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