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

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
  */
 #include <linux/bits.h>
 #include <linux/gpio/driver.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/slab.h>

 #define PCH_EDGE_FALLING	0
 #define PCH_EDGE_RISING		1
 #define PCH_LEVEL_L		2
 #define PCH_LEVEL_H		3
 #define PCH_EDGE_BOTH		4
 #define PCH_IM_MASK		GENMASK(2, 0)

 #define PCH_IRQ_BASE		24

 struct pch_regs {
 	u32	ien;
 	u32	istatus;
 	u32	idisp;
 	u32	iclr;
 	u32	imask;
 	u32	imaskclr;
 	u32	po;
 	u32	pi;
 	u32	pm;
 	u32	im0;
 	u32	im1;
 	u32	reserved[3];
 	u32	gpio_use_sel;
 	u32	reset;
 };

 enum pch_type_t {
 	INTEL_EG20T_PCH,
 	OKISEMI_ML7223m_IOH, /* LAPIS Semiconductor ML7223 IOH PCIe Bus-m */
 	OKISEMI_ML7223n_IOH  /* LAPIS Semiconductor ML7223 IOH PCIe Bus-n */
 };

 /* Specifies number of GPIO PINS */
 static int gpio_pins[] = {
 	[INTEL_EG20T_PCH] = 12,
 	[OKISEMI_ML7223m_IOH] = 8,
 	[OKISEMI_ML7223n_IOH] = 8,
 };

 /**
  * struct pch_gpio_reg_data - The register store data.
  * @ien_reg:	To store contents of IEN register.
  * @imask_reg:	To store contents of IMASK register.
  * @po_reg:	To store contents of PO register.
  * @pm_reg:	To store contents of PM register.
  * @im0_reg:	To store contents of IM0 register.
  * @im1_reg:	To store contents of IM1 register.
  * @gpio_use_sel_reg : To store contents of GPIO_USE_SEL register.
  *		       (Only ML7223 Bus-n)
  */
 struct pch_gpio_reg_data {
 	u32 ien_reg;
 	u32 imask_reg;
 	u32 po_reg;
 	u32 pm_reg;
 	u32 im0_reg;
 	u32 im1_reg;
 	u32 gpio_use_sel_reg;
 };

 /**
  * struct pch_gpio - GPIO private data structure.
  * @base:			PCI base address of Memory mapped I/O register.
  * @reg:			Memory mapped PCH GPIO register list.
  * @dev:			Pointer to device structure.
  * @gpio:			Data for GPIO infrastructure.
  * @pch_gpio_reg:		Memory mapped Register data is saved here
  *				when suspend.
  * @lock:			Used for register access protection
  * @irq_base:		Save base of IRQ number for interrupt
  * @ioh:		IOH ID
  * @spinlock:		Used for register access protection
  */
 struct pch_gpio {
 	void __iomem *base;
 	struct pch_regs __iomem *reg;
 	struct device *dev;
 	struct gpio_chip gpio;
 	struct pch_gpio_reg_data pch_gpio_reg;
 	int irq_base;
 	enum pch_type_t ioh;
 	spinlock_t spinlock;
 };

 static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
 {
 	u32 reg_val;
 	struct pch_gpio *chip =	gpiochip_get_data(gpio);
 	unsigned long flags;

 	spin_lock_irqsave(&chip->spinlock, flags);
 	reg_val = ioread32(&chip->reg->po);
 	if (val)
 		reg_val |= BIT(nr);
 	else
 		reg_val &= ~BIT(nr);

 	iowrite32(reg_val, &chip->reg->po);
 	spin_unlock_irqrestore(&chip->spinlock, flags);
 }

 static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
 {
 	struct pch_gpio *chip =	gpiochip_get_data(gpio);

 	return !!(ioread32(&chip->reg->pi) & BIT(nr));
 }

 static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
 				     int val)
 {
 	struct pch_gpio *chip =	gpiochip_get_data(gpio);
 	u32 pm;
 	u32 reg_val;
 	unsigned long flags;

 	spin_lock_irqsave(&chip->spinlock, flags);

 	reg_val = ioread32(&chip->reg->po);
 	if (val)
 		reg_val |= BIT(nr);
 	else
 		reg_val &= ~BIT(nr);
 	iowrite32(reg_val, &chip->reg->po);

 	pm = ioread32(&chip->reg->pm);
 	pm &= BIT(gpio_pins[chip->ioh]) - 1;
 	pm |= BIT(nr);
 	iowrite32(pm, &chip->reg->pm);

 	spin_unlock_irqrestore(&chip->spinlock, flags);

 	return 0;
 }

 static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
 {
 	struct pch_gpio *chip =	gpiochip_get_data(gpio);
 	u32 pm;
 	unsigned long flags;

 	spin_lock_irqsave(&chip->spinlock, flags);
 	pm = ioread32(&chip->reg->pm);
 	pm &= BIT(gpio_pins[chip->ioh]) - 1;
 	pm &= ~BIT(nr);
 	iowrite32(pm, &chip->reg->pm);
 	spin_unlock_irqrestore(&chip->spinlock, flags);

 	return 0;
 }

 /*
  * Save register configuration and disable interrupts.
  */
 static void __maybe_unused pch_gpio_save_reg_conf(struct pch_gpio *chip)
 {
 	chip->pch_gpio_reg.ien_reg = ioread32(&chip->reg->ien);
 	chip->pch_gpio_reg.imask_reg = ioread32(&chip->reg->imask);
 	chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po);
 	chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm);
 	chip->pch_gpio_reg.im0_reg = ioread32(&chip->reg->im0);
 	if (chip->ioh == INTEL_EG20T_PCH)
 		chip->pch_gpio_reg.im1_reg = ioread32(&chip->reg->im1);
 	if (chip->ioh == OKISEMI_ML7223n_IOH)
 		chip->pch_gpio_reg.gpio_use_sel_reg = ioread32(&chip->reg->gpio_use_sel);
 }

 /*
  * This function restores the register configuration of the GPIO device.
  */
 static void __maybe_unused pch_gpio_restore_reg_conf(struct pch_gpio *chip)
 {
 	iowrite32(chip->pch_gpio_reg.ien_reg, &chip->reg->ien);
 	iowrite32(chip->pch_gpio_reg.imask_reg, &chip->reg->imask);
 	/* to store contents of PO register */
 	iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po);
 	/* to store contents of PM register */
 	iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm);
 	iowrite32(chip->pch_gpio_reg.im0_reg, &chip->reg->im0);
 	if (chip->ioh == INTEL_EG20T_PCH)
 		iowrite32(chip->pch_gpio_reg.im1_reg, &chip->reg->im1);
 	if (chip->ioh == OKISEMI_ML7223n_IOH)
 		iowrite32(chip->pch_gpio_reg.gpio_use_sel_reg, &chip->reg->gpio_use_sel);
 }

 static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
 {
 	struct pch_gpio *chip = gpiochip_get_data(gpio);
 	return chip->irq_base + offset;
 }

 static void pch_gpio_setup(struct pch_gpio *chip)
 {
 	struct gpio_chip *gpio = &chip->gpio;

 	gpio->label = dev_name(chip->dev);
 	gpio->parent = chip->dev;
 	gpio->owner = THIS_MODULE;
 	gpio->direction_input = pch_gpio_direction_input;
 	gpio->get = pch_gpio_get;
 	gpio->direction_output = pch_gpio_direction_output;
 	gpio->set = pch_gpio_set;
 	gpio->base = -1;
 	gpio->ngpio = gpio_pins[chip->ioh];
 	gpio->can_sleep = false;
 	gpio->to_irq = pch_gpio_to_irq;
 }

 static int pch_irq_type(struct irq_data *d, unsigned int type)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct pch_gpio *chip = gc->private;
 	u32 im, im_pos, val;
 	u32 __iomem *im_reg;
 	unsigned long flags;
 	int ch, irq = d->irq;

 	ch = irq - chip->irq_base;
 	if (irq < chip->irq_base + 8) {
 		im_reg = &chip->reg->im0;
 		im_pos = ch - 0;
 	} else {
 		im_reg = &chip->reg->im1;
 		im_pos = ch - 8;
 	}
 	dev_dbg(chip->dev, "irq=%d type=%d ch=%d pos=%d\n", irq, type, ch, im_pos);

 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
 		val = PCH_EDGE_RISING;
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		val = PCH_EDGE_FALLING;
 		break;
 	case IRQ_TYPE_EDGE_BOTH:
 		val = PCH_EDGE_BOTH;
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		val = PCH_LEVEL_H;
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		val = PCH_LEVEL_L;
 		break;
 	default:
 		return 0;
 	}

 	spin_lock_irqsave(&chip->spinlock, flags);

 	/* Set interrupt mode */
 	im = ioread32(im_reg) & ~(PCH_IM_MASK << (im_pos * 4));
 	iowrite32(im | (val << (im_pos * 4)), im_reg);

 	/* And the handler */
 	if (type & IRQ_TYPE_LEVEL_MASK)
 		irq_set_handler_locked(d, handle_level_irq);
 	else if (type & IRQ_TYPE_EDGE_BOTH)
 		irq_set_handler_locked(d, handle_edge_irq);

 	spin_unlock_irqrestore(&chip->spinlock, flags);
 	return 0;
 }

 static void pch_irq_unmask(struct irq_data *d)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct pch_gpio *chip = gc->private;

 	iowrite32(BIT(d->irq - chip->irq_base), &chip->reg->imaskclr);
 }

 static void pch_irq_mask(struct irq_data *d)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct pch_gpio *chip = gc->private;

 	iowrite32(BIT(d->irq - chip->irq_base), &chip->reg->imask);
 }

 static void pch_irq_ack(struct irq_data *d)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct pch_gpio *chip = gc->private;

 	iowrite32(BIT(d->irq - chip->irq_base), &chip->reg->iclr);
 }

 static irqreturn_t pch_gpio_handler(int irq, void *dev_id)
 {
 	struct pch_gpio *chip = dev_id;
 	unsigned long reg_val = ioread32(&chip->reg->istatus);
 	int i;

 	dev_dbg(chip->dev, "irq=%d  status=0x%lx\n", irq, reg_val);

 	reg_val &= BIT(gpio_pins[chip->ioh]) - 1;
 	for_each_set_bit(i, &reg_val, gpio_pins[chip->ioh])
 		generic_handle_irq(chip->irq_base + i);

 	return IRQ_RETVAL(reg_val);
 }

 static int pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
 				       unsigned int irq_start,
 				       unsigned int num)
 {
 	struct irq_chip_generic *gc;
 	struct irq_chip_type *ct;
 	int rv;

 	gc = devm_irq_alloc_generic_chip(chip->dev, "pch_gpio", 1, irq_start,
 					 chip->base, handle_simple_irq);
 	if (!gc)
 		return -ENOMEM;

 	gc->private = chip;
 	ct = gc->chip_types;

 	ct->chip.irq_ack = pch_irq_ack;
 	ct->chip.irq_mask = pch_irq_mask;
 	ct->chip.irq_unmask = pch_irq_unmask;
 	ct->chip.irq_set_type = pch_irq_type;

 	rv = devm_irq_setup_generic_chip(chip->dev, gc, IRQ_MSK(num),
 					 IRQ_GC_INIT_MASK_CACHE,
 					 IRQ_NOREQUEST | IRQ_NOPROBE, 0);

 	return rv;
 }

 static int pch_gpio_probe(struct pci_dev *pdev,
 				    const struct pci_device_id *id)
 {
 	s32 ret;
 	struct pch_gpio *chip;
 	int irq_base;

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

 	chip->dev = &pdev->dev;
 	ret = pcim_enable_device(pdev);
 	if (ret) {
 		dev_err(&pdev->dev, "pci_enable_device FAILED");
 		return ret;
 	}

 	ret = pcim_iomap_regions(pdev, BIT(1), KBUILD_MODNAME);
 	if (ret) {
 		dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
 		return ret;
 	}

 	chip->base = pcim_iomap_table(pdev)[1];

 	if (pdev->device == 0x8803)
 		chip->ioh = INTEL_EG20T_PCH;
 	else if (pdev->device == 0x8014)
 		chip->ioh = OKISEMI_ML7223m_IOH;
 	else if (pdev->device == 0x8043)
 		chip->ioh = OKISEMI_ML7223n_IOH;

 	chip->reg = chip->base;
 	pci_set_drvdata(pdev, chip);
 	spin_lock_init(&chip->spinlock);
 	pch_gpio_setup(chip);

 	ret = devm_gpiochip_add_data(&pdev->dev, &chip->gpio, chip);
 	if (ret) {
 		dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
 		return ret;
 	}

 	irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0,
 					gpio_pins[chip->ioh], NUMA_NO_NODE);
 	if (irq_base < 0) {
 		dev_warn(&pdev->dev, "PCH gpio: Failed to get IRQ base num\n");
 		chip->irq_base = -1;
 		return 0;
 	}
 	chip->irq_base = irq_base;

 	/* Mask all interrupts, but enable them */
 	iowrite32(BIT(gpio_pins[chip->ioh]) - 1, &chip->reg->imask);
 	iowrite32(BIT(gpio_pins[chip->ioh]) - 1, &chip->reg->ien);

 	ret = devm_request_irq(&pdev->dev, pdev->irq, pch_gpio_handler,
 			       IRQF_SHARED, KBUILD_MODNAME, chip);
 	if (ret) {
 		dev_err(&pdev->dev, "request_irq failed\n");
 		return ret;
 	}

 	return pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]);
 }

 static int __maybe_unused pch_gpio_suspend(struct device *dev)
 {
 	struct pch_gpio *chip = dev_get_drvdata(dev);
 	unsigned long flags;

 	spin_lock_irqsave(&chip->spinlock, flags);
 	pch_gpio_save_reg_conf(chip);
 	spin_unlock_irqrestore(&chip->spinlock, flags);

 	return 0;
 }

 static int __maybe_unused pch_gpio_resume(struct device *dev)
 {
 	struct pch_gpio *chip = dev_get_drvdata(dev);
 	unsigned long flags;

 	spin_lock_irqsave(&chip->spinlock, flags);
 	iowrite32(0x01, &chip->reg->reset);
 	iowrite32(0x00, &chip->reg->reset);
 	pch_gpio_restore_reg_conf(chip);
 	spin_unlock_irqrestore(&chip->spinlock, flags);

 	return 0;
 }

 static SIMPLE_DEV_PM_OPS(pch_gpio_pm_ops, pch_gpio_suspend, pch_gpio_resume);

 static const struct pci_device_id pch_gpio_pcidev_id[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8014) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8043) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8803) },
 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id);

 static struct pci_driver pch_gpio_driver = {
 	.name = "pch_gpio",
 	.id_table = pch_gpio_pcidev_id,
 	.probe = pch_gpio_probe,
 	.driver = {
 		.pm = &pch_gpio_pm_ops,
 	},
 };

 module_pci_driver(pch_gpio_driver);

 MODULE_DESCRIPTION("PCH GPIO PCI Driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
	*/
	#include <linux/bits.h>
	#include <linux/gpio/driver.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/slab.h>

	#define PCH_EDGE_FALLING 0
	#define PCH_EDGE_RISING 1
	#define PCH_LEVEL_L 2
	#define PCH_LEVEL_H 3
	#define PCH_EDGE_BOTH 4
	#define PCH_IM_MASK GENMASK(2, 0)

	#define PCH_IRQ_BASE 24

	struct pch_regs {
	u32 ien;
	u32 istatus;
	u32 idisp;
	u32 iclr;
	u32 imask;
	u32 imaskclr;
	u32 po;
	u32 pi;
	u32 pm;
	u32 im0;
	u32 im1;
	u32 reserved[3];
	u32 gpio_use_sel;
	u32 reset;
	};

	enum pch_type_t {
	INTEL_EG20T_PCH,
	OKISEMI_ML7223m_IOH, /* LAPIS Semiconductor ML7223 IOH PCIe Bus-m */
	OKISEMI_ML7223n_IOH /* LAPIS Semiconductor ML7223 IOH PCIe Bus-n */
	};

	/* Specifies number of GPIO PINS */
	static int gpio_pins[] = {
	[INTEL_EG20T_PCH] = 12,
	[OKISEMI_ML7223m_IOH] = 8,
	[OKISEMI_ML7223n_IOH] = 8,
	};

	/**
	* struct pch_gpio_reg_data - The register store data.
	* @ien_reg: To store contents of IEN register.
	* @imask_reg: To store contents of IMASK register.
	* @po_reg: To store contents of PO register.
	* @pm_reg: To store contents of PM register.
	* @im0_reg: To store contents of IM0 register.
	* @im1_reg: To store contents of IM1 register.
	* @gpio_use_sel_reg : To store contents of GPIO_USE_SEL register.
	* (Only ML7223 Bus-n)
	*/
	struct pch_gpio_reg_data {
	u32 ien_reg;
	u32 imask_reg;
	u32 po_reg;
	u32 pm_reg;
	u32 im0_reg;
	u32 im1_reg;
	u32 gpio_use_sel_reg;
	};

	/**
	* struct pch_gpio - GPIO private data structure.
	* @base: PCI base address of Memory mapped I/O register.
	* @reg: Memory mapped PCH GPIO register list.
	* @dev: Pointer to device structure.
	* @gpio: Data for GPIO infrastructure.
	* @pch_gpio_reg: Memory mapped Register data is saved here
	* when suspend.
	* @lock: Used for register access protection
	* @irq_base: Save base of IRQ number for interrupt
	* @ioh: IOH ID
	* @spinlock: Used for register access protection
	*/
	struct pch_gpio {
	void __iomem *base;
	struct pch_regs __iomem *reg;
	struct device *dev;
	struct gpio_chip gpio;
	struct pch_gpio_reg_data pch_gpio_reg;
	int irq_base;
	enum pch_type_t ioh;
	spinlock_t spinlock;
	};

	static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
	{
	u32 reg_val;
	struct pch_gpio *chip = gpiochip_get_data(gpio);
	unsigned long flags;

	spin_lock_irqsave(&chip->spinlock, flags);
	reg_val = ioread32(&chip->reg->po);
	if (val)
	reg_val \|= BIT(nr);
	else
	reg_val &= ~BIT(nr);

	iowrite32(reg_val, &chip->reg->po);
	spin_unlock_irqrestore(&chip->spinlock, flags);
	}

	static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
	{
	struct pch_gpio *chip = gpiochip_get_data(gpio);

	return !!(ioread32(&chip->reg->pi) & BIT(nr));
	}

	static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
	int val)
	{
	struct pch_gpio *chip = gpiochip_get_data(gpio);
	u32 pm;
	u32 reg_val;
	unsigned long flags;

	spin_lock_irqsave(&chip->spinlock, flags);

	reg_val = ioread32(&chip->reg->po);
	if (val)
	reg_val \|= BIT(nr);
	else
	reg_val &= ~BIT(nr);
	iowrite32(reg_val, &chip->reg->po);

	pm = ioread32(&chip->reg->pm);
	pm &= BIT(gpio_pins[chip->ioh]) - 1;
	pm \|= BIT(nr);
	iowrite32(pm, &chip->reg->pm);

	spin_unlock_irqrestore(&chip->spinlock, flags);

	return 0;
	}

	static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
	{
	struct pch_gpio *chip = gpiochip_get_data(gpio);
	u32 pm;
	unsigned long flags;

	spin_lock_irqsave(&chip->spinlock, flags);
	pm = ioread32(&chip->reg->pm);
	pm &= BIT(gpio_pins[chip->ioh]) - 1;
	pm &= ~BIT(nr);
	iowrite32(pm, &chip->reg->pm);
	spin_unlock_irqrestore(&chip->spinlock, flags);

	return 0;
	}

	/*
	* Save register configuration and disable interrupts.
	*/
	static void __maybe_unused pch_gpio_save_reg_conf(struct pch_gpio *chip)
	{
	chip->pch_gpio_reg.ien_reg = ioread32(&chip->reg->ien);
	chip->pch_gpio_reg.imask_reg = ioread32(&chip->reg->imask);
	chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po);
	chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm);
	chip->pch_gpio_reg.im0_reg = ioread32(&chip->reg->im0);
	if (chip->ioh == INTEL_EG20T_PCH)
	chip->pch_gpio_reg.im1_reg = ioread32(&chip->reg->im1);
	if (chip->ioh == OKISEMI_ML7223n_IOH)
	chip->pch_gpio_reg.gpio_use_sel_reg = ioread32(&chip->reg->gpio_use_sel);
	}

	/*
	* This function restores the register configuration of the GPIO device.
	*/
	static void __maybe_unused pch_gpio_restore_reg_conf(struct pch_gpio *chip)
	{
	iowrite32(chip->pch_gpio_reg.ien_reg, &chip->reg->ien);
	iowrite32(chip->pch_gpio_reg.imask_reg, &chip->reg->imask);
	/* to store contents of PO register */
	iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po);
	/* to store contents of PM register */
	iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm);
	iowrite32(chip->pch_gpio_reg.im0_reg, &chip->reg->im0);
	if (chip->ioh == INTEL_EG20T_PCH)
	iowrite32(chip->pch_gpio_reg.im1_reg, &chip->reg->im1);
	if (chip->ioh == OKISEMI_ML7223n_IOH)
	iowrite32(chip->pch_gpio_reg.gpio_use_sel_reg, &chip->reg->gpio_use_sel);
	}

	static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
	{
	struct pch_gpio *chip = gpiochip_get_data(gpio);
	return chip->irq_base + offset;
	}

	static void pch_gpio_setup(struct pch_gpio *chip)
	{
	struct gpio_chip *gpio = &chip->gpio;

	gpio->label = dev_name(chip->dev);
	gpio->parent = chip->dev;
	gpio->owner = THIS_MODULE;
	gpio->direction_input = pch_gpio_direction_input;
	gpio->get = pch_gpio_get;
	gpio->direction_output = pch_gpio_direction_output;
	gpio->set = pch_gpio_set;
	gpio->base = -1;
	gpio->ngpio = gpio_pins[chip->ioh];
	gpio->can_sleep = false;
	gpio->to_irq = pch_gpio_to_irq;
	}

	static int pch_irq_type(struct irq_data *d, unsigned int type)
	{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct pch_gpio *chip = gc->private;
	u32 im, im_pos, val;
	u32 __iomem *im_reg;
	unsigned long flags;
	int ch, irq = d->irq;

	ch = irq - chip->irq_base;
	if (irq < chip->irq_base + 8) {
	im_reg = &chip->reg->im0;
	im_pos = ch - 0;
	} else {
	im_reg = &chip->reg->im1;
	im_pos = ch - 8;
	}
	dev_dbg(chip->dev, "irq=%d type=%d ch=%d pos=%d\n", irq, type, ch, im_pos);

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
	val = PCH_EDGE_RISING;
	break;
	case IRQ_TYPE_EDGE_FALLING:
	val = PCH_EDGE_FALLING;
	break;
	case IRQ_TYPE_EDGE_BOTH:
	val = PCH_EDGE_BOTH;
	break;
	case IRQ_TYPE_LEVEL_HIGH:
	val = PCH_LEVEL_H;
	break;
	case IRQ_TYPE_LEVEL_LOW:
	val = PCH_LEVEL_L;
	break;
	default:
	return 0;
	}

	spin_lock_irqsave(&chip->spinlock, flags);

	/* Set interrupt mode */
	im = ioread32(im_reg) & ~(PCH_IM_MASK << (im_pos * 4));
	iowrite32(im \| (val << (im_pos * 4)), im_reg);

	/* And the handler */
	if (type & IRQ_TYPE_LEVEL_MASK)
	irq_set_handler_locked(d, handle_level_irq);
	else if (type & IRQ_TYPE_EDGE_BOTH)
	irq_set_handler_locked(d, handle_edge_irq);

	spin_unlock_irqrestore(&chip->spinlock, flags);
	return 0;
	}

	static void pch_irq_unmask(struct irq_data *d)
	{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct pch_gpio *chip = gc->private;

	iowrite32(BIT(d->irq - chip->irq_base), &chip->reg->imaskclr);
	}

	static void pch_irq_mask(struct irq_data *d)
	{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct pch_gpio *chip = gc->private;

	iowrite32(BIT(d->irq - chip->irq_base), &chip->reg->imask);
	}

	static void pch_irq_ack(struct irq_data *d)
	{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct pch_gpio *chip = gc->private;

	iowrite32(BIT(d->irq - chip->irq_base), &chip->reg->iclr);
	}

	static irqreturn_t pch_gpio_handler(int irq, void *dev_id)
	{
	struct pch_gpio *chip = dev_id;
	unsigned long reg_val = ioread32(&chip->reg->istatus);
	int i;

	dev_dbg(chip->dev, "irq=%d status=0x%lx\n", irq, reg_val);

	reg_val &= BIT(gpio_pins[chip->ioh]) - 1;
	for_each_set_bit(i, &reg_val, gpio_pins[chip->ioh])
	generic_handle_irq(chip->irq_base + i);

	return IRQ_RETVAL(reg_val);
	}

	static int pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
	unsigned int irq_start,
	unsigned int num)
	{
	struct irq_chip_generic *gc;
	struct irq_chip_type *ct;
	int rv;

	gc = devm_irq_alloc_generic_chip(chip->dev, "pch_gpio", 1, irq_start,
	chip->base, handle_simple_irq);
	if (!gc)
	return -ENOMEM;

	gc->private = chip;
	ct = gc->chip_types;

	ct->chip.irq_ack = pch_irq_ack;
	ct->chip.irq_mask = pch_irq_mask;
	ct->chip.irq_unmask = pch_irq_unmask;
	ct->chip.irq_set_type = pch_irq_type;

	rv = devm_irq_setup_generic_chip(chip->dev, gc, IRQ_MSK(num),
	IRQ_GC_INIT_MASK_CACHE,
	IRQ_NOREQUEST \| IRQ_NOPROBE, 0);

	return rv;
	}

	static int pch_gpio_probe(struct pci_dev *pdev,
	const struct pci_device_id *id)
	{
	s32 ret;
	struct pch_gpio *chip;
	int irq_base;

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

	chip->dev = &pdev->dev;
	ret = pcim_enable_device(pdev);
	if (ret) {
	dev_err(&pdev->dev, "pci_enable_device FAILED");
	return ret;
	}

	ret = pcim_iomap_regions(pdev, BIT(1), KBUILD_MODNAME);
	if (ret) {
	dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
	return ret;
	}

	chip->base = pcim_iomap_table(pdev)[1];

	if (pdev->device == 0x8803)
	chip->ioh = INTEL_EG20T_PCH;
	else if (pdev->device == 0x8014)
	chip->ioh = OKISEMI_ML7223m_IOH;
	else if (pdev->device == 0x8043)
	chip->ioh = OKISEMI_ML7223n_IOH;

	chip->reg = chip->base;
	pci_set_drvdata(pdev, chip);
	spin_lock_init(&chip->spinlock);
	pch_gpio_setup(chip);

	ret = devm_gpiochip_add_data(&pdev->dev, &chip->gpio, chip);
	if (ret) {
	dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
	return ret;
	}

	irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0,
	gpio_pins[chip->ioh], NUMA_NO_NODE);
	if (irq_base < 0) {
	dev_warn(&pdev->dev, "PCH gpio: Failed to get IRQ base num\n");
	chip->irq_base = -1;
	return 0;
	}
	chip->irq_base = irq_base;

	/* Mask all interrupts, but enable them */
	iowrite32(BIT(gpio_pins[chip->ioh]) - 1, &chip->reg->imask);
	iowrite32(BIT(gpio_pins[chip->ioh]) - 1, &chip->reg->ien);

	ret = devm_request_irq(&pdev->dev, pdev->irq, pch_gpio_handler,
	IRQF_SHARED, KBUILD_MODNAME, chip);
	if (ret) {
	dev_err(&pdev->dev, "request_irq failed\n");
	return ret;
	}

	return pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]);
	}

	static int __maybe_unused pch_gpio_suspend(struct device *dev)
	{
	struct pch_gpio *chip = dev_get_drvdata(dev);
	unsigned long flags;

	spin_lock_irqsave(&chip->spinlock, flags);
	pch_gpio_save_reg_conf(chip);
	spin_unlock_irqrestore(&chip->spinlock, flags);

	return 0;
	}

	static int __maybe_unused pch_gpio_resume(struct device *dev)
	{
	struct pch_gpio *chip = dev_get_drvdata(dev);
	unsigned long flags;

	spin_lock_irqsave(&chip->spinlock, flags);
	iowrite32(0x01, &chip->reg->reset);
	iowrite32(0x00, &chip->reg->reset);
	pch_gpio_restore_reg_conf(chip);
	spin_unlock_irqrestore(&chip->spinlock, flags);

	return 0;
	}

	static SIMPLE_DEV_PM_OPS(pch_gpio_pm_ops, pch_gpio_suspend, pch_gpio_resume);

	static const struct pci_device_id pch_gpio_pcidev_id[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) },
	{ PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8014) },
	{ PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8043) },
	{ PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8803) },
	{ 0, }
	};
	MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id);

	static struct pci_driver pch_gpio_driver = {
	.name = "pch_gpio",
	.id_table = pch_gpio_pcidev_id,
	.probe = pch_gpio_probe,
	.driver = {
	.pm = &pch_gpio_pm_ops,
	},
	};

	module_pci_driver(pch_gpio_driver);

	MODULE_DESCRIPTION("PCH GPIO PCI Driver");
	MODULE_LICENSE("GPL v2");