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/*
* Real Time Clock Driver Wrapper for Libchip
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <rtems.h>
#include <libchip/rtc.h>
/*
* Configuration Information
*/
extern unsigned long RTC_Count;
extern rtems_device_minor_number RTC_Minor;
int RTC_Present;
/*
* rtc_initialize
*
* Initialize the RTC driver
*/
rtems_device_driver rtc_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor_arg,
void *arg
)
{
rtems_device_minor_number minor;
rtems_status_code status;
for (minor=0; minor < RTC_Count ; minor++) {
/*
* First perform the configuration dependent probe, then the
* device dependent probe
*/
if (RTC_Table[minor].deviceProbe && RTC_Table[minor].deviceProbe(minor)) {
/*
* Use this device as the primary RTC
*/
RTC_Minor = minor;
RTC_Present = 1;
break;
}
}
if ( !RTC_Present ) {
/*
* Failed to find an RTC -- this is not a fatal error.
*/
return RTEMS_INVALID_NUMBER;
}
/*
* Register and initialize the primary RTC's
*/
status = rtems_io_register_name( "/dev/rtc", major, RTC_Minor );
if (status != RTEMS_SUCCESSFUL) {
rtems_fatal_error_occurred(status);
}
RTC_Table[minor].pDeviceFns->deviceInitialize( RTC_Minor );
/*
* Now initialize any secondary RTC's
*/
for ( minor++ ; minor<RTC_Count ; minor++) {
/*
* First perform the configuration dependent probe, then the
* device dependent probe
*/
if (RTC_Table[minor].deviceProbe && RTC_Table[minor].deviceProbe(minor)) {
status = rtems_io_register_name(
RTC_Table[minor].sDeviceName,
major,
minor );
if (status != RTEMS_SUCCESSFUL) {
rtems_fatal_error_occurred(status);
}
/*
* Initialize the hardware device.
*/
RTC_Table[minor].pDeviceFns->deviceInitialize(minor);
}
}
return RTEMS_SUCCESSFUL;
}
/*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;
if (!RTC_Present)
return;
RTC_Table[RTC_Minor].pDeviceFns->deviceGetTime(RTC_Minor, &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;
if (!RTC_Present)
return;
rtems_clock_get( RTEMS_CLOCK_GET_TOD, &rtems_tod );
RTC_Table[RTC_Minor].pDeviceFns->deviceSetTime(RTC_Minor, &rtems_tod);
}
/*PAGE
*
* getRealTime
*
* This routine reads the current time from the RTC.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: NONE
*/
void getRealTime(
rtems_time_of_day *tod
)
{
if (!RTC_Present)
return;
RTC_Table[RTC_Minor].pDeviceFns->deviceGetTime(RTC_Minor, tod);
}
/*PAGE
*
* setRealTime
*
* This routine sets the RTC.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: NONE
*/
/* XXX this routine should be part of the public RTEMS interface */
rtems_boolean _TOD_Validate( rtems_time_of_day *tod );
int setRealTime(
rtems_time_of_day *tod
)
{
if (!RTC_Present)
return -1;
if ( !_TOD_Validate(tod) )
return -1;
RTC_Table[RTC_Minor].pDeviceFns->deviceSetTime(RTC_Minor, tod);
return 0;
}
/*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.
*/
/* XXX this routine should be part of the public RTEMS interface */
uint32_t _TOD_To_seconds( rtems_time_of_day *tod );
int checkRealTime()
{
rtems_time_of_day rtems_tod;
rtems_time_of_day rtc_tod;
uint32_t rtems_time;
uint32_t rtc_time;
if (!RTC_Present)
return -1;
rtems_clock_get( RTEMS_CLOCK_GET_TOD, &rtems_tod );
RTC_Table[RTC_Minor].pDeviceFns->deviceGetTime(RTC_Minor, &rtc_tod);
rtems_time = _TOD_To_seconds( &rtems_tod );
rtc_time = _TOD_To_seconds( &rtc_tod );
return rtems_time - rtc_time;
}
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