LXR linux/arch/arm/mach-imx/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 <asm/mach/map.h>
  29
  30#include "hardware.h"
  31#include "iomux-v3.h"
  32
  33static void __iomem *base;
  34
  35/*
  36 * configures a single pad in the iomuxer
  37 */
  38int mxc_iomux_v3_setup_pad(iomux_v3_cfg_t pad)
  39{
  40        u32 mux_ctrl_ofs = (pad & MUX_CTRL_OFS_MASK) >> MUX_CTRL_OFS_SHIFT;
  41        u32 mux_mode = (pad & MUX_MODE_MASK) >> MUX_MODE_SHIFT;
  42        u32 sel_input_ofs = (pad & MUX_SEL_INPUT_OFS_MASK) >> MUX_SEL_INPUT_OFS_SHIFT;
  43        u32 sel_input = (pad & MUX_SEL_INPUT_MASK) >> MUX_SEL_INPUT_SHIFT;
  44        u32 pad_ctrl_ofs = (pad & MUX_PAD_CTRL_OFS_MASK) >> MUX_PAD_CTRL_OFS_SHIFT;
  45        u32 pad_ctrl = (pad & MUX_PAD_CTRL_MASK) >> MUX_PAD_CTRL_SHIFT;
  46
  47        if (mux_ctrl_ofs)
  48                imx_writel(mux_mode, base + mux_ctrl_ofs);
  49
  50        if (sel_input_ofs)
  51                imx_writel(sel_input, base + sel_input_ofs);
  52
  53        if (!(pad_ctrl & NO_PAD_CTRL) && pad_ctrl_ofs)
  54                imx_writel(pad_ctrl, base + pad_ctrl_ofs);
  55
  56        return 0;
  57}
  58
  59int mxc_iomux_v3_setup_multiple_pads(const iomux_v3_cfg_t *pad_list,
  60                unsigned count)
  61{
  62        const iomux_v3_cfg_t *p = pad_list;
  63        int i;
  64        int ret;
  65
  66        for (i = 0; i < count; i++) {
  67                ret = mxc_iomux_v3_setup_pad(*p);
  68                if (ret)
  69                        return ret;
  70                p++;
  71        }
  72        return 0;
  73}
  74
  75void mxc_iomux_v3_init(void __iomem *iomux_v3_base)
  76{
  77        base = iomux_v3_base;
  78}
  79