drivers/scsi/qlogicisp.h

   1 /*
   2  * QLogic ISP1020 Intelligent SCSI Processor Driver (PCI)
   3  * Written by Erik H. Moe, ehm@cris.com
   4  * Copyright 1995, Erik H. Moe
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  */
  16
  17 /* Renamed and updated to 1.3.x by Michael Griffith <grif@cs.ucr.edu> */
  18
  19 /*
  20  * $Date: 1995/09/22 02:32:56 $
  21  * $Revision: 0.5 $
  22  *
  23  * $Log: isp1020.h,v $
  24  * Revision 0.5  1995/09/22  02:32:56  root
  25  * do auto request sense
  26  *
  27  * Revision 0.4  1995/08/07  04:48:28  root
  28  * supply firmware with driver.
  29  * numerous bug fixes/general cleanup of code.
  30  *
  31  * Revision 0.3  1995/07/16  16:17:16  root
  32  * added reset/abort code.
  33  *
  34  * Revision 0.2  1995/06/29  03:19:43  root
  35  * fixed biosparam.
  36  * added queue protocol.
  37  *
  38  * Revision 0.1  1995/06/25  01:56:13  root
  39  * Initial release.
  40  *
  41  */
  42
  43 #ifndef _QLOGICISP_H
  44 #define _QLOGICISP_H
  45
  46 /*
  47  * With the qlogic interface, every queue slot can hold a SCSI
  48  * command with up to 4 scatter/gather entries.  If we need more
  49  * than 4 entries, continuation entries can be used that hold
  50  * another 7 entries each.  Unlike for other drivers, this means
  51  * that the maximum number of scatter/gather entries we can
  52  * support at any given time is a function of the number of queue
  53  * slots available.  That is, host->can_queue and host->sg_tablesize
  54  * are dynamic and _not_ independent.  This all works fine because
  55  * requests are queued serially and the scatter/gather limit is
  56  * determined for each queue request anew.
  57  */
  58 #define QLOGICISP_REQ_QUEUE_LEN 63      /* must be power of two - 1 */
  59 #define QLOGICISP_MAX_SG(ql)    (4 + ((ql) > 0) ? 7*((ql) - 1) : 0)
  60
  61 int isp1020_detect(Scsi_Host_Template *);
  62 int isp1020_release(struct Scsi_Host *);
  63 const char * isp1020_info(struct Scsi_Host *);
  64 int isp1020_queuecommand(Scsi_Cmnd *, void (* done)(Scsi_Cmnd *));
  65 int isp1020_abort(Scsi_Cmnd *);
  66 int isp1020_reset(Scsi_Cmnd *, unsigned int);
  67 int isp1020_biosparam(struct scsi_device *, struct block_device *,
  68                 sector_t, int[]);
  69 #endif /* _QLOGICISP_H */