| /* |
| * Copyright (c) 2021 NXP |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define DT_DRV_COMPAT nxp_os_timer |
| |
| #include <zephyr/device.h> |
| #include <zephyr/drivers/timer/system_timer.h> |
| #include <zephyr/sys_clock.h> |
| #include <zephyr/spinlock.h> |
| #include "fsl_ostimer.h" |
| #include "fsl_power.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 INT_MAX |
| #define MAX_TICKS ((MAX_CYC - CYC_PER_TICK) / CYC_PER_TICK) |
| #define MIN_DELAY 1000 |
| |
| #define TICKLESS IS_ENABLED(CONFIG_TICKLESS_KERNEL) |
| |
| static struct k_spinlock lock; |
| static uint64_t last_count; |
| static OSTIMER_Type *base; |
| |
| void mcux_lpc_ostick_isr(const void *arg) |
| { |
| ARG_UNUSED(arg); |
| |
| k_spinlock_key_t key = k_spin_lock(&lock); |
| uint64_t now = OSTIMER_GetCurrentTimerValue(base); |
| uint32_t dticks = (uint32_t)((now - last_count) / CYC_PER_TICK); |
| |
| /* Clear interrupt flag by writing 1. */ |
| base->OSEVENT_CTRL &= ~OSTIMER_OSEVENT_CTRL_OSTIMER_INTENA_MASK; |
| |
| last_count += dticks * CYC_PER_TICK; |
| |
| if (!TICKLESS) { |
| uint64_t next = last_count + CYC_PER_TICK; |
| |
| if ((int64_t)(next - now) < MIN_DELAY) { |
| next += CYC_PER_TICK; |
| } |
| OSTIMER_SetMatchValue(base, next, NULL); |
| } |
| |
| 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 (!IS_ENABLED(CONFIG_TICKLESS_KERNEL)) { |
| /* Only for tickless kernel system */ |
| return; |
| } |
| |
| 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 = OSTIMER_GetCurrentTimerValue(base); |
| 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; |
| } |
| |
| OSTIMER_SetMatchValue(base, cyc + last_count, NULL); |
| |
| k_spin_unlock(&lock, key); |
| } |
| |
| uint32_t sys_clock_elapsed(void) |
| { |
| if (!IS_ENABLED(CONFIG_TICKLESS_KERNEL)) { |
| /* Always return 0 for tickful kernel system */ |
| return 0; |
| } |
| |
| k_spinlock_key_t key = k_spin_lock(&lock); |
| uint32_t ret = ((uint32_t)OSTIMER_GetCurrentTimerValue(base) - |
| (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)OSTIMER_GetCurrentTimerValue(base); |
| } |
| |
| uint64_t sys_clock_cycle_get_64(void) |
| { |
| return OSTIMER_GetCurrentTimerValue(base); |
| } |
| |
| static int sys_clock_driver_init(const struct device *dev) |
| { |
| ARG_UNUSED(dev); |
| |
| /* Configure event timer's ISR */ |
| IRQ_CONNECT(DT_INST_IRQN(0), DT_INST_IRQ(0, priority), |
| mcux_lpc_ostick_isr, NULL, 0); |
| |
| base = (OSTIMER_Type *)DT_INST_REG_ADDR(0); |
| |
| EnableDeepSleepIRQ(DT_INST_IRQN(0)); |
| |
| /* Initialize the OS timer, setting clock configuration. */ |
| OSTIMER_Init(base); |
| |
| last_count = OSTIMER_GetCurrentTimerValue(base); |
| OSTIMER_SetMatchValue(base, last_count + CYC_PER_TICK, NULL); |
| |
| /* Enable event timer interrupt */ |
| irq_enable(DT_INST_IRQN(0)); |
| |
| return 0; |
| } |
| |
| SYS_INIT(sys_clock_driver_init, PRE_KERNEL_2, |
| CONFIG_SYSTEM_CLOCK_INIT_PRIORITY); |