[PATCH 13/16] add IRQ remapping

[Benjamin Herrenschmidt]

On Wed, 2006-11-15 at 19:18 +0900, Ishizaki Kou wrote:
> This patch adds irq remapping.
> On interrupt mechanism on Beat, when an irq outlet who has an id
> hich 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-2.6.19/arch/powerpc/kernel/irq.c
> diff -u linux-2.6.19/arch/powerpc/kernel/irq.c:1.1.1.2 linux-2.6.19/arch/powerpc/kernel/irq.c:1.4
> --- linux-2.6.19/arch/powerpc/kernel/irq.c:1.1.1.2	Tue Oct 17 08:40:57 2006
> +++ linux-2.6.19/arch/powerpc/kernel/irq.c	Mon Nov  6 22:04:23 2006
> @@ -534,6 +534,8 @@
>  	 */
>  	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;
>  	}
> Index: linux-2.6.19/include/asm-powerpc/irq.h
> diff -u linux-2.6.19/include/asm-powerpc/irq.h:1.1.1.2 linux-2.6.19/include/asm-powerpc/irq.h:1.3
> --- linux-2.6.19/include/asm-powerpc/irq.h:1.1.1.2	Tue Oct 17 08:44:31 2006
> +++ linux-2.6.19/include/asm-powerpc/irq.h	Tue Oct 17 13:22:53 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
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