drivers/ssb/driver_gpio.c - kernel/msm-4.9 - Gitiles

 /*
  * Sonics Silicon Backplane
  * GPIO driver
  *
  * Copyright 2011, Broadcom Corporation
  * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
  *
  * Licensed under the GNU/GPL. See COPYING for details.
  */

 #include <linux/gpio.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/irqdomain.h>
 #include <linux/export.h>
 #include <linux/ssb/ssb.h>

 #include "ssb_private.h"


 /**************************************************
  * Shared
  **************************************************/

 static struct ssb_bus *ssb_gpio_get_bus(struct gpio_chip *chip)
 {
 	return container_of(chip, struct ssb_bus, gpio);
 }

 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
 static int ssb_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
 {
 	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

 	if (bus->bustype == SSB_BUSTYPE_SSB)
 		return irq_find_mapping(bus->irq_domain, gpio);
 	else
 		return -EINVAL;
 }
 #endif

 /**************************************************
  * ChipCommon
  **************************************************/

 static int ssb_gpio_chipco_get_value(struct gpio_chip *chip, unsigned gpio)
 {
 	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

 	return !!ssb_chipco_gpio_in(&bus->chipco, 1 << gpio);
 }

 static void ssb_gpio_chipco_set_value(struct gpio_chip *chip, unsigned gpio,
 				      int value)
 {
 	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

 	ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
 }

 static int ssb_gpio_chipco_direction_input(struct gpio_chip *chip,
 					   unsigned gpio)
 {
 	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

 	ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 0);
 	return 0;
 }

 static int ssb_gpio_chipco_direction_output(struct gpio_chip *chip,
 					    unsigned gpio, int value)
 {
 	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

 	ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 1 << gpio);
 	ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
 	return 0;
 }

 static int ssb_gpio_chipco_request(struct gpio_chip *chip, unsigned gpio)
 {
 	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

 	ssb_chipco_gpio_control(&bus->chipco, 1 << gpio, 0);
 	/* clear pulldown */
 	ssb_chipco_gpio_pulldown(&bus->chipco, 1 << gpio, 0);
 	/* Set pullup */
 	ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 1 << gpio);

 	return 0;
 }

 static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned gpio)
 {
 	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

 	/* clear pullup */
 	ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0);
 }

 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
 static void ssb_gpio_irq_chipco_mask(struct irq_data *d)
 {
 	struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
 	int gpio = irqd_to_hwirq(d);

 	ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), 0);
 }

 static void ssb_gpio_irq_chipco_unmask(struct irq_data *d)
 {
 	struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
 	int gpio = irqd_to_hwirq(d);
 	u32 val = ssb_chipco_gpio_in(&bus->chipco, BIT(gpio));

 	ssb_chipco_gpio_polarity(&bus->chipco, BIT(gpio), val);
 	ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), BIT(gpio));
 }

 static struct irq_chip ssb_gpio_irq_chipco_chip = {
 	.name		= "SSB-GPIO-CC",
 	.irq_mask	= ssb_gpio_irq_chipco_mask,
 	.irq_unmask	= ssb_gpio_irq_chipco_unmask,
 };

 static irqreturn_t ssb_gpio_irq_chipco_handler(int irq, void *dev_id)
 {
 	struct ssb_bus *bus = dev_id;
 	struct ssb_chipcommon *chipco = &bus->chipco;
 	u32 val = chipco_read32(chipco, SSB_CHIPCO_GPIOIN);
 	u32 mask = chipco_read32(chipco, SSB_CHIPCO_GPIOIRQ);
 	u32 pol = chipco_read32(chipco, SSB_CHIPCO_GPIOPOL);
 	unsigned long irqs = (val ^ pol) & mask;
 	int gpio;

 	if (!irqs)
 		return IRQ_NONE;

 	for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
 		generic_handle_irq(ssb_gpio_to_irq(&bus->gpio, gpio));
 	ssb_chipco_gpio_polarity(chipco, irqs, val & irqs);

 	return IRQ_HANDLED;
 }

 static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
 {
 	struct ssb_chipcommon *chipco = &bus->chipco;
 	struct gpio_chip *chip = &bus->gpio;
 	int gpio, hwirq, err;

 	if (bus->bustype != SSB_BUSTYPE_SSB)
 		return 0;

 	bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
 						&irq_domain_simple_ops, chipco);
 	if (!bus->irq_domain) {
 		err = -ENODEV;
 		goto err_irq_domain;
 	}
 	for (gpio = 0; gpio < chip->ngpio; gpio++) {
 		int irq = irq_create_mapping(bus->irq_domain, gpio);

 		irq_set_chip_data(irq, bus);
 		irq_set_chip_and_handler(irq, &ssb_gpio_irq_chipco_chip,
 					 handle_simple_irq);
 	}

 	hwirq = ssb_mips_irq(bus->chipco.dev) + 2;
 	err = request_irq(hwirq, ssb_gpio_irq_chipco_handler, IRQF_SHARED,
 			  "gpio", bus);
 	if (err)
 		goto err_req_irq;

 	ssb_chipco_gpio_intmask(&bus->chipco, ~0, 0);
 	chipco_set32(chipco, SSB_CHIPCO_IRQMASK, SSB_CHIPCO_IRQ_GPIO);

 	return 0;

 err_req_irq:
 	for (gpio = 0; gpio < chip->ngpio; gpio++) {
 		int irq = irq_find_mapping(bus->irq_domain, gpio);

 		irq_dispose_mapping(irq);
 	}
 	irq_domain_remove(bus->irq_domain);
 err_irq_domain:
 	return err;
 }

 static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
 {
 	struct ssb_chipcommon *chipco = &bus->chipco;
 	struct gpio_chip *chip = &bus->gpio;
 	int gpio;

 	if (bus->bustype != SSB_BUSTYPE_SSB)
 		return;

 	chipco_mask32(chipco, SSB_CHIPCO_IRQMASK, ~SSB_CHIPCO_IRQ_GPIO);
 	free_irq(ssb_mips_irq(bus->chipco.dev) + 2, chipco);
 	for (gpio = 0; gpio < chip->ngpio; gpio++) {
 		int irq = irq_find_mapping(bus->irq_domain, gpio);

 		irq_dispose_mapping(irq);
 	}
 	irq_domain_remove(bus->irq_domain);
 }
 #else
 static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
 {
 	return 0;
 }

 static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
 {
 }
 #endif

 static int ssb_gpio_chipco_init(struct ssb_bus *bus)
 {
 	struct gpio_chip *chip = &bus->gpio;
 	int err;

 	chip->label		= "ssb_chipco_gpio";
 	chip->owner		= THIS_MODULE;
 	chip->request		= ssb_gpio_chipco_request;
 	chip->free		= ssb_gpio_chipco_free;
 	chip->get		= ssb_gpio_chipco_get_value;
 	chip->set		= ssb_gpio_chipco_set_value;
 	chip->direction_input	= ssb_gpio_chipco_direction_input;
 	chip->direction_output	= ssb_gpio_chipco_direction_output;
 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
 	chip->to_irq		= ssb_gpio_to_irq;
 #endif
 	chip->ngpio		= 16;
 	/* There is just one SoC in one device and its GPIO addresses should be
 	 * deterministic to address them more easily. The other buses could get
 	 * a random base number. */
 	if (bus->bustype == SSB_BUSTYPE_SSB)
 		chip->base		= 0;
 	else
 		chip->base		= -1;

 	err = ssb_gpio_irq_chipco_domain_init(bus);
 	if (err)
 		return err;

 	err = gpiochip_add(chip);
 	if (err) {
 		ssb_gpio_irq_chipco_domain_exit(bus);
 		return err;
 	}

 	return 0;
 }

 /**************************************************
  * EXTIF
  **************************************************/

 #ifdef CONFIG_SSB_DRIVER_EXTIF

 static int ssb_gpio_extif_get_value(struct gpio_chip *chip, unsigned gpio)
 {
 	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

 	return !!ssb_extif_gpio_in(&bus->extif, 1 << gpio);
 }

 static void ssb_gpio_extif_set_value(struct gpio_chip *chip, unsigned gpio,
 				     int value)
 {
 	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

 	ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
 }

 static int ssb_gpio_extif_direction_input(struct gpio_chip *chip,
 					  unsigned gpio)
 {
 	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

 	ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 0);
 	return 0;
 }

 static int ssb_gpio_extif_direction_output(struct gpio_chip *chip,
 					   unsigned gpio, int value)
 {
 	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

 	ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 1 << gpio);
 	ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
 	return 0;
 }

 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
 static void ssb_gpio_irq_extif_mask(struct irq_data *d)
 {
 	struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
 	int gpio = irqd_to_hwirq(d);

 	ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), 0);
 }

 static void ssb_gpio_irq_extif_unmask(struct irq_data *d)
 {
 	struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
 	int gpio = irqd_to_hwirq(d);
 	u32 val = ssb_extif_gpio_in(&bus->extif, BIT(gpio));

 	ssb_extif_gpio_polarity(&bus->extif, BIT(gpio), val);
 	ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), BIT(gpio));
 }

 static struct irq_chip ssb_gpio_irq_extif_chip = {
 	.name		= "SSB-GPIO-EXTIF",
 	.irq_mask	= ssb_gpio_irq_extif_mask,
 	.irq_unmask	= ssb_gpio_irq_extif_unmask,
 };

 static irqreturn_t ssb_gpio_irq_extif_handler(int irq, void *dev_id)
 {
 	struct ssb_bus *bus = dev_id;
 	struct ssb_extif *extif = &bus->extif;
 	u32 val = ssb_read32(extif->dev, SSB_EXTIF_GPIO_IN);
 	u32 mask = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTMASK);
 	u32 pol = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTPOL);
 	unsigned long irqs = (val ^ pol) & mask;
 	int gpio;

 	if (!irqs)
 		return IRQ_NONE;

 	for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
 		generic_handle_irq(ssb_gpio_to_irq(&bus->gpio, gpio));
 	ssb_extif_gpio_polarity(extif, irqs, val & irqs);

 	return IRQ_HANDLED;
 }

 static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
 {
 	struct ssb_extif *extif = &bus->extif;
 	struct gpio_chip *chip = &bus->gpio;
 	int gpio, hwirq, err;

 	if (bus->bustype != SSB_BUSTYPE_SSB)
 		return 0;

 	bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
 						&irq_domain_simple_ops, extif);
 	if (!bus->irq_domain) {
 		err = -ENODEV;
 		goto err_irq_domain;
 	}
 	for (gpio = 0; gpio < chip->ngpio; gpio++) {
 		int irq = irq_create_mapping(bus->irq_domain, gpio);

 		irq_set_chip_data(irq, bus);
 		irq_set_chip_and_handler(irq, &ssb_gpio_irq_extif_chip,
 					 handle_simple_irq);
 	}

 	hwirq = ssb_mips_irq(bus->extif.dev) + 2;
 	err = request_irq(hwirq, ssb_gpio_irq_extif_handler, IRQF_SHARED,
 			  "gpio", bus);
 	if (err)
 		goto err_req_irq;

 	ssb_extif_gpio_intmask(&bus->extif, ~0, 0);

 	return 0;

 err_req_irq:
 	for (gpio = 0; gpio < chip->ngpio; gpio++) {
 		int irq = irq_find_mapping(bus->irq_domain, gpio);

 		irq_dispose_mapping(irq);
 	}
 	irq_domain_remove(bus->irq_domain);
 err_irq_domain:
 	return err;
 }

 static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
 {
 	struct ssb_extif *extif = &bus->extif;
 	struct gpio_chip *chip = &bus->gpio;
 	int gpio;

 	if (bus->bustype != SSB_BUSTYPE_SSB)
 		return;

 	free_irq(ssb_mips_irq(bus->extif.dev) + 2, extif);
 	for (gpio = 0; gpio < chip->ngpio; gpio++) {
 		int irq = irq_find_mapping(bus->irq_domain, gpio);

 		irq_dispose_mapping(irq);
 	}
 	irq_domain_remove(bus->irq_domain);
 }
 #else
 static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
 {
 	return 0;
 }

 static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
 {
 }
 #endif

 static int ssb_gpio_extif_init(struct ssb_bus *bus)
 {
 	struct gpio_chip *chip = &bus->gpio;
 	int err;

 	chip->label		= "ssb_extif_gpio";
 	chip->owner		= THIS_MODULE;
 	chip->get		= ssb_gpio_extif_get_value;
 	chip->set		= ssb_gpio_extif_set_value;
 	chip->direction_input	= ssb_gpio_extif_direction_input;
 	chip->direction_output	= ssb_gpio_extif_direction_output;
 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
 	chip->to_irq		= ssb_gpio_to_irq;
 #endif
 	chip->ngpio		= 5;
 	/* There is just one SoC in one device and its GPIO addresses should be
 	 * deterministic to address them more easily. The other buses could get
 	 * a random base number. */
 	if (bus->bustype == SSB_BUSTYPE_SSB)
 		chip->base		= 0;
 	else
 		chip->base		= -1;

 	err = ssb_gpio_irq_extif_domain_init(bus);
 	if (err)
 		return err;

 	err = gpiochip_add(chip);
 	if (err) {
 		ssb_gpio_irq_extif_domain_exit(bus);
 		return err;
 	}

 	return 0;
 }

 #else
 static int ssb_gpio_extif_init(struct ssb_bus *bus)
 {
 	return -ENOTSUPP;
 }
 #endif

 /**************************************************
  * Init
  **************************************************/

 int ssb_gpio_init(struct ssb_bus *bus)
 {
 	if (ssb_chipco_available(&bus->chipco))
 		return ssb_gpio_chipco_init(bus);
 	else if (ssb_extif_available(&bus->extif))
 		return ssb_gpio_extif_init(bus);
 	else
 		SSB_WARN_ON(1);

 	return -1;
 }

 int ssb_gpio_unregister(struct ssb_bus *bus)
 {
 	if (ssb_chipco_available(&bus->chipco) ||
 	    ssb_extif_available(&bus->extif)) {
 		return gpiochip_remove(&bus->gpio);
 	} else {
 		SSB_WARN_ON(1);
 	}

 	return -1;
 }
	/*
	* Sonics Silicon Backplane
	* GPIO driver
	*
	* Copyright 2011, Broadcom Corporation
	* Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
	*
	* Licensed under the GNU/GPL. See COPYING for details.
	*/

	#include <linux/gpio.h>
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/irqdomain.h>
	#include <linux/export.h>
	#include <linux/ssb/ssb.h>

	#include "ssb_private.h"


	/**************************************************
	* Shared
	**************************************************/

	static struct ssb_bus ssb_gpio_get_bus(struct gpio_chip chip)
	{
	return container_of(chip, struct ssb_bus, gpio);
	}

	#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
	static int ssb_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
	{
	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

	if (bus->bustype == SSB_BUSTYPE_SSB)
	return irq_find_mapping(bus->irq_domain, gpio);
	else
	return -EINVAL;
	}
	#endif

	/**************************************************
	* ChipCommon
	**************************************************/

	static int ssb_gpio_chipco_get_value(struct gpio_chip *chip, unsigned gpio)
	{
	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

	return !!ssb_chipco_gpio_in(&bus->chipco, 1 << gpio);
	}

	static void ssb_gpio_chipco_set_value(struct gpio_chip *chip, unsigned gpio,
	int value)
	{
	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

	ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
	}

	static int ssb_gpio_chipco_direction_input(struct gpio_chip *chip,
	unsigned gpio)
	{
	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

	ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 0);
	return 0;
	}

	static int ssb_gpio_chipco_direction_output(struct gpio_chip *chip,
	unsigned gpio, int value)
	{
	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

	ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 1 << gpio);
	ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
	return 0;
	}

	static int ssb_gpio_chipco_request(struct gpio_chip *chip, unsigned gpio)
	{
	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

	ssb_chipco_gpio_control(&bus->chipco, 1 << gpio, 0);
	/* clear pulldown */
	ssb_chipco_gpio_pulldown(&bus->chipco, 1 << gpio, 0);
	/* Set pullup */
	ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 1 << gpio);

	return 0;
	}

	static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned gpio)
	{
	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

	/* clear pullup */
	ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0);
	}

	#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
	static void ssb_gpio_irq_chipco_mask(struct irq_data *d)
	{
	struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
	int gpio = irqd_to_hwirq(d);

	ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), 0);
	}

	static void ssb_gpio_irq_chipco_unmask(struct irq_data *d)
	{
	struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
	int gpio = irqd_to_hwirq(d);
	u32 val = ssb_chipco_gpio_in(&bus->chipco, BIT(gpio));

	ssb_chipco_gpio_polarity(&bus->chipco, BIT(gpio), val);
	ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), BIT(gpio));
	}

	static struct irq_chip ssb_gpio_irq_chipco_chip = {
	.name = "SSB-GPIO-CC",
	.irq_mask = ssb_gpio_irq_chipco_mask,
	.irq_unmask = ssb_gpio_irq_chipco_unmask,
	};

	static irqreturn_t ssb_gpio_irq_chipco_handler(int irq, void *dev_id)
	{
	struct ssb_bus *bus = dev_id;
	struct ssb_chipcommon *chipco = &bus->chipco;
	u32 val = chipco_read32(chipco, SSB_CHIPCO_GPIOIN);
	u32 mask = chipco_read32(chipco, SSB_CHIPCO_GPIOIRQ);
	u32 pol = chipco_read32(chipco, SSB_CHIPCO_GPIOPOL);
	unsigned long irqs = (val ^ pol) & mask;
	int gpio;

	if (!irqs)
	return IRQ_NONE;

	for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
	generic_handle_irq(ssb_gpio_to_irq(&bus->gpio, gpio));
	ssb_chipco_gpio_polarity(chipco, irqs, val & irqs);

	return IRQ_HANDLED;
	}

	static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
	{
	struct ssb_chipcommon *chipco = &bus->chipco;
	struct gpio_chip *chip = &bus->gpio;
	int gpio, hwirq, err;

	if (bus->bustype != SSB_BUSTYPE_SSB)
	return 0;

	bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
	&irq_domain_simple_ops, chipco);
	if (!bus->irq_domain) {
	err = -ENODEV;
	goto err_irq_domain;
	}
	for (gpio = 0; gpio < chip->ngpio; gpio++) {
	int irq = irq_create_mapping(bus->irq_domain, gpio);

	irq_set_chip_data(irq, bus);
	irq_set_chip_and_handler(irq, &ssb_gpio_irq_chipco_chip,
	handle_simple_irq);
	}

	hwirq = ssb_mips_irq(bus->chipco.dev) + 2;
	err = request_irq(hwirq, ssb_gpio_irq_chipco_handler, IRQF_SHARED,
	"gpio", bus);
	if (err)
	goto err_req_irq;

	ssb_chipco_gpio_intmask(&bus->chipco, ~0, 0);
	chipco_set32(chipco, SSB_CHIPCO_IRQMASK, SSB_CHIPCO_IRQ_GPIO);

	return 0;

	err_req_irq:
	for (gpio = 0; gpio < chip->ngpio; gpio++) {
	int irq = irq_find_mapping(bus->irq_domain, gpio);

	irq_dispose_mapping(irq);
	}
	irq_domain_remove(bus->irq_domain);
	err_irq_domain:
	return err;
	}

	static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
	{
	struct ssb_chipcommon *chipco = &bus->chipco;
	struct gpio_chip *chip = &bus->gpio;
	int gpio;

	if (bus->bustype != SSB_BUSTYPE_SSB)
	return;

	chipco_mask32(chipco, SSB_CHIPCO_IRQMASK, ~SSB_CHIPCO_IRQ_GPIO);
	free_irq(ssb_mips_irq(bus->chipco.dev) + 2, chipco);
	for (gpio = 0; gpio < chip->ngpio; gpio++) {
	int irq = irq_find_mapping(bus->irq_domain, gpio);

	irq_dispose_mapping(irq);
	}
	irq_domain_remove(bus->irq_domain);
	}
	#else
	static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
	{
	return 0;
	}

	static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
	{
	}
	#endif

	static int ssb_gpio_chipco_init(struct ssb_bus *bus)
	{
	struct gpio_chip *chip = &bus->gpio;
	int err;

	chip->label = "ssb_chipco_gpio";
	chip->owner = THIS_MODULE;
	chip->request = ssb_gpio_chipco_request;
	chip->free = ssb_gpio_chipco_free;
	chip->get = ssb_gpio_chipco_get_value;
	chip->set = ssb_gpio_chipco_set_value;
	chip->direction_input = ssb_gpio_chipco_direction_input;
	chip->direction_output = ssb_gpio_chipco_direction_output;
	#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
	chip->to_irq = ssb_gpio_to_irq;
	#endif
	chip->ngpio = 16;
	/* There is just one SoC in one device and its GPIO addresses should be
	* deterministic to address them more easily. The other buses could get
	* a random base number. */
	if (bus->bustype == SSB_BUSTYPE_SSB)
	chip->base = 0;
	else
	chip->base = -1;

	err = ssb_gpio_irq_chipco_domain_init(bus);
	if (err)
	return err;

	err = gpiochip_add(chip);
	if (err) {
	ssb_gpio_irq_chipco_domain_exit(bus);
	return err;
	}

	return 0;
	}

	/**************************************************
	* EXTIF
	**************************************************/

	#ifdef CONFIG_SSB_DRIVER_EXTIF

	static int ssb_gpio_extif_get_value(struct gpio_chip *chip, unsigned gpio)
	{
	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

	return !!ssb_extif_gpio_in(&bus->extif, 1 << gpio);
	}

	static void ssb_gpio_extif_set_value(struct gpio_chip *chip, unsigned gpio,
	int value)
	{
	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

	ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
	}

	static int ssb_gpio_extif_direction_input(struct gpio_chip *chip,
	unsigned gpio)
	{
	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

	ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 0);
	return 0;
	}

	static int ssb_gpio_extif_direction_output(struct gpio_chip *chip,
	unsigned gpio, int value)
	{
	struct ssb_bus *bus = ssb_gpio_get_bus(chip);

	ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 1 << gpio);
	ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
	return 0;
	}

	#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
	static void ssb_gpio_irq_extif_mask(struct irq_data *d)
	{
	struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
	int gpio = irqd_to_hwirq(d);

	ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), 0);
	}

	static void ssb_gpio_irq_extif_unmask(struct irq_data *d)
	{
	struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
	int gpio = irqd_to_hwirq(d);
	u32 val = ssb_extif_gpio_in(&bus->extif, BIT(gpio));

	ssb_extif_gpio_polarity(&bus->extif, BIT(gpio), val);
	ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), BIT(gpio));
	}

	static struct irq_chip ssb_gpio_irq_extif_chip = {
	.name = "SSB-GPIO-EXTIF",
	.irq_mask = ssb_gpio_irq_extif_mask,
	.irq_unmask = ssb_gpio_irq_extif_unmask,
	};

	static irqreturn_t ssb_gpio_irq_extif_handler(int irq, void *dev_id)
	{
	struct ssb_bus *bus = dev_id;
	struct ssb_extif *extif = &bus->extif;
	u32 val = ssb_read32(extif->dev, SSB_EXTIF_GPIO_IN);
	u32 mask = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTMASK);
	u32 pol = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTPOL);
	unsigned long irqs = (val ^ pol) & mask;
	int gpio;

	if (!irqs)
	return IRQ_NONE;

	for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
	generic_handle_irq(ssb_gpio_to_irq(&bus->gpio, gpio));
	ssb_extif_gpio_polarity(extif, irqs, val & irqs);

	return IRQ_HANDLED;
	}

	static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
	{
	struct ssb_extif *extif = &bus->extif;
	struct gpio_chip *chip = &bus->gpio;
	int gpio, hwirq, err;

	if (bus->bustype != SSB_BUSTYPE_SSB)
	return 0;

	bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
	&irq_domain_simple_ops, extif);
	if (!bus->irq_domain) {
	err = -ENODEV;
	goto err_irq_domain;
	}
	for (gpio = 0; gpio < chip->ngpio; gpio++) {
	int irq = irq_create_mapping(bus->irq_domain, gpio);

	irq_set_chip_data(irq, bus);
	irq_set_chip_and_handler(irq, &ssb_gpio_irq_extif_chip,
	handle_simple_irq);
	}

	hwirq = ssb_mips_irq(bus->extif.dev) + 2;
	err = request_irq(hwirq, ssb_gpio_irq_extif_handler, IRQF_SHARED,
	"gpio", bus);
	if (err)
	goto err_req_irq;

	ssb_extif_gpio_intmask(&bus->extif, ~0, 0);

	return 0;

	err_req_irq:
	for (gpio = 0; gpio < chip->ngpio; gpio++) {
	int irq = irq_find_mapping(bus->irq_domain, gpio);

	irq_dispose_mapping(irq);
	}
	irq_domain_remove(bus->irq_domain);
	err_irq_domain:
	return err;
	}

	static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
	{
	struct ssb_extif *extif = &bus->extif;
	struct gpio_chip *chip = &bus->gpio;
	int gpio;

	if (bus->bustype != SSB_BUSTYPE_SSB)
	return;

	free_irq(ssb_mips_irq(bus->extif.dev) + 2, extif);
	for (gpio = 0; gpio < chip->ngpio; gpio++) {
	int irq = irq_find_mapping(bus->irq_domain, gpio);

	irq_dispose_mapping(irq);
	}
	irq_domain_remove(bus->irq_domain);
	}
	#else
	static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
	{
	return 0;
	}

	static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
	{
	}
	#endif

	static int ssb_gpio_extif_init(struct ssb_bus *bus)
	{
	struct gpio_chip *chip = &bus->gpio;
	int err;

	chip->label = "ssb_extif_gpio";
	chip->owner = THIS_MODULE;
	chip->get = ssb_gpio_extif_get_value;
	chip->set = ssb_gpio_extif_set_value;
	chip->direction_input = ssb_gpio_extif_direction_input;
	chip->direction_output = ssb_gpio_extif_direction_output;
	#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
	chip->to_irq = ssb_gpio_to_irq;
	#endif
	chip->ngpio = 5;
	/* There is just one SoC in one device and its GPIO addresses should be
	* deterministic to address them more easily. The other buses could get
	* a random base number. */
	if (bus->bustype == SSB_BUSTYPE_SSB)
	chip->base = 0;
	else
	chip->base = -1;

	err = ssb_gpio_irq_extif_domain_init(bus);
	if (err)
	return err;

	err = gpiochip_add(chip);
	if (err) {
	ssb_gpio_irq_extif_domain_exit(bus);
	return err;
	}

	return 0;
	}

	#else
	static int ssb_gpio_extif_init(struct ssb_bus *bus)
	{
	return -ENOTSUPP;
	}
	#endif

	/**************************************************
	* Init
	**************************************************/

	int ssb_gpio_init(struct ssb_bus *bus)
	{
	if (ssb_chipco_available(&bus->chipco))
	return ssb_gpio_chipco_init(bus);
	else if (ssb_extif_available(&bus->extif))
	return ssb_gpio_extif_init(bus);
	else
	SSB_WARN_ON(1);

	return -1;
	}

	int ssb_gpio_unregister(struct ssb_bus *bus)
	{
	if (ssb_chipco_available(&bus->chipco) \|\|
	ssb_extif_available(&bus->extif)) {
	return gpiochip_remove(&bus->gpio);
	} else {
	SSB_WARN_ON(1);
	}

	return -1;
	}