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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "clock-f.h"
#include "test_util.h"
static uint32_t rtc_fired;
static struct rtc_time_reg rtc_irq;
static const int rtc_delay_ms = 500;
/*
* We will be testing that the RTC interrupt timestamp occurs
* within +/- delay_tol_us (tolerance) of the above rtc_delay_ms.
*/
static const int delay_tol_us = MSEC / 2;
/* Override default RTC interrupt handler */
void __rtc_alarm_irq(void)
{
atomic_add(&rtc_fired, 1);
reset_rtc_alarm(&rtc_irq);
}
test_static int test_rtc_alarm(void)
{
struct rtc_time_reg rtc;
uint32_t rtc_diff_us;
const int delay_us = rtc_delay_ms * MSEC;
set_rtc_alarm(0, delay_us, &rtc, 0);
msleep(2 * rtc_delay_ms);
/* Make sure the interrupt fired exactly once. */
TEST_EQ(1, atomic_clear(&rtc_fired), "%d");
rtc_diff_us = get_rtc_diff(&rtc, &rtc_irq);
ccprintf("Target delay was %dus\n", delay_us);
ccprintf("Actual delay was %dus\n", rtc_diff_us);
ccprintf("The delays are expected to be within +/- %dus\n", MSEC / 2);
/* Assume we'll always fire within 500us. May need to be adjusted if
* this doesn't hold.
*
* delay_us-delay_tol_us < rtc_diff_us < delay_us+delay_tol_us
*/
TEST_LT(delay_us - delay_tol_us, rtc_diff_us, "%dus");
TEST_LT(rtc_diff_us, delay_us + delay_tol_us, "%dus");
return EC_SUCCESS;
}
void run_test(int argc, char **argv)
{
test_reset();
RUN_TEST(test_rtc_alarm);
test_print_result();
}
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