drivers/gpio/gpio-pch.c - kernel/msm-4.19 - Gitiles

 /*
  * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
  *
  * 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; 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/module.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/gpio.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/slab.h>

 #define PCH_EDGE_FALLING	0
 #define PCH_EDGE_RISING		BIT(0)
 #define PCH_LEVEL_L		BIT(1)
 #define PCH_LEVEL_H		(BIT(0) | BIT(1))
 #define PCH_EDGE_BOTH		BIT(2)
 #define PCH_IM_MASK		(BIT(0) | BIT(1) | BIT(2))

 #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 |= (1 << nr);
 	else
 		reg_val &= ~(1 << 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) >> nr) & 1;
 }

 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 |= (1 << nr);
 	else
 		reg_val &= ~(1 << nr);
 	iowrite32(reg_val, &chip->reg->po);

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

 	return 0;
 }

 #ifdef CONFIG_PM
 /*
  * Save register configuration and disable interrupts.
  */
 static void 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 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);
 }
 #endif

 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->dbg_show = NULL;
 	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 + 7) {
 		im_reg = &chip->reg->im0;
 		im_pos = ch;
 	} else {
 		im_reg = &chip->reg->im1;
 		im_pos = ch - 8;
 	}
 	dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d\n",
 		__func__, irq, type, ch, im_pos);

 	spin_lock_irqsave(&chip->spinlock, flags);

 	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:
 		goto unlock;
 	}

 	/* 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_LOW | IRQ_TYPE_LEVEL_HIGH))
 		irq_set_handler_locked(d, handle_level_irq);
 	else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
 		irq_set_handler_locked(d, handle_edge_irq);

 unlock:
 	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(1 << (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(1 << (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(1 << (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;
 	u32 reg_val = ioread32(&chip->reg->istatus);
 	int i, ret = IRQ_NONE;

 	for (i = 0; i < gpio_pins[chip->ioh]; i++) {
 		if (reg_val & BIT(i)) {
 			dev_dbg(chip->dev, "%s:[%d]:irq=%d  status=0x%x\n",
 				__func__, i, irq, reg_val);
 			generic_handle_irq(chip->irq_base + i);
 			ret = IRQ_HANDLED;
 		}
 	}
 	return ret;
 }

 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;

 	gc = irq_alloc_generic_chip("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;

 	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
 			       IRQ_NOREQUEST | IRQ_NOPROBE, 0);

 	return 0;
 }

 static int pch_gpio_probe(struct pci_dev *pdev,
 				    const struct pci_device_id *id)
 {
 	s32 ret;
 	struct pch_gpio *chip;
 	int irq_base;
 	u32 msk;

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

 	chip->dev = &pdev->dev;
 	ret = pci_enable_device(pdev);
 	if (ret) {
 		dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__);
 		goto err_pci_enable;
 	}

 	ret = pci_request_regions(pdev, KBUILD_MODNAME);
 	if (ret) {
 		dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
 		goto err_request_regions;
 	}

 	chip->base = pci_iomap(pdev, 1, 0);
 	if (!chip->base) {
 		dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__);
 		ret = -ENOMEM;
 		goto err_iomap;
 	}

 	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);
 #ifdef CONFIG_OF_GPIO
 	chip->gpio.of_node = pdev->dev.of_node;
 #endif
 	ret = gpiochip_add_data(&chip->gpio, chip);
 	if (ret) {
 		dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
 		goto err_gpiochip_add;
 	}

 	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;
 		goto end;
 	}
 	chip->irq_base = irq_base;

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

 	ret = devm_request_irq(&pdev->dev, pdev->irq, pch_gpio_handler,
 			       IRQF_SHARED, KBUILD_MODNAME, chip);
 	if (ret != 0) {
 		dev_err(&pdev->dev,
 			"%s request_irq failed\n", __func__);
 		goto err_request_irq;
 	}

 	ret = pch_gpio_alloc_generic_chip(chip, irq_base,
 					  gpio_pins[chip->ioh]);
 	if (ret)
 		goto err_request_irq;

 end:
 	return 0;

 err_request_irq:
 	gpiochip_remove(&chip->gpio);

 err_gpiochip_add:
 	pci_iounmap(pdev, chip->base);

 err_iomap:
 	pci_release_regions(pdev);

 err_request_regions:
 	pci_disable_device(pdev);

 err_pci_enable:
 	kfree(chip);
 	dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
 	return ret;
 }

 static void pch_gpio_remove(struct pci_dev *pdev)
 {
 	struct pch_gpio *chip = pci_get_drvdata(pdev);

 	gpiochip_remove(&chip->gpio);
 	pci_iounmap(pdev, chip->base);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 	kfree(chip);
 }

 #ifdef CONFIG_PM
 static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
 {
 	s32 ret;
 	struct pch_gpio *chip = pci_get_drvdata(pdev);
 	unsigned long flags;

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

 	ret = pci_save_state(pdev);
 	if (ret) {
 		dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
 		return ret;
 	}
 	pci_disable_device(pdev);
 	pci_set_power_state(pdev, PCI_D0);
 	ret = pci_enable_wake(pdev, PCI_D0, 1);
 	if (ret)
 		dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);

 	return 0;
 }

 static int pch_gpio_resume(struct pci_dev *pdev)
 {
 	s32 ret;
 	struct pch_gpio *chip = pci_get_drvdata(pdev);
 	unsigned long flags;

 	ret = pci_enable_wake(pdev, PCI_D0, 0);

 	pci_set_power_state(pdev, PCI_D0);
 	ret = pci_enable_device(pdev);
 	if (ret) {
 		dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
 		return ret;
 	}
 	pci_restore_state(pdev);

 	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;
 }
 #else
 #define pch_gpio_suspend NULL
 #define pch_gpio_resume NULL
 #endif

 #define PCI_VENDOR_ID_ROHM             0x10DB
 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,
 	.remove = pch_gpio_remove,
 	.suspend = pch_gpio_suspend,
 	.resume = pch_gpio_resume
 };

 module_pci_driver(pch_gpio_driver);

 MODULE_DESCRIPTION("PCH GPIO PCI Driver");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
	*
	* 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; 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/module.h>
	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/gpio.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/slab.h>

	#define PCH_EDGE_FALLING 0
	#define PCH_EDGE_RISING BIT(0)
	#define PCH_LEVEL_L BIT(1)
	#define PCH_LEVEL_H (BIT(0) \| BIT(1))
	#define PCH_EDGE_BOTH BIT(2)
	#define PCH_IM_MASK (BIT(0) \| BIT(1) \| BIT(2))

	#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 \|= (1 << nr);
	else
	reg_val &= ~(1 << 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) >> nr) & 1;
	}

	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 \|= (1 << nr);
	else
	reg_val &= ~(1 << nr);
	iowrite32(reg_val, &chip->reg->po);

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

	return 0;
	}

	#ifdef CONFIG_PM
	/*
	* Save register configuration and disable interrupts.
	*/
	static void 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 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);
	}
	#endif

	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->dbg_show = NULL;
	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 + 7) {
	im_reg = &chip->reg->im0;
	im_pos = ch;
	} else {
	im_reg = &chip->reg->im1;
	im_pos = ch - 8;
	}
	dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d\n",
	__func__, irq, type, ch, im_pos);

	spin_lock_irqsave(&chip->spinlock, flags);

	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:
	goto unlock;
	}

	/* 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_LOW \| IRQ_TYPE_LEVEL_HIGH))
	irq_set_handler_locked(d, handle_level_irq);
	else if (type & (IRQ_TYPE_EDGE_FALLING \| IRQ_TYPE_EDGE_RISING))
	irq_set_handler_locked(d, handle_edge_irq);

	unlock:
	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(1 << (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(1 << (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(1 << (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;
	u32 reg_val = ioread32(&chip->reg->istatus);
	int i, ret = IRQ_NONE;

	for (i = 0; i < gpio_pins[chip->ioh]; i++) {
	if (reg_val & BIT(i)) {
	dev_dbg(chip->dev, "%s:[%d]:irq=%d status=0x%x\n",
	__func__, i, irq, reg_val);
	generic_handle_irq(chip->irq_base + i);
	ret = IRQ_HANDLED;
	}
	}
	return ret;
	}

	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;

	gc = irq_alloc_generic_chip("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;

	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
	IRQ_NOREQUEST \| IRQ_NOPROBE, 0);

	return 0;
	}

	static int pch_gpio_probe(struct pci_dev *pdev,
	const struct pci_device_id *id)
	{
	s32 ret;
	struct pch_gpio *chip;
	int irq_base;
	u32 msk;

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

	chip->dev = &pdev->dev;
	ret = pci_enable_device(pdev);
	if (ret) {
	dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__);
	goto err_pci_enable;
	}

	ret = pci_request_regions(pdev, KBUILD_MODNAME);
	if (ret) {
	dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
	goto err_request_regions;
	}

	chip->base = pci_iomap(pdev, 1, 0);
	if (!chip->base) {
	dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__);
	ret = -ENOMEM;
	goto err_iomap;
	}

	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);
	#ifdef CONFIG_OF_GPIO
	chip->gpio.of_node = pdev->dev.of_node;
	#endif
	ret = gpiochip_add_data(&chip->gpio, chip);
	if (ret) {
	dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
	goto err_gpiochip_add;
	}

	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;
	goto end;
	}
	chip->irq_base = irq_base;

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

	ret = devm_request_irq(&pdev->dev, pdev->irq, pch_gpio_handler,
	IRQF_SHARED, KBUILD_MODNAME, chip);
	if (ret != 0) {
	dev_err(&pdev->dev,
	"%s request_irq failed\n", __func__);
	goto err_request_irq;
	}

	ret = pch_gpio_alloc_generic_chip(chip, irq_base,
	gpio_pins[chip->ioh]);
	if (ret)
	goto err_request_irq;

	end:
	return 0;

	err_request_irq:
	gpiochip_remove(&chip->gpio);

	err_gpiochip_add:
	pci_iounmap(pdev, chip->base);

	err_iomap:
	pci_release_regions(pdev);

	err_request_regions:
	pci_disable_device(pdev);

	err_pci_enable:
	kfree(chip);
	dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
	return ret;
	}

	static void pch_gpio_remove(struct pci_dev *pdev)
	{
	struct pch_gpio *chip = pci_get_drvdata(pdev);

	gpiochip_remove(&chip->gpio);
	pci_iounmap(pdev, chip->base);
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	kfree(chip);
	}

	#ifdef CONFIG_PM
	static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
	{
	s32 ret;
	struct pch_gpio *chip = pci_get_drvdata(pdev);
	unsigned long flags;

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

	ret = pci_save_state(pdev);
	if (ret) {
	dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
	return ret;
	}
	pci_disable_device(pdev);
	pci_set_power_state(pdev, PCI_D0);
	ret = pci_enable_wake(pdev, PCI_D0, 1);
	if (ret)
	dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);

	return 0;
	}

	static int pch_gpio_resume(struct pci_dev *pdev)
	{
	s32 ret;
	struct pch_gpio *chip = pci_get_drvdata(pdev);
	unsigned long flags;

	ret = pci_enable_wake(pdev, PCI_D0, 0);

	pci_set_power_state(pdev, PCI_D0);
	ret = pci_enable_device(pdev);
	if (ret) {
	dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
	return ret;
	}
	pci_restore_state(pdev);

	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;
	}
	#else
	#define pch_gpio_suspend NULL
	#define pch_gpio_resume NULL
	#endif

	#define PCI_VENDOR_ID_ROHM 0x10DB
	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,
	.remove = pch_gpio_remove,
	.suspend = pch_gpio_suspend,
	.resume = pch_gpio_resume
	};

	module_pci_driver(pch_gpio_driver);

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