LXR uboot/arch/arm/cpu/arm920t/at91/at91rm9200

   1/*
   2 * [partely copied from arch/arm/cpu/arm926ejs/at91/arm9260_devices.c]
   3 *
   4 * (C) Copyright 2011
   5 * Andreas Bießmann <andreas.devel@googlemail.com>
   6 *
   7 * (C) Copyright 2007-2008
   8 * Stelian Pop <stelian@popies.net>
   9 * Lead Tech Design <www.leadtechdesign.com>
  10 *
  11 * See file CREDITS for list of people who contributed to this
  12 * project.
  13 *
  14 * This program is free software; you can redistribute it and/or
  15 * modify it under the terms of the GNU General Public License as
  16 * published by the Free Software Foundation; either version 2 of
  17 * the License, or (at your option) any later version.
  18 *
  19 * This program is distributed in the hope that it will be useful,
  20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22 * GNU General Public License for more details.
  23 *
  24 * You should have received a copy of the GNU General Public License
  25 * along with this program; if not, write to the Free Software
  26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  27 * MA 02111-1307 USA
  28 */
  29
  30#include <common.h>
  31#include <asm/io.h>
  32#include <asm/arch/at91_common.h>
  33#include <asm/arch/at91_pmc.h>
  34#include <asm/arch/gpio.h>
  35
  36/*
  37 * if CONFIG_AT91_GPIO_PULLUP ist set, keep pullups on on all
  38 * peripheral pins. Good to have if hardware is soldered optionally
  39 * or in case of SPI no slave is selected. Avoid lines to float
  40 * needlessly. Use a short local PUP define.
  41 *
  42 * Due to errata "TXD floats when CTS is inactive" pullups are always
  43 * on for TXD pins.
  44 */
  45#ifdef CONFIG_AT91_GPIO_PULLUP
  46# define PUP CONFIG_AT91_GPIO_PULLUP
  47#else
  48# define PUP 0
  49#endif
  50
  51void at91_serial0_hw_init(void)
  52{
  53        at91_pmc_t      *pmc    = (at91_pmc_t *)ATMEL_BASE_PMC;
  54
  55        at91_set_a_periph(AT91_PIO_PORTA, 17, 1);               /* TXD0 */
  56        at91_set_a_periph(AT91_PIO_PORTA, 18, PUP);             /* RXD0 */
  57        writel(1 << ATMEL_ID_USART0, &pmc->pcer);
  58}
  59
  60void at91_serial1_hw_init(void)
  61{
  62        at91_pmc_t      *pmc    = (at91_pmc_t *)ATMEL_BASE_PMC;
  63
  64        at91_set_a_periph(AT91_PIO_PORTB, 20, PUP);             /* RXD1 */
  65        at91_set_a_periph(AT91_PIO_PORTB, 21, 1);               /* TXD1 */
  66        writel(1 << ATMEL_ID_USART1, &pmc->pcer);
  67}
  68
  69void at91_serial2_hw_init(void)
  70{
  71        at91_pmc_t      *pmc    = (at91_pmc_t *)ATMEL_BASE_PMC;
  72
  73        at91_set_a_periph(AT91_PIO_PORTA, 22, PUP);             /* RXD2 */
  74        at91_set_a_periph(AT91_PIO_PORTA, 23, 1);               /* TXD2 */
  75        writel(1 << ATMEL_ID_USART2, &pmc->pcer);
  76}
  77
  78void at91_seriald_hw_init(void)
  79{
  80        at91_set_a_periph(AT91_PIO_PORTA, 30, PUP);             /* DRXD */
  81        at91_set_a_periph(AT91_PIO_PORTA, 31, 1);               /* DTXD */
  82        /* writing SYS to PCER has no effect on AT91RM9200 */
  83}
  84