arch/powerpc/platforms/52xx/mpc52xx_gpio.c - maze/linux - Git at Google

 /*
  * MPC52xx gpio driver
  *
  * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
  *
  * 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.
  *
  * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */

 #include <linux/of.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/of_gpio.h>
 #include <linux/io.h>
 #include <linux/of_platform.h>

 #include <asm/gpio.h>
 #include <asm/mpc52xx.h>
 #include <sysdev/fsl_soc.h>

 static DEFINE_SPINLOCK(gpio_lock);

 struct mpc52xx_gpiochip {
 	struct of_mm_gpio_chip mmchip;
 	unsigned int shadow_dvo;
 	unsigned int shadow_gpioe;
 	unsigned int shadow_ddr;
 };

 /*
  * GPIO LIB API implementation for wakeup GPIOs.
  *
  * There's a maximum of 8 wakeup GPIOs. Which of these are available
  * for use depends on your board setup.
  *
  * 0 -> GPIO_WKUP_7
  * 1 -> GPIO_WKUP_6
  * 2 -> PSC6_1
  * 3 -> PSC6_0
  * 4 -> ETH_17
  * 5 -> PSC3_9
  * 6 -> PSC2_4
  * 7 -> PSC1_4
  *
  */
 static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
 {
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 	unsigned int ret;

 	ret = (in_8(&regs->wkup_ival) >> (7 - gpio)) & 1;

 	pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);

 	return ret;
 }

 static inline void
 __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 			struct mpc52xx_gpiochip, mmchip);
 	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;

 	if (val)
 		chip->shadow_dvo |= 1 << (7 - gpio);
 	else
 		chip->shadow_dvo &= ~(1 << (7 - gpio));

 	out_8(&regs->wkup_dvo, chip->shadow_dvo);
 }

 static void
 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&gpio_lock, flags);

 	__mpc52xx_wkup_gpio_set(gc, gpio, val);

 	spin_unlock_irqrestore(&gpio_lock, flags);

 	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 }

 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 {
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 			struct mpc52xx_gpiochip, mmchip);
 	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 	unsigned long flags;

 	spin_lock_irqsave(&gpio_lock, flags);

 	/* set the direction */
 	chip->shadow_ddr &= ~(1 << (7 - gpio));
 	out_8(&regs->wkup_ddr, chip->shadow_ddr);

 	/* and enable the pin */
 	chip->shadow_gpioe |= 1 << (7 - gpio);
 	out_8(&regs->wkup_gpioe, chip->shadow_gpioe);

 	spin_unlock_irqrestore(&gpio_lock, flags);

 	return 0;
 }

 static int
 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 			struct mpc52xx_gpiochip, mmchip);
 	unsigned long flags;

 	spin_lock_irqsave(&gpio_lock, flags);

 	__mpc52xx_wkup_gpio_set(gc, gpio, val);

 	/* Then set direction */
 	chip->shadow_ddr |= 1 << (7 - gpio);
 	out_8(&regs->wkup_ddr, chip->shadow_ddr);

 	/* Finally enable the pin */
 	chip->shadow_gpioe |= 1 << (7 - gpio);
 	out_8(&regs->wkup_gpioe, chip->shadow_gpioe);

 	spin_unlock_irqrestore(&gpio_lock, flags);

 	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);

 	return 0;
 }

 static int __devinit mpc52xx_wkup_gpiochip_probe(struct of_device *ofdev,
 					const struct of_device_id *match)
 {
 	struct mpc52xx_gpiochip *chip;
 	struct mpc52xx_gpio_wkup __iomem *regs;
 	struct of_gpio_chip *ofchip;
 	int ret;

 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	ofchip = &chip->mmchip.of_gc;

 	ofchip->gpio_cells          = 2;
 	ofchip->gc.ngpio            = 8;
 	ofchip->gc.direction_input  = mpc52xx_wkup_gpio_dir_in;
 	ofchip->gc.direction_output = mpc52xx_wkup_gpio_dir_out;
 	ofchip->gc.get              = mpc52xx_wkup_gpio_get;
 	ofchip->gc.set              = mpc52xx_wkup_gpio_set;

 	ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
 	if (ret)
 		return ret;

 	regs = chip->mmchip.regs;
 	chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
 	chip->shadow_ddr = in_8(&regs->wkup_ddr);
 	chip->shadow_dvo = in_8(&regs->wkup_dvo);

 	return 0;
 }

 static int mpc52xx_gpiochip_remove(struct of_device *ofdev)
 {
 	return -EBUSY;
 }

 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
 	{
 		.compatible = "fsl,mpc5200-gpio-wkup",
 	},
 	{}
 };

 static struct of_platform_driver mpc52xx_wkup_gpiochip_driver = {
 	.driver = {
 		.name = "gpio_wkup",
 		.owner = THIS_MODULE,
 		.of_match_table = mpc52xx_wkup_gpiochip_match,
 	},
 	.probe = mpc52xx_wkup_gpiochip_probe,
 	.remove = mpc52xx_gpiochip_remove,
 };

 /*
  * GPIO LIB API implementation for simple GPIOs
  *
  * There's a maximum of 32 simple GPIOs. Which of these are available
  * for use depends on your board setup.
  * The numbering reflects the bit numbering in the port registers:
  *
  *  0..1  > reserved
  *  2..3  > IRDA
  *  4..7  > ETHR
  *  8..11 > reserved
  * 12..15 > USB
  * 16..17 > reserved
  * 18..23 > PSC3
  * 24..27 > PSC2
  * 28..31 > PSC1
  */
 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
 {
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 	unsigned int ret;

 	ret = (in_be32(&regs->simple_ival) >> (31 - gpio)) & 1;

 	return ret;
 }

 static inline void
 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 			struct mpc52xx_gpiochip, mmchip);
 	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;

 	if (val)
 		chip->shadow_dvo |= 1 << (31 - gpio);
 	else
 		chip->shadow_dvo &= ~(1 << (31 - gpio));
 	out_be32(&regs->simple_dvo, chip->shadow_dvo);
 }

 static void
 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&gpio_lock, flags);

 	__mpc52xx_simple_gpio_set(gc, gpio, val);

 	spin_unlock_irqrestore(&gpio_lock, flags);

 	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 }

 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 {
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 			struct mpc52xx_gpiochip, mmchip);
 	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 	unsigned long flags;

 	spin_lock_irqsave(&gpio_lock, flags);

 	/* set the direction */
 	chip->shadow_ddr &= ~(1 << (31 - gpio));
 	out_be32(&regs->simple_ddr, chip->shadow_ddr);

 	/* and enable the pin */
 	chip->shadow_gpioe |= 1 << (31 - gpio);
 	out_be32(&regs->simple_gpioe, chip->shadow_gpioe);

 	spin_unlock_irqrestore(&gpio_lock, flags);

 	return 0;
 }

 static int
 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 			struct mpc52xx_gpiochip, mmchip);
 	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 	unsigned long flags;

 	spin_lock_irqsave(&gpio_lock, flags);

 	/* First set initial value */
 	__mpc52xx_simple_gpio_set(gc, gpio, val);

 	/* Then set direction */
 	chip->shadow_ddr |= 1 << (31 - gpio);
 	out_be32(&regs->simple_ddr, chip->shadow_ddr);

 	/* Finally enable the pin */
 	chip->shadow_gpioe |= 1 << (31 - gpio);
 	out_be32(&regs->simple_gpioe, chip->shadow_gpioe);

 	spin_unlock_irqrestore(&gpio_lock, flags);

 	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);

 	return 0;
 }

 static int __devinit mpc52xx_simple_gpiochip_probe(struct of_device *ofdev,
 					const struct of_device_id *match)
 {
 	struct mpc52xx_gpiochip *chip;
 	struct of_gpio_chip *ofchip;
 	struct mpc52xx_gpio __iomem *regs;
 	int ret;

 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	ofchip = &chip->mmchip.of_gc;

 	ofchip->gpio_cells          = 2;
 	ofchip->gc.ngpio            = 32;
 	ofchip->gc.direction_input  = mpc52xx_simple_gpio_dir_in;
 	ofchip->gc.direction_output = mpc52xx_simple_gpio_dir_out;
 	ofchip->gc.get              = mpc52xx_simple_gpio_get;
 	ofchip->gc.set              = mpc52xx_simple_gpio_set;

 	ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
 	if (ret)
 		return ret;

 	regs = chip->mmchip.regs;
 	chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
 	chip->shadow_ddr = in_be32(&regs->simple_ddr);
 	chip->shadow_dvo = in_be32(&regs->simple_dvo);

 	return 0;
 }

 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
 	{
 		.compatible = "fsl,mpc5200-gpio",
 	},
 	{}
 };

 static struct of_platform_driver mpc52xx_simple_gpiochip_driver = {
 	.driver = {
 		.name = "gpio",
 		.owner = THIS_MODULE,
 		.of_match_table = mpc52xx_simple_gpiochip_match,
 	},
 	.probe = mpc52xx_simple_gpiochip_probe,
 	.remove = mpc52xx_gpiochip_remove,
 };

 static int __init mpc52xx_gpio_init(void)
 {
 	if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver))
 		printk(KERN_ERR "Unable to register wakeup GPIO driver\n");

 	if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver))
 		printk(KERN_ERR "Unable to register simple GPIO driver\n");

 	return 0;
 }


 /* Make sure we get initialised before anyone else tries to use us */
 subsys_initcall(mpc52xx_gpio_init);

 /* No exit call at the moment as we cannot unregister of gpio chips */

 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
 MODULE_LICENSE("GPL v2");
	/*
	* MPC52xx gpio driver
	*
	* Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
	*
	* 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.
	*
	* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/of.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/of_gpio.h>
	#include <linux/io.h>
	#include <linux/of_platform.h>

	#include <asm/gpio.h>
	#include <asm/mpc52xx.h>
	#include <sysdev/fsl_soc.h>

	static DEFINE_SPINLOCK(gpio_lock);

	struct mpc52xx_gpiochip {
	struct of_mm_gpio_chip mmchip;
	unsigned int shadow_dvo;
	unsigned int shadow_gpioe;
	unsigned int shadow_ddr;
	};

	/*
	* GPIO LIB API implementation for wakeup GPIOs.
	*
	* There's a maximum of 8 wakeup GPIOs. Which of these are available
	* for use depends on your board setup.
	*
	* 0 -> GPIO_WKUP_7
	* 1 -> GPIO_WKUP_6
	* 2 -> PSC6_1
	* 3 -> PSC6_0
	* 4 -> ETH_17
	* 5 -> PSC3_9
	* 6 -> PSC2_4
	* 7 -> PSC1_4
	*
	*/
	static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
	{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
	unsigned int ret;

	ret = (in_8(&regs->wkup_ival) >> (7 - gpio)) & 1;

	pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);

	return ret;
	}

	static inline void
	__mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
	{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
	struct mpc52xx_gpiochip, mmchip);
	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;

	if (val)
	chip->shadow_dvo \|= 1 << (7 - gpio);
	else
	chip->shadow_dvo &= ~(1 << (7 - gpio));

	out_8(&regs->wkup_dvo, chip->shadow_dvo);
	}

	static void
	mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
	{
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	__mpc52xx_wkup_gpio_set(gc, gpio, val);

	spin_unlock_irqrestore(&gpio_lock, flags);

	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
	}

	static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
	{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
	struct mpc52xx_gpiochip, mmchip);
	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	/* set the direction */
	chip->shadow_ddr &= ~(1 << (7 - gpio));
	out_8(&regs->wkup_ddr, chip->shadow_ddr);

	/* and enable the pin */
	chip->shadow_gpioe \|= 1 << (7 - gpio);
	out_8(&regs->wkup_gpioe, chip->shadow_gpioe);

	spin_unlock_irqrestore(&gpio_lock, flags);

	return 0;
	}

	static int
	mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
	{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
	struct mpc52xx_gpiochip, mmchip);
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	__mpc52xx_wkup_gpio_set(gc, gpio, val);

	/* Then set direction */
	chip->shadow_ddr \|= 1 << (7 - gpio);
	out_8(&regs->wkup_ddr, chip->shadow_ddr);

	/* Finally enable the pin */
	chip->shadow_gpioe \|= 1 << (7 - gpio);
	out_8(&regs->wkup_gpioe, chip->shadow_gpioe);

	spin_unlock_irqrestore(&gpio_lock, flags);

	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);

	return 0;
	}

	static int __devinit mpc52xx_wkup_gpiochip_probe(struct of_device *ofdev,
	const struct of_device_id *match)
	{
	struct mpc52xx_gpiochip *chip;
	struct mpc52xx_gpio_wkup __iomem *regs;
	struct of_gpio_chip *ofchip;
	int ret;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	ofchip = &chip->mmchip.of_gc;

	ofchip->gpio_cells = 2;
	ofchip->gc.ngpio = 8;
	ofchip->gc.direction_input = mpc52xx_wkup_gpio_dir_in;
	ofchip->gc.direction_output = mpc52xx_wkup_gpio_dir_out;
	ofchip->gc.get = mpc52xx_wkup_gpio_get;
	ofchip->gc.set = mpc52xx_wkup_gpio_set;

	ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
	if (ret)
	return ret;

	regs = chip->mmchip.regs;
	chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
	chip->shadow_ddr = in_8(&regs->wkup_ddr);
	chip->shadow_dvo = in_8(&regs->wkup_dvo);

	return 0;
	}

	static int mpc52xx_gpiochip_remove(struct of_device *ofdev)
	{
	return -EBUSY;
	}

	static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
	{
	.compatible = "fsl,mpc5200-gpio-wkup",
	},
	{}
	};

	static struct of_platform_driver mpc52xx_wkup_gpiochip_driver = {
	.driver = {
	.name = "gpio_wkup",
	.owner = THIS_MODULE,
	.of_match_table = mpc52xx_wkup_gpiochip_match,
	},
	.probe = mpc52xx_wkup_gpiochip_probe,
	.remove = mpc52xx_gpiochip_remove,
	};

	/*
	* GPIO LIB API implementation for simple GPIOs
	*
	* There's a maximum of 32 simple GPIOs. Which of these are available
	* for use depends on your board setup.
	* The numbering reflects the bit numbering in the port registers:
	*
	* 0..1 > reserved
	* 2..3 > IRDA
	* 4..7 > ETHR
	* 8..11 > reserved
	* 12..15 > USB
	* 16..17 > reserved
	* 18..23 > PSC3
	* 24..27 > PSC2
	* 28..31 > PSC1
	*/
	static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
	{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
	unsigned int ret;

	ret = (in_be32(&regs->simple_ival) >> (31 - gpio)) & 1;

	return ret;
	}

	static inline void
	__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
	{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
	struct mpc52xx_gpiochip, mmchip);
	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;

	if (val)
	chip->shadow_dvo \|= 1 << (31 - gpio);
	else
	chip->shadow_dvo &= ~(1 << (31 - gpio));
	out_be32(&regs->simple_dvo, chip->shadow_dvo);
	}

	static void
	mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
	{
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	__mpc52xx_simple_gpio_set(gc, gpio, val);

	spin_unlock_irqrestore(&gpio_lock, flags);

	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
	}

	static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
	{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
	struct mpc52xx_gpiochip, mmchip);
	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	/* set the direction */
	chip->shadow_ddr &= ~(1 << (31 - gpio));
	out_be32(&regs->simple_ddr, chip->shadow_ddr);

	/* and enable the pin */
	chip->shadow_gpioe \|= 1 << (31 - gpio);
	out_be32(&regs->simple_gpioe, chip->shadow_gpioe);

	spin_unlock_irqrestore(&gpio_lock, flags);

	return 0;
	}

	static int
	mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
	{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
	struct mpc52xx_gpiochip, mmchip);
	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	/* First set initial value */
	__mpc52xx_simple_gpio_set(gc, gpio, val);

	/* Then set direction */
	chip->shadow_ddr \|= 1 << (31 - gpio);
	out_be32(&regs->simple_ddr, chip->shadow_ddr);

	/* Finally enable the pin */
	chip->shadow_gpioe \|= 1 << (31 - gpio);
	out_be32(&regs->simple_gpioe, chip->shadow_gpioe);

	spin_unlock_irqrestore(&gpio_lock, flags);

	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);

	return 0;
	}

	static int __devinit mpc52xx_simple_gpiochip_probe(struct of_device *ofdev,
	const struct of_device_id *match)
	{
	struct mpc52xx_gpiochip *chip;
	struct of_gpio_chip *ofchip;
	struct mpc52xx_gpio __iomem *regs;
	int ret;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	ofchip = &chip->mmchip.of_gc;

	ofchip->gpio_cells = 2;
	ofchip->gc.ngpio = 32;
	ofchip->gc.direction_input = mpc52xx_simple_gpio_dir_in;
	ofchip->gc.direction_output = mpc52xx_simple_gpio_dir_out;
	ofchip->gc.get = mpc52xx_simple_gpio_get;
	ofchip->gc.set = mpc52xx_simple_gpio_set;

	ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
	if (ret)
	return ret;

	regs = chip->mmchip.regs;
	chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
	chip->shadow_ddr = in_be32(&regs->simple_ddr);
	chip->shadow_dvo = in_be32(&regs->simple_dvo);

	return 0;
	}

	static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
	{
	.compatible = "fsl,mpc5200-gpio",
	},
	{}
	};

	static struct of_platform_driver mpc52xx_simple_gpiochip_driver = {
	.driver = {
	.name = "gpio",
	.owner = THIS_MODULE,
	.of_match_table = mpc52xx_simple_gpiochip_match,
	},
	.probe = mpc52xx_simple_gpiochip_probe,
	.remove = mpc52xx_gpiochip_remove,
	};

	static int __init mpc52xx_gpio_init(void)
	{
	if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver))
	printk(KERN_ERR "Unable to register wakeup GPIO driver\n");

	if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver))
	printk(KERN_ERR "Unable to register simple GPIO driver\n");

	return 0;
	}


	/* Make sure we get initialised before anyone else tries to use us */
	subsys_initcall(mpc52xx_gpio_init);

	/* No exit call at the moment as we cannot unregister of gpio chips */

	MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
	MODULE_LICENSE("GPL v2");