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https://github.com/brain-hackers/u-boot-brain
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1e35913a26
This change implements a SMCCC transport for SCMI exchanges. This implementation follows the Linux kernel as references implementation for SCMI message processing, using the SMT format for communication channel meta-data. Use of SMCCC transport in SCMI FDT bindings are defined in the Linux kernel DT bindings since v5.8. SMCCC with SMT is implemented in OP-TEE from tag 3.9.0 [2]. Links: [2] https://github.com/OP-TEE/optee_os/commit/a58c4d706d23 Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org> Cc: Simon Glass <sjg@chromium.org> Cc: Peng Fan <peng.fan@nxp.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Reviewed-by: Simon Glass <sjg@chromium.org>
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
// 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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#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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#include "smt.h"
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#define SMCCC_RET_NOT_SUPPORTED ((unsigned long)-1)
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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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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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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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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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scmi_clear_smt_channel(&chan->smt);
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return ret;
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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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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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chan->func_id = func_id;
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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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return 0;
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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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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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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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