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authorGrant Likely <grant.likely@secretlab.ca>2011-07-26 03:19:06 -0600
committerGrant Likely <grant.likely@secretlab.ca>2011-07-28 01:32:04 -0600
commit08a543ad33fc188650801bd36eed4ffe272643e1 (patch)
treecf2b41b922e77190425f999c2268f1558dd52d18 /include/linux/of_irq.h
parent5fd1a2ed0ec6fb5449c71a988cc15edb8671b3d0 (diff)
downloadlinux-stericsson-08a543ad33fc188650801bd36eed4ffe272643e1.tar.gz
irq: add irq_domain translation infrastructure
This patch adds irq_domain infrastructure for translating from hardware irq numbers to linux irqs. This is particularly important for architectures adding device tree support because the current implementation (excluding PowerPC and SPARC) cannot handle translation for more than a single interrupt controller. irq_domain supports device tree translation for any number of interrupt controllers. This patch converts x86, Microblaze, ARM and MIPS to use irq_domain for device tree irq translation. x86 is untested beyond compiling it, irq_domain is enabled for MIPS and Microblaze, but the old behaviour is preserved until the core code is modified to actually register an irq_domain yet. On ARM it works and is required for much of the new ARM device tree board support. PowerPC has /not/ been converted to use this new infrastructure. It is still missing some features before it can replace the virq infrastructure already in powerpc (see documentation on irq_domain_map/unmap for details). Followup patches will add the missing pieces and migrate PowerPC to use irq_domain. SPARC has its own method of managing interrupts from the device tree and is unaffected by this change. Acked-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'include/linux/of_irq.h')
-rw-r--r--include/linux/of_irq.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h
index e6955f5d1f08..cd2e61ce4e83 100644
--- a/include/linux/of_irq.h
+++ b/include/linux/of_irq.h
@@ -63,6 +63,9 @@ extern int of_irq_map_one(struct device_node *device, int index,
extern unsigned int irq_create_of_mapping(struct device_node *controller,
const u32 *intspec,
unsigned int intsize);
+#ifdef CONFIG_IRQ_DOMAIN
+extern void irq_dispose_mapping(unsigned int irq);
+#endif
extern int of_irq_to_resource(struct device_node *dev, int index,
struct resource *r);
extern int of_irq_count(struct device_node *dev);
@@ -70,6 +73,7 @@ extern int of_irq_to_resource_table(struct device_node *dev,
struct resource *res, int nr_irqs);
extern struct device_node *of_irq_find_parent(struct device_node *child);
+
#endif /* CONFIG_OF_IRQ */
#endif /* CONFIG_OF */
#endif /* __OF_IRQ_H */