/*      $NetBSD: st_scsi.c,v 1.37 2015/08/24 23:13:15 pooka Exp $ */

/*-
* Copyright (c) 1998, 2004 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: st_scsi.c,v 1.37 2015/08/24 23:13:15 pooka Exp $");

#ifdef _KERNEL_OPT
#include "opt_scsi.h"
#endif

#include <sys/param.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/systm.h>

#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsi_tape.h>
#include <dev/scsipi/stvar.h>

static int      st_scsibus_match(device_t, cfdata_t, void *);
static void     st_scsibus_attach(device_t, device_t, void *);
static int      st_scsibus_ops(struct st_softc *, int, int);
static int      st_scsibus_read_block_limits(struct st_softc *, int);
static int      st_scsibus_mode_sense(struct st_softc *, int);
static int      st_scsibus_cmprss(struct st_softc *, int, int);

CFATTACH_DECL_NEW(
       st_scsibus,
       sizeof(struct st_softc),
       st_scsibus_match,
       st_scsibus_attach,
       stdetach,
       NULL
);

static const struct scsipi_inquiry_pattern st_scsibus_patterns[] = {
       {T_SEQUENTIAL, T_REMOV,
        "",         "",                 ""},
};

static int
st_scsibus_match(device_t parent, cfdata_t match, void *aux)
{
       struct scsipibus_attach_args *sa = aux;
       int priority;

       if (SCSIPI_BUSTYPE_TYPE(scsipi_periph_bustype(sa->sa_periph)) !=
           SCSIPI_BUSTYPE_SCSI)
               return 0;

       (void)scsipi_inqmatch(&sa->sa_inqbuf,
           st_scsibus_patterns,
           sizeof(st_scsibus_patterns)/sizeof(st_scsibus_patterns[0]),
           sizeof(st_scsibus_patterns[0]), &priority);
       return priority;
}

static void
st_scsibus_attach(device_t parent, device_t self, void *aux)
{
       struct st_softc *st = device_private(self);

       st->ops = st_scsibus_ops;
       stattach(parent, self, aux);
}

static int
st_scsibus_ops(struct st_softc *st, int op, int flags)
{
       switch(op) {
       case ST_OPS_RBL:
               return st_scsibus_read_block_limits(st, flags);
       case ST_OPS_MODESENSE:
               return st_scsibus_mode_sense(st, flags);
       case ST_OPS_MODESELECT:
               return st_mode_select(st, flags);
       case ST_OPS_CMPRSS_ON:
       case ST_OPS_CMPRSS_OFF:
               return st_scsibus_cmprss(st, flags,
                   (op == ST_OPS_CMPRSS_ON) ? 1 : 0);
       default:
               panic("st_scsibus_ops: invalid op");
               return 0; /* XXX to appease gcc */
       }
       /* NOTREACHED */
}

/*
* Ask the drive what its min and max blk sizes are.
*/
static int
st_scsibus_read_block_limits(struct st_softc *st, int flags)
{
       struct scsi_block_limits cmd;
       struct scsi_block_limits_data block_limits;
       struct scsipi_periph *periph = st->sc_periph;
       int error;

       /* do a 'Read Block Limits' */
       memset(&cmd, 0, sizeof(cmd));
       cmd.opcode = READ_BLOCK_LIMITS;

       /* do the command, update the global values */
       error = scsipi_command(periph, (void *)&cmd, sizeof(cmd),
           (void *)&block_limits, sizeof(block_limits),
           ST_RETRIES, ST_CTL_TIME, NULL, flags | XS_CTL_DATA_IN);
       if (error)
               return error;

       st->blkmin = _2btol(block_limits.min_length);
       st->blkmax = _3btol(block_limits.max_length);

       SC_DEBUG(periph, SCSIPI_DB3,
           ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax));
       return 0;
}

/*
* Get the scsi driver to send a full inquiry to the
* device and use the results to fill out the global
* parameter structure.
*
* called from:
* attach
* open
* ioctl (to reset original blksize)
*/
static int
st_scsibus_mode_sense(struct st_softc *st, int flags)
{
       u_int scsipi_sense_len;
       int error;
       struct scsipi_sense {
               struct scsi_mode_parameter_header_6 header;
               struct scsi_general_block_descriptor blk_desc;
               u_char sense_data[MAX_PAGE_0_SIZE];
       } scsipi_sense;
       struct scsipi_periph *periph = st->sc_periph;

       scsipi_sense_len = sizeof(scsipi_sense.header) +
                          sizeof(scsipi_sense.blk_desc) +
                          st->page_0_size;

       /*
        * Set up a mode sense
        * We don't need the results. Just print them for our interest's sake,
        * if asked, or if we need it as a template for the mode select store
        * it away.
        */
       error = scsipi_mode_sense(st->sc_periph, 0, SMS_PCTRL_CURRENT,
           &scsipi_sense.header, scsipi_sense_len, flags,
           ST_RETRIES, ST_CTL_TIME);
       if (error)
               return error;

       st->numblks = _3btol(scsipi_sense.blk_desc.nblocks);
       st->media_blksize = _3btol(scsipi_sense.blk_desc.blklen);
       st->media_density = scsipi_sense.blk_desc.density;
       if (scsipi_sense.header.dev_spec & SMH_DSP_WRITE_PROT)
               st->flags |= ST_READONLY;
       else
               st->flags &= ~ST_READONLY;
       SC_DEBUG(periph, SCSIPI_DB3,
           ("density code %d, %d-byte blocks, write-%s, ",
           st->media_density, st->media_blksize,
           st->flags & ST_READONLY ? "protected" : "enabled"));
       SC_DEBUG(periph, SCSIPI_DB3,
           ("%sbuffered\n",
           scsipi_sense.header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un"));
       if (st->page_0_size)
               memcpy(st->sense_data, scsipi_sense.sense_data,
                   st->page_0_size);
       periph->periph_flags |= PERIPH_MEDIA_LOADED;
       return 0;
}

static int
st_scsibus_cmprss(struct st_softc *st, int flags, int onoff)
{
       u_int scsi_dlen;
       int byte2, page;
       struct scsi_select {
               struct scsi_mode_parameter_header_6 header;
               struct scsi_general_block_descriptor blk_desc;
               u_char pdata[MAX(sizeof(struct scsi_tape_dev_conf_page),
                   sizeof(struct scsi_tape_dev_compression_page))];
       } scsi_pdata;
       struct scsi_tape_dev_conf_page *ptr;
       struct scsi_tape_dev_compression_page *cptr;
       struct scsipi_periph *periph = st->sc_periph;
       int error, ison;

       scsi_dlen = sizeof(scsi_pdata);
       /* Do DATA COMPRESSION page first. */
       page = SMS_PCTRL_CURRENT | 0xf;
       byte2 = 0;

       /*  Do the MODE SENSE command... */
again:
       memset(&scsi_pdata, 0, scsi_dlen);
       error = scsipi_mode_sense(periph, byte2, page,
           &scsi_pdata.header, scsi_dlen, flags, ST_RETRIES, ST_CTL_TIME);

       if (error) {
               if (byte2 != SMS_DBD) {
                       byte2 = SMS_DBD;
                       goto again;
               }
               /* Try a different page? */
               if (page == (SMS_PCTRL_CURRENT | 0xf)) {
                       page = SMS_PCTRL_CURRENT | 0x10;
                       byte2 = 0;
                       goto again;
               }
               return error;
       }

       if (scsi_pdata.header.blk_desc_len)
               ptr = (struct scsi_tape_dev_conf_page *) scsi_pdata.pdata;
       else
               ptr = (struct scsi_tape_dev_conf_page *) &scsi_pdata.blk_desc;

       if ((page & SMS_PAGE_MASK) == 0xf) {
               cptr = (struct scsi_tape_dev_compression_page *) ptr;
               ison = (cptr->dce_dcc & DCP_DCE) != 0;
               if (onoff)
                       cptr->dce_dcc |= DCP_DCE;
               else
                       cptr->dce_dcc &= ~DCP_DCE;
               cptr->pagecode &= ~0x80;
       } else {
               ison =  (ptr->sel_comp_alg != 0);
               if (onoff)
                       ptr->sel_comp_alg = 1;
               else
                       ptr->sel_comp_alg = 0;
               ptr->pagecode &= ~0x80;
               ptr->byte2 = 0;
               ptr->active_partition = 0;
               ptr->wb_full_ratio = 0;
               ptr->rb_empty_ratio = 0;
               ptr->byte8 &= ~0x30;
               ptr->gap_size = 0;
               ptr->byte10 &= ~0xe7;
               ptr->ew_bufsize[0] = 0;
               ptr->ew_bufsize[1] = 0;
               ptr->ew_bufsize[2] = 0;
               ptr->reserved = 0;
       }
       /*
        * There might be a virtue in actually doing the MODE SELECTS,
        * but let's not clog the bus over it.
        */
       if (onoff == ison)
               return 0;

       /* Set up for a mode select */
       scsi_pdata.header.data_length = 0;
       scsi_pdata.header.medium_type = 0;
       if ((st->flags & ST_DONTBUFFER) == 0)
               scsi_pdata.header.dev_spec = SMH_DSP_BUFF_MODE_ON;
       else
               scsi_pdata.header.dev_spec = 0;

       if (scsi_pdata.header.blk_desc_len) {
               scsi_pdata.blk_desc.density = 0;
               scsi_pdata.blk_desc.nblocks[0] = 0;
               scsi_pdata.blk_desc.nblocks[1] = 0;
               scsi_pdata.blk_desc.nblocks[2] = 0;
       }

       /* Do the command */
       error = scsipi_mode_select(periph, SMS_PF, &scsi_pdata.header,
           scsi_dlen, flags, ST_RETRIES, ST_CTL_TIME);

       if (error && (page & SMS_PAGE_MASK) == 0xf) {
               /* Try DEVICE CONFIGURATION page. */
               page = SMS_PCTRL_CURRENT | 0x10;
               goto again;
       }
       return error;
}

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