106 lines
2.8 KiB
C
106 lines
2.8 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>
|
||
|
|
|
||
|
|
enum acpi_irq_model_id acpi_irq_model;
|
||
|
|
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Only default domain is supported at present, always find
|
||
|
|
* the mapping corresponding to default domain by passing NULL
|
||
|
|
* as irq_domain parameter
|
||
|
|
*/
|
||
|
|
*irq = irq_find_mapping(NULL, 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);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* There is no way at present to look-up the IRQ domain on ACPI,
|
||
|
|
* hence always create mapping referring to the default domain
|
||
|
|
* by passing NULL as irq_domain parameter
|
||
|
|
*/
|
||
|
|
irq = irq_create_mapping(NULL, 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)
|
||
|
|
{
|
||
|
|
int irq = irq_find_mapping(NULL, gsi);
|
||
|
|
|
||
|
|
irq_dispose_mapping(irq);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
|