drivers/gpio/gpio-vf610.c - arm/linux - Git at Google

 /*
  * Freescale vf610 GPIO support through PORT and GPIO
  *
  * Copyright (c) 2014 Toradex AG.
  *
  * Author: Stefan Agner <stefan@agner.ch>.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2
  * of the License, or (at your option) any later version.
  * 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/bitops.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/ioport.h>
 #include <linux/irq.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_irq.h>

 #define VF610_GPIO_PER_PORT		32

 struct fsl_gpio_soc_data {
 	/* SoCs has a Port Data Direction Register (PDDR) */
 	bool have_paddr;
 };

 struct vf610_gpio_port {
 	struct gpio_chip gc;
 	void __iomem *base;
 	void __iomem *gpio_base;
 	const struct fsl_gpio_soc_data *sdata;
 	u8 irqc[VF610_GPIO_PER_PORT];
 	int irq;
 };

 #define GPIO_PDOR		0x00
 #define GPIO_PSOR		0x04
 #define GPIO_PCOR		0x08
 #define GPIO_PTOR		0x0c
 #define GPIO_PDIR		0x10
 #define GPIO_PDDR		0x14

 #define PORT_PCR(n)		((n) * 0x4)
 #define PORT_PCR_IRQC_OFFSET	16

 #define PORT_ISFR		0xa0
 #define PORT_DFER		0xc0
 #define PORT_DFCR		0xc4
 #define PORT_DFWR		0xc8

 #define PORT_INT_OFF		0x0
 #define PORT_INT_LOGIC_ZERO	0x8
 #define PORT_INT_RISING_EDGE	0x9
 #define PORT_INT_FALLING_EDGE	0xa
 #define PORT_INT_EITHER_EDGE	0xb
 #define PORT_INT_LOGIC_ONE	0xc

 static struct irq_chip vf610_gpio_irq_chip;

 static const struct fsl_gpio_soc_data imx_data = {
 	.have_paddr = true,
 };

 static const struct of_device_id vf610_gpio_dt_ids[] = {
 	{ .compatible = "fsl,vf610-gpio",	.data = NULL, },
 	{ .compatible = "fsl,imx7ulp-gpio",	.data = &imx_data, },
 	{ /* sentinel */ }
 };

 static inline void vf610_gpio_writel(u32 val, void __iomem *reg)
 {
 	writel_relaxed(val, reg);
 }

 static inline u32 vf610_gpio_readl(void __iomem *reg)
 {
 	return readl_relaxed(reg);
 }

 static int vf610_gpio_get(struct gpio_chip *gc, unsigned int gpio)
 {
 	struct vf610_gpio_port *port = gpiochip_get_data(gc);
 	unsigned long mask = BIT(gpio);
 	void __iomem *addr;

 	if (port->sdata && port->sdata->have_paddr) {
 		mask &= vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
 		addr = mask ? port->gpio_base + GPIO_PDOR :
 			      port->gpio_base + GPIO_PDIR;
 		return !!(vf610_gpio_readl(addr) & BIT(gpio));
 	} else {
 		return !!(vf610_gpio_readl(port->gpio_base + GPIO_PDIR)
 					   & BIT(gpio));
 	}
 }

 static void vf610_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	struct vf610_gpio_port *port = gpiochip_get_data(gc);
 	unsigned long mask = BIT(gpio);

 	if (val)
 		vf610_gpio_writel(mask, port->gpio_base + GPIO_PSOR);
 	else
 		vf610_gpio_writel(mask, port->gpio_base + GPIO_PCOR);
 }

 static int vf610_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
 {
 	struct vf610_gpio_port *port = gpiochip_get_data(chip);
 	unsigned long mask = BIT(gpio);
 	u32 val;

 	if (port->sdata && port->sdata->have_paddr) {
 		val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
 		val &= ~mask;
 		vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR);
 	}

 	return pinctrl_gpio_direction_input(chip->base + gpio);
 }

 static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
 				       int value)
 {
 	struct vf610_gpio_port *port = gpiochip_get_data(chip);
 	unsigned long mask = BIT(gpio);

 	if (port->sdata && port->sdata->have_paddr)
 		vf610_gpio_writel(mask, port->gpio_base + GPIO_PDDR);

 	vf610_gpio_set(chip, gpio, value);

 	return pinctrl_gpio_direction_output(chip->base + gpio);
 }

 static void vf610_gpio_irq_handler(struct irq_desc *desc)
 {
 	struct vf610_gpio_port *port =
 		gpiochip_get_data(irq_desc_get_handler_data(desc));
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	int pin;
 	unsigned long irq_isfr;

 	chained_irq_enter(chip, desc);

 	irq_isfr = vf610_gpio_readl(port->base + PORT_ISFR);

 	for_each_set_bit(pin, &irq_isfr, VF610_GPIO_PER_PORT) {
 		vf610_gpio_writel(BIT(pin), port->base + PORT_ISFR);

 		generic_handle_irq(irq_find_mapping(port->gc.irqdomain, pin));
 	}

 	chained_irq_exit(chip, desc);
 }

 static void vf610_gpio_irq_ack(struct irq_data *d)
 {
 	struct vf610_gpio_port *port =
 		gpiochip_get_data(irq_data_get_irq_chip_data(d));
 	int gpio = d->hwirq;

 	vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR);
 }

 static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type)
 {
 	struct vf610_gpio_port *port =
 		gpiochip_get_data(irq_data_get_irq_chip_data(d));
 	u8 irqc;

 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
 		irqc = PORT_INT_RISING_EDGE;
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		irqc = PORT_INT_FALLING_EDGE;
 		break;
 	case IRQ_TYPE_EDGE_BOTH:
 		irqc = PORT_INT_EITHER_EDGE;
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		irqc = PORT_INT_LOGIC_ZERO;
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		irqc = PORT_INT_LOGIC_ONE;
 		break;
 	default:
 		return -EINVAL;
 	}

 	port->irqc[d->hwirq] = irqc;

 	if (type & IRQ_TYPE_LEVEL_MASK)
 		irq_set_handler_locked(d, handle_level_irq);
 	else
 		irq_set_handler_locked(d, handle_edge_irq);

 	return 0;
 }

 static void vf610_gpio_irq_mask(struct irq_data *d)
 {
 	struct vf610_gpio_port *port =
 		gpiochip_get_data(irq_data_get_irq_chip_data(d));
 	void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);

 	vf610_gpio_writel(0, pcr_base);
 }

 static void vf610_gpio_irq_unmask(struct irq_data *d)
 {
 	struct vf610_gpio_port *port =
 		gpiochip_get_data(irq_data_get_irq_chip_data(d));
 	void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);

 	vf610_gpio_writel(port->irqc[d->hwirq] << PORT_PCR_IRQC_OFFSET,
 			  pcr_base);
 }

 static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable)
 {
 	struct vf610_gpio_port *port =
 		gpiochip_get_data(irq_data_get_irq_chip_data(d));

 	if (enable)
 		enable_irq_wake(port->irq);
 	else
 		disable_irq_wake(port->irq);

 	return 0;
 }

 static struct irq_chip vf610_gpio_irq_chip = {
 	.name		= "gpio-vf610",
 	.irq_ack	= vf610_gpio_irq_ack,
 	.irq_mask	= vf610_gpio_irq_mask,
 	.irq_unmask	= vf610_gpio_irq_unmask,
 	.irq_set_type	= vf610_gpio_irq_set_type,
 	.irq_set_wake	= vf610_gpio_irq_set_wake,
 };

 static int vf610_gpio_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *of_id = of_match_device(vf610_gpio_dt_ids,
 							   &pdev->dev);
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct vf610_gpio_port *port;
 	struct resource *iores;
 	struct gpio_chip *gc;
 	int ret;

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

 	port->sdata = of_id->data;
 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	port->base = devm_ioremap_resource(dev, iores);
 	if (IS_ERR(port->base))
 		return PTR_ERR(port->base);

 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	port->gpio_base = devm_ioremap_resource(dev, iores);
 	if (IS_ERR(port->gpio_base))
 		return PTR_ERR(port->gpio_base);

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

 	gc = &port->gc;
 	gc->of_node = np;
 	gc->parent = dev;
 	gc->label = "vf610-gpio";
 	gc->ngpio = VF610_GPIO_PER_PORT;
 	gc->base = of_alias_get_id(np, "gpio") * VF610_GPIO_PER_PORT;

 	gc->request = gpiochip_generic_request;
 	gc->free = gpiochip_generic_free;
 	gc->direction_input = vf610_gpio_direction_input;
 	gc->get = vf610_gpio_get;
 	gc->direction_output = vf610_gpio_direction_output;
 	gc->set = vf610_gpio_set;

 	ret = gpiochip_add_data(gc, port);
 	if (ret < 0)
 		return ret;

 	/* Clear the interrupt status register for all GPIO's */
 	vf610_gpio_writel(~0, port->base + PORT_ISFR);

 	ret = gpiochip_irqchip_add(gc, &vf610_gpio_irq_chip, 0,
 				   handle_edge_irq, IRQ_TYPE_NONE);
 	if (ret) {
 		dev_err(dev, "failed to add irqchip\n");
 		gpiochip_remove(gc);
 		return ret;
 	}
 	gpiochip_set_chained_irqchip(gc, &vf610_gpio_irq_chip, port->irq,
 				     vf610_gpio_irq_handler);

 	return 0;
 }

 static struct platform_driver vf610_gpio_driver = {
 	.driver		= {
 		.name	= "gpio-vf610",
 		.of_match_table = vf610_gpio_dt_ids,
 	},
 	.probe		= vf610_gpio_probe,
 };

 builtin_platform_driver(vf610_gpio_driver);
	/*
	* Freescale vf610 GPIO support through PORT and GPIO
	*
	* Copyright (c) 2014 Toradex AG.
	*
	* Author: Stefan Agner <stefan@agner.ch>.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version 2
	* of the License, or (at your option) any later version.
	* 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/bitops.h>
	#include <linux/err.h>
	#include <linux/gpio.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/ioport.h>
	#include <linux/irq.h>
	#include <linux/platform_device.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/of_irq.h>

	#define VF610_GPIO_PER_PORT 32

	struct fsl_gpio_soc_data {
	/* SoCs has a Port Data Direction Register (PDDR) */
	bool have_paddr;
	};

	struct vf610_gpio_port {
	struct gpio_chip gc;
	void __iomem *base;
	void __iomem *gpio_base;
	const struct fsl_gpio_soc_data *sdata;
	u8 irqc[VF610_GPIO_PER_PORT];
	int irq;
	};

	#define GPIO_PDOR 0x00
	#define GPIO_PSOR 0x04
	#define GPIO_PCOR 0x08
	#define GPIO_PTOR 0x0c
	#define GPIO_PDIR 0x10
	#define GPIO_PDDR 0x14

	#define PORT_PCR(n) ((n) * 0x4)
	#define PORT_PCR_IRQC_OFFSET 16

	#define PORT_ISFR 0xa0
	#define PORT_DFER 0xc0
	#define PORT_DFCR 0xc4
	#define PORT_DFWR 0xc8

	#define PORT_INT_OFF 0x0
	#define PORT_INT_LOGIC_ZERO 0x8
	#define PORT_INT_RISING_EDGE 0x9
	#define PORT_INT_FALLING_EDGE 0xa
	#define PORT_INT_EITHER_EDGE 0xb
	#define PORT_INT_LOGIC_ONE 0xc

	static struct irq_chip vf610_gpio_irq_chip;

	static const struct fsl_gpio_soc_data imx_data = {
	.have_paddr = true,
	};

	static const struct of_device_id vf610_gpio_dt_ids[] = {
	{ .compatible = "fsl,vf610-gpio", .data = NULL, },
	{ .compatible = "fsl,imx7ulp-gpio", .data = &imx_data, },
	{ /* sentinel */ }
	};

	static inline void vf610_gpio_writel(u32 val, void __iomem *reg)
	{
	writel_relaxed(val, reg);
	}

	static inline u32 vf610_gpio_readl(void __iomem *reg)
	{
	return readl_relaxed(reg);
	}

	static int vf610_gpio_get(struct gpio_chip *gc, unsigned int gpio)
	{
	struct vf610_gpio_port *port = gpiochip_get_data(gc);
	unsigned long mask = BIT(gpio);
	void __iomem *addr;

	if (port->sdata && port->sdata->have_paddr) {
	mask &= vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
	addr = mask ? port->gpio_base + GPIO_PDOR :
	port->gpio_base + GPIO_PDIR;
	return !!(vf610_gpio_readl(addr) & BIT(gpio));
	} else {
	return !!(vf610_gpio_readl(port->gpio_base + GPIO_PDIR)
	& BIT(gpio));
	}
	}

	static void vf610_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
	{
	struct vf610_gpio_port *port = gpiochip_get_data(gc);
	unsigned long mask = BIT(gpio);

	if (val)
	vf610_gpio_writel(mask, port->gpio_base + GPIO_PSOR);
	else
	vf610_gpio_writel(mask, port->gpio_base + GPIO_PCOR);
	}

	static int vf610_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
	{
	struct vf610_gpio_port *port = gpiochip_get_data(chip);
	unsigned long mask = BIT(gpio);
	u32 val;

	if (port->sdata && port->sdata->have_paddr) {
	val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
	val &= ~mask;
	vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR);
	}

	return pinctrl_gpio_direction_input(chip->base + gpio);
	}

	static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
	int value)
	{
	struct vf610_gpio_port *port = gpiochip_get_data(chip);
	unsigned long mask = BIT(gpio);

	if (port->sdata && port->sdata->have_paddr)
	vf610_gpio_writel(mask, port->gpio_base + GPIO_PDDR);

	vf610_gpio_set(chip, gpio, value);

	return pinctrl_gpio_direction_output(chip->base + gpio);
	}

	static void vf610_gpio_irq_handler(struct irq_desc *desc)
	{
	struct vf610_gpio_port *port =
	gpiochip_get_data(irq_desc_get_handler_data(desc));
	struct irq_chip *chip = irq_desc_get_chip(desc);
	int pin;
	unsigned long irq_isfr;

	chained_irq_enter(chip, desc);

	irq_isfr = vf610_gpio_readl(port->base + PORT_ISFR);

	for_each_set_bit(pin, &irq_isfr, VF610_GPIO_PER_PORT) {
	vf610_gpio_writel(BIT(pin), port->base + PORT_ISFR);

	generic_handle_irq(irq_find_mapping(port->gc.irqdomain, pin));
	}

	chained_irq_exit(chip, desc);
	}

	static void vf610_gpio_irq_ack(struct irq_data *d)
	{
	struct vf610_gpio_port *port =
	gpiochip_get_data(irq_data_get_irq_chip_data(d));
	int gpio = d->hwirq;

	vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR);
	}

	static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type)
	{
	struct vf610_gpio_port *port =
	gpiochip_get_data(irq_data_get_irq_chip_data(d));
	u8 irqc;

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
	irqc = PORT_INT_RISING_EDGE;
	break;
	case IRQ_TYPE_EDGE_FALLING:
	irqc = PORT_INT_FALLING_EDGE;
	break;
	case IRQ_TYPE_EDGE_BOTH:
	irqc = PORT_INT_EITHER_EDGE;
	break;
	case IRQ_TYPE_LEVEL_LOW:
	irqc = PORT_INT_LOGIC_ZERO;
	break;
	case IRQ_TYPE_LEVEL_HIGH:
	irqc = PORT_INT_LOGIC_ONE;
	break;
	default:
	return -EINVAL;
	}

	port->irqc[d->hwirq] = irqc;

	if (type & IRQ_TYPE_LEVEL_MASK)
	irq_set_handler_locked(d, handle_level_irq);
	else
	irq_set_handler_locked(d, handle_edge_irq);

	return 0;
	}

	static void vf610_gpio_irq_mask(struct irq_data *d)
	{
	struct vf610_gpio_port *port =
	gpiochip_get_data(irq_data_get_irq_chip_data(d));
	void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);

	vf610_gpio_writel(0, pcr_base);
	}

	static void vf610_gpio_irq_unmask(struct irq_data *d)
	{
	struct vf610_gpio_port *port =
	gpiochip_get_data(irq_data_get_irq_chip_data(d));
	void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);

	vf610_gpio_writel(port->irqc[d->hwirq] << PORT_PCR_IRQC_OFFSET,
	pcr_base);
	}

	static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable)
	{
	struct vf610_gpio_port *port =
	gpiochip_get_data(irq_data_get_irq_chip_data(d));

	if (enable)
	enable_irq_wake(port->irq);
	else
	disable_irq_wake(port->irq);

	return 0;
	}

	static struct irq_chip vf610_gpio_irq_chip = {
	.name = "gpio-vf610",
	.irq_ack = vf610_gpio_irq_ack,
	.irq_mask = vf610_gpio_irq_mask,
	.irq_unmask = vf610_gpio_irq_unmask,
	.irq_set_type = vf610_gpio_irq_set_type,
	.irq_set_wake = vf610_gpio_irq_set_wake,
	};

	static int vf610_gpio_probe(struct platform_device *pdev)
	{
	const struct of_device_id *of_id = of_match_device(vf610_gpio_dt_ids,
	&pdev->dev);
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct vf610_gpio_port *port;
	struct resource *iores;
	struct gpio_chip *gc;
	int ret;

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

	port->sdata = of_id->data;
	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	port->base = devm_ioremap_resource(dev, iores);
	if (IS_ERR(port->base))
	return PTR_ERR(port->base);

	iores = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	port->gpio_base = devm_ioremap_resource(dev, iores);
	if (IS_ERR(port->gpio_base))
	return PTR_ERR(port->gpio_base);

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

	gc = &port->gc;
	gc->of_node = np;
	gc->parent = dev;
	gc->label = "vf610-gpio";
	gc->ngpio = VF610_GPIO_PER_PORT;
	gc->base = of_alias_get_id(np, "gpio") * VF610_GPIO_PER_PORT;

	gc->request = gpiochip_generic_request;
	gc->free = gpiochip_generic_free;
	gc->direction_input = vf610_gpio_direction_input;
	gc->get = vf610_gpio_get;
	gc->direction_output = vf610_gpio_direction_output;
	gc->set = vf610_gpio_set;

	ret = gpiochip_add_data(gc, port);
	if (ret < 0)
	return ret;

	/* Clear the interrupt status register for all GPIO's */
	vf610_gpio_writel(~0, port->base + PORT_ISFR);

	ret = gpiochip_irqchip_add(gc, &vf610_gpio_irq_chip, 0,
	handle_edge_irq, IRQ_TYPE_NONE);
	if (ret) {
	dev_err(dev, "failed to add irqchip\n");
	gpiochip_remove(gc);
	return ret;
	}
	gpiochip_set_chained_irqchip(gc, &vf610_gpio_irq_chip, port->irq,
	vf610_gpio_irq_handler);

	return 0;
	}

	static struct platform_driver vf610_gpio_driver = {
	.driver = {
	.name = "gpio-vf610",
	.of_match_table = vf610_gpio_dt_ids,
	},
	.probe = vf610_gpio_probe,
	};

	builtin_platform_driver(vf610_gpio_driver);