
> +
> + spin_lock(&w90p910_wdt->wdt_lock);
> +
> + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
> + val |= (WTR | WTIF);
> + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
> +
> + spin_unlock(&w90p910_wdt->wdt_lock);
> +}
> +
> +static irqreturn_t w90p910_wdt_irq(int irq, void *dev_id)
> +{
> + w90p910_wdt_keepalive();
> + return IRQ_HANDLED;
> +}
> +
> +static inline void w90p910_wdt_stop(void)
> +{
> + unsigned int val;
> +
> + spin_lock(&w90p910_wdt->wdt_lock);
> +
> + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
> + val &= ~WTE;
> + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
> +
> + spin_unlock(&w90p910_wdt->wdt_lock);
> +}
> +
> +static inline void w90p910_wdt_start(void)
> +{
> + unsigned int val;
> +
> + spin_lock(&w90p910_wdt->wdt_lock);
> +
> + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
> + val |= (WTRE | WTIE | WTE | WTR | WTCLK | WTIF);
> + val |= (wdt_time << 0x04);
> + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
> +
> + spin_unlock(&w90p910_wdt->wdt_lock);
> +}
> +
> +static int w90p910_wdt_open(struct inode *inode, struct file *file)
> +{
> +
> + if (test_and_set_bit(0, &w90p910wdt_busy))
> + return -EBUSY;
> +
> + w90p910_wdt_start();
> + return nonseekable_open(inode, file);
> +}
> +
> +static int w90p910_wdt_close(struct inode *inode, struct file *file)
> +{
> + if (!nowayout)
> + w90p910_wdt_stop();
> +
> + clear_bit(0, &w90p910wdt_busy);
> + return 0;
> +}
> +
> +static int w90p910_wdt_settimeout(int new_time_level)
> +{
> + unsigned int val;
> +
> + if ((new_time_level < 0) || (new_time_level > WDT_MAX_TIME_LEVEL))
> + return -EINVAL;
> +
> + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
> + val &= ~WTIS;
> + val |= new_time_level;
> + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
> +
> + wdt_time = new_time_level;
> + return 0;
> +}
> +
> +static struct watchdog_info w90p910_wdt_info = {
> + .identity = "w90p910 watchdog",
> + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
> +};
> +
> +static long w90p910_wdt_ioctl(struct file *file,
> + unsigned int cmd, unsigned long arg)
> +{
> + void __user *argp = (void __user *)arg;
> + int __user *p = argp;
> + int new_value;
> +
> + switch (cmd) {
> + case WDIOC_GETSUPPORT:
> + return copy_to_user(argp, &w90p910_wdt_info,
> + sizeof(w90p910_wdt_info)) ? -EFAULT : 0;
> + case WDIOC_GETSTATUS:
> + case WDIOC_GETBOOTSTATUS:
> + return put_user(0, p);
> + case WDIOC_SETOPTIONS:
> + if (get_user(new_value, p))
> + return -EFAULT;
> + if (new_value & WDIOS_DISABLECARD)
> + w90p910_wdt_stop();
> + if (new_value & WDIOS_ENABLECARD)
> + w90p910_wdt_start();
> + return 0;
> + case WDIOC_KEEPALIVE:
> + w90p910_wdt_keepalive();
> + return 0;
> + case WDIOC_SETTIMEOUT:
> + if (get_user(new_value, p))
> + return -EFAULT;
> + if (w90p910_wdt_settimeout(new_value))
> + return -EINVAL;
> +
> + w90p910_wdt_start();
> +
> + return put_user(wdt_time, p);
> + case WDIOC_GETTIMEOUT:
> + return put_user(wdt_time, p);
> + default:
> + return -ENOTTY;
> + }
> +}
> +
> +static ssize_t w90p910_wdt_write(struct file *file, const char *data,
> + size_t len, loff_t *ppos)
> +{
> + w90p910_wdt_keepalive();
> + return len;
> +}
> +
> +static const struct file_operations w90p910wdt_fops = {
> + .owner = THIS_MODULE,
> + .llseek = no_llseek,
> + .unlocked_ioctl = w90p910_wdt_ioctl,
> + .open = w90p910_wdt_open,
> + .release = w90p910_wdt_close,
> + .write = w90p910_wdt_write,
> +};
> +
> +static struct miscdevice w90p910wdt_miscdev = {
> + .minor = WATCHDOG_MINOR,
> + .name = "watchdog",
> + .fops = &w90p910wdt_fops,
> +};
> +
> +static int __devinit w90p910wdt_probe(struct platform_device *pdev)
> +{
> + int ret;
> +
> + w90p910_wdt = kzalloc(sizeof(struct w90p910_wdt), GFP_KERNEL);
> + if (!w90p910_wdt)
> + return -ENOMEM;
> +
> + w90p910_wdt->pdev = pdev;
> +
> + w90p910_wdt->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (w90p910_wdt->res == NULL) {
> + dev_err(&pdev->dev, "no memory resource specified\n");
> + ret = -ENOENT;
> + goto err_get;
> + }
> +
> + if (!request_mem_region(w90p910_wdt->res->start,
> + resource_size(w90p910_wdt->res), pdev->name)) {
> + dev_err(&pdev->dev, "failed to get memory region\n");
> + ret = -ENOENT;
> + goto err_req;
> + }
> +
> + w90p910_wdt->wdt_base = ioremap(w90p910_wdt->res->start,
> + resource_size(w90p910_wdt->res));
> + if (w90p910_wdt->wdt_base == NULL) {
> + dev_err(&pdev->dev, "failed to ioremap() region\n");
> + ret = -EINVAL;
> + goto err_req;
> + }
> +
> + w90p910_wdt->wdt_irq = platform_get_irq(pdev, 0);
> + ret = request_irq(w90p910_wdt->wdt_irq,
> + w90p910_wdt_irq, 0, pdev->name, NULL);
> + if (ret != 0) {
> + dev_err(&pdev->dev, "failed to install irq (%d)\n", ret);
> + goto err_map;
> + }
> +
> + w90p910_wdt->wdt_clock = clk_get(&pdev->dev, NULL);
> + if (IS_ERR(w90p910_wdt->wdt_clock)) {
> + dev_err(&pdev->dev, "failed to find watchdog clock source\n");
> + ret = PTR_ERR(w90p910_wdt->wdt_clock);
> + goto err_irq;
> + }
> +
> + clk_enable(w90p910_wdt->wdt_clock);
> +
> + if (misc_register(&w90p910wdt_miscdev)) {
> + dev_err(&pdev->dev, "err register miscdev on minor=%d (%d)\n",
> + WATCHDOG_MINOR, ret);
> + goto err_clk;
> + }
> +
> + return 0;
> +
> +err_clk:
> + clk_disable(w90p910_wdt->wdt_clock);
> + clk_put(w90p910_wdt->wdt_clock);
> +err_irq:
> + free_irq(w90p910_wdt->wdt_irq, NULL);
> +err_map:
> + iounmap(w90p910_wdt->wdt_base);
> +err_req:
> + release_mem_region(w90p910_wdt->res->start,
> + resource_size(w90p910_wdt->res));
> +err_get:
> + kfree(w90p910_wdt);
> + return ret;
> +}
> +
> +static int __devexit w90p910wdt_remove(struct platform_device *pdev)
> +{
> + free_irq(w90p910_wdt->wdt_irq, NULL);
> +
> + clk_disable(w90p910_wdt->wdt_clock);
> + clk_put(w90p910_wdt->wdt_clock);
> +
> + iounmap(w90p910_wdt->wdt_base);
> +
> + release_mem_region(w90p910_wdt->res->start,
> + resource_size(w90p910_wdt->res));
> +
> + kfree(w90p910_wdt);
> +
> + misc_deregister(&w90p910wdt_miscdev);
> + return 0;
> +}
> +
> +static void w90p910wdt_shutdown(struct platform_device *pdev)
> +{
> + w90p910_wdt_stop();
> +}
> +
> +static struct platform_driver w90p910wdt_driver = {
> + .probe = w90p910wdt_probe,
> + .remove = __devexit_p(w90p910wdt_remove),
> + .shutdown = w90p910wdt_shutdown,
> + .driver = {
> + .name = "w90p910-wdt",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +static int __init w90p910_wdt_init(void)
> +{
> + return platform_driver_register(&w90p910wdt_driver);
> +}
> +
> +static void __exit w90p910_wdt_exit(void)
> +{
> + platform_driver_unregister(&w90p910wdt_driver);
> +}
> +
> +module_init(w90p910_wdt_init);
> +module_exit(w90p910_wdt_exit);
> +
> +MODULE_AUTHOR("Wan ZongShun <[email protected]>");
> +MODULE_DESCRIPTION("Watchdog driver for W90P910");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
> +MODULE_ALIAS("platform:w90p910-wdt");
> --
> 1.5.6.3
>
--
Wan z.s
Hi Wan,
will be reviewed still this week.
Kind regards,
Wim.
> Dear Wim,
>
> How about this watchdog patch?
> Would you mind applying?
>
> Thanks for your help.
>
> 2009/7/24, Wan ZongShun <[email protected]>:
> > Dear Wim Van Sebroeck,
> >
> > This is a watchdog driver for my w90p910 platform.
> >
> > Thanks!
> >
> >
> >
> > Add watchdog driver for w90p910 platform.
> >
> > Signed-off-by: Wan ZongShun <[email protected]>
> >
> > ---
> > drivers/watchdog/Kconfig | 9 +
> > drivers/watchdog/Makefile | 1 +
> > drivers/watchdog/w90p910_wdt.c | 340 ++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 350 insertions(+), 0 deletions(-)
> > create mode 100644 drivers/watchdog/w90p910_wdt.c
> >
> > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> > index b1ccc04..fba4b91 100644
> > --- a/drivers/watchdog/Kconfig
> > +++ b/drivers/watchdog/Kconfig
> > @@ -266,6 +266,15 @@ config STMP3XXX_WATCHDOG
> > To compile this driver as a module, choose M here: the
> > module will be called stmp3xxx_wdt.
> >
> > +config W90P910_WATCHDOG
> > + tristate "Nuvoton W90P910 watchdog"
> > + depends on ARCH_W90X900
> > + help
> > + Say Y here if to include support for the watchdog timer
> > + for the Nuvoton W90P910 SoC.
> > + To compile this driver as a module, choose M here: the
> > + module will be called w90p910_wdt.
> > +
> > # AVR32 Architecture
> >
> > config AT32AP700X_WDT
> > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> > index 3d77429..ecc05b4 100644
> > --- a/drivers/watchdog/Makefile
> > +++ b/drivers/watchdog/Makefile
> > @@ -44,6 +44,7 @@ obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
> > obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o
> > obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
> > obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
> > +obj-$(CONFIG_W90P910_WATCHDOG) += w90p910_wdt.o
> >
> > # AVR32 Architecture
> > obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
> > diff --git a/drivers/watchdog/w90p910_wdt.c b/drivers/watchdog/w90p910_wdt.c
> > new file mode 100644
> > index 0000000..a73f85a
> > --- /dev/null
> > +++ b/drivers/watchdog/w90p910_wdt.c
> > @@ -0,0 +1,340 @@
> > +/*
> > + * Copyright (c) 2009 Nuvoton technology corporation.
> > + *
> > + * Wan ZongShun <[email protected]>
> > + *
> > + * 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;version 2 of the License.
> > + *
> > + */
> > +
> > +#include <linux/bitops.h>
> > +#include <linux/errno.h>
> > +#include <linux/fs.h>
> > +#include <linux/init.h>
> > +#include <linux/io.h>
> > +#include <linux/clk.h>
> > +#include <linux/kernel.h>
> > +#include <linux/miscdevice.h>
> > +#include <linux/module.h>
> > +#include <linux/moduleparam.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/types.h>
> > +#include <linux/watchdog.h>
> > +#include <linux/uaccess.h>
> > +
> > +#define WDT_DEFAULT_TIME_LEVEL 0 /* if 0, time = 2^14 clocks */
> > +#define WDT_MAX_TIME_LEVEL 3 /* if 3, time = 2^20 clocks */
> > +#define REG_WTCR 0x1c
> > +#define WTCLK (0x01 << 10)
> > +#define WTE (0x01 << 7) /*wdt enable*/
> > +#define WTIE (0x01 << 6) /*wdt interrupt enable*/
> > +#define WTISBIT (0x04)
> > +#define WTIS (0x03 << 4)
> > +#define WTIF (0x01 << 3)
> > +#define WTRF (0x01 << 2)
> > +#define WTRE (0x01 << 1)
> > +#define WTR 0x01
> > +
> > +static int wdt_time = WDT_DEFAULT_TIME_LEVEL;
> > +static int nowayout = WATCHDOG_NOWAYOUT;
> > +
> > +module_param(wdt_time, int, 0);
> > +MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
> > + __MODULE_STRING(WDT_DEFAULT_TIME) ")");
> > +
> > +#ifdef CONFIG_WATCHDOG_NOWAYOUT
> > +module_param(nowayout, int, 0);
> > +MODULE_PARM_DESC(nowayout,
> > + "Watchdog cannot be stopped once started (default="
> > + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> > +#endif
> > +
> > +struct w90p910_wdt {
> > + struct resource *res;
> > + struct clk *wdt_clock;
> > + struct platform_device *pdev;
> > + unsigned int open_lock;
> > + unsigned int wdt_irq;
> > + void __iomem *wdt_base;
> > + char expect_close;
> > + spinlock_t wdt_lock;
> > +};
> > +
> > +static unsigned long w90p910wdt_busy;
> > +struct w90p910_wdt *w90p910_wdt;
> > +
> > +static void w90p910_wdt_keepalive(void)
> > +{
> > + unsigned int val;
> > +
> > + spin_lock(&w90p910_wdt->wdt_lock);
> > +
> > + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
> > + val |= (WTR | WTIF);
> > + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
> > +
> > + spin_unlock(&w90p910_wdt->wdt_lock);
> > +}
> > +
> > +static irqreturn_t w90p910_wdt_irq(int irq, void *dev_id)
> > +{
> > + w90p910_wdt_keepalive();
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static inline void w90p910_wdt_stop(void)
> > +{
> > + unsigned int val;
> > +
> > + spin_lock(&w90p910_wdt->wdt_lock);
> > +
> > + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
> > + val &= ~WTE;
> > + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
> > +
> > + spin_unlock(&w90p910_wdt->wdt_lock);
> > +}
> > +
> > +static inline void w90p910_wdt_start(void)
> > +{
> > + unsigned int val;
> > +
> > + spin_lock(&w90p910_wdt->wdt_lock);
> > +
> > + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
> > + val |= (WTRE | WTIE | WTE | WTR | WTCLK | WTIF);
> > + val |= (wdt_time << 0x04);
> > + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
> > +
> > + spin_unlock(&w90p910_wdt->wdt_lock);
> > +}
> > +
> > +static int w90p910_wdt_open(struct inode *inode, struct file *file)
> > +{
> > +
> > + if (test_and_set_bit(0, &w90p910wdt_busy))
> > + return -EBUSY;
> > +
> > + w90p910_wdt_start();
> > + return nonseekable_open(inode, file);
> > +}
> > +
> > +static int w90p910_wdt_close(struct inode *inode, struct file *file)
> > +{
> > + if (!nowayout)
> > + w90p910_wdt_stop();
> > +
> > + clear_bit(0, &w90p910wdt_busy);
> > + return 0;
> > +}
> > +
> > +static int w90p910_wdt_settimeout(int new_time_level)
> > +{
> > + unsigned int val;
> > +
> > + if ((new_time_level < 0) || (new_time_level > WDT_MAX_TIME_LEVEL))
> > + return -EINVAL;
> > +
> > + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
> > + val &= ~WTIS;
> > + val |= new_time_level;
> > + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
> > +
> > + wdt_time = new_time_level;
> > + return 0;
> > +}
> > +
> > +static struct watchdog_info w90p910_wdt_info = {
> > + .identity = "w90p910 watchdog",
> > + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
> > +};
> > +
> > +static long w90p910_wdt_ioctl(struct file *file,
> > + unsigned int cmd, unsigned long arg)
> > +{
> > + void __user *argp = (void __user *)arg;
> > + int __user *p = argp;
> > + int new_value;
> > +
> > + switch (cmd) {
> > + case WDIOC_GETSUPPORT:
> > + return copy_to_user(argp, &w90p910_wdt_info,
> > + sizeof(w90p910_wdt_info)) ? -EFAULT : 0;
> > + case WDIOC_GETSTATUS:
> > + case WDIOC_GETBOOTSTATUS:
> > + return put_user(0, p);
> > + case WDIOC_SETOPTIONS:
> > + if (get_user(new_value, p))
> > + return -EFAULT;
> > + if (new_value & WDIOS_DISABLECARD)
> > + w90p910_wdt_stop();
> > + if (new_value & WDIOS_ENABLECARD)
> > + w90p910_wdt_start();
> > + return 0;
> > + case WDIOC_KEEPALIVE:
> > + w90p910_wdt_keepalive();
> > + return 0;
> > + case WDIOC_SETTIMEOUT:
> > + if (get_user(new_value, p))
> > + return -EFAULT;
> > + if (w90p910_wdt_settimeout(new_value))
> > + return -EINVAL;
> > +
> > + w90p910_wdt_start();
> > +
> > + return put_user(wdt_time, p);
> > + case WDIOC_GETTIMEOUT:
> > + return put_user(wdt_time, p);
> > + default:
> > + return -ENOTTY;
> > + }
> > +}
> > +
> > +static ssize_t w90p910_wdt_write(struct file *file, const char *data,
> > + size_t len, loff_t *ppos)
> > +{
> > + w90p910_wdt_keepalive();
> > + return len;
> > +}
> > +
> > +static const struct file_operations w90p910wdt_fops = {
> > + .owner = THIS_MODULE,
> > + .llseek = no_llseek,
> > + .unlocked_ioctl = w90p910_wdt_ioctl,
> > + .open = w90p910_wdt_open,
> > + .release = w90p910_wdt_close,
> > + .write = w90p910_wdt_write,
> > +};
> > +
> > +static struct miscdevice w90p910wdt_miscdev = {
> > + .minor = WATCHDOG_MINOR,
> > + .name = "watchdog",
> > + .fops = &w90p910wdt_fops,
> > +};
> > +
> > +static int __devinit w90p910wdt_probe(struct platform_device *pdev)
> > +{
> > + int ret;
> > +
> > + w90p910_wdt = kzalloc(sizeof(struct w90p910_wdt), GFP_KERNEL);
> > + if (!w90p910_wdt)
> > + return -ENOMEM;
> > +
> > + w90p910_wdt->pdev = pdev;
> > +
> > + w90p910_wdt->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > + if (w90p910_wdt->res == NULL) {
> > + dev_err(&pdev->dev, "no memory resource specified\n");
> > + ret = -ENOENT;
> > + goto err_get;
> > + }
> > +
> > + if (!request_mem_region(w90p910_wdt->res->start,
> > + resource_size(w90p910_wdt->res), pdev->name)) {
> > + dev_err(&pdev->dev, "failed to get memory region\n");
> > + ret = -ENOENT;
> > + goto err_req;
> > + }
> > +
> > + w90p910_wdt->wdt_base = ioremap(w90p910_wdt->res->start,
> > + resource_size(w90p910_wdt->res));
> > + if (w90p910_wdt->wdt_base == NULL) {
> > + dev_err(&pdev->dev, "failed to ioremap() region\n");
> > + ret = -EINVAL;
> > + goto err_req;
> > + }
> > +
> > + w90p910_wdt->wdt_irq = platform_get_irq(pdev, 0);
> > + ret = request_irq(w90p910_wdt->wdt_irq,
> > + w90p910_wdt_irq, 0, pdev->name, NULL);
> > + if (ret != 0) {
> > + dev_err(&pdev->dev, "failed to install irq (%d)\n", ret);
> > + goto err_map;
> > + }
> > +
> > + w90p910_wdt->wdt_clock = clk_get(&pdev->dev, NULL);
> > + if (IS_ERR(w90p910_wdt->wdt_clock)) {
> > + dev_err(&pdev->dev, "failed to find watchdog clock source\n");
> > + ret = PTR_ERR(w90p910_wdt->wdt_clock);
> > + goto err_irq;
> > + }
> > +
> > + clk_enable(w90p910_wdt->wdt_clock);
> > +
> > + if (misc_register(&w90p910wdt_miscdev)) {
> > + dev_err(&pdev->dev, "err register miscdev on minor=%d (%d)\n",
> > + WATCHDOG_MINOR, ret);
> > + goto err_clk;
> > + }
> > +
> > + return 0;
> > +
> > +err_clk:
> > + clk_disable(w90p910_wdt->wdt_clock);
> > + clk_put(w90p910_wdt->wdt_clock);
> > +err_irq:
> > + free_irq(w90p910_wdt->wdt_irq, NULL);
> > +err_map:
> > + iounmap(w90p910_wdt->wdt_base);
> > +err_req:
> > + release_mem_region(w90p910_wdt->res->start,
> > + resource_size(w90p910_wdt->res));
> > +err_get:
> > + kfree(w90p910_wdt);
> > + return ret;
> > +}
> > +
> > +static int __devexit w90p910wdt_remove(struct platform_device *pdev)
> > +{
> > + free_irq(w90p910_wdt->wdt_irq, NULL);
> > +
> > + clk_disable(w90p910_wdt->wdt_clock);
> > + clk_put(w90p910_wdt->wdt_clock);
> > +
> > + iounmap(w90p910_wdt->wdt_base);
> > +
> > + release_mem_region(w90p910_wdt->res->start,
> > + resource_size(w90p910_wdt->res));
> > +
> > + kfree(w90p910_wdt);
> > +
> > + misc_deregister(&w90p910wdt_miscdev);
> > + return 0;
> > +}
> > +
> > +static void w90p910wdt_shutdown(struct platform_device *pdev)
> > +{
> > + w90p910_wdt_stop();
> > +}
> > +
> > +static struct platform_driver w90p910wdt_driver = {
> > + .probe = w90p910wdt_probe,
> > + .remove = __devexit_p(w90p910wdt_remove),
> > + .shutdown = w90p910wdt_shutdown,
> > + .driver = {
> > + .name = "w90p910-wdt",
> > + .owner = THIS_MODULE,
> > + },
> > +};
> > +
> > +static int __init w90p910_wdt_init(void)
> > +{
> > + return platform_driver_register(&w90p910wdt_driver);
> > +}
> > +
> > +static void __exit w90p910_wdt_exit(void)
> > +{
> > + platform_driver_unregister(&w90p910wdt_driver);
> > +}
> > +
> > +module_init(w90p910_wdt_init);
> > +module_exit(w90p910_wdt_exit);
> > +
> > +MODULE_AUTHOR("Wan ZongShun <[email protected]>");
> > +MODULE_DESCRIPTION("Watchdog driver for W90P910");
> > +MODULE_LICENSE("GPL");
> > +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
> > +MODULE_ALIAS("platform:w90p910-wdt");
> > --
> > 1.5.6.3
> >
>
>
> --
> Wan z.s
Hi Wim ,
Okay, got it, thanks a lot for your help!
2009/7/30 Wim Van Sebroeck <[email protected]>:
> Hi Wan,
>
> will be reviewed still this week.
>
> Kind regards,
> Wim.
>
>> Dear Wim,
>>
>> How about this watchdog patch?
>> Would you mind applying?
>>
>> Thanks for your help.
>>
>> 2009/7/24, Wan ZongShun <[email protected]>:
>> > Dear Wim Van Sebroeck,
>> >
>> > This is a watchdog driver for my w90p910 platform.
>> >
>> > Thanks!
>> >
>> >
>> >
>> > Add watchdog driver for w90p910 platform.
>> >
>> > Signed-off-by: Wan ZongShun <[email protected]>
>> >
>> > ---
>> > drivers/watchdog/Kconfig | 9 +
>> > drivers/watchdog/Makefile | 1 +
>> > drivers/watchdog/w90p910_wdt.c | 340 ++++++++++++++++++++++++++++++++++++++++
>> > 3 files changed, 350 insertions(+), 0 deletions(-)
>> > create mode 100644 drivers/watchdog/w90p910_wdt.c
>> >
>> > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
>> > index b1ccc04..fba4b91 100644
>> > --- a/drivers/watchdog/Kconfig
>> > +++ b/drivers/watchdog/Kconfig
>> > @@ -266,6 +266,15 @@ config STMP3XXX_WATCHDOG
>> > To compile this driver as a module, choose M here: the
>> > module will be called stmp3xxx_wdt.
>> >
>> > +config W90P910_WATCHDOG
>> > + tristate "Nuvoton W90P910 watchdog"
>> > + depends on ARCH_W90X900
>> > + help
>> > + Say Y here if to include support for the watchdog timer
>> > + for the Nuvoton W90P910 SoC.
>> > + To compile this driver as a module, choose M here: the
>> > + module will be called w90p910_wdt.
>> > +
>> > # AVR32 Architecture
>> >
>> > config AT32AP700X_WDT
>> > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
>> > index 3d77429..ecc05b4 100644
>> > --- a/drivers/watchdog/Makefile
>> > +++ b/drivers/watchdog/Makefile
>> > @@ -44,6 +44,7 @@ obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
>> > obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o
>> > obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
>> > obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
>> > +obj-$(CONFIG_W90P910_WATCHDOG) += w90p910_wdt.o
>> >
>> > # AVR32 Architecture
>> > obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
>> > diff --git a/drivers/watchdog/w90p910_wdt.c b/drivers/watchdog/w90p910_wdt.c
>> > new file mode 100644
>> > index 0000000..a73f85a
>> > --- /dev/null
>> > +++ b/drivers/watchdog/w90p910_wdt.c
>> > @@ -0,0 +1,340 @@
>> > +/*
>> > + * Copyright (c) 2009 Nuvoton technology corporation.
>> > + *
>> > + * Wan ZongShun <[email protected]>
>> > + *
>> > + * 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;version 2 of the License.
>> > + *
>> > + */
>> > +
>> > +#include <linux/bitops.h>
>> > +#include <linux/errno.h>
>> > +#include <linux/fs.h>
>> > +#include <linux/init.h>
>> > +#include <linux/io.h>
>> > +#include <linux/clk.h>
>> > +#include <linux/kernel.h>
>> > +#include <linux/miscdevice.h>
>> > +#include <linux/module.h>
>> > +#include <linux/moduleparam.h>
>> > +#include <linux/platform_device.h>
>> > +#include <linux/interrupt.h>
>> > +#include <linux/types.h>
>> > +#include <linux/watchdog.h>
>> > +#include <linux/uaccess.h>
>> > +
>> > +#define WDT_DEFAULT_TIME_LEVEL 0 /* if 0, time = 2^14 clocks */
>> > +#define WDT_MAX_TIME_LEVEL 3 /* if 3, time = 2^20 clocks */
>> > +#define REG_WTCR 0x1c
>> > +#define WTCLK (0x01 << 10)
>> > +#define WTE (0x01 << 7) /*wdt enable*/
>> > +#define WTIE (0x01 << 6) /*wdt interrupt enable*/
>> > +#define WTISBIT (0x04)
>> > +#define WTIS (0x03 << 4)
>> > +#define WTIF (0x01 << 3)
>> > +#define WTRF (0x01 << 2)
>> > +#define WTRE (0x01 << 1)
>> > +#define WTR 0x01
>> > +
>> > +static int wdt_time = WDT_DEFAULT_TIME_LEVEL;
>> > +static int nowayout = WATCHDOG_NOWAYOUT;
>> > +
>> > +module_param(wdt_time, int, 0);
>> > +MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
>> > + __MODULE_STRING(WDT_DEFAULT_TIME) ")");
>> > +
>> > +#ifdef CONFIG_WATCHDOG_NOWAYOUT
>> > +module_param(nowayout, int, 0);
>> > +MODULE_PARM_DESC(nowayout,
>> > + "Watchdog cannot be stopped once started (default="
>> > + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
>> > +#endif
>> > +
>> > +struct w90p910_wdt {
>> > + struct resource *res;
>> > + struct clk *wdt_clock;
>> > + struct platform_device *pdev;
>> > + unsigned int open_lock;
>> > + unsigned int wdt_irq;
>> > + void __iomem *wdt_base;
>> > + char expect_close;
>> > + spinlock_t wdt_lock;
>> > +};
>> > +
>> > +static unsigned long w90p910wdt_busy;
>> > +struct w90p910_wdt *w90p910_wdt;
>> > +
>> > +static void w90p910_wdt_keepalive(void)
>> > +{
>> > + unsigned int val;
>> > +
>> > + spin_lock(&w90p910_wdt->wdt_lock);
>> > +
>> > + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
>> > + val |= (WTR | WTIF);
>> > + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
>> > +
>> > + spin_unlock(&w90p910_wdt->wdt_lock);
>> > +}
>> > +
>> > +static irqreturn_t w90p910_wdt_irq(int irq, void *dev_id)
>> > +{
>> > + w90p910_wdt_keepalive();
>> > + return IRQ_HANDLED;
>> > +}
>> > +
>> > +static inline void w90p910_wdt_stop(void)
>> > +{
>> > + unsigned int val;
>> > +
>> > + spin_lock(&w90p910_wdt->wdt_lock);
>> > +
>> > + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
>> > + val &= ~WTE;
>> > + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
>> > +
>> > + spin_unlock(&w90p910_wdt->wdt_lock);
>> > +}
>> > +
>> > +static inline void w90p910_wdt_start(void)
>> > +{
>> > + unsigned int val;
>> > +
>> > + spin_lock(&w90p910_wdt->wdt_lock);
>> > +
>> > + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
>> > + val |= (WTRE | WTIE | WTE | WTR | WTCLK | WTIF);
>> > + val |= (wdt_time << 0x04);
>> > + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
>> > +
>> > + spin_unlock(&w90p910_wdt->wdt_lock);
>> > +}
>> > +
>> > +static int w90p910_wdt_open(struct inode *inode, struct file *file)
>> > +{
>> > +
>> > + if (test_and_set_bit(0, &w90p910wdt_busy))
>> > + return -EBUSY;
>> > +
>> > + w90p910_wdt_start();
>> > + return nonseekable_open(inode, file);
>> > +}
>> > +
>> > +static int w90p910_wdt_close(struct inode *inode, struct file *file)
>> > +{
>> > + if (!nowayout)
>> > + w90p910_wdt_stop();
>> > +
>> > + clear_bit(0, &w90p910wdt_busy);
>> > + return 0;
>> > +}
>> > +
>> > +static int w90p910_wdt_settimeout(int new_time_level)
>> > +{
>> > + unsigned int val;
>> > +
>> > + if ((new_time_level < 0) || (new_time_level > WDT_MAX_TIME_LEVEL))
>> > + return -EINVAL;
>> > +
>> > + val = __raw_readl(w90p910_wdt->wdt_base + REG_WTCR);
>> > + val &= ~WTIS;
>> > + val |= new_time_level;
>> > + __raw_writel(val, w90p910_wdt->wdt_base + REG_WTCR);
>> > +
>> > + wdt_time = new_time_level;
>> > + return 0;
>> > +}
>> > +
>> > +static struct watchdog_info w90p910_wdt_info = {
>> > + .identity = "w90p910 watchdog",
>> > + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
>> > +};
>> > +
>> > +static long w90p910_wdt_ioctl(struct file *file,
>> > + unsigned int cmd, unsigned long arg)
>> > +{
>> > + void __user *argp = (void __user *)arg;
>> > + int __user *p = argp;
>> > + int new_value;
>> > +
>> > + switch (cmd) {
>> > + case WDIOC_GETSUPPORT:
>> > + return copy_to_user(argp, &w90p910_wdt_info,
>> > + sizeof(w90p910_wdt_info)) ? -EFAULT : 0;
>> > + case WDIOC_GETSTATUS:
>> > + case WDIOC_GETBOOTSTATUS:
>> > + return put_user(0, p);
>> > + case WDIOC_SETOPTIONS:
>> > + if (get_user(new_value, p))
>> > + return -EFAULT;
>> > + if (new_value & WDIOS_DISABLECARD)
>> > + w90p910_wdt_stop();
>> > + if (new_value & WDIOS_ENABLECARD)
>> > + w90p910_wdt_start();
>> > + return 0;
>> > + case WDIOC_KEEPALIVE:
>> > + w90p910_wdt_keepalive();
>> > + return 0;
>> > + case WDIOC_SETTIMEOUT:
>> > + if (get_user(new_value, p))
>> > + return -EFAULT;
>> > + if (w90p910_wdt_settimeout(new_value))
>> > + return -EINVAL;
>> > +
>> > + w90p910_wdt_start();
>> > +
>> > + return put_user(wdt_time, p);
>> > + case WDIOC_GETTIMEOUT:
>> > + return put_user(wdt_time, p);
>> > + default:
>> > + return -ENOTTY;
>> > + }
>> > +}
>> > +
>> > +static ssize_t w90p910_wdt_write(struct file *file, const char *data,
>> > + size_t len, loff_t *ppos)
>> > +{
>> > + w90p910_wdt_keepalive();
>> > + return len;
>> > +}
>> > +
>> > +static const struct file_operations w90p910wdt_fops = {
>> > + .owner = THIS_MODULE,
>> > + .llseek = no_llseek,
>> > + .unlocked_ioctl = w90p910_wdt_ioctl,
>> > + .open = w90p910_wdt_open,
>> > + .release = w90p910_wdt_close,
>> > + .write = w90p910_wdt_write,
>> > +};
>> > +
>> > +static struct miscdevice w90p910wdt_miscdev = {
>> > + .minor = WATCHDOG_MINOR,
>> > + .name = "watchdog",
>> > + .fops = &w90p910wdt_fops,
>> > +};
>> > +
>> > +static int __devinit w90p910wdt_probe(struct platform_device *pdev)
>> > +{
>> > + int ret;
>> > +
>> > + w90p910_wdt = kzalloc(sizeof(struct w90p910_wdt), GFP_KERNEL);
>> > + if (!w90p910_wdt)
>> > + return -ENOMEM;
>> > +
>> > + w90p910_wdt->pdev = pdev;
>> > +
>> > + w90p910_wdt->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> > + if (w90p910_wdt->res == NULL) {
>> > + dev_err(&pdev->dev, "no memory resource specified\n");
>> > + ret = -ENOENT;
>> > + goto err_get;
>> > + }
>> > +
>> > + if (!request_mem_region(w90p910_wdt->res->start,
>> > + resource_size(w90p910_wdt->res), pdev->name)) {
>> > + dev_err(&pdev->dev, "failed to get memory region\n");
>> > + ret = -ENOENT;
>> > + goto err_req;
>> > + }
>> > +
>> > + w90p910_wdt->wdt_base = ioremap(w90p910_wdt->res->start,
>> > + resource_size(w90p910_wdt->res));
>> > + if (w90p910_wdt->wdt_base == NULL) {
>> > + dev_err(&pdev->dev, "failed to ioremap() region\n");
>> > + ret = -EINVAL;
>> > + goto err_req;
>> > + }
>> > +
>> > + w90p910_wdt->wdt_irq = platform_get_irq(pdev, 0);
>> > + ret = request_irq(w90p910_wdt->wdt_irq,
>> > + w90p910_wdt_irq, 0, pdev->name, NULL);
>> > + if (ret != 0) {
>> > + dev_err(&pdev->dev, "failed to install irq (%d)\n", ret);
>> > + goto err_map;
>> > + }
>> > +
>> > + w90p910_wdt->wdt_clock = clk_get(&pdev->dev, NULL);
>> > + if (IS_ERR(w90p910_wdt->wdt_clock)) {
>> > + dev_err(&pdev->dev, "failed to find watchdog clock source\n");
>> > + ret = PTR_ERR(w90p910_wdt->wdt_clock);
>> > + goto err_irq;
>> > + }
>> > +
>> > + clk_enable(w90p910_wdt->wdt_clock);
>> > +
>> > + if (misc_register(&w90p910wdt_miscdev)) {
>> > + dev_err(&pdev->dev, "err register miscdev on minor=%d (%d)\n",
>> > + WATCHDOG_MINOR, ret);
>> > + goto err_clk;
>> > + }
>> > +
>> > + return 0;
>> > +
>> > +err_clk:
>> > + clk_disable(w90p910_wdt->wdt_clock);
>> > + clk_put(w90p910_wdt->wdt_clock);
>> > +err_irq:
>> > + free_irq(w90p910_wdt->wdt_irq, NULL);
>> > +err_map:
>> > + iounmap(w90p910_wdt->wdt_base);
>> > +err_req:
>> > + release_mem_region(w90p910_wdt->res->start,
>> > + resource_size(w90p910_wdt->res));
>> > +err_get:
>> > + kfree(w90p910_wdt);
>> > + return ret;
>> > +}
>> > +
>> > +static int __devexit w90p910wdt_remove(struct platform_device *pdev)
>> > +{
>> > + free_irq(w90p910_wdt->wdt_irq, NULL);
>> > +
>> > + clk_disable(w90p910_wdt->wdt_clock);
>> > + clk_put(w90p910_wdt->wdt_clock);
>> > +
>> > + iounmap(w90p910_wdt->wdt_base);
>> > +
>> > + release_mem_region(w90p910_wdt->res->start,
>> > + resource_size(w90p910_wdt->res));
>> > +
>> > + kfree(w90p910_wdt);
>> > +
>> > + misc_deregister(&w90p910wdt_miscdev);
>> > + return 0;
>> > +}
>> > +
>> > +static void w90p910wdt_shutdown(struct platform_device *pdev)
>> > +{
>> > + w90p910_wdt_stop();
>> > +}
>> > +
>> > +static struct platform_driver w90p910wdt_driver = {
>> > + .probe = w90p910wdt_probe,
>> > + .remove = __devexit_p(w90p910wdt_remove),
>> > + .shutdown = w90p910wdt_shutdown,
>> > + .driver = {
>> > + .name = "w90p910-wdt",
>> > + .owner = THIS_MODULE,
>> > + },
>> > +};
>> > +
>> > +static int __init w90p910_wdt_init(void)
>> > +{
>> > + return platform_driver_register(&w90p910wdt_driver);
>> > +}
>> > +
>> > +static void __exit w90p910_wdt_exit(void)
>> > +{
>> > + platform_driver_unregister(&w90p910wdt_driver);
>> > +}
>> > +
>> > +module_init(w90p910_wdt_init);
>> > +module_exit(w90p910_wdt_exit);
>> > +
>> > +MODULE_AUTHOR("Wan ZongShun <[email protected]>");
>> > +MODULE_DESCRIPTION("Watchdog driver for W90P910");
>> > +MODULE_LICENSE("GPL");
>> > +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
>> > +MODULE_ALIAS("platform:w90p910-wdt");
>> > --
>> > 1.5.6.3
>> >
>>
>>
>> --
>> Wan z.s
>
--
Wan z.s