e1ddf67cb3
The current get_timer_us() uses 64-bit arithmetic on 32-bit machines. When implementing microsecond-level timeouts, 32-bits is plenty. Add a new function that uses an unsigned long. On 64-bit machines this is still 64-bit, but this doesn't introduce a penalty. On 32-bit machines it is more efficient. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
130 lines
3.3 KiB
C
130 lines
3.3 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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/**
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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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