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/*
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* RDC321x watchdog driver |
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* |
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* Copyright (C) 2007 Florian Fainelli <florian@openwrt.org> |
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* |
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* This driver is highly inspired from the rdc321x_wdt driver |
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* |
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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., 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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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/platform_device.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-rdc/rdc321x_defs.h> |
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#define RDC_WDT_MASK 0x80000000 /* Mask */ |
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#define RDC_WDT_EN 0x00800000 /* Enable bit */ |
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#define RDC_WDT_WTI 0x00200000 /* Generate a CPU reset/NMI/WDT irq when WDT timeout is reached */ |
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#define RDC_WDT_RST 0x00100000 /* Reset bit */ |
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#define RDC_WDT_WIF 0x00040000 /* WDT IRQ Flag */ |
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#define RDC_WDT_IRT 0x00000100 /* IRQ Routing table */ |
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#define RDC_WDT_CNT 0x00000001 /* WDT count */ |
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#define RDC_CLS_TMR 0x80003844 /* Clear timer */ |
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#define RDC_WDT_INTERVAL (HZ/10+1) |
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int nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, int, 0); |
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
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static int ticks = 1000; |
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/* some device data */ |
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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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} rdc321x_wdt_device; |
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/* generic helper functions */ |
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static void rdc321x_wdt_trigger(unsigned long unused) |
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{ |
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if( rdc321x_wdt_device.running ) |
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ticks--; |
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/* keep watchdog alive */ |
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outl(RDC_WDT_EN|inl(RDC3210_CFGREG_DATA), RDC3210_CFGREG_DATA);
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/* requeue?? */ |
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if (rdc321x_wdt_device.queue && ticks) |
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mod_timer(&rdc321x_wdt_device.timer, jiffies + RDC_WDT_INTERVAL); |
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else { |
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/* ticks doesn't matter anyway */ |
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complete(&rdc321x_wdt_device.stop); |
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} |
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} |
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static void rdc321x_wdt_reset(void) |
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{ |
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ticks = rdc321x_wdt_device.default_ticks; |
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} |
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static void rdc321x_wdt_start(void) |
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{ |
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if (!rdc321x_wdt_device.queue) { |
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rdc321x_wdt_device.queue = 1; |
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/* Clear the timer */ |
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outl(RDC_CLS_TMR, RDC3210_CFGREG_ADDR); |
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/* Enable watchdog and set the timeout to 81.92 us */ |
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outl(RDC_WDT_EN|RDC_WDT_CNT, RDC3210_CFGREG_DATA); |
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mod_timer(&rdc321x_wdt_device.timer, jiffies + RDC_WDT_INTERVAL); |
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} |
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/* if process dies, counter is not decremented */ |
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rdc321x_wdt_device.running++; |
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} |
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static int rdc321x_wdt_stop(void) |
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{ |
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if (rdc321x_wdt_device.running) |
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rdc321x_wdt_device.running = 0; |
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ticks = rdc321x_wdt_device.default_ticks; |
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return -EIO; |
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} |
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/* filesystem operations */ |
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static int rdc321x_wdt_open(struct inode *inode, struct file *file) |
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{ |
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if (test_and_set_bit(0, &rdc321x_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 rdc321x_wdt_release(struct inode *inode, struct file *file) |
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{ |
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clear_bit(0, &rdc321x_wdt_device.inuse); |
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return 0; |
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} |
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static int rdc321x_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 = "RDC321x WDT", |
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}; |
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switch(cmd) { |
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case WDIOC_KEEPALIVE: |
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rdc321x_wdt_reset(); |
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break; |
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case WDIOC_GETSTATUS: |
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/* Read the value from the DATA register */ |
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value = inl(RDC3210_CFGREG_DATA); |
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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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rdc321x_wdt_start(); |
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break; |
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case WDIOS_DISABLECARD: |
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return rdc321x_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 rdc321x_wdt_write(struct file *file, const char __user *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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rdc321x_wdt_reset(); |
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return count; |
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} |
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static const struct file_operations rdc321x_wdt_fops = { |
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.owner = THIS_MODULE, |
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.llseek = no_llseek, |
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.ioctl = rdc321x_wdt_ioctl, |
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.open = rdc321x_wdt_open, |
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.write = rdc321x_wdt_write, |
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.release = rdc321x_wdt_release, |
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}; |
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static struct miscdevice rdc321x_wdt_misc = { |
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.minor = WATCHDOG_MINOR, |
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.name = "watchdog", |
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.fops = &rdc321x_wdt_fops, |
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}; |
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static int __devinit rdc321x_wdt_probe(struct platform_device *pdev) |
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{ |
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int err; |
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if ( (err = misc_register(&rdc321x_wdt_misc)) < 0 ) { |
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printk(KERN_ERR PFX "misc_register failed\n"); |
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goto no_misc; |
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} |
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/* Reset the watchdog */ |
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outl(RDC_WDT_RST, RDC3210_CFGREG_DATA); |
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init_completion(&rdc321x_wdt_device.stop); |
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rdc321x_wdt_device.queue = 0; |
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clear_bit(0, &rdc321x_wdt_device.inuse); |
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setup_timer(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0); |
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rdc321x_wdt_device.default_ticks = ticks; |
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printk(KERN_INFO PFX "init success\n"); |
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return 0; |
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no_misc: |
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return err; |
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} |
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static int rdc321x_wdt_remove(struct platform_device *pdev) |
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{ |
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if (rdc321x_wdt_device.queue) { |
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rdc321x_wdt_device.queue = 0; |
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wait_for_completion(&rdc321x_wdt_device.stop); |
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} |
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misc_deregister(&rdc321x_wdt_misc); |
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return 0; |
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} |
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static struct platform_driver rdc321x_wdt_driver = { |
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.probe = rdc321x_wdt_probe, |
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.remove = rdc321x_wdt_remove, |
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.driver = { |
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.owner = THIS_MODULE, |
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.name = "rdc321x_wdt", |
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}, |
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}; |
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static int __init rdc321x_wdt_init(void) |
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{ |
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return platform_driver_register(&rdc321x_wdt_driver); |
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} |
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static void __exit rdc321x_wdt_exit(void) |
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{ |
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platform_driver_unregister(&rdc321x_wdt_driver); |
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} |
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module_init(rdc321x_wdt_init); |
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module_exit(rdc321x_wdt_exit); |
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MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); |
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MODULE_DESCRIPTION("RDC321x watchdog driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
Florian Fainelli
17 years ago