drivers/gpio/gpio-em.c - kernel/msm-4.9 - Gitiles

 /*
  * Emma Mobile GPIO Support - GIO
  *
  *  Copyright (C) 2012 Magnus Damm
  *
  * 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
  *
  * 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/init.h>
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/bitops.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/platform_data/gpio-em.h>

 struct em_gio_priv {
 	void __iomem *base0;
 	void __iomem *base1;
 	unsigned int irq_base;
 	spinlock_t sense_lock;
 	struct platform_device *pdev;
 	struct gpio_chip gpio_chip;
 	struct irq_chip irq_chip;
 	struct irq_domain *irq_domain;
 };

 #define GIO_E1 0x00
 #define GIO_E0 0x04
 #define GIO_EM 0x04
 #define GIO_OL 0x08
 #define GIO_OH 0x0c
 #define GIO_I 0x10
 #define GIO_IIA 0x14
 #define GIO_IEN 0x18
 #define GIO_IDS 0x1c
 #define GIO_IIM 0x1c
 #define GIO_RAW 0x20
 #define GIO_MST 0x24
 #define GIO_IIR 0x28

 #define GIO_IDT0 0x40
 #define GIO_IDT1 0x44
 #define GIO_IDT2 0x48
 #define GIO_IDT3 0x4c
 #define GIO_RAWBL 0x50
 #define GIO_RAWBH 0x54
 #define GIO_IRBL 0x58
 #define GIO_IRBH 0x5c

 #define GIO_IDT(n) (GIO_IDT0 + ((n) * 4))

 static inline unsigned long em_gio_read(struct em_gio_priv *p, int offs)
 {
 	if (offs < GIO_IDT0)
 		return ioread32(p->base0 + offs);
 	else
 		return ioread32(p->base1 + (offs - GIO_IDT0));
 }

 static inline void em_gio_write(struct em_gio_priv *p, int offs,
 				unsigned long value)
 {
 	if (offs < GIO_IDT0)
 		iowrite32(value, p->base0 + offs);
 	else
 		iowrite32(value, p->base1 + (offs - GIO_IDT0));
 }

 static inline struct em_gio_priv *irq_to_priv(struct irq_data *d)
 {
 	struct irq_chip *chip = irq_data_get_irq_chip(d);
 	return container_of(chip, struct em_gio_priv, irq_chip);
 }

 static void em_gio_irq_disable(struct irq_data *d)
 {
 	struct em_gio_priv *p = irq_to_priv(d);

 	em_gio_write(p, GIO_IDS, BIT(irqd_to_hwirq(d)));
 }

 static void em_gio_irq_enable(struct irq_data *d)
 {
 	struct em_gio_priv *p = irq_to_priv(d);

 	em_gio_write(p, GIO_IEN, BIT(irqd_to_hwirq(d)));
 }

 #define GIO_ASYNC(x) (x + 8)

 static unsigned char em_gio_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
 	[IRQ_TYPE_EDGE_RISING] = GIO_ASYNC(0x00),
 	[IRQ_TYPE_EDGE_FALLING] = GIO_ASYNC(0x01),
 	[IRQ_TYPE_LEVEL_HIGH] = GIO_ASYNC(0x02),
 	[IRQ_TYPE_LEVEL_LOW] = GIO_ASYNC(0x03),
 	[IRQ_TYPE_EDGE_BOTH] = GIO_ASYNC(0x04),
 };

 static int em_gio_irq_set_type(struct irq_data *d, unsigned int type)
 {
 	unsigned char value = em_gio_sense_table[type & IRQ_TYPE_SENSE_MASK];
 	struct em_gio_priv *p = irq_to_priv(d);
 	unsigned int reg, offset, shift;
 	unsigned long flags;
 	unsigned long tmp;

 	if (!value)
 		return -EINVAL;

 	offset = irqd_to_hwirq(d);

 	pr_debug("gio: sense irq = %d, mode = %d\n", offset, value);

 	/* 8 x 4 bit fields in 4 IDT registers */
 	reg = GIO_IDT(offset >> 3);
 	shift = (offset & 0x07) << 4;

 	spin_lock_irqsave(&p->sense_lock, flags);

 	/* disable the interrupt in IIA */
 	tmp = em_gio_read(p, GIO_IIA);
 	tmp &= ~BIT(offset);
 	em_gio_write(p, GIO_IIA, tmp);

 	/* change the sense setting in IDT */
 	tmp = em_gio_read(p, reg);
 	tmp &= ~(0xf << shift);
 	tmp |= value << shift;
 	em_gio_write(p, reg, tmp);

 	/* clear pending interrupts */
 	em_gio_write(p, GIO_IIR, BIT(offset));

 	/* enable the interrupt in IIA */
 	tmp = em_gio_read(p, GIO_IIA);
 	tmp |= BIT(offset);
 	em_gio_write(p, GIO_IIA, tmp);

 	spin_unlock_irqrestore(&p->sense_lock, flags);

 	return 0;
 }

 static irqreturn_t em_gio_irq_handler(int irq, void *dev_id)
 {
 	struct em_gio_priv *p = dev_id;
 	unsigned long pending;
 	unsigned int offset, irqs_handled = 0;

 	while ((pending = em_gio_read(p, GIO_MST))) {
 		offset = __ffs(pending);
 		em_gio_write(p, GIO_IIR, BIT(offset));
 		generic_handle_irq(irq_find_mapping(p->irq_domain, offset));
 		irqs_handled++;
 	}

 	return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
 }

 static inline struct em_gio_priv *gpio_to_priv(struct gpio_chip *chip)
 {
 	return container_of(chip, struct em_gio_priv, gpio_chip);
 }

 static int em_gio_direction_input(struct gpio_chip *chip, unsigned offset)
 {
 	em_gio_write(gpio_to_priv(chip), GIO_E0, BIT(offset));
 	return 0;
 }

 static int em_gio_get(struct gpio_chip *chip, unsigned offset)
 {
 	return (int)(em_gio_read(gpio_to_priv(chip), GIO_I) & BIT(offset));
 }

 static void __em_gio_set(struct gpio_chip *chip, unsigned int reg,
 			 unsigned shift, int value)
 {
 	/* upper 16 bits contains mask and lower 16 actual value */
 	em_gio_write(gpio_to_priv(chip), reg,
 		     (1 << (shift + 16)) | (value << shift));
 }

 static void em_gio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
 	/* output is split into two registers */
 	if (offset < 16)
 		__em_gio_set(chip, GIO_OL, offset, value);
 	else
 		__em_gio_set(chip, GIO_OH, offset - 16, value);
 }

 static int em_gio_direction_output(struct gpio_chip *chip, unsigned offset,
 				   int value)
 {
 	/* write GPIO value to output before selecting output mode of pin */
 	em_gio_set(chip, offset, value);
 	em_gio_write(gpio_to_priv(chip), GIO_E1, BIT(offset));
 	return 0;
 }

 static int em_gio_to_irq(struct gpio_chip *chip, unsigned offset)
 {
 	return irq_find_mapping(gpio_to_priv(chip)->irq_domain, offset);
 }

 static int em_gio_irq_domain_map(struct irq_domain *h, unsigned int virq,
 				 irq_hw_number_t hw)
 {
 	struct em_gio_priv *p = h->host_data;

 	pr_debug("gio: map hw irq = %d, virq = %d\n", (int)hw, virq);

 	irq_set_chip_data(virq, h->host_data);
 	irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq);
 	set_irq_flags(virq, IRQF_VALID); /* kill me now */
 	return 0;
 }

 static struct irq_domain_ops em_gio_irq_domain_ops = {
 	.map	= em_gio_irq_domain_map,
 };

 static int __devinit em_gio_irq_domain_init(struct em_gio_priv *p)
 {
 	struct platform_device *pdev = p->pdev;
 	struct gpio_em_config *pdata = pdev->dev.platform_data;

 	p->irq_base = irq_alloc_descs(pdata->irq_base, 0,
 				      pdata->number_of_pins, numa_node_id());
 	if (p->irq_base < 0) {
 		dev_err(&pdev->dev, "cannot get irq_desc\n");
 		return p->irq_base;
 	}
 	pr_debug("gio: hw base = %d, nr = %d, sw base = %d\n",
 		 pdata->gpio_base, pdata->number_of_pins, p->irq_base);

 	p->irq_domain = irq_domain_add_legacy(pdev->dev.of_node,
 					      pdata->number_of_pins,
 					      p->irq_base, 0,
 					      &em_gio_irq_domain_ops, p);
 	if (!p->irq_domain) {
 		irq_free_descs(p->irq_base, pdata->number_of_pins);
 		return -ENXIO;
 	}

 	return 0;
 }

 static void em_gio_irq_domain_cleanup(struct em_gio_priv *p)
 {
 	struct gpio_em_config *pdata = p->pdev->dev.platform_data;

 	irq_free_descs(p->irq_base, pdata->number_of_pins);
 	/* FIXME: irq domain wants to be freed! */
 }

 static int __devinit em_gio_probe(struct platform_device *pdev)
 {
 	struct gpio_em_config *pdata = pdev->dev.platform_data;
 	struct em_gio_priv *p;
 	struct resource *io[2], *irq[2];
 	struct gpio_chip *gpio_chip;
 	struct irq_chip *irq_chip;
 	const char *name = dev_name(&pdev->dev);
 	int ret;

 	p = kzalloc(sizeof(*p), GFP_KERNEL);
 	if (!p) {
 		dev_err(&pdev->dev, "failed to allocate driver data\n");
 		ret = -ENOMEM;
 		goto err0;
 	}

 	p->pdev = pdev;
 	platform_set_drvdata(pdev, p);
 	spin_lock_init(&p->sense_lock);

 	io[0] = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	io[1] = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1);

 	if (!io[0] || !io[1] || !irq[0] || !irq[1] || !pdata) {
 		dev_err(&pdev->dev, "missing IRQ, IOMEM or configuration\n");
 		ret = -EINVAL;
 		goto err1;
 	}

 	p->base0 = ioremap_nocache(io[0]->start, resource_size(io[0]));
 	if (!p->base0) {
 		dev_err(&pdev->dev, "failed to remap low I/O memory\n");
 		ret = -ENXIO;
 		goto err1;
 	}

 	p->base1 = ioremap_nocache(io[1]->start, resource_size(io[1]));
 	if (!p->base1) {
 		dev_err(&pdev->dev, "failed to remap high I/O memory\n");
 		ret = -ENXIO;
 		goto err2;
 	}

 	gpio_chip = &p->gpio_chip;
 	gpio_chip->direction_input = em_gio_direction_input;
 	gpio_chip->get = em_gio_get;
 	gpio_chip->direction_output = em_gio_direction_output;
 	gpio_chip->set = em_gio_set;
 	gpio_chip->to_irq = em_gio_to_irq;
 	gpio_chip->label = name;
 	gpio_chip->owner = THIS_MODULE;
 	gpio_chip->base = pdata->gpio_base;
 	gpio_chip->ngpio = pdata->number_of_pins;

 	irq_chip = &p->irq_chip;
 	irq_chip->name = name;
 	irq_chip->irq_mask = em_gio_irq_disable;
 	irq_chip->irq_unmask = em_gio_irq_enable;
 	irq_chip->irq_enable = em_gio_irq_enable;
 	irq_chip->irq_disable = em_gio_irq_disable;
 	irq_chip->irq_set_type = em_gio_irq_set_type;
 	irq_chip->flags	= IRQCHIP_SKIP_SET_WAKE;

 	ret = em_gio_irq_domain_init(p);
 	if (ret) {
 		dev_err(&pdev->dev, "cannot initialize irq domain\n");
 		goto err3;
 	}

 	if (request_irq(irq[0]->start, em_gio_irq_handler, 0, name, p)) {
 		dev_err(&pdev->dev, "failed to request low IRQ\n");
 		ret = -ENOENT;
 		goto err4;
 	}

 	if (request_irq(irq[1]->start, em_gio_irq_handler, 0, name, p)) {
 		dev_err(&pdev->dev, "failed to request high IRQ\n");
 		ret = -ENOENT;
 		goto err5;
 	}

 	ret = gpiochip_add(gpio_chip);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add GPIO controller\n");
 		goto err6;
 	}
 	return 0;

 err6:
 	free_irq(irq[1]->start, pdev);
 err5:
 	free_irq(irq[0]->start, pdev);
 err4:
 	em_gio_irq_domain_cleanup(p);
 err3:
 	iounmap(p->base1);
 err2:
 	iounmap(p->base0);
 err1:
 	kfree(p);
 err0:
 	return ret;
 }

 static int __devexit em_gio_remove(struct platform_device *pdev)
 {
 	struct em_gio_priv *p = platform_get_drvdata(pdev);
 	struct resource *irq[2];
 	int ret;

 	ret = gpiochip_remove(&p->gpio_chip);
 	if (ret)
 		return ret;

 	irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1);

 	free_irq(irq[1]->start, pdev);
 	free_irq(irq[0]->start, pdev);
 	em_gio_irq_domain_cleanup(p);
 	iounmap(p->base1);
 	iounmap(p->base0);
 	kfree(p);
 	return 0;
 }

 static struct platform_driver em_gio_device_driver = {
 	.probe		= em_gio_probe,
 	.remove		= __devexit_p(em_gio_remove),
 	.driver		= {
 		.name	= "em_gio",
 	}
 };

 module_platform_driver(em_gio_device_driver);

 MODULE_AUTHOR("Magnus Damm");
 MODULE_DESCRIPTION("Renesas Emma Mobile GIO Driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Emma Mobile GPIO Support - GIO
	*
	* Copyright (C) 2012 Magnus Damm
	*
	* 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
	*
	* 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/init.h>
	#include <linux/platform_device.h>
	#include <linux/spinlock.h>
	#include <linux/interrupt.h>
	#include <linux/ioport.h>
	#include <linux/io.h>
	#include <linux/irq.h>
	#include <linux/irqdomain.h>
	#include <linux/bitops.h>
	#include <linux/err.h>
	#include <linux/gpio.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/platform_data/gpio-em.h>

	struct em_gio_priv {
	void __iomem *base0;
	void __iomem *base1;
	unsigned int irq_base;
	spinlock_t sense_lock;
	struct platform_device *pdev;
	struct gpio_chip gpio_chip;
	struct irq_chip irq_chip;
	struct irq_domain *irq_domain;
	};

	#define GIO_E1 0x00
	#define GIO_E0 0x04
	#define GIO_EM 0x04
	#define GIO_OL 0x08
	#define GIO_OH 0x0c
	#define GIO_I 0x10
	#define GIO_IIA 0x14
	#define GIO_IEN 0x18
	#define GIO_IDS 0x1c
	#define GIO_IIM 0x1c
	#define GIO_RAW 0x20
	#define GIO_MST 0x24
	#define GIO_IIR 0x28

	#define GIO_IDT0 0x40
	#define GIO_IDT1 0x44
	#define GIO_IDT2 0x48
	#define GIO_IDT3 0x4c
	#define GIO_RAWBL 0x50
	#define GIO_RAWBH 0x54
	#define GIO_IRBL 0x58
	#define GIO_IRBH 0x5c

	#define GIO_IDT(n) (GIO_IDT0 + ((n) * 4))

	static inline unsigned long em_gio_read(struct em_gio_priv *p, int offs)
	{
	if (offs < GIO_IDT0)
	return ioread32(p->base0 + offs);
	else
	return ioread32(p->base1 + (offs - GIO_IDT0));
	}

	static inline void em_gio_write(struct em_gio_priv *p, int offs,
	unsigned long value)
	{
	if (offs < GIO_IDT0)
	iowrite32(value, p->base0 + offs);
	else
	iowrite32(value, p->base1 + (offs - GIO_IDT0));
	}

	static inline struct em_gio_priv irq_to_priv(struct irq_data d)
	{
	struct irq_chip *chip = irq_data_get_irq_chip(d);
	return container_of(chip, struct em_gio_priv, irq_chip);
	}

	static void em_gio_irq_disable(struct irq_data *d)
	{
	struct em_gio_priv *p = irq_to_priv(d);

	em_gio_write(p, GIO_IDS, BIT(irqd_to_hwirq(d)));
	}

	static void em_gio_irq_enable(struct irq_data *d)
	{
	struct em_gio_priv *p = irq_to_priv(d);

	em_gio_write(p, GIO_IEN, BIT(irqd_to_hwirq(d)));
	}

	#define GIO_ASYNC(x) (x + 8)

	static unsigned char em_gio_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
	[IRQ_TYPE_EDGE_RISING] = GIO_ASYNC(0x00),
	[IRQ_TYPE_EDGE_FALLING] = GIO_ASYNC(0x01),
	[IRQ_TYPE_LEVEL_HIGH] = GIO_ASYNC(0x02),
	[IRQ_TYPE_LEVEL_LOW] = GIO_ASYNC(0x03),
	[IRQ_TYPE_EDGE_BOTH] = GIO_ASYNC(0x04),
	};

	static int em_gio_irq_set_type(struct irq_data *d, unsigned int type)
	{
	unsigned char value = em_gio_sense_table[type & IRQ_TYPE_SENSE_MASK];
	struct em_gio_priv *p = irq_to_priv(d);
	unsigned int reg, offset, shift;
	unsigned long flags;
	unsigned long tmp;

	if (!value)
	return -EINVAL;

	offset = irqd_to_hwirq(d);

	pr_debug("gio: sense irq = %d, mode = %d\n", offset, value);

	/* 8 x 4 bit fields in 4 IDT registers */
	reg = GIO_IDT(offset >> 3);
	shift = (offset & 0x07) << 4;

	spin_lock_irqsave(&p->sense_lock, flags);

	/* disable the interrupt in IIA */
	tmp = em_gio_read(p, GIO_IIA);
	tmp &= ~BIT(offset);
	em_gio_write(p, GIO_IIA, tmp);

	/* change the sense setting in IDT */
	tmp = em_gio_read(p, reg);
	tmp &= ~(0xf << shift);
	tmp \|= value << shift;
	em_gio_write(p, reg, tmp);

	/* clear pending interrupts */
	em_gio_write(p, GIO_IIR, BIT(offset));

	/* enable the interrupt in IIA */
	tmp = em_gio_read(p, GIO_IIA);
	tmp \|= BIT(offset);
	em_gio_write(p, GIO_IIA, tmp);

	spin_unlock_irqrestore(&p->sense_lock, flags);

	return 0;
	}

	static irqreturn_t em_gio_irq_handler(int irq, void *dev_id)
	{
	struct em_gio_priv *p = dev_id;
	unsigned long pending;
	unsigned int offset, irqs_handled = 0;

	while ((pending = em_gio_read(p, GIO_MST))) {
	offset = __ffs(pending);
	em_gio_write(p, GIO_IIR, BIT(offset));
	generic_handle_irq(irq_find_mapping(p->irq_domain, offset));
	irqs_handled++;
	}

	return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
	}

	static inline struct em_gio_priv gpio_to_priv(struct gpio_chip chip)
	{
	return container_of(chip, struct em_gio_priv, gpio_chip);
	}

	static int em_gio_direction_input(struct gpio_chip *chip, unsigned offset)
	{
	em_gio_write(gpio_to_priv(chip), GIO_E0, BIT(offset));
	return 0;
	}

	static int em_gio_get(struct gpio_chip *chip, unsigned offset)
	{
	return (int)(em_gio_read(gpio_to_priv(chip), GIO_I) & BIT(offset));
	}

	static void __em_gio_set(struct gpio_chip *chip, unsigned int reg,
	unsigned shift, int value)
	{
	/* upper 16 bits contains mask and lower 16 actual value */
	em_gio_write(gpio_to_priv(chip), reg,
	(1 << (shift + 16)) \| (value << shift));
	}

	static void em_gio_set(struct gpio_chip *chip, unsigned offset, int value)
	{
	/* output is split into two registers */
	if (offset < 16)
	__em_gio_set(chip, GIO_OL, offset, value);
	else
	__em_gio_set(chip, GIO_OH, offset - 16, value);
	}

	static int em_gio_direction_output(struct gpio_chip *chip, unsigned offset,
	int value)
	{
	/* write GPIO value to output before selecting output mode of pin */
	em_gio_set(chip, offset, value);
	em_gio_write(gpio_to_priv(chip), GIO_E1, BIT(offset));
	return 0;
	}

	static int em_gio_to_irq(struct gpio_chip *chip, unsigned offset)
	{
	return irq_find_mapping(gpio_to_priv(chip)->irq_domain, offset);
	}

	static int em_gio_irq_domain_map(struct irq_domain *h, unsigned int virq,
	irq_hw_number_t hw)
	{
	struct em_gio_priv *p = h->host_data;

	pr_debug("gio: map hw irq = %d, virq = %d\n", (int)hw, virq);

	irq_set_chip_data(virq, h->host_data);
	irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq);
	set_irq_flags(virq, IRQF_VALID); /* kill me now */
	return 0;
	}

	static struct irq_domain_ops em_gio_irq_domain_ops = {
	.map = em_gio_irq_domain_map,
	};

	static int __devinit em_gio_irq_domain_init(struct em_gio_priv *p)
	{
	struct platform_device *pdev = p->pdev;
	struct gpio_em_config *pdata = pdev->dev.platform_data;

	p->irq_base = irq_alloc_descs(pdata->irq_base, 0,
	pdata->number_of_pins, numa_node_id());
	if (p->irq_base < 0) {
	dev_err(&pdev->dev, "cannot get irq_desc\n");
	return p->irq_base;
	}
	pr_debug("gio: hw base = %d, nr = %d, sw base = %d\n",
	pdata->gpio_base, pdata->number_of_pins, p->irq_base);

	p->irq_domain = irq_domain_add_legacy(pdev->dev.of_node,
	pdata->number_of_pins,
	p->irq_base, 0,
	&em_gio_irq_domain_ops, p);
	if (!p->irq_domain) {
	irq_free_descs(p->irq_base, pdata->number_of_pins);
	return -ENXIO;
	}

	return 0;
	}

	static void em_gio_irq_domain_cleanup(struct em_gio_priv *p)
	{
	struct gpio_em_config *pdata = p->pdev->dev.platform_data;

	irq_free_descs(p->irq_base, pdata->number_of_pins);
	/* FIXME: irq domain wants to be freed! */
	}

	static int __devinit em_gio_probe(struct platform_device *pdev)
	{
	struct gpio_em_config *pdata = pdev->dev.platform_data;
	struct em_gio_priv *p;
	struct resource io[2], irq[2];
	struct gpio_chip *gpio_chip;
	struct irq_chip *irq_chip;
	const char *name = dev_name(&pdev->dev);
	int ret;

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p) {
	dev_err(&pdev->dev, "failed to allocate driver data\n");
	ret = -ENOMEM;
	goto err0;
	}

	p->pdev = pdev;
	platform_set_drvdata(pdev, p);
	spin_lock_init(&p->sense_lock);

	io[0] = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	io[1] = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1);

	if (!io[0] \|\| !io[1] \|\| !irq[0] \|\| !irq[1] \|\| !pdata) {
	dev_err(&pdev->dev, "missing IRQ, IOMEM or configuration\n");
	ret = -EINVAL;
	goto err1;
	}

	p->base0 = ioremap_nocache(io[0]->start, resource_size(io[0]));
	if (!p->base0) {
	dev_err(&pdev->dev, "failed to remap low I/O memory\n");
	ret = -ENXIO;
	goto err1;
	}

	p->base1 = ioremap_nocache(io[1]->start, resource_size(io[1]));
	if (!p->base1) {
	dev_err(&pdev->dev, "failed to remap high I/O memory\n");
	ret = -ENXIO;
	goto err2;
	}

	gpio_chip = &p->gpio_chip;
	gpio_chip->direction_input = em_gio_direction_input;
	gpio_chip->get = em_gio_get;
	gpio_chip->direction_output = em_gio_direction_output;
	gpio_chip->set = em_gio_set;
	gpio_chip->to_irq = em_gio_to_irq;
	gpio_chip->label = name;
	gpio_chip->owner = THIS_MODULE;
	gpio_chip->base = pdata->gpio_base;
	gpio_chip->ngpio = pdata->number_of_pins;

	irq_chip = &p->irq_chip;
	irq_chip->name = name;
	irq_chip->irq_mask = em_gio_irq_disable;
	irq_chip->irq_unmask = em_gio_irq_enable;
	irq_chip->irq_enable = em_gio_irq_enable;
	irq_chip->irq_disable = em_gio_irq_disable;
	irq_chip->irq_set_type = em_gio_irq_set_type;
	irq_chip->flags = IRQCHIP_SKIP_SET_WAKE;

	ret = em_gio_irq_domain_init(p);
	if (ret) {
	dev_err(&pdev->dev, "cannot initialize irq domain\n");
	goto err3;
	}

	if (request_irq(irq[0]->start, em_gio_irq_handler, 0, name, p)) {
	dev_err(&pdev->dev, "failed to request low IRQ\n");
	ret = -ENOENT;
	goto err4;
	}

	if (request_irq(irq[1]->start, em_gio_irq_handler, 0, name, p)) {
	dev_err(&pdev->dev, "failed to request high IRQ\n");
	ret = -ENOENT;
	goto err5;
	}

	ret = gpiochip_add(gpio_chip);
	if (ret) {
	dev_err(&pdev->dev, "failed to add GPIO controller\n");
	goto err6;
	}
	return 0;

	err6:
	free_irq(irq[1]->start, pdev);
	err5:
	free_irq(irq[0]->start, pdev);
	err4:
	em_gio_irq_domain_cleanup(p);
	err3:
	iounmap(p->base1);
	err2:
	iounmap(p->base0);
	err1:
	kfree(p);
	err0:
	return ret;
	}

	static int __devexit em_gio_remove(struct platform_device *pdev)
	{
	struct em_gio_priv *p = platform_get_drvdata(pdev);
	struct resource *irq[2];
	int ret;

	ret = gpiochip_remove(&p->gpio_chip);
	if (ret)
	return ret;

	irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1);

	free_irq(irq[1]->start, pdev);
	free_irq(irq[0]->start, pdev);
	em_gio_irq_domain_cleanup(p);
	iounmap(p->base1);
	iounmap(p->base0);
	kfree(p);
	return 0;
	}

	static struct platform_driver em_gio_device_driver = {
	.probe = em_gio_probe,
	.remove = __devexit_p(em_gio_remove),
	.driver = {
	.name = "em_gio",
	}
	};

	module_platform_driver(em_gio_device_driver);

	MODULE_AUTHOR("Magnus Damm");
	MODULE_DESCRIPTION("Renesas Emma Mobile GIO Driver");
	MODULE_LICENSE("GPL v2");