?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[PATCH] ide-scsi highmem cleanup
[linux-2.6/verdex.git] / drivers / scsi / ide-scsi.c
blob00d6a6657ebc3ec78f19d28e25edb2e3354513d4
1 /*
2 * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999
3 *
4 * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
5 */
6
7 /*
8 * Emulation of a SCSI host adapter for IDE ATAPI devices.
9 *
10 * With this driver, one can use the Linux SCSI drivers instead of the
11 * native IDE ATAPI drivers.
12 *
13 * Ver 0.1 Dec 3 96 Initial version.
14 * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
15 * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
16 * to Janos Farkas for pointing this out.
17 * Avoid using bitfields in structures for m68k.
18 * Added Scatter/Gather and DMA support.
19 * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
20 * Use variable timeout for each command.
21 * Ver 0.5 Jan 2 98 Fix previous PD/CD support.
22 * Allow disabling of SCSI-6 to SCSI-10 transformation.
23 * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
24 * for access through /dev/sg.
25 * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
26 * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
27 * detection of devices with CONFIG_SCSI_MULTI_LUN
28 * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
29 * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
30 * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
31 * Ver 0.92 Dec 31 02 Implement new SCSI mid level API
32 */
33
34 #define IDESCSI_VERSION "0.92"
35
36 #include <linux/module.h>
37 #include <linux/config.h>
38 #include <linux/types.h>
39 #include <linux/string.h>
40 #include <linux/kernel.h>
41 #include <linux/mm.h>
42 #include <linux/ioport.h>
43 #include <linux/blkdev.h>
44 #include <linux/errno.h>
45 #include <linux/hdreg.h>
46 #include <linux/slab.h>
47 #include <linux/ide.h>
48 #include <linux/scatterlist.h>
49 #include <linux/delay.h>
50
51 #include <asm/io.h>
52 #include <asm/bitops.h>
53 #include <asm/uaccess.h>
54
55 #include <scsi/scsi.h>
56 #include <scsi/scsi_cmnd.h>
57 #include <scsi/scsi_device.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_tcq.h>
60 #include <scsi/sg.h>
61
62 #define IDESCSI_DEBUG_LOG 0
63
64 typedef struct idescsi_pc_s {
65 u8 c[12]; /* Actual packet bytes */
66 int request_transfer; /* Bytes to transfer */
67 int actually_transferred; /* Bytes actually transferred */
68 int buffer_size; /* Size of our data buffer */
69 struct request *rq; /* The corresponding request */
70 u8 *buffer; /* Data buffer */
71 u8 *current_position; /* Pointer into the above buffer */
72 struct scatterlist *sg; /* Scatter gather table */
73 int b_count; /* Bytes transferred from current entry */
74 struct scsi_cmnd *scsi_cmd; /* SCSI command */
75 void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
76 unsigned long flags; /* Status/Action flags */
77 unsigned long timeout; /* Command timeout */
78 } idescsi_pc_t;
79
80 /*
81 * Packet command status bits.
82 */
83 #define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
84 #define PC_WRITING 1 /* Data direction */
85 #define PC_TRANSFORM 2 /* transform SCSI commands */
86 #define PC_TIMEDOUT 3 /* command timed out */
87 #define PC_DMA_OK 4 /* Use DMA */
88
89 /*
90 * SCSI command transformation layer
91 */
92 #define IDESCSI_TRANSFORM 0 /* Enable/Disable transformation */
93 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
94
95 /*
96 * Log flags
97 */
98 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
99
100 typedef struct ide_scsi_obj {
101 ide_drive_t *drive;
102 ide_driver_t *driver;
103 struct gendisk *disk;
104 struct Scsi_Host *host;
105
106 idescsi_pc_t *pc; /* Current packet command */
107 unsigned long flags; /* Status/Action flags */
108 unsigned long transform; /* SCSI cmd translation layer */
109 unsigned long log; /* log flags */
110 } idescsi_scsi_t;
111
112 static DECLARE_MUTEX(idescsi_ref_sem);
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 down(&idescsi_ref_sem);
122 scsi = ide_scsi_g(disk);
123 if (scsi)
124 scsi_host_get(scsi->host);
125 up(&idescsi_ref_sem);
126 return scsi;
127 }
128
129 static void ide_scsi_put(struct ide_scsi_obj *scsi)
130 {
131 down(&idescsi_ref_sem);
132 scsi_host_put(scsi->host);
133 up(&idescsi_ref_sem);
134 }
135
136 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
137 {
138 return (idescsi_scsi_t*) (&host[1]);
139 }
140
141 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
142 {
143 return scsihost_to_idescsi(ide_drive->driver_data);
144 }
145
146 /*
147 * Per ATAPI device status bits.
148 */
149 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
150
151 /*
152 * ide-scsi requests.
153 */
154 #define IDESCSI_PC_RQ 90
155
156 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
157 {
158 while (bcount--)
159 (void) HWIF(drive)->INB(IDE_DATA_REG);
160 }
161
162 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
163 {
164 while (bcount--)
165 HWIF(drive)->OUTB(0, IDE_DATA_REG);
166 }
167
168 /*
169 * PIO data transfer routines using the scatter gather table.
170 */
171 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
172 {
173 int count;
174 char *buf;
175
176 while (bcount) {
177 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
178 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
179 idescsi_discard_data (drive, bcount);
180 return;
181 }
182 count = min(pc->sg->length - pc->b_count, bcount);
183 buf = kmap_atomic(pc->sg->page, KM_IRQ0);
184 drive->hwif->atapi_input_bytes(drive,
185 buf + pc->b_count + pc->sg->offset, count);
186 kunmap_atomic(buf, KM_IRQ0);
187 bcount -= count;
188 pc->b_count += count;
189 if (pc->b_count == pc->sg->length) {
190 pc->sg++;
191 pc->b_count = 0;
192 }
193 }
194 }
195
196 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
197 {
198 int count;
199 char *buf;
200
201 while (bcount) {
202 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
203 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
204 idescsi_output_zeros (drive, bcount);
205 return;
206 }
207 count = min(pc->sg->length - pc->b_count, bcount);
208 buf = kmap_atomic(pc->sg->page, KM_IRQ0);
209 drive->hwif->atapi_output_bytes(drive,
210 buf + pc->b_count + pc->sg->offset, count);
211 kunmap_atomic(buf, KM_IRQ0);
212 bcount -= count;
213 pc->b_count += count;
214 if (pc->b_count == pc->sg->length) {
215 pc->sg++;
216 pc->b_count = 0;
217 }
218 }
219 }
220
221 /*
222 * Most of the SCSI commands are supported directly by ATAPI devices.
223 * idescsi_transform_pc handles the few exceptions.
224 */
225 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
226 {
227 u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
228 char *atapi_buf;
229
230 if (!test_bit(PC_TRANSFORM, &pc->flags))
231 return;
232 if (drive->media == ide_cdrom || drive->media == ide_optical) {
233 if (c[0] == READ_6 || c[0] == WRITE_6) {
234 c[8] = c[4]; c[5] = c[3]; c[4] = c[2];
235 c[3] = c[1] & 0x1f; c[2] = 0; c[1] &= 0xe0;
236 c[0] += (READ_10 - READ_6);
237 }
238 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
239 unsigned short new_len;
240 if (!scsi_buf)
241 return;
242 if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
243 return;
244 memset(atapi_buf, 0, pc->buffer_size + 4);
245 memset (c, 0, 12);
246 c[0] = sc[0] | 0x40;
247 c[1] = sc[1];
248 c[2] = sc[2];
249 new_len = sc[4] + 4;
250 c[8] = new_len;
251 c[7] = new_len >> 8;
252 c[9] = sc[5];
253 if (c[0] == MODE_SELECT_10) {
254 atapi_buf[1] = scsi_buf[0]; /* Mode data length */
255 atapi_buf[2] = scsi_buf[1]; /* Medium type */
256 atapi_buf[3] = scsi_buf[2]; /* Device specific parameter */
257 atapi_buf[7] = scsi_buf[3]; /* Block descriptor length */
258 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
259 }
260 pc->buffer = atapi_buf;
261 pc->request_transfer += 4;
262 pc->buffer_size += 4;
263 }
264 }
265 }
266
267 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
268 {
269 u8 *atapi_buf = pc->buffer;
270 u8 *sc = pc->scsi_cmd->cmnd;
271 u8 *scsi_buf = pc->scsi_cmd->request_buffer;
272
273 if (!test_bit(PC_TRANSFORM, &pc->flags))
274 return;
275 if (drive->media == ide_cdrom || drive->media == ide_optical) {
276 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
277 scsi_buf[0] = atapi_buf[1]; /* Mode data length */
278 scsi_buf[1] = atapi_buf[2]; /* Medium type */
279 scsi_buf[2] = atapi_buf[3]; /* Device specific parameter */
280 scsi_buf[3] = atapi_buf[7]; /* Block descriptor length */
281 memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
282 }
283 if (pc->c[0] == INQUIRY) {
284 scsi_buf[2] |= 2; /* ansi_revision */
285 scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
286 }
287 }
288 if (atapi_buf && atapi_buf != scsi_buf)
289 kfree(atapi_buf);
290 }
291
292 static void hexdump(u8 *x, int len)
293 {
294 int i;
295
296 printk("[ ");
297 for (i = 0; i < len; i++)
298 printk("%x ", x[i]);
299 printk("]\n");
300 }
301
302 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
303 {
304 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
305 idescsi_pc_t *pc;
306 struct request *rq;
307 u8 *buf;
308
309 /* stuff a sense request in front of our current request */
310 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
311 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
312 buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
313 if (pc == NULL || rq == NULL || buf == NULL) {
314 if (pc) kfree(pc);
315 if (rq) kfree(rq);
316 if (buf) kfree(buf);
317 return -ENOMEM;
318 }
319 memset (pc, 0, sizeof (idescsi_pc_t));
320 memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
321 ide_init_drive_cmd(rq);
322 rq->special = (char *) pc;
323 pc->rq = rq;
324 pc->buffer = buf;
325 pc->c[0] = REQUEST_SENSE;
326 pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
327 rq->flags = REQ_SENSE;
328 pc->timeout = jiffies + WAIT_READY;
329 /* NOTE! Save the failed packet command in "rq->buffer" */
330 rq->buffer = (void *) failed_command->special;
331 pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
332 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
333 printk ("ide-scsi: %s: queue cmd = ", drive->name);
334 hexdump(pc->c, 6);
335 }
336 rq->rq_disk = scsi->disk;
337 return ide_do_drive_cmd(drive, rq, ide_preempt);
338 }
339
340 static int idescsi_end_request(ide_drive_t *, int, int);
341
342 static ide_startstop_t
343 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
344 {
345 if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
346 /* force an abort */
347 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
348
349 rq->errors++;
350
351 idescsi_end_request(drive, 0, 0);
352
353 return ide_stopped;
354 }
355
356 static ide_startstop_t
357 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
358 {
359 #if IDESCSI_DEBUG_LOG
360 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
361 ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
362 #endif
363 rq->errors |= ERROR_MAX;
364
365 idescsi_end_request(drive, 0, 0);
366
367 return ide_stopped;
368 }
369
370 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
371 {
372 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
373 struct request *rq = HWGROUP(drive)->rq;
374 idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
375 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
376 struct Scsi_Host *host;
377 u8 *scsi_buf;
378 unsigned long flags;
379
380 if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
381 ide_end_request(drive, uptodate, nrsecs);
382 return 0;
383 }
384 ide_end_drive_cmd (drive, 0, 0);
385 if (rq->flags & REQ_SENSE) {
386 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
387 if (log) {
388 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
389 hexdump(pc->buffer,16);
390 }
391 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
392 kfree(pc->buffer);
393 kfree(pc);
394 kfree(rq);
395 pc = opc;
396 rq = pc->rq;
397 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
398 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
399 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
400 if (log)
401 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
402 drive->name, pc->scsi_cmd->serial_number);
403 pc->scsi_cmd->result = DID_TIME_OUT << 16;
404 } else if (rq->errors >= ERROR_MAX) {
405 pc->scsi_cmd->result = DID_ERROR << 16;
406 if (log)
407 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
408 } else if (rq->errors) {
409 if (log)
410 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
411 if (!idescsi_check_condition(drive, rq))
412 /* we started a request sense, so we'll be back, exit for now */
413 return 0;
414 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
415 } else {
416 pc->scsi_cmd->result = DID_OK << 16;
417 idescsi_transform_pc2 (drive, pc);
418 if (log) {
419 printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
420 if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
421 printk(", rst = ");
422 scsi_buf = pc->scsi_cmd->request_buffer;
423 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
424 } else printk("\n");
425 }
426 }
427 host = pc->scsi_cmd->device->host;
428 spin_lock_irqsave(host->host_lock, flags);
429 pc->done(pc->scsi_cmd);
430 spin_unlock_irqrestore(host->host_lock, flags);
431 kfree(pc);
432 kfree(rq);
433 scsi->pc = NULL;
434 return 0;
435 }
436
437 static inline unsigned long get_timeout(idescsi_pc_t *pc)
438 {
439 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
440 }
441
442 static int idescsi_expiry(ide_drive_t *drive)
443 {
444 idescsi_scsi_t *scsi = drive->driver_data;
445 idescsi_pc_t *pc = scsi->pc;
446
447 #if IDESCSI_DEBUG_LOG
448 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
449 #endif
450 set_bit(PC_TIMEDOUT, &pc->flags);
451
452 return 0; /* we do not want the ide subsystem to retry */
453 }
454
455 /*
456 * Our interrupt handler.
457 */
458 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
459 {
460 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
461 idescsi_pc_t *pc=scsi->pc;
462 struct request *rq = pc->rq;
463 atapi_bcount_t bcount;
464 atapi_status_t status;
465 atapi_ireason_t ireason;
466 atapi_feature_t feature;
467
468 unsigned int temp;
469
470 #if IDESCSI_DEBUG_LOG
471 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
472 #endif /* IDESCSI_DEBUG_LOG */
473
474 if (test_bit(PC_TIMEDOUT, &pc->flags)){
475 #if IDESCSI_DEBUG_LOG
476 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
477 pc->scsi_cmd->serial_number, jiffies);
478 #endif
479 /* end this request now - scsi should retry it*/
480 idescsi_end_request (drive, 1, 0);
481 return ide_stopped;
482 }
483 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
484 #if IDESCSI_DEBUG_LOG
485 printk ("ide-scsi: %s: DMA complete\n", drive->name);
486 #endif /* IDESCSI_DEBUG_LOG */
487 pc->actually_transferred=pc->request_transfer;
488 (void) HWIF(drive)->ide_dma_end(drive);
489 }
490
491 feature.all = 0;
492 /* Clear the interrupt */
493 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
494
495 if (!status.b.drq) {
496 /* No more interrupts */
497 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
498 printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
499 local_irq_enable();
500 if (status.b.check)
501 rq->errors++;
502 idescsi_end_request (drive, 1, 0);
503 return ide_stopped;
504 }
505 bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG);
506 bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG);
507 ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
508
509 if (ireason.b.cod) {
510 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
511 return ide_do_reset (drive);
512 }
513 if (ireason.b.io) {
514 temp = pc->actually_transferred + bcount.all;
515 if (temp > pc->request_transfer) {
516 if (temp > pc->buffer_size) {
517 printk(KERN_ERR "ide-scsi: The scsi wants to "
518 "send us more data than expected "
519 "- discarding data\n");
520 temp = pc->buffer_size - pc->actually_transferred;
521 if (temp) {
522 clear_bit(PC_WRITING, &pc->flags);
523 if (pc->sg)
524 idescsi_input_buffers(drive, pc, temp);
525 else
526 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
527 printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
528 }
529 pc->actually_transferred += temp;
530 pc->current_position += temp;
531 idescsi_discard_data(drive, bcount.all - temp);
532 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
533 return ide_started;
534 }
535 #if IDESCSI_DEBUG_LOG
536 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
537 #endif /* IDESCSI_DEBUG_LOG */
538 }
539 }
540 if (ireason.b.io) {
541 clear_bit(PC_WRITING, &pc->flags);
542 if (pc->sg)
543 idescsi_input_buffers(drive, pc, bcount.all);
544 else
545 HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
546 } else {
547 set_bit(PC_WRITING, &pc->flags);
548 if (pc->sg)
549 idescsi_output_buffers (drive, pc, bcount.all);
550 else
551 HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
552 }
553 /* Update the current position */
554 pc->actually_transferred += bcount.all;
555 pc->current_position += bcount.all;
556
557 /* And set the interrupt handler again */
558 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
559 return ide_started;
560 }
561
562 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
563 {
564 ide_hwif_t *hwif = drive->hwif;
565 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
566 idescsi_pc_t *pc = scsi->pc;
567 atapi_ireason_t ireason;
568 ide_startstop_t startstop;
569
570 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
571 printk(KERN_ERR "ide-scsi: Strange, packet command "
572 "initiated yet DRQ isn't asserted\n");
573 return startstop;
574 }
575 ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
576 if (!ireason.b.cod || ireason.b.io) {
577 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
578 "issuing a packet command\n");
579 return ide_do_reset (drive);
580 }
581 if (HWGROUP(drive)->handler != NULL)
582 BUG();
583 /* Set the interrupt routine */
584 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
585 /* Send the actual packet */
586 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
587 if (test_bit (PC_DMA_OK, &pc->flags)) {
588 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
589 hwif->dma_start(drive);
590 }
591 return ide_started;
592 }
593
594 static inline int idescsi_set_direction(idescsi_pc_t *pc)
595 {
596 switch (pc->c[0]) {
597 case READ_6: case READ_10: case READ_12:
598 clear_bit(PC_WRITING, &pc->flags);
599 return 0;
600 case WRITE_6: case WRITE_10: case WRITE_12:
601 set_bit(PC_WRITING, &pc->flags);
602 return 0;
603 default:
604 return 1;
605 }
606 }
607
608 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
609 {
610 ide_hwif_t *hwif = drive->hwif;
611 struct scatterlist *sg, *scsi_sg;
612 int segments;
613
614 if (!pc->request_transfer || pc->request_transfer % 1024)
615 return 1;
616
617 if (idescsi_set_direction(pc))
618 return 1;
619
620 sg = hwif->sg_table;
621 scsi_sg = pc->scsi_cmd->request_buffer;
622 segments = pc->scsi_cmd->use_sg;
623
624 if (segments > hwif->sg_max_nents)
625 return 1;
626
627 if (!segments) {
628 hwif->sg_nents = 1;
629 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
630 } else {
631 hwif->sg_nents = segments;
632 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
633 }
634
635 return 0;
636 }
637
638 /*
639 * Issue a packet command
640 */
641 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
642 {
643 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
644 ide_hwif_t *hwif = drive->hwif;
645 atapi_feature_t feature;
646 atapi_bcount_t bcount;
647
648 scsi->pc=pc; /* Set the current packet command */
649 pc->actually_transferred=0; /* We haven't transferred any data yet */
650 pc->current_position=pc->buffer;
651 bcount.all = min(pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */
652
653 feature.all = 0;
654 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
655 hwif->sg_mapped = 1;
656 feature.b.dma = !hwif->dma_setup(drive);
657 hwif->sg_mapped = 0;
658 }
659
660 SELECT_DRIVE(drive);
661 if (IDE_CONTROL_REG)
662 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
663
664 HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
665 HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
666 HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
667
668 if (feature.b.dma)
669 set_bit(PC_DMA_OK, &pc->flags);
670
671 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
672 if (HWGROUP(drive)->handler != NULL)
673 BUG();
674 ide_set_handler(drive, &idescsi_transfer_pc,
675 get_timeout(pc), idescsi_expiry);
676 /* Issue the packet command */
677 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
678 return ide_started;
679 } else {
680 /* Issue the packet command */
681 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
682 return idescsi_transfer_pc(drive);
683 }
684 }
685
686 /*
687 * idescsi_do_request is our request handling function.
688 */
689 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
690 {
691 #if IDESCSI_DEBUG_LOG
692 printk (KERN_INFO "rq_status: %d, dev: %s, cmd: %x, errors: %d\n",rq->rq_status, rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
693 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
694 #endif /* IDESCSI_DEBUG_LOG */
695
696 if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
697 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
698 }
699 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
700 idescsi_end_request (drive, 0, 0);
701 return ide_stopped;
702 }
703
704 static void idescsi_add_settings(ide_drive_t *drive)
705 {
706 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
707
708 /*
709 * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function
710 */
711 ide_add_setting(drive, "bios_cyl", SETTING_RW, -1, -1, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
712 ide_add_setting(drive, "bios_head", SETTING_RW, -1, -1, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
713 ide_add_setting(drive, "bios_sect", SETTING_RW, -1, -1, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
714 ide_add_setting(drive, "transform", SETTING_RW, -1, -1, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
715 ide_add_setting(drive, "log", SETTING_RW, -1, -1, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
716 }
717
718 /*
719 * Driver initialization.
720 */
721 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
722 {
723 if (drive->id && (drive->id->config & 0x0060) == 0x20)
724 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
725 set_bit(IDESCSI_TRANSFORM, &scsi->transform);
726 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
727 #if IDESCSI_DEBUG_LOG
728 set_bit(IDESCSI_LOG_CMD, &scsi->log);
729 #endif /* IDESCSI_DEBUG_LOG */
730 idescsi_add_settings(drive);
731 }
732
733 static int ide_scsi_remove(struct device *dev)
734 {
735 ide_drive_t *drive = to_ide_device(dev);
736 struct Scsi_Host *scsihost = drive->driver_data;
737 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
738 struct gendisk *g = scsi->disk;
739
740 ide_unregister_subdriver(drive, scsi->driver);
741
742 ide_unregister_region(g);
743
744 drive->driver_data = NULL;
745 g->private_data = NULL;
746 put_disk(g);
747
748 scsi_remove_host(scsihost);
749 ide_scsi_put(scsi);
750
751 return 0;
752 }
753
754 static int ide_scsi_probe(struct device *);
755
756 #ifdef CONFIG_PROC_FS
757 static ide_proc_entry_t idescsi_proc[] = {
758 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
759 { NULL, 0, NULL, NULL }
760 };
761 #else
762 # define idescsi_proc NULL
763 #endif
764
765 static ide_driver_t idescsi_driver = {
766 .owner = THIS_MODULE,
767 .gen_driver = {
768 .name = "ide-scsi",
769 .bus = &ide_bus_type,
770 .probe = ide_scsi_probe,
771 .remove = ide_scsi_remove,
772 },
773 .version = IDESCSI_VERSION,
774 .media = ide_scsi,
775 .supports_dsc_overlap = 0,
776 .proc = idescsi_proc,
777 .do_request = idescsi_do_request,
778 .end_request = idescsi_end_request,
779 .error = idescsi_atapi_error,
780 .abort = idescsi_atapi_abort,
781 };
782
783 static int idescsi_ide_open(struct inode *inode, struct file *filp)
784 {
785 struct gendisk *disk = inode->i_bdev->bd_disk;
786 struct ide_scsi_obj *scsi;
787 ide_drive_t *drive;
788
789 if (!(scsi = ide_scsi_get(disk)))
790 return -ENXIO;
791
792 drive = scsi->drive;
793
794 drive->usage++;
795
796 return 0;
797 }
798
799 static int idescsi_ide_release(struct inode *inode, struct file *filp)
800 {
801 struct gendisk *disk = inode->i_bdev->bd_disk;
802 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
803 ide_drive_t *drive = scsi->drive;
804
805 drive->usage--;
806
807 ide_scsi_put(scsi);
808
809 return 0;
810 }
811
812 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
813 unsigned int cmd, unsigned long arg)
814 {
815 struct block_device *bdev = inode->i_bdev;
816 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
817 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
818 }
819
820 static struct block_device_operations idescsi_ops = {
821 .owner = THIS_MODULE,
822 .open = idescsi_ide_open,
823 .release = idescsi_ide_release,
824 .ioctl = idescsi_ide_ioctl,
825 };
826
827 static int idescsi_slave_configure(struct scsi_device * sdp)
828 {
829 /* Configure detected device */
830 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
831 return 0;
832 }
833
834 static const char *idescsi_info (struct Scsi_Host *host)
835 {
836 return "SCSI host adapter emulation for IDE ATAPI devices";
837 }
838
839 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
840 {
841 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
842
843 if (cmd == SG_SET_TRANSFORM) {
844 if (arg)
845 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
846 else
847 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
848 return 0;
849 } else if (cmd == SG_GET_TRANSFORM)
850 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
851 return -EINVAL;
852 }
853
854 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
855 {
856 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
857
858 /* this was a layering violation and we can't support it
859 anymore, sorry. */
860 #if 0
861 struct gendisk *disk = cmd->request->rq_disk;
862
863 if (disk) {
864 struct Scsi_Device_Template **p = disk->private_data;
865 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
866 return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
867 }
868 #endif
869 return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
870 }
871
872 static int idescsi_queue (struct scsi_cmnd *cmd,
873 void (*done)(struct scsi_cmnd *))
874 {
875 struct Scsi_Host *host = cmd->device->host;
876 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
877 ide_drive_t *drive = scsi->drive;
878 struct request *rq = NULL;
879 idescsi_pc_t *pc = NULL;
880
881 if (!drive) {
882 printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->device->id);
883 goto abort;
884 }
885 scsi = drive_to_idescsi(drive);
886 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
887 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
888 if (rq == NULL || pc == NULL) {
889 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
890 goto abort;
891 }
892
893 memset (pc->c, 0, 12);
894 pc->flags = 0;
895 pc->rq = rq;
896 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
897 if (cmd->use_sg) {
898 pc->buffer = NULL;
899 pc->sg = cmd->request_buffer;
900 } else {
901 pc->buffer = cmd->request_buffer;
902 pc->sg = NULL;
903 }
904 pc->b_count = 0;
905 pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
906 pc->scsi_cmd = cmd;
907 pc->done = done;
908 pc->timeout = jiffies + cmd->timeout_per_command;
909
910 if (should_transform(drive, cmd))
911 set_bit(PC_TRANSFORM, &pc->flags);
912 idescsi_transform_pc1 (drive, pc);
913
914 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
915 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
916 hexdump(cmd->cmnd, cmd->cmd_len);
917 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
918 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
919 hexdump(pc->c, 12);
920 }
921 }
922
923 ide_init_drive_cmd (rq);
924 rq->special = (char *) pc;
925 rq->flags = REQ_SPECIAL;
926 spin_unlock_irq(host->host_lock);
927 rq->rq_disk = scsi->disk;
928 (void) ide_do_drive_cmd (drive, rq, ide_end);
929 spin_lock_irq(host->host_lock);
930 return 0;
931 abort:
932 if (pc) kfree (pc);
933 if (rq) kfree (rq);
934 cmd->result = DID_ERROR << 16;
935 done(cmd);
936 return 0;
937 }
938
939 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
940 {
941 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
942 ide_drive_t *drive = scsi->drive;
943 int busy;
944 int ret = FAILED;
945
946 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
947
948 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
949 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
950
951 if (!drive) {
952 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
953 WARN_ON(1);
954 goto no_drive;
955 }
956
957 /* First give it some more time, how much is "right" is hard to say :-( */
958
959 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
960 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
961 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
962
963 spin_lock_irq(&ide_lock);
964
965 /* If there is no pc running we're done (our interrupt took care of it) */
966 if (!scsi->pc) {
967 ret = SUCCESS;
968 goto ide_unlock;
969 }
970
971 /* It's somewhere in flight. Does ide subsystem agree? */
972 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
973 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
974 /*
975 * FIXME - not sure this condition can ever occur
976 */
977 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
978
979 if (scsi->pc->rq->flags & REQ_SENSE)
980 kfree(scsi->pc->buffer);
981 kfree(scsi->pc->rq);
982 kfree(scsi->pc);
983 scsi->pc = NULL;
984
985 ret = SUCCESS;
986 }
987
988 ide_unlock:
989 spin_unlock_irq(&ide_lock);
990 no_drive:
991 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
992 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
993
994 return ret;
995 }
996
997 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
998 {
999 struct request *req;
1000 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
1001 ide_drive_t *drive = scsi->drive;
1002 int ready = 0;
1003 int ret = SUCCESS;
1004
1005 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1006
1007 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1008 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1009
1010 if (!drive) {
1011 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1012 WARN_ON(1);
1013 return FAILED;
1014 }
1015
1016 spin_lock_irq(cmd->device->host->host_lock);
1017 spin_lock(&ide_lock);
1018
1019 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1020 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1021 spin_unlock(&ide_lock);
1022 spin_unlock_irq(cmd->device->host->host_lock);
1023 return FAILED;
1024 }
1025
1026 /* kill current request */
1027 blkdev_dequeue_request(req);
1028 end_that_request_last(req);
1029 if (req->flags & REQ_SENSE)
1030 kfree(scsi->pc->buffer);
1031 kfree(scsi->pc);
1032 scsi->pc = NULL;
1033 kfree(req);
1034
1035 /* now nuke the drive queue */
1036 while ((req = elv_next_request(drive->queue))) {
1037 blkdev_dequeue_request(req);
1038 end_that_request_last(req);
1039 }
1040
1041 HWGROUP(drive)->rq = NULL;
1042 HWGROUP(drive)->handler = NULL;
1043 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
1044 spin_unlock(&ide_lock);
1045
1046 ide_do_reset(drive);
1047
1048 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1049
1050 do {
1051 spin_unlock_irq(cmd->device->host->host_lock);
1052 msleep(50);
1053 spin_lock_irq(cmd->device->host->host_lock);
1054 } while ( HWGROUP(drive)->handler );
1055
1056 ready = drive_is_ready(drive);
1057 HWGROUP(drive)->busy--;
1058 if (!ready) {
1059 printk (KERN_ERR "ide-scsi: reset failed!\n");
1060 ret = FAILED;
1061 }
1062
1063 spin_unlock_irq(cmd->device->host->host_lock);
1064 return ret;
1065 }
1066
1067 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1068 sector_t capacity, int *parm)
1069 {
1070 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1071 ide_drive_t *drive = idescsi->drive;
1072
1073 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1074 parm[0] = drive->bios_head;
1075 parm[1] = drive->bios_sect;
1076 parm[2] = drive->bios_cyl;
1077 }
1078 return 0;
1079 }
1080
1081 static struct scsi_host_template idescsi_template = {
1082 .module = THIS_MODULE,
1083 .name = "idescsi",
1084 .info = idescsi_info,
1085 .slave_configure = idescsi_slave_configure,
1086 .ioctl = idescsi_ioctl,
1087 .queuecommand = idescsi_queue,
1088 .eh_abort_handler = idescsi_eh_abort,
1089 .eh_host_reset_handler = idescsi_eh_reset,
1090 .bios_param = idescsi_bios,
1091 .can_queue = 40,
1092 .this_id = -1,
1093 .sg_tablesize = 256,
1094 .cmd_per_lun = 5,
1095 .max_sectors = 128,
1096 .use_clustering = DISABLE_CLUSTERING,
1097 .emulated = 1,
1098 .proc_name = "ide-scsi",
1099 };
1100
1101 static int ide_scsi_probe(struct device *dev)
1102 {
1103 ide_drive_t *drive = to_ide_device(dev);
1104 idescsi_scsi_t *idescsi;
1105 struct Scsi_Host *host;
1106 struct gendisk *g;
1107 static int warned;
1108 int err = -ENOMEM;
1109
1110 if (!warned && drive->media == ide_cdrom) {
1111 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1112 warned = 1;
1113 }
1114
1115 if (!strstr("ide-scsi", drive->driver_req) ||
1116 !drive->present ||
1117 drive->media == ide_disk ||
1118 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1119 return -ENODEV;
1120
1121 g = alloc_disk(1 << PARTN_BITS);
1122 if (!g)
1123 goto out_host_put;
1124
1125 ide_init_disk(g, drive);
1126
1127 host->max_id = 1;
1128
1129 #if IDESCSI_DEBUG_LOG
1130 if (drive->id->last_lun)
1131 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1132 #endif
1133 if ((drive->id->last_lun & 0x7) != 7)
1134 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1135 else
1136 host->max_lun = 1;
1137
1138 drive->driver_data = host;
1139 idescsi = scsihost_to_idescsi(host);
1140 idescsi->drive = drive;
1141 idescsi->driver = &idescsi_driver;
1142 idescsi->host = host;
1143 idescsi->disk = g;
1144 g->private_data = &idescsi->driver;
1145 ide_register_subdriver(drive, &idescsi_driver);
1146 err = 0;
1147 idescsi_setup(drive, idescsi);
1148 g->fops = &idescsi_ops;
1149 ide_register_region(g);
1150 err = scsi_add_host(host, &drive->gendev);
1151 if (!err) {
1152 scsi_scan_host(host);
1153 return 0;
1154 }
1155 /* fall through on error */
1156 ide_unregister_region(g);
1157 ide_unregister_subdriver(drive, &idescsi_driver);
1158
1159 put_disk(g);
1160 out_host_put:
1161 scsi_host_put(host);
1162 return err;
1163 }
1164
1165 static int __init init_idescsi_module(void)
1166 {
1167 return driver_register(&idescsi_driver.gen_driver);
1168 }
1169
1170 static void __exit exit_idescsi_module(void)
1171 {
1172 driver_unregister(&idescsi_driver.gen_driver);
1173 }
1174
1175 module_init(init_idescsi_module);
1176 module_exit(exit_idescsi_module);
1177 MODULE_LICENSE("GPL");
Verdex Pro support