u-boot/include/time.h
Marek Vasut 80e7e7c2ab lib: time: Add microsecond timer
Add get_timer_us(), which is useful e.g. when we need higher
precision timestamps.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>
[trini: Fixup arch/arm/mach-bcm283x/include/mach/timer.h]
Signed-off-by: Tom Rini <trini@konsulko.com>
2019-10-31 07:22:53 -04:00

73 lines
1.9 KiB
C

/* SPDX-License-Identifier: GPL-2.0+ */
#ifndef _TIME_H
#define _TIME_H
#include <linux/typecheck.h>
#include <linux/types.h>
unsigned long get_timer(unsigned long base);
/*
* Return the current value of a monotonically increasing microsecond timer.
* Granularity may be larger than 1us if hardware does not support this.
*/
unsigned long timer_get_us(void);
uint64_t get_timer_us(uint64_t base);
/*
* timer_test_add_offset()
*
* Allow tests to add to the time reported through lib/time.c functions
* offset: number of milliseconds to advance the system time
*/
void timer_test_add_offset(unsigned long offset);
/**
* usec_to_tick() - convert microseconds to clock ticks
*
* @usec: duration in microseconds
* Return: duration in clock ticks
*/
uint64_t usec_to_tick(unsigned long usec);
/*
* These inlines deal with timer wrapping correctly. You are
* strongly encouraged to use them
* 1. Because people otherwise forget
* 2. Because if the timer wrap changes in future you won't have to
* alter your driver code.
*
* time_after(a,b) returns true if the time a is after time b.
*
* Do this with "<0" and ">=0" to only test the sign of the result. A
* good compiler would generate better code (and a really good compiler
* wouldn't care). Gcc is currently neither.
*/
#define time_after(a,b) \
(typecheck(unsigned long, a) && \
typecheck(unsigned long, b) && \
((long)((b) - (a)) < 0))
#define time_before(a,b) time_after(b,a)
#define time_after_eq(a,b) \
(typecheck(unsigned long, a) && \
typecheck(unsigned long, b) && \
((long)((a) - (b)) >= 0))
#define time_before_eq(a,b) time_after_eq(b,a)
/*
* Calculate whether a is in the range of [b, c].
*/
#define time_in_range(a,b,c) \
(time_after_eq(a,b) && \
time_before_eq(a,c))
/*
* Calculate whether a is in the range of [b, c).
*/
#define time_in_range_open(a,b,c) \
(time_after_eq(a,b) && \
time_before(a,c))
#endif /* _TIME_H */