[linux-2.6-block.git] / drivers / gpio / gpio-ixp4xx.c

// SPDX-License-Identifier: GPL-2.0
//
// IXP4 GPIO driver
// Copyright (C) 2019 Linus Walleij <linus.walleij@linaro.org>
//
// based on previous work and know-how from:
// Deepak Saxena <dsaxena@plexity.net>

#include <linux/gpio/driver.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/irqchip.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/bitops.h>
/* Include that go away with DT transition */
#include <linux/irqchip/irq-ixp4xx.h>

#include <asm/mach-types.h>

#define IXP4XX_REG_GPOUT	0x00
#define IXP4XX_REG_GPOE		0x04
#define IXP4XX_REG_GPIN		0x08
#define IXP4XX_REG_GPIS		0x0C
#define IXP4XX_REG_GPIT1	0x10
#define IXP4XX_REG_GPIT2	0x14
#define IXP4XX_REG_GPCLK	0x18
#define IXP4XX_REG_GPDBSEL	0x1C

/*
 * The hardware uses 3 bits to indicate interrupt "style".
 * we clear and set these three bits accordingly. The lower 24
 * bits in two registers (GPIT1 and GPIT2) are used to set up
 * the style for 8 lines each for a total of 16 GPIO lines.
 */
#define IXP4XX_GPIO_STYLE_ACTIVE_HIGH	0x0
#define IXP4XX_GPIO_STYLE_ACTIVE_LOW	0x1
#define IXP4XX_GPIO_STYLE_RISING_EDGE	0x2
#define IXP4XX_GPIO_STYLE_FALLING_EDGE	0x3
#define IXP4XX_GPIO_STYLE_TRANSITIONAL	0x4
#define IXP4XX_GPIO_STYLE_MASK		GENMASK(2, 0)
#define IXP4XX_GPIO_STYLE_SIZE		3

/**
 * struct ixp4xx_gpio - IXP4 GPIO state container
 * @dev: containing device for this instance
 * @fwnode: the fwnode for this GPIO chip
 * @gc: gpiochip for this instance
 * @base: remapped I/O-memory base
 * @irq_edge: Each bit represents an IRQ: 1: edge-triggered,
 * 0: level triggered
 */
struct ixp4xx_gpio {
	struct device *dev;
	struct fwnode_handle *fwnode;
	struct gpio_chip gc;
	void __iomem *base;
	unsigned long long irq_edge;
};

static void ixp4xx_gpio_irq_ack(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct ixp4xx_gpio *g = gpiochip_get_data(gc);

	__raw_writel(BIT(d->hwirq), g->base + IXP4XX_REG_GPIS);
}

static void ixp4xx_gpio_irq_unmask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct ixp4xx_gpio *g = gpiochip_get_data(gc);

	/* ACK when unmasking if not edge-triggered */
	if (!(g->irq_edge & BIT(d->hwirq)))
		ixp4xx_gpio_irq_ack(d);

	irq_chip_unmask_parent(d);
}

static int ixp4xx_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct ixp4xx_gpio *g = gpiochip_get_data(gc);
	int line = d->hwirq;
	unsigned long flags;
	u32 int_style;
	u32 int_reg;
	u32 val;

	switch (type) {
	case IRQ_TYPE_EDGE_BOTH:
		irq_set_handler_locked(d, handle_edge_irq);
		int_style = IXP4XX_GPIO_STYLE_TRANSITIONAL;
		g->irq_edge |= BIT(d->hwirq);
		break;
	case IRQ_TYPE_EDGE_RISING:
		irq_set_handler_locked(d, handle_edge_irq);
		int_style = IXP4XX_GPIO_STYLE_RISING_EDGE;
		g->irq_edge |= BIT(d->hwirq);
		break;
	case IRQ_TYPE_EDGE_FALLING:
		irq_set_handler_locked(d, handle_edge_irq);
		int_style = IXP4XX_GPIO_STYLE_FALLING_EDGE;
		g->irq_edge |= BIT(d->hwirq);
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		irq_set_handler_locked(d, handle_level_irq);
		int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH;
		g->irq_edge &= ~BIT(d->hwirq);
		break;
	case IRQ_TYPE_LEVEL_LOW:
		irq_set_handler_locked(d, handle_level_irq);
		int_style = IXP4XX_GPIO_STYLE_ACTIVE_LOW;
		g->irq_edge &= ~BIT(d->hwirq);
		break;
	default:
		return -EINVAL;
	}

	if (line >= 8) {
		/* pins 8-15 */
		line -= 8;
		int_reg = IXP4XX_REG_GPIT2;
	} else {
		/* pins 0-7 */
		int_reg = IXP4XX_REG_GPIT1;
	}

	spin_lock_irqsave(&g->gc.bgpio_lock, flags);

	/* Clear the style for the appropriate pin */
	val = __raw_readl(g->base + int_reg);
	val &= ~(IXP4XX_GPIO_STYLE_MASK << (line * IXP4XX_GPIO_STYLE_SIZE));
	__raw_writel(val, g->base + int_reg);

	__raw_writel(BIT(line), g->base + IXP4XX_REG_GPIS);

	/* Set the new style */
	val = __raw_readl(g->base + int_reg);
	val |= (int_style << (line * IXP4XX_GPIO_STYLE_SIZE));
	__raw_writel(val, g->base + int_reg);

	/* Force-configure this line as an input */
	val = __raw_readl(g->base + IXP4XX_REG_GPOE);
	val |= BIT(d->hwirq);
	__raw_writel(val, g->base + IXP4XX_REG_GPOE);

	spin_unlock_irqrestore(&g->gc.bgpio_lock, flags);

	/* This parent only accept level high (asserted) */
	return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
}

static struct irq_chip ixp4xx_gpio_irqchip = {
	.name = "IXP4GPIO",
	.irq_ack = ixp4xx_gpio_irq_ack,
	.irq_mask = irq_chip_mask_parent,
	.irq_unmask = ixp4xx_gpio_irq_unmask,
	.irq_set_type = ixp4xx_gpio_irq_set_type,
};

static int ixp4xx_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
					     unsigned int child,
					     unsigned int child_type,
					     unsigned int *parent,
					     unsigned int *parent_type)
{
	/* All these interrupts are level high in the CPU */
	*parent_type = IRQ_TYPE_LEVEL_HIGH;

	/* GPIO lines 0..12 have dedicated IRQs */
	if (child == 0) {
		*parent = 6;
		return 0;
	}
	if (child == 1) {
		*parent = 7;
		return 0;
	}
	if (child >= 2 && child <= 12) {
		*parent = child + 17;
		return 0;
	}
	return -EINVAL;
}

static int ixp4xx_gpio_probe(struct platform_device *pdev)
{
	unsigned long flags;
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct irq_domain *parent;
	struct resource *res;
	struct ixp4xx_gpio *g;
	struct gpio_irq_chip *girq;
	int ret;

	g = devm_kzalloc(dev, sizeof(*g), GFP_KERNEL);
	if (!g)
		return -ENOMEM;
	g->dev = dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	g->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(g->base)) {
		dev_err(dev, "ioremap error\n");
		return PTR_ERR(g->base);
	}

	/*
	 * When we convert to device tree we will simply look up the
	 * parent irqdomain using irq_find_host(parent) as parent comes
	 * from IRQCHIP_DECLARE(), then use of_node_to_fwnode() to get
	 * the fwnode. For now we need this boardfile style code.
	 */
	if (np) {
		struct device_node *irq_parent;

		irq_parent = of_irq_find_parent(np);
		if (!irq_parent) {
			dev_err(dev, "no IRQ parent node\n");
			return -ENODEV;
		}
		parent = irq_find_host(irq_parent);
		if (!parent) {
			dev_err(dev, "no IRQ parent domain\n");
			return -ENODEV;
		}
		g->fwnode = of_node_to_fwnode(np);
	} else {
		parent = ixp4xx_get_irq_domain();
		g->fwnode = irq_domain_alloc_fwnode(g->base);
		if (!g->fwnode) {
			dev_err(dev, "no domain base\n");
			return -ENODEV;
		}
	}

	/*
	 * Make sure GPIO 14 and 15 are NOT used as clocks but GPIO on
	 * specific machines.
	 */
	if (machine_is_dsmg600() || machine_is_nas100d())
		__raw_writel(0x0, g->base + IXP4XX_REG_GPCLK);

	/*
	 * This is a very special big-endian ARM issue: when the IXP4xx is
	 * run in big endian mode, all registers in the machine are switched
	 * around to the CPU-native endianness. As you see mostly in the
	 * driver we use __raw_readl()/__raw_writel() to access the registers
	 * in the appropriate order. With the GPIO library we need to specify
	 * byte order explicitly, so this flag needs to be set when compiling
	 * for big endian.
	 */
#if defined(CONFIG_CPU_BIG_ENDIAN)
	flags = BGPIOF_BIG_ENDIAN_BYTE_ORDER;
#else
	flags = 0;
#endif

	/* Populate and register gpio chip */
	ret = bgpio_init(&g->gc, dev, 4,
			 g->base + IXP4XX_REG_GPIN,
			 g->base + IXP4XX_REG_GPOUT,
			 NULL,
			 NULL,
			 g->base + IXP4XX_REG_GPOE,
			 flags);
	if (ret) {
		dev_err(dev, "unable to init generic GPIO\n");
		return ret;
	}
	g->gc.ngpio = 16;
	g->gc.label = "IXP4XX_GPIO_CHIP";
	/*
	 * TODO: when we have migrated to device tree and all GPIOs
	 * are fetched using phandles, set this to -1 to get rid of
	 * the fixed gpiochip base.
	 */
	g->gc.base = 0;
	g->gc.parent = &pdev->dev;
	g->gc.owner = THIS_MODULE;

	girq = &g->gc.irq;
	girq->chip = &ixp4xx_gpio_irqchip;
	girq->fwnode = g->fwnode;
	girq->parent_domain = parent;
	girq->child_to_parent_hwirq = ixp4xx_gpio_child_to_parent_hwirq;
	girq->handler = handle_bad_irq;
	girq->default_type = IRQ_TYPE_NONE;

	ret = devm_gpiochip_add_data(dev, &g->gc, g);
	if (ret) {
		dev_err(dev, "failed to add SoC gpiochip\n");
		return ret;
	}

	platform_set_drvdata(pdev, g);
	dev_info(dev, "IXP4 GPIO registered\n");

	return 0;
}

static const struct of_device_id ixp4xx_gpio_of_match[] = {
	{
		.compatible = "intel,ixp4xx-gpio",
	},
	{},
};


static struct platform_driver ixp4xx_gpio_driver = {
	.driver = {
		.name		= "ixp4xx-gpio",
		.of_match_table = of_match_ptr(ixp4xx_gpio_of_match),
	},
	.probe = ixp4xx_gpio_probe,
};
builtin_platform_driver(ixp4xx_gpio_driver);
Commit	Line	Data
813e7d36 LW	1	// SPDX-License-Identifier: GPL-2.0
	2	//
	3	// IXP4 GPIO driver
	4	// Copyright (C) 2019 Linus Walleij <linus.walleij@linaro.org>
	5	//
	6	// based on previous work and know-how from:
	7	// Deepak Saxena <dsaxena@plexity.net>
	8
	9	#include <linux/gpio/driver.h>
	10	#include <linux/io.h>
	11	#include <linux/irq.h>
	12	#include <linux/irqdomain.h>
	13	#include <linux/irqchip.h>
e4bfb0ff	14	#include <linux/of_irq.h>
813e7d36 LW	15	#include <linux/platform_device.h>
	16	#include <linux/bitops.h>
	17	/* Include that go away with DT transition */
	18	#include <linux/irqchip/irq-ixp4xx.h>
	19
	20	#include <asm/mach-types.h>
	21
	22	#define IXP4XX_REG_GPOUT 0x00
	23	#define IXP4XX_REG_GPOE 0x04
	24	#define IXP4XX_REG_GPIN 0x08
	25	#define IXP4XX_REG_GPIS 0x0C
	26	#define IXP4XX_REG_GPIT1 0x10
	27	#define IXP4XX_REG_GPIT2 0x14
	28	#define IXP4XX_REG_GPCLK 0x18
	29	#define IXP4XX_REG_GPDBSEL 0x1C
	30
	31	/*
	32	* The hardware uses 3 bits to indicate interrupt "style".
	33	* we clear and set these three bits accordingly. The lower 24
	34	* bits in two registers (GPIT1 and GPIT2) are used to set up
	35	* the style for 8 lines each for a total of 16 GPIO lines.
	36	*/
	37	#define IXP4XX_GPIO_STYLE_ACTIVE_HIGH 0x0
	38	#define IXP4XX_GPIO_STYLE_ACTIVE_LOW 0x1
	39	#define IXP4XX_GPIO_STYLE_RISING_EDGE 0x2
	40	#define IXP4XX_GPIO_STYLE_FALLING_EDGE 0x3
	41	#define IXP4XX_GPIO_STYLE_TRANSITIONAL 0x4
	42	#define IXP4XX_GPIO_STYLE_MASK GENMASK(2, 0)
	43	#define IXP4XX_GPIO_STYLE_SIZE 3
	44
	45	/**
	46	* struct ixp4xx_gpio - IXP4 GPIO state container
	47	* @dev: containing device for this instance
	48	* @fwnode: the fwnode for this GPIO chip
	49	* @gc: gpiochip for this instance
813e7d36 LW	50	* @base: remapped I/O-memory base
	51	* @irq_edge: Each bit represents an IRQ: 1: edge-triggered,
	52	* 0: level triggered
	53	*/
	54	struct ixp4xx_gpio {
	55	struct device *dev;
	56	struct fwnode_handle *fwnode;
	57	struct gpio_chip gc;
813e7d36 LW	58	void __iomem *base;
	59	unsigned long long irq_edge;
	60	};
	61
813e7d36 LW	62	static void ixp4xx_gpio_irq_ack(struct irq_data *d)
813e7d36 LW	63	{
aa7d618a LW	64	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
aa7d618a LW	65	struct ixp4xx_gpio *g = gpiochip_get_data(gc);
813e7d36 LW	66
	67	__raw_writel(BIT(d->hwirq), g->base + IXP4XX_REG_GPIS);
	68	}
	69
	70	static void ixp4xx_gpio_irq_unmask(struct irq_data *d)
	71	{
aa7d618a LW	72	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
aa7d618a LW	73	struct ixp4xx_gpio *g = gpiochip_get_data(gc);
813e7d36 LW	74
	75	/* ACK when unmasking if not edge-triggered */
	76	if (!(g->irq_edge & BIT(d->hwirq)))
	77	ixp4xx_gpio_irq_ack(d);
	78
	79	irq_chip_unmask_parent(d);
	80	}
	81
	82	static int ixp4xx_gpio_irq_set_type(struct irq_data *d, unsigned int type)
	83	{
aa7d618a LW	84	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
aa7d618a LW	85	struct ixp4xx_gpio *g = gpiochip_get_data(gc);
813e7d36 LW	86	int line = d->hwirq;
	87	unsigned long flags;
	88	u32 int_style;
	89	u32 int_reg;
	90	u32 val;
	91
	92	switch (type) {
	93	case IRQ_TYPE_EDGE_BOTH:
	94	irq_set_handler_locked(d, handle_edge_irq);
	95	int_style = IXP4XX_GPIO_STYLE_TRANSITIONAL;
	96	g->irq_edge \|= BIT(d->hwirq);
	97	break;
	98	case IRQ_TYPE_EDGE_RISING:
	99	irq_set_handler_locked(d, handle_edge_irq);
	100	int_style = IXP4XX_GPIO_STYLE_RISING_EDGE;
	101	g->irq_edge \|= BIT(d->hwirq);
	102	break;
	103	case IRQ_TYPE_EDGE_FALLING:
	104	irq_set_handler_locked(d, handle_edge_irq);
	105	int_style = IXP4XX_GPIO_STYLE_FALLING_EDGE;
	106	g->irq_edge \|= BIT(d->hwirq);
	107	break;
	108	case IRQ_TYPE_LEVEL_HIGH:
	109	irq_set_handler_locked(d, handle_level_irq);
	110	int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH;
	111	g->irq_edge &= ~BIT(d->hwirq);
	112	break;
	113	case IRQ_TYPE_LEVEL_LOW:
	114	irq_set_handler_locked(d, handle_level_irq);
	115	int_style = IXP4XX_GPIO_STYLE_ACTIVE_LOW;
	116	g->irq_edge &= ~BIT(d->hwirq);
	117	break;
	118	default:
	119	return -EINVAL;
	120	}
	121
	122	if (line >= 8) {
	123	/* pins 8-15 */
	124	line -= 8;
	125	int_reg = IXP4XX_REG_GPIT2;
	126	} else {
	127	/* pins 0-7 */
	128	int_reg = IXP4XX_REG_GPIT1;
	129	}
	130
	131	spin_lock_irqsave(&g->gc.bgpio_lock, flags);
	132
	133	/* Clear the style for the appropriate pin */
	134	val = __raw_readl(g->base + int_reg);
	135	val &= ~(IXP4XX_GPIO_STYLE_MASK << (line * IXP4XX_GPIO_STYLE_SIZE));
	136	__raw_writel(val, g->base + int_reg);
	137
	138	__raw_writel(BIT(line), g->base + IXP4XX_REG_GPIS);
	139
	140	/* Set the new style */
	141	val = __raw_readl(g->base + int_reg);
	142	val \|= (int_style << (line * IXP4XX_GPIO_STYLE_SIZE));
	143	__raw_writel(val, g->base + int_reg);
	144
	145	/* Force-configure this line as an input */
	146	val = __raw_readl(g->base + IXP4XX_REG_GPOE);
	147	val \|= BIT(d->hwirq);
	148	__raw_writel(val, g->base + IXP4XX_REG_GPOE);
	149
150	spin_unlock_irqrestore(&g->gc.bgpio_lock, flags);
151
152	/* This parent only accept level high (asserted) */
153	return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
154	}
155
156	static struct irq_chip ixp4xx_gpio_irqchip = {
157	.name = "IXP4GPIO",
158	.irq_ack = ixp4xx_gpio_irq_ack,
159	.irq_mask = irq_chip_mask_parent,
160	.irq_unmask = ixp4xx_gpio_irq_unmask,
161	.irq_set_type = ixp4xx_gpio_irq_set_type,
162	};
163
aa7d618a LW	164	static int ixp4xx_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
	165	unsigned int child,
	166	unsigned int child_type,
	167	unsigned int *parent,
	168	unsigned int *parent_type)
813e7d36	169	{
aa7d618a LW	170	/* All these interrupts are level high in the CPU */
aa7d618a LW	171	*parent_type = IRQ_TYPE_LEVEL_HIGH;
813e7d36	172
aa7d618a LW	173	/* GPIO lines 0..12 have dedicated IRQs */
	174	if (child == 0) {
	175	*parent = 6;
	176	return 0;
813e7d36	177	}
aa7d618a LW	178	if (child == 1) {
aa7d618a LW	179	*parent = 7;
813e7d36 LW	180	return 0;
813e7d36 LW	181	}
aa7d618a LW	182	if (child >= 2 && child <= 12) {
	183	*parent = child + 17;
	184	return 0;
813e7d36	185	}
aa7d618a	186	return -EINVAL;
813e7d36 LW	187	}
813e7d36 LW	188
813e7d36 LW	189	static int ixp4xx_gpio_probe(struct platform_device *pdev)
	190	{
	191	unsigned long flags;
	192	struct device *dev = &pdev->dev;
e4bfb0ff	193	struct device_node *np = dev->of_node;
813e7d36 LW	194	struct irq_domain *parent;
	195	struct resource *res;
	196	struct ixp4xx_gpio *g;
aa7d618a	197	struct gpio_irq_chip *girq;
813e7d36	198	int ret;
813e7d36 LW	199
	200	g = devm_kzalloc(dev, sizeof(*g), GFP_KERNEL);
	201	if (!g)
	202	return -ENOMEM;
	203	g->dev = dev;
	204
	205	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	206	g->base = devm_ioremap_resource(dev, res);
	207	if (IS_ERR(g->base)) {
	208	dev_err(dev, "ioremap error\n");
	209	return PTR_ERR(g->base);
	210	}
	211
aa7d618a LW	212	/*
	213	* When we convert to device tree we will simply look up the
	214	* parent irqdomain using irq_find_host(parent) as parent comes
	215	* from IRQCHIP_DECLARE(), then use of_node_to_fwnode() to get
	216	* the fwnode. For now we need this boardfile style code.
	217	*/
	218	if (np) {
	219	struct device_node *irq_parent;
	220
	221	irq_parent = of_irq_find_parent(np);
	222	if (!irq_parent) {
	223	dev_err(dev, "no IRQ parent node\n");
	224	return -ENODEV;
	225	}
	226	parent = irq_find_host(irq_parent);
	227	if (!parent) {
	228	dev_err(dev, "no IRQ parent domain\n");
	229	return -ENODEV;
	230	}
	231	g->fwnode = of_node_to_fwnode(np);
	232	} else {
	233	parent = ixp4xx_get_irq_domain();
	234	g->fwnode = irq_domain_alloc_fwnode(g->base);
	235	if (!g->fwnode) {
	236	dev_err(dev, "no domain base\n");
	237	return -ENODEV;
	238	}
	239	}
	240
813e7d36 LW	241	/*
	242	* Make sure GPIO 14 and 15 are NOT used as clocks but GPIO on
	243	* specific machines.
	244	*/
	245	if (machine_is_dsmg600() \|\| machine_is_nas100d())
	246	__raw_writel(0x0, g->base + IXP4XX_REG_GPCLK);
	247
	248	/*
	249	* This is a very special big-endian ARM issue: when the IXP4xx is
	250	* run in big endian mode, all registers in the machine are switched
	251	* around to the CPU-native endianness. As you see mostly in the
	252	* driver we use __raw_readl()/__raw_writel() to access the registers
	253	* in the appropriate order. With the GPIO library we need to specify
	254	* byte order explicitly, so this flag needs to be set when compiling
	255	* for big endian.
	256	*/
	257	#if defined(CONFIG_CPU_BIG_ENDIAN)
	258	flags = BGPIOF_BIG_ENDIAN_BYTE_ORDER;
	259	#else
	260	flags = 0;
	261	#endif
	262
	263	/* Populate and register gpio chip */
	264	ret = bgpio_init(&g->gc, dev, 4,
	265	g->base + IXP4XX_REG_GPIN,
	266	g->base + IXP4XX_REG_GPOUT,
	267	NULL,
	268	NULL,
	269	g->base + IXP4XX_REG_GPOE,
	270	flags);
	271	if (ret) {
	272	dev_err(dev, "unable to init generic GPIO\n");
	273	return ret;
	274	}
813e7d36 LW	275	g->gc.ngpio = 16;
	276	g->gc.label = "IXP4XX_GPIO_CHIP";
	277	/*
	278	* TODO: when we have migrated to device tree and all GPIOs
	279	* are fetched using phandles, set this to -1 to get rid of
	280	* the fixed gpiochip base.
	281	*/
	282	g->gc.base = 0;
	283	g->gc.parent = &pdev->dev;
	284	g->gc.owner = THIS_MODULE;
	285
aa7d618a LW	286	girq = &g->gc.irq;
	287	girq->chip = &ixp4xx_gpio_irqchip;
	288	girq->fwnode = g->fwnode;
	289	girq->parent_domain = parent;
	290	girq->child_to_parent_hwirq = ixp4xx_gpio_child_to_parent_hwirq;
	291	girq->handler = handle_bad_irq;
	292	girq->default_type = IRQ_TYPE_NONE;
	293
813e7d36 LW	294	ret = devm_gpiochip_add_data(dev, &g->gc, g);
	295	if (ret) {
	296	dev_err(dev, "failed to add SoC gpiochip\n");
	297	return ret;
	298	}
	299
813e7d36	300	platform_set_drvdata(pdev, g);
aa7d618a	301	dev_info(dev, "IXP4 GPIO registered\n");
813e7d36 LW	302
	303	return 0;
	304	}
	305
e4bfb0ff LW	306	static const struct of_device_id ixp4xx_gpio_of_match[] = {
	307	{
	308	.compatible = "intel,ixp4xx-gpio",
	309	},
	310	{},
	311	};
	312
	313
813e7d36 LW	314	static struct platform_driver ixp4xx_gpio_driver = {
	315	.driver = {
	316	.name = "ixp4xx-gpio",
e4bfb0ff	317	.of_match_table = of_match_ptr(ixp4xx_gpio_of_match),
813e7d36 LW	318	},
	319	.probe = ixp4xx_gpio_probe,
	320	};
	321	builtin_platform_driver(ixp4xx_gpio_driver);