delay.h
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上传日期:2013-02-24
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- #ifndef __ASM_ARM_DELAY_H
- #define __ASM_ARM_DELAY_H
- /*
- * Copyright (C) 1995 Russell King
- *
- * Delay routines, using a pre-computed "loops_per_second" value.
- */
- extern void __delay(int loops);
- /*
- * 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);
- static inline unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c)
- {
- return a * b / c;
- }
-
- #endif /* defined(_ARM_DELAY_H) */