]>
git.ipfire.org Git - people/ms/u-boot.git/blob - test/time_ut.c
2 * Copyright (c) 2015 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
4 * SPDX-License-Identifier: GPL-2.0+
11 static int test_get_timer(void)
13 ulong base
, start
, next
, diff
;
18 for (iter
= 0; iter
< 10; iter
++) {
21 } while (start
== next
);
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
);
32 * Check that get_timer(base) matches our elapsed time, allowing that
33 * an extra millisecond may have passed.
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
);
45 static int test_timer_get_us(void)
47 ulong prev
, next
, min
= 1000000;
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();
58 printf("%s: timer_get_us() went backwards from %lu to %lu\n",
59 __func__
, prev
, next
);
61 } else if (delta
!= 0) {
71 printf("%s: Minimum microsecond delta should be 1 but is %lu\n",
79 static int test_time_comparison(void)
81 ulong start_us
, end_us
, delta_us
;
86 start_us
= timer_get_us();
87 while (get_timer(start
) < 1000)
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)
100 static int test_udelay(void)
106 start
= get_timer(0);
107 for (iter
= 0; iter
< 1000; iter
++)
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)
119 int do_ut_time(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
123 ret
|= test_get_timer();
124 ret
|= test_timer_get_us();
125 ret
|= test_time_comparison();
126 ret
|= test_udelay();
128 printf("Test %s\n", ret
? "failed" : "passed");
130 return ret
? CMD_RET_FAILURE
: CMD_RET_SUCCESS
;