rtc-dec.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/*
 * 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.
 *
 * RTC routines for DECstation style attached Dallas DS1287 chip.
 *
 * Copyright (C) 1998, 2001 by Ralf Baechle
 * Copyright (C) 1998 by Harald Koerfgen
 * Copyright (C) 2002  Maciej W. Rozycki
 */

#include <linux/mc146818rtc.h>
#include <linux/types.h>

volatile u8 *dec_rtc_base;

static unsigned char dec_rtc_read_data(unsigned long addr)
{
	return dec_rtc_base[addr * 4];
}

static void dec_rtc_write_data(unsigned char data, unsigned long addr)
{
	dec_rtc_base[addr * 4] = data;
}

static int dec_rtc_bcd_mode(void)
{
	return 0;
}

struct rtc_ops dec_rtc_ops = {
	&dec_rtc_read_data,
	&dec_rtc_write_data,
	&dec_rtc_bcd_mode
};