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>
diff --git a/include/drivers/arm/gicv3.h b/include/drivers/arm/gicv3.h
index 03596b9..77dc350 100644
--- a/include/drivers/arm/gicv3.h
+++ b/include/drivers/arm/gicv3.h
@@ -222,6 +222,14 @@
#define TYPER_PPI_NUM_SHIFT U(27)
#define TYPER_PPI_NUM_MASK U(0x1f)
+/* GICR_IIDR bit definitions */
+#define IIDR_PRODUCT_ID_MASK 0xff000000
+#define IIDR_VARIANT_MASK 0x000f0000
+#define IIDR_REVISION_MASK 0x0000f000
+#define IIDR_IMPLEMENTER_MASK 0x00000fff
+#define IIDR_MODEL_MASK (IIDR_PRODUCT_ID_MASK | \
+ IIDR_IMPLEMENTER_MASK)
+
/*******************************************************************************
* GICv3 and 3.1 CPU interface registers & constants
******************************************************************************/