Emulate Secure World's FF-A ABIs and allow testing U-Boot FF-A support
Features of the sandbox FF-A support:
- Introduce an FF-A emulator
- Introduce an FF-A device driver for FF-A comms with emulated Secure World
- Provides test methods allowing to read the status of the inspected ABIs
The sandbox FF-A emulator supports only 64-bit direct messaging.
Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhl...@arm.com>
Cc: Tom Rini <tr...@konsulko.com>
Cc: Simon Glass <s...@chromium.org>
Cc: Ilias Apalodimas <ilias.apalodi...@linaro.org>
Cc: Jens Wiklander <jens.wiklan...@linaro.org>
Cc: Heinrich Schuchardt <xypron.g...@gmx.de>
---
Changelog:
===============
v10:
* split the FF-A sandbox support into an emulator and a driver
* read FFA_VERSION and FFA_PARTITION_INFO_GET state using
sandbox_ffa_query_core_state()
* drop CONFIG_SANDBOX_FFA config
* address nits
v9: align FF-A sandbox driver with FF-A discovery through DM
v8: update ffa_bus_prvdata_get() to return a pointer rather than
a pointer address
v7: state that sandbox driver supports only 64-bit direct messaging
v4: align sandbox driver with the new FF-A driver interfaces
and new way of error handling
v1: introduce the sandbox driver
MAINTAINERS | 3 +-
arch/sandbox/dts/sandbox.dtsi | 8 +
arch/sandbox/dts/test.dts | 8 +
arch/sandbox/include/asm/sandbox_arm_ffa.h | 68 ++
.../include/asm/sandbox_arm_ffa_priv.h | 133 ++++
configs/sandbox64_defconfig | 1 +
configs/sandbox_defconfig | 1 +
doc/arch/arm64.ffa.rst | 7 +-
doc/arch/sandbox/sandbox.rst | 1 +
drivers/firmware/arm-ffa/Kconfig | 13 +-
drivers/firmware/arm-ffa/Makefile | 10 +-
drivers/firmware/arm-ffa/ffa-emul-uclass.c | 732 ++++++++++++++++++
.../firmware/arm-ffa/sandbox_arm_ffa_priv.h | 14 -
drivers/firmware/arm-ffa/sandbox_ffa.c | 108 +++
include/dm/uclass-id.h | 1 +
15 files changed, 1087 insertions(+), 21 deletions(-)
create mode 100644 arch/sandbox/include/asm/sandbox_arm_ffa.h
create mode 100644 arch/sandbox/include/asm/sandbox_arm_ffa_priv.h
create mode 100644 drivers/firmware/arm-ffa/ffa-emul-uclass.c
delete mode 100644 drivers/firmware/arm-ffa/sandbox_arm_ffa_priv.h
create mode 100644 drivers/firmware/arm-ffa/sandbox_ffa.c
diff --git a/MAINTAINERS b/MAINTAINERS
index add208e4ef..b8019517ba 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -269,12 +269,13 @@ F: configs/cortina_presidio-asic-pnand_defconfig
ARM FF-A
M: Abdellatif El Khlifi <abdellatif.elkhl...@arm.com>
S: Maintained
+F: arch/sandbox/include/asm/sandbox_arm_ffa.h
+F: arch/sandbox/include/asm/sandbox_arm_ffa_priv.h
F: cmd/armffa.c
F: doc/arch/arm64.ffa.rst
F: doc/usage/cmd/armffa.rst
F: drivers/firmware/arm-ffa/
F: include/arm_ffa.h
-F: include/sandbox_arm_ffa.h
ARM FREESCALE IMX
M: Stefano Babic <sba...@denx.de>
diff --git a/arch/sandbox/dts/sandbox.dtsi b/arch/sandbox/dts/sandbox.dtsi
index 30a305c4d2..ac713800d1 100644
--- a/arch/sandbox/dts/sandbox.dtsi
+++ b/arch/sandbox/dts/sandbox.dtsi
@@ -445,6 +445,14 @@
thermal {
compatible = "sandbox,thermal";
};
+
+ arm-ffa-emul {
+ compatible = "sandbox,arm-ffa-emul";
+ };
+
+ sandbox-arm-ffa {
+ compatible = "sandbox,arm-ffa";
+ };
};
&cros_ec {
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index d72d7a567a..bd42906159 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -1802,6 +1802,14 @@
compatible = "u-boot,fwu-mdata-gpt";
fwu-mdata-store = <&mmc0>;
};
+
+ arm-ffa-emul {
+ compatible = "sandbox,arm-ffa-emul";
+ };
+
+ sandbox-arm-ffa {
+ compatible = "sandbox,arm-ffa";
+ };
};
#include "sandbox_pmic.dtsi"
diff --git a/arch/sandbox/include/asm/sandbox_arm_ffa.h
b/arch/sandbox/include/asm/sandbox_arm_ffa.h
new file mode 100644
index 0000000000..3652830e4e
--- /dev/null
+++ b/arch/sandbox/include/asm/sandbox_arm_ffa.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2022-2023 Arm Limited and/or its affiliates
<open-source-off...@arm.com>
+ *
+ * Authors:
+ * Abdellatif El Khlifi <abdellatif.elkhl...@arm.com>
+ */
+
+#ifndef __SANDBOX_ARM_FFA_H
+#define __SANDBOX_ARM_FFA_H
+
+#include <arm_ffa.h>
+
+/*
+ * This header provides public sandbox FF-A emulator declarations
+ * and declarations needed by FF-A sandbox clients
+ */
+
+/* UUIDs strings of the emulated services */
+#define SANDBOX_SERVICE1_UUID "ed32d533-4209-99e6-2d72-cdd998a79cc0"
+#define SANDBOX_SERVICE2_UUID "ed32d544-4209-99e6-2d72-cdd998a79cc0"
+
+/* IDs of the emulated secure partitions (SPs) */
+#define SANDBOX_SP1_ID 0x1245
+#define SANDBOX_SP2_ID 0x9836
+#define SANDBOX_SP3_ID 0x6452
+#define SANDBOX_SP4_ID 0x7814
+
+/* Invalid service UUID (no matching SP) */
+#define SANDBOX_SERVICE3_UUID "55d532ed-0942-e699-722d-c09ca798d9cd"
+
+/* Invalid service UUID (invalid UUID string format) */
+#define SANDBOX_SERVICE4_UUID "32ed-0942-e699-722d-c09ca798d9cd"
+
+/* Number of valid services */
+#define SANDBOX_SP_COUNT_PER_VALID_SERVICE 2
+
+/**
+ * struct ffa_sandbox_data - query ABI state data structure
+ * @data0_size: size of the first argument
+ * @data0: pointer to the first argument
+ * @data1_size>: size of the second argument
+ * @data1: pointer to the second argument
+ *
+ * Used to pass various types of data with different sizes between
+ * the test cases and the sandbox emulator.
+ * The data is for querying FF-A ABIs state.
+ */
+struct ffa_sandbox_data {
+ u32 data0_size; /* size of the first argument */
+ void *data0; /* pointer to the first argument */
+ u32 data1_size; /* size of the second argument */
+ void *data1; /* pointer to the second argument */
+};
+
+/* The sandbox FF-A emulator public functions */
+
+/**
+ * sandbox_ffa_query_core_state() - Inspect the FF-A ABIs
+ * @queried_func_id: The FF-A function to be queried
+ * @func_data: Pointer to the FF-A function arguments container structure
+ * Return:
+ * 0 on success. Otherwise, failure
+ */
+int sandbox_ffa_query_core_state(u32 queried_func_id,
+ struct ffa_sandbox_data *func_data);
+
+#endif
diff --git a/arch/sandbox/include/asm/sandbox_arm_ffa_priv.h
b/arch/sandbox/include/asm/sandbox_arm_ffa_priv.h
new file mode 100644
index 0000000000..8fbfa3760d
--- /dev/null
+++ b/arch/sandbox/include/asm/sandbox_arm_ffa_priv.h
@@ -0,0 +1,133 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2022-2023 Arm Limited and/or its affiliates
<open-source-off...@arm.com>
+ *
+ * Authors:
+ * Abdellatif El Khlifi <abdellatif.elkhl...@arm.com>
+ */
+
+#ifndef __SANDBOX_ARM_FFA_PRV_H
+#define __SANDBOX_ARM_FFA_PRV_H
+
+#include <arm_ffa_priv.h>
+
+/* This header is exclusively used by the Sandbox FF-A driver and emulator */
+
+/* Non-secure physical FF-A instance */
+#define NS_PHYS_ENDPOINT_ID (0)
+
+#define GET_NS_PHYS_ENDPOINT_ID_MASK GENMASK(31, 16)
+#define GET_NS_PHYS_ENDPOINT_ID(x) \
+ ((u16)(FIELD_GET(GET_NS_PHYS_ENDPOINT_ID_MASK, (x))))
+
+/* Helper macro for reading the destination partition ID */
+#define GET_DST_SP_ID_MASK GENMASK(15, 0)
+#define GET_DST_SP_ID(x) \
+ ((u16)(FIELD_GET(GET_DST_SP_ID_MASK, (x))))
+
+/* Helper macro for setting the source partition ID */
+#define PREP_SRC_SP_ID_MASK GENMASK(31, 16)
+#define PREP_SRC_SP_ID(x) \
+ (FIELD_PREP(PREP_SRC_SP_ID_MASK, (x)))
+
+/* Helper macro for setting the destination endpoint ID */
+#define PREP_NS_PHYS_ENDPOINT_ID_MASK GENMASK(15, 0)
+#define PREP_NS_PHYS_ENDPOINT_ID(x) \
+ (FIELD_PREP(PREP_NS_PHYS_ENDPOINT_ID_MASK, (x)))
+
+/* RX/TX buffers minimum size */
+#define RXTX_BUFFERS_MIN_SIZE (RXTX_4K)
+#define RXTX_BUFFERS_MIN_PAGES (1)
+
+/* MBZ registers info */
+
+/* x1-x7 MBZ */
+#define FFA_X1X7_MBZ_CNT (7)
+#define FFA_X1X7_MBZ_REG_START (&res->a1)
+
+/* x4-x7 MBZ */
+#define FFA_X4X7_MBZ_CNT (4)
+#define FFA_X4X7_MBZ_REG_START (&res->a4)
+
+/* x3-x7 MBZ */
+#define FFA_X3X7_MBZ_CNT (5)
+#define FFA_X3_MBZ_REG_START (&res->a3)
+
+/* number of emulated FF-A secure partitions (SPs) */
+#define SANDBOX_PARTITIONS_CNT (4)
+
+/* Binary data of the emulated services UUIDs */
+
+/* service 1 UUID binary data (little-endian format) */
+#define SANDBOX_SERVICE1_UUID_A1 0xed32d533
+#define SANDBOX_SERVICE1_UUID_A2 0x99e64209
+#define SANDBOX_SERVICE1_UUID_A3 0x9cc02d72
+#define SANDBOX_SERVICE1_UUID_A4 0xcdd998a7
+
+/* service 2 UUID binary data (little-endian format) */
+#define SANDBOX_SERVICE2_UUID_A1 0xed32d544
+#define SANDBOX_SERVICE2_UUID_A2 0x99e64209
+#define SANDBOX_SERVICE2_UUID_A3 0x9cc02d72
+#define SANDBOX_SERVICE2_UUID_A4 0xcdd998a7
+
+/**
+ * struct ffa_rxtxpair_info - structure hosting the RX/TX buffers flags
+ * @rxbuf_owned: RX buffer ownership flag (the owner is non secure world)
+ * @rxbuf_mapped: RX buffer mapping flag
+ * @txbuf_owned TX buffer ownership flag
+ * @txbuf_mapped: TX buffer mapping flag
+ * @rxtx_buf_size: RX/TX buffers size
+ *
+ * Hosts the ownership/mapping flags of the RX/TX buffers
+ * When a buffer is owned/mapped its corresponding flag is set to 1 otherwise
0.
+ */
+struct ffa_rxtxpair_info {
+ u8 rxbuf_owned;
+ u8 rxbuf_mapped;
+ u8 txbuf_owned;
+ u8 txbuf_mapped;
+ u32 rxtx_buf_size;
+};
+
+/**
+ * struct sandbox_ffa_emul - emulator data
+ *
+ * @fwk_version: FF-A framework version
+ * @id: u-boot endpoint ID
+ * @partitions: The partitions descriptors structure
+ * @pair: The RX/TX buffers pair
+ * @pair_info: The RX/TX buffers pair flags and size
+ * @test_ffa_data: The data of the FF-A bus under test
+ *
+ * Hosts all the emulated secure world data.
+ */
+struct sandbox_ffa_emul {
+ u32 fwk_version;
+ u16 id;
+ struct ffa_partitions partitions;
+ struct ffa_rxtxpair pair;
+ struct ffa_rxtxpair_info pair_info;
+};
+
+/**
+ * struct ffa_emul_ops - Operations for the FF-A emulator
+ * @invoke_ffa_fn: callback for the emulated SMC call
+ *
+ * Provides all the operations supported by the FF-A emulator.
+ */
+struct ffa_emul_ops {
+ void (*invoke_ffa_fn)(ffa_value_t args, ffa_value_t *res);
+};
+
+#define ffa_emul_get_ops(dev) ((struct ffa_emul_ops
*)(dev)->driver->ops)
+
+/**
+ * ffa_emul_find() - Finds the FF-A emulator
+ * @dev: the sandbox FF-A device (sandbox-arm-ffa)
+ * @emulp: the FF-A emulator device (sandbox-ffa-emul)
+ * Return:
+ * 0 on success. Otherwise, failure
+ */
+int ffa_emul_find(struct udevice *dev, struct udevice **emulp);
+
+#endif
diff --git a/configs/sandbox64_defconfig b/configs/sandbox64_defconfig
index b7737814af..89c17e4042 100644
--- a/configs/sandbox64_defconfig
+++ b/configs/sandbox64_defconfig
@@ -260,3 +260,4 @@ CONFIG_FWU_MULTI_BANK_UPDATE=y
CONFIG_UNIT_TEST=y
CONFIG_UT_TIME=y
CONFIG_UT_DM=y
+CONFIG_ARM_FFA_TRANSPORT=y
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index ac1e8bbbef..26ef035877 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -337,3 +337,4 @@ CONFIG_TEST_FDTDEC=y
CONFIG_UNIT_TEST=y
CONFIG_UT_TIME=y
CONFIG_UT_DM=y
+CONFIG_ARM_FFA_TRANSPORT=y
diff --git a/doc/arch/arm64.ffa.rst b/doc/arch/arm64.ffa.rst
index 5fedb0c255..457a0e112e 100644
--- a/doc/arch/arm64.ffa.rst
+++ b/doc/arch/arm64.ffa.rst
@@ -33,7 +33,11 @@ Runtime support will be added in future developments.
The U-Boot FF-A support provides the following parts:
- A Uclass driver providing generic FF-A methods.
-- An Arm FF-A driver providing Arm specific methods and reusing the Uclass
methods.
+- An Arm FF-A device driver providing Arm specific methods and reusing the
Uclass methods.
+- A sandbox emulator for Arm FF-A, emulates the FF-A side of the Secure World
and provides
+ FF-A ABIs inspection methods.
+- An FF-A sandbox device driver for FF-A communication with the emulated
Secure World.
+ The driver leverages the FF-A Uclass to establish FF-A communication.
FF-A and SMC specifications
-------------------------------------------
@@ -69,6 +73,7 @@ CONFIG_ARM_FFA_TRANSPORT
Enables the FF-A support. Turn this on if you want to use FF-A
communication.
When using an Arm 64-bit platform, the Arm FF-A driver will be used.
+ When using sandbox, the sandbox FF-A emulator and FF-A sandbox driver will
be used.
FF-A ABIs under the hood
---------------------------------------
diff --git a/doc/arch/sandbox/sandbox.rst b/doc/arch/sandbox/sandbox.rst
index cd7f8a2cb0..c5df372e00 100644
--- a/doc/arch/sandbox/sandbox.rst
+++ b/doc/arch/sandbox/sandbox.rst
@@ -200,6 +200,7 @@ Supported Drivers
U-Boot sandbox supports these emulations:
+- Arm FF-A
- Block devices
- Chrome OS EC
- GPIO
diff --git a/drivers/firmware/arm-ffa/Kconfig b/drivers/firmware/arm-ffa/Kconfig
index a7d5392859..d75f8b53fd 100644
--- a/drivers/firmware/arm-ffa/Kconfig
+++ b/drivers/firmware/arm-ffa/Kconfig
@@ -2,9 +2,9 @@
config ARM_FFA_TRANSPORT
bool "Enable Arm Firmware Framework for Armv8-A driver"
- depends on DM && ARM64
- select ARM_SMCCC
- select ARM_SMCCC_FEATURES
+ depends on DM && (ARM64 || SANDBOX)
+ select ARM_SMCCC if !SANDBOX
+ select ARM_SMCCC_FEATURES if !SANDBOX
imply CMD_ARMFFA
select LIB_UUID
select DEVRES
@@ -33,5 +33,10 @@ config ARM_FFA_TRANSPORT
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
+ FF-A sandbox is provided to run FF-A under sandbox and allows to test
the FF-A Uclass.
+ Sandbox support includes an emulator for Arm FF-A which emulates the
FF-A side of
+ the Secure World and provides FF-A ABIs inspection methods
(ffa-emul-uclass.c).
+ An FF-A sandbox driver is also provided for FF-A communication with
the emulated
+ Secure World (sandbox_ffa.c).
+ For more details about the FF-A support, please refer to
doc/arch/arm64.ffa.rst
diff --git a/drivers/firmware/arm-ffa/Makefile
b/drivers/firmware/arm-ffa/Makefile
index 11b1766285..318123a7f4 100644
--- a/drivers/firmware/arm-ffa/Makefile
+++ b/drivers/firmware/arm-ffa/Makefile
@@ -5,4 +5,12 @@
# Authors:
# Abdellatif El Khlifi <abdellatif.elkhl...@arm.com>
-obj-y += arm-ffa-uclass.o arm-ffa.o
+# build the generic FF-A methods
+obj-y += arm-ffa-uclass.o
+ifeq ($(CONFIG_SANDBOX),y)
+# build the FF-A sandbox emulator and driver
+obj-y += ffa-emul-uclass.o sandbox_ffa.o
+else
+# build the Arm64 FF-A driver
+obj-y += arm-ffa.o
+endif
diff --git a/drivers/firmware/arm-ffa/ffa-emul-uclass.c
b/drivers/firmware/arm-ffa/ffa-emul-uclass.c
new file mode 100644
index 0000000000..ba4d3c9f3f
--- /dev/null
+++ b/drivers/firmware/arm-ffa/ffa-emul-uclass.c
@@ -0,0 +1,732 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2022-2023 Arm Limited and/or its affiliates
<open-source-off...@arm.com>
+ *
+ * Authors:
+ * Abdellatif El Khlifi <abdellatif.elkhl...@arm.com>
+ */
+#include <common.h>
+#include <dm.h>
+#include <mapmem.h>
+#include <string.h>
+#include <asm/global_data.h>
+#include <asm/sandbox_arm_ffa.h>
+#include <asm/sandbox_arm_ffa_priv.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/root.h>
+#include <linux/errno.h>
+#include <linux/sizes.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* The partitions (SPs) table */
+static struct ffa_partition_desc sandbox_partitions[SANDBOX_PARTITIONS_CNT] = {
+ {
+ .info = { .id = SANDBOX_SP1_ID, .exec_ctxt = 0x5687,
+ .properties = 0x89325621 },
+ .sp_uuid = {
+ .a1 = SANDBOX_SERVICE1_UUID_A1,
+ .a2 = SANDBOX_SERVICE1_UUID_A2,
+ .a3 = SANDBOX_SERVICE1_UUID_A3,
+ .a4 = SANDBOX_SERVICE1_UUID_A4,
+ }
+ },
+ {
+ .info = { .id = SANDBOX_SP2_ID, .exec_ctxt = 0x9587,
+ .properties = 0x45325621 },
+ .sp_uuid = {
+ .a1 = SANDBOX_SERVICE2_UUID_A1,
+ .a2 = SANDBOX_SERVICE2_UUID_A2,
+ .a3 = SANDBOX_SERVICE2_UUID_A3,
+ .a4 = SANDBOX_SERVICE2_UUID_A4,
+ }
+ },
+ {
+ .info = { .id = SANDBOX_SP3_ID, .exec_ctxt = 0x7687,
+ .properties = 0x23325621 },
+ .sp_uuid = {
+ .a1 = SANDBOX_SERVICE1_UUID_A1,
+ .a2 = SANDBOX_SERVICE1_UUID_A2,
+ .a3 = SANDBOX_SERVICE1_UUID_A3,
+ .a4 = SANDBOX_SERVICE1_UUID_A4,
+ }
+ },
+ {
+ .info = { .id = SANDBOX_SP4_ID, .exec_ctxt = 0x1487,
+ .properties = 0x70325621 },
+ .sp_uuid = {
+ .a1 = SANDBOX_SERVICE2_UUID_A1,
+ .a2 = SANDBOX_SERVICE2_UUID_A2,
+ .a3 = SANDBOX_SERVICE2_UUID_A3,
+ .a4 = SANDBOX_SERVICE2_UUID_A4,
+ }
+ }
+
+};
+
+/* The emulator functions */
+
+/**
+ * sandbox_ffa_version() - Emulated FFA_VERSION handler function
+ * @dev: The sandbox FF-A emulator device
+ * @pargs: The SMC call input arguments a0-a7
+ * @res: The SMC return data
+ *
+ * Emulates FFA_VERSION FF-A function.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+
+static int sandbox_ffa_version(struct udevice *dev, ffa_value_t *pargs,
ffa_value_t *res)
+{
+ struct sandbox_ffa_emul *priv = dev_get_priv(dev);
+
+ priv->fwk_version = FFA_VERSION_1_0;
+ res->a0 = priv->fwk_version;
+
+ /* x1-x7 MBZ */
+ memset(FFA_X1X7_MBZ_REG_START, 0,
+ FFA_X1X7_MBZ_CNT * sizeof(ulong));
+
+ return 0;
+}
+
+/**
+ * sandbox_ffa_id_get() - Emulated FFA_ID_GET handler function
+ * @dev: The sandbox FF-A emulator device
+ * @pargs: The SMC call input arguments a0-a7
+ * @res: The SMC return data
+ *
+ * Emulates FFA_ID_GET FF-A function.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_id_get(struct udevice *dev, ffa_value_t *pargs,
ffa_value_t *res)
+{
+ struct sandbox_ffa_emul *priv = dev_get_priv(dev);
+
+ res->a0 = FFA_SMC_32(FFA_SUCCESS);
+ res->a1 = 0;
+
+ priv->id = NS_PHYS_ENDPOINT_ID;
+ res->a2 = priv->id;
+
+ /* x3-x7 MBZ */
+ memset(FFA_X3_MBZ_REG_START, 0,
+ FFA_X3X7_MBZ_CNT * sizeof(ulong));
+
+ return 0;
+}
+
+/**
+ * sandbox_ffa_features() - Emulated FFA_FEATURES handler function
+ * @pargs: The SMC call input arguments a0-a7
+ * @res: The SMC return data
+ *
+ * Emulates FFA_FEATURES FF-A function.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_features(ffa_value_t *pargs, ffa_value_t *res)
+{
+ res->a1 = 0;
+
+ if (pargs->a1 == FFA_SMC_64(FFA_RXTX_MAP)) {
+ res->a0 = FFA_SMC_32(FFA_SUCCESS);
+ res->a2 = RXTX_BUFFERS_MIN_SIZE;
+ res->a3 = 0;
+ /* x4-x7 MBZ */
+ memset(FFA_X4X7_MBZ_REG_START,
+ 0, FFA_X4X7_MBZ_CNT * sizeof(ulong));
+ return 0;
+ }
+
+ res->a0 = FFA_SMC_32(FFA_ERROR);
+ res->a2 = -NOT_SUPPORTED;
+ /* x3-x7 MBZ */
+ memset(FFA_X3_MBZ_REG_START,
+ 0, FFA_X3X7_MBZ_CNT * sizeof(ulong));
+ log_err("[FFA][Sandbox][Emul] FF-A interface 0x%lx not implemented\n",
+ pargs->a1);
+
+ return ffa_to_std_errmap[NOT_SUPPORTED];
+}
+
+/**
+ * sandbox_ffa_partition_info_get() - Emulated FFA_PARTITION_INFO_GET handler
+ * @dev: The sandbox FF-A emulator device
+ * @pargs: The SMC call input arguments a0-a7
+ * @res: The SMC return data
+ *
+ * Emulates FFA_PARTITION_INFO_GET FF-A function.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_partition_info_get(struct udevice *dev, ffa_value_t
*pargs, ffa_value_t *res)
+{
+ struct ffa_partition_info *rxbuf_desc_info = NULL;
+ u32 descs_cnt;
+ u32 descs_size_bytes;
+ int ret;
+ struct sandbox_ffa_emul *priv = dev_get_priv(dev);
+
+ res->a0 = FFA_SMC_32(FFA_ERROR);
+
+ if (!priv->pair.rxbuf) {
+ res->a2 = -DENIED;
+ ret = ffa_to_std_errmap[DENIED];
+ goto cleanup;
+ }
+
+ if (priv->pair_info.rxbuf_owned) {
+ res->a2 = -BUSY;
+ ret = ffa_to_std_errmap[BUSY];
+ goto cleanup;
+ }
+
+ if (!priv->partitions.descs) {
+ priv->partitions.descs = sandbox_partitions;
+ priv->partitions.count = SANDBOX_PARTITIONS_CNT;
+ }
+
+ descs_size_bytes = SANDBOX_PARTITIONS_CNT *
+ sizeof(struct ffa_partition_desc);
+
+ /* Abort if the RX buffer size is smaller than the descs buffer size */
+ if ((priv->pair_info.rxtx_buf_size * SZ_4K) < descs_size_bytes) {
+ res->a2 = -NO_MEMORY;
+ ret = ffa_to_std_errmap[NO_MEMORY];
+ goto cleanup;
+ }
+
+ rxbuf_desc_info = priv->pair.rxbuf;
+
+ /* No UUID specified. Return the information of all partitions */
+ if (!pargs->a1 && !pargs->a2 && !pargs->a3 && !pargs->a4) {
+ for (descs_cnt = 0; descs_cnt < SANDBOX_PARTITIONS_CNT;
+ descs_cnt++)
+ *(rxbuf_desc_info++) =
+ priv->partitions.descs[descs_cnt].info;
+
+ res->a0 = FFA_SMC_32(FFA_SUCCESS);
+ res->a2 = SANDBOX_PARTITIONS_CNT;
+ /* Transfer ownership to the consumer: the non secure world */
+ priv->pair_info.rxbuf_owned = 1;
+ ret = 0;
+
+ goto cleanup;
+ }
+
+ /* A UUID specified. Return the info of all SPs matching the UUID */
+
+ for (descs_cnt = 0 ; descs_cnt < SANDBOX_PARTITIONS_CNT ; descs_cnt++)
+ if (pargs->a1 == priv->partitions.descs[descs_cnt].sp_uuid.a1 &&
+ pargs->a2 == priv->partitions.descs[descs_cnt].sp_uuid.a2 &&
+ pargs->a3 == priv->partitions.descs[descs_cnt].sp_uuid.a3 &&
+ pargs->a4 == priv->partitions.descs[descs_cnt].sp_uuid.a4) {
+ *(rxbuf_desc_info++) =
+ priv->partitions.descs[descs_cnt].info;
+ }
+
+ if (rxbuf_desc_info != priv->pair.rxbuf) {
+ res->a0 = FFA_SMC_32(FFA_SUCCESS);
+ /* Store the partitions count */
+ res->a2 = (ulong)
+ (rxbuf_desc_info - (struct ffa_partition_info *)
+ priv->pair.rxbuf);
+ ret = 0;
+
+ /* Transfer ownership to the consumer: the non secure world */
+ priv->pair_info.rxbuf_owned = 1;
+ } else {
+ /* Unrecognized UUID */
+ res->a2 = -INVALID_PARAMETERS;
+ ret = ffa_to_std_errmap[INVALID_PARAMETERS];
+ }
+
+cleanup:
+
+ log_err("[FFA][Sandbox][Emul] FFA_PARTITION_INFO_GET (%ld)\n", res->a2);
+
+ res->a1 = 0;
+
+ /* x3-x7 MBZ */
+ memset(FFA_X3_MBZ_REG_START, 0,
+ FFA_X3X7_MBZ_CNT * sizeof(ulong));
+
+ return ret;
+}
+
+/**
+ * sandbox_ffa_rxtx_map() - Emulated FFA_RXTX_MAP handler
+ * @dev: The sandbox FF-A emulator device
+ * @pargs: The SMC call input arguments a0-a7
+ * @res: The SMC return data
+ *
+ * Emulates FFA_RXTX_MAP FF-A function.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_rxtx_map(struct udevice *dev, ffa_value_t *pargs,
ffa_value_t *res)
+{
+ int ret;
+ struct sandbox_ffa_emul *priv = dev_get_priv(dev);
+
+ res->a0 = FFA_SMC_32(FFA_ERROR);
+
+ if (priv->pair.txbuf && priv->pair.rxbuf) {
+ res->a2 = -DENIED;
+ ret = ffa_to_std_errmap[DENIED];
+ goto feedback;
+ }
+
+ if (pargs->a3 >= RXTX_BUFFERS_MIN_PAGES && pargs->a1 && pargs->a2) {
+ priv->pair.txbuf = map_sysmem(pargs->a1, 0);
+ priv->pair.rxbuf = map_sysmem(pargs->a2, 0);
+ priv->pair_info.rxtx_buf_size = pargs->a3;
+ priv->pair_info.rxbuf_mapped = 1;
+ res->a0 = FFA_SMC_32(FFA_SUCCESS);
+ res->a2 = 0;
+ ret = 0;
+ goto feedback;
+ }
+
+ if (!pargs->a1 || !pargs->a2) {
+ res->a2 = -INVALID_PARAMETERS;
+ ret = ffa_to_std_errmap[INVALID_PARAMETERS];
+ } else {
+ res->a2 = -NO_MEMORY;
+ ret = ffa_to_std_errmap[NO_MEMORY];
+ }
+
+ log_err("[FFA][Sandbox][Emul] error in FFA_RXTX_MAP arguments (%d)\n",
+ (int)res->a2);
+
+feedback:
+
+ res->a1 = 0;
+
+ /* x3-x7 MBZ */
+ memset(FFA_X3_MBZ_REG_START,
+ 0, FFA_X3X7_MBZ_CNT * sizeof(ulong));
+
+ return ret;
+}
+
+/**
+ * sandbox_ffa_rxtx_unmap() - Emulated FFA_RXTX_UNMAP handler
+ * @dev: The sandbox FF-A emulator device
+ * @pargs: The SMC call input arguments a0-a7
+ * @res: The SMC return data
+ *
+ * Emulates FFA_RXTX_UNMAP FF-A function.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_rxtx_unmap(struct udevice *dev, ffa_value_t *pargs,
ffa_value_t *res)
+{
+ int ret;
+ struct sandbox_ffa_emul *priv = dev_get_priv(dev);
+
+ res->a0 = FFA_SMC_32(FFA_ERROR);
+ res->a2 = -INVALID_PARAMETERS;
+ ret = ffa_to_std_errmap[INVALID_PARAMETERS];
+
+ if (GET_NS_PHYS_ENDPOINT_ID(pargs->a1) != priv->id)
+ goto feedback;
+
+ if (priv->pair.txbuf && priv->pair.rxbuf) {
+ priv->pair.txbuf = 0;
+ priv->pair.rxbuf = 0;
+ priv->pair_info.rxtx_buf_size = 0;
+ priv->pair_info.rxbuf_mapped = 0;
+ res->a0 = FFA_SMC_32(FFA_SUCCESS);
+ res->a2 = 0;
+ ret = 0;
+ goto feedback;
+ }
+
+ log_err("[FFA][Sandbox][Emul] No buffer pair registered on behalf of
the caller\n");
+
+feedback:
+
+ res->a1 = 0;
+
+ /* x3-x7 MBZ */
+ memset(FFA_X3_MBZ_REG_START,
+ 0, FFA_X3X7_MBZ_CNT * sizeof(ulong));
+
+ return ret;
+}
+
+/**
+ * sandbox_ffa_rx_release() - Emulated FFA_RX_RELEASE handler
+ * @dev: The sandbox FF-A emulator device
+ * @pargs: The SMC call input arguments a0-a7
+ * @res: The SMC return data
+ *
+ * Emulates FFA_RX_RELEASE FF-A function.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_rx_release(struct udevice *dev, ffa_value_t *pargs,
ffa_value_t *res)
+{
+ int ret;
+ struct sandbox_ffa_emul *priv = dev_get_priv(dev);
+
+ if (!priv->pair_info.rxbuf_owned) {
+ res->a0 = FFA_SMC_32(FFA_ERROR);
+ res->a2 = -DENIED;
+ ret = ffa_to_std_errmap[DENIED];
+ } else {
+ priv->pair_info.rxbuf_owned = 0;
+ res->a0 = FFA_SMC_32(FFA_SUCCESS);
+ res->a2 = 0;
+ ret = 0;
+ }
+
+ res->a1 = 0;
+
+ /* x3-x7 MBZ */
+ memset(FFA_X3_MBZ_REG_START,
+ 0, FFA_X3X7_MBZ_CNT * sizeof(ulong));
+
+ return ret;
+}
+
+/**
+ * sandbox_ffa_sp_valid() - Checks SP validity
+ * @dev: The sandbox FF-A emulator device
+ * @part_id: partition ID to check
+ *
+ * Searches the input ID in the descriptors table.
+ *
+ * Return:
+ *
+ * 1 on success (Partition found). Otherwise, failure
+ */
+static int sandbox_ffa_sp_valid(struct udevice *dev, u16 part_id)
+{
+ u32 descs_cnt;
+ struct sandbox_ffa_emul *priv = dev_get_priv(dev);
+
+ for (descs_cnt = 0 ; descs_cnt < SANDBOX_PARTITIONS_CNT ; descs_cnt++)
+ if (priv->partitions.descs[descs_cnt].info.id == part_id)
+ return 1;
+
+ return 0;
+}
+
+/**
+ * sandbox_ffa_msg_send_direct_req() - Emulated FFA_MSG_SEND_DIRECT_{REQ,RESP}
handler
+ * @dev: The sandbox FF-A emulator device
+ * @pargs: The SMC call input arguments a0-a7
+ * @res: The SMC return data
+ *
+ * Emulates FFA_MSG_SEND_DIRECT_{REQ,RESP} FF-A ABIs.
+ * Only SMC 64-bit is supported in Sandbox.
+ *
+ * Emulating interrupts is not supported. So, FFA_RUN and FFA_INTERRUPT are not
+ * supported. In case of success FFA_MSG_SEND_DIRECT_RESP is returned with
+ * default pattern data (0xff).
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_msg_send_direct_req(struct udevice *dev,
+ ffa_value_t *pargs, ffa_value_t *res)
+{
+ u16 part_id;
+ struct sandbox_ffa_emul *priv = dev_get_priv(dev);
+
+ part_id = GET_DST_SP_ID(pargs->a1);
+
+ if (GET_NS_PHYS_ENDPOINT_ID(pargs->a1) != priv->id ||
+ !sandbox_ffa_sp_valid(dev, part_id) || pargs->a2) {
+ res->a0 = FFA_SMC_32(FFA_ERROR);
+ res->a1 = 0;
+ res->a2 = -INVALID_PARAMETERS;
+
+ /* x3-x7 MBZ */
+ memset(FFA_X3_MBZ_REG_START,
+ 0, FFA_X3X7_MBZ_CNT * sizeof(ulong));
+
+ return ffa_to_std_errmap[INVALID_PARAMETERS];
+ }
+
+ res->a0 = FFA_SMC_64(FFA_MSG_SEND_DIRECT_RESP);
+
+ res->a1 = PREP_SRC_SP_ID(part_id) |
+ PREP_NS_PHYS_ENDPOINT_ID(priv->id);
+
+ res->a2 = 0;
+
+ /* Return 0xff bytes as a response */
+ res->a3 = -1UL;
+ res->a4 = -1UL;
+ res->a5 = -1UL;
+ res->a6 = -1UL;
+ res->a7 = -1UL;
+
+ return 0;
+}
+
+/**
+ * sandbox_ffa_get_rxbuf_flags() - Reading the mapping/ownership flags
+ * @dev: The sandbox FF-A emulator device
+ * @queried_func_id: The FF-A function to be queried
+ * @func_data: Pointer to the FF-A function arguments container structure
+ *
+ * Queries the status flags of the following emulated
+ * ABIs: FFA_RXTX_MAP, FFA_RXTX_UNMAP, FFA_RX_RELEASE.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_get_rxbuf_flags(struct udevice *dev, u32
queried_func_id,
+ struct ffa_sandbox_data *func_data)
+{
+ struct sandbox_ffa_emul *priv = dev_get_priv(dev);
+
+ if (!func_data)
+ return -EINVAL;
+
+ if (!func_data->data0 || func_data->data0_size != sizeof(u8))
+ return -EINVAL;
+
+ switch (queried_func_id) {
+ case FFA_RXTX_MAP:
+ case FFA_RXTX_UNMAP:
+ *((u8 *)func_data->data0) = priv->pair_info.rxbuf_mapped;
+ return 0;
+ case FFA_RX_RELEASE:
+ *((u8 *)func_data->data0) = priv->pair_info.rxbuf_owned;
+ return 0;
+ default:
+ log_err("[FFA][Sandbox][Emul] The querried FF-A interface flag
(%d) undefined\n",
+ queried_func_id);
+ return -EINVAL;
+ }
+}
+
+/**
+ * sandbox_ffa_get_fwk_version() - Return the FFA framework version
+ * @dev: The sandbox FF-A emulator device
+ * @func_data: Pointer to the FF-A function arguments container structure
+ *
+ * Return the FFA framework version read from the FF-A emulator data.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_get_fwk_version(struct udevice *dev, struct
ffa_sandbox_data *func_data)
+{
+ struct sandbox_ffa_emul *priv = dev_get_priv(dev);
+
+ if (!func_data)
+ return -EINVAL;
+
+ if (!func_data->data0 ||
+ func_data->data0_size != sizeof(priv->fwk_version))
+ return -EINVAL;
+
+ *((u32 *)func_data->data0) = priv->fwk_version;
+
+ return 0;
+}
+
+/**
+ * sandbox_ffa_get_parts() - Return the address of partitions data
+ * @dev: The sandbox FF-A emulator device
+ * @func_data: Pointer to the FF-A function arguments container structure
+ *
+ * Return the address of partitions data read from the FF-A emulator data.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_get_parts(struct udevice *dev, struct ffa_sandbox_data
*func_data)
+{
+ struct sandbox_ffa_emul *priv = dev_get_priv(dev);
+
+ if (!func_data)
+ return -EINVAL;
+
+ if (!func_data->data0 ||
+ func_data->data0_size != sizeof(struct ffa_partitions *))
+ return -EINVAL;
+
+ *((struct ffa_partitions **)func_data->data0) = &priv->partitions;
+
+ return 0;
+}
+
+/**
+ * sandbox_ffa_query_core_state() - Inspect the FF-A ABIs
+ * @queried_func_id: The FF-A function to be queried
+ * @func_data: Pointer to the FF-A function arguments container structure
+ *
+ * Queries the status of FF-A ABI specified in the input argument.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+int sandbox_ffa_query_core_state(u32 queried_func_id,
+ struct ffa_sandbox_data *func_data)
+{
+ struct udevice *dev;
+
+ uclass_first_device(UCLASS_FFA_EMUL, &dev);
+ if (!dev) {
+ log_err("[FFA][SANDBOX][Emul] Cannot find FF-A emulator during
querying state\n");
+ return -ENODEV;
+ }
+
+ switch (queried_func_id) {
+ case FFA_RXTX_MAP:
+ case FFA_RXTX_UNMAP:
+ case FFA_RX_RELEASE:
+ return sandbox_ffa_get_rxbuf_flags(dev, queried_func_id,
func_data);
+ case FFA_VERSION:
+ return sandbox_ffa_get_fwk_version(dev, func_data);
+ case FFA_PARTITION_INFO_GET:
+ return sandbox_ffa_get_parts(dev, func_data);
+ default:
+ log_err("[FFA][Sandbox][Emul] Undefined FF-A interface (%d)\n",
+ queried_func_id);
+ return -EINVAL;
+ }
+}
+
+/**
+ * sandbox_arm_ffa_smccc_smc() - FF-A SMC call emulation
+ * @args: the SMC call arguments
+ * @res: the SMC call returned data
+ *
+ * Emulates the FF-A ABIs SMC call.
+ * The emulated FF-A ABI is identified and invoked.
+ * FF-A emulation is based on the FF-A specification 1.0
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure.
+ * FF-A protocol error codes are returned using the registers arguments as
+ * described by the specification
+ */
+void sandbox_arm_ffa_smccc_smc(ffa_value_t args, ffa_value_t *res)
+{
+ int ret = 0;
+ struct udevice *dev;
+
+ uclass_first_device(UCLASS_FFA_EMUL, &dev);
+ if (!dev) {
+ log_err("[FFA][SANDBOX][Emul] Cannot find FF-A emulator during
SMC emulation\n");
+ return;
+ }
+
+ switch (args.a0) {
+ case FFA_SMC_32(FFA_VERSION):
+ ret = sandbox_ffa_version(dev, &args, res);
+ break;
+ case FFA_SMC_32(FFA_PARTITION_INFO_GET):
+ ret = sandbox_ffa_partition_info_get(dev, &args, res);
+ break;
+ case FFA_SMC_32(FFA_RXTX_UNMAP):
+ ret = sandbox_ffa_rxtx_unmap(dev, &args, res);
+ break;
+ case FFA_SMC_64(FFA_MSG_SEND_DIRECT_REQ):
+ ret = sandbox_ffa_msg_send_direct_req(dev, &args, res);
+ break;
+ case FFA_SMC_32(FFA_ID_GET):
+ ret = sandbox_ffa_id_get(dev, &args, res);
+ break;
+ case FFA_SMC_32(FFA_FEATURES):
+ ret = sandbox_ffa_features(&args, res);
+ break;
+ case FFA_SMC_64(FFA_RXTX_MAP):
+ ret = sandbox_ffa_rxtx_map(dev, &args, res);
+ break;
+ case FFA_SMC_32(FFA_RX_RELEASE):
+ ret = sandbox_ffa_rx_release(dev, &args, res);
+ break;
+ default:
+ log_err("[FFA][Sandbox][Emul] Undefined FF-A interface
(0x%lx)\n",
+ args.a0);
+ }
+
+ if (ret != 0)
+ log_err("[FFA][Sandbox][Emul] FF-A ABI internal failure
(%d)\n", ret);
+}
+
+/**
+ * ffa_emul_find() - Finds the FF-A emulator
+ * @dev: the sandbox FF-A device (sandbox-arm-ffa)
+ * @emulp: the FF-A emulator device (sandbox-ffa-emul)
+ *
+ * Searches for the FF-A emulator and returns its device pointer.
+ *
+ * Return:
+ * 0 on success. Otherwise, failure
+ */
+int ffa_emul_find(struct udevice *dev, struct udevice **emulp)
+{
+ if (!emulp)
+ return -EINVAL;
+
+ *emulp = NULL;
+
+ uclass_first_device(UCLASS_FFA_EMUL, emulp);
+ if (!(*emulp)) {
+ log_err("[FFA][SANDBOX][Emul] Cannot find FF-A emulator\n");
+ return -ENODEV;
+ }
+
+ log_info("[FFA][Sandbox][Emul] FF-A emulator found\n");
+
+ return 0;
+}
+
+UCLASS_DRIVER(ffa_emul) = {
+ .name = "ffa_emul",
+ .id = UCLASS_FFA_EMUL,
+};
+
+/* Sandbox Arm FF-A emulator operations */
+
+static const struct ffa_emul_ops sandbox_ffa_emul_ops = {
+ .invoke_ffa_fn = sandbox_arm_ffa_smccc_smc,
+};
+
+static const struct udevice_id sandbox_ffa_emul_ids[] = {
+ { .compatible = "sandbox,arm-ffa-emul" },
+ { }
+};
+
+/* Declaring the sandbox FF-A emulator under UCLASS_FFA_EMUL */
+U_BOOT_DRIVER(sandbox_ffa_emul) = {
+ .name = "sandbox_ffa_emul",
+ .id = UCLASS_FFA_EMUL,
+ .of_match = sandbox_ffa_emul_ids,
+ .ops = &sandbox_ffa_emul_ops,
+ .priv_auto = sizeof(struct sandbox_ffa_emul),
+};
diff --git a/drivers/firmware/arm-ffa/sandbox_arm_ffa_priv.h
b/drivers/firmware/arm-ffa/sandbox_arm_ffa_priv.h
deleted file mode 100644
index 4338f9c9b1..0000000000
--- a/drivers/firmware/arm-ffa/sandbox_arm_ffa_priv.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * Copyright 2022-2023 Arm Limited and/or its affiliates
<open-source-off...@arm.com>
- *
- * Authors:
- * Abdellatif El Khlifi <abdellatif.elkhl...@arm.com>
- */
-
-#ifndef __SANDBOX_ARM_FFA_PRV_H
-#define __SANDBOX_ARM_FFA_PRV_H
-
-/* Future sandbox support private declarations */
-
-#endif
diff --git a/drivers/firmware/arm-ffa/sandbox_ffa.c
b/drivers/firmware/arm-ffa/sandbox_ffa.c
new file mode 100644
index 0000000000..bb150fd5cd
--- /dev/null
+++ b/drivers/firmware/arm-ffa/sandbox_ffa.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2022-2023 Arm Limited and/or its affiliates
<open-source-off...@arm.com>
+ *
+ * Authors:
+ * Abdellatif El Khlifi <abdellatif.elkhl...@arm.com>
+ */
+#include <common.h>
+#include <arm_ffa.h>
+#include <dm.h>
+#include <log.h>
+#include <asm/global_data.h>
+#include <asm/sandbox_arm_ffa_priv.h>
+#include <dm/device-internal.h>
+#include <linux/errno.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * ffa_set_smc_conduit() - Set the SMC conduit
+ *
+ * Selects the SMC conduit by setting the FF-A ABI invoke function.
+ * The function emulating the SMC call is provided by the FF-A emulator.
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+int ffa_set_smc_conduit(void)
+{
+ struct udevice *emul;
+ int ret;
+
+ ret = ffa_emul_find(NULL, &emul);
+ if (ret) {
+ log_err("[FFA][Sandbox] Cannot find FF-A emulator, SMC
emulation failure\n");
+ return -ENODEV;
+ }
+
+ if (!ffa_emul_get_ops(emul)->invoke_ffa_fn) {
+ log_err("[FFA][Sandbox] Cannot get FF-A emulator ops, SMC
emulation failure\n");
+ return -ENOSYS;
+ }
+
+ dscvry_info.invoke_ffa_fn = ffa_emul_get_ops(emul)->invoke_ffa_fn;
+ log_info("[FFA][Sandbox] Using emulated Arm SMC for FF-A conduit\n");
+
+ return 0;
+}
+
+/**
+ * sandbox_ffa_probe() - The sandbox FF-A driver probe function
+ * @dev: the sandbox Arm FF-A bus device (sandbox-arm-ffa)
+ *
+ * Probing is done through ffa_do_probe()
+ *
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_probe(struct udevice *dev)
+{
+ return ffa_do_probe(dev);
+}
+
+/**
+ * sandbox_ffa_bind() - The sandbox FF-A driver bind function
+ * @dev: the sandbox-arm-ffa device
+ * Tries to discover the emulated FF-A bus.
+ * Return:
+ *
+ * 0 on success.
+ */
+static int sandbox_ffa_bind(struct udevice *dev)
+{
+ bool ret;
+
+ log_info("[FFA][Sandbox] binding the device\n");
+
+ ret = ffa_try_discovery();
+ if (ret)
+ return 0;
+ else
+ return -ENODEV;
+}
+
+/* Sandbox Arm FF-A emulator operations */
+
+static const struct ffa_bus_ops sandbox_ffa_ops = {
+ .partition_info_get = ffa_get_partitions_info_hdlr,
+ .sync_send_receive = ffa_msg_send_direct_req_hdlr,
+ .rxtx_unmap = ffa_unmap_rxtx_buffers_hdlr,
+};
+
+static const struct udevice_id sandbox_ffa_id[] = {
+ { "sandbox,arm-ffa", 0 },
+ { },
+};
+
+/* Declaring the sandbox FF-A driver under UCLASS_FFA */
+U_BOOT_DRIVER(sandbox_arm_ffa) = {
+ .name = "sandbox_arm_ffa",
+ .of_match = sandbox_ffa_id,
+ .id = UCLASS_FFA,
+ .probe = sandbox_ffa_probe,
+ .bind = sandbox_ffa_bind,
+ .ops = &sandbox_ffa_ops,
+};
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index df77c7da58..4658411935 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -61,6 +61,7 @@ enum uclass_id {
UCLASS_ETH, /* Ethernet device */
UCLASS_ETH_PHY, /* Ethernet PHY device */
UCLASS_FFA, /* Arm Firmware Framework for Armv8-A */
+ UCLASS_FFA_EMUL, /* sandbox FF-A device emulator */
UCLASS_FIRMWARE, /* Firmware */
UCLASS_FPGA, /* FPGA device */
UCLASS_FUZZING_ENGINE, /* Fuzzing engine */
--
2.25.1
