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
|
/*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <common.h>
#include <asm/arch/ixp425.h>
/*
* 14.7456 MHz
* Baud Rate = --------------
* 16 x Divisor
*/
#define SERIAL_CLOCK 921600
DECLARE_GLOBAL_DATA_PTR;
void serial_setbrg (void)
{
unsigned int quot = 0;
int uart = CFG_IXP425_CONSOLE;
if ((gd->baudrate <= SERIAL_CLOCK) && (SERIAL_CLOCK % gd->baudrate == 0))
quot = SERIAL_CLOCK / gd->baudrate;
else
hang ();
IER(uart) = 0; /* Disable for now */
FCR(uart) = 0; /* No fifos enabled */
/* set baud rate */
LCR(uart) = LCR_WLS0 | LCR_WLS1 | LCR_DLAB;
DLL(uart) = quot & 0xff;
DLH(uart) = quot >> 8;
LCR(uart) = LCR_WLS0 | LCR_WLS1;
#ifdef CONFIG_SERIAL_RTS_ACTIVE
MCR(uart) = MCR_RTS; /* set RTS active */
#else
MCR(uart) = 0; /* set RTS inactive */
#endif
IER(uart) = IER_UUE;
}
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*
*/
int serial_init (void)
{
serial_setbrg ();
return (0);
}
/*
* Output a single byte to the serial port.
*/
void serial_putc (const char c)
{
/* wait for room in the tx FIFO on UART */
while ((LSR(CFG_IXP425_CONSOLE) & LSR_TEMT) == 0);
THR(CFG_IXP425_CONSOLE) = c;
/* If \n, also do \r */
if (c == '\n')
serial_putc ('\r');
}
/*
* Read a single byte from the serial port. Returns 1 on success, 0
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
int serial_tstc (void)
{
return LSR(CFG_IXP425_CONSOLE) & LSR_DR;
}
/*
* Read a single byte from the serial port. Returns 1 on success, 0
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
int serial_getc (void)
{
while (!(LSR(CFG_IXP425_CONSOLE) & LSR_DR));
return (char) RBR(CFG_IXP425_CONSOLE) & 0xff;
}
void
serial_puts (const char *s)
{
while (*s) {
serial_putc (*s++);
}
}
|
