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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [powerpc/] [score603e/] [tod/] [tod.c] - Rev 30
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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: tod.c,v 1.2 2001-09-27 12:01:04 chris Exp $ */ #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 Vista 603e's use of the ICM7170 RTC/NVRAM * and should remain in this file. */ void setRealTimeToRTEMS() { rtems_time_of_day rtc_tod; ICM7170_GetTOD( SCORE603E_RTC_ADDRESS, SCORE_RTC_FREQUENCY, &rtc_tod ); rtems_clock_set( &rtc_tod ); } void setRealTimeFromRTEMS() { rtems_time_of_day rtems_tod; rtems_clock_get( RTEMS_CLOCK_GET_TOD, &rtems_tod ); ICM7170_SetTOD( SCORE603E_RTC_ADDRESS, SCORE_RTC_FREQUENCY, &rtems_tod ); } int checkRealTime() { rtems_time_of_day rtems_tod; rtems_time_of_day rtc_tod; ICM7170_GetTOD( SCORE603E_RTC_ADDRESS, SCORE_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. * XXX Make static */ static int ICM7170_GetField( volatile unsigned char *imc1770_regs, int reg ) { unsigned char x; x = imc1770_regs[reg*4]; return x; } static void ICM7170_SetField( volatile unsigned char *imc1770_regs, int reg, unsigned char d ) { imc1770_regs[reg*4] = d; } 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; } /* Latch times */ /* rtc_tod->ticks = */ 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 ); } void ICM7170_SetTOD( volatile unsigned char *imc1770_regs, rtems_unsigned8 icm1770_freq, rtems_time_of_day *rtc_tod ) { 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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