diff options
author | blogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2007-08-05 16:26:47 +0000 |
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committer | blogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2007-08-05 16:26:47 +0000 |
commit | 94040edc4564cd2419a4d0898fdece22d0d205ea (patch) | |
tree | e005b2b8d846b670715427a31c6d3c5fc976c309 /target/linux/amazon-2.6/files/drivers/char/amazon_wdt.c | |
parent | 1d7f1aafa1e498345a75b7cfe7acd3c74d71505b (diff) |
added improved watchdog driver for amazon
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@8346 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/amazon-2.6/files/drivers/char/amazon_wdt.c')
-rw-r--r-- | target/linux/amazon-2.6/files/drivers/char/amazon_wdt.c | 261 |
1 files changed, 0 insertions, 261 deletions
diff --git a/target/linux/amazon-2.6/files/drivers/char/amazon_wdt.c b/target/linux/amazon-2.6/files/drivers/char/amazon_wdt.c deleted file mode 100644 index c6a90f07b..000000000 --- a/target/linux/amazon-2.6/files/drivers/char/amazon_wdt.c +++ /dev/null @@ -1,261 +0,0 @@ -/* - * Infineon AP DC COM Amazon WDT driver - * Copyright 2004 Wu Qi Ming <gokimi@msn.com> - * All rights reserved - */ -#if defined(MODVERSIONS) -#include <linux/modversions.h> -#endif - -#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 AMAZON_WDT_EMSG(fmt, args...) printk( "%s: " fmt, __FUNCTION__ , ##args) - -extern unsigned int amazon_get_fpi_hz(void); - -/* forward declarations for _fops */ -static ssize_t wdt_read(struct file *file, char *buf, size_t count, loff_t *offset); -static ssize_t wdt_write(struct file *file, const char *buf, size_t count, loff_t *offset); -static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg); -static int wdt_open(struct inode *inode, struct file *file); -static int wdt_release(struct inode *inode, struct file *file); -static int wdt_proc_read(char *buf, char **start, off_t offset,int count, int *eof, void *data); - - -static struct file_operations wdt_fops = { - read:wdt_read, - write:wdt_write, - ioctl:wdt_ioctl, - open:wdt_open, - release:wdt_release, -}; - -/* data */ -static struct wdt_dev *amazon_wdt_dev; -static struct proc_dir_entry* amazon_wdt_dir; -static int occupied=0; - - -/* Brief: enable WDT - * Parameter: - timeout: time interval for WDT - * Return: - 0 OK - EINVAL - * Describes: - 1. Password Access - 2. Modify Access (change ENDINIT => 0) - 3. Change WDT_CON1 (enable WDT) - 4. Password Access again - 5. Modify Access (change ENDINIT => 1) - */ -int wdt_enable(int timeout) -{ - u32 hard_psw,ffpi; - int reload_value, divider=0; - - ffpi = amazon_get_fpi_hz(); - - divider = 1; - if((reload_value=65536-timeout*ffpi/256)<0){ - divider = 0; - reload_value=65536-timeout*ffpi/16384; - } - if (reload_value < 0){ - AMAZON_WDT_EMSG("timeout too large %d\n", timeout); - return -EINVAL; - } - - AMAZON_WDT_EMSG("timeout:%d reload_value: %8x\n", timeout, reload_value); - - hard_psw=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff01)+(AMAZON_WDT_REG32(AMAZON_WDT_CON1)&0xc)+ 0xf0; - AMAZON_WDT_REG32(AMAZON_WDT_CON0)=hard_psw; - wmb(); - - AMAZON_WDT_REG32(AMAZON_WDT_CON0)=(hard_psw&0xff00)+(reload_value<<16)+0xf2; - wmb(); - - AMAZON_WDT_REG32(AMAZON_WDT_CON1)=divider<<2; - wmb(); - - hard_psw=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff01)+(AMAZON_WDT_REG32(AMAZON_WDT_CON1)&0xc)+ 0xf0; - AMAZON_WDT_REG32(AMAZON_WDT_CON0)=hard_psw; - - wmb(); - AMAZON_WDT_REG32(AMAZON_WDT_CON0)=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff00)+0xf3; - wmb(); - return 0; -} - -/* Brief: Disable/stop WDT - */ -void wdt_disable(void) -{ - u32 hard_psw=0; - - hard_psw=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff01)+(AMAZON_WDT_REG32(AMAZON_WDT_CON1)&0xc)+ 0xf0; - AMAZON_WDT_REG32(AMAZON_WDT_CON0)=hard_psw; - wmb(); - - AMAZON_WDT_REG32(AMAZON_WDT_CON0)=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff00)+0xf2; - wmb(); - - AMAZON_WDT_REG32(AMAZON_WDT_CON1)|=8; - wmb(); - - hard_psw=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff01)+(AMAZON_WDT_REG32(AMAZON_WDT_CON1)&0xc)+ 0xf0; - AMAZON_WDT_REG32(AMAZON_WDT_CON0)=hard_psw; - wmb(); - - AMAZON_WDT_REG32(AMAZON_WDT_CON0)=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff00)+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: - AMAZON_WDT_DMSG("enable watch dog timer!\n"); - if ( copy_from_user((void*)&timeout, (void*)arg, sizeof (int)) ){ - AMAZON_WDT_EMSG("invalid argument\n"); - result=-EINVAL; - }else{ - if ((result = wdt_enable(timeout)) < 0){ - timeout = -1; - } - } - break; - case AMAZON_WDT_IOC_STOP: - AMAZON_WDT_DMSG("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); - } - } - 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) -{ - AMAZON_WDT_DMSG("wdt_open\n"); - - if (occupied == 1) return -EBUSY; - occupied = 1; - - return 0; -} - -static int wdt_release(struct inode *inode, struct file *file) -{ - AMAZON_WDT_DMSG("wdt_release\n"); - - occupied = 0; - return 0; -} - - -int wdt_register_proc_read(char *buf, char **start, off_t offset, - int count, int *eof, void *data) -{ - int len=0; - printk("wdt_registers:\n"); - 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; -} - - -int __init amazon_wdt_init_module(void) -{ - int result=0; - - amazon_wdt_dev = (wdt_dev*)kmalloc(sizeof(wdt_dev),GFP_KERNEL); - if (amazon_wdt_dev == NULL){ - return -ENOMEM; - } - memset(amazon_wdt_dev,0,sizeof(wdt_dev)); - - amazon_wdt_dev->major=result; - strcpy(amazon_wdt_dev->name,"wdt"); - - result = register_chrdev(0,amazon_wdt_dev->name,&wdt_fops); - if (result < 0) { - AMAZON_WDT_EMSG("cannot register device\n"); - kfree(amazon_wdt_dev); - return result; - } - - amazon_wdt_dir=proc_mkdir("amazon_wdt",NULL); - create_proc_read_entry("wdt_register", - 0, - amazon_wdt_dir, - wdt_register_proc_read, - NULL); - - occupied=0; - return 0; -} - -void amazon_wdt_cleanup_module(void) -{ - unregister_chrdev(amazon_wdt_dev->major,amazon_wdt_dev->name); - kfree(amazon_wdt_dev); - remove_proc_entry("wdt_register",amazon_wdt_dir); - remove_proc_entry("amazon_wdt",NULL); - AMAZON_WDT_DMSG("unloaded\n"); - return; -} - -MODULE_LICENSE ("GPL"); -MODULE_AUTHOR("Infineon IFAP DC COM"); -MODULE_DESCRIPTION("AMAZON WDT driver"); - -module_init(amazon_wdt_init_module); -module_exit(amazon_wdt_cleanup_module); - |