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Diffstat (limited to 'drivers/firmware/arm-ffa/Kconfig')
| -rw-r--r-- | drivers/firmware/arm-ffa/Kconfig | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/firmware/arm-ffa/Kconfig b/drivers/firmware/arm-ffa/Kconfig new file mode 100644 index 0000000..9200c80 --- /dev/null +++ b/drivers/firmware/arm-ffa/Kconfig @@ -0,0 +1,36 @@ +# SPDX-License-Identifier: GPL-2.0 + +config ARM_FFA_TRANSPORT + bool "Enable Arm Firmware Framework for Armv8-A driver" + depends on DM && ARM64 + select ARM_SMCCC + select ARM_SMCCC_FEATURES + select LIB_UUID + select DEVRES + help + The Firmware Framework for Arm A-profile processors (FF-A) + describes interfaces (ABIs) that standardize communication + between the Secure World and Normal World leveraging TrustZone + technology. + + The FF-A support in U-Boot is based on FF-A specification v1.0 and uses SMC32 + calling convention. + + FF-A specification: + + https://developer.arm.com/documentation/den0077/a/?lang=en + + In U-Boot FF-A design, FF-A is considered as a discoverable bus. + FF-A bus is discovered using ARM_SMCCC_FEATURES mechanism performed + by the PSCI driver. + 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). + The FF-A support on U-Boot takes care of all the interactions between Normal + world and Secure World. + + 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 about the FF-A support, please refer to doc/arch/arm64.ffa.rst + |