Merge git://git.linux-nfs.org/pub/linux/nfs-2.6
[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
51 #include <asm/io.h>
52 #include <asm/bitops.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         int b_count;                            /* Bytes transferred from current entry */
74         struct scsi_cmnd *scsi_cmd;             /* SCSI command */
75         void (*done)(struct scsi_cmnd *);       /* Scsi completion routine */
76         unsigned long flags;                    /* Status/Action flags */
77         unsigned long timeout;                  /* Command timeout */
78 } idescsi_pc_t;
79
80 /*
81  *      Packet command status bits.
82  */
83 #define PC_DMA_IN_PROGRESS              0       /* 1 while DMA in progress */
84 #define PC_WRITING                      1       /* Data direction */
85 #define PC_TIMEDOUT                     3       /* command timed out */
86 #define PC_DMA_OK                       4       /* Use DMA */
87
88 /*
89  *      SCSI command transformation layer
90  */
91 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
92
93 /*
94  *      Log flags
95  */
96 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
97
98 typedef struct ide_scsi_obj {
99         ide_drive_t             *drive;
100         ide_driver_t            *driver;
101         struct gendisk          *disk;
102         struct Scsi_Host        *host;
103
104         idescsi_pc_t *pc;                       /* Current packet command */
105         unsigned long flags;                    /* Status/Action flags */
106         unsigned long transform;                /* SCSI cmd translation layer */
107         unsigned long log;                      /* log flags */
108 } idescsi_scsi_t;
109
110 static DEFINE_MUTEX(idescsi_ref_mutex);
111 static int idescsi_nocd;                        /* Set by module param to skip cd */
112
113 #define ide_scsi_g(disk) \
114         container_of((disk)->private_data, struct ide_scsi_obj, driver)
115
116 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
117 {
118         struct ide_scsi_obj *scsi = NULL;
119
120         mutex_lock(&idescsi_ref_mutex);
121         scsi = ide_scsi_g(disk);
122         if (scsi)
123                 scsi_host_get(scsi->host);
124         mutex_unlock(&idescsi_ref_mutex);
125         return scsi;
126 }
127
128 static void ide_scsi_put(struct ide_scsi_obj *scsi)
129 {
130         mutex_lock(&idescsi_ref_mutex);
131         scsi_host_put(scsi->host);
132         mutex_unlock(&idescsi_ref_mutex);
133 }
134
135 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
136 {
137         return (idescsi_scsi_t*) (&host[1]);
138 }
139
140 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
141 {
142         return scsihost_to_idescsi(ide_drive->driver_data);
143 }
144
145 /*
146  *      Per ATAPI device status bits.
147  */
148 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
149
150 /*
151  *      ide-scsi requests.
152  */
153 #define IDESCSI_PC_RQ                   90
154
155 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
156 {
157         while (bcount--)
158                 (void) HWIF(drive)->INB(IDE_DATA_REG);
159 }
160
161 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
162 {
163         while (bcount--)
164                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
165 }
166
167 /*
168  *      PIO data transfer routines using the scatter gather table.
169  */
170 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
171 {
172         int count;
173         char *buf;
174
175         while (bcount) {
176                 if (pc->sg - 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);
180                         return;
181                 }
182                 count = min(pc->sg->length - pc->b_count, bcount);
183                 if (PageHighMem(pc->sg->page)) {
184                         unsigned long flags;
185
186                         local_irq_save(flags);
187                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
188                                         pc->sg->offset;
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);
193                 } else {
194                         buf = page_address(pc->sg->page) + pc->sg->offset;
195                         drive->hwif->atapi_input_bytes(drive,
196                                                 buf + pc->b_count, count);
197                 }
198                 bcount -= count; pc->b_count += count;
199                 if (pc->b_count == pc->sg->length) {
200                         pc->sg++;
201                         pc->b_count = 0;
202                 }
203         }
204 }
205
206 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
207 {
208         int count;
209         char *buf;
210
211         while (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);
216                         return;
217                 }
218                 count = min(pc->sg->length - pc->b_count, bcount);
219                 if (PageHighMem(pc->sg->page)) {
220                         unsigned long flags;
221
222                         local_irq_save(flags);
223                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
224                                                 pc->sg->offset;
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);
229                 } else {
230                         buf = page_address(pc->sg->page) + pc->sg->offset;
231                         drive->hwif->atapi_output_bytes(drive,
232                                                 buf + pc->b_count, count);
233                 }
234                 bcount -= count; pc->b_count += count;
235                 if (pc->b_count == pc->sg->length) {
236                         pc->sg++;
237                         pc->b_count = 0;
238                 }
239         }
240 }
241
242 static void hexdump(u8 *x, int len)
243 {
244         int i;
245
246         printk("[ ");
247         for (i = 0; i < len; i++)
248                 printk("%x ", x[i]);
249         printk("]\n");
250 }
251
252 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
253 {
254         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
255         idescsi_pc_t   *pc;
256         struct request *rq;
257         u8             *buf;
258
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) {
264                 kfree(buf);
265                 kfree(rq);
266                 kfree(pc);
267                 return -ENOMEM;
268         }
269         ide_init_drive_cmd(rq);
270         rq->special = (char *) pc;
271         pc->rq = rq;
272         pc->buffer = buf;
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);
282                 hexdump(pc->c, 6);
283         }
284         rq->rq_disk = scsi->disk;
285         return ide_do_drive_cmd(drive, rq, ide_preempt);
286 }
287
288 static int idescsi_end_request(ide_drive_t *, int, int);
289
290 static ide_startstop_t
291 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
292 {
293         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
294                 /* force an abort */
295                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
296
297         rq->errors++;
298
299         idescsi_end_request(drive, 0, 0);
300
301         return ide_stopped;
302 }
303
304 static ide_startstop_t
305 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
306 {
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);
310 #endif
311         rq->errors |= ERROR_MAX;
312
313         idescsi_end_request(drive, 0, 0);
314
315         return ide_stopped;
316 }
317
318 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
319 {
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;
326         unsigned long flags;
327
328         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
329                 ide_end_request(drive, uptodate, nrsecs);
330                 return 0;
331         }
332         ide_end_drive_cmd (drive, 0, 0);
333         if (blk_sense_request(rq)) {
334                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
335                 if (log) {
336                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
337                         hexdump(pc->buffer,16);
338                 }
339                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
340                 kfree(pc->buffer);
341                 kfree(pc);
342                 kfree(rq);
343                 pc = opc;
344                 rq = pc->rq;
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)) {
348                 if (log)
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;
354                 if (log)
355                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
356         } else if (errors) {
357                 if (log)
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 */
361                         return 0;
362                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
363         } else {
364                 pc->scsi_cmd->result = DID_OK << 16;
365         }
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);
370         kfree(pc);
371         kfree(rq);
372         scsi->pc = NULL;
373         return 0;
374 }
375
376 static inline unsigned long get_timeout(idescsi_pc_t *pc)
377 {
378         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
379 }
380
381 static int idescsi_expiry(ide_drive_t *drive)
382 {
383         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
384         idescsi_pc_t   *pc   = scsi->pc;
385
386 #if IDESCSI_DEBUG_LOG
387         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
388 #endif
389         set_bit(PC_TIMEDOUT, &pc->flags);
390
391         return 0;                                       /* we do not want the ide subsystem to retry */
392 }
393
394 /*
395  *      Our interrupt handler.
396  */
397 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
398 {
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;
406
407         unsigned int temp;
408
409 #if IDESCSI_DEBUG_LOG
410         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
411 #endif /* IDESCSI_DEBUG_LOG */
412
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);
417 #endif
418                 /* end this request now - scsi should retry it*/
419                 idescsi_end_request (drive, 1, 0);
420                 return ide_stopped;
421         }
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);
428         }
429
430         feature.all = 0;
431         /* Clear the interrupt */
432         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
433
434         if (!status.b.drq) {
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();
439                 if (status.b.check)
440                         rq->errors++;
441                 idescsi_end_request (drive, 1, 0);
442                 return ide_stopped;
443         }
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);
447
448         if (ireason.b.cod) {
449                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
450                 return ide_do_reset (drive);
451         }
452         if (ireason.b.io) {
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;
460                                 if (temp) {
461                                         clear_bit(PC_WRITING, &pc->flags);
462                                         if (pc->sg)
463                                                 idescsi_input_buffers(drive, pc, temp);
464                                         else
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);
467                                 }
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);
472                                 return ide_started;
473                         }
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 */
477                 }
478         }
479         if (ireason.b.io) {
480                 clear_bit(PC_WRITING, &pc->flags);
481                 if (pc->sg)
482                         idescsi_input_buffers(drive, pc, bcount.all);
483                 else
484                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
485         } else {
486                 set_bit(PC_WRITING, &pc->flags);
487                 if (pc->sg)
488                         idescsi_output_buffers (drive, pc, bcount.all);
489                 else
490                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
491         }
492         /* Update the current position */
493         pc->actually_transferred += bcount.all;
494         pc->current_position += bcount.all;
495
496         /* And set the interrupt handler again */
497         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
498         return ide_started;
499 }
500
501 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
502 {
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;
508
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");
512                 return startstop;
513         }
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);
519         }
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);
528         }
529         return ide_started;
530 }
531
532 static inline int idescsi_set_direction(idescsi_pc_t *pc)
533 {
534         switch (pc->c[0]) {
535                 case READ_6: case READ_10: case READ_12:
536                         clear_bit(PC_WRITING, &pc->flags);
537                         return 0;
538                 case WRITE_6: case WRITE_10: case WRITE_12:
539                         set_bit(PC_WRITING, &pc->flags);
540                         return 0;
541                 default:
542                         return 1;
543         }
544 }
545
546 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
547 {
548         ide_hwif_t *hwif = drive->hwif;
549         struct scatterlist *sg, *scsi_sg;
550         int segments;
551
552         if (!pc->request_transfer || pc->request_transfer % 1024)
553                 return 1;
554
555         if (idescsi_set_direction(pc))
556                 return 1;
557
558         sg = hwif->sg_table;
559         scsi_sg = scsi_sglist(pc->scsi_cmd);
560         segments = scsi_sg_count(pc->scsi_cmd);
561
562         if (segments > hwif->sg_max_nents)
563                 return 1;
564
565         hwif->sg_nents = segments;
566         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
567
568         return 0;
569 }
570
571 /*
572  *      Issue a packet command
573  */
574 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
575 {
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;
580
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 */
585
586         feature.all = 0;
587         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
588                 hwif->sg_mapped = 1;
589                 feature.b.dma = !hwif->dma_setup(drive);
590                 hwif->sg_mapped = 0;
591         }
592
593         SELECT_DRIVE(drive);
594         if (IDE_CONTROL_REG)
595                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
596
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);
600
601         if (feature.b.dma)
602                 set_bit(PC_DMA_OK, &pc->flags);
603
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);
610                 return ide_started;
611         } else {
612                 /* Issue the packet command */
613                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
614                 return idescsi_transfer_pc(drive);
615         }
616 }
617
618 /*
619  *      idescsi_do_request is our request handling function.
620  */
621 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
622 {
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 */
627
628         if (blk_sense_request(rq) || blk_special_request(rq)) {
629                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
630         }
631         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
632         idescsi_end_request (drive, 0, 0);
633         return ide_stopped;
634 }
635
636 #ifdef CONFIG_IDE_PROC_FS
637 static void idescsi_add_settings(ide_drive_t *drive)
638 {
639         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
640
641 /*
642  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
643  */
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);
649 }
650 #else
651 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
652 #endif
653
654 /*
655  *      Driver initialization.
656  */
657 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
658 {
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);
666 }
667
668 static void ide_scsi_remove(ide_drive_t *drive)
669 {
670         struct Scsi_Host *scsihost = drive->driver_data;
671         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
672         struct gendisk *g = scsi->disk;
673
674         scsi_remove_host(scsihost);
675         ide_proc_unregister_driver(drive, scsi->driver);
676
677         ide_unregister_region(g);
678
679         drive->driver_data = NULL;
680         g->private_data = NULL;
681         put_disk(g);
682
683         ide_scsi_put(scsi);
684 }
685
686 static int ide_scsi_probe(ide_drive_t *);
687
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 }
692 };
693 #endif
694
695 static ide_driver_t idescsi_driver = {
696         .gen_driver = {
697                 .owner          = THIS_MODULE,
698                 .name           = "ide-scsi",
699                 .bus            = &ide_bus_type,
700         },
701         .probe                  = ide_scsi_probe,
702         .remove                 = ide_scsi_remove,
703         .version                = IDESCSI_VERSION,
704         .media                  = ide_scsi,
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,
712 #endif
713 };
714
715 static int idescsi_ide_open(struct inode *inode, struct file *filp)
716 {
717         struct gendisk *disk = inode->i_bdev->bd_disk;
718         struct ide_scsi_obj *scsi;
719
720         if (!(scsi = ide_scsi_get(disk)))
721                 return -ENXIO;
722
723         return 0;
724 }
725
726 static int idescsi_ide_release(struct inode *inode, struct file *filp)
727 {
728         struct gendisk *disk = inode->i_bdev->bd_disk;
729         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
730
731         ide_scsi_put(scsi);
732
733         return 0;
734 }
735
736 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
737                         unsigned int cmd, unsigned long arg)
738 {
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);
742 }
743
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,
749 };
750
751 static int idescsi_slave_configure(struct scsi_device * sdp)
752 {
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);
757         return 0;
758 }
759
760 static const char *idescsi_info (struct Scsi_Host *host)
761 {
762         return "SCSI host adapter emulation for IDE ATAPI devices";
763 }
764
765 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
766 {
767         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
768
769         if (cmd == SG_SET_TRANSFORM) {
770                 if (arg)
771                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
772                 else
773                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
774                 return 0;
775         } else if (cmd == SG_GET_TRANSFORM)
776                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
777         return -EINVAL;
778 }
779
780 static int idescsi_queue (struct scsi_cmnd *cmd,
781                 void (*done)(struct scsi_cmnd *))
782 {
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;
788
789         if (!drive) {
790                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
791                 goto abort;
792         }
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);
798                 goto abort;
799         }
800
801         memset (pc->c, 0, 12);
802         pc->flags = 0;
803         pc->rq = rq;
804         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
805         pc->buffer = NULL;
806         pc->sg = scsi_sglist(cmd);
807         pc->b_count = 0;
808         pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
809         pc->scsi_cmd = cmd;
810         pc->done = done;
811         pc->timeout = jiffies + cmd->timeout_per_command;
812
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);
818                         hexdump(pc->c, 12);
819                 }
820         }
821
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);
829         return 0;
830 abort:
831         kfree (pc);
832         kfree (rq);
833         cmd->result = DID_ERROR << 16;
834         done(cmd);
835         return 0;
836 }
837
838 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
839 {
840         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
841         ide_drive_t    *drive = scsi->drive;
842         int             busy;
843         int             ret   = FAILED;
844
845         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
846
847         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
848                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
849
850         if (!drive) {
851                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
852                 WARN_ON(1);
853                 goto no_drive;
854         }
855
856         /* First give it some more time, how much is "right" is hard to say :-( */
857
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":"");
861
862         spin_lock_irq(&ide_lock);
863
864         /* If there is no pc running we're done (our interrupt took care of it) */
865         if (!scsi->pc) {
866                 ret = SUCCESS;
867                 goto ide_unlock;
868         }
869
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) {
873                 /*
874                  * FIXME - not sure this condition can ever occur
875                  */
876                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
877
878                 if (blk_sense_request(scsi->pc->rq))
879                         kfree(scsi->pc->buffer);
880                 kfree(scsi->pc->rq);
881                 kfree(scsi->pc);
882                 scsi->pc = NULL;
883
884                 ret = SUCCESS;
885         }
886
887 ide_unlock:
888         spin_unlock_irq(&ide_lock);
889 no_drive:
890         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
891                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
892
893         return ret;
894 }
895
896 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
897 {
898         struct request *req;
899         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
900         ide_drive_t    *drive = scsi->drive;
901         int             ready = 0;
902         int             ret   = SUCCESS;
903
904         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
905
906         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
907                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
908
909         if (!drive) {
910                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
911                 WARN_ON(1);
912                 return FAILED;
913         }
914
915         spin_lock_irq(cmd->device->host->host_lock);
916         spin_lock(&ide_lock);
917
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);
922                 return FAILED;
923         }
924
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);
930         kfree(scsi->pc);
931         scsi->pc = NULL;
932         kfree(req);
933
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);
938         }
939
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);
944
945         ide_do_reset(drive);
946
947         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
948
949         do {
950                 spin_unlock_irq(cmd->device->host->host_lock);
951                 msleep(50);
952                 spin_lock_irq(cmd->device->host->host_lock);
953         } while ( HWGROUP(drive)->handler );
954
955         ready = drive_is_ready(drive);
956         HWGROUP(drive)->busy--;
957         if (!ready) {
958                 printk (KERN_ERR "ide-scsi: reset failed!\n");
959                 ret = FAILED;
960         }
961
962         spin_unlock_irq(cmd->device->host->host_lock);
963         return ret;
964 }
965
966 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
967                 sector_t capacity, int *parm)
968 {
969         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
970         ide_drive_t *drive = idescsi->drive;
971
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;
976         }
977         return 0;
978 }
979
980 static struct scsi_host_template idescsi_template = {
981         .module                 = THIS_MODULE,
982         .name                   = "idescsi",
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,
990         .can_queue              = 40,
991         .this_id                = -1,
992         .sg_tablesize           = 256,
993         .cmd_per_lun            = 5,
994         .max_sectors            = 128,
995         .use_clustering         = DISABLE_CLUSTERING,
996         .emulated               = 1,
997         .proc_name              = "ide-scsi",
998 };
999
1000 static int ide_scsi_probe(ide_drive_t *drive)
1001 {
1002         idescsi_scsi_t *idescsi;
1003         struct Scsi_Host *host;
1004         struct gendisk *g;
1005         static int warned;
1006         int err = -ENOMEM;
1007
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");
1010                 warned = 1;
1011         }
1012
1013         if (idescsi_nocd && drive->media == ide_cdrom)
1014                 return -ENODEV;
1015
1016         if (!strstr("ide-scsi", drive->driver_req) ||
1017             !drive->present ||
1018             drive->media == ide_disk ||
1019             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1020                 return -ENODEV;
1021
1022         g = alloc_disk(1 << PARTN_BITS);
1023         if (!g)
1024                 goto out_host_put;
1025
1026         ide_init_disk(g, drive);
1027
1028         host->max_id = 1;
1029
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);
1033 #endif
1034         if ((drive->id->last_lun & 0x7) != 7)
1035                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1036         else
1037                 host->max_lun = 1;
1038
1039         drive->driver_data = host;
1040         idescsi = scsihost_to_idescsi(host);
1041         idescsi->drive = drive;
1042         idescsi->driver = &idescsi_driver;
1043         idescsi->host = host;
1044         idescsi->disk = g;
1045         g->private_data = &idescsi->driver;
1046         ide_proc_register_driver(drive, &idescsi_driver);
1047         err = 0;
1048         idescsi_setup(drive, idescsi);
1049         g->fops = &idescsi_ops;
1050         ide_register_region(g);
1051         err = scsi_add_host(host, &drive->gendev);
1052         if (!err) {
1053                 scsi_scan_host(host);
1054                 return 0;
1055         }
1056         /* fall through on error */
1057         ide_unregister_region(g);
1058         ide_proc_unregister_driver(drive, &idescsi_driver);
1059
1060         put_disk(g);
1061 out_host_put:
1062         scsi_host_put(host);
1063         return err;
1064 }
1065
1066 static int __init init_idescsi_module(void)
1067 {
1068         return driver_register(&idescsi_driver.gen_driver);
1069 }
1070
1071 static void __exit exit_idescsi_module(void)
1072 {
1073         driver_unregister(&idescsi_driver.gen_driver);
1074 }
1075
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");