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