238 lines
7.8 KiB
C
238 lines
7.8 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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#include <asm/unaligned.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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* @minor_version: Minor version of the ABI that firmware supports
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* @major_version: Major 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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#define MSG_ID_MASK GENMASK(7, 0)
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#define MSG_XTRACT_ID(hdr) FIELD_GET(MSG_ID_MASK, (hdr))
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#define MSG_TYPE_MASK GENMASK(9, 8)
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#define MSG_XTRACT_TYPE(hdr) FIELD_GET(MSG_TYPE_MASK, (hdr))
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#define MSG_TYPE_COMMAND 0
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#define MSG_TYPE_DELAYED_RESP 2
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#define MSG_TYPE_NOTIFICATION 3
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#define MSG_PROTOCOL_ID_MASK GENMASK(17, 10)
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#define MSG_XTRACT_PROT_ID(hdr) FIELD_GET(MSG_PROTOCOL_ID_MASK, (hdr))
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#define MSG_TOKEN_ID_MASK GENMASK(27, 18)
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#define MSG_XTRACT_TOKEN(hdr) FIELD_GET(MSG_TOKEN_ID_MASK, (hdr))
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#define MSG_TOKEN_MAX (MSG_XTRACT_TOKEN(MSG_TOKEN_ID_MASK) + 1)
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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 message being sent
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* @protocol_id: The identifier of the protocol used to send @id message
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* @seq: The token to identify the message. When a message returns, the
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* platform returns the whole message header unmodified including the
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* 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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* pack_scmi_header() - packs and returns 32-bit header
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*
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* @hdr: pointer to header containing all the information on message id,
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* protocol id and sequence id.
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*
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* Return: 32-bit packed message header to be sent to the platform.
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*/
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static inline u32 pack_scmi_header(struct scmi_msg_hdr *hdr)
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{
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return FIELD_PREP(MSG_ID_MASK, hdr->id) |
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FIELD_PREP(MSG_TOKEN_ID_MASK, hdr->seq) |
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FIELD_PREP(MSG_PROTOCOL_ID_MASK, hdr->protocol_id);
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}
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/**
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* unpack_scmi_header() - unpacks and records message and protocol id
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*
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* @msg_hdr: 32-bit packed message header sent from the platform
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* @hdr: pointer to header to fetch message and protocol id.
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*/
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static inline void unpack_scmi_header(u32 msg_hdr, struct scmi_msg_hdr *hdr)
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{
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hdr->id = MSG_XTRACT_ID(msg_hdr);
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hdr->protocol_id = MSG_XTRACT_PROT_ID(msg_hdr);
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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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* @transfer_id: Unique ID for debug & profiling purpose
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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: command message transmit completion event
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* @async_done: pointer to delayed response message received event completion
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*/
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struct scmi_xfer {
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int transfer_id;
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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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struct completion *async_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_do_xfer_with_response(const struct scmi_handle *h,
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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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/* SCMI Transport */
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/**
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* struct scmi_chan_info - Structure representing a SCMI channel information
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*
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* @dev: Reference to device in the SCMI hierarchy corresponding to this
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* channel
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* @handle: Pointer to SCMI entity handle
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* @transport_info: Transport layer related information
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*/
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struct scmi_chan_info {
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struct device *dev;
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struct scmi_handle *handle;
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void *transport_info;
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};
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/**
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* struct scmi_transport_ops - Structure representing a SCMI transport ops
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*
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* @chan_available: Callback to check if channel is available or not
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* @chan_setup: Callback to allocate and setup a channel
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* @chan_free: Callback to free a channel
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* @send_message: Callback to send a message
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* @mark_txdone: Callback to mark tx as done
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* @fetch_response: Callback to fetch response
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* @fetch_notification: Callback to fetch notification
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* @clear_channel: Callback to clear a channel
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* @poll_done: Callback to poll transfer status
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*/
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struct scmi_transport_ops {
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bool (*chan_available)(struct device *dev, int idx);
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int (*chan_setup)(struct scmi_chan_info *cinfo, struct device *dev,
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bool tx);
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int (*chan_free)(int id, void *p, void *data);
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int (*send_message)(struct scmi_chan_info *cinfo,
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struct scmi_xfer *xfer);
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void (*mark_txdone)(struct scmi_chan_info *cinfo, int ret);
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void (*fetch_response)(struct scmi_chan_info *cinfo,
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struct scmi_xfer *xfer);
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void (*fetch_notification)(struct scmi_chan_info *cinfo,
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size_t max_len, struct scmi_xfer *xfer);
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void (*clear_channel)(struct scmi_chan_info *cinfo);
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bool (*poll_done)(struct scmi_chan_info *cinfo, struct scmi_xfer *xfer);
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};
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/**
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* struct scmi_desc - Description of SoC integration
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*
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* @ops: Pointer to the transport specific ops structure
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* @max_rx_timeout_ms: Timeout for communication with SoC (in Milliseconds)
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* @max_msg: Maximum number of messages that can be pending
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* simultaneously in the system
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* @max_msg_size: Maximum size of data per message that can be handled.
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*/
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struct scmi_desc {
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struct scmi_transport_ops *ops;
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int max_rx_timeout_ms;
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int max_msg;
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int max_msg_size;
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};
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extern const struct scmi_desc scmi_mailbox_desc;
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#ifdef CONFIG_HAVE_ARM_SMCCC
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extern const struct scmi_desc scmi_smc_desc;
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#endif
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void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr);
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void scmi_free_channel(struct scmi_chan_info *cinfo, struct idr *idr, int id);
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/* shmem related declarations */
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struct scmi_shared_mem;
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void shmem_tx_prepare(struct scmi_shared_mem __iomem *shmem,
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struct scmi_xfer *xfer);
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u32 shmem_read_header(struct scmi_shared_mem __iomem *shmem);
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void shmem_fetch_response(struct scmi_shared_mem __iomem *shmem,
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struct scmi_xfer *xfer);
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void shmem_fetch_notification(struct scmi_shared_mem __iomem *shmem,
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size_t max_len, struct scmi_xfer *xfer);
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void shmem_clear_channel(struct scmi_shared_mem __iomem *shmem);
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bool shmem_poll_done(struct scmi_shared_mem __iomem *shmem,
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struct scmi_xfer *xfer);
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