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test/time_ut.c
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * Copyright (c) 2015 Google, Inc * Written by Simon Glass <sjg@chromium.org> |
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*/ #include <common.h> #include <command.h> #include <errno.h> static int test_get_timer(void) { 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); if (start + 1 != next) { printf("%s: iter=%d, start=%lu, next=%lu, expected a difference of 1 ", __func__, iter, start, next); return -EINVAL; } start++; } /* * Check that get_timer(base) matches our elapsed time, allowing that * an extra millisecond may have passed. */ diff = get_timer(base); if (diff != iter && diff != iter + 1) { printf("%s: expected get_timer(base) to match elapsed time: diff=%lu, expected=%d ", __func__, diff, iter); return -EINVAL; } return 0; } static int test_timer_get_us(void) { 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; if (delta < 0) { printf("%s: timer_get_us() went backwards from %lu to %lu ", __func__, prev, next); return -EINVAL; } else if (delta != 0) { if (delta < min) min = delta; prev = next; iter++; } } } if (min != 1) { printf("%s: Minimum microsecond delta should be 1 but is %lu ", __func__, min); return -EINVAL; } return 0; } static int test_time_comparison(void) { 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 ", __func__, delta_us, error); if (abs(error) > 1000) return -EINVAL; return 0; } static int test_udelay(void) { 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 ", __func__, delta, error); if (abs(error) > 100) return -EINVAL; return 0; } |
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int do_ut_time(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) |
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{ int ret = 0; ret |= test_get_timer(); ret |= test_timer_get_us(); ret |= test_time_comparison(); ret |= test_udelay(); printf("Test %s ", ret ? "failed" : "passed"); return ret ? CMD_RET_FAILURE : CMD_RET_SUCCESS; } |