arm_ffa: introduce sandbox FF-A support

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.elkhlifi@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Cc: Jens Wiklander <jens.wiklander@linaro.org>
Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>

1 files changed, 110 insertions, 0 deletions

diff --git a/drivers/firmware/arm-ffa/sandbox_ffa.c b/drivers/firmware/arm-ffa/sandbox_ffa.c
new file mode 100644
index 00000000000..ef9491ccead
--- /dev/null
+++ b/drivers/firmware/arm-ffa/sandbox_ffa.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2022-2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
+ *
+ * Authors:
+ *   Abdellatif El Khlifi <abdellatif.elkhlifi@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;
+
+/**
+ * sandbox_ffa_discover() - perform sandbox FF-A discovery
+ * @dev: The sandbox FF-A bus device
+ * Try to discover the FF-A framework. Discovery is performed by
+ * querying the FF-A framework version from secure world using the FFA_VERSION ABI.
+ * Return:
+ *
+ * 0 on success. Otherwise, failure
+ */
+static int sandbox_ffa_discover(struct udevice *dev)
+{
+	int ret;
+	struct udevice *emul;
+
+	log_info("Emulated FF-A framework discovery\n");
+
+	ret = ffa_emul_find(dev, &emul);
+	if (ret) {
+		log_err("Cannot find FF-A emulator\n");
+		return ret;
+	}
+
+	ret = ffa_get_version_hdlr(dev);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/**
+ * sandbox_ffa_probe() - The sandbox FF-A driver probe function
+ * @dev:	the sandbox-arm-ffa device
+ * Save the emulator device in uc_priv.
+ * Return:
+ *
+ * 0 on success.
+ */
+static int sandbox_ffa_probe(struct udevice *dev)
+{
+	int ret;
+	struct ffa_priv *uc_priv = dev_get_uclass_priv(dev);
+
+	ret = uclass_first_device_err(UCLASS_FFA_EMUL, &uc_priv->emul);
+	if (ret) {
+		log_err("Cannot find FF-A emulator\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * sandbox_ffa_bind() - The sandbox FF-A driver bind function
+ * @dev:	the sandbox-arm-ffa device
+ * Try to discover the emulated FF-A bus.
+ * Return:
+ *
+ * 0 on success.
+ */
+static int sandbox_ffa_bind(struct udevice *dev)
+{
+	int ret;
+
+	ret = sandbox_ffa_discover(dev);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/* 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,
+	.bind		= sandbox_ffa_bind,
+	.probe		= sandbox_ffa_probe,
+	.ops		= &sandbox_ffa_ops,
+};