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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
*/
#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 */