1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* $OpenBSD: delay.c,v 1.1 2006/10/06 21:48:50 mickey Exp $ */
/* $NetBSD: delay.c,v 1.1 2006/09/01 21:26:18 uwe Exp $ */
/*-
* Copyright (c) 2005 NONAKA Kimihiro
* 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 REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <sys/param.h>
#include <libsa.h>
#include <sh/tmureg.h>
#ifndef TICK_CH
#define TICK_CH 0
#endif
#if TICK_CH == 0
#define TSTR SH4_TSTR
#define TCOR SH4_TCOR0
#define TCNT SH4_TCNT0
#define TCR SH4_TCR0
#define TSTR_CH TSTR_STR0
#elif TICK_CH == 1
#define TSTR SH4_TSTR
#define TCOR SH4_TCOR1
#define TCNT SH4_TCNT1
#define TCR SH4_TCR1
#define TSTR_CH TSTR_STR1
#elif TICK_CH == 2
#define TSTR SH4_TSTR
#define TCOR SH4_TCOR2
#define TCNT SH4_TCNT2
#define TCR SH4_TCR2
#define TSTR_CH TSTR_STR2
#elif TICK_CH == 3
#define TSTR SH4_TSTR2
#define TCOR SH4_TCOR3
#define TCNT SH4_TCNT3
#define TCR SH4_TCR3
#define TSTR_CH SH4_TSTR2_STR3
#elif TICK_CH == 4
#define TSTR SH4_TSTR2
#define TCOR SH4_TCOR4
#define TCNT SH4_TCNT4
#define TCR SH4_TCR4
#define TSTR_CH SH4_TSTR2_STR4
#else
#error TICK_CH != [01234]
#endif
#ifndef TICK_PRESC
#define TICK_PRESC 1024
#endif
#if TICK_PRESC == 4
#define TCR_TPSC TCR_TPSC_P4
#elif TICK_PRESC == 16
#define TCR_TPSC TCR_TPSC_P16
#elif TICK_PRESC == 64
#define TCR_TPSC TCR_TPSC_P64
#elif TICK_PRESC == 256
#define TCR_TPSC TCR_TPSC_P256
#elif TICK_PRESC == 1024
#define TCR_TPSC SH4_TCR_TPSC_P1024
#else
#error TICK_PRESC != 4, 16, 64, 256, 1024
#endif
#define TICKS_PER_SEC (PCLOCK / TICK_PRESC)
#define MS_PER_TICK (1000000 / TICKS_PER_SEC)
int
tick_init(void)
{
_reg_bclr_1(TSTR, TSTR_CH);
_reg_write_2(TCR, TCR_TPSC);
_reg_write_4(TCOR, 0xffffffff);
_reg_write_4(TCNT, 0xffffffff);
_reg_bset_1(TSTR, TSTR_CH);
return 0;
}
void
tick_stop(void)
{
_reg_bclr_1(TSTR, TSTR_CH);
}
uint32_t
gettick(void)
{
return ~(_reg_read_4(TCNT));
}
void
delay(int ms)
{
uint32_t base, now;
base = gettick();
for (;;) {
now = gettick();
if (((now - base) / MS_PER_TICK) > ms) {
break;
}
}
}
|
