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/*
* Real Time Clock (Harris ICM7170) for RTEMS
*
* This part is found on the second generation of this board.
*
* 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.
*
* $Id$
*/
#include <rtems.h>
#include <tod.h>
#include <bsp.h>
/*
* These values are programed into a register and must not be changed.
*/
#define ICM1770_CRYSTAL_FREQ_32K 0x00
#define ICM1770_CRYSTAL_FREQ_1M 0x01
#define ICM1770_CRYSTAL_FREQ_2M 0x02
#define ICM1770_CRYSTAL_FREQ_4M 0x03
void ICM7170_GetTOD(
volatile unsigned char *imc1770_regs,
rtems_unsigned8 icm1770_freq,
rtems_time_of_day *rtc_tod
);
void ICM7170_SetTOD(
volatile unsigned char *imc1770_regs,
rtems_unsigned8 icm1770_freq,
rtems_time_of_day *rtc_tod
);
/*
* This code is dependent on the boards use of the ICM7170 RTC/NVRAM
* and should remain in this file.
*/
/* PAGE
*
* This routine copies the time from the real time clock to RTEMS
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: NONE
*/
void setRealTimeToRTEMS()
{
rtems_time_of_day rtc_tod;
ICM7170_GetTOD( DMV170_RTC_ADDRESS, DMV170_RTC_FREQUENCY, &rtc_tod );
rtems_clock_set( &rtc_tod );
}
/* PAGE
*
* setRealTimeFromRTEMS
*
* This routine copies the time from RTEMS to the real time clock
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: NONE
*/
void setRealTimeFromRTEMS()
{
rtems_time_of_day rtems_tod;
rtems_clock_get( RTEMS_CLOCK_GET_TOD, &rtems_tod );
ICM7170_SetTOD( DMV170_RTC_ADDRESS, DMV170_RTC_FREQUENCY, &rtems_tod );
}
/* PAGE
*
* checkRealTime
*
* This routine reads the returns the variance betweent the real time and
* rtems time.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
* int The differance between the real time clock and rtems time or
* 9999 in the event of an error.
*/
int checkRealTime()
{
rtems_time_of_day rtems_tod;
rtems_time_of_day rtc_tod;
ICM7170_GetTOD( DMV170_RTC_ADDRESS, DMV170_RTC_FREQUENCY, &rtc_tod );
rtems_clock_get( RTEMS_CLOCK_GET_TOD, &rtems_tod );
if( rtems_tod.year == rtc_tod.year &&
rtems_tod.month == rtc_tod.month &&
rtems_tod.day == rtc_tod.day ) {
return ((rtems_tod.hour - rtc_tod.hour) * 3600) +
((rtems_tod.minute - rtc_tod.minute) * 60) +
(rtems_tod.second - rtc_tod.second);
}
return 9999;
}
/*
* These routines are ICM7170 should be in
* a separate support library. When the chiplib
* is created for RTEMS these routines will be moved.
*/
/* PAGE
*
* ICM7170_GetField
*
* This routine gets a field
*
* Input parameters:
* imc1770_regs - pointer to the register base address.
* reg - register id
*
* Output parameters: NONE
*
* Return values: value of register
*/
static int ICM7170_GetField(
volatile unsigned char *imc1770_regs,
int reg
)
{
unsigned char x;
x = imc1770_regs[reg*4];
return x;
}
/* PAGE
*
* ICM7170_SetField
*
* This routine sets a field
*
* Input parameters:
* imc1770_regs - pointer to the register base address.
* reg - register id
* d - data to write
*
* Output parameters: NONE
*
* Return values: NONE
*/
static void ICM7170_SetField(
volatile unsigned char *imc1770_regs,
int reg,
unsigned char d
)
{
imc1770_regs[reg*4] = d;
}
/* PAGE
*
* ICM7170_GetTOD
*
* This routine gets the real time clock time of day in rtems
* time of day format.
*
* Input parameters:
* imc1770_regs - pointer to the register base address.
* icm1770_freq - oscillator frequency
*
* Output parameters:
* rtc_tod - time of day by the real time clock
*
* Return values: NONE
*/
void ICM7170_GetTOD(
volatile unsigned char *imc1770_regs,
rtems_unsigned8 icm1770_freq,
rtems_time_of_day *rtc_tod
)
{
int year;
int usec;
static rtems_boolean init = TRUE;
/* Initialize the clock at once prior to reading */
if (init ) {
ICM7170_SetField( imc1770_regs, 0x11, (0x0c | icm1770_freq) );
init = FALSE;
}
usec = ICM7170_GetField( imc1770_regs, 0x00 );
year = ICM7170_GetField( imc1770_regs, 0x06 );
if ( year >= 88 )
year += 1900;
else
year += 2000;
rtc_tod->year = year;
rtc_tod->month = ICM7170_GetField( imc1770_regs, 0x04 );
rtc_tod->day = ICM7170_GetField( imc1770_regs, 0x05 );
rtc_tod->hour = ICM7170_GetField( imc1770_regs, 0x01 );
rtc_tod->minute = ICM7170_GetField( imc1770_regs, 0x02 );
rtc_tod->second = ICM7170_GetField( imc1770_regs, 0x03 );
rtc_tod->ticks = ICM7170_GetField( imc1770_regs, 0x00 );
}
/* PAGE
*
* ICM7170_SetTOD
*
* This routine sets the real time clock
*
* Input parameters:
* imc1770_regs - pointer to the register base address.
* icm1770_freq - oscillator frequency
* rtc_tod - time of day to set
*
* Output parameters:
*
* Return values:
*/
void ICM7170_SetTOD(
volatile unsigned char *imc1770_regs,
rtems_unsigned8 icm1770_freq,
rtems_time_of_day *rtc_tod
)
{
int ticks;
int year;
year = rtc_tod->year;
if ( year >= 2088 ) /* plan ahead :) */
rtems_fatal_error_occurred( 0xBAD0BAD0 );
if ( year >= 2000 )
year -= 2000;
else
year -= 1900;
ICM7170_SetField( imc1770_regs, 0x11, (0x04 |icm1770_freq ) );
ICM7170_SetField( imc1770_regs, 0x06, year );
ICM7170_SetField( imc1770_regs, 0x04, rtc_tod->month );
ICM7170_SetField( imc1770_regs, 0x05, rtc_tod->day );
ICM7170_SetField( imc1770_regs, 0x01, rtc_tod->hour );
ICM7170_SetField( imc1770_regs, 0x02, rtc_tod->minute );
ICM7170_SetField( imc1770_regs, 0x03, rtc_tod->second );
/*
* I don't know which day of week is
*
*/
ICM7170_SetField( imc1770_regs, 0x07, 1 );
ICM7170_SetField( imc1770_regs, 0x11, (0x0c | icm1770_freq) );
}
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