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Current File : //lib/modules/4.18.0-513.11.1.el8_9.x86_64/source/include/soc/tegra/ivc.h
/*
 * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#ifndef __TEGRA_IVC_H

#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/types.h>

struct tegra_ivc_header;

struct tegra_ivc {
	struct device *peer;

	struct {
		struct tegra_ivc_header *channel;
		unsigned int position;
		dma_addr_t phys;
	} rx, tx;

	void (*notify)(struct tegra_ivc *ivc, void *data);
	void *notify_data;

	unsigned int num_frames;
	size_t frame_size;
};

/**
 * tegra_ivc_read_get_next_frame - Peek at the next frame to receive
 * @ivc		pointer of the IVC channel
 *
 * Peek at the next frame to be received, without removing it from
 * the queue.
 *
 * Returns a pointer to the frame, or an error encoded pointer.
 */
void *tegra_ivc_read_get_next_frame(struct tegra_ivc *ivc);

/**
 * tegra_ivc_read_advance - Advance the read queue
 * @ivc		pointer of the IVC channel
 *
 * Advance the read queue
 *
 * Returns 0, or a negative error value if failed.
 */
int tegra_ivc_read_advance(struct tegra_ivc *ivc);

/**
 * tegra_ivc_write_get_next_frame - Poke at the next frame to transmit
 * @ivc		pointer of the IVC channel
 *
 * Get access to the next frame.
 *
 * Returns a pointer to the frame, or an error encoded pointer.
 */
void *tegra_ivc_write_get_next_frame(struct tegra_ivc *ivc);

/**
 * tegra_ivc_write_advance - Advance the write queue
 * @ivc		pointer of the IVC channel
 *
 * Advance the write queue
 *
 * Returns 0, or a negative error value if failed.
 */
int tegra_ivc_write_advance(struct tegra_ivc *ivc);

/**
 * tegra_ivc_notified - handle internal messages
 * @ivc		pointer of the IVC channel
 *
 * This function must be called following every notification.
 *
 * Returns 0 if the channel is ready for communication, or -EAGAIN if a channel
 * reset is in progress.
 */
int tegra_ivc_notified(struct tegra_ivc *ivc);

/**
 * tegra_ivc_reset - initiates a reset of the shared memory state
 * @ivc		pointer of the IVC channel
 *
 * This function must be called after a channel is reserved before it is used
 * for communication. The channel will be ready for use when a subsequent call
 * to notify the remote of the channel reset.
 */
void tegra_ivc_reset(struct tegra_ivc *ivc);

size_t tegra_ivc_align(size_t size);
unsigned tegra_ivc_total_queue_size(unsigned queue_size);
int tegra_ivc_init(struct tegra_ivc *ivc, struct device *peer, void *rx,
		   dma_addr_t rx_phys, void *tx, dma_addr_t tx_phys,
		   unsigned int num_frames, size_t frame_size,
		   void (*notify)(struct tegra_ivc *ivc, void *data),
		   void *data);
void tegra_ivc_cleanup(struct tegra_ivc *ivc);

#endif /* __TEGRA_IVC_H */

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