LXR linux/arch/ia64/include/asm/delay.h

   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
  22static __inline__ void
  23ia64_set_itm (unsigned long val)
  24{
  25        ia64_setreg(_IA64_REG_CR_ITM, val);
  26        ia64_srlz_d();
  27}
  28
  29static __inline__ unsigned long
  30ia64_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
  39static __inline__ void
  40ia64_set_itv (unsigned long val)
  41{
  42        ia64_setreg(_IA64_REG_CR_ITV, val);
  43        ia64_srlz_d();
  44}
  45
  46static __inline__ unsigned long
  47ia64_get_itv (void)
  48{
  49        return ia64_getreg(_IA64_REG_CR_ITV);
  50}
  51
  52static __inline__ void
  53ia64_set_itc (unsigned long val)
  54{
  55        ia64_setreg(_IA64_REG_AR_ITC, val);
  56        ia64_srlz_d();
  57}
  58
  59static __inline__ unsigned long
  60ia64_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
  75extern void ia64_delay_loop (unsigned long loops);
  76
  77static __inline__ void
  78__delay (unsigned long loops)
  79{
  80        if (unlikely(loops < 1))
  81                return;
  82
  83        ia64_delay_loop (loops - 1);
  84}
  85
  86extern void udelay (unsigned long usecs);
  87
  88#endif /* _ASM_IA64_DELAY_H */
  89