1 /*-
2 * Copyright (c) 2005-2008 Olivier Houchard. All rights reserved.
3 * Copyright (c) 2005-2008 Warner Losh. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: src/sys/arm/at91/board_bwct.c,v 1.1 2008/11/25 19:05:46 imp Exp $");
29 #include <sys/param.h>
30 #include <sys/systm.h>
31
32 #include <arm/at91/at91board.h>
33 #include <arm/at91/at91rm92reg.h>
34 #include <arm/at91/at91_piovar.h>
35 #include <arm/at91/at91_pio_rm9200.h>
36
37 long
38 board_init(void)
39 {
40 /*
41 * Since the USART supports RS-485 multidrop mode, it allows the
42 * TX pins to float. However, for RS-232 operations, we don't want
43 * these pins to float. Instead, they should be pulled up to avoid
44 * mismatches. Linux does something similar when it configures the
45 * TX lines. This implies that we also allow the RX lines to float
46 * rather than be in the state they are left in by the boot loader.
47 * Since they are input pins, I think that this is the right thing
48 * to do.
49 */
50
51 /* PIOA's A periph: Turn USART 0 and 2's TX/RX pins */
52 at91_pio_use_periph_a(AT91RM92_PIOA_BASE,
53 AT91C_PA18_RXD0 | AT91C_PA22_RXD2, 0);
54 at91_pio_use_periph_a(AT91RM92_PIOA_BASE,
55 AT91C_PA17_TXD0 | AT91C_PA23_TXD2, 1);
56 /* PIOA's B periph: Turn USART 3's TX/RX pins */
57 at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA6_RXD3, 0);
58 at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA5_TXD3, 1);
59 /* PIOB's A periph: Turn USART 1's TX/RX pins */
60 at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB21_RXD1, 0);
61 at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB20_TXD1, 1);
62
63 /* Pin assignment */
64
65 return (at91_ramsize());
66 }
67 Cache object: 2bd38cf0c9e30a370e120eaebf61499e
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