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wdenk2d5b5612003-10-14 19:43:55 +00001/*
2 * (C) Copyright 2002
3 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
4 *
5 * (C) Copyright 2002
6 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7 * Marius Groeger <mgroeger@sysgo.de>
8 *
9 * (C) Copyright 2002
10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
11 * Alex Zuepke <azu@sysgo.de>
12 *
13 * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 *
29 */
30
31#include <common.h>
32#include <asm/arch/ixp425.h>
33
Jean-Christophe PLAGNIOL-VILLARD7b74ebe2007-12-08 16:34:08 +010034/*
35 * 14.7456 MHz
36 * Baud Rate = --------------
37 * 16 x Divisor
38 */
Wolfgang Denk07eb0262008-01-09 13:43:38 +010039#define SERIAL_CLOCK 921600
Jean-Christophe PLAGNIOL-VILLARD7b74ebe2007-12-08 16:34:08 +010040
Wolfgang Denkd87080b2006-03-31 18:32:53 +020041DECLARE_GLOBAL_DATA_PTR;
42
wdenk2d5b5612003-10-14 19:43:55 +000043void serial_setbrg (void)
44{
wdenk2d5b5612003-10-14 19:43:55 +000045 unsigned int quot = 0;
46 int uart = CFG_IXP425_CONSOLE;
Wolfgang Denk07eb0262008-01-09 13:43:38 +010047
Jean-Christophe PLAGNIOL-VILLARD7b74ebe2007-12-08 16:34:08 +010048 if ((gd->baudrate <= SERIAL_CLOCK) && (SERIAL_CLOCK % gd->baudrate == 0))
49 quot = SERIAL_CLOCK / gd->baudrate;
wdenk2d5b5612003-10-14 19:43:55 +000050 else
51 hang ();
52
53 IER(uart) = 0; /* Disable for now */
54 FCR(uart) = 0; /* No fifos enabled */
55
56 /* set baud rate */
57 LCR(uart) = LCR_WLS0 | LCR_WLS1 | LCR_DLAB;
58 DLL(uart) = quot & 0xff;
59 DLH(uart) = quot >> 8;
60 LCR(uart) = LCR_WLS0 | LCR_WLS1;
Michael Schwingen96bd4622008-01-10 14:59:46 +010061#ifdef CONFIG_SERIAL_RTS_ACTIVE
62 MCR(uart) = MCR_RTS; /* set RTS active */
63#else
64 MCR(uart) = 0; /* set RTS inactive */
65#endif
wdenk2d5b5612003-10-14 19:43:55 +000066 IER(uart) = IER_UUE;
67}
68
wdenk2d5b5612003-10-14 19:43:55 +000069/*
70 * Initialise the serial port with the given baudrate. The settings
71 * are always 8 data bits, no parity, 1 stop bit, no start bits.
72 *
73 */
74int serial_init (void)
75{
76 serial_setbrg ();
77
78 return (0);
79}
80
81
82/*
83 * Output a single byte to the serial port.
84 */
85void serial_putc (const char c)
86{
87 /* wait for room in the tx FIFO on UART */
88 while ((LSR(CFG_IXP425_CONSOLE) & LSR_TEMT) == 0);
89
90 THR(CFG_IXP425_CONSOLE) = c;
91
92 /* If \n, also do \r */
93 if (c == '\n')
94 serial_putc ('\r');
95}
96
97/*
98 * Read a single byte from the serial port. Returns 1 on success, 0
99 * otherwise. When the function is succesfull, the character read is
100 * written into its argument c.
101 */
102int serial_tstc (void)
103{
104 return LSR(CFG_IXP425_CONSOLE) & LSR_DR;
105}
106
107/*
108 * Read a single byte from the serial port. Returns 1 on success, 0
109 * otherwise. When the function is succesfull, the character read is
110 * written into its argument c.
111 */
112int serial_getc (void)
113{
114 while (!(LSR(CFG_IXP425_CONSOLE) & LSR_DR));
115
116 return (char) RBR(CFG_IXP425_CONSOLE) & 0xff;
117}
118
119void
120serial_puts (const char *s)
121{
122 while (*s) {
123 serial_putc (*s++);
124 }
125}