[U-Boot] [U-Boot, v4, 50/66] rockchip: rk3368: add DRAM controller driver with DRAM initialisation

[Philipp Tomsich <philipp.tomsich@theobroma-systems.com>]

> This adds a DRAM controller driver for the RK3368 and places it in
> drivers/ram/rockchip (where the other DM-enabled DRAM controller
> drivers for rockchip devices should also be moved eventually).
> 
> At this stage, only the following feature-set is supported:
>  - DDR3
>  - 32-bit configuration (i.e. fully populated)
>  - dual-rank (i.e. no auto-detection of ranks)
>  - DDR3-1600K speed-bin
> 
> This driver expects to run from a TPL stage that will later return to
> the RK3368 BROM.  It communicates with later stages through the
> os_reg2 in the pmugrf (i.e. using the same mechanism as Rockchip's DDR
> init code).
> 
> Unlike other DMC drivers for RK32xx and RK33xx parts, the required
> timings are calculated within the driver based on a target frequency
> and a DDR3 speed-bin (only the DDR3-1600K speed-bin is support at this
> time).
> 
> The RK3368 also has the DDRC0_CON0 (DDR ch. 0, control-register 0)
> register for controlling the operation of its (single-channel) DRAM
> controller in the GRF block.  This provides for selecting DDR3, mobile
> DDR modes, and control low-power operation.
> As part of this change, DDRC0_CON0 is also added to the GRF structure
> definition (at offset 0x600).
> 
> 
> Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
> Reviewed-by: Simon Glass <sjg@chromium.org>
> ---
> 
> Changes in v4:
> - updates pctl and phy reset sequences per feedback from typ at rock-chips.com
> 
> Changes in v3:
> - correctly states the location of the driver in the commit message
> 
> Changes in v2: None
> 
>  arch/arm/include/asm/arch-rockchip/ddr_rk3368.h    |  187 ++++
>  arch/arm/include/asm/arch-rockchip/grf_rk3368.h    |    3 +
>  arch/arm/mach-rockchip/rk3368/Makefile             |    1 -
>  arch/arm/mach-rockchip/rk3368/sdram_rk3368.c       |   60 --
>  .../clock/rockchip,rk3368-dmc.txt                  |   67 ++
>  drivers/ram/Makefile                               |    2 +
>  drivers/ram/rockchip/Makefile                      |    7 +
>  drivers/ram/rockchip/dmc-rk3368.c                  | 1007 ++++++++++++++++++++
>  include/dt-bindings/memory/rk3368-dmc.h            |   30 +
>  9 files changed, 1303 insertions(+), 61 deletions(-)
>  create mode 100644 arch/arm/include/asm/arch-rockchip/ddr_rk3368.h
>  delete mode 100644 arch/arm/mach-rockchip/rk3368/sdram_rk3368.c
>  create mode 100644 doc/device-tree-bindings/clock/rockchip,rk3368-dmc.txt
>  create mode 100644 drivers/ram/rockchip/Makefile
>  create mode 100644 drivers/ram/rockchip/dmc-rk3368.c
>  create mode 100644 include/dt-bindings/memory/rk3368-dmc.h
> 

Applied to u-boot-rockchip, thanks!