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

 /*
  * timbgpio.c timberdale FPGA GPIO driver
  * Copyright (c) 2009 Intel Corporation
  *
  * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

 /* Supports:
  * Timberdale FPGA GPIO
  */

 #include <linux/module.h>
 #include <linux/gpio.h>
 #include <linux/platform_device.h>
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/timb_gpio.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>

 #define DRIVER_NAME "timb-gpio"

 #define TGPIOVAL	0x00
 #define TGPIODIR	0x04
 #define TGPIO_IER	0x08
 #define TGPIO_ISR	0x0c
 #define TGPIO_IPR	0x10
 #define TGPIO_ICR	0x14
 #define TGPIO_FLR	0x18
 #define TGPIO_LVR	0x1c
 #define TGPIO_VER	0x20
 #define TGPIO_BFLR	0x24

 struct timbgpio {
 	void __iomem		*membase;
 	spinlock_t		lock; /* mutual exclusion */
 	struct gpio_chip	gpio;
 	int			irq_base;
 };

 static int timbgpio_update_bit(struct gpio_chip *gpio, unsigned index,
 	unsigned offset, bool enabled)
 {
 	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
 	u32 reg;

 	spin_lock(&tgpio->lock);
 	reg = ioread32(tgpio->membase + offset);

 	if (enabled)
 		reg |= (1 << index);
 	else
 		reg &= ~(1 << index);

 	iowrite32(reg, tgpio->membase + offset);
 	spin_unlock(&tgpio->lock);

 	return 0;
 }

 static int timbgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
 {
 	return timbgpio_update_bit(gpio, nr, TGPIODIR, true);
 }

 static int timbgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
 {
 	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
 	u32 value;

 	value = ioread32(tgpio->membase + TGPIOVAL);
 	return (value & (1 << nr)) ? 1 : 0;
 }

 static int timbgpio_gpio_direction_output(struct gpio_chip *gpio,
 						unsigned nr, int val)
 {
 	return timbgpio_update_bit(gpio, nr, TGPIODIR, false);
 }

 static void timbgpio_gpio_set(struct gpio_chip *gpio,
 				unsigned nr, int val)
 {
 	timbgpio_update_bit(gpio, nr, TGPIOVAL, val != 0);
 }

 static int timbgpio_to_irq(struct gpio_chip *gpio, unsigned offset)
 {
 	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);

 	if (tgpio->irq_base <= 0)
 		return -EINVAL;

 	return tgpio->irq_base + offset;
 }

 /*
  * GPIO IRQ
  */
 static void timbgpio_irq_disable(unsigned irq)
 {
 	struct timbgpio *tgpio = get_irq_chip_data(irq);
 	int offset = irq - tgpio->irq_base;

 	timbgpio_update_bit(&tgpio->gpio, offset, TGPIO_IER, 0);
 }

 static void timbgpio_irq_enable(unsigned irq)
 {
 	struct timbgpio *tgpio = get_irq_chip_data(irq);
 	int offset = irq - tgpio->irq_base;

 	timbgpio_update_bit(&tgpio->gpio, offset, TGPIO_IER, 1);
 }

 static int timbgpio_irq_type(unsigned irq, unsigned trigger)
 {
 	struct timbgpio *tgpio = get_irq_chip_data(irq);
 	int offset = irq - tgpio->irq_base;
 	unsigned long flags;
 	u32 lvr, flr, bflr = 0;
 	u32 ver;

 	if (offset < 0 || offset > tgpio->gpio.ngpio)
 		return -EINVAL;

 	ver = ioread32(tgpio->membase + TGPIO_VER);

 	spin_lock_irqsave(&tgpio->lock, flags);

 	lvr = ioread32(tgpio->membase + TGPIO_LVR);
 	flr = ioread32(tgpio->membase + TGPIO_FLR);
 	if (ver > 2)
 		bflr = ioread32(tgpio->membase + TGPIO_BFLR);

 	if (trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
 		bflr &= ~(1 << offset);
 		flr &= ~(1 << offset);
 		if (trigger & IRQ_TYPE_LEVEL_HIGH)
 			lvr |= 1 << offset;
 		else
 			lvr &= ~(1 << offset);
 	}

 	if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
 		if (ver < 3)
 			return -EINVAL;
 		else {
 			flr |= 1 << offset;
 			bflr |= 1 << offset;
 		}
 	} else {
 		bflr &= ~(1 << offset);
 		flr |= 1 << offset;
 		if (trigger & IRQ_TYPE_EDGE_FALLING)
 			lvr &= ~(1 << offset);
 		else
 			lvr |= 1 << offset;
 	}

 	iowrite32(lvr, tgpio->membase + TGPIO_LVR);
 	iowrite32(flr, tgpio->membase + TGPIO_FLR);
 	if (ver > 2)
 		iowrite32(bflr, tgpio->membase + TGPIO_BFLR);

 	iowrite32(1 << offset, tgpio->membase + TGPIO_ICR);
 	spin_unlock_irqrestore(&tgpio->lock, flags);

 	return 0;
 }

 static void timbgpio_irq(unsigned int irq, struct irq_desc *desc)
 {
 	struct timbgpio *tgpio = get_irq_data(irq);
 	unsigned long ipr;
 	int offset;

 	desc->chip->ack(irq);
 	ipr = ioread32(tgpio->membase + TGPIO_IPR);
 	iowrite32(ipr, tgpio->membase + TGPIO_ICR);

 	for_each_set_bit(offset, &ipr, tgpio->gpio.ngpio)
 		generic_handle_irq(timbgpio_to_irq(&tgpio->gpio, offset));
 }

 static struct irq_chip timbgpio_irqchip = {
 	.name		= "GPIO",
 	.enable		= timbgpio_irq_enable,
 	.disable	= timbgpio_irq_disable,
 	.set_type	= timbgpio_irq_type,
 };

 static int __devinit timbgpio_probe(struct platform_device *pdev)
 {
 	int err, i;
 	struct gpio_chip *gc;
 	struct timbgpio *tgpio;
 	struct resource *iomem;
 	struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
 	int irq = platform_get_irq(pdev, 0);

 	if (!pdata || pdata->nr_pins > 32) {
 		err = -EINVAL;
 		goto err_mem;
 	}

 	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!iomem) {
 		err = -EINVAL;
 		goto err_mem;
 	}

 	tgpio = kzalloc(sizeof(*tgpio), GFP_KERNEL);
 	if (!tgpio) {
 		err = -EINVAL;
 		goto err_mem;
 	}
 	tgpio->irq_base = pdata->irq_base;

 	spin_lock_init(&tgpio->lock);

 	if (!request_mem_region(iomem->start, resource_size(iomem),
 		DRIVER_NAME)) {
 		err = -EBUSY;
 		goto err_request;
 	}

 	tgpio->membase = ioremap(iomem->start, resource_size(iomem));
 	if (!tgpio->membase) {
 		err = -ENOMEM;
 		goto err_ioremap;
 	}

 	gc = &tgpio->gpio;

 	gc->label = dev_name(&pdev->dev);
 	gc->owner = THIS_MODULE;
 	gc->dev = &pdev->dev;
 	gc->direction_input = timbgpio_gpio_direction_input;
 	gc->get = timbgpio_gpio_get;
 	gc->direction_output = timbgpio_gpio_direction_output;
 	gc->set = timbgpio_gpio_set;
 	gc->to_irq = (irq >= 0 && tgpio->irq_base > 0) ? timbgpio_to_irq : NULL;
 	gc->dbg_show = NULL;
 	gc->base = pdata->gpio_base;
 	gc->ngpio = pdata->nr_pins;
 	gc->can_sleep = 0;

 	err = gpiochip_add(gc);
 	if (err)
 		goto err_chipadd;

 	platform_set_drvdata(pdev, tgpio);

 	/* make sure to disable interrupts */
 	iowrite32(0x0, tgpio->membase + TGPIO_IER);

 	if (irq < 0 || tgpio->irq_base <= 0)
 		return 0;

 	for (i = 0; i < pdata->nr_pins; i++) {
 		set_irq_chip_and_handler_name(tgpio->irq_base + i,
 			&timbgpio_irqchip, handle_simple_irq, "mux");
 		set_irq_chip_data(tgpio->irq_base + i, tgpio);
 #ifdef CONFIG_ARM
 		set_irq_flags(tgpio->irq_base + i, IRQF_VALID | IRQF_PROBE);
 #endif
 	}

 	set_irq_data(irq, tgpio);
 	set_irq_chained_handler(irq, timbgpio_irq);

 	return 0;

 err_chipadd:
 	iounmap(tgpio->membase);
 err_ioremap:
 	release_mem_region(iomem->start, resource_size(iomem));
 err_request:
 	kfree(tgpio);
 err_mem:
 	printk(KERN_ERR DRIVER_NAME": Failed to register GPIOs: %d\n", err);

 	return err;
 }

 static int __devexit timbgpio_remove(struct platform_device *pdev)
 {
 	int err;
 	struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
 	struct timbgpio *tgpio = platform_get_drvdata(pdev);
 	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	int irq = platform_get_irq(pdev, 0);

 	if (irq >= 0 && tgpio->irq_base > 0) {
 		int i;
 		for (i = 0; i < pdata->nr_pins; i++) {
 			set_irq_chip(tgpio->irq_base + i, NULL);
 			set_irq_chip_data(tgpio->irq_base + i, NULL);
 		}

 		set_irq_handler(irq, NULL);
 		set_irq_data(irq, NULL);
 	}

 	err = gpiochip_remove(&tgpio->gpio);
 	if (err)
 		printk(KERN_ERR DRIVER_NAME": failed to remove gpio_chip\n");

 	iounmap(tgpio->membase);
 	release_mem_region(iomem->start, resource_size(iomem));
 	kfree(tgpio);

 	platform_set_drvdata(pdev, NULL);

 	return 0;
 }

 static struct platform_driver timbgpio_platform_driver = {
 	.driver = {
 		.name	= DRIVER_NAME,
 		.owner	= THIS_MODULE,
 	},
 	.probe		= timbgpio_probe,
 	.remove		= timbgpio_remove,
 };

 /*--------------------------------------------------------------------------*/

 static int __init timbgpio_init(void)
 {
 	return platform_driver_register(&timbgpio_platform_driver);
 }

 static void __exit timbgpio_exit(void)
 {
 	platform_driver_unregister(&timbgpio_platform_driver);
 }

 module_init(timbgpio_init);
 module_exit(timbgpio_exit);

 MODULE_DESCRIPTION("Timberdale GPIO driver");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Mocean Laboratories");
 MODULE_ALIAS("platform:"DRIVER_NAME);
	/*
	* timbgpio.c timberdale FPGA GPIO driver
	* Copyright (c) 2009 Intel Corporation
	*
	* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	/* Supports:
	* Timberdale FPGA GPIO
	*/

	#include <linux/module.h>
	#include <linux/gpio.h>
	#include <linux/platform_device.h>
	#include <linux/irq.h>
	#include <linux/io.h>
	#include <linux/timb_gpio.h>
	#include <linux/interrupt.h>
	#include <linux/slab.h>

	#define DRIVER_NAME "timb-gpio"

	#define TGPIOVAL 0x00
	#define TGPIODIR 0x04
	#define TGPIO_IER 0x08
	#define TGPIO_ISR 0x0c
	#define TGPIO_IPR 0x10
	#define TGPIO_ICR 0x14
	#define TGPIO_FLR 0x18
	#define TGPIO_LVR 0x1c
	#define TGPIO_VER 0x20
	#define TGPIO_BFLR 0x24

	struct timbgpio {
	void __iomem *membase;
	spinlock_t lock; /* mutual exclusion */
	struct gpio_chip gpio;
	int irq_base;
	};

	static int timbgpio_update_bit(struct gpio_chip *gpio, unsigned index,
	unsigned offset, bool enabled)
	{
	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
	u32 reg;

	spin_lock(&tgpio->lock);
	reg = ioread32(tgpio->membase + offset);

	if (enabled)
	reg \|= (1 << index);
	else
	reg &= ~(1 << index);

	iowrite32(reg, tgpio->membase + offset);
	spin_unlock(&tgpio->lock);

	return 0;
	}

	static int timbgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
	{
	return timbgpio_update_bit(gpio, nr, TGPIODIR, true);
	}

	static int timbgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
	{
	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
	u32 value;

	value = ioread32(tgpio->membase + TGPIOVAL);
	return (value & (1 << nr)) ? 1 : 0;
	}

	static int timbgpio_gpio_direction_output(struct gpio_chip *gpio,
	unsigned nr, int val)
	{
	return timbgpio_update_bit(gpio, nr, TGPIODIR, false);
	}

	static void timbgpio_gpio_set(struct gpio_chip *gpio,
	unsigned nr, int val)
	{
	timbgpio_update_bit(gpio, nr, TGPIOVAL, val != 0);
	}

	static int timbgpio_to_irq(struct gpio_chip *gpio, unsigned offset)
	{
	struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);

	if (tgpio->irq_base <= 0)
	return -EINVAL;

	return tgpio->irq_base + offset;
	}

	/*
	* GPIO IRQ
	*/
	static void timbgpio_irq_disable(unsigned irq)
	{
	struct timbgpio *tgpio = get_irq_chip_data(irq);
	int offset = irq - tgpio->irq_base;

	timbgpio_update_bit(&tgpio->gpio, offset, TGPIO_IER, 0);
	}

	static void timbgpio_irq_enable(unsigned irq)
	{
	struct timbgpio *tgpio = get_irq_chip_data(irq);
	int offset = irq - tgpio->irq_base;

	timbgpio_update_bit(&tgpio->gpio, offset, TGPIO_IER, 1);
	}

	static int timbgpio_irq_type(unsigned irq, unsigned trigger)
	{
	struct timbgpio *tgpio = get_irq_chip_data(irq);
	int offset = irq - tgpio->irq_base;
	unsigned long flags;
	u32 lvr, flr, bflr = 0;
	u32 ver;

	if (offset < 0 \|\| offset > tgpio->gpio.ngpio)
	return -EINVAL;

	ver = ioread32(tgpio->membase + TGPIO_VER);

	spin_lock_irqsave(&tgpio->lock, flags);

	lvr = ioread32(tgpio->membase + TGPIO_LVR);
	flr = ioread32(tgpio->membase + TGPIO_FLR);
	if (ver > 2)
	bflr = ioread32(tgpio->membase + TGPIO_BFLR);

	if (trigger & (IRQ_TYPE_LEVEL_HIGH \| IRQ_TYPE_LEVEL_LOW)) {
	bflr &= ~(1 << offset);
	flr &= ~(1 << offset);
	if (trigger & IRQ_TYPE_LEVEL_HIGH)
	lvr \|= 1 << offset;
	else
	lvr &= ~(1 << offset);
	}

	if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
	if (ver < 3)
	return -EINVAL;
	else {
	flr \|= 1 << offset;
	bflr \|= 1 << offset;
	}
	} else {
	bflr &= ~(1 << offset);
	flr \|= 1 << offset;
	if (trigger & IRQ_TYPE_EDGE_FALLING)
	lvr &= ~(1 << offset);
	else
	lvr \|= 1 << offset;
	}

	iowrite32(lvr, tgpio->membase + TGPIO_LVR);
	iowrite32(flr, tgpio->membase + TGPIO_FLR);
	if (ver > 2)
	iowrite32(bflr, tgpio->membase + TGPIO_BFLR);

	iowrite32(1 << offset, tgpio->membase + TGPIO_ICR);
	spin_unlock_irqrestore(&tgpio->lock, flags);

	return 0;
	}

	static void timbgpio_irq(unsigned int irq, struct irq_desc *desc)
	{
	struct timbgpio *tgpio = get_irq_data(irq);
	unsigned long ipr;
	int offset;

	desc->chip->ack(irq);
	ipr = ioread32(tgpio->membase + TGPIO_IPR);
	iowrite32(ipr, tgpio->membase + TGPIO_ICR);

	for_each_set_bit(offset, &ipr, tgpio->gpio.ngpio)
	generic_handle_irq(timbgpio_to_irq(&tgpio->gpio, offset));
	}

	static struct irq_chip timbgpio_irqchip = {
	.name = "GPIO",
	.enable = timbgpio_irq_enable,
	.disable = timbgpio_irq_disable,
	.set_type = timbgpio_irq_type,
	};

	static int __devinit timbgpio_probe(struct platform_device *pdev)
	{
	int err, i;
	struct gpio_chip *gc;
	struct timbgpio *tgpio;
	struct resource *iomem;
	struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
	int irq = platform_get_irq(pdev, 0);

	if (!pdata \|\| pdata->nr_pins > 32) {
	err = -EINVAL;
	goto err_mem;
	}

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iomem) {
	err = -EINVAL;
	goto err_mem;
	}

	tgpio = kzalloc(sizeof(*tgpio), GFP_KERNEL);
	if (!tgpio) {
	err = -EINVAL;
	goto err_mem;
	}
	tgpio->irq_base = pdata->irq_base;

	spin_lock_init(&tgpio->lock);

	if (!request_mem_region(iomem->start, resource_size(iomem),
	DRIVER_NAME)) {
	err = -EBUSY;
	goto err_request;
	}

	tgpio->membase = ioremap(iomem->start, resource_size(iomem));
	if (!tgpio->membase) {
	err = -ENOMEM;
	goto err_ioremap;
	}

	gc = &tgpio->gpio;

	gc->label = dev_name(&pdev->dev);
	gc->owner = THIS_MODULE;
	gc->dev = &pdev->dev;
	gc->direction_input = timbgpio_gpio_direction_input;
	gc->get = timbgpio_gpio_get;
	gc->direction_output = timbgpio_gpio_direction_output;
	gc->set = timbgpio_gpio_set;
	gc->to_irq = (irq >= 0 && tgpio->irq_base > 0) ? timbgpio_to_irq : NULL;
	gc->dbg_show = NULL;
	gc->base = pdata->gpio_base;
	gc->ngpio = pdata->nr_pins;
	gc->can_sleep = 0;

	err = gpiochip_add(gc);
	if (err)
	goto err_chipadd;

	platform_set_drvdata(pdev, tgpio);

	/* make sure to disable interrupts */
	iowrite32(0x0, tgpio->membase + TGPIO_IER);

	if (irq < 0 \|\| tgpio->irq_base <= 0)
	return 0;

	for (i = 0; i < pdata->nr_pins; i++) {
	set_irq_chip_and_handler_name(tgpio->irq_base + i,
	&timbgpio_irqchip, handle_simple_irq, "mux");
	set_irq_chip_data(tgpio->irq_base + i, tgpio);
	#ifdef CONFIG_ARM
	set_irq_flags(tgpio->irq_base + i, IRQF_VALID \| IRQF_PROBE);
	#endif
	}

	set_irq_data(irq, tgpio);
	set_irq_chained_handler(irq, timbgpio_irq);

	return 0;

	err_chipadd:
	iounmap(tgpio->membase);
	err_ioremap:
	release_mem_region(iomem->start, resource_size(iomem));
	err_request:
	kfree(tgpio);
	err_mem:
	printk(KERN_ERR DRIVER_NAME": Failed to register GPIOs: %d\n", err);

	return err;
	}

	static int __devexit timbgpio_remove(struct platform_device *pdev)
	{
	int err;
	struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
	struct timbgpio *tgpio = platform_get_drvdata(pdev);
	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	int irq = platform_get_irq(pdev, 0);

	if (irq >= 0 && tgpio->irq_base > 0) {
	int i;
	for (i = 0; i < pdata->nr_pins; i++) {
	set_irq_chip(tgpio->irq_base + i, NULL);
	set_irq_chip_data(tgpio->irq_base + i, NULL);
	}

	set_irq_handler(irq, NULL);
	set_irq_data(irq, NULL);
	}

	err = gpiochip_remove(&tgpio->gpio);
	if (err)
	printk(KERN_ERR DRIVER_NAME": failed to remove gpio_chip\n");

	iounmap(tgpio->membase);
	release_mem_region(iomem->start, resource_size(iomem));
	kfree(tgpio);

	platform_set_drvdata(pdev, NULL);

	return 0;
	}

	static struct platform_driver timbgpio_platform_driver = {
	.driver = {
	.name = DRIVER_NAME,
	.owner = THIS_MODULE,
	},
	.probe = timbgpio_probe,
	.remove = timbgpio_remove,
	};

	/--------------------------------------------------------------------------/

	static int __init timbgpio_init(void)
	{
	return platform_driver_register(&timbgpio_platform_driver);
	}

	static void __exit timbgpio_exit(void)
	{
	platform_driver_unregister(&timbgpio_platform_driver);
	}

	module_init(timbgpio_init);
	module_exit(timbgpio_exit);

	MODULE_DESCRIPTION("Timberdale GPIO driver");
	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Mocean Laboratories");
	MODULE_ALIAS("platform:"DRIVER_NAME);