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-rw-r--r--drivers/scmi-msg/common.h136
1 files changed, 136 insertions, 0 deletions
diff --git a/drivers/scmi-msg/common.h b/drivers/scmi-msg/common.h
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+++ b/drivers/scmi-msg/common.h
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+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Copyright (c) 2015-2019, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2019-2020, Linaro Limited
+ */
+#ifndef SCMI_MSG_COMMON_H
+#define SCMI_MSG_COMMON_H
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "base.h"
+#include "clock.h"
+#include "reset_domain.h"
+
+#define SCMI_VERSION 0x20000U
+#define SCMI_IMPL_VERSION 0U
+
+#define SCMI_PLAYLOAD_MAX 92U
+
+/*
+ * Copy name identifier in target buffer following the SCMI specification
+ * that state name identifier shall be a null terminated string.
+ */
+#define COPY_NAME_IDENTIFIER(_dst_array, _name) \
+ do { \
+ assert(strlen(_name) < sizeof(_dst_array)); \
+ strlcpy((_dst_array), (_name), sizeof(_dst_array)); \
+ } while (0)
+
+/* Common command identifiers shared by all procotols */
+enum scmi_common_message_id {
+ SCMI_PROTOCOL_VERSION = 0x000,
+ SCMI_PROTOCOL_ATTRIBUTES = 0x001,
+ SCMI_PROTOCOL_MESSAGE_ATTRIBUTES = 0x002
+};
+
+/* Common platform-to-agent (p2a) PROTOCOL_VERSION structure */
+struct scmi_protocol_version_p2a {
+ int32_t status;
+ uint32_t version;
+};
+
+/* Generic platform-to-agent (p2a) PROTOCOL_ATTRIBUTES structure */
+struct scmi_protocol_attributes_p2a {
+ int32_t status;
+ uint32_t attributes;
+};
+
+/* Generic agent-to-platform (a2p) PROTOCOL_MESSAGE_ATTRIBUTES structure */
+struct scmi_protocol_message_attributes_a2p {
+ uint32_t message_id;
+};
+
+/* Generic platform-to-agent (p2a) PROTOCOL_MESSAGE_ATTRIBUTES structure */
+struct scmi_protocol_message_attributes_p2a {
+ int32_t status;
+ uint32_t attributes;
+};
+
+/*
+ * struct scmi_msg - SCMI message context
+ *
+ * @agent_id: SCMI agent ID, safely set from secure world
+ * @protocol_id: SCMI protocol ID for the related message, set by caller agent
+ * @message_id: SCMI message ID for the related message, set by caller agent
+ * @in: Address of the incoming message payload copied in secure memory
+ * @in_size: Byte length of the incoming message payload, set by caller agent
+ * @out: Address of of the output message payload message in non-secure memory
+ * @out_size: Byte length of the provisionned output buffer
+ * @out_size_out: Byte length of the output message payload
+ */
+struct scmi_msg {
+ unsigned int agent_id;
+ unsigned int protocol_id;
+ unsigned int message_id;
+ char *in;
+ size_t in_size;
+ char *out;
+ size_t out_size;
+ size_t out_size_out;
+};
+
+/*
+ * Type scmi_msg_handler_t is used by procotol drivers to safely find
+ * the handler function for the incoming message ID.
+ */
+typedef void (*scmi_msg_handler_t)(struct scmi_msg *msg);
+
+/*
+ * scmi_msg_get_base_handler - Return a handler for a base message
+ * @msg - message to process
+ * Return a function handler for the message or NULL
+ */
+scmi_msg_handler_t scmi_msg_get_base_handler(struct scmi_msg *msg);
+
+/*
+ * scmi_msg_get_clock_handler - Return a handler for a clock message
+ * @msg - message to process
+ * Return a function handler for the message or NULL
+ */
+scmi_msg_handler_t scmi_msg_get_clock_handler(struct scmi_msg *msg);
+
+/*
+ * scmi_msg_get_rstd_handler - Return a handler for a reset domain message
+ * @msg - message to process
+ * Return a function handler for the message or NULL
+ */
+scmi_msg_handler_t scmi_msg_get_rstd_handler(struct scmi_msg *msg);
+
+/*
+ * Process Read, process and write response for input SCMI message
+ *
+ * @msg: SCMI message context
+ */
+void scmi_process_message(struct scmi_msg *msg);
+
+/*
+ * Write SCMI response payload to output message shared memory
+ *
+ * @msg: SCMI message context
+ * @payload: Output message payload
+ * @size: Byte size of output message payload
+ */
+void scmi_write_response(struct scmi_msg *msg, void *payload, size_t size);
+
+/*
+ * Write status only SCMI response payload to output message shared memory
+ *
+ * @msg: SCMI message context
+ * @status: SCMI status value returned to caller
+ */
+void scmi_status_response(struct scmi_msg *msg, int32_t status);
+#endif /* SCMI_MSG_COMMON_H */