92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
/*
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* gpio.c - GPIO handling
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*
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* Copyright (C) 2008 Hugo Villeneuve <hugo@hugovil.com>
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*
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* Based on davinci gpio code from the Linux kernel, original copyright follows:
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* Copyright (c) 2006-2007 David Brownell
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* Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "common.h"
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#include "davinci.h"
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#include "gpio.h"
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static struct gpio_controller *
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gpio_to_controller(unsigned gpio)
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{
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void *ptr;
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if (gpio < 32 * 1)
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ptr = (void *) DAVINCI_GPIO_BASE + 0x10;
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else if (gpio < 32 * 2)
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ptr = (void *) DAVINCI_GPIO_BASE + 0x38;
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else if (gpio < 32 * 3)
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ptr = (void *) DAVINCI_GPIO_BASE + 0x60;
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else if (gpio < 32 * 4)
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ptr = (void *) DAVINCI_GPIO_BASE + 0x88;
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else
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ptr = NULL;
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return ptr;
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}
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static inline uint32_t
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gpio_mask(unsigned gpio)
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{
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return 1 << (gpio % 32);
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}
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int
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gpio_direction_in(unsigned gpio)
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{
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volatile struct gpio_controller *g = gpio_to_controller(gpio);
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uint32_t mask = gpio_mask(gpio);
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g->dir |= mask;
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return 0;
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}
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int
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gpio_direction_out(unsigned gpio, int initial_value)
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{
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volatile struct gpio_controller *g = gpio_to_controller(gpio);
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uint32_t mask = gpio_mask(gpio);
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if (initial_value)
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g->set_data = mask;
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else
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g->clr_data = mask;
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g->dir &= ~mask;
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return 0;
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}
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void
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gpio_set(unsigned gpio, int state)
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{
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volatile struct gpio_controller *g = gpio_to_controller(gpio);
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uint32_t mask = gpio_mask(gpio);
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if (state)
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g->set_data = mask;
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else
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g->clr_data = mask;
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}
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