[people/ms/u-boot.git] / test / time_ut.c

/*
 * Copyright (c) 2015 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 * SPDX-License-Identifier:	GPL-2.0+
 */

#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\n",
			       __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\n",
		       __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\n",
				       __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\n",
		       __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\n",
	       __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\n",
	       __func__, delta, error);
	if (abs(error) > 100)
		return -EINVAL;

	return 0;
}

int do_ut_time(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	int ret = 0;

	ret |= test_get_timer();
	ret |= test_timer_get_us();
	ret |= test_time_comparison();
	ret |= test_udelay();

	printf("Test %s\n", ret ? "failed" : "passed");

	return ret ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
}
Commit	Line	Data
8271f5d4 SG	1	/*
	2	* Copyright (c) 2015 Google, Inc
	3	* Written by Simon Glass <sjg@chromium.org>
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7	#include <common.h>
	8	#include <command.h>
	9	#include <errno.h>
	10
	11	static int test_get_timer(void)
	12	{
	13	ulong base, start, next, diff;
	14	int iter;
	15
	16	base = get_timer(0);
	17	start = get_timer(0);
	18	for (iter = 0; iter < 10; iter++) {
	19	do {
	20	next = get_timer(0);
	21	} while (start == next);
	22
	23	if (start + 1 != next) {
	24	printf("%s: iter=%d, start=%lu, next=%lu, expected a difference of 1\n",
	25	__func__, iter, start, next);
	26	return -EINVAL;
	27	}
	28	start++;
	29	}
	30
	31	/*
	32	* Check that get_timer(base) matches our elapsed time, allowing that
	33	* an extra millisecond may have passed.
	34	*/
	35	diff = get_timer(base);
	36	if (diff != iter && diff != iter + 1) {
	37	printf("%s: expected get_timer(base) to match elapsed time: diff=%lu, expected=%d\n",
	38	__func__, diff, iter);
	39	return -EINVAL;
	40	}
	41
	42	return 0;
	43	}
	44
	45	static int test_timer_get_us(void)
	46	{
	47	ulong prev, next, min = 1000000;
	48	long delta;
	49	int iter;
	50
	51	/* Find the minimum delta we can measure, in microseconds */
	52	prev = timer_get_us();
	53	for (iter = 0; iter < 100; ) {
	54	next = timer_get_us();
	55	if (next != prev) {
	56	delta = next - prev;
	57	if (delta < 0) {
	58	printf("%s: timer_get_us() went backwards from %lu to %lu\n",
	59	__func__, prev, next);
	60	return -EINVAL;
	61	} else if (delta != 0) {
	62	if (delta < min)
	63	min = delta;
	64	prev = next;
65	iter++;
66	}
67	}
68	}
69
70	if (min != 1) {
71	printf("%s: Minimum microsecond delta should be 1 but is %lu\n",
72	__func__, min);
73	return -EINVAL;
74	}
75
76	return 0;
77	}
78
79	static int test_time_comparison(void)
80	{
81	ulong start_us, end_us, delta_us;
82	long error;
83	ulong start;
84
85	start = get_timer(0);
86	start_us = timer_get_us();
87	while (get_timer(start) < 1000)
88	;
89	end_us = timer_get_us();
90	delta_us = end_us - start_us;
91	error = delta_us - 1000000;
92	printf("%s: Microsecond time for 1 second: %lu, error = %ld\n",
93	__func__, delta_us, error);
94	if (abs(error) > 1000)
95	return -EINVAL;
96
97	return 0;
98	}
99
100	static int test_udelay(void)
101	{
102	long error;
103	ulong start, delta;
104	int iter;
105
106	start = get_timer(0);
107	for (iter = 0; iter < 1000; iter++)
108	udelay(1000);
109	delta = get_timer(start);
110	error = delta - 1000;
111	printf("%s: Delay time for 1000 udelay(1000): %lu ms, error = %ld\n",
112	__func__, delta, error);
113	if (abs(error) > 100)
114	return -EINVAL;
115
116	return 0;
117	}
118
c812f722	119	int do_ut_time(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
8271f5d4 SG	120	{
	121	int ret = 0;
	122
	123	ret \|= test_get_timer();
	124	ret \|= test_timer_get_us();
	125	ret \|= test_time_comparison();
	126	ret \|= test_udelay();
	127
	128	printf("Test %s\n", ret ? "failed" : "passed");
	129
	130	return ret ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
	131	}