/*      $NetBSD: stvar.h,v 1.26 2018/03/24 08:08:19 mlelstv Exp $ */

/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*
* Originally written by Julian Elischer ([email protected])
* for TRW Financial Systems for use under the MACH(2.5) operating system.
*
* TRW Financial Systems, in accordance with their agreement with Carnegie
* Mellon University, makes this software available to CMU to distribute
* or use in any manner that they see fit as long as this message is kept with
* the software. For this reason TFS also grants any other persons or
* organisations permission to use or modify this software.
*
* TFS supplies this software to be publicly redistributed
* on the understanding that TFS is not responsible for the correct
* functioning of this software in any circumstances.
*
* Ported to run under 386BSD by Julian Elischer ([email protected]) Sept 1992
* major changes by Julian Elischer ([email protected]) May 1993
*
* A lot of rewhacking done by mjacob ([email protected]).
*/

#include <sys/rndsource.h>

#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>

#define ST_IO_TIME      (3 * 60 * 1000)         /* 3 minutes */
#define ST_CTL_TIME     (30 * 1000)             /* 30 seconds */
#define ST_SPC_TIME     (4 * 60 * 60 * 1000)    /* 4 hours */

#define ST_RETRIES      4       /* only on non IO commands */

struct modes {
       u_int quirks;                   /* same definitions as in quirkdata */
       int blksize;
       uint8_t density;
};

struct quirkdata {
       u_int quirks;
#define ST_Q_FORCE_BLKSIZE      0x0001
#define ST_Q_SENSE_HELP         0x0002  /* must do READ for good MODE SENSE */
#define ST_Q_IGNORE_LOADS       0x0004
#define ST_Q_BLKSIZE            0x0008  /* variable-block media_blksize > 0 */
#define ST_Q_UNIMODAL           0x0010  /* unimode drive rejects mode select */
#define ST_Q_NOPREVENT          0x0020  /* does not support PREVENT */
#define ST_Q_ERASE_NOIMM        0x0040  /* drive rejects ERASE/w Immed bit */
#define ST_Q_NOFILEMARKS        0x0080  /* can only write 0 filemarks */
       u_int page_0_size;
#define MAX_PAGE_0_SIZE 64
       struct modes modes[4];
};

struct st_quirk_inquiry_pattern {
       struct scsipi_inquiry_pattern pattern;
       struct quirkdata quirkdata;
};

struct st_softc {
       device_t sc_dev;
/*--------------------callback to bus-specific code--------------------------*/
       int (*ops)(struct st_softc *, int, int);
#define ST_OPS_RBL              0x00    /* read block limit */
#define ST_OPS_MODESENSE        0x01    /* mode sense */
#define ST_OPS_MODESELECT       0x02    /* mode select */
#define ST_OPS_CMPRSS_ON        0x03    /* turn on compression */
#define ST_OPS_CMPRSS_OFF       0x04    /* turn off compression */
/*--------------------present operating parameters, flags etc.---------------*/
       int flags;              /* see below                         */
       u_int quirks;           /* quirks for the open mode          */
       int blksize;            /* blksize we are using              */
       uint8_t density;        /* present density                   */
       u_int page_0_size;      /* size of page 0 data               */
       u_int last_dsty;        /* last density opened               */
       short mt_resid;         /* last (short) resid                */
       short mt_erreg;         /* last error (sense key) seen       */
       /* relative to BOT location */
       daddr_t fileno;
       daddr_t blkno;
       int32_t last_io_resid;
       int32_t last_ctl_resid;
#define mt_key  mt_erreg
       uint8_t asc;            /* last asc code seen                */
       uint8_t ascq;           /* last asc code seen                */
/*--------------------device/scsi parameters---------------------------------*/
       struct scsipi_periph *sc_periph;/* our link to the adpter etc.       */
/*--------------------parameters reported by the device ---------------------*/
       int blkmin;             /* min blk size                       */
       int blkmax;             /* max blk size                       */
       const struct quirkdata *quirkdata;      /* if we have a rogue entry  */
/*--------------------parameters reported by the device for this media-------*/
       u_long numblks;         /* nominal blocks capacity            */
       int media_blksize;      /* 0 if not ST_FIXEDBLOCKS            */
       uint8_t media_density;  /* this is what it said when asked    */
/*--------------------quirks for the whole drive-----------------------------*/
       u_int drive_quirks;     /* quirks of this drive               */
/*--------------------How we should set up when opening each minor device----*/
       struct modes modes[4];  /* plus more for each mode            */
       uint8_t  modeflags[4];  /* flags for the modes                */
#define DENSITY_SET_BY_USER     0x01
#define DENSITY_SET_BY_QUIRK    0x02
#define BLKSIZE_SET_BY_USER     0x04
#define BLKSIZE_SET_BY_QUIRK    0x08
/*--------------------storage for sense data returned by the drive-----------*/
       u_char sense_data[MAX_PAGE_0_SIZE];     /*
                                                * additional sense data needed
                                                * for mode sense/select.
                                                */
       struct bufq_state *buf_queue;   /* the queue of pending IO */
                                       /* operations */
       struct bufq_state *buf_defer;   /* the queue of deferred IO */
                                       /* operations */
       struct callout sc_callout;      /* restarting the queue after */
                                       /* transient error */

       struct io_stats *stats;         /* statistics for the drive */

       krndsource_t    rnd_source;
       kmutex_t        sc_iolock;
};

#define ST_INFO_VALID   0x0001
#define ST_BLOCK_SET    0x0002  /* block size, mode set by ioctl      */
#define ST_WRITTEN      0x0004  /* data has been written, EOD needed */
#define ST_FIXEDBLOCKS  0x0008
#define ST_AT_FILEMARK  0x0010
#define ST_EIO_PENDING  0x0020  /* error reporting deferred until next op */
#define ST_NEW_MOUNT    0x0040  /* still need to decide mode             */
#define ST_READONLY     0x0080  /* st_mode_sense says write protected */
#define ST_FM_WRITTEN   0x0100  /*
                                * EOF file mark written  -- used with
                                * ~ST_WRITTEN to indicate that multiple file
                                * marks have been written
                                */
#define ST_BLANK_READ   0x0200  /* BLANK CHECK encountered already */
#define ST_2FM_AT_EOD   0x0400  /* write 2 file marks at EOD */
#define ST_MOUNTED      0x0800  /* Device is presently mounted */
#define ST_DONTBUFFER   0x1000  /* Disable buffering/caching */
#define ST_EARLYWARN    0x2000  /* Do (deferred) EOM for variable mode */
#define ST_EOM_PENDING  0x4000  /* EOM reporting deferred until next op */
#define ST_POSUPDATED   0x8000  /* tape position already updated */

#define ST_PER_ACTION   (ST_AT_FILEMARK | ST_EIO_PENDING | ST_EOM_PENDING | \
                        ST_BLANK_READ)
#define ST_PER_MOUNT    (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN |    \
                        ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \
                        ST_2FM_AT_EOD | ST_PER_ACTION | ST_POSUPDATED)

void    stattach(device_t, device_t, void *);
int     stdetach(device_t, int);
int     st_mode_select(struct st_softc *, int);

extern struct cfdriver st_cd;

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