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/*
* Copyright 2004-2006 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 <mach/hardware.h>
#include <asm/mach/map.h>
#include <mach/iomux-v3.h>
#define IOMUX_BASE IO_ADDRESS(IOMUXC_BASE_ADDR)
static unsigned long iomux_v3_pad_alloc_map[0x200 / BITS_PER_LONG];
/*
* setups a single pin:
* - reserves the pin so that it is not claimed by another driver
* - setups the iomux according to the configuration
*/
int mxc_iomux_v3_setup_pad(struct pad_desc *pad)
{
unsigned int pad_ofs = pad->pad_ctrl_ofs;
if (test_and_set_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map))
return -EBUSY;
if (pad->mux_ctrl_ofs)
__raw_writel(pad->mux_mode, IOMUX_BASE + pad->mux_ctrl_ofs);
if (pad->select_input_ofs)
__raw_writel(pad->select_input,
IOMUX_BASE + pad->select_input_ofs);
if (!(pad->pad_ctrl & NO_PAD_CTRL))
__raw_writel(pad->pad_ctrl, IOMUX_BASE + pad->pad_ctrl_ofs);
return 0;
}
EXPORT_SYMBOL(mxc_iomux_v3_setup_pad);
int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count)
{
struct pad_desc *p = pad_list;
int i;
int ret;
for (i = 0; i < count; i++) {
ret = mxc_iomux_v3_setup_pad(p);
if (ret)
goto setup_error;
p++;
}
return 0;
setup_error:
mxc_iomux_v3_release_multiple_pads(pad_list, i);
return ret;
}
EXPORT_SYMBOL(mxc_iomux_v3_setup_multiple_pads);
void mxc_iomux_v3_release_pad(struct pad_desc *pad)
{
unsigned int pad_ofs = pad->pad_ctrl_ofs;
clear_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map);
}
EXPORT_SYMBOL(mxc_iomux_v3_release_pad);
void mxc_iomux_v3_release_multiple_pads(struct pad_desc *pad_list, int count)
{
struct pad_desc *p = pad_list;
int i;
for (i = 0; i < count; i++) {
mxc_iomux_v3_release_pad(p);
p++;
}
}
EXPORT_SYMBOL(mxc_iomux_v3_release_multiple_pads);
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