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/**
* @file
*
* @ingroup raspberrypi
*
* @brief Benchmark timer support.
*/
/*
* Copyright (c) 2013 by Alan Cudmore
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
*
* http://www.rtems.com/license/LICENSE
*
*/
#include <rtems.h>
#include <rtems/timerdrv.h>
#include <bsp/raspberrypi.h>
static bool benchmark_timer_find_average_overhead = false;
static uint64_t benchmark_timer_base;
void benchmark_timer_initialize(void)
{
benchmark_timer_base = BCM2835_REG(BCM2835_GPU_TIMER_CLO);
}
uint32_t benchmark_timer_read(void)
{
uint32_t delta = BCM2835_REG(BCM2835_GPU_TIMER_CLO) - benchmark_timer_base;
if (benchmark_timer_find_average_overhead)
{
return delta;
}
else
{
return BCM2835_REG(BCM2835_GPU_TIMER_CLO);
}
}
void benchmark_timer_disable_subtracting_average_overhead(bool find_average_overhead)
{
benchmark_timer_find_average_overhead = find_average_overhead;
}
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