/**
 * Copyright (c) 2010-2012 Broadcom. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. 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.
 * 3. The names of the above-listed copyright holders may not be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2, as published by the Free
 * Software Foundation.
 *
 * 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 OWNER 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.
 */

#ifndef _VCHI_MESSAGE_H_
#define _VCHI_MESSAGE_H_

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/semaphore.h>

#include "interface/vchi/vchi_cfg_internal.h"
#include "interface/vchi/vchi_common.h"

typedef enum message_event_type {
   MESSAGE_EVENT_NONE,
   MESSAGE_EVENT_NOP,
   MESSAGE_EVENT_MESSAGE,
   MESSAGE_EVENT_SLOT_COMPLETE,
   MESSAGE_EVENT_RX_BULK_PAUSED,
   MESSAGE_EVENT_RX_BULK_COMPLETE,
   MESSAGE_EVENT_TX_COMPLETE,
   MESSAGE_EVENT_MSG_DISCARDED
} MESSAGE_EVENT_TYPE_T;

typedef enum vchi_msg_flags {
   VCHI_MSG_FLAGS_NONE                  = 0x0,
   VCHI_MSG_FLAGS_TERMINATE_DMA         = 0x1
} VCHI_MSG_FLAGS_T;

typedef enum message_tx_channel {
   MESSAGE_TX_CHANNEL_MESSAGE           = 0,
   MESSAGE_TX_CHANNEL_BULK              = 1 // drivers may provide multiple bulk channels, from 1 upwards
} MESSAGE_TX_CHANNEL_T;

// Macros used for cycling through bulk channels
#define MESSAGE_TX_CHANNEL_BULK_PREV(c) (MESSAGE_TX_CHANNEL_BULK+((c)-MESSAGE_TX_CHANNEL_BULK+VCHI_MAX_BULK_TX_CHANNELS_PER_CONNECTION-1)%VCHI_MAX_BULK_TX_CHANNELS_PER_CONNECTION)
#define MESSAGE_TX_CHANNEL_BULK_NEXT(c) (MESSAGE_TX_CHANNEL_BULK+((c)-MESSAGE_TX_CHANNEL_BULK+1)%VCHI_MAX_BULK_TX_CHANNELS_PER_CONNECTION)

typedef enum message_rx_channel {
   MESSAGE_RX_CHANNEL_MESSAGE           = 0,
   MESSAGE_RX_CHANNEL_BULK              = 1 // drivers may provide multiple bulk channels, from 1 upwards
} MESSAGE_RX_CHANNEL_T;

// Message receive slot information
typedef struct rx_msg_slot_info {

   struct rx_msg_slot_info *next;
   //struct slot_info *prev;
#if !defined VCHI_COARSE_LOCKING
   struct semaphore   sem;
#endif

   uint8_t           *addr;               // base address of slot
   uint32_t           len;                // length of slot in bytes

   uint32_t           write_ptr;          // hardware causes this to advance
   uint32_t           read_ptr;           // this module does the reading
   int                active;             // is this slot in the hardware dma fifo?
   uint32_t           msgs_parsed;        // count how many messages are in this slot
   uint32_t           msgs_released;      // how many messages have been released
   void              *state;              // connection state information
   uint8_t            ref_count[VCHI_MAX_SERVICES_PER_CONNECTION];          // reference count for slots held by services
} RX_MSG_SLOTINFO_T;

// The message driver no longer needs to know about the fields of RX_BULK_SLOTINFO_T - sort this out.
// In particular, it mustn't use addr and len - they're the client buffer, but the message
// driver will be tasked with sending the aligned core section.
typedef struct rx_bulk_slotinfo_t {
   struct rx_bulk_slotinfo_t *next;

   struct semaphore *blocking;

   // needed by DMA
   void        *addr;
   uint32_t     len;

   // needed for the callback
   void        *service;
   void        *handle;
   VCHI_FLAGS_T flags;
} RX_BULK_SLOTINFO_T;

/* ----------------------------------------------------------------------
 * each connection driver will have a pool of the following struct.
 *
 * the pool will be managed by vchi_qman_*
 * this means there will be multiple queues (single linked lists)
 * a given struct message_info will be on exactly one of these queues
 * at any one time
 * -------------------------------------------------------------------- */
typedef struct rx_message_info {

   struct message_info *next;
   //struct message_info *prev;

   uint8_t    *addr;
   uint32_t   len;
   RX_MSG_SLOTINFO_T *slot; // points to whichever slot contains this message
   uint32_t   tx_timestamp;
   uint32_t   rx_timestamp;

} RX_MESSAGE_INFO_T;

typedef struct {
   MESSAGE_EVENT_TYPE_T type;

   struct {
      // for messages
      void    *addr;           // address of message
      uint16_t slot_delta;     // whether this message indicated slot delta
      uint32_t len;            // length of message
      RX_MSG_SLOTINFO_T *slot; // slot this message is in
      int32_t  service;   // service id this message is destined for
      uint32_t tx_timestamp;   // timestamp from the header
      uint32_t rx_timestamp;   // timestamp when we parsed it
   } message;

   // FIXME: cleanup slot reporting...
   RX_MSG_SLOTINFO_T *rx_msg;
   RX_BULK_SLOTINFO_T *rx_bulk;
   void *tx_handle;
   MESSAGE_TX_CHANNEL_T tx_channel;

} MESSAGE_EVENT_T;

// callbacks
typedef void VCHI_MESSAGE_DRIVER_EVENT_CALLBACK_T( void *state );

typedef struct {
   VCHI_MESSAGE_DRIVER_EVENT_CALLBACK_T *event_callback;
} VCHI_MESSAGE_DRIVER_OPEN_T;

// handle to this instance of message driver (as returned by ->open)
typedef struct opaque_mhandle_t *VCHI_MDRIVER_HANDLE_T;

struct opaque_vchi_message_driver_t {
   VCHI_MDRIVER_HANDLE_T *(*open)( VCHI_MESSAGE_DRIVER_OPEN_T *params, void *state );
   int32_t (*suspending)( VCHI_MDRIVER_HANDLE_T *handle );
   int32_t (*resumed)( VCHI_MDRIVER_HANDLE_T *handle );
   int32_t (*power_control)( VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T, int32_t enable );
   int32_t (*add_msg_rx_slot)( VCHI_MDRIVER_HANDLE_T *handle, RX_MSG_SLOTINFO_T *slot );      // rx message
   int32_t (*add_bulk_rx)( VCHI_MDRIVER_HANDLE_T *handle, void *data, uint32_t len, RX_BULK_SLOTINFO_T *slot );  // rx data (bulk)
   int32_t (*send)( VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T channel, const void *data, uint32_t len, VCHI_MSG_FLAGS_T flags, void *send_handle );      // tx (message & bulk)
   void    (*next_event)( VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_EVENT_T *event );     // get the next event from message_driver
   int32_t (*enable)( VCHI_MDRIVER_HANDLE_T *handle );
   int32_t (*form_message)( VCHI_MDRIVER_HANDLE_T *handle, int32_t service_id, VCHI_MSG_VECTOR_T *vector, uint32_t count, void
                            *address, uint32_t length_avail, uint32_t max_total_length, int32_t pad_to_fill, int32_t allow_partial );

   int32_t (*update_message)( VCHI_MDRIVER_HANDLE_T *handle, void *dest, int16_t *slot_count );
   int32_t (*buffer_aligned)( VCHI_MDRIVER_HANDLE_T *handle, int tx, int uncached, const void *address, const uint32_t length );
   void *  (*allocate_buffer)( VCHI_MDRIVER_HANDLE_T *handle, uint32_t *length );
   void    (*free_buffer)( VCHI_MDRIVER_HANDLE_T *handle, void *address );
   int     (*rx_slot_size)( VCHI_MDRIVER_HANDLE_T *handle, int msg_size );
   int     (*tx_slot_size)( VCHI_MDRIVER_HANDLE_T *handle, int msg_size );

   int32_t  (*tx_supports_terminate)( const VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T channel );
   uint32_t (*tx_bulk_chunk_size)( const VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T channel );
   int     (*tx_alignment)( const VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T channel );
   int     (*rx_alignment)( const VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_RX_CHANNEL_T channel );
   void    (*form_bulk_aux)( VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T channel, const void *data, uint32_t len, uint32_t chunk_size, const void **aux_data, int32_t *aux_len );
   void    (*debug)( VCHI_MDRIVER_HANDLE_T *handle );
};

#endif // _VCHI_MESSAGE_H_

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