/*      $NetBSD: ata_raid_via.c,v 1.11 2025/03/11 16:51:31 andvar Exp $ */

/*-
* Copyright (c) 2000,2001,2002 S�ren Schmidt <[email protected]>
* 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,
*    without modification, immediately at the beginning of the file.
* 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. 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.
*/

/*
* Support for parsing VIA V-RAID ATA RAID controller configuration blocks.
*
* Adapted to NetBSD by Tim Rightnour ([email protected])
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ata_raid_via.c,v 1.11 2025/03/11 16:51:31 andvar Exp $");

#include <sys/param.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/fcntl.h>
#include <sys/vnode.h>
#include <sys/kauth.h>

#include <miscfs/specfs/specdev.h>

#include <dev/ata/atareg.h>
#include <dev/ata/atavar.h>
#include <dev/ata/wdvar.h>

#include <dev/ata/ata_raidreg.h>
#include <dev/ata/ata_raidvar.h>

#ifdef ATA_RAID_DEBUG
#define DPRINTF(x)      printf x
#else
#define DPRINTF(x)      /* nothing */
#endif

#ifdef ATA_RAID_DEBUG
static const char *
ata_raid_via_type(int type)
{
       static char buffer[16];

       switch (type) {
       case VIA_T_RAID0:   return "RAID0";
       case VIA_T_RAID1:   return "RAID1";
       case VIA_T_RAID5:   return "RAID5";
       case VIA_T_RAID01:  return "RAID0+1";
       case VIA_T_SPAN:    return "SPAN";
       default:
               snprintf(buffer, sizeof(buffer), "UNKNOWN 0x%02x", type);
               return buffer;
       }
}

static void
ata_raid_via_print_info(struct via_raid_conf *info)
{
       int i;

       printf("*************** ATA VIA Metadata ****************\n");
       printf("magic               0x%02x\n", info->magic);
       printf("dummy_0             0x%02x\n", info->dummy_0);
       printf("type                %s\n",
           ata_raid_via_type(info->type & VIA_T_MASK));
       printf("bootable            %d\n", info->type & VIA_T_BOOTABLE);
       printf("unknown             %d\n", info->type & VIA_T_UNKNOWN);
       printf("disk_index          0x%02x\n", info->disk_index);
       printf("stripe_layout       0x%02x\n", info->stripe_layout);
       printf(" stripe_disks       %d\n", info->stripe_layout & VIA_L_DISKS);
       printf(" stripe_sectors     %d\n",
           0x08 << ((info->stripe_layout & VIA_L_MASK) >> VIA_L_SHIFT));
       printf("disk_sectors        %ju\n", info->disk_sectors);
       printf("disk_id             0x%08x\n", info->disk_id);
       printf("DISK#   disk_id\n");
       for (i = 0; i < 8; i++) {
       if (info->disks[i])
               printf("  %d    0x%08x\n", i, info->disks[i]);
       }
       printf("checksum            0x%02x\n", info->checksum);
       printf("=================================================\n");
}
#endif

int
ata_raid_read_config_via(struct wd_softc *sc)
{
       struct dk_softc *dksc = &sc->sc_dksc;
       struct via_raid_conf *info;
       struct vnode *vp;
       int bmajor, error;
       dev_t dev;
       uint32_t drive;
       uint8_t checksum, checksum_alt, byte3, *ptr;
       int count, disk;
       struct ataraid_array_info *aai;
       struct ataraid_disk_info *adi;

       info = kmem_zalloc(sizeof(*info), KM_SLEEP);

       bmajor = devsw_name2blk(dksc->sc_xname, NULL, 0);

       /* Get a vnode for the raw partition of this disk. */
       dev = MAKEDISKDEV(bmajor, device_unit(dksc->sc_dev), RAW_PART);
       error = bdevvp(dev, &vp);
       if (error)
               goto out;

       vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
       error = VOP_OPEN(vp, FREAD, NOCRED);
       if (error) {
               vput(vp);
               goto out;
       }

       error = ata_raid_config_block_rw(vp, VIA_LBA(sc), info,
           sizeof(*info), B_READ);
       VOP_CLOSE(vp, FREAD, NOCRED);
       vput(vp);
       if (error) {
               aprint_error_dev(dksc->sc_dev,
                   "error %d reading VIA V-RAID config block\n", error);
               goto out;
       }

#ifdef ATA_RAID_DEBUG
       ata_raid_via_print_info(info);
       printf("MAGIC == 0x%02x\n", info->magic);
#endif

       /* Check the signature. */
       if (info->magic != VIA_MAGIC) {
               DPRINTF(("%s: VIA V-RAID signature check failed\n",
                   dksc->sc_xname));
               error = ESRCH;
               goto out;
       }

       /* calculate checksum and compare for valid */
       for (byte3 = 0, checksum = 0, ptr = (uint8_t *)info, count = 0;
           count < 50; count++)
               if (count == 3)
                       byte3 = *ptr++;
               else
                       checksum += *ptr++;
       checksum_alt = checksum + (byte3 & ~VIA_T_BOOTABLE);
       checksum += byte3;
       if (checksum != info->checksum && checksum_alt != info->checksum) {
               DPRINTF(("%s: VIA V-RAID checksum failed 0x%02x != "
                   "0x%02x or 0x%02x\n", dksc->sc_xname,
                   info->checksum, checksum, checksum_alt));
               error = ESRCH;
               goto out;
       }

       /*
        * Lookup or allocate a new array info structure for
        * this array. Use the serial number of disk0 as the array#
        */
       aai = ata_raid_get_array_info(ATA_RAID_TYPE_VIA, info->disks[0]);

       aai->aai_status = AAI_S_READY;

       switch (info->type & VIA_T_MASK) {
       case VIA_T_RAID0:
               aai->aai_level = AAI_L_RAID0;
               aai->aai_width = info->stripe_layout & VIA_L_DISKS;
               aai->aai_capacity = aai->aai_width * info->disk_sectors;
               break;

       case VIA_T_RAID1:
               aai->aai_level = AAI_L_RAID1;
               aai->aai_width = 1;
               aai->aai_capacity = aai->aai_width * info->disk_sectors;
               break;

       case VIA_T_RAID5:
               aai->aai_level = AAI_L_RAID5;
               aai->aai_width = info->stripe_layout & VIA_L_DISKS;
               aai->aai_capacity = (aai->aai_width - 1) * info->disk_sectors;
               break;

       case VIA_T_SPAN:
               aai->aai_level = AAI_L_SPAN;
               aai->aai_width = 1;
               aai->aai_capacity += info->disk_sectors; /* XXX ??? */
               break;

       default:
               aprint_error_dev(dksc->sc_dev,
                   "unknown VIA V-RAID type 0x%02x\n", info->type);
               error = EINVAL;
               goto out;
       }

       aai->aai_type = ATA_RAID_TYPE_VIA;
       /*
        * VIA V-RAID supports up to four drives in RAID 0 and JBOD
        * configurations and up to two drives in a RAID 1 configuration.
        */
       for (count = 0, disk = 0; disk < 4; disk++)
               if (info->disks[disk])
                       count++;
       aai->aai_interleave =
               0x08 << ((info->stripe_layout & VIA_L_MASK) >> VIA_L_SHIFT);
       aai->aai_ndisks = count;
       aai->aai_heads = 255;
       aai->aai_sectors = 63;
       aai->aai_cylinders = aai->aai_capacity / (63 * 255);
       aai->aai_offset = 0;
       aai->aai_reserved = 1;

       /* XXX - bogus.  RAID1 shouldn't really have an interleave */
       if (aai->aai_interleave == 0)
               aai->aai_interleave = aai->aai_capacity;

       /*
        * VIA V-RAID configuration blocks store the disk index as a value
        * incrementing by 0x04 (0x00, 0x04, 0x08, 0x0C).  Therefore, shift
        * the value left by 2 to obtain the disk number.
        */
       drive = info->disk_index >> 2;
       if (drive >= aai->aai_ndisks) {
               aprint_error_dev(dksc->sc_dev,
                   "drive number %d doesn't make sense within %d-disk "
                   "array\n", drive, aai->aai_ndisks);
               error = EINVAL;
               goto out;
       }

       adi = &aai->aai_disks[drive];
       adi->adi_dev = dksc->sc_dev;
       adi->adi_status = ADI_S_ONLINE | ADI_S_ASSIGNED;
       adi->adi_sectors = aai->aai_capacity;
       adi->adi_compsize = info->disk_sectors;

       error = 0;

out:
       kmem_free(info, sizeof(*info));
       return (error);
}

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