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d703355fd1
This is a copy of arm926ejs/at91 api for perpherial initialisation. At the moment we just need the usart part of the api. Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/*
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* [partely copied from arch/arm/cpu/arm926ejs/at91/arm9260_devices.c]
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*
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* (C) Copyright 2011
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* Andreas Bießmann <andreas.devel@googlemail.com>
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*
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* (C) Copyright 2007-2008
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* Stelian Pop <stelian.pop@leadtechdesign.com>
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* Lead Tech Design <www.leadtechdesign.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/at91_common.h>
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#include <asm/arch/at91_pmc.h>
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#include <asm/arch/gpio.h>
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/*
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* if CONFIG_AT91_GPIO_PULLUP ist set, keep pullups on on all
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* peripheral pins. Good to have if hardware is soldered optionally
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* or in case of SPI no slave is selected. Avoid lines to float
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* needlessly. Use a short local PUP define.
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*
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* Due to errata "TXD floats when CTS is inactive" pullups are always
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* on for TXD pins.
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*/
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#ifdef CONFIG_AT91_GPIO_PULLUP
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# define PUP CONFIG_AT91_GPIO_PULLUP
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#else
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# define PUP 0
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#endif
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void at91_serial0_hw_init(void)
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{
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at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
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at91_set_a_periph(AT91_PIO_PORTA, 17, 1); /* TXD0 */
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at91_set_a_periph(AT91_PIO_PORTA, 18, PUP); /* RXD0 */
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writel(1 << ATMEL_ID_USART0, &pmc->pcer);
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}
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void at91_serial1_hw_init(void)
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{
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at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
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at91_set_a_periph(AT91_PIO_PORTB, 20, PUP); /* RXD1 */
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at91_set_a_periph(AT91_PIO_PORTB, 21, 1); /* TXD1 */
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writel(1 << ATMEL_ID_USART1, &pmc->pcer);
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}
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void at91_serial2_hw_init(void)
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{
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at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
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at91_set_a_periph(AT91_PIO_PORTA, 22, PUP); /* RXD2 */
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at91_set_a_periph(AT91_PIO_PORTA, 23, 1); /* TXD2 */
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writel(1 << ATMEL_ID_USART2, &pmc->pcer);
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}
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void at91_seriald_hw_init(void)
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{
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at91_set_a_periph(AT91_PIO_PORTA, 30, PUP); /* DRXD */
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at91_set_a_periph(AT91_PIO_PORTA, 31, 1); /* DTXD */
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/* writing SYS to PCER has no effect on AT91RM9200 */
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}
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