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
|
/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
*
* 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. 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 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 AUTHOR 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 <libpayload.h>
#define IOBASE lib_sysinfo.ser_ioport
#ifdef CONFIG_SERIAL_SET_SPEED
#define DIVISOR (115200 / CONFIG_SERIAL_BAUD_RATE)
#endif
void serial_init(void)
{
#ifdef CONFIG_SERIAL_SET_SPEED
unsigned char reg;
/* Disable interrupts. */
outb(0, IOBASE + 0x01);
/* Assert RTS and DTR. */
outb(3, IOBASE + 0x04);
/* Set the divisor latch. */
reg = inb(IOBASE + 0x03);
outb(reg | 0x80, IOBASE + 0x03);
/* Write the divisor. */
outb(DIVISOR & 0xFF, IOBASE);
outb(DIVISOR >> 8 & 0xFF, IOBASE + 1);
/* Restore the previous value of the divisor. */
outb(reg &= ~0x80, IOBASE + 0x03);
#endif
}
void serial_putchar(unsigned char c)
{
while ((inb(IOBASE + 0x05) & 0x20) == 0) ;
outb(c, IOBASE);
}
int serial_havechar(void)
{
return inb(IOBASE + 0x05) & 0x01;
}
int serial_getchar(void)
{
while (!serial_havechar()) ;
return (int)inb(IOBASE);
}
|
