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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_IA64_DELAY_H
   3#define _ASM_IA64_DELAY_H
   4
   5/*
   6 * Delay routines using a pre-computed "cycles/usec" value.
   7 *
   8 * Copyright (C) 1998, 1999 Hewlett-Packard Co
   9 *      David Mosberger-Tang <davidm@hpl.hp.com>
  10 * Copyright (C) 1999 VA Linux Systems
  11 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
  12 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
  13 * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
  14 */
  15
  16#include <linux/kernel.h>
  17#include <linux/sched.h>
  18#include <linux/compiler.h>
  19
  20#include <asm/intrinsics.h>
  21#include <asm/processor.h>
  22
  23static __inline__ void
  24ia64_set_itm (unsigned long val)
  25{
  26        ia64_setreg(_IA64_REG_CR_ITM, val);
  27        ia64_srlz_d();
  28}
  29
  30static __inline__ unsigned long
  31ia64_get_itm (void)
  32{
  33        unsigned long result;
  34
  35        result = ia64_getreg(_IA64_REG_CR_ITM);
  36        ia64_srlz_d();
  37        return result;
  38}
  39
  40static __inline__ void
  41ia64_set_itv (unsigned long val)
  42{
  43        ia64_setreg(_IA64_REG_CR_ITV, val);
  44        ia64_srlz_d();
  45}
  46
  47static __inline__ unsigned long
  48ia64_get_itv (void)
  49{
  50        return ia64_getreg(_IA64_REG_CR_ITV);
  51}
  52
  53static __inline__ void
  54ia64_set_itc (unsigned long val)
  55{
  56        ia64_setreg(_IA64_REG_AR_ITC, val);
  57        ia64_srlz_d();
  58}
  59
  60static __inline__ unsigned long
  61ia64_get_itc (void)
  62{
  63        unsigned long result;
  64
  65        result = ia64_getreg(_IA64_REG_AR_ITC);
  66        ia64_barrier();
  67#ifdef CONFIG_ITANIUM
  68        while (unlikely((__s32) result == -1)) {
  69                result = ia64_getreg(_IA64_REG_AR_ITC);
  70                ia64_barrier();
  71        }
  72#endif
  73        return result;
  74}
  75
  76extern void ia64_delay_loop (unsigned long loops);
  77
  78static __inline__ void
  79__delay (unsigned long loops)
  80{
  81        if (unlikely(loops < 1))
  82                return;
  83
  84        ia64_delay_loop (loops - 1);
  85}
  86
  87extern void udelay (unsigned long usecs);
  88
  89#endif /* _ASM_IA64_DELAY_H */
  90