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// 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 <linux/bitfield.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/scmi_protocol.h>
#include <linux/types.h>
#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 command being sent
* @protocol_id: The identifier of the protocol used to send @id command
* @seq: The token to identify the message. when a message/command 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: completion event
*/
struct scmi_xfer {
struct scmi_msg_hdr hdr;
struct scmi_msg tx;
struct scmi_msg rx;
struct completion 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_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);
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