/* SPDX-License-Identifier: BSD-2-Clause */

/**
 * @file
 *
 * @ingroup RTEMSBSPsARMLPC24XX
 *
 * @brief Benchmark timer support.
 */

/*
 * Copyright (c) 2008, 2009 embedded brains GmbH.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <rtems.h>
#include <bsp.h>
#include <rtems/btimer.h>

#include <bsp/system-clocks.h>

bool benchmark_timer_find_average_overhead = false;

static uint32_t benchmark_timer_base;

void benchmark_timer_initialize(void)
{
  benchmark_timer_base = lpc24xx_timer();
}

benchmark_timer_t benchmark_timer_read(void)
{
  uint32_t delta = lpc24xx_timer() - benchmark_timer_base;

  if (benchmark_timer_find_average_overhead) {
    return delta;
  } else {
    /* Value determined by tmck for NCS board */
    if (delta > 74) {
      return delta - 74;
    } else {
      return 0;
    }
  }
}

void benchmark_timer_disable_subtracting_average_overhead(bool find_average_overhead )
{
  benchmark_timer_find_average_overhead = find_average_overhead;
}