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/**
* @file
*
* @ingroup RTEMSBSPsARMTMS570_clocks
*
* @brief Cortex-R performace counters
*
* The counters setup functions are these which has been suggested
* on StackOverflow
*
* Code is probably for use on Cortex-A without modifications as well.
*
* http://stackoverflow.com/questions/3247373/how-to-measure-program-execution-time-in-arm-cortex-a8-processor
*/
/*
* Copyright (c) 2014 Pavel Pisa <pisa@cmp.felk.cvut.cz>
*
* Czech Technical University in Prague
* Zikova 1903/4
* 166 36 Praha 6
* Czech Republic
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <rtems/counter.h>
#include <rtems/sysinit.h>
#include <libcpu/arm-cp15.h>
#include <bsp.h>
static void tms570_cpu_counter_initialize(void)
{
uint32_t cycle_counter;
uint32_t pmcr;
cycle_counter = ARM_CP15_PMCLRSET_CYCLE_COUNTER;
arm_cp15_set_performance_monitors_interrupt_enable_clear(cycle_counter);
arm_cp15_set_performance_monitors_count_enable_set(cycle_counter);
pmcr = arm_cp15_get_performance_monitors_control();
pmcr &= ~ARM_CP15_PMCR_D;
pmcr |= ARM_CP15_PMCR_E;
arm_cp15_set_performance_monitors_control(pmcr);
}
uint32_t _CPU_Counter_frequency(void)
{
return 2 * BSP_PLL_OUT_CLOCK;
}
CPU_Counter_ticks _CPU_Counter_read(void)
{
return arm_cp15_get_performance_monitors_cycle_count();
}
RTEMS_SYSINIT_ITEM(
tms570_cpu_counter_initialize,
RTEMS_SYSINIT_CPU_COUNTER,
RTEMS_SYSINIT_ORDER_FIRST
);
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