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V4L/DVB (6715): ivtv: Remove unnecessary register update
[linux-2.6/verdex.git] / drivers / scsi / ide-scsi.c
blob9706de9d98d51969044a68f8cf0663fac4dde80e
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 #include <linux/bitops.h>
51
52 #include <asm/io.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 unsigned int sg_cnt; /* Number of entries in sg */
74 int b_count; /* Bytes transferred from current entry */
75 struct scsi_cmnd *scsi_cmd; /* SCSI command */
76 void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
77 unsigned long flags; /* Status/Action flags */
78 unsigned long timeout; /* Command timeout */
79 } idescsi_pc_t;
80
81 /*
82 * Packet command status bits.
83 */
84 #define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
85 #define PC_WRITING 1 /* Data direction */
86 #define PC_TIMEDOUT 3 /* command timed out */
87 #define PC_DMA_OK 4 /* Use DMA */
88
89 /*
90 * SCSI command transformation layer
91 */
92 #define IDESCSI_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 DEFINE_MUTEX(idescsi_ref_mutex);
112 static int idescsi_nocd; /* Set by module param to skip cd */
113
114 #define ide_scsi_g(disk) \
115 container_of((disk)->private_data, struct ide_scsi_obj, driver)
116
117 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
118 {
119 struct ide_scsi_obj *scsi = NULL;
120
121 mutex_lock(&idescsi_ref_mutex);
122 scsi = ide_scsi_g(disk);
123 if (scsi)
124 scsi_host_get(scsi->host);
125 mutex_unlock(&idescsi_ref_mutex);
126 return scsi;
127 }
128
129 static void ide_scsi_put(struct ide_scsi_obj *scsi)
130 {
131 mutex_lock(&idescsi_ref_mutex);
132 scsi_host_put(scsi->host);
133 mutex_unlock(&idescsi_ref_mutex);
134 }
135
136 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
137 {
138 return (idescsi_scsi_t*) (&host[1]);
139 }
140
141 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
142 {
143 return scsihost_to_idescsi(ide_drive->driver_data);
144 }
145
146 /*
147 * Per ATAPI device status bits.
148 */
149 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
150
151 /*
152 * ide-scsi requests.
153 */
154 #define IDESCSI_PC_RQ 90
155
156 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
157 {
158 while (bcount--)
159 (void) HWIF(drive)->INB(IDE_DATA_REG);
160 }
161
162 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
163 {
164 while (bcount--)
165 HWIF(drive)->OUTB(0, IDE_DATA_REG);
166 }
167
168 /*
169 * PIO data transfer routines using the scatter gather table.
170 */
171 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
172 {
173 int count;
174 char *buf;
175
176 while (bcount) {
177 count = min(pc->sg->length - pc->b_count, bcount);
178 if (PageHighMem(sg_page(pc->sg))) {
179 unsigned long flags;
180
181 local_irq_save(flags);
182 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
183 pc->sg->offset;
184 drive->hwif->atapi_input_bytes(drive,
185 buf + pc->b_count, count);
186 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
187 local_irq_restore(flags);
188 } else {
189 buf = sg_virt(pc->sg);
190 drive->hwif->atapi_input_bytes(drive,
191 buf + pc->b_count, count);
192 }
193 bcount -= count; pc->b_count += count;
194 if (pc->b_count == pc->sg->length) {
195 if (!--pc->sg_cnt)
196 break;
197 pc->sg = sg_next(pc->sg);
198 pc->b_count = 0;
199 }
200 }
201
202 if (bcount) {
203 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
204 idescsi_discard_data (drive, bcount);
205 }
206 }
207
208 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
209 {
210 int count;
211 char *buf;
212
213 while (bcount) {
214 count = min(pc->sg->length - pc->b_count, bcount);
215 if (PageHighMem(sg_page(pc->sg))) {
216 unsigned long flags;
217
218 local_irq_save(flags);
219 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
220 pc->sg->offset;
221 drive->hwif->atapi_output_bytes(drive,
222 buf + pc->b_count, count);
223 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
224 local_irq_restore(flags);
225 } else {
226 buf = sg_virt(pc->sg);
227 drive->hwif->atapi_output_bytes(drive,
228 buf + pc->b_count, count);
229 }
230 bcount -= count; pc->b_count += count;
231 if (pc->b_count == pc->sg->length) {
232 if (!--pc->sg_cnt)
233 break;
234 pc->sg = sg_next(pc->sg);
235 pc->b_count = 0;
236 }
237 }
238
239 if (bcount) {
240 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
241 idescsi_output_zeros (drive, bcount);
242 }
243 }
244
245 static void ide_scsi_hex_dump(u8 *data, int len)
246 {
247 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
248 }
249
250 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
251 {
252 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
253 idescsi_pc_t *pc;
254 struct request *rq;
255 u8 *buf;
256
257 /* stuff a sense request in front of our current request */
258 pc = kzalloc(sizeof(idescsi_pc_t), GFP_ATOMIC);
259 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
260 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
261 if (!pc || !rq || !buf) {
262 kfree(buf);
263 kfree(rq);
264 kfree(pc);
265 return -ENOMEM;
266 }
267 ide_init_drive_cmd(rq);
268 rq->special = (char *) pc;
269 pc->rq = rq;
270 pc->buffer = buf;
271 pc->c[0] = REQUEST_SENSE;
272 pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
273 rq->cmd_type = REQ_TYPE_SENSE;
274 pc->timeout = jiffies + WAIT_READY;
275 /* NOTE! Save the failed packet command in "rq->buffer" */
276 rq->buffer = (void *) failed_command->special;
277 pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
278 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
279 printk ("ide-scsi: %s: queue cmd = ", drive->name);
280 ide_scsi_hex_dump(pc->c, 6);
281 }
282 rq->rq_disk = scsi->disk;
283 return ide_do_drive_cmd(drive, rq, ide_preempt);
284 }
285
286 static int idescsi_end_request(ide_drive_t *, int, int);
287
288 static ide_startstop_t
289 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
290 {
291 if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
292 /* force an abort */
293 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
294
295 rq->errors++;
296
297 idescsi_end_request(drive, 0, 0);
298
299 return ide_stopped;
300 }
301
302 static ide_startstop_t
303 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
304 {
305 #if IDESCSI_DEBUG_LOG
306 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
307 ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
308 #endif
309 rq->errors |= ERROR_MAX;
310
311 idescsi_end_request(drive, 0, 0);
312
313 return ide_stopped;
314 }
315
316 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
317 {
318 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
319 struct request *rq = HWGROUP(drive)->rq;
320 idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
321 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
322 struct Scsi_Host *host;
323 int errors = rq->errors;
324 unsigned long flags;
325
326 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
327 ide_end_request(drive, uptodate, nrsecs);
328 return 0;
329 }
330 ide_end_drive_cmd (drive, 0, 0);
331 if (blk_sense_request(rq)) {
332 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
333 if (log) {
334 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
335 ide_scsi_hex_dump(pc->buffer, 16);
336 }
337 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
338 kfree(pc->buffer);
339 kfree(pc);
340 kfree(rq);
341 pc = opc;
342 rq = pc->rq;
343 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
344 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
345 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
346 if (log)
347 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
348 drive->name, pc->scsi_cmd->serial_number);
349 pc->scsi_cmd->result = DID_TIME_OUT << 16;
350 } else if (errors >= ERROR_MAX) {
351 pc->scsi_cmd->result = DID_ERROR << 16;
352 if (log)
353 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
354 } else if (errors) {
355 if (log)
356 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
357 if (!idescsi_check_condition(drive, rq))
358 /* we started a request sense, so we'll be back, exit for now */
359 return 0;
360 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
361 } else {
362 pc->scsi_cmd->result = DID_OK << 16;
363 }
364 host = pc->scsi_cmd->device->host;
365 spin_lock_irqsave(host->host_lock, flags);
366 pc->done(pc->scsi_cmd);
367 spin_unlock_irqrestore(host->host_lock, flags);
368 kfree(pc);
369 kfree(rq);
370 scsi->pc = NULL;
371 return 0;
372 }
373
374 static inline unsigned long get_timeout(idescsi_pc_t *pc)
375 {
376 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
377 }
378
379 static int idescsi_expiry(ide_drive_t *drive)
380 {
381 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
382 idescsi_pc_t *pc = scsi->pc;
383
384 #if IDESCSI_DEBUG_LOG
385 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
386 #endif
387 set_bit(PC_TIMEDOUT, &pc->flags);
388
389 return 0; /* we do not want the ide subsystem to retry */
390 }
391
392 /*
393 * Our interrupt handler.
394 */
395 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
396 {
397 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
398 idescsi_pc_t *pc=scsi->pc;
399 struct request *rq = pc->rq;
400 atapi_bcount_t bcount;
401 atapi_status_t status;
402 atapi_ireason_t ireason;
403 atapi_feature_t feature;
404
405 unsigned int temp;
406
407 #if IDESCSI_DEBUG_LOG
408 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
409 #endif /* IDESCSI_DEBUG_LOG */
410
411 if (test_bit(PC_TIMEDOUT, &pc->flags)){
412 #if IDESCSI_DEBUG_LOG
413 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
414 pc->scsi_cmd->serial_number, jiffies);
415 #endif
416 /* end this request now - scsi should retry it*/
417 idescsi_end_request (drive, 1, 0);
418 return ide_stopped;
419 }
420 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
421 #if IDESCSI_DEBUG_LOG
422 printk ("ide-scsi: %s: DMA complete\n", drive->name);
423 #endif /* IDESCSI_DEBUG_LOG */
424 pc->actually_transferred=pc->request_transfer;
425 (void) HWIF(drive)->ide_dma_end(drive);
426 }
427
428 feature.all = 0;
429 /* Clear the interrupt */
430 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
431
432 if (!status.b.drq) {
433 /* No more interrupts */
434 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
435 printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
436 local_irq_enable_in_hardirq();
437 if (status.b.check)
438 rq->errors++;
439 idescsi_end_request (drive, 1, 0);
440 return ide_stopped;
441 }
442 bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG);
443 bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG);
444 ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
445
446 if (ireason.b.cod) {
447 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
448 return ide_do_reset (drive);
449 }
450 if (ireason.b.io) {
451 temp = pc->actually_transferred + bcount.all;
452 if (temp > pc->request_transfer) {
453 if (temp > pc->buffer_size) {
454 printk(KERN_ERR "ide-scsi: The scsi wants to "
455 "send us more data than expected "
456 "- discarding data\n");
457 temp = pc->buffer_size - pc->actually_transferred;
458 if (temp) {
459 clear_bit(PC_WRITING, &pc->flags);
460 if (pc->sg)
461 idescsi_input_buffers(drive, pc, temp);
462 else
463 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
464 printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
465 }
466 pc->actually_transferred += temp;
467 pc->current_position += temp;
468 idescsi_discard_data(drive, bcount.all - temp);
469 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
470 return ide_started;
471 }
472 #if IDESCSI_DEBUG_LOG
473 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
474 #endif /* IDESCSI_DEBUG_LOG */
475 }
476 }
477 if (ireason.b.io) {
478 clear_bit(PC_WRITING, &pc->flags);
479 if (pc->sg)
480 idescsi_input_buffers(drive, pc, bcount.all);
481 else
482 HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
483 } else {
484 set_bit(PC_WRITING, &pc->flags);
485 if (pc->sg)
486 idescsi_output_buffers (drive, pc, bcount.all);
487 else
488 HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
489 }
490 /* Update the current position */
491 pc->actually_transferred += bcount.all;
492 pc->current_position += bcount.all;
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 atapi_ireason_t ireason;
505 ide_startstop_t startstop;
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.all = HWIF(drive)->INB(IDE_IREASON_REG);
513 if (!ireason.b.cod || ireason.b.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 atapi_feature_t feature;
577 atapi_bcount_t bcount;
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 bcount.all = min(pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */
583
584 feature.all = 0;
585 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
586 hwif->sg_mapped = 1;
587 feature.b.dma = !hwif->dma_setup(drive);
588 hwif->sg_mapped = 0;
589 }
590
591 SELECT_DRIVE(drive);
592 if (IDE_CONTROL_REG)
593 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
594
595 HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
596 HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
597 HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
598
599 if (feature.b.dma)
600 set_bit(PC_DMA_OK, &pc->flags);
601
602 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
603 BUG_ON(HWGROUP(drive)->handler != NULL);
604 ide_set_handler(drive, &idescsi_transfer_pc,
605 get_timeout(pc), idescsi_expiry);
606 /* Issue the packet command */
607 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
608 return ide_started;
609 } else {
610 /* Issue the packet command */
611 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
612 return idescsi_transfer_pc(drive);
613 }
614 }
615
616 /*
617 * idescsi_do_request is our request handling function.
618 */
619 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
620 {
621 #if IDESCSI_DEBUG_LOG
622 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
623 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
624 #endif /* IDESCSI_DEBUG_LOG */
625
626 if (blk_sense_request(rq) || blk_special_request(rq)) {
627 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
628 }
629 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
630 idescsi_end_request (drive, 0, 0);
631 return ide_stopped;
632 }
633
634 #ifdef CONFIG_IDE_PROC_FS
635 static void idescsi_add_settings(ide_drive_t *drive)
636 {
637 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
638
639 /*
640 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
641 */
642 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
643 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
644 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
645 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
646 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
647 }
648 #else
649 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
650 #endif
651
652 /*
653 * Driver initialization.
654 */
655 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
656 {
657 if (drive->id && (drive->id->config & 0x0060) == 0x20)
658 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
659 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
660 #if IDESCSI_DEBUG_LOG
661 set_bit(IDESCSI_LOG_CMD, &scsi->log);
662 #endif /* IDESCSI_DEBUG_LOG */
663 idescsi_add_settings(drive);
664 }
665
666 static void ide_scsi_remove(ide_drive_t *drive)
667 {
668 struct Scsi_Host *scsihost = drive->driver_data;
669 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
670 struct gendisk *g = scsi->disk;
671
672 scsi_remove_host(scsihost);
673 ide_proc_unregister_driver(drive, scsi->driver);
674
675 ide_unregister_region(g);
676
677 drive->driver_data = NULL;
678 g->private_data = NULL;
679 put_disk(g);
680
681 ide_scsi_put(scsi);
682 }
683
684 static int ide_scsi_probe(ide_drive_t *);
685
686 #ifdef CONFIG_IDE_PROC_FS
687 static ide_proc_entry_t idescsi_proc[] = {
688 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
689 { NULL, 0, NULL, NULL }
690 };
691 #endif
692
693 static ide_driver_t idescsi_driver = {
694 .gen_driver = {
695 .owner = THIS_MODULE,
696 .name = "ide-scsi",
697 .bus = &ide_bus_type,
698 },
699 .probe = ide_scsi_probe,
700 .remove = ide_scsi_remove,
701 .version = IDESCSI_VERSION,
702 .media = ide_scsi,
703 .supports_dsc_overlap = 0,
704 .do_request = idescsi_do_request,
705 .end_request = idescsi_end_request,
706 .error = idescsi_atapi_error,
707 .abort = idescsi_atapi_abort,
708 #ifdef CONFIG_IDE_PROC_FS
709 .proc = idescsi_proc,
710 #endif
711 };
712
713 static int idescsi_ide_open(struct inode *inode, struct file *filp)
714 {
715 struct gendisk *disk = inode->i_bdev->bd_disk;
716 struct ide_scsi_obj *scsi;
717
718 if (!(scsi = ide_scsi_get(disk)))
719 return -ENXIO;
720
721 return 0;
722 }
723
724 static int idescsi_ide_release(struct inode *inode, struct file *filp)
725 {
726 struct gendisk *disk = inode->i_bdev->bd_disk;
727 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
728
729 ide_scsi_put(scsi);
730
731 return 0;
732 }
733
734 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
735 unsigned int cmd, unsigned long arg)
736 {
737 struct block_device *bdev = inode->i_bdev;
738 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
739 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
740 }
741
742 static struct block_device_operations idescsi_ops = {
743 .owner = THIS_MODULE,
744 .open = idescsi_ide_open,
745 .release = idescsi_ide_release,
746 .ioctl = idescsi_ide_ioctl,
747 };
748
749 static int idescsi_slave_configure(struct scsi_device * sdp)
750 {
751 /* Configure detected device */
752 sdp->use_10_for_rw = 1;
753 sdp->use_10_for_ms = 1;
754 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
755 return 0;
756 }
757
758 static const char *idescsi_info (struct Scsi_Host *host)
759 {
760 return "SCSI host adapter emulation for IDE ATAPI devices";
761 }
762
763 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
764 {
765 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
766
767 if (cmd == SG_SET_TRANSFORM) {
768 if (arg)
769 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
770 else
771 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
772 return 0;
773 } else if (cmd == SG_GET_TRANSFORM)
774 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
775 return -EINVAL;
776 }
777
778 static int idescsi_queue (struct scsi_cmnd *cmd,
779 void (*done)(struct scsi_cmnd *))
780 {
781 struct Scsi_Host *host = cmd->device->host;
782 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
783 ide_drive_t *drive = scsi->drive;
784 struct request *rq = NULL;
785 idescsi_pc_t *pc = NULL;
786
787 if (!drive) {
788 scmd_printk (KERN_ERR, cmd, "drive not present\n");
789 goto abort;
790 }
791 scsi = drive_to_idescsi(drive);
792 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
793 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
794 if (rq == NULL || pc == NULL) {
795 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
796 goto abort;
797 }
798
799 memset (pc->c, 0, 12);
800 pc->flags = 0;
801 pc->rq = rq;
802 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
803 pc->buffer = NULL;
804 pc->sg = scsi_sglist(cmd);
805 pc->sg_cnt = scsi_sg_count(cmd);
806 pc->b_count = 0;
807 pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
808 pc->scsi_cmd = cmd;
809 pc->done = done;
810 pc->timeout = jiffies + cmd->timeout_per_command;
811
812 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
813 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
814 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
815 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
816 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
817 ide_scsi_hex_dump(pc->c, 12);
818 }
819 }
820
821 ide_init_drive_cmd (rq);
822 rq->special = (char *) pc;
823 rq->cmd_type = REQ_TYPE_SPECIAL;
824 spin_unlock_irq(host->host_lock);
825 rq->rq_disk = scsi->disk;
826 (void) ide_do_drive_cmd (drive, rq, ide_end);
827 spin_lock_irq(host->host_lock);
828 return 0;
829 abort:
830 kfree (pc);
831 kfree (rq);
832 cmd->result = DID_ERROR << 16;
833 done(cmd);
834 return 0;
835 }
836
837 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
838 {
839 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
840 ide_drive_t *drive = scsi->drive;
841 int busy;
842 int ret = FAILED;
843
844 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
845
846 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
847 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
848
849 if (!drive) {
850 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
851 WARN_ON(1);
852 goto no_drive;
853 }
854
855 /* First give it some more time, how much is "right" is hard to say :-( */
856
857 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
858 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
859 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
860
861 spin_lock_irq(&ide_lock);
862
863 /* If there is no pc running we're done (our interrupt took care of it) */
864 if (!scsi->pc) {
865 ret = SUCCESS;
866 goto ide_unlock;
867 }
868
869 /* It's somewhere in flight. Does ide subsystem agree? */
870 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
871 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
872 /*
873 * FIXME - not sure this condition can ever occur
874 */
875 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
876
877 if (blk_sense_request(scsi->pc->rq))
878 kfree(scsi->pc->buffer);
879 kfree(scsi->pc->rq);
880 kfree(scsi->pc);
881 scsi->pc = NULL;
882
883 ret = SUCCESS;
884 }
885
886 ide_unlock:
887 spin_unlock_irq(&ide_lock);
888 no_drive:
889 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
890 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
891
892 return ret;
893 }
894
895 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
896 {
897 struct request *req;
898 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
899 ide_drive_t *drive = scsi->drive;
900 int ready = 0;
901 int ret = SUCCESS;
902
903 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
904
905 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
906 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
907
908 if (!drive) {
909 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
910 WARN_ON(1);
911 return FAILED;
912 }
913
914 spin_lock_irq(cmd->device->host->host_lock);
915 spin_lock(&ide_lock);
916
917 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
918 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
919 spin_unlock(&ide_lock);
920 spin_unlock_irq(cmd->device->host->host_lock);
921 return FAILED;
922 }
923
924 /* kill current request */
925 blkdev_dequeue_request(req);
926 end_that_request_last(req, 0);
927 if (blk_sense_request(req))
928 kfree(scsi->pc->buffer);
929 kfree(scsi->pc);
930 scsi->pc = NULL;
931 kfree(req);
932
933 /* now nuke the drive queue */
934 while ((req = elv_next_request(drive->queue))) {
935 blkdev_dequeue_request(req);
936 end_that_request_last(req, 0);
937 }
938
939 HWGROUP(drive)->rq = NULL;
940 HWGROUP(drive)->handler = NULL;
941 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
942 spin_unlock(&ide_lock);
943
944 ide_do_reset(drive);
945
946 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
947
948 do {
949 spin_unlock_irq(cmd->device->host->host_lock);
950 msleep(50);
951 spin_lock_irq(cmd->device->host->host_lock);
952 } while ( HWGROUP(drive)->handler );
953
954 ready = drive_is_ready(drive);
955 HWGROUP(drive)->busy--;
956 if (!ready) {
957 printk (KERN_ERR "ide-scsi: reset failed!\n");
958 ret = FAILED;
959 }
960
961 spin_unlock_irq(cmd->device->host->host_lock);
962 return ret;
963 }
964
965 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
966 sector_t capacity, int *parm)
967 {
968 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
969 ide_drive_t *drive = idescsi->drive;
970
971 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
972 parm[0] = drive->bios_head;
973 parm[1] = drive->bios_sect;
974 parm[2] = drive->bios_cyl;
975 }
976 return 0;
977 }
978
979 static struct scsi_host_template idescsi_template = {
980 .module = THIS_MODULE,
981 .name = "idescsi",
982 .info = idescsi_info,
983 .slave_configure = idescsi_slave_configure,
984 .ioctl = idescsi_ioctl,
985 .queuecommand = idescsi_queue,
986 .eh_abort_handler = idescsi_eh_abort,
987 .eh_host_reset_handler = idescsi_eh_reset,
988 .bios_param = idescsi_bios,
989 .can_queue = 40,
990 .this_id = -1,
991 .sg_tablesize = 256,
992 .cmd_per_lun = 5,
993 .max_sectors = 128,
994 .use_clustering = DISABLE_CLUSTERING,
995 .emulated = 1,
996 .proc_name = "ide-scsi",
997 };
998
999 static int ide_scsi_probe(ide_drive_t *drive)
1000 {
1001 idescsi_scsi_t *idescsi;
1002 struct Scsi_Host *host;
1003 struct gendisk *g;
1004 static int warned;
1005 int err = -ENOMEM;
1006
1007 if (!warned && drive->media == ide_cdrom) {
1008 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1009 warned = 1;
1010 }
1011
1012 if (idescsi_nocd && drive->media == ide_cdrom)
1013 return -ENODEV;
1014
1015 if (!strstr("ide-scsi", drive->driver_req) ||
1016 !drive->present ||
1017 drive->media == ide_disk ||
1018 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1019 return -ENODEV;
1020
1021 g = alloc_disk(1 << PARTN_BITS);
1022 if (!g)
1023 goto out_host_put;
1024
1025 ide_init_disk(g, drive);
1026
1027 host->max_id = 1;
1028
1029 #if IDESCSI_DEBUG_LOG
1030 if (drive->id->last_lun)
1031 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1032 #endif
1033 if ((drive->id->last_lun & 0x7) != 7)
1034 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1035 else
1036 host->max_lun = 1;
1037
1038 drive->driver_data = host;
1039 idescsi = scsihost_to_idescsi(host);
1040 idescsi->drive = drive;
1041 idescsi->driver = &idescsi_driver;
1042 idescsi->host = host;
1043 idescsi->disk = g;
1044 g->private_data = &idescsi->driver;
1045 ide_proc_register_driver(drive, &idescsi_driver);
1046 err = 0;
1047 idescsi_setup(drive, idescsi);
1048 g->fops = &idescsi_ops;
1049 ide_register_region(g);
1050 err = scsi_add_host(host, &drive->gendev);
1051 if (!err) {
1052 scsi_scan_host(host);
1053 return 0;
1054 }
1055 /* fall through on error */
1056 ide_unregister_region(g);
1057 ide_proc_unregister_driver(drive, &idescsi_driver);
1058
1059 put_disk(g);
1060 out_host_put:
1061 scsi_host_put(host);
1062 return err;
1063 }
1064
1065 static int __init init_idescsi_module(void)
1066 {
1067 return driver_register(&idescsi_driver.gen_driver);
1068 }
1069
1070 static void __exit exit_idescsi_module(void)
1071 {
1072 driver_unregister(&idescsi_driver.gen_driver);
1073 }
1074
1075 module_param(idescsi_nocd, int, 0600);
1076 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1077 module_init(init_idescsi_module);
1078 module_exit(exit_idescsi_module);
1079 MODULE_LICENSE("GPL");
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