Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6
[linux-2.6] / drivers / scsi / ide-scsi.c
1 /*
2  * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
3  * Copyright (C) 2004-2005  Bartlomiej Zolnierkiewicz
4  */
5
6 /*
7  * Emulation of a SCSI host adapter for IDE ATAPI devices.
8  *
9  * With this driver, one can use the Linux SCSI drivers instead of the
10  * native IDE ATAPI drivers.
11  *
12  * Ver 0.1   Dec  3 96   Initial version.
13  * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
14  *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
15  *                        to Janos Farkas for pointing this out.
16  *                       Avoid using bitfields in structures for m68k.
17  *                       Added Scatter/Gather and DMA support.
18  * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
19  *                       Use variable timeout for each command.
20  * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
21  *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
22  * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
23  *                        for access through /dev/sg.
24  *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
25  * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
26  *                        detection of devices with CONFIG_SCSI_MULTI_LUN
27  * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
28  * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
29  * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
30  * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
31  */
32
33 #define IDESCSI_VERSION "0.92"
34
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/string.h>
38 #include <linux/kernel.h>
39 #include <linux/mm.h>
40 #include <linux/ioport.h>
41 #include <linux/blkdev.h>
42 #include <linux/errno.h>
43 #include <linux/hdreg.h>
44 #include <linux/slab.h>
45 #include <linux/ide.h>
46 #include <linux/scatterlist.h>
47 #include <linux/delay.h>
48 #include <linux/mutex.h>
49 #include <linux/bitops.h>
50
51 #include <asm/io.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         unsigned int sg_cnt;                    /* Number of entries in sg */
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_TIMEDOUT                     3       /* command timed out */
86 #define PC_DMA_OK                       4       /* Use DMA */
87
88 /*
89  *      SCSI command transformation layer
90  */
91 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
92
93 /*
94  *      Log flags
95  */
96 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
97
98 typedef struct ide_scsi_obj {
99         ide_drive_t             *drive;
100         ide_driver_t            *driver;
101         struct gendisk          *disk;
102         struct Scsi_Host        *host;
103
104         idescsi_pc_t *pc;                       /* Current packet command */
105         unsigned long flags;                    /* Status/Action flags */
106         unsigned long transform;                /* SCSI cmd translation layer */
107         unsigned long log;                      /* log flags */
108 } idescsi_scsi_t;
109
110 static DEFINE_MUTEX(idescsi_ref_mutex);
111 static int idescsi_nocd;                        /* Set by module param to skip cd */
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         mutex_lock(&idescsi_ref_mutex);
121         scsi = ide_scsi_g(disk);
122         if (scsi)
123                 scsi_host_get(scsi->host);
124         mutex_unlock(&idescsi_ref_mutex);
125         return scsi;
126 }
127
128 static void ide_scsi_put(struct ide_scsi_obj *scsi)
129 {
130         mutex_lock(&idescsi_ref_mutex);
131         scsi_host_put(scsi->host);
132         mutex_unlock(&idescsi_ref_mutex);
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                 count = min(pc->sg->length - pc->b_count, bcount);
177                 if (PageHighMem(sg_page(pc->sg))) {
178                         unsigned long flags;
179
180                         local_irq_save(flags);
181                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
182                                         pc->sg->offset;
183                         drive->hwif->atapi_input_bytes(drive,
184                                                 buf + pc->b_count, count);
185                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
186                         local_irq_restore(flags);
187                 } else {
188                         buf = sg_virt(pc->sg);
189                         drive->hwif->atapi_input_bytes(drive,
190                                                 buf + pc->b_count, count);
191                 }
192                 bcount -= count; pc->b_count += count;
193                 if (pc->b_count == pc->sg->length) {
194                         if (!--pc->sg_cnt)
195                                 break;
196                         pc->sg = sg_next(pc->sg);
197                         pc->b_count = 0;
198                 }
199         }
200
201         if (bcount) {
202                 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
203                 idescsi_discard_data (drive, bcount);
204         }
205 }
206
207 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
208 {
209         int count;
210         char *buf;
211
212         while (bcount) {
213                 count = min(pc->sg->length - pc->b_count, bcount);
214                 if (PageHighMem(sg_page(pc->sg))) {
215                         unsigned long flags;
216
217                         local_irq_save(flags);
218                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
219                                                 pc->sg->offset;
220                         drive->hwif->atapi_output_bytes(drive,
221                                                 buf + pc->b_count, count);
222                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
223                         local_irq_restore(flags);
224                 } else {
225                         buf = sg_virt(pc->sg);
226                         drive->hwif->atapi_output_bytes(drive,
227                                                 buf + pc->b_count, count);
228                 }
229                 bcount -= count; pc->b_count += count;
230                 if (pc->b_count == pc->sg->length) {
231                         if (!--pc->sg_cnt)
232                                 break;
233                         pc->sg = sg_next(pc->sg);
234                         pc->b_count = 0;
235                 }
236         }
237
238         if (bcount) {
239                 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
240                 idescsi_output_zeros (drive, bcount);
241         }
242 }
243
244 static void ide_scsi_hex_dump(u8 *data, int len)
245 {
246         print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
247 }
248
249 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
250 {
251         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
252         idescsi_pc_t   *pc;
253         struct request *rq;
254         u8             *buf;
255
256         /* stuff a sense request in front of our current request */
257         pc = kzalloc(sizeof(idescsi_pc_t), GFP_ATOMIC);
258         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
259         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
260         if (!pc || !rq || !buf) {
261                 kfree(buf);
262                 kfree(rq);
263                 kfree(pc);
264                 return -ENOMEM;
265         }
266         ide_init_drive_cmd(rq);
267         rq->special = (char *) pc;
268         pc->rq = rq;
269         pc->buffer = buf;
270         pc->c[0] = REQUEST_SENSE;
271         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
272         rq->cmd_type = REQ_TYPE_SENSE;
273         pc->timeout = jiffies + WAIT_READY;
274         /* NOTE! Save the failed packet command in "rq->buffer" */
275         rq->buffer = (void *) failed_command->special;
276         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
277         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
278                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
279                 ide_scsi_hex_dump(pc->c, 6);
280         }
281         rq->rq_disk = scsi->disk;
282         return ide_do_drive_cmd(drive, rq, ide_preempt);
283 }
284
285 static int idescsi_end_request(ide_drive_t *, int, int);
286
287 static ide_startstop_t
288 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
289 {
290         if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
291                 /* force an abort */
292                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
293
294         rq->errors++;
295
296         idescsi_end_request(drive, 0, 0);
297
298         return ide_stopped;
299 }
300
301 static ide_startstop_t
302 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
303 {
304 #if IDESCSI_DEBUG_LOG
305         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
306                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
307 #endif
308         rq->errors |= ERROR_MAX;
309
310         idescsi_end_request(drive, 0, 0);
311
312         return ide_stopped;
313 }
314
315 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
316 {
317         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
318         struct request *rq = HWGROUP(drive)->rq;
319         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
320         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
321         struct Scsi_Host *host;
322         int errors = rq->errors;
323         unsigned long flags;
324
325         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
326                 ide_end_request(drive, uptodate, nrsecs);
327                 return 0;
328         }
329         ide_end_drive_cmd (drive, 0, 0);
330         if (blk_sense_request(rq)) {
331                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
332                 if (log) {
333                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
334                         ide_scsi_hex_dump(pc->buffer, 16);
335                 }
336                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
337                 kfree(pc->buffer);
338                 kfree(pc);
339                 kfree(rq);
340                 pc = opc;
341                 rq = pc->rq;
342                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
343                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
344         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
345                 if (log)
346                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
347                                         drive->name, pc->scsi_cmd->serial_number);
348                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
349         } else if (errors >= ERROR_MAX) {
350                 pc->scsi_cmd->result = DID_ERROR << 16;
351                 if (log)
352                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
353         } else if (errors) {
354                 if (log)
355                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
356                 if (!idescsi_check_condition(drive, rq))
357                         /* we started a request sense, so we'll be back, exit for now */
358                         return 0;
359                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
360         } else {
361                 pc->scsi_cmd->result = DID_OK << 16;
362         }
363         host = pc->scsi_cmd->device->host;
364         spin_lock_irqsave(host->host_lock, flags);
365         pc->done(pc->scsi_cmd);
366         spin_unlock_irqrestore(host->host_lock, flags);
367         kfree(pc);
368         kfree(rq);
369         scsi->pc = NULL;
370         return 0;
371 }
372
373 static inline unsigned long get_timeout(idescsi_pc_t *pc)
374 {
375         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
376 }
377
378 static int idescsi_expiry(ide_drive_t *drive)
379 {
380         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
381         idescsi_pc_t   *pc   = scsi->pc;
382
383 #if IDESCSI_DEBUG_LOG
384         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
385 #endif
386         set_bit(PC_TIMEDOUT, &pc->flags);
387
388         return 0;                                       /* we do not want the ide subsystem to retry */
389 }
390
391 /*
392  *      Our interrupt handler.
393  */
394 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
395 {
396         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
397         ide_hwif_t *hwif = drive->hwif;
398         idescsi_pc_t *pc = scsi->pc;
399         struct request *rq = pc->rq;
400         unsigned int temp;
401         u16 bcount;
402         u8 stat, ireason;
403
404 #if IDESCSI_DEBUG_LOG
405         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
406 #endif /* IDESCSI_DEBUG_LOG */
407
408         if (test_bit(PC_TIMEDOUT, &pc->flags)){
409 #if IDESCSI_DEBUG_LOG
410                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
411                                 pc->scsi_cmd->serial_number, jiffies);
412 #endif
413                 /* end this request now - scsi should retry it*/
414                 idescsi_end_request (drive, 1, 0);
415                 return ide_stopped;
416         }
417         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
418 #if IDESCSI_DEBUG_LOG
419                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
420 #endif /* IDESCSI_DEBUG_LOG */
421                 pc->actually_transferred=pc->request_transfer;
422                 (void) HWIF(drive)->ide_dma_end(drive);
423         }
424
425         /* Clear the interrupt */
426         stat = ide_read_status(drive);
427
428         if ((stat & DRQ_STAT) == 0) {
429                 /* No more interrupts */
430                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
431                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
432                 local_irq_enable_in_hardirq();
433                 if (stat & ERR_STAT)
434                         rq->errors++;
435                 idescsi_end_request (drive, 1, 0);
436                 return ide_stopped;
437         }
438         bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
439                   hwif->INB(IDE_BCOUNTL_REG);
440         ireason = hwif->INB(IDE_IREASON_REG);
441
442         if (ireason & CD) {
443                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
444                 return ide_do_reset (drive);
445         }
446         if (ireason & IO) {
447                 temp = pc->actually_transferred + bcount;
448                 if (temp > pc->request_transfer) {
449                         if (temp > pc->buffer_size) {
450                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
451                                         "send us more data than expected "
452                                         "- discarding data\n");
453                                 temp = pc->buffer_size - pc->actually_transferred;
454                                 if (temp) {
455                                         clear_bit(PC_WRITING, &pc->flags);
456                                         if (pc->sg)
457                                                 idescsi_input_buffers(drive, pc, temp);
458                                         else
459                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
460                                         printk(KERN_ERR "ide-scsi: transferred"
461                                                         " %d of %d bytes\n",
462                                                         temp, bcount);
463                                 }
464                                 pc->actually_transferred += temp;
465                                 pc->current_position += temp;
466                                 idescsi_discard_data(drive, bcount - temp);
467                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
468                                 return ide_started;
469                         }
470 #if IDESCSI_DEBUG_LOG
471                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
472 #endif /* IDESCSI_DEBUG_LOG */
473                 }
474         }
475         if (ireason & IO) {
476                 clear_bit(PC_WRITING, &pc->flags);
477                 if (pc->sg)
478                         idescsi_input_buffers(drive, pc, bcount);
479                 else
480                         hwif->atapi_input_bytes(drive, pc->current_position,
481                                                 bcount);
482         } else {
483                 set_bit(PC_WRITING, &pc->flags);
484                 if (pc->sg)
485                         idescsi_output_buffers(drive, pc, bcount);
486                 else
487                         hwif->atapi_output_bytes(drive, pc->current_position,
488                                                  bcount);
489         }
490         /* Update the current position */
491         pc->actually_transferred += bcount;
492         pc->current_position += bcount;
493
494         /* And set the interrupt handler again */
495         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
496         return ide_started;
497 }
498
499 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
500 {
501         ide_hwif_t *hwif = drive->hwif;
502         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
503         idescsi_pc_t *pc = scsi->pc;
504         ide_startstop_t startstop;
505         u8 ireason;
506
507         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
508                 printk(KERN_ERR "ide-scsi: Strange, packet command "
509                         "initiated yet DRQ isn't asserted\n");
510                 return startstop;
511         }
512         ireason = hwif->INB(IDE_IREASON_REG);
513         if ((ireason & CD) == 0 || (ireason & IO)) {
514                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
515                                 "issuing a packet command\n");
516                 return ide_do_reset (drive);
517         }
518         BUG_ON(HWGROUP(drive)->handler != NULL);
519         /* Set the interrupt routine */
520         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
521         /* Send the actual packet */
522         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
523         if (test_bit (PC_DMA_OK, &pc->flags)) {
524                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
525                 hwif->dma_start(drive);
526         }
527         return ide_started;
528 }
529
530 static inline int idescsi_set_direction(idescsi_pc_t *pc)
531 {
532         switch (pc->c[0]) {
533                 case READ_6: case READ_10: case READ_12:
534                         clear_bit(PC_WRITING, &pc->flags);
535                         return 0;
536                 case WRITE_6: case WRITE_10: case WRITE_12:
537                         set_bit(PC_WRITING, &pc->flags);
538                         return 0;
539                 default:
540                         return 1;
541         }
542 }
543
544 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
545 {
546         ide_hwif_t *hwif = drive->hwif;
547         struct scatterlist *sg, *scsi_sg;
548         int segments;
549
550         if (!pc->request_transfer || pc->request_transfer % 1024)
551                 return 1;
552
553         if (idescsi_set_direction(pc))
554                 return 1;
555
556         sg = hwif->sg_table;
557         scsi_sg = scsi_sglist(pc->scsi_cmd);
558         segments = scsi_sg_count(pc->scsi_cmd);
559
560         if (segments > hwif->sg_max_nents)
561                 return 1;
562
563         hwif->sg_nents = segments;
564         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
565
566         return 0;
567 }
568
569 /*
570  *      Issue a packet command
571  */
572 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
573 {
574         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
575         ide_hwif_t *hwif = drive->hwif;
576         u16 bcount;
577         u8 dma = 0;
578
579         scsi->pc=pc;                                                    /* Set the current packet command */
580         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
581         pc->current_position=pc->buffer;
582         /* Request to transfer the entire buffer at once */
583         bcount = min(pc->request_transfer, 63 * 1024);
584
585         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
586                 hwif->sg_mapped = 1;
587                 dma = !hwif->dma_setup(drive);
588                 hwif->sg_mapped = 0;
589         }
590
591         ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
592
593         if (dma)
594                 set_bit(PC_DMA_OK, &pc->flags);
595
596         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
597                 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
598                                     get_timeout(pc), idescsi_expiry);
599                 return ide_started;
600         } else {
601                 /* Issue the packet command */
602                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
603                 return idescsi_transfer_pc(drive);
604         }
605 }
606
607 /*
608  *      idescsi_do_request is our request handling function.
609  */
610 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
611 {
612 #if IDESCSI_DEBUG_LOG
613         printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
614         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
615 #endif /* IDESCSI_DEBUG_LOG */
616
617         if (blk_sense_request(rq) || blk_special_request(rq)) {
618                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
619         }
620         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
621         idescsi_end_request (drive, 0, 0);
622         return ide_stopped;
623 }
624
625 #ifdef CONFIG_IDE_PROC_FS
626 static void idescsi_add_settings(ide_drive_t *drive)
627 {
628         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
629
630 /*
631  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
632  */
633         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
634         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
635         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
636         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
637         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
638 }
639 #else
640 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
641 #endif
642
643 /*
644  *      Driver initialization.
645  */
646 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
647 {
648         if (drive->id && (drive->id->config & 0x0060) == 0x20)
649                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
650         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
651 #if IDESCSI_DEBUG_LOG
652         set_bit(IDESCSI_LOG_CMD, &scsi->log);
653 #endif /* IDESCSI_DEBUG_LOG */
654         idescsi_add_settings(drive);
655 }
656
657 static void ide_scsi_remove(ide_drive_t *drive)
658 {
659         struct Scsi_Host *scsihost = drive->driver_data;
660         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
661         struct gendisk *g = scsi->disk;
662
663         scsi_remove_host(scsihost);
664         ide_proc_unregister_driver(drive, scsi->driver);
665
666         ide_unregister_region(g);
667
668         drive->driver_data = NULL;
669         g->private_data = NULL;
670         put_disk(g);
671
672         ide_scsi_put(scsi);
673 }
674
675 static int ide_scsi_probe(ide_drive_t *);
676
677 #ifdef CONFIG_IDE_PROC_FS
678 static ide_proc_entry_t idescsi_proc[] = {
679         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
680         { NULL, 0, NULL, NULL }
681 };
682 #endif
683
684 static ide_driver_t idescsi_driver = {
685         .gen_driver = {
686                 .owner          = THIS_MODULE,
687                 .name           = "ide-scsi",
688                 .bus            = &ide_bus_type,
689         },
690         .probe                  = ide_scsi_probe,
691         .remove                 = ide_scsi_remove,
692         .version                = IDESCSI_VERSION,
693         .media                  = ide_scsi,
694         .supports_dsc_overlap   = 0,
695         .do_request             = idescsi_do_request,
696         .end_request            = idescsi_end_request,
697         .error                  = idescsi_atapi_error,
698         .abort                  = idescsi_atapi_abort,
699 #ifdef CONFIG_IDE_PROC_FS
700         .proc                   = idescsi_proc,
701 #endif
702 };
703
704 static int idescsi_ide_open(struct inode *inode, struct file *filp)
705 {
706         struct gendisk *disk = inode->i_bdev->bd_disk;
707         struct ide_scsi_obj *scsi;
708
709         if (!(scsi = ide_scsi_get(disk)))
710                 return -ENXIO;
711
712         return 0;
713 }
714
715 static int idescsi_ide_release(struct inode *inode, struct file *filp)
716 {
717         struct gendisk *disk = inode->i_bdev->bd_disk;
718         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
719
720         ide_scsi_put(scsi);
721
722         return 0;
723 }
724
725 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
726                         unsigned int cmd, unsigned long arg)
727 {
728         struct block_device *bdev = inode->i_bdev;
729         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
730         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
731 }
732
733 static struct block_device_operations idescsi_ops = {
734         .owner          = THIS_MODULE,
735         .open           = idescsi_ide_open,
736         .release        = idescsi_ide_release,
737         .ioctl          = idescsi_ide_ioctl,
738 };
739
740 static int idescsi_slave_configure(struct scsi_device * sdp)
741 {
742         /* Configure detected device */
743         sdp->use_10_for_rw = 1;
744         sdp->use_10_for_ms = 1;
745         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
746         return 0;
747 }
748
749 static const char *idescsi_info (struct Scsi_Host *host)
750 {
751         return "SCSI host adapter emulation for IDE ATAPI devices";
752 }
753
754 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
755 {
756         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
757
758         if (cmd == SG_SET_TRANSFORM) {
759                 if (arg)
760                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
761                 else
762                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
763                 return 0;
764         } else if (cmd == SG_GET_TRANSFORM)
765                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
766         return -EINVAL;
767 }
768
769 static int idescsi_queue (struct scsi_cmnd *cmd,
770                 void (*done)(struct scsi_cmnd *))
771 {
772         struct Scsi_Host *host = cmd->device->host;
773         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
774         ide_drive_t *drive = scsi->drive;
775         struct request *rq = NULL;
776         idescsi_pc_t *pc = NULL;
777
778         if (!drive) {
779                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
780                 goto abort;
781         }
782         scsi = drive_to_idescsi(drive);
783         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
784         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
785         if (rq == NULL || pc == NULL) {
786                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
787                 goto abort;
788         }
789
790         memset (pc->c, 0, 12);
791         pc->flags = 0;
792         pc->rq = rq;
793         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
794         pc->buffer = NULL;
795         pc->sg = scsi_sglist(cmd);
796         pc->sg_cnt = scsi_sg_count(cmd);
797         pc->b_count = 0;
798         pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
799         pc->scsi_cmd = cmd;
800         pc->done = done;
801         pc->timeout = jiffies + cmd->timeout_per_command;
802
803         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
804                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
805                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
806                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
807                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
808                         ide_scsi_hex_dump(pc->c, 12);
809                 }
810         }
811
812         ide_init_drive_cmd (rq);
813         rq->special = (char *) pc;
814         rq->cmd_type = REQ_TYPE_SPECIAL;
815         spin_unlock_irq(host->host_lock);
816         rq->rq_disk = scsi->disk;
817         (void) ide_do_drive_cmd (drive, rq, ide_end);
818         spin_lock_irq(host->host_lock);
819         return 0;
820 abort:
821         kfree (pc);
822         kfree (rq);
823         cmd->result = DID_ERROR << 16;
824         done(cmd);
825         return 0;
826 }
827
828 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
829 {
830         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
831         ide_drive_t    *drive = scsi->drive;
832         int             busy;
833         int             ret   = FAILED;
834
835         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
836
837         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
838                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
839
840         if (!drive) {
841                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
842                 WARN_ON(1);
843                 goto no_drive;
844         }
845
846         /* First give it some more time, how much is "right" is hard to say :-( */
847
848         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
849         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
850                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
851
852         spin_lock_irq(&ide_lock);
853
854         /* If there is no pc running we're done (our interrupt took care of it) */
855         if (!scsi->pc) {
856                 ret = SUCCESS;
857                 goto ide_unlock;
858         }
859
860         /* It's somewhere in flight. Does ide subsystem agree? */
861         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
862             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
863                 /*
864                  * FIXME - not sure this condition can ever occur
865                  */
866                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
867
868                 if (blk_sense_request(scsi->pc->rq))
869                         kfree(scsi->pc->buffer);
870                 kfree(scsi->pc->rq);
871                 kfree(scsi->pc);
872                 scsi->pc = NULL;
873
874                 ret = SUCCESS;
875         }
876
877 ide_unlock:
878         spin_unlock_irq(&ide_lock);
879 no_drive:
880         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
881                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
882
883         return ret;
884 }
885
886 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
887 {
888         struct request *req;
889         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
890         ide_drive_t    *drive = scsi->drive;
891         int             ready = 0;
892         int             ret   = SUCCESS;
893
894         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
895
896         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
897                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
898
899         if (!drive) {
900                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
901                 WARN_ON(1);
902                 return FAILED;
903         }
904
905         spin_lock_irq(cmd->device->host->host_lock);
906         spin_lock(&ide_lock);
907
908         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
909                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
910                 spin_unlock(&ide_lock);
911                 spin_unlock_irq(cmd->device->host->host_lock);
912                 return FAILED;
913         }
914
915         /* kill current request */
916         if (__blk_end_request(req, -EIO, 0))
917                 BUG();
918         if (blk_sense_request(req))
919                 kfree(scsi->pc->buffer);
920         kfree(scsi->pc);
921         scsi->pc = NULL;
922         kfree(req);
923
924         /* now nuke the drive queue */
925         while ((req = elv_next_request(drive->queue))) {
926                 if (__blk_end_request(req, -EIO, 0))
927                         BUG();
928         }
929
930         HWGROUP(drive)->rq = NULL;
931         HWGROUP(drive)->handler = NULL;
932         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
933         spin_unlock(&ide_lock);
934
935         ide_do_reset(drive);
936
937         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
938
939         do {
940                 spin_unlock_irq(cmd->device->host->host_lock);
941                 msleep(50);
942                 spin_lock_irq(cmd->device->host->host_lock);
943         } while ( HWGROUP(drive)->handler );
944
945         ready = drive_is_ready(drive);
946         HWGROUP(drive)->busy--;
947         if (!ready) {
948                 printk (KERN_ERR "ide-scsi: reset failed!\n");
949                 ret = FAILED;
950         }
951
952         spin_unlock_irq(cmd->device->host->host_lock);
953         return ret;
954 }
955
956 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
957                 sector_t capacity, int *parm)
958 {
959         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
960         ide_drive_t *drive = idescsi->drive;
961
962         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
963                 parm[0] = drive->bios_head;
964                 parm[1] = drive->bios_sect;
965                 parm[2] = drive->bios_cyl;
966         }
967         return 0;
968 }
969
970 static struct scsi_host_template idescsi_template = {
971         .module                 = THIS_MODULE,
972         .name                   = "idescsi",
973         .info                   = idescsi_info,
974         .slave_configure        = idescsi_slave_configure,
975         .ioctl                  = idescsi_ioctl,
976         .queuecommand           = idescsi_queue,
977         .eh_abort_handler       = idescsi_eh_abort,
978         .eh_host_reset_handler  = idescsi_eh_reset,
979         .bios_param             = idescsi_bios,
980         .can_queue              = 40,
981         .this_id                = -1,
982         .sg_tablesize           = 256,
983         .cmd_per_lun            = 5,
984         .max_sectors            = 128,
985         .use_clustering         = DISABLE_CLUSTERING,
986         .emulated               = 1,
987         .proc_name              = "ide-scsi",
988 };
989
990 static int ide_scsi_probe(ide_drive_t *drive)
991 {
992         idescsi_scsi_t *idescsi;
993         struct Scsi_Host *host;
994         struct gendisk *g;
995         static int warned;
996         int err = -ENOMEM;
997
998         if (!warned && drive->media == ide_cdrom) {
999                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1000                 warned = 1;
1001         }
1002
1003         if (idescsi_nocd && drive->media == ide_cdrom)
1004                 return -ENODEV;
1005
1006         if (!strstr("ide-scsi", drive->driver_req) ||
1007             !drive->present ||
1008             drive->media == ide_disk ||
1009             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1010                 return -ENODEV;
1011
1012         g = alloc_disk(1 << PARTN_BITS);
1013         if (!g)
1014                 goto out_host_put;
1015
1016         ide_init_disk(g, drive);
1017
1018         host->max_id = 1;
1019
1020 #if IDESCSI_DEBUG_LOG
1021         if (drive->id->last_lun)
1022                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1023 #endif
1024         if ((drive->id->last_lun & 0x7) != 7)
1025                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1026         else
1027                 host->max_lun = 1;
1028
1029         drive->driver_data = host;
1030         idescsi = scsihost_to_idescsi(host);
1031         idescsi->drive = drive;
1032         idescsi->driver = &idescsi_driver;
1033         idescsi->host = host;
1034         idescsi->disk = g;
1035         g->private_data = &idescsi->driver;
1036         ide_proc_register_driver(drive, &idescsi_driver);
1037         err = 0;
1038         idescsi_setup(drive, idescsi);
1039         g->fops = &idescsi_ops;
1040         ide_register_region(g);
1041         err = scsi_add_host(host, &drive->gendev);
1042         if (!err) {
1043                 scsi_scan_host(host);
1044                 return 0;
1045         }
1046         /* fall through on error */
1047         ide_unregister_region(g);
1048         ide_proc_unregister_driver(drive, &idescsi_driver);
1049
1050         put_disk(g);
1051 out_host_put:
1052         scsi_host_put(host);
1053         return err;
1054 }
1055
1056 static int __init init_idescsi_module(void)
1057 {
1058         return driver_register(&idescsi_driver.gen_driver);
1059 }
1060
1061 static void __exit exit_idescsi_module(void)
1062 {
1063         driver_unregister(&idescsi_driver.gen_driver);
1064 }
1065
1066 module_param(idescsi_nocd, int, 0600);
1067 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1068 module_init(init_idescsi_module);
1069 module_exit(exit_idescsi_module);
1070 MODULE_LICENSE("GPL");