/* SPDX-License-Identifier: GPL-2.0
*
* include / asm - sh / cpu - sh2 / watchdog . h
*
* Copyright ( C ) 2002 , 2003 Paul Mundt
*/
#ifndef __ASM_CPU_SH2_WATCHDOG_H
#define __ASM_CPU_SH2_WATCHDOG_H
/*
* More SH - 2 brilliance . . its not good enough that we can ' t read
* and write the same sizes to WTCNT , now we have to read and write
* with different sizes at different addresses for WTCNT _ and_ RSTCSR .
*
* At least on the bright side no one has managed to screw over WTCSR
* in this fashion . . yet .
*/
/* Register definitions */
#define WTCNT 0 xfffffe80
#define WTCSR 0 xfffffe80
#define RSTCSR 0 xfffffe82
#define WTCNT_R (WTCNT + 1 )
#define RSTCSR_R (RSTCSR + 1 )
/* Bit definitions */
#define WTCSR_IOVF 0 x80
#define WTCSR_WT 0 x40
#define WTCSR_TME 0 x20
#define WTCSR_RSTS 0 x00
#define RSTCSR_RSTS 0 x20
/**
* sh_wdt_read_rstcsr - Read from Reset Control / Status Register
*
* Reads back the RSTCSR value .
*/
static inline __u8 sh_wdt_read_rstcsr(void )
{
/*
* Same read / write brain - damage as for WTCNT here . .
*/
return __raw_readb(RSTCSR_R);
}
/**
* sh_wdt_write_csr - Write to Reset 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_rstcsr(__u8 val)
{
/*
* Note : Due to the brain - damaged nature of this register ,
* we can ' t presently touch the WOVF bit , since the upper byte
* has to be swapped for this . So just leave it alone . .
*/
__raw_writeb((WTCNT_HIGH << 8 ) | (__u16)val, RSTCSR);
}
#endif /* __ASM_CPU_SH2_WATCHDOG_H */
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