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/*
* Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*
* 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/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <mach/pinctrl.h>
#include "regs-pinctrl.h"
#define PINCTRL_BASE_ADDR IO_ADDRESS(PINCTRL_PHYS_ADDR)
static int
mx28_gpio_direction(struct mxs_gpio_port *port, int pin, unsigned int input)
{
void __iomem *base = PINCTRL_BASE_ADDR + 0x10 * port->id;
if (input)
__raw_writel(1 << pin, base + HW_PINCTRL_DOE0_CLR);
else
__raw_writel(1 << pin, base + HW_PINCTRL_DOE0_SET);
return 0;
}
static int mx28_gpio_get(struct mxs_gpio_port *port, int pin)
{
unsigned int data;
void __iomem *base = PINCTRL_BASE_ADDR + 0x10 * port->id;
data = __raw_readl(base + HW_PINCTRL_DIN0);
return data & (1 << pin);
}
static void mx28_gpio_set(struct mxs_gpio_port *port, int pin, int data)
{
void __iomem *base = PINCTRL_BASE_ADDR + 0x10 * port->id;
if (data)
__raw_writel(1 << pin, base + HW_PINCTRL_DOUT0_SET);
else
__raw_writel(1 << pin, base + HW_PINCTRL_DOUT0_CLR);
}
static unsigned int mx28_gpio_irq_stat(struct mxs_gpio_port *port)
{
unsigned int mask;
void __iomem *base = PINCTRL_BASE_ADDR + 0x10 * port->id;
mask = __raw_readl(base + HW_PINCTRL_IRQSTAT0);
mask &= __raw_readl(base + HW_PINCTRL_IRQEN0);
return mask;
}
static int
mx28_gpio_set_irq_type(struct mxs_gpio_port *port, int pin, unsigned int type)
{
unsigned int level, pol;
void __iomem *base = PINCTRL_BASE_ADDR + 0x10 * port->id;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
level = 0;
pol = 1;
break;
case IRQ_TYPE_EDGE_FALLING:
level = 0;
pol = 0;
break;
case IRQ_TYPE_LEVEL_HIGH:
level = 1;
pol = 1;
break;
case IRQ_TYPE_LEVEL_LOW:
level = 1;
pol = 0;
break;
default:
pr_debug("%s: Incorrect GPIO interrupt type 0x%x\n",
__func__, type);
return -ENXIO;
}
if (level)
__raw_writel(1 << pin, base + HW_PINCTRL_IRQLEVEL0_SET);
else
__raw_writel(1 << pin, base + HW_PINCTRL_IRQLEVEL0_CLR);
if (pol)
__raw_writel(1 << pin, base + HW_PINCTRL_IRQPOL0_SET);
else
__raw_writel(1 << pin, base + HW_PINCTRL_IRQPOL0_CLR);
return 0;
}
static void mx28_gpio_unmask_irq(struct mxs_gpio_port *port, int pin)
{
void __iomem *base = PINCTRL_BASE_ADDR + 0x10 * port->id;
__raw_writel(1 << pin, base + HW_PINCTRL_IRQEN0_SET);
}
static void mx28_gpio_mask_irq(struct mxs_gpio_port *port, int pin)
{
void __iomem *base = PINCTRL_BASE_ADDR + 0x10 * port->id;
__raw_writel(1 << pin, base + HW_PINCTRL_IRQEN0_CLR);
}
static void mx28_gpio_ack_irq(struct mxs_gpio_port *port, int pin)
{
unsigned int mask;
void __iomem *base = PINCTRL_BASE_ADDR + 0x10 * port->id;
mask = 1 << pin;
if (mask)
__raw_writel(mask, base + HW_PINCTRL_IRQSTAT0_CLR);
}
static struct mxs_gpio_port mx28_gpios[] = {
{
.irq = IRQ_GPIO0,
},
{
.irq = IRQ_GPIO1,
},
{
.irq = IRQ_GPIO2,
},
{
.irq = IRQ_GPIO3,
},
{
.irq = IRQ_GPIO4,
},
};
static struct mxs_gpio_chip mx28_gpio_chip = {
.set_dir = mx28_gpio_direction,
.get = mx28_gpio_get,
.set = mx28_gpio_set,
.get_irq_stat = mx28_gpio_irq_stat,
.set_irq_type = mx28_gpio_set_irq_type,
.unmask_irq = mx28_gpio_unmask_irq,
.mask_irq = mx28_gpio_mask_irq,
.ack_irq = mx28_gpio_ack_irq,
};
int __init mx28_gpio_init(void)
{
int i;
unsigned int reg;
if (__raw_readl(PINCTRL_BASE_ADDR + HW_PINCTRL_CTRL_CLR) &
BM_PINCTRL_CTRL_SFTRST) {
__raw_writel(BM_PINCTRL_CTRL_SFTRST,
PINCTRL_BASE_ADDR + HW_PINCTRL_CTRL_CLR);
for (i = 0; i < 10000; i++) {
if (!(__raw_readl(PINCTRL_BASE_ADDR + HW_PINCTRL_CTRL) &
BM_PINCTRL_CTRL_SFTRST))
break;
udelay(2);
}
if (i >= 10000)
return -EFAULT;
__raw_writel(BM_PINCTRL_CTRL_CLKGATE,
PINCTRL_BASE_ADDR + HW_PINCTRL_CTRL_CLR);
}
reg = __raw_readl(PINCTRL_BASE_ADDR + HW_PINCTRL_CTRL);
for (i = 0; i < ARRAY_SIZE(mx28_gpios); i++) {
void __iomem *base = PINCTRL_BASE_ADDR + 0x10 * i;
if (!(reg & (BM_PINCTRL_CTRL_PRESENT0 << i)))
continue;
mxs_set_gpio_chip(&mx28_gpios[i], &mx28_gpio_chip);
mx28_gpios[i].id = i;
__raw_writel(0, base + HW_PINCTRL_IRQEN0);
__raw_writel(0xFFFFFFFF, base + HW_PINCTRL_PIN2IRQ0);
mx28_gpios[i].child_irq = MXS_GPIO_IRQ_START +
(i * PINS_PER_BANK);
mxs_add_gpio_port(&mx28_gpios[i]);
}
return 0;
}
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