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; |
|
}
|
|
|