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/*

 *  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.OARcorp.com/rtems/license.html.

 *

 *  $Id: icm7170.c,v 1.2 2001-09-27 12:01:42 chris Exp $

 */

#include <rtems.h>

#include <libchip/rtc.h>

#include <libchip/icm7170.h>

/*

 *  Control register bits

 */

/* XXX */

/*

 *  icm7170_initialize

 */

void icm7170_initialize(

  int minor

)

{

  unsigned32     icm7170;

  setRegister_f  setReg;

  unsigned32     clock;

  icm7170 = RTC_Table[ minor ].ulCtrlPort1;

  setReg = RTC_Table[ minor ].setRegister;

  /*

   *  Initialize the RTC with the proper clock frequency

   */

  clock = (unsigned32) RTC_Table[ minor ].pDeviceParams;

  (*setReg)( icm7170, ICM7170_CONTROL, 0x0c | clock );

}

/*

 *  icm7170_get_time

 */

int icm7170_get_time(

  int                minor,

  rtems_time_of_day *time

)

{

  unsigned32     icm7170;

  getRegister_f  getReg;

  setRegister_f  setReg;

  unsigned32     year;

  icm7170 = RTC_Table[ minor ].ulCtrlPort1;

  getReg = RTC_Table[ minor ].getRegister;

  setReg = RTC_Table[ minor ].setRegister;

  /*

   *  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

 */

int icm7170_set_time(

  int                minor,

  rtems_time_of_day *time

)

{

  unsigned32     icm7170;

  getRegister_f  getReg;

  setRegister_f  setReg;

  unsigned32     year;

  unsigned32     clock;

  icm7170 = RTC_Table[ minor ].ulCtrlPort1;

  getReg = RTC_Table[ minor ].getRegister;

  setReg = RTC_Table[ minor ].setRegister;

  clock = (unsigned32) 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

};