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/*
* File: arch/blackfin/mach-bf548/gpio.c
* Based on:
* Author: Michael Hennerich (hennerich@blackfin.uclinux.org)
*
* Created:
* Description: GPIO Abstraction Layer
*
* Modified:
* Copyright 2007 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* 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, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/module.h>
#include <linux/err.h>
#include <asm/blackfin.h>
#include <asm/gpio.h>
#include <linux/irq.h>
static struct gpio_port_t *gpio_array[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
(struct gpio_port_t *) PORTA_FER,
(struct gpio_port_t *) PORTB_FER,
(struct gpio_port_t *) PORTC_FER,
(struct gpio_port_t *) PORTD_FER,
(struct gpio_port_t *) PORTE_FER,
(struct gpio_port_t *) PORTF_FER,
(struct gpio_port_t *) PORTG_FER,
(struct gpio_port_t *) PORTH_FER,
(struct gpio_port_t *) PORTI_FER,
(struct gpio_port_t *) PORTJ_FER,
};
static unsigned short reserved_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
inline int check_gpio(unsigned short gpio)
{
if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15 \
|| gpio == GPIO_PH14 || gpio == GPIO_PH15 \
|| gpio > MAX_BLACKFIN_GPIOS)
return -EINVAL;
return 0;
}
static void port_setup(unsigned short gpio, unsigned short usage)
{
if (usage == GPIO_USAGE) {
if (gpio_array[gpio_bank(gpio)]->port_fer & gpio_bit(gpio))
printk(KERN_WARNING "bfin-gpio: Possible Conflict with Peripheral "
"usage and GPIO %d detected!\n", gpio);
gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
} else
gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
SSYNC();
}
static int __init bfin_gpio_init(void)
{
int i;
printk(KERN_INFO "Blackfin GPIO Controller\n");
for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE)
reserved_map[gpio_bank(i)] = 0;
return 0;
}
arch_initcall(bfin_gpio_init);
/***********************************************************
*
* FUNCTIONS: Blackfin GPIO Driver
*
* INPUTS/OUTPUTS:
* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
*
*
* DESCRIPTION: Blackfin GPIO Driver API
*
* CAUTION:
*************************************************************
* MODIFICATION HISTORY :
**************************************************************/
int gpio_request(unsigned short gpio, const char *label)
{
unsigned long flags;
if (check_gpio(gpio) < 0)
return -EINVAL;
local_irq_save(flags);
if (unlikely(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved!\n", gpio);
dump_stack();
local_irq_restore(flags);
return -EBUSY;
}
reserved_map[gpio_bank(gpio)] |= gpio_bit(gpio);
local_irq_restore(flags);
port_setup(gpio, GPIO_USAGE);
return 0;
}
EXPORT_SYMBOL(gpio_request);
void gpio_free(unsigned short gpio)
{
unsigned long flags;
if (check_gpio(gpio) < 0)
return;
local_irq_save(flags);
if (unlikely(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio);
dump_stack();
local_irq_restore(flags);
return;
}
reserved_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_free);
void gpio_direction_input(unsigned short gpio)
{
unsigned long flags;
BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_direction_input);
void gpio_direction_output(unsigned short gpio)
{
unsigned long flags;
BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
local_irq_save(flags);
gpio_array[gpio_bank(gpio)]->port_inen &= ~gpio_bit(gpio);
gpio_array[gpio_bank(gpio)]->port_dir_set = gpio_bit(gpio);
local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_direction_output);
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