[PATCH 0/4] Enable full UFS boot on Rockchip RK3576

[Alexey Charkov]

Rockchip RK3576 can load its bootloader from UFS among other options,
so this series adds the necessary bits and pieces to enable an end-to-end
boot from UFS (boot ROM -> SPL -> U-boot proper -> kernel).

To achieve the above, this series goes through the following:
 - Patch 1 adjusts the existing SPL function for loading FIT images so
   that it doesn't try to immediately read an image fragment into its
   ultimate load address, as this causes trouble with a load address
   in a memory segment inaccessible by the storage device's DMA
 - Patch 2 introduces arch-independent code to enable SPL images to use
   UFS devices, including build system tweaks and a function to locate
   a U-boot image at a fixed UFS offset
 - Patch 3 adds device-reset functionality to the Rockchip UFS glue code,
   which is required for (at least some) UFS modules to respond to
   controller commands upon initial enumeration
 - Patch 4 ties it all together for Rockchip RK3576

This has been tested on a FriendlyElec NanoPi M5 board with a Biwin
BWU3AKC46C256G UFS module. Note that booting directly from UFS masks the
issue which patch 3 aims to address, because the boot ROM initializes the
UFS module before handing over to U-boot. If, however, one boots SPL from
FSPI1 with the same driver code, the module fails to respond unless patch
3 is applied.

Patch 1 is necessary because at least on RK3576 the UFS controller cannot
directly write the first section of the ATF image to its required load
address (which happens to be in SRAM, not in system RAM). This is what the
current spl_fit code tries to do unfortunately, leaving the UFS controller
stuck in an error state. In this series I rely on the fact that all code
paths in spl_fit which follow the initial load do either a memmove or a
decompress operation, so the initial load address ultimately doesn't
matter. I thus replace it with the Kconfig specified base load address
unconditionally, on the assumption that this address is always accessible
for writes. The memmove operation down the line then ensures that the CPU
and not the DMA controller write the image to SRAM, which works.

Note that in my experience none of the RK3576 boards actually boot current
mainline U-boot versions without a single-word SRAM write before jumping
to DDR initialization, as done in Kwiboo's commit at [1]. Therefore, to
test this series I additionally applied commits ea2ebb491e2c..390668db9d13
from Kwiboo's rk3576 branch [2] (including ea2ebb491e2c), so any testers
might want to:

git cherry-pick a256b4182bd2..390668db9d13

from there before or after applying this series

[1] https://source.denx.de/u-boot/contributors/kwiboo/u-boot/-/commit/390668db9d13b2cd0ac0077c15edb4b575ee28f9
[2] https://source.denx.de/u-boot/contributors/kwiboo/u-boot/-/commits/rk3576?ref_type=heads

Signed-off-by: Alexey Charkov <alchark at gmail.com>
---
Alexey Charkov (4):
      common/spl: fit: Avoid directly loading images to load_addr
      spl: Make UFS available for SPL builds
      ufs: rockchip: Add device reset support
      rockchip: spl: Add support for booting from UFS

 MAINTAINERS                                  |  1 +
 arch/arm/dts/rk3576-u-boot.dtsi              | 13 +++++++-
 arch/arm/include/asm/arch-rockchip/bootrom.h |  1 +
 arch/arm/include/asm/spl.h                   |  1 +
 arch/arm/mach-rockchip/Kconfig               |  3 ++
 arch/arm/mach-rockchip/rk3576/rk3576.c       |  1 +
 arch/arm/mach-rockchip/spl-boot-order.c      | 14 ++++++++
 common/spl/Kconfig                           | 16 +++++++++
 common/spl/Makefile                          |  1 +
 common/spl/spl_fit.c                         |  6 +---
 common/spl/spl_ufs.c                         | 49 ++++++++++++++++++++++++++++
 drivers/Makefile                             |  1 +
 drivers/reset/Kconfig                        |  9 +++++
 drivers/reset/Makefile                       |  2 +-
 drivers/scsi/Makefile                        |  3 ++
 drivers/ufs/Kconfig                          |  1 +
 drivers/ufs/ufs-rockchip.c                   | 25 ++++++++++++++
 drivers/ufs/ufs-rockchip.h                   |  1 +
 lib/Makefile                                 |  1 +
 19 files changed, 142 insertions(+), 7 deletions(-)
---
base-commit: e09d04dae5aaef5cda6b648c9c0b8282fce05559
change-id: 20251210-rk3576-ufs-ac3bf4e87156

Best regards,
-- 
Alexey Charkov <alchark at gmail.com>