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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 */ | |
20 | extern spinlock_t rtc_lock; /* serialize CMOS RAM access */ | |
21 | #endif | |
22 | ||
23 | /********************************************************************** | |
24 | * register summary | |
25 | **********************************************************************/ | |
26 | #define RTC_SECONDS 0 | |
27 | #define RTC_SECONDS_ALARM 1 | |
28 | #define RTC_MINUTES 2 | |
29 | #define RTC_MINUTES_ALARM 3 | |
30 | #define RTC_HOURS 4 | |
31 | #define RTC_HOURS_ALARM 5 | |
32 | /* RTC_*_alarm is always true if 2 MSBs are set */ | |
33 | # define RTC_ALARM_DONT_CARE 0xC0 | |
34 | ||
35 | #define RTC_DAY_OF_WEEK 6 | |
36 | #define RTC_DAY_OF_MONTH 7 | |
37 | #define RTC_MONTH 8 | |
38 | #define RTC_YEAR 9 | |
39 | ||
40 | /* control registers - Moto names | |
41 | */ | |
42 | #define RTC_REG_A 10 | |
43 | #define RTC_REG_B 11 | |
44 | #define RTC_REG_C 12 | |
45 | #define RTC_REG_D 13 | |
46 | ||
47 | /********************************************************************** | |
48 | * register details | |
49 | **********************************************************************/ | |
50 | #define RTC_FREQ_SELECT RTC_REG_A | |
51 | ||
52 | /* update-in-progress - set to "1" 244 microsecs before RTC goes off the bus, | |
53 | * reset after update (may take 1.984ms @ 32768Hz RefClock) is complete, | |
54 | * totalling to a max high interval of 2.228 ms. | |
55 | */ | |
56 | # define RTC_UIP 0x80 | |
57 | # define RTC_DIV_CTL 0x70 | |
58 | /* divider control: refclock values 4.194 / 1.049 MHz / 32.768 kHz */ | |
59 | # define RTC_REF_CLCK_4MHZ 0x00 | |
60 | # define RTC_REF_CLCK_1MHZ 0x10 | |
61 | # define RTC_REF_CLCK_32KHZ 0x20 | |
62 | /* 2 values for divider stage reset, others for "testing purposes only" */ | |
63 | # define RTC_DIV_RESET1 0x60 | |
64 | # define RTC_DIV_RESET2 0x70 | |
65 | /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */ | |
66 | # define RTC_RATE_SELECT 0x0F | |
67 | ||
68 | /**********************************************************************/ | |
69 | #define RTC_CONTROL RTC_REG_B | |
70 | # define RTC_SET 0x80 /* disable updates for clock setting */ | |
71 | # define RTC_PIE 0x40 /* periodic interrupt enable */ | |
72 | # define RTC_AIE 0x20 /* alarm interrupt enable */ | |
73 | # define RTC_UIE 0x10 /* update-finished interrupt enable */ | |
74 | # define RTC_SQWE 0x08 /* enable square-wave output */ | |
75 | # define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */ | |
76 | # define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */ | |
77 | # define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */ | |
78 | ||
79 | /**********************************************************************/ | |
80 | #define RTC_INTR_FLAGS RTC_REG_C | |
81 | /* caution - cleared by read */ | |
82 | # define RTC_IRQF 0x80 /* any of the following 3 is active */ | |
83 | # define RTC_PF 0x40 | |
84 | # define RTC_AF 0x20 | |
85 | # define RTC_UF 0x10 | |
86 | ||
87 | /**********************************************************************/ | |
88 | #define RTC_VALID RTC_REG_D | |
89 | # define RTC_VRT 0x80 /* valid RAM and time */ | |
90 | /**********************************************************************/ | |
91 | ||
92 | #endif /* _MC146818RTC_H */ |