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/*
* 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 <cpu/watchdog.h>
#include <asm/io.h>
/*
* See 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 */
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