[PARPORT] Kill useful 'irq' arg from parport_{generic_irq,ieee1284_interrupt}
[linux-2.6] / drivers / scsi / ide-scsi.c
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/types.h>
38 #include <linux/string.h>
39 #include <linux/kernel.h>
40 #include <linux/mm.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>
50 #include <linux/bitops.h>
51
52 #include <asm/io.h>
53 #include <asm/uaccess.h>
54
55 #include <scsi/scsi.h>
56 #include <scsi/scsi_cmnd.h>
57 #include <scsi/scsi_device.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_tcq.h>
60 #include <scsi/sg.h>
61
62 #define IDESCSI_DEBUG_LOG               0
63
64 typedef struct idescsi_pc_s {
65         u8 c[12];                               /* Actual packet bytes */
66         int request_transfer;                   /* Bytes to transfer */
67         int actually_transferred;               /* Bytes actually transferred */
68         int buffer_size;                        /* Size of our data buffer */
69         struct request *rq;                     /* The corresponding request */
70         u8 *buffer;                             /* Data buffer */
71         u8 *current_position;                   /* Pointer into the above buffer */
72         struct scatterlist *sg;                 /* Scatter gather table */
73         unsigned int sg_cnt;                    /* Number of entries in sg */
74         int b_count;                            /* Bytes transferred from current entry */
75         struct scsi_cmnd *scsi_cmd;             /* SCSI command */
76         void (*done)(struct scsi_cmnd *);       /* Scsi completion routine */
77         unsigned long flags;                    /* Status/Action flags */
78         unsigned long timeout;                  /* Command timeout */
79 } idescsi_pc_t;
80
81 /*
82  *      Packet command status bits.
83  */
84 #define PC_DMA_IN_PROGRESS              0       /* 1 while DMA in progress */
85 #define PC_WRITING                      1       /* Data direction */
86 #define PC_TIMEDOUT                     3       /* command timed out */
87 #define PC_DMA_OK                       4       /* Use DMA */
88
89 /*
90  *      SCSI command transformation layer
91  */
92 #define IDESCSI_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 DEFINE_MUTEX(idescsi_ref_mutex);
112 static int idescsi_nocd;                        /* Set by module param to skip cd */
113
114 #define ide_scsi_g(disk) \
115         container_of((disk)->private_data, struct ide_scsi_obj, driver)
116
117 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
118 {
119         struct ide_scsi_obj *scsi = NULL;
120
121         mutex_lock(&idescsi_ref_mutex);
122         scsi = ide_scsi_g(disk);
123         if (scsi)
124                 scsi_host_get(scsi->host);
125         mutex_unlock(&idescsi_ref_mutex);
126         return scsi;
127 }
128
129 static void ide_scsi_put(struct ide_scsi_obj *scsi)
130 {
131         mutex_lock(&idescsi_ref_mutex);
132         scsi_host_put(scsi->host);
133         mutex_unlock(&idescsi_ref_mutex);
134 }
135
136 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
137 {
138         return (idescsi_scsi_t*) (&host[1]);
139 }
140
141 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
142 {
143         return scsihost_to_idescsi(ide_drive->driver_data);
144 }
145
146 /*
147  *      Per ATAPI device status bits.
148  */
149 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
150
151 /*
152  *      ide-scsi requests.
153  */
154 #define IDESCSI_PC_RQ                   90
155
156 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
157 {
158         while (bcount--)
159                 (void) HWIF(drive)->INB(IDE_DATA_REG);
160 }
161
162 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
163 {
164         while (bcount--)
165                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
166 }
167
168 /*
169  *      PIO data transfer routines using the scatter gather table.
170  */
171 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
172 {
173         int count;
174         char *buf;
175
176         while (bcount) {
177                 count = min(pc->sg->length - pc->b_count, bcount);
178                 if (PageHighMem(sg_page(pc->sg))) {
179                         unsigned long flags;
180
181                         local_irq_save(flags);
182                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
183                                         pc->sg->offset;
184                         drive->hwif->atapi_input_bytes(drive,
185                                                 buf + pc->b_count, count);
186                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
187                         local_irq_restore(flags);
188                 } else {
189                         buf = sg_virt(pc->sg);
190                         drive->hwif->atapi_input_bytes(drive,
191                                                 buf + pc->b_count, count);
192                 }
193                 bcount -= count; pc->b_count += count;
194                 if (pc->b_count == pc->sg->length) {
195                         if (!--pc->sg_cnt)
196                                 break;
197                         pc->sg = sg_next(pc->sg);
198                         pc->b_count = 0;
199                 }
200         }
201
202         if (bcount) {
203                 printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
204                 idescsi_discard_data (drive, bcount);
205         }
206 }
207
208 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
209 {
210         int count;
211         char *buf;
212
213         while (bcount) {
214                 count = min(pc->sg->length - pc->b_count, bcount);
215                 if (PageHighMem(sg_page(pc->sg))) {
216                         unsigned long flags;
217
218                         local_irq_save(flags);
219                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
220                                                 pc->sg->offset;
221                         drive->hwif->atapi_output_bytes(drive,
222                                                 buf + pc->b_count, count);
223                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
224                         local_irq_restore(flags);
225                 } else {
226                         buf = sg_virt(pc->sg);
227                         drive->hwif->atapi_output_bytes(drive,
228                                                 buf + pc->b_count, count);
229                 }
230                 bcount -= count; pc->b_count += count;
231                 if (pc->b_count == pc->sg->length) {
232                         if (!--pc->sg_cnt)
233                                 break;
234                         pc->sg = sg_next(pc->sg);
235                         pc->b_count = 0;
236                 }
237         }
238
239         if (bcount) {
240                 printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
241                 idescsi_output_zeros (drive, bcount);
242         }
243 }
244
245 static void hexdump(u8 *x, int len)
246 {
247         int i;
248
249         printk("[ ");
250         for (i = 0; i < len; i++)
251                 printk("%x ", x[i]);
252         printk("]\n");
253 }
254
255 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
256 {
257         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
258         idescsi_pc_t   *pc;
259         struct request *rq;
260         u8             *buf;
261
262         /* stuff a sense request in front of our current request */
263         pc = kzalloc(sizeof(idescsi_pc_t), GFP_ATOMIC);
264         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
265         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
266         if (!pc || !rq || !buf) {
267                 kfree(buf);
268                 kfree(rq);
269                 kfree(pc);
270                 return -ENOMEM;
271         }
272         ide_init_drive_cmd(rq);
273         rq->special = (char *) pc;
274         pc->rq = rq;
275         pc->buffer = buf;
276         pc->c[0] = REQUEST_SENSE;
277         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
278         rq->cmd_type = REQ_TYPE_SENSE;
279         pc->timeout = jiffies + WAIT_READY;
280         /* NOTE! Save the failed packet command in "rq->buffer" */
281         rq->buffer = (void *) failed_command->special;
282         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
283         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
284                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
285                 hexdump(pc->c, 6);
286         }
287         rq->rq_disk = scsi->disk;
288         return ide_do_drive_cmd(drive, rq, ide_preempt);
289 }
290
291 static int idescsi_end_request(ide_drive_t *, int, int);
292
293 static ide_startstop_t
294 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
295 {
296         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
297                 /* force an abort */
298                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
299
300         rq->errors++;
301
302         idescsi_end_request(drive, 0, 0);
303
304         return ide_stopped;
305 }
306
307 static ide_startstop_t
308 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
309 {
310 #if IDESCSI_DEBUG_LOG
311         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
312                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
313 #endif
314         rq->errors |= ERROR_MAX;
315
316         idescsi_end_request(drive, 0, 0);
317
318         return ide_stopped;
319 }
320
321 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
322 {
323         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
324         struct request *rq = HWGROUP(drive)->rq;
325         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
326         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
327         struct Scsi_Host *host;
328         int errors = rq->errors;
329         unsigned long flags;
330
331         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
332                 ide_end_request(drive, uptodate, nrsecs);
333                 return 0;
334         }
335         ide_end_drive_cmd (drive, 0, 0);
336         if (blk_sense_request(rq)) {
337                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
338                 if (log) {
339                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
340                         hexdump(pc->buffer,16);
341                 }
342                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
343                 kfree(pc->buffer);
344                 kfree(pc);
345                 kfree(rq);
346                 pc = opc;
347                 rq = pc->rq;
348                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
349                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
350         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
351                 if (log)
352                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
353                                         drive->name, pc->scsi_cmd->serial_number);
354                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
355         } else if (errors >= ERROR_MAX) {
356                 pc->scsi_cmd->result = DID_ERROR << 16;
357                 if (log)
358                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
359         } else if (errors) {
360                 if (log)
361                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
362                 if (!idescsi_check_condition(drive, rq))
363                         /* we started a request sense, so we'll be back, exit for now */
364                         return 0;
365                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
366         } else {
367                 pc->scsi_cmd->result = DID_OK << 16;
368         }
369         host = pc->scsi_cmd->device->host;
370         spin_lock_irqsave(host->host_lock, flags);
371         pc->done(pc->scsi_cmd);
372         spin_unlock_irqrestore(host->host_lock, flags);
373         kfree(pc);
374         kfree(rq);
375         scsi->pc = NULL;
376         return 0;
377 }
378
379 static inline unsigned long get_timeout(idescsi_pc_t *pc)
380 {
381         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
382 }
383
384 static int idescsi_expiry(ide_drive_t *drive)
385 {
386         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
387         idescsi_pc_t   *pc   = scsi->pc;
388
389 #if IDESCSI_DEBUG_LOG
390         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
391 #endif
392         set_bit(PC_TIMEDOUT, &pc->flags);
393
394         return 0;                                       /* we do not want the ide subsystem to retry */
395 }
396
397 /*
398  *      Our interrupt handler.
399  */
400 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
401 {
402         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
403         idescsi_pc_t *pc=scsi->pc;
404         struct request *rq = pc->rq;
405         atapi_bcount_t bcount;
406         atapi_status_t status;
407         atapi_ireason_t ireason;
408         atapi_feature_t feature;
409
410         unsigned int temp;
411
412 #if IDESCSI_DEBUG_LOG
413         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
414 #endif /* IDESCSI_DEBUG_LOG */
415
416         if (test_bit(PC_TIMEDOUT, &pc->flags)){
417 #if IDESCSI_DEBUG_LOG
418                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
419                                 pc->scsi_cmd->serial_number, jiffies);
420 #endif
421                 /* end this request now - scsi should retry it*/
422                 idescsi_end_request (drive, 1, 0);
423                 return ide_stopped;
424         }
425         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
426 #if IDESCSI_DEBUG_LOG
427                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
428 #endif /* IDESCSI_DEBUG_LOG */
429                 pc->actually_transferred=pc->request_transfer;
430                 (void) HWIF(drive)->ide_dma_end(drive);
431         }
432
433         feature.all = 0;
434         /* Clear the interrupt */
435         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
436
437         if (!status.b.drq) {
438                 /* No more interrupts */
439                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
440                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
441                 local_irq_enable_in_hardirq();
442                 if (status.b.check)
443                         rq->errors++;
444                 idescsi_end_request (drive, 1, 0);
445                 return ide_stopped;
446         }
447         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
448         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
449         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
450
451         if (ireason.b.cod) {
452                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
453                 return ide_do_reset (drive);
454         }
455         if (ireason.b.io) {
456                 temp = pc->actually_transferred + bcount.all;
457                 if (temp > pc->request_transfer) {
458                         if (temp > pc->buffer_size) {
459                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
460                                         "send us more data than expected "
461                                         "- discarding data\n");
462                                 temp = pc->buffer_size - pc->actually_transferred;
463                                 if (temp) {
464                                         clear_bit(PC_WRITING, &pc->flags);
465                                         if (pc->sg)
466                                                 idescsi_input_buffers(drive, pc, temp);
467                                         else
468                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
469                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
470                                 }
471                                 pc->actually_transferred += temp;
472                                 pc->current_position += temp;
473                                 idescsi_discard_data(drive, bcount.all - temp);
474                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
475                                 return ide_started;
476                         }
477 #if IDESCSI_DEBUG_LOG
478                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
479 #endif /* IDESCSI_DEBUG_LOG */
480                 }
481         }
482         if (ireason.b.io) {
483                 clear_bit(PC_WRITING, &pc->flags);
484                 if (pc->sg)
485                         idescsi_input_buffers(drive, pc, bcount.all);
486                 else
487                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
488         } else {
489                 set_bit(PC_WRITING, &pc->flags);
490                 if (pc->sg)
491                         idescsi_output_buffers (drive, pc, bcount.all);
492                 else
493                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
494         }
495         /* Update the current position */
496         pc->actually_transferred += bcount.all;
497         pc->current_position += bcount.all;
498
499         /* And set the interrupt handler again */
500         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
501         return ide_started;
502 }
503
504 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
505 {
506         ide_hwif_t *hwif = drive->hwif;
507         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
508         idescsi_pc_t *pc = scsi->pc;
509         atapi_ireason_t ireason;
510         ide_startstop_t startstop;
511
512         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
513                 printk(KERN_ERR "ide-scsi: Strange, packet command "
514                         "initiated yet DRQ isn't asserted\n");
515                 return startstop;
516         }
517         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
518         if (!ireason.b.cod || ireason.b.io) {
519                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
520                                 "issuing a packet command\n");
521                 return ide_do_reset (drive);
522         }
523         BUG_ON(HWGROUP(drive)->handler != NULL);
524         /* Set the interrupt routine */
525         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
526         /* Send the actual packet */
527         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
528         if (test_bit (PC_DMA_OK, &pc->flags)) {
529                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
530                 hwif->dma_start(drive);
531         }
532         return ide_started;
533 }
534
535 static inline int idescsi_set_direction(idescsi_pc_t *pc)
536 {
537         switch (pc->c[0]) {
538                 case READ_6: case READ_10: case READ_12:
539                         clear_bit(PC_WRITING, &pc->flags);
540                         return 0;
541                 case WRITE_6: case WRITE_10: case WRITE_12:
542                         set_bit(PC_WRITING, &pc->flags);
543                         return 0;
544                 default:
545                         return 1;
546         }
547 }
548
549 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
550 {
551         ide_hwif_t *hwif = drive->hwif;
552         struct scatterlist *sg, *scsi_sg;
553         int segments;
554
555         if (!pc->request_transfer || pc->request_transfer % 1024)
556                 return 1;
557
558         if (idescsi_set_direction(pc))
559                 return 1;
560
561         sg = hwif->sg_table;
562         scsi_sg = scsi_sglist(pc->scsi_cmd);
563         segments = scsi_sg_count(pc->scsi_cmd);
564
565         if (segments > hwif->sg_max_nents)
566                 return 1;
567
568         hwif->sg_nents = segments;
569         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
570
571         return 0;
572 }
573
574 /*
575  *      Issue a packet command
576  */
577 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
578 {
579         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
580         ide_hwif_t *hwif = drive->hwif;
581         atapi_feature_t feature;
582         atapi_bcount_t bcount;
583
584         scsi->pc=pc;                                                    /* Set the current packet command */
585         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
586         pc->current_position=pc->buffer;
587         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
588
589         feature.all = 0;
590         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
591                 hwif->sg_mapped = 1;
592                 feature.b.dma = !hwif->dma_setup(drive);
593                 hwif->sg_mapped = 0;
594         }
595
596         SELECT_DRIVE(drive);
597         if (IDE_CONTROL_REG)
598                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
599
600         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
601         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
602         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
603
604         if (feature.b.dma)
605                 set_bit(PC_DMA_OK, &pc->flags);
606
607         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
608                 BUG_ON(HWGROUP(drive)->handler != NULL);
609                 ide_set_handler(drive, &idescsi_transfer_pc,
610                                 get_timeout(pc), idescsi_expiry);
611                 /* Issue the packet command */
612                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
613                 return ide_started;
614         } else {
615                 /* Issue the packet command */
616                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
617                 return idescsi_transfer_pc(drive);
618         }
619 }
620
621 /*
622  *      idescsi_do_request is our request handling function.
623  */
624 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
625 {
626 #if IDESCSI_DEBUG_LOG
627         printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
628         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
629 #endif /* IDESCSI_DEBUG_LOG */
630
631         if (blk_sense_request(rq) || blk_special_request(rq)) {
632                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
633         }
634         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
635         idescsi_end_request (drive, 0, 0);
636         return ide_stopped;
637 }
638
639 #ifdef CONFIG_IDE_PROC_FS
640 static void idescsi_add_settings(ide_drive_t *drive)
641 {
642         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
643
644 /*
645  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
646  */
647         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
648         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
649         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
650         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
651         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
652 }
653 #else
654 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
655 #endif
656
657 /*
658  *      Driver initialization.
659  */
660 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
661 {
662         if (drive->id && (drive->id->config & 0x0060) == 0x20)
663                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
664         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
665 #if IDESCSI_DEBUG_LOG
666         set_bit(IDESCSI_LOG_CMD, &scsi->log);
667 #endif /* IDESCSI_DEBUG_LOG */
668         idescsi_add_settings(drive);
669 }
670
671 static void ide_scsi_remove(ide_drive_t *drive)
672 {
673         struct Scsi_Host *scsihost = drive->driver_data;
674         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
675         struct gendisk *g = scsi->disk;
676
677         scsi_remove_host(scsihost);
678         ide_proc_unregister_driver(drive, scsi->driver);
679
680         ide_unregister_region(g);
681
682         drive->driver_data = NULL;
683         g->private_data = NULL;
684         put_disk(g);
685
686         ide_scsi_put(scsi);
687 }
688
689 static int ide_scsi_probe(ide_drive_t *);
690
691 #ifdef CONFIG_IDE_PROC_FS
692 static ide_proc_entry_t idescsi_proc[] = {
693         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
694         { NULL, 0, NULL, NULL }
695 };
696 #endif
697
698 static ide_driver_t idescsi_driver = {
699         .gen_driver = {
700                 .owner          = THIS_MODULE,
701                 .name           = "ide-scsi",
702                 .bus            = &ide_bus_type,
703         },
704         .probe                  = ide_scsi_probe,
705         .remove                 = ide_scsi_remove,
706         .version                = IDESCSI_VERSION,
707         .media                  = ide_scsi,
708         .supports_dsc_overlap   = 0,
709         .do_request             = idescsi_do_request,
710         .end_request            = idescsi_end_request,
711         .error                  = idescsi_atapi_error,
712         .abort                  = idescsi_atapi_abort,
713 #ifdef CONFIG_IDE_PROC_FS
714         .proc                   = idescsi_proc,
715 #endif
716 };
717
718 static int idescsi_ide_open(struct inode *inode, struct file *filp)
719 {
720         struct gendisk *disk = inode->i_bdev->bd_disk;
721         struct ide_scsi_obj *scsi;
722
723         if (!(scsi = ide_scsi_get(disk)))
724                 return -ENXIO;
725
726         return 0;
727 }
728
729 static int idescsi_ide_release(struct inode *inode, struct file *filp)
730 {
731         struct gendisk *disk = inode->i_bdev->bd_disk;
732         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
733
734         ide_scsi_put(scsi);
735
736         return 0;
737 }
738
739 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
740                         unsigned int cmd, unsigned long arg)
741 {
742         struct block_device *bdev = inode->i_bdev;
743         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
744         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
745 }
746
747 static struct block_device_operations idescsi_ops = {
748         .owner          = THIS_MODULE,
749         .open           = idescsi_ide_open,
750         .release        = idescsi_ide_release,
751         .ioctl          = idescsi_ide_ioctl,
752 };
753
754 static int idescsi_slave_configure(struct scsi_device * sdp)
755 {
756         /* Configure detected device */
757         sdp->use_10_for_rw = 1;
758         sdp->use_10_for_ms = 1;
759         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
760         return 0;
761 }
762
763 static const char *idescsi_info (struct Scsi_Host *host)
764 {
765         return "SCSI host adapter emulation for IDE ATAPI devices";
766 }
767
768 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
769 {
770         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
771
772         if (cmd == SG_SET_TRANSFORM) {
773                 if (arg)
774                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
775                 else
776                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
777                 return 0;
778         } else if (cmd == SG_GET_TRANSFORM)
779                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
780         return -EINVAL;
781 }
782
783 static int idescsi_queue (struct scsi_cmnd *cmd,
784                 void (*done)(struct scsi_cmnd *))
785 {
786         struct Scsi_Host *host = cmd->device->host;
787         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
788         ide_drive_t *drive = scsi->drive;
789         struct request *rq = NULL;
790         idescsi_pc_t *pc = NULL;
791
792         if (!drive) {
793                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
794                 goto abort;
795         }
796         scsi = drive_to_idescsi(drive);
797         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
798         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
799         if (rq == NULL || pc == NULL) {
800                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
801                 goto abort;
802         }
803
804         memset (pc->c, 0, 12);
805         pc->flags = 0;
806         pc->rq = rq;
807         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
808         pc->buffer = NULL;
809         pc->sg = scsi_sglist(cmd);
810         pc->sg_cnt = scsi_sg_count(cmd);
811         pc->b_count = 0;
812         pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
813         pc->scsi_cmd = cmd;
814         pc->done = done;
815         pc->timeout = jiffies + cmd->timeout_per_command;
816
817         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
818                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
819                 hexdump(cmd->cmnd, cmd->cmd_len);
820                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
821                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
822                         hexdump(pc->c, 12);
823                 }
824         }
825
826         ide_init_drive_cmd (rq);
827         rq->special = (char *) pc;
828         rq->cmd_type = REQ_TYPE_SPECIAL;
829         spin_unlock_irq(host->host_lock);
830         rq->rq_disk = scsi->disk;
831         (void) ide_do_drive_cmd (drive, rq, ide_end);
832         spin_lock_irq(host->host_lock);
833         return 0;
834 abort:
835         kfree (pc);
836         kfree (rq);
837         cmd->result = DID_ERROR << 16;
838         done(cmd);
839         return 0;
840 }
841
842 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
843 {
844         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
845         ide_drive_t    *drive = scsi->drive;
846         int             busy;
847         int             ret   = FAILED;
848
849         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
850
851         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
852                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
853
854         if (!drive) {
855                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
856                 WARN_ON(1);
857                 goto no_drive;
858         }
859
860         /* First give it some more time, how much is "right" is hard to say :-( */
861
862         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
863         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
864                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
865
866         spin_lock_irq(&ide_lock);
867
868         /* If there is no pc running we're done (our interrupt took care of it) */
869         if (!scsi->pc) {
870                 ret = SUCCESS;
871                 goto ide_unlock;
872         }
873
874         /* It's somewhere in flight. Does ide subsystem agree? */
875         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
876             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
877                 /*
878                  * FIXME - not sure this condition can ever occur
879                  */
880                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
881
882                 if (blk_sense_request(scsi->pc->rq))
883                         kfree(scsi->pc->buffer);
884                 kfree(scsi->pc->rq);
885                 kfree(scsi->pc);
886                 scsi->pc = NULL;
887
888                 ret = SUCCESS;
889         }
890
891 ide_unlock:
892         spin_unlock_irq(&ide_lock);
893 no_drive:
894         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
895                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
896
897         return ret;
898 }
899
900 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
901 {
902         struct request *req;
903         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
904         ide_drive_t    *drive = scsi->drive;
905         int             ready = 0;
906         int             ret   = SUCCESS;
907
908         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
909
910         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
911                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
912
913         if (!drive) {
914                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
915                 WARN_ON(1);
916                 return FAILED;
917         }
918
919         spin_lock_irq(cmd->device->host->host_lock);
920         spin_lock(&ide_lock);
921
922         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
923                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
924                 spin_unlock(&ide_lock);
925                 spin_unlock_irq(cmd->device->host->host_lock);
926                 return FAILED;
927         }
928
929         /* kill current request */
930         blkdev_dequeue_request(req);
931         end_that_request_last(req, 0);
932         if (blk_sense_request(req))
933                 kfree(scsi->pc->buffer);
934         kfree(scsi->pc);
935         scsi->pc = NULL;
936         kfree(req);
937
938         /* now nuke the drive queue */
939         while ((req = elv_next_request(drive->queue))) {
940                 blkdev_dequeue_request(req);
941                 end_that_request_last(req, 0);
942         }
943
944         HWGROUP(drive)->rq = NULL;
945         HWGROUP(drive)->handler = NULL;
946         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
947         spin_unlock(&ide_lock);
948
949         ide_do_reset(drive);
950
951         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
952
953         do {
954                 spin_unlock_irq(cmd->device->host->host_lock);
955                 msleep(50);
956                 spin_lock_irq(cmd->device->host->host_lock);
957         } while ( HWGROUP(drive)->handler );
958
959         ready = drive_is_ready(drive);
960         HWGROUP(drive)->busy--;
961         if (!ready) {
962                 printk (KERN_ERR "ide-scsi: reset failed!\n");
963                 ret = FAILED;
964         }
965
966         spin_unlock_irq(cmd->device->host->host_lock);
967         return ret;
968 }
969
970 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
971                 sector_t capacity, int *parm)
972 {
973         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
974         ide_drive_t *drive = idescsi->drive;
975
976         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
977                 parm[0] = drive->bios_head;
978                 parm[1] = drive->bios_sect;
979                 parm[2] = drive->bios_cyl;
980         }
981         return 0;
982 }
983
984 static struct scsi_host_template idescsi_template = {
985         .module                 = THIS_MODULE,
986         .name                   = "idescsi",
987         .info                   = idescsi_info,
988         .slave_configure        = idescsi_slave_configure,
989         .ioctl                  = idescsi_ioctl,
990         .queuecommand           = idescsi_queue,
991         .eh_abort_handler       = idescsi_eh_abort,
992         .eh_host_reset_handler  = idescsi_eh_reset,
993         .bios_param             = idescsi_bios,
994         .can_queue              = 40,
995         .this_id                = -1,
996         .sg_tablesize           = 256,
997         .cmd_per_lun            = 5,
998         .max_sectors            = 128,
999         .use_clustering         = DISABLE_CLUSTERING,
1000         .emulated               = 1,
1001         .proc_name              = "ide-scsi",
1002 };
1003
1004 static int ide_scsi_probe(ide_drive_t *drive)
1005 {
1006         idescsi_scsi_t *idescsi;
1007         struct Scsi_Host *host;
1008         struct gendisk *g;
1009         static int warned;
1010         int err = -ENOMEM;
1011
1012         if (!warned && drive->media == ide_cdrom) {
1013                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1014                 warned = 1;
1015         }
1016
1017         if (idescsi_nocd && drive->media == ide_cdrom)
1018                 return -ENODEV;
1019
1020         if (!strstr("ide-scsi", drive->driver_req) ||
1021             !drive->present ||
1022             drive->media == ide_disk ||
1023             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1024                 return -ENODEV;
1025
1026         g = alloc_disk(1 << PARTN_BITS);
1027         if (!g)
1028                 goto out_host_put;
1029
1030         ide_init_disk(g, drive);
1031
1032         host->max_id = 1;
1033
1034 #if IDESCSI_DEBUG_LOG
1035         if (drive->id->last_lun)
1036                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1037 #endif
1038         if ((drive->id->last_lun & 0x7) != 7)
1039                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1040         else
1041                 host->max_lun = 1;
1042
1043         drive->driver_data = host;
1044         idescsi = scsihost_to_idescsi(host);
1045         idescsi->drive = drive;
1046         idescsi->driver = &idescsi_driver;
1047         idescsi->host = host;
1048         idescsi->disk = g;
1049         g->private_data = &idescsi->driver;
1050         ide_proc_register_driver(drive, &idescsi_driver);
1051         err = 0;
1052         idescsi_setup(drive, idescsi);
1053         g->fops = &idescsi_ops;
1054         ide_register_region(g);
1055         err = scsi_add_host(host, &drive->gendev);
1056         if (!err) {
1057                 scsi_scan_host(host);
1058                 return 0;
1059         }
1060         /* fall through on error */
1061         ide_unregister_region(g);
1062         ide_proc_unregister_driver(drive, &idescsi_driver);
1063
1064         put_disk(g);
1065 out_host_put:
1066         scsi_host_put(host);
1067         return err;
1068 }
1069
1070 static int __init init_idescsi_module(void)
1071 {
1072         return driver_register(&idescsi_driver.gen_driver);
1073 }
1074
1075 static void __exit exit_idescsi_module(void)
1076 {
1077         driver_unregister(&idescsi_driver.gen_driver);
1078 }
1079
1080 module_param(idescsi_nocd, int, 0600);
1081 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1082 module_init(init_idescsi_module);
1083 module_exit(exit_idescsi_module);
1084 MODULE_LICENSE("GPL");