linux/include/scsi/scsi_transport_spi.h
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   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
  26struct scsi_transport_template;
  27struct scsi_target;
  28struct scsi_device;
  29struct Scsi_Host;
  30
  31struct 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
  63enum spi_signal_type {
  64        SPI_SIGNAL_UNKNOWN = 1,
  65        SPI_SIGNAL_SE,
  66        SPI_SIGNAL_LVD,
  67        SPI_SIGNAL_HVD,
  68};
  69
  70struct 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 */
 107struct 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
 150struct scsi_transport_template *spi_attach_transport(struct spi_function_template *);
 151void spi_release_transport(struct scsi_transport_template *);
 152void spi_schedule_dv_device(struct scsi_device *);
 153void spi_dv_device(struct scsi_device *);
 154void spi_display_xfer_agreement(struct scsi_target *);
 155int spi_print_msg(const unsigned char *);
 156int spi_populate_width_msg(unsigned char *msg, int width);
 157int spi_populate_sync_msg(unsigned char *msg, int period, int offset);
 158int spi_populate_ppr_msg(unsigned char *msg, int period, int offset, int width,
 159                int options);
 160
 161#endif /* SCSI_TRANSPORT_SPI_H */
 162
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