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/rpi4/platform.mk b/plat/rpi/rpi4/platform.mk
index 49e78df..0744bce 100644
--- a/plat/rpi/rpi4/platform.mk
+++ b/plat/rpi/rpi4/platform.mk
@@ -16,7 +16,7 @@
${XLAT_TABLES_LIB_SRCS}
BL31_SOURCES += lib/cpus/aarch64/cortex_a72.S \
- plat/rpi/rpi4/aarch64/plat_helpers.S \
+ plat/rpi/common/aarch64/plat_helpers.S \
plat/rpi/rpi4/aarch64/armstub8_header.S \
drivers/arm/gic/common/gic_common.c \
drivers/arm/gic/v2/gicv2_helpers.c \