LXR linux/arch/sparc/include/asm/delay

   1/*
   2 * delay.h: Linux delay routines on the Sparc.
   3 *
   4 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu).
   5 */
   6
   7#ifndef __SPARC_DELAY_H
   8#define __SPARC_DELAY_H
   9
  10#include <asm/cpudata.h>
  11
  12static inline void __delay(unsigned long loops)
  13{
  14        __asm__ __volatile__("cmp %0, 0\n\t"
  15                             "1: bne 1b\n\t"
  16                             "subcc %0, 1, %0\n" :
  17                             "=&r" (loops) :
  18                             "0" (loops) :
  19                             "cc");
  20}
  21
  22/* This is too messy with inline asm on the Sparc. */
  23extern void __udelay(unsigned long usecs, unsigned long lpj);
  24extern void __ndelay(unsigned long nsecs, unsigned long lpj);
  25
  26#ifdef CONFIG_SMP
  27#define __udelay_val    cpu_data(smp_processor_id()).udelay_val
  28#else /* SMP */
  29#define __udelay_val    loops_per_jiffy
  30#endif /* SMP */
  31#define udelay(__usecs) __udelay(__usecs, __udelay_val)
  32#define ndelay(__nsecs) __ndelay(__nsecs, __udelay_val)
  33
  34#endif /* defined(__SPARC_DELAY_H) */
  35