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/*
* Copyright (c) 2021-2022 Arm Limited. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "timer_simple_platform.h"
#include "log_macros.h" /* Logging macros. */
#include "RTE_Components.h" /* CPU definitions and functions. */
#include <inttypes.h>
static uint64_t cpu_cycle_count = 0; /* 64-bit cpu cycle counter */
extern uint32_t SystemCoreClock; /* Expected to come from the cmsis-device lib */
/**
* @brief Gets the system tick triggered cycle counter for the CPU.
* @return 64-bit counter value.
**/
static uint64_t Get_SysTick_Cycle_Count(void);
/**
* SysTick initialisation
*/
static int Init_SysTick(void);
/**
* @brief Adds one PMU counter to the counters' array
* @param value Value of the counter
* @param name Name for the given counter
* @param unit Unit for the "value"
* @param counters Pointer to the counter struct - the one to be populated.
* @return true if successfully added, false otherwise
*/
static bool add_pmu_counter(
uint64_t value,
const char* name,
const char* unit,
pmu_counters* counters);
void platform_reset_counters(void)
{
if (0 != Init_SysTick()) {
printf_err("Failed to initialise system tick config\n");
return;
}
#if defined(ARM_NPU)
ethosu_pmu_init();
#endif /* defined (ARM_NPU) */
debug("system tick config ready\n");
}
void platform_get_counters(pmu_counters* counters)
{
counters->num_counters = 0;
counters->initialised = true;
uint32_t i = 0;
#if defined (ARM_NPU)
ethosu_pmu_counters npu_counters = ethosu_get_pmu_counters();
for (i = 0; i < ETHOSU_PMU_NCOUNTERS; ++i) {
add_pmu_counter(
npu_counters.npu_evt_counters[i].counter_value,
npu_counters.npu_evt_counters[i].name,
npu_counters.npu_evt_counters[i].unit,
counters);
}
for (i = 0; i < ETHOSU_DERIVED_NCOUNTERS; ++i) {
add_pmu_counter(
npu_counters.npu_derived_counters[i].counter_value,
npu_counters.npu_derived_counters[i].name,
npu_counters.npu_derived_counters[i].unit,
counters);
}
add_pmu_counter(
npu_counters.npu_total_ccnt,
"NPU TOTAL",
"cycles",
counters);
#else /* defined (ARM_NPU) */
UNUSED(i);
#endif /* defined (ARM_NPU) */
#if defined(CPU_PROFILE_ENABLED)
add_pmu_counter(
Get_SysTick_Cycle_Count(),
"CPU TOTAL",
"cycles",
counters);
#endif /* defined(CPU_PROFILE_ENABLED) */
#if !defined(CPU_PROFILE_ENABLED)
UNUSED(Get_SysTick_Cycle_Count);
#if !defined(ARM_NPU)
UNUSED(add_pmu_counter);
#endif /* !defined(ARM_NPU) */
#endif /* !defined(CPU_PROFILE_ENABLED) */
}
void SysTick_Handler(void)
{
/* Increment the cycle counter based on load value. */
cpu_cycle_count += SysTick->LOAD + 1;
}
/**
* Gets the current SysTick derived counter value
*/
static uint64_t Get_SysTick_Cycle_Count(void)
{
uint32_t systick_val;
NVIC_DisableIRQ(SysTick_IRQn);
systick_val = SysTick->VAL & SysTick_VAL_CURRENT_Msk;
NVIC_EnableIRQ(SysTick_IRQn);
return cpu_cycle_count + (SysTick->LOAD - systick_val);
}
/**
* SysTick initialisation
*/
static int Init_SysTick(void)
{
const uint32_t ticks_10ms = SystemCoreClock/100 + 1;
int err = 0;
/* Reset CPU cycle count value. */
cpu_cycle_count = 0;
/* Changing configuration for sys tick => guard from being
* interrupted. */
NVIC_DisableIRQ(SysTick_IRQn);
/* SysTick init - this will enable interrupt too. */
err = SysTick_Config(ticks_10ms);
/* Enable interrupt again. */
NVIC_EnableIRQ(SysTick_IRQn);
/* Wait for SysTick to kick off */
while (!err && !SysTick->VAL) {
__NOP();
}
return err;
}
static bool add_pmu_counter(uint64_t value,
const char* name,
const char* unit,
pmu_counters* counters)
{
const uint32_t idx = counters->num_counters;
if (idx < NUM_PMU_COUNTERS) {
counters->counters[idx].value = value;
counters->counters[idx].name = name;
counters->counters[idx].unit = unit;
++counters->num_counters;
return true;
}
printf_err("Failed to add PMU counter!\n");
return false;
}
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