board_kb920x.c revision 213496
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: head/sys/arm/at91/board_kb920x.c 213496 2010-10-06 22:25:21Z cognet $"); 29#include <sys/param.h> 30#include <sys/systm.h> 31 32#include <arm/at91/at91var.h> 33#include <arm/at91/at91board.h> 34#include <arm/at91/at91rm92reg.h> 35#include <arm/at91/at91_piovar.h> 36#include <arm/at91/at91_pio_rm9200.h> 37 38long 39board_init(void) 40{ 41 /* 42 * Since the USART supports RS-485 multidrop mode, it allows the 43 * TX pins to float. However, for RS-232 operations, we don't want 44 * these pins to float. Instead, they should be pulled up to avoid 45 * mismatches. Linux does something similar when it configures the 46 * TX lines. This implies that we also allow the RX lines to float 47 * rather than be in the state they are left in by the boot loader. 48 * Since they are input pins, I think that this is the right thing 49 * to do. 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 /* MMC/SD Interface */ 64 at91_pio_use_periph_a(AT91RM92_PIOA_BASE,AT91C_PA27_MCCK, 0); 65 at91_pio_use_periph_a(AT91RM92_PIOA_BASE,AT91C_PA28_MCCDA, 1); 66 at91_pio_use_periph_a(AT91RM92_PIOA_BASE,AT91C_PA29_MCDA0, 1); 67 at91_pio_use_periph_b(AT91RM92_PIOB_BASE,AT91C_PB3_MCDA1, 1); 68 at91_pio_use_periph_b(AT91RM92_PIOB_BASE,AT91C_PB4_MCDA2, 1); 69 at91_pio_use_periph_b(AT91RM92_PIOB_BASE,AT91C_PB5_MCDA3, 1); 70 71 return (at91_ramsize()); 72} 73