drivers/gpio/gpio-etraxfs.c - arm/linux - Git at Google

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/gpio/driver.h>
 #include <linux/of_gpio.h>
 #include <linux/io.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>

 #define ETRAX_FS_rw_pa_dout	0
 #define ETRAX_FS_r_pa_din	4
 #define ETRAX_FS_rw_pa_oe	8
 #define ETRAX_FS_rw_intr_cfg	12
 #define ETRAX_FS_rw_intr_mask	16
 #define ETRAX_FS_rw_ack_intr	20
 #define ETRAX_FS_r_intr		24
 #define ETRAX_FS_r_masked_intr	28
 #define ETRAX_FS_rw_pb_dout	32
 #define ETRAX_FS_r_pb_din	36
 #define ETRAX_FS_rw_pb_oe	40
 #define ETRAX_FS_rw_pc_dout	48
 #define ETRAX_FS_r_pc_din	52
 #define ETRAX_FS_rw_pc_oe	56
 #define ETRAX_FS_rw_pd_dout	64
 #define ETRAX_FS_r_pd_din	68
 #define ETRAX_FS_rw_pd_oe	72
 #define ETRAX_FS_rw_pe_dout	80
 #define ETRAX_FS_r_pe_din	84
 #define ETRAX_FS_rw_pe_oe	88

 #define ARTPEC3_r_pa_din	0
 #define ARTPEC3_rw_pa_dout	4
 #define ARTPEC3_rw_pa_oe	8
 #define ARTPEC3_r_pb_din	44
 #define ARTPEC3_rw_pb_dout	48
 #define ARTPEC3_rw_pb_oe	52
 #define ARTPEC3_r_pc_din	88
 #define ARTPEC3_rw_pc_dout	92
 #define ARTPEC3_rw_pc_oe	96
 #define ARTPEC3_r_pd_din	116
 #define ARTPEC3_rw_intr_cfg	120
 #define ARTPEC3_rw_intr_pins	124
 #define ARTPEC3_rw_intr_mask	128
 #define ARTPEC3_rw_ack_intr	132
 #define ARTPEC3_r_masked_intr	140

 #define GIO_CFG_OFF		0
 #define GIO_CFG_HI		1
 #define GIO_CFG_LO		2
 #define GIO_CFG_SET		3
 #define GIO_CFG_POSEDGE		5
 #define GIO_CFG_NEGEDGE		6
 #define GIO_CFG_ANYEDGE		7

 struct etraxfs_gpio_info;

 struct etraxfs_gpio_block {
 	raw_spinlock_t lock;
 	u32 mask;
 	u32 cfg;
 	u32 pins;
 	unsigned int group[8];

 	void __iomem *regs;
 	const struct etraxfs_gpio_info *info;
 };

 struct etraxfs_gpio_chip {
 	struct gpio_chip gc;
 	struct etraxfs_gpio_block *block;
 };

 struct etraxfs_gpio_port {
 	const char *label;
 	unsigned int oe;
 	unsigned int dout;
 	unsigned int din;
 	unsigned int ngpio;
 };

 struct etraxfs_gpio_info {
 	unsigned int num_ports;
 	const struct etraxfs_gpio_port *ports;

 	unsigned int rw_ack_intr;
 	unsigned int rw_intr_mask;
 	unsigned int rw_intr_cfg;
 	unsigned int rw_intr_pins;
 	unsigned int r_masked_intr;
 };

 static const struct etraxfs_gpio_port etraxfs_gpio_etraxfs_ports[] = {
 	{
 		.label	= "A",
 		.ngpio	= 8,
 		.oe	= ETRAX_FS_rw_pa_oe,
 		.dout	= ETRAX_FS_rw_pa_dout,
 		.din	= ETRAX_FS_r_pa_din,
 	},
 	{
 		.label	= "B",
 		.ngpio	= 18,
 		.oe	= ETRAX_FS_rw_pb_oe,
 		.dout	= ETRAX_FS_rw_pb_dout,
 		.din	= ETRAX_FS_r_pb_din,
 	},
 	{
 		.label	= "C",
 		.ngpio	= 18,
 		.oe	= ETRAX_FS_rw_pc_oe,
 		.dout	= ETRAX_FS_rw_pc_dout,
 		.din	= ETRAX_FS_r_pc_din,
 	},
 	{
 		.label	= "D",
 		.ngpio	= 18,
 		.oe	= ETRAX_FS_rw_pd_oe,
 		.dout	= ETRAX_FS_rw_pd_dout,
 		.din	= ETRAX_FS_r_pd_din,
 	},
 	{
 		.label	= "E",
 		.ngpio	= 18,
 		.oe	= ETRAX_FS_rw_pe_oe,
 		.dout	= ETRAX_FS_rw_pe_dout,
 		.din	= ETRAX_FS_r_pe_din,
 	},
 };

 static const struct etraxfs_gpio_info etraxfs_gpio_etraxfs = {
 	.num_ports = ARRAY_SIZE(etraxfs_gpio_etraxfs_ports),
 	.ports = etraxfs_gpio_etraxfs_ports,
 	.rw_ack_intr	= ETRAX_FS_rw_ack_intr,
 	.rw_intr_mask	= ETRAX_FS_rw_intr_mask,
 	.rw_intr_cfg	= ETRAX_FS_rw_intr_cfg,
 	.r_masked_intr	= ETRAX_FS_r_masked_intr,
 };

 static const struct etraxfs_gpio_port etraxfs_gpio_artpec3_ports[] = {
 	{
 		.label	= "A",
 		.ngpio	= 32,
 		.oe	= ARTPEC3_rw_pa_oe,
 		.dout	= ARTPEC3_rw_pa_dout,
 		.din	= ARTPEC3_r_pa_din,
 	},
 	{
 		.label	= "B",
 		.ngpio	= 32,
 		.oe	= ARTPEC3_rw_pb_oe,
 		.dout	= ARTPEC3_rw_pb_dout,
 		.din	= ARTPEC3_r_pb_din,
 	},
 	{
 		.label	= "C",
 		.ngpio	= 16,
 		.oe	= ARTPEC3_rw_pc_oe,
 		.dout	= ARTPEC3_rw_pc_dout,
 		.din	= ARTPEC3_r_pc_din,
 	},
 	{
 		.label	= "D",
 		.ngpio	= 32,
 		.din	= ARTPEC3_r_pd_din,
 	},
 };

 static const struct etraxfs_gpio_info etraxfs_gpio_artpec3 = {
 	.num_ports = ARRAY_SIZE(etraxfs_gpio_artpec3_ports),
 	.ports = etraxfs_gpio_artpec3_ports,
 	.rw_ack_intr	= ARTPEC3_rw_ack_intr,
 	.rw_intr_mask	= ARTPEC3_rw_intr_mask,
 	.rw_intr_cfg	= ARTPEC3_rw_intr_cfg,
 	.r_masked_intr	= ARTPEC3_r_masked_intr,
 	.rw_intr_pins	= ARTPEC3_rw_intr_pins,
 };

 static unsigned int etraxfs_gpio_chip_to_port(struct gpio_chip *gc)
 {
 	return gc->label[0] - 'A';
 }

 static int etraxfs_gpio_of_xlate(struct gpio_chip *gc,
 			       const struct of_phandle_args *gpiospec,
 			       u32 *flags)
 {
 	/*
 	 * Port numbers are A to E, and the properties are integers, so we
 	 * specify them as 0xA - 0xE.
 	 */
 	if (etraxfs_gpio_chip_to_port(gc) + 0xA != gpiospec->args[2])
 		return -EINVAL;

 	return of_gpio_simple_xlate(gc, gpiospec, flags);
 }

 static const struct of_device_id etraxfs_gpio_of_table[] = {
 	{
 		.compatible = "axis,etraxfs-gio",
 		.data = &etraxfs_gpio_etraxfs,
 	},
 	{
 		.compatible = "axis,artpec3-gio",
 		.data = &etraxfs_gpio_artpec3,
 	},
 	{},
 };

 static unsigned int etraxfs_gpio_to_group_irq(unsigned int gpio)
 {
 	return gpio % 8;
 }

 static unsigned int etraxfs_gpio_to_group_pin(struct etraxfs_gpio_chip *chip,
 					      unsigned int gpio)
 {
 	return 4 * etraxfs_gpio_chip_to_port(&chip->gc) + gpio / 8;
 }

 static void etraxfs_gpio_irq_ack(struct irq_data *d)
 {
 	struct etraxfs_gpio_chip *chip =
 		gpiochip_get_data(irq_data_get_irq_chip_data(d));
 	struct etraxfs_gpio_block *block = chip->block;
 	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);

 	writel(BIT(grpirq), block->regs + block->info->rw_ack_intr);
 }

 static void etraxfs_gpio_irq_mask(struct irq_data *d)
 {
 	struct etraxfs_gpio_chip *chip =
 		gpiochip_get_data(irq_data_get_irq_chip_data(d));
 	struct etraxfs_gpio_block *block = chip->block;
 	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);

 	raw_spin_lock(&block->lock);
 	block->mask &= ~BIT(grpirq);
 	writel(block->mask, block->regs + block->info->rw_intr_mask);
 	raw_spin_unlock(&block->lock);
 }

 static void etraxfs_gpio_irq_unmask(struct irq_data *d)
 {
 	struct etraxfs_gpio_chip *chip =
 		gpiochip_get_data(irq_data_get_irq_chip_data(d));
 	struct etraxfs_gpio_block *block = chip->block;
 	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);

 	raw_spin_lock(&block->lock);
 	block->mask |= BIT(grpirq);
 	writel(block->mask, block->regs + block->info->rw_intr_mask);
 	raw_spin_unlock(&block->lock);
 }

 static int etraxfs_gpio_irq_set_type(struct irq_data *d, u32 type)
 {
 	struct etraxfs_gpio_chip *chip =
 		gpiochip_get_data(irq_data_get_irq_chip_data(d));
 	struct etraxfs_gpio_block *block = chip->block;
 	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);
 	u32 cfg;

 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
 		cfg = GIO_CFG_POSEDGE;
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		cfg = GIO_CFG_NEGEDGE;
 		break;
 	case IRQ_TYPE_EDGE_BOTH:
 		cfg = GIO_CFG_ANYEDGE;
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		cfg = GIO_CFG_LO;
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		cfg = GIO_CFG_HI;
 		break;
 	default:
 		return -EINVAL;
 	}

 	raw_spin_lock(&block->lock);
 	block->cfg &= ~(0x7 << (grpirq * 3));
 	block->cfg |= (cfg << (grpirq * 3));
 	writel(block->cfg, block->regs + block->info->rw_intr_cfg);
 	raw_spin_unlock(&block->lock);

 	return 0;
 }

 static int etraxfs_gpio_irq_request_resources(struct irq_data *d)
 {
 	struct etraxfs_gpio_chip *chip =
 		gpiochip_get_data(irq_data_get_irq_chip_data(d));
 	struct etraxfs_gpio_block *block = chip->block;
 	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);
 	int ret = -EBUSY;

 	raw_spin_lock(&block->lock);
 	if (block->group[grpirq])
 		goto out;

 	ret = gpiochip_lock_as_irq(&chip->gc, d->hwirq);
 	if (ret)
 		goto out;

 	block->group[grpirq] = d->irq;
 	if (block->info->rw_intr_pins) {
 		unsigned int pin = etraxfs_gpio_to_group_pin(chip, d->hwirq);

 		block->pins &= ~(0xf << (grpirq * 4));
 		block->pins |= (pin << (grpirq * 4));

 		writel(block->pins, block->regs + block->info->rw_intr_pins);
 	}

 out:
 	raw_spin_unlock(&block->lock);
 	return ret;
 }

 static void etraxfs_gpio_irq_release_resources(struct irq_data *d)
 {
 	struct etraxfs_gpio_chip *chip =
 		gpiochip_get_data(irq_data_get_irq_chip_data(d));
 	struct etraxfs_gpio_block *block = chip->block;
 	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);

 	raw_spin_lock(&block->lock);
 	block->group[grpirq] = 0;
 	gpiochip_unlock_as_irq(&chip->gc, d->hwirq);
 	raw_spin_unlock(&block->lock);
 }

 static struct irq_chip etraxfs_gpio_irq_chip = {
 	.name		= "gpio-etraxfs",
 	.irq_ack	= etraxfs_gpio_irq_ack,
 	.irq_mask	= etraxfs_gpio_irq_mask,
 	.irq_unmask	= etraxfs_gpio_irq_unmask,
 	.irq_set_type	= etraxfs_gpio_irq_set_type,
 	.irq_request_resources = etraxfs_gpio_irq_request_resources,
 	.irq_release_resources = etraxfs_gpio_irq_release_resources,
 };

 static irqreturn_t etraxfs_gpio_interrupt(int irq, void *dev_id)
 {
 	struct etraxfs_gpio_block *block = dev_id;
 	unsigned long intr = readl(block->regs + block->info->r_masked_intr);
 	int bit;

 	for_each_set_bit(bit, &intr, 8)
 		generic_handle_irq(block->group[bit]);

 	return IRQ_RETVAL(intr & 0xff);
 }

 static int etraxfs_gpio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	const struct etraxfs_gpio_info *info;
 	const struct of_device_id *match;
 	struct etraxfs_gpio_block *block;
 	struct etraxfs_gpio_chip *chips;
 	struct resource *res, *irq;
 	bool allportsirq = false;
 	void __iomem *regs;
 	int ret;
 	int i;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	regs = devm_ioremap_resource(dev, res);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);

 	match = of_match_node(etraxfs_gpio_of_table, dev->of_node);
 	if (!match)
 		return -EINVAL;

 	info = match->data;

 	chips = devm_kzalloc(dev, sizeof(*chips) * info->num_ports, GFP_KERNEL);
 	if (!chips)
 		return -ENOMEM;

 	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (!irq)
 		return -EINVAL;

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

 	raw_spin_lock_init(&block->lock);

 	block->regs = regs;
 	block->info = info;

 	writel(0, block->regs + info->rw_intr_mask);
 	writel(0, block->regs + info->rw_intr_cfg);
 	if (info->rw_intr_pins) {
 		allportsirq = true;
 		writel(0, block->regs + info->rw_intr_pins);
 	}

 	ret = devm_request_irq(dev, irq->start, etraxfs_gpio_interrupt,
 			       IRQF_SHARED, dev_name(dev), block);
 	if (ret) {
 		dev_err(dev, "Unable to request irq %d\n", ret);
 		return ret;
 	}

 	for (i = 0; i < info->num_ports; i++) {
 		struct etraxfs_gpio_chip *chip = &chips[i];
 		struct gpio_chip *gc = &chip->gc;
 		const struct etraxfs_gpio_port *port = &info->ports[i];
 		unsigned long flags = BGPIOF_READ_OUTPUT_REG_SET;
 		void __iomem *dat = regs + port->din;
 		void __iomem *set = regs + port->dout;
 		void __iomem *dirout = regs + port->oe;

 		chip->block = block;

 		if (dirout == set) {
 			dirout = set = NULL;
 			flags = BGPIOF_NO_OUTPUT;
 		}

 		ret = bgpio_init(gc, dev, 4,
 				 dat, set, NULL, dirout, NULL,
 				 flags);
 		if (ret) {
 			dev_err(dev, "Unable to init port %s\n",
 				port->label);
 			continue;
 		}

 		gc->ngpio = port->ngpio;
 		gc->label = port->label;

 		gc->of_node = dev->of_node;
 		gc->of_gpio_n_cells = 3;
 		gc->of_xlate = etraxfs_gpio_of_xlate;

 		ret = gpiochip_add_data(gc, chip);
 		if (ret) {
 			dev_err(dev, "Unable to register port %s\n",
 				gc->label);
 			continue;
 		}

 		if (i > 0 && !allportsirq)
 			continue;

 		ret = gpiochip_irqchip_add(gc, &etraxfs_gpio_irq_chip, 0,
 					   handle_level_irq, IRQ_TYPE_NONE);
 		if (ret) {
 			dev_err(dev, "Unable to add irqchip to port %s\n",
 				gc->label);
 		}
 	}

 	return 0;
 }

 static struct platform_driver etraxfs_gpio_driver = {
 	.driver = {
 		.name		= "etraxfs-gpio",
 		.of_match_table = of_match_ptr(etraxfs_gpio_of_table),
 	},
 	.probe	= etraxfs_gpio_probe,
 };

 builtin_platform_driver(etraxfs_gpio_driver);
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/gpio/driver.h>
	#include <linux/of_gpio.h>
	#include <linux/io.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>

	#define ETRAX_FS_rw_pa_dout 0
	#define ETRAX_FS_r_pa_din 4
	#define ETRAX_FS_rw_pa_oe 8
	#define ETRAX_FS_rw_intr_cfg 12
	#define ETRAX_FS_rw_intr_mask 16
	#define ETRAX_FS_rw_ack_intr 20
	#define ETRAX_FS_r_intr 24
	#define ETRAX_FS_r_masked_intr 28
	#define ETRAX_FS_rw_pb_dout 32
	#define ETRAX_FS_r_pb_din 36
	#define ETRAX_FS_rw_pb_oe 40
	#define ETRAX_FS_rw_pc_dout 48
	#define ETRAX_FS_r_pc_din 52
	#define ETRAX_FS_rw_pc_oe 56
	#define ETRAX_FS_rw_pd_dout 64
	#define ETRAX_FS_r_pd_din 68
	#define ETRAX_FS_rw_pd_oe 72
	#define ETRAX_FS_rw_pe_dout 80
	#define ETRAX_FS_r_pe_din 84
	#define ETRAX_FS_rw_pe_oe 88

	#define ARTPEC3_r_pa_din 0
	#define ARTPEC3_rw_pa_dout 4
	#define ARTPEC3_rw_pa_oe 8
	#define ARTPEC3_r_pb_din 44
	#define ARTPEC3_rw_pb_dout 48
	#define ARTPEC3_rw_pb_oe 52
	#define ARTPEC3_r_pc_din 88
	#define ARTPEC3_rw_pc_dout 92
	#define ARTPEC3_rw_pc_oe 96
	#define ARTPEC3_r_pd_din 116
	#define ARTPEC3_rw_intr_cfg 120
	#define ARTPEC3_rw_intr_pins 124
	#define ARTPEC3_rw_intr_mask 128
	#define ARTPEC3_rw_ack_intr 132
	#define ARTPEC3_r_masked_intr 140

	#define GIO_CFG_OFF 0
	#define GIO_CFG_HI 1
	#define GIO_CFG_LO 2
	#define GIO_CFG_SET 3
	#define GIO_CFG_POSEDGE 5
	#define GIO_CFG_NEGEDGE 6
	#define GIO_CFG_ANYEDGE 7

	struct etraxfs_gpio_info;

	struct etraxfs_gpio_block {
	raw_spinlock_t lock;
	u32 mask;
	u32 cfg;
	u32 pins;
	unsigned int group[8];

	void __iomem *regs;
	const struct etraxfs_gpio_info *info;
	};

	struct etraxfs_gpio_chip {
	struct gpio_chip gc;
	struct etraxfs_gpio_block *block;
	};

	struct etraxfs_gpio_port {
	const char *label;
	unsigned int oe;
	unsigned int dout;
	unsigned int din;
	unsigned int ngpio;
	};

	struct etraxfs_gpio_info {
	unsigned int num_ports;
	const struct etraxfs_gpio_port *ports;

	unsigned int rw_ack_intr;
	unsigned int rw_intr_mask;
	unsigned int rw_intr_cfg;
	unsigned int rw_intr_pins;
	unsigned int r_masked_intr;
	};

	static const struct etraxfs_gpio_port etraxfs_gpio_etraxfs_ports[] = {
	{
	.label = "A",
	.ngpio = 8,
	.oe = ETRAX_FS_rw_pa_oe,
	.dout = ETRAX_FS_rw_pa_dout,
	.din = ETRAX_FS_r_pa_din,
	},
	{
	.label = "B",
	.ngpio = 18,
	.oe = ETRAX_FS_rw_pb_oe,
	.dout = ETRAX_FS_rw_pb_dout,
	.din = ETRAX_FS_r_pb_din,
	},
	{
	.label = "C",
	.ngpio = 18,
	.oe = ETRAX_FS_rw_pc_oe,
	.dout = ETRAX_FS_rw_pc_dout,
	.din = ETRAX_FS_r_pc_din,
	},
	{
	.label = "D",
	.ngpio = 18,
	.oe = ETRAX_FS_rw_pd_oe,
	.dout = ETRAX_FS_rw_pd_dout,
	.din = ETRAX_FS_r_pd_din,
	},
	{
	.label = "E",
	.ngpio = 18,
	.oe = ETRAX_FS_rw_pe_oe,
	.dout = ETRAX_FS_rw_pe_dout,
	.din = ETRAX_FS_r_pe_din,
	},
	};

	static const struct etraxfs_gpio_info etraxfs_gpio_etraxfs = {
	.num_ports = ARRAY_SIZE(etraxfs_gpio_etraxfs_ports),
	.ports = etraxfs_gpio_etraxfs_ports,
	.rw_ack_intr = ETRAX_FS_rw_ack_intr,
	.rw_intr_mask = ETRAX_FS_rw_intr_mask,
	.rw_intr_cfg = ETRAX_FS_rw_intr_cfg,
	.r_masked_intr = ETRAX_FS_r_masked_intr,
	};

	static const struct etraxfs_gpio_port etraxfs_gpio_artpec3_ports[] = {
	{
	.label = "A",
	.ngpio = 32,
	.oe = ARTPEC3_rw_pa_oe,
	.dout = ARTPEC3_rw_pa_dout,
	.din = ARTPEC3_r_pa_din,
	},
	{
	.label = "B",
	.ngpio = 32,
	.oe = ARTPEC3_rw_pb_oe,
	.dout = ARTPEC3_rw_pb_dout,
	.din = ARTPEC3_r_pb_din,
	},
	{
	.label = "C",
	.ngpio = 16,
	.oe = ARTPEC3_rw_pc_oe,
	.dout = ARTPEC3_rw_pc_dout,
	.din = ARTPEC3_r_pc_din,
	},
	{
	.label = "D",
	.ngpio = 32,
	.din = ARTPEC3_r_pd_din,
	},
	};

	static const struct etraxfs_gpio_info etraxfs_gpio_artpec3 = {
	.num_ports = ARRAY_SIZE(etraxfs_gpio_artpec3_ports),
	.ports = etraxfs_gpio_artpec3_ports,
	.rw_ack_intr = ARTPEC3_rw_ack_intr,
	.rw_intr_mask = ARTPEC3_rw_intr_mask,
	.rw_intr_cfg = ARTPEC3_rw_intr_cfg,
	.r_masked_intr = ARTPEC3_r_masked_intr,
	.rw_intr_pins = ARTPEC3_rw_intr_pins,
	};

	static unsigned int etraxfs_gpio_chip_to_port(struct gpio_chip *gc)
	{
	return gc->label[0] - 'A';
	}

	static int etraxfs_gpio_of_xlate(struct gpio_chip *gc,
	const struct of_phandle_args *gpiospec,
	u32 *flags)
	{
	/*
	* Port numbers are A to E, and the properties are integers, so we
	* specify them as 0xA - 0xE.
	*/
	if (etraxfs_gpio_chip_to_port(gc) + 0xA != gpiospec->args[2])
	return -EINVAL;

	return of_gpio_simple_xlate(gc, gpiospec, flags);
	}

	static const struct of_device_id etraxfs_gpio_of_table[] = {
	{
	.compatible = "axis,etraxfs-gio",
	.data = &etraxfs_gpio_etraxfs,
	},
	{
	.compatible = "axis,artpec3-gio",
	.data = &etraxfs_gpio_artpec3,
	},
	{},
	};

	static unsigned int etraxfs_gpio_to_group_irq(unsigned int gpio)
	{
	return gpio % 8;
	}

	static unsigned int etraxfs_gpio_to_group_pin(struct etraxfs_gpio_chip *chip,
	unsigned int gpio)
	{
	return 4 * etraxfs_gpio_chip_to_port(&chip->gc) + gpio / 8;
	}

	static void etraxfs_gpio_irq_ack(struct irq_data *d)
	{
	struct etraxfs_gpio_chip *chip =
	gpiochip_get_data(irq_data_get_irq_chip_data(d));
	struct etraxfs_gpio_block *block = chip->block;
	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);

	writel(BIT(grpirq), block->regs + block->info->rw_ack_intr);
	}

	static void etraxfs_gpio_irq_mask(struct irq_data *d)
	{
	struct etraxfs_gpio_chip *chip =
	gpiochip_get_data(irq_data_get_irq_chip_data(d));
	struct etraxfs_gpio_block *block = chip->block;
	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);

	raw_spin_lock(&block->lock);
	block->mask &= ~BIT(grpirq);
	writel(block->mask, block->regs + block->info->rw_intr_mask);
	raw_spin_unlock(&block->lock);
	}

	static void etraxfs_gpio_irq_unmask(struct irq_data *d)
	{
	struct etraxfs_gpio_chip *chip =
	gpiochip_get_data(irq_data_get_irq_chip_data(d));
	struct etraxfs_gpio_block *block = chip->block;
	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);

	raw_spin_lock(&block->lock);
	block->mask \|= BIT(grpirq);
	writel(block->mask, block->regs + block->info->rw_intr_mask);
	raw_spin_unlock(&block->lock);
	}

	static int etraxfs_gpio_irq_set_type(struct irq_data *d, u32 type)
	{
	struct etraxfs_gpio_chip *chip =
	gpiochip_get_data(irq_data_get_irq_chip_data(d));
	struct etraxfs_gpio_block *block = chip->block;
	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);
	u32 cfg;

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
	cfg = GIO_CFG_POSEDGE;
	break;
	case IRQ_TYPE_EDGE_FALLING:
	cfg = GIO_CFG_NEGEDGE;
	break;
	case IRQ_TYPE_EDGE_BOTH:
	cfg = GIO_CFG_ANYEDGE;
	break;
	case IRQ_TYPE_LEVEL_LOW:
	cfg = GIO_CFG_LO;
	break;
	case IRQ_TYPE_LEVEL_HIGH:
	cfg = GIO_CFG_HI;
	break;
	default:
	return -EINVAL;
	}

	raw_spin_lock(&block->lock);
	block->cfg &= ~(0x7 << (grpirq * 3));
	block->cfg \|= (cfg << (grpirq * 3));
	writel(block->cfg, block->regs + block->info->rw_intr_cfg);
	raw_spin_unlock(&block->lock);

	return 0;
	}

	static int etraxfs_gpio_irq_request_resources(struct irq_data *d)
	{
	struct etraxfs_gpio_chip *chip =
	gpiochip_get_data(irq_data_get_irq_chip_data(d));
	struct etraxfs_gpio_block *block = chip->block;
	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);
	int ret = -EBUSY;

	raw_spin_lock(&block->lock);
	if (block->group[grpirq])
	goto out;

	ret = gpiochip_lock_as_irq(&chip->gc, d->hwirq);
	if (ret)
	goto out;

	block->group[grpirq] = d->irq;
	if (block->info->rw_intr_pins) {
	unsigned int pin = etraxfs_gpio_to_group_pin(chip, d->hwirq);

	block->pins &= ~(0xf << (grpirq * 4));
	block->pins \|= (pin << (grpirq * 4));

	writel(block->pins, block->regs + block->info->rw_intr_pins);
	}

	out:
	raw_spin_unlock(&block->lock);
	return ret;
	}

	static void etraxfs_gpio_irq_release_resources(struct irq_data *d)
	{
	struct etraxfs_gpio_chip *chip =
	gpiochip_get_data(irq_data_get_irq_chip_data(d));
	struct etraxfs_gpio_block *block = chip->block;
	unsigned int grpirq = etraxfs_gpio_to_group_irq(d->hwirq);

	raw_spin_lock(&block->lock);
	block->group[grpirq] = 0;
	gpiochip_unlock_as_irq(&chip->gc, d->hwirq);
	raw_spin_unlock(&block->lock);
	}

	static struct irq_chip etraxfs_gpio_irq_chip = {
	.name = "gpio-etraxfs",
	.irq_ack = etraxfs_gpio_irq_ack,
	.irq_mask = etraxfs_gpio_irq_mask,
	.irq_unmask = etraxfs_gpio_irq_unmask,
	.irq_set_type = etraxfs_gpio_irq_set_type,
	.irq_request_resources = etraxfs_gpio_irq_request_resources,
	.irq_release_resources = etraxfs_gpio_irq_release_resources,
	};

	static irqreturn_t etraxfs_gpio_interrupt(int irq, void *dev_id)
	{
	struct etraxfs_gpio_block *block = dev_id;
	unsigned long intr = readl(block->regs + block->info->r_masked_intr);
	int bit;

	for_each_set_bit(bit, &intr, 8)
	generic_handle_irq(block->group[bit]);

	return IRQ_RETVAL(intr & 0xff);
	}

	static int etraxfs_gpio_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	const struct etraxfs_gpio_info *info;
	const struct of_device_id *match;
	struct etraxfs_gpio_block *block;
	struct etraxfs_gpio_chip *chips;
	struct resource res, irq;
	bool allportsirq = false;
	void __iomem *regs;
	int ret;
	int i;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	regs = devm_ioremap_resource(dev, res);
	if (IS_ERR(regs))
	return PTR_ERR(regs);

	match = of_match_node(etraxfs_gpio_of_table, dev->of_node);
	if (!match)
	return -EINVAL;

	info = match->data;

	chips = devm_kzalloc(dev, sizeof(chips) info->num_ports, GFP_KERNEL);
	if (!chips)
	return -ENOMEM;

	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!irq)
	return -EINVAL;

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

	raw_spin_lock_init(&block->lock);

	block->regs = regs;
	block->info = info;

	writel(0, block->regs + info->rw_intr_mask);
	writel(0, block->regs + info->rw_intr_cfg);
	if (info->rw_intr_pins) {
	allportsirq = true;
	writel(0, block->regs + info->rw_intr_pins);
	}

	ret = devm_request_irq(dev, irq->start, etraxfs_gpio_interrupt,
	IRQF_SHARED, dev_name(dev), block);
	if (ret) {
	dev_err(dev, "Unable to request irq %d\n", ret);
	return ret;
	}

	for (i = 0; i < info->num_ports; i++) {
	struct etraxfs_gpio_chip *chip = &chips[i];
	struct gpio_chip *gc = &chip->gc;
	const struct etraxfs_gpio_port *port = &info->ports[i];
	unsigned long flags = BGPIOF_READ_OUTPUT_REG_SET;
	void __iomem *dat = regs + port->din;
	void __iomem *set = regs + port->dout;
	void __iomem *dirout = regs + port->oe;

	chip->block = block;

	if (dirout == set) {
	dirout = set = NULL;
	flags = BGPIOF_NO_OUTPUT;
	}

	ret = bgpio_init(gc, dev, 4,
	dat, set, NULL, dirout, NULL,
	flags);
	if (ret) {
	dev_err(dev, "Unable to init port %s\n",
	port->label);
	continue;
	}

	gc->ngpio = port->ngpio;
	gc->label = port->label;

	gc->of_node = dev->of_node;
	gc->of_gpio_n_cells = 3;
	gc->of_xlate = etraxfs_gpio_of_xlate;

	ret = gpiochip_add_data(gc, chip);
	if (ret) {
	dev_err(dev, "Unable to register port %s\n",
	gc->label);
	continue;
	}

	if (i > 0 && !allportsirq)
	continue;

	ret = gpiochip_irqchip_add(gc, &etraxfs_gpio_irq_chip, 0,
	handle_level_irq, IRQ_TYPE_NONE);
	if (ret) {
	dev_err(dev, "Unable to add irqchip to port %s\n",
	gc->label);
	}
	}

	return 0;
	}

	static struct platform_driver etraxfs_gpio_driver = {
	.driver = {
	.name = "etraxfs-gpio",
	.of_match_table = of_match_ptr(etraxfs_gpio_of_table),
	},
	.probe = etraxfs_gpio_probe,
	};

	builtin_platform_driver(etraxfs_gpio_driver);