Pull bugzilla-3774 into release branch
[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 = kzalloc(sizeof(idescsi_pc_t), GFP_ATOMIC);
332         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
333         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
334         if (!pc || !rq || !buf) {
335                 kfree(buf);
336                 kfree(rq);
337                 kfree(pc);
338                 return -ENOMEM;
339         }
340         ide_init_drive_cmd(rq);
341         rq->special = (char *) pc;
342         pc->rq = rq;
343         pc->buffer = buf;
344         pc->c[0] = REQUEST_SENSE;
345         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
346         rq->cmd_type = REQ_TYPE_SENSE;
347         pc->timeout = jiffies + WAIT_READY;
348         /* NOTE! Save the failed packet command in "rq->buffer" */
349         rq->buffer = (void *) failed_command->special;
350         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
351         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
352                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
353                 hexdump(pc->c, 6);
354         }
355         rq->rq_disk = scsi->disk;
356         return ide_do_drive_cmd(drive, rq, ide_preempt);
357 }
358
359 static int idescsi_end_request(ide_drive_t *, int, int);
360
361 static ide_startstop_t
362 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
363 {
364         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
365                 /* force an abort */
366                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
367
368         rq->errors++;
369
370         idescsi_end_request(drive, 0, 0);
371
372         return ide_stopped;
373 }
374
375 static ide_startstop_t
376 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
377 {
378 #if IDESCSI_DEBUG_LOG
379         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
380                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
381 #endif
382         rq->errors |= ERROR_MAX;
383
384         idescsi_end_request(drive, 0, 0);
385
386         return ide_stopped;
387 }
388
389 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
390 {
391         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
392         struct request *rq = HWGROUP(drive)->rq;
393         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
394         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
395         struct Scsi_Host *host;
396         u8 *scsi_buf;
397         int errors = rq->errors;
398         unsigned long flags;
399
400         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
401                 ide_end_request(drive, uptodate, nrsecs);
402                 return 0;
403         }
404         ide_end_drive_cmd (drive, 0, 0);
405         if (blk_sense_request(rq)) {
406                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
407                 if (log) {
408                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
409                         hexdump(pc->buffer,16);
410                 }
411                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
412                 kfree(pc->buffer);
413                 kfree(pc);
414                 kfree(rq);
415                 pc = opc;
416                 rq = pc->rq;
417                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
418                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
419         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
420                 if (log)
421                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
422                                         drive->name, pc->scsi_cmd->serial_number);
423                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
424         } else if (errors >= ERROR_MAX) {
425                 pc->scsi_cmd->result = DID_ERROR << 16;
426                 if (log)
427                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
428         } else if (errors) {
429                 if (log)
430                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
431                 if (!idescsi_check_condition(drive, rq))
432                         /* we started a request sense, so we'll be back, exit for now */
433                         return 0;
434                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
435         } else {
436                 pc->scsi_cmd->result = DID_OK << 16;
437                 idescsi_transform_pc2 (drive, pc);
438                 if (log) {
439                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
440                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
441                                 printk(", rst = ");
442                                 scsi_buf = pc->scsi_cmd->request_buffer;
443                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
444                         } else printk("\n");
445                 }
446         }
447         host = pc->scsi_cmd->device->host;
448         spin_lock_irqsave(host->host_lock, flags);
449         pc->done(pc->scsi_cmd);
450         spin_unlock_irqrestore(host->host_lock, flags);
451         kfree(pc);
452         kfree(rq);
453         scsi->pc = NULL;
454         return 0;
455 }
456
457 static inline unsigned long get_timeout(idescsi_pc_t *pc)
458 {
459         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
460 }
461
462 static int idescsi_expiry(ide_drive_t *drive)
463 {
464         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
465         idescsi_pc_t   *pc   = scsi->pc;
466
467 #if IDESCSI_DEBUG_LOG
468         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
469 #endif
470         set_bit(PC_TIMEDOUT, &pc->flags);
471
472         return 0;                                       /* we do not want the ide subsystem to retry */
473 }
474
475 /*
476  *      Our interrupt handler.
477  */
478 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
479 {
480         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
481         idescsi_pc_t *pc=scsi->pc;
482         struct request *rq = pc->rq;
483         atapi_bcount_t bcount;
484         atapi_status_t status;
485         atapi_ireason_t ireason;
486         atapi_feature_t feature;
487
488         unsigned int temp;
489
490 #if IDESCSI_DEBUG_LOG
491         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
492 #endif /* IDESCSI_DEBUG_LOG */
493
494         if (test_bit(PC_TIMEDOUT, &pc->flags)){
495 #if IDESCSI_DEBUG_LOG
496                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
497                                 pc->scsi_cmd->serial_number, jiffies);
498 #endif
499                 /* end this request now - scsi should retry it*/
500                 idescsi_end_request (drive, 1, 0);
501                 return ide_stopped;
502         }
503         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
504 #if IDESCSI_DEBUG_LOG
505                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
506 #endif /* IDESCSI_DEBUG_LOG */
507                 pc->actually_transferred=pc->request_transfer;
508                 (void) HWIF(drive)->ide_dma_end(drive);
509         }
510
511         feature.all = 0;
512         /* Clear the interrupt */
513         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
514
515         if (!status.b.drq) {
516                 /* No more interrupts */
517                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
518                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
519                 local_irq_enable_in_hardirq();
520                 if (status.b.check)
521                         rq->errors++;
522                 idescsi_end_request (drive, 1, 0);
523                 return ide_stopped;
524         }
525         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
526         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
527         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
528
529         if (ireason.b.cod) {
530                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
531                 return ide_do_reset (drive);
532         }
533         if (ireason.b.io) {
534                 temp = pc->actually_transferred + bcount.all;
535                 if (temp > pc->request_transfer) {
536                         if (temp > pc->buffer_size) {
537                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
538                                         "send us more data than expected "
539                                         "- discarding data\n");
540                                 temp = pc->buffer_size - pc->actually_transferred;
541                                 if (temp) {
542                                         clear_bit(PC_WRITING, &pc->flags);
543                                         if (pc->sg)
544                                                 idescsi_input_buffers(drive, pc, temp);
545                                         else
546                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
547                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
548                                 }
549                                 pc->actually_transferred += temp;
550                                 pc->current_position += temp;
551                                 idescsi_discard_data(drive, bcount.all - temp);
552                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
553                                 return ide_started;
554                         }
555 #if IDESCSI_DEBUG_LOG
556                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
557 #endif /* IDESCSI_DEBUG_LOG */
558                 }
559         }
560         if (ireason.b.io) {
561                 clear_bit(PC_WRITING, &pc->flags);
562                 if (pc->sg)
563                         idescsi_input_buffers(drive, pc, bcount.all);
564                 else
565                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
566         } else {
567                 set_bit(PC_WRITING, &pc->flags);
568                 if (pc->sg)
569                         idescsi_output_buffers (drive, pc, bcount.all);
570                 else
571                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
572         }
573         /* Update the current position */
574         pc->actually_transferred += bcount.all;
575         pc->current_position += bcount.all;
576
577         /* And set the interrupt handler again */
578         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
579         return ide_started;
580 }
581
582 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
583 {
584         ide_hwif_t *hwif = drive->hwif;
585         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
586         idescsi_pc_t *pc = scsi->pc;
587         atapi_ireason_t ireason;
588         ide_startstop_t startstop;
589
590         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
591                 printk(KERN_ERR "ide-scsi: Strange, packet command "
592                         "initiated yet DRQ isn't asserted\n");
593                 return startstop;
594         }
595         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
596         if (!ireason.b.cod || ireason.b.io) {
597                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
598                                 "issuing a packet command\n");
599                 return ide_do_reset (drive);
600         }
601         BUG_ON(HWGROUP(drive)->handler != NULL);
602         /* Set the interrupt routine */
603         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
604         /* Send the actual packet */
605         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
606         if (test_bit (PC_DMA_OK, &pc->flags)) {
607                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
608                 hwif->dma_start(drive);
609         }
610         return ide_started;
611 }
612
613 static inline int idescsi_set_direction(idescsi_pc_t *pc)
614 {
615         switch (pc->c[0]) {
616                 case READ_6: case READ_10: case READ_12:
617                         clear_bit(PC_WRITING, &pc->flags);
618                         return 0;
619                 case WRITE_6: case WRITE_10: case WRITE_12:
620                         set_bit(PC_WRITING, &pc->flags);
621                         return 0;
622                 default:
623                         return 1;
624         }
625 }
626
627 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
628 {
629         ide_hwif_t *hwif = drive->hwif;
630         struct scatterlist *sg, *scsi_sg;
631         int segments;
632
633         if (!pc->request_transfer || pc->request_transfer % 1024)
634                 return 1;
635
636         if (idescsi_set_direction(pc))
637                 return 1;
638
639         sg = hwif->sg_table;
640         scsi_sg = pc->scsi_cmd->request_buffer;
641         segments = pc->scsi_cmd->use_sg;
642
643         if (segments > hwif->sg_max_nents)
644                 return 1;
645
646         if (!segments) {
647                 hwif->sg_nents = 1;
648                 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
649         } else {
650                 hwif->sg_nents = segments;
651                 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
652         }
653
654         return 0;
655 }
656
657 /*
658  *      Issue a packet command
659  */
660 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
661 {
662         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
663         ide_hwif_t *hwif = drive->hwif;
664         atapi_feature_t feature;
665         atapi_bcount_t bcount;
666
667         scsi->pc=pc;                                                    /* Set the current packet command */
668         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
669         pc->current_position=pc->buffer;
670         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
671
672         feature.all = 0;
673         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
674                 hwif->sg_mapped = 1;
675                 feature.b.dma = !hwif->dma_setup(drive);
676                 hwif->sg_mapped = 0;
677         }
678
679         SELECT_DRIVE(drive);
680         if (IDE_CONTROL_REG)
681                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
682
683         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
684         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
685         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
686
687         if (feature.b.dma)
688                 set_bit(PC_DMA_OK, &pc->flags);
689
690         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
691                 BUG_ON(HWGROUP(drive)->handler != NULL);
692                 ide_set_handler(drive, &idescsi_transfer_pc,
693                                 get_timeout(pc), idescsi_expiry);
694                 /* Issue the packet command */
695                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
696                 return ide_started;
697         } else {
698                 /* Issue the packet command */
699                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
700                 return idescsi_transfer_pc(drive);
701         }
702 }
703
704 /*
705  *      idescsi_do_request is our request handling function.
706  */
707 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
708 {
709 #if IDESCSI_DEBUG_LOG
710         printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
711         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
712 #endif /* IDESCSI_DEBUG_LOG */
713
714         if (blk_sense_request(rq) || blk_special_request(rq)) {
715                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
716         }
717         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
718         idescsi_end_request (drive, 0, 0);
719         return ide_stopped;
720 }
721
722 #ifdef CONFIG_IDE_PROC_FS
723 static void idescsi_add_settings(ide_drive_t *drive)
724 {
725         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
726
727 /*
728  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
729  */
730         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
731         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
732         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
733         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
734         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
735 }
736 #else
737 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
738 #endif
739
740 /*
741  *      Driver initialization.
742  */
743 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
744 {
745         if (drive->id && (drive->id->config & 0x0060) == 0x20)
746                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
747         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
748         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
749 #if IDESCSI_DEBUG_LOG
750         set_bit(IDESCSI_LOG_CMD, &scsi->log);
751 #endif /* IDESCSI_DEBUG_LOG */
752         idescsi_add_settings(drive);
753 }
754
755 static void ide_scsi_remove(ide_drive_t *drive)
756 {
757         struct Scsi_Host *scsihost = drive->driver_data;
758         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
759         struct gendisk *g = scsi->disk;
760
761         ide_proc_unregister_driver(drive, scsi->driver);
762
763         ide_unregister_region(g);
764
765         drive->driver_data = NULL;
766         g->private_data = NULL;
767         put_disk(g);
768
769         scsi_remove_host(scsihost);
770         ide_scsi_put(scsi);
771 }
772
773 static int ide_scsi_probe(ide_drive_t *);
774
775 #ifdef CONFIG_IDE_PROC_FS
776 static ide_proc_entry_t idescsi_proc[] = {
777         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
778         { NULL, 0, NULL, NULL }
779 };
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         .do_request             = idescsi_do_request,
794         .end_request            = idescsi_end_request,
795         .error                  = idescsi_atapi_error,
796         .abort                  = idescsi_atapi_abort,
797 #ifdef CONFIG_IDE_PROC_FS
798         .proc                   = idescsi_proc,
799 #endif
800 };
801
802 static int idescsi_ide_open(struct inode *inode, struct file *filp)
803 {
804         struct gendisk *disk = inode->i_bdev->bd_disk;
805         struct ide_scsi_obj *scsi;
806
807         if (!(scsi = ide_scsi_get(disk)))
808                 return -ENXIO;
809
810         return 0;
811 }
812
813 static int idescsi_ide_release(struct inode *inode, struct file *filp)
814 {
815         struct gendisk *disk = inode->i_bdev->bd_disk;
816         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
817
818         ide_scsi_put(scsi);
819
820         return 0;
821 }
822
823 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
824                         unsigned int cmd, unsigned long arg)
825 {
826         struct block_device *bdev = inode->i_bdev;
827         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
828         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
829 }
830
831 static struct block_device_operations idescsi_ops = {
832         .owner          = THIS_MODULE,
833         .open           = idescsi_ide_open,
834         .release        = idescsi_ide_release,
835         .ioctl          = idescsi_ide_ioctl,
836 };
837
838 static int idescsi_slave_configure(struct scsi_device * sdp)
839 {
840         /* Configure detected device */
841         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
842         return 0;
843 }
844
845 static const char *idescsi_info (struct Scsi_Host *host)
846 {
847         return "SCSI host adapter emulation for IDE ATAPI devices";
848 }
849
850 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
851 {
852         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
853
854         if (cmd == SG_SET_TRANSFORM) {
855                 if (arg)
856                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
857                 else
858                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
859                 return 0;
860         } else if (cmd == SG_GET_TRANSFORM)
861                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
862         return -EINVAL;
863 }
864
865 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
866 {
867         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
868
869         /* this was a layering violation and we can't support it
870            anymore, sorry. */
871 #if 0
872         struct gendisk *disk = cmd->request->rq_disk;
873
874         if (disk) {
875                 struct struct scsi_device_Template **p = disk->private_data;
876                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
877                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
878         }
879 #endif
880         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
881 }
882
883 static int idescsi_queue (struct scsi_cmnd *cmd,
884                 void (*done)(struct scsi_cmnd *))
885 {
886         struct Scsi_Host *host = cmd->device->host;
887         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
888         ide_drive_t *drive = scsi->drive;
889         struct request *rq = NULL;
890         idescsi_pc_t *pc = NULL;
891
892         if (!drive) {
893                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
894                 goto abort;
895         }
896         scsi = drive_to_idescsi(drive);
897         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
898         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
899         if (rq == NULL || pc == NULL) {
900                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
901                 goto abort;
902         }
903
904         memset (pc->c, 0, 12);
905         pc->flags = 0;
906         pc->rq = rq;
907         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
908         if (cmd->use_sg) {
909                 pc->buffer = NULL;
910                 pc->sg = cmd->request_buffer;
911         } else {
912                 pc->buffer = cmd->request_buffer;
913                 pc->sg = NULL;
914         }
915         pc->b_count = 0;
916         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
917         pc->scsi_cmd = cmd;
918         pc->done = done;
919         pc->timeout = jiffies + cmd->timeout_per_command;
920
921         if (should_transform(drive, cmd))
922                 set_bit(PC_TRANSFORM, &pc->flags);
923         idescsi_transform_pc1 (drive, pc);
924
925         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
926                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
927                 hexdump(cmd->cmnd, cmd->cmd_len);
928                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
929                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
930                         hexdump(pc->c, 12);
931                 }
932         }
933
934         ide_init_drive_cmd (rq);
935         rq->special = (char *) pc;
936         rq->cmd_type = REQ_TYPE_SPECIAL;
937         spin_unlock_irq(host->host_lock);
938         rq->rq_disk = scsi->disk;
939         (void) ide_do_drive_cmd (drive, rq, ide_end);
940         spin_lock_irq(host->host_lock);
941         return 0;
942 abort:
943         kfree (pc);
944         kfree (rq);
945         cmd->result = DID_ERROR << 16;
946         done(cmd);
947         return 0;
948 }
949
950 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
951 {
952         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
953         ide_drive_t    *drive = scsi->drive;
954         int             busy;
955         int             ret   = FAILED;
956
957         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
958
959         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
960                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
961
962         if (!drive) {
963                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
964                 WARN_ON(1);
965                 goto no_drive;
966         }
967
968         /* First give it some more time, how much is "right" is hard to say :-( */
969
970         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
971         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
972                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
973
974         spin_lock_irq(&ide_lock);
975
976         /* If there is no pc running we're done (our interrupt took care of it) */
977         if (!scsi->pc) {
978                 ret = SUCCESS;
979                 goto ide_unlock;
980         }
981
982         /* It's somewhere in flight. Does ide subsystem agree? */
983         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
984             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
985                 /*
986                  * FIXME - not sure this condition can ever occur
987                  */
988                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
989
990                 if (blk_sense_request(scsi->pc->rq))
991                         kfree(scsi->pc->buffer);
992                 kfree(scsi->pc->rq);
993                 kfree(scsi->pc);
994                 scsi->pc = NULL;
995
996                 ret = SUCCESS;
997         }
998
999 ide_unlock:
1000         spin_unlock_irq(&ide_lock);
1001 no_drive:
1002         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1003                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
1004
1005         return ret;
1006 }
1007
1008 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
1009 {
1010         struct request *req;
1011         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
1012         ide_drive_t    *drive = scsi->drive;
1013         int             ready = 0;
1014         int             ret   = SUCCESS;
1015
1016         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1017
1018         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1019                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1020
1021         if (!drive) {
1022                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1023                 WARN_ON(1);
1024                 return FAILED;
1025         }
1026
1027         spin_lock_irq(cmd->device->host->host_lock);
1028         spin_lock(&ide_lock);
1029
1030         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1031                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1032                 spin_unlock(&ide_lock);
1033                 spin_unlock_irq(cmd->device->host->host_lock);
1034                 return FAILED;
1035         }
1036
1037         /* kill current request */
1038         blkdev_dequeue_request(req);
1039         end_that_request_last(req, 0);
1040         if (blk_sense_request(req))
1041                 kfree(scsi->pc->buffer);
1042         kfree(scsi->pc);
1043         scsi->pc = NULL;
1044         kfree(req);
1045
1046         /* now nuke the drive queue */
1047         while ((req = elv_next_request(drive->queue))) {
1048                 blkdev_dequeue_request(req);
1049                 end_that_request_last(req, 0);
1050         }
1051
1052         HWGROUP(drive)->rq = NULL;
1053         HWGROUP(drive)->handler = NULL;
1054         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
1055         spin_unlock(&ide_lock);
1056
1057         ide_do_reset(drive);
1058
1059         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1060
1061         do {
1062                 spin_unlock_irq(cmd->device->host->host_lock);
1063                 msleep(50);
1064                 spin_lock_irq(cmd->device->host->host_lock);
1065         } while ( HWGROUP(drive)->handler );
1066
1067         ready = drive_is_ready(drive);
1068         HWGROUP(drive)->busy--;
1069         if (!ready) {
1070                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1071                 ret = FAILED;
1072         }
1073
1074         spin_unlock_irq(cmd->device->host->host_lock);
1075         return ret;
1076 }
1077
1078 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1079                 sector_t capacity, int *parm)
1080 {
1081         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1082         ide_drive_t *drive = idescsi->drive;
1083
1084         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1085                 parm[0] = drive->bios_head;
1086                 parm[1] = drive->bios_sect;
1087                 parm[2] = drive->bios_cyl;
1088         }
1089         return 0;
1090 }
1091
1092 static struct scsi_host_template idescsi_template = {
1093         .module                 = THIS_MODULE,
1094         .name                   = "idescsi",
1095         .info                   = idescsi_info,
1096         .slave_configure        = idescsi_slave_configure,
1097         .ioctl                  = idescsi_ioctl,
1098         .queuecommand           = idescsi_queue,
1099         .eh_abort_handler       = idescsi_eh_abort,
1100         .eh_host_reset_handler  = idescsi_eh_reset,
1101         .bios_param             = idescsi_bios,
1102         .can_queue              = 40,
1103         .this_id                = -1,
1104         .sg_tablesize           = 256,
1105         .cmd_per_lun            = 5,
1106         .max_sectors            = 128,
1107         .use_clustering         = DISABLE_CLUSTERING,
1108         .emulated               = 1,
1109         .proc_name              = "ide-scsi",
1110 };
1111
1112 static int ide_scsi_probe(ide_drive_t *drive)
1113 {
1114         idescsi_scsi_t *idescsi;
1115         struct Scsi_Host *host;
1116         struct gendisk *g;
1117         static int warned;
1118         int err = -ENOMEM;
1119
1120         if (!warned && drive->media == ide_cdrom) {
1121                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1122                 warned = 1;
1123         }
1124
1125         if (idescsi_nocd && drive->media == ide_cdrom)
1126                 return -ENODEV;
1127
1128         if (!strstr("ide-scsi", drive->driver_req) ||
1129             !drive->present ||
1130             drive->media == ide_disk ||
1131             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1132                 return -ENODEV;
1133
1134         g = alloc_disk(1 << PARTN_BITS);
1135         if (!g)
1136                 goto out_host_put;
1137
1138         ide_init_disk(g, drive);
1139
1140         host->max_id = 1;
1141
1142 #if IDESCSI_DEBUG_LOG
1143         if (drive->id->last_lun)
1144                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1145 #endif
1146         if ((drive->id->last_lun & 0x7) != 7)
1147                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1148         else
1149                 host->max_lun = 1;
1150
1151         drive->driver_data = host;
1152         idescsi = scsihost_to_idescsi(host);
1153         idescsi->drive = drive;
1154         idescsi->driver = &idescsi_driver;
1155         idescsi->host = host;
1156         idescsi->disk = g;
1157         g->private_data = &idescsi->driver;
1158         ide_proc_register_driver(drive, &idescsi_driver);
1159         err = 0;
1160         idescsi_setup(drive, idescsi);
1161         g->fops = &idescsi_ops;
1162         ide_register_region(g);
1163         err = scsi_add_host(host, &drive->gendev);
1164         if (!err) {
1165                 scsi_scan_host(host);
1166                 return 0;
1167         }
1168         /* fall through on error */
1169         ide_unregister_region(g);
1170         ide_proc_unregister_driver(drive, &idescsi_driver);
1171
1172         put_disk(g);
1173 out_host_put:
1174         scsi_host_put(host);
1175         return err;
1176 }
1177
1178 static int __init init_idescsi_module(void)
1179 {
1180         return driver_register(&idescsi_driver.gen_driver);
1181 }
1182
1183 static void __exit exit_idescsi_module(void)
1184 {
1185         driver_unregister(&idescsi_driver.gen_driver);
1186 }
1187
1188 module_param(idescsi_nocd, int, 0600);
1189 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1190 module_init(init_idescsi_module);
1191 module_exit(exit_idescsi_module);
1192 MODULE_LICENSE("GPL");