111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*
|
|
* include/asm-sh/watchdog.h
|
|
*
|
|
* Copyright (C) 2002, 2003 Paul Mundt
|
|
*
|
|
* 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.
|
|
*/
|
|
#ifndef __ASM_SH_WATCHDOG_H
|
|
#define __ASM_SH_WATCHDOG_H
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/types.h>
|
|
#include <asm/cpu/watchdog.h>
|
|
#include <asm/io.h>
|
|
|
|
/*
|
|
* See asm/cpu-sh2/watchdog.h for explanation of this stupidity..
|
|
*/
|
|
#ifndef WTCNT_R
|
|
# define WTCNT_R WTCNT
|
|
#endif
|
|
|
|
#ifndef WTCSR_R
|
|
# define WTCSR_R WTCSR
|
|
#endif
|
|
|
|
#define WTCNT_HIGH 0x5a
|
|
#define WTCSR_HIGH 0xa5
|
|
|
|
#define WTCSR_CKS2 0x04
|
|
#define WTCSR_CKS1 0x02
|
|
#define WTCSR_CKS0 0x01
|
|
|
|
/*
|
|
* CKS0-2 supports a number of clock division ratios. At the time the watchdog
|
|
* is enabled, it defaults to a 41 usec overflow period .. we overload this to
|
|
* something a little more reasonable, and really can't deal with anything
|
|
* lower than WTCSR_CKS_1024, else we drop back into the usec range.
|
|
*
|
|
* Clock Division Ratio Overflow Period
|
|
* --------------------------------------------
|
|
* 1/32 (initial value) 41 usecs
|
|
* 1/64 82 usecs
|
|
* 1/128 164 usecs
|
|
* 1/256 328 usecs
|
|
* 1/512 656 usecs
|
|
* 1/1024 1.31 msecs
|
|
* 1/2048 2.62 msecs
|
|
* 1/4096 5.25 msecs
|
|
*/
|
|
#define WTCSR_CKS_32 0x00
|
|
#define WTCSR_CKS_64 0x01
|
|
#define WTCSR_CKS_128 0x02
|
|
#define WTCSR_CKS_256 0x03
|
|
#define WTCSR_CKS_512 0x04
|
|
#define WTCSR_CKS_1024 0x05
|
|
#define WTCSR_CKS_2048 0x06
|
|
#define WTCSR_CKS_4096 0x07
|
|
|
|
/**
|
|
* sh_wdt_read_cnt - Read from Counter
|
|
*
|
|
* Reads back the WTCNT value.
|
|
*/
|
|
static inline __u8 sh_wdt_read_cnt(void)
|
|
{
|
|
return ctrl_inb(WTCNT_R);
|
|
}
|
|
|
|
/**
|
|
* sh_wdt_write_cnt - Write to Counter
|
|
*
|
|
* @val: Value to write
|
|
*
|
|
* Writes the given value @val to the lower byte of the timer counter.
|
|
* The upper byte is set manually on each write.
|
|
*/
|
|
static inline void sh_wdt_write_cnt(__u8 val)
|
|
{
|
|
ctrl_outw((WTCNT_HIGH << 8) | (__u16)val, WTCNT);
|
|
}
|
|
|
|
/**
|
|
* sh_wdt_read_csr - Read from Control/Status Register
|
|
*
|
|
* Reads back the WTCSR value.
|
|
*/
|
|
static inline __u8 sh_wdt_read_csr(void)
|
|
{
|
|
return ctrl_inb(WTCSR_R);
|
|
}
|
|
|
|
/**
|
|
* sh_wdt_write_csr - Write to Control/Status Register
|
|
*
|
|
* @val: Value to write
|
|
*
|
|
* Writes the given value @val to the lower byte of the control/status
|
|
* register. The upper byte is set manually on each write.
|
|
*/
|
|
static inline void sh_wdt_write_csr(__u8 val)
|
|
{
|
|
ctrl_outw((WTCSR_HIGH << 8) | (__u16)val, WTCSR);
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* __ASM_SH_WATCHDOG_H */
|