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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* mc146818rtc.h - register definitions for the Real-Time-Clock / CMOS RAM |
| 2 | * Copyright Torsten Duwe <duwe@informatik.uni-erlangen.de> 1993 |
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| 3 | * derived from Data Sheet, Copyright Motorola 1984 (!). |
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| 4 | * It was written to be part of the Linux operating system. |
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| 5 | */ |
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| 6 | /* permission is hereby granted to copy, modify and redistribute this code |
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| 7 | * in terms of the GNU Library General Public License, Version 2 or later, |
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| 8 | * at your option. |
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| 9 | */ |
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| 10 | |||
| 11 | #ifndef _MC146818RTC_H |
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| 12 | #define _MC146818RTC_H |
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| 13 | |||
| 14 | #include <asm/io.h> |
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| 15 | #include <linux/rtc.h> /* get the user-level API */ |
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| 16 | #include <linux/spinlock.h> /* spinlock_t */ |
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| 17 | #include <asm/mc146818rtc.h> /* register access macros */ |
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| 18 | |||
| 19 | extern spinlock_t rtc_lock; /* serialize CMOS RAM access */ |
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| 20 | |||
| 21 | /********************************************************************** |
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| 22 | * register summary |
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| 23 | **********************************************************************/ |
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| 24 | #define RTC_SECONDS 0 |
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| 25 | #define RTC_SECONDS_ALARM 1 |
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| 26 | #define RTC_MINUTES 2 |
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| 27 | #define RTC_MINUTES_ALARM 3 |
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| 28 | #define RTC_HOURS 4 |
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| 29 | #define RTC_HOURS_ALARM 5 |
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| 30 | /* RTC_*_alarm is always true if 2 MSBs are set */ |
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| 31 | # define RTC_ALARM_DONT_CARE 0xC0 |
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| 32 | |||
| 33 | #define RTC_DAY_OF_WEEK 6 |
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| 34 | #define RTC_DAY_OF_MONTH 7 |
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| 35 | #define RTC_MONTH 8 |
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| 36 | #define RTC_YEAR 9 |
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| 37 | |||
| 38 | /* control registers - Moto names |
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| 39 | */ |
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| 40 | #define RTC_REG_A 10 |
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| 41 | #define RTC_REG_B 11 |
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| 42 | #define RTC_REG_C 12 |
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| 43 | #define RTC_REG_D 13 |
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| 44 | |||
| 45 | /********************************************************************** |
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| 46 | * register details |
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| 47 | **********************************************************************/ |
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| 48 | #define RTC_FREQ_SELECT RTC_REG_A |
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| 49 | |||
| 50 | /* update-in-progress - set to "1" 244 microsecs before RTC goes off the bus, |
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| 51 | * reset after update (may take 1.984ms @ 32768Hz RefClock) is complete, |
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| 52 | * totalling to a max high interval of 2.228 ms. |
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| 53 | */ |
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| 54 | # define RTC_UIP 0x80 |
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| 55 | # define RTC_DIV_CTL 0x70 |
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| 56 | /* divider control: refclock values 4.194 / 1.049 MHz / 32.768 kHz */ |
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| 57 | # define RTC_REF_CLCK_4MHZ 0x00 |
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| 58 | # define RTC_REF_CLCK_1MHZ 0x10 |
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| 59 | # define RTC_REF_CLCK_32KHZ 0x20 |
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| 60 | /* 2 values for divider stage reset, others for "testing purposes only" */ |
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| 61 | # define RTC_DIV_RESET1 0x60 |
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| 62 | # define RTC_DIV_RESET2 0x70 |
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| 63 | /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */ |
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| 64 | # define RTC_RATE_SELECT 0x0F |
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| 65 | |||
| 66 | /**********************************************************************/ |
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| 67 | #define RTC_CONTROL RTC_REG_B |
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| 68 | # define RTC_SET 0x80 /* disable updates for clock setting */ |
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| 69 | # define RTC_PIE 0x40 /* periodic interrupt enable */ |
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| 70 | # define RTC_AIE 0x20 /* alarm interrupt enable */ |
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| 71 | # define RTC_UIE 0x10 /* update-finished interrupt enable */ |
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| 72 | # define RTC_SQWE 0x08 /* enable square-wave output */ |
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| 73 | # define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */ |
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| 74 | # define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */ |
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| 75 | # define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */ |
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| 76 | |||
| 77 | /**********************************************************************/ |
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| 78 | #define RTC_INTR_FLAGS RTC_REG_C |
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| 79 | /* caution - cleared by read */ |
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| 80 | # define RTC_IRQF 0x80 /* any of the following 3 is active */ |
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| 81 | # define RTC_PF 0x40 |
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| 82 | # define RTC_AF 0x20 |
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| 83 | # define RTC_UF 0x10 |
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| 84 | |||
| 85 | /**********************************************************************/ |
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| 86 | #define RTC_VALID RTC_REG_D |
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| 87 | # define RTC_VRT 0x80 /* valid RAM and time */ |
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| 88 | /**********************************************************************/ |
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| 89 | |||
| 90 | #endif /* _MC146818RTC_H */ |