134 lines
2.8 KiB
C
134 lines
2.8 KiB
C
/*
|
|
* Copyright (c) 2018 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
#include <zephyr/init.h>
|
|
#include <zephyr/drivers/timer/system_timer.h>
|
|
#include <zephyr/sys_clock.h>
|
|
#include <zephyr/spinlock.h>
|
|
#include <zephyr/irq.h>
|
|
|
|
#define TIMER_IRQ UTIL_CAT(XCHAL_TIMER, \
|
|
UTIL_CAT(CONFIG_XTENSA_TIMER_ID, _INTERRUPT))
|
|
|
|
#define CYC_PER_TICK (sys_clock_hw_cycles_per_sec() \
|
|
/ 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
|
|
|
|
static struct k_spinlock lock;
|
|
static unsigned int last_count;
|
|
|
|
#if defined(CONFIG_TEST)
|
|
const int32_t z_sys_timer_irq_for_test = UTIL_CAT(XCHAL_TIMER,
|
|
UTIL_CAT(CONFIG_XTENSA_TIMER_ID, _INTERRUPT));
|
|
#endif
|
|
|
|
static void set_ccompare(uint32_t val)
|
|
{
|
|
__asm__ volatile ("wsr.CCOMPARE" STRINGIFY(CONFIG_XTENSA_TIMER_ID) " %0"
|
|
:: "r"(val));
|
|
}
|
|
|
|
static uint32_t ccount(void)
|
|
{
|
|
uint32_t val;
|
|
|
|
__asm__ volatile ("rsr.CCOUNT %0" : "=r"(val));
|
|
return val;
|
|
}
|
|
|
|
static void ccompare_isr(const void *arg)
|
|
{
|
|
ARG_UNUSED(arg);
|
|
|
|
k_spinlock_key_t key = k_spin_lock(&lock);
|
|
uint32_t curr = ccount();
|
|
uint32_t dticks = (curr - last_count) / CYC_PER_TICK;
|
|
|
|
last_count += dticks * CYC_PER_TICK;
|
|
|
|
if (!IS_ENABLED(CONFIG_TICKLESS_KERNEL)) {
|
|
uint32_t next = last_count + CYC_PER_TICK;
|
|
|
|
if ((int32_t)(next - curr) < MIN_DELAY) {
|
|
next += CYC_PER_TICK;
|
|
}
|
|
set_ccompare(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);
|
|
uint32_t curr = ccount(), cyc, adj;
|
|
|
|
/* Round up to next tick boundary */
|
|
cyc = ticks * CYC_PER_TICK;
|
|
adj = (curr - 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;
|
|
cyc += last_count;
|
|
|
|
if ((cyc - curr) < MIN_DELAY) {
|
|
cyc += CYC_PER_TICK;
|
|
}
|
|
|
|
set_ccompare(cyc);
|
|
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 = (ccount() - last_count) / CYC_PER_TICK;
|
|
|
|
k_spin_unlock(&lock, key);
|
|
return ret;
|
|
}
|
|
|
|
uint32_t sys_clock_cycle_get_32(void)
|
|
{
|
|
return ccount();
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
void smp_timer_init(void)
|
|
{
|
|
set_ccompare(ccount() + CYC_PER_TICK);
|
|
irq_enable(TIMER_IRQ);
|
|
}
|
|
#endif
|
|
|
|
static int sys_clock_driver_init(void)
|
|
{
|
|
|
|
IRQ_CONNECT(TIMER_IRQ, 0, ccompare_isr, 0, 0);
|
|
set_ccompare(ccount() + CYC_PER_TICK);
|
|
irq_enable(TIMER_IRQ);
|
|
return 0;
|
|
}
|
|
|
|
SYS_INIT(sys_clock_driver_init, PRE_KERNEL_2,
|
|
CONFIG_SYSTEM_CLOCK_INIT_PRIORITY);
|