gem5/src/systemc/tests/include/SimpleATInitiator2.h

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  more contributor license agreements.  See the NOTICE file distributed
  with this work for additional information regarding copyright ownership.
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//====================================================================
//  Nov 06, 2008
//
//  Updated by:
//    Xiaopeng Qiu, JEDA Technologies, Inc
//    Email:  qiuxp@jedatechnologies.net
//
//  To fix violations of TLM2.0 rules, which are detected by JEDA 
//  TLM2.0 checker.
//
//====================================================================

#ifndef __SIMPLE_AT_INITIATOR2_H__
#define __SIMPLE_AT_INITIATOR2_H__

#include "tlm.h"
#include "tlm_utils/simple_initiator_socket.h"
//#include <systemc>
#include <cassert>
#include <queue>
//#include <iostream>

class SimpleATInitiator2 : public sc_core::sc_module
{
public:
  typedef tlm::tlm_generic_payload                   transaction_type;
  typedef tlm::tlm_phase                             phase_type;
  typedef tlm::tlm_sync_enum                         sync_enum_type;
  typedef tlm_utils::simple_initiator_socket<SimpleATInitiator2>  initiator_socket_type;

public:
  // extended transaction, holds tlm_generic_payload + data storage
  template <typename DT>
  class MyTransaction : public transaction_type
  {
  public:
    MyTransaction()
    {
      this->set_data_ptr(reinterpret_cast<unsigned char*>(&mData));
    }
    MyTransaction(tlm::tlm_mm_interface* mm) : transaction_type(mm)
    {
      this->set_data_ptr(reinterpret_cast<unsigned char*>(&mData));
    }

    void setData(DT& data) { mData = data; }
    DT getData() const { return mData; }

  private:
    DT mData;
  };
  typedef MyTransaction<unsigned int>  mytransaction_type;

  // Dummy Transaction Pool
  class SimplePool : public tlm::tlm_mm_interface
  {
  public:
    SimplePool() {}
    mytransaction_type* claim()
    { 
      mytransaction_type* t = new mytransaction_type(this);
      t->acquire();
      return t;
    }
    void release(mytransaction_type* t)
    {
      t->release();
    }
    void free(tlm::tlm_generic_payload* t)
    {
      t->reset(); 
      delete t;
    }
  };

public:
  initiator_socket_type socket;

public:
  SC_HAS_PROCESS(SimpleATInitiator2);
  SimpleATInitiator2(sc_core::sc_module_name name,
                     unsigned int nrOfTransactions = 0x5,
                     unsigned int baseAddress = 0) :
    sc_core::sc_module(name),
    socket("socket"),
    ACCEPT_DELAY(10, sc_core::SC_NS),
    mNrOfTransactions(nrOfTransactions),
    mBaseAddress(baseAddress),
    mTransactionCount(0),
    mCurrentTransaction(0)
  {
    // register nb_transport method
    socket.register_nb_transport_bw(this, &SimpleATInitiator2::myNBTransport);

    // Initiator thread
    SC_THREAD(run);
  }

  bool initTransaction(mytransaction_type*& trans)
  {
    if (mTransactionCount < mNrOfTransactions) {
      trans = transPool.claim();
      trans->set_address(mBaseAddress + 4*mTransactionCount);
      trans->setData(mTransactionCount);
      trans->set_command(tlm::TLM_WRITE_COMMAND);

    } else if (mTransactionCount < 2 * mNrOfTransactions) {
      trans = transPool.claim();
      trans->set_address(mBaseAddress + 4*(mTransactionCount - mNrOfTransactions));
      trans->set_command(tlm::TLM_READ_COMMAND);

    } else {
      return false;
    }

    trans->set_data_length(4);
    trans->set_streaming_width(4);

    ++mTransactionCount;
    return true;
  }

  void logStartTransation(mytransaction_type& trans)
  {
    if (trans.get_command() == tlm::TLM_WRITE_COMMAND) {
      std::cout << name() << ": Send write request: A = 0x"
                << std::hex << (unsigned int)trans.get_address()
                << ", D = 0x" << trans.getData() << std::dec
                << " @ " << sc_core::sc_time_stamp() << std::endl;
      
    } else {
      std::cout << name() << ": Send read request: A = 0x"
                << std::hex << (unsigned int)trans.get_address() << std::dec
                << " @ " << sc_core::sc_time_stamp() << std::endl;
    }
  }

  void logEndTransaction(mytransaction_type& trans)
  {
    if (trans.get_response_status() != tlm::TLM_OK_RESPONSE) {
      std::cout << name() << ": Received error response @ "
                << sc_core::sc_time_stamp() << std::endl;

    } else {
      std::cout << name() <<  ": Received ok response";
      if (trans.get_command() == tlm::TLM_READ_COMMAND) {
        std::cout << ": D = 0x" << std::hex << trans.getData() << std::dec;
      }
      std::cout << " @ " << sc_core::sc_time_stamp() << std::endl;
    }
  }

  //
  // Simple AT Initiator
  // - Request must be accepted by the target before the next request can be
  //   send
  // - Responses can come out of order
  // - Responses will be accepted after fixed delay
  //
  void run()
  {
    phase_type phase;
    sc_core::sc_time t;
    
    mytransaction_type* ptrans;
    while (initTransaction(ptrans)) {
      // Create transaction and initialise phase and t
      mytransaction_type& trans = *ptrans;
      phase = tlm::BEGIN_REQ;
      t = sc_core::SC_ZERO_TIME;

      logStartTransation(trans);

      switch (socket->nb_transport_fw(trans, phase, t)) {
      case tlm::TLM_COMPLETED:
        // Transaction Finished, wait for the returned delay
        wait(t);
        logEndTransaction(trans);
        transPool.release(&trans);
        break;

      case tlm::TLM_ACCEPTED:
      case tlm::TLM_UPDATED:
        switch (phase) {
        case tlm::BEGIN_REQ:
          // Request phase not yet finished
          // Wait until end of request phase before sending new request
          
          // FIXME
          mCurrentTransaction = &trans;
          wait(mEndRequestPhase);
	  mCurrentTransaction = 0;
          break;

        case tlm::END_REQ:
          // Request phase ended
          if (t != sc_core::SC_ZERO_TIME) {
            // Wait until end of request time before sending new request
            wait(t);
          }
          break;

        case tlm::BEGIN_RESP:
          // Request phase ended and response phase already started
          if (t != sc_core::SC_ZERO_TIME) {
            // Wait until end of request time before sending new request
            wait(t);
          }
          // Notify end of response phase after ACCEPT delay
          t += ACCEPT_DELAY;
          phase = tlm::END_RESP;
          socket->nb_transport_fw(trans, phase, t);
          logEndTransaction(trans);
          transPool.release(&trans);
          break;

        case tlm::END_RESP:   // fall-through
        default:
          // A target should never return with these phases
          // If phase == END_RESP, nb_transport should have returned true
          assert(0); exit(1);
          break;
        }
        break;

      default:
        assert(0); exit(1);
      };
    }
    wait();

  }

  sync_enum_type myNBTransport(transaction_type& trans, phase_type& phase, sc_core::sc_time& t)
  {
    switch (phase) {
    case tlm::END_REQ:
      assert(t == sc_core::SC_ZERO_TIME); // FIXME: can t != 0?
      // Request phase ended
      mEndRequestPhase.notify(sc_core::SC_ZERO_TIME);
      return tlm::TLM_ACCEPTED;

    case tlm::BEGIN_RESP:
    {
      assert(t == sc_core::SC_ZERO_TIME); // FIXME: can t != 0?

      // Notify end of request phase if run thread is waiting for it
      // FIXME
      if (&trans == mCurrentTransaction) {
        mEndRequestPhase.notify(sc_core::SC_ZERO_TIME);
      }

      assert(dynamic_cast<mytransaction_type*>(&trans));
      mytransaction_type* myTrans = static_cast<mytransaction_type*>(&trans);
      assert(myTrans);

      // Notify end of response phase after ACCEPT delay
      t += ACCEPT_DELAY;
      phase = tlm::END_RESP;
      logEndTransaction(*myTrans);
      transPool.release(myTrans);

      return tlm::TLM_COMPLETED;
    }

    case tlm::BEGIN_REQ: // fall-through
    case tlm::END_RESP:  // fall-through
    default:
      // A target should never call nb_transport with these phases
      assert(0); exit(1);
//      return tlm::TLM_COMPLETED;  //unreachable code
    };
  }

private:
  const sc_core::sc_time ACCEPT_DELAY;

private:
  unsigned int mNrOfTransactions;
  unsigned int mBaseAddress;
  SimplePool transPool;
  unsigned int mTransactionCount;
  sc_core::sc_event mEndRequestPhase;
  transaction_type* mCurrentTransaction;
};

#endif