arch/arm/common/scoop.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Support code for the SCOOP interface found on various Sharp PDAs
  *
  * Copyright (c) 2004 Richard Purdie
  *
  *	Based on code written by Sharp/Lineo for 2.4 kernels
  */

 #include <linux/device.h>
 #include <linux/gpio.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/export.h>
 #include <linux/io.h>
 #include <asm/hardware/scoop.h>

 /* PCMCIA to Scoop linkage

    There is no easy way to link multiple scoop devices into one
    single entity for the pxa2xx_pcmcia device so this structure
    is used which is setup by the platform code.

    This file is never modular so this symbol is always
    accessile to the board support files.
 */
 struct scoop_pcmcia_config *platform_scoop_config;
 EXPORT_SYMBOL(platform_scoop_config);

 struct  scoop_dev {
 	void __iomem *base;
 	struct gpio_chip gpio;
 	spinlock_t scoop_lock;
 	unsigned short suspend_clr;
 	unsigned short suspend_set;
 	u32 scoop_gpwr;
 };

 void reset_scoop(struct device *dev)
 {
 	struct scoop_dev *sdev = dev_get_drvdata(dev);

 	iowrite16(0x0100, sdev->base + SCOOP_MCR);  /* 00 */
 	iowrite16(0x0000, sdev->base + SCOOP_CDR);  /* 04 */
 	iowrite16(0x0000, sdev->base + SCOOP_CCR);  /* 10 */
 	iowrite16(0x0000, sdev->base + SCOOP_IMR);  /* 18 */
 	iowrite16(0x00FF, sdev->base + SCOOP_IRM);  /* 14 */
 	iowrite16(0x0000, sdev->base + SCOOP_ISR);  /* 1C */
 	iowrite16(0x0000, sdev->base + SCOOP_IRM);
 }

 static void __scoop_gpio_set(struct scoop_dev *sdev,
 			unsigned offset, int value)
 {
 	unsigned short gpwr;

 	gpwr = ioread16(sdev->base + SCOOP_GPWR);
 	if (value)
 		gpwr |= 1 << (offset + 1);
 	else
 		gpwr &= ~(1 << (offset + 1));
 	iowrite16(gpwr, sdev->base + SCOOP_GPWR);
 }

 static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
 	struct scoop_dev *sdev = gpiochip_get_data(chip);
 	unsigned long flags;

 	spin_lock_irqsave(&sdev->scoop_lock, flags);

 	__scoop_gpio_set(sdev, offset, value);

 	spin_unlock_irqrestore(&sdev->scoop_lock, flags);
 }

 static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
 	struct scoop_dev *sdev = gpiochip_get_data(chip);

 	/* XXX: I'm unsure, but it seems so */
 	return !!(ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1)));
 }

 static int scoop_gpio_direction_input(struct gpio_chip *chip,
 			unsigned offset)
 {
 	struct scoop_dev *sdev = gpiochip_get_data(chip);
 	unsigned long flags;
 	unsigned short gpcr;

 	spin_lock_irqsave(&sdev->scoop_lock, flags);

 	gpcr = ioread16(sdev->base + SCOOP_GPCR);
 	gpcr &= ~(1 << (offset + 1));
 	iowrite16(gpcr, sdev->base + SCOOP_GPCR);

 	spin_unlock_irqrestore(&sdev->scoop_lock, flags);

 	return 0;
 }

 static int scoop_gpio_direction_output(struct gpio_chip *chip,
 			unsigned offset, int value)
 {
 	struct scoop_dev *sdev = gpiochip_get_data(chip);
 	unsigned long flags;
 	unsigned short gpcr;

 	spin_lock_irqsave(&sdev->scoop_lock, flags);

 	__scoop_gpio_set(sdev, offset, value);

 	gpcr = ioread16(sdev->base + SCOOP_GPCR);
 	gpcr |= 1 << (offset + 1);
 	iowrite16(gpcr, sdev->base + SCOOP_GPCR);

 	spin_unlock_irqrestore(&sdev->scoop_lock, flags);

 	return 0;
 }

 unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
 {
 	struct scoop_dev *sdev = dev_get_drvdata(dev);
 	return ioread16(sdev->base + reg);
 }

 void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
 {
 	struct scoop_dev *sdev = dev_get_drvdata(dev);
 	iowrite16(data, sdev->base + reg);
 }

 EXPORT_SYMBOL(reset_scoop);
 EXPORT_SYMBOL(read_scoop_reg);
 EXPORT_SYMBOL(write_scoop_reg);

 #ifdef CONFIG_PM
 static void check_scoop_reg(struct scoop_dev *sdev)
 {
 	unsigned short mcr;

 	mcr = ioread16(sdev->base + SCOOP_MCR);
 	if ((mcr & 0x100) == 0)
 		iowrite16(0x0101, sdev->base + SCOOP_MCR);
 }

 static int scoop_suspend(struct platform_device *dev, pm_message_t state)
 {
 	struct scoop_dev *sdev = platform_get_drvdata(dev);

 	check_scoop_reg(sdev);
 	sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR);
 	iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR);

 	return 0;
 }

 static int scoop_resume(struct platform_device *dev)
 {
 	struct scoop_dev *sdev = platform_get_drvdata(dev);

 	check_scoop_reg(sdev);
 	iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR);

 	return 0;
 }
 #else
 #define scoop_suspend	NULL
 #define scoop_resume	NULL
 #endif

 static int scoop_probe(struct platform_device *pdev)
 {
 	struct scoop_dev *devptr;
 	struct scoop_config *inf;
 	struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	int ret;

 	if (!mem)
 		return -EINVAL;

 	devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
 	if (!devptr)
 		return -ENOMEM;

 	spin_lock_init(&devptr->scoop_lock);

 	inf = pdev->dev.platform_data;
 	devptr->base = ioremap(mem->start, resource_size(mem));

 	if (!devptr->base) {
 		ret = -ENOMEM;
 		goto err_ioremap;
 	}

 	platform_set_drvdata(pdev, devptr);

 	printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base);

 	iowrite16(0x0140, devptr->base + SCOOP_MCR);
 	reset_scoop(&pdev->dev);
 	iowrite16(0x0000, devptr->base + SCOOP_CPR);
 	iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR);
 	iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR);

 	devptr->suspend_clr = inf->suspend_clr;
 	devptr->suspend_set = inf->suspend_set;

 	devptr->gpio.base = -1;

 	if (inf->gpio_base != 0) {
 		devptr->gpio.label = dev_name(&pdev->dev);
 		devptr->gpio.base = inf->gpio_base;
 		devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */
 		devptr->gpio.set = scoop_gpio_set;
 		devptr->gpio.get = scoop_gpio_get;
 		devptr->gpio.direction_input = scoop_gpio_direction_input;
 		devptr->gpio.direction_output = scoop_gpio_direction_output;

 		ret = gpiochip_add_data(&devptr->gpio, devptr);
 		if (ret)
 			goto err_gpio;
 	}

 	return 0;

 err_gpio:
 	platform_set_drvdata(pdev, NULL);
 err_ioremap:
 	iounmap(devptr->base);
 	kfree(devptr);

 	return ret;
 }

 static int scoop_remove(struct platform_device *pdev)
 {
 	struct scoop_dev *sdev = platform_get_drvdata(pdev);

 	if (!sdev)
 		return -EINVAL;

 	if (sdev->gpio.base != -1)
 		gpiochip_remove(&sdev->gpio);

 	platform_set_drvdata(pdev, NULL);
 	iounmap(sdev->base);
 	kfree(sdev);

 	return 0;
 }

 static struct platform_driver scoop_driver = {
 	.probe		= scoop_probe,
 	.remove		= scoop_remove,
 	.suspend	= scoop_suspend,
 	.resume		= scoop_resume,
 	.driver		= {
 		.name	= "sharp-scoop",
 	},
 };

 static int __init scoop_init(void)
 {
 	return platform_driver_register(&scoop_driver);
 }

 subsys_initcall(scoop_init);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Support code for the SCOOP interface found on various Sharp PDAs
	*
	* Copyright (c) 2004 Richard Purdie
	*
	* Based on code written by Sharp/Lineo for 2.4 kernels
	*/

	#include <linux/device.h>
	#include <linux/gpio.h>
	#include <linux/string.h>
	#include <linux/slab.h>
	#include <linux/platform_device.h>
	#include <linux/export.h>
	#include <linux/io.h>
	#include <asm/hardware/scoop.h>

	/* PCMCIA to Scoop linkage

	There is no easy way to link multiple scoop devices into one
	single entity for the pxa2xx_pcmcia device so this structure
	is used which is setup by the platform code.

	This file is never modular so this symbol is always
	accessile to the board support files.
	*/
	struct scoop_pcmcia_config *platform_scoop_config;
	EXPORT_SYMBOL(platform_scoop_config);

	struct scoop_dev {
	void __iomem *base;
	struct gpio_chip gpio;
	spinlock_t scoop_lock;
	unsigned short suspend_clr;
	unsigned short suspend_set;
	u32 scoop_gpwr;
	};

	void reset_scoop(struct device *dev)
	{
	struct scoop_dev *sdev = dev_get_drvdata(dev);

	iowrite16(0x0100, sdev->base + SCOOP_MCR); /* 00 */
	iowrite16(0x0000, sdev->base + SCOOP_CDR); /* 04 */
	iowrite16(0x0000, sdev->base + SCOOP_CCR); /* 10 */
	iowrite16(0x0000, sdev->base + SCOOP_IMR); /* 18 */
	iowrite16(0x00FF, sdev->base + SCOOP_IRM); /* 14 */
	iowrite16(0x0000, sdev->base + SCOOP_ISR); /* 1C */
	iowrite16(0x0000, sdev->base + SCOOP_IRM);
	}

	static void __scoop_gpio_set(struct scoop_dev *sdev,
	unsigned offset, int value)
	{
	unsigned short gpwr;

	gpwr = ioread16(sdev->base + SCOOP_GPWR);
	if (value)
	gpwr \|= 1 << (offset + 1);
	else
	gpwr &= ~(1 << (offset + 1));
	iowrite16(gpwr, sdev->base + SCOOP_GPWR);
	}

	static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	{
	struct scoop_dev *sdev = gpiochip_get_data(chip);
	unsigned long flags;

	spin_lock_irqsave(&sdev->scoop_lock, flags);

	__scoop_gpio_set(sdev, offset, value);

	spin_unlock_irqrestore(&sdev->scoop_lock, flags);
	}

	static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
	{
	struct scoop_dev *sdev = gpiochip_get_data(chip);

	/* XXX: I'm unsure, but it seems so */
	return !!(ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1)));
	}

	static int scoop_gpio_direction_input(struct gpio_chip *chip,
	unsigned offset)
	{
	struct scoop_dev *sdev = gpiochip_get_data(chip);
	unsigned long flags;
	unsigned short gpcr;

	spin_lock_irqsave(&sdev->scoop_lock, flags);

	gpcr = ioread16(sdev->base + SCOOP_GPCR);
	gpcr &= ~(1 << (offset + 1));
	iowrite16(gpcr, sdev->base + SCOOP_GPCR);

	spin_unlock_irqrestore(&sdev->scoop_lock, flags);

	return 0;
	}

	static int scoop_gpio_direction_output(struct gpio_chip *chip,
	unsigned offset, int value)
	{
	struct scoop_dev *sdev = gpiochip_get_data(chip);
	unsigned long flags;
	unsigned short gpcr;

	spin_lock_irqsave(&sdev->scoop_lock, flags);

	__scoop_gpio_set(sdev, offset, value);

	gpcr = ioread16(sdev->base + SCOOP_GPCR);
	gpcr \|= 1 << (offset + 1);
	iowrite16(gpcr, sdev->base + SCOOP_GPCR);

	spin_unlock_irqrestore(&sdev->scoop_lock, flags);

	return 0;
	}

	unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
	{
	struct scoop_dev *sdev = dev_get_drvdata(dev);
	return ioread16(sdev->base + reg);
	}

	void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
	{
	struct scoop_dev *sdev = dev_get_drvdata(dev);
	iowrite16(data, sdev->base + reg);
	}

	EXPORT_SYMBOL(reset_scoop);
	EXPORT_SYMBOL(read_scoop_reg);
	EXPORT_SYMBOL(write_scoop_reg);

	#ifdef CONFIG_PM
	static void check_scoop_reg(struct scoop_dev *sdev)
	{
	unsigned short mcr;

	mcr = ioread16(sdev->base + SCOOP_MCR);
	if ((mcr & 0x100) == 0)
	iowrite16(0x0101, sdev->base + SCOOP_MCR);
	}

	static int scoop_suspend(struct platform_device *dev, pm_message_t state)
	{
	struct scoop_dev *sdev = platform_get_drvdata(dev);

	check_scoop_reg(sdev);
	sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR);
	iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) \| sdev->suspend_set, sdev->base + SCOOP_GPWR);

	return 0;
	}

	static int scoop_resume(struct platform_device *dev)
	{
	struct scoop_dev *sdev = platform_get_drvdata(dev);

	check_scoop_reg(sdev);
	iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR);

	return 0;
	}
	#else
	#define scoop_suspend NULL
	#define scoop_resume NULL
	#endif

	static int scoop_probe(struct platform_device *pdev)
	{
	struct scoop_dev *devptr;
	struct scoop_config *inf;
	struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	int ret;

	if (!mem)
	return -EINVAL;

	devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
	if (!devptr)
	return -ENOMEM;

	spin_lock_init(&devptr->scoop_lock);

	inf = pdev->dev.platform_data;
	devptr->base = ioremap(mem->start, resource_size(mem));

	if (!devptr->base) {
	ret = -ENOMEM;
	goto err_ioremap;
	}

	platform_set_drvdata(pdev, devptr);

	printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base);

	iowrite16(0x0140, devptr->base + SCOOP_MCR);
	reset_scoop(&pdev->dev);
	iowrite16(0x0000, devptr->base + SCOOP_CPR);
	iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR);
	iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR);

	devptr->suspend_clr = inf->suspend_clr;
	devptr->suspend_set = inf->suspend_set;

	devptr->gpio.base = -1;

	if (inf->gpio_base != 0) {
	devptr->gpio.label = dev_name(&pdev->dev);
	devptr->gpio.base = inf->gpio_base;
	devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */
	devptr->gpio.set = scoop_gpio_set;
	devptr->gpio.get = scoop_gpio_get;
	devptr->gpio.direction_input = scoop_gpio_direction_input;
	devptr->gpio.direction_output = scoop_gpio_direction_output;

	ret = gpiochip_add_data(&devptr->gpio, devptr);
	if (ret)
	goto err_gpio;
	}

	return 0;

	err_gpio:
	platform_set_drvdata(pdev, NULL);
	err_ioremap:
	iounmap(devptr->base);
	kfree(devptr);

	return ret;
	}

	static int scoop_remove(struct platform_device *pdev)
	{
	struct scoop_dev *sdev = platform_get_drvdata(pdev);

	if (!sdev)
	return -EINVAL;

	if (sdev->gpio.base != -1)
	gpiochip_remove(&sdev->gpio);

	platform_set_drvdata(pdev, NULL);
	iounmap(sdev->base);
	kfree(sdev);

	return 0;
	}

	static struct platform_driver scoop_driver = {
	.probe = scoop_probe,
	.remove = scoop_remove,
	.suspend = scoop_suspend,
	.resume = scoop_resume,
	.driver = {
	.name = "sharp-scoop",
	},
	};

	static int __init scoop_init(void)
	{
	return platform_driver_register(&scoop_driver);
	}

	subsys_initcall(scoop_init);