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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.org/license/LICENSE.
*/
#include <rtems.h>
#include <rtems/rtc.h>
#include <rtems/tod.h>
#include <rtems/libio.h>
#include <rtems/rtems/clockimpl.h>
#include <libchip/rtc.h>
/*
* Configuration Information
*/
static rtems_device_minor_number RTC_Minor = UINT32_MAX;
static bool RTC_Is_present(void)
{
return RTC_Minor != UINT32_MAX;
}
/*
* 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;
break;
}
}
if ( !RTC_Is_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( RTC_DEVICE_NAME, 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);
}
}
setRealTimeToRTEMS();
return RTEMS_SUCCESSFUL;
}
rtems_device_driver rtc_read(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
int rv = 0;
rtems_libio_rw_args_t *rw = arg;
rtems_time_of_day *tod = (rtems_time_of_day *) rw->buffer;
rw->offset = 0;
rw->bytes_moved = 0;
if (!RTC_Is_present()) {
return RTEMS_NOT_CONFIGURED;
}
if (rw->count != sizeof( rtems_time_of_day)) {
return RTEMS_INVALID_SIZE;
}
rv = RTC_Table [RTC_Minor].pDeviceFns->deviceGetTime(
RTC_Minor,
tod
);
if (rv != 0) {
return RTEMS_IO_ERROR;
}
rw->bytes_moved = rw->count;
return RTEMS_SUCCESSFUL;
}
rtems_device_driver rtc_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
int rv = 0;
rtems_libio_rw_args_t *rw = arg;
const rtems_time_of_day *tod = (const rtems_time_of_day *) rw->buffer;
rw->offset = 0;
rw->bytes_moved = 0;
if (!RTC_Is_present()) {
return RTEMS_NOT_CONFIGURED;
}
if (rw->count != sizeof( rtems_time_of_day)) {
return RTEMS_INVALID_SIZE;
}
rv = RTC_Table [RTC_Minor].pDeviceFns->deviceSetTime(
RTC_Minor,
tod
);
if (rv != 0) {
return RTEMS_IO_ERROR;
}
rw->bytes_moved = rw->count;
return RTEMS_SUCCESSFUL;
}
rtems_device_driver rtc_open(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
return RTEMS_SUCCESSFUL;
}
rtems_device_driver rtc_close(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
return RTEMS_SUCCESSFUL;
}
rtems_device_driver rtc_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
return RTEMS_NOT_IMPLEMENTED;
}
/*
* This routine copies the time from the real time clock to RTEMS
*/
void setRealTimeToRTEMS()
{
rtems_time_of_day rtc_tod;
if (!RTC_Is_present())
return;
RTC_Table[RTC_Minor].pDeviceFns->deviceGetTime(RTC_Minor, &rtc_tod);
rtems_clock_set( &rtc_tod );
}
/*
* setRealTimeFromRTEMS
*
* This routine copies the time from RTEMS to the real time clock
*/
void setRealTimeFromRTEMS(void)
{
rtems_time_of_day rtems_tod;
if (!RTC_Is_present())
return;
rtems_clock_get_tod( &rtems_tod );
RTC_Table[RTC_Minor].pDeviceFns->deviceSetTime(RTC_Minor, &rtems_tod);
}
/*
* getRealTime
*
* This routine reads the current time from the RTC.
*/
void getRealTime(
rtems_time_of_day *tod
)
{
if (!RTC_Is_present())
return;
RTC_Table[RTC_Minor].pDeviceFns->deviceGetTime(RTC_Minor, tod);
}
/*
* setRealTime
*
* This routine sets the RTC.
*/
int setRealTime(
const rtems_time_of_day *tod
)
{
if (!RTC_Is_present())
return -1;
if ( !_TOD_Validate(tod) )
return -1;
RTC_Table[RTC_Minor].pDeviceFns->deviceSetTime(RTC_Minor, tod);
return 0;
}
/*
* checkRealTime
*
* This routine reads the returns the variance betweent the real time and
* RTEMS time.
*/
int checkRealTime(void)
{
rtems_time_of_day rtems_tod;
rtems_time_of_day rtc_tod;
uint32_t rtems_time;
uint32_t rtc_time;
if (!RTC_Is_present())
return -1;
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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