2 * Copyright (C) 1996-1999 Gadi Oxman <gadio@netvision.net.il>
3 * Copyright (C) 2004-2005 Bartlomiej Zolnierkiewicz
7 * Emulation of a SCSI host adapter for IDE ATAPI devices.
9 * With this driver, one can use the Linux SCSI drivers instead of the
10 * native IDE ATAPI drivers.
12 * Ver 0.1 Dec 3 96 Initial version.
13 * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
14 * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
15 * to Janos Farkas for pointing this out.
16 * Avoid using bitfields in structures for m68k.
17 * Added Scatter/Gather and DMA support.
18 * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
19 * Use variable timeout for each command.
20 * Ver 0.5 Jan 2 98 Fix previous PD/CD support.
21 * Allow disabling of SCSI-6 to SCSI-10 transformation.
22 * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
23 * for access through /dev/sg.
24 * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
25 * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
26 * detection of devices with CONFIG_SCSI_MULTI_LUN
27 * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
28 * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
29 * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
30 * Ver 0.92 Dec 31 02 Implement new SCSI mid level API
33 #define IDESCSI_VERSION "0.92"
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/string.h>
38 #include <linux/kernel.h>
40 #include <linux/ioport.h>
41 #include <linux/blkdev.h>
42 #include <linux/errno.h>
43 #include <linux/slab.h>
44 #include <linux/ide.h>
45 #include <linux/scatterlist.h>
46 #include <linux/delay.h>
47 #include <linux/mutex.h>
48 #include <linux/bitops.h>
51 #include <asm/uaccess.h>
53 #include <scsi/scsi.h>
54 #include <scsi/scsi_cmnd.h>
55 #include <scsi/scsi_device.h>
56 #include <scsi/scsi_host.h>
57 #include <scsi/scsi_tcq.h>
60 #define IDESCSI_DEBUG_LOG 0
63 #define debug_log(fmt, args...) \
64 printk(KERN_INFO "ide-scsi: " fmt, ## args)
66 #define debug_log(fmt, args...) do {} while (0)
70 * SCSI command transformation layer
72 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
77 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
79 typedef struct ide_scsi_obj {
83 struct Scsi_Host *host;
85 unsigned long transform; /* SCSI cmd translation layer */
86 unsigned long log; /* log flags */
89 static DEFINE_MUTEX(idescsi_ref_mutex);
90 /* Set by module param to skip cd */
91 static int idescsi_nocd;
93 #define ide_scsi_g(disk) \
94 container_of((disk)->private_data, struct ide_scsi_obj, driver)
96 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
98 struct ide_scsi_obj *scsi = NULL;
100 mutex_lock(&idescsi_ref_mutex);
101 scsi = ide_scsi_g(disk);
103 if (ide_device_get(scsi->drive))
106 scsi_host_get(scsi->host);
108 mutex_unlock(&idescsi_ref_mutex);
112 static void ide_scsi_put(struct ide_scsi_obj *scsi)
114 ide_drive_t *drive = scsi->drive;
116 mutex_lock(&idescsi_ref_mutex);
117 scsi_host_put(scsi->host);
118 ide_device_put(drive);
119 mutex_unlock(&idescsi_ref_mutex);
122 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
124 return (idescsi_scsi_t*) (&host[1]);
127 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
129 return scsihost_to_idescsi(ide_drive->driver_data);
132 static void ide_scsi_hex_dump(u8 *data, int len)
134 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
137 static int idescsi_end_request(ide_drive_t *, int, int);
139 static void ide_scsi_callback(ide_drive_t *drive, int dsc)
141 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
142 struct ide_atapi_pc *pc = drive->pc;
144 if (pc->flags & PC_FLAG_TIMEDOUT)
145 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
146 pc->scsi_cmd->serial_number, jiffies);
147 /* end this request now - scsi should retry it*/
148 else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
149 printk(KERN_INFO "Packet command completed, %d bytes"
150 " transferred\n", pc->xferred);
152 idescsi_end_request(drive, 1, 0);
155 static int idescsi_check_condition(ide_drive_t *drive,
156 struct request *failed_cmd)
158 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
159 struct ide_atapi_pc *pc;
163 /* stuff a sense request in front of our current request */
164 pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
165 rq = blk_get_request(drive->queue, READ, GFP_ATOMIC);
166 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
167 if (!pc || !rq || !buf) {
174 rq->special = (char *) pc;
177 pc->c[0] = REQUEST_SENSE;
178 pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
179 rq->cmd_type = REQ_TYPE_SENSE;
180 rq->cmd_flags |= REQ_PREEMPT;
181 pc->timeout = jiffies + WAIT_READY;
182 /* NOTE! Save the failed packet command in "rq->buffer" */
183 rq->buffer = (void *) failed_cmd->special;
184 pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
185 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
186 printk ("ide-scsi: %s: queue cmd = ", drive->name);
187 ide_scsi_hex_dump(pc->c, 6);
189 rq->rq_disk = scsi->disk;
191 memcpy(rq->cmd, pc->c, 12);
192 ide_do_drive_cmd(drive, rq);
196 static ide_startstop_t
197 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
199 ide_hwif_t *hwif = drive->hwif;
201 if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
203 hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE);
207 idescsi_end_request(drive, 0, 0);
212 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
214 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
215 struct request *rq = HWGROUP(drive)->rq;
216 struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
217 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
218 struct Scsi_Host *host;
219 int errors = rq->errors;
222 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
223 ide_end_request(drive, uptodate, nrsecs);
226 ide_end_drive_cmd (drive, 0, 0);
227 if (blk_sense_request(rq)) {
228 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
230 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
231 ide_scsi_hex_dump(pc->buf, 16);
233 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
234 SCSI_SENSE_BUFFERSIZE);
240 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
241 (((pc->flags & PC_FLAG_TIMEDOUT) ?
244 } else if (pc->flags & PC_FLAG_TIMEDOUT) {
246 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
247 drive->name, pc->scsi_cmd->serial_number);
248 pc->scsi_cmd->result = DID_TIME_OUT << 16;
249 } else if (errors >= ERROR_MAX) {
250 pc->scsi_cmd->result = DID_ERROR << 16;
252 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
255 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
256 if (!idescsi_check_condition(drive, rq))
257 /* we started a request sense, so we'll be back, exit for now */
259 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
261 pc->scsi_cmd->result = DID_OK << 16;
263 host = pc->scsi_cmd->device->host;
264 spin_lock_irqsave(host->host_lock, flags);
265 pc->done(pc->scsi_cmd);
266 spin_unlock_irqrestore(host->host_lock, flags);
274 * Our interrupt handler.
276 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
278 return ide_pc_intr(drive, idescsi_pc_intr, NULL, ide_io_buffers);
281 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
283 return ide_transfer_pc(drive, idescsi_pc_intr,
284 ide_scsi_get_timeout(drive->pc),
288 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
291 case READ_6: case READ_10: case READ_12:
292 pc->flags &= ~PC_FLAG_WRITING;
294 case WRITE_6: case WRITE_10: case WRITE_12:
295 pc->flags |= PC_FLAG_WRITING;
302 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
304 ide_hwif_t *hwif = drive->hwif;
305 struct scatterlist *sg, *scsi_sg;
308 if (!pc->req_xfer || pc->req_xfer % 1024)
311 if (idescsi_set_direction(pc))
315 scsi_sg = scsi_sglist(pc->scsi_cmd);
316 segments = scsi_sg_count(pc->scsi_cmd);
318 if (segments > hwif->sg_max_nents)
321 hwif->sg_nents = segments;
322 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
327 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
328 struct ide_atapi_pc *pc)
330 /* Set the current packet command */
333 return ide_issue_pc(drive, idescsi_transfer_pc,
334 ide_scsi_get_timeout(pc), ide_scsi_expiry);
338 * idescsi_do_request is our request handling function.
340 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
342 debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
343 rq->cmd[0], rq->errors);
344 debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
345 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
347 if (blk_sense_request(rq) || blk_special_request(rq)) {
348 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
350 if (drive->using_dma && !idescsi_map_sg(drive, pc))
351 pc->flags |= PC_FLAG_DMA_OK;
353 return idescsi_issue_pc(drive, pc);
355 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
356 idescsi_end_request (drive, 0, 0);
360 #ifdef CONFIG_IDE_PROC_FS
361 #define ide_scsi_devset_get(name, field) \
362 static int get_##name(ide_drive_t *drive) \
364 idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
365 return scsi->field; \
368 #define ide_scsi_devset_set(name, field) \
369 static int set_##name(ide_drive_t *drive, int arg) \
371 idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
376 #define ide_scsi_devset_rw_field(_name, _field) \
377 ide_scsi_devset_get(_name, _field); \
378 ide_scsi_devset_set(_name, _field); \
379 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name);
381 ide_devset_rw_field(bios_cyl, bios_cyl);
382 ide_devset_rw_field(bios_head, bios_head);
383 ide_devset_rw_field(bios_sect, bios_sect);
385 ide_scsi_devset_rw_field(transform, transform);
386 ide_scsi_devset_rw_field(log, log);
388 static const struct ide_proc_devset idescsi_settings[] = {
389 IDE_PROC_DEVSET(bios_cyl, 0, 1023),
390 IDE_PROC_DEVSET(bios_head, 0, 255),
391 IDE_PROC_DEVSET(bios_sect, 0, 63),
392 IDE_PROC_DEVSET(log, 0, 1),
393 IDE_PROC_DEVSET(transform, 0, 3),
399 * Driver initialization.
401 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
403 if ((drive->id[ATA_ID_CONFIG] & 0x0060) == 0x20)
404 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
405 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
406 #if IDESCSI_DEBUG_LOG
407 set_bit(IDESCSI_LOG_CMD, &scsi->log);
408 #endif /* IDESCSI_DEBUG_LOG */
410 drive->pc_callback = ide_scsi_callback;
412 ide_proc_register_driver(drive, scsi->driver);
415 static void ide_scsi_remove(ide_drive_t *drive)
417 struct Scsi_Host *scsihost = drive->driver_data;
418 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
419 struct gendisk *g = scsi->disk;
421 scsi_remove_host(scsihost);
422 ide_proc_unregister_driver(drive, scsi->driver);
424 ide_unregister_region(g);
426 drive->driver_data = NULL;
427 g->private_data = NULL;
435 static int ide_scsi_probe(ide_drive_t *);
437 #ifdef CONFIG_IDE_PROC_FS
438 static ide_proc_entry_t idescsi_proc[] = {
439 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
440 { NULL, 0, NULL, NULL }
444 static ide_driver_t idescsi_driver = {
446 .owner = THIS_MODULE,
448 .bus = &ide_bus_type,
450 .probe = ide_scsi_probe,
451 .remove = ide_scsi_remove,
452 .version = IDESCSI_VERSION,
454 .do_request = idescsi_do_request,
455 .end_request = idescsi_end_request,
456 .error = idescsi_atapi_error,
457 #ifdef CONFIG_IDE_PROC_FS
458 .proc = idescsi_proc,
459 .settings = idescsi_settings,
463 static int idescsi_ide_open(struct inode *inode, struct file *filp)
465 struct gendisk *disk = inode->i_bdev->bd_disk;
466 struct ide_scsi_obj *scsi;
468 if (!(scsi = ide_scsi_get(disk)))
474 static int idescsi_ide_release(struct inode *inode, struct file *filp)
476 struct gendisk *disk = inode->i_bdev->bd_disk;
477 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
484 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
485 unsigned int cmd, unsigned long arg)
487 struct block_device *bdev = inode->i_bdev;
488 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
489 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
492 static struct block_device_operations idescsi_ops = {
493 .owner = THIS_MODULE,
494 .open = idescsi_ide_open,
495 .release = idescsi_ide_release,
496 .ioctl = idescsi_ide_ioctl,
499 static int idescsi_slave_configure(struct scsi_device * sdp)
501 /* Configure detected device */
502 sdp->use_10_for_rw = 1;
503 sdp->use_10_for_ms = 1;
504 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
508 static const char *idescsi_info (struct Scsi_Host *host)
510 return "SCSI host adapter emulation for IDE ATAPI devices";
513 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
515 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
517 if (cmd == SG_SET_TRANSFORM) {
519 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
521 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
523 } else if (cmd == SG_GET_TRANSFORM)
524 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
528 static int idescsi_queue (struct scsi_cmnd *cmd,
529 void (*done)(struct scsi_cmnd *))
531 struct Scsi_Host *host = cmd->device->host;
532 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
533 ide_drive_t *drive = scsi->drive;
534 struct request *rq = NULL;
535 struct ide_atapi_pc *pc = NULL;
536 int write = cmd->sc_data_direction == DMA_TO_DEVICE;
539 scmd_printk (KERN_ERR, cmd, "drive not present\n");
542 scsi = drive_to_idescsi(drive);
543 pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
544 rq = blk_get_request(drive->queue, write, GFP_ATOMIC);
545 if (rq == NULL || pc == NULL) {
546 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
550 memset (pc->c, 0, 12);
552 if (cmd->sc_data_direction == DMA_TO_DEVICE)
553 pc->flags |= PC_FLAG_WRITING;
555 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
557 pc->sg = scsi_sglist(cmd);
558 pc->sg_cnt = scsi_sg_count(cmd);
560 pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
563 pc->timeout = jiffies + cmd->request->timeout;
565 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
566 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
567 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
568 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
569 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
570 ide_scsi_hex_dump(pc->c, 12);
574 rq->special = (char *) pc;
575 rq->cmd_type = REQ_TYPE_SPECIAL;
576 spin_unlock_irq(host->host_lock);
578 memcpy(rq->cmd, pc->c, 12);
579 blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
580 spin_lock_irq(host->host_lock);
586 cmd->result = DID_ERROR << 16;
591 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
593 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
594 ide_drive_t *drive = scsi->drive;
598 struct ide_atapi_pc *pc;
600 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
602 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
603 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
606 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
611 /* First give it some more time, how much is "right" is hard to say :-( */
613 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
614 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
615 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
617 spin_lock_irq(&ide_lock);
619 /* If there is no pc running we're done (our interrupt took care of it) */
626 /* It's somewhere in flight. Does ide subsystem agree? */
627 if (pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
628 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != pc->rq) {
630 * FIXME - not sure this condition can ever occur
632 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
634 if (blk_sense_request(pc->rq))
636 /* we need to call blk_put_request twice. */
637 blk_put_request(pc->rq);
638 blk_put_request(pc->rq);
646 spin_unlock_irq(&ide_lock);
648 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
649 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
654 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
657 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
658 ide_drive_t *drive = scsi->drive;
662 struct ide_atapi_pc *pc;
664 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
666 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
667 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
670 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
675 spin_lock_irq(cmd->device->host->host_lock);
676 spin_lock(&ide_lock);
680 if (pc == NULL || (req = pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
681 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
682 spin_unlock(&ide_lock);
683 spin_unlock_irq(cmd->device->host->host_lock);
687 /* kill current request */
688 if (__blk_end_request(req, -EIO, 0))
690 if (blk_sense_request(req))
694 blk_put_request(req);
696 /* now nuke the drive queue */
697 while ((req = elv_next_request(drive->queue))) {
698 if (__blk_end_request(req, -EIO, 0))
702 HWGROUP(drive)->rq = NULL;
703 HWGROUP(drive)->handler = NULL;
704 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
705 spin_unlock(&ide_lock);
709 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
712 spin_unlock_irq(cmd->device->host->host_lock);
714 spin_lock_irq(cmd->device->host->host_lock);
715 } while ( HWGROUP(drive)->handler );
717 ready = drive_is_ready(drive);
718 HWGROUP(drive)->busy--;
720 printk (KERN_ERR "ide-scsi: reset failed!\n");
724 spin_unlock_irq(cmd->device->host->host_lock);
728 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
729 sector_t capacity, int *parm)
731 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
732 ide_drive_t *drive = idescsi->drive;
734 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
735 parm[0] = drive->bios_head;
736 parm[1] = drive->bios_sect;
737 parm[2] = drive->bios_cyl;
742 static struct scsi_host_template idescsi_template = {
743 .module = THIS_MODULE,
745 .info = idescsi_info,
746 .slave_configure = idescsi_slave_configure,
747 .ioctl = idescsi_ioctl,
748 .queuecommand = idescsi_queue,
749 .eh_abort_handler = idescsi_eh_abort,
750 .eh_host_reset_handler = idescsi_eh_reset,
751 .bios_param = idescsi_bios,
757 .use_clustering = DISABLE_CLUSTERING,
759 .proc_name = "ide-scsi",
762 static int ide_scsi_probe(ide_drive_t *drive)
764 idescsi_scsi_t *idescsi;
765 struct Scsi_Host *host;
771 if (!warned && drive->media == ide_cdrom) {
772 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
776 if (idescsi_nocd && drive->media == ide_cdrom)
779 if (!strstr("ide-scsi", drive->driver_req) ||
780 drive->media == ide_disk ||
781 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
786 g = alloc_disk(1 << PARTN_BITS);
790 ide_init_disk(g, drive);
794 last_lun = drive->id[ATA_ID_LAST_LUN];
796 debug_log("%s: last_lun=%u\n", drive->name, last_lun);
798 if ((last_lun & 7) != 7)
799 host->max_lun = (last_lun & 7) + 1;
803 drive->driver_data = host;
804 idescsi = scsihost_to_idescsi(host);
805 idescsi->drive = drive;
806 idescsi->driver = &idescsi_driver;
807 idescsi->host = host;
809 g->private_data = &idescsi->driver;
811 idescsi_setup(drive, idescsi);
812 g->fops = &idescsi_ops;
813 ide_register_region(g);
814 err = scsi_add_host(host, &drive->gendev);
816 scsi_scan_host(host);
819 /* fall through on error */
820 ide_unregister_region(g);
821 ide_proc_unregister_driver(drive, &idescsi_driver);
830 static int __init init_idescsi_module(void)
832 return driver_register(&idescsi_driver.gen_driver);
835 static void __exit exit_idescsi_module(void)
837 driver_unregister(&idescsi_driver.gen_driver);
840 module_param(idescsi_nocd, int, 0600);
841 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
842 module_init(init_idescsi_module);
843 module_exit(exit_idescsi_module);
844 MODULE_LICENSE("GPL");