drivers/gpio/gpio-tb10x.c - kernel/msm-4.9 - Gitiles

 /* Abilis Systems MODULE DESCRIPTION
  *
  * Copyright (C) Abilis Systems 2013
  *
  * Authors: Sascha Leuenberger <sascha.leuenberger@abilis.com>
  *          Christian Ruppert <christian.ruppert@abilis.com>
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
 #include <linux/slab.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/of_gpio.h>
 #include <linux/spinlock.h>
 #include <linux/bitops.h>
 #include <linux/pinctrl/consumer.h>

 #define TB10X_GPIO_DIR_IN	(0x00000000)
 #define TB10X_GPIO_DIR_OUT	(0x00000001)
 #define OFFSET_TO_REG_DDR	(0x00)
 #define OFFSET_TO_REG_DATA	(0x04)
 #define OFFSET_TO_REG_INT_EN	(0x08)
 #define OFFSET_TO_REG_CHANGE	(0x0C)
 #define OFFSET_TO_REG_WRMASK	(0x10)
 #define OFFSET_TO_REG_INT_TYPE	(0x14)


 /**
  * @spinlock: used for atomic read/modify/write of registers
  * @base: register base address
  * @domain: IRQ domain of GPIO generated interrupts managed by this controller
  * @irq: Interrupt line of parent interrupt controller
  * @gc: gpio_chip structure associated to this GPIO controller
  */
 struct tb10x_gpio {
 	spinlock_t spinlock;
 	void __iomem *base;
 	struct irq_domain *domain;
 	int irq;
 	struct gpio_chip gc;
 };

 static inline u32 tb10x_reg_read(struct tb10x_gpio *gpio, unsigned int offs)
 {
 	return ioread32(gpio->base + offs);
 }

 static inline void tb10x_reg_write(struct tb10x_gpio *gpio, unsigned int offs,
 				u32 val)
 {
 	iowrite32(val, gpio->base + offs);
 }

 static inline void tb10x_set_bits(struct tb10x_gpio *gpio, unsigned int offs,
 				u32 mask, u32 val)
 {
 	u32 r;
 	unsigned long flags;

 	spin_lock_irqsave(&gpio->spinlock, flags);

 	r = tb10x_reg_read(gpio, offs);
 	r = (r & ~mask) | (val & mask);

 	tb10x_reg_write(gpio, offs, r);

 	spin_unlock_irqrestore(&gpio->spinlock, flags);
 }

 static inline struct tb10x_gpio *to_tb10x_gpio(struct gpio_chip *chip)
 {
 	return container_of(chip, struct tb10x_gpio, gc);
 }

 static int tb10x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
 {
 	struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
 	int mask = BIT(offset);
 	int val = TB10X_GPIO_DIR_IN << offset;

 	tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DDR, mask, val);

 	return 0;
 }

 static int tb10x_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
 	struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
 	int val;

 	val = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_DATA);

 	if (val & BIT(offset))
 		return 1;
 	else
 		return 0;
 }

 static void tb10x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
 	struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
 	int mask = BIT(offset);
 	int val = value << offset;

 	tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DATA, mask, val);
 }

 static int tb10x_gpio_direction_out(struct gpio_chip *chip,
 					unsigned offset, int value)
 {
 	struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
 	int mask = BIT(offset);
 	int val = TB10X_GPIO_DIR_OUT << offset;

 	tb10x_gpio_set(chip, offset, value);
 	tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DDR, mask, val);

 	return 0;
 }

 static int tb10x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 {
 	struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);

 	return irq_create_mapping(tb10x_gpio->domain, offset);
 }

 static int tb10x_gpio_irq_set_type(struct irq_data *data, unsigned int type)
 {
 	if ((type & IRQF_TRIGGER_MASK) != IRQ_TYPE_EDGE_BOTH) {
 		pr_err("Only (both) edge triggered interrupts supported.\n");
 		return -EINVAL;
 	}

 	irqd_set_trigger_type(data, type);

 	return IRQ_SET_MASK_OK;
 }

 static irqreturn_t tb10x_gpio_irq_cascade(int irq, void *data)
 {
 	struct tb10x_gpio *tb10x_gpio = data;
 	u32 r = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_CHANGE);
 	u32 m = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_INT_EN);
 	const unsigned long bits = r & m;
 	int i;

 	for_each_set_bit(i, &bits, 32)
 		generic_handle_irq(irq_find_mapping(tb10x_gpio->domain, i));

 	return IRQ_HANDLED;
 }

 static int tb10x_gpio_probe(struct platform_device *pdev)
 {
 	struct tb10x_gpio *tb10x_gpio;
 	struct resource *mem;
 	struct device_node *dn = pdev->dev.of_node;
 	int ret = -EBUSY;
 	u32 ngpio;

 	if (!dn)
 		return -EINVAL;

 	if (of_property_read_u32(dn, "abilis,ngpio", &ngpio))
 		return -EINVAL;

 	tb10x_gpio = devm_kzalloc(&pdev->dev, sizeof(*tb10x_gpio), GFP_KERNEL);
 	if (tb10x_gpio == NULL)
 		return -ENOMEM;

 	spin_lock_init(&tb10x_gpio->spinlock);

 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	tb10x_gpio->base = devm_ioremap_resource(&pdev->dev, mem);
 	if (IS_ERR(tb10x_gpio->base))
 		return PTR_ERR(tb10x_gpio->base);

 	tb10x_gpio->gc.label		= of_node_full_name(dn);
 	tb10x_gpio->gc.dev		= &pdev->dev;
 	tb10x_gpio->gc.owner		= THIS_MODULE;
 	tb10x_gpio->gc.direction_input	= tb10x_gpio_direction_in;
 	tb10x_gpio->gc.get		= tb10x_gpio_get;
 	tb10x_gpio->gc.direction_output	= tb10x_gpio_direction_out;
 	tb10x_gpio->gc.set		= tb10x_gpio_set;
 	tb10x_gpio->gc.request		= gpiochip_generic_request;
 	tb10x_gpio->gc.free		= gpiochip_generic_free;
 	tb10x_gpio->gc.base		= -1;
 	tb10x_gpio->gc.ngpio		= ngpio;
 	tb10x_gpio->gc.can_sleep	= false;


 	ret = gpiochip_add(&tb10x_gpio->gc);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Could not add gpiochip.\n");
 		goto fail_gpiochip_registration;
 	}

 	platform_set_drvdata(pdev, tb10x_gpio);

 	if (of_find_property(dn, "interrupt-controller", NULL)) {
 		struct irq_chip_generic *gc;

 		ret = platform_get_irq(pdev, 0);
 		if (ret < 0) {
 			dev_err(&pdev->dev, "No interrupt specified.\n");
 			goto fail_get_irq;
 		}

 		tb10x_gpio->gc.to_irq	= tb10x_gpio_to_irq;
 		tb10x_gpio->irq		= ret;

 		ret = devm_request_irq(&pdev->dev, ret, tb10x_gpio_irq_cascade,
 				IRQF_TRIGGER_NONE | IRQF_SHARED,
 				dev_name(&pdev->dev), tb10x_gpio);
 		if (ret != 0)
 			goto fail_request_irq;

 		tb10x_gpio->domain = irq_domain_add_linear(dn,
 						tb10x_gpio->gc.ngpio,
 						&irq_generic_chip_ops, NULL);
 		if (!tb10x_gpio->domain) {
 			ret = -ENOMEM;
 			goto fail_irq_domain;
 		}

 		ret = irq_alloc_domain_generic_chips(tb10x_gpio->domain,
 				tb10x_gpio->gc.ngpio, 1, tb10x_gpio->gc.label,
 				handle_edge_irq, IRQ_NOREQUEST, IRQ_NOPROBE,
 				IRQ_GC_INIT_MASK_CACHE);
 		if (ret)
 			goto fail_irq_domain;

 		gc = tb10x_gpio->domain->gc->gc[0];
 		gc->reg_base                         = tb10x_gpio->base;
 		gc->chip_types[0].type               = IRQ_TYPE_EDGE_BOTH;
 		gc->chip_types[0].chip.irq_ack       = irq_gc_ack_set_bit;
 		gc->chip_types[0].chip.irq_mask      = irq_gc_mask_clr_bit;
 		gc->chip_types[0].chip.irq_unmask    = irq_gc_mask_set_bit;
 		gc->chip_types[0].chip.irq_set_type  = tb10x_gpio_irq_set_type;
 		gc->chip_types[0].regs.ack           = OFFSET_TO_REG_CHANGE;
 		gc->chip_types[0].regs.mask          = OFFSET_TO_REG_INT_EN;
 	}

 	return 0;

 fail_irq_domain:
 fail_request_irq:
 fail_get_irq:
 	gpiochip_remove(&tb10x_gpio->gc);
 fail_gpiochip_registration:
 fail_ioremap:
 	return ret;
 }

 static int tb10x_gpio_remove(struct platform_device *pdev)
 {
 	struct tb10x_gpio *tb10x_gpio = platform_get_drvdata(pdev);

 	if (tb10x_gpio->gc.to_irq) {
 		irq_remove_generic_chip(tb10x_gpio->domain->gc->gc[0],
 					BIT(tb10x_gpio->gc.ngpio) - 1, 0, 0);
 		kfree(tb10x_gpio->domain->gc);
 		irq_domain_remove(tb10x_gpio->domain);
 	}
 	gpiochip_remove(&tb10x_gpio->gc);

 	return 0;
 }

 static const struct of_device_id tb10x_gpio_dt_ids[] = {
 	{ .compatible = "abilis,tb10x-gpio" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, tb10x_gpio_dt_ids);

 static struct platform_driver tb10x_gpio_driver = {
 	.probe		= tb10x_gpio_probe,
 	.remove		= tb10x_gpio_remove,
 	.driver = {
 		.name	= "tb10x-gpio",
 		.of_match_table = tb10x_gpio_dt_ids,
 	}
 };

 module_platform_driver(tb10x_gpio_driver);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("tb10x gpio.");
 MODULE_VERSION("0.0.1");
	/* Abilis Systems MODULE DESCRIPTION
	*
	* Copyright (C) Abilis Systems 2013
	*
	* Authors: Sascha Leuenberger <sascha.leuenberger@abilis.com>
	* Christian Ruppert <christian.ruppert@abilis.com>
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/gpio.h>
	#include <linux/slab.h>
	#include <linux/irq.h>
	#include <linux/irqdomain.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/of.h>
	#include <linux/of_platform.h>
	#include <linux/of_gpio.h>
	#include <linux/spinlock.h>
	#include <linux/bitops.h>
	#include <linux/pinctrl/consumer.h>

	#define TB10X_GPIO_DIR_IN (0x00000000)
	#define TB10X_GPIO_DIR_OUT (0x00000001)
	#define OFFSET_TO_REG_DDR (0x00)
	#define OFFSET_TO_REG_DATA (0x04)
	#define OFFSET_TO_REG_INT_EN (0x08)
	#define OFFSET_TO_REG_CHANGE (0x0C)
	#define OFFSET_TO_REG_WRMASK (0x10)
	#define OFFSET_TO_REG_INT_TYPE (0x14)


	/**
	* @spinlock: used for atomic read/modify/write of registers
	* @base: register base address
	* @domain: IRQ domain of GPIO generated interrupts managed by this controller
	* @irq: Interrupt line of parent interrupt controller
	* @gc: gpio_chip structure associated to this GPIO controller
	*/
	struct tb10x_gpio {
	spinlock_t spinlock;
	void __iomem *base;
	struct irq_domain *domain;
	int irq;
	struct gpio_chip gc;
	};

	static inline u32 tb10x_reg_read(struct tb10x_gpio *gpio, unsigned int offs)
	{
	return ioread32(gpio->base + offs);
	}

	static inline void tb10x_reg_write(struct tb10x_gpio *gpio, unsigned int offs,
	u32 val)
	{
	iowrite32(val, gpio->base + offs);
	}

	static inline void tb10x_set_bits(struct tb10x_gpio *gpio, unsigned int offs,
	u32 mask, u32 val)
	{
	u32 r;
	unsigned long flags;

	spin_lock_irqsave(&gpio->spinlock, flags);

	r = tb10x_reg_read(gpio, offs);
	r = (r & ~mask) \| (val & mask);

	tb10x_reg_write(gpio, offs, r);

	spin_unlock_irqrestore(&gpio->spinlock, flags);
	}

	static inline struct tb10x_gpio to_tb10x_gpio(struct gpio_chip chip)
	{
	return container_of(chip, struct tb10x_gpio, gc);
	}

	static int tb10x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
	{
	struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
	int mask = BIT(offset);
	int val = TB10X_GPIO_DIR_IN << offset;

	tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DDR, mask, val);

	return 0;
	}

	static int tb10x_gpio_get(struct gpio_chip *chip, unsigned offset)
	{
	struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
	int val;

	val = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_DATA);

	if (val & BIT(offset))
	return 1;
	else
	return 0;
	}

	static void tb10x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	{
	struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
	int mask = BIT(offset);
	int val = value << offset;

	tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DATA, mask, val);
	}

	static int tb10x_gpio_direction_out(struct gpio_chip *chip,
	unsigned offset, int value)
	{
	struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);
	int mask = BIT(offset);
	int val = TB10X_GPIO_DIR_OUT << offset;

	tb10x_gpio_set(chip, offset, value);
	tb10x_set_bits(tb10x_gpio, OFFSET_TO_REG_DDR, mask, val);

	return 0;
	}

	static int tb10x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
	{
	struct tb10x_gpio *tb10x_gpio = to_tb10x_gpio(chip);

	return irq_create_mapping(tb10x_gpio->domain, offset);
	}

	static int tb10x_gpio_irq_set_type(struct irq_data *data, unsigned int type)
	{
	if ((type & IRQF_TRIGGER_MASK) != IRQ_TYPE_EDGE_BOTH) {
	pr_err("Only (both) edge triggered interrupts supported.\n");
	return -EINVAL;
	}

	irqd_set_trigger_type(data, type);

	return IRQ_SET_MASK_OK;
	}

	static irqreturn_t tb10x_gpio_irq_cascade(int irq, void *data)
	{
	struct tb10x_gpio *tb10x_gpio = data;
	u32 r = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_CHANGE);
	u32 m = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_INT_EN);
	const unsigned long bits = r & m;
	int i;

	for_each_set_bit(i, &bits, 32)
	generic_handle_irq(irq_find_mapping(tb10x_gpio->domain, i));

	return IRQ_HANDLED;
	}

	static int tb10x_gpio_probe(struct platform_device *pdev)
	{
	struct tb10x_gpio *tb10x_gpio;
	struct resource *mem;
	struct device_node *dn = pdev->dev.of_node;
	int ret = -EBUSY;
	u32 ngpio;

	if (!dn)
	return -EINVAL;

	if (of_property_read_u32(dn, "abilis,ngpio", &ngpio))
	return -EINVAL;

	tb10x_gpio = devm_kzalloc(&pdev->dev, sizeof(*tb10x_gpio), GFP_KERNEL);
	if (tb10x_gpio == NULL)
	return -ENOMEM;

	spin_lock_init(&tb10x_gpio->spinlock);

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	tb10x_gpio->base = devm_ioremap_resource(&pdev->dev, mem);
	if (IS_ERR(tb10x_gpio->base))
	return PTR_ERR(tb10x_gpio->base);

	tb10x_gpio->gc.label = of_node_full_name(dn);
	tb10x_gpio->gc.dev = &pdev->dev;
	tb10x_gpio->gc.owner = THIS_MODULE;
	tb10x_gpio->gc.direction_input = tb10x_gpio_direction_in;
	tb10x_gpio->gc.get = tb10x_gpio_get;
	tb10x_gpio->gc.direction_output = tb10x_gpio_direction_out;
	tb10x_gpio->gc.set = tb10x_gpio_set;
	tb10x_gpio->gc.request = gpiochip_generic_request;
	tb10x_gpio->gc.free = gpiochip_generic_free;
	tb10x_gpio->gc.base = -1;
	tb10x_gpio->gc.ngpio = ngpio;
	tb10x_gpio->gc.can_sleep = false;


	ret = gpiochip_add(&tb10x_gpio->gc);
	if (ret < 0) {
	dev_err(&pdev->dev, "Could not add gpiochip.\n");
	goto fail_gpiochip_registration;
	}

	platform_set_drvdata(pdev, tb10x_gpio);

	if (of_find_property(dn, "interrupt-controller", NULL)) {
	struct irq_chip_generic *gc;

	ret = platform_get_irq(pdev, 0);
	if (ret < 0) {
	dev_err(&pdev->dev, "No interrupt specified.\n");
	goto fail_get_irq;
	}

	tb10x_gpio->gc.to_irq = tb10x_gpio_to_irq;
	tb10x_gpio->irq = ret;

	ret = devm_request_irq(&pdev->dev, ret, tb10x_gpio_irq_cascade,
	IRQF_TRIGGER_NONE \| IRQF_SHARED,
	dev_name(&pdev->dev), tb10x_gpio);
	if (ret != 0)
	goto fail_request_irq;

	tb10x_gpio->domain = irq_domain_add_linear(dn,
	tb10x_gpio->gc.ngpio,
	&irq_generic_chip_ops, NULL);
	if (!tb10x_gpio->domain) {
	ret = -ENOMEM;
	goto fail_irq_domain;
	}

	ret = irq_alloc_domain_generic_chips(tb10x_gpio->domain,
	tb10x_gpio->gc.ngpio, 1, tb10x_gpio->gc.label,
	handle_edge_irq, IRQ_NOREQUEST, IRQ_NOPROBE,
	IRQ_GC_INIT_MASK_CACHE);
	if (ret)
	goto fail_irq_domain;

	gc = tb10x_gpio->domain->gc->gc[0];
	gc->reg_base = tb10x_gpio->base;
	gc->chip_types[0].type = IRQ_TYPE_EDGE_BOTH;
	gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
	gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
	gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
	gc->chip_types[0].chip.irq_set_type = tb10x_gpio_irq_set_type;
	gc->chip_types[0].regs.ack = OFFSET_TO_REG_CHANGE;
	gc->chip_types[0].regs.mask = OFFSET_TO_REG_INT_EN;
	}

	return 0;

	fail_irq_domain:
	fail_request_irq:
	fail_get_irq:
	gpiochip_remove(&tb10x_gpio->gc);
	fail_gpiochip_registration:
	fail_ioremap:
	return ret;
	}

	static int tb10x_gpio_remove(struct platform_device *pdev)
	{
	struct tb10x_gpio *tb10x_gpio = platform_get_drvdata(pdev);

	if (tb10x_gpio->gc.to_irq) {
	irq_remove_generic_chip(tb10x_gpio->domain->gc->gc[0],
	BIT(tb10x_gpio->gc.ngpio) - 1, 0, 0);
	kfree(tb10x_gpio->domain->gc);
	irq_domain_remove(tb10x_gpio->domain);
	}
	gpiochip_remove(&tb10x_gpio->gc);

	return 0;
	}

	static const struct of_device_id tb10x_gpio_dt_ids[] = {
	{ .compatible = "abilis,tb10x-gpio" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, tb10x_gpio_dt_ids);

	static struct platform_driver tb10x_gpio_driver = {
	.probe = tb10x_gpio_probe,
	.remove = tb10x_gpio_remove,
	.driver = {
	.name = "tb10x-gpio",
	.of_match_table = tb10x_gpio_dt_ids,
	}
	};

	module_platform_driver(tb10x_gpio_driver);
	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("tb10x gpio.");
	MODULE_VERSION("0.0.1");