[people/ms/u-boot.git] / include / time.h

/*
 * SPDX-License-Identifier:	GPL-2.0+
 */

#ifndef _TIME_H
#define _TIME_H

#include <linux/typecheck.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);

/*
 *	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 */
Commit	Line	Data
a7b81769 MY	1	/*
	2	* SPDX-License-Identifier: GPL-2.0+
	3	*/
	4
	5	#ifndef _TIME_H
	6	#define _TIME_H
	7
21cdd133 MY	8	#include <linux/typecheck.h>
21cdd133 MY	9
a7b81769 MY	10	unsigned long get_timer(unsigned long base);
	11
	12	/*
	13	* Return the current value of a monotonically increasing microsecond timer.
	14	* Granularity may be larger than 1us if hardware does not support this.
	15	*/
	16	unsigned long timer_get_us(void);
	17
21cdd133 MY	18	/*
	19	* These inlines deal with timer wrapping correctly. You are
	20	* strongly encouraged to use them
	21	* 1. Because people otherwise forget
	22	* 2. Because if the timer wrap changes in future you won't have to
	23	* alter your driver code.
	24	*
	25	* time_after(a,b) returns true if the time a is after time b.
	26	*
	27	* Do this with "<0" and ">=0" to only test the sign of the result. A
	28	* good compiler would generate better code (and a really good compiler
	29	* wouldn't care). Gcc is currently neither.
	30	*/
	31	#define time_after(a,b) \
	32	(typecheck(unsigned long, a) && \
	33	typecheck(unsigned long, b) && \
	34	((long)((b) - (a)) < 0))
	35	#define time_before(a,b) time_after(b,a)
	36
	37	#define time_after_eq(a,b) \
	38	(typecheck(unsigned long, a) && \
	39	typecheck(unsigned long, b) && \
	40	((long)((a) - (b)) >= 0))
	41	#define time_before_eq(a,b) time_after_eq(b,a)
	42
	43	/*
	44	* Calculate whether a is in the range of [b, c].
	45	*/
	46	#define time_in_range(a,b,c) \
	47	(time_after_eq(a,b) && \
	48	time_before_eq(a,c))
	49
	50	/*
	51	* Calculate whether a is in the range of [b, c).
	52	*/
	53	#define time_in_range_open(a,b,c) \
	54	(time_after_eq(a,b) && \
	55	time_before(a,c))
	56
a7b81769	57	#endif /* _TIME_H */