include/asm-sparc64/delay.h

   1 /* $Id: delay.h,v 1.9 2000/05/09 17:40:15 davem 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 #include <linux/config.h>
  11 #ifdef CONFIG_SMP
  12 #include <linux/sched.h>
  13 #include <asm/smp.h>
  14 #endif
  15
  16 extern __inline__ void __delay(unsigned long loops)
  17 {
  18         __asm__ __volatile__("
  19         b,pt    %%xcc, 1f
  20          cmp    %0, 0
  21         .align  32
  22 1:
  23         bne,pt  %%xcc, 1b
  24          subcc  %0, 1, %0
  25 "       : "=&r" (loops)
  26         : "0" (loops)
  27         : "cc");
  28 }
  29
  30 extern __inline__ void __udelay(unsigned long usecs, unsigned long lps)
  31 {
  32         usecs *= 0x00000000000010c6UL;          /* 2**32 / 1000000 */
  33
  34         __asm__ __volatile__("
  35         mulx    %1, %2, %0
  36         srlx    %0, 32, %0
  37 "       : "=r" (usecs)
  38         : "r" (usecs), "r" (lps));
  39
  40         __delay(usecs);
  41 }
  42
  43 #ifdef CONFIG_SMP
  44 #define __udelay_val cpu_data[smp_processor_id()].udelay_val
  45 #else
  46 #define __udelay_val loops_per_sec
  47 #endif
  48
  49 #define udelay(usecs) __udelay((usecs),__udelay_val)
  50
  51 #endif /* defined(__SPARC64_DELAY_H) */