[linux.git] / drivers / gpio / gpio-xlp.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2003-2015 Broadcom Corporation
 * All Rights Reserved
 */

#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/module.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/acpi.h>

/*
 * XLP GPIO has multiple 32 bit registers for each feature where each register
 * controls 32 pins. So, pins up to 64 require 2 32-bit registers and up to 96
 * require 3 32-bit registers for each feature.
 * Here we only define offset of the first register for each feature. Offset of
 * the registers for pins greater than 32 can be calculated as following(Use
 * GPIO_INT_STAT as example):
 *
 * offset = (gpio / XLP_GPIO_REGSZ) * 4;
 * reg_addr = addr + offset;
 *
 * where addr is base address of the that feature register and gpio is the pin.
 */
#define GPIO_OUTPUT_EN		0x00
#define GPIO_PADDRV		0x08
#define GPIO_INT_EN00		0x18
#define GPIO_INT_EN10		0x20
#define GPIO_INT_EN20		0x28
#define GPIO_INT_EN30		0x30
#define GPIO_INT_POL		0x38
#define GPIO_INT_TYPE		0x40
#define GPIO_INT_STAT		0x48

#define GPIO_9XX_BYTESWAP	0X00
#define GPIO_9XX_CTRL		0X04
#define GPIO_9XX_OUTPUT_EN	0x14
#define GPIO_9XX_PADDRV		0x24
/*
 * Only for 4 interrupt enable reg are defined for now,
 * total reg available are 12.
 */
#define GPIO_9XX_INT_EN00	0x44
#define GPIO_9XX_INT_EN10	0x54
#define GPIO_9XX_INT_EN20	0x64
#define GPIO_9XX_INT_EN30	0x74
#define GPIO_9XX_INT_POL	0x104
#define GPIO_9XX_INT_TYPE	0x114
#define GPIO_9XX_INT_STAT	0x124

#define GPIO_3XX_INT_EN00	0x18
#define GPIO_3XX_INT_EN10	0x20
#define GPIO_3XX_INT_EN20	0x28
#define GPIO_3XX_INT_EN30	0x30
#define GPIO_3XX_INT_POL	0x78
#define GPIO_3XX_INT_TYPE	0x80
#define GPIO_3XX_INT_STAT	0x88

/* Interrupt type register mask */
#define XLP_GPIO_IRQ_TYPE_LVL	0x0
#define XLP_GPIO_IRQ_TYPE_EDGE	0x1

/* Interrupt polarity register mask */
#define XLP_GPIO_IRQ_POL_HIGH	0x0
#define XLP_GPIO_IRQ_POL_LOW	0x1

#define XLP_GPIO_REGSZ		32
#define XLP_GPIO_IRQ_BASE	768
#define XLP_MAX_NR_GPIO		96

/* XLP variants supported by this driver */
enum {
	XLP_GPIO_VARIANT_XLP832 = 1,
	XLP_GPIO_VARIANT_XLP316,
	XLP_GPIO_VARIANT_XLP208,
	XLP_GPIO_VARIANT_XLP980,
	XLP_GPIO_VARIANT_XLP532,
	GPIO_VARIANT_VULCAN
};

struct xlp_gpio_priv {
	struct gpio_chip chip;
	DECLARE_BITMAP(gpio_enabled_mask, XLP_MAX_NR_GPIO);
	void __iomem *gpio_intr_en;	/* pointer to first intr enable reg */
	void __iomem *gpio_intr_stat;	/* pointer to first intr status reg */
	void __iomem *gpio_intr_type;	/* pointer to first intr type reg */
	void __iomem *gpio_intr_pol;	/* pointer to first intr polarity reg */
	void __iomem *gpio_out_en;	/* pointer to first output enable reg */
	void __iomem *gpio_paddrv;	/* pointer to first pad drive reg */
	spinlock_t lock;
};

static int xlp_gpio_get_reg(void __iomem *addr, unsigned gpio)
{
	u32 pos, regset;

	pos = gpio % XLP_GPIO_REGSZ;
	regset = (gpio / XLP_GPIO_REGSZ) * 4;
	return !!(readl(addr + regset) & BIT(pos));
}

static void xlp_gpio_set_reg(void __iomem *addr, unsigned gpio, int state)
{
	u32 value, pos, regset;

	pos = gpio % XLP_GPIO_REGSZ;
	regset = (gpio / XLP_GPIO_REGSZ) * 4;
	value = readl(addr + regset);

	if (state)
		value |= BIT(pos);
	else
		value &= ~BIT(pos);

	writel(value, addr + regset);
}

static void xlp_gpio_irq_disable(struct irq_data *d)
{
	struct gpio_chip *gc  = irq_data_get_irq_chip_data(d);
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
	__clear_bit(d->hwirq, priv->gpio_enabled_mask);
	spin_unlock_irqrestore(&priv->lock, flags);
}

static void xlp_gpio_irq_mask_ack(struct irq_data *d)
{
	struct gpio_chip *gc  = irq_data_get_irq_chip_data(d);
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
	xlp_gpio_set_reg(priv->gpio_intr_stat, d->hwirq, 0x1);
	__clear_bit(d->hwirq, priv->gpio_enabled_mask);
	spin_unlock_irqrestore(&priv->lock, flags);
}

static void xlp_gpio_irq_unmask(struct irq_data *d)
{
	struct gpio_chip *gc  = irq_data_get_irq_chip_data(d);
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x1);
	__set_bit(d->hwirq, priv->gpio_enabled_mask);
	spin_unlock_irqrestore(&priv->lock, flags);
}

static int xlp_gpio_set_irq_type(struct irq_data *d, unsigned int type)
{
	struct gpio_chip *gc  = irq_data_get_irq_chip_data(d);
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
	int pol, irq_type;

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
		irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
		pol = XLP_GPIO_IRQ_POL_HIGH;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
		pol = XLP_GPIO_IRQ_POL_LOW;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		irq_type = XLP_GPIO_IRQ_TYPE_LVL;
		pol = XLP_GPIO_IRQ_POL_HIGH;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		irq_type = XLP_GPIO_IRQ_TYPE_LVL;
		pol = XLP_GPIO_IRQ_POL_LOW;
		break;
	default:
		return -EINVAL;
	}

	xlp_gpio_set_reg(priv->gpio_intr_type, d->hwirq, irq_type);
	xlp_gpio_set_reg(priv->gpio_intr_pol, d->hwirq, pol);

	return 0;
}

static struct irq_chip xlp_gpio_irq_chip = {
	.name		= "XLP-GPIO",
	.irq_mask_ack	= xlp_gpio_irq_mask_ack,
	.irq_disable	= xlp_gpio_irq_disable,
	.irq_set_type	= xlp_gpio_set_irq_type,
	.irq_unmask	= xlp_gpio_irq_unmask,
	.flags		= IRQCHIP_ONESHOT_SAFE,
};

static void xlp_gpio_generic_handler(struct irq_desc *desc)
{
	struct xlp_gpio_priv *priv = irq_desc_get_handler_data(desc);
	struct irq_chip *irqchip = irq_desc_get_chip(desc);
	int gpio, regoff;
	u32 gpio_stat;

	regoff = -1;
	gpio_stat = 0;

	chained_irq_enter(irqchip, desc);
	for_each_set_bit(gpio, priv->gpio_enabled_mask, XLP_MAX_NR_GPIO) {
		if (regoff != gpio / XLP_GPIO_REGSZ) {
			regoff = gpio / XLP_GPIO_REGSZ;
			gpio_stat = readl(priv->gpio_intr_stat + regoff * 4);
		}

		if (gpio_stat & BIT(gpio % XLP_GPIO_REGSZ))
			generic_handle_irq(irq_find_mapping(
						priv->chip.irq.domain, gpio));
	}
	chained_irq_exit(irqchip, desc);
}

static int xlp_gpio_dir_output(struct gpio_chip *gc, unsigned gpio, int state)
{
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

	BUG_ON(gpio >= gc->ngpio);
	xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x1);

	return 0;
}

static int xlp_gpio_dir_input(struct gpio_chip *gc, unsigned gpio)
{
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

	BUG_ON(gpio >= gc->ngpio);
	xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x0);

	return 0;
}

static int xlp_gpio_get(struct gpio_chip *gc, unsigned gpio)
{
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

	BUG_ON(gpio >= gc->ngpio);
	return xlp_gpio_get_reg(priv->gpio_paddrv, gpio);
}

static void xlp_gpio_set(struct gpio_chip *gc, unsigned gpio, int state)
{
	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);

	BUG_ON(gpio >= gc->ngpio);
	xlp_gpio_set_reg(priv->gpio_paddrv, gpio, state);
}

static const struct of_device_id xlp_gpio_of_ids[] = {
	{
		.compatible = "netlogic,xlp832-gpio",
		.data	    = (void *)XLP_GPIO_VARIANT_XLP832,
	},
	{
		.compatible = "netlogic,xlp316-gpio",
		.data	    = (void *)XLP_GPIO_VARIANT_XLP316,
	},
	{
		.compatible = "netlogic,xlp208-gpio",
		.data	    = (void *)XLP_GPIO_VARIANT_XLP208,
	},
	{
		.compatible = "netlogic,xlp980-gpio",
		.data	    = (void *)XLP_GPIO_VARIANT_XLP980,
	},
	{
		.compatible = "netlogic,xlp532-gpio",
		.data	    = (void *)XLP_GPIO_VARIANT_XLP532,
	},
	{
		.compatible = "brcm,vulcan-gpio",
		.data	    = (void *)GPIO_VARIANT_VULCAN,
	},
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, xlp_gpio_of_ids);

static int xlp_gpio_probe(struct platform_device *pdev)
{
	struct gpio_chip *gc;
	struct resource *iores;
	struct xlp_gpio_priv *priv;
	void __iomem *gpio_base;
	int irq_base, irq, err;
	int ngpio;
	u32 soc_type;

	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iores)
		return -ENODEV;

	priv = devm_kzalloc(&pdev->dev,	sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	gpio_base = devm_ioremap_resource(&pdev->dev, iores);
	if (IS_ERR(gpio_base))
		return PTR_ERR(gpio_base);

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	if (pdev->dev.of_node) {
		soc_type = (uintptr_t)of_device_get_match_data(&pdev->dev);
	} else {
		const struct acpi_device_id *acpi_id;

		acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
						&pdev->dev);
		if (!acpi_id || !acpi_id->driver_data) {
			dev_err(&pdev->dev, "Unable to match ACPI ID\n");
			return -ENODEV;
		}
		soc_type = (uintptr_t) acpi_id->driver_data;
	}

	switch (soc_type) {
	case XLP_GPIO_VARIANT_XLP832:
		priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
		priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
		priv->gpio_intr_stat = gpio_base + GPIO_INT_STAT;
		priv->gpio_intr_type = gpio_base + GPIO_INT_TYPE;
		priv->gpio_intr_pol = gpio_base + GPIO_INT_POL;
		priv->gpio_intr_en = gpio_base + GPIO_INT_EN00;
		ngpio = 41;
		break;
	case XLP_GPIO_VARIANT_XLP208:
	case XLP_GPIO_VARIANT_XLP316:
		priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
		priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
		priv->gpio_intr_stat = gpio_base + GPIO_3XX_INT_STAT;
		priv->gpio_intr_type = gpio_base + GPIO_3XX_INT_TYPE;
		priv->gpio_intr_pol = gpio_base + GPIO_3XX_INT_POL;
		priv->gpio_intr_en = gpio_base + GPIO_3XX_INT_EN00;

		ngpio = (soc_type == XLP_GPIO_VARIANT_XLP208) ? 42 : 57;
		break;
	case XLP_GPIO_VARIANT_XLP980:
	case XLP_GPIO_VARIANT_XLP532:
	case GPIO_VARIANT_VULCAN:
		priv->gpio_out_en = gpio_base + GPIO_9XX_OUTPUT_EN;
		priv->gpio_paddrv = gpio_base + GPIO_9XX_PADDRV;
		priv->gpio_intr_stat = gpio_base + GPIO_9XX_INT_STAT;
		priv->gpio_intr_type = gpio_base + GPIO_9XX_INT_TYPE;
		priv->gpio_intr_pol = gpio_base + GPIO_9XX_INT_POL;
		priv->gpio_intr_en = gpio_base + GPIO_9XX_INT_EN00;

		if (soc_type == XLP_GPIO_VARIANT_XLP980)
			ngpio = 66;
		else if (soc_type == XLP_GPIO_VARIANT_XLP532)
			ngpio = 67;
		else
			ngpio = 70;
		break;
	default:
		dev_err(&pdev->dev, "Unknown Processor type!\n");
		return -ENODEV;
	}

	bitmap_zero(priv->gpio_enabled_mask, XLP_MAX_NR_GPIO);

	gc = &priv->chip;

	gc->owner = THIS_MODULE;
	gc->label = dev_name(&pdev->dev);
	gc->base = 0;
	gc->parent = &pdev->dev;
	gc->ngpio = ngpio;
	gc->of_node = pdev->dev.of_node;
	gc->direction_output = xlp_gpio_dir_output;
	gc->direction_input = xlp_gpio_dir_input;
	gc->set = xlp_gpio_set;
	gc->get = xlp_gpio_get;

	spin_lock_init(&priv->lock);

	/* XLP(MIPS) has fixed range for GPIO IRQs, Vulcan(ARM64) does not */
	if (soc_type != GPIO_VARIANT_VULCAN) {
		irq_base = devm_irq_alloc_descs(&pdev->dev, -1,
						XLP_GPIO_IRQ_BASE,
						gc->ngpio, 0);
		if (irq_base < 0) {
			dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
			return irq_base;
		}
	} else {
		irq_base = 0;
	}

	err = gpiochip_add_data(gc, priv);
	if (err < 0)
		return err;

	err = gpiochip_irqchip_add(gc, &xlp_gpio_irq_chip, irq_base,
				handle_level_irq, IRQ_TYPE_NONE);
	if (err) {
		dev_err(&pdev->dev, "Could not connect irqchip to gpiochip!\n");
		goto out_gpio_remove;
	}

	gpiochip_set_chained_irqchip(gc, &xlp_gpio_irq_chip, irq,
			xlp_gpio_generic_handler);

	dev_info(&pdev->dev, "registered %d GPIOs\n", gc->ngpio);

	return 0;

out_gpio_remove:
	gpiochip_remove(gc);
	return err;
}

#ifdef CONFIG_ACPI
static const struct acpi_device_id xlp_gpio_acpi_match[] = {
	{ "BRCM9006", GPIO_VARIANT_VULCAN },
	{ "CAV9006",  GPIO_VARIANT_VULCAN },
	{},
};
MODULE_DEVICE_TABLE(acpi, xlp_gpio_acpi_match);
#endif

static struct platform_driver xlp_gpio_driver = {
	.driver		= {
		.name	= "xlp-gpio",
		.of_match_table = xlp_gpio_of_ids,
		.acpi_match_table = ACPI_PTR(xlp_gpio_acpi_match),
	},
	.probe		= xlp_gpio_probe,
};
module_platform_driver(xlp_gpio_driver);

MODULE_AUTHOR("Kamlakant Patel <[email protected]>");
MODULE_AUTHOR("Ganesan Ramalingam <[email protected]>");
MODULE_DESCRIPTION("Netlogic XLP GPIO Driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
130a990b	1	// SPDX-License-Identifier: GPL-2.0
ff718800 KP	2	/*
	3	* Copyright (C) 2003-2015 Broadcom Corporation
	4	* All Rights Reserved
ff718800 KP	5	*/
ff718800 KP	6
121111d7	7	#include <linux/gpio/driver.h>
ff718800 KP	8	#include <linux/platform_device.h>
	9	#include <linux/of_device.h>
	10	#include <linux/module.h>
	11	#include <linux/irq.h>
	12	#include <linux/interrupt.h>
83ea24fd	13	#include <linux/irqchip/chained_irq.h>
baa1b920	14	#include <linux/acpi.h>
ff718800 KP	15
	16	/*
	17	* XLP GPIO has multiple 32 bit registers for each feature where each register
	18	* controls 32 pins. So, pins up to 64 require 2 32-bit registers and up to 96
	19	* require 3 32-bit registers for each feature.
	20	* Here we only define offset of the first register for each feature. Offset of
	21	* the registers for pins greater than 32 can be calculated as following(Use
	22	* GPIO_INT_STAT as example):
	23	*
	24	* offset = (gpio / XLP_GPIO_REGSZ) * 4;
	25	* reg_addr = addr + offset;
	26	*
	27	* where addr is base address of the that feature register and gpio is the pin.
	28	*/
	29	#define GPIO_OUTPUT_EN 0x00
	30	#define GPIO_PADDRV 0x08
	31	#define GPIO_INT_EN00 0x18
	32	#define GPIO_INT_EN10 0x20
	33	#define GPIO_INT_EN20 0x28
	34	#define GPIO_INT_EN30 0x30
	35	#define GPIO_INT_POL 0x38
	36	#define GPIO_INT_TYPE 0x40
	37	#define GPIO_INT_STAT 0x48
	38
	39	#define GPIO_9XX_BYTESWAP 0X00
	40	#define GPIO_9XX_CTRL 0X04
	41	#define GPIO_9XX_OUTPUT_EN 0x14
	42	#define GPIO_9XX_PADDRV 0x24
	43	/*
	44	* Only for 4 interrupt enable reg are defined for now,
	45	* total reg available are 12.
	46	*/
	47	#define GPIO_9XX_INT_EN00 0x44
	48	#define GPIO_9XX_INT_EN10 0x54
	49	#define GPIO_9XX_INT_EN20 0x64
	50	#define GPIO_9XX_INT_EN30 0x74
	51	#define GPIO_9XX_INT_POL 0x104
	52	#define GPIO_9XX_INT_TYPE 0x114
	53	#define GPIO_9XX_INT_STAT 0x124
	54
	55	#define GPIO_3XX_INT_EN00 0x18
	56	#define GPIO_3XX_INT_EN10 0x20
	57	#define GPIO_3XX_INT_EN20 0x28
	58	#define GPIO_3XX_INT_EN30 0x30
	59	#define GPIO_3XX_INT_POL 0x78
	60	#define GPIO_3XX_INT_TYPE 0x80
	61	#define GPIO_3XX_INT_STAT 0x88
	62
	63	/* Interrupt type register mask */
	64	#define XLP_GPIO_IRQ_TYPE_LVL 0x0
	65	#define XLP_GPIO_IRQ_TYPE_EDGE 0x1
	66
	67	/* Interrupt polarity register mask */
	68	#define XLP_GPIO_IRQ_POL_HIGH 0x0
	69	#define XLP_GPIO_IRQ_POL_LOW 0x1
	70
	71	#define XLP_GPIO_REGSZ 32
	72	#define XLP_GPIO_IRQ_BASE 768
	73	#define XLP_MAX_NR_GPIO 96
	74
	75	/* XLP variants supported by this driver */
	76	enum {
	77	XLP_GPIO_VARIANT_XLP832 = 1,
	78	XLP_GPIO_VARIANT_XLP316,
79	XLP_GPIO_VARIANT_XLP208,
80	XLP_GPIO_VARIANT_XLP980,
dd98756d KP	81	XLP_GPIO_VARIANT_XLP532,
dd98756d KP	82	GPIO_VARIANT_VULCAN
ff718800 KP	83	};
	84
	85	struct xlp_gpio_priv {
	86	struct gpio_chip chip;
	87	DECLARE_BITMAP(gpio_enabled_mask, XLP_MAX_NR_GPIO);
	88	void __iomem gpio_intr_en; / pointer to first intr enable reg */
	89	void __iomem gpio_intr_stat; / pointer to first intr status reg */
	90	void __iomem gpio_intr_type; / pointer to first intr type reg */
	91	void __iomem gpio_intr_pol; / pointer to first intr polarity reg */
	92	void __iomem gpio_out_en; / pointer to first output enable reg */
	93	void __iomem gpio_paddrv; / pointer to first pad drive reg */
	94	spinlock_t lock;
	95	};
	96
ff718800 KP	97	static int xlp_gpio_get_reg(void __iomem *addr, unsigned gpio)
	98	{
	99	u32 pos, regset;
	100
	101	pos = gpio % XLP_GPIO_REGSZ;
	102	regset = (gpio / XLP_GPIO_REGSZ) * 4;
	103	return !!(readl(addr + regset) & BIT(pos));
	104	}
	105
	106	static void xlp_gpio_set_reg(void __iomem *addr, unsigned gpio, int state)
	107	{
	108	u32 value, pos, regset;
	109
	110	pos = gpio % XLP_GPIO_REGSZ;
	111	regset = (gpio / XLP_GPIO_REGSZ) * 4;
	112	value = readl(addr + regset);
	113
	114	if (state)
	115	value \|= BIT(pos);
	116	else
	117	value &= ~BIT(pos);
	118
	119	writel(value, addr + regset);
	120	}
	121
	122	static void xlp_gpio_irq_disable(struct irq_data *d)
	123	{
	124	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
e730a595	125	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	126	unsigned long flags;
	127
	128	spin_lock_irqsave(&priv->lock, flags);
	129	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
	130	__clear_bit(d->hwirq, priv->gpio_enabled_mask);
	131	spin_unlock_irqrestore(&priv->lock, flags);
	132	}
	133
	134	static void xlp_gpio_irq_mask_ack(struct irq_data *d)
	135	{
	136	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
e730a595	137	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	138	unsigned long flags;
	139
	140	spin_lock_irqsave(&priv->lock, flags);
	141	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
	142	xlp_gpio_set_reg(priv->gpio_intr_stat, d->hwirq, 0x1);
	143	__clear_bit(d->hwirq, priv->gpio_enabled_mask);
	144	spin_unlock_irqrestore(&priv->lock, flags);
	145	}
	146
	147	static void xlp_gpio_irq_unmask(struct irq_data *d)
	148	{
	149	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
e730a595	150	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	151	unsigned long flags;
	152
	153	spin_lock_irqsave(&priv->lock, flags);
	154	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x1);
	155	__set_bit(d->hwirq, priv->gpio_enabled_mask);
	156	spin_unlock_irqrestore(&priv->lock, flags);
	157	}
	158
	159	static int xlp_gpio_set_irq_type(struct irq_data *d, unsigned int type)
	160	{
	161	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
e730a595	162	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	163	int pol, irq_type;
	164
	165	switch (type) {
	166	case IRQ_TYPE_EDGE_RISING:
	167	irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
	168	pol = XLP_GPIO_IRQ_POL_HIGH;
	169	break;
	170	case IRQ_TYPE_EDGE_FALLING:
	171	irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
	172	pol = XLP_GPIO_IRQ_POL_LOW;
	173	break;
	174	case IRQ_TYPE_LEVEL_HIGH:
	175	irq_type = XLP_GPIO_IRQ_TYPE_LVL;
	176	pol = XLP_GPIO_IRQ_POL_HIGH;
	177	break;
	178	case IRQ_TYPE_LEVEL_LOW:
	179	irq_type = XLP_GPIO_IRQ_TYPE_LVL;
	180	pol = XLP_GPIO_IRQ_POL_LOW;
	181	break;
	182	default:
	183	return -EINVAL;
	184	}
	185
	186	xlp_gpio_set_reg(priv->gpio_intr_type, d->hwirq, irq_type);
	187	xlp_gpio_set_reg(priv->gpio_intr_pol, d->hwirq, pol);
	188
	189	return 0;
	190	}
	191
	192	static struct irq_chip xlp_gpio_irq_chip = {
	193	.name = "XLP-GPIO",
	194	.irq_mask_ack = xlp_gpio_irq_mask_ack,
	195	.irq_disable = xlp_gpio_irq_disable,
	196	.irq_set_type = xlp_gpio_set_irq_type,
	197	.irq_unmask = xlp_gpio_irq_unmask,
	198	.flags = IRQCHIP_ONESHOT_SAFE,
	199	};
	200
83ea24fd	201	static void xlp_gpio_generic_handler(struct irq_desc *desc)
ff718800	202	{
83ea24fd KP	203	struct xlp_gpio_priv *priv = irq_desc_get_handler_data(desc);
83ea24fd KP	204	struct irq_chip *irqchip = irq_desc_get_chip(desc);
ff718800 KP	205	int gpio, regoff;
	206	u32 gpio_stat;
	207
	208	regoff = -1;
	209	gpio_stat = 0;
83ea24fd KP	210
83ea24fd KP	211	chained_irq_enter(irqchip, desc);
ff718800 KP	212	for_each_set_bit(gpio, priv->gpio_enabled_mask, XLP_MAX_NR_GPIO) {
	213	if (regoff != gpio / XLP_GPIO_REGSZ) {
	214	regoff = gpio / XLP_GPIO_REGSZ;
	215	gpio_stat = readl(priv->gpio_intr_stat + regoff * 4);
	216	}
83ea24fd	217
ff718800 KP	218	if (gpio_stat & BIT(gpio % XLP_GPIO_REGSZ))
ff718800 KP	219	generic_handle_irq(irq_find_mapping(
f0fbe7bc	220	priv->chip.irq.domain, gpio));
ff718800	221	}
83ea24fd	222	chained_irq_exit(irqchip, desc);
ff718800 KP	223	}
	224
	225	static int xlp_gpio_dir_output(struct gpio_chip *gc, unsigned gpio, int state)
	226	{
e730a595	227	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	228
	229	BUG_ON(gpio >= gc->ngpio);
	230	xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x1);
	231
	232	return 0;
	233	}
	234
	235	static int xlp_gpio_dir_input(struct gpio_chip *gc, unsigned gpio)
	236	{
e730a595	237	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	238
	239	BUG_ON(gpio >= gc->ngpio);
	240	xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x0);
	241
	242	return 0;
	243	}
	244
	245	static int xlp_gpio_get(struct gpio_chip *gc, unsigned gpio)
	246	{
e730a595	247	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	248
	249	BUG_ON(gpio >= gc->ngpio);
	250	return xlp_gpio_get_reg(priv->gpio_paddrv, gpio);
	251	}
	252
	253	static void xlp_gpio_set(struct gpio_chip *gc, unsigned gpio, int state)
	254	{
e730a595	255	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	256
	257	BUG_ON(gpio >= gc->ngpio);
	258	xlp_gpio_set_reg(priv->gpio_paddrv, gpio, state);
	259	}
	260
	261	static const struct of_device_id xlp_gpio_of_ids[] = {
	262	{
	263	.compatible = "netlogic,xlp832-gpio",
	264	.data = (void *)XLP_GPIO_VARIANT_XLP832,
	265	},
	266	{
	267	.compatible = "netlogic,xlp316-gpio",
	268	.data = (void *)XLP_GPIO_VARIANT_XLP316,
	269	},
	270	{
	271	.compatible = "netlogic,xlp208-gpio",
	272	.data = (void *)XLP_GPIO_VARIANT_XLP208,
	273	},
	274	{
	275	.compatible = "netlogic,xlp980-gpio",
	276	.data = (void *)XLP_GPIO_VARIANT_XLP980,
	277	},
	278	{
	279	.compatible = "netlogic,xlp532-gpio",
	280	.data = (void *)XLP_GPIO_VARIANT_XLP532,
	281	},
dd98756d KP	282	{
	283	.compatible = "brcm,vulcan-gpio",
	284	.data = (void *)GPIO_VARIANT_VULCAN,
	285	},
ff718800 KP	286	{ /* sentinel */ },
	287	};
	288	MODULE_DEVICE_TABLE(of, xlp_gpio_of_ids);
	289
	290	static int xlp_gpio_probe(struct platform_device *pdev)
	291	{
	292	struct gpio_chip *gc;
	293	struct resource *iores;
	294	struct xlp_gpio_priv *priv;
ff718800 KP	295	void __iomem *gpio_base;
	296	int irq_base, irq, err;
	297	int ngpio;
	298	u32 soc_type;
	299
	300	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	301	if (!iores)
	302	return -ENODEV;
	303
	304	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	305	if (!priv)
	306	return -ENOMEM;
	307
	308	gpio_base = devm_ioremap_resource(&pdev->dev, iores);
	309	if (IS_ERR(gpio_base))
	310	return PTR_ERR(gpio_base);
	311
	312	irq = platform_get_irq(pdev, 0);
	313	if (irq < 0)
	314	return irq;
	315
baa1b920	316	if (pdev->dev.of_node) {
0c695e38	317	soc_type = (uintptr_t)of_device_get_match_data(&pdev->dev);
baa1b920 KP	318	} else {
	319	const struct acpi_device_id *acpi_id;
	320
	321	acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
	322	&pdev->dev);
	323	if (!acpi_id \|\| !acpi_id->driver_data) {
	324	dev_err(&pdev->dev, "Unable to match ACPI ID\n");
	325	return -ENODEV;
	326	}
	327	soc_type = (uintptr_t) acpi_id->driver_data;
	328	}
ff718800 KP	329
	330	switch (soc_type) {
	331	case XLP_GPIO_VARIANT_XLP832:
	332	priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
	333	priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
	334	priv->gpio_intr_stat = gpio_base + GPIO_INT_STAT;
	335	priv->gpio_intr_type = gpio_base + GPIO_INT_TYPE;
	336	priv->gpio_intr_pol = gpio_base + GPIO_INT_POL;
	337	priv->gpio_intr_en = gpio_base + GPIO_INT_EN00;
	338	ngpio = 41;
	339	break;
	340	case XLP_GPIO_VARIANT_XLP208:
	341	case XLP_GPIO_VARIANT_XLP316:
	342	priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
	343	priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
	344	priv->gpio_intr_stat = gpio_base + GPIO_3XX_INT_STAT;
	345	priv->gpio_intr_type = gpio_base + GPIO_3XX_INT_TYPE;
	346	priv->gpio_intr_pol = gpio_base + GPIO_3XX_INT_POL;
	347	priv->gpio_intr_en = gpio_base + GPIO_3XX_INT_EN00;
	348
	349	ngpio = (soc_type == XLP_GPIO_VARIANT_XLP208) ? 42 : 57;
	350	break;
	351	case XLP_GPIO_VARIANT_XLP980:
	352	case XLP_GPIO_VARIANT_XLP532:
dd98756d	353	case GPIO_VARIANT_VULCAN:
ff718800 KP	354	priv->gpio_out_en = gpio_base + GPIO_9XX_OUTPUT_EN;
	355	priv->gpio_paddrv = gpio_base + GPIO_9XX_PADDRV;
	356	priv->gpio_intr_stat = gpio_base + GPIO_9XX_INT_STAT;
	357	priv->gpio_intr_type = gpio_base + GPIO_9XX_INT_TYPE;
	358	priv->gpio_intr_pol = gpio_base + GPIO_9XX_INT_POL;
	359	priv->gpio_intr_en = gpio_base + GPIO_9XX_INT_EN00;
	360
dd98756d KP	361	if (soc_type == XLP_GPIO_VARIANT_XLP980)
	362	ngpio = 66;
	363	else if (soc_type == XLP_GPIO_VARIANT_XLP532)
	364	ngpio = 67;
	365	else
	366	ngpio = 70;
ff718800 KP	367	break;
	368	default:
	369	dev_err(&pdev->dev, "Unknown Processor type!\n");
	370	return -ENODEV;
	371	}
	372
	373	bitmap_zero(priv->gpio_enabled_mask, XLP_MAX_NR_GPIO);
	374
	375	gc = &priv->chip;
	376
b8a3f52e AL	377	gc->owner = THIS_MODULE;
b8a3f52e AL	378	gc->label = dev_name(&pdev->dev);
ff718800	379	gc->base = 0;
58383c78	380	gc->parent = &pdev->dev;
ff718800 KP	381	gc->ngpio = ngpio;
	382	gc->of_node = pdev->dev.of_node;
	383	gc->direction_output = xlp_gpio_dir_output;
	384	gc->direction_input = xlp_gpio_dir_input;
	385	gc->set = xlp_gpio_set;
	386	gc->get = xlp_gpio_get;
	387
	388	spin_lock_init(&priv->lock);
1630a062 KP	389
	390	/* XLP(MIPS) has fixed range for GPIO IRQs, Vulcan(ARM64) does not */
	391	if (soc_type != GPIO_VARIANT_VULCAN) {
31bd86d9 BG	392	irq_base = devm_irq_alloc_descs(&pdev->dev, -1,
	393	XLP_GPIO_IRQ_BASE,
	394	gc->ngpio, 0);
1630a062 KP	395	if (irq_base < 0) {
	396	dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
	397	return irq_base;
	398	}
	399	} else {
	400	irq_base = 0;
ff718800 KP	401	}
ff718800 KP	402
e730a595	403	err = gpiochip_add_data(gc, priv);
ff718800	404	if (err < 0)
31bd86d9	405	return err;
ff718800 KP	406
	407	err = gpiochip_irqchip_add(gc, &xlp_gpio_irq_chip, irq_base,
	408	handle_level_irq, IRQ_TYPE_NONE);
	409	if (err) {
	410	dev_err(&pdev->dev, "Could not connect irqchip to gpiochip!\n");
	411	goto out_gpio_remove;
	412	}
	413
83ea24fd KP	414	gpiochip_set_chained_irqchip(gc, &xlp_gpio_irq_chip, irq,
	415	xlp_gpio_generic_handler);
	416
ff718800 KP	417	dev_info(&pdev->dev, "registered %d GPIOs\n", gc->ngpio);
	418
	419	return 0;
	420
	421	out_gpio_remove:
	422	gpiochip_remove(gc);
ff718800 KP	423	return err;
	424	}
	425
baa1b920 KP	426	#ifdef CONFIG_ACPI
	427	static const struct acpi_device_id xlp_gpio_acpi_match[] = {
	428	{ "BRCM9006", GPIO_VARIANT_VULCAN },
529f75d8	429	{ "CAV9006", GPIO_VARIANT_VULCAN },
baa1b920 KP	430	{},
	431	};
	432	MODULE_DEVICE_TABLE(acpi, xlp_gpio_acpi_match);
	433	#endif
	434
ff718800 KP	435	static struct platform_driver xlp_gpio_driver = {
	436	.driver = {
	437	.name = "xlp-gpio",
	438	.of_match_table = xlp_gpio_of_ids,
baa1b920	439	.acpi_match_table = ACPI_PTR(xlp_gpio_acpi_match),
ff718800 KP	440	},
	441	.probe = xlp_gpio_probe,
	442	};
	443	module_platform_driver(xlp_gpio_driver);
	444
	445	MODULE_AUTHOR("Kamlakant Patel <[email protected]>");
	446	MODULE_AUTHOR("Ganesan Ramalingam <[email protected]>");
	447	MODULE_DESCRIPTION("Netlogic XLP GPIO Driver");
	448	MODULE_LICENSE("GPL v2");