+++ /dev/null
-/*
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Copyright 2004 Wu Qi Ming <gokimi@msn.com>
- * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
- */
-
-#include <linux/version.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/timer.h>
-#include <linux/fs.h>
-#include <linux/errno.h>
-#include <linux/proc_fs.h>
-#include <linux/stat.h>
-#include <linux/tty.h>
-#include <linux/selection.h>
-#include <linux/kmod.h>
-#include <linux/vmalloc.h>
-#include <linux/kdev_t.h>
-#include <linux/ioctl.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <linux/platform_device.h>
-#include <asm/amazon/amazon.h>
-#include <asm/amazon/amazon_wdt.h>
-
-#define DRV_NAME "AMAZON WDT:"
-
-#undef AMAZON_WDT_DEBUG
-
-static int amazon_wdt_isopen = 0;
-
-#ifdef AMAZON_WDT_DEBUG
-static struct proc_dir_entry* amazon_wdt_dir;
-#endif
-
-int wdt_enable(int timeout)
-{
- u32 hard_psw, ffpi;
- int reload_value, divider = 1;
-
- ffpi = amazon_get_fpi_hz();
-
- reload_value = 65536 - timeout * ffpi / 256;
-
- if (reload_value < 0) {
- divider = 0;
- reload_value = 65536 - timeout * ffpi / 16384;
- }
-
- if (reload_value < 0){
- printk(KERN_INFO DRV_NAME "timeout too large %d\n", timeout);
- return -EINVAL;
- }
-
- printk(KERN_INFO DRV_NAME "timeout:%d reload_value: %8x\n", timeout, reload_value);
-
- hard_psw = (amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) +
- (amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;
- amazon_writel(hard_psw, AMAZON_WDT_CON0);
- wmb();
-
- amazon_writel((hard_psw & 0xff00) + (reload_value << 16) + 0xf2, AMAZON_WDT_CON0);
- wmb();
-
- amazon_writel(divider << 2, AMAZON_WDT_CON1);
- wmb();
-
- hard_psw = (amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) +
- (amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;
- amazon_writel(hard_psw, AMAZON_WDT_CON0);
- wmb();
-
- amazon_writel_masked(AMAZON_WDT_CON0, 0xff, 0xf3);
- wmb();
- return 0;
-}
-
-void wdt_disable(void)
-{
- u32 hard_psw = 0;
-
- hard_psw = (amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) +
- (amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;
- amazon_writel(hard_psw, AMAZON_WDT_CON0);
- wmb();
-
- amazon_writel_masked(AMAZON_WDT_CON0, 0xff, 0xf2);
- wmb();
-
- amazon_writel_masked(AMAZON_WDT_CON1, 0x8, 0x8);
- wmb();
-
- hard_psw=(amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) +
- (amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;
- amazon_writel(hard_psw, AMAZON_WDT_CON0);
- wmb();
-
- amazon_writel_masked(AMAZON_WDT_CON0, 0xff, 0xf3);
- wmb();
-
- return;
-}
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36))
-static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-#else
-static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
-#endif
-{
- int result=0;
- static int timeout=-1;
-
- switch(cmd){
- case AMAZON_WDT_IOC_START:
- printk(KERN_INFO DRV_NAME "enable watch dog timer!\n");
- if (copy_from_user((void*)&timeout, (void*)arg, sizeof (int))) {
- printk(KERN_INFO DRV_NAME "invalid argument\n");
- result=-EINVAL;
- } else if ((result = wdt_enable(timeout)) < 0) {
- timeout = -1;
- }
- break;
-
- case AMAZON_WDT_IOC_STOP:
- printk(KERN_INFO DRV_NAME "disable watch dog timer\n");
- timeout = -1;
- wdt_disable();
- break;
-
- case AMAZON_WDT_IOC_PING:
- if (timeout < 0) {
- result = -EIO;
- } else {
- result = wdt_enable(timeout);
- }
- break;
-
- default:
- result=-EINVAL;
- break;
- }
- return result;
-}
-
-static ssize_t wdt_read(struct file *file, char *buf, size_t count, loff_t *offset)
-{
- return 0;
-}
-
-static ssize_t wdt_write(struct file *file, const char *buf, size_t count, loff_t *offset)
-{
- return count;
-}
-
-static int wdt_open(struct inode *inode, struct file *file)
-{
- if (amazon_wdt_isopen == 1)
- return -EBUSY;
-
- amazon_wdt_isopen = 1;
- printk(KERN_INFO DRV_NAME "opened\n");
- return 0;
-}
-
-static int wdt_release(struct inode *inode, struct file *file)
-{
- amazon_wdt_isopen = 0;
- printk(KERN_INFO DRV_NAME "closed\n");
- return 0;
-}
-
-#ifdef AMAZON_WDT_DEBUG
-int wdt_register_proc_read(char *buf, char **start, off_t offset,
- int count, int *eof, void *data)
-{
- int len=0;
- len+=sprintf(buf+len,"NMISR: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_NMISR));
- len+=sprintf(buf+len,"RST_REQ: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_RST_REQ));
- len+=sprintf(buf+len,"RST_SR: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_RST_SR));
- len+=sprintf(buf+len,"WDT_CON0: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_CON0));
- len+=sprintf(buf+len,"WDT_CON1: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_CON1));
- len+=sprintf(buf+len,"WDT_SR: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_SR));
- *eof = 1;
- return len;
-}
-#endif
-
-static struct file_operations wdt_fops = {
- read: wdt_read,
- write: wdt_write,
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36))
- unlocked_ioctl: wdt_ioctl,
-#else
- ioctl: wdt_ioctl,
-#endif
- open: wdt_open,
- release: wdt_release,
-};
-
-static int amazon_wdt_probe(struct platform_device *dev)
-{
- int result = result = register_chrdev(0, "watchdog", &wdt_fops);
-
- if (result < 0) {
- printk(KERN_INFO DRV_NAME "cannot register device\n");
- return result;
- }
-
-#ifdef AMAZON_WDT_DEBUG
- amazon_wdt_dir=proc_mkdir("amazon_wdt",NULL);
- create_proc_read_entry("wdt_register", 0, amazon_wdt_dir,
- wdt_register_proc_read, NULL);
-#endif
-
- amazon_wdt_isopen=0;
- printk(KERN_INFO DRV_NAME "driver loaded but inactive\n");
- return 0;
-}
-
-static int amazon_wdt_remove(struct platform_device *dev)
-{
- unregister_chrdev(0, "watchdog");
-#ifdef AMAZON_WDT_DEBUG
- remove_proc_entry("wdt_register", amazon_wdt_dir);
- remove_proc_entry("amazon_wdt", NULL);
-#endif
- printk(KERN_INFO DRV_NAME "unregistered\n");
- return 0;
-}
-
-static struct platform_driver amazon_wdt_driver = {
- .probe = amazon_wdt_probe,
- .remove = amazon_wdt_remove,
- .driver = {
- .name = "amazon_wdt",
- .owner = THIS_MODULE,
- },
-};
-
-static int __init amazon_wdt_init(void)
-{
- int ret = platform_driver_register(&amazon_wdt_driver);
- if (ret)
- printk(KERN_WARNING "amazon_wdt: error registering platfom driver!\n");
- return ret;
-}
-
-static void __exit amazon_wdt_exit(void)
-{
- platform_driver_unregister(&amazon_wdt_driver);
-}
-
-module_init(amazon_wdt_init);
-module_exit(amazon_wdt_exit);
-
-MODULE_LICENSE ("GPL");
-MODULE_AUTHOR("Infineon / John Crispin <blogic@openwrt.org>");
-MODULE_DESCRIPTION("AMAZON WDT driver");
-
projects / openwrt / svn-archive / archive.git / blobdiff