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/*

 * 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

 * Copyright (C) 2002  Maciej W. Rozycki

 */

#ifndef _ASM_MC146818RTC_H

#define _ASM_MC146818RTC_H

#include <linux/config.h>

#include <asm/io.h>

/*

 * 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;

/*

 * Most supported machines access the RTC index register via an ISA

 * port access but the way to access the date register differs ...

 * The DECstation directly maps the RTC memory in the CPU's address

 * space with the chipset generating necessary index write/data access

 * cycles automagically.

 */

#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()

#ifdef CONFIG_DECSTATION

#include <asm/dec/rtc-dec.h>

#else

#define RTC_PORT(x)     (0x70 + (x))

#define RTC_IRQ         8

#endif

#endif /* _ASM_MC146818RTC_H */