[J-u-boot.git] / test / time_ut.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2015 Google, Inc
 * Written by Simon Glass <[email protected]>
 */

#include <common.h>
#include <command.h>
#include <errno.h>
#include <time.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
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
8271f5d4 SG	2	/*
	3	* Copyright (c) 2015 Google, Inc
	4	* Written by Simon Glass <[email protected]>
8271f5d4 SG	5	*/
	6
	7	#include <common.h>
	8	#include <command.h>
	9	#include <errno.h>
1045315d	10	#include <time.h>
8271f5d4 SG	11
	12	static int test_get_timer(void)
	13	{
	14	ulong base, start, next, diff;
	15	int iter;
	16
	17	base = get_timer(0);
	18	start = get_timer(0);
	19	for (iter = 0; iter < 10; iter++) {
	20	do {
	21	next = get_timer(0);
	22	} while (start == next);
	23
	24	if (start + 1 != next) {
	25	printf("%s: iter=%d, start=%lu, next=%lu, expected a difference of 1\n",
	26	__func__, iter, start, next);
	27	return -EINVAL;
	28	}
	29	start++;
	30	}
	31
	32	/*
	33	* Check that get_timer(base) matches our elapsed time, allowing that
	34	* an extra millisecond may have passed.
	35	*/
	36	diff = get_timer(base);
	37	if (diff != iter && diff != iter + 1) {
	38	printf("%s: expected get_timer(base) to match elapsed time: diff=%lu, expected=%d\n",
	39	__func__, diff, iter);
	40	return -EINVAL;
	41	}
	42
	43	return 0;
	44	}
	45
	46	static int test_timer_get_us(void)
	47	{
	48	ulong prev, next, min = 1000000;
	49	long delta;
	50	int iter;
	51
	52	/* Find the minimum delta we can measure, in microseconds */
	53	prev = timer_get_us();
	54	for (iter = 0; iter < 100; ) {
	55	next = timer_get_us();
	56	if (next != prev) {
	57	delta = next - prev;
	58	if (delta < 0) {
	59	printf("%s: timer_get_us() went backwards from %lu to %lu\n",
	60	__func__, prev, next);
	61	return -EINVAL;
	62	} else if (delta != 0) {
	63	if (delta < min)
	64	min = delta;
	65	prev = next;
	66	iter++;
	67	}
	68	}
	69	}
	70
	71	if (min != 1) {
	72	printf("%s: Minimum microsecond delta should be 1 but is %lu\n",
	73	__func__, min);
	74	return -EINVAL;
75	}
76
77	return 0;
78	}
79
80	static int test_time_comparison(void)
81	{
82	ulong start_us, end_us, delta_us;
83	long error;
84	ulong start;
85
86	start = get_timer(0);
87	start_us = timer_get_us();
88	while (get_timer(start) < 1000)
89	;
90	end_us = timer_get_us();
91	delta_us = end_us - start_us;
92	error = delta_us - 1000000;
93	printf("%s: Microsecond time for 1 second: %lu, error = %ld\n",
94	__func__, delta_us, error);
95	if (abs(error) > 1000)
96	return -EINVAL;
97
98	return 0;
99	}
100
101	static int test_udelay(void)
102	{
103	long error;
104	ulong start, delta;
105	int iter;
106
107	start = get_timer(0);
108	for (iter = 0; iter < 1000; iter++)
109	udelay(1000);
110	delta = get_timer(start);
111	error = delta - 1000;
112	printf("%s: Delay time for 1000 udelay(1000): %lu ms, error = %ld\n",
113	__func__, delta, error);
114	if (abs(error) > 100)
115	return -EINVAL;
116
117	return 0;
118	}
119
c812f722	120	int do_ut_time(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
8271f5d4 SG	121	{
	122	int ret = 0;
	123
	124	ret \|= test_get_timer();
	125	ret \|= test_timer_get_us();
	126	ret \|= test_time_comparison();
	127	ret \|= test_udelay();
	128
	129	printf("Test %s\n", ret ? "failed" : "passed");
	130
	131	return ret ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
	132	}