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Current File : /lib/modules/3.13.0-170-generic/build/arch/unicore32/include/asm/delay.h
/*
 * linux/arch/unicore32/include/asm/delay.h
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 * Copyright (C) 2001-2010 GUAN Xue-tao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Delay routines, using a pre-computed "loops_per_second" value.
 */
#ifndef __UNICORE_DELAY_H__
#define __UNICORE_DELAY_H__

#include <asm/param.h>	/* HZ */

extern void __delay(int loops);

/*
 * 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 ( < 1 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)
 */
extern void __udelay(unsigned long usecs);
extern void __const_udelay(unsigned long);

#define MAX_UDELAY_MS 2

#define udelay(n)							\
	(__builtin_constant_p(n) ?					\
	  ((n) > (MAX_UDELAY_MS * 1000) ? __bad_udelay() :		\
			__const_udelay((n) * ((2199023U*HZ)>>11))) :	\
	  __udelay(n))

#endif /* __UNICORE_DELAY_H__ */

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