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include/asm-arm26/delay.h 820 Bytes
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
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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)
   *
   * FIXME - lets improve it then...
   */
  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) */