path: root/include
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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-04-19 17:29:42 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-04-23 11:04:29 +1000
commit3fca40c704dd013797f2c0c518f37cd2cc8e19fe (patch)
tree250169398a74aca872c11717135f84826cbfbdad /include
parent3a2b4f7c355ff1c97e4adebadf0a1aefd7c4518a (diff)
irq: Add IRQ_TYPE_DEFAULT for use by PIC drivers
This is meant typically to allow a PIC driver's irq domain map() callback to establish sane defaults for the interrupt (and make sure that the HW and the irq_desc are in sync as far as the trigger is concerned). The irq core may not call the set_trigger callback if it thinks the trigger is already set to the right setting, so we need to ensure new descriptors are properly synchronized with the hardware. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'include')
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 7810406f3d80..b27cfcfd3a59 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -49,6 +49,12 @@ typedef void (*irq_preflow_handler_t)(struct irq_data *data);
* IRQ_TYPE_LEVEL_LOW - low level triggered
* IRQ_TYPE_LEVEL_MASK - Mask to filter out the level bits
* IRQ_TYPE_SENSE_MASK - Mask for all the above bits
+ * IRQ_TYPE_DEFAULT - For use by some PICs to ask irq_set_type
+ * to setup the HW to a sane default (used
+ * by irqdomain map() callbacks to synchronize
+ * the HW state and SW flags for a newly
+ * allocated descriptor).
+ *
* IRQ_TYPE_PROBE - Special flag for probing in progress
* Bits which can be modified via irq_set/clear/modify_status_flags()
@@ -77,6 +83,7 @@ enum {
IRQ_TYPE_LEVEL_LOW = 0x00000008,
IRQ_TYPE_SENSE_MASK = 0x0000000f,
IRQ_TYPE_PROBE = 0x00000010,