Subversion Repositories or1k

#ifndef _ST_H

        #define _ST_H

/*

        $Header: /home/marcus/revision_ctrl_test/oc_cvs/cvs/or1k/uclinux/uClinux-2.0.x/drivers/scsi/st.h,v 1.1.1.1 2001-09-10 07:44:35 simons Exp $

*/

#ifndef _SCSI_H

#include "scsi.h"

#endif

/* The tape buffer descriptor. */

typedef struct {

  unsigned char in_use;

  unsigned char dma;    /* DMA-able buffer */

  int buffer_size;

  int buffer_blocks;

  int buffer_bytes;

  int read_pointer;

  int writing;

  int last_result;

  int last_result_fatal;

  unsigned char *b_data;

  int orig_size;

  unsigned char *orig_b_data;

} ST_buffer;

/* The tape mode definition */

typedef struct {

  unsigned char defined;

  unsigned char do_async_writes;

  unsigned char do_buffer_writes;

  unsigned char do_read_ahead;

  unsigned char defaults_for_writes;

  unsigned char default_compression; /* 0 = don't touch, etc */

  short default_density; /* Forced density, -1 = no value */

  int default_blksize;  /* Forced blocksize, -1 = no value */

} ST_mode;

#define ST_NBR_MODE_BITS 2

#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)

#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)

#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)

/* The status related to each partition */

typedef struct {

  unsigned char rw;

  unsigned char moves_after_eof;

  unsigned char at_sm;

  unsigned char last_block_valid;

  u32 last_block_visited;

} ST_partstat;

#define ST_NBR_PARTITIONS 4

/* The tape drive descriptor */

typedef struct {

  kdev_t devt;

  unsigned capacity;

  struct wait_queue * waiting;

  Scsi_Device* device;

  Scsi_Cmnd SCpnt;

  struct semaphore sem;

  ST_buffer * buffer;

  /* Drive characteristics */

  unsigned char omit_blklims;

  unsigned char do_auto_lock;

  unsigned char can_bsr;

  unsigned char can_partitions;

  unsigned char two_fm;

  unsigned char fast_mteom;

  unsigned char restr_dma;

  unsigned char scsi2_logical;

  unsigned char default_drvbuffer;  /* 0xff = don't touch, value 3 bits */

  int write_threshold;

  /* Mode characteristics */

  ST_mode modes[ST_NBR_MODES];

  int current_mode;

  /* Status variables */

  int partition;

  int new_partition;

  int nbr_partitions;    /* zero until partition support enabled */

  ST_partstat ps[ST_NBR_PARTITIONS];

  unsigned char dirty;

  unsigned char ready;

  unsigned char eof;

  unsigned char write_prot;

  unsigned char drv_write_prot;

  unsigned char in_use;

  unsigned char eof_hit;

  unsigned char blksize_changed;

  unsigned char density_changed;

  unsigned char compression_changed;

  unsigned char drv_buffer;

  unsigned char density;

  unsigned char door_locked;

  unsigned char rew_at_close;

  int block_size;

  int min_block;

  int max_block;

  int recover_count;

  int drv_block;        /* The block where the drive head is */

  struct mtget * mt_status;

#if DEBUG

  unsigned char write_pending;

  int nbr_finished;

  int nbr_waits;

#endif

} Scsi_Tape;

extern Scsi_Tape * scsi_tapes;

/* Values of eof */

#define ST_NOEOF        0

#define ST_FM           1

#define ST_EOM_OK       2

#define ST_EOM_ERROR    3

#define ST_EOD          4

/* Values of rw */

#define ST_IDLE         0

#define ST_READING      1

#define ST_WRITING      2

/* Values of ready state */

#define ST_READY        0

#define ST_NOT_READY    1

#define ST_NO_TAPE      2

/* Values for door lock state */

#define ST_UNLOCKED     0

#define ST_LOCKED_EXPLICIT 1

#define ST_LOCKED_AUTO  2

#define ST_LOCK_FAILS   3

/* Positioning SCSI-commands for Tandberg, etc. drives */

#define QFA_REQUEST_BLOCK       0x02

#define QFA_SEEK_BLOCK          0x0c

/* Setting the binary options */

#define ST_DONT_TOUCH  0

#define ST_NO          1

#define ST_YES         2

#endif