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
  30 static 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
  40 int 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
  48 void 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
  55 void 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