Commit 4af8be67 authored by Mark Brown's avatar Mark Brown
Browse files

regmap: Convert regmap_irq to use irq_domain 



This gets us up to date with the recommended current kernel infrastructure
and should transparently give us device tree interrupt bindings for any
devices using the framework. If an explicit IRQ mapping is passed in then
a legacy interrupt range is created, otherwise a simple linear mapping is
used. Previously a mapping was mandatory so existing drivers should not
be affected.

A function regmap_irq_get_virq() is provided to allow drivers to map
individual IRQs which should be used in preference to the existing
regmap_irq_chip_get_base() which is only valid if a legacy IRQ range is
provided.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 06e65cb3

drivers/base/regmap/regmap-irq.c

+70 −27
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/regmap.h>

#include <linux/irq.h>

#include <linux/interrupt.h>

#include <linux/irqdomain.h>

#include <linux/slab.h>



#include "internal.h"
@@ -26,6 +27,7 @@ struct regmap_irq_chip_data { 
	struct regmap_irq_chip *chip;



	int irq_base;

	struct irq_domain *domain;



	void *status_reg_buf;

	unsigned int *status_buf;
@@ -37,7 +39,7 @@ static inline const 
struct regmap_irq *irq_to_regmap_irq(struct regmap_irq_chip_data *data,

				     int irq)

{

	return &data->chip->irqs[irq - data->irq_base];

	return &data->chip->irqs[irq];

}



static void regmap_irq_lock(struct irq_data *data)
@@ -74,7 +76,7 @@ static void regmap_irq_enable(struct irq_data *data) 
{

	struct regmap_irq_chip_data *d = irq_data_get_irq_chip_data(data);

	struct regmap *map = d->map;

	const struct regmap_irq *irq_data = irq_to_regmap_irq(d, data->irq);

	const struct regmap_irq *irq_data = irq_to_regmap_irq(d, data->hwirq);



	d->mask_buf[irq_data->reg_offset / map->reg_stride] &= ~irq_data->mask;

}
@@ -83,7 +85,7 @@ static void regmap_irq_disable(struct irq_data *data) 
{

	struct regmap_irq_chip_data *d = irq_data_get_irq_chip_data(data);

	struct regmap *map = d->map;

	const struct regmap_irq *irq_data = irq_to_regmap_irq(d, data->irq);

	const struct regmap_irq *irq_data = irq_to_regmap_irq(d, data->hwirq);



	d->mask_buf[irq_data->reg_offset / map->reg_stride] |= irq_data->mask;

}
@@ -153,7 +155,7 @@ static irqreturn_t regmap_irq_thread(int irq, void *d) 
	for (i = 0; i < chip->num_irqs; i++) {

		if (data->status_buf[chip->irqs[i].reg_offset /

				     map->reg_stride] & chip->irqs[i].mask) {

			handle_nested_irq(data->irq_base + i);

			handle_nested_irq(irq_find_mapping(data->domain, i));

			handled = true;

		}

	}
@@ -164,6 +166,31 @@ static irqreturn_t regmap_irq_thread(int irq, void *d) 
		return IRQ_NONE;

}



static int regmap_irq_map(struct irq_domain *h, unsigned int virq,

			  irq_hw_number_t hw)

{

	struct regmap_irq_chip_data *data = h->host_data;



	irq_set_chip_data(virq, data);

	irq_set_chip_and_handler(virq, &regmap_irq_chip, handle_edge_irq);

	irq_set_nested_thread(virq, 1);



	/* ARM needs us to explicitly flag the IRQ as valid

	 * and will set them noprobe when we do so. */

#ifdef CONFIG_ARM

	set_irq_flags(virq, IRQF_VALID);

#else

	irq_set_noprobe(virq);

#endif



	return 0;

}



static struct irq_domain_ops regmap_domain_ops = {

	.map	= regmap_irq_map,

	.xlate	= irq_domain_xlate_twocell,

};



/**

 * regmap_add_irq_chip(): Use standard regmap IRQ controller handling

 *
@@ -184,7 +211,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags, 
			struct regmap_irq_chip_data **data)

{

	struct regmap_irq_chip_data *d;

	int cur_irq, i;

	int i;

	int ret = -ENOMEM;



	for (i = 0; i < chip->num_irqs; i++) {
@@ -195,12 +222,14 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags, 
			return -EINVAL;

	}



	if (irq_base) {

		irq_base = irq_alloc_descs(irq_base, 0, chip->num_irqs, 0);

		if (irq_base < 0) {

			dev_warn(map->dev, "Failed to allocate IRQs: %d\n",

				 irq_base);

			return irq_base;

		}

	}



	d = kzalloc(sizeof(*d), GFP_KERNEL);

	if (!d)
@@ -249,33 +278,31 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags, 
		}

	}



	/* Register them with genirq */

	for (cur_irq = irq_base;

	     cur_irq < chip->num_irqs + irq_base;

	     cur_irq++) {

		irq_set_chip_data(cur_irq, d);

		irq_set_chip_and_handler(cur_irq, &regmap_irq_chip,

					 handle_edge_irq);

		irq_set_nested_thread(cur_irq, 1);



		/* ARM needs us to explicitly flag the IRQ as valid

		 * and will set them noprobe when we do so. */

#ifdef CONFIG_ARM

		set_irq_flags(cur_irq, IRQF_VALID);

#else

		irq_set_noprobe(cur_irq);

#endif

	if (irq_base)

		d->domain = irq_domain_add_legacy(map->dev->of_node,

						  chip->num_irqs, irq_base, 0,

						  &regmap_domain_ops, d);

	else

		d->domain = irq_domain_add_linear(map->dev->of_node,

						  chip->num_irqs,

						  &regmap_domain_ops, d);

	if (!d->domain) {

		dev_err(map->dev, "Failed to create IRQ domain\n");

		ret = -ENOMEM;

		goto err_alloc;

	}



	ret = request_threaded_irq(irq, NULL, regmap_irq_thread, irq_flags,

				   chip->name, d);

	if (ret != 0) {

		dev_err(map->dev, "Failed to request IRQ %d: %d\n", irq, ret);

		goto err_alloc;

		goto err_domain;

	}



	return 0;



err_domain:

	/* Should really dispose of the domain but... */

err_alloc:

	kfree(d->mask_buf_def);

	kfree(d->mask_buf);
@@ -298,6 +325,7 @@ void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *d) 
		return;



	free_irq(irq, d);

	/* We should unmap the domain but... */

	kfree(d->mask_buf_def);

	kfree(d->mask_buf);

	kfree(d->status_reg_buf);
@@ -315,6 +343,21 @@ EXPORT_SYMBOL_GPL(regmap_del_irq_chip); 
 */

int regmap_irq_chip_get_base(struct regmap_irq_chip_data *data)

{

	WARN_ON(!data->irq_base);

	return data->irq_base;

}

EXPORT_SYMBOL_GPL(regmap_irq_chip_get_base);



/**

 * regmap_irq_get_virq(): Map an interrupt on a chip to a virtual IRQ

 *

 * Useful for drivers to request their own IRQs.

 *

 * @data: regmap_irq controller to operate on.

 * @irq: index of the interrupt requested in the chip IRQs

 */

int regmap_irq_get_virq(struct regmap_irq_chip_data *data, int irq)

{

	return irq_create_mapping(data->domain, irq);

}

EXPORT_SYMBOL_GPL(regmap_irq_get_virq);

drivers/mfd/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -376,6 +376,7 @@ config PMIC_DA9052 


config MFD_DA9052_SPI

	bool "Support Dialog Semiconductor DA9052/53 PMIC variants with SPI"

	select IRQ_DOMAIN

	select REGMAP_SPI

	select REGMAP_IRQ

	select PMIC_DA9052
@@ -388,6 +389,7 @@ config MFD_DA9052_SPI 


config MFD_DA9052_I2C

	bool "Support Dialog Semiconductor DA9052/53 PMIC variants with I2C"

	select IRQ_DOMAIN

	select REGMAP_I2C

	select REGMAP_IRQ

	select PMIC_DA9052
@@ -558,6 +560,7 @@ config MFD_WM8994 
	bool "Support Wolfson Microelectronics WM8994"

	select MFD_CORE

	select REGMAP_I2C

	select IRQ_DOMAIN

	select REGMAP_IRQ

	depends on I2C=y && GENERIC_HARDIRQS

	help

include/linux/regmap.h

+1 −0
Original line number Diff line number Diff line
@@ -245,6 +245,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags, 
			struct regmap_irq_chip_data **data);

void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *data);

int regmap_irq_chip_get_base(struct regmap_irq_chip_data *data);

int regmap_irq_get_virq(struct regmap_irq_chip_data *data, int irq);



#else

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