mirror of
https://github.com/riscv-software-src/opensbi
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9d0ab35ab4
We now have frequency of the timer device provided by the platform support so we can emulate desired delay using a loop where the number loop iterations are based on timer frequency. This patch provides sbi_timer_delay_loop() for above purpose. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Xiang W <wxjstz@126.com>
85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#ifndef __SBI_TIMER_H__
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#define __SBI_TIMER_H__
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#include <sbi/sbi_types.h>
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/** Timer hardware device */
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struct sbi_timer_device {
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/** Name of the timer operations */
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char name[32];
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/** Frequency of timer in HZ */
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unsigned long timer_freq;
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/** Get free-running timer value */
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u64 (*timer_value)(void);
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/** Start timer event for current HART */
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void (*timer_event_start)(u64 next_event);
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/** Stop timer event for current HART */
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void (*timer_event_stop)(void);
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};
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struct sbi_scratch;
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/** Generic delay loop of desired granularity */
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void sbi_timer_delay_loop(ulong units, u64 unit_freq,
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void (*delay_fn)(void *), void *opaque);
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/** Provide delay in terms of milliseconds */
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static inline void sbi_timer_mdelay(ulong msecs)
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{
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sbi_timer_delay_loop(msecs, 1000, NULL, NULL);
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}
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/** Provide delay in terms of microseconds */
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static inline void sbi_timer_udelay(ulong usecs)
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{
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sbi_timer_delay_loop(usecs, 1000000, NULL, NULL);
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}
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/** Get timer value for current HART */
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u64 sbi_timer_value(void);
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/** Get virtualized timer value for current HART */
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u64 sbi_timer_virt_value(void);
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/** Get timer delta value for current HART */
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u64 sbi_timer_get_delta(void);
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/** Set timer delta value for current HART */
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void sbi_timer_set_delta(ulong delta);
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/** Set upper 32-bits of timer delta value for current HART */
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void sbi_timer_set_delta_upper(ulong delta_upper);
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/** Start timer event for current HART */
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void sbi_timer_event_start(u64 next_event);
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/** Process timer event for current HART */
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void sbi_timer_process(void);
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/** Get current timer device */
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const struct sbi_timer_device *sbi_timer_get_device(void);
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/** Register timer device */
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void sbi_timer_set_device(const struct sbi_timer_device *dev);
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/* Initialize timer */
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int sbi_timer_init(struct sbi_scratch *scratch, bool cold_boot);
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/* Exit timer */
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void sbi_timer_exit(struct sbi_scratch *scratch);
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#endif
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