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The performance protocol is intended for the performance management of group(s) of device(s) that run in the same performance domain. It includes even the CPUs. A performance domain is defined by a set of devices that always have to run at the same performance level. For example, a set of CPUs that share a voltage domain, and have a common frequency control, is said to be in the same performance domain. The commands in this protocol provide functionality to describe the protocol version, describe various attribute flags, set and get the performance level of a domain. It also supports discovery of the list of performance levels supported by a performance domain, and the properties of each performance level. This patch adds basic support for the performance protocol. Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
106 lines
3.1 KiB
C
106 lines
3.1 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/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_BITS 16
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#define PROTOCOL_REV_MINOR_MASK ((1U << PROTOCOL_REV_MINOR_BITS) - 1)
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#define PROTOCOL_REV_MAJOR(x) ((x) >> PROTOCOL_REV_MINOR_BITS)
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#define PROTOCOL_REV_MINOR(x) ((x) & PROTOCOL_REV_MINOR_MASK)
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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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*/
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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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void *con_priv;
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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_one_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_one_xfer_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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