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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 <asm/io.h>
#include <mach/imx-regs.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
extern void *imx_gpio_base[];
extern int imx_gpio_count;
static void *gpio_get_base(unsigned gpio)
{
if (gpio >= imx_gpio_count)
return 0;
return imx_gpio_base[gpio / 32];
}
void gpio_set_value(unsigned gpio, int value)
{
void *base = gpio_get_base(gpio);
int shift = gpio % 32;
u32 val;
if (!base)
return;
val = readl(base + GPIO_DR);
if (value)
val |= 1 << shift;
else
val &= ~(1 << shift);
writel(val, base + GPIO_DR);
}
int gpio_direction_input(unsigned gpio)
{
void *base = gpio_get_base(gpio);
int shift = gpio % 32;
u32 val;
if (!base)
return -EINVAL;
val = readl(base + GPIO_GDIR);
val &= ~(1 << shift);
writel(val, base + GPIO_GDIR);
return 0;
}
int gpio_direction_output(unsigned gpio, int value)
{
void *base = gpio_get_base(gpio);
int shift = gpio % 32;
u32 val;
if (!base)
return -EINVAL;
gpio_set_value(gpio, value);
val = readl(base + GPIO_GDIR);
val |= 1 << shift;
writel(val, base + GPIO_GDIR);
return 0;
}
int gpio_get_value(unsigned gpio)
{
void *base = gpio_get_base(gpio);
int shift = gpio % 32;
u32 val;
if (!base)
return -EINVAL;
val = readl(base + GPIO_PSR);
return val & (1 << shift) ? 1 : 0;
}
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