drivers/scsi/qlogicfc.h

Name: Public Git Hosting - davej-history.git/blob - drivers/scsi/qlogicfc.h
Rating: 4.8 (3322 reviews)
 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 intisp2x00_detect(Scsi_Host_Template *);
 78 intisp2x00_release(struct Scsi_Host *);
 79 const char*isp2x00_info(struct Scsi_Host *);
 80 intisp2x00_queuecommand(Scsi_Cmnd *,void(* done)(Scsi_Cmnd *));
 81 intisp2x00_abort(Scsi_Cmnd *);
 82 intisp2x00_reset(Scsi_Cmnd *,unsigned int);
 83 intisp2x00_biosparam(Disk *, kdev_t,int[]);
 84
 85 #ifndef NULL
 86 #define NULL (0)
 87 #endif
 88
 89 externstruct proc_dir_entry proc_scsi_isp2x00;
 90
 91 #define QLOGICFC { \
 92  detect: isp2x00_detect, \
 93  release: isp2x00_release, \
 94  info: isp2x00_info, \
 95  queuecommand: isp2x00_queuecommand, \
 96  eh_abort_handler: isp2x00_abort, \
 97  reset: isp2x00_reset, \
 98  bios_param: isp2x00_biosparam, \
 99  can_queue: QLOGICFC_REQ_QUEUE_LEN, \
 100  this_id: -1, \
 101  sg_tablesize: QLOGICFC_MAX_SG(QLOGICFC_REQ_QUEUE_LEN), \
 102  cmd_per_lun: QLOGICFC_CMD_PER_LUN, \
 103  present: 0, \
 104  unchecked_isa_dma: 0, \
 105  use_clustering: ENABLE_CLUSTERING \
 106 }
 107
 108 #endif/* _QLOGICFC_H */
 109
 110
 111