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Tip revision: 52addcf9d6669fa439387610bc65c92fa0980cef authored by Linus Torvalds on 25 August 2014, 22:36:20 UTC
Linux 3.17-rc2
Linux 3.17-rc2
Tip revision: 52addcf
gpio-sa1100.c
/*
* linux/arch/arm/mach-sa1100/gpio.c
*
* Generic SA-1100 GPIO handling
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
{
return GPLR & GPIO_GPIO(offset);
}
static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
if (value)
GPSR = GPIO_GPIO(offset);
else
GPCR = GPIO_GPIO(offset);
}
static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
{
unsigned long flags;
local_irq_save(flags);
GPDR &= ~GPIO_GPIO(offset);
local_irq_restore(flags);
return 0;
}
static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
{
unsigned long flags;
local_irq_save(flags);
sa1100_gpio_set(chip, offset, value);
GPDR |= GPIO_GPIO(offset);
local_irq_restore(flags);
return 0;
}
static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
{
return offset < 11 ? (IRQ_GPIO0 + offset) : (IRQ_GPIO11 - 11 + offset);
}
static struct gpio_chip sa1100_gpio_chip = {
.label = "gpio",
.direction_input = sa1100_direction_input,
.direction_output = sa1100_direction_output,
.set = sa1100_gpio_set,
.get = sa1100_gpio_get,
.to_irq = sa1100_to_irq,
.base = 0,
.ngpio = GPIO_MAX + 1,
};
void __init sa1100_init_gpio(void)
{
gpiochip_add(&sa1100_gpio_chip);
}