https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: d8ec26d7f8287f5788a494f56e8814210f0e64be authored by Linus Torvalds on 20 January 2014, 02:40:07 UTC
Linux 3.13
Linux 3.13
Tip revision: d8ec26d
delay.h
/*
* Copyright (C) 1995-2004 Russell King
*
* Delay routines, using a pre-computed "loops_per_second" value.
*/
#ifndef __ASM_ARM_DELAY_H
#define __ASM_ARM_DELAY_H
#include <asm/memory.h>
#include <asm/param.h> /* HZ */
#define MAX_UDELAY_MS 2
#define UDELAY_MULT ((UL(2199023) * HZ) >> 11)
#define UDELAY_SHIFT 30
#ifndef __ASSEMBLY__
struct delay_timer {
unsigned long (*read_current_timer)(void);
unsigned long freq;
};
extern struct arm_delay_ops {
void (*delay)(unsigned long);
void (*const_udelay)(unsigned long);
void (*udelay)(unsigned long);
unsigned long ticks_per_jiffy;
} arm_delay_ops;
#define __delay(n) arm_delay_ops.delay(n)
/*
* This function intentionally does not exist; if you see references to
* it, it means that you're calling udelay() with an out of range value.
*
* With currently imposed limits, this means that we support a max delay
* of 2000us. Further limits: HZ<=1000 and bogomips<=3355
*/
extern void __bad_udelay(void);
/*
* division by multiplication: you don't have to worry about
* loss of precision.
*
* Use only for very small delays ( < 2 msec). Should probably use a
* lookup table, really, as the multiplications take much too long with
* short delays. This is a "reasonable" implementation, though (and the
* first constant multiplications gets optimized away if the delay is
* a constant)
*/
#define __udelay(n) arm_delay_ops.udelay(n)
#define __const_udelay(n) arm_delay_ops.const_udelay(n)
#define udelay(n) \
(__builtin_constant_p(n) ? \
((n) > (MAX_UDELAY_MS * 1000) ? __bad_udelay() : \
__const_udelay((n) * UDELAY_MULT)) : \
__udelay(n))
/* Loop-based definitions for assembly code. */
extern void __loop_delay(unsigned long loops);
extern void __loop_udelay(unsigned long usecs);
extern void __loop_const_udelay(unsigned long);
/* Delay-loop timer registration. */
#define ARCH_HAS_READ_CURRENT_TIMER
extern void register_current_timer_delay(const struct delay_timer *timer);
#endif /* __ASSEMBLY__ */
#endif /* defined(_ARM_DELAY_H) */