76 lines
3.2 KiB
C
76 lines
3.2 KiB
C
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/*-
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* Copyright (c) 2005-2008 Olivier Houchard. All rights reserved.
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* Copyright (c) 2005-2008 Warner Losh. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <arm/at91/at91board.h>
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#include <arm/at91/at91rm92reg.h>
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#include <arm/at91/at91_piovar.h>
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#include <arm/at91/at91_pio_rm9200.h>
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long
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board_init(void)
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{
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/*
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* Since the USART supports RS-485 multidrop mode, it allows the
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* TX pins to float. However, for RS-232 operations, we don't want
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* these pins to float. Instead, they should be pulled up to avoid
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* mismatches. Linux does something similar when it configures the
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* TX lines. This implies that we also allow the RX lines to float
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* rather than be in the state they are left in by the boot loader.
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* Since they are input pins, I think that this is the right thing
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* to do.
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*/
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/* PIOA's A periph: Turn USART 0 and 2's TX/RX pins */
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at91_pio_use_periph_a(AT91RM92_PIOA_BASE,
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AT91C_PA18_RXD0 | AT91C_PA22_RXD2, 0);
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at91_pio_use_periph_a(AT91RM92_PIOA_BASE,
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AT91C_PA17_TXD0 | AT91C_PA23_TXD2, 1);
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/* PIOA's B periph: Turn USART 3's TX/RX pins */
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at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA6_RXD3, 0);
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at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA5_TXD3, 1);
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/* We're using TC0's A1 and A2 input */
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at91_pio_use_periph_b(AT91RM92_PIOA_BASE,
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AT91C_PA19_TIOA1 | AT91C_PA21_TIOA2, 0);
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/* PIOB's A periph: Turn USART 1's TX/RX pins */
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at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB21_RXD1, 0);
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at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB20_TXD1, 1);
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/* Pin assignment */
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/* Assert PA24 low -- talk to rubidium */
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at91_pio_use_gpio(AT91RM92_PIOA_BASE, AT91C_PIO_PA24);
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at91_pio_gpio_output(AT91RM92_PIOA_BASE, AT91C_PIO_PA24, 0);
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at91_pio_gpio_clear(AT91RM92_PIOA_BASE, AT91C_PIO_PA24);
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at91_pio_use_gpio(AT91RM92_PIOB_BASE,
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AT91C_PIO_PB16 | AT91C_PIO_PB17 | AT91C_PIO_PB18 | AT91C_PIO_PB19);
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return (at91_ramsize());
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}
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