Eric Lee / smarc-uboot

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test/time_ut.c 2.65 KB
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8271f5d4c   Simon Glass   test: Add a simpl... 
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  /*
   * 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
  ",
  			       __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;
  }
c812f722f   Joe Hershberger   test: dm: Move th... 
124
 
  int do_ut_time(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
8271f5d4c   Simon Glass   test: Add a simpl... 
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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;
  }