130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
/*
|
|
* Copyright (c) 2021 NXP
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#define DT_DRV_COMPAT nxp_os_timer
|
|
|
|
#include <drivers/timer/system_timer.h>
|
|
#include <sys_clock.h>
|
|
#include <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;
|
|
|
|
static void mcux_lpc_ostick_isr(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);
|
|
}
|
|
|
|
int sys_clock_driver_init(const struct device *device)
|
|
{
|
|
ARG_UNUSED(device);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
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);
|
|
}
|