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//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2015 Authors and OPENCORES.ORG                 ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file is free software; you can redistribute it   ////

//// and/or modify it under the terms of the GNU Lesser General   ////

//// Public License as published by the Free Software Foundation; ////

//// either version 2.1 of the License, or (at your option) any   ////

//// later version.                                               ////

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//// This source is distributed in the hope that it will be       ////

//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////

//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////

//// PURPOSE.  See the GNU Lesser General Public License for more ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

// --------------------------------------------------------------------

//

package pcie_monitor_pkg;

  typedef enum

  {

    MRd,      // Memory Read Request

    MRdLk,    // Memory Read Request-Locked

    MWr,      // Memory Write Request

    IORd,     // I/O Read Request

    IOWr,     // I/O Write Request

    CfgRd0,   // Configuration Read Type

    CfgWr0,   // Configuration Write Type

    CfgRd1,   // Configuration Read Type

    CfgWr1,   // Configuration Write Type

    TCfgRd,   // Deprecated TLP Type3

    TCfgWr,   // Deprecated TLP Type3

    Msg,      // Message Request

    MsgD,     // Message Request with data payload

    Cpl,      // Completion without Data

    CplD,     // Completion with Data

    CplLk,    // Completion for Locked Memory Read without Data

    CplDLk,   // Completion for Locked Memory Read

    FetchAdd, // Fetch and Add AtomicOp Request

    Swap,     // Unconditional Swap AtomicOp Request

    CAS,      // Compare and Swap AtomicOp Request

    LPrfx,    // Local TLP Prefix

    EPrfx,    // End-End TLP Prefix

    Reserved

  } tlp_type_t;

  typedef enum

  {

    ROUTING_UNKNOWN,

    ADDRESS,

    ID,

    IMPLICIT

  } tlp_routing_t;

  typedef enum

  {

    TRANSACTION_UNKNOWN,

    REQUESTER,

    COMPLETER

  } tlp_transaction_t;

  // --------------------------------------------------------------------

  //

  class base_tlp_packet_class;

    tlp_type_t        header_type       = Reserved;

    tlp_routing_t     routing_type      = ROUTING_UNKNOWN;

    tlp_transaction_t transaction_type  = TRANSACTION_UNKNOWN;

    logic [7:0] fmt_type;

    logic [2:0] tc;

    logic       th;

    logic [2:0] attr;

    logic       td;

    logic       ep;

    logic [9:0] length;

    logic [7:0] header [16];

    logic       header_is_4_dw;

    // --------------------------------------------------------------------

    //

    function tlp_type_t get_tlp_type(logic [7:0] fmt_type);

      casez(fmt_type)

        8'b000_00000: get_tlp_type = MRd;

        8'b001_00000: get_tlp_type = MRd;

        8'b000_00001: get_tlp_type = MRdLk;

        8'b001_00001: get_tlp_type = MRdLk;

        8'b010_00000: get_tlp_type = MWr;

        8'b011_00000: get_tlp_type = MWr;

        8'b000_00010: get_tlp_type = IORd;

        8'b010_00010: get_tlp_type = IOWr;

        8'b000_00100: get_tlp_type = CfgRd0;

        8'b010_00100: get_tlp_type = CfgWr0;

        8'b000_00101: get_tlp_type = CfgRd1;

        8'b010_00101: get_tlp_type = CfgWr1;

        8'b000_11011: get_tlp_type = TCfgRd;

        8'b010_11011: get_tlp_type = TCfgWr;

        8'b001_10???: get_tlp_type = Msg;

        8'b011_10???: get_tlp_type = MsgD;

        8'b000_01010: get_tlp_type = Cpl;

        8'b010_01010: get_tlp_type = CplD;

        8'b000_01011: get_tlp_type = CplLk;

        8'b010_01011: get_tlp_type = CplDLk;

        8'b010_01100: get_tlp_type = FetchAdd;

        8'b011_01100: get_tlp_type = FetchAdd;

        8'b010_01101: get_tlp_type = Swap;

        8'b011_01101: get_tlp_type = Swap;

        8'b010_01110: get_tlp_type = CAS;

        8'b011_01110: get_tlp_type = CAS;

        8'b100_0????: get_tlp_type = LPrfx;

        8'b100_1????: get_tlp_type = EPrfx;

        default:      get_tlp_type = Reserved;

      endcase

    endfunction: get_tlp_type

    // --------------------------------------------------------------------

    //

    function tlp_routing_t get_tlp_routing(tlp_type_t tlp_type);

      case(tlp_type)

        MRd:      get_tlp_routing = ADDRESS;

        MRdLk:    get_tlp_routing = ADDRESS;

        MWr:      get_tlp_routing = ADDRESS;

        IORd:     get_tlp_routing = ADDRESS;

        IOWr:     get_tlp_routing = ADDRESS;

        CfgRd0:   get_tlp_routing = ID;

        CfgWr0:   get_tlp_routing = ID;

        CfgRd1:   get_tlp_routing = ID;

        CfgWr1:   get_tlp_routing = ID;

        TCfgRd:   get_tlp_routing = ID;

        TCfgWr:   get_tlp_routing = ID;

        Msg:      get_tlp_routing = ROUTING_UNKNOWN;

        MsgD:     get_tlp_routing = ROUTING_UNKNOWN;

        Cpl:      get_tlp_routing = ID;

        CplD:     get_tlp_routing = ID;

        CplLk:    get_tlp_routing = ID;

        CplDLk:   get_tlp_routing = ID;

        FetchAdd: get_tlp_routing = ROUTING_UNKNOWN;

        Swap:     get_tlp_routing = ROUTING_UNKNOWN;

        CAS:      get_tlp_routing = ROUTING_UNKNOWN;

        LPrfx:    get_tlp_routing = ROUTING_UNKNOWN;

        EPrfx:    get_tlp_routing = ROUTING_UNKNOWN;

        default:  get_tlp_routing = ROUTING_UNKNOWN;

      endcase

    endfunction: get_tlp_routing

    // --------------------------------------------------------------------

    //

    function tlp_transaction_t get_tlp_transaction(tlp_type_t tlp_type);

      case(tlp_type)

        MRd:      get_tlp_transaction = REQUESTER;

        MRdLk:    get_tlp_transaction = REQUESTER;

        MWr:      get_tlp_transaction = REQUESTER;

        IORd:     get_tlp_transaction = REQUESTER;

        IOWr:     get_tlp_transaction = REQUESTER;

        CfgRd0:   get_tlp_transaction = REQUESTER;

        CfgWr0:   get_tlp_transaction = REQUESTER;

        CfgRd1:   get_tlp_transaction = REQUESTER;

        CfgWr1:   get_tlp_transaction = REQUESTER;

        TCfgRd:   get_tlp_transaction = REQUESTER;

        TCfgWr:   get_tlp_transaction = REQUESTER;

        Msg:      get_tlp_transaction = REQUESTER;

        MsgD:     get_tlp_transaction = REQUESTER;

        Cpl:      get_tlp_transaction = COMPLETER;

        CplD:     get_tlp_transaction = COMPLETER;

        CplLk:    get_tlp_transaction = COMPLETER;

        CplDLk:   get_tlp_transaction = COMPLETER;

        FetchAdd: get_tlp_transaction = TRANSACTION_UNKNOWN;

        Swap:     get_tlp_transaction = TRANSACTION_UNKNOWN;

        CAS:      get_tlp_transaction = TRANSACTION_UNKNOWN;

        LPrfx:    get_tlp_transaction = TRANSACTION_UNKNOWN;

        EPrfx:    get_tlp_transaction = TRANSACTION_UNKNOWN;

        default:  get_tlp_transaction = TRANSACTION_UNKNOWN;

      endcase

    endfunction: get_tlp_transaction

    // --------------------------------------------------------------------

    //

    function void display_tlp_cfg(tlp_type_t tlp_type);

      logic [5:0] Register_Number = header[11][7:2];

      logic [3:0] Extended_Register_Number = header[10][3:0];

      // $display("??? %16.t | Register_Number           = %b", $time, Register_Number);

      // $display("??? %16.t | Extended_Register_Number  = %b", $time, Extended_Register_Number);

      $display("??? %16.t | config offset             = 0x%5.x",

                $time, {Extended_Register_Number, Register_Number, 2'b00});

    endfunction: display_tlp_cfg

    // --------------------------------------------------------------------

    //

    function void display_tlp_type(tlp_type_t tlp_type);

      case(tlp_type)

        // MRd:      get_tlp_transaction = REQUESTER;

        // MRdLk:    get_tlp_transaction = REQUESTER;

        // MWr:      get_tlp_transaction = REQUESTER;

        // IORd:     get_tlp_transaction = REQUESTER;

        // IOWr:     get_tlp_transaction = REQUESTER;

        CfgRd0:   display_tlp_cfg(tlp_type);

        CfgWr0:   display_tlp_cfg(tlp_type);

        CfgRd1:   display_tlp_cfg(tlp_type);

        CfgWr1:   display_tlp_cfg(tlp_type);

        TCfgRd:   display_tlp_cfg(tlp_type);

        TCfgWr:   display_tlp_cfg(tlp_type);

        // Msg:      get_tlp_transaction = REQUESTER;

        // MsgD:     get_tlp_transaction = REQUESTER;

        // Cpl:      get_tlp_transaction = COMPLETER;

        // CplD:     get_tlp_transaction = COMPLETER;

        // CplLk:    get_tlp_transaction = COMPLETER;

        // CplDLk:   get_tlp_transaction = COMPLETER;

        // FetchAdd: get_tlp_transaction = TRANSACTION_UNKNOWN;

        // Swap:     get_tlp_transaction = TRANSACTION_UNKNOWN;

        // CAS:      get_tlp_transaction = TRANSACTION_UNKNOWN;

        // LPrfx:    get_tlp_transaction = TRANSACTION_UNKNOWN;

        // EPrfx:    get_tlp_transaction = TRANSACTION_UNKNOWN;

        default:  return;

      endcase

    endfunction: display_tlp_type

    // --------------------------------------------------------------------

    //

    function void set_little_endian_header( logic [127:0] data);

      logic [2:0] fmt = data[7:5];

      if(fmt > 3'b011)

      begin

        $display("!!! %16.t | fmt 3'b%b not supported", $time, fmt);

        $stop;

      end

      header_is_4_dw = data[5];

      for(int i = 0; i < (header_is_4_dw ? 16 : 12); i += 4)

        {header[i + 0], header[i + 1], header[i + 2], header[i + 3]} = data[i*8 +: 32];

      header_type      = get_tlp_type(header[0]);

      routing_type     = get_tlp_routing(header_type);

      transaction_type = get_tlp_transaction(header_type);

      fmt_type = header[0];

      tc       = header[1][6:4];

      th       = header[1][0];

      attr     = {header[1][2], header[2][5:4]};

      td       = header[2][7];

      ep       = header[2][6];

      length   = {header[2][1:0], header[3]};

    endfunction: set_little_endian_header

    // --------------------------------------------------------------------

    //

    function void display_header(string str);

      $display("??? %16.t | .....................", $time);

      $display("??? %16.t | %s | TLP type | %s", $time, str, header_type.name);

      // $display("??? %16.t | fmt           = %b | type = %b", $time, fmt_type[7:5], fmt_type[4:0]);

      $display("??? %16.t | length = %d", $time, length);

      $display("??? %16.t | tc = %b | th = %b | attr = %b | td = %b | ep = %b",

                $time, tc, th, attr, td, ep);

      if(routing_type == ADDRESS)

        if(header_is_4_dw)

          $display("??? %16.t | address[63:0] = 0x%16.x", $time,

                    { header[8],  header[9],  header[10], header[11],

                      header[12], header[13], header[14], header[15][7:2], 2'b00});

        else

          $display("??? %16.t | address[31:0] = 0x%8.x", $time,

                    { header[8],  header[9],  header[10], header[11][7:2], 2'b00});

      else if(routing_type == ID)

          $display("??? %16.t | bus = 0x%2.x | device = 0x%x | function = 0x%x", $time,

                    header[8],  header[9][7:3],  header[9][2:0]);

      if(transaction_type == COMPLETER)

      begin

        $display("??? %16.t | Completer ID  = %b", $time, {header[4], header[5]});

        $display("??? %16.t | requester ID  = %b", $time, {header[8], header[9]});

        $display("??? %16.t | tag           = %b", $time, header[10]);

      end

      else

      begin

        $display("??? %16.t | requester ID  = %b", $time, {header[4], header[5]});

        $display("??? %16.t | tag           = %b", $time, header[6]);

        $display("??? %16.t | last DW BE = %b | first DW BE = %b",

                  $time, header[7][7:4], header[7][3:0]);

      end

      display_tlp_type(header_type);

      $display("??? %16.t | ---------------------", $time);

    endfunction: display_header

    // //--------------------------------------------------------------------

    // //

    // function new;

    // endfunction: new

  // --------------------------------------------------------------------

  //

  endclass: base_tlp_packet_class

// --------------------------------------------------------------------

//

endpackage: pcie_monitor_pkg