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109 lines
2.6 KiB
109 lines
2.6 KiB
/* |
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* Copyright (c) 2019 Carlo Caione <ccaione@baylibre.com> |
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* |
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* SPDX-License-Identifier: Apache-2.0 |
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*/ |
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#include <drivers/timer/arm_arch_timer.h> |
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#include <drivers/timer/system_timer.h> |
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#include <sys_clock.h> |
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#include <spinlock.h> |
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#include <arch/cpu.h> |
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#define CYC_PER_TICK ((u32_t)((u64_t)sys_clock_hw_cycles_per_sec() \ |
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/ (u64_t)CONFIG_SYS_CLOCK_TICKS_PER_SEC)) |
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#define MAX_TICKS ((0xffffffffu - CYC_PER_TICK) / CYC_PER_TICK) |
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#define MIN_DELAY (1000) |
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static struct k_spinlock lock; |
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static volatile u64_t last_cycle; |
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static void arm_arch_timer_compare_isr(void *arg) |
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{ |
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ARG_UNUSED(arg); |
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k_spinlock_key_t key = k_spin_lock(&lock); |
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u64_t curr_cycle = arm_arch_timer_count(); |
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u32_t delta_ticks = (u32_t)((curr_cycle - last_cycle) / CYC_PER_TICK); |
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last_cycle += delta_ticks * CYC_PER_TICK; |
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if (!IS_ENABLED(CONFIG_TICKLESS_KERNEL) || |
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IS_ENABLED(CONFIG_QEMU_TICKLESS_WORKAROUND)) { |
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u64_t next_cycle = last_cycle + CYC_PER_TICK; |
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if ((s64_t)(next_cycle - curr_cycle) < MIN_DELAY) { |
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next_cycle += CYC_PER_TICK; |
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} |
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arm_arch_timer_set_compare(next_cycle); |
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} |
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k_spin_unlock(&lock, key); |
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z_clock_announce(IS_ENABLED(CONFIG_TICKLESS_KERNEL) ? delta_ticks : 1); |
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} |
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int z_clock_driver_init(struct device *device) |
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{ |
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ARG_UNUSED(device); |
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IRQ_CONNECT(ARM_ARCH_TIMER_IRQ, 0, arm_arch_timer_compare_isr, 0, |
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ARM_TIMER_FLAGS); |
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arm_arch_timer_set_compare(arm_arch_timer_count() + CYC_PER_TICK); |
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arm_arch_timer_enable(true); |
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irq_enable(ARM_ARCH_TIMER_IRQ); |
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return 0; |
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} |
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void z_clock_set_timeout(s32_t ticks, bool idle) |
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{ |
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ARG_UNUSED(idle); |
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#if defined(CONFIG_TICKLESS_KERNEL) && !defined(CONFIG_QEMU_TICKLESS_WORKAROUND) |
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if (idle) { |
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return; |
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} |
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ticks = (ticks == K_TICKS_FOREVER) ? MAX_TICKS : ticks; |
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ticks = MAX(MIN(ticks - 1, (s32_t)MAX_TICKS), 0); |
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k_spinlock_key_t key = k_spin_lock(&lock); |
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u64_t curr_cycle = arm_arch_timer_count(); |
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u32_t req_cycle = ticks * CYC_PER_TICK; |
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/* Round up to next tick boundary */ |
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req_cycle += (u32_t)(curr_cycle - last_cycle) + (CYC_PER_TICK - 1); |
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req_cycle = (req_cycle / CYC_PER_TICK) * CYC_PER_TICK; |
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if ((s32_t)(req_cycle + last_cycle - curr_cycle) < MIN_DELAY) { |
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req_cycle += CYC_PER_TICK; |
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} |
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arm_arch_timer_set_compare(req_cycle + last_cycle); |
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k_spin_unlock(&lock, key); |
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#endif |
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} |
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u32_t z_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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u32_t ret = ((u32_t)arm_arch_timer_count() - (u32_t)last_cycle) |
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/ 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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u32_t z_timer_cycle_get_32(void) |
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{ |
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return (u32_t)arm_arch_timer_count(); |
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}
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