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/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
/* Copyright (c) 2010-2012 Broadcom. All rights reserved. */
#ifndef VCHI_H_
#define VCHI_H_
/******************************************************************************
* Global defs
*****************************************************************************/
// Macros to manipulate 'FOURCC' values
#define MAKE_FOURCC(x) ((int32_t)((x[0] << 24) | (x[1] << 16) | (x[2] << 8) | x[3]))
// Opaque handle for a VCHIQ instance
struct vchiq_instance;
/******************************************************************************
* Global funcs - implementation is specific to which side you are on
* (local / remote)
*****************************************************************************/
// Routine used to initialise the vchi on both local + remote connections
extern int32_t vchi_initialise(struct vchiq_instance **instance);
extern int32_t vchi_connect(struct vchiq_instance *instance);
//When this is called, ensure that all services have no data pending.
//Bulk transfers can remain 'queued'
extern int32_t vchi_disconnect(struct vchiq_instance *instance);
/******************************************************************************
* Global service API
*****************************************************************************/
// Routine to open a named service
extern int vchi_service_open(struct vchiq_instance *instance,
struct vchiq_service_params *params,
unsigned *handle);
extern int32_t vchi_get_peer_version(unsigned handle, short *peer_version);
// Routine to close a named service
extern int32_t vchi_service_close(unsigned handle);
// Routine to increment ref count on a named service
extern int32_t vchi_service_use(unsigned handle);
// Routine to decrement ref count on a named service
extern int32_t vchi_service_release(unsigned handle);
/* Routine to send a message from kernel memory across a service */
extern int vchi_queue_kernel_message(unsigned handle, void *data,
unsigned int size);
// Routine to look at a message in place.
// The message is dequeued, so the caller is left holding it; the descriptor is
// filled in and must be released when the user has finished with the message.
struct vchiq_header *vchi_msg_hold(unsigned handle);
/*******************************************************************************
* Global service support API - operations on held messages
* and message iterators
******************************************************************************/
// Routine to release a held message after it has been processed
extern int32_t vchi_held_msg_release(unsigned handle, struct vchiq_header *message);
/******************************************************************************
* Global bulk API
*****************************************************************************/
// Routine to prepare interface for a transfer from the other side
extern int32_t vchi_bulk_queue_receive(unsigned handle,
void *data_dst,
uint32_t data_size,
enum vchiq_bulk_mode mode,
void *transfer_handle);
// Routine to queue up data ready for transfer to the other (once they have signalled they are ready)
extern int32_t vchi_bulk_queue_transmit(unsigned handle,
const void *data_src,
uint32_t data_size,
enum vchiq_bulk_mode mode,
void *transfer_handle);
/******************************************************************************
* Configuration plumbing
*****************************************************************************/
#endif /* VCHI_H_ */
/****************************** End of file **********************************/
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