feat(gicv3): introduce GIC component identification
The GIC specification describes ID registers in each GIC register frame
(PIDRx), which can be used to identify a GIC component. The Arm Ltd. GIC
implementations use certain ID values to identify the distributor, the
redistributors and other parts like ITSes.
Introduce a function that reads those part number IDs, which are spread
over two registers. The actual numbers are only meaningful in connection
with a certain GIC model, which would need to be checked beforehand, by
the caller.
Change-Id: Ia6ff326a1e8b12664e4637bc8e2683d2b5c7721c
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/include/drivers/arm/arm_gicv3_common.h b/include/drivers/arm/arm_gicv3_common.h
index e5df311..d1e93be 100644
--- a/include/drivers/arm/arm_gicv3_common.h
+++ b/include/drivers/arm/arm_gicv3_common.h
@@ -21,4 +21,8 @@
#define IIDR_MODEL_ARM_GIC_600AE U(0x0300043b)
#define IIDR_MODEL_ARM_GIC_700 U(0x0400043b)
+#define PIDR_COMPONENT_ARM_DIST U(0x492)
+#define PIDR_COMPONENT_ARM_REDIST U(0x493)
+#define PIDR_COMPONENT_ARM_ITS U(0x494)
+
#endif /* ARM_GICV3_COMMON_H */