source: SVN/rincon/u-boot/cpu/arm920t/at91rm9200/serial.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 22 months ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 2.9 KB
Line 
1/*
2 * (C) Copyright 2002
3 * Lineo, Inc <www.lineo.com>
4 * Bernhard Kuhn <bkuhn@lineo.com>
5 *
6 * (C) Copyright 2002
7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
8 * Marius Groeger <mgroeger@sysgo.de>
9 *
10 * (C) Copyright 2002
11 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
12 * Alex Zuepke <azu@sysgo.de>
13 *
14 * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
29 *
30 */
31
32#include <common.h>
33#include <asm/io.h>
34#include <asm/arch/hardware.h>
35
36DECLARE_GLOBAL_DATA_PTR;
37
38#if !defined(CONFIG_DBGU) && !defined(CONFIG_USART0) && !defined(CONFIG_USART1)
39#error must define one of CONFIG_DBGU or CONFIG_USART0 or CONFIG_USART1
40#endif
41
42/* ggi thunder */
43#ifdef CONFIG_DBGU
44AT91PS_USART us = (AT91PS_USART) AT91C_BASE_DBGU;
45#endif
46#ifdef CONFIG_USART0
47AT91PS_USART us = (AT91PS_USART) AT91C_BASE_US0;
48#endif
49#ifdef CONFIG_USART1
50AT91PS_USART us = (AT91PS_USART) AT91C_BASE_US1;
51#endif
52
53void serial_setbrg (void)
54{
55        int baudrate;
56
57        if ((baudrate = gd->baudrate) <= 0)
58                baudrate = CONFIG_BAUDRATE;
59        /* MASTER_CLOCK/(16 * baudrate) */
60        us->US_BRGR = (AT91C_MASTER_CLOCK >> 4) / (unsigned)baudrate;
61}
62
63int serial_init (void)
64{
65        /* make any port initializations specific to this port */
66#ifdef CONFIG_DBGU
67        *AT91C_PIOA_PDR = AT91C_PA31_DTXD | AT91C_PA30_DRXD;    /* PA 31 & 30 */
68        *AT91C_PMC_PCER = 1 << AT91C_ID_SYS;    /* enable clock */
69#endif
70#ifdef CONFIG_USART0
71        *AT91C_PIOA_PDR = AT91C_PA17_TXD0 | AT91C_PA18_RXD0;
72        *AT91C_PMC_PCER |= 1 << AT91C_ID_USART0;        /* enable clock */
73#endif
74#ifdef CONFIG_USART1
75        *AT91C_PIOB_PDR = AT91C_PB21_TXD1 | AT91C_PB20_RXD1;
76        *AT91C_PMC_PCER |= 1 << AT91C_ID_USART1;        /* enable clock */
77#endif
78        serial_setbrg ();
79
80        us->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX;
81        us->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;
82        us->US_MR =
83                (AT91C_US_CLKS_CLOCK | AT91C_US_CHRL_8_BITS |
84                 AT91C_US_PAR_NONE | AT91C_US_NBSTOP_1_BIT);
85        us->US_IMR = ~0ul;
86        return (0);
87}
88
89void serial_putc (const char c)
90{
91        if (c == '\n')
92                serial_putc ('\r');
93        while ((us->US_CSR & AT91C_US_TXRDY) == 0);
94        us->US_THR = c;
95}
96
97void serial_puts (const char *s)
98{
99        while (*s) {
100                serial_putc (*s++);
101        }
102}
103
104int serial_getc (void)
105{
106        while ((us->US_CSR & AT91C_US_RXRDY) == 0);
107        return us->US_RHR;
108}
109
110int serial_tstc (void)
111{
112        return ((us->US_CSR & AT91C_US_RXRDY) == AT91C_US_RXRDY);
113}
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