mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-28 15:46:16 +02:00
b5b6a2bb85
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7100 3c298f89-4303-0410-b956-a3cf2f4a3e73
281 lines
7.0 KiB
C
281 lines
7.0 KiB
C
/*
|
|
* Driver for the MTX-1 Watchdog.
|
|
*
|
|
* (c) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved.
|
|
* http://www.4g-systems.biz
|
|
*
|
|
* (C) Copyright 2007 OpenWrt.org, Florian Fainelli <florian@openwrt.org>
|
|
*
|
|
* 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.
|
|
*
|
|
* Neither Michael Stickel nor 4G Systems admit liability nor provide
|
|
* warranty for any of this software. This material is provided
|
|
* "AS-IS" and at no charge.
|
|
*
|
|
* (c) Copyright 2005 4G Systems <info@4g-systems.biz>
|
|
*
|
|
* Release 0.01.
|
|
*
|
|
* Author: Michael Stickel michael.stickel@4g-systems.biz
|
|
*
|
|
* Release 0.02.
|
|
* Author: Florian Fainelli florian@openwrt.org
|
|
* use the Linux watchdog API
|
|
*
|
|
* The Watchdog is configured to reset the MTX-1
|
|
* if it is not triggered for 100 seconds.
|
|
* It should not be triggered more often than 1.6 seconds.
|
|
*
|
|
* A timer triggers the watchdog every 5 seconds, until
|
|
* it is opened for the first time. After the first open
|
|
* it MUST be triggered every 2..95 seconds.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/types.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/init.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/watchdog.h>
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#include <asm/mach-au1x00/au1000.h>
|
|
|
|
#define MTX1_WDT_INTERVAL (5 * HZ)
|
|
|
|
static int ticks = 100 * HZ;
|
|
|
|
static struct {
|
|
struct completion stop;
|
|
volatile int running;
|
|
struct timer_list timer;
|
|
volatile int queue;
|
|
int default_ticks;
|
|
unsigned long inuse;
|
|
} mtx1_wdt_device;
|
|
|
|
static void mtx1_wdt_trigger(unsigned long unused)
|
|
{
|
|
u32 tmp;
|
|
|
|
if (mtx1_wdt_device.running)
|
|
ticks--;
|
|
/*
|
|
* toggle GPIO2_15
|
|
*/
|
|
tmp = au_readl(GPIO2_DIR);
|
|
tmp = (tmp & ~(1<<15)) | ((~tmp) & (1<<15));
|
|
au_writel (tmp, GPIO2_DIR);
|
|
|
|
if (mtx1_wdt_device.queue && ticks)
|
|
mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
|
|
else {
|
|
complete(&mtx1_wdt_device.stop);
|
|
}
|
|
}
|
|
|
|
static void mtx1_wdt_reset(void)
|
|
{
|
|
ticks = mtx1_wdt_device.default_ticks;
|
|
}
|
|
|
|
|
|
static void mtx1_wdt_start(void)
|
|
{
|
|
if (!mtx1_wdt_device.queue) {
|
|
mtx1_wdt_device.queue = 1;
|
|
au_writel (au_readl(GPIO2_DIR) | (u32)(1<<15), GPIO2_DIR);
|
|
mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
|
|
}
|
|
mtx1_wdt_device.running++;
|
|
}
|
|
|
|
static int mtx1_wdt_stop(void)
|
|
{
|
|
if (mtx1_wdt_device.queue) {
|
|
mtx1_wdt_device.queue = 0;
|
|
au_writel (au_readl(GPIO2_DIR) & ~((u32)(1<<15)), GPIO2_DIR);
|
|
}
|
|
|
|
ticks = mtx1_wdt_device.default_ticks;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Filesystem functions */
|
|
|
|
static char restart_after_close;
|
|
|
|
static int mtx1_wdt_open(struct inode *inode, struct file *file)
|
|
{
|
|
if (test_and_set_bit(0, &mtx1_wdt_device.inuse))
|
|
return -EBUSY;
|
|
|
|
return nonseekable_open(inode, file);
|
|
}
|
|
|
|
|
|
static int mtx1_wdt_release(struct inode *inode, struct file *file)
|
|
{
|
|
clear_bit(0, &mtx1_wdt_device.inuse);
|
|
return 0;
|
|
}
|
|
|
|
static int mtx1_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
unsigned int value;
|
|
static struct watchdog_info ident =
|
|
{
|
|
.options = WDIOF_CARDRESET,
|
|
.identity = "MTX-1 WDT",
|
|
};
|
|
|
|
switch(cmd) {
|
|
case WDIOC_KEEPALIVE:
|
|
mtx1_wdt_reset();
|
|
break;
|
|
case WDIOC_GETSTATUS:
|
|
if ( copy_to_user(argp, &value, sizeof(int)) )
|
|
return -EFAULT;
|
|
break;
|
|
case WDIOC_GETSUPPORT:
|
|
if ( copy_to_user(argp, &ident, sizeof(ident)) )
|
|
return -EFAULT;
|
|
break;
|
|
case WDIOC_SETOPTIONS:
|
|
if ( copy_from_user(&value, argp, sizeof(int)) )
|
|
return -EFAULT;
|
|
switch(value) {
|
|
case WDIOS_ENABLECARD:
|
|
mtx1_wdt_start();
|
|
break;
|
|
case WDIOS_DISABLECARD:
|
|
return mtx1_wdt_stop();
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static ssize_t mtx1_wdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
|
|
{
|
|
if (!count)
|
|
return -EIO;
|
|
|
|
mtx1_wdt_reset();
|
|
|
|
if (count > 0) {
|
|
char buffer[10];
|
|
int n = (count>9)?9:count;
|
|
|
|
if (copy_from_user (&buffer, buf, n))
|
|
return -EFAULT;
|
|
buffer[n]=0;
|
|
|
|
if (count >= 4 && strncmp("auto", buffer, 4)==0)
|
|
restart_after_close = 1;
|
|
|
|
else if (count >= 6 && strncmp("manual", buffer, 6)==0)
|
|
restart_after_close = 0;
|
|
|
|
return n;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
#if 0
|
|
static ssize_t mtx1_wdt_read (struct file *file, char *buf, size_t count, loff_t *ppos)
|
|
{
|
|
char * state = restart_after_close ? "auto\n" : "manual\n";
|
|
int n = strlen(state)+1;
|
|
|
|
if (file->f_pos >= n)
|
|
return 0;
|
|
|
|
if (count < n)
|
|
return -EINVAL;
|
|
|
|
if(copy_to_user(buf, state, n))
|
|
return -EFAULT;
|
|
|
|
file->f_pos += n;
|
|
|
|
return n;
|
|
}
|
|
#endif
|
|
|
|
static struct file_operations mtx1_wdt_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.ioctl = mtx1_wdt_ioctl,
|
|
.open = mtx1_wdt_open,
|
|
.write = mtx1_wdt_write,
|
|
//.read = mtx1_wdt_read,
|
|
.release = mtx1_wdt_release
|
|
};
|
|
|
|
|
|
static struct miscdevice mtx1_wdt_misc = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &mtx1_wdt_fops
|
|
};
|
|
|
|
|
|
static int __init mtx1_wdt_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if ((ret = misc_register(&mtx1_wdt_misc)) < 0) {
|
|
printk(KERN_ERR " mtx-1_wdt : failed to register\n");
|
|
return ret;
|
|
}
|
|
|
|
init_completion(&mtx1_wdt_device.stop);
|
|
mtx1_wdt_device.queue = 0;
|
|
|
|
clear_bit(0, &mtx1_wdt_device.inuse);
|
|
|
|
setup_timer(&mtx1_wdt_device.timer, mtx1_wdt_trigger, 0L);
|
|
|
|
mtx1_wdt_device.default_ticks = ticks;
|
|
|
|
mtx1_wdt_start();
|
|
|
|
printk(KERN_INFO "MTX-1 Watchdog driver\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit mtx1_wdt_exit(void)
|
|
{
|
|
if (mtx1_wdt_device.queue) {
|
|
mtx1_wdt_device.queue = 0;
|
|
wait_for_completion(&mtx1_wdt_device.stop);
|
|
}
|
|
misc_deregister(&mtx1_wdt_misc);
|
|
}
|
|
|
|
module_init(mtx1_wdt_init);
|
|
module_exit(mtx1_wdt_exit);
|
|
|
|
MODULE_AUTHOR("Michael Stickel, Florian Fainelli");
|
|
MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");
|
|
MODULE_LICENSE("GPL");
|