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