u-boot/test/time_ut.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

131 lines
2.6 KiB
C

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