85 lines
2.8 KiB
C
Executable file
85 lines
2.8 KiB
C
Executable file
/*
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ibm/cmos.h
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Created: Dec 1998 by Philip Homburg <philip@cs.vu.nl>
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Definitions for the CMOS/realtime clock. Based on the datasheet for the
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Dallas DS12887, compatible with the Motorola MC146818
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*/
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#define RTC_INDEX 0x70 /* Bit 7 = NMI enable (1) / disable (0)
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* bits 0..6 index
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*/
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#define RTC_IO 0x71 /* Data register,
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* Note: the operation following a write to
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* RTC_INDEX should an access (read or write)
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* to RTC_IO
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*/
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#define RTC_SEC 0x0 /* Seconds register */
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#define RTC_SEC_ALRM 0x1 /* Seconds register for alarm */
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#define RTC_MIN 0x2 /* Minutes register */
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#define RTC_MIN_ALRM 0x3 /* Minutes register for alarm */
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#define RTC_HOUR 0x4 /* Hours register */
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#define RTC_HOUR_ALRM 0x5 /* Hours register for alarm */
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#define RTC_WDAY 0x6 /* Day of the week, 1..7, Sunday = 1 */
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#define RTC_MDAY 0x7 /* Day of the month, 1..31 */
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#define RTC_MONTH 0x8 /* Month, 1..12 */
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#define RTC_YEAR 0x9 /* Year, 0..99 */
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#define RTC_REG_A 0xA
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#define RTC_A_UIP 0x80 /* Update in progress. When clear,
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* no update will occur for 244
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* micro seconds.
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*/
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#define RTC_A_DV 0x70 /* Divider bits, valid values are: */
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#define RTC_A_DV_OK 0x20 /* Normal */
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#define RTC_A_DV_STOP 0x70 /* Stop, a re-start starts
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* halfway through a cycle,
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* i.e. the update occurs after
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* 500ms.
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*/
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#define RTC_A_RS 0x0F /* Int. freq */
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/* 0 None
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* 1 256 Hz
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* 2 128 Hz
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* 3 8192 Hz
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* 4 4096 Hz
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* 5 2048 Hz
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* 6 1024 Hz
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* 7 512 Hz
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* 8 256 Hz
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* 9 128 Hz
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* 10 64 Hz
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* 11 32 Hz
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* 12 16 Hz
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* 13 8 Hz
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* 14 4 Hz
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* 15 2 Hz
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*/
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#define RTC_A_RS_DEF 6 /* Default freq. */
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#define RTC_REG_B 0xB
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#define RTC_B_SET 0x80 /* Inhibit updates */
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#define RTC_B_PIE 0x40 /* Enable periodic interrupts */
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#define RTC_B_AIE 0x20 /* Enable alarm interrupts */
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#define RTC_B_UIE 0x10 /* Enable update ended interrupts */
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#define RTC_B_SQWE 0x08 /* Enable square wave output */
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#define RTC_B_DM_BCD 0x04 /* Data is in BCD (otherwise binary) */
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#define RTC_B_24 0x02 /* Count hours in 24-hour mode */
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#define RTC_B_DSE 0x01 /* Automatic (wrong) daylight savings
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* updates
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*/
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#define RTC_REG_C 0xC
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/* Contents of the general purpose CMOS RAM (source IBM reference manual) */
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#define CMOS_STATUS 0xE
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#define CS_LOST_POWER 0x80 /* Chip lost power */
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#define CS_BAD_CHKSUM 0x40 /* Checksum is incorrect */
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#define CS_BAD_CONFIG 0x20 /* Bad configuration info */
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#define CS_BAD_MEMSIZE 0x10 /* Wrong memory size of CMOS */
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#define CS_BAD_HD 0x08 /* Harddisk failed */
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#define CS_BAD_TIME 0x04 /* CMOS time is invalid */
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/* bits 0 and 1 are reserved */
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/*
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* $PchId: cmos.h,v 1.1 1998/12/16 09:14:21 philip Exp $
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*/
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