1/*
2 * Machine dependent access functions for RTC registers.
3 */
4#ifndef _ASM_MC146818RTC_H
5#define _ASM_MC146818RTC_H
6
7#include <linux/config.h>
8#include <asm/atarihw.h>
9
10#ifdef CONFIG_ATARI
11/* RTC in Atari machines */
12
13#include <asm/atarihw.h>
14#include <asm/atariints.h>
15#include <asm/io.h>
16#define RTC_HAS_IRQ	(ATARIHW_PRESENT(TT_MFP))
17#define RTC_IRQ 	IRQ_TT_MFP_RTC
18#define RTC_IRQ_FLAGS	IRQ_TYPE_FAST
19#define RTC_PORT(x)	(TT_RTC_BAS + 2*(x))
20#define RTC_ALWAYS_BCD	0	/* TOS uses binary mode, Linux should be able
21				 * to deal with both modes */
22
23#define RTC_CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK))
24#define RTC_MACH_INIT()							\
25    do {								\
26	epoch = atari_rtc_year_offset + 1900;				\
27	if (RTC_HAS_IRQ)						\
28	    /* select RTC int on H->L edge */				\
29	    tt_mfp.active_edge &= ~0x40;				\
30    } while(0)
31#define RTC_MACH_EXIT()
32
33/* On Atari, the year was stored with base 1970 in old TOS versions (before
34 * 3.06). Later, Atari recognized that this broke leap year recognition, and
35 * changed the base to 1968. Medusa and Hades always use the new version. */
36#define RTC_CENTURY_SWITCH	-1	/* no century switch */
37#define RTC_MINYEAR		epoch
38
39#define CMOS_READ(addr) ({ \
40atari_outb_p((addr),RTC_PORT(0)); \
41atari_inb_p(RTC_PORT(1)); \
42})
43#define CMOS_WRITE(val, addr) ({ \
44atari_outb_p((addr),RTC_PORT(0)); \
45atari_outb_p((val),RTC_PORT(1)); \
46})
47#endif /* CONFIG_ATARI */
48
49#endif /* _ASM_MC146818RTC_H */
50