You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
2.1 KiB
91 lines
2.1 KiB
/*
|
|
* gpio.c - GPIO handling
|
|
*
|
|
* Copyright (C) 2008 Hugo Villeneuve <hugo@hugovil.com>
|
|
*
|
|
* Based on davinci gpio code from the Linux kernel, original copyright follows:
|
|
* Copyright (c) 2006-2007 David Brownell
|
|
* Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com>
|
|
*
|
|
* 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 St, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "common.h"
|
|
#include "davinci.h"
|
|
#include "gpio.h"
|
|
|
|
static struct gpio_controller *
|
|
gpio_to_controller(unsigned gpio)
|
|
{
|
|
void *ptr;
|
|
|
|
if (gpio < 32 * 1)
|
|
ptr = (void *) DAVINCI_GPIO_BASE + 0x10;
|
|
else if (gpio < 32 * 2)
|
|
ptr = (void *) DAVINCI_GPIO_BASE + 0x38;
|
|
else if (gpio < 32 * 3)
|
|
ptr = (void *) DAVINCI_GPIO_BASE + 0x60;
|
|
else if (gpio < 32 * 4)
|
|
ptr = (void *) DAVINCI_GPIO_BASE + 0x88;
|
|
else
|
|
ptr = NULL;
|
|
|
|
return ptr;
|
|
}
|
|
|
|
static inline uint32_t
|
|
gpio_mask(unsigned gpio)
|
|
{
|
|
return 1 << (gpio % 32);
|
|
}
|
|
|
|
int
|
|
gpio_direction_in(unsigned gpio)
|
|
{
|
|
volatile struct gpio_controller *g = gpio_to_controller(gpio);
|
|
uint32_t mask = gpio_mask(gpio);
|
|
|
|
g->dir |= mask;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
gpio_direction_out(unsigned gpio, int initial_value)
|
|
{
|
|
volatile struct gpio_controller *g = gpio_to_controller(gpio);
|
|
uint32_t mask = gpio_mask(gpio);
|
|
|
|
if (initial_value)
|
|
g->set_data = mask;
|
|
else
|
|
g->clr_data = mask;
|
|
|
|
g->dir &= ~mask;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
gpio_set(unsigned gpio, int state)
|
|
{
|
|
volatile struct gpio_controller *g = gpio_to_controller(gpio);
|
|
uint32_t mask = gpio_mask(gpio);
|
|
|
|
if (state)
|
|
g->set_data = mask;
|
|
else
|
|
g->clr_data = mask;
|
|
}
|
|
|