Automatic merge of /spare/repo/netdev-2.6 branch pcnet32
[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/config.h>
38 #include <linux/types.h>
39 #include <linux/string.h>
40 #include <linux/kernel.h>
41 #include <linux/mm.h>
42 #include <linux/ioport.h>
43 #include <linux/blkdev.h>
44 #include <linux/errno.h>
45 #include <linux/hdreg.h>
46 #include <linux/slab.h>
47 #include <linux/ide.h>
48 #include <linux/scatterlist.h>
49
50 #include <asm/io.h>
51 #include <asm/bitops.h>
52 #include <asm/uaccess.h>
53
54 #include <scsi/scsi.h>
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_device.h>
57 #include <scsi/scsi_host.h>
58 #include <scsi/scsi_tcq.h>
59 #include <scsi/sg.h>
60
61 #define IDESCSI_DEBUG_LOG               0
62
63 typedef struct idescsi_pc_s {
64         u8 c[12];                               /* Actual packet bytes */
65         int request_transfer;                   /* Bytes to transfer */
66         int actually_transferred;               /* Bytes actually transferred */
67         int buffer_size;                        /* Size of our data buffer */
68         struct request *rq;                     /* The corresponding request */
69         u8 *buffer;                             /* Data buffer */
70         u8 *current_position;                   /* Pointer into the above buffer */
71         struct scatterlist *sg;                 /* Scatter gather table */
72         int b_count;                            /* Bytes transferred from current entry */
73         struct scsi_cmnd *scsi_cmd;             /* SCSI command */
74         void (*done)(struct scsi_cmnd *);       /* Scsi completion routine */
75         unsigned long flags;                    /* Status/Action flags */
76         unsigned long timeout;                  /* Command timeout */
77 } idescsi_pc_t;
78
79 /*
80  *      Packet command status bits.
81  */
82 #define PC_DMA_IN_PROGRESS              0       /* 1 while DMA in progress */
83 #define PC_WRITING                      1       /* Data direction */
84 #define PC_TRANSFORM                    2       /* transform SCSI commands */
85 #define PC_TIMEDOUT                     3       /* command timed out */
86 #define PC_DMA_OK                       4       /* Use DMA */
87
88 /*
89  *      SCSI command transformation layer
90  */
91 #define IDESCSI_TRANSFORM               0       /* Enable/Disable transformation */
92 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
93
94 /*
95  *      Log flags
96  */
97 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
98
99 typedef struct ide_scsi_obj {
100         ide_drive_t             *drive;
101         ide_driver_t            *driver;
102         struct gendisk          *disk;
103         struct Scsi_Host        *host;
104
105         idescsi_pc_t *pc;                       /* Current packet command */
106         unsigned long flags;                    /* Status/Action flags */
107         unsigned long transform;                /* SCSI cmd translation layer */
108         unsigned long log;                      /* log flags */
109 } idescsi_scsi_t;
110
111 static DECLARE_MUTEX(idescsi_ref_sem);
112
113 #define ide_scsi_g(disk) \
114         container_of((disk)->private_data, struct ide_scsi_obj, driver)
115
116 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
117 {
118         struct ide_scsi_obj *scsi = NULL;
119
120         down(&idescsi_ref_sem);
121         scsi = ide_scsi_g(disk);
122         if (scsi)
123                 scsi_host_get(scsi->host);
124         up(&idescsi_ref_sem);
125         return scsi;
126 }
127
128 static void ide_scsi_put(struct ide_scsi_obj *scsi)
129 {
130         down(&idescsi_ref_sem);
131         scsi_host_put(scsi->host);
132         up(&idescsi_ref_sem);
133 }
134
135 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
136 {
137         return (idescsi_scsi_t*) (&host[1]);
138 }
139
140 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
141 {
142         return scsihost_to_idescsi(ide_drive->driver_data);
143 }
144
145 /*
146  *      Per ATAPI device status bits.
147  */
148 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
149
150 /*
151  *      ide-scsi requests.
152  */
153 #define IDESCSI_PC_RQ                   90
154
155 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
156 {
157         while (bcount--)
158                 (void) HWIF(drive)->INB(IDE_DATA_REG);
159 }
160
161 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
162 {
163         while (bcount--)
164                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
165 }
166
167 /*
168  *      PIO data transfer routines using the scatter gather table.
169  */
170 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
171 {
172         int count;
173         char *buf;
174
175         while (bcount) {
176                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
177                         printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
178                         idescsi_discard_data (drive, bcount);
179                         return;
180                 }
181                 count = min(pc->sg->length - pc->b_count, bcount);
182                 buf = page_address(pc->sg->page) + pc->sg->offset;
183                 drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
184                 bcount -= count; pc->b_count += count;
185                 if (pc->b_count == pc->sg->length) {
186                         pc->sg++;
187                         pc->b_count = 0;
188                 }
189         }
190 }
191
192 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
193 {
194         int count;
195         char *buf;
196
197         while (bcount) {
198                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
199                         printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
200                         idescsi_output_zeros (drive, bcount);
201                         return;
202                 }
203                 count = min(pc->sg->length - pc->b_count, bcount);
204                 buf = page_address(pc->sg->page) + pc->sg->offset;
205                 drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
206                 bcount -= count; pc->b_count += count;
207                 if (pc->b_count == pc->sg->length) {
208                         pc->sg++;
209                         pc->b_count = 0;
210                 }
211         }
212 }
213
214 /*
215  *      Most of the SCSI commands are supported directly by ATAPI devices.
216  *      idescsi_transform_pc handles the few exceptions.
217  */
218 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
219 {
220         u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
221         char *atapi_buf;
222
223         if (!test_bit(PC_TRANSFORM, &pc->flags))
224                 return;
225         if (drive->media == ide_cdrom || drive->media == ide_optical) {
226                 if (c[0] == READ_6 || c[0] == WRITE_6) {
227                         c[8] = c[4];            c[5] = c[3];            c[4] = c[2];
228                         c[3] = c[1] & 0x1f;     c[2] = 0;               c[1] &= 0xe0;
229                         c[0] += (READ_10 - READ_6);
230                 }
231                 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
232                         unsigned short new_len;
233                         if (!scsi_buf)
234                                 return;
235                         if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
236                                 return;
237                         memset(atapi_buf, 0, pc->buffer_size + 4);
238                         memset (c, 0, 12);
239                         c[0] = sc[0] | 0x40;
240                         c[1] = sc[1];
241                         c[2] = sc[2];
242                         new_len = sc[4] + 4;
243                         c[8] = new_len;
244                         c[7] = new_len >> 8;
245                         c[9] = sc[5];
246                         if (c[0] == MODE_SELECT_10) {
247                                 atapi_buf[1] = scsi_buf[0];     /* Mode data length */
248                                 atapi_buf[2] = scsi_buf[1];     /* Medium type */
249                                 atapi_buf[3] = scsi_buf[2];     /* Device specific parameter */
250                                 atapi_buf[7] = scsi_buf[3];     /* Block descriptor length */
251                                 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
252                         }
253                         pc->buffer = atapi_buf;
254                         pc->request_transfer += 4;
255                         pc->buffer_size += 4;
256                 }
257         }
258 }
259
260 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
261 {
262         u8 *atapi_buf = pc->buffer;
263         u8 *sc = pc->scsi_cmd->cmnd;
264         u8 *scsi_buf = pc->scsi_cmd->request_buffer;
265
266         if (!test_bit(PC_TRANSFORM, &pc->flags))
267                 return;
268         if (drive->media == ide_cdrom || drive->media == ide_optical) {
269                 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
270                         scsi_buf[0] = atapi_buf[1];             /* Mode data length */
271                         scsi_buf[1] = atapi_buf[2];             /* Medium type */
272                         scsi_buf[2] = atapi_buf[3];             /* Device specific parameter */
273                         scsi_buf[3] = atapi_buf[7];             /* Block descriptor length */
274                         memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
275                 }
276                 if (pc->c[0] == INQUIRY) {
277                         scsi_buf[2] |= 2;                       /* ansi_revision */
278                         scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
279                 }
280         }
281         if (atapi_buf && atapi_buf != scsi_buf)
282                 kfree(atapi_buf);
283 }
284
285 static void hexdump(u8 *x, int len)
286 {
287         int i;
288
289         printk("[ ");
290         for (i = 0; i < len; i++)
291                 printk("%x ", x[i]);
292         printk("]\n");
293 }
294
295 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
296 {
297         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
298         idescsi_pc_t   *pc;
299         struct request *rq;
300         u8             *buf;
301
302         /* stuff a sense request in front of our current request */
303         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
304         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
305         buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
306         if (pc == NULL || rq == NULL || buf == NULL) {
307                 if (pc) kfree(pc);
308                 if (rq) kfree(rq);
309                 if (buf) kfree(buf);
310                 return -ENOMEM;
311         }
312         memset (pc, 0, sizeof (idescsi_pc_t));
313         memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
314         ide_init_drive_cmd(rq);
315         rq->special = (char *) pc;
316         pc->rq = rq;
317         pc->buffer = buf;
318         pc->c[0] = REQUEST_SENSE;
319         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
320         rq->flags = REQ_SENSE;
321         pc->timeout = jiffies + WAIT_READY;
322         /* NOTE! Save the failed packet command in "rq->buffer" */
323         rq->buffer = (void *) failed_command->special;
324         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
325         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
326                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
327                 hexdump(pc->c, 6);
328         }
329         rq->rq_disk = scsi->disk;
330         return ide_do_drive_cmd(drive, rq, ide_preempt);
331 }
332
333 static int idescsi_end_request(ide_drive_t *, int, int);
334
335 static ide_startstop_t
336 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
337 {
338         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
339                 /* force an abort */
340                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
341
342         rq->errors++;
343
344         idescsi_end_request(drive, 0, 0);
345
346         return ide_stopped;
347 }
348
349 static ide_startstop_t
350 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
351 {
352 #if IDESCSI_DEBUG_LOG
353         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
354                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
355 #endif
356         rq->errors |= ERROR_MAX;
357
358         idescsi_end_request(drive, 0, 0);
359
360         return ide_stopped;
361 }
362
363 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
364 {
365         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
366         struct request *rq = HWGROUP(drive)->rq;
367         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
368         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
369         struct Scsi_Host *host;
370         u8 *scsi_buf;
371         unsigned long flags;
372
373         if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
374                 ide_end_request(drive, uptodate, nrsecs);
375                 return 0;
376         }
377         ide_end_drive_cmd (drive, 0, 0);
378         if (rq->flags & REQ_SENSE) {
379                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
380                 if (log) {
381                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
382                         hexdump(pc->buffer,16);
383                 }
384                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
385                 kfree(pc->buffer);
386                 kfree(pc);
387                 kfree(rq);
388                 pc = opc;
389                 rq = pc->rq;
390                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
391                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
392         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
393                 if (log)
394                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
395                                         drive->name, pc->scsi_cmd->serial_number);
396                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
397         } else if (rq->errors >= ERROR_MAX) {
398                 pc->scsi_cmd->result = DID_ERROR << 16;
399                 if (log)
400                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
401         } else if (rq->errors) {
402                 if (log)
403                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
404                 if (!idescsi_check_condition(drive, rq))
405                         /* we started a request sense, so we'll be back, exit for now */
406                         return 0;
407                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
408         } else {
409                 pc->scsi_cmd->result = DID_OK << 16;
410                 idescsi_transform_pc2 (drive, pc);
411                 if (log) {
412                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
413                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
414                                 printk(", rst = ");
415                                 scsi_buf = pc->scsi_cmd->request_buffer;
416                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
417                         } else printk("\n");
418                 }
419         }
420         host = pc->scsi_cmd->device->host;
421         spin_lock_irqsave(host->host_lock, flags);
422         pc->done(pc->scsi_cmd);
423         spin_unlock_irqrestore(host->host_lock, flags);
424         kfree(pc);
425         kfree(rq);
426         scsi->pc = NULL;
427         return 0;
428 }
429
430 static inline unsigned long get_timeout(idescsi_pc_t *pc)
431 {
432         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
433 }
434
435 static int idescsi_expiry(ide_drive_t *drive)
436 {
437         idescsi_scsi_t *scsi = drive->driver_data;
438         idescsi_pc_t   *pc   = scsi->pc;
439
440 #if IDESCSI_DEBUG_LOG
441         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
442 #endif
443         set_bit(PC_TIMEDOUT, &pc->flags);
444
445         return 0;                                       /* we do not want the ide subsystem to retry */
446 }
447
448 /*
449  *      Our interrupt handler.
450  */
451 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
452 {
453         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
454         idescsi_pc_t *pc=scsi->pc;
455         struct request *rq = pc->rq;
456         atapi_bcount_t bcount;
457         atapi_status_t status;
458         atapi_ireason_t ireason;
459         atapi_feature_t feature;
460
461         unsigned int temp;
462
463 #if IDESCSI_DEBUG_LOG
464         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
465 #endif /* IDESCSI_DEBUG_LOG */
466
467         if (test_bit(PC_TIMEDOUT, &pc->flags)){
468 #if IDESCSI_DEBUG_LOG
469                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
470                                 pc->scsi_cmd->serial_number, jiffies);
471 #endif
472                 /* end this request now - scsi should retry it*/
473                 idescsi_end_request (drive, 1, 0);
474                 return ide_stopped;
475         }
476         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
477 #if IDESCSI_DEBUG_LOG
478                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
479 #endif /* IDESCSI_DEBUG_LOG */
480                 pc->actually_transferred=pc->request_transfer;
481                 (void) HWIF(drive)->ide_dma_end(drive);
482         }
483
484         feature.all = 0;
485         /* Clear the interrupt */
486         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
487
488         if (!status.b.drq) {
489                 /* No more interrupts */
490                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
491                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
492                 local_irq_enable();
493                 if (status.b.check)
494                         rq->errors++;
495                 idescsi_end_request (drive, 1, 0);
496                 return ide_stopped;
497         }
498         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
499         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
500         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
501
502         if (ireason.b.cod) {
503                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
504                 return ide_do_reset (drive);
505         }
506         if (ireason.b.io) {
507                 temp = pc->actually_transferred + bcount.all;
508                 if (temp > pc->request_transfer) {
509                         if (temp > pc->buffer_size) {
510                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
511                                         "send us more data than expected "
512                                         "- discarding data\n");
513                                 temp = pc->buffer_size - pc->actually_transferred;
514                                 if (temp) {
515                                         clear_bit(PC_WRITING, &pc->flags);
516                                         if (pc->sg)
517                                                 idescsi_input_buffers(drive, pc, temp);
518                                         else
519                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
520                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
521                                 }
522                                 pc->actually_transferred += temp;
523                                 pc->current_position += temp;
524                                 idescsi_discard_data(drive, bcount.all - temp);
525                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
526                                 return ide_started;
527                         }
528 #if IDESCSI_DEBUG_LOG
529                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
530 #endif /* IDESCSI_DEBUG_LOG */
531                 }
532         }
533         if (ireason.b.io) {
534                 clear_bit(PC_WRITING, &pc->flags);
535                 if (pc->sg)
536                         idescsi_input_buffers(drive, pc, bcount.all);
537                 else
538                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
539         } else {
540                 set_bit(PC_WRITING, &pc->flags);
541                 if (pc->sg)
542                         idescsi_output_buffers (drive, pc, bcount.all);
543                 else
544                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
545         }
546         /* Update the current position */
547         pc->actually_transferred += bcount.all;
548         pc->current_position += bcount.all;
549
550         /* And set the interrupt handler again */
551         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
552         return ide_started;
553 }
554
555 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
556 {
557         ide_hwif_t *hwif = drive->hwif;
558         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
559         idescsi_pc_t *pc = scsi->pc;
560         atapi_ireason_t ireason;
561         ide_startstop_t startstop;
562
563         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
564                 printk(KERN_ERR "ide-scsi: Strange, packet command "
565                         "initiated yet DRQ isn't asserted\n");
566                 return startstop;
567         }
568         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
569         if (!ireason.b.cod || ireason.b.io) {
570                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
571                                 "issuing a packet command\n");
572                 return ide_do_reset (drive);
573         }
574         if (HWGROUP(drive)->handler != NULL)
575                 BUG();
576         /* Set the interrupt routine */
577         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
578         /* Send the actual packet */
579         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
580         if (test_bit (PC_DMA_OK, &pc->flags)) {
581                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
582                 hwif->dma_start(drive);
583         }
584         return ide_started;
585 }
586
587 static inline int idescsi_set_direction(idescsi_pc_t *pc)
588 {
589         switch (pc->c[0]) {
590                 case READ_6: case READ_10: case READ_12:
591                         clear_bit(PC_WRITING, &pc->flags);
592                         return 0;
593                 case WRITE_6: case WRITE_10: case WRITE_12:
594                         set_bit(PC_WRITING, &pc->flags);
595                         return 0;
596                 default:
597                         return 1;
598         }
599 }
600
601 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
602 {
603         ide_hwif_t *hwif = drive->hwif;
604         struct scatterlist *sg, *scsi_sg;
605         int segments;
606
607         if (!pc->request_transfer || pc->request_transfer % 1024)
608                 return 1;
609
610         if (idescsi_set_direction(pc))
611                 return 1;
612
613         sg = hwif->sg_table;
614         scsi_sg = pc->scsi_cmd->request_buffer;
615         segments = pc->scsi_cmd->use_sg;
616
617         if (segments > hwif->sg_max_nents)
618                 return 1;
619
620         if (!segments) {
621                 hwif->sg_nents = 1;
622                 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
623         } else {
624                 hwif->sg_nents = segments;
625                 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
626         }
627
628         return 0;
629 }
630
631 /*
632  *      Issue a packet command
633  */
634 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
635 {
636         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
637         ide_hwif_t *hwif = drive->hwif;
638         atapi_feature_t feature;
639         atapi_bcount_t bcount;
640
641         scsi->pc=pc;                                                    /* Set the current packet command */
642         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
643         pc->current_position=pc->buffer;
644         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
645
646         feature.all = 0;
647         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
648                 hwif->sg_mapped = 1;
649                 feature.b.dma = !hwif->dma_setup(drive);
650                 hwif->sg_mapped = 0;
651         }
652
653         SELECT_DRIVE(drive);
654         if (IDE_CONTROL_REG)
655                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
656
657         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
658         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
659         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
660
661         if (feature.b.dma)
662                 set_bit(PC_DMA_OK, &pc->flags);
663
664         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
665                 if (HWGROUP(drive)->handler != NULL)
666                         BUG();
667                 ide_set_handler(drive, &idescsi_transfer_pc,
668                                 get_timeout(pc), idescsi_expiry);
669                 /* Issue the packet command */
670                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
671                 return ide_started;
672         } else {
673                 /* Issue the packet command */
674                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
675                 return idescsi_transfer_pc(drive);
676         }
677 }
678
679 /*
680  *      idescsi_do_request is our request handling function.
681  */
682 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
683 {
684 #if IDESCSI_DEBUG_LOG
685         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);
686         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
687 #endif /* IDESCSI_DEBUG_LOG */
688
689         if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
690                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
691         }
692         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
693         idescsi_end_request (drive, 0, 0);
694         return ide_stopped;
695 }
696
697 static void idescsi_add_settings(ide_drive_t *drive)
698 {
699         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
700
701 /*
702  *                      drive   setting name    read/write      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
703  */
704         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
705         ide_add_setting(drive,  "bios_head",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
706         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
707         ide_add_setting(drive,  "transform",    SETTING_RW,     -1,     -1,             TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
708         ide_add_setting(drive,  "log",          SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
709 }
710
711 /*
712  *      Driver initialization.
713  */
714 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
715 {
716         DRIVER(drive)->busy++;
717         if (drive->id && (drive->id->config & 0x0060) == 0x20)
718                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
719         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
720         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
721 #if IDESCSI_DEBUG_LOG
722         set_bit(IDESCSI_LOG_CMD, &scsi->log);
723 #endif /* IDESCSI_DEBUG_LOG */
724         idescsi_add_settings(drive);
725         DRIVER(drive)->busy--;
726 }
727
728 static int idescsi_cleanup (ide_drive_t *drive)
729 {
730         struct Scsi_Host *scsihost = drive->driver_data;
731         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
732         struct gendisk *g = scsi->disk;
733
734         if (ide_unregister_subdriver(drive))
735                 return 1;
736
737         ide_unregister_region(g);
738
739         drive->driver_data = NULL;
740         g->private_data = NULL;
741         put_disk(g);
742
743         scsi_remove_host(scsihost);
744         ide_scsi_put(scsi);
745
746         return 0;
747 }
748
749 static int idescsi_attach(ide_drive_t *drive);
750
751 #ifdef CONFIG_PROC_FS
752 static ide_proc_entry_t idescsi_proc[] = {
753         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
754         { NULL, 0, NULL, NULL }
755 };
756 #else
757 # define idescsi_proc   NULL
758 #endif
759
760 /*
761  *      IDE subdriver functions, registered with ide.c
762  */
763 static ide_driver_t idescsi_driver = {
764         .owner                  = THIS_MODULE,
765         .name                   = "ide-scsi",
766         .version                = IDESCSI_VERSION,
767         .media                  = ide_scsi,
768         .busy                   = 0,
769         .supports_dsc_overlap   = 0,
770         .proc                   = idescsi_proc,
771         .attach                 = idescsi_attach,
772         .cleanup                = idescsi_cleanup,
773         .do_request             = idescsi_do_request,
774         .end_request            = idescsi_end_request,
775         .error                  = idescsi_atapi_error,
776         .abort                  = idescsi_atapi_abort,
777         .drives                 = LIST_HEAD_INIT(idescsi_driver.drives),
778 };
779
780 static int idescsi_ide_open(struct inode *inode, struct file *filp)
781 {
782         struct gendisk *disk = inode->i_bdev->bd_disk;
783         struct ide_scsi_obj *scsi;
784         ide_drive_t *drive;
785
786         if (!(scsi = ide_scsi_get(disk)))
787                 return -ENXIO;
788
789         drive = scsi->drive;
790
791         drive->usage++;
792
793         return 0;
794 }
795
796 static int idescsi_ide_release(struct inode *inode, struct file *filp)
797 {
798         struct gendisk *disk = inode->i_bdev->bd_disk;
799         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
800         ide_drive_t *drive = scsi->drive;
801
802         drive->usage--;
803
804         ide_scsi_put(scsi);
805
806         return 0;
807 }
808
809 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
810                         unsigned int cmd, unsigned long arg)
811 {
812         struct block_device *bdev = inode->i_bdev;
813         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
814         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
815 }
816
817 static struct block_device_operations idescsi_ops = {
818         .owner          = THIS_MODULE,
819         .open           = idescsi_ide_open,
820         .release        = idescsi_ide_release,
821         .ioctl          = idescsi_ide_ioctl,
822 };
823
824 static int idescsi_attach(ide_drive_t *drive);
825
826 static int idescsi_slave_configure(struct scsi_device * sdp)
827 {
828         /* Configure detected device */
829         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
830         return 0;
831 }
832
833 static const char *idescsi_info (struct Scsi_Host *host)
834 {
835         return "SCSI host adapter emulation for IDE ATAPI devices";
836 }
837
838 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
839 {
840         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
841
842         if (cmd == SG_SET_TRANSFORM) {
843                 if (arg)
844                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
845                 else
846                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
847                 return 0;
848         } else if (cmd == SG_GET_TRANSFORM)
849                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
850         return -EINVAL;
851 }
852
853 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
854 {
855         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
856
857         /* this was a layering violation and we can't support it
858            anymore, sorry. */
859 #if 0
860         struct gendisk *disk = cmd->request->rq_disk;
861
862         if (disk) {
863                 struct Scsi_Device_Template **p = disk->private_data;
864                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
865                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
866         }
867 #endif
868         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
869 }
870
871 static int idescsi_queue (struct scsi_cmnd *cmd,
872                 void (*done)(struct scsi_cmnd *))
873 {
874         struct Scsi_Host *host = cmd->device->host;
875         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
876         ide_drive_t *drive = scsi->drive;
877         struct request *rq = NULL;
878         idescsi_pc_t *pc = NULL;
879
880         if (!drive) {
881                 printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->device->id);
882                 goto abort;
883         }
884         scsi = drive_to_idescsi(drive);
885         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
886         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
887         if (rq == NULL || pc == NULL) {
888                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
889                 goto abort;
890         }
891
892         memset (pc->c, 0, 12);
893         pc->flags = 0;
894         pc->rq = rq;
895         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
896         if (cmd->use_sg) {
897                 pc->buffer = NULL;
898                 pc->sg = cmd->request_buffer;
899         } else {
900                 pc->buffer = cmd->request_buffer;
901                 pc->sg = NULL;
902         }
903         pc->b_count = 0;
904         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
905         pc->scsi_cmd = cmd;
906         pc->done = done;
907         pc->timeout = jiffies + cmd->timeout_per_command;
908
909         if (should_transform(drive, cmd))
910                 set_bit(PC_TRANSFORM, &pc->flags);
911         idescsi_transform_pc1 (drive, pc);
912
913         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
914                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
915                 hexdump(cmd->cmnd, cmd->cmd_len);
916                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
917                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
918                         hexdump(pc->c, 12);
919                 }
920         }
921
922         ide_init_drive_cmd (rq);
923         rq->special = (char *) pc;
924         rq->flags = REQ_SPECIAL;
925         spin_unlock_irq(host->host_lock);
926         rq->rq_disk = scsi->disk;
927         (void) ide_do_drive_cmd (drive, rq, ide_end);
928         spin_lock_irq(host->host_lock);
929         return 0;
930 abort:
931         if (pc) kfree (pc);
932         if (rq) kfree (rq);
933         cmd->result = DID_ERROR << 16;
934         done(cmd);
935         return 0;
936 }
937
938 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
939 {
940         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
941         ide_drive_t    *drive = scsi->drive;
942         int             busy;
943         int             ret   = FAILED;
944
945         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
946
947         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
948                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
949
950         if (!drive) {
951                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
952                 WARN_ON(1);
953                 goto no_drive;
954         }
955
956         /* First give it some more time, how much is "right" is hard to say :-( */
957
958         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
959         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
960                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
961
962         spin_lock_irq(&ide_lock);
963
964         /* If there is no pc running we're done (our interrupt took care of it) */
965         if (!scsi->pc) {
966                 ret = SUCCESS;
967                 goto ide_unlock;
968         }
969
970         /* It's somewhere in flight. Does ide subsystem agree? */
971         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
972             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
973                 /*
974                  * FIXME - not sure this condition can ever occur
975                  */
976                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
977
978                 if (scsi->pc->rq->flags & REQ_SENSE)
979                         kfree(scsi->pc->buffer);
980                 kfree(scsi->pc->rq);
981                 kfree(scsi->pc);
982                 scsi->pc = NULL;
983
984                 ret = SUCCESS;
985         }
986
987 ide_unlock:
988         spin_unlock_irq(&ide_lock);
989 no_drive:
990         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
991                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
992
993         return ret;
994 }
995
996 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
997 {
998         struct request *req;
999         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
1000         ide_drive_t    *drive = scsi->drive;
1001         int             ready = 0;
1002         int             ret   = SUCCESS;
1003
1004         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1005
1006         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1007                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1008
1009         if (!drive) {
1010                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1011                 WARN_ON(1);
1012                 return FAILED;
1013         }
1014
1015         spin_lock_irq(&ide_lock);
1016
1017         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1018                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1019                 spin_unlock(&ide_lock);
1020                 return FAILED;
1021         }
1022
1023         /* kill current request */
1024         blkdev_dequeue_request(req);
1025         end_that_request_last(req);
1026         if (req->flags & REQ_SENSE)
1027                 kfree(scsi->pc->buffer);
1028         kfree(scsi->pc);
1029         scsi->pc = NULL;
1030         kfree(req);
1031
1032         /* now nuke the drive queue */
1033         while ((req = elv_next_request(drive->queue))) {
1034                 blkdev_dequeue_request(req);
1035                 end_that_request_last(req);
1036         }
1037
1038         HWGROUP(drive)->rq = NULL;
1039         HWGROUP(drive)->handler = NULL;
1040         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
1041         spin_unlock_irq(&ide_lock);
1042
1043         ide_do_reset(drive);
1044
1045         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1046
1047         do {
1048                 set_current_state(TASK_UNINTERRUPTIBLE);
1049                 spin_unlock_irq(cmd->device->host->host_lock);
1050                 schedule_timeout(HZ/20);
1051                 spin_lock_irq(cmd->device->host->host_lock);
1052         } while ( HWGROUP(drive)->handler );
1053
1054         ready = drive_is_ready(drive);
1055         HWGROUP(drive)->busy--;
1056         if (!ready) {
1057                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1058                 ret = FAILED;
1059         }
1060
1061         return ret;
1062 }
1063
1064 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1065                 sector_t capacity, int *parm)
1066 {
1067         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1068         ide_drive_t *drive = idescsi->drive;
1069
1070         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1071                 parm[0] = drive->bios_head;
1072                 parm[1] = drive->bios_sect;
1073                 parm[2] = drive->bios_cyl;
1074         }
1075         return 0;
1076 }
1077
1078 static struct scsi_host_template idescsi_template = {
1079         .module                 = THIS_MODULE,
1080         .name                   = "idescsi",
1081         .info                   = idescsi_info,
1082         .slave_configure        = idescsi_slave_configure,
1083         .ioctl                  = idescsi_ioctl,
1084         .queuecommand           = idescsi_queue,
1085         .eh_abort_handler       = idescsi_eh_abort,
1086         .eh_host_reset_handler  = idescsi_eh_reset,
1087         .bios_param             = idescsi_bios,
1088         .can_queue              = 40,
1089         .this_id                = -1,
1090         .sg_tablesize           = 256,
1091         .cmd_per_lun            = 5,
1092         .max_sectors            = 128,
1093         .use_clustering         = DISABLE_CLUSTERING,
1094         .emulated               = 1,
1095         .proc_name              = "ide-scsi",
1096 };
1097
1098 static int idescsi_attach(ide_drive_t *drive)
1099 {
1100         idescsi_scsi_t *idescsi;
1101         struct Scsi_Host *host;
1102         struct gendisk *g;
1103         static int warned;
1104         int err = -ENOMEM;
1105
1106         if (!warned && drive->media == ide_cdrom) {
1107                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1108                 warned = 1;
1109         }
1110
1111         if (!strstr("ide-scsi", drive->driver_req) ||
1112             !drive->present ||
1113             drive->media == ide_disk ||
1114             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1115                 return 1;
1116
1117         g = alloc_disk(1 << PARTN_BITS);
1118         if (!g)
1119                 goto out_host_put;
1120
1121         ide_init_disk(g, drive);
1122
1123         host->max_id = 1;
1124
1125 #if IDESCSI_DEBUG_LOG
1126         if (drive->id->last_lun)
1127                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1128 #endif
1129         if ((drive->id->last_lun & 0x7) != 7)
1130                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1131         else
1132                 host->max_lun = 1;
1133
1134         drive->driver_data = host;
1135         idescsi = scsihost_to_idescsi(host);
1136         idescsi->drive = drive;
1137         idescsi->driver = &idescsi_driver;
1138         idescsi->host = host;
1139         idescsi->disk = g;
1140         g->private_data = &idescsi->driver;
1141         err = ide_register_subdriver(drive, &idescsi_driver);
1142         if (!err) {
1143                 idescsi_setup (drive, idescsi);
1144                 g->fops = &idescsi_ops;
1145                 ide_register_region(g);
1146                 err = scsi_add_host(host, &drive->gendev);
1147                 if (!err) {
1148                         scsi_scan_host(host);
1149                         return 0;
1150                 }
1151                 /* fall through on error */
1152                 ide_unregister_region(g);
1153                 ide_unregister_subdriver(drive);
1154         }
1155
1156         put_disk(g);
1157 out_host_put:
1158         scsi_host_put(host);
1159         return err;
1160 }
1161
1162 static int __init init_idescsi_module(void)
1163 {
1164         return ide_register_driver(&idescsi_driver);
1165 }
1166
1167 static void __exit exit_idescsi_module(void)
1168 {
1169         ide_unregister_driver(&idescsi_driver);
1170 }
1171
1172 module_init(init_idescsi_module);
1173 module_exit(exit_idescsi_module);
1174 MODULE_LICENSE("GPL");