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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / scsi / ide-scsi.c
blob2e2486b035dd958352e648ff9012c2beeebc3552
1 /*
2 * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999
3 *
4 * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
5 */
6
7 /*
8 * Emulation of a SCSI host adapter for IDE ATAPI devices.
9 *
10 * With this driver, one can use the Linux SCSI drivers instead of the
11 * native IDE ATAPI drivers.
12 *
13 * Ver 0.1 Dec 3 96 Initial version.
14 * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
15 * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
16 * to Janos Farkas for pointing this out.
17 * Avoid using bitfields in structures for m68k.
18 * Added Scatter/Gather and DMA support.
19 * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
20 * Use variable timeout for each command.
21 * Ver 0.5 Jan 2 98 Fix previous PD/CD support.
22 * Allow disabling of SCSI-6 to SCSI-10 transformation.
23 * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
24 * for access through /dev/sg.
25 * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
26 * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
27 * detection of devices with CONFIG_SCSI_MULTI_LUN
28 * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
29 * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
30 * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
31 * Ver 0.92 Dec 31 02 Implement new SCSI mid level API
32 */
33
34 #define IDESCSI_VERSION "0.92"
35
36 #include <linux/module.h>
37 #include <linux/config.h>
38 #include <linux/types.h>
39 #include <linux/string.h>
40 #include <linux/kernel.h>
41 #include <linux/mm.h>
42 #include <linux/ioport.h>
43 #include <linux/blkdev.h>
44 #include <linux/errno.h>
45 #include <linux/hdreg.h>
46 #include <linux/slab.h>
47 #include <linux/ide.h>
48 #include <linux/scatterlist.h>
49
50 #include <asm/io.h>
51 #include <asm/bitops.h>
52 #include <asm/uaccess.h>
53
54 #include <scsi/scsi.h>
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_device.h>
57 #include <scsi/scsi_host.h>
58 #include <scsi/scsi_tcq.h>
59 #include <scsi/sg.h>
60
61 #define IDESCSI_DEBUG_LOG 0
62
63 typedef struct idescsi_pc_s {
64 u8 c[12]; /* Actual packet bytes */
65 int request_transfer; /* Bytes to transfer */
66 int actually_transferred; /* Bytes actually transferred */
67 int buffer_size; /* Size of our data buffer */
68 struct request *rq; /* The corresponding request */
69 u8 *buffer; /* Data buffer */
70 u8 *current_position; /* Pointer into the above buffer */
71 struct scatterlist *sg; /* Scatter gather table */
72 int b_count; /* Bytes transferred from current entry */
73 struct scsi_cmnd *scsi_cmd; /* SCSI command */
74 void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
75 unsigned long flags; /* Status/Action flags */
76 unsigned long timeout; /* Command timeout */
77 } idescsi_pc_t;
78
79 /*
80 * Packet command status bits.
81 */
82 #define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
83 #define PC_WRITING 1 /* Data direction */
84 #define PC_TRANSFORM 2 /* transform SCSI commands */
85 #define PC_TIMEDOUT 3 /* command timed out */
86 #define PC_DMA_OK 4 /* Use DMA */
87
88 /*
89 * SCSI command transformation layer
90 */
91 #define IDESCSI_TRANSFORM 0 /* Enable/Disable transformation */
92 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
93
94 /*
95 * Log flags
96 */
97 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
98
99 typedef struct ide_scsi_obj {
100 ide_drive_t *drive;
101 ide_driver_t *driver;
102 struct gendisk *disk;
103 struct Scsi_Host *host;
104
105 idescsi_pc_t *pc; /* Current packet command */
106 unsigned long flags; /* Status/Action flags */
107 unsigned long transform; /* SCSI cmd translation layer */
108 unsigned long log; /* log flags */
109 } idescsi_scsi_t;
110
111 static DECLARE_MUTEX(idescsi_ref_sem);
112
113 #define ide_scsi_g(disk) \
114 container_of((disk)->private_data, struct ide_scsi_obj, driver)
115
116 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
117 {
118 struct ide_scsi_obj *scsi = NULL;
119
120 down(&idescsi_ref_sem);
121 scsi = ide_scsi_g(disk);
122 if (scsi)
123 scsi_host_get(scsi->host);
124 up(&idescsi_ref_sem);
125 return scsi;
126 }
127
128 static void ide_scsi_put(struct ide_scsi_obj *scsi)
129 {
130 down(&idescsi_ref_sem);
131 scsi_host_put(scsi->host);
132 up(&idescsi_ref_sem);
133 }
134
135 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
136 {
137 return (idescsi_scsi_t*) (&host[1]);
138 }
139
140 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
141 {
142 return scsihost_to_idescsi(ide_drive->driver_data);
143 }
144
145 /*
146 * Per ATAPI device status bits.
147 */
148 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
149
150 /*
151 * ide-scsi requests.
152 */
153 #define IDESCSI_PC_RQ 90
154
155 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
156 {
157 while (bcount--)
158 (void) HWIF(drive)->INB(IDE_DATA_REG);
159 }
160
161 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
162 {
163 while (bcount--)
164 HWIF(drive)->OUTB(0, IDE_DATA_REG);
165 }
166
167 /*
168 * PIO data transfer routines using the scatter gather table.
169 */
170 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
171 {
172 int count;
173 char *buf;
174
175 while (bcount) {
176 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
177 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
178 idescsi_discard_data (drive, bcount);
179 return;
180 }
181 count = min(pc->sg->length - pc->b_count, bcount);
182 buf = page_address(pc->sg->page) + pc->sg->offset;
183 drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
184 bcount -= count; pc->b_count += count;
185 if (pc->b_count == pc->sg->length) {
186 pc->sg++;
187 pc->b_count = 0;
188 }
189 }
190 }
191
192 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
193 {
194 int count;
195 char *buf;
196
197 while (bcount) {
198 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
199 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
200 idescsi_output_zeros (drive, bcount);
201 return;
202 }
203 count = min(pc->sg->length - pc->b_count, bcount);
204 buf = page_address(pc->sg->page) + pc->sg->offset;
205 drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
206 bcount -= count; pc->b_count += count;
207 if (pc->b_count == pc->sg->length) {
208 pc->sg++;
209 pc->b_count = 0;
210 }
211 }
212 }
213
214 /*
215 * Most of the SCSI commands are supported directly by ATAPI devices.
216 * idescsi_transform_pc handles the few exceptions.
217 */
218 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
219 {
220 u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
221 char *atapi_buf;
222
223 if (!test_bit(PC_TRANSFORM, &pc->flags))
224 return;
225 if (drive->media == ide_cdrom || drive->media == ide_optical) {
226 if (c[0] == READ_6 || c[0] == WRITE_6) {
227 c[8] = c[4]; c[5] = c[3]; c[4] = c[2];
228 c[3] = c[1] & 0x1f; c[2] = 0; c[1] &= 0xe0;
229 c[0] += (READ_10 - READ_6);
230 }
231 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
232 unsigned short new_len;
233 if (!scsi_buf)
234 return;
235 if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
236 return;
237 memset(atapi_buf, 0, pc->buffer_size + 4);
238 memset (c, 0, 12);
239 c[0] = sc[0] | 0x40;
240 c[1] = sc[1];
241 c[2] = sc[2];
242 new_len = sc[4] + 4;
243 c[8] = new_len;
244 c[7] = new_len >> 8;
245 c[9] = sc[5];
246 if (c[0] == MODE_SELECT_10) {
247 atapi_buf[1] = scsi_buf[0]; /* Mode data length */
248 atapi_buf[2] = scsi_buf[1]; /* Medium type */
249 atapi_buf[3] = scsi_buf[2]; /* Device specific parameter */
250 atapi_buf[7] = scsi_buf[3]; /* Block descriptor length */
251 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
252 }
253 pc->buffer = atapi_buf;
254 pc->request_transfer += 4;
255 pc->buffer_size += 4;
256 }
257 }
258 }
259
260 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
261 {
262 u8 *atapi_buf = pc->buffer;
263 u8 *sc = pc->scsi_cmd->cmnd;
264 u8 *scsi_buf = pc->scsi_cmd->request_buffer;
265
266 if (!test_bit(PC_TRANSFORM, &pc->flags))
267 return;
268 if (drive->media == ide_cdrom || drive->media == ide_optical) {
269 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
270 scsi_buf[0] = atapi_buf[1]; /* Mode data length */
271 scsi_buf[1] = atapi_buf[2]; /* Medium type */
272 scsi_buf[2] = atapi_buf[3]; /* Device specific parameter */
273 scsi_buf[3] = atapi_buf[7]; /* Block descriptor length */
274 memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
275 }
276 if (pc->c[0] == INQUIRY) {
277 scsi_buf[2] |= 2; /* ansi_revision */
278 scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
279 }
280 }
281 if (atapi_buf && atapi_buf != scsi_buf)
282 kfree(atapi_buf);
283 }
284
285 static void hexdump(u8 *x, int len)
286 {
287 int i;
288
289 printk("[ ");
290 for (i = 0; i < len; i++)
291 printk("%x ", x[i]);
292 printk("]\n");
293 }
294
295 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
296 {
297 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
298 idescsi_pc_t *pc;
299 struct request *rq;
300 u8 *buf;
301
302 /* stuff a sense request in front of our current request */
303 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
304 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
305 buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
306 if (pc == NULL || rq == NULL || buf == NULL) {
307 if (pc) kfree(pc);
308 if (rq) kfree(rq);
309 if (buf) kfree(buf);
310 return -ENOMEM;
311 }
312 memset (pc, 0, sizeof (idescsi_pc_t));
313 memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
314 ide_init_drive_cmd(rq);
315 rq->special = (char *) pc;
316 pc->rq = rq;
317 pc->buffer = buf;
318 pc->c[0] = REQUEST_SENSE;
319 pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
320 rq->flags = REQ_SENSE;
321 pc->timeout = jiffies + WAIT_READY;
322 /* NOTE! Save the failed packet command in "rq->buffer" */
323 rq->buffer = (void *) failed_command->special;
324 pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
325 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
326 printk ("ide-scsi: %s: queue cmd = ", drive->name);
327 hexdump(pc->c, 6);
328 }
329 rq->rq_disk = scsi->disk;
330 return ide_do_drive_cmd(drive, rq, ide_preempt);
331 }
332
333 static int idescsi_end_request(ide_drive_t *, int, int);
334
335 static ide_startstop_t
336 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
337 {
338 if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
339 /* force an abort */
340 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
341
342 rq->errors++;
343
344 idescsi_end_request(drive, 0, 0);
345
346 return ide_stopped;
347 }
348
349 static ide_startstop_t
350 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
351 {
352 #if IDESCSI_DEBUG_LOG
353 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
354 ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
355 #endif
356 rq->errors |= ERROR_MAX;
357
358 idescsi_end_request(drive, 0, 0);
359
360 return ide_stopped;
361 }
362
363 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
364 {
365 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
366 struct request *rq = HWGROUP(drive)->rq;
367 idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
368 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
369 struct Scsi_Host *host;
370 u8 *scsi_buf;
371 unsigned long flags;
372
373 if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
374 ide_end_request(drive, uptodate, nrsecs);
375 return 0;
376 }
377 ide_end_drive_cmd (drive, 0, 0);
378 if (rq->flags & REQ_SENSE) {
379 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
380 if (log) {
381 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
382 hexdump(pc->buffer,16);
383 }
384 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
385 kfree(pc->buffer);
386 kfree(pc);
387 kfree(rq);
388 pc = opc;
389 rq = pc->rq;
390 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
391 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
392 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
393 if (log)
394 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
395 drive->name, pc->scsi_cmd->serial_number);
396 pc->scsi_cmd->result = DID_TIME_OUT << 16;
397 } else if (rq->errors >= ERROR_MAX) {
398 pc->scsi_cmd->result = DID_ERROR << 16;
399 if (log)
400 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
401 } else if (rq->errors) {
402 if (log)
403 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
404 if (!idescsi_check_condition(drive, rq))
405 /* we started a request sense, so we'll be back, exit for now */
406 return 0;
407 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
408 } else {
409 pc->scsi_cmd->result = DID_OK << 16;
410 idescsi_transform_pc2 (drive, pc);
411 if (log) {
412 printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
413 if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
414 printk(", rst = ");
415 scsi_buf = pc->scsi_cmd->request_buffer;
416 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
417 } else printk("\n");
418 }
419 }
420 host = pc->scsi_cmd->device->host;
421 spin_lock_irqsave(host->host_lock, flags);
422 pc->done(pc->scsi_cmd);
423 spin_unlock_irqrestore(host->host_lock, flags);
424 kfree(pc);
425 kfree(rq);
426 scsi->pc = NULL;
427 return 0;
428 }
429
430 static inline unsigned long get_timeout(idescsi_pc_t *pc)
431 {
432 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
433 }
434
435 static int idescsi_expiry(ide_drive_t *drive)
436 {
437 idescsi_scsi_t *scsi = drive->driver_data;
438 idescsi_pc_t *pc = scsi->pc;
439
440 #if IDESCSI_DEBUG_LOG
441 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
442 #endif
443 set_bit(PC_TIMEDOUT, &pc->flags);
444
445 return 0; /* we do not want the ide subsystem to retry */
446 }
447
448 /*
449 * Our interrupt handler.
450 */
451 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
452 {
453 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
454 idescsi_pc_t *pc=scsi->pc;
455 struct request *rq = pc->rq;
456 atapi_bcount_t bcount;
457 atapi_status_t status;
458 atapi_ireason_t ireason;
459 atapi_feature_t feature;
460
461 unsigned int temp;
462
463 #if IDESCSI_DEBUG_LOG
464 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
465 #endif /* IDESCSI_DEBUG_LOG */
466
467 if (test_bit(PC_TIMEDOUT, &pc->flags)){
468 #if IDESCSI_DEBUG_LOG
469 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
470 pc->scsi_cmd->serial_number, jiffies);
471 #endif
472 /* end this request now - scsi should retry it*/
473 idescsi_end_request (drive, 1, 0);
474 return ide_stopped;
475 }
476 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
477 #if IDESCSI_DEBUG_LOG
478 printk ("ide-scsi: %s: DMA complete\n", drive->name);
479 #endif /* IDESCSI_DEBUG_LOG */
480 pc->actually_transferred=pc->request_transfer;
481 (void) HWIF(drive)->ide_dma_end(drive);
482 }
483
484 feature.all = 0;
485 /* Clear the interrupt */
486 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
487
488 if (!status.b.drq) {
489 /* No more interrupts */
490 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
491 printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
492 local_irq_enable();
493 if (status.b.check)
494 rq->errors++;
495 idescsi_end_request (drive, 1, 0);
496 return ide_stopped;
497 }
498 bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG);
499 bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG);
500 ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
501
502 if (ireason.b.cod) {
503 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
504 return ide_do_reset (drive);
505 }
506 if (ireason.b.io) {
507 temp = pc->actually_transferred + bcount.all;
508 if (temp > pc->request_transfer) {
509 if (temp > pc->buffer_size) {
510 printk(KERN_ERR "ide-scsi: The scsi wants to "
511 "send us more data than expected "
512 "- discarding data\n");
513 temp = pc->buffer_size - pc->actually_transferred;
514 if (temp) {
515 clear_bit(PC_WRITING, &pc->flags);
516 if (pc->sg)
517 idescsi_input_buffers(drive, pc, temp);
518 else
519 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
520 printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
521 }
522 pc->actually_transferred += temp;
523 pc->current_position += temp;
524 idescsi_discard_data(drive, bcount.all - temp);
525 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
526 return ide_started;
527 }
528 #if IDESCSI_DEBUG_LOG
529 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
530 #endif /* IDESCSI_DEBUG_LOG */
531 }
532 }
533 if (ireason.b.io) {
534 clear_bit(PC_WRITING, &pc->flags);
535 if (pc->sg)
536 idescsi_input_buffers(drive, pc, bcount.all);
537 else
538 HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
539 } else {
540 set_bit(PC_WRITING, &pc->flags);
541 if (pc->sg)
542 idescsi_output_buffers (drive, pc, bcount.all);
543 else
544 HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
545 }
546 /* Update the current position */
547 pc->actually_transferred += bcount.all;
548 pc->current_position += bcount.all;
549
550 /* And set the interrupt handler again */
551 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
552 return ide_started;
553 }
554
555 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
556 {
557 ide_hwif_t *hwif = drive->hwif;
558 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
559 idescsi_pc_t *pc = scsi->pc;
560 atapi_ireason_t ireason;
561 ide_startstop_t startstop;
562
563 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
564 printk(KERN_ERR "ide-scsi: Strange, packet command "
565 "initiated yet DRQ isn't asserted\n");
566 return startstop;
567 }
568 ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
569 if (!ireason.b.cod || ireason.b.io) {
570 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
571 "issuing a packet command\n");
572 return ide_do_reset (drive);
573 }
574 if (HWGROUP(drive)->handler != NULL)
575 BUG();
576 /* Set the interrupt routine */
577 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
578 /* Send the actual packet */
579 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
580 if (test_bit (PC_DMA_OK, &pc->flags)) {
581 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
582 hwif->dma_start(drive);
583 }
584 return ide_started;
585 }
586
587 static inline int idescsi_set_direction(idescsi_pc_t *pc)
588 {
589 switch (pc->c[0]) {
590 case READ_6: case READ_10: case READ_12:
591 clear_bit(PC_WRITING, &pc->flags);
592 return 0;
593 case WRITE_6: case WRITE_10: case WRITE_12:
594 set_bit(PC_WRITING, &pc->flags);
595 return 0;
596 default:
597 return 1;
598 }
599 }
600
601 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
602 {
603 ide_hwif_t *hwif = drive->hwif;
604 struct scatterlist *sg, *scsi_sg;
605 int segments;
606
607 if (!pc->request_transfer || pc->request_transfer % 1024)
608 return 1;
609
610 if (idescsi_set_direction(pc))
611 return 1;
612
613 sg = hwif->sg_table;
614 scsi_sg = pc->scsi_cmd->request_buffer;
615 segments = pc->scsi_cmd->use_sg;
616
617 if (segments > hwif->sg_max_nents)
618 return 1;
619
620 if (!segments) {
621 hwif->sg_nents = 1;
622 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
623 } else {
624 hwif->sg_nents = segments;
625 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
626 }
627
628 return 0;
629 }
630
631 /*
632 * Issue a packet command
633 */
634 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
635 {
636 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
637 ide_hwif_t *hwif = drive->hwif;
638 atapi_feature_t feature;
639 atapi_bcount_t bcount;
640
641 scsi->pc=pc; /* Set the current packet command */
642 pc->actually_transferred=0; /* We haven't transferred any data yet */
643 pc->current_position=pc->buffer;
644 bcount.all = min(pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */
645
646 feature.all = 0;
647 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
648 hwif->sg_mapped = 1;
649 feature.b.dma = !hwif->dma_setup(drive);
650 hwif->sg_mapped = 0;
651 }
652
653 SELECT_DRIVE(drive);
654 if (IDE_CONTROL_REG)
655 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
656
657 HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
658 HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
659 HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
660
661 if (feature.b.dma)
662 set_bit(PC_DMA_OK, &pc->flags);
663
664 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
665 if (HWGROUP(drive)->handler != NULL)
666 BUG();
667 ide_set_handler(drive, &idescsi_transfer_pc,
668 get_timeout(pc), idescsi_expiry);
669 /* Issue the packet command */
670 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
671 return ide_started;
672 } else {
673 /* Issue the packet command */
674 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
675 return idescsi_transfer_pc(drive);
676 }
677 }
678
679 /*
680 * idescsi_do_request is our request handling function.
681 */
682 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
683 {
684 #if IDESCSI_DEBUG_LOG
685 printk (KERN_INFO "rq_status: %d, dev: %s, cmd: %x, errors: %d\n",rq->rq_status, rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
686 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
687 #endif /* IDESCSI_DEBUG_LOG */
688
689 if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
690 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
691 }
692 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
693 idescsi_end_request (drive, 0, 0);
694 return ide_stopped;
695 }
696
697 static void idescsi_add_settings(ide_drive_t *drive)
698 {
699 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
700
701 /*
702 * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function
703 */
704 ide_add_setting(drive, "bios_cyl", SETTING_RW, -1, -1, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
705 ide_add_setting(drive, "bios_head", SETTING_RW, -1, -1, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
706 ide_add_setting(drive, "bios_sect", SETTING_RW, -1, -1, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
707 ide_add_setting(drive, "transform", SETTING_RW, -1, -1, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
708 ide_add_setting(drive, "log", SETTING_RW, -1, -1, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
709 }
710
711 /*
712 * Driver initialization.
713 */
714 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
715 {
716 DRIVER(drive)->busy++;
717 if (drive->id && (drive->id->config & 0x0060) == 0x20)
718 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
719 set_bit(IDESCSI_TRANSFORM, &scsi->transform);
720 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
721 #if IDESCSI_DEBUG_LOG
722 set_bit(IDESCSI_LOG_CMD, &scsi->log);
723 #endif /* IDESCSI_DEBUG_LOG */
724 idescsi_add_settings(drive);
725 DRIVER(drive)->busy--;
726 }
727
728 static int idescsi_cleanup (ide_drive_t *drive)
729 {
730 struct Scsi_Host *scsihost = drive->driver_data;
731 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
732 struct gendisk *g = scsi->disk;
733
734 if (ide_unregister_subdriver(drive))
735 return 1;
736
737 ide_unregister_region(g);
738
739 drive->driver_data = NULL;
740 g->private_data = NULL;
741 put_disk(g);
742
743 scsi_remove_host(scsihost);
744 ide_scsi_put(scsi);
745
746 return 0;
747 }
748
749 static int idescsi_attach(ide_drive_t *drive);
750
751 #ifdef CONFIG_PROC_FS
752 static ide_proc_entry_t idescsi_proc[] = {
753 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
754 { NULL, 0, NULL, NULL }
755 };
756 #else
757 # define idescsi_proc NULL
758 #endif
759
760 /*
761 * IDE subdriver functions, registered with ide.c
762 */
763 static ide_driver_t idescsi_driver = {
764 .owner = THIS_MODULE,
765 .name = "ide-scsi",
766 .version = IDESCSI_VERSION,
767 .media = ide_scsi,
768 .busy = 0,
769 .supports_dsc_overlap = 0,
770 .proc = idescsi_proc,
771 .attach = idescsi_attach,
772 .cleanup = idescsi_cleanup,
773 .do_request = idescsi_do_request,
774 .end_request = idescsi_end_request,
775 .error = idescsi_atapi_error,
776 .abort = idescsi_atapi_abort,
777 .drives = LIST_HEAD_INIT(idescsi_driver.drives),
778 };
779
780 static int idescsi_ide_open(struct inode *inode, struct file *filp)
781 {
782 struct gendisk *disk = inode->i_bdev->bd_disk;
783 struct ide_scsi_obj *scsi;
784 ide_drive_t *drive;
785
786 if (!(scsi = ide_scsi_get(disk)))
787 return -ENXIO;
788
789 drive = scsi->drive;
790
791 drive->usage++;
792
793 return 0;
794 }
795
796 static int idescsi_ide_release(struct inode *inode, struct file *filp)
797 {
798 struct gendisk *disk = inode->i_bdev->bd_disk;
799 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
800 ide_drive_t *drive = scsi->drive;
801
802 drive->usage--;
803
804 ide_scsi_put(scsi);
805
806 return 0;
807 }
808
809 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
810 unsigned int cmd, unsigned long arg)
811 {
812 struct block_device *bdev = inode->i_bdev;
813 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
814 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
815 }
816
817 static struct block_device_operations idescsi_ops = {
818 .owner = THIS_MODULE,
819 .open = idescsi_ide_open,
820 .release = idescsi_ide_release,
821 .ioctl = idescsi_ide_ioctl,
822 };
823
824 static int idescsi_attach(ide_drive_t *drive);
825
826 static int idescsi_slave_configure(struct scsi_device * sdp)
827 {
828 /* Configure detected device */
829 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
830 return 0;
831 }
832
833 static const char *idescsi_info (struct Scsi_Host *host)
834 {
835 return "SCSI host adapter emulation for IDE ATAPI devices";
836 }
837
838 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
839 {
840 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
841
842 if (cmd == SG_SET_TRANSFORM) {
843 if (arg)
844 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
845 else
846 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
847 return 0;
848 } else if (cmd == SG_GET_TRANSFORM)
849 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
850 return -EINVAL;
851 }
852
853 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
854 {
855 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
856
857 /* this was a layering violation and we can't support it
858 anymore, sorry. */
859 #if 0
860 struct gendisk *disk = cmd->request->rq_disk;
861
862 if (disk) {
863 struct Scsi_Device_Template **p = disk->private_data;
864 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
865 return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
866 }
867 #endif
868 return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
869 }
870
871 static int idescsi_queue (struct scsi_cmnd *cmd,
872 void (*done)(struct scsi_cmnd *))
873 {
874 struct Scsi_Host *host = cmd->device->host;
875 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
876 ide_drive_t *drive = scsi->drive;
877 struct request *rq = NULL;
878 idescsi_pc_t *pc = NULL;
879
880 if (!drive) {
881 printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->device->id);
882 goto abort;
883 }
884 scsi = drive_to_idescsi(drive);
885 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
886 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
887 if (rq == NULL || pc == NULL) {
888 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
889 goto abort;
890 }
891
892 memset (pc->c, 0, 12);
893 pc->flags = 0;
894 pc->rq = rq;
895 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
896 if (cmd->use_sg) {
897 pc->buffer = NULL;
898 pc->sg = cmd->request_buffer;
899 } else {
900 pc->buffer = cmd->request_buffer;
901 pc->sg = NULL;
902 }
903 pc->b_count = 0;
904 pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
905 pc->scsi_cmd = cmd;
906 pc->done = done;
907 pc->timeout = jiffies + cmd->timeout_per_command;
908
909 if (should_transform(drive, cmd))
910 set_bit(PC_TRANSFORM, &pc->flags);
911 idescsi_transform_pc1 (drive, pc);
912
913 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
914 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
915 hexdump(cmd->cmnd, cmd->cmd_len);
916 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
917 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
918 hexdump(pc->c, 12);
919 }
920 }
921
922 ide_init_drive_cmd (rq);
923 rq->special = (char *) pc;
924 rq->flags = REQ_SPECIAL;
925 spin_unlock_irq(host->host_lock);
926 rq->rq_disk = scsi->disk;
927 (void) ide_do_drive_cmd (drive, rq, ide_end);
928 spin_lock_irq(host->host_lock);
929 return 0;
930 abort:
931 if (pc) kfree (pc);
932 if (rq) kfree (rq);
933 cmd->result = DID_ERROR << 16;
934 done(cmd);
935 return 0;
936 }
937
938 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
939 {
940 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
941 ide_drive_t *drive = scsi->drive;
942 int busy;
943 int ret = FAILED;
944
945 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
946
947 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
948 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
949
950 if (!drive) {
951 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
952 WARN_ON(1);
953 goto no_drive;
954 }
955
956 /* First give it some more time, how much is "right" is hard to say :-( */
957
958 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
959 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
960 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
961
962 spin_lock_irq(&ide_lock);
963
964 /* If there is no pc running we're done (our interrupt took care of it) */
965 if (!scsi->pc) {
966 ret = SUCCESS;
967 goto ide_unlock;
968 }
969
970 /* It's somewhere in flight. Does ide subsystem agree? */
971 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
972 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
973 /*
974 * FIXME - not sure this condition can ever occur
975 */
976 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
977
978 if (scsi->pc->rq->flags & REQ_SENSE)
979 kfree(scsi->pc->buffer);
980 kfree(scsi->pc->rq);
981 kfree(scsi->pc);
982 scsi->pc = NULL;
983
984 ret = SUCCESS;
985 }
986
987 ide_unlock:
988 spin_unlock_irq(&ide_lock);
989 no_drive:
990 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
991 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
992
993 return ret;
994 }
995
996 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
997 {
998 struct request *req;
999 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
1000 ide_drive_t *drive = scsi->drive;
1001 int ready = 0;
1002 int ret = SUCCESS;
1003
1004 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1005
1006 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1007 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1008
1009 if (!drive) {
1010 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1011 WARN_ON(1);
1012 return FAILED;
1013 }
1014
1015 spin_lock_irq(&ide_lock);
1016
1017 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1018 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1019 spin_unlock(&ide_lock);
1020 return FAILED;
1021 }
1022
1023 /* kill current request */
1024 blkdev_dequeue_request(req);
1025 end_that_request_last(req);
1026 if (req->flags & REQ_SENSE)
1027 kfree(scsi->pc->buffer);
1028 kfree(scsi->pc);
1029 scsi->pc = NULL;
1030 kfree(req);
1031
1032 /* now nuke the drive queue */
1033 while ((req = elv_next_request(drive->queue))) {
1034 blkdev_dequeue_request(req);
1035 end_that_request_last(req);
1036 }
1037
1038 HWGROUP(drive)->rq = NULL;
1039 HWGROUP(drive)->handler = NULL;
1040 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
1041 spin_unlock_irq(&ide_lock);
1042
1043 ide_do_reset(drive);
1044
1045 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1046
1047 do {
1048 set_current_state(TASK_UNINTERRUPTIBLE);
1049 spin_unlock_irq(cmd->device->host->host_lock);
1050 schedule_timeout(HZ/20);
1051 spin_lock_irq(cmd->device->host->host_lock);
1052 } while ( HWGROUP(drive)->handler );
1053
1054 ready = drive_is_ready(drive);
1055 HWGROUP(drive)->busy--;
1056 if (!ready) {
1057 printk (KERN_ERR "ide-scsi: reset failed!\n");
1058 ret = FAILED;
1059 }
1060
1061 return ret;
1062 }
1063
1064 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1065 sector_t capacity, int *parm)
1066 {
1067 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1068 ide_drive_t *drive = idescsi->drive;
1069
1070 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1071 parm[0] = drive->bios_head;
1072 parm[1] = drive->bios_sect;
1073 parm[2] = drive->bios_cyl;
1074 }
1075 return 0;
1076 }
1077
1078 static struct scsi_host_template idescsi_template = {
1079 .module = THIS_MODULE,
1080 .name = "idescsi",
1081 .info = idescsi_info,
1082 .slave_configure = idescsi_slave_configure,
1083 .ioctl = idescsi_ioctl,
1084 .queuecommand = idescsi_queue,
1085 .eh_abort_handler = idescsi_eh_abort,
1086 .eh_host_reset_handler = idescsi_eh_reset,
1087 .bios_param = idescsi_bios,
1088 .can_queue = 40,
1089 .this_id = -1,
1090 .sg_tablesize = 256,
1091 .cmd_per_lun = 5,
1092 .max_sectors = 128,
1093 .use_clustering = DISABLE_CLUSTERING,
1094 .emulated = 1,
1095 .proc_name = "ide-scsi",
1096 };
1097
1098 static int idescsi_attach(ide_drive_t *drive)
1099 {
1100 idescsi_scsi_t *idescsi;
1101 struct Scsi_Host *host;
1102 struct gendisk *g;
1103 static int warned;
1104 int err = -ENOMEM;
1105
1106 if (!warned && drive->media == ide_cdrom) {
1107 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1108 warned = 1;
1109 }
1110
1111 if (!strstr("ide-scsi", drive->driver_req) ||
1112 !drive->present ||
1113 drive->media == ide_disk ||
1114 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1115 return 1;
1116
1117 g = alloc_disk(1 << PARTN_BITS);
1118 if (!g)
1119 goto out_host_put;
1120
1121 ide_init_disk(g, drive);
1122
1123 host->max_id = 1;
1124
1125 #if IDESCSI_DEBUG_LOG
1126 if (drive->id->last_lun)
1127 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1128 #endif
1129 if ((drive->id->last_lun & 0x7) != 7)
1130 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1131 else
1132 host->max_lun = 1;
1133
1134 drive->driver_data = host;
1135 idescsi = scsihost_to_idescsi(host);
1136 idescsi->drive = drive;
1137 idescsi->driver = &idescsi_driver;
1138 idescsi->host = host;
1139 idescsi->disk = g;
1140 g->private_data = &idescsi->driver;
1141 err = ide_register_subdriver(drive, &idescsi_driver);
1142 if (!err) {
1143 idescsi_setup (drive, idescsi);
1144 g->fops = &idescsi_ops;
1145 ide_register_region(g);
1146 err = scsi_add_host(host, &drive->gendev);
1147 if (!err) {
1148 scsi_scan_host(host);
1149 return 0;
1150 }
1151 /* fall through on error */
1152 ide_unregister_region(g);
1153 ide_unregister_subdriver(drive);
1154 }
1155
1156 put_disk(g);
1157 out_host_put:
1158 scsi_host_put(host);
1159 return err;
1160 }
1161
1162 static int __init init_idescsi_module(void)
1163 {
1164 return ide_register_driver(&idescsi_driver);
1165 }
1166
1167 static void __exit exit_idescsi_module(void)
1168 {
1169 ide_unregister_driver(&idescsi_driver);
1170 }
1171
1172 module_init(init_idescsi_module);
1173 module_exit(exit_idescsi_module);
1174 MODULE_LICENSE("GPL");
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