release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/include/asm/delay.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1994 by Waldorf Electronics
   7  * Copyright (C) 1995 - 2000, 01, 03 by Ralf Baechle
   8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   9  * Copyright (C) 2007  Maciej W. Rozycki
  10  */
  11 #ifndef _ASM_DELAY_H
  12 #define _ASM_DELAY_H
  13
  14 #include <linux/param.h>
  15
  16 extern void __delay(unsigned int loops);
  17 extern void __ndelay(unsigned int ns);
  18 extern void __udelay(unsigned int us);
  19
  20 #define ndelay(ns) __ndelay(ns)
  21 #define udelay(us) __udelay(us)
  22
  23 /* make sure "usecs *= ..." in udelay do not overflow. */
  24 #if HZ >= 1000
  25 #define MAX_UDELAY_MS   1
  26 #elif HZ <= 200
  27 #define MAX_UDELAY_MS   5
  28 #else
  29 #define MAX_UDELAY_MS   (1000 / HZ)
  30 #endif
  31
  32 #endif /* _ASM_DELAY_H */