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Linux/include/linux/mc146818rtc.h

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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 
 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  */
 30 struct cmos_rtc_board_info {
 31         void    (*wake_on)(struct device *dev);
 32         void    (*wake_off)(struct device *dev);
 33 
 34         u8      rtc_day_alarm;          /* zero, or register index */
 35         u8      rtc_mon_alarm;          /* zero, or register index */
 36         u8      rtc_century;            /* zero, or register index */
 37 };
 38 #endif
 39 
 40 /**********************************************************************
 41  * register summary
 42  **********************************************************************/
 43 #define RTC_SECONDS             0
 44 #define RTC_SECONDS_ALARM       1
 45 #define RTC_MINUTES             2
 46 #define RTC_MINUTES_ALARM       3
 47 #define RTC_HOURS               4
 48 #define RTC_HOURS_ALARM         5
 49 /* RTC_*_alarm is always true if 2 MSBs are set */
 50 # define RTC_ALARM_DONT_CARE    0xC0
 51 
 52 #define RTC_DAY_OF_WEEK         6
 53 #define RTC_DAY_OF_MONTH        7
 54 #define RTC_MONTH               8
 55 #define RTC_YEAR                9
 56 
 57 /* control registers - Moto names
 58  */
 59 #define RTC_REG_A               10
 60 #define RTC_REG_B               11
 61 #define RTC_REG_C               12
 62 #define RTC_REG_D               13
 63 
 64 /**********************************************************************
 65  * register details
 66  **********************************************************************/
 67 #define RTC_FREQ_SELECT RTC_REG_A
 68 
 69 /* update-in-progress  - set to "1" 244 microsecs before RTC goes off the bus,
 70  * reset after update (may take 1.984ms @ 32768Hz RefClock) is complete,
 71  * totalling to a max high interval of 2.228 ms.
 72  */
 73 # define RTC_UIP                0x80
 74 # define RTC_DIV_CTL            0x70
 75    /* divider control: refclock values 4.194 / 1.049 MHz / 32.768 kHz */
 76 #  define RTC_REF_CLCK_4MHZ     0x00
 77 #  define RTC_REF_CLCK_1MHZ     0x10
 78 #  define RTC_REF_CLCK_32KHZ    0x20
 79    /* 2 values for divider stage reset, others for "testing purposes only" */
 80 #  define RTC_DIV_RESET1        0x60
 81 #  define RTC_DIV_RESET2        0x70
 82   /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */
 83 # define RTC_RATE_SELECT        0x0F
 84 
 85 /**********************************************************************/
 86 #define RTC_CONTROL     RTC_REG_B
 87 # define RTC_SET 0x80           /* disable updates for clock setting */
 88 # define RTC_PIE 0x40           /* periodic interrupt enable */
 89 # define RTC_AIE 0x20           /* alarm interrupt enable */
 90 # define RTC_UIE 0x10           /* update-finished interrupt enable */
 91 # define RTC_SQWE 0x08          /* enable square-wave output */
 92 # define RTC_DM_BINARY 0x04     /* all time/date values are BCD if clear */
 93 # define RTC_24H 0x02           /* 24 hour mode - else hours bit 7 means pm */
 94 # define RTC_DST_EN 0x01        /* auto switch DST - works f. USA only */
 95 
 96 /**********************************************************************/
 97 #define RTC_INTR_FLAGS  RTC_REG_C
 98 /* caution - cleared by read */
 99 # define RTC_IRQF 0x80          /* any of the following 3 is active */
100 # define RTC_PF 0x40
101 # define RTC_AF 0x20
102 # define RTC_UF 0x10
103 
104 /**********************************************************************/
105 #define RTC_VALID       RTC_REG_D
106 # define RTC_VRT 0x80           /* valid RAM and time */
107 /**********************************************************************/
108 
109 #ifndef ARCH_RTC_LOCATION       /* Override by <asm/mc146818rtc.h>? */
110 
111 #define RTC_IO_EXTENT   0x8
112 #define RTC_IO_EXTENT_USED      0x2
113 #define RTC_IOMAPPED    1       /* Default to I/O mapping. */
114 
115 #else
116 #define RTC_IO_EXTENT_USED      RTC_IO_EXTENT
117 #endif /* ARCH_RTC_LOCATION */
118 
119 #endif /* _MC146818RTC_H */
120 

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