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/*

Copyright (c) 2008 MIT

Permission is hereby granted, free of charge, to any person

obtaining a copy of this software and associated documentation

files (the "Software"), to deal in the Software without

restriction, including without limitation the rights to use,

copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the

Software is furnished to do so, subject to the following

conditions:

The above copyright notice and this permission notice shall be

included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

OTHER DEALINGS IN THE SOFTWARE.

Author: Kermin Fleming

*/

import PLBMasterWires::*;

import BRAMInitiatorWires::*;

import PLBMaster::*;

import BRAMFeeder::*;

import Interfaces::*;

import Parameters::*;

import FIFO::*;

import GetPut::*;

import Types::*;

import Memocode08Types::*;

import BRAMFIFO::*;

interface BRAMFIFOTester;

  interface PLBMasterWires                  plbMasterWires;

  interface BRAMInitiatorWires#(Bit#(14))   bramInitiatorWires;

endinterface

typedef enum{

  Idle,

  Running,

  Inputing,

  Outputing

} TesterState deriving (Bits,Eq);

module mkBRAMFIFOTester (BRAMFIFOTester);

  Feeder feeder <- mkBRAMFeeder();

  PLBMaster     plbMaster <- mkPLBMaster;

  Reg#(TesterState) state <- mkReg(Idle);

  Reg#(BlockAddr) baseRegLoad <- mkReg(0);

  Reg#(BlockAddr) baseRegStore <- mkReg(0);

  Reg#(Bit#(20)) commandCount <- mkReg(0);

  Reg#(Bit#(20)) maxCommands <- mkReg(0);

  FIFO#(Record) dataFIFO <- mkBRAMFIFO(8);

  rule grabInstruction(state == Idle);

    PPCMessage inst <- feeder.ppcMessageOutput.get;

    Bit#(5) size = truncate(pack(inst));

    maxCommands <= 1 << (size); // + 1 since we need R/W -2 for 4/bursts +1 for needing two iters

    commandCount <= 0;

    baseRegLoad <= 0;

    baseRegStore <= 0;

    state <= Running;

  endrule

  rule issueCommand(state == Running);

    commandCount <= commandCount + 1;

    if(commandCount + 1 == maxCommands)

      begin

        state <= Idle;

        feeder.ppcMessageInput.put(zeroExtend(pack(maxCommands)));

      end

    if(commandCount[1] == 0)

      begin

        baseRegLoad <= baseRegLoad + fromInteger(valueof(BlockSize));

        plbMaster.plbMasterCommandInput.put(tagged LoadPage (baseRegLoad));

      end

    else

      begin

        baseRegStore <= baseRegStore + fromInteger(valueof(BlockSize));

        plbMaster.plbMasterCommandInput.put(tagged StorePage (baseRegStore));

      end

  endrule

  rule inputing;

     Record data <- plbMaster.wordOutput.get;

     dataFIFO.enq(data);

  endrule

  rule outputing;

    plbMaster.wordInput.put(dataFIFO.first);

    dataFIFO.deq;

  endrule

  interface plbMasterWires = plbMaster.plbMasterWires;

  interface bramInitiatorWires = feeder.bramInitiatorWires;

endmodule