/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
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*/
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#ifndef __TEGRA_IVC_H
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/types.h>
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struct tegra_ivc_header;
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struct tegra_ivc {
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struct device *peer;
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struct {
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struct tegra_ivc_header *channel;
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unsigned int position;
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dma_addr_t phys;
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} rx, tx;
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void (*notify)(struct tegra_ivc *ivc, void *data);
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void *notify_data;
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unsigned int num_frames;
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size_t frame_size;
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};
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/**
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* tegra_ivc_read_get_next_frame - Peek at the next frame to receive
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* @ivc pointer of the IVC channel
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*
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* Peek at the next frame to be received, without removing it from
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* the queue.
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*
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* Returns a pointer to the frame, or an error encoded pointer.
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*/
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void *tegra_ivc_read_get_next_frame(struct tegra_ivc *ivc);
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/**
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* tegra_ivc_read_advance - Advance the read queue
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* @ivc pointer of the IVC channel
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*
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* Advance the read queue
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*
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* Returns 0, or a negative error value if failed.
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*/
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int tegra_ivc_read_advance(struct tegra_ivc *ivc);
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/**
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* tegra_ivc_write_get_next_frame - Poke at the next frame to transmit
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* @ivc pointer of the IVC channel
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*
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* Get access to the next frame.
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*
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* Returns a pointer to the frame, or an error encoded pointer.
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*/
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void *tegra_ivc_write_get_next_frame(struct tegra_ivc *ivc);
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/**
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* tegra_ivc_write_advance - Advance the write queue
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* @ivc pointer of the IVC channel
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*
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* Advance the write queue
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*
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* Returns 0, or a negative error value if failed.
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*/
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int tegra_ivc_write_advance(struct tegra_ivc *ivc);
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/**
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* tegra_ivc_notified - handle internal messages
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* @ivc pointer of the IVC channel
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*
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* This function must be called following every notification.
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*
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* Returns 0 if the channel is ready for communication, or -EAGAIN if a channel
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* reset is in progress.
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*/
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int tegra_ivc_notified(struct tegra_ivc *ivc);
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/**
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* tegra_ivc_reset - initiates a reset of the shared memory state
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* @ivc pointer of the IVC channel
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*
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* This function must be called after a channel is reserved before it is used
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* for communication. The channel will be ready for use when a subsequent call
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* to notify the remote of the channel reset.
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*/
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void tegra_ivc_reset(struct tegra_ivc *ivc);
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size_t tegra_ivc_align(size_t size);
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unsigned tegra_ivc_total_queue_size(unsigned queue_size);
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int tegra_ivc_init(struct tegra_ivc *ivc, struct device *peer, void *rx,
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dma_addr_t rx_phys, void *tx, dma_addr_t tx_phys,
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unsigned int num_frames, size_t frame_size,
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void (*notify)(struct tegra_ivc *ivc, void *data),
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void *data);
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void tegra_ivc_cleanup(struct tegra_ivc *ivc);
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#endif /* __TEGRA_IVC_H */
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