include/asm-sparc/delay.h

   1 /* $Id: delay.h,v 1.11 2001/01/01 01:46:15 davem Exp $
   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 <linux/config.h>
  11 #include <asm/cpudata.h>
  12
  13 static 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. */
  24 extern void __udelay(unsigned long usecs, unsigned long lpj);
  25 extern void __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) */