mirror of https://gitee.com/openkylin/linux.git
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/* 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 */
|