/* SPDX-License-Identifier: GPL-2.0 */ /* * System Control and Management Interface (SCMI) Message Protocol * driver common header file containing some definitions, structures * and function prototypes used in all the different SCMI protocols. * * Copyright (C) 2018 ARM Ltd. */ #include #include #include #include #include #include #include #define PROTOCOL_REV_MINOR_MASK GENMASK(15, 0) #define PROTOCOL_REV_MAJOR_MASK GENMASK(31, 16) #define PROTOCOL_REV_MAJOR(x) (u16)(FIELD_GET(PROTOCOL_REV_MAJOR_MASK, (x))) #define PROTOCOL_REV_MINOR(x) (u16)(FIELD_GET(PROTOCOL_REV_MINOR_MASK, (x))) #define MAX_PROTOCOLS_IMP 16 #define MAX_OPPS 16 enum scmi_common_cmd { PROTOCOL_VERSION = 0x0, PROTOCOL_ATTRIBUTES = 0x1, PROTOCOL_MESSAGE_ATTRIBUTES = 0x2, }; /** * struct scmi_msg_resp_prot_version - Response for a message * * @major_version: Major version of the ABI that firmware supports * @minor_version: Minor version of the ABI that firmware supports * * In general, ABI version changes follow the rule that minor version increments * are backward compatible. Major revision changes in ABI may not be * backward compatible. * * Response to a generic message with message type SCMI_MSG_VERSION */ struct scmi_msg_resp_prot_version { __le16 minor_version; __le16 major_version; }; /** * struct scmi_msg_hdr - Message(Tx/Rx) header * * @id: The identifier of the message being sent * @protocol_id: The identifier of the protocol used to send @id message * @seq: The token to identify the message. When a message returns, the * platform returns the whole message header unmodified including the * token * @status: Status of the transfer once it's complete * @poll_completion: Indicate if the transfer needs to be polled for * completion or interrupt mode is used */ struct scmi_msg_hdr { u8 id; u8 protocol_id; u16 seq; u32 status; bool poll_completion; }; /** * struct scmi_msg - Message(Tx/Rx) structure * * @buf: Buffer pointer * @len: Length of data in the Buffer */ struct scmi_msg { void *buf; size_t len; }; /** * struct scmi_xfer - Structure representing a message flow * * @hdr: Transmit message header * @tx: Transmit message * @rx: Receive message, the buffer should be pre-allocated to store * message. If request-ACK protocol is used, we can reuse the same * buffer for the rx path as we use for the tx path. * @done: command message transmit completion event * @async: pointer to delayed response message received event completion */ struct scmi_xfer { struct scmi_msg_hdr hdr; struct scmi_msg tx; struct scmi_msg rx; struct completion done; struct completion *async_done; }; void scmi_xfer_put(const struct scmi_handle *h, struct scmi_xfer *xfer); int scmi_do_xfer(const struct scmi_handle *h, struct scmi_xfer *xfer); int scmi_do_xfer_with_response(const struct scmi_handle *h, struct scmi_xfer *xfer); int scmi_xfer_get_init(const struct scmi_handle *h, u8 msg_id, u8 prot_id, size_t tx_size, size_t rx_size, struct scmi_xfer **p); int scmi_handle_put(const struct scmi_handle *handle); struct scmi_handle *scmi_handle_get(struct device *dev); void scmi_set_handle(struct scmi_device *scmi_dev); int scmi_version_get(const struct scmi_handle *h, u8 protocol, u32 *version); void scmi_setup_protocol_implemented(const struct scmi_handle *handle, u8 *prot_imp); int scmi_base_protocol_init(struct scmi_handle *h);