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@@ -0,0 +1,89 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Copyright (C) 2020 Linaro Limited.
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+ */
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+
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+#include <common.h>
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+#include <dm.h>
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+#include <errno.h>
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+#include <scmi_agent.h>
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+#include <scmi_agent-uclass.h>
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+#include <dm/devres.h>
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+#include <dm/device-internal.h>
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+#include <linux/arm-smccc.h>
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+#include <linux/compat.h>
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+
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+#include "smt.h"
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+
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+#define SMCCC_RET_NOT_SUPPORTED ((unsigned long)-1)
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+
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+/**
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+ * struct scmi_smccc_channel - Description of an SCMI SMCCC transport
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+ * @func_id: SMCCC function ID used by the SCMI transport
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+ * @smt: Shared memory buffer
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+ */
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+struct scmi_smccc_channel {
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+ ulong func_id;
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+ struct scmi_smt smt;
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+};
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+
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+static int scmi_smccc_process_msg(struct udevice *dev, struct scmi_msg *msg)
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+{
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+ struct scmi_smccc_channel *chan = dev_get_priv(dev);
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+ struct arm_smccc_res res;
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+ int ret;
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+
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+ ret = scmi_write_msg_to_smt(dev, &chan->smt, msg);
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+ if (ret)
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+ return ret;
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+
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+ arm_smccc_smc(chan->func_id, 0, 0, 0, 0, 0, 0, 0, &res);
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+ if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
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+ ret = -ENXIO;
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+ else
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+ ret = scmi_read_resp_from_smt(dev, &chan->smt, msg);
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+
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+ scmi_clear_smt_channel(&chan->smt);
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+
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+ return ret;
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+}
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+
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+static int scmi_smccc_probe(struct udevice *dev)
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+{
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+ struct scmi_smccc_channel *chan = dev_get_priv(dev);
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+ u32 func_id;
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+ int ret;
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+
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+ if (dev_read_u32(dev, "arm,smc-id", &func_id)) {
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+ dev_err(dev, "Missing property func-id\n");
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+ return -EINVAL;
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+ }
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+
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+ chan->func_id = func_id;
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+
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+ ret = scmi_dt_get_smt_buffer(dev, &chan->smt);
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+ if (ret) {
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+ dev_err(dev, "Failed to get smt resources: %d\n", ret);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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+static const struct udevice_id scmi_smccc_ids[] = {
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+ { .compatible = "arm,scmi-smc" },
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+ { }
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+};
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+
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+static const struct scmi_agent_ops scmi_smccc_ops = {
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+ .process_msg = scmi_smccc_process_msg,
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+};
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+
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+U_BOOT_DRIVER(scmi_smccc) = {
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+ .name = "scmi-over-smccc",
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+ .id = UCLASS_SCMI_AGENT,
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+ .of_match = scmi_smccc_ids,
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+ .priv_auto_alloc_size = sizeof(struct scmi_smccc_channel),
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+ .probe = scmi_smccc_probe,
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+ .ops = &scmi_smccc_ops,
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+};
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