drivers/scsi/st.h

   1
   2 #ifndef _ST_H
   3 #define _ST_H
   4 /*
   5    $Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/st.h,v 1.1 1992/04/24 18:01:50 root Exp root $
   6  */
   7
   8 #ifndef _SCSI_H
   9 #include "scsi.h"
  10 #endif
  11 #include <linux/devfs_fs_kernel.h>
  12
  13 /* The tape buffer descriptor. */
  14 typedef struct {
  15         unsigned char in_use;
  16         unsigned char dma;      /* DMA-able buffer */
  17         int buffer_size;
  18         int buffer_blocks;
  19         int buffer_bytes;
  20         int read_pointer;
  21         int writing;
  22         int midlevel_result;
  23         int syscall_result;
  24         Scsi_Request *last_SRpnt;
  25         unsigned char *b_data;
  26         unsigned short use_sg;  /* zero or number of segments for this adapter */
  27         unsigned short sg_segs; /* total number of allocated segments */
  28         unsigned short orig_sg_segs;    /* number of segments allocated at first try */
  29         struct scatterlist sg[1];       /* MUST BE last item */
  30 } ST_buffer;
  31
  32
  33 /* The tape mode definition */
  34 typedef struct {
  35         unsigned char defined;
  36         unsigned char sysv;     /* SYS V semantics? */
  37         unsigned char do_async_writes;
  38         unsigned char do_buffer_writes;
  39         unsigned char do_read_ahead;
  40         unsigned char defaults_for_writes;
  41         unsigned char default_compression;      /* 0 = don't touch, etc */
  42         short default_density;  /* Forced density, -1 = no value */
  43         int default_blksize;    /* Forced blocksize, -1 = no value */
  44 } ST_mode;
  45
  46 #define ST_NBR_MODE_BITS 2
  47 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
  48 #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
  49 #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
  50 #define ST_MAX_TAPES (1 << ST_MODE_SHIFT)
  51
  52 /* The status related to each partition */
  53 typedef struct {
  54         unsigned char rw;
  55         unsigned char eof;
  56         unsigned char at_sm;
  57         unsigned char last_block_valid;
  58         u32 last_block_visited;
  59         int drv_block;          /* The block where the drive head is */
  60         int drv_file;
  61 } ST_partstat;
  62
  63 #define ST_NBR_PARTITIONS 4
  64
  65 /* The tape drive descriptor */
  66 typedef struct {
  67         kdev_t devt;
  68         Scsi_Device *device;
  69         struct semaphore lock;  /* For serialization */
  70         struct semaphore sem;   /* For SCSI commands */
  71         ST_buffer *buffer;
  72
  73         /* Drive characteristics */
  74         unsigned char omit_blklims;
  75         unsigned char do_auto_lock;
  76         unsigned char can_bsr;
  77         unsigned char can_partitions;
  78         unsigned char two_fm;
  79         unsigned char fast_mteom;
  80         unsigned char restr_dma;
  81         unsigned char scsi2_logical;
  82         unsigned char default_drvbuffer;        /* 0xff = don't touch, value 3 bits */
  83         int tape_type;
  84         int write_threshold;
  85         int timeout;            /* timeout for normal commands */
  86         int long_timeout;       /* timeout for commands known to take long time */
  87
  88         /* Mode characteristics */
  89         ST_mode modes[ST_NBR_MODES];
  90         int current_mode;
  91         devfs_handle_t de_r[ST_NBR_MODES];  /*  Rewind entries     */
  92         devfs_handle_t de_n[ST_NBR_MODES];  /*  No-rewind entries  */
  93
  94         /* Status variables */
  95         int partition;
  96         int new_partition;
  97         int nbr_partitions;     /* zero until partition support enabled */
  98         ST_partstat ps[ST_NBR_PARTITIONS];
  99         unsigned char dirty;
 100         unsigned char ready;
 101         unsigned char write_prot;
 102         unsigned char drv_write_prot;
 103         unsigned char in_use;
 104         unsigned char blksize_changed;
 105         unsigned char density_changed;
 106         unsigned char compression_changed;
 107         unsigned char drv_buffer;
 108         unsigned char density;
 109         unsigned char door_locked;
 110         unsigned char autorew_dev;   /* auto-rewind device */
 111         unsigned char rew_at_close;  /* rewind necessary at close */
 112         unsigned char inited;
 113         int block_size;
 114         int min_block;
 115         int max_block;
 116         int recover_count;     /* From tape opening */
 117         int recover_reg;       /* From last status call */
 118
 119 #if DEBUG
 120         unsigned char write_pending;
 121         int nbr_finished;
 122         int nbr_waits;
 123         unsigned char last_cmnd[6];
 124         unsigned char last_sense[16];
 125 #endif
 126 } Scsi_Tape;
 127
 128
 129 /* Values of eof */
 130 #define ST_NOEOF        0
 131 #define ST_FM_HIT       1
 132 #define ST_FM           2
 133 #define ST_EOM_OK       3
 134 #define ST_EOM_ERROR    4
 135 #define ST_EOD_1        5
 136 #define ST_EOD_2        6
 137 #define ST_EOD          7
 138 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
 139    return zero => ST_EOD, return ENOSPC */
 140
 141 /* Values of rw */
 142 #define ST_IDLE         0
 143 #define ST_READING      1
 144 #define ST_WRITING      2
 145
 146 /* Values of ready state */
 147 #define ST_READY        0
 148 #define ST_NOT_READY    1
 149 #define ST_NO_TAPE      2
 150
 151 /* Values for door lock state */
 152 #define ST_UNLOCKED     0
 153 #define ST_LOCKED_EXPLICIT 1
 154 #define ST_LOCKED_AUTO  2
 155 #define ST_LOCK_FAILS   3
 156
 157 /* Positioning SCSI-commands for Tandberg, etc. drives */
 158 #define QFA_REQUEST_BLOCK       0x02
 159 #define QFA_SEEK_BLOCK          0x0c
 160
 161 /* Setting the binary options */
 162 #define ST_DONT_TOUCH  0
 163 #define ST_NO          1
 164 #define ST_YES         2
 165
 166 #endif