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/config.h>
  24 #include <linux/transport_class.h>
  25
  26 struct scsi_transport_template;
  27
  28 struct spi_transport_attrs {
  29         int period;             /* value in the PPR/SDTR command */
  30         int offset;
  31         unsigned int width:1;   /* 0 - narrow, 1 - wide */
  32         unsigned int iu:1;      /* Information Units enabled */
  33         unsigned int dt:1;      /* DT clocking enabled */
  34         unsigned int qas:1;     /* Quick Arbitration and Selection enabled */
  35         unsigned int wr_flow:1; /* Write Flow control enabled */
  36         unsigned int rd_strm:1; /* Read streaming enabled */
  37         unsigned int rti:1;     /* Retain Training Information */
  38         unsigned int pcomp_en:1;/* Precompensation enabled */
  39         unsigned int initial_dv:1; /* DV done to this target yet  */
  40         unsigned long flags;    /* flags field for drivers to use */
  41         /* Device Properties fields */
  42         unsigned int support_sync:1; /* synchronous support */
  43         unsigned int support_wide:1; /* wide support */
  44         unsigned int support_dt:1; /* allows DT phases */
  45         unsigned int support_dt_only; /* disallows ST phases */
  46         unsigned int support_ius; /* support Information Units */
  47         unsigned int support_qas; /* supports quick arbitration and selection */
  48         /* Private Fields */
  49         unsigned int dv_pending:1; /* Internal flag */
  50         struct semaphore dv_sem; /* semaphore to serialise dv */
  51 };
  52
  53 enum spi_signal_type {
  54         SPI_SIGNAL_UNKNOWN = 1,
  55         SPI_SIGNAL_SE,
  56         SPI_SIGNAL_LVD,
  57         SPI_SIGNAL_HVD,
  58 };
  59
  60 struct spi_host_attrs {
  61         enum spi_signal_type signalling;
  62 };
  63
  64 /* accessor functions */
  65 #define spi_period(x)   (((struct spi_transport_attrs *)&(x)->starget_data)->period)
  66 #define spi_offset(x)   (((struct spi_transport_attrs *)&(x)->starget_data)->offset)
  67 #define spi_width(x)    (((struct spi_transport_attrs *)&(x)->starget_data)->width)
  68 #define spi_iu(x)       (((struct spi_transport_attrs *)&(x)->starget_data)->iu)
  69 #define spi_dt(x)       (((struct spi_transport_attrs *)&(x)->starget_data)->dt)
  70 #define spi_qas(x)      (((struct spi_transport_attrs *)&(x)->starget_data)->qas)
  71 #define spi_wr_flow(x)  (((struct spi_transport_attrs *)&(x)->starget_data)->wr_flow)
  72 #define spi_rd_strm(x)  (((struct spi_transport_attrs *)&(x)->starget_data)->rd_strm)
  73 #define spi_rti(x)      (((struct spi_transport_attrs *)&(x)->starget_data)->rti)
  74 #define spi_pcomp_en(x) (((struct spi_transport_attrs *)&(x)->starget_data)->pcomp_en)
  75 #define spi_initial_dv(x)       (((struct spi_transport_attrs *)&(x)->starget_data)->initial_dv)
  76
  77 #define spi_support_sync(x)     (((struct spi_transport_attrs *)&(x)->starget_data)->support_sync)
  78 #define spi_support_wide(x)     (((struct spi_transport_attrs *)&(x)->starget_data)->support_wide)
  79 #define spi_support_dt(x)       (((struct spi_transport_attrs *)&(x)->starget_data)->support_dt)
  80 #define spi_support_dt_only(x)  (((struct spi_transport_attrs *)&(x)->starget_data)->support_dt_only)
  81 #define spi_support_ius(x)      (((struct spi_transport_attrs *)&(x)->starget_data)->support_ius)
  82 #define spi_support_qas(x)      (((struct spi_transport_attrs *)&(x)->starget_data)->support_qas)
  83
  84 #define spi_flags(x)    (((struct spi_transport_attrs *)&(x)->starget_data)->flags)
  85 #define spi_signalling(h)       (((struct spi_host_attrs *)(h)->shost_data)->signalling)
  86
  87
  88
  89 /* The functions by which the transport class and the driver communicate */
  90 struct spi_function_template {
  91         void    (*get_period)(struct scsi_target *);
  92         void    (*set_period)(struct scsi_target *, int);
  93         void    (*get_offset)(struct scsi_target *);
  94         void    (*set_offset)(struct scsi_target *, int);
  95         void    (*get_width)(struct scsi_target *);
  96         void    (*set_width)(struct scsi_target *, int);
  97         void    (*get_iu)(struct scsi_target *);
  98         void    (*set_iu)(struct scsi_target *, int);
  99         void    (*get_dt)(struct scsi_target *);
 100         void    (*set_dt)(struct scsi_target *, int);
 101         void    (*get_qas)(struct scsi_target *);
 102         void    (*set_qas)(struct scsi_target *, int);
 103         void    (*get_wr_flow)(struct scsi_target *);
 104         void    (*set_wr_flow)(struct scsi_target *, int);
 105         void    (*get_rd_strm)(struct scsi_target *);
 106         void    (*set_rd_strm)(struct scsi_target *, int);
 107         void    (*get_rti)(struct scsi_target *);
 108         void    (*set_rti)(struct scsi_target *, int);
 109         void    (*get_pcomp_en)(struct scsi_target *);
 110         void    (*set_pcomp_en)(struct scsi_target *, int);
 111         void    (*get_signalling)(struct Scsi_Host *);
 112         void    (*set_signalling)(struct Scsi_Host *, enum spi_signal_type);
 113         /* The driver sets these to tell the transport class it
 114          * wants the attributes displayed in sysfs.  If the show_ flag
 115          * is not set, the attribute will be private to the transport
 116          * class */
 117         unsigned long   show_period:1;
 118         unsigned long   show_offset:1;
 119         unsigned long   show_width:1;
 120         unsigned long   show_iu:1;
 121         unsigned long   show_dt:1;
 122         unsigned long   show_qas:1;
 123         unsigned long   show_wr_flow:1;
 124         unsigned long   show_rd_strm:1;
 125         unsigned long   show_rti:1;
 126         unsigned long   show_pcomp_en:1;
 127 };
 128
 129 struct scsi_transport_template *spi_attach_transport(struct spi_function_template *);
 130 void spi_release_transport(struct scsi_transport_template *);
 131 void spi_schedule_dv_device(struct scsi_device *);
 132 void spi_dv_device(struct scsi_device *);
 133 void spi_display_xfer_agreement(struct scsi_target *);
 134
 135 #endif /* SCSI_TRANSPORT_SPI_H */