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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/* $NetBSD: com.c,v 1.1 2011/03/03 05:59:37 kiyohara Exp $ */
/*-
* Copyright (c) 2008 Izumi Tsutsui. 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.
*/
/*-
* Copyright (c) 1993, 1994, 1995, 1996, 1997
* Charles M. Hannum. All rights reserved.
*
* Interrupt processing and hardware flow control partly based on code from
* Onno van der Linden and Gordon Ross.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles M. Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
/*
* Copyright (c) 1991 The Regents of the University of California.
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*
* @(#)com.c 7.5 (Berkeley) 5/16/91
*/
#ifdef CONS_COM
#include <lib/libsa/stand.h>
#include <lib/libkern/libkern.h>
#include <dev/ic/comreg.h>
#include <machine/cpu.h>
#include "boot.h"
#include "ns16550.h"
#define CSR_READ(base, reg) (*(volatile uint8_t *)((base) + (reg)))
#define CSR_WRITE(base, reg, val) \
do { \
*(volatile uint8_t *)((base) + (reg)) = (val); \
} while (/* CONSTCOND */ 0)
#define COM_FREQ 1843200 /* 16-bit baud rate divisor */
#define COM_TOLERANCE 30 /* baud rate tolerance, in 0.1% units */
static int comspeed(long);
static int
comspeed(long speed)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
long frequency = COM_FREQ * 10;
if (speed <= 0)
return -1;
x = divrnd((frequency / 16), speed);
if (x <= 0)
return -1;
err = divrnd(((quad_t)frequency) * 1000 / 16, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > COM_TOLERANCE)
return -1;
return x;
#undef divrnd
}
void *
com_init(int addr, int speed)
{
uint8_t *com_port;
com_port = (void *)addr;
CSR_WRITE(com_port, com_lctl, LCR_DLAB);
speed = comspeed(speed);
CSR_WRITE(com_port, com_dlbl, speed);
CSR_WRITE(com_port, com_dlbh, speed >> 8);
CSR_WRITE(com_port, com_lctl, LCR_PNONE | LCR_8BITS);
CSR_WRITE(com_port, com_mcr, MCR_RTS | MCR_DTR);
CSR_WRITE(com_port, com_fifo,
FIFO_XMT_RST | FIFO_RCV_RST | FIFO_ENABLE);
CSR_WRITE(com_port, com_ier, 0);
return com_port;
}
void
com_putc(void *dev, int c)
{
volatile uint8_t *com_port = dev;
while ((CSR_READ(com_port, com_lsr) & LSR_TXRDY) == 0)
;
CSR_WRITE(com_port, com_data, c);
}
int
com_getc(void *dev)
{
volatile uint8_t *com_port = dev;
while ((CSR_READ(com_port, com_lsr) & LSR_RXRDY) == 0)
;
return CSR_READ(com_port, com_data);
}
int
com_scankbd(void *dev)
{
volatile uint8_t *com_port = dev;
if ((CSR_READ(com_port, com_lsr) & LSR_RXRDY) == 0)
return -1;
return CSR_READ(com_port, com_data);
}
#endif /* CONS_SERIAL */
|