drivers/gpio/gpio-xlp.c - linux - Git at Google

 /*
  * Copyright (C) 2003-2015 Broadcom Corporation
  * All Rights Reserved
  *
  * 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.
  */

 #include <linux/gpio.h>
 #include <linux/platform_device.h>
 #include <linux/of_device.h>
 #include <linux/module.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/acpi.h>

 /*
  * XLP GPIO has multiple 32 bit registers for each feature where each register
  * controls 32 pins. So, pins up to 64 require 2 32-bit registers and up to 96
  * require 3 32-bit registers for each feature.
  * Here we only define offset of the first register for each feature. Offset of
  * the registers for pins greater than 32 can be calculated as following(Use
  * GPIO_INT_STAT as example):
  *
  * offset = (gpio / XLP_GPIO_REGSZ) * 4;
  * reg_addr = addr + offset;
  *
  * where addr is base address of the that feature register and gpio is the pin.
  */
 #define GPIO_OUTPUT_EN		0x00
 #define GPIO_PADDRV		0x08
 #define GPIO_INT_EN00		0x18
 #define GPIO_INT_EN10		0x20
 #define GPIO_INT_EN20		0x28
 #define GPIO_INT_EN30		0x30
 #define GPIO_INT_POL		0x38
 #define GPIO_INT_TYPE		0x40
 #define GPIO_INT_STAT		0x48

 #define GPIO_9XX_BYTESWAP	0X00
 #define GPIO_9XX_CTRL		0X04
 #define GPIO_9XX_OUTPUT_EN	0x14
 #define GPIO_9XX_PADDRV		0x24
 /*
  * Only for 4 interrupt enable reg are defined for now,
  * total reg available are 12.
  */
 #define GPIO_9XX_INT_EN00	0x44
 #define GPIO_9XX_INT_EN10	0x54
 #define GPIO_9XX_INT_EN20	0x64
 #define GPIO_9XX_INT_EN30	0x74
 #define GPIO_9XX_INT_POL	0x104
 #define GPIO_9XX_INT_TYPE	0x114
 #define GPIO_9XX_INT_STAT	0x124

 #define GPIO_3XX_INT_EN00	0x18
 #define GPIO_3XX_INT_EN10	0x20
 #define GPIO_3XX_INT_EN20	0x28
 #define GPIO_3XX_INT_EN30	0x30
 #define GPIO_3XX_INT_POL	0x78
 #define GPIO_3XX_INT_TYPE	0x80
 #define GPIO_3XX_INT_STAT	0x88

 /* Interrupt type register mask */
 #define XLP_GPIO_IRQ_TYPE_LVL	0x0
 #define XLP_GPIO_IRQ_TYPE_EDGE	0x1

 /* Interrupt polarity register mask */
 #define XLP_GPIO_IRQ_POL_HIGH	0x0
 #define XLP_GPIO_IRQ_POL_LOW	0x1

 #define XLP_GPIO_REGSZ		32
 #define XLP_GPIO_IRQ_BASE	768
 #define XLP_MAX_NR_GPIO		96

 /* XLP variants supported by this driver */
 enum {
 	XLP_GPIO_VARIANT_XLP832 = 1,
 	XLP_GPIO_VARIANT_XLP316,
 	XLP_GPIO_VARIANT_XLP208,
 	XLP_GPIO_VARIANT_XLP980,
 	XLP_GPIO_VARIANT_XLP532,
 	GPIO_VARIANT_VULCAN
 };

 struct xlp_gpio_priv {
 	struct gpio_chip chip;
 	DECLARE_BITMAP(gpio_enabled_mask, XLP_MAX_NR_GPIO);
 	void __iomem *gpio_intr_en;	/* pointer to first intr enable reg */
 	void __iomem *gpio_intr_stat;	/* pointer to first intr status reg */
 	void __iomem *gpio_intr_type;	/* pointer to first intr type reg */
 	void __iomem *gpio_intr_pol;	/* pointer to first intr polarity reg */
 	void __iomem *gpio_out_en;	/* pointer to first output enable reg */
 	void __iomem *gpio_paddrv;	/* pointer to first pad drive reg */
 	spinlock_t lock;
 };

 static int xlp_gpio_get_reg(void __iomem *addr, unsigned gpio)
 {
 	u32 pos, regset;

 	pos = gpio % XLP_GPIO_REGSZ;
 	regset = (gpio / XLP_GPIO_REGSZ) * 4;
 	return !!(readl(addr + regset) & BIT(pos));
 }

 static void xlp_gpio_set_reg(void __iomem *addr, unsigned gpio, int state)
 {
 	u32 value, pos, regset;

 	pos = gpio % XLP_GPIO_REGSZ;
 	regset = (gpio / XLP_GPIO_REGSZ) * 4;
 	value = readl(addr + regset);

 	if (state)
 		value |= BIT(pos);
 	else
 		value &= ~BIT(pos);

 	writel(value, addr + regset);
 }

 static void xlp_gpio_irq_disable(struct irq_data *d)
 {
 	struct gpio_chip *gc  = irq_data_get_irq_chip_data(d);
 	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
 	unsigned long flags;

 	spin_lock_irqsave(&priv->lock, flags);
 	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
 	__clear_bit(d->hwirq, priv->gpio_enabled_mask);
 	spin_unlock_irqrestore(&priv->lock, flags);
 }

 static void xlp_gpio_irq_mask_ack(struct irq_data *d)
 {
 	struct gpio_chip *gc  = irq_data_get_irq_chip_data(d);
 	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
 	unsigned long flags;

 	spin_lock_irqsave(&priv->lock, flags);
 	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
 	xlp_gpio_set_reg(priv->gpio_intr_stat, d->hwirq, 0x1);
 	__clear_bit(d->hwirq, priv->gpio_enabled_mask);
 	spin_unlock_irqrestore(&priv->lock, flags);
 }

 static void xlp_gpio_irq_unmask(struct irq_data *d)
 {
 	struct gpio_chip *gc  = irq_data_get_irq_chip_data(d);
 	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
 	unsigned long flags;

 	spin_lock_irqsave(&priv->lock, flags);
 	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x1);
 	__set_bit(d->hwirq, priv->gpio_enabled_mask);
 	spin_unlock_irqrestore(&priv->lock, flags);
 }

 static int xlp_gpio_set_irq_type(struct irq_data *d, unsigned int type)
 {
 	struct gpio_chip *gc  = irq_data_get_irq_chip_data(d);
 	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
 	int pol, irq_type;

 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
 		irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
 		pol = XLP_GPIO_IRQ_POL_HIGH;
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
 		pol = XLP_GPIO_IRQ_POL_LOW;
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		irq_type = XLP_GPIO_IRQ_TYPE_LVL;
 		pol = XLP_GPIO_IRQ_POL_HIGH;
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		irq_type = XLP_GPIO_IRQ_TYPE_LVL;
 		pol = XLP_GPIO_IRQ_POL_LOW;
 		break;
 	default:
 		return -EINVAL;
 	}

 	xlp_gpio_set_reg(priv->gpio_intr_type, d->hwirq, irq_type);
 	xlp_gpio_set_reg(priv->gpio_intr_pol, d->hwirq, pol);

 	return 0;
 }

 static struct irq_chip xlp_gpio_irq_chip = {
 	.name		= "XLP-GPIO",
 	.irq_mask_ack	= xlp_gpio_irq_mask_ack,
 	.irq_disable	= xlp_gpio_irq_disable,
 	.irq_set_type	= xlp_gpio_set_irq_type,
 	.irq_unmask	= xlp_gpio_irq_unmask,
 	.flags		= IRQCHIP_ONESHOT_SAFE,
 };

 static void xlp_gpio_generic_handler(struct irq_desc *desc)
 {
 	struct xlp_gpio_priv *priv = irq_desc_get_handler_data(desc);
 	struct irq_chip *irqchip = irq_desc_get_chip(desc);
 	int gpio, regoff;
 	u32 gpio_stat;

 	regoff = -1;
 	gpio_stat = 0;

 	chained_irq_enter(irqchip, desc);
 	for_each_set_bit(gpio, priv->gpio_enabled_mask, XLP_MAX_NR_GPIO) {
 		if (regoff != gpio / XLP_GPIO_REGSZ) {
 			regoff = gpio / XLP_GPIO_REGSZ;
 			gpio_stat = readl(priv->gpio_intr_stat + regoff * 4);
 		}

 		if (gpio_stat & BIT(gpio % XLP_GPIO_REGSZ))
 			generic_handle_irq(irq_find_mapping(
 						priv->chip.irq.domain, gpio));
 	}
 	chained_irq_exit(irqchip, desc);
 }

 static int xlp_gpio_dir_output(struct gpio_chip *gc, unsigned gpio, int state)
 {
 	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

 	BUG_ON(gpio >= gc->ngpio);
 	xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x1);

 	return 0;
 }

 static int xlp_gpio_dir_input(struct gpio_chip *gc, unsigned gpio)
 {
 	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

 	BUG_ON(gpio >= gc->ngpio);
 	xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x0);

 	return 0;
 }

 static int xlp_gpio_get(struct gpio_chip *gc, unsigned gpio)
 {
 	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

 	BUG_ON(gpio >= gc->ngpio);
 	return xlp_gpio_get_reg(priv->gpio_paddrv, gpio);
 }

 static void xlp_gpio_set(struct gpio_chip *gc, unsigned gpio, int state)
 {
 	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

 	BUG_ON(gpio >= gc->ngpio);
 	xlp_gpio_set_reg(priv->gpio_paddrv, gpio, state);
 }

 static const struct of_device_id xlp_gpio_of_ids[] = {
 	{
 		.compatible = "netlogic,xlp832-gpio",
 		.data	    = (void *)XLP_GPIO_VARIANT_XLP832,
 	},
 	{
 		.compatible = "netlogic,xlp316-gpio",
 		.data	    = (void *)XLP_GPIO_VARIANT_XLP316,
 	},
 	{
 		.compatible = "netlogic,xlp208-gpio",
 		.data	    = (void *)XLP_GPIO_VARIANT_XLP208,
 	},
 	{
 		.compatible = "netlogic,xlp980-gpio",
 		.data	    = (void *)XLP_GPIO_VARIANT_XLP980,
 	},
 	{
 		.compatible = "netlogic,xlp532-gpio",
 		.data	    = (void *)XLP_GPIO_VARIANT_XLP532,
 	},
 	{
 		.compatible = "brcm,vulcan-gpio",
 		.data	    = (void *)GPIO_VARIANT_VULCAN,
 	},
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, xlp_gpio_of_ids);

 static int xlp_gpio_probe(struct platform_device *pdev)
 {
 	struct gpio_chip *gc;
 	struct resource *iores;
 	struct xlp_gpio_priv *priv;
 	void __iomem *gpio_base;
 	int irq_base, irq, err;
 	int ngpio;
 	u32 soc_type;

 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!iores)
 		return -ENODEV;

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

 	gpio_base = devm_ioremap_resource(&pdev->dev, iores);
 	if (IS_ERR(gpio_base))
 		return PTR_ERR(gpio_base);

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;

 	if (pdev->dev.of_node) {
 		soc_type = (uintptr_t)of_device_get_match_data(&pdev->dev);
 	} else {
 		const struct acpi_device_id *acpi_id;

 		acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
 						&pdev->dev);
 		if (!acpi_id || !acpi_id->driver_data) {
 			dev_err(&pdev->dev, "Unable to match ACPI ID\n");
 			return -ENODEV;
 		}
 		soc_type = (uintptr_t) acpi_id->driver_data;
 	}

 	switch (soc_type) {
 	case XLP_GPIO_VARIANT_XLP832:
 		priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
 		priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
 		priv->gpio_intr_stat = gpio_base + GPIO_INT_STAT;
 		priv->gpio_intr_type = gpio_base + GPIO_INT_TYPE;
 		priv->gpio_intr_pol = gpio_base + GPIO_INT_POL;
 		priv->gpio_intr_en = gpio_base + GPIO_INT_EN00;
 		ngpio = 41;
 		break;
 	case XLP_GPIO_VARIANT_XLP208:
 	case XLP_GPIO_VARIANT_XLP316:
 		priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
 		priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
 		priv->gpio_intr_stat = gpio_base + GPIO_3XX_INT_STAT;
 		priv->gpio_intr_type = gpio_base + GPIO_3XX_INT_TYPE;
 		priv->gpio_intr_pol = gpio_base + GPIO_3XX_INT_POL;
 		priv->gpio_intr_en = gpio_base + GPIO_3XX_INT_EN00;

 		ngpio = (soc_type == XLP_GPIO_VARIANT_XLP208) ? 42 : 57;
 		break;
 	case XLP_GPIO_VARIANT_XLP980:
 	case XLP_GPIO_VARIANT_XLP532:
 	case GPIO_VARIANT_VULCAN:
 		priv->gpio_out_en = gpio_base + GPIO_9XX_OUTPUT_EN;
 		priv->gpio_paddrv = gpio_base + GPIO_9XX_PADDRV;
 		priv->gpio_intr_stat = gpio_base + GPIO_9XX_INT_STAT;
 		priv->gpio_intr_type = gpio_base + GPIO_9XX_INT_TYPE;
 		priv->gpio_intr_pol = gpio_base + GPIO_9XX_INT_POL;
 		priv->gpio_intr_en = gpio_base + GPIO_9XX_INT_EN00;

 		if (soc_type == XLP_GPIO_VARIANT_XLP980)
 			ngpio = 66;
 		else if (soc_type == XLP_GPIO_VARIANT_XLP532)
 			ngpio = 67;
 		else
 			ngpio = 70;
 		break;
 	default:
 		dev_err(&pdev->dev, "Unknown Processor type!\n");
 		return -ENODEV;
 	}

 	bitmap_zero(priv->gpio_enabled_mask, XLP_MAX_NR_GPIO);

 	gc = &priv->chip;

 	gc->owner = THIS_MODULE;
 	gc->label = dev_name(&pdev->dev);
 	gc->base = 0;
 	gc->parent = &pdev->dev;
 	gc->ngpio = ngpio;
 	gc->of_node = pdev->dev.of_node;
 	gc->direction_output = xlp_gpio_dir_output;
 	gc->direction_input = xlp_gpio_dir_input;
 	gc->set = xlp_gpio_set;
 	gc->get = xlp_gpio_get;

 	spin_lock_init(&priv->lock);

 	/* XLP(MIPS) has fixed range for GPIO IRQs, Vulcan(ARM64) does not */
 	if (soc_type != GPIO_VARIANT_VULCAN) {
 		irq_base = devm_irq_alloc_descs(&pdev->dev, -1,
 						XLP_GPIO_IRQ_BASE,
 						gc->ngpio, 0);
 		if (irq_base < 0) {
 			dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
 			return irq_base;
 		}
 	} else {
 		irq_base = 0;
 	}

 	err = gpiochip_add_data(gc, priv);
 	if (err < 0)
 		return err;

 	err = gpiochip_irqchip_add(gc, &xlp_gpio_irq_chip, irq_base,
 				handle_level_irq, IRQ_TYPE_NONE);
 	if (err) {
 		dev_err(&pdev->dev, "Could not connect irqchip to gpiochip!\n");
 		goto out_gpio_remove;
 	}

 	gpiochip_set_chained_irqchip(gc, &xlp_gpio_irq_chip, irq,
 			xlp_gpio_generic_handler);

 	dev_info(&pdev->dev, "registered %d GPIOs\n", gc->ngpio);

 	return 0;

 out_gpio_remove:
 	gpiochip_remove(gc);
 	return err;
 }

 #ifdef CONFIG_ACPI
 static const struct acpi_device_id xlp_gpio_acpi_match[] = {
 	{ "BRCM9006", GPIO_VARIANT_VULCAN },
 	{ "CAV9006",  GPIO_VARIANT_VULCAN },
 	{},
 };
 MODULE_DEVICE_TABLE(acpi, xlp_gpio_acpi_match);
 #endif

 static struct platform_driver xlp_gpio_driver = {
 	.driver		= {
 		.name	= "xlp-gpio",
 		.of_match_table = xlp_gpio_of_ids,
 		.acpi_match_table = ACPI_PTR(xlp_gpio_acpi_match),
 	},
 	.probe		= xlp_gpio_probe,
 };
 module_platform_driver(xlp_gpio_driver);

 MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
 MODULE_AUTHOR("Ganesan Ramalingam <ganesanr@broadcom.com>");
 MODULE_DESCRIPTION("Netlogic XLP GPIO Driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (C) 2003-2015 Broadcom Corporation
	* All Rights Reserved
	*
	* 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.
	*/

	#include <linux/gpio.h>
	#include <linux/platform_device.h>
	#include <linux/of_device.h>
	#include <linux/module.h>
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/irqchip/chained_irq.h>
	#include <linux/acpi.h>

	/*
	* XLP GPIO has multiple 32 bit registers for each feature where each register
	* controls 32 pins. So, pins up to 64 require 2 32-bit registers and up to 96
	* require 3 32-bit registers for each feature.
	* Here we only define offset of the first register for each feature. Offset of
	* the registers for pins greater than 32 can be calculated as following(Use
	* GPIO_INT_STAT as example):
	*
	* offset = (gpio / XLP_GPIO_REGSZ) * 4;
	* reg_addr = addr + offset;
	*
	* where addr is base address of the that feature register and gpio is the pin.
	*/
	#define GPIO_OUTPUT_EN 0x00
	#define GPIO_PADDRV 0x08
	#define GPIO_INT_EN00 0x18
	#define GPIO_INT_EN10 0x20
	#define GPIO_INT_EN20 0x28
	#define GPIO_INT_EN30 0x30
	#define GPIO_INT_POL 0x38
	#define GPIO_INT_TYPE 0x40
	#define GPIO_INT_STAT 0x48

	#define GPIO_9XX_BYTESWAP 0X00
	#define GPIO_9XX_CTRL 0X04
	#define GPIO_9XX_OUTPUT_EN 0x14
	#define GPIO_9XX_PADDRV 0x24
	/*
	* Only for 4 interrupt enable reg are defined for now,
	* total reg available are 12.
	*/
	#define GPIO_9XX_INT_EN00 0x44
	#define GPIO_9XX_INT_EN10 0x54
	#define GPIO_9XX_INT_EN20 0x64
	#define GPIO_9XX_INT_EN30 0x74
	#define GPIO_9XX_INT_POL 0x104
	#define GPIO_9XX_INT_TYPE 0x114
	#define GPIO_9XX_INT_STAT 0x124

	#define GPIO_3XX_INT_EN00 0x18
	#define GPIO_3XX_INT_EN10 0x20
	#define GPIO_3XX_INT_EN20 0x28
	#define GPIO_3XX_INT_EN30 0x30
	#define GPIO_3XX_INT_POL 0x78
	#define GPIO_3XX_INT_TYPE 0x80
	#define GPIO_3XX_INT_STAT 0x88

	/* Interrupt type register mask */
	#define XLP_GPIO_IRQ_TYPE_LVL 0x0
	#define XLP_GPIO_IRQ_TYPE_EDGE 0x1

	/* Interrupt polarity register mask */
	#define XLP_GPIO_IRQ_POL_HIGH 0x0
	#define XLP_GPIO_IRQ_POL_LOW 0x1

	#define XLP_GPIO_REGSZ 32
	#define XLP_GPIO_IRQ_BASE 768
	#define XLP_MAX_NR_GPIO 96

	/* XLP variants supported by this driver */
	enum {
	XLP_GPIO_VARIANT_XLP832 = 1,
	XLP_GPIO_VARIANT_XLP316,
	XLP_GPIO_VARIANT_XLP208,
	XLP_GPIO_VARIANT_XLP980,
	XLP_GPIO_VARIANT_XLP532,
	GPIO_VARIANT_VULCAN
	};

	struct xlp_gpio_priv {
	struct gpio_chip chip;
	DECLARE_BITMAP(gpio_enabled_mask, XLP_MAX_NR_GPIO);
	void __iomem gpio_intr_en; / pointer to first intr enable reg */
	void __iomem gpio_intr_stat; / pointer to first intr status reg */
	void __iomem gpio_intr_type; / pointer to first intr type reg */
	void __iomem gpio_intr_pol; / pointer to first intr polarity reg */
	void __iomem gpio_out_en; / pointer to first output enable reg */
	void __iomem gpio_paddrv; / pointer to first pad drive reg */
	spinlock_t lock;
	};

	static int xlp_gpio_get_reg(void __iomem *addr, unsigned gpio)
	{
	u32 pos, regset;

	pos = gpio % XLP_GPIO_REGSZ;
	regset = (gpio / XLP_GPIO_REGSZ) * 4;
	return !!(readl(addr + regset) & BIT(pos));
	}

	static void xlp_gpio_set_reg(void __iomem *addr, unsigned gpio, int state)
	{
	u32 value, pos, regset;

	pos = gpio % XLP_GPIO_REGSZ;
	regset = (gpio / XLP_GPIO_REGSZ) * 4;
	value = readl(addr + regset);

	if (state)
	value \|= BIT(pos);
	else
	value &= ~BIT(pos);

	writel(value, addr + regset);
	}

	static void xlp_gpio_irq_disable(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
	__clear_bit(d->hwirq, priv->gpio_enabled_mask);
	spin_unlock_irqrestore(&priv->lock, flags);
	}

	static void xlp_gpio_irq_mask_ack(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
	xlp_gpio_set_reg(priv->gpio_intr_stat, d->hwirq, 0x1);
	__clear_bit(d->hwirq, priv->gpio_enabled_mask);
	spin_unlock_irqrestore(&priv->lock, flags);
	}

	static void xlp_gpio_irq_unmask(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x1);
	__set_bit(d->hwirq, priv->gpio_enabled_mask);
	spin_unlock_irqrestore(&priv->lock, flags);
	}

	static int xlp_gpio_set_irq_type(struct irq_data *d, unsigned int type)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
	int pol, irq_type;

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
	irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
	pol = XLP_GPIO_IRQ_POL_HIGH;
	break;
	case IRQ_TYPE_EDGE_FALLING:
	irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
	pol = XLP_GPIO_IRQ_POL_LOW;
	break;
	case IRQ_TYPE_LEVEL_HIGH:
	irq_type = XLP_GPIO_IRQ_TYPE_LVL;
	pol = XLP_GPIO_IRQ_POL_HIGH;
	break;
	case IRQ_TYPE_LEVEL_LOW:
	irq_type = XLP_GPIO_IRQ_TYPE_LVL;
	pol = XLP_GPIO_IRQ_POL_LOW;
	break;
	default:
	return -EINVAL;
	}

	xlp_gpio_set_reg(priv->gpio_intr_type, d->hwirq, irq_type);
	xlp_gpio_set_reg(priv->gpio_intr_pol, d->hwirq, pol);

	return 0;
	}

	static struct irq_chip xlp_gpio_irq_chip = {
	.name = "XLP-GPIO",
	.irq_mask_ack = xlp_gpio_irq_mask_ack,
	.irq_disable = xlp_gpio_irq_disable,
	.irq_set_type = xlp_gpio_set_irq_type,
	.irq_unmask = xlp_gpio_irq_unmask,
	.flags = IRQCHIP_ONESHOT_SAFE,
	};

	static void xlp_gpio_generic_handler(struct irq_desc *desc)
	{
	struct xlp_gpio_priv *priv = irq_desc_get_handler_data(desc);
	struct irq_chip *irqchip = irq_desc_get_chip(desc);
	int gpio, regoff;
	u32 gpio_stat;

	regoff = -1;
	gpio_stat = 0;

	chained_irq_enter(irqchip, desc);
	for_each_set_bit(gpio, priv->gpio_enabled_mask, XLP_MAX_NR_GPIO) {
	if (regoff != gpio / XLP_GPIO_REGSZ) {
	regoff = gpio / XLP_GPIO_REGSZ;
	gpio_stat = readl(priv->gpio_intr_stat + regoff * 4);
	}

	if (gpio_stat & BIT(gpio % XLP_GPIO_REGSZ))
	generic_handle_irq(irq_find_mapping(
	priv->chip.irq.domain, gpio));
	}
	chained_irq_exit(irqchip, desc);
	}

	static int xlp_gpio_dir_output(struct gpio_chip *gc, unsigned gpio, int state)
	{
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

	BUG_ON(gpio >= gc->ngpio);
	xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x1);

	return 0;
	}

	static int xlp_gpio_dir_input(struct gpio_chip *gc, unsigned gpio)
	{
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

	BUG_ON(gpio >= gc->ngpio);
	xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x0);

	return 0;
	}

	static int xlp_gpio_get(struct gpio_chip *gc, unsigned gpio)
	{
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

	BUG_ON(gpio >= gc->ngpio);
	return xlp_gpio_get_reg(priv->gpio_paddrv, gpio);
	}

	static void xlp_gpio_set(struct gpio_chip *gc, unsigned gpio, int state)
	{
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

	BUG_ON(gpio >= gc->ngpio);
	xlp_gpio_set_reg(priv->gpio_paddrv, gpio, state);
	}

	static const struct of_device_id xlp_gpio_of_ids[] = {
	{
	.compatible = "netlogic,xlp832-gpio",
	.data = (void *)XLP_GPIO_VARIANT_XLP832,
	},
	{
	.compatible = "netlogic,xlp316-gpio",
	.data = (void *)XLP_GPIO_VARIANT_XLP316,
	},
	{
	.compatible = "netlogic,xlp208-gpio",
	.data = (void *)XLP_GPIO_VARIANT_XLP208,
	},
	{
	.compatible = "netlogic,xlp980-gpio",
	.data = (void *)XLP_GPIO_VARIANT_XLP980,
	},
	{
	.compatible = "netlogic,xlp532-gpio",
	.data = (void *)XLP_GPIO_VARIANT_XLP532,
	},
	{
	.compatible = "brcm,vulcan-gpio",
	.data = (void *)GPIO_VARIANT_VULCAN,
	},
	{ /* sentinel */ },
	};
	MODULE_DEVICE_TABLE(of, xlp_gpio_of_ids);

	static int xlp_gpio_probe(struct platform_device *pdev)
	{
	struct gpio_chip *gc;
	struct resource *iores;
	struct xlp_gpio_priv *priv;
	void __iomem *gpio_base;
	int irq_base, irq, err;
	int ngpio;
	u32 soc_type;

	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iores)
	return -ENODEV;

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

	gpio_base = devm_ioremap_resource(&pdev->dev, iores);
	if (IS_ERR(gpio_base))
	return PTR_ERR(gpio_base);

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;

	if (pdev->dev.of_node) {
	soc_type = (uintptr_t)of_device_get_match_data(&pdev->dev);
	} else {
	const struct acpi_device_id *acpi_id;

	acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
	&pdev->dev);
	if (!acpi_id \|\| !acpi_id->driver_data) {
	dev_err(&pdev->dev, "Unable to match ACPI ID\n");
	return -ENODEV;
	}
	soc_type = (uintptr_t) acpi_id->driver_data;
	}

	switch (soc_type) {
	case XLP_GPIO_VARIANT_XLP832:
	priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
	priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
	priv->gpio_intr_stat = gpio_base + GPIO_INT_STAT;
	priv->gpio_intr_type = gpio_base + GPIO_INT_TYPE;
	priv->gpio_intr_pol = gpio_base + GPIO_INT_POL;
	priv->gpio_intr_en = gpio_base + GPIO_INT_EN00;
	ngpio = 41;
	break;
	case XLP_GPIO_VARIANT_XLP208:
	case XLP_GPIO_VARIANT_XLP316:
	priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
	priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
	priv->gpio_intr_stat = gpio_base + GPIO_3XX_INT_STAT;
	priv->gpio_intr_type = gpio_base + GPIO_3XX_INT_TYPE;
	priv->gpio_intr_pol = gpio_base + GPIO_3XX_INT_POL;
	priv->gpio_intr_en = gpio_base + GPIO_3XX_INT_EN00;

	ngpio = (soc_type == XLP_GPIO_VARIANT_XLP208) ? 42 : 57;
	break;
	case XLP_GPIO_VARIANT_XLP980:
	case XLP_GPIO_VARIANT_XLP532:
	case GPIO_VARIANT_VULCAN:
	priv->gpio_out_en = gpio_base + GPIO_9XX_OUTPUT_EN;
	priv->gpio_paddrv = gpio_base + GPIO_9XX_PADDRV;
	priv->gpio_intr_stat = gpio_base + GPIO_9XX_INT_STAT;
	priv->gpio_intr_type = gpio_base + GPIO_9XX_INT_TYPE;
	priv->gpio_intr_pol = gpio_base + GPIO_9XX_INT_POL;
	priv->gpio_intr_en = gpio_base + GPIO_9XX_INT_EN00;

	if (soc_type == XLP_GPIO_VARIANT_XLP980)
	ngpio = 66;
	else if (soc_type == XLP_GPIO_VARIANT_XLP532)
	ngpio = 67;
	else
	ngpio = 70;
	break;
	default:
	dev_err(&pdev->dev, "Unknown Processor type!\n");
	return -ENODEV;
	}

	bitmap_zero(priv->gpio_enabled_mask, XLP_MAX_NR_GPIO);

	gc = &priv->chip;

	gc->owner = THIS_MODULE;
	gc->label = dev_name(&pdev->dev);
	gc->base = 0;
	gc->parent = &pdev->dev;
	gc->ngpio = ngpio;
	gc->of_node = pdev->dev.of_node;
	gc->direction_output = xlp_gpio_dir_output;
	gc->direction_input = xlp_gpio_dir_input;
	gc->set = xlp_gpio_set;
	gc->get = xlp_gpio_get;

	spin_lock_init(&priv->lock);

	/* XLP(MIPS) has fixed range for GPIO IRQs, Vulcan(ARM64) does not */
	if (soc_type != GPIO_VARIANT_VULCAN) {
	irq_base = devm_irq_alloc_descs(&pdev->dev, -1,
	XLP_GPIO_IRQ_BASE,
	gc->ngpio, 0);
	if (irq_base < 0) {
	dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
	return irq_base;
	}
	} else {
	irq_base = 0;
	}

	err = gpiochip_add_data(gc, priv);
	if (err < 0)
	return err;

	err = gpiochip_irqchip_add(gc, &xlp_gpio_irq_chip, irq_base,
	handle_level_irq, IRQ_TYPE_NONE);
	if (err) {
	dev_err(&pdev->dev, "Could not connect irqchip to gpiochip!\n");
	goto out_gpio_remove;
	}

	gpiochip_set_chained_irqchip(gc, &xlp_gpio_irq_chip, irq,
	xlp_gpio_generic_handler);

	dev_info(&pdev->dev, "registered %d GPIOs\n", gc->ngpio);

	return 0;

	out_gpio_remove:
	gpiochip_remove(gc);
	return err;
	}

	#ifdef CONFIG_ACPI
	static const struct acpi_device_id xlp_gpio_acpi_match[] = {
	{ "BRCM9006", GPIO_VARIANT_VULCAN },
	{ "CAV9006", GPIO_VARIANT_VULCAN },
	{},
	};
	MODULE_DEVICE_TABLE(acpi, xlp_gpio_acpi_match);
	#endif

	static struct platform_driver xlp_gpio_driver = {
	.driver = {
	.name = "xlp-gpio",
	.of_match_table = xlp_gpio_of_ids,
	.acpi_match_table = ACPI_PTR(xlp_gpio_acpi_match),
	},
	.probe = xlp_gpio_probe,
	};
	module_platform_driver(xlp_gpio_driver);

	MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
	MODULE_AUTHOR("Ganesan Ramalingam <ganesanr@broadcom.com>");
	MODULE_DESCRIPTION("Netlogic XLP GPIO Driver");
	MODULE_LICENSE("GPL v2");