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* Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2019, Linaro Limited
* SPDX-License-Identifier: BSD-3-Clause
#include <stdbool.h>
#include <stdint.h>
#include <arch_helpers.h>
* A simple timer driver providing synchronous delay functionality.
* The driver must be initialized with a structure that provides a
* function pointer to return the timer value and a clock
* multiplier/divider. The ratio of the multiplier and the divider is
* the clock period in microseconds.
typedef struct timer_ops {
uint32_t (*get_timer_value)(void);
uint32_t clk_mult;
uint32_t clk_div;
} timer_ops_t;
static inline uint64_t timeout_cnt_us2cnt(uint32_t us)
return ((uint64_t)us * (uint64_t)read_cntfrq_el0()) / 1000000ULL;
static inline uint64_t timeout_init_us(uint32_t us)
uint64_t cnt = timeout_cnt_us2cnt(us);
cnt += read_cntfrq_el0();
return cnt;
static inline bool timeout_elapsed(uint64_t expire_cnt)
return read_cntpct_el0() > expire_cnt;
void mdelay(uint32_t msec);
void udelay(uint32_t usec);
void timer_init(const timer_ops_t *ops_ptr);
#endif /* DELAY_TIMER_H */