+++ /dev/null
-/*
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
- * Based on EP93xx and ifxmips wdt driver
- */
-
-#include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
-#include <linux/fs.h>
-#include <linux/ioport.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <asm/addrspace.h>
-#include <ar531x.h>
-
-#define CLOCK_RATE 40000000
-#define HEARTBEAT(x) (x < 1 || x > 90)?(20):(x)
-
-static int wdt_timeout = 20;
-static int started = 0;
-static int in_use = 0;
-
-static void
-ar2315_wdt_enable(void)
-{
- sysRegWrite(AR5315_WD, wdt_timeout * CLOCK_RATE);
- sysRegWrite(AR5315_ISR, 0x80);
-}
-
-static ssize_t
-ar2315_wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos)
-{
- if(len)
- ar2315_wdt_enable();
- return len;
-}
-
-static int
-ar2315_wdt_open(struct inode *inode, struct file *file)
-{
- if(in_use)
- return -EBUSY;
- ar2315_wdt_enable();
- in_use = started = 1;
- return nonseekable_open(inode, file);
-}
-
-static int
-ar2315_wdt_release(struct inode *inode, struct file *file)
-{
- in_use = 0;
- return 0;
-}
-
-static irqreturn_t
-ar2315_wdt_interrupt(int irq, void *dev_id)
-{
- if(started)
- {
- printk(KERN_CRIT "watchdog expired, rebooting system\n");
- emergency_restart();
- } else {
- sysRegWrite(AR5315_WDC, 0);
- sysRegWrite(AR5315_WD, 0);
- sysRegWrite(AR5315_ISR, 0x80);
- }
- return IRQ_HANDLED;
-}
-
-static struct watchdog_info ident = {
- .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
- .identity = "ar2315 Watchdog",
-};
-
-static int
-ar2315_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
-{
- int new_wdt_timeout;
- int ret = -ENOIOCTLCMD;
-
- switch(cmd)
- {
- case WDIOC_GETSUPPORT:
- ret = copy_to_user((struct watchdog_info __user *)arg, &ident, sizeof(ident)) ? -EFAULT : 0;
- break;
-
- case WDIOC_KEEPALIVE:
- ar2315_wdt_enable();
- ret = 0;
- break;
-
- case WDIOC_SETTIMEOUT:
- if((ret = get_user(new_wdt_timeout, (int __user *)arg)))
- break;
- wdt_timeout = HEARTBEAT(new_wdt_timeout);
- ar2315_wdt_enable();
- break;
-
- case WDIOC_GETTIMEOUT:
- ret = put_user(wdt_timeout, (int __user *)arg);
- break;
- }
- return ret;
-}
-
-static struct file_operations ar2315_wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = ar2315_wdt_write,
- .ioctl = ar2315_wdt_ioctl,
- .open = ar2315_wdt_open,
- .release = ar2315_wdt_release,
-};
-
-static struct miscdevice ar2315_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &ar2315_wdt_fops,
-};
-
-static int
-ar2315_wdt_probe(struct platform_device *dev)
-{
- int ret = 0;
-
- ar2315_wdt_enable();
- ret = request_irq(AR531X_MISC_IRQ_WATCHDOG, ar2315_wdt_interrupt, IRQF_DISABLED, "ar2315_wdt", NULL);
- if(ret)
- {
- printk(KERN_ERR "ar2315wdt: failed to register inetrrupt\n");
- goto out;
- }
-
- ret = misc_register(&ar2315_wdt_miscdev);
- if(ret)
- printk(KERN_ERR "ar2315wdt: failed to register miscdev\n");
-
-out:
- return ret;
-}
-
-static int
-ar2315_wdt_remove(struct platform_device *dev)
-{
- misc_deregister(&ar2315_wdt_miscdev);
- free_irq(AR531X_MISC_IRQ_WATCHDOG, NULL);
- return 0;
-}
-
-static struct platform_driver ar2315_wdt_driver = {
- .probe = ar2315_wdt_probe,
- .remove = ar2315_wdt_remove,
- .driver = {
- .name = "ar2315_wdt",
- .owner = THIS_MODULE,
- },
-};
-
-static int __init
-init_ar2315_wdt(void)
-{
- int ret = platform_driver_register(&ar2315_wdt_driver);
- if(ret)
- printk(KERN_INFO "ar2315_wdt: error registering platfom driver!");
- return ret;
-}
-
-static void __exit
-exit_ar2315_wdt(void)
-{
- platform_driver_unregister(&ar2315_wdt_driver);
-}
-
-module_init(init_ar2315_wdt);
-module_exit(exit_ar2315_wdt);
projects / openwrt / svn-archive / archive.git / blobdiff