i386: sched.h inclusion from module.h is baack
[linux-2.6] / drivers / scsi / ide-scsi.c
1 /*
2  * linux/drivers/scsi/ide-scsi.c        Version 0.9             Jul   4, 1999
3  *
4  * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
5  */
6
7 /*
8  * Emulation of a SCSI host adapter for IDE ATAPI devices.
9  *
10  * With this driver, one can use the Linux SCSI drivers instead of the
11  * native IDE ATAPI drivers.
12  *
13  * Ver 0.1   Dec  3 96   Initial version.
14  * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
15  *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
16  *                        to Janos Farkas for pointing this out.
17  *                       Avoid using bitfields in structures for m68k.
18  *                       Added Scatter/Gather and DMA support.
19  * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
20  *                       Use variable timeout for each command.
21  * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
22  *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
23  * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
24  *                        for access through /dev/sg.
25  *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
26  * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
27  *                        detection of devices with CONFIG_SCSI_MULTI_LUN
28  * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
29  * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
30  * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
31  * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
32  */
33
34 #define IDESCSI_VERSION "0.92"
35
36 #include <linux/module.h>
37 #include <linux/types.h>
38 #include <linux/string.h>
39 #include <linux/kernel.h>
40 #include <linux/mm.h>
41 #include <linux/ioport.h>
42 #include <linux/blkdev.h>
43 #include <linux/errno.h>
44 #include <linux/hdreg.h>
45 #include <linux/slab.h>
46 #include <linux/ide.h>
47 #include <linux/scatterlist.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50
51 #include <asm/io.h>
52 #include <asm/bitops.h>
53 #include <asm/uaccess.h>
54
55 #include <scsi/scsi.h>
56 #include <scsi/scsi_cmnd.h>
57 #include <scsi/scsi_device.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_tcq.h>
60 #include <scsi/sg.h>
61
62 #define IDESCSI_DEBUG_LOG               0
63
64 typedef struct idescsi_pc_s {
65         u8 c[12];                               /* Actual packet bytes */
66         int request_transfer;                   /* Bytes to transfer */
67         int actually_transferred;               /* Bytes actually transferred */
68         int buffer_size;                        /* Size of our data buffer */
69         struct request *rq;                     /* The corresponding request */
70         u8 *buffer;                             /* Data buffer */
71         u8 *current_position;                   /* Pointer into the above buffer */
72         struct scatterlist *sg;                 /* Scatter gather table */
73         int b_count;                            /* Bytes transferred from current entry */
74         struct scsi_cmnd *scsi_cmd;             /* SCSI command */
75         void (*done)(struct scsi_cmnd *);       /* Scsi completion routine */
76         unsigned long flags;                    /* Status/Action flags */
77         unsigned long timeout;                  /* Command timeout */
78 } idescsi_pc_t;
79
80 /*
81  *      Packet command status bits.
82  */
83 #define PC_DMA_IN_PROGRESS              0       /* 1 while DMA in progress */
84 #define PC_WRITING                      1       /* Data direction */
85 #define PC_TRANSFORM                    2       /* transform SCSI commands */
86 #define PC_TIMEDOUT                     3       /* command timed out */
87 #define PC_DMA_OK                       4       /* Use DMA */
88
89 /*
90  *      SCSI command transformation layer
91  */
92 #define IDESCSI_TRANSFORM               0       /* Enable/Disable transformation */
93 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
94
95 /*
96  *      Log flags
97  */
98 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
99
100 typedef struct ide_scsi_obj {
101         ide_drive_t             *drive;
102         ide_driver_t            *driver;
103         struct gendisk          *disk;
104         struct Scsi_Host        *host;
105
106         idescsi_pc_t *pc;                       /* Current packet command */
107         unsigned long flags;                    /* Status/Action flags */
108         unsigned long transform;                /* SCSI cmd translation layer */
109         unsigned long log;                      /* log flags */
110 } idescsi_scsi_t;
111
112 static DEFINE_MUTEX(idescsi_ref_mutex);
113 static int idescsi_nocd;                        /* Set by module param to skip cd */
114
115 #define ide_scsi_g(disk) \
116         container_of((disk)->private_data, struct ide_scsi_obj, driver)
117
118 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
119 {
120         struct ide_scsi_obj *scsi = NULL;
121
122         mutex_lock(&idescsi_ref_mutex);
123         scsi = ide_scsi_g(disk);
124         if (scsi)
125                 scsi_host_get(scsi->host);
126         mutex_unlock(&idescsi_ref_mutex);
127         return scsi;
128 }
129
130 static void ide_scsi_put(struct ide_scsi_obj *scsi)
131 {
132         mutex_lock(&idescsi_ref_mutex);
133         scsi_host_put(scsi->host);
134         mutex_unlock(&idescsi_ref_mutex);
135 }
136
137 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
138 {
139         return (idescsi_scsi_t*) (&host[1]);
140 }
141
142 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
143 {
144         return scsihost_to_idescsi(ide_drive->driver_data);
145 }
146
147 /*
148  *      Per ATAPI device status bits.
149  */
150 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
151
152 /*
153  *      ide-scsi requests.
154  */
155 #define IDESCSI_PC_RQ                   90
156
157 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
158 {
159         while (bcount--)
160                 (void) HWIF(drive)->INB(IDE_DATA_REG);
161 }
162
163 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
164 {
165         while (bcount--)
166                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
167 }
168
169 /*
170  *      PIO data transfer routines using the scatter gather table.
171  */
172 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
173 {
174         int count;
175         char *buf;
176
177         while (bcount) {
178                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
179                         printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
180                         idescsi_discard_data (drive, bcount);
181                         return;
182                 }
183                 count = min(pc->sg->length - pc->b_count, bcount);
184                 if (PageHighMem(pc->sg->page)) {
185                         unsigned long flags;
186
187                         local_irq_save(flags);
188                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
189                                         pc->sg->offset;
190                         drive->hwif->atapi_input_bytes(drive,
191                                                 buf + pc->b_count, count);
192                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
193                         local_irq_restore(flags);
194                 } else {
195                         buf = page_address(pc->sg->page) + pc->sg->offset;
196                         drive->hwif->atapi_input_bytes(drive,
197                                                 buf + pc->b_count, count);
198                 }
199                 bcount -= count; pc->b_count += count;
200                 if (pc->b_count == pc->sg->length) {
201                         pc->sg++;
202                         pc->b_count = 0;
203                 }
204         }
205 }
206
207 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
208 {
209         int count;
210         char *buf;
211
212         while (bcount) {
213                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
214                         printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
215                         idescsi_output_zeros (drive, bcount);
216                         return;
217                 }
218                 count = min(pc->sg->length - pc->b_count, bcount);
219                 if (PageHighMem(pc->sg->page)) {
220                         unsigned long flags;
221
222                         local_irq_save(flags);
223                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
224                                                 pc->sg->offset;
225                         drive->hwif->atapi_output_bytes(drive,
226                                                 buf + pc->b_count, count);
227                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
228                         local_irq_restore(flags);
229                 } else {
230                         buf = page_address(pc->sg->page) + pc->sg->offset;
231                         drive->hwif->atapi_output_bytes(drive,
232                                                 buf + pc->b_count, count);
233                 }
234                 bcount -= count; pc->b_count += count;
235                 if (pc->b_count == pc->sg->length) {
236                         pc->sg++;
237                         pc->b_count = 0;
238                 }
239         }
240 }
241
242 /*
243  *      Most of the SCSI commands are supported directly by ATAPI devices.
244  *      idescsi_transform_pc handles the few exceptions.
245  */
246 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
247 {
248         u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
249         char *atapi_buf;
250
251         if (!test_bit(PC_TRANSFORM, &pc->flags))
252                 return;
253         if (drive->media == ide_cdrom || drive->media == ide_optical) {
254                 if (c[0] == READ_6 || c[0] == WRITE_6) {
255                         c[8] = c[4];            c[5] = c[3];            c[4] = c[2];
256                         c[3] = c[1] & 0x1f;     c[2] = 0;               c[1] &= 0xe0;
257                         c[0] += (READ_10 - READ_6);
258                 }
259                 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
260                         unsigned short new_len;
261                         if (!scsi_buf)
262                                 return;
263                         if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
264                                 return;
265                         memset(atapi_buf, 0, pc->buffer_size + 4);
266                         memset (c, 0, 12);
267                         c[0] = sc[0] | 0x40;
268                         c[1] = sc[1];
269                         c[2] = sc[2];
270                         new_len = sc[4] + 4;
271                         c[8] = new_len;
272                         c[7] = new_len >> 8;
273                         c[9] = sc[5];
274                         if (c[0] == MODE_SELECT_10) {
275                                 atapi_buf[1] = scsi_buf[0];     /* Mode data length */
276                                 atapi_buf[2] = scsi_buf[1];     /* Medium type */
277                                 atapi_buf[3] = scsi_buf[2];     /* Device specific parameter */
278                                 atapi_buf[7] = scsi_buf[3];     /* Block descriptor length */
279                                 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
280                         }
281                         pc->buffer = atapi_buf;
282                         pc->request_transfer += 4;
283                         pc->buffer_size += 4;
284                 }
285         }
286 }
287
288 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
289 {
290         u8 *atapi_buf = pc->buffer;
291         u8 *sc = pc->scsi_cmd->cmnd;
292         u8 *scsi_buf = pc->scsi_cmd->request_buffer;
293
294         if (!test_bit(PC_TRANSFORM, &pc->flags))
295                 return;
296         if (drive->media == ide_cdrom || drive->media == ide_optical) {
297                 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
298                         scsi_buf[0] = atapi_buf[1];             /* Mode data length */
299                         scsi_buf[1] = atapi_buf[2];             /* Medium type */
300                         scsi_buf[2] = atapi_buf[3];             /* Device specific parameter */
301                         scsi_buf[3] = atapi_buf[7];             /* Block descriptor length */
302                         memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
303                 }
304                 if (pc->c[0] == INQUIRY) {
305                         scsi_buf[2] |= 2;                       /* ansi_revision */
306                         scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
307                 }
308         }
309         if (atapi_buf && atapi_buf != scsi_buf)
310                 kfree(atapi_buf);
311 }
312
313 static void hexdump(u8 *x, int len)
314 {
315         int i;
316
317         printk("[ ");
318         for (i = 0; i < len; i++)
319                 printk("%x ", x[i]);
320         printk("]\n");
321 }
322
323 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
324 {
325         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
326         idescsi_pc_t   *pc;
327         struct request *rq;
328         u8             *buf;
329
330         /* stuff a sense request in front of our current request */
331         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
332         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
333         buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
334         if (pc == NULL || rq == NULL || buf == NULL) {
335                 kfree(buf);
336                 kfree(rq);
337                 kfree(pc);
338                 return -ENOMEM;
339         }
340         memset (pc, 0, sizeof (idescsi_pc_t));
341         memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
342         ide_init_drive_cmd(rq);
343         rq->special = (char *) pc;
344         pc->rq = rq;
345         pc->buffer = buf;
346         pc->c[0] = REQUEST_SENSE;
347         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
348         rq->cmd_type = REQ_TYPE_SENSE;
349         pc->timeout = jiffies + WAIT_READY;
350         /* NOTE! Save the failed packet command in "rq->buffer" */
351         rq->buffer = (void *) failed_command->special;
352         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
353         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
354                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
355                 hexdump(pc->c, 6);
356         }
357         rq->rq_disk = scsi->disk;
358         return ide_do_drive_cmd(drive, rq, ide_preempt);
359 }
360
361 static int idescsi_end_request(ide_drive_t *, int, int);
362
363 static ide_startstop_t
364 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
365 {
366         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
367                 /* force an abort */
368                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
369
370         rq->errors++;
371
372         idescsi_end_request(drive, 0, 0);
373
374         return ide_stopped;
375 }
376
377 static ide_startstop_t
378 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
379 {
380 #if IDESCSI_DEBUG_LOG
381         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
382                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
383 #endif
384         rq->errors |= ERROR_MAX;
385
386         idescsi_end_request(drive, 0, 0);
387
388         return ide_stopped;
389 }
390
391 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
392 {
393         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
394         struct request *rq = HWGROUP(drive)->rq;
395         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
396         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
397         struct Scsi_Host *host;
398         u8 *scsi_buf;
399         int errors = rq->errors;
400         unsigned long flags;
401
402         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
403                 ide_end_request(drive, uptodate, nrsecs);
404                 return 0;
405         }
406         ide_end_drive_cmd (drive, 0, 0);
407         if (blk_sense_request(rq)) {
408                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
409                 if (log) {
410                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
411                         hexdump(pc->buffer,16);
412                 }
413                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
414                 kfree(pc->buffer);
415                 kfree(pc);
416                 kfree(rq);
417                 pc = opc;
418                 rq = pc->rq;
419                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
420                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
421         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
422                 if (log)
423                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
424                                         drive->name, pc->scsi_cmd->serial_number);
425                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
426         } else if (errors >= ERROR_MAX) {
427                 pc->scsi_cmd->result = DID_ERROR << 16;
428                 if (log)
429                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
430         } else if (errors) {
431                 if (log)
432                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
433                 if (!idescsi_check_condition(drive, rq))
434                         /* we started a request sense, so we'll be back, exit for now */
435                         return 0;
436                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
437         } else {
438                 pc->scsi_cmd->result = DID_OK << 16;
439                 idescsi_transform_pc2 (drive, pc);
440                 if (log) {
441                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
442                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
443                                 printk(", rst = ");
444                                 scsi_buf = pc->scsi_cmd->request_buffer;
445                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
446                         } else printk("\n");
447                 }
448         }
449         host = pc->scsi_cmd->device->host;
450         spin_lock_irqsave(host->host_lock, flags);
451         pc->done(pc->scsi_cmd);
452         spin_unlock_irqrestore(host->host_lock, flags);
453         kfree(pc);
454         kfree(rq);
455         scsi->pc = NULL;
456         return 0;
457 }
458
459 static inline unsigned long get_timeout(idescsi_pc_t *pc)
460 {
461         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
462 }
463
464 static int idescsi_expiry(ide_drive_t *drive)
465 {
466         idescsi_scsi_t *scsi = drive->driver_data;
467         idescsi_pc_t   *pc   = scsi->pc;
468
469 #if IDESCSI_DEBUG_LOG
470         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
471 #endif
472         set_bit(PC_TIMEDOUT, &pc->flags);
473
474         return 0;                                       /* we do not want the ide subsystem to retry */
475 }
476
477 /*
478  *      Our interrupt handler.
479  */
480 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
481 {
482         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
483         idescsi_pc_t *pc=scsi->pc;
484         struct request *rq = pc->rq;
485         atapi_bcount_t bcount;
486         atapi_status_t status;
487         atapi_ireason_t ireason;
488         atapi_feature_t feature;
489
490         unsigned int temp;
491
492 #if IDESCSI_DEBUG_LOG
493         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
494 #endif /* IDESCSI_DEBUG_LOG */
495
496         if (test_bit(PC_TIMEDOUT, &pc->flags)){
497 #if IDESCSI_DEBUG_LOG
498                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
499                                 pc->scsi_cmd->serial_number, jiffies);
500 #endif
501                 /* end this request now - scsi should retry it*/
502                 idescsi_end_request (drive, 1, 0);
503                 return ide_stopped;
504         }
505         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
506 #if IDESCSI_DEBUG_LOG
507                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
508 #endif /* IDESCSI_DEBUG_LOG */
509                 pc->actually_transferred=pc->request_transfer;
510                 (void) HWIF(drive)->ide_dma_end(drive);
511         }
512
513         feature.all = 0;
514         /* Clear the interrupt */
515         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
516
517         if (!status.b.drq) {
518                 /* No more interrupts */
519                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
520                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
521                 local_irq_enable_in_hardirq();
522                 if (status.b.check)
523                         rq->errors++;
524                 idescsi_end_request (drive, 1, 0);
525                 return ide_stopped;
526         }
527         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
528         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
529         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
530
531         if (ireason.b.cod) {
532                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
533                 return ide_do_reset (drive);
534         }
535         if (ireason.b.io) {
536                 temp = pc->actually_transferred + bcount.all;
537                 if (temp > pc->request_transfer) {
538                         if (temp > pc->buffer_size) {
539                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
540                                         "send us more data than expected "
541                                         "- discarding data\n");
542                                 temp = pc->buffer_size - pc->actually_transferred;
543                                 if (temp) {
544                                         clear_bit(PC_WRITING, &pc->flags);
545                                         if (pc->sg)
546                                                 idescsi_input_buffers(drive, pc, temp);
547                                         else
548                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
549                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
550                                 }
551                                 pc->actually_transferred += temp;
552                                 pc->current_position += temp;
553                                 idescsi_discard_data(drive, bcount.all - temp);
554                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
555                                 return ide_started;
556                         }
557 #if IDESCSI_DEBUG_LOG
558                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
559 #endif /* IDESCSI_DEBUG_LOG */
560                 }
561         }
562         if (ireason.b.io) {
563                 clear_bit(PC_WRITING, &pc->flags);
564                 if (pc->sg)
565                         idescsi_input_buffers(drive, pc, bcount.all);
566                 else
567                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
568         } else {
569                 set_bit(PC_WRITING, &pc->flags);
570                 if (pc->sg)
571                         idescsi_output_buffers (drive, pc, bcount.all);
572                 else
573                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
574         }
575         /* Update the current position */
576         pc->actually_transferred += bcount.all;
577         pc->current_position += bcount.all;
578
579         /* And set the interrupt handler again */
580         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
581         return ide_started;
582 }
583
584 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
585 {
586         ide_hwif_t *hwif = drive->hwif;
587         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
588         idescsi_pc_t *pc = scsi->pc;
589         atapi_ireason_t ireason;
590         ide_startstop_t startstop;
591
592         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
593                 printk(KERN_ERR "ide-scsi: Strange, packet command "
594                         "initiated yet DRQ isn't asserted\n");
595                 return startstop;
596         }
597         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
598         if (!ireason.b.cod || ireason.b.io) {
599                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
600                                 "issuing a packet command\n");
601                 return ide_do_reset (drive);
602         }
603         BUG_ON(HWGROUP(drive)->handler != NULL);
604         /* Set the interrupt routine */
605         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
606         /* Send the actual packet */
607         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
608         if (test_bit (PC_DMA_OK, &pc->flags)) {
609                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
610                 hwif->dma_start(drive);
611         }
612         return ide_started;
613 }
614
615 static inline int idescsi_set_direction(idescsi_pc_t *pc)
616 {
617         switch (pc->c[0]) {
618                 case READ_6: case READ_10: case READ_12:
619                         clear_bit(PC_WRITING, &pc->flags);
620                         return 0;
621                 case WRITE_6: case WRITE_10: case WRITE_12:
622                         set_bit(PC_WRITING, &pc->flags);
623                         return 0;
624                 default:
625                         return 1;
626         }
627 }
628
629 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
630 {
631         ide_hwif_t *hwif = drive->hwif;
632         struct scatterlist *sg, *scsi_sg;
633         int segments;
634
635         if (!pc->request_transfer || pc->request_transfer % 1024)
636                 return 1;
637
638         if (idescsi_set_direction(pc))
639                 return 1;
640
641         sg = hwif->sg_table;
642         scsi_sg = pc->scsi_cmd->request_buffer;
643         segments = pc->scsi_cmd->use_sg;
644
645         if (segments > hwif->sg_max_nents)
646                 return 1;
647
648         if (!segments) {
649                 hwif->sg_nents = 1;
650                 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
651         } else {
652                 hwif->sg_nents = segments;
653                 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
654         }
655
656         return 0;
657 }
658
659 /*
660  *      Issue a packet command
661  */
662 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
663 {
664         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
665         ide_hwif_t *hwif = drive->hwif;
666         atapi_feature_t feature;
667         atapi_bcount_t bcount;
668
669         scsi->pc=pc;                                                    /* Set the current packet command */
670         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
671         pc->current_position=pc->buffer;
672         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
673
674         feature.all = 0;
675         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
676                 hwif->sg_mapped = 1;
677                 feature.b.dma = !hwif->dma_setup(drive);
678                 hwif->sg_mapped = 0;
679         }
680
681         SELECT_DRIVE(drive);
682         if (IDE_CONTROL_REG)
683                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
684
685         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
686         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
687         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
688
689         if (feature.b.dma)
690                 set_bit(PC_DMA_OK, &pc->flags);
691
692         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
693                 BUG_ON(HWGROUP(drive)->handler != NULL);
694                 ide_set_handler(drive, &idescsi_transfer_pc,
695                                 get_timeout(pc), idescsi_expiry);
696                 /* Issue the packet command */
697                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
698                 return ide_started;
699         } else {
700                 /* Issue the packet command */
701                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
702                 return idescsi_transfer_pc(drive);
703         }
704 }
705
706 /*
707  *      idescsi_do_request is our request handling function.
708  */
709 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
710 {
711 #if IDESCSI_DEBUG_LOG
712         printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
713         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
714 #endif /* IDESCSI_DEBUG_LOG */
715
716         if (blk_sense_request(rq) || blk_special_request(rq)) {
717                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
718         }
719         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
720         idescsi_end_request (drive, 0, 0);
721         return ide_stopped;
722 }
723
724 static void idescsi_add_settings(ide_drive_t *drive)
725 {
726         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
727
728 /*
729  *                      drive   setting name    read/write      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
730  */
731         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
732         ide_add_setting(drive,  "bios_head",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
733         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
734         ide_add_setting(drive,  "transform",    SETTING_RW,     -1,     -1,             TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
735         ide_add_setting(drive,  "log",          SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
736 }
737
738 /*
739  *      Driver initialization.
740  */
741 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
742 {
743         if (drive->id && (drive->id->config & 0x0060) == 0x20)
744                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
745         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
746         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
747 #if IDESCSI_DEBUG_LOG
748         set_bit(IDESCSI_LOG_CMD, &scsi->log);
749 #endif /* IDESCSI_DEBUG_LOG */
750         idescsi_add_settings(drive);
751 }
752
753 static void ide_scsi_remove(ide_drive_t *drive)
754 {
755         struct Scsi_Host *scsihost = drive->driver_data;
756         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
757         struct gendisk *g = scsi->disk;
758
759         ide_unregister_subdriver(drive, scsi->driver);
760
761         ide_unregister_region(g);
762
763         drive->driver_data = NULL;
764         g->private_data = NULL;
765         put_disk(g);
766
767         scsi_remove_host(scsihost);
768         ide_scsi_put(scsi);
769 }
770
771 static int ide_scsi_probe(ide_drive_t *);
772
773 #ifdef CONFIG_PROC_FS
774 static ide_proc_entry_t idescsi_proc[] = {
775         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
776         { NULL, 0, NULL, NULL }
777 };
778 #else
779 # define idescsi_proc   NULL
780 #endif
781
782 static ide_driver_t idescsi_driver = {
783         .gen_driver = {
784                 .owner          = THIS_MODULE,
785                 .name           = "ide-scsi",
786                 .bus            = &ide_bus_type,
787         },
788         .probe                  = ide_scsi_probe,
789         .remove                 = ide_scsi_remove,
790         .version                = IDESCSI_VERSION,
791         .media                  = ide_scsi,
792         .supports_dsc_overlap   = 0,
793         .proc                   = idescsi_proc,
794         .do_request             = idescsi_do_request,
795         .end_request            = idescsi_end_request,
796         .error                  = idescsi_atapi_error,
797         .abort                  = idescsi_atapi_abort,
798 };
799
800 static int idescsi_ide_open(struct inode *inode, struct file *filp)
801 {
802         struct gendisk *disk = inode->i_bdev->bd_disk;
803         struct ide_scsi_obj *scsi;
804
805         if (!(scsi = ide_scsi_get(disk)))
806                 return -ENXIO;
807
808         return 0;
809 }
810
811 static int idescsi_ide_release(struct inode *inode, struct file *filp)
812 {
813         struct gendisk *disk = inode->i_bdev->bd_disk;
814         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
815
816         ide_scsi_put(scsi);
817
818         return 0;
819 }
820
821 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
822                         unsigned int cmd, unsigned long arg)
823 {
824         struct block_device *bdev = inode->i_bdev;
825         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
826         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
827 }
828
829 static struct block_device_operations idescsi_ops = {
830         .owner          = THIS_MODULE,
831         .open           = idescsi_ide_open,
832         .release        = idescsi_ide_release,
833         .ioctl          = idescsi_ide_ioctl,
834 };
835
836 static int idescsi_slave_configure(struct scsi_device * sdp)
837 {
838         /* Configure detected device */
839         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
840         return 0;
841 }
842
843 static const char *idescsi_info (struct Scsi_Host *host)
844 {
845         return "SCSI host adapter emulation for IDE ATAPI devices";
846 }
847
848 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
849 {
850         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
851
852         if (cmd == SG_SET_TRANSFORM) {
853                 if (arg)
854                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
855                 else
856                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
857                 return 0;
858         } else if (cmd == SG_GET_TRANSFORM)
859                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
860         return -EINVAL;
861 }
862
863 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
864 {
865         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
866
867         /* this was a layering violation and we can't support it
868            anymore, sorry. */
869 #if 0
870         struct gendisk *disk = cmd->request->rq_disk;
871
872         if (disk) {
873                 struct struct scsi_device_Template **p = disk->private_data;
874                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
875                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
876         }
877 #endif
878         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
879 }
880
881 static int idescsi_queue (struct scsi_cmnd *cmd,
882                 void (*done)(struct scsi_cmnd *))
883 {
884         struct Scsi_Host *host = cmd->device->host;
885         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
886         ide_drive_t *drive = scsi->drive;
887         struct request *rq = NULL;
888         idescsi_pc_t *pc = NULL;
889
890         if (!drive) {
891                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
892                 goto abort;
893         }
894         scsi = drive_to_idescsi(drive);
895         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
896         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
897         if (rq == NULL || pc == NULL) {
898                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
899                 goto abort;
900         }
901
902         memset (pc->c, 0, 12);
903         pc->flags = 0;
904         pc->rq = rq;
905         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
906         if (cmd->use_sg) {
907                 pc->buffer = NULL;
908                 pc->sg = cmd->request_buffer;
909         } else {
910                 pc->buffer = cmd->request_buffer;
911                 pc->sg = NULL;
912         }
913         pc->b_count = 0;
914         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
915         pc->scsi_cmd = cmd;
916         pc->done = done;
917         pc->timeout = jiffies + cmd->timeout_per_command;
918
919         if (should_transform(drive, cmd))
920                 set_bit(PC_TRANSFORM, &pc->flags);
921         idescsi_transform_pc1 (drive, pc);
922
923         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
924                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
925                 hexdump(cmd->cmnd, cmd->cmd_len);
926                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
927                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
928                         hexdump(pc->c, 12);
929                 }
930         }
931
932         ide_init_drive_cmd (rq);
933         rq->special = (char *) pc;
934         rq->cmd_type = REQ_TYPE_SPECIAL;
935         spin_unlock_irq(host->host_lock);
936         rq->rq_disk = scsi->disk;
937         (void) ide_do_drive_cmd (drive, rq, ide_end);
938         spin_lock_irq(host->host_lock);
939         return 0;
940 abort:
941         kfree (pc);
942         kfree (rq);
943         cmd->result = DID_ERROR << 16;
944         done(cmd);
945         return 0;
946 }
947
948 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
949 {
950         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
951         ide_drive_t    *drive = scsi->drive;
952         int             busy;
953         int             ret   = FAILED;
954
955         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
956
957         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
958                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
959
960         if (!drive) {
961                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
962                 WARN_ON(1);
963                 goto no_drive;
964         }
965
966         /* First give it some more time, how much is "right" is hard to say :-( */
967
968         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
969         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
970                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
971
972         spin_lock_irq(&ide_lock);
973
974         /* If there is no pc running we're done (our interrupt took care of it) */
975         if (!scsi->pc) {
976                 ret = SUCCESS;
977                 goto ide_unlock;
978         }
979
980         /* It's somewhere in flight. Does ide subsystem agree? */
981         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
982             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
983                 /*
984                  * FIXME - not sure this condition can ever occur
985                  */
986                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
987
988                 if (blk_sense_request(scsi->pc->rq))
989                         kfree(scsi->pc->buffer);
990                 kfree(scsi->pc->rq);
991                 kfree(scsi->pc);
992                 scsi->pc = NULL;
993
994                 ret = SUCCESS;
995         }
996
997 ide_unlock:
998         spin_unlock_irq(&ide_lock);
999 no_drive:
1000         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1001                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
1002
1003         return ret;
1004 }
1005
1006 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
1007 {
1008         struct request *req;
1009         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
1010         ide_drive_t    *drive = scsi->drive;
1011         int             ready = 0;
1012         int             ret   = SUCCESS;
1013
1014         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1015
1016         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1017                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1018
1019         if (!drive) {
1020                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1021                 WARN_ON(1);
1022                 return FAILED;
1023         }
1024
1025         spin_lock_irq(cmd->device->host->host_lock);
1026         spin_lock(&ide_lock);
1027
1028         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1029                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1030                 spin_unlock(&ide_lock);
1031                 spin_unlock_irq(cmd->device->host->host_lock);
1032                 return FAILED;
1033         }
1034
1035         /* kill current request */
1036         blkdev_dequeue_request(req);
1037         end_that_request_last(req, 0);
1038         if (blk_sense_request(req))
1039                 kfree(scsi->pc->buffer);
1040         kfree(scsi->pc);
1041         scsi->pc = NULL;
1042         kfree(req);
1043
1044         /* now nuke the drive queue */
1045         while ((req = elv_next_request(drive->queue))) {
1046                 blkdev_dequeue_request(req);
1047                 end_that_request_last(req, 0);
1048         }
1049
1050         HWGROUP(drive)->rq = NULL;
1051         HWGROUP(drive)->handler = NULL;
1052         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
1053         spin_unlock(&ide_lock);
1054
1055         ide_do_reset(drive);
1056
1057         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1058
1059         do {
1060                 spin_unlock_irq(cmd->device->host->host_lock);
1061                 msleep(50);
1062                 spin_lock_irq(cmd->device->host->host_lock);
1063         } while ( HWGROUP(drive)->handler );
1064
1065         ready = drive_is_ready(drive);
1066         HWGROUP(drive)->busy--;
1067         if (!ready) {
1068                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1069                 ret = FAILED;
1070         }
1071
1072         spin_unlock_irq(cmd->device->host->host_lock);
1073         return ret;
1074 }
1075
1076 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1077                 sector_t capacity, int *parm)
1078 {
1079         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1080         ide_drive_t *drive = idescsi->drive;
1081
1082         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1083                 parm[0] = drive->bios_head;
1084                 parm[1] = drive->bios_sect;
1085                 parm[2] = drive->bios_cyl;
1086         }
1087         return 0;
1088 }
1089
1090 static struct scsi_host_template idescsi_template = {
1091         .module                 = THIS_MODULE,
1092         .name                   = "idescsi",
1093         .info                   = idescsi_info,
1094         .slave_configure        = idescsi_slave_configure,
1095         .ioctl                  = idescsi_ioctl,
1096         .queuecommand           = idescsi_queue,
1097         .eh_abort_handler       = idescsi_eh_abort,
1098         .eh_host_reset_handler  = idescsi_eh_reset,
1099         .bios_param             = idescsi_bios,
1100         .can_queue              = 40,
1101         .this_id                = -1,
1102         .sg_tablesize           = 256,
1103         .cmd_per_lun            = 5,
1104         .max_sectors            = 128,
1105         .use_clustering         = DISABLE_CLUSTERING,
1106         .emulated               = 1,
1107         .proc_name              = "ide-scsi",
1108 };
1109
1110 static int ide_scsi_probe(ide_drive_t *drive)
1111 {
1112         idescsi_scsi_t *idescsi;
1113         struct Scsi_Host *host;
1114         struct gendisk *g;
1115         static int warned;
1116         int err = -ENOMEM;
1117
1118         if (!warned && drive->media == ide_cdrom) {
1119                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1120                 warned = 1;
1121         }
1122
1123         if (idescsi_nocd && drive->media == ide_cdrom)
1124                 return -ENODEV;
1125
1126         if (!strstr("ide-scsi", drive->driver_req) ||
1127             !drive->present ||
1128             drive->media == ide_disk ||
1129             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1130                 return -ENODEV;
1131
1132         g = alloc_disk(1 << PARTN_BITS);
1133         if (!g)
1134                 goto out_host_put;
1135
1136         ide_init_disk(g, drive);
1137
1138         host->max_id = 1;
1139
1140 #if IDESCSI_DEBUG_LOG
1141         if (drive->id->last_lun)
1142                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1143 #endif
1144         if ((drive->id->last_lun & 0x7) != 7)
1145                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1146         else
1147                 host->max_lun = 1;
1148
1149         drive->driver_data = host;
1150         idescsi = scsihost_to_idescsi(host);
1151         idescsi->drive = drive;
1152         idescsi->driver = &idescsi_driver;
1153         idescsi->host = host;
1154         idescsi->disk = g;
1155         g->private_data = &idescsi->driver;
1156         ide_register_subdriver(drive, &idescsi_driver);
1157         err = 0;
1158         idescsi_setup(drive, idescsi);
1159         g->fops = &idescsi_ops;
1160         ide_register_region(g);
1161         err = scsi_add_host(host, &drive->gendev);
1162         if (!err) {
1163                 scsi_scan_host(host);
1164                 return 0;
1165         }
1166         /* fall through on error */
1167         ide_unregister_region(g);
1168         ide_unregister_subdriver(drive, &idescsi_driver);
1169
1170         put_disk(g);
1171 out_host_put:
1172         scsi_host_put(host);
1173         return err;
1174 }
1175
1176 static int __init init_idescsi_module(void)
1177 {
1178         return driver_register(&idescsi_driver.gen_driver);
1179 }
1180
1181 static void __exit exit_idescsi_module(void)
1182 {
1183         driver_unregister(&idescsi_driver.gen_driver);
1184 }
1185
1186 module_param(idescsi_nocd, int, 0600);
1187 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1188 module_init(init_idescsi_module);
1189 module_exit(exit_idescsi_module);
1190 MODULE_LICENSE("GPL");