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/*
* arch/arm/mach-imx/gpio.c
*
* author: Sascha Hauer
* Created: april 20th, 2004
* Copyright: Synertronixx GmbH
*
* Common code for i.MX machines
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <common.h>
#include <errno.h>
#include <io.h>
#include <mach/imx-regs.h>
#include <gpio.h>
#include <init.h>
#if defined CONFIG_ARCH_IMX1 || defined CONFIG_ARCH_IMX21 || defined CONFIG_ARCH_IMX27
#define GPIO_DR 0x1c
#define GPIO_GDIR 0x00
#define GPIO_PSR 0x24
#define GPIO_ICR1 0x28
#define GPIO_ICR2 0x2C
#define GPIO_IMR 0x30
#define GPIO_ISR 0x34
#else
#define GPIO_DR 0x00
#define GPIO_GDIR 0x04
#define GPIO_PSR 0x08
#define GPIO_ICR1 0x0C
#define GPIO_ICR2 0x10
#define GPIO_IMR 0x14
#define GPIO_ISR 0x18
#define GPIO_ISR 0x18
#endif
struct imx_gpio_chip {
void __iomem *base;
struct gpio_chip chip;
};
static void imx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
{
struct imx_gpio_chip *imxgpio = container_of(chip, struct imx_gpio_chip, chip);
void __iomem *base = imxgpio->base;
u32 val;
if (!base)
return;
val = readl(base + GPIO_DR);
if (value)
val |= 1 << gpio;
else
val &= ~(1 << gpio);
writel(val, base + GPIO_DR);
}
static int imx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
struct imx_gpio_chip *imxgpio = container_of(chip, struct imx_gpio_chip, chip);
void __iomem *base = imxgpio->base;
u32 val;
if (!base)
return -EINVAL;
val = readl(base + GPIO_GDIR);
val &= ~(1 << gpio);
writel(val, base + GPIO_GDIR);
return 0;
}
static int imx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value)
{
struct imx_gpio_chip *imxgpio = container_of(chip, struct imx_gpio_chip, chip);
void __iomem *base = imxgpio->base;
u32 val;
gpio_set_value(gpio + chip->base, value);
val = readl(base + GPIO_GDIR);
val |= 1 << gpio;
writel(val, base + GPIO_GDIR);
return 0;
}
static int imx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
struct imx_gpio_chip *imxgpio = container_of(chip, struct imx_gpio_chip, chip);
void __iomem *base = imxgpio->base;
u32 val;
val = readl(base + GPIO_PSR);
return val & (1 << gpio) ? 1 : 0;
}
static struct gpio_ops imx_gpio_ops = {
.direction_input = imx_gpio_direction_input,
.direction_output = imx_gpio_direction_output,
.get = imx_gpio_get_value,
.set = imx_gpio_set_value,
};
static int imx_gpio_probe(struct device_d *dev)
{
struct imx_gpio_chip *imxgpio;
imxgpio = xzalloc(sizeof(*imxgpio));
imxgpio->base = dev_request_mem_region(dev, 0);
imxgpio->chip.ops = &imx_gpio_ops;
imxgpio->chip.base = -1;
imxgpio->chip.ngpio = 32;
imxgpio->chip.dev = dev;
gpiochip_add(&imxgpio->chip);
dev_info(dev, "probed gpiochip%d with base %d\n", dev->id, imxgpio->chip.base);
return 0;
}
static struct driver_d imx_gpio_driver = {
.name = "imx-gpio",
.probe = imx_gpio_probe,
};
static int imx_gpio_add(void)
{
register_driver(&imx_gpio_driver);
return 0;
}
coredevice_initcall(imx_gpio_add);
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