src/systemc/tests/systemc/misc/stars/star111004/star111004.cpp

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  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
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  with this work for additional information regarding copyright ownership.
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  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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/*****************************************************************************

  star111004.cpp -- 

  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15

 *****************************************************************************/

/*****************************************************************************

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

      Name, Affiliation, Date:
  Description of Modification:

 *****************************************************************************/

/*############################################################################
#  Siemens AG                        copyright 2000
#                                    All Rights Reserved
#
#  File name : io_controller.cpp
# 
#  Title     : I/O-Controller
#  
#  Purpose   : functionality for I/O-Controller-module 
#
#  Author    : Hannes Muhr
#              PSE EZE MSA
#
##############################################################################
#  Modification History :
#
#   
##############################################################################*/

#include "systemc.h"
#include "io_controller.h"

#define MII_FRAME_SIZE 400

// ::semaphore(){
   
//    value = false;
// }

void io_controller_m::P(){

   while (value) wait();
   value = true;
}
         
void io_controller_m::V(){

   /*if (!value) {
      cerr << "V-operation on semaphore that is not P'd\n";
      exit(-1);
   }*/
   value = false;
}

bool io_controller_m::get_value(){
   
   return value;
}

/*void sc_trace(sc_trace_file *tf, const semaphore& sem, const std::string& str){
   
   sc_trace(tf, sem.get_value(), str);
}*/
         
sc_uint<32> io_controller_m::read_from_memory(sc_uint<32> mp){

   // read from mbdatm-memory over i486-IF
   
   addr30_o = mp >> 2;
   ads_n_o = 0;
   wr_n_o = 0;
   wait();
   ads_n_o = 1;
   do { wait(); } while (rdy_n_i == 1);
   sc_uint<32> data = data32_i.read();
   wr_n_o = 1;
   addr30_o = 0;
   return data;      
}

void io_controller_m::write_into_memory(sc_uint<32> mp, sc_uint<32> data){

   addr30_o = mp >> 2;
   ads_n_o = 0;
   wr_n_o = 1;
   wait();
   ads_n_o = 1;
   data32_o = data;
   do { wait(); } while (rdy_n_i == 1);
   wr_n_o = 1;
   addr30_o = 0;
   data32_o = 0;
}

void io_controller_m::control_write(){
   sc_uint<32> word_cnt;
   
   if (!res_n_i.read()){
      do { wait(); } while (!res_n_i);
   
      // initialize
      
      // wait for 1. AR (HWS-Daten)
      do { wait(); } while (!ar_i);
      sc_uint<32> hws = data32_i.read();
      
      wait();

      // wait for 2. AR (ACB-Pointer)
      do { wait(); } while (!ar_i);
      addr_tx_frame_ptr = data32_i.read();
      
   } 
  /* else if (mii_coll_det){
      out_fifo_reset = 1;
      out_fifo_en = 0;
      out_fifo_data32 = (sc_uint<32>) 0;
      
      // reset i486-IF
      addr30_o = 0;
      data32_io = 0;
      ads_n_o = 1;
      wr_n_o = 1; 
   
      // release Semaphore if it is set
      sem.V();
      
      wait();
      out_fifo_reset = 0;
   }*/
   
   while(true){
      // normally Attention Request - Signal from MBDATM
      // would wake up IO-Controller to read data from the memory,
      // but the model from Hr. Wahl said: wait for some ms !!!
      
     // wait(unsigned ((SCAN_INTERVAL NS)/40e-9));
      //do { wait(); } while (ar_i);
      
      #ifdef LOGGING
         flog << sc_time_stamp()<<": "<<name()<<"::control_write - Attention Request" << endl;
      #endif
   
      P();
      sc_uint<32> tx_frame_ptr = read_from_memory(addr_tx_frame_ptr);
      if (tx_frame_ptr != 0)
         word_cnt = read_from_memory(tx_frame_ptr+(MII_FIFO_SIZE+1)*4);
      V();
      
      // check, if frame available and frame is full (word_cnt == MII_FRAME_SIZE)
      
      while (tx_frame_ptr != 0 && word_cnt == MII_FRAME_SIZE){
         #ifdef LOGGING
            flog << sc_time_stamp()<<": "<<name()<<"::control_write - writing mii_frame into out_fifo" << endl;
         #endif
         
         
         for (int i = 0; i<MII_FIFO_SIZE; i++){
            // reading from i486-IF and writing into
            // out_fifo is mixed, so read_from_memory could not be applied
            
            P();
            sc_uint<32> data = read_from_memory(tx_frame_ptr+i*4);
            V();
            
            out_fifo_en = 1;
            out_fifo_data32 = data;
            wait();
            out_fifo_en = 0;
            
         }
         
         while (out_fifo_act.read() != 0) wait(2);
         
         // write 0xFFFFFFFF (>MII_FRAME_SIZE) into tx_frame_ptr 
         // to signal software in mbdatm that io-controller has 
         // read out the frames and sent successfully
         P();
         write_into_memory(tx_frame_ptr+(MII_FIFO_SIZE+1)*4, 0xFFFFFFFF);
         V();
         
         // read next frame_pointer and word_cnt from MBDATM
         P();
         tx_frame_ptr = read_from_memory(tx_frame_ptr+MII_FIFO_SIZE*4);
         if (tx_frame_ptr != 0)
            word_cnt = read_from_memory(tx_frame_ptr+(MII_FIFO_SIZE+1)*4);
         V();
         
         
      }
      
   }
}

void io_controller_m::control_read(){

  int arr_ptr = 0;
   
   while (true){
      do { wait(); } while (!control_en);
      #ifdef LOGGING
         flog << sc_time_stamp()<<": "<<name()<<"::control_read " << endl;
      #endif
      
      // read rx_frame_ptr from MBDATM
      P();
      sc_uint<32> rx_frame_ptr = read_from_memory(rx_ptr_array+arr_ptr*4);
      V();
      /*if (rx_frame_ptr == 0){
         cerr << "\nIO-Controller has read NULL-ptr from rx_array in MBDATM\n";
         cerr << "MBDATM did not fill rx_array fast enough\n";
         exit(-1);
      }*/
      if (++arr_ptr == MII_FIFO_SIZE)
         arr_ptr = 0;
      
      // write data from in_fifo into MBDATM-memory
      for (int i = 0; i < MII_FIFO_SIZE-1; i++){
         sc_uint<32> d = control_data32.read();
         // grab the semaphore
         P();
         write_into_memory(rx_frame_ptr + i*4, d);
         // release semaphore
         V();
         do { wait(); } while (!control_en);
         
      }
      // separate last loop because we don't want to wait for
      // another control_en at this time
      sc_uint<32> d = control_data32.read();
      P();
      write_into_memory(rx_frame_ptr + (MII_FIFO_SIZE-1)*4, d);
      V();
      
      // write 0xFFFFFFFF into word_cnt from frame
      // to indicate the software (MBDATM) that frame has been filled
      P();
      write_into_memory(rx_frame_ptr + (MII_FIFO_SIZE+1)*4, 0xFFFFFFFF);
      V();
   }
}