[PATCH] Split struct request ->flags into two parts
[linux-3.10.git] / 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
114 #define ide_scsi_g(disk) \
115         container_of((disk)->private_data, struct ide_scsi_obj, driver)
116
117 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
118 {
119         struct ide_scsi_obj *scsi = NULL;
120
121         mutex_lock(&idescsi_ref_mutex);
122         scsi = ide_scsi_g(disk);
123         if (scsi)
124                 scsi_host_get(scsi->host);
125         mutex_unlock(&idescsi_ref_mutex);
126         return scsi;
127 }
128
129 static void ide_scsi_put(struct ide_scsi_obj *scsi)
130 {
131         mutex_lock(&idescsi_ref_mutex);
132         scsi_host_put(scsi->host);
133         mutex_unlock(&idescsi_ref_mutex);
134 }
135
136 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
137 {
138         return (idescsi_scsi_t*) (&host[1]);
139 }
140
141 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
142 {
143         return scsihost_to_idescsi(ide_drive->driver_data);
144 }
145
146 /*
147  *      Per ATAPI device status bits.
148  */
149 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
150
151 /*
152  *      ide-scsi requests.
153  */
154 #define IDESCSI_PC_RQ                   90
155
156 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
157 {
158         while (bcount--)
159                 (void) HWIF(drive)->INB(IDE_DATA_REG);
160 }
161
162 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
163 {
164         while (bcount--)
165                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
166 }
167
168 /*
169  *      PIO data transfer routines using the scatter gather table.
170  */
171 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
172 {
173         int count;
174         char *buf;
175
176         while (bcount) {
177                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
178                         printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
179                         idescsi_discard_data (drive, bcount);
180                         return;
181                 }
182                 count = min(pc->sg->length - pc->b_count, bcount);
183                 if (PageHighMem(pc->sg->page)) {
184                         unsigned long flags;
185
186                         local_irq_save(flags);
187                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
188                                         pc->sg->offset;
189                         drive->hwif->atapi_input_bytes(drive,
190                                                 buf + pc->b_count, count);
191                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
192                         local_irq_restore(flags);
193                 } else {
194                         buf = page_address(pc->sg->page) + pc->sg->offset;
195                         drive->hwif->atapi_input_bytes(drive,
196                                                 buf + pc->b_count, count);
197                 }
198                 bcount -= count; pc->b_count += count;
199                 if (pc->b_count == pc->sg->length) {
200                         pc->sg++;
201                         pc->b_count = 0;
202                 }
203         }
204 }
205
206 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
207 {
208         int count;
209         char *buf;
210
211         while (bcount) {
212                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
213                         printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
214                         idescsi_output_zeros (drive, bcount);
215                         return;
216                 }
217                 count = min(pc->sg->length - pc->b_count, bcount);
218                 if (PageHighMem(pc->sg->page)) {
219                         unsigned long flags;
220
221                         local_irq_save(flags);
222                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
223                                                 pc->sg->offset;
224                         drive->hwif->atapi_output_bytes(drive,
225                                                 buf + pc->b_count, count);
226                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
227                         local_irq_restore(flags);
228                 } else {
229                         buf = page_address(pc->sg->page) + pc->sg->offset;
230                         drive->hwif->atapi_output_bytes(drive,
231                                                 buf + pc->b_count, count);
232                 }
233                 bcount -= count; pc->b_count += count;
234                 if (pc->b_count == pc->sg->length) {
235                         pc->sg++;
236                         pc->b_count = 0;
237                 }
238         }
239 }
240
241 /*
242  *      Most of the SCSI commands are supported directly by ATAPI devices.
243  *      idescsi_transform_pc handles the few exceptions.
244  */
245 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
246 {
247         u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
248         char *atapi_buf;
249
250         if (!test_bit(PC_TRANSFORM, &pc->flags))
251                 return;
252         if (drive->media == ide_cdrom || drive->media == ide_optical) {
253                 if (c[0] == READ_6 || c[0] == WRITE_6) {
254                         c[8] = c[4];            c[5] = c[3];            c[4] = c[2];
255                         c[3] = c[1] & 0x1f;     c[2] = 0;               c[1] &= 0xe0;
256                         c[0] += (READ_10 - READ_6);
257                 }
258                 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
259                         unsigned short new_len;
260                         if (!scsi_buf)
261                                 return;
262                         if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
263                                 return;
264                         memset(atapi_buf, 0, pc->buffer_size + 4);
265                         memset (c, 0, 12);
266                         c[0] = sc[0] | 0x40;
267                         c[1] = sc[1];
268                         c[2] = sc[2];
269                         new_len = sc[4] + 4;
270                         c[8] = new_len;
271                         c[7] = new_len >> 8;
272                         c[9] = sc[5];
273                         if (c[0] == MODE_SELECT_10) {
274                                 atapi_buf[1] = scsi_buf[0];     /* Mode data length */
275                                 atapi_buf[2] = scsi_buf[1];     /* Medium type */
276                                 atapi_buf[3] = scsi_buf[2];     /* Device specific parameter */
277                                 atapi_buf[7] = scsi_buf[3];     /* Block descriptor length */
278                                 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
279                         }
280                         pc->buffer = atapi_buf;
281                         pc->request_transfer += 4;
282                         pc->buffer_size += 4;
283                 }
284         }
285 }
286
287 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
288 {
289         u8 *atapi_buf = pc->buffer;
290         u8 *sc = pc->scsi_cmd->cmnd;
291         u8 *scsi_buf = pc->scsi_cmd->request_buffer;
292
293         if (!test_bit(PC_TRANSFORM, &pc->flags))
294                 return;
295         if (drive->media == ide_cdrom || drive->media == ide_optical) {
296                 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
297                         scsi_buf[0] = atapi_buf[1];             /* Mode data length */
298                         scsi_buf[1] = atapi_buf[2];             /* Medium type */
299                         scsi_buf[2] = atapi_buf[3];             /* Device specific parameter */
300                         scsi_buf[3] = atapi_buf[7];             /* Block descriptor length */
301                         memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
302                 }
303                 if (pc->c[0] == INQUIRY) {
304                         scsi_buf[2] |= 2;                       /* ansi_revision */
305                         scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
306                 }
307         }
308         if (atapi_buf && atapi_buf != scsi_buf)
309                 kfree(atapi_buf);
310 }
311
312 static void hexdump(u8 *x, int len)
313 {
314         int i;
315
316         printk("[ ");
317         for (i = 0; i < len; i++)
318                 printk("%x ", x[i]);
319         printk("]\n");
320 }
321
322 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
323 {
324         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
325         idescsi_pc_t   *pc;
326         struct request *rq;
327         u8             *buf;
328
329         /* stuff a sense request in front of our current request */
330         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
331         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
332         buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
333         if (pc == NULL || rq == NULL || buf == NULL) {
334                 kfree(buf);
335                 kfree(rq);
336                 kfree(pc);
337                 return -ENOMEM;
338         }
339         memset (pc, 0, sizeof (idescsi_pc_t));
340         memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
341         ide_init_drive_cmd(rq);
342         rq->special = (char *) pc;
343         pc->rq = rq;
344         pc->buffer = buf;
345         pc->c[0] = REQUEST_SENSE;
346         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
347         rq->cmd_type = REQ_TYPE_SENSE;
348         pc->timeout = jiffies + WAIT_READY;
349         /* NOTE! Save the failed packet command in "rq->buffer" */
350         rq->buffer = (void *) failed_command->special;
351         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
352         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
353                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
354                 hexdump(pc->c, 6);
355         }
356         rq->rq_disk = scsi->disk;
357         return ide_do_drive_cmd(drive, rq, ide_preempt);
358 }
359
360 static int idescsi_end_request(ide_drive_t *, int, int);
361
362 static ide_startstop_t
363 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
364 {
365         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
366                 /* force an abort */
367                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
368
369         rq->errors++;
370
371         idescsi_end_request(drive, 0, 0);
372
373         return ide_stopped;
374 }
375
376 static ide_startstop_t
377 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
378 {
379 #if IDESCSI_DEBUG_LOG
380         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
381                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
382 #endif
383         rq->errors |= ERROR_MAX;
384
385         idescsi_end_request(drive, 0, 0);
386
387         return ide_stopped;
388 }
389
390 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
391 {
392         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
393         struct request *rq = HWGROUP(drive)->rq;
394         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
395         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
396         struct Scsi_Host *host;
397         u8 *scsi_buf;
398         int errors = rq->errors;
399         unsigned long flags;
400
401         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
402                 ide_end_request(drive, uptodate, nrsecs);
403                 return 0;
404         }
405         ide_end_drive_cmd (drive, 0, 0);
406         if (blk_sense_request(rq)) {
407                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
408                 if (log) {
409                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
410                         hexdump(pc->buffer,16);
411                 }
412                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
413                 kfree(pc->buffer);
414                 kfree(pc);
415                 kfree(rq);
416                 pc = opc;
417                 rq = pc->rq;
418                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
419                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
420         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
421                 if (log)
422                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
423                                         drive->name, pc->scsi_cmd->serial_number);
424                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
425         } else if (errors >= ERROR_MAX) {
426                 pc->scsi_cmd->result = DID_ERROR << 16;
427                 if (log)
428                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
429         } else if (errors) {
430                 if (log)
431                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
432                 if (!idescsi_check_condition(drive, rq))
433                         /* we started a request sense, so we'll be back, exit for now */
434                         return 0;
435                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
436         } else {
437                 pc->scsi_cmd->result = DID_OK << 16;
438                 idescsi_transform_pc2 (drive, pc);
439                 if (log) {
440                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
441                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
442                                 printk(", rst = ");
443                                 scsi_buf = pc->scsi_cmd->request_buffer;
444                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
445                         } else printk("\n");
446                 }
447         }
448         host = pc->scsi_cmd->device->host;
449         spin_lock_irqsave(host->host_lock, flags);
450         pc->done(pc->scsi_cmd);
451         spin_unlock_irqrestore(host->host_lock, flags);
452         kfree(pc);
453         kfree(rq);
454         scsi->pc = NULL;
455         return 0;
456 }
457
458 static inline unsigned long get_timeout(idescsi_pc_t *pc)
459 {
460         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
461 }
462
463 static int idescsi_expiry(ide_drive_t *drive)
464 {
465         idescsi_scsi_t *scsi = drive->driver_data;
466         idescsi_pc_t   *pc   = scsi->pc;
467
468 #if IDESCSI_DEBUG_LOG
469         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
470 #endif
471         set_bit(PC_TIMEDOUT, &pc->flags);
472
473         return 0;                                       /* we do not want the ide subsystem to retry */
474 }
475
476 /*
477  *      Our interrupt handler.
478  */
479 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
480 {
481         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
482         idescsi_pc_t *pc=scsi->pc;
483         struct request *rq = pc->rq;
484         atapi_bcount_t bcount;
485         atapi_status_t status;
486         atapi_ireason_t ireason;
487         atapi_feature_t feature;
488
489         unsigned int temp;
490
491 #if IDESCSI_DEBUG_LOG
492         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
493 #endif /* IDESCSI_DEBUG_LOG */
494
495         if (test_bit(PC_TIMEDOUT, &pc->flags)){
496 #if IDESCSI_DEBUG_LOG
497                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
498                                 pc->scsi_cmd->serial_number, jiffies);
499 #endif
500                 /* end this request now - scsi should retry it*/
501                 idescsi_end_request (drive, 1, 0);
502                 return ide_stopped;
503         }
504         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
505 #if IDESCSI_DEBUG_LOG
506                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
507 #endif /* IDESCSI_DEBUG_LOG */
508                 pc->actually_transferred=pc->request_transfer;
509                 (void) HWIF(drive)->ide_dma_end(drive);
510         }
511
512         feature.all = 0;
513         /* Clear the interrupt */
514         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
515
516         if (!status.b.drq) {
517                 /* No more interrupts */
518                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
519                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
520                 local_irq_enable_in_hardirq();
521                 if (status.b.check)
522                         rq->errors++;
523                 idescsi_end_request (drive, 1, 0);
524                 return ide_stopped;
525         }
526         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
527         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
528         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
529
530         if (ireason.b.cod) {
531                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
532                 return ide_do_reset (drive);
533         }
534         if (ireason.b.io) {
535                 temp = pc->actually_transferred + bcount.all;
536                 if (temp > pc->request_transfer) {
537                         if (temp > pc->buffer_size) {
538                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
539                                         "send us more data than expected "
540                                         "- discarding data\n");
541                                 temp = pc->buffer_size - pc->actually_transferred;
542                                 if (temp) {
543                                         clear_bit(PC_WRITING, &pc->flags);
544                                         if (pc->sg)
545                                                 idescsi_input_buffers(drive, pc, temp);
546                                         else
547                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
548                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
549                                 }
550                                 pc->actually_transferred += temp;
551                                 pc->current_position += temp;
552                                 idescsi_discard_data(drive, bcount.all - temp);
553                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
554                                 return ide_started;
555                         }
556 #if IDESCSI_DEBUG_LOG
557                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
558 #endif /* IDESCSI_DEBUG_LOG */
559                 }
560         }
561         if (ireason.b.io) {
562                 clear_bit(PC_WRITING, &pc->flags);
563                 if (pc->sg)
564                         idescsi_input_buffers(drive, pc, bcount.all);
565                 else
566                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
567         } else {
568                 set_bit(PC_WRITING, &pc->flags);
569                 if (pc->sg)
570                         idescsi_output_buffers (drive, pc, bcount.all);
571                 else
572                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
573         }
574         /* Update the current position */
575         pc->actually_transferred += bcount.all;
576         pc->current_position += bcount.all;
577
578         /* And set the interrupt handler again */
579         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
580         return ide_started;
581 }
582
583 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
584 {
585         ide_hwif_t *hwif = drive->hwif;
586         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
587         idescsi_pc_t *pc = scsi->pc;
588         atapi_ireason_t ireason;
589         ide_startstop_t startstop;
590
591         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
592                 printk(KERN_ERR "ide-scsi: Strange, packet command "
593                         "initiated yet DRQ isn't asserted\n");
594                 return startstop;
595         }
596         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
597         if (!ireason.b.cod || ireason.b.io) {
598                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
599                                 "issuing a packet command\n");
600                 return ide_do_reset (drive);
601         }
602         BUG_ON(HWGROUP(drive)->handler != NULL);
603         /* Set the interrupt routine */
604         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
605         /* Send the actual packet */
606         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
607         if (test_bit (PC_DMA_OK, &pc->flags)) {
608                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
609                 hwif->dma_start(drive);
610         }
611         return ide_started;
612 }
613
614 static inline int idescsi_set_direction(idescsi_pc_t *pc)
615 {
616         switch (pc->c[0]) {
617                 case READ_6: case READ_10: case READ_12:
618                         clear_bit(PC_WRITING, &pc->flags);
619                         return 0;
620                 case WRITE_6: case WRITE_10: case WRITE_12:
621                         set_bit(PC_WRITING, &pc->flags);
622                         return 0;
623                 default:
624                         return 1;
625         }
626 }
627
628 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
629 {
630         ide_hwif_t *hwif = drive->hwif;
631         struct scatterlist *sg, *scsi_sg;
632         int segments;
633
634         if (!pc->request_transfer || pc->request_transfer % 1024)
635                 return 1;
636
637         if (idescsi_set_direction(pc))
638                 return 1;
639
640         sg = hwif->sg_table;
641         scsi_sg = pc->scsi_cmd->request_buffer;
642         segments = pc->scsi_cmd->use_sg;
643
644         if (segments > hwif->sg_max_nents)
645                 return 1;
646
647         if (!segments) {
648                 hwif->sg_nents = 1;
649                 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
650         } else {
651                 hwif->sg_nents = segments;
652                 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
653         }
654
655         return 0;
656 }
657
658 /*
659  *      Issue a packet command
660  */
661 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
662 {
663         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
664         ide_hwif_t *hwif = drive->hwif;
665         atapi_feature_t feature;
666         atapi_bcount_t bcount;
667
668         scsi->pc=pc;                                                    /* Set the current packet command */
669         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
670         pc->current_position=pc->buffer;
671         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
672
673         feature.all = 0;
674         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
675                 hwif->sg_mapped = 1;
676                 feature.b.dma = !hwif->dma_setup(drive);
677                 hwif->sg_mapped = 0;
678         }
679
680         SELECT_DRIVE(drive);
681         if (IDE_CONTROL_REG)
682                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
683
684         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
685         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
686         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
687
688         if (feature.b.dma)
689                 set_bit(PC_DMA_OK, &pc->flags);
690
691         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
692                 BUG_ON(HWGROUP(drive)->handler != NULL);
693                 ide_set_handler(drive, &idescsi_transfer_pc,
694                                 get_timeout(pc), idescsi_expiry);
695                 /* Issue the packet command */
696                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
697                 return ide_started;
698         } else {
699                 /* Issue the packet command */
700                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
701                 return idescsi_transfer_pc(drive);
702         }
703 }
704
705 /*
706  *      idescsi_do_request is our request handling function.
707  */
708 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
709 {
710 #if IDESCSI_DEBUG_LOG
711         printk (KERN_INFO "rq_status: %d, dev: %s, cmd: %x, errors: %d\n",rq->rq_status, rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
712         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
713 #endif /* IDESCSI_DEBUG_LOG */
714
715         if (blk_sense_request(rq) || blk_special_request(rq)) {
716                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
717         }
718         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
719         idescsi_end_request (drive, 0, 0);
720         return ide_stopped;
721 }
722
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      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
729  */
730         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
731         ide_add_setting(drive,  "bios_head",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
732         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
733         ide_add_setting(drive,  "transform",    SETTING_RW,     -1,     -1,             TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
734         ide_add_setting(drive,  "log",          SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
735 }
736
737 /*
738  *      Driver initialization.
739  */
740 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
741 {
742         if (drive->id && (drive->id->config & 0x0060) == 0x20)
743                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
744         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
745         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
746 #if IDESCSI_DEBUG_LOG
747         set_bit(IDESCSI_LOG_CMD, &scsi->log);
748 #endif /* IDESCSI_DEBUG_LOG */
749         idescsi_add_settings(drive);
750 }
751
752 static void ide_scsi_remove(ide_drive_t *drive)
753 {
754         struct Scsi_Host *scsihost = drive->driver_data;
755         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
756         struct gendisk *g = scsi->disk;
757
758         ide_unregister_subdriver(drive, scsi->driver);
759
760         ide_unregister_region(g);
761
762         drive->driver_data = NULL;
763         g->private_data = NULL;
764         put_disk(g);
765
766         scsi_remove_host(scsihost);
767         ide_scsi_put(scsi);
768 }
769
770 static int ide_scsi_probe(ide_drive_t *);
771
772 #ifdef CONFIG_PROC_FS
773 static ide_proc_entry_t idescsi_proc[] = {
774         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
775         { NULL, 0, NULL, NULL }
776 };
777 #else
778 # define idescsi_proc   NULL
779 #endif
780
781 static ide_driver_t idescsi_driver = {
782         .gen_driver = {
783                 .owner          = THIS_MODULE,
784                 .name           = "ide-scsi",
785                 .bus            = &ide_bus_type,
786         },
787         .probe                  = ide_scsi_probe,
788         .remove                 = ide_scsi_remove,
789         .version                = IDESCSI_VERSION,
790         .media                  = ide_scsi,
791         .supports_dsc_overlap   = 0,
792         .proc                   = idescsi_proc,
793         .do_request             = idescsi_do_request,
794         .end_request            = idescsi_end_request,
795         .error                  = idescsi_atapi_error,
796         .abort                  = idescsi_atapi_abort,
797 };
798
799 static int idescsi_ide_open(struct inode *inode, struct file *filp)
800 {
801         struct gendisk *disk = inode->i_bdev->bd_disk;
802         struct ide_scsi_obj *scsi;
803         ide_drive_t *drive;
804
805         if (!(scsi = ide_scsi_get(disk)))
806                 return -ENXIO;
807
808         drive = scsi->drive;
809
810         drive->usage++;
811
812         return 0;
813 }
814
815 static int idescsi_ide_release(struct inode *inode, struct file *filp)
816 {
817         struct gendisk *disk = inode->i_bdev->bd_disk;
818         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
819         ide_drive_t *drive = scsi->drive;
820
821         drive->usage--;
822
823         ide_scsi_put(scsi);
824
825         return 0;
826 }
827
828 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
829                         unsigned int cmd, unsigned long arg)
830 {
831         struct block_device *bdev = inode->i_bdev;
832         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
833         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
834 }
835
836 static struct block_device_operations idescsi_ops = {
837         .owner          = THIS_MODULE,
838         .open           = idescsi_ide_open,
839         .release        = idescsi_ide_release,
840         .ioctl          = idescsi_ide_ioctl,
841 };
842
843 static int idescsi_slave_configure(struct scsi_device * sdp)
844 {
845         /* Configure detected device */
846         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
847         return 0;
848 }
849
850 static const char *idescsi_info (struct Scsi_Host *host)
851 {
852         return "SCSI host adapter emulation for IDE ATAPI devices";
853 }
854
855 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
856 {
857         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
858
859         if (cmd == SG_SET_TRANSFORM) {
860                 if (arg)
861                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
862                 else
863                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
864                 return 0;
865         } else if (cmd == SG_GET_TRANSFORM)
866                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
867         return -EINVAL;
868 }
869
870 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
871 {
872         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
873
874         /* this was a layering violation and we can't support it
875            anymore, sorry. */
876 #if 0
877         struct gendisk *disk = cmd->request->rq_disk;
878
879         if (disk) {
880                 struct struct scsi_device_Template **p = disk->private_data;
881                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
882                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
883         }
884 #endif
885         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
886 }
887
888 static int idescsi_queue (struct scsi_cmnd *cmd,
889                 void (*done)(struct scsi_cmnd *))
890 {
891         struct Scsi_Host *host = cmd->device->host;
892         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
893         ide_drive_t *drive = scsi->drive;
894         struct request *rq = NULL;
895         idescsi_pc_t *pc = NULL;
896
897         if (!drive) {
898                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
899                 goto abort;
900         }
901         scsi = drive_to_idescsi(drive);
902         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
903         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
904         if (rq == NULL || pc == NULL) {
905                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
906                 goto abort;
907         }
908
909         memset (pc->c, 0, 12);
910         pc->flags = 0;
911         pc->rq = rq;
912         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
913         if (cmd->use_sg) {
914                 pc->buffer = NULL;
915                 pc->sg = cmd->request_buffer;
916         } else {
917                 pc->buffer = cmd->request_buffer;
918                 pc->sg = NULL;
919         }
920         pc->b_count = 0;
921         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
922         pc->scsi_cmd = cmd;
923         pc->done = done;
924         pc->timeout = jiffies + cmd->timeout_per_command;
925
926         if (should_transform(drive, cmd))
927                 set_bit(PC_TRANSFORM, &pc->flags);
928         idescsi_transform_pc1 (drive, pc);
929
930         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
931                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
932                 hexdump(cmd->cmnd, cmd->cmd_len);
933                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
934                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
935                         hexdump(pc->c, 12);
936                 }
937         }
938
939         ide_init_drive_cmd (rq);
940         rq->special = (char *) pc;
941         rq->cmd_type = REQ_TYPE_SPECIAL;
942         spin_unlock_irq(host->host_lock);
943         rq->rq_disk = scsi->disk;
944         (void) ide_do_drive_cmd (drive, rq, ide_end);
945         spin_lock_irq(host->host_lock);
946         return 0;
947 abort:
948         kfree (pc);
949         kfree (rq);
950         cmd->result = DID_ERROR << 16;
951         done(cmd);
952         return 0;
953 }
954
955 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
956 {
957         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
958         ide_drive_t    *drive = scsi->drive;
959         int             busy;
960         int             ret   = FAILED;
961
962         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
963
964         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
965                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
966
967         if (!drive) {
968                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
969                 WARN_ON(1);
970                 goto no_drive;
971         }
972
973         /* First give it some more time, how much is "right" is hard to say :-( */
974
975         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
976         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
977                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
978
979         spin_lock_irq(&ide_lock);
980
981         /* If there is no pc running we're done (our interrupt took care of it) */
982         if (!scsi->pc) {
983                 ret = SUCCESS;
984                 goto ide_unlock;
985         }
986
987         /* It's somewhere in flight. Does ide subsystem agree? */
988         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
989             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
990                 /*
991                  * FIXME - not sure this condition can ever occur
992                  */
993                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
994
995                 if (blk_sense_request(scsi->pc->rq))
996                         kfree(scsi->pc->buffer);
997                 kfree(scsi->pc->rq);
998                 kfree(scsi->pc);
999                 scsi->pc = NULL;
1000
1001                 ret = SUCCESS;
1002         }
1003
1004 ide_unlock:
1005         spin_unlock_irq(&ide_lock);
1006 no_drive:
1007         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1008                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
1009
1010         return ret;
1011 }
1012
1013 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
1014 {
1015         struct request *req;
1016         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
1017         ide_drive_t    *drive = scsi->drive;
1018         int             ready = 0;
1019         int             ret   = SUCCESS;
1020
1021         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1022
1023         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1024                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1025
1026         if (!drive) {
1027                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1028                 WARN_ON(1);
1029                 return FAILED;
1030         }
1031
1032         spin_lock_irq(cmd->device->host->host_lock);
1033         spin_lock(&ide_lock);
1034
1035         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1036                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1037                 spin_unlock(&ide_lock);
1038                 spin_unlock_irq(cmd->device->host->host_lock);
1039                 return FAILED;
1040         }
1041
1042         /* kill current request */
1043         blkdev_dequeue_request(req);
1044         end_that_request_last(req, 0);
1045         if (blk_sense_request(req))
1046                 kfree(scsi->pc->buffer);
1047         kfree(scsi->pc);
1048         scsi->pc = NULL;
1049         kfree(req);
1050
1051         /* now nuke the drive queue */
1052         while ((req = elv_next_request(drive->queue))) {
1053                 blkdev_dequeue_request(req);
1054                 end_that_request_last(req, 0);
1055         }
1056
1057         HWGROUP(drive)->rq = NULL;
1058         HWGROUP(drive)->handler = NULL;
1059         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
1060         spin_unlock(&ide_lock);
1061
1062         ide_do_reset(drive);
1063
1064         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1065
1066         do {
1067                 spin_unlock_irq(cmd->device->host->host_lock);
1068                 msleep(50);
1069                 spin_lock_irq(cmd->device->host->host_lock);
1070         } while ( HWGROUP(drive)->handler );
1071
1072         ready = drive_is_ready(drive);
1073         HWGROUP(drive)->busy--;
1074         if (!ready) {
1075                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1076                 ret = FAILED;
1077         }
1078
1079         spin_unlock_irq(cmd->device->host->host_lock);
1080         return ret;
1081 }
1082
1083 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1084                 sector_t capacity, int *parm)
1085 {
1086         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1087         ide_drive_t *drive = idescsi->drive;
1088
1089         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1090                 parm[0] = drive->bios_head;
1091                 parm[1] = drive->bios_sect;
1092                 parm[2] = drive->bios_cyl;
1093         }
1094         return 0;
1095 }
1096
1097 static struct scsi_host_template idescsi_template = {
1098         .module                 = THIS_MODULE,
1099         .name                   = "idescsi",
1100         .info                   = idescsi_info,
1101         .slave_configure        = idescsi_slave_configure,
1102         .ioctl                  = idescsi_ioctl,
1103         .queuecommand           = idescsi_queue,
1104         .eh_abort_handler       = idescsi_eh_abort,
1105         .eh_host_reset_handler  = idescsi_eh_reset,
1106         .bios_param             = idescsi_bios,
1107         .can_queue              = 40,
1108         .this_id                = -1,
1109         .sg_tablesize           = 256,
1110         .cmd_per_lun            = 5,
1111         .max_sectors            = 128,
1112         .use_clustering         = DISABLE_CLUSTERING,
1113         .emulated               = 1,
1114         .proc_name              = "ide-scsi",
1115 };
1116
1117 static int ide_scsi_probe(ide_drive_t *drive)
1118 {
1119         idescsi_scsi_t *idescsi;
1120         struct Scsi_Host *host;
1121         struct gendisk *g;
1122         static int warned;
1123         int err = -ENOMEM;
1124
1125         if (!warned && drive->media == ide_cdrom) {
1126                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1127                 warned = 1;
1128         }
1129
1130         if (!strstr("ide-scsi", drive->driver_req) ||
1131             !drive->present ||
1132             drive->media == ide_disk ||
1133             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1134                 return -ENODEV;
1135
1136         g = alloc_disk(1 << PARTN_BITS);
1137         if (!g)
1138                 goto out_host_put;
1139
1140         ide_init_disk(g, drive);
1141
1142         host->max_id = 1;
1143
1144 #if IDESCSI_DEBUG_LOG
1145         if (drive->id->last_lun)
1146                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1147 #endif
1148         if ((drive->id->last_lun & 0x7) != 7)
1149                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1150         else
1151                 host->max_lun = 1;
1152
1153         drive->driver_data = host;
1154         idescsi = scsihost_to_idescsi(host);
1155         idescsi->drive = drive;
1156         idescsi->driver = &idescsi_driver;
1157         idescsi->host = host;
1158         idescsi->disk = g;
1159         g->private_data = &idescsi->driver;
1160         ide_register_subdriver(drive, &idescsi_driver);
1161         err = 0;
1162         idescsi_setup(drive, idescsi);
1163         g->fops = &idescsi_ops;
1164         ide_register_region(g);
1165         err = scsi_add_host(host, &drive->gendev);
1166         if (!err) {
1167                 scsi_scan_host(host);
1168                 return 0;
1169         }
1170         /* fall through on error */
1171         ide_unregister_region(g);
1172         ide_unregister_subdriver(drive, &idescsi_driver);
1173
1174         put_disk(g);
1175 out_host_put:
1176         scsi_host_put(host);
1177         return err;
1178 }
1179
1180 static int __init init_idescsi_module(void)
1181 {
1182         return driver_register(&idescsi_driver.gen_driver);
1183 }
1184
1185 static void __exit exit_idescsi_module(void)
1186 {
1187         driver_unregister(&idescsi_driver.gen_driver);
1188 }
1189
1190 module_init(init_idescsi_module);
1191 module_exit(exit_idescsi_module);
1192 MODULE_LICENSE("GPL");