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