timer.h

Go to the documentation of this file.

/*
 * Copyright (c) 2019 Carlo Caione <ccaione@baylibre.com>
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_ARCH_ARM64_TIMER_H_
#define ZEPHYR_INCLUDE_ARCH_ARM64_TIMER_H_
 
#ifndef _ASMLANGUAGE
 
#include <limits.h>
 
#include <zephyr/drivers/timer/arm_arch_timer.h>
#include <zephyr/types.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define ARM_ARCH_TIMER_IRQ      ARM_TIMER_VIRTUAL_IRQ
#define ARM_ARCH_TIMER_PRIO     ARM_TIMER_VIRTUAL_PRIO
#define ARM_ARCH_TIMER_FLAGS    ARM_TIMER_VIRTUAL_FLAGS
 
static ALWAYS_INLINE void arm_arch_timer_init(void)
{
#ifdef CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
        extern unsigned int z_clock_hw_cycles_per_sec;
        uint64_t cntfrq_el0 = read_cntfrq_el0();
 
        __ASSERT(cntfrq_el0 < UINT_MAX, "cntfrq_el0 cannot fit in system 'unsigned int'");
        z_clock_hw_cycles_per_sec = (unsigned int) cntfrq_el0;
#endif
}
 
static ALWAYS_INLINE void arm_arch_timer_set_compare(uint64_t val)
{
        write_cntv_cval_el0(val);
}
 
static ALWAYS_INLINE void arm_arch_timer_enable(unsigned char enable)
{
        uint64_t cntv_ctl;
 
        cntv_ctl = read_cntv_ctl_el0();
 
        if (enable) {
                cntv_ctl |= CNTV_CTL_ENABLE_BIT;
        } else {
                cntv_ctl &= ~CNTV_CTL_ENABLE_BIT;
        }
 
        write_cntv_ctl_el0(cntv_ctl);
}
 
static ALWAYS_INLINE void arm_arch_timer_set_irq_mask(bool mask)
{
        uint64_t cntv_ctl;
 
        cntv_ctl = read_cntv_ctl_el0();
 
        if (mask) {
                cntv_ctl |= CNTV_CTL_IMASK_BIT;
        } else {
                cntv_ctl &= ~CNTV_CTL_IMASK_BIT;
        }
 
        write_cntv_ctl_el0(cntv_ctl);
}
 
static ALWAYS_INLINE uint64_t arm_arch_timer_count(void)
{
        return read_cntvct_el0();
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* _ASMLANGUAGE */
 
#endif /* ZEPHYR_INCLUDE_ARCH_ARM64_TIMER_H_ */