LXR linux/arch/metag/include/asm/delay.h

   1#ifndef _METAG_DELAY_H
   2#define _METAG_DELAY_H
   3
   4/*
   5 * Copyright (C) 1993 Linus Torvalds
   6 *
   7 * Delay routines calling functions in arch/metag/lib/delay.c
   8 */
   9
  10/* Undefined functions to get compile-time errors */
  11extern void __bad_udelay(void);
  12extern void __bad_ndelay(void);
  13
  14extern void __udelay(unsigned long usecs);
  15extern void __ndelay(unsigned long nsecs);
  16extern void __const_udelay(unsigned long xloops);
  17extern void __delay(unsigned long loops);
  18
  19/* 0x10c7 is 2**32 / 1000000 (rounded up) */
  20#define udelay(n) (__builtin_constant_p(n) ? \
  21        ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
  22        __udelay(n))
  23
  24/* 0x5 is 2**32 / 1000000000 (rounded up) */
  25#define ndelay(n) (__builtin_constant_p(n) ? \
  26        ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
  27        __ndelay(n))
  28
  29#endif /* _METAG_DELAY_H */
  30