diff options
Diffstat (limited to 'source/application/hal/platforms/bare-metal/timer/baremetal_timer.c')
| -rw-r--r-- | source/application/hal/platforms/bare-metal/timer/baremetal_timer.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/source/application/hal/platforms/bare-metal/timer/baremetal_timer.c b/source/application/hal/platforms/bare-metal/timer/baremetal_timer.c new file mode 100644 index 0000000..7257c1d --- /dev/null +++ b/source/application/hal/platforms/bare-metal/timer/baremetal_timer.c @@ -0,0 +1,243 @@ +/* + * Copyright (c) 2021 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 "bsp.h" +#include "timer.h" + +#include <assert.h> +#include <string.h> + +#if defined (ARM_NPU) + +#include "pmu_ethosu.h" + +/** + * @brief Initialises the PMU and enables the cycle counter. + **/ +static void _init_ethosu_cyclecounter(void); + +/** + * @brief Gets the difference of total NPU cycle counts. + * (includes active and idle) + * @param[in] st Pointer to time_counter value at start time. + * @param[in] end Pointer to time_counter value at end. + * @return Total NPU cycle counts difference between the arguments expressed + * as unsigned 64 bit integer. + **/ +static uint64_t bm_get_npu_total_cycle_diff(time_counter *st, + time_counter *end); + +/** + * @brief Gets the difference in active NPU cycle counts. + * @param[in] st Pointer to time_counter value at start time. + * @param[in] end Pointer to time_counter value at end. + * @return Active NPU cycle counts difference between the arguments expressed + * as unsigned 64 bit integer. + **/ +static uint64_t bm_get_npu_active_cycle_diff(time_counter *st, + time_counter *end); + +#endif /* defined (ARM_NPU) */ + +#if defined(MPS3_PLATFORM) +/** + * @brief Wrapper for getting milliseconds duration between time counters + * @param[in] st Pointer to time_counter value at start time. + * @param[in] end Pointer to time_counter value at end. + * @return Difference in milliseconds between given time counters. + **/ +static time_t bm_get_duration_ms(time_counter *st, time_counter *end); + +/** + * @brief Wrapper for getting microseconds duration between time counters + * @param[in] st Pointer to time_counter value at start time. + * @param[in] end Pointer to time_counter value at end. + * @return Difference in microseconds between given time counters. + **/ +static time_t bm_get_duration_us(time_counter *st, time_counter *end); +#endif /* defined(MPS3_PLATFORM) */ + +/** + * @brief Wrapper for resetting timer. + **/ +static void bm_timer_reset(void); + +/** + * @brief Wrapper for getting the current timer counter. + * @return Current time counter value. + **/ +static time_counter bm_get_time_counter(void); + +/** + * @brief Wrapper for profiler start. + * @return Current profiler start timer counter. + **/ +static time_counter bm_start_profiling(void); + +/** + * @brief Wrapper for profiler end. + * @return Current profiler end timer counter. + **/ +static time_counter bm_stop_profiling(void); + +/** + * @brief Wrapper for getting CPU cycle difference between time counters. + * @return CPU cycle difference between given time counters expressed + * as unsigned 32 bit integer. + **/ +static uint32_t bm_get_cpu_cycles_diff(time_counter *st, time_counter *end); + +/** + * @brief Initialiser for bare metal timer. + * @param[in] timer Platform timer to initialize. + **/ +void init_timer(platform_timer *timer) +{ + assert(timer); + memset(timer, 0, sizeof(*timer)); + + timer->reset = bm_timer_reset; + timer->get_time_counter = bm_get_time_counter; + timer->start_profiling = bm_start_profiling; + timer->stop_profiling = bm_stop_profiling; + timer->get_cpu_cycle_diff = bm_get_cpu_cycles_diff; + timer->cap.cpu_cycles = 1; + +#if defined (MPS3_PLATFORM) + timer->cap.duration_ms = 1; + timer->cap.duration_us = 1; + timer->get_duration_ms = bm_get_duration_ms; + timer->get_duration_us = bm_get_duration_us; +#endif /* defined (MPS3_PLATFORM) */ + +#if defined (ARM_NPU) + /* We are capable of reporting npu cycle counts. */ + timer->cap.npu_cycles = 1; + timer->get_npu_total_cycle_diff = bm_get_npu_total_cycle_diff; + timer->get_npu_active_cycle_diff = bm_get_npu_active_cycle_diff; + _init_ethosu_cyclecounter(); +#endif /* defined (ARM_NPU) */ + + timer->reset(); + timer->inited = 1; +} + +#if defined (ARM_NPU) + +static void _reset_ethosu_counters(void) +{ + /* Reset all cycle and event counters. */ + ETHOSU_PMU_CYCCNT_Reset(); + ETHOSU_PMU_EVCNTR_ALL_Reset(); +} + +static void _init_ethosu_cyclecounter(void) +{ + /* Reset overflow status. */ + ETHOSU_PMU_Set_CNTR_OVS(ETHOSU_PMU_CNT1_Msk | ETHOSU_PMU_CCNT_Msk); + + /* Set the counter #0 to count idle cycles. */ + ETHOSU_PMU_Set_EVTYPER(0, ETHOSU_PMU_NPU_IDLE); + + /* Enable PMU. */ + ETHOSU_PMU_Enable(); + + /* Enable counters for cycle and counter# 0. */ + ETHOSU_PMU_CNTR_Enable(ETHOSU_PMU_CNT1_Msk | ETHOSU_PMU_CCNT_Msk); + + _reset_ethosu_counters(); +} + +static uint64_t bm_get_npu_total_cycle_diff(time_counter *st, time_counter *end) +{ + return end->npu_total_ccnt - st->npu_total_ccnt; +} + +static uint64_t bm_get_npu_active_cycle_diff(time_counter *st, time_counter *end) +{ + /* Check for overflow: The idle counter is 32 bit while the + total cycle count is 64 bit. */ + const uint32_t overflow_status = ETHOSU_PMU_Get_CNTR_OVS(); + + if (ETHOSU_PMU_CNT1_Msk & overflow_status) { + printf_err("EthosU PMU idle counter overflow.\n"); + return 0; + } + + /* Active NPU time = total time - idle time */ + return (bm_get_npu_total_cycle_diff(st, end) + + (uint64_t)(st->npu_idle_ccnt)) - (uint64_t)(end->npu_idle_ccnt); +} + +#endif /* defined (ARM_NPU) */ + +static void bm_timer_reset(void) +{ +#if defined (ARM_NPU) + _init_ethosu_cyclecounter(); +#endif /* defined (ARM_NPU) */ + + timer_reset(); +} + +static time_counter bm_get_time_counter(void) +{ + time_counter t = { + .counter = get_time_counter(), + +#if defined (ARM_NPU) + .npu_idle_ccnt = ETHOSU_PMU_Get_EVCNTR(0), + .npu_total_ccnt = ETHOSU_PMU_Get_CCNTR() +#endif /* defined (ARM_NPU) */ + + }; + +#if defined (ARM_NPU) + debug("NPU total cc: %llu; NPU idle cc: %u\n", + t.npu_total_ccnt, t.npu_idle_ccnt); +#endif /* defined (ARM_NPU) */ + + return t; +} + +static time_counter bm_start_profiling(void) +{ + start_cycle_counter(); + return bm_get_time_counter(); +} + +static time_counter bm_stop_profiling(void) +{ + stop_cycle_counter(); + return bm_get_time_counter(); +} + +static uint32_t bm_get_cpu_cycles_diff(time_counter *st, time_counter *end) +{ + return get_cycle_count_diff(&(st->counter), &(end->counter)); +} + +#if defined(MPS3_PLATFORM) +static time_t bm_get_duration_ms(time_counter *st, time_counter *end) +{ + return get_duration_milliseconds(&(st->counter), &(end->counter)); +} + +static time_t bm_get_duration_us(time_counter *st, time_counter *end) +{ + return get_duration_microseconds(&(st->counter), &(end->counter)); +} +#endif /* defined(MPS3_PLATFORM) */ |