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Commit ee51de56 authored by Michael Ellerman's avatar Michael Ellerman Committed by Paul Mackerras
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[POWERPC] Add irq_create_direct_mapping() 



This patch adds irq_create_direct_mapping().  This routine is
an alternative to irq_create_mapping(), for irq controllers that
can use linux virq numbers directly as hardware numbers.

Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 6fde40f3

arch/powerpc/kernel/irq.c

+24 −0
Original line number Diff line number Diff line
@@ -616,6 +616,30 @@ static int irq_setup_virq(struct irq_host *host, unsigned int virq, 
	return 0;

}



unsigned int irq_create_direct_mapping(struct irq_host *host)

{

	unsigned int virq;



	if (host == NULL)

		host = irq_default_host;



	BUG_ON(host == NULL);

	WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP);



	virq = irq_alloc_virt(host, 1, 0);

	if (virq == NO_IRQ) {

		pr_debug("irq: create_direct virq allocation failed\n");

		return NO_IRQ;

	}



	pr_debug("irq: create_direct obtained virq %d\n", virq);



	if (irq_setup_virq(host, virq, virq))

		return NO_IRQ;



	return virq;

}



unsigned int irq_create_mapping(struct irq_host *host,

				irq_hw_number_t hwirq)

{

include/asm-powerpc/irq.h

+9 −0
Original line number Diff line number Diff line
@@ -223,6 +223,15 @@ extern void irq_dispose_mapping(unsigned int virq); 
extern unsigned int irq_find_mapping(struct irq_host *host,

				     irq_hw_number_t hwirq);



/**

 * irq_create_direct_mapping - Allocate a virq for direct mapping

 * @host: host to allocate the virq for or NULL for default host

 *

 * This routine is used for irq controllers which can choose the hardware

 * interrupt numbers they generate. In such a case it's simplest to use

 * the linux virq as the hardware interrupt number.

 */

extern unsigned int irq_create_direct_mapping(struct irq_host *host);



/**

 * irq_radix_revmap - Find a linux virq from a hw irq number.