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ide: remove IDE_*_REG macros
[deliverable/linux.git] / drivers / scsi / ide-scsi.c
CommitLineData
1da177e4 1/*
59bca8cc
BZ		 2 * Copyright (C) 1996-1999 Gadi Oxman <gadio@netvision.net.il>
3 * Copyright (C) 2004-2005 Bartlomiej Zolnierkiewicz
1da177e4
LT		 4 */
5
6/*
7 * Emulation of a SCSI host adapter for IDE ATAPI devices.
8 *
9 * With this driver, one can use the Linux SCSI drivers instead of the
10 * native IDE ATAPI drivers.
11 *
12 * Ver 0.1 Dec 3 96 Initial version.
13 * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
14 * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
15 * to Janos Farkas for pointing this out.
16 * Avoid using bitfields in structures for m68k.
17 * Added Scatter/Gather and DMA support.
18 * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
19 * Use variable timeout for each command.
20 * Ver 0.5 Jan 2 98 Fix previous PD/CD support.
21 * Allow disabling of SCSI-6 to SCSI-10 transformation.
22 * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
23 * for access through /dev/sg.
24 * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
25 * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
26 * detection of devices with CONFIG_SCSI_MULTI_LUN
27 * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
28 * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
29 * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
30 * Ver 0.92 Dec 31 02 Implement new SCSI mid level API
31 */
32
33#define IDESCSI_VERSION "0.92"
34
35#include <linux/module.h>
1da177e4
LT		 36#include <linux/types.h>
37#include <linux/string.h>
38#include <linux/kernel.h>
39#include <linux/mm.h>
40#include <linux/ioport.h>
41#include <linux/blkdev.h>
42#include <linux/errno.h>
43#include <linux/hdreg.h>
44#include <linux/slab.h>
45#include <linux/ide.h>
46#include <linux/scatterlist.h>
df0ae249 47#include <linux/delay.h>
e723ccd8 48#include <linux/mutex.h>
1977f032 49#include <linux/bitops.h>
1da177e4
LT		 50
51#include <asm/io.h>
1da177e4
LT		 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
63typedef 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 */
c79d88b7 72 unsigned int sg_cnt; /* Number of entries in sg */
1da177e4
LT		 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 */
1da177e4
LT		 85#define PC_TIMEDOUT 3 /* command timed out */
86#define PC_DMA_OK 4 /* Use DMA */
87
88/*
89 * SCSI command transformation layer
90 */
1da177e4
LT		 91#define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
92
93/*
94 * Log flags
95 */
96#define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
97
98typedef struct ide_scsi_obj {
99 ide_drive_t *drive;
100 ide_driver_t *driver;
101 struct gendisk *disk;
102 struct Scsi_Host *host;
103
104 idescsi_pc_t *pc; /* Current packet command */
105 unsigned long flags; /* Status/Action flags */
106 unsigned long transform; /* SCSI cmd translation layer */
107 unsigned long log; /* log flags */
108} idescsi_scsi_t;
109
e723ccd8 110static DEFINE_MUTEX(idescsi_ref_mutex);
aaeab80b 111static int idescsi_nocd; /* Set by module param to skip cd */
1da177e4
LT		 112
113#define ide_scsi_g(disk) \
114 container_of((disk)->private_data, struct ide_scsi_obj, driver)
115
116static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
117{
118 struct ide_scsi_obj *scsi = NULL;
119
e723ccd8 120 mutex_lock(&idescsi_ref_mutex);
1da177e4
LT		 121 scsi = ide_scsi_g(disk);
122 if (scsi)
123 scsi_host_get(scsi->host);
e723ccd8 124 mutex_unlock(&idescsi_ref_mutex);
1da177e4
LT		 125 return scsi;
126}
127
128static void ide_scsi_put(struct ide_scsi_obj *scsi)
129{
e723ccd8 130 mutex_lock(&idescsi_ref_mutex);
1da177e4 131 scsi_host_put(scsi->host);
e723ccd8 132 mutex_unlock(&idescsi_ref_mutex);
1da177e4
LT		 133}
134
135static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
136{
137 return (idescsi_scsi_t*) (&host[1]);
138}
139
140static 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
1da177e4
LT		 155/*
156 * PIO data transfer routines using the scatter gather table.
157 */
158static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
159{
160 int count;
161 char *buf;
162
163 while (bcount) {
1da177e4 164 count = min(pc->sg->length - pc->b_count, bcount);
45711f1a 165 if (PageHighMem(sg_page(pc->sg))) {
a717f773
AM		 166 unsigned long flags;
167
168 local_irq_save(flags);
45711f1a 169 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
a717f773
AM		 170 pc->sg->offset;
171 drive->hwif->atapi_input_bytes(drive,
172 buf + pc->b_count, count);
173 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
174 local_irq_restore(flags);
175 } else {
45711f1a 176 buf = sg_virt(pc->sg);
a717f773
AM		 177 drive->hwif->atapi_input_bytes(drive,
178 buf + pc->b_count, count);
179 }
180 bcount -= count; pc->b_count += count;
1da177e4 181 if (pc->b_count == pc->sg->length) {
c79d88b7 182 if (!--pc->sg_cnt)
d274a987
JA		 183 break;
184 pc->sg = sg_next(pc->sg);
1da177e4
LT		 185 pc->b_count = 0;
186 }
187 }
d274a987
JA		 188
189 if (bcount) {
190 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
7616c0ad 191 ide_atapi_discard_data(drive, bcount);
d274a987 192 }
1da177e4
LT		 193}
194
195static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
196{
197 int count;
198 char *buf;
199
200 while (bcount) {
1da177e4 201 count = min(pc->sg->length - pc->b_count, bcount);
45711f1a 202 if (PageHighMem(sg_page(pc->sg))) {
a717f773
AM		 203 unsigned long flags;
204
205 local_irq_save(flags);
45711f1a 206 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
a717f773
AM		 207 pc->sg->offset;
208 drive->hwif->atapi_output_bytes(drive,
209 buf + pc->b_count, count);
210 kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
211 local_irq_restore(flags);
212 } else {
45711f1a 213 buf = sg_virt(pc->sg);
a717f773
AM		 214 drive->hwif->atapi_output_bytes(drive,
215 buf + pc->b_count, count);
216 }
217 bcount -= count; pc->b_count += count;
1da177e4 218 if (pc->b_count == pc->sg->length) {
c79d88b7 219 if (!--pc->sg_cnt)
d274a987
JA		 220 break;
221 pc->sg = sg_next(pc->sg);
1da177e4
LT		 222 pc->b_count = 0;
223 }
224 }
d274a987
JA		 225
226 if (bcount) {
227 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
7616c0ad 228 ide_atapi_write_zeros(drive, bcount);
d274a987 229 }
1da177e4
LT		 230}
231
69ae6fee
BZ		 232static void ide_scsi_hex_dump(u8 *data, int len)
233{
234 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
235}
236
1da177e4
LT		 237static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
238{
239 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
240 idescsi_pc_t *pc;
241 struct request *rq;
242 u8 *buf;
243
244 /* stuff a sense request in front of our current request */
41ead3c9
MK		 245 pc = kzalloc(sizeof(idescsi_pc_t), GFP_ATOMIC);
246 rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
247 buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
248 if (!pc || !rq || !buf) {
c9475cb0
JJ		 249 kfree(buf);
250 kfree(rq);
251 kfree(pc);
1da177e4
LT		 252 return -ENOMEM;
253 }
1da177e4
LT		 254 ide_init_drive_cmd(rq);
255 rq->special = (char *) pc;
256 pc->rq = rq;
257 pc->buffer = buf;
258 pc->c[0] = REQUEST_SENSE;
259 pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
4aff5e23 260 rq->cmd_type = REQ_TYPE_SENSE;
1da177e4
LT		 261 pc->timeout = jiffies + WAIT_READY;
262 /* NOTE! Save the failed packet command in "rq->buffer" */
263 rq->buffer = (void *) failed_command->special;
264 pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
265 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
266 printk ("ide-scsi: %s: queue cmd = ", drive->name);
69ae6fee 267 ide_scsi_hex_dump(pc->c, 6);
1da177e4
LT		 268 }
269 rq->rq_disk = scsi->disk;
270 return ide_do_drive_cmd(drive, rq, ide_preempt);
271}
272
273static int idescsi_end_request(ide_drive_t *, int, int);
274
275static ide_startstop_t
276idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
277{
23579a2a
BZ		 278 ide_hwif_t *hwif = drive->hwif;
279
c47137a9 280 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
1da177e4 281 /* force an abort */
23579a2a
BZ		 282 hwif->OUTB(WIN_IDLEIMMEDIATE,
283 hwif->io_ports[IDE_COMMAND_OFFSET]);
1da177e4
LT		 284
285 rq->errors++;
286
287 idescsi_end_request(drive, 0, 0);
288
289 return ide_stopped;
290}
291
292static ide_startstop_t
293idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
294{
295#if IDESCSI_DEBUG_LOG
296 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
297 ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
298#endif
299 rq->errors |= ERROR_MAX;
300
301 idescsi_end_request(drive, 0, 0);
302
303 return ide_stopped;
304}
305
306static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
307{
308 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
309 struct request *rq = HWGROUP(drive)->rq;
310 idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
311 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
312 struct Scsi_Host *host;
32565347 313 int errors = rq->errors;
1da177e4
LT		 314 unsigned long flags;
315
4aff5e23 316 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
1da177e4
LT		 317 ide_end_request(drive, uptodate, nrsecs);
318 return 0;
319 }
320 ide_end_drive_cmd (drive, 0, 0);
4aff5e23 321 if (blk_sense_request(rq)) {
1da177e4
LT		 322 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
323 if (log) {
324 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
69ae6fee 325 ide_scsi_hex_dump(pc->buffer, 16);
1da177e4
LT		 326 }
327 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
328 kfree(pc->buffer);
329 kfree(pc);
330 kfree(rq);
331 pc = opc;
332 rq = pc->rq;
333 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
334 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
335 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
336 if (log)
337 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
338 drive->name, pc->scsi_cmd->serial_number);
339 pc->scsi_cmd->result = DID_TIME_OUT << 16;
32565347 340 } else if (errors >= ERROR_MAX) {
1da177e4
LT		 341 pc->scsi_cmd->result = DID_ERROR << 16;
342 if (log)
343 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
32565347 344 } else if (errors) {
1da177e4
LT		 345 if (log)
346 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
347 if (!idescsi_check_condition(drive, rq))
348 /* we started a request sense, so we'll be back, exit for now */
349 return 0;
350 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
351 } else {
352 pc->scsi_cmd->result = DID_OK << 16;
1da177e4
LT		 353 }
354 host = pc->scsi_cmd->device->host;
355 spin_lock_irqsave(host->host_lock, flags);
356 pc->done(pc->scsi_cmd);
357 spin_unlock_irqrestore(host->host_lock, flags);
358 kfree(pc);
359 kfree(rq);
360 scsi->pc = NULL;
361 return 0;
362}
363
364static inline unsigned long get_timeout(idescsi_pc_t *pc)
365{
366 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
367}
368
369static int idescsi_expiry(ide_drive_t *drive)
370{
d1be0a82 371 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
1da177e4
LT		 372 idescsi_pc_t *pc = scsi->pc;
373
374#if IDESCSI_DEBUG_LOG
375 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
376#endif
377 set_bit(PC_TIMEDOUT, &pc->flags);
378
379 return 0; /* we do not want the ide subsystem to retry */
380}
381
382/*
383 * Our interrupt handler.
384 */
385static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
386{
387 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
790d1239
BZ		 388 ide_hwif_t *hwif = drive->hwif;
389 idescsi_pc_t *pc = scsi->pc;
1da177e4 390 struct request *rq = pc->rq;
1da177e4 391 unsigned int temp;
790d1239 392 u16 bcount;
8e7657ae 393 u8 stat, ireason;
1da177e4
LT		 394
395#if IDESCSI_DEBUG_LOG
396 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
397#endif /* IDESCSI_DEBUG_LOG */
398
399 if (test_bit(PC_TIMEDOUT, &pc->flags)){
400#if IDESCSI_DEBUG_LOG
401 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
402 pc->scsi_cmd->serial_number, jiffies);
403#endif
404 /* end this request now - scsi should retry it*/
405 idescsi_end_request (drive, 1, 0);
406 return ide_stopped;
407 }
408 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
409#if IDESCSI_DEBUG_LOG
410 printk ("ide-scsi: %s: DMA complete\n", drive->name);
411#endif /* IDESCSI_DEBUG_LOG */
412 pc->actually_transferred=pc->request_transfer;
413 (void) HWIF(drive)->ide_dma_end(drive);
414 }
415
1da177e4 416 /* Clear the interrupt */
c47137a9 417 stat = ide_read_status(drive);
1da177e4 418
22c525b9 419 if ((stat & DRQ_STAT) == 0) {
1da177e4
LT		 420 /* No more interrupts */
421 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
422 printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
36e8e578 423 local_irq_enable_in_hardirq();
22c525b9 424 if (stat & ERR_STAT)
1da177e4
LT		 425 rq->errors++;
426 idescsi_end_request (drive, 1, 0);
427 return ide_stopped;
428 }
23579a2a
BZ		 429 bcount = (hwif->INB(hwif->io_ports[IDE_BCOUNTH_OFFSET]) << 8) |
430 hwif->INB(hwif->io_ports[IDE_BCOUNTL_OFFSET]);
431 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
1da177e4 432
8e7657ae 433 if (ireason & CD) {
1da177e4
LT		 434 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
435 return ide_do_reset (drive);
436 }
8e7657ae 437 if (ireason & IO) {
790d1239 438 temp = pc->actually_transferred + bcount;
1da177e4
LT		 439 if (temp > pc->request_transfer) {
440 if (temp > pc->buffer_size) {
441 printk(KERN_ERR "ide-scsi: The scsi wants to "
442 "send us more data than expected "
443 "- discarding data\n");
444 temp = pc->buffer_size - pc->actually_transferred;
445 if (temp) {
446 clear_bit(PC_WRITING, &pc->flags);
447 if (pc->sg)
448 idescsi_input_buffers(drive, pc, temp);
449 else
450 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
790d1239
BZ		 451 printk(KERN_ERR "ide-scsi: transferred"
452 " %d of %d bytes\n",
453 temp, bcount);
1da177e4
LT		 454 }
455 pc->actually_transferred += temp;
456 pc->current_position += temp;
7616c0ad 457 ide_atapi_discard_data(drive, bcount - temp);
1da177e4
LT		 458 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
459 return ide_started;
460 }
461#if IDESCSI_DEBUG_LOG
462 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
463#endif /* IDESCSI_DEBUG_LOG */
464 }
465 }
8e7657ae 466 if (ireason & IO) {
1da177e4
LT		 467 clear_bit(PC_WRITING, &pc->flags);
468 if (pc->sg)
790d1239 469 idescsi_input_buffers(drive, pc, bcount);
1da177e4 470 else
790d1239
BZ		 471 hwif->atapi_input_bytes(drive, pc->current_position,
472 bcount);
1da177e4
LT		 473 } else {
474 set_bit(PC_WRITING, &pc->flags);
475 if (pc->sg)
790d1239 476 idescsi_output_buffers(drive, pc, bcount);
1da177e4 477 else
790d1239
BZ		 478 hwif->atapi_output_bytes(drive, pc->current_position,
479 bcount);
1da177e4
LT		 480 }
481 /* Update the current position */
790d1239
BZ		 482 pc->actually_transferred += bcount;
483 pc->current_position += bcount;
1da177e4
LT		 484
485 /* And set the interrupt handler again */
486 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
487 return ide_started;
488}
489
490static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
491{
492 ide_hwif_t *hwif = drive->hwif;
493 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
494 idescsi_pc_t *pc = scsi->pc;
1da177e4 495 ide_startstop_t startstop;
8e7657ae 496 u8 ireason;
1da177e4
LT		 497
498 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
499 printk(KERN_ERR "ide-scsi: Strange, packet command "
500 "initiated yet DRQ isn't asserted\n");
501 return startstop;
502 }
23579a2a 503 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
8e7657ae 504 if ((ireason & CD) == 0 || (ireason & IO)) {
1da177e4
LT		 505 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
506 "issuing a packet command\n");
507 return ide_do_reset (drive);
508 }
125e1874 509 BUG_ON(HWGROUP(drive)->handler != NULL);
1da177e4
LT		 510 /* Set the interrupt routine */
511 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
512 /* Send the actual packet */
513 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
514 if (test_bit (PC_DMA_OK, &pc->flags)) {
515 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
516 hwif->dma_start(drive);
517 }
518 return ide_started;
519}
520
521static inline int idescsi_set_direction(idescsi_pc_t *pc)
522{
523 switch (pc->c[0]) {
524 case READ_6: case READ_10: case READ_12:
525 clear_bit(PC_WRITING, &pc->flags);
526 return 0;
527 case WRITE_6: case WRITE_10: case WRITE_12:
528 set_bit(PC_WRITING, &pc->flags);
529 return 0;
530 default:
531 return 1;
532 }
533}
534
535static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
536{
537 ide_hwif_t *hwif = drive->hwif;
538 struct scatterlist *sg, *scsi_sg;
539 int segments;
540
541 if (!pc->request_transfer || pc->request_transfer % 1024)
542 return 1;
543
544 if (idescsi_set_direction(pc))
545 return 1;
546
547 sg = hwif->sg_table;
427d0bd4
BH		 548 scsi_sg = scsi_sglist(pc->scsi_cmd);
549 segments = scsi_sg_count(pc->scsi_cmd);
1da177e4
LT		 550
551 if (segments > hwif->sg_max_nents)
552 return 1;
553
427d0bd4
BH		 554 hwif->sg_nents = segments;
555 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
1da177e4
LT		 556
557 return 0;
558}
559
560/*
561 * Issue a packet command
562 */
563static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
564{
565 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
566 ide_hwif_t *hwif = drive->hwif;
790d1239 567 u16 bcount;
e5f9f5a8 568 u8 dma = 0;
1da177e4
LT		 569
570 scsi->pc=pc; /* Set the current packet command */
571 pc->actually_transferred=0; /* We haven't transferred any data yet */
572 pc->current_position=pc->buffer;
790d1239
BZ		 573 /* Request to transfer the entire buffer at once */
574 bcount = min(pc->request_transfer, 63 * 1024);
1da177e4 575
1da177e4
LT		 576 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
577 hwif->sg_mapped = 1;
e5f9f5a8 578 dma = !hwif->dma_setup(drive);
1da177e4
LT		 579 hwif->sg_mapped = 0;
580 }
581
2fc57388 582 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
1da177e4 583
e5f9f5a8 584 if (dma)
1da177e4
LT		 585 set_bit(PC_DMA_OK, &pc->flags);
586
587 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
2d6027f0
BZ		 588 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
589 get_timeout(pc), idescsi_expiry);
1da177e4
LT		 590 return ide_started;
591 } else {
592 /* Issue the packet command */
23579a2a 593 hwif->OUTB(WIN_PACKETCMD, hwif->io_ports[IDE_COMMAND_OFFSET]);
1da177e4
LT		 594 return idescsi_transfer_pc(drive);
595 }
596}
597
598/*
599 * idescsi_do_request is our request handling function.
600 */
601static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
602{
603#if IDESCSI_DEBUG_LOG
cdd60262 604 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
1da177e4
LT		 605 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
606#endif /* IDESCSI_DEBUG_LOG */
607
4aff5e23 608 if (blk_sense_request(rq) || blk_special_request(rq)) {
1da177e4
LT		 609 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
610 }
611 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
612 idescsi_end_request (drive, 0, 0);
613 return ide_stopped;
614}
615
7662d046 616#ifdef CONFIG_IDE_PROC_FS
1da177e4
LT		 617static void idescsi_add_settings(ide_drive_t *drive)
618{
619 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
620
621/*
1497943e 622 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
1da177e4 623 */
1497943e
BZ		 624 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
625 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
626 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
627 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
628 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
1da177e4 629}
7662d046
BZ		 630#else
631static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
632#endif
1da177e4
LT		 633
634/*
635 * Driver initialization.
636 */
637static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
638{
1da177e4
LT		 639 if (drive->id && (drive->id->config & 0x0060) == 0x20)
640 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
1da177e4
LT		 641 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
642#if IDESCSI_DEBUG_LOG
643 set_bit(IDESCSI_LOG_CMD, &scsi->log);
644#endif /* IDESCSI_DEBUG_LOG */
645 idescsi_add_settings(drive);
1da177e4
LT		 646}
647
b62735d9 648static void ide_scsi_remove(ide_drive_t *drive)
1da177e4
LT		 649{
650 struct Scsi_Host *scsihost = drive->driver_data;
651 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
652 struct gendisk *g = scsi->disk;
653
6fdea8db 654 scsi_remove_host(scsihost);
7662d046 655 ide_proc_unregister_driver(drive, scsi->driver);
1da177e4
LT		 656
657 ide_unregister_region(g);
658
659 drive->driver_data = NULL;
660 g->private_data = NULL;
661 put_disk(g);
662
1da177e4 663 ide_scsi_put(scsi);
1da177e4
LT		 664}
665
b62735d9 666static int ide_scsi_probe(ide_drive_t *);
1da177e4 667
ecfd80e4 668#ifdef CONFIG_IDE_PROC_FS
1da177e4
LT		 669static ide_proc_entry_t idescsi_proc[] = {
670 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
671 { NULL, 0, NULL, NULL }
672};
1da177e4
LT		 673#endif
674
1da177e4 675static ide_driver_t idescsi_driver = {
8604affd 676 .gen_driver = {
4ef3b8f4 677 .owner = THIS_MODULE,
8604affd
BZ		 678 .name = "ide-scsi",
679 .bus = &ide_bus_type,
8604affd 680 },
b62735d9
MP		 681 .probe = ide_scsi_probe,
682 .remove = ide_scsi_remove,
1da177e4
LT		 683 .version = IDESCSI_VERSION,
684 .media = ide_scsi,
1da177e4 685 .supports_dsc_overlap = 0,
1da177e4
LT		 686 .do_request = idescsi_do_request,
687 .end_request = idescsi_end_request,
688 .error = idescsi_atapi_error,
689 .abort = idescsi_atapi_abort,
7662d046
BZ		 690#ifdef CONFIG_IDE_PROC_FS
691 .proc = idescsi_proc,
692#endif
1da177e4
LT		 693};
694
695static int idescsi_ide_open(struct inode *inode, struct file *filp)
696{
697 struct gendisk *disk = inode->i_bdev->bd_disk;
698 struct ide_scsi_obj *scsi;
1da177e4
LT		 699
700 if (!(scsi = ide_scsi_get(disk)))
701 return -ENXIO;
702
1da177e4
LT		 703 return 0;
704}
705
706static int idescsi_ide_release(struct inode *inode, struct file *filp)
707{
708 struct gendisk *disk = inode->i_bdev->bd_disk;
709 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
1da177e4
LT		 710
711 ide_scsi_put(scsi);
712
713 return 0;
714}
715
716static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
717 unsigned int cmd, unsigned long arg)
718{
719 struct block_device *bdev = inode->i_bdev;
720 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
721 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
722}
723
724static struct block_device_operations idescsi_ops = {
725 .owner = THIS_MODULE,
726 .open = idescsi_ide_open,
727 .release = idescsi_ide_release,
728 .ioctl = idescsi_ide_ioctl,
729};
730
1da177e4
LT		 731static int idescsi_slave_configure(struct scsi_device * sdp)
732{
733 /* Configure detected device */
427d0bd4
BH		 734 sdp->use_10_for_rw = 1;
735 sdp->use_10_for_ms = 1;
1da177e4
LT		 736 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
737 return 0;
738}
739
740static const char *idescsi_info (struct Scsi_Host *host)
741{
742 return "SCSI host adapter emulation for IDE ATAPI devices";
743}
744
745static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
746{
747 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
748
749 if (cmd == SG_SET_TRANSFORM) {
750 if (arg)
751 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
752 else
753 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
754 return 0;
755 } else if (cmd == SG_GET_TRANSFORM)
756 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
757 return -EINVAL;
758}
759
1da177e4
LT		 760static int idescsi_queue (struct scsi_cmnd *cmd,
761 void (*done)(struct scsi_cmnd *))
762{
763 struct Scsi_Host *host = cmd->device->host;
764 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
765 ide_drive_t *drive = scsi->drive;
766 struct request *rq = NULL;
767 idescsi_pc_t *pc = NULL;
768
769 if (!drive) {
017560fc 770 scmd_printk (KERN_ERR, cmd, "drive not present\n");
1da177e4
LT		 771 goto abort;
772 }
773 scsi = drive_to_idescsi(drive);
774 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
775 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
776 if (rq == NULL || pc == NULL) {
777 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
778 goto abort;
779 }
780
781 memset (pc->c, 0, 12);
782 pc->flags = 0;
783 pc->rq = rq;
784 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
427d0bd4
BH		 785 pc->buffer = NULL;
786 pc->sg = scsi_sglist(cmd);
c79d88b7 787 pc->sg_cnt = scsi_sg_count(cmd);
1da177e4 788 pc->b_count = 0;
427d0bd4 789 pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
1da177e4
LT		 790 pc->scsi_cmd = cmd;
791 pc->done = done;
792 pc->timeout = jiffies + cmd->timeout_per_command;
793
1da177e4
LT		 794 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
795 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
69ae6fee 796 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
1da177e4
LT		 797 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
798 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
69ae6fee 799 ide_scsi_hex_dump(pc->c, 12);
1da177e4
LT		 800 }
801 }
802
803 ide_init_drive_cmd (rq);
804 rq->special = (char *) pc;
4aff5e23 805 rq->cmd_type = REQ_TYPE_SPECIAL;
1da177e4
LT		 806 spin_unlock_irq(host->host_lock);
807 rq->rq_disk = scsi->disk;
808 (void) ide_do_drive_cmd (drive, rq, ide_end);
809 spin_lock_irq(host->host_lock);
810 return 0;
811abort:
c9475cb0
JJ		 812 kfree (pc);
813 kfree (rq);
1da177e4
LT		 814 cmd->result = DID_ERROR << 16;
815 done(cmd);
816 return 0;
817}
818
819static int idescsi_eh_abort (struct scsi_cmnd *cmd)
820{
821 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
822 ide_drive_t *drive = scsi->drive;
823 int busy;
824 int ret = FAILED;
825
826 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
827
828 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
829 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
830
831 if (!drive) {
832 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
833 WARN_ON(1);
834 goto no_drive;
835 }
836
837 /* First give it some more time, how much is "right" is hard to say :-( */
838
839 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
840 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
841 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
842
843 spin_lock_irq(&ide_lock);
844
845 /* If there is no pc running we're done (our interrupt took care of it) */
846 if (!scsi->pc) {
847 ret = SUCCESS;
848 goto ide_unlock;
849 }
850
851 /* It's somewhere in flight. Does ide subsystem agree? */
852 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
853 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
854 /*
855 * FIXME - not sure this condition can ever occur
856 */
857 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
858
4aff5e23 859 if (blk_sense_request(scsi->pc->rq))
1da177e4
LT		 860 kfree(scsi->pc->buffer);
861 kfree(scsi->pc->rq);
862 kfree(scsi->pc);
863 scsi->pc = NULL;
864
865 ret = SUCCESS;
866 }
867
868ide_unlock:
869 spin_unlock_irq(&ide_lock);
870no_drive:
871 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
872 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
873
874 return ret;
875}
876
877static int idescsi_eh_reset (struct scsi_cmnd *cmd)
878{
879 struct request *req;
880 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
881 ide_drive_t *drive = scsi->drive;
882 int ready = 0;
883 int ret = SUCCESS;
884
885 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
886
887 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
888 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
889
890 if (!drive) {
891 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
892 WARN_ON(1);
893 return FAILED;
894 }
895
df0ae249
JG		 896 spin_lock_irq(cmd->device->host->host_lock);
897 spin_lock(&ide_lock);
1da177e4
LT		 898
899 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
900 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
901 spin_unlock(&ide_lock);
df0ae249 902 spin_unlock_irq(cmd->device->host->host_lock);
1da177e4
LT		 903 return FAILED;
904 }
905
906 /* kill current request */
5a330e39
KU		 907 if (__blk_end_request(req, -EIO, 0))
908 BUG();
4aff5e23 909 if (blk_sense_request(req))
1da177e4
LT		 910 kfree(scsi->pc->buffer);
911 kfree(scsi->pc);
912 scsi->pc = NULL;
913 kfree(req);
914
915 /* now nuke the drive queue */
916 while ((req = elv_next_request(drive->queue))) {
5a330e39
KU		 917 if (__blk_end_request(req, -EIO, 0))
918 BUG();
1da177e4
LT		 919 }
920
921 HWGROUP(drive)->rq = NULL;
922 HWGROUP(drive)->handler = NULL;
923 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
df0ae249 924 spin_unlock(&ide_lock);
1da177e4
LT		 925
926 ide_do_reset(drive);
927
928 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
929
930 do {
1da177e4 931 spin_unlock_irq(cmd->device->host->host_lock);
df0ae249 932 msleep(50);
1da177e4
LT		 933 spin_lock_irq(cmd->device->host->host_lock);
934 } while ( HWGROUP(drive)->handler );
935
936 ready = drive_is_ready(drive);
937 HWGROUP(drive)->busy--;
938 if (!ready) {
939 printk (KERN_ERR "ide-scsi: reset failed!\n");
940 ret = FAILED;
941 }
942
df0ae249 943 spin_unlock_irq(cmd->device->host->host_lock);
1da177e4
LT		 944 return ret;
945}
946
947static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
948 sector_t capacity, int *parm)
949{
950 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
951 ide_drive_t *drive = idescsi->drive;
952
953 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
954 parm[0] = drive->bios_head;
955 parm[1] = drive->bios_sect;
956 parm[2] = drive->bios_cyl;
957 }
958 return 0;
959}
960
961static struct scsi_host_template idescsi_template = {
962 .module = THIS_MODULE,
963 .name = "idescsi",
964 .info = idescsi_info,
965 .slave_configure = idescsi_slave_configure,
966 .ioctl = idescsi_ioctl,
967 .queuecommand = idescsi_queue,
968 .eh_abort_handler = idescsi_eh_abort,
969 .eh_host_reset_handler = idescsi_eh_reset,
970 .bios_param = idescsi_bios,
971 .can_queue = 40,
972 .this_id = -1,
973 .sg_tablesize = 256,
974 .cmd_per_lun = 5,
975 .max_sectors = 128,
976 .use_clustering = DISABLE_CLUSTERING,
977 .emulated = 1,
978 .proc_name = "ide-scsi",
979};
980
b62735d9 981static int ide_scsi_probe(ide_drive_t *drive)
1da177e4
LT		 982{
983 idescsi_scsi_t *idescsi;
984 struct Scsi_Host *host;
985 struct gendisk *g;
986 static int warned;
987 int err = -ENOMEM;
988
989 if (!warned && drive->media == ide_cdrom) {
990 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
991 warned = 1;
992 }
993
aaeab80b
AC		 994 if (idescsi_nocd && drive->media == ide_cdrom)
995 return -ENODEV;
996
1da177e4
LT		 997 if (!strstr("ide-scsi", drive->driver_req) ||
998 !drive->present ||
999 drive->media == ide_disk ||
1000 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
8604affd 1001 return -ENODEV;
1da177e4
LT		 1002
1003 g = alloc_disk(1 << PARTN_BITS);
1004 if (!g)
1005 goto out_host_put;
1006
1007 ide_init_disk(g, drive);
1008
1009 host->max_id = 1;
1010
1011#if IDESCSI_DEBUG_LOG
1012 if (drive->id->last_lun)
1013 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1014#endif
1015 if ((drive->id->last_lun & 0x7) != 7)
1016 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1017 else
1018 host->max_lun = 1;
1019
1020 drive->driver_data = host;
1021 idescsi = scsihost_to_idescsi(host);
1022 idescsi->drive = drive;
1023 idescsi->driver = &idescsi_driver;
1024 idescsi->host = host;
1025 idescsi->disk = g;
1026 g->private_data = &idescsi->driver;
7662d046 1027 ide_proc_register_driver(drive, &idescsi_driver);
8604affd
BZ		 1028 err = 0;
1029 idescsi_setup(drive, idescsi);
1030 g->fops = &idescsi_ops;
1031 ide_register_region(g);
1032 err = scsi_add_host(host, &drive->gendev);
1da177e4 1033 if (!err) {
8604affd
BZ		 1034 scsi_scan_host(host);
1035 return 0;
1da177e4 1036 }
8604affd
BZ		 1037 /* fall through on error */
1038 ide_unregister_region(g);
7662d046 1039 ide_proc_unregister_driver(drive, &idescsi_driver);
1da177e4
LT		 1040
1041 put_disk(g);
1042out_host_put:
1043 scsi_host_put(host);
1044 return err;
1045}
1046
1047static int __init init_idescsi_module(void)
1048{
8604affd 1049 return driver_register(&idescsi_driver.gen_driver);
1da177e4
LT		 1050}
1051
1052static void __exit exit_idescsi_module(void)
1053{
8604affd 1054 driver_unregister(&idescsi_driver.gen_driver);
1da177e4
LT		 1055}
1056
aaeab80b
AC		 1057module_param(idescsi_nocd, int, 0600);
1058MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1da177e4
LT		 1059module_init(init_idescsi_module);
1060module_exit(exit_idescsi_module);
1061MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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