/*      $NetBSD: ata_raid_jmicron.c,v 1.9 2023/08/01 07:58:41 mrg Exp $ */

/*-
* Copyright (c) 2000-2008 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 JMicron Technology RAID controller configuration blocks.
*
* Adapted to NetBSD by Juan Romero Pardines ([email protected]).
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ata_raid_jmicron.c,v 1.9 2023/08/01 07:58:41 mrg 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_jmicron_type(int type)
{
       static char buffer[16];

       switch (type) {
       case JM_T_RAID0:
               return "RAID0";
       case JM_T_RAID1:
               return "RAID1";
       case JM_T_RAID01:
               return "RAID0+1";
       case JM_T_RAID5:
               return "RAID5";
       case JM_T_JBOD:
               return "JBOD";
       default:
               snprintf(buffer, sizeof(buffer), "UNKNOWN 0x%02x", type);
               return buffer;
       }
}

static void
ata_raid_jmicron_print_info(struct jmicron_raid_conf *info)
{
       int i;

       printf("****** ATA JMicron Technology Corp Metadata ******\n");
       printf("signature           %.2s\n",    info->signature);
       printf("version             0x%04x\n",  info->version);
       printf("checksum            0x%04x\n",  info->checksum);
       printf("disk_id             0x%08x\n",  info->disk_id);
       printf("offset              0x%08x\n",  info->offset);
       printf("disk_sectors_low    0x%08x\n",  info->disk_sectors_low);
       printf("disk_sectors_high   0x%08x\n",  info->disk_sectors_high);
       printf("name                %.16s\n",   info->name);
       printf("type                %s\n",
           ata_raid_jmicron_type(info->type));
       printf("stripe_shift        %d\n",      info->stripe_shift);
       printf("flags               0x%04x\n",  info->flags);
       printf("spare:\n");
       for (i = 0; i < 2 && info->spare[i]; i++)
               printf("    %d                  0x%08x\n", i, info->spare[i]);
       printf("disks:\n");
       for (i = 0; i < 8 && info->disks[i]; i++)
               printf("    %d                  0x%08x\n", i, info->disks[i]);
       printf("=================================================\n");
}
#endif

int
ata_raid_read_config_jmicron(struct wd_softc *sc)
{
       struct dk_softc *dksc = &sc->sc_dksc;
       struct atabus_softc *atabus;
       struct jmicron_raid_conf *info;
       struct vnode *vp;
       struct ataraid_array_info *aai;
       struct ataraid_disk_info *adi;
       uint64_t disk_size;
       uint32_t drive;
       uint16_t checksum, *ptr;
       int bmajor, error, count, disk, total_disks;
       dev_t dev;

       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, JMICRON_LBA(sc), info,
           sizeof(*info), B_READ);
       VOP_CLOSE(vp, FREAD, NOCRED);
       vput(vp);
       if (error) {
               DPRINTF(("%s: error %d reading JMicron config block\n",
                   dksc->sc_xname, error));
               goto out;
       }

       /* Check for JMicron signature. */
       if (strncmp(info->signature, JMICRON_MAGIC, 2)) {
               DPRINTF(("%s: JMicron RAID signature check failed\n",
                   dksc->sc_xname));
               error = ESRCH;
               goto out;
       }

       /* calculate checksum and compare for valid */
       for (checksum = 0, ptr = (uint16_t *)info, count = 0;
            count < 64; count++)
               checksum += *ptr++;
       if (checksum) {
               DPRINTF(("%s: JMicron checksum failed\n",
                   dksc->sc_xname));
               error = ESRCH;
               goto out;
       }

#ifdef ATA_RAID_DEBUG
       ata_raid_jmicron_print_info(info);
#endif
       /*
        * Check that there aren't stale config blocks without
        * any array set configured.
        */
       for (total_disks = 0, disk = 0; disk < JM_MAX_DISKS; disk++)
               if (info->disks[disk] == info->disk_id)
                       total_disks++;
       if (total_disks <= 1) {
               error = EINVAL;
               goto out;
       }

       /*
        * Check volume's state and bail out if it's not acceptable.
        */
       if ((info->flags & (JM_F_READY|JM_F_BOOTABLE|JM_F_ACTIVE)) == 0) {
               error = EINVAL;
               goto out;
       }

       /*
        * Lookup or allocate a new array info structure for
        * this array.
        */
       aai = ata_raid_get_array_info(ATA_RAID_TYPE_JMICRON, 0);
       aai->aai_status = AAI_S_READY;

       switch (info->type) {
       case JM_T_RAID0:
               aai->aai_level = AAI_L_RAID0;
               aai->aai_width = total_disks;
               break;
       case JM_T_RAID1:
               aai->aai_level = AAI_L_RAID1;
               aai->aai_width = 1;
               break;
       case JM_T_RAID01:
               aai->aai_level = AAI_L_RAID0 | AAI_L_RAID1;
               aai->aai_width = total_disks / 2;
               break;
       case JM_T_JBOD:
               aai->aai_level = AAI_L_SPAN;
               aai->aai_width = total_disks;
               break;
       default:
               DPRINTF(("%s: unknown JMicron RAID type 0x%02x\n",
                   dksc->sc_xname, info->type));
               error = EINVAL;
               goto out;
       }

       disk_size = (info->disk_sectors_high << 16) + info->disk_sectors_low;
       aai->aai_type = ATA_RAID_TYPE_JMICRON;
       aai->aai_generation = 0;
       aai->aai_capacity = disk_size * aai->aai_width;
       aai->aai_interleave = 2 << info->stripe_shift;
       aai->aai_ndisks = total_disks;
       aai->aai_heads = 255;
       aai->aai_sectors = 63;
       aai->aai_cylinders =
           aai->aai_capacity / (aai->aai_heads * aai->aai_sectors);
       aai->aai_offset = info->offset * 16;
       aai->aai_reserved = 2;
       strlcpy(aai->aai_name, info->name, sizeof(aai->aai_name));

       atabus = device_private(device_parent(dksc->sc_dev));
       drive = atabus->sc_chan->ch_channel;
       if (drive >= aai->aai_ndisks) {
               DPRINTF(("%s: drive number %d doesn't make sense within "
                   "%d-disk array\n", dksc->sc_xname,
                   drive, aai->aai_ndisks));
               error = EINVAL;
               goto out;
       }

       if (info->disks[drive] == info->disk_id) {
               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 = disk_size - aai->aai_reserved;
       }

       error = 0;

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

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