LXR linux/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
  32static void __iomem *base;
  33
  34static unsigned long iomux_v3_pad_alloc_map[0x200 / BITS_PER_LONG];
  35
  36/*
  37 * setups a single pin:
  38 *      - reserves the pin so that it is not claimed by another driver
  39 *      - setups the iomux according to the configuration
  40 */
  41int mxc_iomux_v3_setup_pad(struct pad_desc *pad)
  42{
  43        unsigned int pad_ofs = pad->pad_ctrl_ofs;
  44
  45        if (test_and_set_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map))
  46                return -EBUSY;
  47        if (pad->mux_ctrl_ofs)
  48                __raw_writel(pad->mux_mode, base + pad->mux_ctrl_ofs);
  49
  50        if (pad->select_input_ofs)
  51                __raw_writel(pad->select_input,
  52                                base + pad->select_input_ofs);
  53
  54        if (!(pad->pad_ctrl & NO_PAD_CTRL) && pad->pad_ctrl_ofs)
  55                __raw_writel(pad->pad_ctrl, base + pad->pad_ctrl_ofs);
  56        return 0;
  57}
  58EXPORT_SYMBOL(mxc_iomux_v3_setup_pad);
  59
  60int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count)
  61{
  62        struct pad_desc *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                        goto setup_error;
  70                p++;
  71        }
  72        return 0;
  73
  74setup_error:
  75        mxc_iomux_v3_release_multiple_pads(pad_list, i);
  76        return ret;
  77}
  78EXPORT_SYMBOL(mxc_iomux_v3_setup_multiple_pads);
  79
  80void mxc_iomux_v3_release_pad(struct pad_desc *pad)
  81{
  82        unsigned int pad_ofs = pad->pad_ctrl_ofs;
  83
  84        clear_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map);
  85}
  86EXPORT_SYMBOL(mxc_iomux_v3_release_pad);
  87
  88void mxc_iomux_v3_release_multiple_pads(struct pad_desc *pad_list, int count)
  89{
  90        struct pad_desc *p = pad_list;
  91        int i;
  92
  93        for (i = 0; i < count; i++) {
  94                mxc_iomux_v3_release_pad(p);
  95                p++;
  96        }
  97}
  98EXPORT_SYMBOL(mxc_iomux_v3_release_multiple_pads);
  99
 100void mxc_iomux_v3_init(void __iomem *iomux_v3_base)
 101{
 102        base = iomux_v3_base;
 103}
 104