/*
Copyright (c) 2012-2014, Broadcom Europe Ltd
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the copyright holder nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

// Contains the protypes for the vchi functions.

#ifndef VCHI_H_
#define VCHI_H_

#include "interface/vcos/vcos.h"
#include "interface/vchi/vchi_cfg.h"
#include "interface/vchi/vchi_common.h"
#include "interface/vchi/connections/connection.h"
#include "vchi_mh.h"


/******************************************************************************
 Global defs
 *****************************************************************************/

#define VCHI_SERVICE_HANDLE_INVALID 0

#define VCHI_BULK_ROUND_UP(x)     ((((unsigned long)(x))+VCHI_BULK_ALIGN-1) & ~(VCHI_BULK_ALIGN-1))
#define VCHI_BULK_ROUND_DOWN(x)   (((unsigned long)(x)) & ~(VCHI_BULK_ALIGN-1))
#define VCHI_BULK_ALIGN_NBYTES(x) (VCHI_BULK_ALIGNED(x) ? 0 : (VCHI_BULK_ALIGN - ((unsigned long)(x) & (VCHI_BULK_ALIGN-1))))

#ifdef USE_VCHIQ_ARM
#define VCHI_BULK_ALIGNED(x)      1
#else
#define VCHI_BULK_ALIGNED(x)      (((unsigned long)(x) & (VCHI_BULK_ALIGN-1)) == 0)
#endif

typedef struct 
{
   uint32_t version;
   uint32_t version_min;
} VCHI_VERSION_T;
#define VCHI_VERSION(v_) { v_, v_ }
#define VCHI_VERSION_EX(v_,m_) { v_, m_ }

typedef enum
{
   VCHI_VEC_POINTER,
   VCHI_VEC_HANDLE,
   VCHI_VEC_LIST
} VCHI_MSG_VECTOR_TYPE_T;

typedef struct vchi_msg_vector_ex {

   VCHI_MSG_VECTOR_TYPE_T type;
   union
   {
      // a memory handle
      struct
      {
         VCHI_MEM_HANDLE_T handle;
         uint32_t offset;
         int32_t vec_len;
      } handle;

      // an ordinary data pointer
      struct
      {
         const void *vec_base;
         int32_t vec_len;
      } ptr;

      // a nested vector list
      struct
      {
         struct vchi_msg_vector_ex *vec;
         uint32_t vec_len;
      } list;
   } u;
} VCHI_MSG_VECTOR_EX_T;


// Construct an entry in a msg vector for a pointer (p) of length (l)
#define VCHI_VEC_POINTER(p,l)  VCHI_VEC_POINTER, { { (VCHI_MEM_HANDLE_T)(p), (l) } }

// Construct an entry in a msg vector for a message handle (h), starting at offset (o) of length (l)
#define VCHI_VEC_HANDLE(h,o,l) VCHI_VEC_HANDLE,  { { (h), (o), (l) } }

// Macros to manipulate fourcc_t values
#define MAKE_FOURCC(x) ((fourcc_t)( (x[0] << 24) | (x[1] << 16) | (x[2] << 8) | x[3] ))
#define FOURCC_TO_CHAR(x) (x >> 24) & 0xFF,(x >> 16) & 0xFF,(x >> 8) & 0xFF, x & 0xFF


// Opaque service information
struct opaque_vchi_service_t;

// Descriptor for a held message. Allocated by client, initialised by vchi_msg_hold,
// vchi_msg_iter_hold or vchi_msg_iter_hold_next. Fields are for internal VCHI use only.
typedef struct
{
   struct opaque_vchi_service_t *service;
   void *message;
} VCHI_HELD_MSG_T;



// structure used to provide the information needed to open a server or a client
typedef struct {
   VCHI_VERSION_T version;
   vcos_fourcc_t service_id;
   VCHI_CONNECTION_T *connection;
   uint32_t rx_fifo_size;
   uint32_t tx_fifo_size;
   VCHI_CALLBACK_T callback;
   void *callback_param;
   vcos_bool_t want_unaligned_bulk_rx;    // client intends to receive bulk transfers of odd lengths or into unaligned buffers
   vcos_bool_t want_unaligned_bulk_tx;    // client intends to transmit bulk transfers of odd lengths or out of unaligned buffers
   vcos_bool_t want_crc;                  // client wants to check CRCs on (bulk) transfers. Only needs to be set at 1 end - will do both directions.
} SERVICE_CREATION_T;

// Opaque handle for a VCHI instance
typedef struct opaque_vchi_instance_handle_t *VCHI_INSTANCE_T;

// Opaque handle for a server or client
typedef unsigned int VCHI_SERVICE_HANDLE_T;

// Service registration & startup
typedef void (*VCHI_SERVICE_INIT)(VCHI_INSTANCE_T initialise_instance, VCHI_CONNECTION_T **connections, uint32_t num_connections);

typedef struct service_info_tag {
   const char * const vll_filename; /* VLL to load to start this service. This is an empty string if VLL is "static" */
   VCHI_SERVICE_INIT init;          /* Service initialisation function */
   void *vll_handle;                /* VLL handle; NULL when unloaded or a "static VLL" in build */
} SERVICE_INFO_T;

/******************************************************************************
 Global funcs - implementation is specific to which side you are on (local / remote)
 *****************************************************************************/

#ifdef __cplusplus
extern "C" {
#endif

extern /*@observer@*/ VCHI_CONNECTION_T * vchi_create_connection( const VCHI_CONNECTION_API_T * function_table,
                                                   const VCHI_MESSAGE_DRIVER_T * low_level);


// Routine used to initialise the vchi on both local + remote connections
extern int32_t vchi_initialise( VCHI_INSTANCE_T *instance_handle );

extern int32_t vchi_connect( VCHI_CONNECTION_T **connections,
                             const uint32_t num_connections,
                             VCHI_INSTANCE_T instance_handle );

//When this is called, ensure that all services have no data pending.
//Bulk transfers can remain 'queued'
extern int32_t vchi_disconnect( VCHI_INSTANCE_T instance_handle );

// Global control over bulk CRC checking
extern int32_t vchi_crc_control( VCHI_CONNECTION_T *connection,
                                 VCHI_CRC_CONTROL_T control );

// helper functions
extern void * vchi_allocate_buffer(VCHI_SERVICE_HANDLE_T handle, uint32_t *length);
extern void vchi_free_buffer(VCHI_SERVICE_HANDLE_T handle, void *address);
extern uint32_t vchi_current_time(VCHI_INSTANCE_T instance_handle);


/******************************************************************************
 Global service API
 *****************************************************************************/
// Routine to create a named service
extern int32_t vchi_service_create( VCHI_INSTANCE_T instance_handle,
                                    SERVICE_CREATION_T *setup,
                                    VCHI_SERVICE_HANDLE_T *handle );

// Routine to destroy a service
extern int32_t vchi_service_destroy( const VCHI_SERVICE_HANDLE_T handle );

// Routine to open a named service
extern int32_t vchi_service_open( VCHI_INSTANCE_T instance_handle,
                                  SERVICE_CREATION_T *setup,
                                  VCHI_SERVICE_HANDLE_T *handle);

extern int32_t vchi_get_peer_version( const VCHI_SERVICE_HANDLE_T handle,
                                      short *peer_version );

// Routine to close a named service
extern int32_t vchi_service_close( const VCHI_SERVICE_HANDLE_T handle );

// Routine to increment ref count on a named service
extern int32_t vchi_service_use( const VCHI_SERVICE_HANDLE_T handle );

// Routine to decrement ref count on a named service
extern int32_t vchi_service_release( const VCHI_SERVICE_HANDLE_T handle );

// Routine to set a control option for a named service
extern int32_t vchi_service_set_option( const VCHI_SERVICE_HANDLE_T handle,
                                        VCHI_SERVICE_OPTION_T option,
                                        int value);

// Routine to send a message across a service
extern int32_t vchi_msg_queue( VCHI_SERVICE_HANDLE_T handle,
                               const void *data,
                               uint32_t data_size,
                               VCHI_FLAGS_T flags,
                               void *msg_handle );

// scatter-gather (vector) and send message
int32_t vchi_msg_queuev_ex( VCHI_SERVICE_HANDLE_T handle,
                            VCHI_MSG_VECTOR_EX_T *vector,
                            uint32_t count,
                            VCHI_FLAGS_T flags,
                            void *msg_handle );

// legacy scatter-gather (vector) and send message, only handles pointers
int32_t vchi_msg_queuev( VCHI_SERVICE_HANDLE_T handle,
                         VCHI_MSG_VECTOR_T *vector,
                         uint32_t count,
                         VCHI_FLAGS_T flags,
                         void *msg_handle );

// Routine to receive a msg from a service
// Dequeue is equivalent to hold, copy into client buffer, release
extern int32_t vchi_msg_dequeue( VCHI_SERVICE_HANDLE_T handle,
                                 void *data,
                                 uint32_t max_data_size_to_read,
                                 uint32_t *actual_msg_size,
                                 VCHI_FLAGS_T flags );

// Routine to look at a message in place.
// The message is not dequeued, so a subsequent call to peek or dequeue
// will return the same message.
extern int32_t vchi_msg_peek( VCHI_SERVICE_HANDLE_T handle,
                              void **data,
                              uint32_t *msg_size,
                              VCHI_FLAGS_T flags );

// Routine to remove a message after it has been read in place with peek
// The first message on the queue is dequeued.
extern int32_t vchi_msg_remove( VCHI_SERVICE_HANDLE_T handle );

// 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.
extern int32_t vchi_msg_hold( VCHI_SERVICE_HANDLE_T handle,
                              void **data,        // } may be NULL, as info can be
                              uint32_t *msg_size, // } obtained from HELD_MSG_T
                              VCHI_FLAGS_T flags,
                              VCHI_HELD_MSG_T *message_descriptor );

// Initialise an iterator to look through messages in place
extern int32_t vchi_msg_look_ahead( VCHI_SERVICE_HANDLE_T handle,
                                    VCHI_MSG_ITER_T *iter,
                                    VCHI_FLAGS_T flags );

/******************************************************************************
 Global service support API - operations on held messages and message iterators
 *****************************************************************************/

// Routine to get the address of a held message
extern void *vchi_held_msg_ptr( const VCHI_HELD_MSG_T *message );

// Routine to get the size of a held message
extern int32_t vchi_held_msg_size( const VCHI_HELD_MSG_T *message );

// Routine to get the transmit timestamp as written into the header by the peer
extern uint32_t vchi_held_msg_tx_timestamp( const VCHI_HELD_MSG_T *message );

// Routine to get the reception timestamp, written as we parsed the header
extern uint32_t vchi_held_msg_rx_timestamp( const VCHI_HELD_MSG_T *message );

// Routine to release a held message after it has been processed
extern int32_t vchi_held_msg_release( VCHI_HELD_MSG_T *message );

// Indicates whether the iterator has a next message.
extern vcos_bool_t vchi_msg_iter_has_next( const VCHI_MSG_ITER_T *iter );

// Return the pointer and length for the next message and advance the iterator.
extern int32_t vchi_msg_iter_next( VCHI_MSG_ITER_T *iter,
                                   void **data,
                                   uint32_t *msg_size );

// Remove the last message returned by vchi_msg_iter_next.
// Can only be called once after each call to vchi_msg_iter_next.
extern int32_t vchi_msg_iter_remove( VCHI_MSG_ITER_T *iter );

// Hold the last message returned by vchi_msg_iter_next.
// Can only be called once after each call to vchi_msg_iter_next.
extern int32_t vchi_msg_iter_hold( VCHI_MSG_ITER_T *iter,
                                   VCHI_HELD_MSG_T *message );

// Return information for the next message, and hold it, advancing the iterator.
extern int32_t vchi_msg_iter_hold_next( VCHI_MSG_ITER_T *iter,
                                        void **data,        // } may be NULL
                                        uint32_t *msg_size, // }
                                        VCHI_HELD_MSG_T *message );


/******************************************************************************
 Global bulk API
 *****************************************************************************/

// Routine to prepare interface for a transfer from the other side
extern int32_t vchi_bulk_queue_receive( VCHI_SERVICE_HANDLE_T handle,
                                        void *data_dst,
                                        uint32_t data_size,
                                        VCHI_FLAGS_T flags,
                                        void *transfer_handle );


// Prepare interface for a transfer from the other side into relocatable memory.
int32_t vchi_bulk_queue_receive_reloc( const VCHI_SERVICE_HANDLE_T handle,
                                       VCHI_MEM_HANDLE_T h_dst,
                                       uint32_t offset,
                                       uint32_t data_size,
                                       const VCHI_FLAGS_T flags,
                                       void * const bulk_handle );

// Prepare interface for a transfer from the other side into relocatable memory.
int32_t vchi_bulk_queue_receive_reloc_func( const VCHI_SERVICE_HANDLE_T handle,
                                       VCHI_MEM_HANDLE_T h_dst,
                                       uint32_t offset,
                                       uint32_t data_size,
                                       const VCHI_FLAGS_T flags,
                                       void * const bulk_handle,
                                       int (*copy_pagelist)() );

// 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( VCHI_SERVICE_HANDLE_T handle,
                                         const void *data_src,
                                         uint32_t data_size,
                                         VCHI_FLAGS_T flags,
                                         void *transfer_handle );


/******************************************************************************
 Configuration plumbing
 *****************************************************************************/

// function prototypes for the different mid layers (the state info gives the different physical connections)
extern const VCHI_CONNECTION_API_T *single_get_func_table( void );
//extern const VCHI_CONNECTION_API_T *local_server_get_func_table( void );
//extern const VCHI_CONNECTION_API_T *local_client_get_func_table( void );

// declare all message drivers here
const VCHI_MESSAGE_DRIVER_T *vchi_mphi_message_driver_func_table( void );

#ifdef __cplusplus
}
#endif

extern int32_t vchi_bulk_queue_transmit_reloc( VCHI_SERVICE_HANDLE_T handle,
                                               VCHI_MEM_HANDLE_T h_src,
                                               uint32_t offset,
                                               uint32_t data_size,
                                               VCHI_FLAGS_T flags,
                                               void *transfer_handle );
#endif /* VCHI_H_ */

/****************************** End of file **********************************/
