File: /usr/src/linux/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
110