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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 <common.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/iomux.h>
#include <asm/arch/imx-regs.h>
#if defined(CONFIG_MX23)
#define DRIVE_OFFSET 0x200
#define PULL_OFFSET 0x400
#elif defined(CONFIG_MX28)
#define DRIVE_OFFSET 0x300
#define PULL_OFFSET 0x600
#else
#error "Please select CONFIG_MX23 or CONFIG_MX28"
#endif
/*
* configures a single pad in the iomuxer
*/
int mxs_iomux_setup_pad(iomux_cfg_t pad)
{
u32 reg, ofs, bp, bm;
void *iomux_base = (void *)MXS_PINCTRL_BASE;
struct mxs_register_32 *mxs_reg;
/* muxsel */
ofs = 0x100;
ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
bp = PAD_PIN(pad) % 16 * 2;
bm = 0x3 << bp;
reg = readl(iomux_base + ofs);
reg &= ~bm;
reg |= PAD_MUXSEL(pad) << bp;
writel(reg, iomux_base + ofs);
/* drive */
ofs = DRIVE_OFFSET;
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 = readl(iomux_base + ofs);
reg &= ~bm;
reg |= PAD_MA(pad) << bp;
writel(reg, iomux_base + ofs);
}
/* vol */
if (PAD_VOL_VALID(pad)) {
bp = PAD_PIN(pad) % 8 * 4 + 2;
mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs);
if (PAD_VOL(pad))
writel(1 << bp, &mxs_reg->reg_set);
else
writel(1 << bp, &mxs_reg->reg_clr);
}
/* pull */
if (PAD_PULL_VALID(pad)) {
ofs = PULL_OFFSET;
ofs += PAD_BANK(pad) * 0x10;
bp = PAD_PIN(pad);
mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs);
if (PAD_PULL(pad))
writel(1 << bp, &mxs_reg->reg_set);
else
writel(1 << bp, &mxs_reg->reg_clr);
}
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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