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8271f5d4c3
Sometimes the time functions are incorrect due to bad time support on a board. Add a unit test which tries to detect this. Signed-off-by: Simon Glass <sjg@chromium.org>
137 lines
2.7 KiB
C
137 lines
2.7 KiB
C
/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <errno.h>
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static int test_get_timer(void)
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{
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ulong base, start, next, diff;
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int iter;
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base = get_timer(0);
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start = get_timer(0);
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for (iter = 0; iter < 10; iter++) {
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do {
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next = get_timer(0);
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} while (start == next);
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if (start + 1 != next) {
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printf("%s: iter=%d, start=%lu, next=%lu, expected a difference of 1\n",
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__func__, iter, start, next);
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return -EINVAL;
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}
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start++;
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}
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/*
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* Check that get_timer(base) matches our elapsed time, allowing that
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* an extra millisecond may have passed.
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*/
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diff = get_timer(base);
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if (diff != iter && diff != iter + 1) {
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printf("%s: expected get_timer(base) to match elapsed time: diff=%lu, expected=%d\n",
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__func__, diff, iter);
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return -EINVAL;
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}
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return 0;
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}
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static int test_timer_get_us(void)
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{
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ulong prev, next, min = 1000000;
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long delta;
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int iter;
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/* Find the minimum delta we can measure, in microseconds */
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prev = timer_get_us();
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for (iter = 0; iter < 100; ) {
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next = timer_get_us();
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if (next != prev) {
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delta = next - prev;
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if (delta < 0) {
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printf("%s: timer_get_us() went backwards from %lu to %lu\n",
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__func__, prev, next);
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return -EINVAL;
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} else if (delta != 0) {
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if (delta < min)
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min = delta;
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prev = next;
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iter++;
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}
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}
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}
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if (min != 1) {
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printf("%s: Minimum microsecond delta should be 1 but is %lu\n",
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__func__, min);
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return -EINVAL;
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}
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return 0;
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}
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static int test_time_comparison(void)
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{
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ulong start_us, end_us, delta_us;
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long error;
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ulong start;
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start = get_timer(0);
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start_us = timer_get_us();
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while (get_timer(start) < 1000)
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;
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end_us = timer_get_us();
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delta_us = end_us - start_us;
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error = delta_us - 1000000;
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printf("%s: Microsecond time for 1 second: %lu, error = %ld\n",
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__func__, delta_us, error);
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if (abs(error) > 1000)
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return -EINVAL;
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return 0;
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}
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static int test_udelay(void)
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{
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long error;
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ulong start, delta;
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int iter;
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start = get_timer(0);
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for (iter = 0; iter < 1000; iter++)
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udelay(1000);
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delta = get_timer(start);
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error = delta - 1000;
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printf("%s: Delay time for 1000 udelay(1000): %lu ms, error = %ld\n",
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__func__, delta, error);
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if (abs(error) > 100)
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return -EINVAL;
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return 0;
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}
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static int do_ut_time(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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int ret = 0;
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ret |= test_get_timer();
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ret |= test_timer_get_us();
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ret |= test_time_comparison();
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ret |= test_udelay();
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printf("Test %s\n", ret ? "failed" : "passed");
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return ret ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
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}
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U_BOOT_CMD(
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ut_time, 1, 1, do_ut_time,
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"Very basic test of time functions",
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""
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);
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