+++ /dev/null
-/*
- * 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);
projects / openwrt.git / blobdiff