LXR uboot/board/emk/top9000/spi.c

   1/*
   2 * Copyright (C) 2010
   3 * Reinhard Meyer, EMK Elektronik, reinhard.meyer@emk-elektronik.de
   4 *
   5 * See file CREDITS for list of people who contributed to this
   6 * project.
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of
  11 * the License, or (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21 * MA 02111-1307 USA
  22 */
  23
  24#include <common.h>
  25#include <asm/arch/hardware.h>
  26#include <asm/arch/at91_spi.h>
  27#include <asm/arch/gpio.h>
  28#include <spi.h>
  29
  30static const struct {
  31        u32     port;
  32        u32     bit;
  33} cs_to_portbit[2][4] = {
  34        {{AT91_PIO_PORTA,  3}, {AT91_PIO_PORTC, 11},
  35                        {AT91_PIO_PORTC, 16}, {AT91_PIO_PORTC, 17} },
  36        {{AT91_PIO_PORTB,  3}, {AT91_PIO_PORTC,  5},
  37                        {AT91_PIO_PORTC,  4}, {AT91_PIO_PORTC,  3} }
  38};
  39
  40int spi_cs_is_valid(unsigned int bus, unsigned int cs)
  41{
  42        debug("spi_cs_is_valid: bus=%u cs=%u\n", bus, cs);
  43        if (bus < 2 && cs < 4)
  44                return 1;
  45        return 0;
  46}
  47
  48void spi_cs_activate(struct spi_slave *slave)
  49{
  50        debug("spi_cs_activate: bus=%u cs=%u\n", slave->bus, slave->cs);
  51        at91_set_pio_output(cs_to_portbit[slave->bus][slave->cs].port,
  52                cs_to_portbit[slave->bus][slave->cs].bit, 0);
  53}
  54
  55void spi_cs_deactivate(struct spi_slave *slave)
  56{
  57        debug("spi_cs_deactivate: bus=%u cs=%u\n", slave->bus, slave->cs);
  58        at91_set_pio_output(cs_to_portbit[slave->bus][slave->cs].port,
  59                cs_to_portbit[slave->bus][slave->cs].bit, 1);
  60}
  61