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   1 #ifndef _ASM_IA64_DELAY_H
   2 #define _ASM_IA64_DELAY_H
   3
   4 /*
   5  * Delay routines using a pre-computed "cycles/usec" value.
   6  *
   7  * Copyright (C) 1998, 1999 Hewlett-Packard Co
   8  *      David Mosberger-Tang <davidm@hpl.hp.com>
   9  * Copyright (C) 1999 VA Linux Systems
  10  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
  11  * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
  12  * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/sched.h>
  17 #include <linux/compiler.h>
  18
  19 #include <asm/intrinsics.h>
  20 #include <asm/processor.h>
  21
  22 static __inline__ void
  23 ia64_set_itm (unsigned long val)
  24 {
  25         ia64_setreg(_IA64_REG_CR_ITM, val);
  26         ia64_srlz_d();
  27 }
  28
  29 static __inline__ unsigned long
  30 ia64_get_itm (void)
  31 {
  32         unsigned long result;
  33
  34         result = ia64_getreg(_IA64_REG_CR_ITM);
  35         ia64_srlz_d();
  36         return result;
  37 }
  38
  39 static __inline__ void
  40 ia64_set_itv (unsigned long val)
  41 {
  42         ia64_setreg(_IA64_REG_CR_ITV, val);
  43         ia64_srlz_d();
  44 }
  45
  46 static __inline__ unsigned long
  47 ia64_get_itv (void)
  48 {
  49         return ia64_getreg(_IA64_REG_CR_ITV);
  50 }
  51
  52 static __inline__ void
  53 ia64_set_itc (unsigned long val)
  54 {
  55         ia64_setreg(_IA64_REG_AR_ITC, val);
  56         ia64_srlz_d();
  57 }
  58
  59 static __inline__ unsigned long
  60 ia64_get_itc (void)
  61 {
  62         unsigned long result;
  63
  64         result = ia64_getreg(_IA64_REG_AR_ITC);
  65         ia64_barrier();
  66 #ifdef CONFIG_ITANIUM
  67         while (unlikely((__s32) result == -1)) {
  68                 result = ia64_getreg(_IA64_REG_AR_ITC);
  69                 ia64_barrier();
  70         }
  71 #endif
  72         return result;
  73 }
  74
  75 extern void ia64_delay_loop (unsigned long loops);
  76
  77 static __inline__ void
  78 __delay (unsigned long loops)
  79 {
  80         if (unlikely(loops < 1))
  81                 return;
  82
  83         ia64_delay_loop (loops - 1);
  84 }
  85
  86 extern void udelay (unsigned long usecs);
  87
  88 #endif /* _ASM_IA64_DELAY_H */