| /* |
| * Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| #include <soc/soc_caps.h> |
| #include <soc/soc.h> |
| #include <soc/interrupt_core0_reg.h> |
| #include <soc/periph_defs.h> |
| #include <soc/system_reg.h> |
| #include <hal/systimer_hal.h> |
| #include <hal/systimer_ll.h> |
| #include <rom/ets_sys.h> |
| #include <esp_attr.h> |
| |
| #include <zephyr/drivers/interrupt_controller/intc_esp32c3.h> |
| #include <zephyr/drivers/timer/system_timer.h> |
| #include <zephyr/sys_clock.h> |
| #include <soc.h> |
| #include <zephyr/device.h> |
| |
| #define CYC_PER_TICK ((uint32_t)((uint64_t)sys_clock_hw_cycles_per_sec() \ |
| / (uint64_t)CONFIG_SYS_CLOCK_TICKS_PER_SEC)) |
| #define MAX_CYC 0xffffffffu |
| #define MAX_TICKS ((MAX_CYC - CYC_PER_TICK) / CYC_PER_TICK) |
| #define MIN_DELAY 1000 |
| |
| #if defined(CONFIG_TEST) |
| const int32_t z_sys_timer_irq_for_test = DT_IRQN(DT_NODELABEL(systimer0)); |
| #endif |
| |
| #define TICKLESS IS_ENABLED(CONFIG_TICKLESS_KERNEL) |
| |
| static struct k_spinlock lock; |
| static uint64_t last_count; |
| |
| static void set_systimer_alarm(uint64_t time) |
| { |
| systimer_hal_select_alarm_mode(SYSTIMER_ALARM_0, SYSTIMER_ALARM_MODE_ONESHOT); |
| systimer_hal_set_alarm_target(SYSTIMER_ALARM_0, time); |
| systimer_hal_enable_alarm_int(SYSTIMER_ALARM_0); |
| } |
| |
| static uint64_t systimer_alarm(void) |
| { |
| return systimer_hal_get_time(SYSTIMER_COUNTER_1); |
| } |
| |
| static void sys_timer_isr(const void *arg) |
| { |
| ARG_UNUSED(arg); |
| systimer_ll_clear_alarm_int(SYSTIMER_ALARM_0); |
| |
| k_spinlock_key_t key = k_spin_lock(&lock); |
| uint64_t now = systimer_alarm(); |
| |
| uint32_t dticks = (uint32_t)((now - last_count) / CYC_PER_TICK); |
| |
| last_count = now; |
| |
| if (!TICKLESS) { |
| uint64_t next = last_count + CYC_PER_TICK; |
| |
| if ((int64_t)(next - now) < MIN_DELAY) { |
| next += CYC_PER_TICK; |
| } |
| set_systimer_alarm(next); |
| } |
| |
| k_spin_unlock(&lock, key); |
| sys_clock_announce(IS_ENABLED(CONFIG_TICKLESS_KERNEL) ? dticks : 1); |
| } |
| |
| void sys_clock_set_timeout(int32_t ticks, bool idle) |
| { |
| ARG_UNUSED(idle); |
| |
| #if defined(CONFIG_TICKLESS_KERNEL) |
| ticks = ticks == K_TICKS_FOREVER ? MAX_TICKS : ticks; |
| ticks = CLAMP(ticks - 1, 0, (int32_t)MAX_TICKS); |
| |
| k_spinlock_key_t key = k_spin_lock(&lock); |
| uint64_t now = systimer_alarm(); |
| uint32_t adj, cyc = ticks * CYC_PER_TICK; |
| |
| /* Round up to next tick boundary. */ |
| adj = (uint32_t)(now - last_count) + (CYC_PER_TICK - 1); |
| if (cyc <= MAX_CYC - adj) { |
| cyc += adj; |
| } else { |
| cyc = MAX_CYC; |
| } |
| cyc = (cyc / CYC_PER_TICK) * CYC_PER_TICK; |
| |
| if ((int32_t)(cyc + last_count - now) < MIN_DELAY) { |
| cyc += CYC_PER_TICK; |
| } |
| |
| set_systimer_alarm(cyc + last_count); |
| k_spin_unlock(&lock, key); |
| #endif |
| } |
| |
| uint32_t sys_clock_elapsed(void) |
| { |
| if (!IS_ENABLED(CONFIG_TICKLESS_KERNEL)) { |
| return 0; |
| } |
| |
| k_spinlock_key_t key = k_spin_lock(&lock); |
| uint32_t ret = ((uint32_t)systimer_alarm() - (uint32_t)last_count) / CYC_PER_TICK; |
| |
| k_spin_unlock(&lock, key); |
| return ret; |
| } |
| |
| uint32_t sys_clock_cycle_get_32(void) |
| { |
| return (uint32_t)systimer_alarm(); |
| } |
| |
| uint64_t sys_clock_cycle_get_64(void) |
| { |
| return systimer_alarm(); |
| } |
| |
| static int sys_clock_driver_init(const struct device *dev) |
| { |
| ARG_UNUSED(dev); |
| |
| esp_intr_alloc(DT_IRQN(DT_NODELABEL(systimer0)), |
| 0, |
| sys_timer_isr, |
| NULL, |
| NULL); |
| |
| systimer_hal_init(); |
| systimer_hal_connect_alarm_counter(SYSTIMER_ALARM_0, SYSTIMER_COUNTER_1); |
| systimer_hal_enable_counter(SYSTIMER_COUNTER_1); |
| systimer_hal_counter_can_stall_by_cpu(SYSTIMER_COUNTER_1, 0, true); |
| last_count = systimer_alarm(); |
| set_systimer_alarm(last_count + CYC_PER_TICK); |
| |
| return 0; |
| } |
| |
| SYS_INIT(sys_clock_driver_init, PRE_KERNEL_2, |
| CONFIG_SYSTEM_CLOCK_INIT_PRIORITY); |