PSCI: Implement platform compatibility layer
The new PSCI topology framework and PSCI extended State framework introduces
a breaking change in the platform port APIs. To ease the migration of the
platform ports to the new porting interface, a compatibility layer is
introduced which essentially defines the new platform API in terms of the
old API. The old PSCI helpers to retrieve the power-state, its associated
fields and the highest coordinated physical OFF affinity level of a core
are also implemented for compatibility. This allows the existing
platform ports to work with the new PSCI framework without significant
rework. This layer will be enabled by default once the switch to the new
PSCI framework is done and is controlled by the build flag ENABLE_PLAT_COMPAT.
Change-Id: I4b17cac3a4f3375910a36dba6b03d8f1700d07e3
diff --git a/Makefile b/Makefile
index b1c42eb..c1e9617 100644
--- a/Makefile
+++ b/Makefile
@@ -169,6 +169,20 @@
include ${PLAT_MAKEFILE_FULL}
+# Disable the Platform Compatibility layer till the new PSCI framework is
+# introduced.
+ENABLE_PLAT_COMPAT := 0
+
+# If the platform has not defined ENABLE_PLAT_COMPAT, then enable it by default
+ifndef ENABLE_PLAT_COMPAT
+ENABLE_PLAT_COMPAT := 1
+endif
+
+# Include the platform compatibility helpers for PSCI
+ifneq (${ENABLE_PLAT_COMPAT}, 0)
+include plat/compat/plat_compat.mk
+endif
+
# Include the CPU specific operations makefile. By default all CPU errata
# workarounds and CPU specifc optimisations are disabled. This can be
# overridden by the platform.
@@ -288,6 +302,10 @@
$(eval $(call assert_boolean,PROGRAMMABLE_RESET_ADDRESS))
$(eval $(call add_define,PROGRAMMABLE_RESET_ADDRESS))
+# Process ENABLE_PLAT_COMPAT flag
+$(eval $(call assert_boolean,ENABLE_PLAT_COMPAT))
+$(eval $(call add_define,ENABLE_PLAT_COMPAT))
+
ASFLAGS += -nostdinc -ffreestanding -Wa,--fatal-warnings \
-Werror -Wmissing-include-dirs \
-mgeneral-regs-only -D__ASSEMBLY__ \