mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-14 16:32:49 +02:00
17c7b6c3fd
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@8653 3c298f89-4303-0410-b956-a3cf2f4a3e73
247 lines
6.2 KiB
C
247 lines
6.2 KiB
C
/*
|
|
* 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/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 <asm/amazon/amazon.h>
|
|
#include <asm/amazon/amazon_wdt.h>
|
|
|
|
#define DRV_NAME "AMAZON WDT:"
|
|
|
|
#undef AMAZON_WDT_DEBUG
|
|
|
|
extern unsigned int amazon_get_fpi_hz(void);
|
|
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;
|
|
}
|
|
|
|
static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
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,
|
|
ioctl: wdt_ioctl,
|
|
open: wdt_open,
|
|
release: wdt_release,
|
|
};
|
|
|
|
int __init amazon_wdt_init_module(void)
|
|
{
|
|
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");
|
|
return 0;
|
|
}
|
|
|
|
void amazon_wdt_cleanup_module(void)
|
|
{
|
|
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");
|
|
return;
|
|
}
|
|
|
|
MODULE_LICENSE ("GPL");
|
|
MODULE_AUTHOR("Infineon / John Crispin <blogic@openwrt.org>");
|
|
MODULE_DESCRIPTION("AMAZON WDT driver");
|
|
|
|
module_init(amazon_wdt_init_module);
|
|
module_exit(amazon_wdt_cleanup_module);
|
|
|