Commit 19c4f5f7 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Thomas Gleixner
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x86: dtb: Add irq domain abstraction 



The here introduced irq_domain abstraction represents a generic irq
controller. It is a subset of powerpc's irq_host which is going to be
renamed to irq_domain and then become generic. This implementation will
be removed once it is generic.

The xlate callback is resposible to parse irq informations like irq type
and number and returns the hardware irq number which is reported by the
hardware as active.

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: default avatarDirk Brandewie <dirk.brandewie@gmail.com>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Cc: sodaville@linutronix.de
Cc: devicetree-discuss@lists.ozlabs.org
LKML-Reference: <1298405266-1624-5-git-send-email-bigeasy@linutronix.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent df2634f4

arch/x86/include/asm/irq_controller.h

0 → 100644
+12 −0
Original line number Diff line number Diff line 
#ifndef __IRQ_CONTROLLER__

#define __IRQ_CONTROLLER__



struct irq_domain {

	int (*xlate)(struct irq_domain *h, const u32 *intspec, u32 intsize,

			u32 *out_hwirq, u32 *out_type);

	void *priv;

	struct device_node *controller;

	struct list_head l;

};



#endif

arch/x86/include/asm/prom.h

+2 −0
Original line number Diff line number Diff line
@@ -20,9 +20,11 @@ 
#include <asm/irq.h>

#include <asm/atomic.h>

#include <asm/setup.h>

#include <asm/irq_controller.h>



#ifdef CONFIG_OF

extern void add_dtb(u64 data);

void add_interrupt_host(struct irq_domain *ih);

#else

static inline void add_dtb(u64 data) { }

#endif

arch/x86/kernel/devicetree.c

+45 −1
Original line number Diff line number Diff line
@@ -3,19 +3,63 @@ 
 */

#include <linux/bootmem.h>

#include <linux/io.h>

#include <linux/interrupt.h>

#include <linux/list.h>

#include <linux/of.h>

#include <linux/of_fdt.h>

#include <linux/of_platform.h>

#include <linux/slab.h>



#include <asm/irq_controller.h>



char __initdata cmd_line[COMMAND_LINE_SIZE];

static LIST_HEAD(irq_domains);

static DEFINE_RAW_SPINLOCK(big_irq_lock);



void add_interrupt_host(struct irq_domain *ih)

{

	unsigned long flags;



	raw_spin_lock_irqsave(&big_irq_lock, flags);

	list_add(&ih->l, &irq_domains);

	raw_spin_unlock_irqrestore(&big_irq_lock, flags);

}



static struct irq_domain *get_ih_from_node(struct device_node *controller)

{

	struct irq_domain *ih, *found = NULL;

	unsigned long flags;



	raw_spin_lock_irqsave(&big_irq_lock, flags);

	list_for_each_entry(ih, &irq_domains, l) {

		if (ih->controller ==  controller) {

			found = ih;

			break;

		}

	}

	raw_spin_unlock_irqrestore(&big_irq_lock, flags);

	return found;

}



unsigned int irq_create_of_mapping(struct device_node *controller,

				   const u32 *intspec, unsigned int intsize)

{

	return intspec[0];

	struct irq_domain *ih;

	u32 virq, type;

	int ret;



	ih = get_ih_from_node(controller);

	if (!ih)

		return 0;

	ret = ih->xlate(ih, intspec, intsize, &virq, &type);

	if (ret)

		return ret;

	if (type == IRQ_TYPE_NONE)

		return virq;

	/* set the mask if it is different from current */

	if (type == (irq_to_desc(virq)->status & IRQF_TRIGGER_MASK))

		set_irq_type(virq, type);

	return virq;

}

EXPORT_SYMBOL_GPL(irq_create_of_mapping);

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