u-boot/arch/arm/cpu/arm920t/at91/at91rm9200_devices.c

/*
 * [partely copied from arch/arm/cpu/arm926ejs/at91/arm9260_devices.c]
 *
 * (C) Copyright 2011
 * Andreas Bießmann <andreas.devel@googlemail.com>
 *
 * (C) Copyright 2007-2008
 * Stelian Pop <stelian@popies.net>
 * Lead Tech Design <www.leadtechdesign.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <asm/io.h>
#include <asm/arch/at91_common.h>
#include <asm/arch/at91_pmc.h>
#include <asm/arch/gpio.h>

/*
 * if CONFIG_AT91_GPIO_PULLUP ist set, keep pullups on on all
 * peripheral pins. Good to have if hardware is soldered optionally
 * or in case of SPI no slave is selected. Avoid lines to float
 * needlessly. Use a short local PUP define.
 *
 * Due to errata "TXD floats when CTS is inactive" pullups are always
 * on for TXD pins.
 */
#ifdef CONFIG_AT91_GPIO_PULLUP
# define PUP CONFIG_AT91_GPIO_PULLUP
#else
# define PUP 0
#endif

void at91_serial0_hw_init(void)
{
	at91_pmc_t	*pmc	= (at91_pmc_t *)ATMEL_BASE_PMC;

	at91_set_a_periph(AT91_PIO_PORTA, 17, 1);		/* TXD0 */
	at91_set_a_periph(AT91_PIO_PORTA, 18, PUP);		/* RXD0 */
	writel(1 << ATMEL_ID_USART0, &pmc->pcer);
}

void at91_serial1_hw_init(void)
{
	at91_pmc_t	*pmc	= (at91_pmc_t *)ATMEL_BASE_PMC;

	at91_set_a_periph(AT91_PIO_PORTB, 20, PUP);		/* RXD1 */
	at91_set_a_periph(AT91_PIO_PORTB, 21, 1);		/* TXD1 */
	writel(1 << ATMEL_ID_USART1, &pmc->pcer);
}

void at91_serial2_hw_init(void)
{
	at91_pmc_t	*pmc	= (at91_pmc_t *)ATMEL_BASE_PMC;

	at91_set_a_periph(AT91_PIO_PORTA, 22, PUP);		/* RXD2 */
	at91_set_a_periph(AT91_PIO_PORTA, 23, 1);		/* TXD2 */
	writel(1 << ATMEL_ID_USART2, &pmc->pcer);
}

void at91_seriald_hw_init(void)
{
	at91_set_a_periph(AT91_PIO_PORTA, 30, PUP);		/* DRXD */
	at91_set_a_periph(AT91_PIO_PORTA, 31, 1);		/* DTXD */
	/* writing SYS to PCER has no effect on AT91RM9200 */
}