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freebsd/sys/dev/ata/atapi-all.c
Søren Schmidt bb5bdd386e First round off updates/fixes to the ATA driver.
This moves all chipset specific code to a new file 'ata-chipset.c'.
Extensive use of tables and pointers to avoid having the same switch
on chipset type in several places, and to allow substituting various
functions for different HW arch needs.
Added PIO mode setup and all DMA modes.
Support for all known SiS chipsets. Thanks to Christoph Kukulies for
sponsoring a nice ASUS P4S8X SiS648 based board for this work!

Tested on:	i386, PC98, alpha and sparc64
2003-02-20 20:02:32 +00:00

701 lines
20 KiB
C

/*-
* Copyright (c) 1998 - 2003 Søren Schmidt <sos@FreeBSD.org>
* 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.
*
* $FreeBSD$
*/
#include "opt_ata.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ata.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#include <sys/bio.h>
#include <sys/sysctl.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <dev/ata/ata-all.h>
#include <dev/ata/atapi-all.h>
/* prototypes */
static void atapi_read(struct atapi_request *, int);
static void atapi_write(struct atapi_request *, int);
static void atapi_finish(struct atapi_request *);
static void atapi_timeout(struct atapi_request *);
static char *atapi_cmd2str(u_int8_t);
static char *atapi_skey2str(u_int8_t);
/* misc defines */
#define ATAPI_MAX_RETRIES 3
/* internal vars */
static int atapi_dma = 0;
TUNABLE_INT("hw.ata.atapi_dma", &atapi_dma);
static MALLOC_DEFINE(M_ATAPI, "ATAPI generic", "ATAPI driver generic layer");
/* systcl vars */
SYSCTL_DECL(_hw_ata);
SYSCTL_INT(_hw_ata, OID_AUTO, atapi_dma, CTLFLAG_RD, &atapi_dma, 0,
"ATAPI device DMA mode control");
void
atapi_attach(struct ata_device *atadev)
{
if (bootverbose)
ata_prtdev(atadev, "piomode=%d dmamode=%d udmamode=%d dmaflag=%d\n",
ata_pmode(atadev->param), ata_wmode(atadev->param),
ata_umode(atadev->param), atadev->param->support_dma);
ATA_SLEEPLOCK_CH(atadev->channel, ATA_CONTROL);
if (atapi_dma && !(atadev->param->drq_type == ATAPI_DRQT_INTR))
atadev->setmode(atadev, ATA_DMA_MAX);
else
atadev->setmode(atadev, ATA_PIO_MAX);
ATA_UNLOCK_CH(atadev->channel);
if (!(atadev->result = malloc(sizeof(struct atapi_reqsense), M_ATAPI,
M_NOWAIT | M_ZERO)))
ata_prtdev(atadev, "no memory for sense data\n");
switch (atadev->param->type) {
#ifdef DEV_ATAPICD
case ATAPI_TYPE_CDROM:
if (acdattach(atadev))
return;
break;
#endif
#ifdef DEV_ATAPIFD
case ATAPI_TYPE_DIRECT:
if (afdattach(atadev))
return;
break;
#endif
#ifdef DEV_ATAPIST
case ATAPI_TYPE_TAPE:
if (astattach(atadev))
return;
break;
#endif
}
#ifndef DEV_ATAPICAM
ata_prtdev(atadev, "<%.40s/%.8s> - NO DRIVER!\n",
atadev->param->model, atadev->param->revision);
free(atadev->result, M_ATAPI);
atadev->driver = NULL;
#endif
}
void
atapi_detach(struct ata_device *atadev)
{
struct atapi_request *request;
atadev->flags |= ATA_D_DETACHING;
ata_prtdev(atadev, "removed from configuration\n");
switch (atadev->param->type) {
#ifdef DEV_ATAPICD
case ATAPI_TYPE_CDROM:
acddetach(atadev);
break;
#endif
#ifdef DEV_ATAPIFD
case ATAPI_TYPE_DIRECT:
afddetach(atadev);
break;
#endif
#ifdef DEV_ATAPIST
case ATAPI_TYPE_TAPE:
astdetach(atadev);
break;
#endif
default:
return;
}
TAILQ_FOREACH(request, &atadev->channel->atapi_queue, chain) {
if (request->device != atadev)
continue;
TAILQ_REMOVE(&atadev->channel->atapi_queue, request, chain);
if (request->driver) {
struct bio *bp = (struct bio *) request->driver;
biofinish(bp, NULL, ENXIO);
}
free(request, M_ATAPI);
}
atadev->channel->dma->free(atadev);
free(atadev->result, M_ATAPI);
atadev->driver = NULL;
atadev->flags = 0;
}
int
atapi_queue_cmd(struct ata_device *atadev, int8_t *ccb, caddr_t data,
int count, int flags, int timeout,
atapi_callback_t callback, void *driver)
{
struct atapi_request *request;
int error, s;
if (!(request = malloc(sizeof(struct atapi_request), M_ATAPI,
M_NOWAIT | M_ZERO)))
return ENOMEM;
request->device = atadev;
request->data = data;
request->bytecount = count;
request->flags = flags;
request->error = EINPROGRESS;
request->timeout = timeout * hz;
request->ccbsize = atadev->param->packet_size ? 16 : 12;
bcopy(ccb, request->ccb, request->ccbsize);
if (callback) {
request->callback = callback;
request->driver = driver;
}
if (atadev->mode >= ATA_DMA) {
if (atadev->channel->dma->alloc(atadev))
atadev->mode = ATA_PIO;
}
#ifdef ATAPI_DEBUG
ata_prtdev(atadev, "queueing %s ", atapi_cmd2str(request->ccb[0]));
atapi_dump("ccb = ", &request->ccb[0], sizeof(request->ccb));
#endif
/* append onto controller queue and try to start controller */
s = splbio();
if (flags & ATPR_F_AT_HEAD)
TAILQ_INSERT_HEAD(&atadev->channel->atapi_queue, request, chain);
else
TAILQ_INSERT_TAIL(&atadev->channel->atapi_queue, request, chain);
ata_start(atadev->channel);
/* if callback used, then just return, gets called from interrupt context */
if (callback) {
splx(s);
return 0;
}
/* only sleep when command is in progress */
if (request->error == EINPROGRESS)
tsleep((caddr_t)request, PRIBIO, "atprq", 0);
splx(s);
error = request->error;
if (error)
bcopy(&request->sense, atadev->result, sizeof(struct atapi_reqsense));
free(request, M_ATAPI);
return error;
}
void
atapi_start(struct ata_device *atadev)
{
switch (atadev->param->type) {
#ifdef DEV_ATAPICD
case ATAPI_TYPE_CDROM:
acd_start(atadev);
break;
#endif
#ifdef DEV_ATAPIFD
case ATAPI_TYPE_DIRECT:
afd_start(atadev);
break;
#endif
#ifdef DEV_ATAPIST
case ATAPI_TYPE_TAPE:
ast_start(atadev);
break;
#endif
default:
return;
}
}
int
atapi_transfer(struct atapi_request *request)
{
struct ata_device *atadev = request->device;
int timout;
u_int8_t reason;
#ifdef ATAPI_DEBUG
ata_prtdev(atadev, "starting %s ", atapi_cmd2str(request->ccb[0]));
atapi_dump("ccb = ", &request->ccb[0], sizeof(request->ccb));
#endif
/* is this just a POLL DSC command ? */
if (request->ccb[0] == ATAPI_POLL_DSC) {
ATA_OUTB(atadev->channel->r_io, ATA_DRIVE, ATA_D_IBM | atadev->unit);
DELAY(10);
if (ATA_INB(atadev->channel->r_altio, ATA_ALTSTAT) & ATA_S_DSC)
request->error = 0;
else
request->error = EBUSY;
atapi_finish(request);
return ATA_OP_FINISHED;
}
/* start timeout for this command */
request->timeout_handle = timeout((timeout_t *)atapi_timeout,
request, request->timeout);
if (!(request->flags & ATPR_F_INTERNAL))
atadev->cmd = request->ccb[0];
/* if DMA enabled setup DMA hardware */
request->flags &= ~ATPR_F_DMA_USED;
if ((atadev->mode >= ATA_DMA) &&
(request->ccb[0] == ATAPI_READ ||
request->ccb[0] == ATAPI_READ_BIG ||
request->ccb[0] == ATAPI_READ_CD ||
((request->ccb[0] == ATAPI_WRITE ||
request->ccb[0] == ATAPI_WRITE_BIG) &&
!(atadev->channel->flags & ATA_ATAPI_DMA_RO))) &&
!atadev->channel->dma->setup(atadev, (void *)request->data, request->bytecount)) {
request->flags |= ATPR_F_DMA_USED;
}
/* start ATAPI operation */
if (ata_command(atadev, ATA_C_PACKET_CMD,
min(request->bytecount, 65534) << 8, 0,
(request->flags & ATPR_F_DMA_USED) ? ATA_F_DMA : 0,
ATA_IMMEDIATE))
ata_prtdev(atadev, "failure to send ATAPI packet command\n");
if (request->flags & ATPR_F_DMA_USED)
atadev->channel->dma->start(atadev, request->data, request->bytecount,
request->flags & ATPR_F_READ);
/* command interrupt device ? just return */
if (atadev->param->drq_type == ATAPI_DRQT_INTR)
return ATA_OP_CONTINUES;
/* ready to write ATAPI command */
timout = 5000; /* might be less for fast devices */
while (timout--) {
reason = ATA_INB(atadev->channel->r_io, ATA_IREASON);
atadev->channel->status = ATA_INB(atadev->channel->r_io, ATA_STATUS);
if (((reason & (ATA_I_CMD | ATA_I_IN)) |
(atadev->channel->status&(ATA_S_DRQ|ATA_S_BUSY)))==ATAPI_P_CMDOUT)
break;
DELAY(20);
}
if (timout <= 0) {
ata_prtdev(atadev, "failure to execute ATAPI packet command\n");
untimeout((timeout_t *)atapi_timeout, request, request->timeout_handle);
request->error = EIO;
atapi_finish(request);
return ATA_OP_FINISHED;
}
/* this seems to be needed for some (slow) devices */
DELAY(10);
/* send actual command */
ATA_OUTSW_STRM(atadev->channel->r_io, ATA_DATA, (int16_t *)request->ccb,
request->ccbsize / sizeof(int16_t));
return ATA_OP_CONTINUES;
}
int
atapi_interrupt(struct atapi_request *request)
{
struct ata_device *atadev = request->device;
int reason, dma_stat = 0;
reason = (ATA_INB(atadev->channel->r_io, ATA_IREASON)&(ATA_I_CMD|ATA_I_IN))|
(atadev->channel->status & ATA_S_DRQ);
if (reason == ATAPI_P_CMDOUT) {
if (!(atadev->channel->status & ATA_S_DRQ)) {
ata_prtdev(atadev, "command interrupt without DRQ\n");
untimeout((timeout_t *)atapi_timeout,
request, request->timeout_handle);
request->error = EIO;
atapi_finish(request);
return ATA_OP_FINISHED;
}
ATA_OUTSW_STRM(atadev->channel->r_io, ATA_DATA, (int16_t *)request->ccb,
request->ccbsize / sizeof(int16_t));
return ATA_OP_CONTINUES;
}
if (request->flags & ATPR_F_DMA_USED) {
dma_stat = atadev->channel->dma->stop(atadev);
if ((atadev->channel->status & (ATA_S_ERROR | ATA_S_DWF)) ||
dma_stat & ATA_BMSTAT_ERROR) {
request->result = ATA_INB(atadev->channel->r_io, ATA_ERROR);
}
else {
request->result = 0;
request->donecount = request->bytecount;
request->bytecount = 0;
}
}
else {
int length = ATA_INB(atadev->channel->r_io, ATA_CYL_LSB) |
ATA_INB(atadev->channel->r_io, ATA_CYL_MSB) << 8;
switch (reason) {
case ATAPI_P_WRITE:
if (request->flags & ATPR_F_READ) {
request->result = ATA_INB(atadev->channel->r_io, ATA_ERROR);
ata_prtdev(atadev, "%s trying to write on read buffer\n",
atapi_cmd2str(atadev->cmd));
break;
}
atapi_write(request, length);
return ATA_OP_CONTINUES;
case ATAPI_P_READ:
if (!(request->flags & ATPR_F_READ)) {
request->result = ATA_INB(atadev->channel->r_io, ATA_ERROR);
ata_prtdev(atadev, "%s trying to read on write buffer\n",
atapi_cmd2str(atadev->cmd));
break;
}
atapi_read(request, length);
return ATA_OP_CONTINUES;
case ATAPI_P_DONEDRQ:
ata_prtdev(atadev, "%s DONEDRQ\n", atapi_cmd2str(atadev->cmd));
if (request->flags & ATPR_F_READ)
atapi_read(request, length);
else
atapi_write(request, length);
/* FALLTHROUGH */
case ATAPI_P_ABORT:
case ATAPI_P_DONE:
if (atadev->channel->status & (ATA_S_ERROR | ATA_S_DWF))
request->result = ATA_INB(atadev->channel->r_io, ATA_ERROR);
else
if (!(request->flags & ATPR_F_INTERNAL))
request->result = 0;
break;
default:
ata_prtdev(atadev, "unknown transfer phase %d\n", reason);
}
}
untimeout((timeout_t *)atapi_timeout, request, request->timeout_handle);
/* check for error, if valid sense key, queue a request sense cmd */
if ((request->result & ATAPI_SK_MASK) &&
request->ccb[0] != ATAPI_REQUEST_SENSE) {
bzero(request->ccb, request->ccbsize);
request->ccb[0] = ATAPI_REQUEST_SENSE;
request->ccb[4] = sizeof(struct atapi_reqsense);
request->bytecount = sizeof(struct atapi_reqsense);
request->flags &= ATPR_F_QUIET;
request->flags |= ATPR_F_READ | ATPR_F_INTERNAL;
TAILQ_INSERT_HEAD(&atadev->channel->atapi_queue, request, chain);
}
else {
if (request->result) {
switch ((request->result & ATAPI_SK_MASK)) {
case ATAPI_SK_NO_SENSE:
request->error = 0;
break;
case ATAPI_SK_RECOVERED_ERROR:
ata_prtdev(atadev, "%s - recovered error\n",
atapi_cmd2str(atadev->cmd));
request->error = 0;
break;
case ATAPI_SK_NOT_READY:
request->error = EBUSY;
break;
case ATAPI_SK_UNIT_ATTENTION:
atadev->flags |= ATA_D_MEDIA_CHANGED;
request->error = EIO;
break;
default:
request->error = EIO;
if (request->flags & ATPR_F_QUIET)
break;
ata_prtdev(atadev, "%s - %s asc=0x%02x ascq=0x%02x ",
atapi_cmd2str(atadev->cmd),
atapi_skey2str(request->sense.sense_key),
request->sense.asc, request->sense.ascq);
if (request->sense.sksv)
printf("sks=0x%02x 0x%02x 0x%02x ",
request->sense.sk_specific,
request->sense.sk_specific1,
request->sense.sk_specific2);
printf("error=0x%02x\n", request->result & ATAPI_E_MASK);
}
}
else
request->error = 0;
atapi_finish(request);
}
return ATA_OP_FINISHED;
}
void
atapi_reinit(struct ata_device *atadev)
{
/* reinit device parameters */
atadev->setmode(atadev, atadev->mode);
}
int
atapi_test_ready(struct ata_device *atadev)
{
int8_t ccb[16] = { ATAPI_TEST_UNIT_READY, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
return atapi_queue_cmd(atadev, ccb, NULL, 0, 0, 30, NULL, NULL);
}
int
atapi_wait_dsc(struct ata_device *atadev, int timeout)
{
int error = 0;
int8_t ccb[16] = { ATAPI_POLL_DSC, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
timeout *= hz;
while (timeout > 0) {
error = atapi_queue_cmd(atadev, ccb, NULL, 0, 0, 0, NULL, NULL);
if (error != EBUSY)
break;
tsleep((caddr_t)&error, PRIBIO, "atpwt", hz / 2);
timeout -= (hz / 2);
}
return error;
}
void
atapi_dump(char *label, void *data, int len)
{
u_int8_t *p = data;
printf("%s %02x", label, *p++);
while (--len > 0)
printf ("-%02x", *p++);
printf("\n");
}
static void
atapi_read(struct atapi_request *request, int length)
{
int8_t **buffer = (int8_t **)&request->data;
int size = min(request->bytecount, length);
struct ata_channel *ch = request->device->channel;
int resid;
if (request->flags & ATPR_F_INTERNAL)
*buffer = (int8_t *)&request->sense;
if (ch->flags & ATA_USE_16BIT || (size % sizeof(int32_t)))
ATA_INSW_STRM(ch->r_io, ATA_DATA, (void *)((uintptr_t)*buffer),
size / sizeof(int16_t));
else
ATA_INSL_STRM(ch->r_io, ATA_DATA, (void *)((uintptr_t)*buffer),
size / sizeof(int32_t));
if (request->bytecount < length) {
ata_prtdev(request->device, "read data overrun %d/%d\n",
length, request->bytecount);
for (resid=request->bytecount; resid<length; resid+=sizeof(int16_t))
ATA_INW(ch->r_io, ATA_DATA);
}
*buffer += size;
request->bytecount -= size;
request->donecount += size;
}
static void
atapi_write(struct atapi_request *request, int length)
{
int8_t **buffer = (int8_t **)&request->data;
int size = min(request->bytecount, length);
struct ata_channel *ch = request->device->channel;
int resid;
if (request->flags & ATPR_F_INTERNAL)
*buffer = (int8_t *)&request->sense;
if (ch->flags & ATA_USE_16BIT || (size % sizeof(int32_t)))
ATA_OUTSW_STRM(ch->r_io, ATA_DATA, (void *)((uintptr_t)*buffer),
size / sizeof(int16_t));
else
ATA_OUTSL_STRM(ch->r_io, ATA_DATA, (void *)((uintptr_t)*buffer),
size / sizeof(int32_t));
if (request->bytecount < length) {
ata_prtdev(request->device, "write data underrun %d/%d\n",
length, request->bytecount);
for (resid=request->bytecount; resid<length; resid+=sizeof(int16_t))
ATA_OUTW(ch->r_io, ATA_DATA, 0);
}
*buffer += size;
request->bytecount -= size;
request->donecount += size;
}
static void
atapi_finish(struct atapi_request *request)
{
#ifdef ATAPI_DEBUG
ata_prtdev(request->device, "finished %s%s\n",
request->callback ? "callback " : "",
atapi_cmd2str(request->ccb[0]));
#endif
if (request->callback) {
if (!((request->callback)(request)))
free(request, M_ATAPI);
}
else
wakeup((caddr_t)request);
}
static void
atapi_timeout(struct atapi_request *request)
{
struct ata_device *atadev = request->device;
atadev->channel->running = NULL;
ata_prtdev(atadev, "%s command timeout - resetting\n",
atapi_cmd2str(request->ccb[0]));
if (request->flags & ATPR_F_DMA_USED) {
atadev->channel->dma->stop(atadev);
if (request->retries == ATAPI_MAX_RETRIES) {
atadev->setmode(atadev, ATA_PIO_MAX);
ata_prtdev(atadev, "trying fallback to PIO mode\n");
request->retries = 0;
}
}
/* if retries still permit, reinject this request */
if (request->retries++ < ATAPI_MAX_RETRIES) {
int s = splbio();
TAILQ_INSERT_HEAD(&atadev->channel->atapi_queue, request, chain);
splx(s);
}
else {
/* retries all used up, return error */
request->error = EIO;
wakeup((caddr_t)request);
}
ata_reinit(atadev->channel);
}
static char *
atapi_cmd2str(u_int8_t cmd)
{
switch (cmd) {
case 0x00: return ("TEST_UNIT_READY");
case 0x01: return ("REZERO");
case 0x03: return ("REQUEST_SENSE");
case 0x04: return ("FORMAT_UNIT");
case 0x08: return ("READ");
case 0x0a: return ("WRITE");
case 0x10: return ("WEOF");
case 0x11: return ("SPACE");
case 0x15: return ("MODE_SELECT");
case 0x19: return ("ERASE");
case 0x1a: return ("MODE_SENSE");
case 0x1b: return ("START_STOP");
case 0x1e: return ("PREVENT_ALLOW");
case 0x23: return ("ATAPI_READ_FORMAT_CAPACITIES");
case 0x25: return ("READ_CAPACITY");
case 0x28: return ("READ_BIG");
case 0x2a: return ("WRITE_BIG");
case 0x2b: return ("LOCATE");
case 0x34: return ("READ_POSITION");
case 0x35: return ("SYNCHRONIZE_CACHE");
case 0x3b: return ("WRITE_BUFFER");
case 0x3c: return ("READ_BUFFER");
case 0x42: return ("READ_SUBCHANNEL");
case 0x43: return ("READ_TOC");
case 0x45: return ("PLAY_10");
case 0x47: return ("PLAY_MSF");
case 0x48: return ("PLAY_TRACK");
case 0x4b: return ("PAUSE");
case 0x51: return ("READ_DISK_INFO");
case 0x52: return ("READ_TRACK_INFO");
case 0x53: return ("RESERVE_TRACK");
case 0x54: return ("SEND_OPC_INFO");
case 0x55: return ("MODE_SELECT_BIG");
case 0x58: return ("REPAIR_TRACK");
case 0x59: return ("READ_MASTER_CUE");
case 0x5a: return ("MODE_SENSE_BIG");
case 0x5b: return ("CLOSE_TRACK/SESSION");
case 0x5c: return ("READ_BUFFER_CAPACITY");
case 0x5d: return ("SEND_CUE_SHEET");
case 0xa1: return ("BLANK_CMD");
case 0xa3: return ("SEND_KEY");
case 0xa4: return ("REPORT_KEY");
case 0xa5: return ("PLAY_12");
case 0xa6: return ("LOAD_UNLOAD");
case 0xad: return ("READ_DVD_STRUCTURE");
case 0xb4: return ("PLAY_CD");
case 0xbb: return ("SET_SPEED");
case 0xbd: return ("MECH_STATUS");
case 0xbe: return ("READ_CD");
case 0xff: return ("POLL_DSC");
default: {
static char buffer[20];
sprintf(buffer, "unknown CMD (0x%02x)", cmd);
return buffer;
}
}
}
static char *
atapi_skey2str(u_int8_t skey)
{
switch (skey) {
case 0x00: return ("NO SENSE");
case 0x01: return ("RECOVERED ERROR");
case 0x02: return ("NOT READY");
case 0x03: return ("MEDIUM ERROR");
case 0x04: return ("HARDWARE ERROR");
case 0x05: return ("ILLEGAL REQUEST");
case 0x06: return ("UNIT ATTENTION");
case 0x07: return ("DATA PROTECT");
case 0x08: return ("BLANK CHECK");
case 0x09: return ("VENDOR SPECIFIC");
case 0x0a: return ("COPY ABORTED");
case 0x0b: return ("ABORTED COMMAND");
case 0x0c: return ("EQUAL");
case 0x0d: return ("VOLUME OVERFLOW");
case 0x0e: return ("MISCOMPARE");
case 0x0f: return ("RESERVED");
default: return("UNKNOWN");
}
}