arch/tile/include/asm/delay.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_DELAY_H
  16 #define _ASM_TILE_DELAY_H
  17
  18 /* Undefined functions to get compile-time errors. */
  19 extern void __bad_udelay(void);
  20 extern void __bad_ndelay(void);
  21
  22 extern void __udelay(unsigned long usecs);
  23 extern void __ndelay(unsigned long nsecs);
  24 extern void __delay(unsigned long loops);
  25
  26 #define udelay(n) (__builtin_constant_p(n) ? \
  27         ((n) > 20000 ? __bad_udelay() : __ndelay((n) * 1000)) : \
  28         __udelay(n))
  29
  30 #define ndelay(n) (__builtin_constant_p(n) ? \
  31         ((n) > 20000 ? __bad_ndelay() : __ndelay(n)) : \
  32         __ndelay(n))
  33
  34 #endif /* _ASM_TILE_DELAY_H */