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