Hi Abdellatif,
On Fri, 30 Jun 2023 at 13:49, Abdellatif El Khlifi abdellatif.elkhlifi@arm.com wrote:
Hi Simon,
On Tue, Jun 20, 2023 at 11:27:20AM +0100, Simon Glass wrote:
abdellatif.elkhlifi@arm.com wrote:
Add Arm FF-A support implementing Arm Firmware Framework for Armv8-A v1.0
The Firmware Framework for Arm A-profile processors (FF-A v1.0) [1] describes interfaces (ABIs) that standardize communication between the Secure World and Normal World leveraging TrustZone technology.
This driver uses 64-bit registers as per SMCCCv1.2 spec and comes on top of the SMCCC layer. The driver provides the FF-A ABIs needed for querying the FF-A framework from the secure world.
The driver uses SMC32 calling convention which means using the first 32-bit data of the Xn registers.
All supported ABIs come with their 32-bit version except FFA_RXTX_MAP which has 64-bit version supported.
Both 32-bit and 64-bit direct messaging are supported which allows both 32-bit and 64-bit clients to use the FF-A bus.
FF-A is a discoverable bus and similar to architecture features. FF-A bus is discovered using ARM_SMCCC_FEATURES mechanism performed by the PSCI driver.
Clients are able to probe then use the FF-A bus by calling the DM class searching APIs (e.g: uclass_first_device).
The Secure World is considered as one entity to communicate with using the FF-A bus. FF-A communication is handled by one device and one instance (the bus). This FF-A driver takes care of all the interactions between Normal world and Secure World.
The driver exports its operations to be used by upper layers.
Exported operations:
- ffa_partition_info_get
- ffa_sync_send_receive
- ffa_rxtx_unmap
Generic FF-A methods are implemented in the Uclass (arm-ffa-uclass.c). Arm specific methods are implemented in the Arm driver (arm-ffa.c).
For more details please refer to the driver documentation [2].
Signed-off-by: Abdellatif El Khlifi abdellatif.elkhlifi@arm.com Cc: Tom Rini trini@konsulko.com Cc: Simon Glass sjg@chromium.org Cc: Ilias Apalodimas ilias.apalodimas@linaro.org Cc: Jens Wiklander jens.wiklander@linaro.org Cc: Heinrich Schuchardt xypron.glpk@gmx.de
Changelog:
v13:
- doc minor change: specify in the readme that the user should call ffa_rxtx_unmap() driver operation to unmap the RX/TX buffers on demand.
Are you happy with this commit please ? May I add a Reviewed-by ?
Sorry I think I did something wrong on the previous reply.
Reviewed-by: Simon Glass sjg@chromium.org
Regards, Simon