board_bwct.c revision 238189
1155324Simp/*- 2185305Simp * Copyright (c) 2005-2008 Olivier Houchard. All rights reserved. 3185305Simp * Copyright (c) 2005-2008 Warner Losh. All rights reserved. 4155324Simp * 5155324Simp * Redistribution and use in source and binary forms, with or without 6155324Simp * modification, are permitted provided that the following conditions 7155324Simp * are met: 8155324Simp * 1. Redistributions of source code must retain the above copyright 9155324Simp * notice, this list of conditions and the following disclaimer. 10155324Simp * 2. Redistributions in binary form must reproduce the above copyright 11155324Simp * notice, this list of conditions and the following disclaimer in the 12155324Simp * documentation and/or other materials provided with the distribution. 13155324Simp * 14185305Simp * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15185305Simp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16185305Simp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17185305Simp * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 18185305Simp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19185305Simp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20185305Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21155324Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22155324Simp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23155324Simp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24155324Simp * SUCH DAMAGE. 25155324Simp */ 26155324Simp 27155324Simp#include <sys/cdefs.h> 28155324Simp__FBSDID("$FreeBSD: head/sys/arm/at91/board_bwct.c 238189 2012-07-07 05:02:39Z imp $"); 29155324Simp#include <sys/param.h> 30155324Simp#include <sys/systm.h> 31155324Simp 32238189Simp#include <machine/board.h> 33185305Simp#include <arm/at91/at91board.h> 34155324Simp#include <arm/at91/at91rm92reg.h> 35160363Simp#include <arm/at91/at91_piovar.h> 36160363Simp#include <arm/at91/at91_pio_rm9200.h> 37155324Simp 38238189SimpBOARD_INIT long 39160363Simpboard_init(void) 40160363Simp{ 41160363Simp /* 42174880Sstas * Since the USART supports RS-485 multidrop mode, it allows the 43160363Simp * TX pins to float. However, for RS-232 operations, we don't want 44160363Simp * these pins to float. Instead, they should be pulled up to avoid 45160363Simp * mismatches. Linux does something similar when it configures the 46160363Simp * TX lines. This implies that we also allow the RX lines to float 47160363Simp * rather than be in the state they are left in by the boot loader. 48160363Simp * Since they are input pins, I think that this is the right thing 49160363Simp * to do. 50160363Simp */ 51160363Simp 52160363Simp /* PIOA's A periph: Turn USART 0 and 2's TX/RX pins */ 53160363Simp at91_pio_use_periph_a(AT91RM92_PIOA_BASE, 54160363Simp AT91C_PA18_RXD0 | AT91C_PA22_RXD2, 0); 55160363Simp at91_pio_use_periph_a(AT91RM92_PIOA_BASE, 56160363Simp AT91C_PA17_TXD0 | AT91C_PA23_TXD2, 1); 57160363Simp /* PIOA's B periph: Turn USART 3's TX/RX pins */ 58160363Simp at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA6_RXD3, 0); 59160363Simp at91_pio_use_periph_b(AT91RM92_PIOA_BASE, AT91C_PA5_TXD3, 1); 60160363Simp /* PIOB's A periph: Turn USART 1's TX/RX pins */ 61160363Simp at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB21_RXD1, 0); 62160363Simp at91_pio_use_periph_a(AT91RM92_PIOB_BASE, AT91C_PB20_TXD1, 1); 63160363Simp 64160363Simp /* Pin assignment */ 65160363Simp 66185305Simp return (at91_ramsize()); 67160363Simp} 68238189Simp 69238189SimpARM_BOARD(NONE, "BWCT special"); 70