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Date: Thu, 30 Jul 2009 09:17:45 +0800
From: Wan ZongShun <mcuos.com@...il.com>
To: Wim Van Sebroeck <wim@...ana.be>
Cc: linux-arm-kernel <linux-arm-kernel@...ts.arm.linux.org.uk>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Add watchdog driver for w90p910
Dear Wim,
How about this watchdog patch?
Would you mind applying?
Thanks for your help.
2009/7/24, Wan ZongShun <mcuos.com@...il.com>:
> 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 <mcuos.com@...il.com>
>
> ---
> 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 <mcuos.com@...il.com>
> + *
> + * 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 <mcuos.com@...il.com>");
> +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
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