103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
/*
|
|
* Copyright (C) 2012 Stefan Roese <sr@denx.de>
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/*
|
|
* Driver for SPEAr600 GPIO controller
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/arch/hardware.h>
|
|
#include <asm/gpio.h>
|
|
#include <asm/io.h>
|
|
#include <errno.h>
|
|
|
|
static int gpio_direction(unsigned gpio,
|
|
enum gpio_direction direction)
|
|
{
|
|
struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
|
|
u32 val;
|
|
|
|
val = readl(®s->gpiodir);
|
|
|
|
if (direction == GPIO_DIRECTION_OUT)
|
|
val |= 1 << gpio;
|
|
else
|
|
val &= ~(1 << gpio);
|
|
|
|
writel(val, ®s->gpiodir);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gpio_set_value(unsigned gpio, int value)
|
|
{
|
|
struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
|
|
|
|
writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gpio_get_value(unsigned gpio)
|
|
{
|
|
struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
|
|
u32 val;
|
|
|
|
val = readl(®s->gpiodata[DATA_REG_ADDR(gpio)]);
|
|
|
|
return !!val;
|
|
}
|
|
|
|
int gpio_request(unsigned gpio, const char *label)
|
|
{
|
|
if (gpio >= SPEAR_GPIO_COUNT)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gpio_free(unsigned gpio)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void gpio_toggle_value(unsigned gpio)
|
|
{
|
|
gpio_set_value(gpio, !gpio_get_value(gpio));
|
|
}
|
|
|
|
int gpio_direction_input(unsigned gpio)
|
|
{
|
|
return gpio_direction(gpio, GPIO_DIRECTION_IN);
|
|
}
|
|
|
|
int gpio_direction_output(unsigned gpio, int value)
|
|
{
|
|
int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
gpio_set_value(gpio, value);
|
|
return 0;
|
|
}
|