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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/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/irq.h')
-rw-r--r--include/linux/irq.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 5f695041090c..87a06f345bd2 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -108,14 +108,18 @@ enum {
};
struct msi_desc;
+struct irq_domain;
/**
* struct irq_data - per irq and irq chip data passed down to chip functions
* @irq: interrupt number
+ * @hwirq: hardware interrupt number, local to the interrupt domain
* @node: node index useful for balancing
* @state_use_accessors: status information for irq chip functions.
* Use accessor functions to deal with it
* @chip: low level interrupt hardware access
+ * @domain: Interrupt translation domain; responsible for mapping
+ * between hwirq number and linux irq number.
* @handler_data: per-IRQ data for the irq_chip methods
* @chip_data: platform-specific per-chip private data for the chip
* methods, to allow shared chip implementations
@@ -128,9 +132,11 @@ struct msi_desc;
*/
struct irq_data {
unsigned int irq;
+ unsigned long hwirq;
unsigned int node;
unsigned int state_use_accessors;
struct irq_chip *chip;
+ struct irq_domain *domain;
void *handler_data;
void *chip_data;
struct msi_desc *msi_desc;