Commit 46e589a3 authored by Marc Zyngier's avatar Marc Zyngier Committed by Rafael J. Wysocki

irqchip / ACPI: Add probing infrastructure for ACPI-based irqchips

DT enjoys a rather nice probing infrastructure for irqchips, while
ACPI is so far stuck into a very distant past.

This patch introduces a declarative API, allowing irqchips to be
self-contained and be called when a particular entry is matched
in the MADT table.
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Reviewed-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Tested-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent e647b532
......@@ -10,15 +10,4 @@ struct pt_regs;
extern void migrate_irqs(void);
extern void set_handle_irq(void (*handle_irq)(struct pt_regs *));
static inline void acpi_irq_init(void)
{
/*
* Hardcode ACPI IRQ chip initialization to GICv2 for now.
* Proper irqchip infrastructure will be implemented along with
* incoming GICv2m|GICv3|ITS bits.
*/
acpi_gic_init();
}
#define acpi_irq_init acpi_irq_init
#endif
......@@ -8,7 +8,7 @@
* warranty of any kind, whether express or implied.
*/
#include <linux/acpi_irq.h>
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/of_irq.h>
#include <linux/irqchip.h>
......@@ -27,6 +27,8 @@ extern struct of_device_id __irqchip_of_table[];
void __init irqchip_init(void)
{
of_irq_init(__irqchip_of_table);
acpi_irq_init();
#if defined(CONFIG_ARM64) && defined(CONFIG_ACPI)
acpi_gic_init(); /* Temporary hack */
#endif
acpi_probe_device_table(irqchip);
}
......@@ -524,6 +524,7 @@
CPUIDLE_METHOD_OF_TABLES() \
KERNEL_DTB() \
IRQCHIP_OF_MATCH_TABLE() \
ACPI_PROBE_TABLE(irqchip) \
EARLYCON_TABLE() \
EARLYCON_OF_TABLES()
......
#ifndef _LINUX_ACPI_IRQ_H
#define _LINUX_ACPI_IRQ_H
#include <linux/irq.h>
#ifndef acpi_irq_init
static inline void acpi_irq_init(void) { }
#endif
#endif /* _LINUX_ACPI_IRQ_H */
......@@ -11,6 +11,7 @@
#ifndef _LINUX_IRQCHIP_H
#define _LINUX_IRQCHIP_H
#include <linux/acpi.h>
#include <linux/of.h>
/*
......@@ -25,6 +26,22 @@
*/
#define IRQCHIP_DECLARE(name, compat, fn) OF_DECLARE_2(irqchip, name, compat, fn)
/*
* This macro must be used by the different irqchip drivers to declare
* the association between their version and their initialization function.
*
* @name: name that must be unique accross all IRQCHIP_ACPI_DECLARE of the
* same file.
* @subtable: Subtable to be identified in MADT
* @validate: Function to be called on that subtable to check its validity.
* Can be NULL.
* @data: data to be checked by the validate function.
* @fn: initialization function
*/
#define IRQCHIP_ACPI_DECLARE(name, subtable, validate, data, fn) \
ACPI_DECLARE_PROBE_ENTRY(irqchip, name, ACPI_SIG_MADT, \
subtable, validate, data, fn)
#ifdef CONFIG_IRQCHIP
void irqchip_init(void);
#else
......
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