drivers/gpio/gpio-mt7621.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  */

 #include <linux/err.h>
 #include <linux/gpio/driver.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of_irq.h>
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>

 #define MTK_BANK_CNT	3
 #define MTK_BANK_WIDTH	32

 #define GPIO_BANK_STRIDE	0x04
 #define GPIO_REG_CTRL		0x00
 #define GPIO_REG_POL		0x10
 #define GPIO_REG_DATA		0x20
 #define GPIO_REG_DSET		0x30
 #define GPIO_REG_DCLR		0x40
 #define GPIO_REG_REDGE		0x50
 #define GPIO_REG_FEDGE		0x60
 #define GPIO_REG_HLVL		0x70
 #define GPIO_REG_LLVL		0x80
 #define GPIO_REG_STAT		0x90
 #define GPIO_REG_EDGE		0xA0

 struct mtk_gc {
 	struct irq_chip irq_chip;
 	struct gpio_chip chip;
 	spinlock_t lock;
 	int bank;
 	u32 rising;
 	u32 falling;
 	u32 hlevel;
 	u32 llevel;
 };

 /**
  * struct mtk - state container for
  * data of the platform driver. It is 3
  * separate gpio-chip each one with its
  * own irq_chip.
  * @dev: device instance
  * @base: memory base address
  * @gpio_irq: irq number from the device tree
  * @gc_map: array of the gpio chips
  */
 struct mtk {
 	struct device *dev;
 	void __iomem *base;
 	int gpio_irq;
 	struct mtk_gc gc_map[MTK_BANK_CNT];
 };

 static inline struct mtk_gc *
 to_mediatek_gpio(struct gpio_chip *chip)
 {
 	return container_of(chip, struct mtk_gc, chip);
 }

 static inline void
 mtk_gpio_w32(struct mtk_gc *rg, u32 offset, u32 val)
 {
 	struct gpio_chip *gc = &rg->chip;
 	struct mtk *mtk = gpiochip_get_data(gc);

 	offset = (rg->bank * GPIO_BANK_STRIDE) + offset;
 	gc->write_reg(mtk->base + offset, val);
 }

 static inline u32
 mtk_gpio_r32(struct mtk_gc *rg, u32 offset)
 {
 	struct gpio_chip *gc = &rg->chip;
 	struct mtk *mtk = gpiochip_get_data(gc);

 	offset = (rg->bank * GPIO_BANK_STRIDE) + offset;
 	return gc->read_reg(mtk->base + offset);
 }

 static irqreturn_t
 mediatek_gpio_irq_handler(int irq, void *data)
 {
 	struct gpio_chip *gc = data;
 	struct mtk_gc *rg = to_mediatek_gpio(gc);
 	irqreturn_t ret = IRQ_NONE;
 	unsigned long pending;
 	int bit;

 	pending = mtk_gpio_r32(rg, GPIO_REG_STAT);

 	for_each_set_bit(bit, &pending, MTK_BANK_WIDTH) {
 		u32 map = irq_find_mapping(gc->irq.domain, bit);

 		generic_handle_irq(map);
 		mtk_gpio_w32(rg, GPIO_REG_STAT, BIT(bit));
 		ret |= IRQ_HANDLED;
 	}

 	return ret;
 }

 static void
 mediatek_gpio_irq_unmask(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct mtk_gc *rg = to_mediatek_gpio(gc);
 	int pin = d->hwirq;
 	unsigned long flags;
 	u32 rise, fall, high, low;

 	spin_lock_irqsave(&rg->lock, flags);
 	rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
 	fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
 	high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
 	low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
 	mtk_gpio_w32(rg, GPIO_REG_REDGE, rise | (BIT(pin) & rg->rising));
 	mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall | (BIT(pin) & rg->falling));
 	mtk_gpio_w32(rg, GPIO_REG_HLVL, high | (BIT(pin) & rg->hlevel));
 	mtk_gpio_w32(rg, GPIO_REG_LLVL, low | (BIT(pin) & rg->llevel));
 	spin_unlock_irqrestore(&rg->lock, flags);
 }

 static void
 mediatek_gpio_irq_mask(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct mtk_gc *rg = to_mediatek_gpio(gc);
 	int pin = d->hwirq;
 	unsigned long flags;
 	u32 rise, fall, high, low;

 	spin_lock_irqsave(&rg->lock, flags);
 	rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
 	fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
 	high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
 	low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
 	mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall & ~BIT(pin));
 	mtk_gpio_w32(rg, GPIO_REG_REDGE, rise & ~BIT(pin));
 	mtk_gpio_w32(rg, GPIO_REG_HLVL, high & ~BIT(pin));
 	mtk_gpio_w32(rg, GPIO_REG_LLVL, low & ~BIT(pin));
 	spin_unlock_irqrestore(&rg->lock, flags);
 }

 static int
 mediatek_gpio_irq_type(struct irq_data *d, unsigned int type)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct mtk_gc *rg = to_mediatek_gpio(gc);
 	int pin = d->hwirq;
 	u32 mask = BIT(pin);

 	if (type == IRQ_TYPE_PROBE) {
 		if ((rg->rising | rg->falling |
 		     rg->hlevel | rg->llevel) & mask)
 			return 0;

 		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 	}

 	rg->rising &= ~mask;
 	rg->falling &= ~mask;
 	rg->hlevel &= ~mask;
 	rg->llevel &= ~mask;

 	switch (type & IRQ_TYPE_SENSE_MASK) {
 	case IRQ_TYPE_EDGE_BOTH:
 		rg->rising |= mask;
 		rg->falling |= mask;
 		break;
 	case IRQ_TYPE_EDGE_RISING:
 		rg->rising |= mask;
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		rg->falling |= mask;
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		rg->hlevel |= mask;
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		rg->llevel |= mask;
 		break;
 	}

 	return 0;
 }

 static int
 mediatek_gpio_xlate(struct gpio_chip *chip,
 		    const struct of_phandle_args *spec, u32 *flags)
 {
 	int gpio = spec->args[0];
 	struct mtk_gc *rg = to_mediatek_gpio(chip);

 	if (rg->bank != gpio / MTK_BANK_WIDTH)
 		return -EINVAL;

 	if (flags)
 		*flags = spec->args[1];

 	return gpio % MTK_BANK_WIDTH;
 }

 static int
 mediatek_gpio_bank_probe(struct device *dev,
 			 struct device_node *node, int bank)
 {
 	struct mtk *mtk = dev_get_drvdata(dev);
 	struct mtk_gc *rg;
 	void __iomem *dat, *set, *ctrl, *diro;
 	int ret;

 	rg = &mtk->gc_map[bank];
 	memset(rg, 0, sizeof(*rg));

 	spin_lock_init(&rg->lock);
 	rg->chip.of_node = node;
 	rg->bank = bank;

 	dat = mtk->base + GPIO_REG_DATA + (rg->bank * GPIO_BANK_STRIDE);
 	set = mtk->base + GPIO_REG_DSET + (rg->bank * GPIO_BANK_STRIDE);
 	ctrl = mtk->base + GPIO_REG_DCLR + (rg->bank * GPIO_BANK_STRIDE);
 	diro = mtk->base + GPIO_REG_CTRL + (rg->bank * GPIO_BANK_STRIDE);

 	ret = bgpio_init(&rg->chip, dev, 4,
 			 dat, set, ctrl, diro, NULL, 0);
 	if (ret) {
 		dev_err(dev, "bgpio_init() failed\n");
 		return ret;
 	}

 	rg->chip.of_gpio_n_cells = 2;
 	rg->chip.of_xlate = mediatek_gpio_xlate;
 	rg->chip.label = devm_kasprintf(dev, GFP_KERNEL, "%s-bank%d",
 					dev_name(dev), bank);
 	if (!rg->chip.label)
 		return -ENOMEM;

 	rg->irq_chip.name = dev_name(dev);
 	rg->irq_chip.parent_device = dev;
 	rg->irq_chip.irq_unmask = mediatek_gpio_irq_unmask;
 	rg->irq_chip.irq_mask = mediatek_gpio_irq_mask;
 	rg->irq_chip.irq_mask_ack = mediatek_gpio_irq_mask;
 	rg->irq_chip.irq_set_type = mediatek_gpio_irq_type;

 	if (mtk->gpio_irq) {
 		struct gpio_irq_chip *girq;

 		/*
 		 * Directly request the irq here instead of passing
 		 * a flow-handler to gpiochip_set_chained_irqchip,
 		 * because the irq is shared.
 		 */
 		ret = devm_request_irq(dev, mtk->gpio_irq,
 				       mediatek_gpio_irq_handler, IRQF_SHARED,
 				       rg->chip.label, &rg->chip);

 		if (ret) {
 			dev_err(dev, "Error requesting IRQ %d: %d\n",
 				mtk->gpio_irq, ret);
 			return ret;
 		}

 		girq = &rg->chip.irq;
 		girq->chip = &rg->irq_chip;
 		/* This will let us handle the parent IRQ in the driver */
 		girq->parent_handler = NULL;
 		girq->num_parents = 0;
 		girq->parents = NULL;
 		girq->default_type = IRQ_TYPE_NONE;
 		girq->handler = handle_simple_irq;
 	}

 	ret = devm_gpiochip_add_data(dev, &rg->chip, mtk);
 	if (ret < 0) {
 		dev_err(dev, "Could not register gpio %d, ret=%d\n",
 			rg->chip.ngpio, ret);
 		return ret;
 	}

 	/* set polarity to low for all gpios */
 	mtk_gpio_w32(rg, GPIO_REG_POL, 0);

 	dev_info(dev, "registering %d gpios\n", rg->chip.ngpio);

 	return 0;
 }

 static int
 mediatek_gpio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct mtk *mtk;
 	int i;
 	int ret;

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

 	mtk->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(mtk->base))
 		return PTR_ERR(mtk->base);

 	mtk->gpio_irq = irq_of_parse_and_map(np, 0);
 	mtk->dev = dev;
 	platform_set_drvdata(pdev, mtk);

 	for (i = 0; i < MTK_BANK_CNT; i++) {
 		ret = mediatek_gpio_bank_probe(dev, np, i);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 static const struct of_device_id mediatek_gpio_match[] = {
 	{ .compatible = "mediatek,mt7621-gpio" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, mediatek_gpio_match);

 static struct platform_driver mediatek_gpio_driver = {
 	.probe = mediatek_gpio_probe,
 	.driver = {
 		.name = "mt7621_gpio",
 		.of_match_table = mediatek_gpio_match,
 	},
 };

 builtin_platform_driver(mediatek_gpio_driver);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
	* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
	*/

	#include <linux/err.h>
	#include <linux/gpio/driver.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/module.h>
	#include <linux/of_irq.h>
	#include <linux/platform_device.h>
	#include <linux/spinlock.h>

	#define MTK_BANK_CNT 3
	#define MTK_BANK_WIDTH 32

	#define GPIO_BANK_STRIDE 0x04
	#define GPIO_REG_CTRL 0x00
	#define GPIO_REG_POL 0x10
	#define GPIO_REG_DATA 0x20
	#define GPIO_REG_DSET 0x30
	#define GPIO_REG_DCLR 0x40
	#define GPIO_REG_REDGE 0x50
	#define GPIO_REG_FEDGE 0x60
	#define GPIO_REG_HLVL 0x70
	#define GPIO_REG_LLVL 0x80
	#define GPIO_REG_STAT 0x90
	#define GPIO_REG_EDGE 0xA0

	struct mtk_gc {
	struct irq_chip irq_chip;
	struct gpio_chip chip;
	spinlock_t lock;
	int bank;
	u32 rising;
	u32 falling;
	u32 hlevel;
	u32 llevel;
	};

	/**
	* struct mtk - state container for
	* data of the platform driver. It is 3
	* separate gpio-chip each one with its
	* own irq_chip.
	* @dev: device instance
	* @base: memory base address
	* @gpio_irq: irq number from the device tree
	* @gc_map: array of the gpio chips
	*/
	struct mtk {
	struct device *dev;
	void __iomem *base;
	int gpio_irq;
	struct mtk_gc gc_map[MTK_BANK_CNT];
	};

	static inline struct mtk_gc *
	to_mediatek_gpio(struct gpio_chip *chip)
	{
	return container_of(chip, struct mtk_gc, chip);
	}

	static inline void
	mtk_gpio_w32(struct mtk_gc *rg, u32 offset, u32 val)
	{
	struct gpio_chip *gc = &rg->chip;
	struct mtk *mtk = gpiochip_get_data(gc);

	offset = (rg->bank * GPIO_BANK_STRIDE) + offset;
	gc->write_reg(mtk->base + offset, val);
	}

	static inline u32
	mtk_gpio_r32(struct mtk_gc *rg, u32 offset)
	{
	struct gpio_chip *gc = &rg->chip;
	struct mtk *mtk = gpiochip_get_data(gc);

	offset = (rg->bank * GPIO_BANK_STRIDE) + offset;
	return gc->read_reg(mtk->base + offset);
	}

	static irqreturn_t
	mediatek_gpio_irq_handler(int irq, void *data)
	{
	struct gpio_chip *gc = data;
	struct mtk_gc *rg = to_mediatek_gpio(gc);
	irqreturn_t ret = IRQ_NONE;
	unsigned long pending;
	int bit;

	pending = mtk_gpio_r32(rg, GPIO_REG_STAT);

	for_each_set_bit(bit, &pending, MTK_BANK_WIDTH) {
	u32 map = irq_find_mapping(gc->irq.domain, bit);

	generic_handle_irq(map);
	mtk_gpio_w32(rg, GPIO_REG_STAT, BIT(bit));
	ret \|= IRQ_HANDLED;
	}

	return ret;
	}

	static void
	mediatek_gpio_irq_unmask(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct mtk_gc *rg = to_mediatek_gpio(gc);
	int pin = d->hwirq;
	unsigned long flags;
	u32 rise, fall, high, low;

	spin_lock_irqsave(&rg->lock, flags);
	rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
	fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
	high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
	low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
	mtk_gpio_w32(rg, GPIO_REG_REDGE, rise \| (BIT(pin) & rg->rising));
	mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall \| (BIT(pin) & rg->falling));
	mtk_gpio_w32(rg, GPIO_REG_HLVL, high \| (BIT(pin) & rg->hlevel));
	mtk_gpio_w32(rg, GPIO_REG_LLVL, low \| (BIT(pin) & rg->llevel));
	spin_unlock_irqrestore(&rg->lock, flags);
	}

	static void
	mediatek_gpio_irq_mask(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct mtk_gc *rg = to_mediatek_gpio(gc);
	int pin = d->hwirq;
	unsigned long flags;
	u32 rise, fall, high, low;

	spin_lock_irqsave(&rg->lock, flags);
	rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
	fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
	high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
	low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
	mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall & ~BIT(pin));
	mtk_gpio_w32(rg, GPIO_REG_REDGE, rise & ~BIT(pin));
	mtk_gpio_w32(rg, GPIO_REG_HLVL, high & ~BIT(pin));
	mtk_gpio_w32(rg, GPIO_REG_LLVL, low & ~BIT(pin));
	spin_unlock_irqrestore(&rg->lock, flags);
	}

	static int
	mediatek_gpio_irq_type(struct irq_data *d, unsigned int type)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct mtk_gc *rg = to_mediatek_gpio(gc);
	int pin = d->hwirq;
	u32 mask = BIT(pin);

	if (type == IRQ_TYPE_PROBE) {
	if ((rg->rising \| rg->falling \|
	rg->hlevel \| rg->llevel) & mask)
	return 0;

	type = IRQ_TYPE_EDGE_RISING \| IRQ_TYPE_EDGE_FALLING;
	}

	rg->rising &= ~mask;
	rg->falling &= ~mask;
	rg->hlevel &= ~mask;
	rg->llevel &= ~mask;

	switch (type & IRQ_TYPE_SENSE_MASK) {
	case IRQ_TYPE_EDGE_BOTH:
	rg->rising \|= mask;
	rg->falling \|= mask;
	break;
	case IRQ_TYPE_EDGE_RISING:
	rg->rising \|= mask;
	break;
	case IRQ_TYPE_EDGE_FALLING:
	rg->falling \|= mask;
	break;
	case IRQ_TYPE_LEVEL_HIGH:
	rg->hlevel \|= mask;
	break;
	case IRQ_TYPE_LEVEL_LOW:
	rg->llevel \|= mask;
	break;
	}

	return 0;
	}

	static int
	mediatek_gpio_xlate(struct gpio_chip *chip,
	const struct of_phandle_args spec, u32 flags)
	{
	int gpio = spec->args[0];
	struct mtk_gc *rg = to_mediatek_gpio(chip);

	if (rg->bank != gpio / MTK_BANK_WIDTH)
	return -EINVAL;

	if (flags)
	*flags = spec->args[1];

	return gpio % MTK_BANK_WIDTH;
	}

	static int
	mediatek_gpio_bank_probe(struct device *dev,
	struct device_node *node, int bank)
	{
	struct mtk *mtk = dev_get_drvdata(dev);
	struct mtk_gc *rg;
	void __iomem dat, set, ctrl, diro;
	int ret;

	rg = &mtk->gc_map[bank];
	memset(rg, 0, sizeof(*rg));

	spin_lock_init(&rg->lock);
	rg->chip.of_node = node;
	rg->bank = bank;

	dat = mtk->base + GPIO_REG_DATA + (rg->bank * GPIO_BANK_STRIDE);
	set = mtk->base + GPIO_REG_DSET + (rg->bank * GPIO_BANK_STRIDE);
	ctrl = mtk->base + GPIO_REG_DCLR + (rg->bank * GPIO_BANK_STRIDE);
	diro = mtk->base + GPIO_REG_CTRL + (rg->bank * GPIO_BANK_STRIDE);

	ret = bgpio_init(&rg->chip, dev, 4,
	dat, set, ctrl, diro, NULL, 0);
	if (ret) {
	dev_err(dev, "bgpio_init() failed\n");
	return ret;
	}

	rg->chip.of_gpio_n_cells = 2;
	rg->chip.of_xlate = mediatek_gpio_xlate;
	rg->chip.label = devm_kasprintf(dev, GFP_KERNEL, "%s-bank%d",
	dev_name(dev), bank);
	if (!rg->chip.label)
	return -ENOMEM;

	rg->irq_chip.name = dev_name(dev);
	rg->irq_chip.parent_device = dev;
	rg->irq_chip.irq_unmask = mediatek_gpio_irq_unmask;
	rg->irq_chip.irq_mask = mediatek_gpio_irq_mask;
	rg->irq_chip.irq_mask_ack = mediatek_gpio_irq_mask;
	rg->irq_chip.irq_set_type = mediatek_gpio_irq_type;

	if (mtk->gpio_irq) {
	struct gpio_irq_chip *girq;

	/*
	* Directly request the irq here instead of passing
	* a flow-handler to gpiochip_set_chained_irqchip,
	* because the irq is shared.
	*/
	ret = devm_request_irq(dev, mtk->gpio_irq,
	mediatek_gpio_irq_handler, IRQF_SHARED,
	rg->chip.label, &rg->chip);

	if (ret) {
	dev_err(dev, "Error requesting IRQ %d: %d\n",
	mtk->gpio_irq, ret);
	return ret;
	}

	girq = &rg->chip.irq;
	girq->chip = &rg->irq_chip;
	/* This will let us handle the parent IRQ in the driver */
	girq->parent_handler = NULL;
	girq->num_parents = 0;
	girq->parents = NULL;
	girq->default_type = IRQ_TYPE_NONE;
	girq->handler = handle_simple_irq;
	}

	ret = devm_gpiochip_add_data(dev, &rg->chip, mtk);
	if (ret < 0) {
	dev_err(dev, "Could not register gpio %d, ret=%d\n",
	rg->chip.ngpio, ret);
	return ret;
	}

	/* set polarity to low for all gpios */
	mtk_gpio_w32(rg, GPIO_REG_POL, 0);

	dev_info(dev, "registering %d gpios\n", rg->chip.ngpio);

	return 0;
	}

	static int
	mediatek_gpio_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct mtk *mtk;
	int i;
	int ret;

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

	mtk->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(mtk->base))
	return PTR_ERR(mtk->base);

	mtk->gpio_irq = irq_of_parse_and_map(np, 0);
	mtk->dev = dev;
	platform_set_drvdata(pdev, mtk);

	for (i = 0; i < MTK_BANK_CNT; i++) {
	ret = mediatek_gpio_bank_probe(dev, np, i);
	if (ret)
	return ret;
	}

	return 0;
	}

	static const struct of_device_id mediatek_gpio_match[] = {
	{ .compatible = "mediatek,mt7621-gpio" },
	{},
	};
	MODULE_DEVICE_TABLE(of, mediatek_gpio_match);

	static struct platform_driver mediatek_gpio_driver = {
	.probe = mediatek_gpio_probe,
	.driver = {
	.name = "mt7621_gpio",
	.of_match_table = mediatek_gpio_match,
	},
	};

	builtin_platform_driver(mediatek_gpio_driver);