Primary Bootloader (before u-boot) in sysmoBTSv2
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/*
* 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;
}