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 max_iu:1;
40 	unsigned int dt:1;	/* DT clocking enabled */
41 	unsigned int qas:1;	/* Quick Arbitration and Selection enabled */
42 	unsigned int max_qas:1;
43 	unsigned int wr_flow:1;	/* Write Flow control enabled */
44 	unsigned int rd_strm:1;	/* Read streaming enabled */
45 	unsigned int rti:1;	/* Retain Training Information */
46 	unsigned int pcomp_en:1;/* Precompensation enabled */
47 	unsigned int hold_mcs:1;/* Hold Margin Control Settings */
48 	unsigned int initial_dv:1; /* DV done to this target yet  */
49 	unsigned long flags;	/* flags field for drivers to use */
50 	/* Device Properties fields */
51 	unsigned int support_sync:1; /* synchronous support */
52 	unsigned int support_wide:1; /* wide support */
53 	unsigned int support_dt:1; /* allows DT phases */
54 	unsigned int support_dt_only; /* disallows ST phases */
55 	unsigned int support_ius; /* support Information Units */
56 	unsigned int support_qas; /* supports quick arbitration and selection */
57 	/* Private Fields */
58 	unsigned int dv_pending:1; /* Internal flag: DV Requested */
59 	unsigned int dv_in_progress:1;	/* Internal: DV started */
60 	struct mutex dv_mutex; /* semaphore to serialise dv */
61 };
62 
63 enum spi_signal_type {
64 	SPI_SIGNAL_UNKNOWN = 1,
65 	SPI_SIGNAL_SE,
66 	SPI_SIGNAL_LVD,
67 	SPI_SIGNAL_HVD,
68 };
69 
70 struct spi_host_attrs {
71 	enum spi_signal_type signalling;
72 };
73 
74 /* accessor functions */
75 #define spi_period(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->period)
76 #define spi_min_period(x) (((struct spi_transport_attrs *)&(x)->starget_data)->min_period)
77 #define spi_offset(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->offset)
78 #define spi_max_offset(x) (((struct spi_transport_attrs *)&(x)->starget_data)->max_offset)
79 #define spi_width(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->width)
80 #define spi_max_width(x) (((struct spi_transport_attrs *)&(x)->starget_data)->max_width)
81 #define spi_iu(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->iu)
82 #define spi_max_iu(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->max_iu)
83 #define spi_dt(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->dt)
84 #define spi_qas(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->qas)
85 #define spi_max_qas(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->max_qas)
86 #define spi_wr_flow(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->wr_flow)
87 #define spi_rd_strm(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->rd_strm)
88 #define spi_rti(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->rti)
89 #define spi_pcomp_en(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->pcomp_en)
90 #define spi_hold_mcs(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->hold_mcs)
91 #define spi_initial_dv(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->initial_dv)
92 #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
93 
94 #define spi_support_sync(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->support_sync)
95 #define spi_support_wide(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->support_wide)
96 #define spi_support_dt(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->support_dt)
97 #define spi_support_dt_only(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->support_dt_only)
98 #define spi_support_ius(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->support_ius)
99 #define spi_support_qas(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->support_qas)
100 
101 #define spi_flags(x)	(((struct spi_transport_attrs *)&(x)->starget_data)->flags)
102 #define spi_signalling(h)	(((struct spi_host_attrs *)(h)->shost_data)->signalling)
103 
104 
105 
106 /* The functions by which the transport class and the driver communicate */
107 struct spi_function_template {
108 	void	(*get_period)(struct scsi_target *);
109 	void	(*set_period)(struct scsi_target *, int);
110 	void	(*get_offset)(struct scsi_target *);
111 	void	(*set_offset)(struct scsi_target *, int);
112 	void	(*get_width)(struct scsi_target *);
113 	void	(*set_width)(struct scsi_target *, int);
114 	void	(*get_iu)(struct scsi_target *);
115 	void	(*set_iu)(struct scsi_target *, int);
116 	void	(*get_dt)(struct scsi_target *);
117 	void	(*set_dt)(struct scsi_target *, int);
118 	void	(*get_qas)(struct scsi_target *);
119 	void	(*set_qas)(struct scsi_target *, int);
120 	void	(*get_wr_flow)(struct scsi_target *);
121 	void	(*set_wr_flow)(struct scsi_target *, int);
122 	void	(*get_rd_strm)(struct scsi_target *);
123 	void	(*set_rd_strm)(struct scsi_target *, int);
124 	void	(*get_rti)(struct scsi_target *);
125 	void	(*set_rti)(struct scsi_target *, int);
126 	void	(*get_pcomp_en)(struct scsi_target *);
127 	void	(*set_pcomp_en)(struct scsi_target *, int);
128 	void	(*get_hold_mcs)(struct scsi_target *);
129 	void	(*set_hold_mcs)(struct scsi_target *, int);
130 	void	(*get_signalling)(struct Scsi_Host *);
131 	void	(*set_signalling)(struct Scsi_Host *, enum spi_signal_type);
132 	int	(*deny_binding)(struct scsi_target *);
133 	/* The driver sets these to tell the transport class it
134 	 * wants the attributes displayed in sysfs.  If the show_ flag
135 	 * is not set, the attribute will be private to the transport
136 	 * class */
137 	unsigned long	show_period:1;
138 	unsigned long	show_offset:1;
139 	unsigned long	show_width:1;
140 	unsigned long	show_iu:1;
141 	unsigned long	show_dt:1;
142 	unsigned long	show_qas:1;
143 	unsigned long	show_wr_flow:1;
144 	unsigned long	show_rd_strm:1;
145 	unsigned long	show_rti:1;
146 	unsigned long	show_pcomp_en:1;
147 	unsigned long	show_hold_mcs:1;
148 };
149 
150 struct scsi_transport_template *spi_attach_transport(struct spi_function_template *);
151 void spi_release_transport(struct scsi_transport_template *);
152 void spi_schedule_dv_device(struct scsi_device *);
153 void spi_dv_device(struct scsi_device *);
154 void spi_display_xfer_agreement(struct scsi_target *);
155 int spi_print_msg(const unsigned char *);
156 int spi_populate_width_msg(unsigned char *msg, int width);
157 int spi_populate_sync_msg(unsigned char *msg, int period, int offset);
158 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset, int width,
159 		int options);
160 
161 #endif /* SCSI_TRANSPORT_SPI_H */
162