class driver extends uvm_driver #(seq);
 `uvm_component_utils(driver)

virtual axi_driver_if vif;
sequence seq;
  
  function new(string name="driver", uvm_component parent=null);
 super.new(name, parent);
 endfunction

  virtual function void build_phase(uvm_phase phase);
    super.build_phase(phase);
    seq=sequence::type_id::create("seq");
    if(!uvm_config_db#(virtual axi_driver_if)::get(this," ","vif",vif))
      `uvm_error("driver"," Interface not set");
  endfunction
 
  task reset();
    begin
      
  		vif.awvalid     	<= 0;
  		vif.awready		<= 0;
  		vif.awid 		<= 0;
  		vif.awlen 		<= 0;
 		vif.awsize 		<= 0;
 		vif.awaddr 		<= 0;   
                vif.awburst		<= 0; 
  		vif.wvalid 		<= 0;
  		vif.wready		<= 0;
  		vif.wid 		<= 0;
  		vif.wdata 		<= 0;
 		vif.wstrb 		<= 0;
 		vif.wlast 		<= 0; 
   		vif.bready 		<= 0;
  		vif.bvalid 		<= 0;
 		vif.bid 		<= 0;
 		vif.bresp 		<= 0;        
  		vif.arvalid 	        <= 0;
  		vif.arready		<= 0;
  		vif.arid 		<= 0;
  		vif.arlen 		<= 0;
 		vif.arsize 		<= 0;
 		vif.araddr 		<= 0;   
               vif.arburst		<= 0;      
   		vif.rvalid       	<= 0;
		vif.rready		<= 0;
  		vif.rid 		<= 0;
  		vif.rdata 		<= 0;
 		vif.rstrb 		<= 0;
 		vif.rlast 		<= 0;   
               vif.rresp		<= 0;         
      @(posedge vif.clk);
      `uvm_info(get_type_name(),"reset applied",UVM_MEDIUM)      
  end
 endtask
  virtual task run_phase(uvm_phase phase);
    reset();   
   seq_tem_port.get_next_item(txn); 
    if(wr_rd==1)
          begin
          wrtie_address();
	  write_data();
	  write_response();
          end
  else
          begin
	  read_address();
	  read_data();
          end
  endtask
   virtual task write_address();
        vif.awready<=0;
        vif.awaddr<= txn.awaddr;
        vif.awsize<= txn.awsize;
        vif.awlen<= txn.awlen;
        vif.awcache<= txn.awcache;
        vif.awburst<= txn.awburst;
        vif.awvalid<=1'b1;
        case (txn.awburst)
		2'b00 : write_ad_fixed_burst;
		2'b01 : write_ad_incr_burst;
		2'b10 : write_ad_wrap_burst;
	endcase
	while(vif.awready==0)
	$display("within loop");
begin
	@(posedge vif.clk);
	if(vif.awvalid==1)
	begin 
	awready=1;
	$display("write address phase is completed");
end
end
vif.awvalid=0;
endtask

////////////////// wridte_fixed burst////////////////
 virtual task write_ad_fixed_burst();
        vif.awlen  <= txn.awlen;
        vif.awid   <= txn.awid;
	vif.awaddr <= txn.awaddr;
	vif.awsize<= txn.awsize;
	vif.awvalid<= 1;
      wait(vif.awready);
	vif.awvalid<=0;
	write_data();
endtask
 virtual task write_data();
     vif.wready<=0;
    for(int i=0;i<=txn.awlen+1;i++) begin
	    $display("write data started");
	    vif.wdata<=txn.wdata[i];
	    vif.wstrb<=txn.wstrb[i];
	    vif.wid<=txn.wid;
	    vif.wvalid<=1'b1;
	    if(i=txn.awlen+1) vif.wlast=1;
	    while (wready=0)
    begin @(posedge vif.clk)
    if (vif.wready==1)
	    txn.wready=1;
    end
    vif.wlast=0;
    vif.wvalid=0;
    vif.wready=0;
    $display("write data completed");
        end
	write_ad_incr();
    endtask

//////////////////////write_address_incremental/////////////////
virtual task write_ad_incr();
        vif.awlen  <= txn.awlen;
	for(int i=0; i<(txn.awlen +1);i++)
        vif.awid   <= txn.awid;
	vif.awaddr <= txn.awaddr;
	vif.awsize<= txn.awsize;
	txn.awaddr<= txn.awaddr+(2**awsize);
	vif.awvalid<= 1;
      wait(vif.awready);
	vif.awvalid<=0;
	write_data();
endtask
 virtual task write_data();
     vif.wready<=0;
    for(int i=0;i<=txn.awlen+1;i++) begin
	    $display("write data started");
	    vif.wdata<=txn.wdata[i];
	    vif.wstrb<=txn.wstrb[i];
	    vif.wid<=txn.wid;
	    vif.wvalid<=1'b1;
	    if(i=txn.awlen+1) vif.wlast=1;
	    while (wready=0)
    begin @(posedge vif.clk)
    if (vif.wready==1)
	    txn.wready=1;
    end
    vif.wlast=0;
    vif.wvalid=0;
    vif.wready=0;
    $display("write data completed");
    write_ad_wrap();
    end
    endtask

    ///////////wri_address_wrap///////////////////////
    virtual task write_ad_wrap();
    vif.awlen  <= '{1,3,7,15};
        vif.awid   <= txn.awid;
	vif.awaddr <= txn.awaddr;
	vif.awsize<= txn.awsize;

     begin
	     int burst_length=(awlen+1);
	     int burst_size=(awsize+1);
	     int lower_boundary=INT[awaddr/(burst_length*burst_size)]*(burst_length*burst_size);
	     int upper_boundary=lower_boundar+(burst_length*burst_size);
	      for (int i=0; i< (pkt.awlen+1);i++)
             begin	     
              if(vif.awaddr==upper_boundary)
		      vif.awaddr=lower_boundary;
	      else
      vif.awaddr <= vif.awaddr+ (2**vif.awsize);
	vif.awvalid<= 1;
      wait(vif.awready);
	vif.awvalid<=0;
end
      write_data();
      endtask

      virtual task write_data();
                    vif.wready<=0;
    for(int i=0;i<=txn.awlen+1;i++) begin
	    $display("write data started");
	    vif.wdata<=txn.wdata[i];
	    vif.wstrb<=txn.wstrb[i];
	    vif.wid<=txn.wid;
	    vif.wvalid<=1'b1;
	    if(i=txn.awlen+1) vif.wlast=1;
	    while (wready=0)
    begin @(posedge vif.clk)
    if (vif.wready==1)
	    txn.wready=1;
    end
    vif.wlast=0;
    vif.wvalid=0;
    vif.wready=0;
    $display("write data completed");
    write_response();
    end
    endtask
  virtual task write_response();
  if(vif.wvalid&&vif.wready&&vif.wlast)
      wait(bvalid)
     begin	
	vif.bid = pkt.bid;
	vif.bresp = pkt.bresp;
      end	
	vif.bready <= 1	 ;
     for(i=0;i<=awlen+1;i++)
         begin 	     
	  if(vif.awid==vif.bid)
               case(vif.bresp)
		       2'b00:"okay";
		       2'b01:"exclusive okay";
		       2'b10:"slave error";
		       2'b11:"decode error";
	       endcase
       end
	       vif.bready<=0;
       endtask


  ///////////////////////Read address////////////////////////////////////////////////


       task read_adress();

	`uvm_info("master_driver",$sformatf("message from driver\n %s",pkt.sprint()),UVM_HIGH)

	vif.arid <= pkt.arid;
	vif.araddr <= pkt.araddr;
	vif.arlen <= pkt.arlen;
	vif.arsize <= pkt.arsize;
	vif.arburst <= pkt.arburst;
	vif.arvalid <= 1;
	`uvm_info("master_driver",$sformatf("message from driver \n %s",pkt.sprint()),UVM_HIGH)
	
	case (txn.arburst)

		2'b00 : read_address_fixed_burst;
		2'b01 : read_address_incr_burst;
		2'b10 : read_address_wrap_burst;

	endcase

	@(posedge vif.clk);
		
	wait (vif.arready);

	vif.arvalid <= 0;
	
endtask
//////////////////////////////////////// raed wrap burst////////////////////
 virtual task read_ad_wrap();
    vif.awlen  <= '{1,3,7,15};
        vif.arid   <= txn.arid;
	vif.araddr <= txn.araddr;
	vif.arsize<= txn.arsize;

     begin
	     int burst_length=(arlen+1);
	     int burst_size=(arsize+1);
	     int lower_boundary=INT[araddr/(burst_length*burst_size)]*(burst_length*burst_size);
	     int upper_boundary=lower_boundar+(burst_length*burst_size);
	      for (int i=0; i< (pkt.arlen+1);i++)
             begin	     
              if(vif.araddr==upper_boundary)
		      vif.araddr=lower_boundary;
	      else
      vif.araddr <= vif.araddr+ (2**vif.arsize);
	vif.arvalid<= 1;
      wait(vif.arready);
	vif.arvalid<=0;
end
      read_data1();
      endtask

  virtual task read_data1();
                    vif.rready<=0;
    for(int i=0;i<=txn.arlen+1;i++) begin
	    $display("read data started");
	    vif.rdata<=txn.rdata[i];
	    vif.rid<=txn.rid;
	    vif.rvalid<=1'b1;
	    if(i=txn.arlen+1) vif.rlast=1;
	    while (rready=0)
    begin @(posedge vif.clk)
    if (vif.rready==1)
	    txn.rready=1;
    end
    vif.rlast=0;
    vif.rvalid=0;
      $display("read data completed");
    end
	foreach (vif.rdata[i])
	begin	
		if (vif.arid == vif.rid)
		begin
			case (vif.rresp)

				2'b00 : s = "Transaction OKAY";
				2'b01 : s = "Transaction FAILED";
				2'b10 : s = "SLAVE ERROR";
				2'b11 : s = "DEEOCDE ERROR";
			
			endcase
				
		`uvm_info("axi master_driver",$sformatf("\n t %s response for the received data \n",s),UVM_MEDIUM)
	
		end
	end
	
	vif.rready <= 0;

endtask




////////////////////////////////////////  INCR address    ////////////////
task read_address_incr_burst();
	vif.arlen <=txn.arlen;
	for(int i=0; i<(arlen +1);i++)
	begin
		vif.araddr<=txn.araddr;
        	vif.arid   <= txn.arid;
		vif.arvalid<= 1;
		pkt.araddr<= txn.araddr +(2**vif.arsize);
		wait(vif.arready);
		vif.arvalid<=0;

	end
read_data();
endtask

 virtual task read_data();
                    vif.rready<=0;
    for(int i=0;i<=txn.arlen+1;i++) begin
	    $display("read data started");
	    vif.rdata<=txn.rdata[i];
	    vif.rid<=txn.rid;
	    vif.rvalid<=1'b1;
	    if(i=txn.arlen+1) vif.rlast=1;
	    while (rready=0)
    begin @(posedge vif.clk)
    if (vif.rready==1)
	    txn.rready=1;
    end
    vif.rlast=0;
    vif.rvalid=0;
      $display("read data completed");
end	
	vif.rready <= 1;
	
	foreach (vif.rdata[i])
	begin	
		if (vif.arid == vif.rid)
		begin
			case (vif.rresp)

				2'b00 : s = "Transaction OKAY";
				2'b01 : s = "Transaction FAILED";
				2'b10 : s = "SLAVE ERROR";
				2'b11 : s = "DEEOCDE ERROR";
			
			endcase
				
		`uvm_info("master_driver",$sformatf("\n\t %s response for the recieved data \n",s),UVM_MEDIUM)
	
		end
	end
	
	vif.rready <= 0;
	
endtask
///////////////read address fixed burst////////////////////////
task read_address_fixed_burst ();
begin
	vif.arlen  <= txn.arlen;
        vif.arid   <= txn.arid;
	vif.araddr <= txn.araddr;
	vif.arvalid<= 1;
wait(vif.arready);
	vif.arvalid<=0;
	end 
	rd_dt_fixed_burst();

endtask



task rd_dt_fixed_burst ();
	    vif.rready<=0;
    for(int i=0;i<=txn.arlen+1;i++) begin
	    $display("read data started");
	    vif.rdata<=txn.rdata[i];
	    vif.rid<=txn.rid;
	    vif.rvalid<=1'b1;
	    if(i=txn.arlen+1) vif.rlast=1;
	    while (rready=0)
    begin @(posedge vif.clk)
    if (vif.rready==1)
	    txn.rready=1;
    end
    vif.rlast=0;
    vif.rvalid=0;
      $display("read data completed");
end	
	foreach (vif.rdata[i])
	begin	
		if (vif.arid == vif.rid)
		begin
			case (vif.rresp)

				2'b00 : s = "Transaction OKAY";
				2'b01 : s = "Transaction FAILED";
				2'b10 : s = "SLAVE ERROR";
				2'b11 : s = "DEEOCDE ERROR";
			
			endcase
				
		`uvm_info("master_driver",$sformatf("\n\t %s response for recieved data \n",s),UVM_MEDIUM)
	
		end
	end
	
	vif.rready <= 0;

endtask
      
      if(txn.resest==1) begin
       reset();
     end     
      //Write operation support
      else if(txn.wr_rd==1) begin  
        `uvm_info(get_type_name()," write packet is received in driver ",UVM_MEDIUM) 
begin
	write_address();
end
          
    //read operation support
      else if( txn.wr_rd==0) 
      begin    
	read_address();
      end   
 	seq_item_port.item_done();
 end
 endtask
endclass