LXR linux/arch/arm/mach-mxs/iomux.c

   1/*
   2 * Copyright 2004-2006,2010 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
  22#include <linux/errno.h>
  23#include <linux/init.h>
  24#include <linux/kernel.h>
  25#include <linux/module.h>
  26#include <linux/string.h>
  27#include <linux/gpio.h>
  28
  29#include <asm/mach/map.h>
  30
  31#include <mach/mxs.h>
  32#include <mach/iomux.h>
  33
  34/*
  35 * configures a single pad in the iomuxer
  36 */
  37int mxs_iomux_setup_pad(iomux_cfg_t pad)
  38{
  39        u32 reg, ofs, bp, bm;
  40        void __iomem *iomux_base = MXS_IO_ADDRESS(MXS_PINCTRL_BASE_ADDR);
  41
  42        /* muxsel */
  43        ofs = 0x100;
  44        ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
  45        bp = PAD_PIN(pad) % 16 * 2;
  46        bm = 0x3 << bp;
  47        reg = __raw_readl(iomux_base + ofs);
  48        reg &= ~bm;
  49        reg |= PAD_MUXSEL(pad) << bp;
  50        __raw_writel(reg, iomux_base + ofs);
  51
  52        /* drive */
  53        ofs = cpu_is_mx23() ? 0x200 : 0x300;
  54        ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10;
  55        /* mA */
  56        if (PAD_MA_VALID(pad)) {
  57                bp = PAD_PIN(pad) % 8 * 4;
  58                bm = 0x3 << bp;
  59                reg = __raw_readl(iomux_base + ofs);
  60                reg &= ~bm;
  61                reg |= PAD_MA(pad) << bp;
  62                __raw_writel(reg, iomux_base + ofs);
  63        }
  64        /* vol */
  65        if (PAD_VOL_VALID(pad)) {
  66                bp = PAD_PIN(pad) % 8 * 4 + 2;
  67                if (PAD_VOL(pad))
  68                        __mxs_setl(1 << bp, iomux_base + ofs);
  69                else
  70                        __mxs_clrl(1 << bp, iomux_base + ofs);
  71        }
  72
  73        /* pull */
  74        if (PAD_PULL_VALID(pad)) {
  75                ofs = cpu_is_mx23() ? 0x400 : 0x600;
  76                ofs += PAD_BANK(pad) * 0x10;
  77                bp = PAD_PIN(pad);
  78                if (PAD_PULL(pad))
  79                        __mxs_setl(1 << bp, iomux_base + ofs);
  80                else
  81                        __mxs_clrl(1 << bp, iomux_base + ofs);
  82        }
  83
  84        return 0;
  85}
  86
  87int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count)
  88{
  89        const iomux_cfg_t *p = pad_list;
  90        int i;
  91        int ret;
  92
  93        for (i = 0; i < count; i++) {
  94                ret = mxs_iomux_setup_pad(*p);
  95                if (ret)
  96                        return ret;
  97                p++;
  98        }
  99
 100        return 0;
 101}
 102