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mc146818rtc.h
/* mc146818rtc.h - register definitions for the Real-Time-Clock / CMOS RAM * Copyright Torsten Duwe <duwe@informatik.uni-erlangen.de> 1993 * derived from Data Sheet, Copyright Motorola 1984 (!). * It was written to be part of the Linux operating system. */ /* permission is hereby granted to copy, modify and redistribute this code * in terms of the GNU Library General Public License, Version 2 or later, * at your option. */ #ifndef _MC146818RTC_H #define _MC146818RTC_H #include <asm/io.h> #include <linux/rtc.h> /* get the user-level API */ #include <asm/mc146818rtc.h> /* register access macros */ #include <linux/bcd.h> #include <linux/delay.h> #include <linux/pm-trace.h> #ifdef __KERNEL__ #include <linux/spinlock.h> /* spinlock_t */ extern spinlock_t rtc_lock; /* serialize CMOS RAM access */ /* Some RTCs extend the mc146818 register set to support alarms of more * than 24 hours in the future; or dates that include a century code. * This platform_data structure can pass this information to the driver. * * Also, some platforms need suspend()/resume() hooks to kick in special * handling of wake alarms, e.g. activating ACPI BIOS hooks or setting up * a separate wakeup alarm used by some almost-clone chips. */ struct cmos_rtc_board_info { void (*wake_on)(struct device *dev); void (*wake_off)(struct device *dev); u32 flags; #define CMOS_RTC_FLAGS_NOFREQ (1 << 0) int address_space; u8 rtc_day_alarm; /* zero, or register index */ u8 rtc_mon_alarm; /* zero, or register index */ u8 rtc_century; /* zero, or register index */ }; #endif /********************************************************************** * register summary **********************************************************************/ #define RTC_SECONDS 0 #define RTC_SECONDS_ALARM 1 #define RTC_MINUTES 2 #define RTC_MINUTES_ALARM 3 #define RTC_HOURS 4 #define RTC_HOURS_ALARM 5 /* RTC_*_alarm is always true if 2 MSBs are set */ # define RTC_ALARM_DONT_CARE 0xC0 #define RTC_DAY_OF_WEEK 6 #define RTC_DAY_OF_MONTH 7 #define RTC_MONTH 8 #define RTC_YEAR 9 /* control registers - Moto names */ #define RTC_REG_A 10 #define RTC_REG_B 11 #define RTC_REG_C 12 #define RTC_REG_D 13 /********************************************************************** * register details **********************************************************************/ #define RTC_FREQ_SELECT RTC_REG_A /* update-in-progress - set to "1" 244 microsecs before RTC goes off the bus, * reset after update (may take 1.984ms @ 32768Hz RefClock) is complete, * totalling to a max high interval of 2.228 ms. */ # define RTC_UIP 0x80 # define RTC_DIV_CTL 0x70 /* divider control: refclock values 4.194 / 1.049 MHz / 32.768 kHz */ # define RTC_REF_CLCK_4MHZ 0x00 # define RTC_REF_CLCK_1MHZ 0x10 # define RTC_REF_CLCK_32KHZ 0x20 /* 2 values for divider stage reset, others for "testing purposes only" */ # define RTC_DIV_RESET1 0x60 # define RTC_DIV_RESET2 0x70 /* In AMD BKDG bit 5 and 6 are reserved, bit 4 is for select dv0 bank */ # define RTC_AMD_BANK_SELECT 0x10 /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */ # define RTC_RATE_SELECT 0x0F /**********************************************************************/ #define RTC_CONTROL RTC_REG_B # define RTC_SET 0x80 /* disable updates for clock setting */ # define RTC_PIE 0x40 /* periodic interrupt enable */ # define RTC_AIE 0x20 /* alarm interrupt enable */ # define RTC_UIE 0x10 /* update-finished interrupt enable */ # define RTC_SQWE 0x08 /* enable square-wave output */ # define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */ # define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */ # define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */ /**********************************************************************/ #define RTC_INTR_FLAGS RTC_REG_C /* caution - cleared by read */ # define RTC_IRQF 0x80 /* any of the following 3 is active */ # define RTC_PF 0x40 # define RTC_AF 0x20 # define RTC_UF 0x10 /**********************************************************************/ #define RTC_VALID RTC_REG_D # define RTC_VRT 0x80 /* valid RAM and time */ /**********************************************************************/ #ifndef ARCH_RTC_LOCATION /* Override by <asm/mc146818rtc.h>? */ #define RTC_IO_EXTENT 0x8 #define RTC_IO_EXTENT_USED 0x2 #define RTC_IOMAPPED 1 /* Default to I/O mapping. */ #else #define RTC_IO_EXTENT_USED RTC_IO_EXTENT #endif /* ARCH_RTC_LOCATION */ bool mc146818_does_rtc_work(void); int mc146818_get_time(struct rtc_time *time, int timeout); int mc146818_set_time(struct rtc_time *time); bool mc146818_avoid_UIP(void (*callback)(unsigned char seconds, void *param), int timeout, void *param); #endif /* _MC146818RTC_H */
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