1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Parallel SCSI (SPI) transport specific attributes exported to sysfs.
4 *
5 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
6 */
7 #ifndef SCSI_TRANSPORT_SPI_H
8 #define SCSI_TRANSPORT_SPI_H
9
10 #include <linux/transport_class.h>
11 #include <linux/mutex.h>
12
13 struct scsi_transport_template;
14 struct scsi_target;
15 struct scsi_device;
16 struct Scsi_Host;
17
18 struct spi_transport_attrs {
19 int period; /* value in the PPR/SDTR command */
20 int min_period;
21 int offset;
22 int max_offset;
23 unsigned int width:1; /* 0 - narrow, 1 - wide */
24 unsigned int max_width:1;
25 unsigned int iu:1; /* Information Units enabled */
26 unsigned int max_iu:1;
27 unsigned int dt:1; /* DT clocking enabled */
28 unsigned int qas:1; /* Quick Arbitration and Selection enabled */
29 unsigned int max_qas:1;
30 unsigned int wr_flow:1; /* Write Flow control enabled */
31 unsigned int rd_strm:1; /* Read streaming enabled */
32 unsigned int rti:1; /* Retain Training Information */
33 unsigned int pcomp_en:1;/* Precompensation enabled */
34 unsigned int hold_mcs:1;/* Hold Margin Control Settings */
35 unsigned int initial_dv:1; /* DV done to this target yet */
36 unsigned long flags; /* flags field for drivers to use */
37 /* Device Properties fields */
38 unsigned int support_sync:1; /* synchronous support */
39 unsigned int support_wide:1; /* wide support */
40 unsigned int support_dt:1; /* allows DT phases */
41 unsigned int support_dt_only; /* disallows ST phases */
42 unsigned int support_ius; /* support Information Units */
43 unsigned int support_qas; /* supports quick arbitration and selection */
44 /* Private Fields */
45 unsigned int dv_pending:1; /* Internal flag: DV Requested */
46 unsigned int dv_in_progress:1; /* Internal: DV started */
47 struct mutex dv_mutex; /* semaphore to serialise dv */
48 };
49
50 enum spi_signal_type {
51 SPI_SIGNAL_UNKNOWN = 1,
52 SPI_SIGNAL_SE,
53 SPI_SIGNAL_LVD,
54 SPI_SIGNAL_HVD,
55 };
56
57 struct spi_host_attrs {
58 enum spi_signal_type signalling;
59 };
60
61 /* accessor functions */
62 #define spi_period(x) (((struct spi_transport_attrs *)&(x)->starget_data)->period)
63 #define spi_min_period(x) (((struct spi_transport_attrs *)&(x)->starget_data)->min_period)
64 #define spi_offset(x) (((struct spi_transport_attrs *)&(x)->starget_data)->offset)
65 #define spi_max_offset(x) (((struct spi_transport_attrs *)&(x)->starget_data)->max_offset)
66 #define spi_width(x) (((struct spi_transport_attrs *)&(x)->starget_data)->width)
67 #define spi_max_width(x) (((struct spi_transport_attrs *)&(x)->starget_data)->max_width)
68 #define spi_iu(x) (((struct spi_transport_attrs *)&(x)->starget_data)->iu)
69 #define spi_max_iu(x) (((struct spi_transport_attrs *)&(x)->starget_data)->max_iu)
70 #define spi_dt(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dt)
71 #define spi_qas(x) (((struct spi_transport_attrs *)&(x)->starget_data)->qas)
72 #define spi_max_qas(x) (((struct spi_transport_attrs *)&(x)->starget_data)->max_qas)
73 #define spi_wr_flow(x) (((struct spi_transport_attrs *)&(x)->starget_data)->wr_flow)
74 #define spi_rd_strm(x) (((struct spi_transport_attrs *)&(x)->starget_data)->rd_strm)
75 #define spi_rti(x) (((struct spi_transport_attrs *)&(x)->starget_data)->rti)
76 #define spi_pcomp_en(x) (((struct spi_transport_attrs *)&(x)->starget_data)->pcomp_en)
77 #define spi_hold_mcs(x) (((struct spi_transport_attrs *)&(x)->starget_data)->hold_mcs)
78 #define spi_initial_dv(x) (((struct spi_transport_attrs *)&(x)->starget_data)->initial_dv)
79 #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
80
81 #define spi_support_sync(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_sync)
82 #define spi_support_wide(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_wide)
83 #define spi_support_dt(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_dt)
84 #define spi_support_dt_only(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_dt_only)
85 #define spi_support_ius(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_ius)
86 #define spi_support_qas(x) (((struct spi_transport_attrs *)&(x)->starget_data)->support_qas)
87
88 #define spi_flags(x) (((struct spi_transport_attrs *)&(x)->starget_data)->flags)
89 #define spi_signalling(h) (((struct spi_host_attrs *)(h)->shost_data)->signalling)
90
91
92
93 /* The functions by which the transport class and the driver communicate */
94 struct spi_function_template {
95 void (*get_period)(struct scsi_target *);
96 void (*set_period)(struct scsi_target *, int);
97 void (*get_offset)(struct scsi_target *);
98 void (*set_offset)(struct scsi_target *, int);
99 void (*get_width)(struct scsi_target *);
100 void (*set_width)(struct scsi_target *, int);
101 void (*get_iu)(struct scsi_target *);
102 void (*set_iu)(struct scsi_target *, int);
103 void (*get_dt)(struct scsi_target *);
104 void (*set_dt)(struct scsi_target *, int);
105 void (*get_qas)(struct scsi_target *);
106 void (*set_qas)(struct scsi_target *, int);
107 void (*get_wr_flow)(struct scsi_target *);
108 void (*set_wr_flow)(struct scsi_target *, int);
109 void (*get_rd_strm)(struct scsi_target *);
110 void (*set_rd_strm)(struct scsi_target *, int);
111 void (*get_rti)(struct scsi_target *);
112 void (*set_rti)(struct scsi_target *, int);
113 void (*get_pcomp_en)(struct scsi_target *);
114 void (*set_pcomp_en)(struct scsi_target *, int);
115 void (*get_hold_mcs)(struct scsi_target *);
116 void (*set_hold_mcs)(struct scsi_target *, int);
117 void (*get_signalling)(struct Scsi_Host *);
118 void (*set_signalling)(struct Scsi_Host *, enum spi_signal_type);
119 int (*deny_binding)(struct scsi_target *);
120 /* The driver sets these to tell the transport class it
121 * wants the attributes displayed in sysfs. If the show_ flag
122 * is not set, the attribute will be private to the transport
123 * class */
124 unsigned long show_period:1;
125 unsigned long show_offset:1;
126 unsigned long show_width:1;
127 unsigned long show_iu:1;
128 unsigned long show_dt:1;
129 unsigned long show_qas:1;
130 unsigned long show_wr_flow:1;
131 unsigned long show_rd_strm:1;
132 unsigned long show_rti:1;
133 unsigned long show_pcomp_en:1;
134 unsigned long show_hold_mcs:1;
135 };
136
137 struct scsi_transport_template *spi_attach_transport(struct spi_function_template *);
138 void spi_release_transport(struct scsi_transport_template *);
139 void spi_schedule_dv_device(struct scsi_device *);
140 void spi_dv_device(struct scsi_device *);
141 void spi_display_xfer_agreement(struct scsi_target *);
142 int spi_print_msg(const unsigned char *);
143 int spi_populate_width_msg(unsigned char *msg, int width);
144 int spi_populate_sync_msg(unsigned char *msg, int period, int offset);
145 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset, int width,
146 int options);
147 int spi_populate_tag_msg(unsigned char *msg, struct scsi_cmnd *cmd);
148
149 #endif /* SCSI_TRANSPORT_SPI_H */
150
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