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Date: Thu, 30 Jul 2009 13:03:39 +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
Hi Wim ,
Okay, got it, thanks a lot for your help!
2009/7/30 Wim Van Sebroeck <wim@...ana.be>:
> 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 <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
>
--
Wan z.s
--
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