[PATCH 5/19] powerpc: add IRQ remapping hook

[Ishizaki Kou]

This patch adds irq remapping hook. On interrupt mechanism on Beat,
when an irq outlet who has an id which is formerly used is created,
remapping the irq is required.

Signed-off-by: Kou Ishizaki <kou.ishizaki at toshiba.co.jp>
Acked-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---

Index: linux-powerpc-git/include/asm-powerpc/irq.h
diff -u linux-powerpc-git/include/asm-powerpc/irq.h:1.1.1.1 linux-powerpc-git/include/asm-powerpc/irq.h:1.2
--- linux-powerpc-git/include/asm-powerpc/irq.h:1.1.1.1	Wed Dec  6 08:24:04 2006
+++ linux-powerpc-git/include/asm-powerpc/irq.h	Wed Dec  6 08:43:16 2006
@@ -89,6 +89,9 @@
 	/* Dispose of such a mapping */
 	void (*unmap)(struct irq_host *h, unsigned int virq);
 
+	/* Update of such a mapping  */
+	void (*remap)(struct irq_host *h, unsigned int virq, irq_hw_number_t hw);
+
 	/* Translate device-tree interrupt specifier from raw format coming
 	 * from the firmware to a irq_hw_number_t (interrupt line number) and
 	 * type (sense) that can be passed to set_irq_type(). In the absence
Index: linux-powerpc-git/arch/powerpc/kernel/irq.c
diff -u linux-powerpc-git/arch/powerpc/kernel/irq.c:1.1.1.1 linux-powerpc-git/arch/powerpc/kernel/irq.c:1.2
--- linux-powerpc-git/arch/powerpc/kernel/irq.c:1.1.1.1	Wed Dec  6 08:25:43 2006
+++ linux-powerpc-git/arch/powerpc/kernel/irq.c	Wed Dec  6 08:43:14 2006
@@ -604,6 +604,8 @@
 	 */
 	virq = irq_find_mapping(host, hwirq);
 	if (virq != IRQ_NONE) {
+		if (host->ops->remap)
+			host->ops->remap(host, virq, hwirq);
 		pr_debug("irq: -> existing mapping on virq %d\n", virq);
 		return virq;
 	}