+++ /dev/null
-/*
- * Watchdog driver for the BCM963xx devices
- *
- * Copyright (C) 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.
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/miscdevice.h>
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <linux/notifier.h>
-#include <linux/watchdog.h>
-#include <linux/timer.h>
-#include <linux/jiffies.h>
-#include <linux/completion.h>
-#include <linux/ioport.h>
-
-typedef struct bcm963xx_timer {
- unsigned short unused0;
- unsigned char timer_mask;
-#define TIMER0EN 0x01
-#define TIMER1EN 0x02
-#define TIMER2EN 0x04
- unsigned char timer_ints;
-#define TIMER0 0x01
-#define TIMER1 0x02
-#define TIMER2 0x04
-#define WATCHDOG 0x08
- unsigned long timer_ctl0;
- unsigned long timer_ctl1;
- unsigned long timer_ctl2;
-#define TIMERENABLE 0x80000000
-#define RSTCNTCLR 0x40000000
- unsigned long timer_cnt0;
- unsigned long timer_cnt1;
- unsigned long timer_cnt2;
- unsigned long wdt_def_count;
-
- /* Write 0xff00 0x00ff to Start timer
- * Write 0xee00 0x00ee to Stop and re-load default count
- * Read from this register returns current watch dog count
- */
- unsigned long wdt_ctl;
-
- /* Number of 40-MHz ticks for WD Reset pulse to last */
- unsigned long wdt_rst_count;
-} bcm963xx_timer;
-
-static struct bcm963xx_wdt_device {
- struct completion stop;
- volatile int running;
- struct timer_list timer;
- volatile int queue;
- int default_ticks;
- unsigned long inuse;
-} bcm963xx_wdt_device;
-
-static int ticks = 1000;
-
-#define WDT_BASE 0xfffe0200
-#define WDT ((volatile bcm963xx_timer * const) WDT_BASE)
-
-#define BCM963XX_INTERVAL (HZ/10+1)
-
-static void bcm963xx_wdt_trigger(unsigned long unused)
-{
- if (bcm963xx_wdt_device.running)
- ticks--;
-
- /* Load the default ticking value into the reset counter register */
- WDT->wdt_rst_count = bcm963xx_wdt_device.default_ticks;
-
- if (bcm963xx_wdt_device.queue && ticks) {
- bcm963xx_wdt_device.timer.expires = jiffies + BCM963XX_INTERVAL;
- add_timer(&bcm963xx_wdt_device.timer);
- }
- else {
- complete(&bcm963xx_wdt_device.stop);
- }
-}
-
-static void bcm963xx_wdt_reset(void)
-{
- ticks = bcm963xx_wdt_device.default_ticks;
- /* Also reload default count */
- WDT->wdt_def_count = ticks;
- WDT->wdt_ctl = 0xee00;
- WDT->wdt_ctl = 0x00ee;
-}
-
-static void bcm963xx_wdt_start(void)
-{
- if (!bcm963xx_wdt_device.queue) {
- bcm963xx_wdt_device.queue;
- /* Enable the watchdog by writing 0xff00 ,then 0x00ff to the control register */
- WDT->wdt_ctl = 0xff00;
- WDT->wdt_ctl = 0x00ff;
- bcm963xx_wdt_device.timer.expires = jiffies + BCM963XX_INTERVAL;
- add_timer(&bcm963xx_wdt_device.timer);
- }
- bcm963xx_wdt_device.running++;
-}
-
-static int bcm963xx_wdt_stop(void)
-{
- if (bcm963xx_wdt_device.running)
- bcm963xx_wdt_device.running = 0;
-
- ticks = bcm963xx_wdt_device.default_ticks;
-
- /* Stop the watchdog by writing 0xee00 then 0x00ee to the control register */
- WDT->wdt_ctl = 0xee00;
- WDT->wdt_ctl = 0x00ee;
-
- return -EIO;
-}
-
-static int bcm963xx_wdt_open(struct inode *inode, struct file *file)
-{
- if (test_and_set_bit(0, &bcm963xx_wdt_device.inuse))
- return -EBUSY;
- return nonseekable_open(inode, file);
-}
-
-static int bcm963xx_wdt_release(struct inode *inode, struct file *file)
-{
- clear_bit(0, &bcm963xx_wdt_device.inuse);
- return 0;
-}
-
-static int bcm963xx_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 = "BCM963xx WDT",
- };
-
- switch (cmd) {
- case WDIOC_KEEPALIVE:
- bcm963xx_wdt_reset();
- break;
- case WDIOC_GETSTATUS:
- /* Reading from the control register will return the current value */
- value = WDT->wdt_ctl;
- 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:
- bcm963xx_wdt_start();
- break;
- case WDIOS_DISABLECARD:
- bcm963xx_wdt_stop();
- break;
- default:
- return -EINVAL;
- }
- break;
- default:
- return -ENOTTY;
- }
- return 0;
-}
-
-static int bcm963xx_wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
-{
- if (!count)
- return -EIO;
- bcm963xx_wdt_reset();
- return count;
-}
-
-static const struct file_operations bcm963xx_wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = bcm963xx_wdt_write,
- .ioctl = bcm963xx_wdt_ioctl,
- .open = bcm963xx_wdt_open,
- .release = bcm963xx_wdt_release,
-};
-
-static struct miscdevice bcm963xx_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &bcm963xx_wdt_fops,
-};
-
-static void __exit bcm963xx_wdt_exit(void)
-{
- if (bcm963xx_wdt_device.queue ){
- bcm963xx_wdt_device.queue = 0;
- wait_for_completion(&bcm963xx_wdt_device.stop);
- }
- misc_deregister(&bcm963xx_wdt_miscdev);
-}
-
-static int __init bcm963xx_wdt_init(void)
-{
- int ret = 0;
-
- printk("Broadcom BCM963xx Watchdog timer\n");
-
- ret = misc_register(&bcm963xx_wdt_miscdev);
- if (ret) {
- printk(KERN_CRIT "Cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, ret);
- return ret;
- }
- init_completion(&bcm963xx_wdt_device.stop);
- bcm963xx_wdt_device.queue = 0;
-
- clear_bit(0, &bcm963xx_wdt_device.inuse);
-
- init_timer(&bcm963xx_wdt_device.timer);
- bcm963xx_wdt_device.timer.function = bcm963xx_wdt_trigger;
- bcm963xx_wdt_device.timer.data = 0;
-
- bcm963xx_wdt_device.default_ticks = ticks;
- return ret;
-}
-
-
-module_init(bcm963xx_wdt_init);
-module_exit(bcm963xx_wdt_exit);
-
-MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
-MODULE_DESCRIPTION("Broadcom BCM963xx Watchdog driver");
-MODULE_LICENSE("GPL");
projects / openwrt.git / blobdiff