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/*
* Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.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/module.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <asm/hardware.h>
#include <asm/arch/gpio.h>
#include <asm/arch/iomux-mx3.h>
/*
* IOMUX register (base) addresses
*/
#define IOMUX_BASE IO_ADDRESS(IOMUXC_BASE_ADDR)
#define IOMUXINT_OBS1 (IOMUX_BASE + 0x000)
#define IOMUXINT_OBS2 (IOMUX_BASE + 0x004)
#define IOMUXGPR (IOMUX_BASE + 0x008)
#define IOMUXSW_MUX_CTL (IOMUX_BASE + 0x00C)
#define IOMUXSW_PAD_CTL (IOMUX_BASE + 0x154)
static DEFINE_SPINLOCK(gpio_mux_lock);
#define IOMUX_REG_MASK (IOMUX_PADNUM_MASK & ~0x3)
/*
* set the mode for a IOMUX pin.
*/
int mxc_iomux_mode(unsigned int pin_mode)
{
u32 reg, field, l, mode, ret = 0;
reg = IOMUXSW_MUX_CTL + (pin_mode & IOMUX_REG_MASK);
field = pin_mode & 0x3;
mode = (pin_mode & IOMUX_MODE_MASK) >> IOMUX_MODE_SHIFT;
pr_debug("%s: reg offset = 0x%x field = %d mode = 0x%02x\n",
__func__, (pin_mode & IOMUX_REG_MASK), field, mode);
spin_lock(&gpio_mux_lock);
l = __raw_readl(reg);
l &= ~(0xff << (field * 8));
l |= mode << (field * 8);
__raw_writel(l, reg);
spin_unlock(&gpio_mux_lock);
return ret;
}
EXPORT_SYMBOL(mxc_iomux_mode);
/*
* This function configures the pad value for a IOMUX pin.
*/
void mxc_iomux_set_pad(enum iomux_pins pin, u32 config)
{
u32 reg, field, l;
reg = IOMUXSW_PAD_CTL + (pin + 2) / 3;
field = (pin + 2) % 3;
pr_debug("%s: reg offset = 0x%x field = %d\n",
__func__, (pin + 2) / 3, field);
spin_lock(&gpio_mux_lock);
l = __raw_readl(reg);
l &= ~(0x1ff << (field * 9));
l |= config << (field * 9);
__raw_writel(l, reg);
spin_unlock(&gpio_mux_lock);
}
EXPORT_SYMBOL(mxc_iomux_set_pad);
/*
* This function enables/disables the general purpose function for a particular
* signal.
*/
void mxc_iomux_set_gpr(enum iomux_gp_func gp, bool en)
{
u32 l;
spin_lock(&gpio_mux_lock);
l = __raw_readl(IOMUXGPR);
if (en)
l |= gp;
else
l &= ~gp;
__raw_writel(l, IOMUXGPR);
spin_unlock(&gpio_mux_lock);
}
EXPORT_SYMBOL(mxc_iomux_set_gpr);
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