e29178eda1
When using us times it makes sense to use 64bit variables for storage. The currently implemented time_after() and friends functions only handle 32bit variables. This patch now includes the 64bit variants as well from Linux. This will be used by the upcoming generic cyclic function infrastructure. These macros were copied from include/linux/jiffies.h of Linux 5.18. Signed-off-by: Stefan Roese <sr@denx.de> Reviewed-by: Simon Glass <sjg@chromium.org>
149 lines
3.9 KiB
C
149 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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#ifndef _TIME_H
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#define _TIME_H
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#include <linux/typecheck.h>
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#include <linux/types.h>
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ulong get_tbclk(void);
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unsigned long get_timer(unsigned long base);
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/*
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* Return the current value of a monotonically increasing microsecond timer.
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* Granularity may be larger than 1us if hardware does not support this.
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*/
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unsigned long timer_get_us(void);
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uint64_t get_timer_us(uint64_t base);
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/**
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* get_timer_us_long() - Get the number of elapsed microseconds
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*
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* This uses 32-bit arithmetic on 32-bit machines, which is enough to handle
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* delays of over an hour. For 64-bit machines it uses a 64-bit value.
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*
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*@base: Base time to consider
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*Return: elapsed time since @base
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*/
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unsigned long get_timer_us_long(unsigned long base);
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/*
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* timer_test_add_offset()
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*
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* Allow tests to add to the time reported through lib/time.c functions
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* offset: number of milliseconds to advance the system time
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*/
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void timer_test_add_offset(unsigned long offset);
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/**
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* usec_to_tick() - convert microseconds to clock ticks
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*
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* @usec: duration in microseconds
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* Return: duration in clock ticks
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*/
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uint64_t usec_to_tick(unsigned long usec);
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/*
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* These inlines deal with timer wrapping correctly. You are
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* strongly encouraged to use them
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* 1. Because people otherwise forget
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* 2. Because if the timer wrap changes in future you won't have to
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* alter your driver code.
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*
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* time_after(a,b) returns true if the time a is after time b.
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*
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* Do this with "<0" and ">=0" to only test the sign of the result. A
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* good compiler would generate better code (and a really good compiler
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* wouldn't care). Gcc is currently neither.
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*/
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#define time_after(a,b) \
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(typecheck(unsigned long, a) && \
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typecheck(unsigned long, b) && \
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((long)((b) - (a)) < 0))
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#define time_before(a,b) time_after(b,a)
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#define time_after_eq(a,b) \
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(typecheck(unsigned long, a) && \
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typecheck(unsigned long, b) && \
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((long)((a) - (b)) >= 0))
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#define time_before_eq(a,b) time_after_eq(b,a)
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/*
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* Calculate whether a is in the range of [b, c].
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*/
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#define time_in_range(a,b,c) \
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(time_after_eq(a,b) && \
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time_before_eq(a,c))
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/*
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* Calculate whether a is in the range of [b, c).
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*/
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#define time_in_range_open(a,b,c) \
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(time_after_eq(a,b) && \
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time_before(a,c))
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/* Same as above, but does so with platform independent 64bit types.
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* These must be used when utilizing jiffies_64 (i.e. return value of
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* get_jiffies_64() */
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#define time_after64(a,b) \
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(typecheck(__u64, a) && \
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typecheck(__u64, b) && \
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((__s64)((b) - (a)) < 0))
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#define time_before64(a,b) time_after64(b,a)
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#define time_after_eq64(a,b) \
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(typecheck(__u64, a) && \
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typecheck(__u64, b) && \
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((__s64)((a) - (b)) >= 0))
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#define time_before_eq64(a,b) time_after_eq64(b,a)
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#define time_in_range64(a, b, c) \
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(time_after_eq64(a, b) && \
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time_before_eq64(a, c))
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/**
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* usec2ticks() - Convert microseconds to internal ticks
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*
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* @usec: Value of microseconds to convert
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* Return: Corresponding internal ticks value, calculated using get_tbclk()
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*/
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ulong usec2ticks(unsigned long usec);
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/**
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* ticks2usec() - Convert internal ticks to microseconds
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*
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* @ticks: Value of ticks to convert
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* Return: Corresponding microseconds value, calculated using get_tbclk()
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*/
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ulong ticks2usec(unsigned long ticks);
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/**
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* wait_ticks() - waits a given number of ticks
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*
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* This is an internal function typically used to implement udelay() and
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* similar. Normally you should use udelay() or mdelay() instead.
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*
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* @ticks: Number of ticks to wait
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*/
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void wait_ticks(unsigned long ticks);
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/**
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* timer_get_us() - Get monotonic microsecond timer
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*
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* Return: value of monotonic microsecond timer
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*/
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unsigned long timer_get_us(void);
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/**
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* get_ticks() - Get the current tick value
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*
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* This is an internal value used by the timer on the system. Ticks increase
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* monotonically at the rate given by get_tbclk().
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*
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* Return: current tick value
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*/
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uint64_t get_ticks(void);
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#endif /* _TIME_H */
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