/*
* This file interfaces with the real-time clock found in
* a Harris ICM7170
*
* Year 2K Notes:
*
* This chip only uses a two digit field to store the year. This
* code uses the RTEMS Epoch as a pivot year. This lets us map the
* two digit year field as follows:
*
* + two digit years 0-87 are mapped to 2000-2087.
* + two digit years 88-99 are mapped to 1988-1999.
*
* This is less than the time span supported by RTEMS.
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <rtems.h>
#include <libchip/rtc.h>
#include <libchip/icm7170.h>
/*
* Control register bits
*/
/* XXX */
/*
* icm7170_initialize
*/
static void icm7170_initialize(
int minor
)
{
uintptr_t icm7170;
setRegister_f setReg;
uintptr_t clock;
icm7170 = RTC_Table[ minor ].ulCtrlPort1;
setReg = RTC_Table[ minor ].setRegister;
/*
* Initialize the RTC with the proper clock frequency
*/
clock = (uintptr_t) RTC_Table[ minor ].pDeviceParams;
(*setReg)( icm7170, ICM7170_CONTROL, 0x0c | clock );
}
/*
* icm7170_get_time
*/
static int icm7170_get_time(
int minor,
rtems_time_of_day *time
)
{
uint32_t icm7170;
getRegister_f getReg;
uint32_t year;
icm7170 = RTC_Table[ minor ].ulCtrlPort1;
getReg = RTC_Table[ minor ].getRegister;
/*
* Put the RTC into read mode
*/
(void) (*getReg)( icm7170, ICM7170_COUNTER_HUNDREDTHS );
/*
* Now get the time
*/
year = (*getReg)( icm7170, ICM7170_YEAR );
if ( year < 88 )
year += 2000;
else
year += 1900;
time->year = year;
time->month = (*getReg)( icm7170, ICM7170_MONTH );
time->day = (*getReg)( icm7170, ICM7170_DATE );
time->hour = (*getReg)( icm7170, ICM7170_HOUR );
time->minute = (*getReg)( icm7170, ICM7170_MINUTE );
time->second = (*getReg)( icm7170, ICM7170_SECOND );
time->ticks = 0;
/*
* Put the RTC back into normal mode.
*/
(void) (*getReg)( icm7170, ICM7170_COUNTER_HUNDREDTHS );
return 0;
}
/*
* icm7170_set_time
*/
static int icm7170_set_time(
int minor,
const rtems_time_of_day *time
)
{
uintptr_t icm7170;
setRegister_f setReg;
uint32_t year;
uintptr_t clock;
icm7170 = RTC_Table[ minor ].ulCtrlPort1;
setReg = RTC_Table[ minor ].setRegister;
clock = (uintptr_t) RTC_Table[ minor ].pDeviceParams;
year = time->year;
if ( year >= 2088 )
rtems_fatal_error_occurred( RTEMS_INVALID_NUMBER );
if ( year >= 2000 )
year -= 2000;
else
year -= 1900;
(*setReg)( icm7170, ICM7170_CONTROL, 0x04 | clock );
(*setReg)( icm7170, ICM7170_YEAR, year );
(*setReg)( icm7170, ICM7170_MONTH, time->month );
(*setReg)( icm7170, ICM7170_DATE, time->day );
(*setReg)( icm7170, ICM7170_HOUR, time->hour );
(*setReg)( icm7170, ICM7170_MINUTE, time->minute );
(*setReg)( icm7170, ICM7170_SECOND, time->second );
/*
* This is not really right.
*/
(*setReg)( icm7170, ICM7170_DAY_OF_WEEK, 1 );
/*
* Put the RTC back into normal mode.
*/
(*setReg)( icm7170, ICM7170_CONTROL, 0x0c | clock );
return 0;
}
/*
* Driver function table
*/
rtc_fns icm7170_fns = {
icm7170_initialize,
icm7170_get_time,
icm7170_set_time
};
