1 /* $NetBSD: clock.c,v 1.1 2011/03/03 05:59:37 kiyohara Exp $ */
2 /*
3 * Copyright (c) 2011 KIYOHARA Takashi
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
24 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <lib/libsa/stand.h>
29
30 #include <sh3/devreg.h>
31 #include <sh3/tmureg.h>
32
33 #include "boot.h"
34
35 void
tmu_init(void)36 tmu_init(void)
37 {
38
39 /* Enable TMU channel 0. */
40 _reg_write_1(SH_(TOCR), TOCR_TCOE);
41 _reg_write_2(SH_(TCR0), TCR_TPSC_P4);
42 _reg_bset_1(SH_(TSTR), TSTR_STR0);
43 }
44
45 void
delay(int n)46 delay(int n)
47 {
48 int t1, t2, x;
49
50 x = n * 11;
51 t1 = _reg_read_4(SH_(TCNT0));
52 while (x > 0) {
53 t2 = _reg_read_4(SH_(TCNT0));
54 if (t2 > t1)
55 x -= (t2 - t1 - 1);
56 else
57 x -= (t1 - t2);
58 t1 = t2;
59 }
60 }
61