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/* linux/arch/arm/plat-s3c/gpio.c
 *
 * Copyright 2008 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>
 *	http://armlinux.simtec.co.uk/
 *
 * S3C series GPIO core
 *
 * 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/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/gpio.h>

#include <plat/gpio-core.h>

/* Default routines for controlling GPIO, based on the original S3C24XX
 * GPIO functions which deal with the case where each gpio bank of the
 * chip is as following:
 *
 * base + 0x00: Control register, 2 bits per gpio
 *	        gpio n: 2 bits starting at (2*n)
 *		00 = input, 01 = output, others mean special-function
 * base + 0x04: Data register, 1 bit per gpio
 *		bit n: data bit n
*/

static int s3c_gpiolib_input(struct gpio_chip *chip, unsigned offset)
{
	struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
	void __iomem *base = ourchip->base;
	unsigned long flags;
	unsigned long con;

	local_irq_save(flags);

	con = __raw_readl(base + 0x00);
	con &= ~(3 << (offset * 2));

	__raw_writel(con, base + 0x00);

	local_irq_restore(flags);
	return 0;
}

static int s3c_gpiolib_output(struct gpio_chip *chip,
			      unsigned offset, int value)
{
	struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
	void __iomem *base = ourchip->base;
	unsigned long flags;
	unsigned long dat;
	unsigned long con;

	local_irq_save(flags);

	dat = __raw_readl(base + 0x04);
	dat &= ~(1 << offset);
	if (value)
		dat |= 1 << offset;
	__raw_writel(dat, base + 0x04);

	con = __raw_readl(base + 0x00);
	con &= ~(3 << (offset * 2));
	con |= 1 << (offset * 2);

	__raw_writel(con, base + 0x00);
	__raw_writel(dat, base + 0x04);

	local_irq_restore(flags);
	return 0;
}

static void s3c_gpiolib_set(struct gpio_chip *chip,
			    unsigned offset, int value)
{
	struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
	void __iomem *base = ourchip->base;
	unsigned long flags;
	unsigned long dat;

	local_irq_save(flags);

	dat = __raw_readl(base + 0x04);
	dat &= ~(1 << offset);
	if (value)
		dat |= 1 << offset;
	__raw_writel(dat, base + 0x04);

	local_irq_restore(flags);
}

static int s3c_gpiolib_get(struct gpio_chip *chip, unsigned offset)
{
	struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
	unsigned long val;

	val = __raw_readl(ourchip->base + 0x04);
	val >>= offset;
	val &= 1;

	return val;
}

__init void s3c_gpiolib_add(struct s3c_gpio_chip *chip)
{
	struct gpio_chip *gc = &chip->chip;

	BUG_ON(!chip->base);
	BUG_ON(!gc->label);
	BUG_ON(!gc->ngpio);

	if (!gc->direction_input)
		gc->direction_input = s3c_gpiolib_input;
	if (!gc->direction_output)
		gc->direction_output = s3c_gpiolib_output;
	if (!gc->set)
		gc->set = s3c_gpiolib_set;
	if (!gc->get)
		gc->get = s3c_gpiolib_get;

	/* gpiochip_add() prints own failure message on error. */
	gpiochip_add(gc);
}