firmware/target/arm/imx31/iomuxc-imx31.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (c) 2010 Michael Sevakis
  11  *
  12  * i.MX31 IOMUXC helper routines
  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
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20  * KIND, either express or implied.
  21  *
  22  ****************************************************************************/
  23 #include "config.h"
  24 #include "system.h"
  25 #include "iomuxc-imx31.h"
  26
  27
  28 /* Set the pin multiplexing configuration (functional, GPIO, etc.) */
  29 void iomuxc_set_pin_mux(enum IMX31_IOMUXC_PINS pin,
  30                         unsigned long mux)
  31 {
  32     unsigned long index = pin / 4;
  33     unsigned int shift = 8*(pin % 4);
  34
  35     imx31_regmod32((unsigned long *)(IOMUXC_BASE_ADDR + 0xc) + index,
  36                    mux << shift, IOMUXC_MUX_MASK << shift);
  37 }
  38
  39
  40 /* Set the pin pad configuration (keeper, drive strength, etc.) */
  41 void iomuxc_set_pad_config(enum IMX31_IOMUXC_PINS pin,
  42                            unsigned long config)
  43 {
  44     unsigned long padoffs = pin + 2;
  45     unsigned long index = padoffs / 3;
  46     unsigned int shift = 10*(padoffs % 3);
  47
  48     imx31_regmod32((unsigned long *)(IOMUXC_BASE_ADDR + 0x154) + index,
  49                    config << shift, IOMUXC_PAD_MASK << shift);
  50 }