2 * Copyright (C) 1996-1999 Gadi Oxman <gadio@netvision.net.il>
3 * Copyright (C) 2004-2005 Bartlomiej Zolnierkiewicz
7 * Emulation of a SCSI host adapter for IDE ATAPI devices.
9 * With this driver, one can use the Linux SCSI drivers instead of the
10 * native IDE ATAPI drivers.
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
33 #define IDESCSI_VERSION "0.92"
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/string.h>
38 #include <linux/kernel.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>
47 #include <linux/delay.h>
48 #include <linux/mutex.h>
49 #include <linux/bitops.h>
52 #include <asm/uaccess.h>
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>
61 #define IDESCSI_DEBUG_LOG 0
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 unsigned int sg_cnt; /* Number of entries in sg */
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
156 * PIO data transfer routines using the scatter gather table.
158 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
164 count = min(pc->sg->length - pc->b_count, bcount);
165 if (PageHighMem(sg_page(pc->sg))) {
168 local_irq_save(flags);
169 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
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);
176 buf = sg_virt(pc->sg);
177 drive->hwif->atapi_input_bytes(drive,
178 buf + pc->b_count, count);
180 bcount -= count; pc->b_count += count;
181 if (pc->b_count == pc->sg->length) {
184 pc->sg = sg_next(pc->sg);
190 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
191 ide_atapi_discard_data(drive, bcount);
195 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
201 count = min(pc->sg->length - pc->b_count, bcount);
202 if (PageHighMem(sg_page(pc->sg))) {
205 local_irq_save(flags);
206 buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
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);
213 buf = sg_virt(pc->sg);
214 drive->hwif->atapi_output_bytes(drive,
215 buf + pc->b_count, count);
217 bcount -= count; pc->b_count += count;
218 if (pc->b_count == pc->sg->length) {
221 pc->sg = sg_next(pc->sg);
227 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
228 ide_atapi_write_zeros(drive, bcount);
232 static void ide_scsi_hex_dump(u8 *data, int len)
234 print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
237 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
239 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
244 /* stuff a sense request in front of our current request */
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) {
254 ide_init_drive_cmd(rq);
255 rq->special = (char *) pc;
258 pc->c[0] = REQUEST_SENSE;
259 pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
260 rq->cmd_type = REQ_TYPE_SENSE;
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);
267 ide_scsi_hex_dump(pc->c, 6);
269 rq->rq_disk = scsi->disk;
270 return ide_do_drive_cmd(drive, rq, ide_preempt);
273 static int idescsi_end_request(ide_drive_t *, int, int);
275 static ide_startstop_t
276 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
278 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
280 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
284 idescsi_end_request(drive, 0, 0);
289 static ide_startstop_t
290 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
292 #if IDESCSI_DEBUG_LOG
293 printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
294 ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
296 rq->errors |= ERROR_MAX;
298 idescsi_end_request(drive, 0, 0);
303 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
305 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
306 struct request *rq = HWGROUP(drive)->rq;
307 idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
308 int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
309 struct Scsi_Host *host;
310 int errors = rq->errors;
313 if (!blk_special_request(rq) && !blk_sense_request(rq)) {
314 ide_end_request(drive, uptodate, nrsecs);
317 ide_end_drive_cmd (drive, 0, 0);
318 if (blk_sense_request(rq)) {
319 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
321 printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
322 ide_scsi_hex_dump(pc->buffer, 16);
324 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
330 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
331 ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
332 } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
334 printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
335 drive->name, pc->scsi_cmd->serial_number);
336 pc->scsi_cmd->result = DID_TIME_OUT << 16;
337 } else if (errors >= ERROR_MAX) {
338 pc->scsi_cmd->result = DID_ERROR << 16;
340 printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
343 printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
344 if (!idescsi_check_condition(drive, rq))
345 /* we started a request sense, so we'll be back, exit for now */
347 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
349 pc->scsi_cmd->result = DID_OK << 16;
351 host = pc->scsi_cmd->device->host;
352 spin_lock_irqsave(host->host_lock, flags);
353 pc->done(pc->scsi_cmd);
354 spin_unlock_irqrestore(host->host_lock, flags);
361 static inline unsigned long get_timeout(idescsi_pc_t *pc)
363 return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
366 static int idescsi_expiry(ide_drive_t *drive)
368 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
369 idescsi_pc_t *pc = scsi->pc;
371 #if IDESCSI_DEBUG_LOG
372 printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
374 set_bit(PC_TIMEDOUT, &pc->flags);
376 return 0; /* we do not want the ide subsystem to retry */
380 * Our interrupt handler.
382 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
384 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
385 ide_hwif_t *hwif = drive->hwif;
386 idescsi_pc_t *pc = scsi->pc;
387 struct request *rq = pc->rq;
392 #if IDESCSI_DEBUG_LOG
393 printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
394 #endif /* IDESCSI_DEBUG_LOG */
396 if (test_bit(PC_TIMEDOUT, &pc->flags)){
397 #if IDESCSI_DEBUG_LOG
398 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
399 pc->scsi_cmd->serial_number, jiffies);
401 /* end this request now - scsi should retry it*/
402 idescsi_end_request (drive, 1, 0);
405 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
406 #if IDESCSI_DEBUG_LOG
407 printk ("ide-scsi: %s: DMA complete\n", drive->name);
408 #endif /* IDESCSI_DEBUG_LOG */
409 pc->actually_transferred=pc->request_transfer;
410 (void) HWIF(drive)->ide_dma_end(drive);
413 /* Clear the interrupt */
414 stat = ide_read_status(drive);
416 if ((stat & DRQ_STAT) == 0) {
417 /* No more interrupts */
418 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
419 printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
420 local_irq_enable_in_hardirq();
423 idescsi_end_request (drive, 1, 0);
426 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
427 hwif->INB(IDE_BCOUNTL_REG);
428 ireason = hwif->INB(IDE_IREASON_REG);
431 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
432 return ide_do_reset (drive);
435 temp = pc->actually_transferred + bcount;
436 if (temp > pc->request_transfer) {
437 if (temp > pc->buffer_size) {
438 printk(KERN_ERR "ide-scsi: The scsi wants to "
439 "send us more data than expected "
440 "- discarding data\n");
441 temp = pc->buffer_size - pc->actually_transferred;
443 clear_bit(PC_WRITING, &pc->flags);
445 idescsi_input_buffers(drive, pc, temp);
447 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
448 printk(KERN_ERR "ide-scsi: transferred"
452 pc->actually_transferred += temp;
453 pc->current_position += temp;
454 ide_atapi_discard_data(drive, bcount - temp);
455 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
458 #if IDESCSI_DEBUG_LOG
459 printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
460 #endif /* IDESCSI_DEBUG_LOG */
464 clear_bit(PC_WRITING, &pc->flags);
466 idescsi_input_buffers(drive, pc, bcount);
468 hwif->atapi_input_bytes(drive, pc->current_position,
471 set_bit(PC_WRITING, &pc->flags);
473 idescsi_output_buffers(drive, pc, bcount);
475 hwif->atapi_output_bytes(drive, pc->current_position,
478 /* Update the current position */
479 pc->actually_transferred += bcount;
480 pc->current_position += bcount;
482 /* And set the interrupt handler again */
483 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
487 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
489 ide_hwif_t *hwif = drive->hwif;
490 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
491 idescsi_pc_t *pc = scsi->pc;
492 ide_startstop_t startstop;
495 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
496 printk(KERN_ERR "ide-scsi: Strange, packet command "
497 "initiated yet DRQ isn't asserted\n");
500 ireason = hwif->INB(IDE_IREASON_REG);
501 if ((ireason & CD) == 0 || (ireason & IO)) {
502 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
503 "issuing a packet command\n");
504 return ide_do_reset (drive);
506 BUG_ON(HWGROUP(drive)->handler != NULL);
507 /* Set the interrupt routine */
508 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
509 /* Send the actual packet */
510 drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
511 if (test_bit (PC_DMA_OK, &pc->flags)) {
512 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
513 hwif->dma_start(drive);
518 static inline int idescsi_set_direction(idescsi_pc_t *pc)
521 case READ_6: case READ_10: case READ_12:
522 clear_bit(PC_WRITING, &pc->flags);
524 case WRITE_6: case WRITE_10: case WRITE_12:
525 set_bit(PC_WRITING, &pc->flags);
532 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
534 ide_hwif_t *hwif = drive->hwif;
535 struct scatterlist *sg, *scsi_sg;
538 if (!pc->request_transfer || pc->request_transfer % 1024)
541 if (idescsi_set_direction(pc))
545 scsi_sg = scsi_sglist(pc->scsi_cmd);
546 segments = scsi_sg_count(pc->scsi_cmd);
548 if (segments > hwif->sg_max_nents)
551 hwif->sg_nents = segments;
552 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
558 * Issue a packet command
560 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
562 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
563 ide_hwif_t *hwif = drive->hwif;
567 scsi->pc=pc; /* Set the current packet command */
568 pc->actually_transferred=0; /* We haven't transferred any data yet */
569 pc->current_position=pc->buffer;
570 /* Request to transfer the entire buffer at once */
571 bcount = min(pc->request_transfer, 63 * 1024);
573 if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
575 dma = !hwif->dma_setup(drive);
579 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
582 set_bit(PC_DMA_OK, &pc->flags);
584 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
585 ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
586 get_timeout(pc), idescsi_expiry);
589 /* Issue the packet command */
590 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
591 return idescsi_transfer_pc(drive);
596 * idescsi_do_request is our request handling function.
598 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
600 #if IDESCSI_DEBUG_LOG
601 printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
602 printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
603 #endif /* IDESCSI_DEBUG_LOG */
605 if (blk_sense_request(rq) || blk_special_request(rq)) {
606 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
608 blk_dump_rq_flags(rq, "ide-scsi: unsup command");
609 idescsi_end_request (drive, 0, 0);
613 #ifdef CONFIG_IDE_PROC_FS
614 static void idescsi_add_settings(ide_drive_t *drive)
616 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
619 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
621 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
622 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
623 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
624 ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
625 ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
628 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
632 * Driver initialization.
634 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
636 if (drive->id && (drive->id->config & 0x0060) == 0x20)
637 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
638 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
639 #if IDESCSI_DEBUG_LOG
640 set_bit(IDESCSI_LOG_CMD, &scsi->log);
641 #endif /* IDESCSI_DEBUG_LOG */
642 idescsi_add_settings(drive);
645 static void ide_scsi_remove(ide_drive_t *drive)
647 struct Scsi_Host *scsihost = drive->driver_data;
648 struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
649 struct gendisk *g = scsi->disk;
651 scsi_remove_host(scsihost);
652 ide_proc_unregister_driver(drive, scsi->driver);
654 ide_unregister_region(g);
656 drive->driver_data = NULL;
657 g->private_data = NULL;
663 static int ide_scsi_probe(ide_drive_t *);
665 #ifdef CONFIG_IDE_PROC_FS
666 static ide_proc_entry_t idescsi_proc[] = {
667 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
668 { NULL, 0, NULL, NULL }
672 static ide_driver_t idescsi_driver = {
674 .owner = THIS_MODULE,
676 .bus = &ide_bus_type,
678 .probe = ide_scsi_probe,
679 .remove = ide_scsi_remove,
680 .version = IDESCSI_VERSION,
682 .supports_dsc_overlap = 0,
683 .do_request = idescsi_do_request,
684 .end_request = idescsi_end_request,
685 .error = idescsi_atapi_error,
686 .abort = idescsi_atapi_abort,
687 #ifdef CONFIG_IDE_PROC_FS
688 .proc = idescsi_proc,
692 static int idescsi_ide_open(struct inode *inode, struct file *filp)
694 struct gendisk *disk = inode->i_bdev->bd_disk;
695 struct ide_scsi_obj *scsi;
697 if (!(scsi = ide_scsi_get(disk)))
703 static int idescsi_ide_release(struct inode *inode, struct file *filp)
705 struct gendisk *disk = inode->i_bdev->bd_disk;
706 struct ide_scsi_obj *scsi = ide_scsi_g(disk);
713 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
714 unsigned int cmd, unsigned long arg)
716 struct block_device *bdev = inode->i_bdev;
717 struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
718 return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
721 static struct block_device_operations idescsi_ops = {
722 .owner = THIS_MODULE,
723 .open = idescsi_ide_open,
724 .release = idescsi_ide_release,
725 .ioctl = idescsi_ide_ioctl,
728 static int idescsi_slave_configure(struct scsi_device * sdp)
730 /* Configure detected device */
731 sdp->use_10_for_rw = 1;
732 sdp->use_10_for_ms = 1;
733 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
737 static const char *idescsi_info (struct Scsi_Host *host)
739 return "SCSI host adapter emulation for IDE ATAPI devices";
742 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
744 idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
746 if (cmd == SG_SET_TRANSFORM) {
748 set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
750 clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
752 } else if (cmd == SG_GET_TRANSFORM)
753 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
757 static int idescsi_queue (struct scsi_cmnd *cmd,
758 void (*done)(struct scsi_cmnd *))
760 struct Scsi_Host *host = cmd->device->host;
761 idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
762 ide_drive_t *drive = scsi->drive;
763 struct request *rq = NULL;
764 idescsi_pc_t *pc = NULL;
767 scmd_printk (KERN_ERR, cmd, "drive not present\n");
770 scsi = drive_to_idescsi(drive);
771 pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
772 rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
773 if (rq == NULL || pc == NULL) {
774 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
778 memset (pc->c, 0, 12);
781 memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
783 pc->sg = scsi_sglist(cmd);
784 pc->sg_cnt = scsi_sg_count(cmd);
786 pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
789 pc->timeout = jiffies + cmd->timeout_per_command;
791 if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
792 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
793 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
794 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
795 printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
796 ide_scsi_hex_dump(pc->c, 12);
800 ide_init_drive_cmd (rq);
801 rq->special = (char *) pc;
802 rq->cmd_type = REQ_TYPE_SPECIAL;
803 spin_unlock_irq(host->host_lock);
804 rq->rq_disk = scsi->disk;
805 (void) ide_do_drive_cmd (drive, rq, ide_end);
806 spin_lock_irq(host->host_lock);
811 cmd->result = DID_ERROR << 16;
816 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
818 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
819 ide_drive_t *drive = scsi->drive;
823 /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
825 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
826 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
829 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
834 /* First give it some more time, how much is "right" is hard to say :-( */
836 busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
837 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
838 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
840 spin_lock_irq(&ide_lock);
842 /* If there is no pc running we're done (our interrupt took care of it) */
848 /* It's somewhere in flight. Does ide subsystem agree? */
849 if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
850 elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
852 * FIXME - not sure this condition can ever occur
854 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
856 if (blk_sense_request(scsi->pc->rq))
857 kfree(scsi->pc->buffer);
866 spin_unlock_irq(&ide_lock);
868 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
869 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
874 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
877 idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
878 ide_drive_t *drive = scsi->drive;
882 /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
884 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
885 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
888 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
893 spin_lock_irq(cmd->device->host->host_lock);
894 spin_lock(&ide_lock);
896 if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
897 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
898 spin_unlock(&ide_lock);
899 spin_unlock_irq(cmd->device->host->host_lock);
903 /* kill current request */
904 if (__blk_end_request(req, -EIO, 0))
906 if (blk_sense_request(req))
907 kfree(scsi->pc->buffer);
912 /* now nuke the drive queue */
913 while ((req = elv_next_request(drive->queue))) {
914 if (__blk_end_request(req, -EIO, 0))
918 HWGROUP(drive)->rq = NULL;
919 HWGROUP(drive)->handler = NULL;
920 HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
921 spin_unlock(&ide_lock);
925 /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
928 spin_unlock_irq(cmd->device->host->host_lock);
930 spin_lock_irq(cmd->device->host->host_lock);
931 } while ( HWGROUP(drive)->handler );
933 ready = drive_is_ready(drive);
934 HWGROUP(drive)->busy--;
936 printk (KERN_ERR "ide-scsi: reset failed!\n");
940 spin_unlock_irq(cmd->device->host->host_lock);
944 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
945 sector_t capacity, int *parm)
947 idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
948 ide_drive_t *drive = idescsi->drive;
950 if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
951 parm[0] = drive->bios_head;
952 parm[1] = drive->bios_sect;
953 parm[2] = drive->bios_cyl;
958 static struct scsi_host_template idescsi_template = {
959 .module = THIS_MODULE,
961 .info = idescsi_info,
962 .slave_configure = idescsi_slave_configure,
963 .ioctl = idescsi_ioctl,
964 .queuecommand = idescsi_queue,
965 .eh_abort_handler = idescsi_eh_abort,
966 .eh_host_reset_handler = idescsi_eh_reset,
967 .bios_param = idescsi_bios,
973 .use_clustering = DISABLE_CLUSTERING,
975 .proc_name = "ide-scsi",
978 static int ide_scsi_probe(ide_drive_t *drive)
980 idescsi_scsi_t *idescsi;
981 struct Scsi_Host *host;
986 if (!warned && drive->media == ide_cdrom) {
987 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
991 if (idescsi_nocd && drive->media == ide_cdrom)
994 if (!strstr("ide-scsi", drive->driver_req) ||
996 drive->media == ide_disk ||
997 !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1000 g = alloc_disk(1 << PARTN_BITS);
1004 ide_init_disk(g, drive);
1008 #if IDESCSI_DEBUG_LOG
1009 if (drive->id->last_lun)
1010 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1012 if ((drive->id->last_lun & 0x7) != 7)
1013 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1017 drive->driver_data = host;
1018 idescsi = scsihost_to_idescsi(host);
1019 idescsi->drive = drive;
1020 idescsi->driver = &idescsi_driver;
1021 idescsi->host = host;
1023 g->private_data = &idescsi->driver;
1024 ide_proc_register_driver(drive, &idescsi_driver);
1026 idescsi_setup(drive, idescsi);
1027 g->fops = &idescsi_ops;
1028 ide_register_region(g);
1029 err = scsi_add_host(host, &drive->gendev);
1031 scsi_scan_host(host);
1034 /* fall through on error */
1035 ide_unregister_region(g);
1036 ide_proc_unregister_driver(drive, &idescsi_driver);
1040 scsi_host_put(host);
1044 static int __init init_idescsi_module(void)
1046 return driver_register(&idescsi_driver.gen_driver);
1049 static void __exit exit_idescsi_module(void)
1051 driver_unregister(&idescsi_driver.gen_driver);
1054 module_param(idescsi_nocd, int, 0600);
1055 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1056 module_init(init_idescsi_module);
1057 module_exit(exit_idescsi_module);
1058 MODULE_LICENSE("GPL");