include/asm-sparc64/delay.h

   1 /* $Id: delay.h,v 1.7 1997/11/07 18:24:31 mj Exp $
   2  * delay.h: Linux delay routines on the V9.
   3  *
   4  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu).
   5  */
   6
   7 #ifndef __SPARC64_DELAY_H
   8 #define __SPARC64_DELAY_H
   9
  10 #ifdef __SMP__
  11 #include <asm/smp.h>
  12 #endif
  13
  14 extern __inline__ void __delay(unsigned long loops)
  15 {
  16         __asm__ __volatile__("
  17         b,pt    %%xcc, 1f
  18          cmp    %0, 0
  19         .align  32
  20 1:
  21         bne,pt  %%xcc, 1b
  22          subcc  %0, 1, %0
  23 "       : "=&r" (loops)
  24         : "0" (loops)
  25         : "cc");
  26 }
  27
  28 extern __inline__ void __udelay(unsigned long usecs, unsigned long lps)
  29 {
  30         usecs *= 0x00000000000010c6UL;          /* 2**32 / 1000000 */
  31
  32         __asm__ __volatile__("
  33         mulx    %1, %2, %0
  34         srlx    %0, 32, %0
  35 "       : "=r" (usecs)
  36         : "r" (usecs), "r" (lps));
  37
  38         __delay(usecs);
  39 }
  40
  41 #ifdef __SMP__
  42 #define __udelay_val cpu_data[smp_processor_id()].udelay_val
  43 #else
  44 #define __udelay_val loops_per_sec
  45 #endif
  46
  47 #define udelay(usecs) __udelay((usecs),__udelay_val)
  48
  49 #endif /* defined(__SPARC64_DELAY_H) */