[linux-2.6-block.git] / drivers / gpio / gpio-tqmx86.c

// SPDX-License-Identifier: GPL-2.0
/*
 * TQ-Systems TQMx86 PLD GPIO driver
 *
 * Based on vendor driver by:
 *   Vadim V.Vlasov <vvlasov@dev.rtsoft.ru>
 */

#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/seq_file.h>
#include <linux/slab.h>

#define TQMX86_NGPIO	8
#define TQMX86_NGPO	4	/* 0-3 - output */
#define TQMX86_NGPI	4	/* 4-7 - input */
#define TQMX86_DIR_INPUT_MASK	0xf0	/* 0-3 - output, 4-7 - input */

#define TQMX86_GPIODD	0	/* GPIO Data Direction Register */
#define TQMX86_GPIOD	1	/* GPIO Data Register */
#define TQMX86_GPIIC	3	/* GPI Interrupt Configuration Register */
#define TQMX86_GPIIS	4	/* GPI Interrupt Status Register */

#define TQMX86_GPII_FALLING	BIT(0)
#define TQMX86_GPII_RISING	BIT(1)
#define TQMX86_GPII_MASK	(BIT(0) | BIT(1))
#define TQMX86_GPII_BITS	2

struct tqmx86_gpio_data {
	struct gpio_chip	chip;
	void __iomem		*io_base;
	int			irq;
	raw_spinlock_t		spinlock;
	u8			irq_type[TQMX86_NGPI];
};

static u8 tqmx86_gpio_read(struct tqmx86_gpio_data *gd, unsigned int reg)
{
	return ioread8(gd->io_base + reg);
}

static void tqmx86_gpio_write(struct tqmx86_gpio_data *gd, u8 val,
			      unsigned int reg)
{
	iowrite8(val, gd->io_base + reg);
}

static int tqmx86_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	struct tqmx86_gpio_data *gpio = gpiochip_get_data(chip);

	return !!(tqmx86_gpio_read(gpio, TQMX86_GPIOD) & BIT(offset));
}

static void tqmx86_gpio_set(struct gpio_chip *chip, unsigned int offset,
			    int value)
{
	struct tqmx86_gpio_data *gpio = gpiochip_get_data(chip);
	unsigned long flags;
	u8 val;

	raw_spin_lock_irqsave(&gpio->spinlock, flags);
	val = tqmx86_gpio_read(gpio, TQMX86_GPIOD);
	if (value)
		val |= BIT(offset);
	else
		val &= ~BIT(offset);
	tqmx86_gpio_write(gpio, val, TQMX86_GPIOD);
	raw_spin_unlock_irqrestore(&gpio->spinlock, flags);
}

static int tqmx86_gpio_direction_input(struct gpio_chip *chip,
				       unsigned int offset)
{
	/* Direction cannot be changed. Validate is an input. */
	if (BIT(offset) & TQMX86_DIR_INPUT_MASK)
		return 0;
	else
		return -EINVAL;
}

static int tqmx86_gpio_direction_output(struct gpio_chip *chip,
					unsigned int offset,
					int value)
{
	/* Direction cannot be changed, validate is an output */
	if (BIT(offset) & TQMX86_DIR_INPUT_MASK)
		return -EINVAL;

	tqmx86_gpio_set(chip, offset, value);
	return 0;
}

static int tqmx86_gpio_get_direction(struct gpio_chip *chip,
				     unsigned int offset)
{
	if (TQMX86_DIR_INPUT_MASK & BIT(offset))
		return GPIO_LINE_DIRECTION_IN;

	return GPIO_LINE_DIRECTION_OUT;
}

static void tqmx86_gpio_irq_mask(struct irq_data *data)
{
	unsigned int offset = (data->hwirq - TQMX86_NGPO);
	struct tqmx86_gpio_data *gpio = gpiochip_get_data(
		irq_data_get_irq_chip_data(data));
	unsigned long flags;
	u8 gpiic, mask;

	mask = TQMX86_GPII_MASK << (offset * TQMX86_GPII_BITS);

	raw_spin_lock_irqsave(&gpio->spinlock, flags);
	gpiic = tqmx86_gpio_read(gpio, TQMX86_GPIIC);
	gpiic &= ~mask;
	tqmx86_gpio_write(gpio, gpiic, TQMX86_GPIIC);
	raw_spin_unlock_irqrestore(&gpio->spinlock, flags);
	gpiochip_disable_irq(&gpio->chip, irqd_to_hwirq(data));
}

static void tqmx86_gpio_irq_unmask(struct irq_data *data)
{
	unsigned int offset = (data->hwirq - TQMX86_NGPO);
	struct tqmx86_gpio_data *gpio = gpiochip_get_data(
		irq_data_get_irq_chip_data(data));
	unsigned long flags;
	u8 gpiic, mask;

	mask = TQMX86_GPII_MASK << (offset * TQMX86_GPII_BITS);

	gpiochip_enable_irq(&gpio->chip, irqd_to_hwirq(data));
	raw_spin_lock_irqsave(&gpio->spinlock, flags);
	gpiic = tqmx86_gpio_read(gpio, TQMX86_GPIIC);
	gpiic &= ~mask;
	gpiic |= gpio->irq_type[offset] << (offset * TQMX86_GPII_BITS);
	tqmx86_gpio_write(gpio, gpiic, TQMX86_GPIIC);
	raw_spin_unlock_irqrestore(&gpio->spinlock, flags);
}

static int tqmx86_gpio_irq_set_type(struct irq_data *data, unsigned int type)
{
	struct tqmx86_gpio_data *gpio = gpiochip_get_data(
		irq_data_get_irq_chip_data(data));
	unsigned int offset = (data->hwirq - TQMX86_NGPO);
	unsigned int edge_type = type & IRQF_TRIGGER_MASK;
	unsigned long flags;
	u8 new_type, gpiic;

	switch (edge_type) {
	case IRQ_TYPE_EDGE_RISING:
		new_type = TQMX86_GPII_RISING;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		new_type = TQMX86_GPII_FALLING;
		break;
	case IRQ_TYPE_EDGE_BOTH:
		new_type = TQMX86_GPII_FALLING | TQMX86_GPII_RISING;
		break;
	default:
		return -EINVAL; /* not supported */
	}

	gpio->irq_type[offset] = new_type;

	raw_spin_lock_irqsave(&gpio->spinlock, flags);
	gpiic = tqmx86_gpio_read(gpio, TQMX86_GPIIC);
	gpiic &= ~((TQMX86_GPII_MASK) << (offset * TQMX86_GPII_BITS));
	gpiic |= new_type << (offset * TQMX86_GPII_BITS);
	tqmx86_gpio_write(gpio, gpiic, TQMX86_GPIIC);
	raw_spin_unlock_irqrestore(&gpio->spinlock, flags);

	return 0;
}

static void tqmx86_gpio_irq_handler(struct irq_desc *desc)
{
	struct gpio_chip *chip = irq_desc_get_handler_data(desc);
	struct tqmx86_gpio_data *gpio = gpiochip_get_data(chip);
	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
	unsigned long irq_bits;
	int i = 0;
	u8 irq_status;

	chained_irq_enter(irq_chip, desc);

	irq_status = tqmx86_gpio_read(gpio, TQMX86_GPIIS);
	tqmx86_gpio_write(gpio, irq_status, TQMX86_GPIIS);

	irq_bits = irq_status;
	for_each_set_bit(i, &irq_bits, TQMX86_NGPI)
		generic_handle_domain_irq(gpio->chip.irq.domain,
					  i + TQMX86_NGPO);

	chained_irq_exit(irq_chip, desc);
}

/* Minimal runtime PM is needed by the IRQ subsystem */
static int __maybe_unused tqmx86_gpio_runtime_suspend(struct device *dev)
{
	return 0;
}

static int __maybe_unused tqmx86_gpio_runtime_resume(struct device *dev)
{
	return 0;
}

static const struct dev_pm_ops tqmx86_gpio_dev_pm_ops = {
	SET_RUNTIME_PM_OPS(tqmx86_gpio_runtime_suspend,
			   tqmx86_gpio_runtime_resume, NULL)
};

static void tqmx86_init_irq_valid_mask(struct gpio_chip *chip,
				       unsigned long *valid_mask,
				       unsigned int ngpios)
{
	/* Only GPIOs 4-7 are valid for interrupts. Clear the others */
	clear_bit(0, valid_mask);
	clear_bit(1, valid_mask);
	clear_bit(2, valid_mask);
	clear_bit(3, valid_mask);
}

static void tqmx86_gpio_irq_print_chip(struct irq_data *d, struct seq_file *p)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);

	seq_printf(p, gc->label);
}

static const struct irq_chip tqmx86_gpio_irq_chip = {
	.irq_mask = tqmx86_gpio_irq_mask,
	.irq_unmask = tqmx86_gpio_irq_unmask,
	.irq_set_type = tqmx86_gpio_irq_set_type,
	.irq_print_chip = tqmx86_gpio_irq_print_chip,
	.flags = IRQCHIP_IMMUTABLE,
	GPIOCHIP_IRQ_RESOURCE_HELPERS,
};

static int tqmx86_gpio_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct tqmx86_gpio_data *gpio;
	struct gpio_chip *chip;
	struct gpio_irq_chip *girq;
	void __iomem *io_base;
	struct resource *res;
	int ret, irq;

	irq = platform_get_irq_optional(pdev, 0);
	if (irq < 0 && irq != -ENXIO)
		return irq;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (!res) {
		dev_err(&pdev->dev, "Cannot get I/O\n");
		return -ENODEV;
	}

	io_base = devm_ioport_map(&pdev->dev, res->start, resource_size(res));
	if (!io_base)
		return -ENOMEM;

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

	raw_spin_lock_init(&gpio->spinlock);
	gpio->io_base = io_base;

	tqmx86_gpio_write(gpio, (u8)~TQMX86_DIR_INPUT_MASK, TQMX86_GPIODD);

	chip = &gpio->chip;
	chip->label = "gpio-tqmx86";
	chip->owner = THIS_MODULE;
	chip->can_sleep = false;
	chip->base = -1;
	chip->direction_input = tqmx86_gpio_direction_input;
	chip->direction_output = tqmx86_gpio_direction_output;
	chip->get_direction = tqmx86_gpio_get_direction;
	chip->get = tqmx86_gpio_get;
	chip->set = tqmx86_gpio_set;
	chip->ngpio = TQMX86_NGPIO;
	chip->parent = pdev->dev.parent;

	pm_runtime_enable(&pdev->dev);

	if (irq > 0) {
		u8 irq_status;

		/* Mask all interrupts */
		tqmx86_gpio_write(gpio, 0, TQMX86_GPIIC);

		/* Clear all pending interrupts */
		irq_status = tqmx86_gpio_read(gpio, TQMX86_GPIIS);
		tqmx86_gpio_write(gpio, irq_status, TQMX86_GPIIS);

		girq = &chip->irq;
		gpio_irq_chip_set_chip(girq, &tqmx86_gpio_irq_chip);
		girq->parent_handler = tqmx86_gpio_irq_handler;
		girq->num_parents = 1;
		girq->parents = devm_kcalloc(&pdev->dev, 1,
					     sizeof(*girq->parents),
					     GFP_KERNEL);
		if (!girq->parents) {
			ret = -ENOMEM;
			goto out_pm_dis;
		}
		girq->parents[0] = irq;
		girq->default_type = IRQ_TYPE_NONE;
		girq->handler = handle_simple_irq;
		girq->init_valid_mask = tqmx86_init_irq_valid_mask;

		irq_domain_set_pm_device(girq->domain, dev);
	}

	ret = devm_gpiochip_add_data(dev, chip, gpio);
	if (ret) {
		dev_err(dev, "Could not register GPIO chip\n");
		goto out_pm_dis;
	}

	dev_info(dev, "GPIO functionality initialized with %d pins\n",
		 chip->ngpio);

	return 0;

out_pm_dis:
	pm_runtime_disable(&pdev->dev);

	return ret;
}

static struct platform_driver tqmx86_gpio_driver = {
	.driver = {
		.name = "tqmx86-gpio",
		.pm = &tqmx86_gpio_dev_pm_ops,
	},
	.probe		= tqmx86_gpio_probe,
};

module_platform_driver(tqmx86_gpio_driver);

MODULE_DESCRIPTION("TQMx86 PLD GPIO Driver");
MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:tqmx86-gpio");
Commit	Line	Data
b868db94 AL	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* TQ-Systems TQMx86 PLD GPIO driver
	4	*
	5	* Based on vendor driver by:
	6	* Vadim V.Vlasov <vvlasov@dev.rtsoft.ru>
	7	*/
	8
	9	#include <linux/bitops.h>
	10	#include <linux/errno.h>
	11	#include <linux/gpio/driver.h>
	12	#include <linux/init.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/pm_runtime.h>
8e43827b	18	#include <linux/seq_file.h>
b868db94 AL	19	#include <linux/slab.h>
	20
	21	#define TQMX86_NGPIO 8
	22	#define TQMX86_NGPO 4 /* 0-3 - output */
	23	#define TQMX86_NGPI 4 /* 4-7 - input */
	24	#define TQMX86_DIR_INPUT_MASK 0xf0 /* 0-3 - output, 4-7 - input */
	25
	26	#define TQMX86_GPIODD 0 /* GPIO Data Direction Register */
	27	#define TQMX86_GPIOD 1 /* GPIO Data Register */
	28	#define TQMX86_GPIIC 3 /* GPI Interrupt Configuration Register */
	29	#define TQMX86_GPIIS 4 /* GPI Interrupt Status Register */
	30
	31	#define TQMX86_GPII_FALLING BIT(0)
	32	#define TQMX86_GPII_RISING BIT(1)
	33	#define TQMX86_GPII_MASK (BIT(0) \| BIT(1))
	34	#define TQMX86_GPII_BITS 2
	35
	36	struct tqmx86_gpio_data {
	37	struct gpio_chip chip;
b868db94 AL	38	void __iomem *io_base;
	39	int irq;
	40	raw_spinlock_t spinlock;
	41	u8 irq_type[TQMX86_NGPI];
	42	};
	43
	44	static u8 tqmx86_gpio_read(struct tqmx86_gpio_data *gd, unsigned int reg)
	45	{
	46	return ioread8(gd->io_base + reg);
	47	}
	48
	49	static void tqmx86_gpio_write(struct tqmx86_gpio_data *gd, u8 val,
	50	unsigned int reg)
	51	{
	52	iowrite8(val, gd->io_base + reg);
	53	}
	54
	55	static int tqmx86_gpio_get(struct gpio_chip *chip, unsigned int offset)
	56	{
	57	struct tqmx86_gpio_data *gpio = gpiochip_get_data(chip);
	58
	59	return !!(tqmx86_gpio_read(gpio, TQMX86_GPIOD) & BIT(offset));
	60	}
	61
	62	static void tqmx86_gpio_set(struct gpio_chip *chip, unsigned int offset,
	63	int value)
	64	{
	65	struct tqmx86_gpio_data *gpio = gpiochip_get_data(chip);
	66	unsigned long flags;
	67	u8 val;
	68
	69	raw_spin_lock_irqsave(&gpio->spinlock, flags);
	70	val = tqmx86_gpio_read(gpio, TQMX86_GPIOD);
	71	if (value)
	72	val \|= BIT(offset);
	73	else
	74	val &= ~BIT(offset);
	75	tqmx86_gpio_write(gpio, val, TQMX86_GPIOD);
	76	raw_spin_unlock_irqrestore(&gpio->spinlock, flags);
	77	}
	78
	79	static int tqmx86_gpio_direction_input(struct gpio_chip *chip,
	80	unsigned int offset)
	81	{
	82	/* Direction cannot be changed. Validate is an input. */
	83	if (BIT(offset) & TQMX86_DIR_INPUT_MASK)
	84	return 0;
	85	else
	86	return -EINVAL;
	87	}
	88
	89	static int tqmx86_gpio_direction_output(struct gpio_chip *chip,
	90	unsigned int offset,
	91	int value)
	92	{
	93	/* Direction cannot be changed, validate is an output */
	94	if (BIT(offset) & TQMX86_DIR_INPUT_MASK)
	95	return -EINVAL;
18fadd6a AL	96
	97	tqmx86_gpio_set(chip, offset, value);
	98	return 0;
b868db94 AL	99	}
	100
	101	static int tqmx86_gpio_get_direction(struct gpio_chip *chip,
	102	unsigned int offset)
	103	{
e42615ec MV	104	if (TQMX86_DIR_INPUT_MASK & BIT(offset))
	105	return GPIO_LINE_DIRECTION_IN;
	106
	107	return GPIO_LINE_DIRECTION_OUT;
b868db94 AL	108	}
	109
	110	static void tqmx86_gpio_irq_mask(struct irq_data *data)
	111	{
	112	unsigned int offset = (data->hwirq - TQMX86_NGPO);
	113	struct tqmx86_gpio_data *gpio = gpiochip_get_data(
	114	irq_data_get_irq_chip_data(data));
	115	unsigned long flags;
	116	u8 gpiic, mask;
	117
	118	mask = TQMX86_GPII_MASK << (offset * TQMX86_GPII_BITS);
	119
	120	raw_spin_lock_irqsave(&gpio->spinlock, flags);
	121	gpiic = tqmx86_gpio_read(gpio, TQMX86_GPIIC);
	122	gpiic &= ~mask;
	123	tqmx86_gpio_write(gpio, gpiic, TQMX86_GPIIC);
	124	raw_spin_unlock_irqrestore(&gpio->spinlock, flags);
8e43827b	125	gpiochip_disable_irq(&gpio->chip, irqd_to_hwirq(data));
b868db94 AL	126	}
	127
	128	static void tqmx86_gpio_irq_unmask(struct irq_data *data)
	129	{
	130	unsigned int offset = (data->hwirq - TQMX86_NGPO);
	131	struct tqmx86_gpio_data *gpio = gpiochip_get_data(
	132	irq_data_get_irq_chip_data(data));
	133	unsigned long flags;
	134	u8 gpiic, mask;
	135
	136	mask = TQMX86_GPII_MASK << (offset * TQMX86_GPII_BITS);
	137
8e43827b	138	gpiochip_enable_irq(&gpio->chip, irqd_to_hwirq(data));
b868db94 AL	139	raw_spin_lock_irqsave(&gpio->spinlock, flags);
	140	gpiic = tqmx86_gpio_read(gpio, TQMX86_GPIIC);
	141	gpiic &= ~mask;
	142	gpiic \|= gpio->irq_type[offset] << (offset * TQMX86_GPII_BITS);
	143	tqmx86_gpio_write(gpio, gpiic, TQMX86_GPIIC);
	144	raw_spin_unlock_irqrestore(&gpio->spinlock, flags);
	145	}
	146
	147	static int tqmx86_gpio_irq_set_type(struct irq_data *data, unsigned int type)
	148	{
	149	struct tqmx86_gpio_data *gpio = gpiochip_get_data(
	150	irq_data_get_irq_chip_data(data));
	151	unsigned int offset = (data->hwirq - TQMX86_NGPO);
	152	unsigned int edge_type = type & IRQF_TRIGGER_MASK;
	153	unsigned long flags;
	154	u8 new_type, gpiic;
	155
	156	switch (edge_type) {
	157	case IRQ_TYPE_EDGE_RISING:
	158	new_type = TQMX86_GPII_RISING;
	159	break;
	160	case IRQ_TYPE_EDGE_FALLING:
	161	new_type = TQMX86_GPII_FALLING;
	162	break;
	163	case IRQ_TYPE_EDGE_BOTH:
	164	new_type = TQMX86_GPII_FALLING \| TQMX86_GPII_RISING;
	165	break;
	166	default:
	167	return -EINVAL; /* not supported */
	168	}
	169
	170	gpio->irq_type[offset] = new_type;
	171
	172	raw_spin_lock_irqsave(&gpio->spinlock, flags);
	173	gpiic = tqmx86_gpio_read(gpio, TQMX86_GPIIC);
	174	gpiic &= ~((TQMX86_GPII_MASK) << (offset * TQMX86_GPII_BITS));
	175	gpiic \|= new_type << (offset * TQMX86_GPII_BITS);
	176	tqmx86_gpio_write(gpio, gpiic, TQMX86_GPIIC);
	177	raw_spin_unlock_irqrestore(&gpio->spinlock, flags);
	178
	179	return 0;
	180	}
	181
	182	static void tqmx86_gpio_irq_handler(struct irq_desc *desc)
	183	{
	184	struct gpio_chip *chip = irq_desc_get_handler_data(desc);
	185	struct tqmx86_gpio_data *gpio = gpiochip_get_data(chip);
	186	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
	187	unsigned long irq_bits;
dbd1c54f	188	int i = 0;
b868db94 AL	189	u8 irq_status;
	190
	191	chained_irq_enter(irq_chip, desc);
	192
	193	irq_status = tqmx86_gpio_read(gpio, TQMX86_GPIIS);
	194	tqmx86_gpio_write(gpio, irq_status, TQMX86_GPIIS);
	195
	196	irq_bits = irq_status;
dbd1c54f MZ	197	for_each_set_bit(i, &irq_bits, TQMX86_NGPI)
	198	generic_handle_domain_irq(gpio->chip.irq.domain,
	199	i + TQMX86_NGPO);
b868db94 AL	200
	201	chained_irq_exit(irq_chip, desc);
	202	}
	203
	204	/* Minimal runtime PM is needed by the IRQ subsystem */
	205	static int __maybe_unused tqmx86_gpio_runtime_suspend(struct device *dev)
	206	{
	207	return 0;
	208	}
	209
	210	static int __maybe_unused tqmx86_gpio_runtime_resume(struct device *dev)
	211	{
	212	return 0;
	213	}
	214
	215	static const struct dev_pm_ops tqmx86_gpio_dev_pm_ops = {
	216	SET_RUNTIME_PM_OPS(tqmx86_gpio_runtime_suspend,
	217	tqmx86_gpio_runtime_resume, NULL)
	218	};
	219
5fbe5b58 LW	220	static void tqmx86_init_irq_valid_mask(struct gpio_chip *chip,
	221	unsigned long *valid_mask,
	222	unsigned int ngpios)
	223	{
	224	/* Only GPIOs 4-7 are valid for interrupts. Clear the others */
	225	clear_bit(0, valid_mask);
	226	clear_bit(1, valid_mask);
	227	clear_bit(2, valid_mask);
	228	clear_bit(3, valid_mask);
	229	}
	230
8e43827b LW	231	static void tqmx86_gpio_irq_print_chip(struct irq_data d, struct seq_file p)
	232	{
	233	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	234
	235	seq_printf(p, gc->label);
	236	}
	237
	238	static const struct irq_chip tqmx86_gpio_irq_chip = {
	239	.irq_mask = tqmx86_gpio_irq_mask,
	240	.irq_unmask = tqmx86_gpio_irq_unmask,
	241	.irq_set_type = tqmx86_gpio_irq_set_type,
	242	.irq_print_chip = tqmx86_gpio_irq_print_chip,
	243	.flags = IRQCHIP_IMMUTABLE,
	244	GPIOCHIP_IRQ_RESOURCE_HELPERS,
	245	};
	246
b868db94 AL	247	static int tqmx86_gpio_probe(struct platform_device *pdev)
	248	{
	249	struct device *dev = &pdev->dev;
	250	struct tqmx86_gpio_data *gpio;
	251	struct gpio_chip *chip;
74639d66	252	struct gpio_irq_chip *girq;
b868db94 AL	253	void __iomem *io_base;
	254	struct resource *res;
	255	int ret, irq;
	256
9b87f435 MS	257	irq = platform_get_irq_optional(pdev, 0);
9b87f435 MS	258	if (irq < 0 && irq != -ENXIO)
b868db94 AL	259	return irq;
	260
	261	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	262	if (!res) {
	263	dev_err(&pdev->dev, "Cannot get I/O\n");
	264	return -ENODEV;
	265	}
	266
	267	io_base = devm_ioport_map(&pdev->dev, res->start, resource_size(res));
	268	if (!io_base)
	269	return -ENOMEM;
	270
	271	gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL);
	272	if (!gpio)
	273	return -ENOMEM;
	274
	275	raw_spin_lock_init(&gpio->spinlock);
	276	gpio->io_base = io_base;
	277
	278	tqmx86_gpio_write(gpio, (u8)~TQMX86_DIR_INPUT_MASK, TQMX86_GPIODD);
	279
b868db94 AL	280	chip = &gpio->chip;
	281	chip->label = "gpio-tqmx86";
	282	chip->owner = THIS_MODULE;
	283	chip->can_sleep = false;
	284	chip->base = -1;
	285	chip->direction_input = tqmx86_gpio_direction_input;
	286	chip->direction_output = tqmx86_gpio_direction_output;
	287	chip->get_direction = tqmx86_gpio_get_direction;
	288	chip->get = tqmx86_gpio_get;
	289	chip->set = tqmx86_gpio_set;
	290	chip->ngpio = TQMX86_NGPIO;
b868db94 AL	291	chip->parent = pdev->dev.parent;
	292
	293	pm_runtime_enable(&pdev->dev);
	294
9b87f435	295	if (irq > 0) {
b868db94 AL	296	u8 irq_status;
b868db94 AL	297
b868db94 AL	298	/* Mask all interrupts */
	299	tqmx86_gpio_write(gpio, 0, TQMX86_GPIIC);
	300
	301	/* Clear all pending interrupts */
	302	irq_status = tqmx86_gpio_read(gpio, TQMX86_GPIIS);
	303	tqmx86_gpio_write(gpio, irq_status, TQMX86_GPIIS);
	304
74639d66	305	girq = &chip->irq;
8e43827b	306	gpio_irq_chip_set_chip(girq, &tqmx86_gpio_irq_chip);
74639d66 LW	307	girq->parent_handler = tqmx86_gpio_irq_handler;
	308	girq->num_parents = 1;
	309	girq->parents = devm_kcalloc(&pdev->dev, 1,
	310	sizeof(*girq->parents),
	311	GFP_KERNEL);
	312	if (!girq->parents) {
	313	ret = -ENOMEM;
96be65d1	314	goto out_pm_dis;
b868db94	315	}
74639d66 LW	316	girq->parents[0] = irq;
	317	girq->default_type = IRQ_TYPE_NONE;
	318	girq->handler = handle_simple_irq;
5fbe5b58	319	girq->init_valid_mask = tqmx86_init_irq_valid_mask;
21a9acc1 DM	320
21a9acc1 DM	321	irq_domain_set_pm_device(girq->domain, dev);
74639d66	322	}
b868db94	323
74639d66 LW	324	ret = devm_gpiochip_add_data(dev, chip, gpio);
	325	if (ret) {
	326	dev_err(dev, "Could not register GPIO chip\n");
	327	goto out_pm_dis;
b868db94 AL	328	}
b868db94 AL	329
b868db94 AL	330	dev_info(dev, "GPIO functionality initialized with %d pins\n",
	331	chip->ngpio);
	332
	333	return 0;
	334
b868db94 AL	335	out_pm_dis:
	336	pm_runtime_disable(&pdev->dev);
	337
	338	return ret;
	339	}
	340
	341	static struct platform_driver tqmx86_gpio_driver = {
	342	.driver = {
	343	.name = "tqmx86-gpio",
	344	.pm = &tqmx86_gpio_dev_pm_ops,
	345	},
	346	.probe = tqmx86_gpio_probe,
	347	};
	348
	349	module_platform_driver(tqmx86_gpio_driver);
	350
	351	MODULE_DESCRIPTION("TQMx86 PLD GPIO Driver");
	352	MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
	353	MODULE_LICENSE("GPL");
	354	MODULE_ALIAS("platform:tqmx86-gpio");