/*
   * arch/sh/lib64/udelay.c
   *
   * Delay routines, using a pre-computed "loops_per_jiffy" value.
   *
   * Copyright (C) 2000, 2001  Paolo Alberelli
   * Copyright (C) 2003, 2004  Paul Mundt
   *
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file "COPYING" in the main directory of this archive
   * for more details.
   */
  #include <linux/sched.h>
  #include <asm/param.h>
  
  /*
   * Use only for very small delays (< 1 msec).
   *
   * The active part of our cycle counter is only 32-bits wide, and
   * we're treating the difference between two marks as signed.  On
   * a 1GHz box, that's about 2 seconds.
   */
  
  void __delay(unsigned long loops)
  {
  	long long dummy;
  	__asm__ __volatile__("gettr	tr0, %1
  \t"
  			     "pta	$+4, tr0
  \t"
  			     "addi	%0, -1, %0
  \t"
  			     "bne	%0, r63, tr0
  \t"
  			     "ptabs	%1, tr0
  \t":"=r"(loops),
  			     "=r"(dummy)
  			     :"0"(loops));
  }
  
  void __const_udelay(unsigned long xloops)
  {
  	__delay(xloops * (HZ * cpu_data[raw_smp_processor_id()].loops_per_jiffy));
  }
  
  void __udelay(unsigned long usecs)
  {
  	__const_udelay(usecs * 0x000010c6);  /* 2**32 / 1000000 */
  }
  
  void __ndelay(unsigned long nsecs)
  {
  	__const_udelay(nsecs * 0x00000005);
  }