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