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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#include <errno.h>
#include <time.h>
#include <linux/delay.h>
#include <test/lib.h>
#include <test/ut.h>
static int test_get_timer(struct unit_test_state *uts)
{
ulong base, start, next, diff;
int iter;
base = get_timer(0);
start = get_timer(0);
for (iter = 0; iter < 10; iter++) {
do {
next = get_timer(0);
} while (start == next);
ut_asserteq(start + 1, next);
start++;
}
/*
* Check that get_timer(base) matches our elapsed time, allowing that
* an extra millisecond may have passed.
*/
diff = get_timer(base);
ut_assert(diff == iter || diff == iter + 1);
return 0;
}
LIB_TEST(test_get_timer, 0);
static int test_timer_get_us(struct unit_test_state *uts)
{
ulong prev, next, min = 1000000;
long delta;
int iter;
/* Find the minimum delta we can measure, in microseconds */
prev = timer_get_us();
for (iter = 0; iter < 100; ) {
next = timer_get_us();
if (next != prev) {
delta = next - prev;
ut_assert(delta >= 0);
if (delta) {
if (delta < min)
min = delta;
prev = next;
iter++;
}
}
}
ut_asserteq(1, min);
return 0;
}
LIB_TEST(test_timer_get_us, 0);
static int test_time_comparison(struct unit_test_state *uts)
{
ulong start_us, end_us, delta_us;
long error;
ulong start;
start = get_timer(0);
start_us = timer_get_us();
while (get_timer(start) < 1000)
;
end_us = timer_get_us();
delta_us = end_us - start_us;
error = delta_us - 1000000;
printf("%s: Microsecond time for 1 second: %lu, error = %ld\n",
__func__, delta_us, error);
ut_assert(abs(error) <= 1000);
return 0;
}
LIB_TEST(test_time_comparison, 0);
static int test_udelay(struct unit_test_state *uts)
{
long error;
ulong start, delta;
int iter;
start = get_timer(0);
for (iter = 0; iter < 1000; iter++)
udelay(1000);
delta = get_timer(start);
error = delta - 1000;
printf("%s: Delay time for 1000 udelay(1000): %lu ms, error = %ld\n",
__func__, delta, error);
ut_assert(abs(error) <= 100);
return 0;
}
LIB_TEST(test_udelay, 0);
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