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101 lines
2.6 KiB
101 lines
2.6 KiB
/* 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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