1. 根目录:
2. arch
3. arm
4. mach-mxs
5. 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;
}