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: 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>

1 files changed, 45 insertions, 1 deletions

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 0b8f0daef933..ef98e4edada1 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -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);