arch/arm/mach-u300/padmux.c

   1 /*
   2  *
   3  * arch/arm/mach-u300/padmux.c
   4  *
   5  *
   6  * Copyright (C) 2009 ST-Ericsson AB
   7  * License terms: GNU General Public License (GPL) version 2
   8  * U300 PADMUX functions
   9  * Author: Linus Walleij <linus.walleij@stericsson.com>
  10  *
  11  */
  12 #include <linux/io.h>
  13 #include <linux/err.h>
  14 #include <mach/u300-regs.h>
  15 #include <mach/syscon.h>
  16
  17 #include "padmux.h"
  18
  19 /* Set the PAD MUX to route the MMC reader correctly to GPIO0. */
  20 void pmx_set_mission_mode_mmc(void)
  21 {
  22         u16 val;
  23
  24         val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMC1LR);
  25         val &= ~U300_SYSCON_PMC1LR_MMCSD_MASK;
  26         writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMC1LR);
  27         val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
  28         val &= ~U300_SYSCON_PMC1HR_APP_GPIO_1_MASK;
  29         val |= U300_SYSCON_PMC1HR_APP_GPIO_1_MMC;
  30         writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
  31 }
  32
  33 void pmx_set_mission_mode_spi(void)
  34 {
  35         u16 val;
  36
  37         /* Set up padmuxing so the SPI port and its chipselects are active */
  38         val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
  39         /*
  40          * Activate the SPI port (disable the use of these pins for generic
  41          * GPIO, DSP, AAIF
  42          */
  43         val &= ~U300_SYSCON_PMC1HR_APP_SPI_2_MASK;
  44         val |= U300_SYSCON_PMC1HR_APP_SPI_2_SPI;
  45         /*
  46          * Use GPIO pin SPI CS1 for CS1 actually (it can be used for other
  47          * things also)
  48          */
  49         val &= ~U300_SYSCON_PMC1HR_APP_SPI_CS_1_MASK;
  50         val |= U300_SYSCON_PMC1HR_APP_SPI_CS_1_SPI;
  51         /*
  52          * Use GPIO pin SPI CS2 for CS2 actually (it can be used for other
  53          * things also)
  54          */
  55         val &= ~U300_SYSCON_PMC1HR_APP_SPI_CS_2_MASK;
  56         val |= U300_SYSCON_PMC1HR_APP_SPI_CS_2_SPI;
  57         writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
  58 }