/*      $NetBSD: clock.c,v 1.1 2011/03/03 05:59:37 kiyohara Exp $       */
/*
* Copyright (c) 2011 KIYOHARA Takashi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <lib/libsa/stand.h>

#include <sh3/devreg.h>
#include <sh3/tmureg.h>

#include "boot.h"

void
tmu_init(void)
{

       /* Enable TMU channel 0. */
       _reg_write_1(SH_(TOCR), TOCR_TCOE);
       _reg_write_2(SH_(TCR0), TCR_TPSC_P4);
       _reg_bset_1(SH_(TSTR), TSTR_STR0);
}

void
delay(int n)
{
       int t1, t2, x;

       x = n * 11;
       t1 = _reg_read_4(SH_(TCNT0));
       while (x > 0) {
               t2 = _reg_read_4(SH_(TCNT0));
               if (t2 > t1)
                       x -= (t2 - t1 - 1);
               else
                       x -= (t1 - t2);
               t1 = t2;
       }
}