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x86: dtb: Add irq domain abstraction

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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: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Acked-by: Grant 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: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2011-02-22 21:07:39 +01:00 committed by Thomas Gleixner
parent df2634f43f
commit 19c4f5f7f7
3 changed files with 59 additions and 1 deletions
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12
arch/x86/include/asm/irq_controller.h Normal file
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@ -0,0 +1,12 @@
#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

2
arch/x86/include/asm/prom.h
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@ -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

46
arch/x86/kernel/devicetree.c
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@ -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);