tree b75bab4a39a2be40f58a9d6daac4a208035300fe
parent e8184a47c9cc04380553114815356d1042a27788
author Paul Mundt <lethal@linux-sh.org> 1285240178 +0900
committer Paul Mundt <lethal@linux-sh.org> 1286208947 +0900

sh: intc: Implement reverse mapping for IRQs to per-controller IDs.

This implements a scheme roughly analogous to the PowerPC virtual to
hardware IRQ mapping, which we use for IRQ to per-controller ID mapping.
This makes it possible for drivers to use the IDs directly for lookup
instead of hardcoding the vector.

The main motivation for this work is as a building block for dynamically
allocating virtual IRQs for demuxing INTC events sharing a single INTEVT
in addition to a common masking source.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>