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/* $Id: mc146818rtc.h,v 1.2 1998/06/30 00:23:10 ralf Exp $
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Machine dependent access functions for RTC registers.
*
* Copyright (C) 1996, 1997, 1998 Ralf Baechle
*/
#ifndef _ASM_MC146818RTC_H
#define _ASM_MC146818RTC_H
#include <asm/io.h>
#ifndef RTC_PORT
#define RTC_PORT(x) (0x70 + (x))
#endif
/*
* The yet supported machines all access the RTC index register via
* an ISA port access but the way to access the date register differs ...
*/
#define CMOS_READ(addr) ({ \
rtc_ops->rtc_read_data(addr); \
})
#define CMOS_WRITE(val, addr) ({ \
rtc_ops->rtc_write_data(val, addr); \
})
#define RTC_ALWAYS_BCD \
rtc_ops->rtc_bcd_mode()
/*
* This structure defines how to access various features of
* different machine types and how to access them.
*/
struct rtc_ops {
/* How to access the RTC register in a DS1287. */
unsigned char (*rtc_read_data)(unsigned long addr);
void (*rtc_write_data)(unsigned char data, unsigned long addr);
int (*rtc_bcd_mode)(void);
};
extern struct rtc_ops *rtc_ops;
#endif /* _ASM_MC146818RTC_H */
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