1/* mc146818rtc.h - register definitions for the Real-Time-Clock / CMOS RAM
2 * Copyright Torsten Duwe <duwe@informatik.uni-erlangen.de> 1993
3 * derived from Data Sheet, Copyright Motorola 1984 (!).
4 * It was written to be part of the Linux operating system.
5 */
6/* permission is hereby granted to copy, modify and redistribute this code
7 * in terms of the GNU Library General Public License, Version 2 or later,
8 * at your option.
9 */
10
11#ifndef _MC146818RTC_H
12#define _MC146818RTC_H
13
14#include <asm/io.h>
15#include <linux/rtc.h>			/* get the user-level API */
16#include <asm/mc146818rtc.h>		/* register access macros */
17
18#ifdef __KERNEL__
19#include <linux/spinlock.h>		/* spinlock_t */
20extern spinlock_t rtc_lock;		/* serialize CMOS RAM access */
21
22/* Some RTCs extend the mc146818 register set to support alarms of more
23 * than 24 hours in the future; or dates that include a century code.
24 * This platform_data structure can pass this information to the driver.
25 *
26 * Also, some platforms need suspend()/resume() hooks to kick in special
27 * handling of wake alarms, e.g. activating ACPI BIOS hooks or setting up
28 * a separate wakeup alarm used by some almost-clone chips.
29 */
30struct cmos_rtc_board_info {
31	void	(*wake_on)(struct device *dev);
32	void	(*wake_off)(struct device *dev);
33
34	u8	rtc_day_alarm;		/* zero, or register index */
35	u8	rtc_mon_alarm;		/* zero, or register index */
36	u8	rtc_century;		/* zero, or register index */
37};
38#endif
39
40/**********************************************************************
41 * register summary
42 **********************************************************************/
43#define RTC_SECONDS		0
44#define RTC_SECONDS_ALARM	1
45#define RTC_MINUTES		2
46#define RTC_MINUTES_ALARM	3
47#define RTC_HOURS		4
48#define RTC_HOURS_ALARM		5
49/* RTC_*_alarm is always true if 2 MSBs are set */
50# define RTC_ALARM_DONT_CARE 	0xC0
51
52#define RTC_DAY_OF_WEEK		6
53#define RTC_DAY_OF_MONTH	7
54#define RTC_MONTH		8
55#define RTC_YEAR		9
56
57/* control registers - Moto names
58 */
59#define RTC_REG_A		10
60#define RTC_REG_B		11
61#define RTC_REG_C		12
62#define RTC_REG_D		13
63
64/**********************************************************************
65 * register details
66 **********************************************************************/
67#define RTC_FREQ_SELECT	RTC_REG_A
68
69/* update-in-progress  - set to "1" 244 microsecs before RTC goes off the bus,
70 * reset after update (may take 1.984ms @ 32768Hz RefClock) is complete,
71 * totalling to a max high interval of 2.228 ms.
72 */
73# define RTC_UIP		0x80
74# define RTC_DIV_CTL		0x70
75   /* divider control: refclock values 4.194 / 1.049 MHz / 32.768 kHz */
76#  define RTC_REF_CLCK_4MHZ	0x00
77#  define RTC_REF_CLCK_1MHZ	0x10
78#  define RTC_REF_CLCK_32KHZ	0x20
79   /* 2 values for divider stage reset, others for "testing purposes only" */
80#  define RTC_DIV_RESET1	0x60
81#  define RTC_DIV_RESET2	0x70
82  /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */
83# define RTC_RATE_SELECT 	0x0F
84
85/**********************************************************************/
86#define RTC_CONTROL	RTC_REG_B
87# define RTC_SET 0x80		/* disable updates for clock setting */
88# define RTC_PIE 0x40		/* periodic interrupt enable */
89# define RTC_AIE 0x20		/* alarm interrupt enable */
90# define RTC_UIE 0x10		/* update-finished interrupt enable */
91# define RTC_SQWE 0x08		/* enable square-wave output */
92# define RTC_DM_BINARY 0x04	/* all time/date values are BCD if clear */
93# define RTC_24H 0x02		/* 24 hour mode - else hours bit 7 means pm */
94# define RTC_DST_EN 0x01	/* auto switch DST - works f. USA only */
95
96/**********************************************************************/
97#define RTC_INTR_FLAGS	RTC_REG_C
98/* caution - cleared by read */
99# define RTC_IRQF 0x80		/* any of the following 3 is active */
100# define RTC_PF 0x40
101# define RTC_AF 0x20
102# define RTC_UF 0x10
103
104/**********************************************************************/
105#define RTC_VALID	RTC_REG_D
106# define RTC_VRT 0x80		/* valid RAM and time */
107/**********************************************************************/
108
109#ifndef ARCH_RTC_LOCATION	    /* Override by <asm/mc146818rtc.h>? */
110
111#define RTC_IO_EXTENT	0x8
112#define RTC_IOMAPPED	1	/* Default to I/O mapping. */
113
114#endif /* ARCH_RTC_LOCATION */
115
116#endif /* _MC146818RTC_H */
117