/*      $NetBSD: sd.c,v 1.17 2023/02/12 08:25:09 tsutsui Exp $        */
/*
* Copyright (c) 1994 Rolf Grossmann
* All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by Rolf Grossmann.
* 4. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/

#include <sys/param.h>
#include <sys/disklabel.h>
#include <sys/bootblock.h>
#include <dev/scsipi/scsi_spc.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_disk.h>
#include <lib/libsa/stand.h>
#include <lib/libkern/libkern.h> /* for bzero() */

#include "dmareg.h"
#include "scsivar.h"
#include "samachdep.h"

#ifdef SD_DEBUG
#define DPRINTF(x) printf x;
#else
#define DPRINTF(x)
#endif

struct sdminilabel {
   u_short npart;
   long offset[MAXPARTITIONS+1]; /* offset from absolute block 0! */
};

struct  sd_softc {
   int sc_unit;
   int sc_lun;
   int sc_part;
   int sc_dev_bsize;
   struct sdminilabel sc_pinfo;
};

#define NSD 7
#define MAXRETRIES 5    /* must be at least one */

int sdprobe(char target, char lun);
int sdgetinfo(struct sd_softc *ss);

int
sdprobe(char target, char lun)
{
   struct scsi_test_unit_ready cdb1;
   struct scsipi_inquiry cdb2;
   struct scsipi_inquiry_data inq;
   int error, retries;
   int count;

   memset(&cdb1, 0, sizeof(cdb1));
   cdb1.opcode =  SCSI_TEST_UNIT_READY;

   retries = 0;
   do {
           count = 0;
       error = scsiicmd(target, lun, (u_char *)&cdb1, sizeof(cdb1), NULL, &count);
       if (error == -SCSI_BUSY) {
               register int N = 10000000; while (--N > 0);
       }
   } while ((error == -SCSI_CHECK || error == -SCSI_BUSY)
            && retries++ < MAXRETRIES);

   if (error)
       return error<0 ? ENODEV : error;

   memset(&cdb2, 0, sizeof(cdb2));
   cdb2.opcode = INQUIRY;
   cdb2.length = SCSIPI_INQUIRY_LENGTH_SCSI2;
   count = SCSIPI_INQUIRY_LENGTH_SCSI2;
   error = scsiicmd(target, lun, (u_char *)&cdb2, sizeof(cdb2),
                    (char *)&inq, &count);
   if (error != 0)
     return error<0 ? EHER : error;

   if ((inq.device & SID_TYPE) != T_DIRECT
       && (inq.device & SID_TYPE) != T_CDROM)
     return EUNIT;     /* not a disk */

   DPRINTF(("booting disk %s.\n", inq.vendor));

   return 0;
}

int
sdgetinfo(struct sd_softc *ss)
{
   struct scsipi_read_capacity_10 cdb;
   struct scsipi_read_capacity_10_data cap;
   struct sdminilabel *pi = &ss->sc_pinfo;
   struct next68k_disklabel *label;
   int error, i, blklen;
   char io_buf[NEXT68K_LABEL_SIZE+NEXT68K_LABEL_OFFSET];
   int count;
   int sc_blkshift = 0;

   memset(&cdb, 0, sizeof(cdb));
   cdb.opcode = READ_CAPACITY_10;
   count = sizeof(cap);
   error = scsiicmd(ss->sc_unit, ss->sc_lun, (u_char *)&cdb, sizeof(cdb),
                    (char *)&cap, &count);
   if (error != 0)
       return error<0 ? EHER : error;
   blklen = (cap.length[0]<<24) + (cap.length[1]<<16)
            + (cap.length[2]<<8) + cap.length[3];

   /* avoid division by zero trap even on possible xfer errors */
   if (blklen == 0)
       blklen = DEV_BSIZE;
   ss->sc_dev_bsize = blklen;

   ss->sc_pinfo.offset[ss->sc_part] = 0; /* read absolute sector */
   error = sdstrategy(ss, F_READ, NEXT68K_LABEL_SECTOR,
                      NEXT68K_LABEL_SIZE+NEXT68K_LABEL_OFFSET, io_buf, (unsigned int *)&i);
   if (error != 0) {
       DPRINTF(("sdgetinfo: sdstrategy error %d\n", error));
       return(ERDLAB);
   }
   label = (struct next68k_disklabel *)(io_buf+NEXT68K_LABEL_OFFSET);

   if (!IS_DISKLABEL(label)) /*  || (label->cd_flags & CD_UNINIT)!=0) */
       return EUNLAB;          /* bad magic */

   /* XXX calculate checksum ... for now we rely on the magic number */
   DPRINTF(("Disk is %s (%s, %s).\n",
            label->cd_label,label->cd_name, label->cd_type));

   while (label->cd_secsize > blklen)
   {
       blklen <<= 1;
       ++sc_blkshift;
   }
   if (label->cd_secsize < blklen)
   {
       printf("bad label sectorsize (%d) or device blocksize (%d).\n",
              label->cd_secsize, blklen>>sc_blkshift);
       return ENXIO;
   }
   pi->npart = 0;
   for(i=0; i<MAXPARTITIONS; i++) {
       if (label->cd_partitions[i].cp_size > 0) {
           pi->offset[pi->npart] = (label->cd_partitions[i].cp_offset
                                    + label->cd_front) << sc_blkshift;
       }
       else
           pi->offset[pi->npart] = -1;
       DPRINTF (("%d: [%d]=%ld\n", i, pi->npart, pi->offset[pi->npart]));
       pi->npart++;
       if (pi->npart == RAW_PART)
           pi->npart++;
   }
   pi->offset[RAW_PART] = -1;

   return 0;
}

int
sdopen(struct open_file *f, ...)
{
   va_list ap;
   int count, lun, part;
   register struct sd_softc *ss;
   char unit, cnt;
   int error;

   va_start(ap, f);
   count = va_arg(ap, int);
   lun = va_arg(ap, int);
   part = va_arg(ap, int);
   va_end(ap);

   DPRINTF(("open: sd(%d,%d,%d)\n", count, lun, part));

   if (lun >= NSD)
       return EUNIT;

   scsi_init();

   for(cnt=0, unit=0; unit < NSD; unit++)
   {
       DPRINTF(("trying target %d lun %d.\n", unit, lun));
       error = sdprobe(unit, lun);
       if (error == 0)
       {
           if (cnt++ == count)
               break;
       }
       else if (error != EUNIT)
           return error;
   }

   if (unit >= NSD)
       return EUNIT;

   ss = alloc(sizeof(struct sd_softc));
   ss->sc_unit = unit;
   ss->sc_lun = lun;
   ss->sc_part = part;

   if ((error = sdgetinfo(ss)) != 0)
       return error;

   if ((unsigned char)part >= ss->sc_pinfo.npart
       || ss->sc_pinfo.offset[(int)part] == -1)
       return EPART;

   f->f_devdata = ss;
   return 0;
}

int
sdclose(struct open_file *f)
{
   register struct sd_softc *ss = f->f_devdata;

   dealloc(ss, sizeof(struct sd_softc));
   return 0;
}

int
sdstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
          void *buf, size_t *rsize)
{
   struct sd_softc *ss = devdata;
   u_long blk = dblk + ss->sc_pinfo.offset[ss->sc_part];
   struct scsipi_rw_10 cdb;
   int error;

   if (size == 0)
       return 0;

   if (rw != F_READ)
   {
       printf("sdstrategy: write not implemented.\n");
       return EOPNOTSUPP;
   }

   *rsize = 0;
   while (size > 0) {
           u_long nblks;
           int tsize;
           if (size > MAX_DMASIZE)
                   tsize = MAX_DMASIZE;
           else
                   tsize = size;

           nblks = howmany(tsize, ss->sc_dev_bsize);

           DPRINTF(("sdstrategy: read block %ld, %d bytes (%ld blks a %d bytes).\n",
                    blk, tsize, nblks, ss->sc_dev_bsize));

           memset(&cdb, 0, sizeof(cdb));
           cdb.opcode = READ_10;
           cdb.addr[0] = (blk & 0xff000000) >> 24;
           cdb.addr[1] = (blk & 0xff0000) >> 16;
           cdb.addr[2] = (blk & 0xff00) >> 8;
           cdb.addr[3] = blk & 0xff;
           cdb.length[0] = (nblks & 0xff00) >> 8;
           cdb.length[1] = nblks & 0xff;

           error = scsiicmd(ss->sc_unit, ss->sc_lun,
                            (u_char *)&cdb, sizeof(cdb), (char *)buf + *rsize, &tsize);
           if (error != 0)
           {
                   DPRINTF(("sdstrategy: scsiicmd failed: %d = %s.\n", error, strerror(error)));
                   return error<0 ? EIO : error;
           }
           *rsize += tsize;
           size -= tsize;
           blk += nblks;
   }
   DPRINTF(("sdstrategy: read %d bytes\n", *rsize));
   return 0;
}

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