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