mc146818rtc.h 3.9 KB

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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. #ifndef _MC146818RTC_H
  11. #define _MC146818RTC_H
  12. #include <asm/io.h>
  13. #include <linux/rtc.h> /* get the user-level API */
  14. #include <asm/mc146818rtc.h> /* register access macros */
  15. #ifdef __KERNEL__
  16. #include <linux/spinlock.h> /* spinlock_t */
  17. extern spinlock_t rtc_lock; /* serialize CMOS RAM access */
  18. /* Some RTCs extend the mc146818 register set to support alarms of more
  19. * than 24 hours in the future; or dates that include a century code.
  20. * This platform_data structure can pass this information to the driver.
  21. */
  22. struct cmos_rtc_board_info {
  23. u8 rtc_day_alarm; /* zero, or register index */
  24. u8 rtc_mon_alarm; /* zero, or register index */
  25. u8 rtc_century; /* zero, or register index */
  26. };
  27. #endif
  28. /**********************************************************************
  29. * register summary
  30. **********************************************************************/
  31. #define RTC_SECONDS 0
  32. #define RTC_SECONDS_ALARM 1
  33. #define RTC_MINUTES 2
  34. #define RTC_MINUTES_ALARM 3
  35. #define RTC_HOURS 4
  36. #define RTC_HOURS_ALARM 5
  37. /* RTC_*_alarm is always true if 2 MSBs are set */
  38. # define RTC_ALARM_DONT_CARE 0xC0
  39. #define RTC_DAY_OF_WEEK 6
  40. #define RTC_DAY_OF_MONTH 7
  41. #define RTC_MONTH 8
  42. #define RTC_YEAR 9
  43. /* control registers - Moto names
  44. */
  45. #define RTC_REG_A 10
  46. #define RTC_REG_B 11
  47. #define RTC_REG_C 12
  48. #define RTC_REG_D 13
  49. /**********************************************************************
  50. * register details
  51. **********************************************************************/
  52. #define RTC_FREQ_SELECT RTC_REG_A
  53. /* update-in-progress - set to "1" 244 microsecs before RTC goes off the bus,
  54. * reset after update (may take 1.984ms @ 32768Hz RefClock) is complete,
  55. * totalling to a max high interval of 2.228 ms.
  56. */
  57. # define RTC_UIP 0x80
  58. # define RTC_DIV_CTL 0x70
  59. /* divider control: refclock values 4.194 / 1.049 MHz / 32.768 kHz */
  60. # define RTC_REF_CLCK_4MHZ 0x00
  61. # define RTC_REF_CLCK_1MHZ 0x10
  62. # define RTC_REF_CLCK_32KHZ 0x20
  63. /* 2 values for divider stage reset, others for "testing purposes only" */
  64. # define RTC_DIV_RESET1 0x60
  65. # define RTC_DIV_RESET2 0x70
  66. /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */
  67. # define RTC_RATE_SELECT 0x0F
  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. #define RTC_INTR_FLAGS RTC_REG_C
  80. /* caution - cleared by read */
  81. # define RTC_IRQF 0x80 /* any of the following 3 is active */
  82. # define RTC_PF 0x40
  83. # define RTC_AF 0x20
  84. # define RTC_UF 0x10
  85. /**********************************************************************/
  86. #define RTC_VALID RTC_REG_D
  87. # define RTC_VRT 0x80 /* valid RAM and time */
  88. /**********************************************************************/
  89. #ifndef ARCH_RTC_LOCATION /* Override by <asm/mc146818rtc.h>? */
  90. #define RTC_IO_EXTENT 0x8
  91. #define RTC_IOMAPPED 1 /* Default to I/O mapping. */
  92. #endif /* ARCH_RTC_LOCATION */
  93. #endif /* _MC146818RTC_H */