drivers/gpio/gpio-amd8111.c - kernel/msm-4.9 - Gitiles

 /*
  * GPIO driver for AMD 8111 south bridges
  *
  * Copyright (c) 2012 Dmitry Eremin-Solenikov
  *
  * Based on the AMD RNG driver:
  * Copyright 2005 (c) MontaVista Software, Inc.
  * with the majority of the code coming from:
  *
  * Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)
  * (c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com>
  *
  * derived from
  *
  * Hardware driver for the AMD 768 Random Number Generator (RNG)
  * (c) Copyright 2001 Red Hat Inc
  *
  * derived from
  *
  * Hardware driver for Intel i810 Random Number Generator (RNG)
  * Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
  * Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
  *
  * This file is licensed under  the terms of the GNU General Public
  * License version 2. This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
  */
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/gpio.h>
 #include <linux/pci.h>
 #include <linux/spinlock.h>

 #define PMBASE_OFFSET 0xb0
 #define PMBASE_SIZE   0x30

 #define AMD_REG_GPIO(i) (0x10 + (i))

 #define AMD_GPIO_LTCH_STS	0x40 /* Latch status, w1 */
 #define AMD_GPIO_RTIN		0x20 /* Real Time in, ro */
 #define AMD_GPIO_DEBOUNCE	0x10 /* Debounce, rw */
 #define AMD_GPIO_MODE_MASK	0x0c /* Pin Mode Select, rw */
 #define AMD_GPIO_MODE_IN	0x00
 #define AMD_GPIO_MODE_OUT	0x04
 /* Enable alternative (e.g. clkout, IRQ, etc) function of the pin */
 #define AMD_GPIO_MODE_ALTFN	0x08 /* Or 0x09 */
 #define AMD_GPIO_X_MASK		0x03 /* In/Out specific, rw */
 #define AMD_GPIO_X_IN_ACTIVEHI	0x01 /* Active High */
 #define AMD_GPIO_X_IN_LATCH	0x02 /* Latched version is selected */
 #define AMD_GPIO_X_OUT_LOW	0x00
 #define AMD_GPIO_X_OUT_HI	0x01
 #define AMD_GPIO_X_OUT_CLK0	0x02
 #define AMD_GPIO_X_OUT_CLK1	0x03

 /*
  * Data for PCI driver interface
  *
  * This data only exists for exporting the supported
  * PCI ids via MODULE_DEVICE_TABLE.  We do not actually
  * register a pci_driver, because someone else might one day
  * want to register another driver on the same PCI id.
  */
 static const struct pci_device_id pci_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS), 0 },
 	{ 0, },	/* terminate list */
 };
 MODULE_DEVICE_TABLE(pci, pci_tbl);

 struct amd_gpio {
 	struct gpio_chip	chip;
 	u32			pmbase;
 	void __iomem		*pm;
 	struct pci_dev		*pdev;
 	spinlock_t		lock; /* guards hw registers and orig table */
 	u8			orig[32];
 };

 #define to_agp(chip)	container_of(chip, struct amd_gpio, chip)

 static int amd_gpio_request(struct gpio_chip *chip, unsigned offset)
 {
 	struct amd_gpio *agp = to_agp(chip);

 	agp->orig[offset] = ioread8(agp->pm + AMD_REG_GPIO(offset)) &
 		(AMD_GPIO_DEBOUNCE | AMD_GPIO_MODE_MASK | AMD_GPIO_X_MASK);

 	dev_dbg(&agp->pdev->dev, "Requested gpio %d, data %x\n", offset, agp->orig[offset]);

 	return 0;
 }

 static void amd_gpio_free(struct gpio_chip *chip, unsigned offset)
 {
 	struct amd_gpio *agp = to_agp(chip);

 	dev_dbg(&agp->pdev->dev, "Freed gpio %d, data %x\n", offset, agp->orig[offset]);

 	iowrite8(agp->orig[offset], agp->pm + AMD_REG_GPIO(offset));
 }

 static void amd_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
 	struct amd_gpio *agp = to_agp(chip);
 	u8 temp;
 	unsigned long flags;

 	spin_lock_irqsave(&agp->lock, flags);
 	temp = ioread8(agp->pm + AMD_REG_GPIO(offset));
 	temp = (temp & AMD_GPIO_DEBOUNCE) | AMD_GPIO_MODE_OUT | (value ? AMD_GPIO_X_OUT_HI : AMD_GPIO_X_OUT_LOW);
 	iowrite8(temp, agp->pm + AMD_REG_GPIO(offset));
 	spin_unlock_irqrestore(&agp->lock, flags);

 	dev_dbg(&agp->pdev->dev, "Setting gpio %d, value %d, reg=%02x\n", offset, !!value, temp);
 }

 static int amd_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
 	struct amd_gpio *agp = to_agp(chip);
 	u8 temp;

 	temp = ioread8(agp->pm + AMD_REG_GPIO(offset));

 	dev_dbg(&agp->pdev->dev, "Getting gpio %d, reg=%02x\n", offset, temp);

 	return (temp & AMD_GPIO_RTIN) ? 1 : 0;
 }

 static int amd_gpio_dirout(struct gpio_chip *chip, unsigned offset, int value)
 {
 	struct amd_gpio *agp = to_agp(chip);
 	u8 temp;
 	unsigned long flags;

 	spin_lock_irqsave(&agp->lock, flags);
 	temp = ioread8(agp->pm + AMD_REG_GPIO(offset));
 	temp = (temp & AMD_GPIO_DEBOUNCE) | AMD_GPIO_MODE_OUT | (value ? AMD_GPIO_X_OUT_HI : AMD_GPIO_X_OUT_LOW);
 	iowrite8(temp, agp->pm + AMD_REG_GPIO(offset));
 	spin_unlock_irqrestore(&agp->lock, flags);

 	dev_dbg(&agp->pdev->dev, "Dirout gpio %d, value %d, reg=%02x\n", offset, !!value, temp);

 	return 0;
 }

 static int amd_gpio_dirin(struct gpio_chip *chip, unsigned offset)
 {
 	struct amd_gpio *agp = to_agp(chip);
 	u8 temp;
 	unsigned long flags;

 	spin_lock_irqsave(&agp->lock, flags);
 	temp = ioread8(agp->pm + AMD_REG_GPIO(offset));
 	temp = (temp & AMD_GPIO_DEBOUNCE) | AMD_GPIO_MODE_IN;
 	iowrite8(temp, agp->pm + AMD_REG_GPIO(offset));
 	spin_unlock_irqrestore(&agp->lock, flags);

 	dev_dbg(&agp->pdev->dev, "Dirin gpio %d, reg=%02x\n", offset, temp);

 	return 0;
 }

 static struct amd_gpio gp = {
 	.chip = {
 		.label		= "AMD GPIO",
 		.owner		= THIS_MODULE,
 		.base		= -1,
 		.ngpio		= 32,
 		.request	= amd_gpio_request,
 		.free		= amd_gpio_free,
 		.set		= amd_gpio_set,
 		.get		= amd_gpio_get,
 		.direction_output = amd_gpio_dirout,
 		.direction_input = amd_gpio_dirin,
 	},
 };

 static int __init amd_gpio_init(void)
 {
 	int err = -ENODEV;
 	struct pci_dev *pdev = NULL;
 	const struct pci_device_id *ent;


 	/* We look for our device - AMD South Bridge
 	 * I don't know about a system with two such bridges,
 	 * so we can assume that there is max. one device.
 	 *
 	 * We can't use plain pci_driver mechanism,
 	 * as the device is really a multiple function device,
 	 * main driver that binds to the pci_device is an smbus
 	 * driver and have to find & bind to the device this way.
 	 */
 	for_each_pci_dev(pdev) {
 		ent = pci_match_id(pci_tbl, pdev);
 		if (ent)
 			goto found;
 	}
 	/* Device not found. */
 	goto out;

 found:
 	err = pci_read_config_dword(pdev, 0x58, &gp.pmbase);
 	if (err)
 		goto out;
 	err = -EIO;
 	gp.pmbase &= 0x0000FF00;
 	if (gp.pmbase == 0)
 		goto out;
 	if (!request_region(gp.pmbase + PMBASE_OFFSET, PMBASE_SIZE, "AMD GPIO")) {
 		dev_err(&pdev->dev, "AMD GPIO region 0x%x already in use!\n",
 			gp.pmbase + PMBASE_OFFSET);
 		err = -EBUSY;
 		goto out;
 	}
 	gp.pm = ioport_map(gp.pmbase + PMBASE_OFFSET, PMBASE_SIZE);
 	gp.pdev = pdev;
 	gp.chip.dev = &pdev->dev;

 	spin_lock_init(&gp.lock);

 	printk(KERN_INFO "AMD-8111 GPIO detected\n");
 	err = gpiochip_add(&gp.chip);
 	if (err) {
 		printk(KERN_ERR "GPIO registering failed (%d)\n",
 		       err);
 		ioport_unmap(gp.pm);
 		release_region(gp.pmbase + PMBASE_OFFSET, PMBASE_SIZE);
 		goto out;
 	}
 out:
 	return err;
 }

 static void __exit amd_gpio_exit(void)
 {
 	gpiochip_remove(&gp.chip);
 	ioport_unmap(gp.pm);
 	release_region(gp.pmbase + PMBASE_OFFSET, PMBASE_SIZE);
 }

 module_init(amd_gpio_init);
 module_exit(amd_gpio_exit);

 MODULE_AUTHOR("The Linux Kernel team");
 MODULE_DESCRIPTION("GPIO driver for AMD chipsets");
 MODULE_LICENSE("GPL");
	/*
	* GPIO driver for AMD 8111 south bridges
	*
	* Copyright (c) 2012 Dmitry Eremin-Solenikov
	*
	* Based on the AMD RNG driver:
	* Copyright 2005 (c) MontaVista Software, Inc.
	* with the majority of the code coming from:
	*
	* Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)
	* (c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com>
	*
	* derived from
	*
	* Hardware driver for the AMD 768 Random Number Generator (RNG)
	* (c) Copyright 2001 Red Hat Inc
	*
	* derived from
	*
	* Hardware driver for Intel i810 Random Number Generator (RNG)
	* Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
	* Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
	*
	* This file is licensed under the terms of the GNU General Public
	* License version 2. This program is licensed "as is" without any
	* warranty of any kind, whether express or implied.
	*/
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/gpio.h>
	#include <linux/pci.h>
	#include <linux/spinlock.h>

	#define PMBASE_OFFSET 0xb0
	#define PMBASE_SIZE 0x30

	#define AMD_REG_GPIO(i) (0x10 + (i))

	#define AMD_GPIO_LTCH_STS 0x40 /* Latch status, w1 */
	#define AMD_GPIO_RTIN 0x20 /* Real Time in, ro */
	#define AMD_GPIO_DEBOUNCE 0x10 /* Debounce, rw */
	#define AMD_GPIO_MODE_MASK 0x0c /* Pin Mode Select, rw */
	#define AMD_GPIO_MODE_IN 0x00
	#define AMD_GPIO_MODE_OUT 0x04
	/* Enable alternative (e.g. clkout, IRQ, etc) function of the pin */
	#define AMD_GPIO_MODE_ALTFN 0x08 /* Or 0x09 */
	#define AMD_GPIO_X_MASK 0x03 /* In/Out specific, rw */
	#define AMD_GPIO_X_IN_ACTIVEHI 0x01 /* Active High */
	#define AMD_GPIO_X_IN_LATCH 0x02 /* Latched version is selected */
	#define AMD_GPIO_X_OUT_LOW 0x00
	#define AMD_GPIO_X_OUT_HI 0x01
	#define AMD_GPIO_X_OUT_CLK0 0x02
	#define AMD_GPIO_X_OUT_CLK1 0x03

	/*
	* Data for PCI driver interface
	*
	* This data only exists for exporting the supported
	* PCI ids via MODULE_DEVICE_TABLE. We do not actually
	* register a pci_driver, because someone else might one day
	* want to register another driver on the same PCI id.
	*/
	static const struct pci_device_id pci_tbl[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS), 0 },
	{ 0, }, /* terminate list */
	};
	MODULE_DEVICE_TABLE(pci, pci_tbl);

	struct amd_gpio {
	struct gpio_chip chip;
	u32 pmbase;
	void __iomem *pm;
	struct pci_dev *pdev;
	spinlock_t lock; /* guards hw registers and orig table */
	u8 orig[32];
	};

	#define to_agp(chip) container_of(chip, struct amd_gpio, chip)

	static int amd_gpio_request(struct gpio_chip *chip, unsigned offset)
	{
	struct amd_gpio *agp = to_agp(chip);

	agp->orig[offset] = ioread8(agp->pm + AMD_REG_GPIO(offset)) &
	(AMD_GPIO_DEBOUNCE \| AMD_GPIO_MODE_MASK \| AMD_GPIO_X_MASK);

	dev_dbg(&agp->pdev->dev, "Requested gpio %d, data %x\n", offset, agp->orig[offset]);

	return 0;
	}

	static void amd_gpio_free(struct gpio_chip *chip, unsigned offset)
	{
	struct amd_gpio *agp = to_agp(chip);

	dev_dbg(&agp->pdev->dev, "Freed gpio %d, data %x\n", offset, agp->orig[offset]);

	iowrite8(agp->orig[offset], agp->pm + AMD_REG_GPIO(offset));
	}

	static void amd_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	{
	struct amd_gpio *agp = to_agp(chip);
	u8 temp;
	unsigned long flags;

	spin_lock_irqsave(&agp->lock, flags);
	temp = ioread8(agp->pm + AMD_REG_GPIO(offset));
	temp = (temp & AMD_GPIO_DEBOUNCE) \| AMD_GPIO_MODE_OUT \| (value ? AMD_GPIO_X_OUT_HI : AMD_GPIO_X_OUT_LOW);
	iowrite8(temp, agp->pm + AMD_REG_GPIO(offset));
	spin_unlock_irqrestore(&agp->lock, flags);

	dev_dbg(&agp->pdev->dev, "Setting gpio %d, value %d, reg=%02x\n", offset, !!value, temp);
	}

	static int amd_gpio_get(struct gpio_chip *chip, unsigned offset)
	{
	struct amd_gpio *agp = to_agp(chip);
	u8 temp;

	temp = ioread8(agp->pm + AMD_REG_GPIO(offset));

	dev_dbg(&agp->pdev->dev, "Getting gpio %d, reg=%02x\n", offset, temp);

	return (temp & AMD_GPIO_RTIN) ? 1 : 0;
	}

	static int amd_gpio_dirout(struct gpio_chip *chip, unsigned offset, int value)
	{
	struct amd_gpio *agp = to_agp(chip);
	u8 temp;
	unsigned long flags;

	spin_lock_irqsave(&agp->lock, flags);
	temp = ioread8(agp->pm + AMD_REG_GPIO(offset));
	temp = (temp & AMD_GPIO_DEBOUNCE) \| AMD_GPIO_MODE_OUT \| (value ? AMD_GPIO_X_OUT_HI : AMD_GPIO_X_OUT_LOW);
	iowrite8(temp, agp->pm + AMD_REG_GPIO(offset));
	spin_unlock_irqrestore(&agp->lock, flags);

	dev_dbg(&agp->pdev->dev, "Dirout gpio %d, value %d, reg=%02x\n", offset, !!value, temp);

	return 0;
	}

	static int amd_gpio_dirin(struct gpio_chip *chip, unsigned offset)
	{
	struct amd_gpio *agp = to_agp(chip);
	u8 temp;
	unsigned long flags;

	spin_lock_irqsave(&agp->lock, flags);
	temp = ioread8(agp->pm + AMD_REG_GPIO(offset));
	temp = (temp & AMD_GPIO_DEBOUNCE) \| AMD_GPIO_MODE_IN;
	iowrite8(temp, agp->pm + AMD_REG_GPIO(offset));
	spin_unlock_irqrestore(&agp->lock, flags);

	dev_dbg(&agp->pdev->dev, "Dirin gpio %d, reg=%02x\n", offset, temp);

	return 0;
	}

	static struct amd_gpio gp = {
	.chip = {
	.label = "AMD GPIO",
	.owner = THIS_MODULE,
	.base = -1,
	.ngpio = 32,
	.request = amd_gpio_request,
	.free = amd_gpio_free,
	.set = amd_gpio_set,
	.get = amd_gpio_get,
	.direction_output = amd_gpio_dirout,
	.direction_input = amd_gpio_dirin,
	},
	};

	static int __init amd_gpio_init(void)
	{
	int err = -ENODEV;
	struct pci_dev *pdev = NULL;
	const struct pci_device_id *ent;


	/* We look for our device - AMD South Bridge
	* I don't know about a system with two such bridges,
	* so we can assume that there is max. one device.
	*
	* We can't use plain pci_driver mechanism,
	* as the device is really a multiple function device,
	* main driver that binds to the pci_device is an smbus
	* driver and have to find & bind to the device this way.
	*/
	for_each_pci_dev(pdev) {
	ent = pci_match_id(pci_tbl, pdev);
	if (ent)
	goto found;
	}
	/* Device not found. */
	goto out;

	found:
	err = pci_read_config_dword(pdev, 0x58, &gp.pmbase);
	if (err)
	goto out;
	err = -EIO;
	gp.pmbase &= 0x0000FF00;
	if (gp.pmbase == 0)
	goto out;
	if (!request_region(gp.pmbase + PMBASE_OFFSET, PMBASE_SIZE, "AMD GPIO")) {
	dev_err(&pdev->dev, "AMD GPIO region 0x%x already in use!\n",
	gp.pmbase + PMBASE_OFFSET);
	err = -EBUSY;
	goto out;
	}
	gp.pm = ioport_map(gp.pmbase + PMBASE_OFFSET, PMBASE_SIZE);
	gp.pdev = pdev;
	gp.chip.dev = &pdev->dev;

	spin_lock_init(&gp.lock);

	printk(KERN_INFO "AMD-8111 GPIO detected\n");
	err = gpiochip_add(&gp.chip);
	if (err) {
	printk(KERN_ERR "GPIO registering failed (%d)\n",
	err);
	ioport_unmap(gp.pm);
	release_region(gp.pmbase + PMBASE_OFFSET, PMBASE_SIZE);
	goto out;
	}
	out:
	return err;
	}

	static void __exit amd_gpio_exit(void)
	{
	gpiochip_remove(&gp.chip);
	ioport_unmap(gp.pm);
	release_region(gp.pmbase + PMBASE_OFFSET, PMBASE_SIZE);
	}

	module_init(amd_gpio_init);
	module_exit(amd_gpio_exit);

	MODULE_AUTHOR("The Linux Kernel team");
	MODULE_DESCRIPTION("GPIO driver for AMD chipsets");
	MODULE_LICENSE("GPL");