release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sparc/include/asm/delay_32.h

   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
  12 static 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. */
  23 extern void __udelay(unsigned long usecs, unsigned long lpj);
  24 extern 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) */