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>
diff --git a/drivers/firmware/arm-ffa/sandbox_ffa.c b/drivers/firmware/arm-ffa/sandbox_ffa.c
new file mode 100644
index 0000000..ef9491c
--- /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,
+};