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This framework allows SCMI protocols to be installed and bound to the agent so that the agent can manage and utilize them later. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>
100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
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/*
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* Copyright (c) 2015-2019, Arm Limited and Contributors. All rights reserved.
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* Copyright (C) 2019-2020, Linaro Limited
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*
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* An SCMI agent device represent on communication path from a
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* device driver to the remote SCMI server which driver sends
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* messages to and receives response messages from.
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*/
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#ifndef SCMI_AGENT_H
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#define SCMI_AGENT_H
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#include <scmi_protocols.h>
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#include <asm/types.h>
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struct udevice;
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struct scmi_channel;
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/**
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* struct scmi_agent_proto_priv - Private data in device for SCMI agent
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* @channel: Reference to the SCMI channel to use
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*/
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struct scmi_agent_proto_priv {
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struct scmi_channel *channel;
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};
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/*
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* struct scmi_msg - Context of a SCMI message sent and the response received
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*
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* @protocol_id: SCMI protocol ID
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* @message_id: SCMI message ID for a defined protocol ID
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* @in_msg: Pointer to the message payload sent by the driver
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* @in_msg_sz: Byte size of the message payload sent
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* @out_msg: Pointer to buffer to store response message payload
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* @out_msg_sz: Byte size of the response buffer and response payload
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*/
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struct scmi_msg {
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unsigned int protocol_id;
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unsigned int message_id;
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u8 *in_msg;
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size_t in_msg_sz;
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u8 *out_msg;
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size_t out_msg_sz;
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};
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/* Helper macro to match a message on input/output array references */
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#define SCMI_MSG_IN(_protocol, _message, _in_array, _out_array) \
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(struct scmi_msg){ \
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.protocol_id = (_protocol), \
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.message_id = (_message), \
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.in_msg = (uint8_t *)&(_in_array), \
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.in_msg_sz = sizeof(_in_array), \
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.out_msg = (uint8_t *)&(_out_array), \
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.out_msg_sz = sizeof(_out_array), \
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}
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/**
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* devm_scmi_of_get_channel() - Get SCMI channel handle from SCMI agent DT node
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*
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* @dev: Device requesting a channel
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* @return 0 on success and a negative errno on failure
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*/
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int devm_scmi_of_get_channel(struct udevice *dev);
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/**
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* devm_scmi_process_msg() - Send and process an SCMI message
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*
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* Send a message to an SCMI server through a target SCMI agent device.
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* Caller sets scmi_msg::out_msg_sz to the output message buffer size.
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* On return, scmi_msg::out_msg_sz stores the response payload size.
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*
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* @dev: SCMI device
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* @msg: Message structure reference
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* Return: 0 on success and a negative errno on failure
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*/
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int devm_scmi_process_msg(struct udevice *dev, struct scmi_msg *msg);
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/**
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* scmi_get_protocol() - get protocol instance
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*
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* @dev: SCMI agent device
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* @id: SCMI protocol ID
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*
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* Obtain the device instance for given protocol ID, @id.
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*
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* Return: Pointer to the device if found, null otherwise
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*/
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struct udevice *scmi_get_protocol(struct udevice *dev,
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enum scmi_std_protocol id);
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/**
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* scmi_to_linux_errno() - Convert an SCMI error code into a Linux errno code
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*
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* @scmi_errno: SCMI error code value
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* Return: 0 for successful status and a negative errno otherwise
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*/
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int scmi_to_linux_errno(s32 scmi_errno);
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#endif /* SCMI_H */
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