release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/plat-mxc/iomux-v3.c

   1 /*
   2  * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
   3  * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
   4  * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
   5  *                       <armlinux@phytec.de>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19  * MA 02110-1301, USA.
  20  */
  21 #include <linux/errno.h>
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/string.h>
  26 #include <linux/gpio.h>
  27
  28 #include <mach/hardware.h>
  29 #include <asm/mach/map.h>
  30 #include <mach/iomux-v3.h>
  31
  32 static void __iomem *base;
  33
  34 /*
  35  * setups a single pad in the iomuxer
  36  */
  37 int mxc_iomux_v3_setup_pad(struct pad_desc *pad)
  38 {
  39         if (pad->mux_ctrl_ofs)
  40                 __raw_writel(pad->mux_mode, base + pad->mux_ctrl_ofs);
  41
  42         if (pad->select_input_ofs)
  43                 __raw_writel(pad->select_input,
  44                                 base + pad->select_input_ofs);
  45
  46         if (!(pad->pad_ctrl & NO_PAD_CTRL) && pad->pad_ctrl_ofs)
  47                 __raw_writel(pad->pad_ctrl, base + pad->pad_ctrl_ofs);
  48         return 0;
  49 }
  50 EXPORT_SYMBOL(mxc_iomux_v3_setup_pad);
  51
  52 int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count)
  53 {
  54         struct pad_desc *p = pad_list;
  55         int i;
  56         int ret;
  57
  58         for (i = 0; i < count; i++) {
  59                 ret = mxc_iomux_v3_setup_pad(p);
  60                 if (ret)
  61                         return ret;
  62                 p++;
  63         }
  64         return 0;
  65 }
  66 EXPORT_SYMBOL(mxc_iomux_v3_setup_multiple_pads);
  67
  68 void mxc_iomux_v3_init(void __iomem *iomux_v3_base)
  69 {
  70         base = iomux_v3_base;
  71 }