From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752651AbZGXPGr (ORCPT ); Fri, 24 Jul 2009 11:06:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751798AbZGXPGr (ORCPT ); Fri, 24 Jul 2009 11:06:47 -0400 Received: from rv-out-0506.google.com ([209.85.198.234]:57890 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751026AbZGXPGq (ORCPT ); Fri, 24 Jul 2009 11:06:46 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :content-type:content-transfer-encoding; b=JjGY5vbYbhK1EwlQAW790A2n7QFnVvD6KKzYjsrHgYVdZuKFvNq3p6YRaB755cOGZo thYuzxipbsSnPKsS4xh89900iGFXZBamyB+m2ZJVEu/C8EILm+cCTd/GUjKvfyyonYz6 qKC3qGungxiDjWkHXqEK3WeB9udYwo9897ZbE= Message-ID: <4A69CE00.10401@gmail.com> Date: Fri, 24 Jul 2009 23:06:40 +0800 From: Wan ZongShun User-Agent: Thunderbird 2.0.0.21 (X11/20090318) MIME-Version: 1.0 To: Wim Van Sebroeck CC: linux-arm-kernel , linux-kernel Subject: [PATCH] Add watchdog driver for w90p910 Content-Type: text/plain; charset=GB2312 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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 + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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 "); +MODULE_DESCRIPTION("Watchdog driver for W90P910"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); +MODULE_ALIAS("platform:w90p910-wdt"); -- 1.5.6.3