board_hl200.c revision 185305
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 "opt_at91.h" 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: head/sys/arm/at91/board_kb920x.c 185305 2008-11-25 18:40:40Z imp $"); 31#include <sys/param.h> 32#include <sys/systm.h> 33 34#include <arm/at91/at91board.h> 35#include <arm/at91/at91rm92reg.h> 36#include <arm/at91/at91_piovar.h> 37#include <arm/at91/at91_pio_rm9200.h> 38 39long 40board_init(void) 41{ 42 /* 43 * Since the USART supports RS-485 multidrop mode, it allows the 44 * TX pins to float. However, for RS-232 operations, we don't want 45 * these pins to float. Instead, they should be pulled up to avoid 46 * mismatches. Linux does something similar when it configures the 47 * TX lines. This implies that we also allow the RX lines to float 48 * rather than be in the state they are left in by the boot loader. 49 * Since they are input pins, I think that this is the right thing 50 * to do. 51 */ 52 53 /* PIOA's A periph: Turn USART 0 and 2's TX/RX pins */ 54 at91_pio_use_periph_a(AT91RM92_PIOA_BASE, 55 AT91C_PA18_RXD0 | AT91C_PA22_RXD2, 0); 56 at91_pio_use_periph_a(AT91RM92_PIOA_BASE, 57 AT91C_PA17_TXD0 | AT91C_PA23_TXD2, 1); 58 /* PIOA's B periph: Turn USART 3's TX/RX pins */ 59 at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA6_RXD3, 0); 60 at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA5_TXD3, 1); 61#ifdef AT91_TSC 62 /* We're using TC0's A1 and A2 input */ 63 at91_pio_use_periph_b(AT91RM92_PIOA_BASE, 64 AT91C_PA19_TIOA1 | AT91C_PA21_TIOA2, 0); 65#endif 66 /* PIOB's A periph: Turn USART 1's TX/RX pins */ 67 at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB21_RXD1, 0); 68 at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB20_TXD1, 1); 69 70 /* Pin assignment */ 71#ifdef AT91_TSC 72 /* Assert PA24 low -- talk to rubidium */ 73 at91_pio_use_gpio(AT91RM92_PIOA_BASE, AT91C_PIO_PA24); 74 at91_pio_gpio_output(AT91RM92_PIOA_BASE, AT91C_PIO_PA24, 0); 75 at91_pio_gpio_clear(AT91RM92_PIOA_BASE, AT91C_PIO_PA24); 76 at91_pio_use_gpio(AT91RM92_PIOB_BASE, 77 AT91C_PIO_PB16 | AT91C_PIO_PB17 | AT91C_PIO_PB18 | AT91C_PIO_PB19); 78#endif 79 80 return (at91_ramsize()); 81} 82