include/scsi/scsi_transport_spi.h

   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 */