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Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[deliverable/linux.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_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 if (pc->sg - scsi_sglist(pc->scsi_cmd) >
177 scsi_sg_count(pc->scsi_cmd)) {
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 - scsi_sglist(pc->scsi_cmd) >
213 scsi_sg_count(pc->scsi_cmd)) {
214 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
215 idescsi_output_zeros (drive, bcount);
216 return;
217 }
218 count = min(pc->sg->length - pc->b_count, bcount);
219 if (PageHighMem(pc->sg->page)) {
220 unsigned long flags;
221
222 local_irq_save(flags);
223 buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
224 pc->sg->offset;
225 drive->hwif->atapi_output_bytes(drive,
226 buf + pc->b_count, count);
227 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
228 local_irq_restore(flags);
229 } else {
230 buf = page_address(pc->sg->page) + pc->sg->offset;
231 drive->hwif->atapi_output_bytes(drive,
232 buf + pc->b_count, count);
233 }
234 bcount -= count; pc->b_count += count;
235 if (pc->b_count == pc->sg->length) {
236 pc->sg++;
237 pc->b_count = 0;
238 }
239 }
240 }
241
242 static void hexdump(u8 *x, int len)
243 {
244 int i;
245
246 printk("[ ");
247 for (i = 0; i < len; i++)
248 printk("%x ", x[i]);
249 printk("]\n");
250 }
251
252 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
253 {
254 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
255 idescsi_pc_t *pc;
256 struct request *rq;
257 u8 *buf;
258
259 /* stuff a sense request in front of our current request */
260 pc = kzalloc(sizeof(idescsi_pc_t), GFP_ATOMIC);
261 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
262 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
263 if (!pc || !rq || !buf) {
264 kfree(buf);
265 kfree(rq);
266 kfree(pc);
267 return -ENOMEM;
268 }
269 ide_init_drive_cmd(rq);
270 rq->special = (char *) pc;
271 pc->rq = rq;
272 pc->buffer = buf;
273 pc->c[0] = REQUEST_SENSE;
274 pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
275 rq->cmd_type = REQ_TYPE_SENSE;
276 pc->timeout = jiffies + WAIT_READY;
277 /* NOTE! Save the failed packet command in "rq->buffer" */
278 rq->buffer = (void *) failed_command->special;
279 pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
280 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
281 printk ("ide-scsi: %s: queue cmd = ", drive->name);
282 hexdump(pc->c, 6);
283 }
284 rq->rq_disk = scsi->disk;
285 return ide_do_drive_cmd(drive, rq, ide_preempt);
286 }
287
288 static int idescsi_end_request(ide_drive_t *, int, int);
289
290 static ide_startstop_t
291 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
292 {
293 if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
294 /* force an abort */
295 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
296
297 rq->errors++;
298
299 idescsi_end_request(drive, 0, 0);
300
301 return ide_stopped;
302 }
303
304 static ide_startstop_t
305 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
306 {
307 #if IDESCSI_DEBUG_LOG
308 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
309 ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
310 #endif
311 rq->errors |= ERROR_MAX;
312
313 idescsi_end_request(drive, 0, 0);
314
315 return ide_stopped;
316 }
317
318 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
319 {
320 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
321 struct request *rq = HWGROUP(drive)->rq;
322 idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
323 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
324 struct Scsi_Host *host;
325 int errors = rq->errors;
326 unsigned long flags;
327
328 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
329 ide_end_request(drive, uptodate, nrsecs);
330 return 0;
331 }
332 ide_end_drive_cmd (drive, 0, 0);
333 if (blk_sense_request(rq)) {
334 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
335 if (log) {
336 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
337 hexdump(pc->buffer,16);
338 }
339 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
340 kfree(pc->buffer);
341 kfree(pc);
342 kfree(rq);
343 pc = opc;
344 rq = pc->rq;
345 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
346 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
347 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
348 if (log)
349 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
350 drive->name, pc->scsi_cmd->serial_number);
351 pc->scsi_cmd->result = DID_TIME_OUT << 16;
352 } else if (errors >= ERROR_MAX) {
353 pc->scsi_cmd->result = DID_ERROR << 16;
354 if (log)
355 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
356 } else if (errors) {
357 if (log)
358 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
359 if (!idescsi_check_condition(drive, rq))
360 /* we started a request sense, so we'll be back, exit for now */
361 return 0;
362 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
363 } else {
364 pc->scsi_cmd->result = DID_OK << 16;
365 }
366 host = pc->scsi_cmd->device->host;
367 spin_lock_irqsave(host->host_lock, flags);
368 pc->done(pc->scsi_cmd);
369 spin_unlock_irqrestore(host->host_lock, flags);
370 kfree(pc);
371 kfree(rq);
372 scsi->pc = NULL;
373 return 0;
374 }
375
376 static inline unsigned long get_timeout(idescsi_pc_t *pc)
377 {
378 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
379 }
380
381 static int idescsi_expiry(ide_drive_t *drive)
382 {
383 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
384 idescsi_pc_t *pc = scsi->pc;
385
386 #if IDESCSI_DEBUG_LOG
387 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
388 #endif
389 set_bit(PC_TIMEDOUT, &pc->flags);
390
391 return 0; /* we do not want the ide subsystem to retry */
392 }
393
394 /*
395 * Our interrupt handler.
396 */
397 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
398 {
399 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
400 idescsi_pc_t *pc=scsi->pc;
401 struct request *rq = pc->rq;
402 atapi_bcount_t bcount;
403 atapi_status_t status;
404 atapi_ireason_t ireason;
405 atapi_feature_t feature;
406
407 unsigned int temp;
408
409 #if IDESCSI_DEBUG_LOG
410 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
411 #endif /* IDESCSI_DEBUG_LOG */
412
413 if (test_bit(PC_TIMEDOUT, &pc->flags)){
414 #if IDESCSI_DEBUG_LOG
415 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
416 pc->scsi_cmd->serial_number, jiffies);
417 #endif
418 /* end this request now - scsi should retry it*/
419 idescsi_end_request (drive, 1, 0);
420 return ide_stopped;
421 }
422 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
423 #if IDESCSI_DEBUG_LOG
424 printk ("ide-scsi: %s: DMA complete\n", drive->name);
425 #endif /* IDESCSI_DEBUG_LOG */
426 pc->actually_transferred=pc->request_transfer;
427 (void) HWIF(drive)->ide_dma_end(drive);
428 }
429
430 feature.all = 0;
431 /* Clear the interrupt */
432 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
433
434 if (!status.b.drq) {
435 /* No more interrupts */
436 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
437 printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
438 local_irq_enable_in_hardirq();
439 if (status.b.check)
440 rq->errors++;
441 idescsi_end_request (drive, 1, 0);
442 return ide_stopped;
443 }
444 bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG);
445 bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG);
446 ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
447
448 if (ireason.b.cod) {
449 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
450 return ide_do_reset (drive);
451 }
452 if (ireason.b.io) {
453 temp = pc->actually_transferred + bcount.all;
454 if (temp > pc->request_transfer) {
455 if (temp > pc->buffer_size) {
456 printk(KERN_ERR "ide-scsi: The scsi wants to "
457 "send us more data than expected "
458 "- discarding data\n");
459 temp = pc->buffer_size - pc->actually_transferred;
460 if (temp) {
461 clear_bit(PC_WRITING, &pc->flags);
462 if (pc->sg)
463 idescsi_input_buffers(drive, pc, temp);
464 else
465 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
466 printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
467 }
468 pc->actually_transferred += temp;
469 pc->current_position += temp;
470 idescsi_discard_data(drive, bcount.all - temp);
471 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
472 return ide_started;
473 }
474 #if IDESCSI_DEBUG_LOG
475 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
476 #endif /* IDESCSI_DEBUG_LOG */
477 }
478 }
479 if (ireason.b.io) {
480 clear_bit(PC_WRITING, &pc->flags);
481 if (pc->sg)
482 idescsi_input_buffers(drive, pc, bcount.all);
483 else
484 HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
485 } else {
486 set_bit(PC_WRITING, &pc->flags);
487 if (pc->sg)
488 idescsi_output_buffers (drive, pc, bcount.all);
489 else
490 HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
491 }
492 /* Update the current position */
493 pc->actually_transferred += bcount.all;
494 pc->current_position += bcount.all;
495
496 /* And set the interrupt handler again */
497 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
498 return ide_started;
499 }
500
501 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
502 {
503 ide_hwif_t *hwif = drive->hwif;
504 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
505 idescsi_pc_t *pc = scsi->pc;
506 atapi_ireason_t ireason;
507 ide_startstop_t startstop;
508
509 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
510 printk(KERN_ERR "ide-scsi: Strange, packet command "
511 "initiated yet DRQ isn't asserted\n");
512 return startstop;
513 }
514 ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
515 if (!ireason.b.cod || ireason.b.io) {
516 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
517 "issuing a packet command\n");
518 return ide_do_reset (drive);
519 }
520 BUG_ON(HWGROUP(drive)->handler != NULL);
521 /* Set the interrupt routine */
522 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
523 /* Send the actual packet */
524 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
525 if (test_bit (PC_DMA_OK, &pc->flags)) {
526 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
527 hwif->dma_start(drive);
528 }
529 return ide_started;
530 }
531
532 static inline int idescsi_set_direction(idescsi_pc_t *pc)
533 {
534 switch (pc->c[0]) {
535 case READ_6: case READ_10: case READ_12:
536 clear_bit(PC_WRITING, &pc->flags);
537 return 0;
538 case WRITE_6: case WRITE_10: case WRITE_12:
539 set_bit(PC_WRITING, &pc->flags);
540 return 0;
541 default:
542 return 1;
543 }
544 }
545
546 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
547 {
548 ide_hwif_t *hwif = drive->hwif;
549 struct scatterlist *sg, *scsi_sg;
550 int segments;
551
552 if (!pc->request_transfer || pc->request_transfer % 1024)
553 return 1;
554
555 if (idescsi_set_direction(pc))
556 return 1;
557
558 sg = hwif->sg_table;
559 scsi_sg = scsi_sglist(pc->scsi_cmd);
560 segments = scsi_sg_count(pc->scsi_cmd);
561
562 if (segments > hwif->sg_max_nents)
563 return 1;
564
565 hwif->sg_nents = segments;
566 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
567
568 return 0;
569 }
570
571 /*
572 * Issue a packet command
573 */
574 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
575 {
576 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
577 ide_hwif_t *hwif = drive->hwif;
578 atapi_feature_t feature;
579 atapi_bcount_t bcount;
580
581 scsi->pc=pc; /* Set the current packet command */
582 pc->actually_transferred=0; /* We haven't transferred any data yet */
583 pc->current_position=pc->buffer;
584 bcount.all = min(pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */
585
586 feature.all = 0;
587 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
588 hwif->sg_mapped = 1;
589 feature.b.dma = !hwif->dma_setup(drive);
590 hwif->sg_mapped = 0;
591 }
592
593 SELECT_DRIVE(drive);
594 if (IDE_CONTROL_REG)
595 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
596
597 HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
598 HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
599 HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
600
601 if (feature.b.dma)
602 set_bit(PC_DMA_OK, &pc->flags);
603
604 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
605 BUG_ON(HWGROUP(drive)->handler != NULL);
606 ide_set_handler(drive, &idescsi_transfer_pc,
607 get_timeout(pc), idescsi_expiry);
608 /* Issue the packet command */
609 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
610 return ide_started;
611 } else {
612 /* Issue the packet command */
613 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
614 return idescsi_transfer_pc(drive);
615 }
616 }
617
618 /*
619 * idescsi_do_request is our request handling function.
620 */
621 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
622 {
623 #if IDESCSI_DEBUG_LOG
624 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
625 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
626 #endif /* IDESCSI_DEBUG_LOG */
627
628 if (blk_sense_request(rq) || blk_special_request(rq)) {
629 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
630 }
631 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
632 idescsi_end_request (drive, 0, 0);
633 return ide_stopped;
634 }
635
636 #ifdef CONFIG_IDE_PROC_FS
637 static void idescsi_add_settings(ide_drive_t *drive)
638 {
639 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
640
641 /*
642 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
643 */
644 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
645 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
646 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
647 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
648 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
649 }
650 #else
651 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
652 #endif
653
654 /*
655 * Driver initialization.
656 */
657 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
658 {
659 if (drive->id && (drive->id->config & 0x0060) == 0x20)
660 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
661 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
662 #if IDESCSI_DEBUG_LOG
663 set_bit(IDESCSI_LOG_CMD, &scsi->log);
664 #endif /* IDESCSI_DEBUG_LOG */
665 idescsi_add_settings(drive);
666 }
667
668 static void ide_scsi_remove(ide_drive_t *drive)
669 {
670 struct Scsi_Host *scsihost = drive->driver_data;
671 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
672 struct gendisk *g = scsi->disk;
673
674 scsi_remove_host(scsihost);
675 ide_proc_unregister_driver(drive, scsi->driver);
676
677 ide_unregister_region(g);
678
679 drive->driver_data = NULL;
680 g->private_data = NULL;
681 put_disk(g);
682
683 ide_scsi_put(scsi);
684 }
685
686 static int ide_scsi_probe(ide_drive_t *);
687
688 #ifdef CONFIG_IDE_PROC_FS
689 static ide_proc_entry_t idescsi_proc[] = {
690 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
691 { NULL, 0, NULL, NULL }
692 };
693 #endif
694
695 static ide_driver_t idescsi_driver = {
696 .gen_driver = {
697 .owner = THIS_MODULE,
698 .name = "ide-scsi",
699 .bus = &ide_bus_type,
700 },
701 .probe = ide_scsi_probe,
702 .remove = ide_scsi_remove,
703 .version = IDESCSI_VERSION,
704 .media = ide_scsi,
705 .supports_dsc_overlap = 0,
706 .do_request = idescsi_do_request,
707 .end_request = idescsi_end_request,
708 .error = idescsi_atapi_error,
709 .abort = idescsi_atapi_abort,
710 #ifdef CONFIG_IDE_PROC_FS
711 .proc = idescsi_proc,
712 #endif
713 };
714
715 static int idescsi_ide_open(struct inode *inode, struct file *filp)
716 {
717 struct gendisk *disk = inode->i_bdev->bd_disk;
718 struct ide_scsi_obj *scsi;
719
720 if (!(scsi = ide_scsi_get(disk)))
721 return -ENXIO;
722
723 return 0;
724 }
725
726 static int idescsi_ide_release(struct inode *inode, struct file *filp)
727 {
728 struct gendisk *disk = inode->i_bdev->bd_disk;
729 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
730
731 ide_scsi_put(scsi);
732
733 return 0;
734 }
735
736 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
737 unsigned int cmd, unsigned long arg)
738 {
739 struct block_device *bdev = inode->i_bdev;
740 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
741 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
742 }
743
744 static struct block_device_operations idescsi_ops = {
745 .owner = THIS_MODULE,
746 .open = idescsi_ide_open,
747 .release = idescsi_ide_release,
748 .ioctl = idescsi_ide_ioctl,
749 };
750
751 static int idescsi_slave_configure(struct scsi_device * sdp)
752 {
753 /* Configure detected device */
754 sdp->use_10_for_rw = 1;
755 sdp->use_10_for_ms = 1;
756 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
757 return 0;
758 }
759
760 static const char *idescsi_info (struct Scsi_Host *host)
761 {
762 return "SCSI host adapter emulation for IDE ATAPI devices";
763 }
764
765 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
766 {
767 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
768
769 if (cmd == SG_SET_TRANSFORM) {
770 if (arg)
771 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
772 else
773 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
774 return 0;
775 } else if (cmd == SG_GET_TRANSFORM)
776 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
777 return -EINVAL;
778 }
779
780 static int idescsi_queue (struct scsi_cmnd *cmd,
781 void (*done)(struct scsi_cmnd *))
782 {
783 struct Scsi_Host *host = cmd->device->host;
784 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
785 ide_drive_t *drive = scsi->drive;
786 struct request *rq = NULL;
787 idescsi_pc_t *pc = NULL;
788
789 if (!drive) {
790 scmd_printk (KERN_ERR, cmd, "drive not present\n");
791 goto abort;
792 }
793 scsi = drive_to_idescsi(drive);
794 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
795 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
796 if (rq == NULL || pc == NULL) {
797 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
798 goto abort;
799 }
800
801 memset (pc->c, 0, 12);
802 pc->flags = 0;
803 pc->rq = rq;
804 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
805 pc->buffer = NULL;
806 pc->sg = scsi_sglist(cmd);
807 pc->b_count = 0;
808 pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
809 pc->scsi_cmd = cmd;
810 pc->done = done;
811 pc->timeout = jiffies + cmd->timeout_per_command;
812
813 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
814 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
815 hexdump(cmd->cmnd, cmd->cmd_len);
816 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
817 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
818 hexdump(pc->c, 12);
819 }
820 }
821
822 ide_init_drive_cmd (rq);
823 rq->special = (char *) pc;
824 rq->cmd_type = REQ_TYPE_SPECIAL;
825 spin_unlock_irq(host->host_lock);
826 rq->rq_disk = scsi->disk;
827 (void) ide_do_drive_cmd (drive, rq, ide_end);
828 spin_lock_irq(host->host_lock);
829 return 0;
830 abort:
831 kfree (pc);
832 kfree (rq);
833 cmd->result = DID_ERROR << 16;
834 done(cmd);
835 return 0;
836 }
837
838 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
839 {
840 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
841 ide_drive_t *drive = scsi->drive;
842 int busy;
843 int ret = FAILED;
844
845 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
846
847 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
848 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
849
850 if (!drive) {
851 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
852 WARN_ON(1);
853 goto no_drive;
854 }
855
856 /* First give it some more time, how much is "right" is hard to say :-( */
857
858 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
859 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
860 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
861
862 spin_lock_irq(&ide_lock);
863
864 /* If there is no pc running we're done (our interrupt took care of it) */
865 if (!scsi->pc) {
866 ret = SUCCESS;
867 goto ide_unlock;
868 }
869
870 /* It's somewhere in flight. Does ide subsystem agree? */
871 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
872 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
873 /*
874 * FIXME - not sure this condition can ever occur
875 */
876 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
877
878 if (blk_sense_request(scsi->pc->rq))
879 kfree(scsi->pc->buffer);
880 kfree(scsi->pc->rq);
881 kfree(scsi->pc);
882 scsi->pc = NULL;
883
884 ret = SUCCESS;
885 }
886
887 ide_unlock:
888 spin_unlock_irq(&ide_lock);
889 no_drive:
890 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
891 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
892
893 return ret;
894 }
895
896 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
897 {
898 struct request *req;
899 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
900 ide_drive_t *drive = scsi->drive;
901 int ready = 0;
902 int ret = SUCCESS;
903
904 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
905
906 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
907 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
908
909 if (!drive) {
910 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
911 WARN_ON(1);
912 return FAILED;
913 }
914
915 spin_lock_irq(cmd->device->host->host_lock);
916 spin_lock(&ide_lock);
917
918 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
919 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
920 spin_unlock(&ide_lock);
921 spin_unlock_irq(cmd->device->host->host_lock);
922 return FAILED;
923 }
924
925 /* kill current request */
926 blkdev_dequeue_request(req);
927 end_that_request_last(req, 0);
928 if (blk_sense_request(req))
929 kfree(scsi->pc->buffer);
930 kfree(scsi->pc);
931 scsi->pc = NULL;
932 kfree(req);
933
934 /* now nuke the drive queue */
935 while ((req = elv_next_request(drive->queue))) {
936 blkdev_dequeue_request(req);
937 end_that_request_last(req, 0);
938 }
939
940 HWGROUP(drive)->rq = NULL;
941 HWGROUP(drive)->handler = NULL;
942 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
943 spin_unlock(&ide_lock);
944
945 ide_do_reset(drive);
946
947 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
948
949 do {
950 spin_unlock_irq(cmd->device->host->host_lock);
951 msleep(50);
952 spin_lock_irq(cmd->device->host->host_lock);
953 } while ( HWGROUP(drive)->handler );
954
955 ready = drive_is_ready(drive);
956 HWGROUP(drive)->busy--;
957 if (!ready) {
958 printk (KERN_ERR "ide-scsi: reset failed!\n");
959 ret = FAILED;
960 }
961
962 spin_unlock_irq(cmd->device->host->host_lock);
963 return ret;
964 }
965
966 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
967 sector_t capacity, int *parm)
968 {
969 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
970 ide_drive_t *drive = idescsi->drive;
971
972 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
973 parm[0] = drive->bios_head;
974 parm[1] = drive->bios_sect;
975 parm[2] = drive->bios_cyl;
976 }
977 return 0;
978 }
979
980 static struct scsi_host_template idescsi_template = {
981 .module = THIS_MODULE,
982 .name = "idescsi",
983 .info = idescsi_info,
984 .slave_configure = idescsi_slave_configure,
985 .ioctl = idescsi_ioctl,
986 .queuecommand = idescsi_queue,
987 .eh_abort_handler = idescsi_eh_abort,
988 .eh_host_reset_handler = idescsi_eh_reset,
989 .bios_param = idescsi_bios,
990 .can_queue = 40,
991 .this_id = -1,
992 .sg_tablesize = 256,
993 .cmd_per_lun = 5,
994 .max_sectors = 128,
995 .use_clustering = DISABLE_CLUSTERING,
996 .emulated = 1,
997 .proc_name = "ide-scsi",
998 };
999
1000 static int ide_scsi_probe(ide_drive_t *drive)
1001 {
1002 idescsi_scsi_t *idescsi;
1003 struct Scsi_Host *host;
1004 struct gendisk *g;
1005 static int warned;
1006 int err = -ENOMEM;
1007
1008 if (!warned && drive->media == ide_cdrom) {
1009 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1010 warned = 1;
1011 }
1012
1013 if (idescsi_nocd && drive->media == ide_cdrom)
1014 return -ENODEV;
1015
1016 if (!strstr("ide-scsi", drive->driver_req) ||
1017 !drive->present ||
1018 drive->media == ide_disk ||
1019 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1020 return -ENODEV;
1021
1022 g = alloc_disk(1 << PARTN_BITS);
1023 if (!g)
1024 goto out_host_put;
1025
1026 ide_init_disk(g, drive);
1027
1028 host->max_id = 1;
1029
1030 #if IDESCSI_DEBUG_LOG
1031 if (drive->id->last_lun)
1032 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1033 #endif
1034 if ((drive->id->last_lun & 0x7) != 7)
1035 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1036 else
1037 host->max_lun = 1;
1038
1039 drive->driver_data = host;
1040 idescsi = scsihost_to_idescsi(host);
1041 idescsi->drive = drive;
1042 idescsi->driver = &idescsi_driver;
1043 idescsi->host = host;
1044 idescsi->disk = g;
1045 g->private_data = &idescsi->driver;
1046 ide_proc_register_driver(drive, &idescsi_driver);
1047 err = 0;
1048 idescsi_setup(drive, idescsi);
1049 g->fops = &idescsi_ops;
1050 ide_register_region(g);
1051 err = scsi_add_host(host, &drive->gendev);
1052 if (!err) {
1053 scsi_scan_host(host);
1054 return 0;
1055 }
1056 /* fall through on error */
1057 ide_unregister_region(g);
1058 ide_proc_unregister_driver(drive, &idescsi_driver);
1059
1060 put_disk(g);
1061 out_host_put:
1062 scsi_host_put(host);
1063 return err;
1064 }
1065
1066 static int __init init_idescsi_module(void)
1067 {
1068 return driver_register(&idescsi_driver.gen_driver);
1069 }
1070
1071 static void __exit exit_idescsi_module(void)
1072 {
1073 driver_unregister(&idescsi_driver.gen_driver);
1074 }
1075
1076 module_param(idescsi_nocd, int, 0600);
1077 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1078 module_init(init_idescsi_module);
1079 module_exit(exit_idescsi_module);
1080 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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