tree d185a5907abda0403916cc24fe8dfe78bc54cf03
parent 883322b9fd20321a22a37f08411379f7fed8312c
author Andre Przywara <andre.przywara@arm.com> 1585151438 +0000
committer Madhukar Pappireddy <madhukar.pappireddy@arm.com> 1591722349 +0000

GICv3: GIC-600: Detect GIC-600 at runtime

The only difference between GIC-500 and GIC-600 relevant to TF-A is the
differing power management sequence.
A certain GIC implementation is detectable at runtime, for instance by
checking the IIDR register. Let's add that test before initiating the
GIC-600 specific sequence, so the code can be used on both GIC-600 and
GIC-500 chips alike, without deciding on a GIC chip at compile time.

This means that the GIC-500 "driver" is now redundant. To allow minimal
platform support, add a switch to disable GIC-600 support.

Change-Id: I17ea97d9fb05874772ebaa13e6678b4ba3415557
Signed-off-by: Andre Przywara <andre.przywara@arm.com>