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/*
* Copyright (c) 2016 embedded brains GmbH. All rights reserved.
*
* 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 <bsp.h>
#include <bsp/power.h>
#include <bsp/irq.h>
#include <libchip/chip.h>
#define ATSAM_ENABLE_ALARM_INTERRUPT RTC_IER_ALREN
static void set_rtc_alarm_interrupt(uint32_t interval)
{
Rtc *rtc = RTC;
uint8_t hour;
uint8_t minute;
uint8_t second;
uint32_t time;
/* Clear current status register */
RTC_ClearSCCR(rtc, 0x3F);
RTC_GetTime(rtc, &hour, &minute, &second);
time = UINT32_C(3600) * hour + UINT32_C(60) * minute + second;
time = (time + interval) % (UINT32_C(24) * 3600);
second = (uint8_t) (time % 60);
minute = (uint8_t) ((time / 60) % 60);
hour = (uint8_t) (time / 3600);
if (interval < 60) {
RTC_SetTimeAlarm(rtc, NULL, NULL, &second);
} else if (interval < 3600) {
RTC_SetTimeAlarm(rtc, NULL, &minute, &second);
} else {
RTC_SetTimeAlarm(rtc, &hour, &minute, &second);
}
RTC_EnableIt(rtc, ATSAM_ENABLE_ALARM_INTERRUPT);
}
static void rtc_interrupt_handler(void *arg)
{
atsam_power_data_rtc_driver *rtc_data;
rtc_data = (atsam_power_data_rtc_driver *)arg;
set_rtc_alarm_interrupt(rtc_data->interval);
}
static void rtc_alarm_handler(void *arg)
{
Rtc *rtc = RTC;
rtems_status_code sc;
/* Clear current status register */
RTC_ClearSCCR(rtc, 0x3F);
/* Switch off all RTC interrupts */
RTC_DisableIt(rtc, 0x1F);
/* Install RTC interrupt handler */
sc = rtems_interrupt_handler_install(RTC_IRQn,
"RTC",
RTEMS_INTERRUPT_UNIQUE,
rtc_interrupt_handler,
arg
);
assert(sc == RTEMS_SUCCESSFUL);
}
static void set_time(void)
{
rtems_time_of_day tod;
rtems_status_code sc;
atsam_rtc_get_time(&tod);
sc = rtems_clock_set(&tod);
assert(sc == RTEMS_SUCCESSFUL);
}
void atsam_power_handler_rtc_driver(
const atsam_power_control *control,
atsam_power_state state
)
{
atsam_power_data_rtc_driver *rtc_data;
rtems_interrupt_level level;
Rtc *rtc = RTC;
rtc_data = (atsam_power_data_rtc_driver *)control->data.arg;
switch (state) {
case ATSAM_POWER_ON:
RTC_DisableIt(rtc, ATSAM_ENABLE_ALARM_INTERRUPT);
set_time();
break;
case ATSAM_POWER_OFF:
set_rtc_alarm_interrupt(rtc_data->interval);
break;
case ATSAM_POWER_INIT:
/* Enable fast startup via RTC alarm */
rtems_interrupt_disable(level);
PMC->PMC_FSMR |= PMC_FSMR_RTCAL;
rtems_interrupt_enable(level);
rtc_alarm_handler(rtc_data);
break;
default:
break;
}
}
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