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Add a SDRAM controller driver for the AST2700, derived from the
existing AST2700 controller code used by the Ibex SPL but adapted
to run from ARM U-Boot proper on the Cortex-A35 cores.
The DDR4/DDR5 controller and its DesignWare PHY are programmed by
the Ibex SPL before ARM U-Boot proper takes over. This driver
reads back the configuration left by the SPL, probes the
controller, and exposes ram_info (base and size, with the VGA
carve-out subtracted) via UCLASS_RAM so that dram_init() can
populate gd->ram_size.
The PHY firmware-load entry points (dwc_ddrphy_phyinit_userCustom_*)
are kept compiled but call a __weak fmc_hdr_get_prebuilt() stub
when ARM U-Boot proper is the caller; the real implementation is
provided by the Ibex SPL via the same fmc_hdr.h descriptor format
(here added for the ARM build).
Adds the supporting register-layout headers under
arch/arm/include/asm/arch-aspeed/:
- sdram.h: SDRAM controller and DWC PHY register definitions
- scu.h: SCU bits referenced by the SDRAM driver
- fmc_hdr.h: prebuilt-blob descriptor (binary-compatible with
arch/riscv/include/asm/arch-ast2700/fmc_hdr.h used
by the Ibex SPL)
Signed-off-by: Ryan Chen <[email protected]>
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