[PATCH v2 0/5] stm32mp: Enable OP-TEE and TZC support in SPL

[Alexandru Gagniuc]

The purpose of this series is to allow booting an OP-TEE image from
SPL, by corectly configuring the TrustZone (TZC) memory regions.

Although TZC400 is a generic silicon logic that could apply to other
mach- families, support is currently restricted to stm32mp. I have
neither a feasible way nor interest in validating this for other
chips. It's fairly trivial to move the code from mach- to arch/,
should another use case arise.

The configuration of the memory regions is devicetree-driven, so there
isn't much to hardcode, However the delineation between OP-TEE secure
memory and shared memory is not given in the devicetree. This is the
one thing that has to be hardcoded.

Although a variable CONFIG_OPTEE_TZDRAM_SIZE exists which advertises
to do exactly the above, it is not suitable. This variable is used in
u-boot proper, and is dependent on lib/optee being enabled.
CONFIG_SPL_OPTEE, used herein, is independent of lib/optee. Thus,
CONFIG_OPTEE_TZDRAM_SIZE is not guaranteed to exist

Changes since v1:
  - Removed "Weak functions are stupid" comment
  - Addressed blank line complaints from checkpatch

Alexandru Gagniuc (5):
  spl: mmc: Support OP-TEE payloads in Falcon mode
  spl: Introduce spl_board_prepare_for_optee() hook
  arm: stm32mp: Implement support for TZC 400 controller
  stm32mp1: spl: Configure TrustZone controller for OP-TEE
  ARM: dts: stm32mp: Add OP-TEE reserved memory to SPL dtb

 arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi |   3 +
 arch/arm/mach-stm32mp/Makefile           |   1 +
 arch/arm/mach-stm32mp/include/mach/tzc.h |  33 ++++++
 arch/arm/mach-stm32mp/spl.c              |  84 ++++++++++++++
 arch/arm/mach-stm32mp/tzc400.c           | 133 +++++++++++++++++++++++
 common/spl/spl.c                         |   5 +
 common/spl/spl_mmc.c                     |   6 +-
 include/spl.h                            |  14 +++
 8 files changed, 277 insertions(+), 2 deletions(-)
 create mode 100644 arch/arm/mach-stm32mp/include/mach/tzc.h
 create mode 100644 arch/arm/mach-stm32mp/tzc400.c

-- 
2.26.2

q