rpi: move plat_helpers.S to common
The plat_helpers.S file was almost identical between its RPi3 and RPi4
versions. Unify the two files, moving it into the common/ directory.
This adds a plat_rpi_get_model() function, which can be used to trigger
RPi4 specific action, detected at runtime. We use that to do the RPi4
specific L2 cache initialisation.
Change-Id: I2295704fd6dde7c76fe83b6d98c7bf998d4bf074
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/plat/rpi/rpi3/include/platform_def.h b/plat/rpi/rpi3/include/platform_def.h
index 9cacd99..2bcf53e 100644
--- a/plat/rpi/rpi3/include/platform_def.h
+++ b/plat/rpi/rpi3/include/platform_def.h
@@ -24,7 +24,7 @@
#define PLATFORM_CLUSTER0_CORE_COUNT PLATFORM_MAX_CPUS_PER_CLUSTER
#define PLATFORM_CORE_COUNT PLATFORM_CLUSTER0_CORE_COUNT
-#define RPI3_PRIMARY_CPU U(0)
+#define RPI_PRIMARY_CPU U(0)
#define PLAT_MAX_PWR_LVL MPIDR_AFFLVL1
#define PLAT_NUM_PWR_DOMAINS (PLATFORM_CLUSTER_COUNT + \