mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 15:43:59 +08:00
55a93417c2
acpi_gsi_get_irq_type could be use out of GSI purpose. Rename and make it available as a resource function. Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
99 lines
2.6 KiB
C
99 lines
2.6 KiB
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;
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct irq_fwspec fwspec;
|
|
|
|
if (WARN_ON(!acpi_gsi_domain_id)) {
|
|
pr_warn("GSI: No registered irqchip, giving up\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
fwspec.fwnode = acpi_gsi_domain_id;
|
|
fwspec.param[0] = gsi;
|
|
fwspec.param[1] = acpi_dev_get_irq_type(trigger, polarity);
|
|
fwspec.param_count = 2;
|
|
|
|
return irq_create_fwspec_mapping(&fwspec);
|
|
}
|
|
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);
|
|
|
|
/**
|
|
* acpi_set_irq_model - Setup the GSI irqdomain information
|
|
* @model: the value assigned to acpi_irq_model
|
|
* @fwnode: the irq_domain identifier for mapping and looking up
|
|
* GSI interrupts
|
|
*/
|
|
void __init acpi_set_irq_model(enum acpi_irq_model_id model,
|
|
struct fwnode_handle *fwnode)
|
|
{
|
|
acpi_irq_model = model;
|
|
acpi_gsi_domain_id = fwnode;
|
|
}
|