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278 lines
6.9 KiB
C
278 lines
6.9 KiB
C
/*
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Copyright 2004 Wu Qi Ming <gokimi@msn.com>
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* Copyright (C) 2007 John Crispin <blogic@openwrt.org>
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*/
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#include <linux/version.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/fs.h>
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#include <linux/errno.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/tty.h>
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#include <linux/selection.h>
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#include <linux/kmod.h>
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#include <linux/vmalloc.h>
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#include <linux/kdev_t.h>
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#include <linux/ioctl.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/platform_device.h>
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#include <asm/amazon/amazon.h>
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#include <asm/amazon/amazon_wdt.h>
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#define DRV_NAME "AMAZON WDT:"
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#undef AMAZON_WDT_DEBUG
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static int amazon_wdt_isopen = 0;
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#ifdef AMAZON_WDT_DEBUG
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static struct proc_dir_entry* amazon_wdt_dir;
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#endif
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int wdt_enable(int timeout)
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{
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u32 hard_psw, ffpi;
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int reload_value, divider = 1;
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ffpi = amazon_get_fpi_hz();
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reload_value = 65536 - timeout * ffpi / 256;
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if (reload_value < 0) {
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divider = 0;
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reload_value = 65536 - timeout * ffpi / 16384;
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}
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if (reload_value < 0){
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printk(KERN_INFO DRV_NAME "timeout too large %d\n", timeout);
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return -EINVAL;
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}
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printk(KERN_INFO DRV_NAME "timeout:%d reload_value: %8x\n", timeout, reload_value);
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hard_psw = (amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) +
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(amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;
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amazon_writel(hard_psw, AMAZON_WDT_CON0);
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wmb();
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amazon_writel((hard_psw & 0xff00) + (reload_value << 16) + 0xf2, AMAZON_WDT_CON0);
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wmb();
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amazon_writel(divider << 2, AMAZON_WDT_CON1);
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wmb();
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hard_psw = (amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) +
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(amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;
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amazon_writel(hard_psw, AMAZON_WDT_CON0);
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wmb();
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amazon_writel_masked(AMAZON_WDT_CON0, 0xff, 0xf3);
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wmb();
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return 0;
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}
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void wdt_disable(void)
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{
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u32 hard_psw = 0;
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hard_psw = (amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) +
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(amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;
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amazon_writel(hard_psw, AMAZON_WDT_CON0);
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wmb();
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amazon_writel_masked(AMAZON_WDT_CON0, 0xff, 0xf2);
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wmb();
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amazon_writel_masked(AMAZON_WDT_CON1, 0x8, 0x8);
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wmb();
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hard_psw=(amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) +
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(amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;
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amazon_writel(hard_psw, AMAZON_WDT_CON0);
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wmb();
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amazon_writel_masked(AMAZON_WDT_CON0, 0xff, 0xf3);
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wmb();
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return;
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}
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36))
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static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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#else
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static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
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#endif
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{
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int result=0;
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static int timeout=-1;
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switch(cmd){
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case AMAZON_WDT_IOC_START:
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printk(KERN_INFO DRV_NAME "enable watch dog timer!\n");
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if (copy_from_user((void*)&timeout, (void*)arg, sizeof (int))) {
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printk(KERN_INFO DRV_NAME "invalid argument\n");
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result=-EINVAL;
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} else if ((result = wdt_enable(timeout)) < 0) {
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timeout = -1;
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}
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break;
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case AMAZON_WDT_IOC_STOP:
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printk(KERN_INFO DRV_NAME "disable watch dog timer\n");
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timeout = -1;
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wdt_disable();
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break;
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case AMAZON_WDT_IOC_PING:
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if (timeout < 0) {
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result = -EIO;
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} else {
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result = wdt_enable(timeout);
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}
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break;
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default:
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result=-EINVAL;
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break;
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}
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return result;
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}
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static ssize_t wdt_read(struct file *file, char *buf, size_t count, loff_t *offset)
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{
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return 0;
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}
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static ssize_t wdt_write(struct file *file, const char *buf, size_t count, loff_t *offset)
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{
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return count;
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}
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static int wdt_open(struct inode *inode, struct file *file)
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{
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if (amazon_wdt_isopen == 1)
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return -EBUSY;
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amazon_wdt_isopen = 1;
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printk(KERN_INFO DRV_NAME "opened\n");
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return 0;
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}
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static int wdt_release(struct inode *inode, struct file *file)
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{
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amazon_wdt_isopen = 0;
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printk(KERN_INFO DRV_NAME "closed\n");
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return 0;
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}
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#ifdef AMAZON_WDT_DEBUG
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int wdt_register_proc_read(char *buf, char **start, off_t offset,
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int count, int *eof, void *data)
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{
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int len=0;
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len+=sprintf(buf+len,"NMISR: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_NMISR));
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len+=sprintf(buf+len,"RST_REQ: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_RST_REQ));
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len+=sprintf(buf+len,"RST_SR: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_RST_SR));
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len+=sprintf(buf+len,"WDT_CON0: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_CON0));
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len+=sprintf(buf+len,"WDT_CON1: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_CON1));
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len+=sprintf(buf+len,"WDT_SR: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_SR));
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*eof = 1;
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return len;
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}
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#endif
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static struct file_operations wdt_fops = {
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read: wdt_read,
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write: wdt_write,
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36))
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unlocked_ioctl: wdt_ioctl,
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#else
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ioctl: wdt_ioctl,
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#endif
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open: wdt_open,
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release: wdt_release,
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};
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static int amazon_wdt_probe(struct platform_device *dev)
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{
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int result = result = register_chrdev(0, "watchdog", &wdt_fops);
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if (result < 0) {
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printk(KERN_INFO DRV_NAME "cannot register device\n");
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return result;
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}
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#ifdef AMAZON_WDT_DEBUG
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amazon_wdt_dir=proc_mkdir("amazon_wdt",NULL);
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create_proc_read_entry("wdt_register", 0, amazon_wdt_dir,
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wdt_register_proc_read, NULL);
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#endif
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amazon_wdt_isopen=0;
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printk(KERN_INFO DRV_NAME "driver loaded but inactive\n");
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return 0;
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}
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static int amazon_wdt_remove(struct platform_device *dev)
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{
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unregister_chrdev(0, "watchdog");
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#ifdef AMAZON_WDT_DEBUG
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remove_proc_entry("wdt_register", amazon_wdt_dir);
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remove_proc_entry("amazon_wdt", NULL);
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#endif
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printk(KERN_INFO DRV_NAME "unregistered\n");
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return 0;
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}
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static struct platform_driver amazon_wdt_driver = {
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.probe = amazon_wdt_probe,
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.remove = amazon_wdt_remove,
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.driver = {
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.name = "amazon_wdt",
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.owner = THIS_MODULE,
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},
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};
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static int __init amazon_wdt_init(void)
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{
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int ret = platform_driver_register(&amazon_wdt_driver);
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if (ret)
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printk(KERN_WARNING "amazon_wdt: error registering platfom driver!\n");
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return ret;
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}
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static void __exit amazon_wdt_exit(void)
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{
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platform_driver_unregister(&amazon_wdt_driver);
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}
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module_init(amazon_wdt_init);
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module_exit(amazon_wdt_exit);
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MODULE_LICENSE ("GPL");
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MODULE_AUTHOR("Infineon / John Crispin <blogic@openwrt.org>");
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MODULE_DESCRIPTION("AMAZON WDT driver");
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