2 * Copyright (c) 1998,1999,2000,2001,2002 Søren Schmidt <sos@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer,
10 * without modification, immediately at the beginning of the file.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 * $FreeBSD: src/sys/dev/ata/atapi-all.c,v 1.46.2.18 2002/10/31 23:10:33 thomas Exp $
29 * $DragonFly: src/sys/dev/disk/ata/atapi-all.c,v 1.2 2003/06/17 04:28:22 dillon Exp $
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/kernel.h>
42 #include <sys/malloc.h>
44 #include <sys/sysctl.h>
45 #include <machine/bus.h>
46 #include <machine/clock.h>
48 #include <dev/ata/ata-all.h>
49 #include <dev/ata/atapi-all.h>
52 static void atapi_read(struct atapi_request *, int);
53 static void atapi_write(struct atapi_request *, int);
54 static void atapi_finish(struct atapi_request *);
55 static void atapi_timeout(struct atapi_request *);
56 static char *atapi_cmd2str(u_int8_t);
57 static char *atapi_skey2str(u_int8_t);
60 #define ATAPI_MAX_RETRIES 3
63 static int atapi_dma = 0;
64 TUNABLE_INT("hw.ata.atapi_dma", &atapi_dma);
65 static MALLOC_DEFINE(M_ATAPI, "ATAPI generic", "ATAPI driver generic layer");
69 SYSCTL_INT(_hw_ata, OID_AUTO, atapi_dma, CTLFLAG_RD, &atapi_dma, 0,
70 "ATAPI device DMA mode control");
73 atapi_attach(struct ata_device *atadev)
76 ata_prtdev(atadev, "piomode=%d dmamode=%d udmamode=%d dmaflag=%d\n",
77 ata_pmode(atadev->param), ata_wmode(atadev->param),
78 ata_umode(atadev->param), atadev->param->support_dma);
80 ATA_SLEEPLOCK_CH(atadev->channel, ATA_CONTROL);
81 if (atapi_dma && !(atadev->param->drq_type == ATAPI_DRQT_INTR)) {
82 ata_dmainit(atadev->channel, atadev->unit,
83 (ata_pmode(atadev->param) < 0) ?
84 (atadev->param->support_dma ? 4:0):ata_pmode(atadev->param),
85 (ata_wmode(atadev->param) < 0) ?
86 (atadev->param->support_dma ? 2:0):ata_wmode(atadev->param),
87 ata_umode(atadev->param));
90 ata_dmainit(atadev->channel, atadev->unit,
91 ata_pmode(atadev->param) < 0 ? 0 : ata_pmode(atadev->param),
93 ATA_UNLOCK_CH(atadev->channel);
95 if (!(atadev->result = malloc(sizeof(struct atapi_reqsense), M_ATAPI,
97 ata_prtdev(atadev, "no memory for sense data\n");
99 switch (atadev->param->type) {
101 case ATAPI_TYPE_CDROM:
102 if (acdattach(atadev))
107 case ATAPI_TYPE_DIRECT:
108 if (afdattach(atadev))
113 case ATAPI_TYPE_TAPE:
114 if (astattach(atadev))
120 ata_prtdev(atadev, "<%.40s/%.8s> - NO DRIVER!\n",
121 atadev->param->model, atadev->param->revision);
122 free(atadev->result, M_ATAPI);
123 atadev->driver = NULL;
128 atapi_detach(struct ata_device *atadev)
130 struct atapi_request *request;
132 atadev->flags |= ATA_D_DETACHING;
133 ata_prtdev(atadev, "removed from configuration\n");
134 switch (atadev->param->type) {
136 case ATAPI_TYPE_CDROM:
141 case ATAPI_TYPE_DIRECT:
146 case ATAPI_TYPE_TAPE:
153 TAILQ_FOREACH(request, &atadev->channel->atapi_queue, chain) {
154 if (request->device != atadev)
156 TAILQ_REMOVE(&atadev->channel->atapi_queue, request, chain);
157 if (request->driver) {
158 struct buf *bp = (struct buf *) request->driver;
159 bp->b_flags |= B_ERROR;
164 free(request->dmatab, M_DEVBUF);
165 free(request, M_ATAPI);
167 free(atadev->result, M_ATAPI);
168 atadev->driver = NULL;
174 atapi_queue_cmd(struct ata_device *atadev, int8_t *ccb, caddr_t data,
175 int count, int flags, int timeout,
176 atapi_callback_t callback, void *driver)
178 struct atapi_request *request;
181 if (!(request = malloc(sizeof(struct atapi_request), M_ATAPI,
185 request->device = atadev;
186 request->data = data;
187 request->bytecount = count;
188 request->flags = flags;
189 request->error = EINPROGRESS;
190 request->timeout = timeout * hz;
191 request->ccbsize = atadev->param->packet_size ? 16 : 12;
192 bcopy(ccb, request->ccb, request->ccbsize);
194 request->callback = callback;
195 request->driver = driver;
197 if (atadev->mode >= ATA_DMA) {
198 if (!(request->dmatab = ata_dmaalloc(atadev->channel, atadev->unit)))
199 atadev->mode = ATA_PIO;
203 ata_prtdev(atadev, "queueing %s ", atapi_cmd2str(request->ccb[0]));
204 atapi_dump("ccb = ", &request->ccb[0], sizeof(request->ccb));
206 /* append onto controller queue and try to start controller */
208 if (flags & ATPR_F_AT_HEAD)
209 TAILQ_INSERT_HEAD(&atadev->channel->atapi_queue, request, chain);
211 TAILQ_INSERT_TAIL(&atadev->channel->atapi_queue, request, chain);
212 ata_start(atadev->channel);
214 /* if callback used, then just return, gets called from interrupt context */
220 /* only sleep when command is in progress */
221 if (request->error == EINPROGRESS)
222 tsleep((caddr_t)request, PRIBIO, "atprq", 0);
224 error = request->error;
226 bcopy(&request->sense, atadev->result, sizeof(struct atapi_reqsense));
228 free(request->dmatab, M_DEVBUF);
229 free(request, M_ATAPI);
234 atapi_start(struct ata_device *atadev)
236 switch (atadev->param->type) {
238 case ATAPI_TYPE_CDROM:
243 case ATAPI_TYPE_DIRECT:
248 case ATAPI_TYPE_TAPE:
258 atapi_transfer(struct atapi_request *request)
260 struct ata_device *atadev = request->device;
265 ata_prtdev(atadev, "starting %s ", atapi_cmd2str(request->ccb[0]));
266 atapi_dump("ccb = ", &request->ccb[0], sizeof(request->ccb));
268 /* is this just a POLL DSC command ? */
269 if (request->ccb[0] == ATAPI_POLL_DSC) {
270 ATA_OUTB(atadev->channel->r_io, ATA_DRIVE, ATA_D_IBM | atadev->unit);
272 if (ATA_INB(atadev->channel->r_altio, ATA_ALTSTAT) & ATA_S_DSC)
275 request->error = EBUSY;
276 atapi_finish(request);
277 return ATA_OP_FINISHED;
280 /* start timeout for this command */
281 request->timeout_handle = timeout((timeout_t *)atapi_timeout,
282 request, request->timeout);
284 if (!(request->flags & ATPR_F_INTERNAL))
285 atadev->cmd = request->ccb[0];
287 /* if DMA enabled setup DMA hardware */
288 request->flags &= ~ATPR_F_DMA_USED;
289 if ((atadev->mode >= ATA_DMA) &&
290 (request->ccb[0] == ATAPI_READ ||
291 request->ccb[0] == ATAPI_READ_BIG ||
292 request->ccb[0] == ATAPI_READ_CD ||
293 ((request->ccb[0] == ATAPI_WRITE ||
294 request->ccb[0] == ATAPI_WRITE_BIG) &&
295 !(atadev->channel->flags & ATA_ATAPI_DMA_RO))) &&
296 !ata_dmasetup(atadev->channel, atadev->unit, request->dmatab,
297 (void *)request->data, request->bytecount)) {
298 request->flags |= ATPR_F_DMA_USED;
301 /* start ATAPI operation */
302 if (ata_command(atadev, ATA_C_PACKET_CMD,
303 min(request->bytecount, 65534) << 8, 0,
304 (request->flags & ATPR_F_DMA_USED) ? ATA_F_DMA : 0,
306 ata_prtdev(atadev, "failure to send ATAPI packet command\n");
308 if (request->flags & ATPR_F_DMA_USED)
309 ata_dmastart(atadev->channel, atadev->unit,
310 request->dmatab, request->flags & ATPR_F_READ);
312 /* command interrupt device ? just return */
313 if (atadev->param->drq_type == ATAPI_DRQT_INTR)
314 return ATA_OP_CONTINUES;
316 /* ready to write ATAPI command */
317 timout = 5000; /* might be less for fast devices */
319 reason = ATA_INB(atadev->channel->r_io, ATA_IREASON);
320 atadev->channel->status = ATA_INB(atadev->channel->r_io, ATA_STATUS);
321 if (((reason & (ATA_I_CMD | ATA_I_IN)) |
322 (atadev->channel->status&(ATA_S_DRQ|ATA_S_BUSY)))==ATAPI_P_CMDOUT)
327 ata_prtdev(atadev, "failure to execute ATAPI packet command\n");
328 untimeout((timeout_t *)atapi_timeout, request, request->timeout_handle);
329 request->error = EIO;
330 atapi_finish(request);
331 return ATA_OP_FINISHED;
334 /* this seems to be needed for some (slow) devices */
337 /* send actual command */
338 ATA_OUTSW(atadev->channel->r_io, ATA_DATA, (int16_t *)request->ccb,
339 request->ccbsize / sizeof(int16_t));
340 return ATA_OP_CONTINUES;
344 atapi_interrupt(struct atapi_request *request)
346 struct ata_device *atadev = request->device;
347 int reason, dma_stat = 0;
349 reason = (ATA_INB(atadev->channel->r_io, ATA_IREASON)&(ATA_I_CMD|ATA_I_IN))|
350 (atadev->channel->status & ATA_S_DRQ);
352 if (reason == ATAPI_P_CMDOUT) {
353 if (!(atadev->channel->status & ATA_S_DRQ)) {
354 ata_prtdev(atadev, "command interrupt without DRQ\n");
355 untimeout((timeout_t *)atapi_timeout,
356 request, request->timeout_handle);
357 request->error = EIO;
358 atapi_finish(request);
359 return ATA_OP_FINISHED;
361 ATA_OUTSW(atadev->channel->r_io, ATA_DATA, (int16_t *)request->ccb,
362 request->ccbsize / sizeof(int16_t));
363 return ATA_OP_CONTINUES;
366 if (request->flags & ATPR_F_DMA_USED) {
367 dma_stat = ata_dmadone(atadev->channel);
368 if ((atadev->channel->status & (ATA_S_ERROR | ATA_S_DWF)) ||
369 dma_stat & ATA_BMSTAT_ERROR) {
370 request->result = ATA_INB(atadev->channel->r_io, ATA_ERROR);
374 request->donecount = request->bytecount;
375 request->bytecount = 0;
379 int length = ATA_INB(atadev->channel->r_io, ATA_CYL_LSB) |
380 ATA_INB(atadev->channel->r_io, ATA_CYL_MSB) << 8;
384 if (request->flags & ATPR_F_READ) {
385 request->result = ATA_INB(atadev->channel->r_io, ATA_ERROR);
386 ata_prtdev(atadev, "%s trying to write on read buffer\n",
387 atapi_cmd2str(atadev->cmd));
390 atapi_write(request, length);
391 return ATA_OP_CONTINUES;
394 if (!(request->flags & ATPR_F_READ)) {
395 request->result = ATA_INB(atadev->channel->r_io, ATA_ERROR);
396 ata_prtdev(atadev, "%s trying to read on write buffer\n",
397 atapi_cmd2str(atadev->cmd));
400 atapi_read(request, length);
401 return ATA_OP_CONTINUES;
403 case ATAPI_P_DONEDRQ:
404 ata_prtdev(atadev, "%s DONEDRQ\n", atapi_cmd2str(atadev->cmd));
405 if (request->flags & ATPR_F_READ)
406 atapi_read(request, length);
408 atapi_write(request, length);
413 if (atadev->channel->status & (ATA_S_ERROR | ATA_S_DWF))
414 request->result = ATA_INB(atadev->channel->r_io, ATA_ERROR);
416 if (!(request->flags & ATPR_F_INTERNAL))
421 ata_prtdev(atadev, "unknown transfer phase %d\n", reason);
424 untimeout((timeout_t *)atapi_timeout, request, request->timeout_handle);
426 /* check for error, if valid sense key, queue a request sense cmd */
427 if ((request->result & ATAPI_SK_MASK) &&
428 request->ccb[0] != ATAPI_REQUEST_SENSE) {
429 bzero(request->ccb, request->ccbsize);
430 request->ccb[0] = ATAPI_REQUEST_SENSE;
431 request->ccb[4] = sizeof(struct atapi_reqsense);
432 request->bytecount = sizeof(struct atapi_reqsense);
433 request->flags &= ATPR_F_QUIET;
434 request->flags |= ATPR_F_READ | ATPR_F_INTERNAL;
435 TAILQ_INSERT_HEAD(&atadev->channel->atapi_queue, request, chain);
438 if (request->result) {
439 switch ((request->result & ATAPI_SK_MASK)) {
440 case ATAPI_SK_NO_SENSE:
444 case ATAPI_SK_RECOVERED_ERROR:
445 ata_prtdev(atadev, "%s - recovered error\n",
446 atapi_cmd2str(atadev->cmd));
450 case ATAPI_SK_NOT_READY:
451 request->error = EBUSY;
454 case ATAPI_SK_UNIT_ATTENTION:
455 atadev->flags |= ATA_D_MEDIA_CHANGED;
456 request->error = EIO;
460 request->error = EIO;
462 if (request->flags & ATPR_F_QUIET)
465 ata_prtdev(atadev, "%s - %s asc=0x%02x ascq=0x%02x ",
466 atapi_cmd2str(atadev->cmd),
467 atapi_skey2str(request->sense.sense_key),
468 request->sense.asc, request->sense.ascq);
469 if (request->sense.sksv)
470 printf("sks=0x%02x 0x%02x 0x%02x ",
471 request->sense.sk_specific,
472 request->sense.sk_specific1,
473 request->sense.sk_specific2);
474 printf("error=0x%02x\n", request->result & ATAPI_E_MASK);
479 atapi_finish(request);
481 return ATA_OP_FINISHED;
485 atapi_reinit(struct ata_device *atadev)
487 /* reinit device parameters */
488 if (atadev->mode >= ATA_DMA)
489 ata_dmainit(atadev->channel, atadev->unit,
490 (ata_pmode(atadev->param) < 0) ?
491 (atadev->param->support_dma ? 4:0):ata_pmode(atadev->param),
492 (ata_wmode(atadev->param) < 0) ?
493 (atadev->param->support_dma ? 2:0):ata_wmode(atadev->param),
494 ata_umode(atadev->param));
496 ata_dmainit(atadev->channel, atadev->unit,
497 ata_pmode(atadev->param)<0 ? 0 : ata_pmode(atadev->param),
502 atapi_test_ready(struct ata_device *atadev)
504 int8_t ccb[16] = { ATAPI_TEST_UNIT_READY, 0, 0, 0, 0,
505 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
507 return atapi_queue_cmd(atadev, ccb, NULL, 0, 0, 30, NULL, NULL);
511 atapi_wait_dsc(struct ata_device *atadev, int timeout)
514 int8_t ccb[16] = { ATAPI_POLL_DSC, 0, 0, 0, 0,
515 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
518 while (timeout > 0) {
519 error = atapi_queue_cmd(atadev, ccb, NULL, 0, 0, 0, NULL, NULL);
522 tsleep((caddr_t)&error, PRIBIO, "atpwt", hz / 2);
529 atapi_dump(char *label, void *data, int len)
533 printf("%s %02x", label, *p++);
535 printf ("-%02x", *p++);
540 atapi_read(struct atapi_request *request, int length)
542 int8_t **buffer = (int8_t **)&request->data;
543 int size = min(request->bytecount, length);
544 struct ata_channel *ch = request->device->channel;
547 if (request->flags & ATPR_F_INTERNAL)
548 *buffer = (int8_t *)&request->sense;
550 if (ch->flags & ATA_USE_16BIT || (size % sizeof(int32_t)))
551 ATA_INSW(ch->r_io, ATA_DATA, (void *)((uintptr_t)*buffer),
552 size / sizeof(int16_t));
554 ATA_INSL(ch->r_io, ATA_DATA, (void *)((uintptr_t)*buffer),
555 size / sizeof(int32_t));
557 if (request->bytecount < length) {
558 ata_prtdev(request->device, "read data overrun %d/%d\n",
559 length, request->bytecount);
560 for (resid=request->bytecount; resid<length; resid+=sizeof(int16_t))
561 ATA_INW(ch->r_io, ATA_DATA);
564 request->bytecount -= size;
565 request->donecount += size;
569 atapi_write(struct atapi_request *request, int length)
571 int8_t **buffer = (int8_t **)&request->data;
572 int size = min(request->bytecount, length);
573 struct ata_channel *ch = request->device->channel;
576 if (request->flags & ATPR_F_INTERNAL)
577 *buffer = (int8_t *)&request->sense;
579 if (ch->flags & ATA_USE_16BIT || (size % sizeof(int32_t)))
580 ATA_OUTSW(ch->r_io, ATA_DATA, (void *)((uintptr_t)*buffer),
581 size / sizeof(int16_t));
583 ATA_OUTSL(ch->r_io, ATA_DATA, (void *)((uintptr_t)*buffer),
584 size / sizeof(int32_t));
586 if (request->bytecount < length) {
587 ata_prtdev(request->device, "write data underrun %d/%d\n",
588 length, request->bytecount);
589 for (resid=request->bytecount; resid<length; resid+=sizeof(int16_t))
590 ATA_OUTW(ch->r_io, ATA_DATA, 0);
593 request->bytecount -= size;
594 request->donecount += size;
598 atapi_finish(struct atapi_request *request)
601 ata_prtdev(request->device, "finished %s%s\n",
602 request->callback ? "callback " : "",
603 atapi_cmd2str(request->ccb[0]));
605 if (request->callback) {
606 if (!((request->callback)(request))) {
608 free(request->dmatab, M_DEVBUF);
609 free(request, M_ATAPI);
613 wakeup((caddr_t)request);
617 atapi_timeout(struct atapi_request *request)
619 struct ata_device *atadev = request->device;
621 atadev->channel->running = NULL;
622 ata_prtdev(atadev, "%s command timeout - resetting\n",
623 atapi_cmd2str(request->ccb[0]));
625 if (request->flags & ATPR_F_DMA_USED) {
626 ata_dmadone(atadev->channel);
627 if (request->retries == ATAPI_MAX_RETRIES) {
628 ata_dmainit(atadev->channel, atadev->unit,
629 (ata_pmode(atadev->param) < 0) ? 0 :
630 ata_pmode(atadev->param), -1, -1);
631 ata_prtdev(atadev, "trying fallback to PIO mode\n");
632 request->retries = 0;
636 /* if retries still permit, reinject this request */
637 if (request->retries++ < ATAPI_MAX_RETRIES) {
638 TAILQ_INSERT_HEAD(&atadev->channel->atapi_queue, request, chain);
641 /* retries all used up, return error */
642 request->error = EIO;
643 wakeup((caddr_t)request);
645 ata_reinit(atadev->channel);
649 atapi_cmd2str(u_int8_t cmd)
652 case 0x00: return ("TEST_UNIT_READY");
653 case 0x01: return ("REZERO");
654 case 0x03: return ("REQUEST_SENSE");
655 case 0x04: return ("FORMAT_UNIT");
656 case 0x08: return ("READ");
657 case 0x0a: return ("WRITE");
658 case 0x10: return ("WEOF");
659 case 0x11: return ("SPACE");
660 case 0x15: return ("MODE_SELECT");
661 case 0x19: return ("ERASE");
662 case 0x1a: return ("MODE_SENSE");
663 case 0x1b: return ("START_STOP");
664 case 0x1e: return ("PREVENT_ALLOW");
665 case 0x25: return ("READ_CAPACITY");
666 case 0x28: return ("READ_BIG");
667 case 0x2a: return ("WRITE_BIG");
668 case 0x2b: return ("LOCATE");
669 case 0x34: return ("READ_POSITION");
670 case 0x35: return ("SYNCHRONIZE_CACHE");
671 case 0x3b: return ("WRITE_BUFFER");
672 case 0x3c: return ("READ_BUFFER");
673 case 0x42: return ("READ_SUBCHANNEL");
674 case 0x43: return ("READ_TOC");
675 case 0x45: return ("PLAY_10");
676 case 0x47: return ("PLAY_MSF");
677 case 0x48: return ("PLAY_TRACK");
678 case 0x4b: return ("PAUSE");
679 case 0x51: return ("READ_DISK_INFO");
680 case 0x52: return ("READ_TRACK_INFO");
681 case 0x53: return ("RESERVE_TRACK");
682 case 0x54: return ("SEND_OPC_INFO");
683 case 0x55: return ("MODE_SELECT_BIG");
684 case 0x58: return ("REPAIR_TRACK");
685 case 0x59: return ("READ_MASTER_CUE");
686 case 0x5a: return ("MODE_SENSE_BIG");
687 case 0x5b: return ("CLOSE_TRACK/SESSION");
688 case 0x5c: return ("READ_BUFFER_CAPACITY");
689 case 0x5d: return ("SEND_CUE_SHEET");
690 case 0xa1: return ("BLANK_CMD");
691 case 0xa3: return ("SEND_KEY");
692 case 0xa4: return ("REPORT_KEY");
693 case 0xa5: return ("PLAY_12");
694 case 0xa6: return ("LOAD_UNLOAD");
695 case 0xad: return ("READ_DVD_STRUCTURE");
696 case 0xb4: return ("PLAY_CD");
697 case 0xbb: return ("SET_SPEED");
698 case 0xbd: return ("MECH_STATUS");
699 case 0xbe: return ("READ_CD");
700 case 0xff: return ("POLL_DSC");
702 static char buffer[20];
703 sprintf(buffer, "unknown CMD (0x%02x)", cmd);
710 atapi_skey2str(u_int8_t skey)
713 case 0x00: return ("NO SENSE");
714 case 0x01: return ("RECOVERED ERROR");
715 case 0x02: return ("NOT READY");
716 case 0x03: return ("MEDIUM ERROR");
717 case 0x04: return ("HARDWARE ERROR");
718 case 0x05: return ("ILLEGAL REQUEST");
719 case 0x06: return ("UNIT ATTENTION");
720 case 0x07: return ("DATA PROTECT");
721 case 0x08: return ("BLANK CHECK");
722 case 0x09: return ("VENDOR SPECIFIC");
723 case 0x0a: return ("COPY ABORTED");
724 case 0x0b: return ("ABORTED COMMAND");
725 case 0x0c: return ("EQUAL");
726 case 0x0d: return ("VOLUME OVERFLOW");
727 case 0x0e: return ("MISCOMPARE");
728 case 0x0f: return ("RESERVED");
729 default: return("UNKNOWN");