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kernel/linux-rt-4.4.41/arch/tile/include/asm/delay.h 1.1 KB
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  /*
   * Copyright 2010 Tilera Corporation. All Rights Reserved.
   *
   *   This program is free software; you can redistribute it and/or
   *   modify it under the terms of the GNU General Public License
   *   as published by the Free Software Foundation, version 2.
   *
   *   This program is distributed in the hope that it will be useful, but
   *   WITHOUT ANY WARRANTY; without even the implied warranty of
   *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
   *   NON INFRINGEMENT.  See the GNU General Public License for
   *   more details.
   */
  
  #ifndef _ASM_TILE_DELAY_H
  #define _ASM_TILE_DELAY_H
  
  /* Undefined functions to get compile-time errors. */
  extern void __bad_udelay(void);
  extern void __bad_ndelay(void);
  
  extern void __udelay(unsigned long usecs);
  extern void __ndelay(unsigned long nsecs);
  extern void __delay(unsigned long loops);
  
  #define udelay(n) (__builtin_constant_p(n) ? \
  	((n) > 20000 ? __bad_udelay() : __ndelay((n) * 1000)) : \
  	__udelay(n))
  
  #define ndelay(n) (__builtin_constant_p(n) ? \
  	((n) > 20000 ? __bad_ndelay() : __ndelay(n)) : \
  	__ndelay(n))
  
  #endif /* _ASM_TILE_DELAY_H */