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iomux.c

/*
 * Copyright 2004-2006,2010 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
 * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
 *                       <armlinux@phytec.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/gpio.h>

#include <asm/mach/map.h>

#include <mach/mxs.h>
#include <mach/iomux.h>

/*
 * configures a single pad in the iomuxer
 */
int mxs_iomux_setup_pad(iomux_cfg_t pad)
{
      u32 reg, ofs, bp, bm;
      void __iomem *iomux_base = MXS_IO_ADDRESS(MXS_PINCTRL_BASE_ADDR);

      /* muxsel */
      ofs = 0x100;
      ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
      bp = PAD_PIN(pad) % 16 * 2;
      bm = 0x3 << bp;
      reg = __raw_readl(iomux_base + ofs);
      reg &= ~bm;
      reg |= PAD_MUXSEL(pad) << bp;
      __raw_writel(reg, iomux_base + ofs);

      /* drive */
      ofs = cpu_is_mx23() ? 0x200 : 0x300;
      ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10;
      /* mA */
      if (PAD_MA_VALID(pad)) {
            bp = PAD_PIN(pad) % 8 * 4;
            bm = 0x3 << bp;
            reg = __raw_readl(iomux_base + ofs);
            reg &= ~bm;
            reg |= PAD_MA(pad) << bp;
            __raw_writel(reg, iomux_base + ofs);
      }
      /* vol */
      if (PAD_VOL_VALID(pad)) {
            bp = PAD_PIN(pad) % 8 * 4 + 2;
            if (PAD_VOL(pad))
                  __mxs_setl(1 << bp, iomux_base + ofs);
            else
                  __mxs_clrl(1 << bp, iomux_base + ofs);
      }

      /* pull */
      if (PAD_PULL_VALID(pad)) {
            ofs = cpu_is_mx23() ? 0x400 : 0x600;
            ofs += PAD_BANK(pad) * 0x10;
            bp = PAD_PIN(pad);
            if (PAD_PULL(pad))
                  __mxs_setl(1 << bp, iomux_base + ofs);
            else
                  __mxs_clrl(1 << bp, iomux_base + ofs);
      }

      return 0;
}

int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count)
{
      const iomux_cfg_t *p = pad_list;
      int i;
      int ret;

      for (i = 0; i < count; i++) {
            ret = mxs_iomux_setup_pad(*p);
            if (ret)
                  return ret;
            p++;
      }

      return 0;
}

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