61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/* $NetBSD: clock.c,v 1.1 2011/03/03 05:59:37 kiyohara Exp $ */
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/*
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* Copyright (c) 2011 KIYOHARA Takashi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <lib/libsa/stand.h>
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#include <sh3/devreg.h>
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#include <sh3/tmureg.h>
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#include "boot.h"
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void
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tmu_init(void)
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{
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/* Enable TMU channel 0. */
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_reg_write_1(SH_(TOCR), TOCR_TCOE);
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_reg_write_2(SH_(TCR0), TCR_TPSC_P4);
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_reg_bset_1(SH_(TSTR), TSTR_STR0);
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}
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void
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delay(int n)
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{
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int t1, t2, x;
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x = n * 11;
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t1 = _reg_read_4(SH_(TCNT0));
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while (x > 0) {
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t2 = _reg_read_4(SH_(TCNT0));
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if (t2 > t1)
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x -= (t2 - t1 - 1);
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else
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x -= (t1 - t2);
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t1 = t2;
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}
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}
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