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