drivers/scsi/qlogicfc.h

   1 /*
   2  * QLogic ISP2x00 SCSI-FCP
   3  *
   4  * Written by Erik H. Moe, ehm@cris.com
   5  * Copyright 1995, Erik H. Moe
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 /* Renamed and updated to 1.3.x by Michael Griffith <grif@cs.ucr.edu> */
  19
  20 /* This is a version of the isp1020 driver which was modified by
  21  * Chris Loveland <cwl@iol.unh.edu> to support the isp2x00
  22  */
  23
  24
  25 /*
  26  * $Date: 1995/09/22 02:32:56 $
  27  * $Revision: 0.5 $
  28  *
  29  * $Log: isp1020.h,v $
  30  * Revision 0.5  1995/09/22  02:32:56  root
  31  * do auto request sense
  32  *
  33  * Revision 0.4  1995/08/07  04:48:28  root
  34  * supply firmware with driver.
  35  * numerous bug fixes/general cleanup of code.
  36  *
  37  * Revision 0.3  1995/07/16  16:17:16  root
  38  * added reset/abort code.
  39  *
  40  * Revision 0.2  1995/06/29  03:19:43  root
  41  * fixed biosparam.
  42  * added queue protocol.
  43  *
  44  * Revision 0.1  1995/06/25  01:56:13  root
  45  * Initial release.
  46  *
  47  */
  48
  49 #ifndef _QLOGICFC_H
  50 #define _QLOGICFC_H
  51
  52 /*
  53  * With the qlogic interface, every queue slot can hold a SCSI
  54  * command with up to 2 scatter/gather entries.  If we need more
  55  * than 2 entries, continuation entries can be used that hold
  56  * another 5 entries each.  Unlike for other drivers, this means
  57  * that the maximum number of scatter/gather entries we can
  58  * support at any given time is a function of the number of queue
  59  * slots available.  That is, host->can_queue and host->sg_tablesize
  60  * are dynamic and _not_ independent.  This all works fine because
  61  * requests are queued serially and the scatter/gather limit is
  62  * determined for each queue request anew.
  63  */
  64
  65 #if BITS_PER_LONG > 32
  66 #define DATASEGS_PER_COMMAND 2
  67 #define DATASEGS_PER_CONT 5
  68 #else
  69 #define DATASEGS_PER_COMMAND 3
  70 #define DATASEGS_PER_CONT 7
  71 #endif
  72
  73 #define QLOGICFC_REQ_QUEUE_LEN  127     /* must be power of two - 1 */
  74 #define QLOGICFC_MAX_SG(ql)     (DATASEGS_PER_COMMAND + (((ql) > 0) ? DATASEGS_PER_CONT*((ql) - 1) : 0))
  75 #define QLOGICFC_CMD_PER_LUN    8
  76
  77 int isp2x00_detect(Scsi_Host_Template *);
  78 int isp2x00_release(struct Scsi_Host *);
  79 const char * isp2x00_info(struct Scsi_Host *);
  80 int isp2x00_queuecommand(Scsi_Cmnd *, void (* done)(Scsi_Cmnd *));
  81 int isp2x00_abort(Scsi_Cmnd *);
  82 int isp2x00_reset(Scsi_Cmnd *, unsigned int);
  83 int isp2x00_biosparam(Disk *, kdev_t, int[]);
  84
  85 #ifndef NULL
  86 #define NULL (0)
  87 #endif
  88
  89 #define QLOGICFC {                                                         \
  90         detect:                 isp2x00_detect,                            \
  91         release:                isp2x00_release,                           \
  92         info:                   isp2x00_info,                              \
  93         queuecommand:           isp2x00_queuecommand,                      \
  94         eh_abort_handler:       isp2x00_abort,                             \
  95         reset:                  isp2x00_reset,                             \
  96         bios_param:             isp2x00_biosparam,                         \
  97         can_queue:              QLOGICFC_REQ_QUEUE_LEN,                    \
  98         this_id:                -1,                                        \
  99         sg_tablesize:           QLOGICFC_MAX_SG(QLOGICFC_REQ_QUEUE_LEN),   \
 100         cmd_per_lun:            QLOGICFC_CMD_PER_LUN,                      \
 101         present:                0,                                         \
 102         unchecked_isa_dma:      0,                                         \
 103         use_clustering:         ENABLE_CLUSTERING                          \
 104 }
 105
 106 #endif /* _QLOGICFC_H */
 107
 108
 109