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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]. [1]: https://developer.arm.com/documentation/den0077/latest/ [2]: doc/arch/arm64.ffa.rst Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Cc: Tom Rini <trini@konsulko.com> Cc: Jens Wiklander <jens.wiklander@linaro.org> Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>
36 lines
1.3 KiB
Text
36 lines
1.3 KiB
Text
# SPDX-License-Identifier: GPL-2.0
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config ARM_FFA_TRANSPORT
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bool "Enable Arm Firmware Framework for Armv8-A driver"
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depends on DM && ARM64
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select ARM_SMCCC
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select ARM_SMCCC_FEATURES
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select LIB_UUID
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select DEVRES
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help
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The Firmware Framework for Arm A-profile processors (FF-A)
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describes interfaces (ABIs) that standardize communication
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between the Secure World and Normal World leveraging TrustZone
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technology.
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The FF-A support in U-Boot is based on FF-A specification v1.0 and uses SMC32
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calling convention.
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FF-A specification:
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https://developer.arm.com/documentation/den0077/a/?lang=en
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In U-Boot FF-A design, FF-A is considered as a discoverable bus.
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FF-A bus is discovered using ARM_SMCCC_FEATURES mechanism performed
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by the PSCI driver.
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The Secure World is considered as one entity to communicate with
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using the FF-A bus.
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FF-A communication is handled by one device and one instance (the bus).
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The FF-A support on U-Boot takes care of all the interactions between Normal
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world and Secure World.
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Generic FF-A methods are implemented in the Uclass (arm-ffa-uclass.c).
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Arm specific methods are implemented in the Arm driver (arm-ffa.c).
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For more details about the FF-A support, please refer to doc/arch/arm64.ffa.rst
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