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

/*
 * Copyright (C) 2003-2015 Broadcom Corporation
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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/gpio.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>

/*
 * 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.irqdomain, 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;
	const struct of_device_id *of_id;
	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;

	of_id = of_match_device(xlp_gpio_of_ids, &pdev->dev);
	if (!of_id) {
		dev_err(&pdev->dev, "Failed to get soc type!\n");
		return -ENODEV;
	}

	soc_type = (uintptr_t) of_id->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 has fixed IRQ range for GPIO interrupts */
	if (soc_type == GPIO_VARIANT_VULCAN)
		irq_base = irq_alloc_descs(-1, 0, gc->ngpio, 0);
	else
		irq_base = irq_alloc_descs(-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;
	}

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

	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);
out_free_desc:
	irq_free_descs(irq_base, gc->ngpio);
	return err;
}

static struct platform_driver xlp_gpio_driver = {
	.driver		= {
		.name	= "xlp-gpio",
		.of_match_table = xlp_gpio_of_ids,
	},
	.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
ff718800 KP	1	/*
	2	* Copyright (C) 2003-2015 Broadcom Corporation
	3	* All Rights Reserved
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*/
	14
	15	#include <linux/gpio.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/of_device.h>
	18	#include <linux/module.h>
	19	#include <linux/irq.h>
	20	#include <linux/interrupt.h>
83ea24fd	21	#include <linux/irqchip/chained_irq.h>
ff718800 KP	22
	23	/*
	24	* XLP GPIO has multiple 32 bit registers for each feature where each register
	25	* controls 32 pins. So, pins up to 64 require 2 32-bit registers and up to 96
	26	* require 3 32-bit registers for each feature.
	27	* Here we only define offset of the first register for each feature. Offset of
	28	* the registers for pins greater than 32 can be calculated as following(Use
	29	* GPIO_INT_STAT as example):
	30	*
	31	* offset = (gpio / XLP_GPIO_REGSZ) * 4;
	32	* reg_addr = addr + offset;
	33	*
	34	* where addr is base address of the that feature register and gpio is the pin.
	35	*/
	36	#define GPIO_OUTPUT_EN 0x00
	37	#define GPIO_PADDRV 0x08
	38	#define GPIO_INT_EN00 0x18
	39	#define GPIO_INT_EN10 0x20
	40	#define GPIO_INT_EN20 0x28
	41	#define GPIO_INT_EN30 0x30
	42	#define GPIO_INT_POL 0x38
	43	#define GPIO_INT_TYPE 0x40
	44	#define GPIO_INT_STAT 0x48
	45
	46	#define GPIO_9XX_BYTESWAP 0X00
	47	#define GPIO_9XX_CTRL 0X04
	48	#define GPIO_9XX_OUTPUT_EN 0x14
	49	#define GPIO_9XX_PADDRV 0x24
	50	/*
	51	* Only for 4 interrupt enable reg are defined for now,
	52	* total reg available are 12.
	53	*/
	54	#define GPIO_9XX_INT_EN00 0x44
	55	#define GPIO_9XX_INT_EN10 0x54
	56	#define GPIO_9XX_INT_EN20 0x64
	57	#define GPIO_9XX_INT_EN30 0x74
	58	#define GPIO_9XX_INT_POL 0x104
	59	#define GPIO_9XX_INT_TYPE 0x114
	60	#define GPIO_9XX_INT_STAT 0x124
	61
	62	#define GPIO_3XX_INT_EN00 0x18
	63	#define GPIO_3XX_INT_EN10 0x20
	64	#define GPIO_3XX_INT_EN20 0x28
	65	#define GPIO_3XX_INT_EN30 0x30
	66	#define GPIO_3XX_INT_POL 0x78
	67	#define GPIO_3XX_INT_TYPE 0x80
	68	#define GPIO_3XX_INT_STAT 0x88
	69
	70	/* Interrupt type register mask */
	71	#define XLP_GPIO_IRQ_TYPE_LVL 0x0
	72	#define XLP_GPIO_IRQ_TYPE_EDGE 0x1
	73
	74	/* Interrupt polarity register mask */
	75	#define XLP_GPIO_IRQ_POL_HIGH 0x0
	76	#define XLP_GPIO_IRQ_POL_LOW 0x1
	77
	78	#define XLP_GPIO_REGSZ 32
	79	#define XLP_GPIO_IRQ_BASE 768
	80	#define XLP_MAX_NR_GPIO 96
	81
	82	/* XLP variants supported by this driver */
	83	enum {
	84	XLP_GPIO_VARIANT_XLP832 = 1,
	85	XLP_GPIO_VARIANT_XLP316,
86	XLP_GPIO_VARIANT_XLP208,
87	XLP_GPIO_VARIANT_XLP980,
dd98756d KP	88	XLP_GPIO_VARIANT_XLP532,
dd98756d KP	89	GPIO_VARIANT_VULCAN
ff718800 KP	90	};
	91
	92	struct xlp_gpio_priv {
	93	struct gpio_chip chip;
	94	DECLARE_BITMAP(gpio_enabled_mask, XLP_MAX_NR_GPIO);
	95	void __iomem gpio_intr_en; / pointer to first intr enable reg */
	96	void __iomem gpio_intr_stat; / pointer to first intr status reg */
	97	void __iomem gpio_intr_type; / pointer to first intr type reg */
	98	void __iomem gpio_intr_pol; / pointer to first intr polarity reg */
	99	void __iomem gpio_out_en; / pointer to first output enable reg */
	100	void __iomem gpio_paddrv; / pointer to first pad drive reg */
	101	spinlock_t lock;
	102	};
	103
ff718800 KP	104	static int xlp_gpio_get_reg(void __iomem *addr, unsigned gpio)
	105	{
	106	u32 pos, regset;
	107
	108	pos = gpio % XLP_GPIO_REGSZ;
	109	regset = (gpio / XLP_GPIO_REGSZ) * 4;
	110	return !!(readl(addr + regset) & BIT(pos));
	111	}
	112
	113	static void xlp_gpio_set_reg(void __iomem *addr, unsigned gpio, int state)
	114	{
	115	u32 value, pos, regset;
	116
	117	pos = gpio % XLP_GPIO_REGSZ;
	118	regset = (gpio / XLP_GPIO_REGSZ) * 4;
	119	value = readl(addr + regset);
	120
	121	if (state)
	122	value \|= BIT(pos);
	123	else
	124	value &= ~BIT(pos);
	125
	126	writel(value, addr + regset);
	127	}
	128
	129	static void xlp_gpio_irq_disable(struct irq_data *d)
	130	{
	131	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
e730a595	132	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	133	unsigned long flags;
	134
	135	spin_lock_irqsave(&priv->lock, flags);
	136	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
	137	__clear_bit(d->hwirq, priv->gpio_enabled_mask);
	138	spin_unlock_irqrestore(&priv->lock, flags);
	139	}
	140
	141	static void xlp_gpio_irq_mask_ack(struct irq_data *d)
	142	{
	143	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
e730a595	144	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	145	unsigned long flags;
	146
	147	spin_lock_irqsave(&priv->lock, flags);
	148	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x0);
	149	xlp_gpio_set_reg(priv->gpio_intr_stat, d->hwirq, 0x1);
	150	__clear_bit(d->hwirq, priv->gpio_enabled_mask);
	151	spin_unlock_irqrestore(&priv->lock, flags);
	152	}
	153
	154	static void xlp_gpio_irq_unmask(struct irq_data *d)
	155	{
	156	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
e730a595	157	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	158	unsigned long flags;
	159
	160	spin_lock_irqsave(&priv->lock, flags);
	161	xlp_gpio_set_reg(priv->gpio_intr_en, d->hwirq, 0x1);
	162	__set_bit(d->hwirq, priv->gpio_enabled_mask);
	163	spin_unlock_irqrestore(&priv->lock, flags);
	164	}
	165
	166	static int xlp_gpio_set_irq_type(struct irq_data *d, unsigned int type)
	167	{
	168	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
e730a595	169	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	170	int pol, irq_type;
	171
	172	switch (type) {
	173	case IRQ_TYPE_EDGE_RISING:
	174	irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
	175	pol = XLP_GPIO_IRQ_POL_HIGH;
	176	break;
	177	case IRQ_TYPE_EDGE_FALLING:
	178	irq_type = XLP_GPIO_IRQ_TYPE_EDGE;
	179	pol = XLP_GPIO_IRQ_POL_LOW;
	180	break;
	181	case IRQ_TYPE_LEVEL_HIGH:
	182	irq_type = XLP_GPIO_IRQ_TYPE_LVL;
	183	pol = XLP_GPIO_IRQ_POL_HIGH;
	184	break;
	185	case IRQ_TYPE_LEVEL_LOW:
	186	irq_type = XLP_GPIO_IRQ_TYPE_LVL;
	187	pol = XLP_GPIO_IRQ_POL_LOW;
	188	break;
	189	default:
	190	return -EINVAL;
	191	}
	192
	193	xlp_gpio_set_reg(priv->gpio_intr_type, d->hwirq, irq_type);
	194	xlp_gpio_set_reg(priv->gpio_intr_pol, d->hwirq, pol);
	195
	196	return 0;
	197	}
	198
	199	static struct irq_chip xlp_gpio_irq_chip = {
	200	.name = "XLP-GPIO",
	201	.irq_mask_ack = xlp_gpio_irq_mask_ack,
	202	.irq_disable = xlp_gpio_irq_disable,
	203	.irq_set_type = xlp_gpio_set_irq_type,
	204	.irq_unmask = xlp_gpio_irq_unmask,
	205	.flags = IRQCHIP_ONESHOT_SAFE,
	206	};
	207
83ea24fd	208	static void xlp_gpio_generic_handler(struct irq_desc *desc)
ff718800	209	{
83ea24fd KP	210	struct xlp_gpio_priv *priv = irq_desc_get_handler_data(desc);
83ea24fd KP	211	struct irq_chip *irqchip = irq_desc_get_chip(desc);
ff718800 KP	212	int gpio, regoff;
	213	u32 gpio_stat;
	214
	215	regoff = -1;
	216	gpio_stat = 0;
83ea24fd KP	217
83ea24fd KP	218	chained_irq_enter(irqchip, desc);
ff718800 KP	219	for_each_set_bit(gpio, priv->gpio_enabled_mask, XLP_MAX_NR_GPIO) {
	220	if (regoff != gpio / XLP_GPIO_REGSZ) {
	221	regoff = gpio / XLP_GPIO_REGSZ;
	222	gpio_stat = readl(priv->gpio_intr_stat + regoff * 4);
	223	}
83ea24fd	224
ff718800 KP	225	if (gpio_stat & BIT(gpio % XLP_GPIO_REGSZ))
	226	generic_handle_irq(irq_find_mapping(
	227	priv->chip.irqdomain, gpio));
	228	}
83ea24fd	229	chained_irq_exit(irqchip, desc);
ff718800 KP	230	}
	231
	232	static int xlp_gpio_dir_output(struct gpio_chip *gc, unsigned gpio, int state)
	233	{
e730a595	234	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	235
	236	BUG_ON(gpio >= gc->ngpio);
	237	xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x1);
	238
	239	return 0;
	240	}
	241
	242	static int xlp_gpio_dir_input(struct gpio_chip *gc, unsigned gpio)
	243	{
e730a595	244	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	245
	246	BUG_ON(gpio >= gc->ngpio);
	247	xlp_gpio_set_reg(priv->gpio_out_en, gpio, 0x0);
	248
	249	return 0;
	250	}
	251
	252	static int xlp_gpio_get(struct gpio_chip *gc, unsigned gpio)
	253	{
e730a595	254	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	255
	256	BUG_ON(gpio >= gc->ngpio);
	257	return xlp_gpio_get_reg(priv->gpio_paddrv, gpio);
	258	}
	259
	260	static void xlp_gpio_set(struct gpio_chip *gc, unsigned gpio, int state)
	261	{
e730a595	262	struct xlp_gpio_priv *priv = gpiochip_get_data(gc);
ff718800 KP	263
	264	BUG_ON(gpio >= gc->ngpio);
	265	xlp_gpio_set_reg(priv->gpio_paddrv, gpio, state);
	266	}
	267
	268	static const struct of_device_id xlp_gpio_of_ids[] = {
	269	{
	270	.compatible = "netlogic,xlp832-gpio",
	271	.data = (void *)XLP_GPIO_VARIANT_XLP832,
	272	},
	273	{
	274	.compatible = "netlogic,xlp316-gpio",
	275	.data = (void *)XLP_GPIO_VARIANT_XLP316,
	276	},
	277	{
	278	.compatible = "netlogic,xlp208-gpio",
	279	.data = (void *)XLP_GPIO_VARIANT_XLP208,
	280	},
	281	{
	282	.compatible = "netlogic,xlp980-gpio",
	283	.data = (void *)XLP_GPIO_VARIANT_XLP980,
	284	},
	285	{
	286	.compatible = "netlogic,xlp532-gpio",
	287	.data = (void *)XLP_GPIO_VARIANT_XLP532,
	288	},
dd98756d KP	289	{
	290	.compatible = "brcm,vulcan-gpio",
	291	.data = (void *)GPIO_VARIANT_VULCAN,
	292	},
ff718800 KP	293	{ /* sentinel */ },
	294	};
	295	MODULE_DEVICE_TABLE(of, xlp_gpio_of_ids);
	296
	297	static int xlp_gpio_probe(struct platform_device *pdev)
	298	{
	299	struct gpio_chip *gc;
	300	struct resource *iores;
	301	struct xlp_gpio_priv *priv;
	302	const struct of_device_id *of_id;
	303	void __iomem *gpio_base;
	304	int irq_base, irq, err;
	305	int ngpio;
	306	u32 soc_type;
	307
	308	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	309	if (!iores)
	310	return -ENODEV;
	311
	312	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	313	if (!priv)
	314	return -ENOMEM;
	315
	316	gpio_base = devm_ioremap_resource(&pdev->dev, iores);
	317	if (IS_ERR(gpio_base))
	318	return PTR_ERR(gpio_base);
	319
	320	irq = platform_get_irq(pdev, 0);
	321	if (irq < 0)
	322	return irq;
	323
	324	of_id = of_match_device(xlp_gpio_of_ids, &pdev->dev);
	325	if (!of_id) {
	326	dev_err(&pdev->dev, "Failed to get soc type!\n");
	327	return -ENODEV;
	328	}
	329
	330	soc_type = (uintptr_t) of_id->data;
	331
	332	switch (soc_type) {
	333	case XLP_GPIO_VARIANT_XLP832:
	334	priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
	335	priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
	336	priv->gpio_intr_stat = gpio_base + GPIO_INT_STAT;
	337	priv->gpio_intr_type = gpio_base + GPIO_INT_TYPE;
	338	priv->gpio_intr_pol = gpio_base + GPIO_INT_POL;
	339	priv->gpio_intr_en = gpio_base + GPIO_INT_EN00;
	340	ngpio = 41;
	341	break;
	342	case XLP_GPIO_VARIANT_XLP208:
	343	case XLP_GPIO_VARIANT_XLP316:
	344	priv->gpio_out_en = gpio_base + GPIO_OUTPUT_EN;
	345	priv->gpio_paddrv = gpio_base + GPIO_PADDRV;
	346	priv->gpio_intr_stat = gpio_base + GPIO_3XX_INT_STAT;
	347	priv->gpio_intr_type = gpio_base + GPIO_3XX_INT_TYPE;
	348	priv->gpio_intr_pol = gpio_base + GPIO_3XX_INT_POL;
	349	priv->gpio_intr_en = gpio_base + GPIO_3XX_INT_EN00;
	350
	351	ngpio = (soc_type == XLP_GPIO_VARIANT_XLP208) ? 42 : 57;
	352	break;
	353	case XLP_GPIO_VARIANT_XLP980:
	354	case XLP_GPIO_VARIANT_XLP532:
dd98756d	355	case GPIO_VARIANT_VULCAN:
ff718800 KP	356	priv->gpio_out_en = gpio_base + GPIO_9XX_OUTPUT_EN;
	357	priv->gpio_paddrv = gpio_base + GPIO_9XX_PADDRV;
	358	priv->gpio_intr_stat = gpio_base + GPIO_9XX_INT_STAT;
	359	priv->gpio_intr_type = gpio_base + GPIO_9XX_INT_TYPE;
	360	priv->gpio_intr_pol = gpio_base + GPIO_9XX_INT_POL;
	361	priv->gpio_intr_en = gpio_base + GPIO_9XX_INT_EN00;
	362
dd98756d KP	363	if (soc_type == XLP_GPIO_VARIANT_XLP980)
	364	ngpio = 66;
	365	else if (soc_type == XLP_GPIO_VARIANT_XLP532)
	366	ngpio = 67;
	367	else
	368	ngpio = 70;
ff718800 KP	369	break;
	370	default:
	371	dev_err(&pdev->dev, "Unknown Processor type!\n");
	372	return -ENODEV;
	373	}
	374
	375	bitmap_zero(priv->gpio_enabled_mask, XLP_MAX_NR_GPIO);
	376
	377	gc = &priv->chip;
	378
b8a3f52e AL	379	gc->owner = THIS_MODULE;
b8a3f52e AL	380	gc->label = dev_name(&pdev->dev);
ff718800	381	gc->base = 0;
58383c78	382	gc->parent = &pdev->dev;
ff718800 KP	383	gc->ngpio = ngpio;
	384	gc->of_node = pdev->dev.of_node;
	385	gc->direction_output = xlp_gpio_dir_output;
	386	gc->direction_input = xlp_gpio_dir_input;
	387	gc->set = xlp_gpio_set;
	388	gc->get = xlp_gpio_get;
	389
	390	spin_lock_init(&priv->lock);
dd98756d KP	391	/* XLP has fixed IRQ range for GPIO interrupts */
	392	if (soc_type == GPIO_VARIANT_VULCAN)
	393	irq_base = irq_alloc_descs(-1, 0, gc->ngpio, 0);
	394	else
	395	irq_base = irq_alloc_descs(-1, XLP_GPIO_IRQ_BASE, gc->ngpio, 0);
287980e4	396	if (irq_base < 0) {
ff718800	397	dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
dd98756d	398	return irq_base;
ff718800 KP	399	}
ff718800 KP	400
e730a595	401	err = gpiochip_add_data(gc, priv);
ff718800 KP	402	if (err < 0)
	403	goto out_free_desc;
	404
	405	err = gpiochip_irqchip_add(gc, &xlp_gpio_irq_chip, irq_base,
	406	handle_level_irq, IRQ_TYPE_NONE);
	407	if (err) {
	408	dev_err(&pdev->dev, "Could not connect irqchip to gpiochip!\n");
	409	goto out_gpio_remove;
	410	}
	411
83ea24fd KP	412	gpiochip_set_chained_irqchip(gc, &xlp_gpio_irq_chip, irq,
	413	xlp_gpio_generic_handler);
	414
ff718800 KP	415	dev_info(&pdev->dev, "registered %d GPIOs\n", gc->ngpio);
	416
	417	return 0;
	418
	419	out_gpio_remove:
	420	gpiochip_remove(gc);
	421	out_free_desc:
	422	irq_free_descs(irq_base, gc->ngpio);
	423	return err;
	424	}
	425
	426	static struct platform_driver xlp_gpio_driver = {
	427	.driver = {
	428	.name = "xlp-gpio",
	429	.of_match_table = xlp_gpio_of_ids,
	430	},
	431	.probe = xlp_gpio_probe,
	432	};
	433	module_platform_driver(xlp_gpio_driver);
	434
	435	MODULE_AUTHOR("Kamlakant Patel <[email protected]>");
	436	MODULE_AUTHOR("Ganesan Ramalingam <[email protected]>");
	437	MODULE_DESCRIPTION("Netlogic XLP GPIO Driver");
	438	MODULE_LICENSE("GPL v2");