/* ES40 emulator.
 * Copyright (C) 2007-2008 by the ES40 Emulator Project
 *
 * WWW    : http://sourceforge.net/projects/es40
 * E-mail : camiel@camicom.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Although this is not required, the author would appreciate being notified of,
 * and receiving any modifications you may make to the source code that might serve
 * the general public.
 */

 /**
  * \file
  * Contains definitions for the SCSI bus class.
  *
  * $Id$
  *
  * X-1.2        Camiel Vanderhoeven                             20-JAN-2008
  *      Avoid compiler warnings.
  *
  * X-1.1        Camiel Vanderhoeven                             12-JAN-2008
  *      Initial version in CVS.
  **/
#if !defined(__SCSIBUS__H__)
#define __SCSIBUS__H__

#include "SystemComponent.h"
#include "SCSIDevice.h"

  /**
   * \brief Emulated SCSI bus.
   *
   * connects SCSI Devices (class CSCSIDevice) together; SCSI devices are
   * disks and controllers.
   **/
class CSCSIBus : public CSystemComponent
{
public:
  CSCSIBus(CConfigurator* cfg, CSystem* c);
  ~CSCSIBus(void);
  virtual int   SaveState(FILE* f);
  virtual int   RestoreState(FILE* f);

  void          scsi_register(CSCSIDevice* dev, int bus, int target);
  void          scsi_unregister(CSCSIDevice* dev, int target);

  bool          arbitrate(int initiator);
  bool          select(int initiator, int target);
  void          set_phase(int target, int phase);
  int           get_phase() { return state.phase; };

  /**< Get current SCSI bus phase **/
  void          free_bus(int initiator);

  CSCSIDevice* targets[16];        /**< pointers to the SCSI devices that respond to the 15 possible target id's. **/
  int           target_bus_no[16];  /**< indicates what bus this is for each connected SCSI device. always 0 for disks,
                                but controllers could have multiple SCSI busses. **/

                                /// The state structure contains all elements that need to be saved to the statefile
  struct SSCSI_state
  {
    int initiator;  /**< SCSI id of the initiator. **/
    int target;     /**< SCSI id of the target. **/
    int phase;      /**< SCSI bus phase. **/
  } state;
};

#define SCSI_PHASE_FREE         - 2
#define SCSI_PHASE_ARBITRATION  - 1
#define SCSI_PHASE_DATA_OUT     0
#define SCSI_PHASE_DATA_IN      1
#define SCSI_PHASE_COMMAND      2
#define SCSI_PHASE_STATUS       3
#define SCSI_PHASE_MSG_OUT      6
#define SCSI_PHASE_MSG_IN       7
#endif