From c09bfc666c1bf42b3b380e390a12ebcaa7e6e8f4 Mon Sep 17 00:00:00 2001 From: Abdellatif El Khlifi Date: Thu, 13 Jul 2023 14:28:41 +0100 Subject: arm_ffa: introduce Arm FF-A support 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 Reviewed-by: Simon Glass Cc: Tom Rini Cc: Ilias Apalodimas Cc: Jens Wiklander Cc: Heinrich Schuchardt --- include/dm/uclass-id.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/dm') diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index 307ad6931ca..3c6af2e3d2f 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -4,6 +4,11 @@ * * (C) Copyright 2012 * Pavel Herrmann + * + * Copyright 2022-2023 Arm Limited and/or its affiliates + * + * Authors: + * Abdellatif El Khlifi */ #ifndef _DM_UCLASS_ID_H @@ -57,6 +62,7 @@ enum uclass_id { UCLASS_ETH, /* Ethernet device */ UCLASS_ETH_PHY, /* Ethernet PHY device */ UCLASS_EXTCON, /* External Connector Class */ + UCLASS_FFA, /* Arm Firmware Framework for Armv8-A */ UCLASS_FIRMWARE, /* Firmware */ UCLASS_FPGA, /* FPGA device */ UCLASS_FUZZING_ENGINE, /* Fuzzing engine */ -- cgit v1.3.1