diff options
Diffstat (limited to 'target/linux/ar71xx/files-2.6.39/drivers/watchdog/ar71xx_wdt.c')
| -rw-r--r-- | target/linux/ar71xx/files-2.6.39/drivers/watchdog/ar71xx_wdt.c | 305 |
1 files changed, 0 insertions, 305 deletions
diff --git a/target/linux/ar71xx/files-2.6.39/drivers/watchdog/ar71xx_wdt.c b/target/linux/ar71xx/files-2.6.39/drivers/watchdog/ar71xx_wdt.c deleted file mode 100644 index d5e1f8a3c..000000000 --- a/target/linux/ar71xx/files-2.6.39/drivers/watchdog/ar71xx_wdt.c +++ /dev/null @@ -1,305 +0,0 @@ -/* - * Driver for the Atheros AR71xx SoC's built-in hardware watchdog timer. - * - * Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com> - * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org> - * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> - * - * Parts of this file are based on Atheros 2.6.31 BSP - * - * This driver was based on: drivers/watchdog/ixp4xx_wdt.c - * Author: Deepak Saxena <dsaxena@plexity.net> - * Copyright 2004 (c) MontaVista, Software, Inc. - * - * which again was based on sa1100 driver, - * Copyright (C) 2000 Oleg Drokin <green@crimea.edu> - * - * 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. - * - */ - -#include <linux/bitops.h> -#include <linux/errno.h> -#include <linux/fs.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/miscdevice.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/platform_device.h> -#include <linux/types.h> -#include <linux/watchdog.h> -#include <linux/delay.h> - -#include <asm/mach-ar71xx/ar71xx.h> - -#define DRV_NAME "ar71xx-wdt" -#define DRV_DESC "Atheros AR71xx hardware watchdog driver" -#define DRV_VERSION "0.1.0" - -#define WDT_TIMEOUT 15 /* seconds */ - -static int nowayout = WATCHDOG_NOWAYOUT; - -#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 - -static unsigned long wdt_flags; - -#define WDT_FLAGS_BUSY 0 -#define WDT_FLAGS_EXPECT_CLOSE 1 - -static int wdt_timeout = WDT_TIMEOUT; -static int boot_status; -static int max_timeout; -static u32 wdt_clk_freq; - -static inline void ar71xx_wdt_keepalive(void) -{ - ar71xx_reset_wr(AR71XX_RESET_REG_WDOG, wdt_clk_freq * wdt_timeout); -} - -static inline void ar71xx_wdt_enable(void) -{ - printk(KERN_DEBUG DRV_NAME ": enabling watchdog timer\n"); - ar71xx_wdt_keepalive(); - udelay(2); - ar71xx_reset_wr(AR71XX_RESET_REG_WDOG_CTRL, WDOG_CTRL_ACTION_FCR); -} - -static inline void ar71xx_wdt_disable(void) -{ - printk(KERN_DEBUG DRV_NAME ": disabling watchdog timer\n"); - ar71xx_reset_wr(AR71XX_RESET_REG_WDOG_CTRL, WDOG_CTRL_ACTION_NONE); -} - -static int ar71xx_wdt_set_timeout(int val) -{ - if (val < 1 || val > max_timeout) - return -EINVAL; - - wdt_timeout = val; - ar71xx_wdt_keepalive(); - - printk(KERN_DEBUG DRV_NAME ": timeout=%d secs\n", wdt_timeout); - - return 0; -} - -static int ar71xx_wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(WDT_FLAGS_BUSY, &wdt_flags)) - return -EBUSY; - - clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags); - - ar71xx_wdt_enable(); - - return nonseekable_open(inode, file); -} - -static int ar71xx_wdt_release(struct inode *inode, struct file *file) -{ - if (test_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags)) { - ar71xx_wdt_disable(); - } else { - printk(KERN_CRIT DRV_NAME ": device closed unexpectedly, " - "watchdog timer will not stop!\n"); - } - - clear_bit(WDT_FLAGS_BUSY, &wdt_flags); - clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags); - - return 0; -} - -static ssize_t ar71xx_wdt_write(struct file *file, const char *data, - size_t len, loff_t *ppos) -{ - if (len) { - if (!nowayout) { - size_t i; - - clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags); - - for (i = 0; i != len; i++) { - char c; - - if (get_user(c, data + i)) - return -EFAULT; - - if (c == 'V') - set_bit(WDT_FLAGS_EXPECT_CLOSE, - &wdt_flags); - } - } - - ar71xx_wdt_keepalive(); - } - - return len; -} - -static struct watchdog_info ar71xx_wdt_info = { - .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | - WDIOF_MAGICCLOSE | WDIOF_CARDRESET, - .firmware_version = 0, - .identity = "AR71XX watchdog", -}; - -static long ar71xx_wdt_ioctl(struct file *file, - unsigned int cmd, unsigned long arg) -{ - int t; - int ret; - - switch (cmd) { - case WDIOC_GETSUPPORT: - ret = copy_to_user((struct watchdog_info *)arg, - &ar71xx_wdt_info, - sizeof(ar71xx_wdt_info)) ? -EFAULT : 0; - break; - - case WDIOC_GETSTATUS: - ret = put_user(0, (int *)arg) ? -EFAULT : 0; - break; - - case WDIOC_GETBOOTSTATUS: - ret = put_user(boot_status, (int *)arg) ? -EFAULT : 0; - break; - - case WDIOC_KEEPALIVE: - ar71xx_wdt_keepalive(); - ret = 0; - break; - - case WDIOC_SETTIMEOUT: - ret = get_user(t, (int *)arg) ? -EFAULT : 0; - if (ret) - break; - - ret = ar71xx_wdt_set_timeout(t); - if (ret) - break; - - /* fallthrough */ - case WDIOC_GETTIMEOUT: - ret = put_user(wdt_timeout, (int *)arg) ? -EFAULT : 0; - break; - - default: - ret = -ENOTTY; - break; - } - - return ret; -} - -static const struct file_operations ar71xx_wdt_fops = { - .owner = THIS_MODULE, - .write = ar71xx_wdt_write, - .unlocked_ioctl = ar71xx_wdt_ioctl, - .open = ar71xx_wdt_open, - .release = ar71xx_wdt_release, -}; - -static struct miscdevice ar71xx_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &ar71xx_wdt_fops, -}; - -static int __devinit ar71xx_wdt_probe(struct platform_device *pdev) -{ - int ret; - - switch (ar71xx_soc) { - case AR71XX_SOC_AR7130: - case AR71XX_SOC_AR7141: - case AR71XX_SOC_AR7161: - case AR71XX_SOC_AR7240: - case AR71XX_SOC_AR7241: - case AR71XX_SOC_AR7242: - case AR71XX_SOC_AR9130: - case AR71XX_SOC_AR9132: - wdt_clk_freq = ar71xx_ahb_freq; - break; - - case AR71XX_SOC_AR9330: - case AR71XX_SOC_AR9331: - case AR71XX_SOC_AR9341: - case AR71XX_SOC_AR9342: - case AR71XX_SOC_AR9344: - wdt_clk_freq = ar71xx_ref_freq; - break; - - default: - BUG(); - } - - max_timeout = (0xfffffffful / wdt_clk_freq); - wdt_timeout = (max_timeout < WDT_TIMEOUT) ? max_timeout : WDT_TIMEOUT; - - if (ar71xx_reset_rr(AR71XX_RESET_REG_WDOG_CTRL) & WDOG_CTRL_LAST_RESET) - boot_status = WDIOF_CARDRESET; - - ret = misc_register(&ar71xx_wdt_miscdev); - if (ret) - goto err_out; - - printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n"); - - printk(KERN_DEBUG DRV_NAME ": timeout=%d secs (max=%d)\n", - wdt_timeout, max_timeout); - - return 0; - -err_out: - return ret; -} - -static int __devexit ar71xx_wdt_remove(struct platform_device *pdev) -{ - misc_deregister(&ar71xx_wdt_miscdev); - return 0; -} - -static void ar71xx_wdt_shutdown(struct platform_device *pdev) -{ - ar71xx_wdt_disable(); -} - -static struct platform_driver ar71xx_wdt_driver = { - .probe = ar71xx_wdt_probe, - .remove = __devexit_p(ar71xx_wdt_remove), - .shutdown = ar71xx_wdt_shutdown, - .driver = { - .name = DRV_NAME, - .owner = THIS_MODULE, - }, -}; - -static int __init ar71xx_wdt_init(void) -{ - return platform_driver_register(&ar71xx_wdt_driver); -} -module_init(ar71xx_wdt_init); - -static void __exit ar71xx_wdt_exit(void) -{ - platform_driver_unregister(&ar71xx_wdt_driver); -} -module_exit(ar71xx_wdt_exit); - -MODULE_DESCRIPTION(DRV_DESC); -MODULE_VERSION(DRV_VERSION); -MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org"); -MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS("platform:" DRV_NAME); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |