minix/include/ibm/cmos.h
2005-08-22 15:23:47 +00:00

85 lines
2.8 KiB
C
Executable file

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