On 2/7/21 8:37 AM, Simon Glass wrote:
Hi Alexandru,
On Thu, 4 Feb 2021 at 12:56, Alexandru Gagniuc mr.nuke.me@gmail.com wrote:
The purpose of this change is to allow configuring TrustZone (TZC) memory permissions. For example, OP-TEE expects TZC regions to be configured in a very particular way. The API presented here is intended to allow exactly that.
UCLASS support is not implemented, because it would not be too useful. Changing TZC permissions needs to be done with care, so as not to cut off access to memory we are currently using. One place where we can use this is at the end of SPL, right before jumping to OP-TEE.
Signed-off-by: Alexandru Gagniuc mr.nuke.me@gmail.com
arch/arm/mach-stm32mp/Makefile | 1 + arch/arm/mach-stm32mp/include/mach/tzc.h | 33 ++++++ arch/arm/mach-stm32mp/tzc400.c | 135 +++++++++++++++++++++++ 3 files changed, 169 insertions(+) create mode 100644 arch/arm/mach-stm32mp/include/mach/tzc.h create mode 100644 arch/arm/mach-stm32mp/tzc400.c
If this is an API you should add comments to the header file structs and functions.
Is this API specific to just this chip?
I've designed and validated this to set up stm32mp for starting up OP-TEE. It's a narrow use case. I can't speak for other chips.
Alex