d7f8504d23
Instead of directly passing NULL to the various irq_domain functions, start by looking up the domain with a domain identifier.. As this identifier is permanently set to NULL, the lookup function will return the same value (no domain found) and the default will be used, preserving the current behaviour. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-and-tested-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: <linux-arm-kernel@lists.infradead.org> Cc: Tomasz Nowicki <tomasz.nowicki@linaro.org> Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> Cc: Graeme Gregory <graeme@xora.org.uk> Cc: Jake Oshins <jakeo@microsoft.com> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Link: http://lkml.kernel.org/r/1444737105-31573-10-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
/*
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* ACPI GSI IRQ layer
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*
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* Copyright (C) 2015 ARM Ltd.
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* Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/acpi.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/of.h>
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enum acpi_irq_model_id acpi_irq_model;
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static struct fwnode_handle *acpi_gsi_domain_id;
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static unsigned int acpi_gsi_get_irq_type(int trigger, int polarity)
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{
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switch (polarity) {
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case ACPI_ACTIVE_LOW:
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return trigger == ACPI_EDGE_SENSITIVE ?
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IRQ_TYPE_EDGE_FALLING :
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IRQ_TYPE_LEVEL_LOW;
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case ACPI_ACTIVE_HIGH:
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return trigger == ACPI_EDGE_SENSITIVE ?
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IRQ_TYPE_EDGE_RISING :
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IRQ_TYPE_LEVEL_HIGH;
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case ACPI_ACTIVE_BOTH:
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if (trigger == ACPI_EDGE_SENSITIVE)
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return IRQ_TYPE_EDGE_BOTH;
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default:
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return IRQ_TYPE_NONE;
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}
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}
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/**
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* acpi_gsi_to_irq() - Retrieve the linux irq number for a given GSI
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* @gsi: GSI IRQ number to map
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* @irq: pointer where linux IRQ number is stored
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*
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* irq location updated with irq value [>0 on success, 0 on failure]
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*
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* Returns: linux IRQ number on success (>0)
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* -EINVAL on failure
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*/
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int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
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{
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struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
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DOMAIN_BUS_ANY);
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*irq = irq_find_mapping(d, gsi);
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/*
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* *irq == 0 means no mapping, that should
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* be reported as a failure
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*/
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return (*irq > 0) ? *irq : -EINVAL;
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}
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EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
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/**
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* acpi_register_gsi() - Map a GSI to a linux IRQ number
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* @dev: device for which IRQ has to be mapped
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* @gsi: GSI IRQ number
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* @trigger: trigger type of the GSI number to be mapped
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* @polarity: polarity of the GSI to be mapped
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*
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* Returns: a valid linux IRQ number on success
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* -EINVAL on failure
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*/
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int acpi_register_gsi(struct device *dev, u32 gsi, int trigger,
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int polarity)
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{
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unsigned int irq;
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unsigned int irq_type = acpi_gsi_get_irq_type(trigger, polarity);
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struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
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DOMAIN_BUS_ANY);
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irq = irq_create_mapping(d, gsi);
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if (!irq)
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return -EINVAL;
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/* Set irq type if specified and different than the current one */
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if (irq_type != IRQ_TYPE_NONE &&
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irq_type != irq_get_trigger_type(irq))
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irq_set_irq_type(irq, irq_type);
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return irq;
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}
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EXPORT_SYMBOL_GPL(acpi_register_gsi);
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/**
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* acpi_unregister_gsi() - Free a GSI<->linux IRQ number mapping
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* @gsi: GSI IRQ number
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*/
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void acpi_unregister_gsi(u32 gsi)
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{
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struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
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DOMAIN_BUS_ANY);
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int irq = irq_find_mapping(d, gsi);
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irq_dispose_mapping(irq);
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}
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EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
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