[linux-2.6-block.git] / drivers / acpi / gsi.c

/*
 * ACPI GSI IRQ layer
 *
 * Copyright (C) 2015 ARM Ltd.
 * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
 *
 * 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.
 */
#include <linux/acpi.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/of.h>

enum acpi_irq_model_id acpi_irq_model;

static struct fwnode_handle *acpi_gsi_domain_id;

static unsigned int acpi_gsi_get_irq_type(int trigger, int polarity)
{
	switch (polarity) {
	case ACPI_ACTIVE_LOW:
		return trigger == ACPI_EDGE_SENSITIVE ?
		       IRQ_TYPE_EDGE_FALLING :
		       IRQ_TYPE_LEVEL_LOW;
	case ACPI_ACTIVE_HIGH:
		return trigger == ACPI_EDGE_SENSITIVE ?
		       IRQ_TYPE_EDGE_RISING :
		       IRQ_TYPE_LEVEL_HIGH;
	case ACPI_ACTIVE_BOTH:
		if (trigger == ACPI_EDGE_SENSITIVE)
			return IRQ_TYPE_EDGE_BOTH;
	default:
		return IRQ_TYPE_NONE;
	}
}

/**
 * acpi_gsi_to_irq() - Retrieve the linux irq number for a given GSI
 * @gsi: GSI IRQ number to map
 * @irq: pointer where linux IRQ number is stored
 *
 * irq location updated with irq value [>0 on success, 0 on failure]
 *
 * Returns: linux IRQ number on success (>0)
 *          -EINVAL on failure
 */
int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
{
	struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
							DOMAIN_BUS_ANY);

	*irq = irq_find_mapping(d, gsi);
	/*
	 * *irq == 0 means no mapping, that should
	 * be reported as a failure
	 */
	return (*irq > 0) ? *irq : -EINVAL;
}
EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);

/**
 * acpi_register_gsi() - Map a GSI to a linux IRQ number
 * @dev: device for which IRQ has to be mapped
 * @gsi: GSI IRQ number
 * @trigger: trigger type of the GSI number to be mapped
 * @polarity: polarity of the GSI to be mapped
 *
 * Returns: a valid linux IRQ number on success
 *          -EINVAL on failure
 */
int acpi_register_gsi(struct device *dev, u32 gsi, int trigger,
		      int polarity)
{
	unsigned int irq;
	unsigned int irq_type = acpi_gsi_get_irq_type(trigger, polarity);
	struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
							DOMAIN_BUS_ANY);

	irq = irq_create_mapping(d, gsi);
	if (!irq)
		return -EINVAL;

	/* Set irq type if specified and different than the current one */
	if (irq_type != IRQ_TYPE_NONE &&
		irq_type != irq_get_trigger_type(irq))
		irq_set_irq_type(irq, irq_type);
	return irq;
}
EXPORT_SYMBOL_GPL(acpi_register_gsi);

/**
 * acpi_unregister_gsi() - Free a GSI<->linux IRQ number mapping
 * @gsi: GSI IRQ number
 */
void acpi_unregister_gsi(u32 gsi)
{
	struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
							DOMAIN_BUS_ANY);
	int irq = irq_find_mapping(d, gsi);

	irq_dispose_mapping(irq);
}
EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
Commit	Line	Data
d8f4f161 LP	1	/*
	2	* ACPI GSI IRQ layer
	3	*
	4	* Copyright (C) 2015 ARM Ltd.
	5	* Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/acpi.h>
	12	#include <linux/irq.h>
	13	#include <linux/irqdomain.h>
d7f8504d	14	#include <linux/of.h>
d8f4f161 LP	15
	16	enum acpi_irq_model_id acpi_irq_model;
	17
d7f8504d MZ	18	static struct fwnode_handle *acpi_gsi_domain_id;
d7f8504d MZ	19
d8f4f161 LP	20	static unsigned int acpi_gsi_get_irq_type(int trigger, int polarity)
	21	{
	22	switch (polarity) {
	23	case ACPI_ACTIVE_LOW:
	24	return trigger == ACPI_EDGE_SENSITIVE ?
	25	IRQ_TYPE_EDGE_FALLING :
	26	IRQ_TYPE_LEVEL_LOW;
	27	case ACPI_ACTIVE_HIGH:
	28	return trigger == ACPI_EDGE_SENSITIVE ?
	29	IRQ_TYPE_EDGE_RISING :
	30	IRQ_TYPE_LEVEL_HIGH;
	31	case ACPI_ACTIVE_BOTH:
	32	if (trigger == ACPI_EDGE_SENSITIVE)
	33	return IRQ_TYPE_EDGE_BOTH;
	34	default:
	35	return IRQ_TYPE_NONE;
	36	}
	37	}
	38
	39	/**
	40	* acpi_gsi_to_irq() - Retrieve the linux irq number for a given GSI
	41	* @gsi: GSI IRQ number to map
	42	* @irq: pointer where linux IRQ number is stored
	43	*
	44	* irq location updated with irq value [>0 on success, 0 on failure]
	45	*
	46	* Returns: linux IRQ number on success (>0)
	47	* -EINVAL on failure
	48	*/
	49	int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
	50	{
d7f8504d MZ	51	struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
	52	DOMAIN_BUS_ANY);
	53
	54	*irq = irq_find_mapping(d, gsi);
d8f4f161 LP	55	/*
	56	* *irq == 0 means no mapping, that should
	57	* be reported as a failure
	58	*/
	59	return (irq > 0) ? irq : -EINVAL;
	60	}
	61	EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
	62
	63	/**
	64	* acpi_register_gsi() - Map a GSI to a linux IRQ number
	65	* @dev: device for which IRQ has to be mapped
	66	* @gsi: GSI IRQ number
	67	* @trigger: trigger type of the GSI number to be mapped
	68	* @polarity: polarity of the GSI to be mapped
	69	*
	70	* Returns: a valid linux IRQ number on success
	71	* -EINVAL on failure
	72	*/
	73	int acpi_register_gsi(struct device *dev, u32 gsi, int trigger,
	74	int polarity)
	75	{
	76	unsigned int irq;
	77	unsigned int irq_type = acpi_gsi_get_irq_type(trigger, polarity);
d7f8504d MZ	78	struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
d7f8504d MZ	79	DOMAIN_BUS_ANY);
d8f4f161	80
d7f8504d	81	irq = irq_create_mapping(d, gsi);
d8f4f161 LP	82	if (!irq)
	83	return -EINVAL;
	84
	85	/* Set irq type if specified and different than the current one */
	86	if (irq_type != IRQ_TYPE_NONE &&
	87	irq_type != irq_get_trigger_type(irq))
	88	irq_set_irq_type(irq, irq_type);
	89	return irq;
	90	}
	91	EXPORT_SYMBOL_GPL(acpi_register_gsi);
	92
	93	/**
	94	* acpi_unregister_gsi() - Free a GSI<->linux IRQ number mapping
	95	* @gsi: GSI IRQ number
	96	*/
	97	void acpi_unregister_gsi(u32 gsi)
	98	{
d7f8504d MZ	99	struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
	100	DOMAIN_BUS_ANY);
	101	int irq = irq_find_mapping(d, gsi);
d8f4f161 LP	102
	103	irq_dispose_mapping(irq);
	104	}
	105	EXPORT_SYMBOL_GPL(acpi_unregister_gsi);