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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * delay.h: Linux delay routines on the Sparc.
   4 *
   5 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu).
   6 */
   7
   8#ifndef __SPARC_DELAY_H
   9#define __SPARC_DELAY_H
  10
  11#include <asm/cpudata.h>
  12
  13static inline void __delay(unsigned long loops)
  14{
  15        __asm__ __volatile__("cmp %0, 0\n\t"
  16                             "1: bne 1b\n\t"
  17                             "subcc %0, 1, %0\n" :
  18                             "=&r" (loops) :
  19                             "0" (loops) :
  20                             "cc");
  21}
  22
  23/* This is too messy with inline asm on the Sparc. */
  24void __udelay(unsigned long usecs, unsigned long lpj);
  25void __ndelay(unsigned long nsecs, unsigned long lpj);
  26
  27#ifdef CONFIG_SMP
  28#define __udelay_val    cpu_data(smp_processor_id()).udelay_val
  29#else /* SMP */
  30#define __udelay_val    loops_per_jiffy
  31#endif /* SMP */
  32#define udelay(__usecs) __udelay(__usecs, __udelay_val)
  33#define ndelay(__nsecs) __ndelay(__nsecs, __udelay_val)
  34
  35#endif /* defined(__SPARC_DELAY_H) */
  36