1 /* mc146818rtc.h - register definitions for the Real-Time-Clock / CMOS RAM 2 * Copyright Torsten Duwe <[email protected]> 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 #include <linux/bcd.h> 18 #include <linux/delay.h> 19 20 #ifdef __KERNEL__ 21 #include <linux/spinlock.h> /* spinlock_t */ 22 extern spinlock_t rtc_lock; /* serialize CMOS RAM access */ 23 24 /* Some RTCs extend the mc146818 register set to support alarms of more 25 * than 24 hours in the future; or dates that include a century code. 26 * This platform_data structure can pass this information to the driver. 27 * 28 * Also, some platforms need suspend()/resume() hooks to kick in special 29 * handling of wake alarms, e.g. activating ACPI BIOS hooks or setting up 30 * a separate wakeup alarm used by some almost-clone chips. 31 */ 32 struct cmos_rtc_board_info { 33 void (*wake_on)(struct device *dev); 34 void (*wake_off)(struct device *dev); 35 36 u32 flags; 37 #define CMOS_RTC_FLAGS_NOFREQ (1 << 0) 38 int address_space; 39 40 u8 rtc_day_alarm; /* zero, or register index */ 41 u8 rtc_mon_alarm; /* zero, or register index */ 42 u8 rtc_century; /* zero, or register index */ 43 }; 44 #endif 45 46 /********************************************************************** 47 * register summary 48 **********************************************************************/ 49 #define RTC_SECONDS 0 50 #define RTC_SECONDS_ALARM 1 51 #define RTC_MINUTES 2 52 #define RTC_MINUTES_ALARM 3 53 #define RTC_HOURS 4 54 #define RTC_HOURS_ALARM 5 55 /* RTC_*_alarm is always true if 2 MSBs are set */ 56 # define RTC_ALARM_DONT_CARE 0xC0 57 58 #define RTC_DAY_OF_WEEK 6 59 #define RTC_DAY_OF_MONTH 7 60 #define RTC_MONTH 8 61 #define RTC_YEAR 9 62 63 /* control registers - Moto names 64 */ 65 #define RTC_REG_A 10 66 #define RTC_REG_B 11 67 #define RTC_REG_C 12 68 #define RTC_REG_D 13 69 70 /********************************************************************** 71 * register details 72 **********************************************************************/ 73 #define RTC_FREQ_SELECT RTC_REG_A 74 75 /* update-in-progress - set to "1" 244 microsecs before RTC goes off the bus, 76 * reset after update (may take 1.984ms @ 32768Hz RefClock) is complete, 77 * totalling to a max high interval of 2.228 ms. 78 */ 79 # define RTC_UIP 0x80 80 # define RTC_DIV_CTL 0x70 81 /* divider control: refclock values 4.194 / 1.049 MHz / 32.768 kHz */ 82 # define RTC_REF_CLCK_4MHZ 0x00 83 # define RTC_REF_CLCK_1MHZ 0x10 84 # define RTC_REF_CLCK_32KHZ 0x20 85 /* 2 values for divider stage reset, others for "testing purposes only" */ 86 # define RTC_DIV_RESET1 0x60 87 # define RTC_DIV_RESET2 0x70 88 /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */ 89 # define RTC_RATE_SELECT 0x0F 90 91 /**********************************************************************/ 92 #define RTC_CONTROL RTC_REG_B 93 # define RTC_SET 0x80 /* disable updates for clock setting */ 94 # define RTC_PIE 0x40 /* periodic interrupt enable */ 95 # define RTC_AIE 0x20 /* alarm interrupt enable */ 96 # define RTC_UIE 0x10 /* update-finished interrupt enable */ 97 # define RTC_SQWE 0x08 /* enable square-wave output */ 98 # define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */ 99 # define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */ 100 # define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */ 101 102 /**********************************************************************/ 103 #define RTC_INTR_FLAGS RTC_REG_C 104 /* caution - cleared by read */ 105 # define RTC_IRQF 0x80 /* any of the following 3 is active */ 106 # define RTC_PF 0x40 107 # define RTC_AF 0x20 108 # define RTC_UF 0x10 109 110 /**********************************************************************/ 111 #define RTC_VALID RTC_REG_D 112 # define RTC_VRT 0x80 /* valid RAM and time */ 113 /**********************************************************************/ 114 115 #ifndef ARCH_RTC_LOCATION /* Override by <asm/mc146818rtc.h>? */ 116 117 #define RTC_IO_EXTENT 0x8 118 #define RTC_IO_EXTENT_USED 0x2 119 #define RTC_IOMAPPED 1 /* Default to I/O mapping. */ 120 121 #else 122 #define RTC_IO_EXTENT_USED RTC_IO_EXTENT 123 #endif /* ARCH_RTC_LOCATION */ 124 125 unsigned int mc146818_get_time(struct rtc_time *time); 126 int mc146818_set_time(struct rtc_time *time); 127 128 #endif /* _MC146818RTC_H */ 129