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/*
* 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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