1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Machine dependent access functions for RTC registers.
7 *
8 * Copyright (C) 1996, 1997, 1998 Ralf Baechle
9 * Copyright (C) 2002  Maciej W. Rozycki
10 */
11#ifndef _ASM_MC146818RTC_H
12#define _ASM_MC146818RTC_H
13
14#include <linux/config.h>
15
16#include <asm/io.h>
17
18
19/*
20 * This structure defines how to access various features of
21 * different machine types and how to access them.
22 */
23struct rtc_ops {
24	/* How to access the RTC register in a DS1287.  */
25	unsigned char (*rtc_read_data)(unsigned long addr);
26	void (*rtc_write_data)(unsigned char data, unsigned long addr);
27	int (*rtc_bcd_mode)(void);
28};
29
30extern struct rtc_ops *rtc_ops;
31
32/*
33 * Most supported machines access the RTC index register via an ISA
34 * port access but the way to access the date register differs ...
35 * The DECstation directly maps the RTC memory in the CPU's address
36 * space with the chipset generating necessary index write/data access
37 * cycles automagically.
38 */
39#define CMOS_READ(addr) ({ \
40rtc_ops->rtc_read_data(addr); \
41})
42#define CMOS_WRITE(val, addr) ({ \
43rtc_ops->rtc_write_data(val, addr); \
44})
45#define RTC_ALWAYS_BCD \
46rtc_ops->rtc_bcd_mode()
47
48
49#ifdef CONFIG_DECSTATION
50
51#include <asm/dec/rtc-dec.h>
52
53#else
54
55#define RTC_PORT(x)	(0x70 + (x))
56#define RTC_IRQ		8
57
58#endif
59
60#endif /* _ASM_MC146818RTC_H */
61