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irq: Add IRQ_TYPE_DEFAULT for use by PIC drivers

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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>
This commit is contained in:
Benjamin Herrenschmidt 2012-04-19 17:29:42 +00:00
parent 3a2b4f7c35
commit 3fca40c704
1 changed files with 7 additions and 0 deletions
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7
include/linux/irq.h
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@ -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_LEVEL_MASK = (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH),
IRQ_TYPE_SENSE_MASK = 0x0000000f,
IRQ_TYPE_DEFAULT = IRQ_TYPE_SENSE_MASK,
IRQ_TYPE_PROBE = 0x00000010,