include/scsi/scsi_transport_spi.h

   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
  89 #define spi_support_sync(x)     (((struct spi_transport_attrs *)&(x)->starget_data)->support_sync)
  90 #define spi_support_wide(x)     (((struct spi_transport_attrs *)&(x)->starget_data)->support_wide)
  91 #define spi_support_dt(x)       (((struct spi_transport_attrs *)&(x)->starget_data)->support_dt)
  92 #define spi_support_dt_only(x)  (((struct spi_transport_attrs *)&(x)->starget_data)->support_dt_only)
  93 #define spi_support_ius(x)      (((struct spi_transport_attrs *)&(x)->starget_data)->support_ius)
  94 #define spi_support_qas(x)      (((struct spi_transport_attrs *)&(x)->starget_data)->support_qas)
  95
  96 #define spi_flags(x)    (((struct spi_transport_attrs *)&(x)->starget_data)->flags)
  97 #define spi_signalling(h)       (((struct spi_host_attrs *)(h)->shost_data)->signalling)
  98
  99
 100
 101 /* The functions by which the transport class and the driver communicate */
 102 struct spi_function_template {
 103         void    (*get_period)(struct scsi_target *);
 104         void    (*set_period)(struct scsi_target *, int);
 105         void    (*get_offset)(struct scsi_target *);
 106         void    (*set_offset)(struct scsi_target *, int);
 107         void    (*get_width)(struct scsi_target *);
 108         void    (*set_width)(struct scsi_target *, int);
 109         void    (*get_iu)(struct scsi_target *);
 110         void    (*set_iu)(struct scsi_target *, int);
 111         void    (*get_dt)(struct scsi_target *);
 112         void    (*set_dt)(struct scsi_target *, int);
 113         void    (*get_qas)(struct scsi_target *);
 114         void    (*set_qas)(struct scsi_target *, int);
 115         void    (*get_wr_flow)(struct scsi_target *);
 116         void    (*set_wr_flow)(struct scsi_target *, int);
 117         void    (*get_rd_strm)(struct scsi_target *);
 118         void    (*set_rd_strm)(struct scsi_target *, int);
 119         void    (*get_rti)(struct scsi_target *);
 120         void    (*set_rti)(struct scsi_target *, int);
 121         void    (*get_pcomp_en)(struct scsi_target *);
 122         void    (*set_pcomp_en)(struct scsi_target *, int);
 123         void    (*get_hold_mcs)(struct scsi_target *);
 124         void    (*set_hold_mcs)(struct scsi_target *, int);
 125         void    (*get_signalling)(struct Scsi_Host *);
 126         void    (*set_signalling)(struct Scsi_Host *, enum spi_signal_type);
 127         int     (*deny_binding)(struct scsi_target *);
 128         /* The driver sets these to tell the transport class it
 129          * wants the attributes displayed in sysfs.  If the show_ flag
 130          * is not set, the attribute will be private to the transport
 131          * class */
 132         unsigned long   show_period:1;
 133         unsigned long   show_offset:1;
 134         unsigned long   show_width:1;
 135         unsigned long   show_iu:1;
 136         unsigned long   show_dt:1;
 137         unsigned long   show_qas:1;
 138         unsigned long   show_wr_flow:1;
 139         unsigned long   show_rd_strm:1;
 140         unsigned long   show_rti:1;
 141         unsigned long   show_pcomp_en:1;
 142         unsigned long   show_hold_mcs:1;
 143 };
 144
 145 struct scsi_transport_template *spi_attach_transport(struct spi_function_template *);
 146 void spi_release_transport(struct scsi_transport_template *);
 147 void spi_schedule_dv_device(struct scsi_device *);
 148 void spi_dv_device(struct scsi_device *);
 149 void spi_display_xfer_agreement(struct scsi_target *);
 150 int spi_print_msg(const unsigned char *);
 151 int spi_populate_width_msg(unsigned char *msg, int width);
 152 int spi_populate_sync_msg(unsigned char *msg, int period, int offset);
 153 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset, int width,
 154                 int options);
 155
 156 #endif /* SCSI_TRANSPORT_SPI_H */