include/asm-arm26/delay.h

   1 #ifndef __ASM_ARM_DELAY_H
   2 #define __ASM_ARM_DELAY_H
   3
   4 /*
   5  * Copyright (C) 1995 Russell King
   6  *
   7  * Delay routines, using a pre-computed "loops_per_second" value.
   8  */
   9
  10 extern void __delay(int loops);
  11
  12 /*
  13  * division by multiplication: you don't have to worry about
  14  * loss of precision.
  15  *
  16  * Use only for very small delays ( < 1 msec).  Should probably use a
  17  * lookup table, really, as the multiplications take much too long with
  18  * short delays.  This is a "reasonable" implementation, though (and the
  19  * first constant multiplications gets optimized away if the delay is
  20  * a constant)
  21  *
  22  * FIXME - lets improve it then...
  23  */
  24 extern void udelay(unsigned long usecs);
  25
  26 static inline unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c)
  27 {
  28         return a * b / c;
  29 }
  30
  31
  32
  33 #endif /* defined(_ARM_DELAY_H) */
  34