ds1742rtc.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:2k
- /* $Id: ds1742rtc.h,v 1.1 2002/02/27 18:57:58 marcelo Exp $
- *
- * ds1742rtc.h - register definitions for the Real-Time-Clock / CMOS RAM
- *
- * Based on include/asm-mips/ds1643rtc.h.
- *
- * Copyright (C) 1999-2001 Toshiba Corporation
- * It was written to be part of the Linux operating system.
- */
- /* permission is hereby granted to copy, modify and redistribute this code
- * in terms of the GNU Library General Public License, Version 2 or later,
- * at your option.
- */
- #ifndef _DS1742RTC_H
- #define _DS1742RTC_H
- #include <linux/rtc.h>
- #include <asm/mc146818rtc.h> /* bad name... */
- #define RTC_BRAM_SIZE 0x800
- #define RTC_OFFSET 0x7f8
- /**********************************************************************
- * register summary
- **********************************************************************/
- #define RTC_CONTROL (RTC_OFFSET + 0)
- #define RTC_CENTURY (RTC_OFFSET + 0)
- #define RTC_SECONDS (RTC_OFFSET + 1)
- #define RTC_MINUTES (RTC_OFFSET + 2)
- #define RTC_HOURS (RTC_OFFSET + 3)
- #define RTC_DAY (RTC_OFFSET + 4)
- #define RTC_DATE (RTC_OFFSET + 5)
- #define RTC_MONTH (RTC_OFFSET + 6)
- #define RTC_YEAR (RTC_OFFSET + 7)
- #define RTC_CENTURY_MASK 0x3f
- #define RTC_SECONDS_MASK 0x7f
- #define RTC_DAY_MASK 0x07
- /*
- * Bits in the Control/Century register
- */
- #define RTC_WRITE 0x80
- #define RTC_READ 0x40
- /*
- * Bits in the Seconds register
- */
- #define RTC_STOP 0x80
- /*
- * Bits in the Day register
- */
- #define RTC_BATT_FLAG 0x80
- #define RTC_FREQ_TEST 0x40
- /*
- * Conversion between binary and BCD.
- */
- #ifndef BCD_TO_BIN
- #define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
- #endif
- #ifndef BIN_TO_BCD
- #define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10)
- #endif
- #endif /* _DS1742RTC_H */