2 * Copyright (c) 2001,2002 Thomas Quinot <thomas@cuivre.fr.eu.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-cam.c,v 1.10.2.3 2003/05/21 09:24:55 thomas Exp $
29 * $DragonFly: src/sys/dev/disk/ata/atapi-cam.c,v 1.15 2008/05/18 20:30:22 pavalos Exp $
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/devicestat.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
39 #include <sys/thread2.h>
41 #include <bus/cam/cam.h>
42 #include <bus/cam/cam_ccb.h>
43 #include <bus/cam/cam_periph.h>
44 #include <bus/cam/cam_sim.h>
45 #include <bus/cam/cam_xpt_sim.h>
46 #include <bus/cam/cam_debug.h>
47 #include <bus/cam/scsi/scsi_all.h>
50 #include "atapi-all.h"
52 /* hardware command descriptor block */
54 struct atapi_xpt_softc *softc;
60 u_int8_t cmd[CAM_MAX_CDBLEN];
62 #define DOING_AUTOSENSE 1
65 TAILQ_ENTRY(atapi_hcb) chain;
68 /* private data associated with an ATA bus */
69 struct atapi_xpt_softc {
70 struct ata_channel *ata_ch;
71 struct cam_path *path;
74 #define BUS_REGISTERED 0x01
75 #define RESOURCE_SHORTAGE 0x02
77 TAILQ_HEAD(,atapi_hcb) pending_hcbs;
78 LIST_ENTRY(atapi_xpt_softc) chain;
81 enum reinit_reason { ATTACH, RESET };
83 static LIST_HEAD(,atapi_xpt_softc) all_buses = LIST_HEAD_INITIALIZER(all_buses);
86 static void atapi_action(struct cam_sim *, union ccb *);
87 static void atapi_poll(struct cam_sim *);
88 static void atapi_async(void *, u_int32_t, struct cam_path *, void *);
89 static void atapi_async1(void *, u_int32_t, struct cam_path *, void *);
90 static int atapi_cb(struct atapi_request *);
92 /* internal functions */
93 static void reinit_bus(struct atapi_xpt_softc *scp, enum reinit_reason reason);
94 static void setup_dev(struct atapi_xpt_softc *, struct ata_device *);
95 static void setup_async_cb(struct atapi_xpt_softc *, uint32_t);
96 static void cam_rescan_callback(struct cam_periph *, union ccb *);
97 static void cam_rescan(struct cam_sim *);
98 static void free_hcb_and_ccb_done(struct atapi_hcb *, u_int32_t);
99 static struct atapi_hcb *allocate_hcb(struct atapi_xpt_softc *, int, int, union ccb *);
100 static void free_hcb(struct atapi_hcb *hcb);
101 static void free_softc(struct atapi_xpt_softc *scp);
102 static struct atapi_xpt_softc *get_softc(struct ata_channel *ata_ch);
103 static struct ata_device *get_ata_device(struct atapi_xpt_softc *scp, int id);
105 static MALLOC_DEFINE(M_ATACAM, "ATA CAM transport", "ATA driver CAM-XPT layer");
108 atapi_cam_attach_bus(struct ata_channel *ata_ch)
110 struct atapi_xpt_softc *scp = NULL;
111 struct cam_devq *devq = NULL;
112 struct cam_sim *sim = NULL;
113 struct cam_path *path = NULL;
116 LIST_FOREACH(scp, &all_buses, chain) {
117 if (scp->ata_ch == ata_ch)
121 scp = kmalloc(sizeof(struct atapi_xpt_softc), M_ATACAM, M_INTWAIT | M_ZERO);
122 scp->ata_ch = ata_ch;
123 TAILQ_INIT(&scp->pending_hcbs);
124 LIST_INSERT_HEAD(&all_buses, scp, chain);
125 unit = device_get_unit(ata_ch->dev);
127 devq = cam_simq_alloc(16);
128 sim = cam_sim_alloc(atapi_action, atapi_poll, "ata", (void *)scp,
129 unit, &sim_mplock, 1, 1, devq);
130 cam_simq_release(devq);
135 if (xpt_bus_register(sim, 0) != CAM_SUCCESS) {
138 scp->flags |= BUS_REGISTERED;
140 if (xpt_create_path(&path, /*periph*/ NULL,
141 cam_sim_path(sim), CAM_TARGET_WILDCARD,
142 CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
147 CAM_DEBUG(path, CAM_DEBUG_TRACE, ("Registered SIM for ata%d\n", unit));
149 setup_async_cb(scp, AC_LOST_DEVICE);
150 reinit_bus(scp, ATTACH);
158 atapi_cam_detach_bus(struct ata_channel *ata_ch)
160 struct atapi_xpt_softc *scp = get_softc(ata_ch);
165 atapi_cam_reinit_bus(struct ata_channel *ata_ch) {
166 struct atapi_xpt_softc *scp = get_softc(ata_ch);
169 * scp might be null if the bus is being reinitialised during
170 * the boot-up sequence, before the ATAPI bus is registered.
174 reinit_bus(scp, RESET);
178 reinit_bus(struct atapi_xpt_softc *scp, enum reinit_reason reason) {
179 if (scp->ata_ch->devices & ATA_ATAPI_MASTER)
180 setup_dev(scp, &scp->ata_ch->device[MASTER]);
181 if (scp->ata_ch->devices & ATA_ATAPI_SLAVE)
182 setup_dev(scp, &scp->ata_ch->device[SLAVE]);
186 xpt_async(AC_BUS_RESET, scp->path, NULL);
189 cam_rescan(scp->sim);
195 setup_dev(struct atapi_xpt_softc *scp, struct ata_device *atp)
197 if (atp->driver == NULL) {
198 ata_set_name(atp, "atapicam",
199 2 * device_get_unit(atp->channel->dev) +
200 (atp->unit == ATA_MASTER) ? 0 : 1);
201 atp->driver = (void *)scp;
206 setup_async_cb(struct atapi_xpt_softc *scp, uint32_t events)
208 struct ccb_setasync csa;
210 xpt_setup_ccb(&csa.ccb_h, scp->path, /*priority*/ 5);
211 csa.ccb_h.func_code = XPT_SASYNC_CB;
212 csa.event_enable = events;
213 csa.callback = &atapi_async;
214 csa.callback_arg = scp->sim;
215 xpt_action((union ccb *) &csa);
219 atapi_action(struct cam_sim *sim, union ccb *ccb)
221 struct atapi_xpt_softc *softc = (struct atapi_xpt_softc*)cam_sim_softc(sim);
222 struct ccb_hdr *ccb_h = &ccb->ccb_h;
223 struct atapi_hcb *hcb = NULL;
224 int unit = cam_sim_unit(sim);
225 int bus = cam_sim_bus(sim);
229 switch (ccb_h->func_code) {
231 struct ccb_pathinq *cpi = &ccb->cpi;
233 cpi->version_num = 1;
234 cpi->hba_inquiry = 0;
235 cpi->target_sprt = 0;
236 #if !defined(NO_ATANG)
237 cpi->hba_misc = PIM_NO_6_BYTE;
241 cpi->hba_eng_cnt = 0;
242 bzero(cpi->vuhba_flags, sizeof(cpi->vuhba_flags));
245 cpi->async_flags = 0;
247 cpi->initiator_id = 7;
248 strncpy(cpi->sim_vid, "FreeBSD", sizeof(cpi->sim_vid));
249 strncpy(cpi->hba_vid, "ATAPI", sizeof(cpi->hba_vid));
250 strncpy(cpi->dev_name, cam_sim_name(sim), sizeof cpi->dev_name);
251 cpi->unit_number = cam_sim_unit(sim);
252 cpi->bus_id = cam_sim_bus(sim);
253 cpi->base_transfer_speed = 3300;
254 cpi->transport = XPORT_ATA;
255 cpi->transport_version = 2;
256 cpi->protocol = PROTO_SCSI;
257 cpi->protocol_version = SCSI_REV_2;
258 if (softc->ata_ch && ccb_h->target_id != CAM_TARGET_WILDCARD) {
259 switch (softc->ata_ch->device[ccb_h->target_id].mode) {
261 cpi->base_transfer_speed = 5200;
264 cpi->base_transfer_speed = 7000;
267 cpi->base_transfer_speed = 11000;
272 cpi->base_transfer_speed = 16000;
275 cpi->base_transfer_speed = 33000;
278 cpi->base_transfer_speed = 66000;
281 cpi->base_transfer_speed = 100000;
284 cpi->base_transfer_speed = 133000;
290 ccb->ccb_h.status = CAM_REQ_CMP;
295 case XPT_RESET_DEV: {
296 int tid = ccb_h->target_id;
297 struct ata_device *dev = get_ata_device(softc, tid);
299 CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("dev reset\n"));
301 ccb->ccb_h.status = CAM_REQ_CMP;
307 CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("bus reset\n"));
308 ata_reinit(softc->ata_ch);
309 ccb->ccb_h.status = CAM_REQ_CMP;
313 case XPT_SET_TRAN_SETTINGS:
314 /* ignore these, we're not doing SCSI here */
315 CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE,
316 ("SET_TRAN_SETTINGS not supported\n"));
317 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
321 case XPT_GET_TRAN_SETTINGS: {
322 struct ccb_trans_settings *cts = &ccb->cts;
323 cts->protocol = PROTO_SCSI;
324 cts->protocol_version = SCSI_REV_2;
325 cts->transport = XPORT_ATA;
326 cts->transport_version = XPORT_VERSION_UNSPECIFIED;
327 cts->proto_specific.valid = 0;
328 cts->xport_specific.valid = 0;
329 /* nothing more to do */
330 ccb->ccb_h.status = CAM_REQ_CMP;
331 CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("GET_TRAN_SETTINGS\n"));
336 case XPT_CALC_GEOMETRY: {
337 struct ccb_calc_geometry *ccg;
338 unsigned int size_mb;
339 unsigned int secs_per_cylinder;
342 CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("CALC_GEOMETRY\n"));
344 size_mb = ccg->volume_size / ((1024L * 1024L) / ccg->block_size);
347 if (size_mb > 1024 && extended) {
349 ccg->secs_per_track = 63;
352 ccg->secs_per_track = 32;
354 secs_per_cylinder = ccg->heads * ccg->secs_per_track;
355 ccg->cylinders = ccg->volume_size / secs_per_cylinder;
356 ccb->ccb_h.status = CAM_REQ_CMP;
362 struct ccb_scsiio *csio = &ccb->csio;
363 int tid = ccb_h->target_id, lid = ccb_h->target_lun;
364 struct ata_device *dev = get_ata_device(softc, tid);
366 CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE, ("XPT_SCSI_IO\n"));
368 /* check that this request was not aborted already */
369 if ((ccb_h->status & CAM_STATUS_MASK) != CAM_REQ_INPROG) {
370 kprintf("XPT_SCSI_IO received but already in progress?\n");
375 CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
376 ("SCSI IO received for invalid device\n"));
377 ccb_h->status = CAM_TID_INVALID;
382 CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
383 ("SCSI IO received for invalid lun %d\n", lid));
384 ccb_h->status = CAM_LUN_INVALID;
388 if ((ccb_h->flags & CAM_SCATTER_VALID)) {
389 /* scatter-gather not supported */
390 xpt_print_path(ccb_h->path);
391 kprintf("ATAPI-CAM does not support scatter-gather yet!\n");
394 if ((hcb = allocate_hcb(softc, unit, bus, ccb)) == NULL)
397 ccb_h->status |= CAM_SIM_QUEUED;
399 bcopy((ccb_h->flags & CAM_CDB_POINTER) ?
400 csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes,
401 hcb->cmd, csio->cdb_len);
403 if (CAM_DEBUGGED(ccb_h->path, CAM_DEBUG_CDB)) {
404 char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
406 kprintf("atapi_action: hcb@%p: %s\n", hcb,
407 scsi_cdb_string(hcb->cmd, cdb_str, sizeof(cdb_str)));
411 len = csio->dxfer_len;
412 buf = csio->data_ptr;
414 /* some SCSI commands require special processing */
415 switch (hcb->cmd[0]) {
418 * many ATAPI devices seem to report more than
419 * SHORT_INQUIRY_LENGTH bytes of available INQUIRY
420 * information, but respond with some incorrect condition
421 * when actually asked for it, so we are going to pretend
422 * that only SHORT_INQUIRY_LENGTH are expected, anyway.
424 struct scsi_inquiry *inq = (struct scsi_inquiry *) &hcb->cmd[0];
426 if (inq->byte2 == 0 && inq->page_code == 0 &&
427 inq->length > SHORT_INQUIRY_LENGTH) {
429 len = inq->length = SHORT_INQUIRY_LENGTH;
433 #if defined(NO_ATANG) /* EXITED IN ORIGINAL, DELETED IN ATANG */
439 * not supported by ATAPI/MMC devices (per SCSI MMC spec)
440 * translate to _10 equivalent.
441 * (actually we should do this only if we have tried
442 * MODE_foo_6 and received ILLEGAL_REQUEST or
443 * INVALID COMMAND OPERATION CODE)
444 * alternative fix: behave like a honest CAM transport,
445 * do not muck with CDB contents, and change scsi_cd to
446 * always use MODE_SENSE_10 in cdgetmode(), or let scsi_cd
447 * know that this specific unit is an ATAPI/MMC one,
448 * and in /that case/ use MODE_SENSE_10
451 CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
452 ("Translating %s into _10 equivalent\n",
453 (hcb->cmd[0] == MODE_SELECT_6) ?
454 "MODE_SELECT_6" : "MODE_SENSE_6"));
458 hcb->cmd[8] = hcb->cmd[4];
459 hcb->cmd[9] = hcb->cmd[5];
469 CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
470 ("Translating %s into _10 equivalent\n",
471 (hcb->cmd[0] == READ_6) ? "READ_6" : "WRITE_6"));
473 hcb->cmd[9] = hcb->cmd[5];
474 hcb->cmd[8] = hcb->cmd[4];
477 hcb->cmd[5] = hcb->cmd[3];
478 hcb->cmd[4] = hcb->cmd[2];
479 hcb->cmd[3] = hcb->cmd[1] & 0x1f;
485 if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_IN && (len & 1)) {
486 /* ATA always transfers an even number of bytes */
488 buf = hcb->dxfer_alloc = kmalloc(len, M_ATACAM, M_INTWAIT | M_ZERO);
491 TAILQ_INSERT_TAIL(&softc->pending_hcbs, hcb, chain);
493 if (atapi_queue_cmd(dev, hcb->cmd, buf, len,
494 (((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_IN) ?
495 ATPR_F_READ : 0) | ATPR_F_QUIET,
496 ccb_h->timeout, atapi_cb, (void *)hcb) == 0)
502 CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
503 ("unsupported function code 0x%02x\n", ccb_h->func_code));
504 ccb_h->status = CAM_REQ_INVALID;
512 xpt_print_path(ccb_h->path);
513 kprintf("out of memory, freezing queue.\n");
514 softc->flags |= RESOURCE_SHORTAGE;
515 xpt_freeze_simq(sim, /*count*/ 1);
516 ccb_h->status = CAM_REQUEUE_REQ;
521 atapi_poll(struct cam_sim *sim)
523 /* do nothing - we do not actually service any interrupts */
524 kprintf("atapi_poll called!\n");
528 atapi_cb(struct atapi_request *req)
530 struct atapi_hcb *hcb = (struct atapi_hcb *) req->driver;
531 struct ccb_scsiio *csio = &hcb->ccb->csio;
532 int hcb_status = req->result;
536 if (CAM_DEBUGGED(csio->ccb_h.path, CAM_DEBUG_CDB)) {
537 kprintf("atapi_cb: hcb@%p status = %02x: (sk = %02x%s%s%s)\n",
538 hcb, hcb_status, hcb_status >> 4,
539 (hcb_status & 4) ? " ABRT" : "",
540 (hcb_status & 2) ? " EOM" : "",
541 (hcb_status & 1) ? " ILI" : "");
542 kprintf(" %s: cmd %02x - sk=%02x asc=%02x ascq=%02x\n",
543 req->device->name, req->ccb[0], req->sense.sense_key,
544 req->sense.asc, req->sense.ascq);
547 if (hcb_status != 0) {
548 csio->scsi_status = SCSI_STATUS_CHECK_COND;
549 if ((csio->ccb_h.flags & CAM_DIS_AUTOSENSE) == 0) {
550 csio->ccb_h.status |= CAM_AUTOSNS_VALID;
551 bcopy((void *)&req->sense, (void *)&csio->sense_data,
552 sizeof(struct atapi_reqsense));
554 free_hcb_and_ccb_done(hcb, CAM_SCSI_STATUS_ERROR);
557 if (((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) &&
558 hcb->dxfer_alloc != NULL)
559 bcopy(hcb->dxfer_alloc, csio->data_ptr, csio->dxfer_len);
560 csio->scsi_status = SCSI_STATUS_OK;
561 free_hcb_and_ccb_done(hcb, CAM_REQ_CMP);
568 free_hcb_and_ccb_done(struct atapi_hcb *hcb, u_int32_t status)
570 struct atapi_xpt_softc *softc = hcb->softc;
571 union ccb *ccb = hcb->ccb;
574 /* we're about to free a hcb, so the shortage has ended */
575 if (softc->flags & RESOURCE_SHORTAGE) {
576 softc->flags &= ~RESOURCE_SHORTAGE;
577 status |= CAM_RELEASE_SIMQ;
582 status | (ccb->ccb_h.status & ~(CAM_STATUS_MASK | CAM_SIM_QUEUED));
587 atapi_async(void *callback_arg, u_int32_t code,
588 struct cam_path *path, void *arg)
591 atapi_async1(callback_arg, code, path, arg);
596 atapi_async1(void *callback_arg, u_int32_t code,
597 struct cam_path* path, void *arg)
599 struct atapi_xpt_softc *softc;
603 sim = (struct cam_sim *) callback_arg;
604 softc = (struct atapi_xpt_softc *) cam_sim_softc(sim);
607 targ = xpt_path_target_id(path);
608 xpt_print_path(path);
610 kprintf("Lost host adapter\n");
612 kprintf("Lost target %d???\n", targ);
621 cam_rescan_callback(struct cam_periph *periph, union ccb *ccb)
623 if (ccb->ccb_h.status != CAM_REQ_CMP) {
624 CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE,
625 ("Rescan failed, 0x%04x\n", ccb->ccb_h.status));
627 CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE,
628 ("Rescan succeeded\n"));
630 xpt_free_path(ccb->ccb_h.path);
631 kfree(ccb, M_ATACAM);
635 cam_rescan(struct cam_sim *sim)
637 struct cam_path *path;
638 union ccb *ccb = kmalloc(sizeof(union ccb), M_ATACAM, M_INTWAIT | M_ZERO);
640 if (xpt_create_path(&path, xpt_periph, cam_sim_path(sim),
641 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP)
644 CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE, ("Rescanning ATAPI bus.\n"));
645 xpt_setup_ccb(&ccb->ccb_h, path, 5/*priority (low)*/);
646 ccb->ccb_h.func_code = XPT_SCAN_BUS;
647 ccb->ccb_h.cbfcnp = cam_rescan_callback;
648 ccb->crcn.flags = CAM_FLAG_NONE;
650 /* scan is in progress now */
653 static struct atapi_hcb *
654 allocate_hcb(struct atapi_xpt_softc *softc, int unit, int bus, union ccb *ccb)
656 struct atapi_hcb *hcb;
658 hcb = kmalloc(sizeof(struct atapi_hcb), M_ATACAM, M_INTWAIT | M_ZERO);
670 free_hcb(struct atapi_hcb *hcb)
672 TAILQ_REMOVE(&hcb->softc->pending_hcbs, hcb, chain);
673 if (hcb->dxfer_alloc != NULL)
674 kfree(hcb->dxfer_alloc, M_ATACAM);
675 kfree(hcb, M_ATACAM);
679 free_softc(struct atapi_xpt_softc *scp)
681 struct atapi_hcb *hcb;
684 TAILQ_FOREACH(hcb, &scp->pending_hcbs, chain) {
685 free_hcb_and_ccb_done(hcb, CAM_UNREC_HBA_ERROR);
687 if (scp->path != NULL) {
688 setup_async_cb(scp, 0);
689 xpt_free_path(scp->path);
691 if ((scp->flags & BUS_REGISTERED) != 0) {
692 if (xpt_bus_deregister(cam_sim_path(scp->sim)) == CAM_REQ_CMP)
693 scp->flags &= ~BUS_REGISTERED;
695 if (scp->sim != NULL) {
696 if ((scp->flags & BUS_REGISTERED) == 0)
697 cam_sim_free(scp->sim);
699 kprintf("Can't free %s SIM (still registered)\n",
700 cam_sim_name(scp->sim));
702 LIST_REMOVE(scp, chain);
703 kfree(scp, M_ATACAM);
707 static struct atapi_xpt_softc *
708 get_softc(struct ata_channel *ata_ch) {
709 struct atapi_xpt_softc *scp;
710 LIST_FOREACH(scp, &all_buses, chain) {
711 if (scp->ata_ch == ata_ch)
717 static struct ata_device *
718 get_ata_device(struct atapi_xpt_softc *scp, int id)
720 int role = ATA_ATAPI_MASTER;
724 role = ATA_ATAPI_SLAVE;
728 if (scp->ata_ch->devices & role)
729 return &scp->ata_ch->device[id];