[mirror_ubuntu-zesty-kernel.git] / drivers / gpio / gpio-merrifield.c

/*
 * Intel Merrifield SoC GPIO driver
 *
 * Copyright (c) 2016 Intel Corporation.
 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
 *
 * 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.
 */

#include <linux/bitops.h>
#include <linux/gpio/driver.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pinctrl/consumer.h>

#define GCCR		0x000	/* controller configuration */
#define GPLR		0x004	/* pin level r/o */
#define GPDR		0x01c	/* pin direction */
#define GPSR		0x034	/* pin set w/o */
#define GPCR		0x04c	/* pin clear w/o */
#define GRER		0x064	/* rising edge detect */
#define GFER		0x07c	/* falling edge detect */
#define GFBR		0x094	/* glitch filter bypass */
#define GIMR		0x0ac	/* interrupt mask */
#define GISR		0x0c4	/* interrupt source */
#define GITR		0x300	/* input type */
#define GLPR		0x318	/* level input polarity */
#define GWMR		0x400	/* wake mask */
#define GWSR		0x418	/* wake source */
#define GSIR		0xc00	/* secure input */

/* Intel Merrifield has 192 GPIO pins */
#define MRFLD_NGPIO	192

struct mrfld_gpio_pinrange {
	unsigned int gpio_base;
	unsigned int pin_base;
	unsigned int npins;
};

#define GPIO_PINRANGE(gstart, gend, pstart)		\
	{						\
		.gpio_base = (gstart),			\
		.pin_base = (pstart),			\
		.npins = (gend) - (gstart) + 1,		\
	}

struct mrfld_gpio {
	struct gpio_chip	chip;
	void __iomem		*reg_base;
	raw_spinlock_t		lock;
	struct device		*dev;
};

static const struct mrfld_gpio_pinrange mrfld_gpio_ranges[] = {
	GPIO_PINRANGE(0, 11, 146),
	GPIO_PINRANGE(12, 13, 144),
	GPIO_PINRANGE(14, 15, 35),
	GPIO_PINRANGE(16, 16, 164),
	GPIO_PINRANGE(17, 18, 105),
	GPIO_PINRANGE(19, 22, 101),
	GPIO_PINRANGE(23, 30, 107),
	GPIO_PINRANGE(32, 43, 67),
	GPIO_PINRANGE(44, 63, 195),
	GPIO_PINRANGE(64, 67, 140),
	GPIO_PINRANGE(68, 69, 165),
	GPIO_PINRANGE(70, 71, 65),
	GPIO_PINRANGE(72, 76, 228),
	GPIO_PINRANGE(77, 86, 37),
	GPIO_PINRANGE(87, 87, 48),
	GPIO_PINRANGE(88, 88, 47),
	GPIO_PINRANGE(89, 96, 49),
	GPIO_PINRANGE(97, 97, 34),
	GPIO_PINRANGE(102, 119, 83),
	GPIO_PINRANGE(120, 123, 79),
	GPIO_PINRANGE(124, 135, 115),
	GPIO_PINRANGE(137, 142, 158),
	GPIO_PINRANGE(154, 163, 24),
	GPIO_PINRANGE(164, 176, 215),
	GPIO_PINRANGE(177, 189, 127),
	GPIO_PINRANGE(190, 191, 178),
};

static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned int offset,
			      unsigned int reg_type_offset)
{
	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	u8 reg = offset / 32;

	return priv->reg_base + reg_type_offset + reg * 4;
}

static int mrfld_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	void __iomem *gplr = gpio_reg(chip, offset, GPLR);

	return !!(readl(gplr) & BIT(offset % 32));
}

static void mrfld_gpio_set(struct gpio_chip *chip, unsigned int offset,
			   int value)
{
	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	void __iomem *gpsr, *gpcr;
	unsigned long flags;

	raw_spin_lock_irqsave(&priv->lock, flags);

	if (value) {
		gpsr = gpio_reg(chip, offset, GPSR);
		writel(BIT(offset % 32), gpsr);
	} else {
		gpcr = gpio_reg(chip, offset, GPCR);
		writel(BIT(offset % 32), gpcr);
	}

	raw_spin_unlock_irqrestore(&priv->lock, flags);
}

static int mrfld_gpio_direction_input(struct gpio_chip *chip,
				      unsigned int offset)
{
	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&priv->lock, flags);

	value = readl(gpdr);
	value &= ~BIT(offset % 32);
	writel(value, gpdr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

static int mrfld_gpio_direction_output(struct gpio_chip *chip,
				       unsigned int offset, int value)
{
	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
	unsigned long flags;

	mrfld_gpio_set(chip, offset, value);

	raw_spin_lock_irqsave(&priv->lock, flags);

	value = readl(gpdr);
	value |= BIT(offset % 32);
	writel(value, gpdr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

static int mrfld_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
{
	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);

	return (readl(gpdr) & BIT(offset % 32)) ? GPIOF_DIR_OUT : GPIOF_DIR_IN;
}

static int mrfld_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
				   unsigned int debounce)
{
	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	void __iomem *gfbr = gpio_reg(chip, offset, GFBR);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&priv->lock, flags);

	if (debounce)
		value = readl(gfbr) & ~BIT(offset % 32);
	else
		value = readl(gfbr) | BIT(offset % 32);
	writel(value, gfbr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

static void mrfld_irq_ack(struct irq_data *d)
{
	struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
	u32 gpio = irqd_to_hwirq(d);
	void __iomem *gisr = gpio_reg(&priv->chip, gpio, GISR);
	unsigned long flags;

	raw_spin_lock_irqsave(&priv->lock, flags);

	writel(BIT(gpio % 32), gisr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);
}

static void mrfld_irq_unmask_mask(struct irq_data *d, bool unmask)
{
	struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
	u32 gpio = irqd_to_hwirq(d);
	void __iomem *gimr = gpio_reg(&priv->chip, gpio, GIMR);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&priv->lock, flags);

	if (unmask)
		value = readl(gimr) | BIT(gpio % 32);
	else
		value = readl(gimr) & ~BIT(gpio % 32);
	writel(value, gimr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);
}

static void mrfld_irq_mask(struct irq_data *d)
{
	mrfld_irq_unmask_mask(d, false);
}

static void mrfld_irq_unmask(struct irq_data *d)
{
	mrfld_irq_unmask_mask(d, true);
}

static int mrfld_irq_set_type(struct irq_data *d, unsigned int type)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct mrfld_gpio *priv = gpiochip_get_data(gc);
	u32 gpio = irqd_to_hwirq(d);
	void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER);
	void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER);
	void __iomem *gitr = gpio_reg(&priv->chip, gpio, GITR);
	void __iomem *glpr = gpio_reg(&priv->chip, gpio, GLPR);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&priv->lock, flags);

	if (type & IRQ_TYPE_EDGE_RISING)
		value = readl(grer) | BIT(gpio % 32);
	else
		value = readl(grer) & ~BIT(gpio % 32);
	writel(value, grer);

	if (type & IRQ_TYPE_EDGE_FALLING)
		value = readl(gfer) | BIT(gpio % 32);
	else
		value = readl(gfer) & ~BIT(gpio % 32);
	writel(value, gfer);

	/*
	 * To prevent glitches from triggering an unintended level interrupt,
	 * configure GLPR register first and then configure GITR.
	 */
	if (type & IRQ_TYPE_LEVEL_LOW)
		value = readl(glpr) | BIT(gpio % 32);
	else
		value = readl(glpr) & ~BIT(gpio % 32);
	writel(value, glpr);

	if (type & IRQ_TYPE_LEVEL_MASK) {
		value = readl(gitr) | BIT(gpio % 32);
		writel(value, gitr);

		irq_set_handler_locked(d, handle_level_irq);
	} else if (type & IRQ_TYPE_EDGE_BOTH) {
		value = readl(gitr) & ~BIT(gpio % 32);
		writel(value, gitr);

		irq_set_handler_locked(d, handle_edge_irq);
	}

	raw_spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

static int mrfld_irq_set_wake(struct irq_data *d, unsigned int on)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct mrfld_gpio *priv = gpiochip_get_data(gc);
	u32 gpio = irqd_to_hwirq(d);
	void __iomem *gwmr = gpio_reg(&priv->chip, gpio, GWMR);
	void __iomem *gwsr = gpio_reg(&priv->chip, gpio, GWSR);
	unsigned long flags;
	u32 value;

	raw_spin_lock_irqsave(&priv->lock, flags);

	/* Clear the existing wake status */
	writel(BIT(gpio % 32), gwsr);

	if (on)
		value = readl(gwmr) | BIT(gpio % 32);
	else
		value = readl(gwmr) & ~BIT(gpio % 32);
	writel(value, gwmr);

	raw_spin_unlock_irqrestore(&priv->lock, flags);

	dev_dbg(priv->dev, "%sable wake for gpio %u\n", on ? "en" : "dis", gpio);
	return 0;
}

static struct irq_chip mrfld_irqchip = {
	.name		= "gpio-merrifield",
	.irq_ack	= mrfld_irq_ack,
	.irq_mask	= mrfld_irq_mask,
	.irq_unmask	= mrfld_irq_unmask,
	.irq_set_type	= mrfld_irq_set_type,
	.irq_set_wake	= mrfld_irq_set_wake,
};

static void mrfld_irq_handler(struct irq_desc *desc)
{
	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
	struct mrfld_gpio *priv = gpiochip_get_data(gc);
	struct irq_chip *irqchip = irq_desc_get_chip(desc);
	unsigned long base, gpio;

	chained_irq_enter(irqchip, desc);

	/* Check GPIO controller to check which pin triggered the interrupt */
	for (base = 0; base < priv->chip.ngpio; base += 32) {
		void __iomem *gisr = gpio_reg(&priv->chip, base, GISR);
		void __iomem *gimr = gpio_reg(&priv->chip, base, GIMR);
		unsigned long pending, enabled;

		pending = readl(gisr);
		enabled = readl(gimr);

		/* Only interrupts that are enabled */
		pending &= enabled;

		for_each_set_bit(gpio, &pending, 32) {
			unsigned int irq;

			irq = irq_find_mapping(gc->irqdomain, base + gpio);
			generic_handle_irq(irq);
		}
	}

	chained_irq_exit(irqchip, desc);
}

static void mrfld_irq_init_hw(struct mrfld_gpio *priv)
{
	void __iomem *reg;
	unsigned int base;

	for (base = 0; base < priv->chip.ngpio; base += 32) {
		/* Clear the rising-edge detect register */
		reg = gpio_reg(&priv->chip, base, GRER);
		writel(0, reg);
		/* Clear the falling-edge detect register */
		reg = gpio_reg(&priv->chip, base, GFER);
		writel(0, reg);
	}
}

static int mrfld_gpio_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	const struct mrfld_gpio_pinrange *range;
	struct mrfld_gpio *priv;
	u32 gpio_base, irq_base;
	void __iomem *base;
	unsigned int i;
	int retval;

	retval = pcim_enable_device(pdev);
	if (retval)
		return retval;

	retval = pcim_iomap_regions(pdev, BIT(1) | BIT(0), pci_name(pdev));
	if (retval) {
		dev_err(&pdev->dev, "I/O memory mapping error\n");
		return retval;
	}

	base = pcim_iomap_table(pdev)[1];

	irq_base = readl(base);
	gpio_base = readl(sizeof(u32) + base);

	/* Release the IO mapping, since we already get the info from BAR1 */
	pcim_iounmap_regions(pdev, BIT(1));

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		dev_err(&pdev->dev, "can't allocate chip data\n");
		return -ENOMEM;
	}

	priv->dev = &pdev->dev;
	priv->reg_base = pcim_iomap_table(pdev)[0];

	priv->chip.label = dev_name(&pdev->dev);
	priv->chip.parent = &pdev->dev;
	priv->chip.request = gpiochip_generic_request;
	priv->chip.free = gpiochip_generic_free;
	priv->chip.direction_input = mrfld_gpio_direction_input;
	priv->chip.direction_output = mrfld_gpio_direction_output;
	priv->chip.get = mrfld_gpio_get;
	priv->chip.set = mrfld_gpio_set;
	priv->chip.get_direction = mrfld_gpio_get_direction;
	priv->chip.set_debounce = mrfld_gpio_set_debounce;
	priv->chip.base = gpio_base;
	priv->chip.ngpio = MRFLD_NGPIO;
	priv->chip.can_sleep = false;

	raw_spin_lock_init(&priv->lock);

	pci_set_drvdata(pdev, priv);
	retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv);
	if (retval) {
		dev_err(&pdev->dev, "gpiochip_add error %d\n", retval);
		return retval;
	}

	for (i = 0; i < ARRAY_SIZE(mrfld_gpio_ranges); i++) {
		range = &mrfld_gpio_ranges[i];
		retval = gpiochip_add_pin_range(&priv->chip,
						"pinctrl-merrifield",
						range->gpio_base,
						range->pin_base,
						range->npins);
		if (retval) {
			dev_err(&pdev->dev, "failed to add GPIO pin range\n");
			return retval;
		}
	}

	retval = gpiochip_irqchip_add(&priv->chip, &mrfld_irqchip, irq_base,
				      handle_bad_irq, IRQ_TYPE_NONE);
	if (retval) {
		dev_err(&pdev->dev, "could not connect irqchip to gpiochip\n");
		return retval;
	}

	mrfld_irq_init_hw(priv);

	gpiochip_set_chained_irqchip(&priv->chip, &mrfld_irqchip, pdev->irq,
				     mrfld_irq_handler);

	return 0;
}

static const struct pci_device_id mrfld_gpio_ids[] = {
	{ PCI_VDEVICE(INTEL, 0x1199) },
	{ }
};
MODULE_DEVICE_TABLE(pci, mrfld_gpio_ids);

static struct pci_driver mrfld_gpio_driver = {
	.name		= "gpio-merrifield",
	.id_table	= mrfld_gpio_ids,
	.probe		= mrfld_gpio_probe,
};

module_pci_driver(mrfld_gpio_driver);

MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
MODULE_DESCRIPTION("Intel Merrifield SoC GPIO driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
ccf6fd6d AS	1	/*
	2	* Intel Merrifield SoC GPIO driver
	3	*
	4	* Copyright (c) 2016 Intel Corporation.
	5	* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/bitops.h>
	13	#include <linux/gpio/driver.h>
46a5c112	14	#include <linux/gpio.h>
ccf6fd6d AS	15	#include <linux/init.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/io.h>
	18	#include <linux/module.h>
	19	#include <linux/pci.h>
	20	#include <linux/pinctrl/consumer.h>
	21
	22	#define GCCR 0x000 /* controller configuration */
	23	#define GPLR 0x004 /* pin level r/o */
	24	#define GPDR 0x01c /* pin direction */
	25	#define GPSR 0x034 /* pin set w/o */
	26	#define GPCR 0x04c /* pin clear w/o */
	27	#define GRER 0x064 /* rising edge detect */
	28	#define GFER 0x07c /* falling edge detect */
	29	#define GFBR 0x094 /* glitch filter bypass */
	30	#define GIMR 0x0ac /* interrupt mask */
	31	#define GISR 0x0c4 /* interrupt source */
	32	#define GITR 0x300 /* input type */
	33	#define GLPR 0x318 /* level input polarity */
	34	#define GWMR 0x400 /* wake mask */
	35	#define GWSR 0x418 /* wake source */
	36	#define GSIR 0xc00 /* secure input */
	37
	38	/* Intel Merrifield has 192 GPIO pins */
	39	#define MRFLD_NGPIO 192
	40
	41	struct mrfld_gpio_pinrange {
	42	unsigned int gpio_base;
	43	unsigned int pin_base;
	44	unsigned int npins;
	45	};
	46
	47	#define GPIO_PINRANGE(gstart, gend, pstart) \
	48	{ \
	49	.gpio_base = (gstart), \
	50	.pin_base = (pstart), \
	51	.npins = (gend) - (gstart) + 1, \
	52	}
	53
	54	struct mrfld_gpio {
	55	struct gpio_chip chip;
	56	void __iomem *reg_base;
	57	raw_spinlock_t lock;
	58	struct device *dev;
	59	};
	60
	61	static const struct mrfld_gpio_pinrange mrfld_gpio_ranges[] = {
	62	GPIO_PINRANGE(0, 11, 146),
	63	GPIO_PINRANGE(12, 13, 144),
	64	GPIO_PINRANGE(14, 15, 35),
	65	GPIO_PINRANGE(16, 16, 164),
	66	GPIO_PINRANGE(17, 18, 105),
	67	GPIO_PINRANGE(19, 22, 101),
	68	GPIO_PINRANGE(23, 30, 107),
	69	GPIO_PINRANGE(32, 43, 67),
	70	GPIO_PINRANGE(44, 63, 195),
	71	GPIO_PINRANGE(64, 67, 140),
	72	GPIO_PINRANGE(68, 69, 165),
	73	GPIO_PINRANGE(70, 71, 65),
	74	GPIO_PINRANGE(72, 76, 228),
	75	GPIO_PINRANGE(77, 86, 37),
	76	GPIO_PINRANGE(87, 87, 48),
	77	GPIO_PINRANGE(88, 88, 47),
	78	GPIO_PINRANGE(89, 96, 49),
79	GPIO_PINRANGE(97, 97, 34),
80	GPIO_PINRANGE(102, 119, 83),
81	GPIO_PINRANGE(120, 123, 79),
82	GPIO_PINRANGE(124, 135, 115),
83	GPIO_PINRANGE(137, 142, 158),
84	GPIO_PINRANGE(154, 163, 24),
85	GPIO_PINRANGE(164, 176, 215),
86	GPIO_PINRANGE(177, 189, 127),
87	GPIO_PINRANGE(190, 191, 178),
88	};
89
90	static void __iomem gpio_reg(struct gpio_chip chip, unsigned int offset,
91	unsigned int reg_type_offset)
92	{
93	struct mrfld_gpio *priv = gpiochip_get_data(chip);
94	u8 reg = offset / 32;
95
96	return priv->reg_base + reg_type_offset + reg * 4;
97	}
98
99	static int mrfld_gpio_get(struct gpio_chip *chip, unsigned int offset)
100	{
101	void __iomem *gplr = gpio_reg(chip, offset, GPLR);
102
103	return !!(readl(gplr) & BIT(offset % 32));
104	}
105
106	static void mrfld_gpio_set(struct gpio_chip *chip, unsigned int offset,
107	int value)
108	{
fcce9f14	109	struct mrfld_gpio *priv = gpiochip_get_data(chip);
ccf6fd6d	110	void __iomem gpsr, gpcr;
fcce9f14 AS	111	unsigned long flags;
	112
	113	raw_spin_lock_irqsave(&priv->lock, flags);
ccf6fd6d AS	114
	115	if (value) {
	116	gpsr = gpio_reg(chip, offset, GPSR);
	117	writel(BIT(offset % 32), gpsr);
	118	} else {
	119	gpcr = gpio_reg(chip, offset, GPCR);
	120	writel(BIT(offset % 32), gpcr);
	121	}
fcce9f14 AS	122
fcce9f14 AS	123	raw_spin_unlock_irqrestore(&priv->lock, flags);
ccf6fd6d AS	124	}
	125
	126	static int mrfld_gpio_direction_input(struct gpio_chip *chip,
	127	unsigned int offset)
	128	{
	129	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	130	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
	131	unsigned long flags;
	132	u32 value;
	133
	134	raw_spin_lock_irqsave(&priv->lock, flags);
	135
	136	value = readl(gpdr);
	137	value &= ~BIT(offset % 32);
	138	writel(value, gpdr);
	139
	140	raw_spin_unlock_irqrestore(&priv->lock, flags);
	141
	142	return 0;
	143	}
	144
	145	static int mrfld_gpio_direction_output(struct gpio_chip *chip,
	146	unsigned int offset, int value)
	147	{
	148	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	149	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
	150	unsigned long flags;
	151
	152	mrfld_gpio_set(chip, offset, value);
	153
	154	raw_spin_lock_irqsave(&priv->lock, flags);
	155
	156	value = readl(gpdr);
	157	value \|= BIT(offset % 32);
	158	writel(value, gpdr);
	159
	160	raw_spin_unlock_irqrestore(&priv->lock, flags);
	161
	162	return 0;
	163	}
	164
46a5c112 AS	165	static int mrfld_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
	166	{
	167	void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
	168
	169	return (readl(gpdr) & BIT(offset % 32)) ? GPIOF_DIR_OUT : GPIOF_DIR_IN;
	170	}
	171
e7a718f9 AS	172	static int mrfld_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
	173	unsigned int debounce)
	174	{
	175	struct mrfld_gpio *priv = gpiochip_get_data(chip);
	176	void __iomem *gfbr = gpio_reg(chip, offset, GFBR);
	177	unsigned long flags;
	178	u32 value;
	179
	180	raw_spin_lock_irqsave(&priv->lock, flags);
	181
	182	if (debounce)
	183	value = readl(gfbr) & ~BIT(offset % 32);
	184	else
	185	value = readl(gfbr) \| BIT(offset % 32);
	186	writel(value, gfbr);
	187
	188	raw_spin_unlock_irqrestore(&priv->lock, flags);
	189
	190	return 0;
	191	}
	192
ccf6fd6d AS	193	static void mrfld_irq_ack(struct irq_data *d)
	194	{
	195	struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
	196	u32 gpio = irqd_to_hwirq(d);
	197	void __iomem *gisr = gpio_reg(&priv->chip, gpio, GISR);
fcce9f14 AS	198	unsigned long flags;
	199
	200	raw_spin_lock_irqsave(&priv->lock, flags);
ccf6fd6d AS	201
ccf6fd6d AS	202	writel(BIT(gpio % 32), gisr);
fcce9f14 AS	203
fcce9f14 AS	204	raw_spin_unlock_irqrestore(&priv->lock, flags);
ccf6fd6d AS	205	}
	206
	207	static void mrfld_irq_unmask_mask(struct irq_data *d, bool unmask)
	208	{
	209	struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
	210	u32 gpio = irqd_to_hwirq(d);
	211	void __iomem *gimr = gpio_reg(&priv->chip, gpio, GIMR);
	212	unsigned long flags;
	213	u32 value;
	214
	215	raw_spin_lock_irqsave(&priv->lock, flags);
	216
	217	if (unmask)
	218	value = readl(gimr) \| BIT(gpio % 32);
	219	else
	220	value = readl(gimr) & ~BIT(gpio % 32);
	221	writel(value, gimr);
	222
	223	raw_spin_unlock_irqrestore(&priv->lock, flags);
	224	}
	225
	226	static void mrfld_irq_mask(struct irq_data *d)
	227	{
	228	mrfld_irq_unmask_mask(d, false);
	229	}
	230
	231	static void mrfld_irq_unmask(struct irq_data *d)
	232	{
	233	mrfld_irq_unmask_mask(d, true);
	234	}
	235
	236	static int mrfld_irq_set_type(struct irq_data *d, unsigned int type)
	237	{
	238	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	239	struct mrfld_gpio *priv = gpiochip_get_data(gc);
	240	u32 gpio = irqd_to_hwirq(d);
	241	void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER);
	242	void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER);
	243	void __iomem *gitr = gpio_reg(&priv->chip, gpio, GITR);
	244	void __iomem *glpr = gpio_reg(&priv->chip, gpio, GLPR);
	245	unsigned long flags;
	246	u32 value;
	247
	248	raw_spin_lock_irqsave(&priv->lock, flags);
	249
	250	if (type & IRQ_TYPE_EDGE_RISING)
	251	value = readl(grer) \| BIT(gpio % 32);
	252	else
	253	value = readl(grer) & ~BIT(gpio % 32);
	254	writel(value, grer);
	255
	256	if (type & IRQ_TYPE_EDGE_FALLING)
	257	value = readl(gfer) \| BIT(gpio % 32);
	258	else
	259	value = readl(gfer) & ~BIT(gpio % 32);
	260	writel(value, gfer);
	261
	262	/*
	263	* To prevent glitches from triggering an unintended level interrupt,
	264	* configure GLPR register first and then configure GITR.
	265	*/
	266	if (type & IRQ_TYPE_LEVEL_LOW)
	267	value = readl(glpr) \| BIT(gpio % 32);
	268	else
269	value = readl(glpr) & ~BIT(gpio % 32);
270	writel(value, glpr);
271
272	if (type & IRQ_TYPE_LEVEL_MASK) {
273	value = readl(gitr) \| BIT(gpio % 32);
274	writel(value, gitr);
275
276	irq_set_handler_locked(d, handle_level_irq);
277	} else if (type & IRQ_TYPE_EDGE_BOTH) {
278	value = readl(gitr) & ~BIT(gpio % 32);
279	writel(value, gitr);
280
281	irq_set_handler_locked(d, handle_edge_irq);
282	}
283
284	raw_spin_unlock_irqrestore(&priv->lock, flags);
285
286	return 0;
287	}
288
289	static int mrfld_irq_set_wake(struct irq_data *d, unsigned int on)
290	{
291	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
292	struct mrfld_gpio *priv = gpiochip_get_data(gc);
293	u32 gpio = irqd_to_hwirq(d);
294	void __iomem *gwmr = gpio_reg(&priv->chip, gpio, GWMR);
295	void __iomem *gwsr = gpio_reg(&priv->chip, gpio, GWSR);
296	unsigned long flags;
297	u32 value;
298
299	raw_spin_lock_irqsave(&priv->lock, flags);
300
301	/* Clear the existing wake status */
302	writel(BIT(gpio % 32), gwsr);
303
304	if (on)
305	value = readl(gwmr) \| BIT(gpio % 32);
306	else
307	value = readl(gwmr) & ~BIT(gpio % 32);
308	writel(value, gwmr);
309
310	raw_spin_unlock_irqrestore(&priv->lock, flags);
311
312	dev_dbg(priv->dev, "%sable wake for gpio %u\n", on ? "en" : "dis", gpio);
313	return 0;
314	}
315
316	static struct irq_chip mrfld_irqchip = {
317	.name = "gpio-merrifield",
318	.irq_ack = mrfld_irq_ack,
319	.irq_mask = mrfld_irq_mask,
320	.irq_unmask = mrfld_irq_unmask,
321	.irq_set_type = mrfld_irq_set_type,
322	.irq_set_wake = mrfld_irq_set_wake,
323	};
324
325	static void mrfld_irq_handler(struct irq_desc *desc)
326	{
327	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
328	struct mrfld_gpio *priv = gpiochip_get_data(gc);
329	struct irq_chip *irqchip = irq_desc_get_chip(desc);
330	unsigned long base, gpio;
331
332	chained_irq_enter(irqchip, desc);
333
334	/* Check GPIO controller to check which pin triggered the interrupt */
335	for (base = 0; base < priv->chip.ngpio; base += 32) {
336	void __iomem *gisr = gpio_reg(&priv->chip, base, GISR);
337	void __iomem *gimr = gpio_reg(&priv->chip, base, GIMR);
338	unsigned long pending, enabled;
339
340	pending = readl(gisr);
341	enabled = readl(gimr);
342
343	/* Only interrupts that are enabled */
344	pending &= enabled;
345
346	for_each_set_bit(gpio, &pending, 32) {
347	unsigned int irq;
348
349	irq = irq_find_mapping(gc->irqdomain, base + gpio);
350	generic_handle_irq(irq);
351	}
352	}
353
354	chained_irq_exit(irqchip, desc);
355	}
356
357	static void mrfld_irq_init_hw(struct mrfld_gpio *priv)
358	{
359	void __iomem *reg;
360	unsigned int base;
361
362	for (base = 0; base < priv->chip.ngpio; base += 32) {
363	/* Clear the rising-edge detect register */
364	reg = gpio_reg(&priv->chip, base, GRER);
365	writel(0, reg);
366	/* Clear the falling-edge detect register */
367	reg = gpio_reg(&priv->chip, base, GFER);
368	writel(0, reg);
369	}
370	}
371
372	static int mrfld_gpio_probe(struct pci_dev pdev, const struct pci_device_id id)
373	{
374	const struct mrfld_gpio_pinrange *range;
375	struct mrfld_gpio *priv;
376	u32 gpio_base, irq_base;
377	void __iomem *base;
378	unsigned int i;
379	int retval;
380
381	retval = pcim_enable_device(pdev);
382	if (retval)
383	return retval;
384
385	retval = pcim_iomap_regions(pdev, BIT(1) \| BIT(0), pci_name(pdev));
386	if (retval) {
387	dev_err(&pdev->dev, "I/O memory mapping error\n");
388	return retval;
389	}
390
391	base = pcim_iomap_table(pdev)[1];
392
393	irq_base = readl(base);
394	gpio_base = readl(sizeof(u32) + base);
395
396	/* Release the IO mapping, since we already get the info from BAR1 */
397	pcim_iounmap_regions(pdev, BIT(1));
398
399	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
400	if (!priv) {
401	dev_err(&pdev->dev, "can't allocate chip data\n");
402	return -ENOMEM;
403	}
404
405	priv->dev = &pdev->dev;
406	priv->reg_base = pcim_iomap_table(pdev)[0];
407
408	priv->chip.label = dev_name(&pdev->dev);
409	priv->chip.parent = &pdev->dev;
410	priv->chip.request = gpiochip_generic_request;
411	priv->chip.free = gpiochip_generic_free;
412	priv->chip.direction_input = mrfld_gpio_direction_input;
413	priv->chip.direction_output = mrfld_gpio_direction_output;
414	priv->chip.get = mrfld_gpio_get;
415	priv->chip.set = mrfld_gpio_set;
46a5c112	416	priv->chip.get_direction = mrfld_gpio_get_direction;
e7a718f9	417	priv->chip.set_debounce = mrfld_gpio_set_debounce;
ccf6fd6d AS	418	priv->chip.base = gpio_base;
	419	priv->chip.ngpio = MRFLD_NGPIO;
	420	priv->chip.can_sleep = false;
	421
	422	raw_spin_lock_init(&priv->lock);
	423
	424	pci_set_drvdata(pdev, priv);
	425	retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv);
	426	if (retval) {
	427	dev_err(&pdev->dev, "gpiochip_add error %d\n", retval);
	428	return retval;
	429	}
	430
	431	for (i = 0; i < ARRAY_SIZE(mrfld_gpio_ranges); i++) {
	432	range = &mrfld_gpio_ranges[i];
	433	retval = gpiochip_add_pin_range(&priv->chip,
	434	"pinctrl-merrifield",
	435	range->gpio_base,
	436	range->pin_base,
	437	range->npins);
	438	if (retval) {
	439	dev_err(&pdev->dev, "failed to add GPIO pin range\n");
	440	return retval;
	441	}
	442	}
	443
	444	retval = gpiochip_irqchip_add(&priv->chip, &mrfld_irqchip, irq_base,
e78ade0a	445	handle_bad_irq, IRQ_TYPE_NONE);
ccf6fd6d AS	446	if (retval) {
	447	dev_err(&pdev->dev, "could not connect irqchip to gpiochip\n");
	448	return retval;
	449	}
	450
	451	mrfld_irq_init_hw(priv);
	452
	453	gpiochip_set_chained_irqchip(&priv->chip, &mrfld_irqchip, pdev->irq,
	454	mrfld_irq_handler);
	455
	456	return 0;
	457	}
	458
	459	static const struct pci_device_id mrfld_gpio_ids[] = {
	460	{ PCI_VDEVICE(INTEL, 0x1199) },
	461	{ }
	462	};
	463	MODULE_DEVICE_TABLE(pci, mrfld_gpio_ids);
	464
	465	static struct pci_driver mrfld_gpio_driver = {
	466	.name = "gpio-merrifield",
	467	.id_table = mrfld_gpio_ids,
	468	.probe = mrfld_gpio_probe,
	469	};
	470
	471	module_pci_driver(mrfld_gpio_driver);
	472
	473	MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
	474	MODULE_DESCRIPTION("Intel Merrifield SoC GPIO driver");
	475	MODULE_LICENSE("GPL v2");