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https://github.com/AsahiLinux/u-boot
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84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
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/*
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* Copyright (c) 2016, NVIDIA CORPORATION.
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#ifndef _MAILBOX_UCLASS_H
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#define _MAILBOX_UCLASS_H
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/* See mailbox_client.h for background documentation. */
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#include <mailbox_client.h>
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struct udevice;
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/**
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* struct mbox_ops - The functions that a mailbox driver must implement.
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*/
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struct mbox_ops {
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/**
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* of_xlate - Translate a client's device-tree (OF) mailbox specifier.
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*
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* The mailbox core calls this function as the first step in
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* implementing a client's mbox_get_by_*() call.
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*
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* If this function pointer is set to NULL, the mailbox core will use
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* a default implementation, which assumes #mbox-cells = <1>, and that
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* the DT cell contains a simple integer channel ID.
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*
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* At present, the mailbox API solely supports device-tree. If this
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* changes, other xxx_xlate() functions may be added to support those
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* other mechanisms.
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*
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* @chan: The channel to hold the translation result.
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* @args: The mailbox specifier values from device tree.
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* @return 0 if OK, or a negative error code.
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*/
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int (*of_xlate)(struct mbox_chan *chan,
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struct fdtdec_phandle_args *args);
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/**
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* request - Request a translated channel.
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*
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* The mailbox core calls this function as the second step in
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* implementing a client's mbox_get_by_*() call, following a successful
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* xxx_xlate() call.
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*
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* @chan: The channel to request; this has been filled in by a
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* previoux xxx_xlate() function call.
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* @return 0 if OK, or a negative error code.
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*/
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int (*request)(struct mbox_chan *chan);
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/**
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* free - Free a previously requested channel.
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*
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* This is the implementation of the client mbox_free() API.
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*
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* @chan: The channel to free.
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* @return 0 if OK, or a negative error code.
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*/
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int (*free)(struct mbox_chan *chan);
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/**
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* send - Send a message over a mailbox channel
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*
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* @chan: The channel to send to the message to.
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* @data: A pointer to the message to send.
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* @return 0 if OK, or a negative error code.
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*/
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int (*send)(struct mbox_chan *chan, const void *data);
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/**
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* recv - Receive any available message from the channel.
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*
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* This function does not block. If not message is immediately
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* available, the function should return an error.
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*
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* @chan: The channel to receive to the message from.
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* @data: A pointer to the buffer to hold the received message.
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* @return 0 if OK, -ENODATA if no message was available, or a negative
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* error code.
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*/
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int (*recv)(struct mbox_chan *chan, void *data);
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};
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#endif
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