The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/at91/board_hl200.c

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    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: releng/8.1/sys/arm/at91/board_hl200.c 185539 2008-12-02 02:26:15Z peter $");
   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         /* PIOA's A periph: Turn USART 0 and 2's TX/RX pins */
   51         at91_pio_use_periph_a(AT91RM92_PIOA_BASE,
   52             AT91C_PA18_RXD0 | AT91C_PA22_RXD2, 0);
   53         at91_pio_use_periph_a(AT91RM92_PIOA_BASE,
   54             AT91C_PA17_TXD0 | AT91C_PA23_TXD2, 1);
   55         /* PIOA's B periph: Turn USART 3's TX/RX pins */
   56         at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA6_RXD3, 0);
   57         at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA5_TXD3, 1);
   58         /* PIOB's A periph: Turn USART 1's TX/RX pins */
   59         at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB21_RXD1, 0);
   60         at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB20_TXD1, 1);
   61 
   62         return (at91_ramsize());
   63 }

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