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 u32 flags; 35#define CMOS_RTC_FLAGS_NOFREQ (1 << 0) 36 int address_space; 37 38 u8 rtc_day_alarm; /* zero, or register index */ 39 u8 rtc_mon_alarm; /* zero, or register index */ 40 u8 rtc_century; /* zero, or register index */ 41}; 42#endif 43 44/********************************************************************** 45 * register summary 46 **********************************************************************/ 47#define RTC_SECONDS 0 48#define RTC_SECONDS_ALARM 1 49#define RTC_MINUTES 2 50#define RTC_MINUTES_ALARM 3 51#define RTC_HOURS 4 52#define RTC_HOURS_ALARM 5 53/* RTC_*_alarm is always true if 2 MSBs are set */ 54# define RTC_ALARM_DONT_CARE 0xC0 55 56#define RTC_DAY_OF_WEEK 6 57#define RTC_DAY_OF_MONTH 7 58#define RTC_MONTH 8 59#define RTC_YEAR 9 60 61/* control registers - Moto names 62 */ 63#define RTC_REG_A 10 64#define RTC_REG_B 11 65#define RTC_REG_C 12 66#define RTC_REG_D 13 67 68/********************************************************************** 69 * register details 70 **********************************************************************/ 71#define RTC_FREQ_SELECT RTC_REG_A 72 73/* update-in-progress - set to "1" 244 microsecs before RTC goes off the bus, 74 * reset after update (may take 1.984ms @ 32768Hz RefClock) is complete, 75 * totalling to a max high interval of 2.228 ms. 76 */ 77# define RTC_UIP 0x80 78# define RTC_DIV_CTL 0x70 79 /* divider control: refclock values 4.194 / 1.049 MHz / 32.768 kHz */ 80# define RTC_REF_CLCK_4MHZ 0x00 81# define RTC_REF_CLCK_1MHZ 0x10 82# define RTC_REF_CLCK_32KHZ 0x20 83 /* 2 values for divider stage reset, others for "testing purposes only" */ 84# define RTC_DIV_RESET1 0x60 85# define RTC_DIV_RESET2 0x70 86 /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */ 87# define RTC_RATE_SELECT 0x0F 88 89/**********************************************************************/ 90#define RTC_CONTROL RTC_REG_B 91# define RTC_SET 0x80 /* disable updates for clock setting */ 92# define RTC_PIE 0x40 /* periodic interrupt enable */ 93# define RTC_AIE 0x20 /* alarm interrupt enable */ 94# define RTC_UIE 0x10 /* update-finished interrupt enable */ 95# define RTC_SQWE 0x08 /* enable square-wave output */ 96# define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */ 97# define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */ 98# define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */ 99 100/**********************************************************************/ 101#define RTC_INTR_FLAGS RTC_REG_C 102/* caution - cleared by read */ 103# define RTC_IRQF 0x80 /* any of the following 3 is active */ 104# define RTC_PF 0x40 105# define RTC_AF 0x20 106# define RTC_UF 0x10 107 108/**********************************************************************/ 109#define RTC_VALID RTC_REG_D 110# define RTC_VRT 0x80 /* valid RAM and time */ 111/**********************************************************************/ 112 113#ifndef ARCH_RTC_LOCATION /* Override by <asm/mc146818rtc.h>? */ 114 115#define RTC_IO_EXTENT 0x8 116#define RTC_IO_EXTENT_USED 0x2 117#define RTC_IOMAPPED 1 /* Default to I/O mapping. */ 118 119#else 120#define RTC_IO_EXTENT_USED RTC_IO_EXTENT 121#endif /* ARCH_RTC_LOCATION */ 122 123#endif /* _MC146818RTC_H */ 124