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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
133 lines
2.7 KiB
C
133 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <command.h>
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#include <errno.h>
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#include <time.h>
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#include <linux/delay.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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int do_ut_time(struct cmd_tbl *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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