2 * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999
4 * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
8 * Emulation of a SCSI host adapter for IDE ATAPI devices.
10 * With this driver, one can use the Linux SCSI drivers instead of the
11 * native IDE ATAPI drivers.
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
34 #define IDESCSI_VERSION "0.92"
36 #include <linux/module.h>
37 #include <linux/types.h>
38 #include <linux/string.h>
39 #include <linux/kernel.h>
41 #include <linux/ioport.h>
42 #include <linux/blkdev.h>
43 #include <linux/errno.h>
44 #include <linux/hdreg.h>
45 #include <linux/slab.h>
46 #include <linux/ide.h>
47 #include <linux/scatterlist.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
52 #include <asm/bitops.h>
53 #include <asm/uaccess.h>
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>
62 #define IDESCSI_DEBUG_LOG 0
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 */
81 * Packet command status bits.
83 #define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */
84 #define PC_WRITING 1 /* Data direction */
85 #define PC_TIMEDOUT 3 /* command timed out */
86 #define PC_DMA_OK 4 /* Use DMA */
89 * SCSI command transformation layer
91 #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
96 #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
98 typedef struct ide_scsi_obj
{
100 ide_driver_t
*driver
;
101 struct gendisk
*disk
;
102 struct Scsi_Host
*host
;
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 */
110 static DEFINE_MUTEX(idescsi_ref_mutex
);
111 static int idescsi_nocd
; /* Set by module param to skip cd */
113 #define ide_scsi_g(disk) \
114 container_of((disk)->private_data, struct ide_scsi_obj, driver)
116 static struct ide_scsi_obj
*ide_scsi_get(struct gendisk
*disk
)
118 struct ide_scsi_obj
*scsi
= NULL
;
120 mutex_lock(&idescsi_ref_mutex
);
121 scsi
= ide_scsi_g(disk
);
123 scsi_host_get(scsi
->host
);
124 mutex_unlock(&idescsi_ref_mutex
);
128 static void ide_scsi_put(struct ide_scsi_obj
*scsi
)
130 mutex_lock(&idescsi_ref_mutex
);
131 scsi_host_put(scsi
->host
);
132 mutex_unlock(&idescsi_ref_mutex
);
135 static inline idescsi_scsi_t
*scsihost_to_idescsi(struct Scsi_Host
*host
)
137 return (idescsi_scsi_t
*) (&host
[1]);
140 static inline idescsi_scsi_t
*drive_to_idescsi(ide_drive_t
*ide_drive
)
142 return scsihost_to_idescsi(ide_drive
->driver_data
);
146 * Per ATAPI device status bits.
148 #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
153 #define IDESCSI_PC_RQ 90
155 static void idescsi_discard_data (ide_drive_t
*drive
, unsigned int bcount
)
158 (void) HWIF(drive
)->INB(IDE_DATA_REG
);
161 static void idescsi_output_zeros (ide_drive_t
*drive
, unsigned int bcount
)
164 HWIF(drive
)->OUTB(0, IDE_DATA_REG
);
168 * PIO data transfer routines using the scatter gather table.
170 static void idescsi_input_buffers (ide_drive_t
*drive
, idescsi_pc_t
*pc
, unsigned int bcount
)
176 if (pc
->sg
- scsi_sglist(pc
->scsi_cmd
) >
177 scsi_sg_count(pc
->scsi_cmd
)) {
178 printk (KERN_ERR
"ide-scsi: scatter gather table too small, discarding data\n");
179 idescsi_discard_data (drive
, bcount
);
182 count
= min(pc
->sg
->length
- pc
->b_count
, bcount
);
183 if (PageHighMem(pc
->sg
->page
)) {
186 local_irq_save(flags
);
187 buf
= kmap_atomic(pc
->sg
->page
, KM_IRQ0
) +
189 drive
->hwif
->atapi_input_bytes(drive
,
190 buf
+ pc
->b_count
, count
);
191 kunmap_atomic(buf
- pc
->sg
->offset
, KM_IRQ0
);
192 local_irq_restore(flags
);
194 buf
= page_address(pc
->sg
->page
) + pc
->sg
->offset
;
195 drive
->hwif
->atapi_input_bytes(drive
,
196 buf
+ pc
->b_count
, count
);
198 bcount
-= count
; pc
->b_count
+= count
;
199 if (pc
->b_count
== pc
->sg
->length
) {
206 static void idescsi_output_buffers (ide_drive_t
*drive
, idescsi_pc_t
*pc
, unsigned int bcount
)
212 if (pc
->sg
- scsi_sglist(pc
->scsi_cmd
) >
213 scsi_sg_count(pc
->scsi_cmd
)) {
214 printk (KERN_ERR
"ide-scsi: scatter gather table too small, padding with zeros\n");
215 idescsi_output_zeros (drive
, bcount
);
218 count
= min(pc
->sg
->length
- pc
->b_count
, bcount
);
219 if (PageHighMem(pc
->sg
->page
)) {
222 local_irq_save(flags
);
223 buf
= kmap_atomic(pc
->sg
->page
, KM_IRQ0
) +
225 drive
->hwif
->atapi_output_bytes(drive
,
226 buf
+ pc
->b_count
, count
);
227 kunmap_atomic(buf
- pc
->sg
->offset
, KM_IRQ0
);
228 local_irq_restore(flags
);
230 buf
= page_address(pc
->sg
->page
) + pc
->sg
->offset
;
231 drive
->hwif
->atapi_output_bytes(drive
,
232 buf
+ pc
->b_count
, count
);
234 bcount
-= count
; pc
->b_count
+= count
;
235 if (pc
->b_count
== pc
->sg
->length
) {
242 static void hexdump(u8
*x
, int len
)
247 for (i
= 0; i
< len
; i
++)
252 static int idescsi_check_condition(ide_drive_t
*drive
, struct request
*failed_command
)
254 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
259 /* stuff a sense request in front of our current request */
260 pc
= kzalloc(sizeof(idescsi_pc_t
), GFP_ATOMIC
);
261 rq
= kmalloc(sizeof(struct request
), GFP_ATOMIC
);
262 buf
= kzalloc(SCSI_SENSE_BUFFERSIZE
, GFP_ATOMIC
);
263 if (!pc
|| !rq
|| !buf
) {
269 ide_init_drive_cmd(rq
);
270 rq
->special
= (char *) pc
;
273 pc
->c
[0] = REQUEST_SENSE
;
274 pc
->c
[4] = pc
->request_transfer
= pc
->buffer_size
= SCSI_SENSE_BUFFERSIZE
;
275 rq
->cmd_type
= REQ_TYPE_SENSE
;
276 pc
->timeout
= jiffies
+ WAIT_READY
;
277 /* NOTE! Save the failed packet command in "rq->buffer" */
278 rq
->buffer
= (void *) failed_command
->special
;
279 pc
->scsi_cmd
= ((idescsi_pc_t
*) failed_command
->special
)->scsi_cmd
;
280 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
)) {
281 printk ("ide-scsi: %s: queue cmd = ", drive
->name
);
284 rq
->rq_disk
= scsi
->disk
;
285 return ide_do_drive_cmd(drive
, rq
, ide_preempt
);
288 static int idescsi_end_request(ide_drive_t
*, int, int);
290 static ide_startstop_t
291 idescsi_atapi_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
293 if (HWIF(drive
)->INB(IDE_STATUS_REG
) & (BUSY_STAT
|DRQ_STAT
))
295 HWIF(drive
)->OUTB(WIN_IDLEIMMEDIATE
,IDE_COMMAND_REG
);
299 idescsi_end_request(drive
, 0, 0);
304 static ide_startstop_t
305 idescsi_atapi_abort(ide_drive_t
*drive
, struct request
*rq
)
307 #if IDESCSI_DEBUG_LOG
308 printk(KERN_WARNING
"idescsi_atapi_abort called for %lu\n",
309 ((idescsi_pc_t
*) rq
->special
)->scsi_cmd
->serial_number
);
311 rq
->errors
|= ERROR_MAX
;
313 idescsi_end_request(drive
, 0, 0);
318 static int idescsi_end_request (ide_drive_t
*drive
, int uptodate
, int nrsecs
)
320 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
321 struct request
*rq
= HWGROUP(drive
)->rq
;
322 idescsi_pc_t
*pc
= (idescsi_pc_t
*) rq
->special
;
323 int log
= test_bit(IDESCSI_LOG_CMD
, &scsi
->log
);
324 struct Scsi_Host
*host
;
325 int errors
= rq
->errors
;
328 if (!blk_special_request(rq
) && !blk_sense_request(rq
)) {
329 ide_end_request(drive
, uptodate
, nrsecs
);
332 ide_end_drive_cmd (drive
, 0, 0);
333 if (blk_sense_request(rq
)) {
334 idescsi_pc_t
*opc
= (idescsi_pc_t
*) rq
->buffer
;
336 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive
->name
, opc
->scsi_cmd
->serial_number
);
337 hexdump(pc
->buffer
,16);
339 memcpy((void *) opc
->scsi_cmd
->sense_buffer
, pc
->buffer
, SCSI_SENSE_BUFFERSIZE
);
345 pc
->scsi_cmd
->result
= (CHECK_CONDITION
<< 1) |
346 ((test_bit(PC_TIMEDOUT
, &pc
->flags
)?DID_TIME_OUT
:DID_OK
) << 16);
347 } else if (test_bit(PC_TIMEDOUT
, &pc
->flags
)) {
349 printk (KERN_WARNING
"ide-scsi: %s: timed out for %lu\n",
350 drive
->name
, pc
->scsi_cmd
->serial_number
);
351 pc
->scsi_cmd
->result
= DID_TIME_OUT
<< 16;
352 } else if (errors
>= ERROR_MAX
) {
353 pc
->scsi_cmd
->result
= DID_ERROR
<< 16;
355 printk ("ide-scsi: %s: I/O error for %lu\n", drive
->name
, pc
->scsi_cmd
->serial_number
);
358 printk ("ide-scsi: %s: check condition for %lu\n", drive
->name
, pc
->scsi_cmd
->serial_number
);
359 if (!idescsi_check_condition(drive
, rq
))
360 /* we started a request sense, so we'll be back, exit for now */
362 pc
->scsi_cmd
->result
= (CHECK_CONDITION
<< 1) | (DID_OK
<< 16);
364 pc
->scsi_cmd
->result
= DID_OK
<< 16;
366 host
= pc
->scsi_cmd
->device
->host
;
367 spin_lock_irqsave(host
->host_lock
, flags
);
368 pc
->done(pc
->scsi_cmd
);
369 spin_unlock_irqrestore(host
->host_lock
, flags
);
376 static inline unsigned long get_timeout(idescsi_pc_t
*pc
)
378 return max_t(unsigned long, WAIT_CMD
, pc
->timeout
- jiffies
);
381 static int idescsi_expiry(ide_drive_t
*drive
)
383 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
384 idescsi_pc_t
*pc
= scsi
->pc
;
386 #if IDESCSI_DEBUG_LOG
387 printk(KERN_WARNING
"idescsi_expiry called for %lu at %lu\n", pc
->scsi_cmd
->serial_number
, jiffies
);
389 set_bit(PC_TIMEDOUT
, &pc
->flags
);
391 return 0; /* we do not want the ide subsystem to retry */
395 * Our interrupt handler.
397 static ide_startstop_t
idescsi_pc_intr (ide_drive_t
*drive
)
399 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
400 idescsi_pc_t
*pc
=scsi
->pc
;
401 struct request
*rq
= pc
->rq
;
402 atapi_bcount_t bcount
;
403 atapi_status_t status
;
404 atapi_ireason_t ireason
;
405 atapi_feature_t feature
;
409 #if IDESCSI_DEBUG_LOG
410 printk (KERN_INFO
"ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
411 #endif /* IDESCSI_DEBUG_LOG */
413 if (test_bit(PC_TIMEDOUT
, &pc
->flags
)){
414 #if IDESCSI_DEBUG_LOG
415 printk(KERN_WARNING
"idescsi_pc_intr: got timed out packet %lu at %lu\n",
416 pc
->scsi_cmd
->serial_number
, jiffies
);
418 /* end this request now - scsi should retry it*/
419 idescsi_end_request (drive
, 1, 0);
422 if (test_and_clear_bit (PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
423 #if IDESCSI_DEBUG_LOG
424 printk ("ide-scsi: %s: DMA complete\n", drive
->name
);
425 #endif /* IDESCSI_DEBUG_LOG */
426 pc
->actually_transferred
=pc
->request_transfer
;
427 (void) HWIF(drive
)->ide_dma_end(drive
);
431 /* Clear the interrupt */
432 status
.all
= HWIF(drive
)->INB(IDE_STATUS_REG
);
435 /* No more interrupts */
436 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
))
437 printk (KERN_INFO
"Packet command completed, %d bytes transferred\n", pc
->actually_transferred
);
438 local_irq_enable_in_hardirq();
441 idescsi_end_request (drive
, 1, 0);
444 bcount
.b
.low
= HWIF(drive
)->INB(IDE_BCOUNTL_REG
);
445 bcount
.b
.high
= HWIF(drive
)->INB(IDE_BCOUNTH_REG
);
446 ireason
.all
= HWIF(drive
)->INB(IDE_IREASON_REG
);
449 printk(KERN_ERR
"ide-scsi: CoD != 0 in idescsi_pc_intr\n");
450 return ide_do_reset (drive
);
453 temp
= pc
->actually_transferred
+ bcount
.all
;
454 if (temp
> pc
->request_transfer
) {
455 if (temp
> pc
->buffer_size
) {
456 printk(KERN_ERR
"ide-scsi: The scsi wants to "
457 "send us more data than expected "
458 "- discarding data\n");
459 temp
= pc
->buffer_size
- pc
->actually_transferred
;
461 clear_bit(PC_WRITING
, &pc
->flags
);
463 idescsi_input_buffers(drive
, pc
, temp
);
465 drive
->hwif
->atapi_input_bytes(drive
, pc
->current_position
, temp
);
466 printk(KERN_ERR
"ide-scsi: transferred %d of %d bytes\n", temp
, bcount
.all
);
468 pc
->actually_transferred
+= temp
;
469 pc
->current_position
+= temp
;
470 idescsi_discard_data(drive
, bcount
.all
- temp
);
471 ide_set_handler(drive
, &idescsi_pc_intr
, get_timeout(pc
), idescsi_expiry
);
474 #if IDESCSI_DEBUG_LOG
475 printk (KERN_NOTICE
"ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
476 #endif /* IDESCSI_DEBUG_LOG */
480 clear_bit(PC_WRITING
, &pc
->flags
);
482 idescsi_input_buffers(drive
, pc
, bcount
.all
);
484 HWIF(drive
)->atapi_input_bytes(drive
, pc
->current_position
, bcount
.all
);
486 set_bit(PC_WRITING
, &pc
->flags
);
488 idescsi_output_buffers (drive
, pc
, bcount
.all
);
490 HWIF(drive
)->atapi_output_bytes(drive
, pc
->current_position
, bcount
.all
);
492 /* Update the current position */
493 pc
->actually_transferred
+= bcount
.all
;
494 pc
->current_position
+= bcount
.all
;
496 /* And set the interrupt handler again */
497 ide_set_handler(drive
, &idescsi_pc_intr
, get_timeout(pc
), idescsi_expiry
);
501 static ide_startstop_t
idescsi_transfer_pc(ide_drive_t
*drive
)
503 ide_hwif_t
*hwif
= drive
->hwif
;
504 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
505 idescsi_pc_t
*pc
= scsi
->pc
;
506 atapi_ireason_t ireason
;
507 ide_startstop_t startstop
;
509 if (ide_wait_stat(&startstop
,drive
,DRQ_STAT
,BUSY_STAT
,WAIT_READY
)) {
510 printk(KERN_ERR
"ide-scsi: Strange, packet command "
511 "initiated yet DRQ isn't asserted\n");
514 ireason
.all
= HWIF(drive
)->INB(IDE_IREASON_REG
);
515 if (!ireason
.b
.cod
|| ireason
.b
.io
) {
516 printk(KERN_ERR
"ide-scsi: (IO,CoD) != (0,1) while "
517 "issuing a packet command\n");
518 return ide_do_reset (drive
);
520 BUG_ON(HWGROUP(drive
)->handler
!= NULL
);
521 /* Set the interrupt routine */
522 ide_set_handler(drive
, &idescsi_pc_intr
, get_timeout(pc
), idescsi_expiry
);
523 /* Send the actual packet */
524 drive
->hwif
->atapi_output_bytes(drive
, scsi
->pc
->c
, 12);
525 if (test_bit (PC_DMA_OK
, &pc
->flags
)) {
526 set_bit (PC_DMA_IN_PROGRESS
, &pc
->flags
);
527 hwif
->dma_start(drive
);
532 static inline int idescsi_set_direction(idescsi_pc_t
*pc
)
535 case READ_6
: case READ_10
: case READ_12
:
536 clear_bit(PC_WRITING
, &pc
->flags
);
538 case WRITE_6
: case WRITE_10
: case WRITE_12
:
539 set_bit(PC_WRITING
, &pc
->flags
);
546 static int idescsi_map_sg(ide_drive_t
*drive
, idescsi_pc_t
*pc
)
548 ide_hwif_t
*hwif
= drive
->hwif
;
549 struct scatterlist
*sg
, *scsi_sg
;
552 if (!pc
->request_transfer
|| pc
->request_transfer
% 1024)
555 if (idescsi_set_direction(pc
))
559 scsi_sg
= scsi_sglist(pc
->scsi_cmd
);
560 segments
= scsi_sg_count(pc
->scsi_cmd
);
562 if (segments
> hwif
->sg_max_nents
)
565 hwif
->sg_nents
= segments
;
566 memcpy(sg
, scsi_sg
, sizeof(*sg
) * segments
);
572 * Issue a packet command
574 static ide_startstop_t
idescsi_issue_pc (ide_drive_t
*drive
, idescsi_pc_t
*pc
)
576 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
577 ide_hwif_t
*hwif
= drive
->hwif
;
578 atapi_feature_t feature
;
579 atapi_bcount_t bcount
;
581 scsi
->pc
=pc
; /* Set the current packet command */
582 pc
->actually_transferred
=0; /* We haven't transferred any data yet */
583 pc
->current_position
=pc
->buffer
;
584 bcount
.all
= min(pc
->request_transfer
, 63 * 1024); /* Request to transfer the entire buffer at once */
587 if (drive
->using_dma
&& !idescsi_map_sg(drive
, pc
)) {
589 feature
.b
.dma
= !hwif
->dma_setup(drive
);
595 HWIF(drive
)->OUTB(drive
->ctl
, IDE_CONTROL_REG
);
597 HWIF(drive
)->OUTB(feature
.all
, IDE_FEATURE_REG
);
598 HWIF(drive
)->OUTB(bcount
.b
.high
, IDE_BCOUNTH_REG
);
599 HWIF(drive
)->OUTB(bcount
.b
.low
, IDE_BCOUNTL_REG
);
602 set_bit(PC_DMA_OK
, &pc
->flags
);
604 if (test_bit(IDESCSI_DRQ_INTERRUPT
, &scsi
->flags
)) {
605 BUG_ON(HWGROUP(drive
)->handler
!= NULL
);
606 ide_set_handler(drive
, &idescsi_transfer_pc
,
607 get_timeout(pc
), idescsi_expiry
);
608 /* Issue the packet command */
609 HWIF(drive
)->OUTB(WIN_PACKETCMD
, IDE_COMMAND_REG
);
612 /* Issue the packet command */
613 HWIF(drive
)->OUTB(WIN_PACKETCMD
, IDE_COMMAND_REG
);
614 return idescsi_transfer_pc(drive
);
619 * idescsi_do_request is our request handling function.
621 static ide_startstop_t
idescsi_do_request (ide_drive_t
*drive
, struct request
*rq
, sector_t block
)
623 #if IDESCSI_DEBUG_LOG
624 printk (KERN_INFO
"dev: %s, cmd: %x, errors: %d\n", rq
->rq_disk
->disk_name
,rq
->cmd
[0],rq
->errors
);
625 printk (KERN_INFO
"sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq
->sector
,rq
->nr_sectors
,rq
->current_nr_sectors
);
626 #endif /* IDESCSI_DEBUG_LOG */
628 if (blk_sense_request(rq
) || blk_special_request(rq
)) {
629 return idescsi_issue_pc (drive
, (idescsi_pc_t
*) rq
->special
);
631 blk_dump_rq_flags(rq
, "ide-scsi: unsup command");
632 idescsi_end_request (drive
, 0, 0);
636 #ifdef CONFIG_IDE_PROC_FS
637 static void idescsi_add_settings(ide_drive_t
*drive
)
639 idescsi_scsi_t
*scsi
= drive_to_idescsi(drive
);
642 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
644 ide_add_setting(drive
, "bios_cyl", SETTING_RW
, TYPE_INT
, 0, 1023, 1, 1, &drive
->bios_cyl
, NULL
);
645 ide_add_setting(drive
, "bios_head", SETTING_RW
, TYPE_BYTE
, 0, 255, 1, 1, &drive
->bios_head
, NULL
);
646 ide_add_setting(drive
, "bios_sect", SETTING_RW
, TYPE_BYTE
, 0, 63, 1, 1, &drive
->bios_sect
, NULL
);
647 ide_add_setting(drive
, "transform", SETTING_RW
, TYPE_INT
, 0, 3, 1, 1, &scsi
->transform
, NULL
);
648 ide_add_setting(drive
, "log", SETTING_RW
, TYPE_INT
, 0, 1, 1, 1, &scsi
->log
, NULL
);
651 static inline void idescsi_add_settings(ide_drive_t
*drive
) { ; }
655 * Driver initialization.
657 static void idescsi_setup (ide_drive_t
*drive
, idescsi_scsi_t
*scsi
)
659 if (drive
->id
&& (drive
->id
->config
& 0x0060) == 0x20)
660 set_bit (IDESCSI_DRQ_INTERRUPT
, &scsi
->flags
);
661 clear_bit(IDESCSI_SG_TRANSFORM
, &scsi
->transform
);
662 #if IDESCSI_DEBUG_LOG
663 set_bit(IDESCSI_LOG_CMD
, &scsi
->log
);
664 #endif /* IDESCSI_DEBUG_LOG */
665 idescsi_add_settings(drive
);
668 static void ide_scsi_remove(ide_drive_t
*drive
)
670 struct Scsi_Host
*scsihost
= drive
->driver_data
;
671 struct ide_scsi_obj
*scsi
= scsihost_to_idescsi(scsihost
);
672 struct gendisk
*g
= scsi
->disk
;
674 ide_proc_unregister_driver(drive
, scsi
->driver
);
676 ide_unregister_region(g
);
678 drive
->driver_data
= NULL
;
679 g
->private_data
= NULL
;
682 scsi_remove_host(scsihost
);
686 static int ide_scsi_probe(ide_drive_t
*);
688 #ifdef CONFIG_IDE_PROC_FS
689 static ide_proc_entry_t idescsi_proc
[] = {
690 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
691 { NULL
, 0, NULL
, NULL
}
695 static ide_driver_t idescsi_driver
= {
697 .owner
= THIS_MODULE
,
699 .bus
= &ide_bus_type
,
701 .probe
= ide_scsi_probe
,
702 .remove
= ide_scsi_remove
,
703 .version
= IDESCSI_VERSION
,
705 .supports_dsc_overlap
= 0,
706 .do_request
= idescsi_do_request
,
707 .end_request
= idescsi_end_request
,
708 .error
= idescsi_atapi_error
,
709 .abort
= idescsi_atapi_abort
,
710 #ifdef CONFIG_IDE_PROC_FS
711 .proc
= idescsi_proc
,
715 static int idescsi_ide_open(struct inode
*inode
, struct file
*filp
)
717 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
718 struct ide_scsi_obj
*scsi
;
720 if (!(scsi
= ide_scsi_get(disk
)))
726 static int idescsi_ide_release(struct inode
*inode
, struct file
*filp
)
728 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
729 struct ide_scsi_obj
*scsi
= ide_scsi_g(disk
);
736 static int idescsi_ide_ioctl(struct inode
*inode
, struct file
*file
,
737 unsigned int cmd
, unsigned long arg
)
739 struct block_device
*bdev
= inode
->i_bdev
;
740 struct ide_scsi_obj
*scsi
= ide_scsi_g(bdev
->bd_disk
);
741 return generic_ide_ioctl(scsi
->drive
, file
, bdev
, cmd
, arg
);
744 static struct block_device_operations idescsi_ops
= {
745 .owner
= THIS_MODULE
,
746 .open
= idescsi_ide_open
,
747 .release
= idescsi_ide_release
,
748 .ioctl
= idescsi_ide_ioctl
,
751 static int idescsi_slave_configure(struct scsi_device
* sdp
)
753 /* Configure detected device */
754 sdp
->use_10_for_rw
= 1;
755 sdp
->use_10_for_ms
= 1;
756 scsi_adjust_queue_depth(sdp
, MSG_SIMPLE_TAG
, sdp
->host
->cmd_per_lun
);
760 static const char *idescsi_info (struct Scsi_Host
*host
)
762 return "SCSI host adapter emulation for IDE ATAPI devices";
765 static int idescsi_ioctl (struct scsi_device
*dev
, int cmd
, void __user
*arg
)
767 idescsi_scsi_t
*scsi
= scsihost_to_idescsi(dev
->host
);
769 if (cmd
== SG_SET_TRANSFORM
) {
771 set_bit(IDESCSI_SG_TRANSFORM
, &scsi
->transform
);
773 clear_bit(IDESCSI_SG_TRANSFORM
, &scsi
->transform
);
775 } else if (cmd
== SG_GET_TRANSFORM
)
776 return put_user(test_bit(IDESCSI_SG_TRANSFORM
, &scsi
->transform
), (int __user
*) arg
);
780 static int idescsi_queue (struct scsi_cmnd
*cmd
,
781 void (*done
)(struct scsi_cmnd
*))
783 struct Scsi_Host
*host
= cmd
->device
->host
;
784 idescsi_scsi_t
*scsi
= scsihost_to_idescsi(host
);
785 ide_drive_t
*drive
= scsi
->drive
;
786 struct request
*rq
= NULL
;
787 idescsi_pc_t
*pc
= NULL
;
790 scmd_printk (KERN_ERR
, cmd
, "drive not present\n");
793 scsi
= drive_to_idescsi(drive
);
794 pc
= kmalloc (sizeof (idescsi_pc_t
), GFP_ATOMIC
);
795 rq
= kmalloc (sizeof (struct request
), GFP_ATOMIC
);
796 if (rq
== NULL
|| pc
== NULL
) {
797 printk (KERN_ERR
"ide-scsi: %s: out of memory\n", drive
->name
);
801 memset (pc
->c
, 0, 12);
804 memcpy (pc
->c
, cmd
->cmnd
, cmd
->cmd_len
);
806 pc
->sg
= scsi_sglist(cmd
);
808 pc
->request_transfer
= pc
->buffer_size
= scsi_bufflen(cmd
);
811 pc
->timeout
= jiffies
+ cmd
->timeout_per_command
;
813 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
)) {
814 printk ("ide-scsi: %s: que %lu, cmd = ", drive
->name
, cmd
->serial_number
);
815 hexdump(cmd
->cmnd
, cmd
->cmd_len
);
816 if (memcmp(pc
->c
, cmd
->cmnd
, cmd
->cmd_len
)) {
817 printk ("ide-scsi: %s: que %lu, tsl = ", drive
->name
, cmd
->serial_number
);
822 ide_init_drive_cmd (rq
);
823 rq
->special
= (char *) pc
;
824 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
825 spin_unlock_irq(host
->host_lock
);
826 rq
->rq_disk
= scsi
->disk
;
827 (void) ide_do_drive_cmd (drive
, rq
, ide_end
);
828 spin_lock_irq(host
->host_lock
);
833 cmd
->result
= DID_ERROR
<< 16;
838 static int idescsi_eh_abort (struct scsi_cmnd
*cmd
)
840 idescsi_scsi_t
*scsi
= scsihost_to_idescsi(cmd
->device
->host
);
841 ide_drive_t
*drive
= scsi
->drive
;
845 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
847 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
))
848 printk (KERN_WARNING
"ide-scsi: abort called for %lu\n", cmd
->serial_number
);
851 printk (KERN_WARNING
"ide-scsi: Drive not set in idescsi_eh_abort\n");
856 /* First give it some more time, how much is "right" is hard to say :-( */
858 busy
= ide_wait_not_busy(HWIF(drive
), 100); /* FIXME - uses mdelay which causes latency? */
859 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
))
860 printk (KERN_WARNING
"ide-scsi: drive did%s become ready\n", busy
?" not":"");
862 spin_lock_irq(&ide_lock
);
864 /* If there is no pc running we're done (our interrupt took care of it) */
870 /* It's somewhere in flight. Does ide subsystem agree? */
871 if (scsi
->pc
->scsi_cmd
->serial_number
== cmd
->serial_number
&& !busy
&&
872 elv_queue_empty(drive
->queue
) && HWGROUP(drive
)->rq
!= scsi
->pc
->rq
) {
874 * FIXME - not sure this condition can ever occur
876 printk (KERN_ERR
"ide-scsi: cmd aborted!\n");
878 if (blk_sense_request(scsi
->pc
->rq
))
879 kfree(scsi
->pc
->buffer
);
888 spin_unlock_irq(&ide_lock
);
890 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
))
891 printk (KERN_WARNING
"ide-scsi: abort returns %s\n", ret
== SUCCESS
?"success":"failed");
896 static int idescsi_eh_reset (struct scsi_cmnd
*cmd
)
899 idescsi_scsi_t
*scsi
= scsihost_to_idescsi(cmd
->device
->host
);
900 ide_drive_t
*drive
= scsi
->drive
;
904 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
906 if (test_bit(IDESCSI_LOG_CMD
, &scsi
->log
))
907 printk (KERN_WARNING
"ide-scsi: reset called for %lu\n", cmd
->serial_number
);
910 printk (KERN_WARNING
"ide-scsi: Drive not set in idescsi_eh_reset\n");
915 spin_lock_irq(cmd
->device
->host
->host_lock
);
916 spin_lock(&ide_lock
);
918 if (!scsi
->pc
|| (req
= scsi
->pc
->rq
) != HWGROUP(drive
)->rq
|| !HWGROUP(drive
)->handler
) {
919 printk (KERN_WARNING
"ide-scsi: No active request in idescsi_eh_reset\n");
920 spin_unlock(&ide_lock
);
921 spin_unlock_irq(cmd
->device
->host
->host_lock
);
925 /* kill current request */
926 blkdev_dequeue_request(req
);
927 end_that_request_last(req
, 0);
928 if (blk_sense_request(req
))
929 kfree(scsi
->pc
->buffer
);
934 /* now nuke the drive queue */
935 while ((req
= elv_next_request(drive
->queue
))) {
936 blkdev_dequeue_request(req
);
937 end_that_request_last(req
, 0);
940 HWGROUP(drive
)->rq
= NULL
;
941 HWGROUP(drive
)->handler
= NULL
;
942 HWGROUP(drive
)->busy
= 1; /* will set this to zero when ide reset finished */
943 spin_unlock(&ide_lock
);
947 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
950 spin_unlock_irq(cmd
->device
->host
->host_lock
);
952 spin_lock_irq(cmd
->device
->host
->host_lock
);
953 } while ( HWGROUP(drive
)->handler
);
955 ready
= drive_is_ready(drive
);
956 HWGROUP(drive
)->busy
--;
958 printk (KERN_ERR
"ide-scsi: reset failed!\n");
962 spin_unlock_irq(cmd
->device
->host
->host_lock
);
966 static int idescsi_bios(struct scsi_device
*sdev
, struct block_device
*bdev
,
967 sector_t capacity
, int *parm
)
969 idescsi_scsi_t
*idescsi
= scsihost_to_idescsi(sdev
->host
);
970 ide_drive_t
*drive
= idescsi
->drive
;
972 if (drive
->bios_cyl
&& drive
->bios_head
&& drive
->bios_sect
) {
973 parm
[0] = drive
->bios_head
;
974 parm
[1] = drive
->bios_sect
;
975 parm
[2] = drive
->bios_cyl
;
980 static struct scsi_host_template idescsi_template
= {
981 .module
= THIS_MODULE
,
983 .info
= idescsi_info
,
984 .slave_configure
= idescsi_slave_configure
,
985 .ioctl
= idescsi_ioctl
,
986 .queuecommand
= idescsi_queue
,
987 .eh_abort_handler
= idescsi_eh_abort
,
988 .eh_host_reset_handler
= idescsi_eh_reset
,
989 .bios_param
= idescsi_bios
,
995 .use_clustering
= DISABLE_CLUSTERING
,
997 .proc_name
= "ide-scsi",
1000 static int ide_scsi_probe(ide_drive_t
*drive
)
1002 idescsi_scsi_t
*idescsi
;
1003 struct Scsi_Host
*host
;
1008 if (!warned
&& drive
->media
== ide_cdrom
) {
1009 printk(KERN_WARNING
"ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1013 if (idescsi_nocd
&& drive
->media
== ide_cdrom
)
1016 if (!strstr("ide-scsi", drive
->driver_req
) ||
1018 drive
->media
== ide_disk
||
1019 !(host
= scsi_host_alloc(&idescsi_template
,sizeof(idescsi_scsi_t
))))
1022 g
= alloc_disk(1 << PARTN_BITS
);
1026 ide_init_disk(g
, drive
);
1030 #if IDESCSI_DEBUG_LOG
1031 if (drive
->id
->last_lun
)
1032 printk(KERN_NOTICE
"%s: id->last_lun=%u\n", drive
->name
, drive
->id
->last_lun
);
1034 if ((drive
->id
->last_lun
& 0x7) != 7)
1035 host
->max_lun
= (drive
->id
->last_lun
& 0x7) + 1;
1039 drive
->driver_data
= host
;
1040 idescsi
= scsihost_to_idescsi(host
);
1041 idescsi
->drive
= drive
;
1042 idescsi
->driver
= &idescsi_driver
;
1043 idescsi
->host
= host
;
1045 g
->private_data
= &idescsi
->driver
;
1046 ide_proc_register_driver(drive
, &idescsi_driver
);
1048 idescsi_setup(drive
, idescsi
);
1049 g
->fops
= &idescsi_ops
;
1050 ide_register_region(g
);
1051 err
= scsi_add_host(host
, &drive
->gendev
);
1053 scsi_scan_host(host
);
1056 /* fall through on error */
1057 ide_unregister_region(g
);
1058 ide_proc_unregister_driver(drive
, &idescsi_driver
);
1062 scsi_host_put(host
);
1066 static int __init
init_idescsi_module(void)
1068 return driver_register(&idescsi_driver
.gen_driver
);
1071 static void __exit
exit_idescsi_module(void)
1073 driver_unregister(&idescsi_driver
.gen_driver
);
1076 module_param(idescsi_nocd
, int, 0600);
1077 MODULE_PARM_DESC(idescsi_nocd
, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1078 module_init(init_idescsi_module
);
1079 module_exit(exit_idescsi_module
);
1080 MODULE_LICENSE("GPL");