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freebsd-nq/sys/dev/ata/atapi-all.c
Poul-Henning Kamp 024cb40078 Fix an indentation problem.
2002-09-28 17:34:31 +00:00

721 lines
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/*-
* Copyright (c) 1998,1999,2000,2001,2002 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)) {
ata_dmainit(atadev,
(ata_pmode(atadev->param) < 0) ?
(atadev->param->support_dma ? 4:0):ata_pmode(atadev->param),
(ata_wmode(atadev->param) < 0) ?
(atadev->param->support_dma ? 2:0):ata_wmode(atadev->param),
ata_umode(atadev->param));
}
else
ata_dmainit(atadev,
ata_pmode(atadev->param) < 0 ? 0 : ata_pmode(atadev->param),
-1, -1);
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);
}
ata_dmafree(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 (ata_dmaalloc(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))) &&
!ata_dmasetup(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)
ata_dmastart(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 = ata_dmadone(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 */
if (atadev->mode >= ATA_DMA)
ata_dmainit(atadev,
(ata_pmode(atadev->param) < 0) ?
(atadev->param->support_dma ? 4:0):ata_pmode(atadev->param),
(ata_wmode(atadev->param) < 0) ?
(atadev->param->support_dma ? 2:0):ata_wmode(atadev->param),
ata_umode(atadev->param));
else
ata_dmainit(atadev,
ata_pmode(atadev->param)<0 ? 0 : ata_pmode(atadev->param),
-1, -1);
}
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) {
ata_dmadone(atadev);
if (request->retries == ATAPI_MAX_RETRIES) {
ata_dmainit(atadev,
(ata_pmode(atadev->param) < 0) ? 0 :
ata_pmode(atadev->param), -1, -1);
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");
}
}
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