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/*
* @file cpucounterread.c
*
* @author Miguel Masmano <mmasmano@fentiss.com>
*
* @copyright
* Copyright 2016 Fent Innovative Software Solutions (FENTISS).
* All rights reserved.
*
* Copyright 2017 embedded brains GmbH.
*
* 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 <libcpu/arm-cp15.h>
#include <bsp.h>
#include <xm.h>
#ifdef XM_TMS570_USE_PMU_FOR_CPU_COUNTER
/* PMCCNTR */
ARM_CP15_TEXT_SECTION static inline uint32_t
arm_cp15_get_performance_monitors_cycle_count(void)
{
ARM_SWITCH_REGISTERS;
uint32_t val;
__asm__ volatile (
ARM_SWITCH_TO_ARM
"mrc p15, 0, %[val], c9, c13, 0\n"
ARM_SWITCH_BACK
: [val] "=&r" (val) ARM_SWITCH_ADDITIONAL_OUTPUT
);
return val;
}
#endif
CPU_Counter_ticks _CPU_Counter_read(void)
{
#ifdef XM_TMS570_USE_PMU_FOR_CPU_COUNTER
return arm_cp15_get_performance_monitors_cycle_count();
#else
xmTime_t cTime;
XM_get_time(XM_HW_CLOCK, &cTime);
return (CPU_Counter_ticks)cTime;
#endif
}
void xm_tms570_cpu_counter_initialize(void)
{
#ifdef XM_TMS570_USE_PMU_FOR_CPU_COUNTER
rtems_counter_initialize_converter(XM_TMS570_GCLK);
#else
rtems_counter_initialize_converter(1000000);
#endif
}
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