sunxi: add R528/T113-s3/D1(s) DRAM initialisation code
The Allwinner R528/T113-s/D1/D1s SoCs all share the same die, so use the
same DRAM initialisation code.
Make use of prior art here and lift some code from awboot[1], which
carried init code based on earlier decompilation efforts, but with a
GPL2 license tag.
This code has been heavily reworked and cleaned up, to match previous
DRAM routines for other SoCs, and also to be closer to U-Boot's coding
style and support routines.
The actual DRAM chip timing parameters are included in the main file,
since they cover all DRAM types, and are protected by a new Kconfig
CONFIG_SUNXI_DRAM_TYPE symbol, which allows the compiler to pick only
the relevant settings, at build time.
The relevant DRAM chips/board specific configuration parameters are
delivered via Kconfig, so this code here should work for all supported
SoCs and DRAM chips combinations.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Tested-by: Sam Edwards <CFSworks@gmail.com>
diff --git a/drivers/ram/sunxi/Makefile b/drivers/ram/sunxi/Makefile
new file mode 100644
index 0000000..86ea0b9
--- /dev/null
+++ b/drivers/ram/sunxi/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+obj-$(CONFIG_DRAM_SUN20I_D1) += dram_sun20i_d1.o