1 /*
2 * Parallel SCSI (SPI) transport specific attributes exported to sysfs.
3 *
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20 #ifndef SCSI_TRANSPORT_SPI_H
21 #define SCSI_TRANSPORT_SPI_H
22
23 #include <linux/transport_class.h>
24 #include <linux/mutex.h>
25
26 struct scsi_transport_template;
27 struct scsi_target;
28 struct scsi_device;
29 struct Scsi_Host;
30
31 struct spi_transport_attrs {
32 int period; /* value in the PPR/SDTR command */
33 int min_period;
34 int offset;
35 int max_offset;
36 unsigned int width:1; /* 0 - narrow, 1 - wide */
37 unsigned int max_width:1;
38 unsigned int iu:1; /* Information Units enabled */
39 unsigned int dt:1; /* DT clocking enabled */
40 unsigned int qas:1; /* Quick Arbitration and Selection enabled */
41 unsigned int wr_flow:1; /* Write Flow control enabled */
42 unsigned int rd_strm:1; /* Read streaming enabled */
43 unsigned int rti:1; /* Retain Training Information */
44 unsigned int pcomp_en:1;/* Precompensation enabled */
45 unsigned int hold_mcs:1;/* Hold Margin Control Settings */
46 unsigned int initial_dv:1; /* DV done to this target yet */
47 unsigned long flags; /* flags field for drivers to use */
48 /* Device Properties fields */
49 unsigned int support_sync:1; /* synchronous support */
50 unsigned int support_wide:1; /* wide support */
51 unsigned int support_dt:1; /* allows DT phases */
52 unsigned int support_dt_only; /* disallows ST phases */
53 unsigned int support_ius; /* support Information Units */
54 unsigned int support_qas; /* supports quick arbitration and selection */
55 /* Private Fields */
56 unsigned int dv_pending:1; /* Internal flag: DV Requested */
57 unsigned int dv_in_progress:1; /* Internal: DV started */
58 struct mutex dv_mutex; /* semaphore to serialise dv */
59 };
60
61 enum spi_signal_type {
62 SPI_SIGNAL_UNKNOWN = 1,
63 SPI_SIGNAL_SE,
64 SPI_SIGNAL_LVD,
65 SPI_SIGNAL_HVD,
66 };
67
68 struct spi_host_attrs {
69 enum spi_signal_type signalling;
70 };
71
72 /* accessor functions */
73 #define spi_period(x) (((struct spi_transport_attrs *)&(x)->starget_data)->period)
74 #define spi_min_period(x) (((struct spi_transport_attrs *)&(x)->starget_data)->min_period)
75 #define spi_offset(x) (((struct spi_transport_attrs *)&(x)->starget_data)->offset)
76 #define spi_max_offset(x) (((struct spi_transport_attrs *)&(x)->starget_data)->max_offset)
77 #define spi_width(x) (((struct spi_transport_attrs *)&(x)->starget_data)->width)
78 #define spi_max_width(x) (((struct spi_transport_attrs *)&(x)->starget_data)->max_width)
79 #define spi_iu(x) (((struct spi_transport_attrs *)&(x)->starget_data)->iu)
80 #define spi_dt(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dt)
81 #define spi_qas(x) (((struct spi_transport_attrs *)&(x)->starget_data)->qas)
82 #define spi_wr_flow(x) (((struct spi_transport_attrs *)&(x)->starget_data)->wr_flow)
83 #define spi_rd_strm(x) (((struct spi_transport_attrs *)&(x)->starget_data)->rd_strm)
84 #define spi_rti(x) (((struct spi_transport_attrs *)&(x)->starget_data)->rti)
85 #define spi_pcomp_en(x) (((struct spi_transport_attrs *)&(x)->starget_data)->pcomp_en)
86 #define spi_hold_mcs(x) (((struct spi_transport_attrs *)&(x)->starget_data)->hold_mcs)
87 #define spi_initial_dv(x) (((struct spi_transport_attrs *)&(x)->starget_data)->initial_dv)
88 #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
89
90 #define spi_support_sync(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_sync)
91 #define spi_support_wide(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_wide)
92 #define spi_support_dt(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_dt)
93 #define spi_support_dt_only(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_dt_only)
94 #define spi_support_ius(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_ius)
95 #define spi_support_qas(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_qas)
96
97 #define spi_flags(x) (((struct spi_transport_attrs *)&(x)->starget_data)->flags)
98 #define spi_signalling(h) (((struct spi_host_attrs *)(h)->shost_data)->signalling)
99
100
101
102 /* The functions by which the transport class and the driver communicate */
103 struct spi_function_template {
104 void (*get_period)(struct scsi_target *);
105 void (*set_period)(struct scsi_target *, int);
106 void (*get_offset)(struct scsi_target *);
107 void (*set_offset)(struct scsi_target *, int);
108 void (*get_width)(struct scsi_target *);
109 void (*set_width)(struct scsi_target *, int);
110 void (*get_iu)(struct scsi_target *);
111 void (*set_iu)(struct scsi_target *, int);
112 void (*get_dt)(struct scsi_target *);
113 void (*set_dt)(struct scsi_target *, int);
114 void (*get_qas)(struct scsi_target *);
115 void (*set_qas)(struct scsi_target *, int);
116 void (*get_wr_flow)(struct scsi_target *);
117 void (*set_wr_flow)(struct scsi_target *, int);
118 void (*get_rd_strm)(struct scsi_target *);
119 void (*set_rd_strm)(struct scsi_target *, int);
120 void (*get_rti)(struct scsi_target *);
121 void (*set_rti)(struct scsi_target *, int);
122 void (*get_pcomp_en)(struct scsi_target *);
123 void (*set_pcomp_en)(struct scsi_target *, int);
124 void (*get_hold_mcs)(struct scsi_target *);
125 void (*set_hold_mcs)(struct scsi_target *, int);
126 void (*get_signalling)(struct Scsi_Host *);
127 void (*set_signalling)(struct Scsi_Host *, enum spi_signal_type);
128 int (*deny_binding)(struct scsi_target *);
129 /* The driver sets these to tell the transport class it
130 * wants the attributes displayed in sysfs. If the show_ flag
131 * is not set, the attribute will be private to the transport
132 * class */
133 unsigned long show_period:1;
134 unsigned long show_offset:1;
135 unsigned long show_width:1;
136 unsigned long show_iu:1;
137 unsigned long show_dt:1;
138 unsigned long show_qas:1;
139 unsigned long show_wr_flow:1;
140 unsigned long show_rd_strm:1;
141 unsigned long show_rti:1;
142 unsigned long show_pcomp_en:1;
143 unsigned long show_hold_mcs:1;
144 };
145
146 struct scsi_transport_template *spi_attach_transport(struct spi_function_template *);
147 void spi_release_transport(struct scsi_transport_template *);
148 void spi_schedule_dv_device(struct scsi_device *);
149 void spi_dv_device(struct scsi_device *);
150 void spi_display_xfer_agreement(struct scsi_target *);
151 int spi_print_msg(const unsigned char *);
152 int spi_populate_width_msg(unsigned char *msg, int width);
153 int spi_populate_sync_msg(unsigned char *msg, int period, int offset);
154 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset, int width,
155 int options);
156
157 #endif /* SCSI_TRANSPORT_SPI_H */
158
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