include/arch/i386/cmos.h

   1 /*
   2 ibm/cmos.h
   3
   4 Created:        Dec 1998 by Philip Homburg <philip@cs.vu.nl>
   5
   6 Definitions for the CMOS/realtime clock. Based on the datasheet for the
   7 Dallas DS12887, compatible with the Motorola MC146818
   8 */
   9
  10 #define RTC_INDEX       0x70    /* Bit 7 = NMI enable (1) / disable (0)
  11                                  * bits 0..6 index
  12                                  */
  13 #define RTC_IO          0x71    /* Data register,
  14                                  * Note: the operation following a write to
  15                                  * RTC_INDEX should an access (read or write)
  16                                  * to RTC_IO
  17                                  */
  18
  19 #define RTC_SEC         0x0     /* Seconds register */
  20 #define RTC_SEC_ALRM    0x1     /* Seconds register for alarm */
  21 #define RTC_MIN         0x2     /* Minutes register */
  22 #define RTC_MIN_ALRM    0x3     /* Minutes register for alarm */
  23 #define RTC_HOUR        0x4     /* Hours register */
  24 #define RTC_HOUR_ALRM   0x5     /* Hours register for alarm */
  25 #define RTC_WDAY        0x6     /* Day of the week, 1..7, Sunday = 1 */
  26 #define RTC_MDAY        0x7     /* Day of the month, 1..31 */
  27 #define RTC_MONTH       0x8     /* Month, 1..12 */
  28 #define RTC_YEAR        0x9     /* Year, 0..99 */
  29 #define RTC_REG_A       0xA
  30 #define         RTC_A_UIP       0x80    /* Update in progress. When clear,
  31                                          * no update will occur for 244
  32                                          * micro seconds.
  33                                          */
  34 #define         RTC_A_DV        0x70    /* Divider bits, valid values are: */
  35 #define             RTC_A_DV_OK     0x20        /* Normal */
  36 #define             RTC_A_DV_STOP   0x70        /* Stop, a re-start starts
  37                                                  * halfway through a cycle,
  38                                                  * i.e. the update occurs after
  39                                                  * 500ms.
  40                                                  */
  41 #define         RTC_A_RS        0x0F    /* Int. freq */
  42                                     /*  0       None
  43                                      *  1        256 Hz
  44                                      *  2        128 Hz
  45                                      *  3       8192 Hz
  46                                      *  4       4096 Hz
  47                                      *  5       2048 Hz
  48                                      *  6       1024 Hz
  49                                      *  7        512 Hz
  50                                      *  8        256 Hz
  51                                      *  9        128 Hz
  52                                      * 10         64 Hz
  53                                      * 11         32 Hz
  54                                      * 12         16 Hz
  55                                      * 13          8 Hz
  56                                      * 14          4 Hz
  57                                      * 15          2 Hz
  58                                      */
  59 #define             RTC_A_RS_DEF    6   /* Default freq. */
  60 #define RTC_REG_B       0xB
  61 #define         RTC_B_SET       0x80    /* Inhibit updates */
  62 #define         RTC_B_PIE       0x40    /* Enable periodic interrupts */
  63 #define         RTC_B_AIE       0x20    /* Enable alarm interrupts */
  64 #define         RTC_B_UIE       0x10    /* Enable update ended interrupts */
  65 #define         RTC_B_SQWE      0x08    /* Enable square wave output */
  66 #define         RTC_B_DM_BCD    0x04    /* Data is in BCD (otherwise binary) */
  67 #define         RTC_B_24        0x02    /* Count hours in 24-hour mode */
  68 #define         RTC_B_DSE       0x01    /* Automatic (wrong) daylight savings
  69                                          * updates
  70                                          */
  71 #define RTC_REG_C       0xC
  72
  73 /* Contents of the general purpose CMOS RAM (source IBM reference manual) */
  74 #define CMOS_STATUS     0xE
  75 #define         CS_LOST_POWER   0x80    /* Chip lost power */
  76 #define         CS_BAD_CHKSUM   0x40    /* Checksum is incorrect */
  77 #define         CS_BAD_CONFIG   0x20    /* Bad configuration info */
  78 #define         CS_BAD_MEMSIZE  0x10    /* Wrong memory size of CMOS */
  79 #define         CS_BAD_HD       0x08    /* Harddisk failed */
  80 #define         CS_BAD_TIME     0x04    /* CMOS time is invalid */
  81                                         /* bits 0 and 1 are reserved */
  82
  83 /*
  84  * $PchId: cmos.h,v 1.1 1998/12/16 09:14:21 philip Exp $
  85  */