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

/*
 * Renesas R-Car GPIO Support
 *
 *  Copyright (C) 2014 Renesas Electronics Corporation
 *  Copyright (C) 2013 Magnus Damm
 *
 * 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; either 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.
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/spinlock.h>
#include <linux/slab.h>

struct gpio_rcar_priv {
	void __iomem *base;
	spinlock_t lock;
	struct platform_device *pdev;
	struct gpio_chip gpio_chip;
	struct irq_chip irq_chip;
	struct clk *clk;
	unsigned int irq_parent;
	bool has_both_edge_trigger;
	bool needs_clk;
};

#define IOINTSEL 0x00	/* General IO/Interrupt Switching Register */
#define INOUTSEL 0x04	/* General Input/Output Switching Register */
#define OUTDT 0x08	/* General Output Register */
#define INDT 0x0c	/* General Input Register */
#define INTDT 0x10	/* Interrupt Display Register */
#define INTCLR 0x14	/* Interrupt Clear Register */
#define INTMSK 0x18	/* Interrupt Mask Register */
#define MSKCLR 0x1c	/* Interrupt Mask Clear Register */
#define POSNEG 0x20	/* Positive/Negative Logic Select Register */
#define EDGLEVEL 0x24	/* Edge/level Select Register */
#define FILONOFF 0x28	/* Chattering Prevention On/Off Register */
#define BOTHEDGE 0x4c	/* One Edge/Both Edge Select Register */

#define RCAR_MAX_GPIO_PER_BANK		32

static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs)
{
	return ioread32(p->base + offs);
}

static inline void gpio_rcar_write(struct gpio_rcar_priv *p, int offs,
				   u32 value)
{
	iowrite32(value, p->base + offs);
}

static void gpio_rcar_modify_bit(struct gpio_rcar_priv *p, int offs,
				 int bit, bool value)
{
	u32 tmp = gpio_rcar_read(p, offs);

	if (value)
		tmp |= BIT(bit);
	else
		tmp &= ~BIT(bit);

	gpio_rcar_write(p, offs, tmp);
}

static void gpio_rcar_irq_disable(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct gpio_rcar_priv *p = container_of(gc, struct gpio_rcar_priv,
						gpio_chip);

	gpio_rcar_write(p, INTMSK, ~BIT(irqd_to_hwirq(d)));
}

static void gpio_rcar_irq_enable(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct gpio_rcar_priv *p = container_of(gc, struct gpio_rcar_priv,
						gpio_chip);

	gpio_rcar_write(p, MSKCLR, BIT(irqd_to_hwirq(d)));
}

static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p,
						  unsigned int hwirq,
						  bool active_high_rising_edge,
						  bool level_trigger,
						  bool both)
{
	unsigned long flags;

	/* follow steps in the GPIO documentation for
	 * "Setting Edge-Sensitive Interrupt Input Mode" and
	 * "Setting Level-Sensitive Interrupt Input Mode"
	 */

	spin_lock_irqsave(&p->lock, flags);

	/* Configure postive or negative logic in POSNEG */
	gpio_rcar_modify_bit(p, POSNEG, hwirq, !active_high_rising_edge);

	/* Configure edge or level trigger in EDGLEVEL */
	gpio_rcar_modify_bit(p, EDGLEVEL, hwirq, !level_trigger);

	/* Select one edge or both edges in BOTHEDGE */
	if (p->has_both_edge_trigger)
		gpio_rcar_modify_bit(p, BOTHEDGE, hwirq, both);

	/* Select "Interrupt Input Mode" in IOINTSEL */
	gpio_rcar_modify_bit(p, IOINTSEL, hwirq, true);

	/* Write INTCLR in case of edge trigger */
	if (!level_trigger)
		gpio_rcar_write(p, INTCLR, BIT(hwirq));

	spin_unlock_irqrestore(&p->lock, flags);
}

static int gpio_rcar_irq_set_type(struct irq_data *d, unsigned int type)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct gpio_rcar_priv *p = container_of(gc, struct gpio_rcar_priv,
						gpio_chip);
	unsigned int hwirq = irqd_to_hwirq(d);

	dev_dbg(&p->pdev->dev, "sense irq = %d, type = %d\n", hwirq, type);

	switch (type & IRQ_TYPE_SENSE_MASK) {
	case IRQ_TYPE_LEVEL_HIGH:
		gpio_rcar_config_interrupt_input_mode(p, hwirq, true, true,
						      false);
		break;
	case IRQ_TYPE_LEVEL_LOW:
		gpio_rcar_config_interrupt_input_mode(p, hwirq, false, true,
						      false);
		break;
	case IRQ_TYPE_EDGE_RISING:
		gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false,
						      false);
		break;
	case IRQ_TYPE_EDGE_FALLING:
		gpio_rcar_config_interrupt_input_mode(p, hwirq, false, false,
						      false);
		break;
	case IRQ_TYPE_EDGE_BOTH:
		if (!p->has_both_edge_trigger)
			return -EINVAL;
		gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false,
						      true);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int gpio_rcar_irq_set_wake(struct irq_data *d, unsigned int on)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct gpio_rcar_priv *p = container_of(gc, struct gpio_rcar_priv,
						gpio_chip);
	int error;

	if (p->irq_parent) {
		error = irq_set_irq_wake(p->irq_parent, on);
		if (error) {
			dev_dbg(&p->pdev->dev,
				"irq %u doesn't support irq_set_wake\n",
				p->irq_parent);
			p->irq_parent = 0;
		}
	}

	if (!p->clk)
		return 0;

	if (on)
		clk_enable(p->clk);
	else
		clk_disable(p->clk);

	return 0;
}

static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id)
{
	struct gpio_rcar_priv *p = dev_id;
	u32 pending;
	unsigned int offset, irqs_handled = 0;

	while ((pending = gpio_rcar_read(p, INTDT) &
			  gpio_rcar_read(p, INTMSK))) {
		offset = __ffs(pending);
		gpio_rcar_write(p, INTCLR, BIT(offset));
		generic_handle_irq(irq_find_mapping(p->gpio_chip.irqdomain,
						    offset));
		irqs_handled++;
	}

	return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
}

static inline struct gpio_rcar_priv *gpio_to_priv(struct gpio_chip *chip)
{
	return container_of(chip, struct gpio_rcar_priv, gpio_chip);
}

static void gpio_rcar_config_general_input_output_mode(struct gpio_chip *chip,
						       unsigned int gpio,
						       bool output)
{
	struct gpio_rcar_priv *p = gpio_to_priv(chip);
	unsigned long flags;

	/* follow steps in the GPIO documentation for
	 * "Setting General Output Mode" and
	 * "Setting General Input Mode"
	 */

	spin_lock_irqsave(&p->lock, flags);

	/* Configure postive logic in POSNEG */
	gpio_rcar_modify_bit(p, POSNEG, gpio, false);

	/* Select "General Input/Output Mode" in IOINTSEL */
	gpio_rcar_modify_bit(p, IOINTSEL, gpio, false);

	/* Select Input Mode or Output Mode in INOUTSEL */
	gpio_rcar_modify_bit(p, INOUTSEL, gpio, output);

	spin_unlock_irqrestore(&p->lock, flags);
}

static int gpio_rcar_request(struct gpio_chip *chip, unsigned offset)
{
	struct gpio_rcar_priv *p = gpio_to_priv(chip);
	int error;

	error = pm_runtime_get_sync(&p->pdev->dev);
	if (error < 0)
		return error;

	error = pinctrl_request_gpio(chip->base + offset);
	if (error)
		pm_runtime_put(&p->pdev->dev);

	return error;
}

static void gpio_rcar_free(struct gpio_chip *chip, unsigned offset)
{
	struct gpio_rcar_priv *p = gpio_to_priv(chip);

	pinctrl_free_gpio(chip->base + offset);

	/* Set the GPIO as an input to ensure that the next GPIO request won't
	 * drive the GPIO pin as an output.
	 */
	gpio_rcar_config_general_input_output_mode(chip, offset, false);

	pm_runtime_put(&p->pdev->dev);
}

static int gpio_rcar_direction_input(struct gpio_chip *chip, unsigned offset)
{
	gpio_rcar_config_general_input_output_mode(chip, offset, false);
	return 0;
}

static int gpio_rcar_get(struct gpio_chip *chip, unsigned offset)
{
	u32 bit = BIT(offset);

	/* testing on r8a7790 shows that INDT does not show correct pin state
	 * when configured as output, so use OUTDT in case of output pins */
	if (gpio_rcar_read(gpio_to_priv(chip), INOUTSEL) & bit)
		return !!(gpio_rcar_read(gpio_to_priv(chip), OUTDT) & bit);
	else
		return !!(gpio_rcar_read(gpio_to_priv(chip), INDT) & bit);
}

static void gpio_rcar_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct gpio_rcar_priv *p = gpio_to_priv(chip);
	unsigned long flags;

	spin_lock_irqsave(&p->lock, flags);
	gpio_rcar_modify_bit(p, OUTDT, offset, value);
	spin_unlock_irqrestore(&p->lock, flags);
}

static int gpio_rcar_direction_output(struct gpio_chip *chip, unsigned offset,
				      int value)
{
	/* write GPIO value to output before selecting output mode of pin */
	gpio_rcar_set(chip, offset, value);
	gpio_rcar_config_general_input_output_mode(chip, offset, true);
	return 0;
}

struct gpio_rcar_info {
	bool has_both_edge_trigger;
	bool needs_clk;
};

static const struct gpio_rcar_info gpio_rcar_info_gen1 = {
	.has_both_edge_trigger = false,
	.needs_clk = false,
};

static const struct gpio_rcar_info gpio_rcar_info_gen2 = {
	.has_both_edge_trigger = true,
	.needs_clk = true,
};

static const struct of_device_id gpio_rcar_of_table[] = {
	{
		.compatible = "renesas,gpio-r8a7790",
		.data = &gpio_rcar_info_gen2,
	}, {
		.compatible = "renesas,gpio-r8a7791",
		.data = &gpio_rcar_info_gen2,
	}, {
		.compatible = "renesas,gpio-r8a7793",
		.data = &gpio_rcar_info_gen2,
	}, {
		.compatible = "renesas,gpio-r8a7794",
		.data = &gpio_rcar_info_gen2,
	}, {
		.compatible = "renesas,gpio-r8a7795",
		/* Gen3 GPIO is identical to Gen2. */
		.data = &gpio_rcar_info_gen2,
	}, {
		.compatible = "renesas,gpio-rcar",
		.data = &gpio_rcar_info_gen1,
	}, {
		/* Terminator */
	},
};

MODULE_DEVICE_TABLE(of, gpio_rcar_of_table);

static int gpio_rcar_parse_dt(struct gpio_rcar_priv *p, unsigned int *npins)
{
	struct device_node *np = p->pdev->dev.of_node;
	const struct of_device_id *match;
	const struct gpio_rcar_info *info;
	struct of_phandle_args args;
	int ret;

	match = of_match_node(gpio_rcar_of_table, np);
	if (!match)
		return -EINVAL;

	info = match->data;

	ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &args);
	*npins = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK;
	p->has_both_edge_trigger = info->has_both_edge_trigger;
	p->needs_clk = info->needs_clk;

	if (*npins == 0 || *npins > RCAR_MAX_GPIO_PER_BANK) {
		dev_warn(&p->pdev->dev,
			 "Invalid number of gpio lines %u, using %u\n", *npins,
			 RCAR_MAX_GPIO_PER_BANK);
		*npins = RCAR_MAX_GPIO_PER_BANK;
	}

	return 0;
}

static int gpio_rcar_probe(struct platform_device *pdev)
{
	struct gpio_rcar_priv *p;
	struct resource *io, *irq;
	struct gpio_chip *gpio_chip;
	struct irq_chip *irq_chip;
	struct device *dev = &pdev->dev;
	const char *name = dev_name(dev);
	unsigned int npins;
	int ret;

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

	p->pdev = pdev;
	spin_lock_init(&p->lock);

	/* Get device configuration from DT node */
	ret = gpio_rcar_parse_dt(p, &npins);
	if (ret < 0)
		return ret;

	platform_set_drvdata(pdev, p);

	p->clk = devm_clk_get(dev, NULL);
	if (IS_ERR(p->clk)) {
		if (p->needs_clk) {
			dev_err(dev, "unable to get clock\n");
			ret = PTR_ERR(p->clk);
			goto err0;
		}
		p->clk = NULL;
	}

	pm_runtime_enable(dev);

	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

	if (!io || !irq) {
		dev_err(dev, "missing IRQ or IOMEM\n");
		ret = -EINVAL;
		goto err0;
	}

	p->base = devm_ioremap_nocache(dev, io->start, resource_size(io));
	if (!p->base) {
		dev_err(dev, "failed to remap I/O memory\n");
		ret = -ENXIO;
		goto err0;
	}

	gpio_chip = &p->gpio_chip;
	gpio_chip->request = gpio_rcar_request;
	gpio_chip->free = gpio_rcar_free;
	gpio_chip->direction_input = gpio_rcar_direction_input;
	gpio_chip->get = gpio_rcar_get;
	gpio_chip->direction_output = gpio_rcar_direction_output;
	gpio_chip->set = gpio_rcar_set;
	gpio_chip->label = name;
	gpio_chip->parent = dev;
	gpio_chip->owner = THIS_MODULE;
	gpio_chip->base = -1;
	gpio_chip->ngpio = npins;

	irq_chip = &p->irq_chip;
	irq_chip->name = name;
	irq_chip->irq_mask = gpio_rcar_irq_disable;
	irq_chip->irq_unmask = gpio_rcar_irq_enable;
	irq_chip->irq_set_type = gpio_rcar_irq_set_type;
	irq_chip->irq_set_wake = gpio_rcar_irq_set_wake;
	irq_chip->flags	= IRQCHIP_SET_TYPE_MASKED | IRQCHIP_MASK_ON_SUSPEND;

	ret = gpiochip_add(gpio_chip);
	if (ret) {
		dev_err(dev, "failed to add GPIO controller\n");
		goto err0;
	}

	ret = gpiochip_irqchip_add(gpio_chip, irq_chip, 0, handle_level_irq,
				   IRQ_TYPE_NONE);
	if (ret) {
		dev_err(dev, "cannot add irqchip\n");
		goto err1;
	}

	p->irq_parent = irq->start;
	if (devm_request_irq(dev, irq->start, gpio_rcar_irq_handler,
			     IRQF_SHARED, name, p)) {
		dev_err(dev, "failed to request IRQ\n");
		ret = -ENOENT;
		goto err1;
	}

	dev_info(dev, "driving %d GPIOs\n", npins);

	return 0;

err1:
	gpiochip_remove(gpio_chip);
err0:
	pm_runtime_disable(dev);
	return ret;
}

static int gpio_rcar_remove(struct platform_device *pdev)
{
	struct gpio_rcar_priv *p = platform_get_drvdata(pdev);

	gpiochip_remove(&p->gpio_chip);

	pm_runtime_disable(&pdev->dev);
	return 0;
}

static struct platform_driver gpio_rcar_device_driver = {
	.probe		= gpio_rcar_probe,
	.remove		= gpio_rcar_remove,
	.driver		= {
		.name	= "gpio_rcar",
		.of_match_table = of_match_ptr(gpio_rcar_of_table),
	}
};

module_platform_driver(gpio_rcar_device_driver);

MODULE_AUTHOR("Magnus Damm");
MODULE_DESCRIPTION("Renesas R-Car GPIO Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
119f5e44 MD	1	/*
	2	* Renesas R-Car GPIO Support
	3	*
1fd2b49d	4	* Copyright (C) 2014 Renesas Electronics Corporation
119f5e44 MD	5	* Copyright (C) 2013 Magnus Damm
	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 as published by
	9	* the Free Software Foundation; either version 2 of the License
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*/
	16
ab82fa7d	17	#include <linux/clk.h>
119f5e44 MD	18	#include <linux/err.h>
	19	#include <linux/gpio.h>
	20	#include <linux/init.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/io.h>
	23	#include <linux/ioport.h>
	24	#include <linux/irq.h>
119f5e44	25	#include <linux/module.h>
bd0bf468	26	#include <linux/of.h>
dc3465a9	27	#include <linux/pinctrl/consumer.h>
119f5e44	28	#include <linux/platform_device.h>
df0c6c80	29	#include <linux/pm_runtime.h>
119f5e44 MD	30	#include <linux/spinlock.h>
	31	#include <linux/slab.h>
	32
	33	struct gpio_rcar_priv {
	34	void __iomem *base;
	35	spinlock_t lock;
119f5e44 MD	36	struct platform_device *pdev;
	37	struct gpio_chip gpio_chip;
	38	struct irq_chip irq_chip;
ab82fa7d	39	struct clk *clk;
8b092be9 GU	40	unsigned int irq_parent;
8b092be9 GU	41	bool has_both_edge_trigger;
e1fef9e2	42	bool needs_clk;
119f5e44 MD	43	};
119f5e44 MD	44
3dc1e685 GU	45	#define IOINTSEL 0x00 /* General IO/Interrupt Switching Register */
	46	#define INOUTSEL 0x04 /* General Input/Output Switching Register */
	47	#define OUTDT 0x08 /* General Output Register */
	48	#define INDT 0x0c /* General Input Register */
	49	#define INTDT 0x10 /* Interrupt Display Register */
	50	#define INTCLR 0x14 /* Interrupt Clear Register */
	51	#define INTMSK 0x18 /* Interrupt Mask Register */
	52	#define MSKCLR 0x1c /* Interrupt Mask Clear Register */
	53	#define POSNEG 0x20 /* Positive/Negative Logic Select Register */
	54	#define EDGLEVEL 0x24 /* Edge/level Select Register */
	55	#define FILONOFF 0x28 /* Chattering Prevention On/Off Register */
	56	#define BOTHEDGE 0x4c /* One Edge/Both Edge Select Register */
119f5e44	57
159f8a02 LP	58	#define RCAR_MAX_GPIO_PER_BANK 32
159f8a02 LP	59
119f5e44 MD	60	static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs)
	61	{
	62	return ioread32(p->base + offs);
	63	}
	64
	65	static inline void gpio_rcar_write(struct gpio_rcar_priv *p, int offs,
	66	u32 value)
	67	{
	68	iowrite32(value, p->base + offs);
	69	}
	70
	71	static void gpio_rcar_modify_bit(struct gpio_rcar_priv *p, int offs,
	72	int bit, bool value)
	73	{
	74	u32 tmp = gpio_rcar_read(p, offs);
	75
	76	if (value)
	77	tmp \|= BIT(bit);
	78	else
	79	tmp &= ~BIT(bit);
	80
	81	gpio_rcar_write(p, offs, tmp);
	82	}
	83
	84	static void gpio_rcar_irq_disable(struct irq_data *d)
	85	{
c7f3c5d3 GU	86	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	87	struct gpio_rcar_priv *p = container_of(gc, struct gpio_rcar_priv,
	88	gpio_chip);
119f5e44 MD	89
	90	gpio_rcar_write(p, INTMSK, ~BIT(irqd_to_hwirq(d)));
	91	}
	92
	93	static void gpio_rcar_irq_enable(struct irq_data *d)
	94	{
c7f3c5d3 GU	95	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	96	struct gpio_rcar_priv *p = container_of(gc, struct gpio_rcar_priv,
	97	gpio_chip);
119f5e44 MD	98
	99	gpio_rcar_write(p, MSKCLR, BIT(irqd_to_hwirq(d)));
	100	}
	101
	102	static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p,
	103	unsigned int hwirq,
	104	bool active_high_rising_edge,
7e1092b5 SH	105	bool level_trigger,
7e1092b5 SH	106	bool both)
119f5e44 MD	107	{
	108	unsigned long flags;
	109
	110	/* follow steps in the GPIO documentation for
	111	* "Setting Edge-Sensitive Interrupt Input Mode" and
	112	* "Setting Level-Sensitive Interrupt Input Mode"
	113	*/
	114
	115	spin_lock_irqsave(&p->lock, flags);
	116
	117	/* Configure postive or negative logic in POSNEG */
	118	gpio_rcar_modify_bit(p, POSNEG, hwirq, !active_high_rising_edge);
	119
	120	/* Configure edge or level trigger in EDGLEVEL */
	121	gpio_rcar_modify_bit(p, EDGLEVEL, hwirq, !level_trigger);
	122
7e1092b5	123	/* Select one edge or both edges in BOTHEDGE */
8b092be9	124	if (p->has_both_edge_trigger)
7e1092b5 SH	125	gpio_rcar_modify_bit(p, BOTHEDGE, hwirq, both);
7e1092b5 SH	126
119f5e44 MD	127	/* Select "Interrupt Input Mode" in IOINTSEL */
	128	gpio_rcar_modify_bit(p, IOINTSEL, hwirq, true);
	129
	130	/* Write INTCLR in case of edge trigger */
	131	if (!level_trigger)
	132	gpio_rcar_write(p, INTCLR, BIT(hwirq));
	133
	134	spin_unlock_irqrestore(&p->lock, flags);
	135	}
	136
	137	static int gpio_rcar_irq_set_type(struct irq_data *d, unsigned int type)
	138	{
c7f3c5d3 GU	139	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	140	struct gpio_rcar_priv *p = container_of(gc, struct gpio_rcar_priv,
	141	gpio_chip);
119f5e44 MD	142	unsigned int hwirq = irqd_to_hwirq(d);
	143
	144	dev_dbg(&p->pdev->dev, "sense irq = %d, type = %d\n", hwirq, type);
	145
	146	switch (type & IRQ_TYPE_SENSE_MASK) {
	147	case IRQ_TYPE_LEVEL_HIGH:
7e1092b5 SH	148	gpio_rcar_config_interrupt_input_mode(p, hwirq, true, true,
7e1092b5 SH	149	false);
119f5e44 MD	150	break;
119f5e44 MD	151	case IRQ_TYPE_LEVEL_LOW:
7e1092b5 SH	152	gpio_rcar_config_interrupt_input_mode(p, hwirq, false, true,
7e1092b5 SH	153	false);
119f5e44 MD	154	break;
119f5e44 MD	155	case IRQ_TYPE_EDGE_RISING:
7e1092b5 SH	156	gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false,
7e1092b5 SH	157	false);
119f5e44 MD	158	break;
119f5e44 MD	159	case IRQ_TYPE_EDGE_FALLING:
7e1092b5 SH	160	gpio_rcar_config_interrupt_input_mode(p, hwirq, false, false,
	161	false);
	162	break;
	163	case IRQ_TYPE_EDGE_BOTH:
8b092be9	164	if (!p->has_both_edge_trigger)
7e1092b5 SH	165	return -EINVAL;
	166	gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false,
	167	true);
119f5e44 MD	168	break;
	169	default:
	170	return -EINVAL;
	171	}
	172	return 0;
	173	}
	174
ab82fa7d GU	175	static int gpio_rcar_irq_set_wake(struct irq_data *d, unsigned int on)
	176	{
	177	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	178	struct gpio_rcar_priv *p = container_of(gc, struct gpio_rcar_priv,
	179	gpio_chip);
501ef0f9 GU	180	int error;
	181
	182	if (p->irq_parent) {
	183	error = irq_set_irq_wake(p->irq_parent, on);
	184	if (error) {
	185	dev_dbg(&p->pdev->dev,
	186	"irq %u doesn't support irq_set_wake\n",
	187	p->irq_parent);
	188	p->irq_parent = 0;
	189	}
	190	}
ab82fa7d GU	191
	192	if (!p->clk)
	193	return 0;
	194
	195	if (on)
	196	clk_enable(p->clk);
	197	else
	198	clk_disable(p->clk);
	199
	200	return 0;
	201	}
	202
119f5e44 MD	203	static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id)
	204	{
	205	struct gpio_rcar_priv *p = dev_id;
	206	u32 pending;
	207	unsigned int offset, irqs_handled = 0;
	208
8808b64d VB	209	while ((pending = gpio_rcar_read(p, INTDT) &
8808b64d VB	210	gpio_rcar_read(p, INTMSK))) {
119f5e44 MD	211	offset = __ffs(pending);
119f5e44 MD	212	gpio_rcar_write(p, INTCLR, BIT(offset));
c7f3c5d3 GU	213	generic_handle_irq(irq_find_mapping(p->gpio_chip.irqdomain,
c7f3c5d3 GU	214	offset));
119f5e44 MD	215	irqs_handled++;
	216	}
	217
	218	return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
	219	}
	220
	221	static inline struct gpio_rcar_priv gpio_to_priv(struct gpio_chip chip)
	222	{
	223	return container_of(chip, struct gpio_rcar_priv, gpio_chip);
	224	}
	225
	226	static void gpio_rcar_config_general_input_output_mode(struct gpio_chip *chip,
	227	unsigned int gpio,
	228	bool output)
	229	{
	230	struct gpio_rcar_priv *p = gpio_to_priv(chip);
	231	unsigned long flags;
	232
	233	/* follow steps in the GPIO documentation for
	234	* "Setting General Output Mode" and
	235	* "Setting General Input Mode"
	236	*/
	237
	238	spin_lock_irqsave(&p->lock, flags);
	239
	240	/* Configure postive logic in POSNEG */
	241	gpio_rcar_modify_bit(p, POSNEG, gpio, false);
	242
	243	/* Select "General Input/Output Mode" in IOINTSEL */
	244	gpio_rcar_modify_bit(p, IOINTSEL, gpio, false);
	245
	246	/* Select Input Mode or Output Mode in INOUTSEL */
	247	gpio_rcar_modify_bit(p, INOUTSEL, gpio, output);
	248
	249	spin_unlock_irqrestore(&p->lock, flags);
	250	}
	251
dc3465a9 LP	252	static int gpio_rcar_request(struct gpio_chip *chip, unsigned offset)
dc3465a9 LP	253	{
65194cb1 GU	254	struct gpio_rcar_priv *p = gpio_to_priv(chip);
	255	int error;
	256
	257	error = pm_runtime_get_sync(&p->pdev->dev);
	258	if (error < 0)
	259	return error;
	260
	261	error = pinctrl_request_gpio(chip->base + offset);
	262	if (error)
	263	pm_runtime_put(&p->pdev->dev);
	264
	265	return error;
dc3465a9 LP	266	}
	267
	268	static void gpio_rcar_free(struct gpio_chip *chip, unsigned offset)
	269	{
65194cb1 GU	270	struct gpio_rcar_priv *p = gpio_to_priv(chip);
65194cb1 GU	271
dc3465a9 LP	272	pinctrl_free_gpio(chip->base + offset);
	273
	274	/* Set the GPIO as an input to ensure that the next GPIO request won't
	275	* drive the GPIO pin as an output.
	276	*/
	277	gpio_rcar_config_general_input_output_mode(chip, offset, false);
65194cb1 GU	278
65194cb1 GU	279	pm_runtime_put(&p->pdev->dev);
dc3465a9 LP	280	}
dc3465a9 LP	281
119f5e44 MD	282	static int gpio_rcar_direction_input(struct gpio_chip *chip, unsigned offset)
	283	{
	284	gpio_rcar_config_general_input_output_mode(chip, offset, false);
	285	return 0;
	286	}
	287
	288	static int gpio_rcar_get(struct gpio_chip *chip, unsigned offset)
	289	{
ae9550f6 MD	290	u32 bit = BIT(offset);
	291
	292	/* testing on r8a7790 shows that INDT does not show correct pin state
	293	* when configured as output, so use OUTDT in case of output pins */
	294	if (gpio_rcar_read(gpio_to_priv(chip), INOUTSEL) & bit)
7cb5409b	295	return !!(gpio_rcar_read(gpio_to_priv(chip), OUTDT) & bit);
ae9550f6	296	else
7cb5409b	297	return !!(gpio_rcar_read(gpio_to_priv(chip), INDT) & bit);
119f5e44 MD	298	}
	299
	300	static void gpio_rcar_set(struct gpio_chip *chip, unsigned offset, int value)
	301	{
	302	struct gpio_rcar_priv *p = gpio_to_priv(chip);
	303	unsigned long flags;
	304
	305	spin_lock_irqsave(&p->lock, flags);
	306	gpio_rcar_modify_bit(p, OUTDT, offset, value);
	307	spin_unlock_irqrestore(&p->lock, flags);
	308	}
	309
	310	static int gpio_rcar_direction_output(struct gpio_chip *chip, unsigned offset,
	311	int value)
	312	{
	313	/* write GPIO value to output before selecting output mode of pin */
	314	gpio_rcar_set(chip, offset, value);
	315	gpio_rcar_config_general_input_output_mode(chip, offset, true);
	316	return 0;
	317	}
	318
850dfe17 LP	319	struct gpio_rcar_info {
850dfe17 LP	320	bool has_both_edge_trigger;
e1fef9e2	321	bool needs_clk;
850dfe17 LP	322	};
850dfe17 LP	323
1fd2b49d HN	324	static const struct gpio_rcar_info gpio_rcar_info_gen1 = {
1fd2b49d HN	325	.has_both_edge_trigger = false,
e1fef9e2	326	.needs_clk = false,
1fd2b49d HN	327	};
	328
	329	static const struct gpio_rcar_info gpio_rcar_info_gen2 = {
	330	.has_both_edge_trigger = true,
e1fef9e2	331	.needs_clk = true,
1fd2b49d HN	332	};
1fd2b49d HN	333
850dfe17 LP	334	static const struct of_device_id gpio_rcar_of_table[] = {
	335	{
	336	.compatible = "renesas,gpio-r8a7790",
1fd2b49d	337	.data = &gpio_rcar_info_gen2,
850dfe17 LP	338	}, {
850dfe17 LP	339	.compatible = "renesas,gpio-r8a7791",
1fd2b49d HN	340	.data = &gpio_rcar_info_gen2,
	341	}, {
	342	.compatible = "renesas,gpio-r8a7793",
	343	.data = &gpio_rcar_info_gen2,
	344	}, {
	345	.compatible = "renesas,gpio-r8a7794",
	346	.data = &gpio_rcar_info_gen2,
8cd14702 UH	347	}, {
	348	.compatible = "renesas,gpio-r8a7795",
	349	/* Gen3 GPIO is identical to Gen2. */
	350	.data = &gpio_rcar_info_gen2,
850dfe17 LP	351	}, {
850dfe17 LP	352	.compatible = "renesas,gpio-rcar",
1fd2b49d	353	.data = &gpio_rcar_info_gen1,
850dfe17 LP	354	}, {
	355	/* Terminator */
	356	},
	357	};
	358
	359	MODULE_DEVICE_TABLE(of, gpio_rcar_of_table);
	360
8b092be9	361	static int gpio_rcar_parse_dt(struct gpio_rcar_priv p, unsigned int npins)
159f8a02	362	{
159f8a02	363	struct device_node *np = p->pdev->dev.of_node;
8b092be9 GU	364	const struct of_device_id *match;
8b092be9 GU	365	const struct gpio_rcar_info *info;
159f8a02 LP	366	struct of_phandle_args args;
159f8a02 LP	367	int ret;
159f8a02	368
8b092be9 GU	369	match = of_match_node(gpio_rcar_of_table, np);
	370	if (!match)
	371	return -EINVAL;
850dfe17	372
8b092be9	373	info = match->data;
850dfe17	374
8b092be9 GU	375	ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &args);
	376	*npins = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK;
	377	p->has_both_edge_trigger = info->has_both_edge_trigger;
e1fef9e2	378	p->needs_clk = info->needs_clk;
850dfe17	379
8b092be9	380	if (npins == 0 \|\| npins > RCAR_MAX_GPIO_PER_BANK) {
159f8a02	381	dev_warn(&p->pdev->dev,
8b092be9 GU	382	"Invalid number of gpio lines %u, using %u\n", *npins,
	383	RCAR_MAX_GPIO_PER_BANK);
	384	*npins = RCAR_MAX_GPIO_PER_BANK;
159f8a02	385	}
850dfe17 LP	386
850dfe17 LP	387	return 0;
159f8a02 LP	388	}
159f8a02 LP	389
119f5e44 MD	390	static int gpio_rcar_probe(struct platform_device *pdev)
119f5e44 MD	391	{
119f5e44 MD	392	struct gpio_rcar_priv *p;
	393	struct resource io, irq;
	394	struct gpio_chip *gpio_chip;
	395	struct irq_chip *irq_chip;
b22978fc GU	396	struct device *dev = &pdev->dev;
b22978fc GU	397	const char *name = dev_name(dev);
8b092be9	398	unsigned int npins;
119f5e44 MD	399	int ret;
119f5e44 MD	400
b22978fc	401	p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL);
7d82bf34 GU	402	if (!p)
7d82bf34 GU	403	return -ENOMEM;
119f5e44	404
119f5e44	405	p->pdev = pdev;
119f5e44 MD	406	spin_lock_init(&p->lock);
119f5e44 MD	407
8b092be9 GU	408	/* Get device configuration from DT node */
8b092be9 GU	409	ret = gpio_rcar_parse_dt(p, &npins);
850dfe17 LP	410	if (ret < 0)
850dfe17 LP	411	return ret;
159f8a02 LP	412
	413	platform_set_drvdata(pdev, p);
	414
ab82fa7d GU	415	p->clk = devm_clk_get(dev, NULL);
ab82fa7d GU	416	if (IS_ERR(p->clk)) {
e1fef9e2 GU	417	if (p->needs_clk) {
	418	dev_err(dev, "unable to get clock\n");
	419	ret = PTR_ERR(p->clk);
	420	goto err0;
	421	}
ab82fa7d GU	422	p->clk = NULL;
	423	}
	424
df0c6c80	425	pm_runtime_enable(dev);
df0c6c80	426
119f5e44 MD	427	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	428	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	429
	430	if (!io \|\| !irq) {
b22978fc	431	dev_err(dev, "missing IRQ or IOMEM\n");
119f5e44 MD	432	ret = -EINVAL;
	433	goto err0;
	434	}
	435
b22978fc	436	p->base = devm_ioremap_nocache(dev, io->start, resource_size(io));
119f5e44	437	if (!p->base) {
b22978fc	438	dev_err(dev, "failed to remap I/O memory\n");
119f5e44 MD	439	ret = -ENXIO;
	440	goto err0;
	441	}
	442
	443	gpio_chip = &p->gpio_chip;
dc3465a9 LP	444	gpio_chip->request = gpio_rcar_request;
dc3465a9 LP	445	gpio_chip->free = gpio_rcar_free;
119f5e44 MD	446	gpio_chip->direction_input = gpio_rcar_direction_input;
	447	gpio_chip->get = gpio_rcar_get;
	448	gpio_chip->direction_output = gpio_rcar_direction_output;
	449	gpio_chip->set = gpio_rcar_set;
119f5e44	450	gpio_chip->label = name;
58383c78	451	gpio_chip->parent = dev;
119f5e44	452	gpio_chip->owner = THIS_MODULE;
8b092be9 GU	453	gpio_chip->base = -1;
8b092be9 GU	454	gpio_chip->ngpio = npins;
119f5e44 MD	455
	456	irq_chip = &p->irq_chip;
	457	irq_chip->name = name;
	458	irq_chip->irq_mask = gpio_rcar_irq_disable;
	459	irq_chip->irq_unmask = gpio_rcar_irq_enable;
119f5e44	460	irq_chip->irq_set_type = gpio_rcar_irq_set_type;
ab82fa7d GU	461	irq_chip->irq_set_wake = gpio_rcar_irq_set_wake;
ab82fa7d GU	462	irq_chip->flags = IRQCHIP_SET_TYPE_MASKED \| IRQCHIP_MASK_ON_SUSPEND;
119f5e44	463
c7f3c5d3 GU	464	ret = gpiochip_add(gpio_chip);
	465	if (ret) {
	466	dev_err(dev, "failed to add GPIO controller\n");
0c8aab8e	467	goto err0;
119f5e44 MD	468	}
119f5e44 MD	469
8b092be9 GU	470	ret = gpiochip_irqchip_add(gpio_chip, irq_chip, 0, handle_level_irq,
8b092be9 GU	471	IRQ_TYPE_NONE);
c7f3c5d3 GU	472	if (ret) {
	473	dev_err(dev, "cannot add irqchip\n");
	474	goto err1;
	475	}
	476
ab82fa7d	477	p->irq_parent = irq->start;
b22978fc GU	478	if (devm_request_irq(dev, irq->start, gpio_rcar_irq_handler,
	479	IRQF_SHARED, name, p)) {
	480	dev_err(dev, "failed to request IRQ\n");
119f5e44 MD	481	ret = -ENOENT;
	482	goto err1;
	483	}
	484
8b092be9	485	dev_info(dev, "driving %d GPIOs\n", npins);
dc3465a9	486
119f5e44 MD	487	return 0;
	488
	489	err1:
4d84b9e4	490	gpiochip_remove(gpio_chip);
119f5e44	491	err0:
df0c6c80	492	pm_runtime_disable(dev);
119f5e44 MD	493	return ret;
	494	}
	495
	496	static int gpio_rcar_remove(struct platform_device *pdev)
	497	{
	498	struct gpio_rcar_priv *p = platform_get_drvdata(pdev);
119f5e44	499
9f5132ae	500	gpiochip_remove(&p->gpio_chip);
119f5e44	501
df0c6c80	502	pm_runtime_disable(&pdev->dev);
119f5e44 MD	503	return 0;
	504	}
	505
	506	static struct platform_driver gpio_rcar_device_driver = {
	507	.probe = gpio_rcar_probe,
	508	.remove = gpio_rcar_remove,
	509	.driver = {
	510	.name = "gpio_rcar",
159f8a02	511	.of_match_table = of_match_ptr(gpio_rcar_of_table),
119f5e44 MD	512	}
	513	};
	514
	515	module_platform_driver(gpio_rcar_device_driver);
	516
	517	MODULE_AUTHOR("Magnus Damm");
	518	MODULE_DESCRIPTION("Renesas R-Car GPIO Driver");
	519	MODULE_LICENSE("GPL v2");