summaryrefslogtreecommitdiffstats
path: root/drivers/usb/storage/sddr55.c
blob: 229ca181716b507934db9daeca07990a7774c0c6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
/* Driver for SanDisk SDDR-55 SmartMedia reader
 *
 * $Id:$
 *
 * SDDR55 driver v0.1:
 *
 * First release
 *
 * Current development and maintenance by:
 *   (c) 2002 Simon Munton
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/slab.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>

#include "usb.h"
#include "transport.h"
#include "protocol.h"
#include "debug.h"
#include "sddr55.h"


#define short_pack(lsb,msb) ( ((u16)(lsb)) | ( ((u16)(msb))<<8 ) )
#define LSB_of(s) ((s)&0xFF)
#define MSB_of(s) ((s)>>8)
#define PAGESIZE  512

#define set_sense_info(sk, asc, ascq)	\
    do {				\
	info->sense_data[2] = sk;	\
	info->sense_data[12] = asc;	\
	info->sense_data[13] = ascq;	\
	} while (0)


struct sddr55_card_info {
	unsigned long	capacity;	/* Size of card in bytes */
	int		max_log_blks;	/* maximum number of logical blocks */
	int		pageshift;	/* log2 of pagesize */
	int		smallpageshift;	/* 1 if pagesize == 256 */
	int		blocksize;	/* Size of block in pages */
	int		blockshift;	/* log2 of blocksize */
	int		blockmask;	/* 2^blockshift - 1 */
	int		read_only;	/* non zero if card is write protected */
	int		force_read_only;	/* non zero if we find a map error*/
	int		*lba_to_pba;	/* logical to physical map */
	int		*pba_to_lba;	/* physical to logical map */
	int		fatal_error;	/* set if we detect something nasty */
	unsigned long 	last_access;	/* number of jiffies since we last talked to device */
	unsigned char   sense_data[18];
};


#define NOT_ALLOCATED		0xffffffff
#define BAD_BLOCK		0xffff
#define CIS_BLOCK		0x400
#define UNUSED_BLOCK		0x3ff

static int
sddr55_bulk_transport(struct us_data *us, int direction,
		      unsigned char *data, unsigned int len) {
	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
	unsigned int pipe = (direction == DMA_FROM_DEVICE) ?
			us->recv_bulk_pipe : us->send_bulk_pipe;

	if (!len)
		return USB_STOR_XFER_GOOD;
	info->last_access = jiffies;
	return usb_stor_bulk_transfer_buf(us, pipe, data, len, NULL);
}

/* check if card inserted, if there is, update read_only status
 * return non zero if no card
 */

static int sddr55_status(struct us_data *us)
{
	int result;
	unsigned char *command = us->iobuf;
	unsigned char *status = us->iobuf;
	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;

	/* send command */
	memset(command, 0, 8);
	command[5] = 0xB0;
	command[7] = 0x80;
	result = sddr55_bulk_transport(us,
		DMA_TO_DEVICE, command, 8);

	US_DEBUGP("Result for send_command in status %d\n",
		result);

	if (result != USB_STOR_XFER_GOOD) {
		set_sense_info (4, 0, 0);	/* hardware error */
		return USB_STOR_TRANSPORT_ERROR;
	}

	result = sddr55_bulk_transport(us,
		DMA_FROM_DEVICE, status,	4);

	/* expect to get short transfer if no card fitted */
	if (result == USB_STOR_XFER_SHORT || result == USB_STOR_XFER_STALLED) {
		/* had a short transfer, no card inserted, free map memory */
		if (info->lba_to_pba)
			kfree(info->lba_to_pba);
		if (info->pba_to_lba)
			kfree(info->pba_to_lba);
		info->lba_to_pba = NULL;
		info->pba_to_lba = NULL;

		info->fatal_error = 0;
		info->force_read_only = 0;

		set_sense_info (2, 0x3a, 0);	/* not ready, medium not present */
		return USB_STOR_TRANSPORT_FAILED;
	}

	if (result != USB_STOR_XFER_GOOD) {
		set_sense_info (4, 0, 0);	/* hardware error */
		return USB_STOR_TRANSPORT_FAILED;
	}
	
	/* check write protect status */
	info->read_only = (status[0] & 0x20);

	/* now read status */
	result = sddr55_bulk_transport(us,
		DMA_FROM_DEVICE, status,	2);

	if (result != USB_STOR_XFER_GOOD) {
		set_sense_info (4, 0, 0);	/* hardware error */
	}

	return (result == USB_STOR_XFER_GOOD ?
			USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_FAILED);
}


static int sddr55_read_data(struct us_data *us,
		unsigned int lba,
		unsigned int page,
		unsigned short sectors) {

	int result = USB_STOR_TRANSPORT_GOOD;
	unsigned char *command = us->iobuf;
	unsigned char *status = us->iobuf;
	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
	unsigned char *buffer;

	unsigned int pba;
	unsigned long address;

	unsigned short pages;
	unsigned int len, index, offset;

	// Since we only read in one block at a time, we have to create
	// a bounce buffer and move the data a piece at a time between the
	// bounce buffer and the actual transfer buffer.

	len = min((unsigned int) sectors, (unsigned int) info->blocksize >>
			info->smallpageshift) * PAGESIZE;
	buffer = kmalloc(len, GFP_NOIO);
	if (buffer == NULL)
		return USB_STOR_TRANSPORT_ERROR; /* out of memory */
	index = offset = 0;

	while (sectors>0) {

		/* have we got to end? */
		if (lba >= info->max_log_blks)
			break;

		pba = info->lba_to_pba[lba];

		// Read as many sectors as possible in this block

		pages = min((unsigned int) sectors << info->smallpageshift,
				info->blocksize - page);
		len = pages << info->pageshift;

		US_DEBUGP("Read %02X pages, from PBA %04X"
			" (LBA %04X) page %02X\n",
			pages, pba, lba, page);

		if (pba == NOT_ALLOCATED) {
			/* no pba for this lba, fill with zeroes */
			memset (buffer, 0, len);
		} else {

			address = (pba << info->blockshift) + page;

			command[0] = 0;
			command[1] = LSB_of(address>>16);
			command[2] = LSB_of(address>>8);
			command[3] = LSB_of(address);

			command[4] = 0;
			command[5] = 0xB0;
			command[6] = LSB_of(pages << (1 - info->smallpageshift));
			command[7] = 0x85;

			/* send command */
			result = sddr55_bulk_transport(us,
				DMA_TO_DEVICE, command, 8);

			US_DEBUGP("Result for send_command in read_data %d\n",
				result);

			if (result != USB_STOR_XFER_GOOD) {
				result = USB_STOR_TRANSPORT_ERROR;
				goto leave;
			}

			/* read data */
			result = sddr55_bulk_transport(us,
				DMA_FROM_DEVICE, buffer, len);

			if (result != USB_STOR_XFER_GOOD) {
				result = USB_STOR_TRANSPORT_ERROR;
				goto leave;
			}

			/* now read status */
			result = sddr55_bulk_transport(us,
				DMA_FROM_DEVICE, status, 2);

			if (result != USB_STOR_XFER_GOOD) {
				result = USB_STOR_TRANSPORT_ERROR;
				goto leave;
			}

			/* check status for error */
			if (status[0] == 0xff && status[1] == 0x4) {
				set_sense_info (3, 0x11, 0);
				result = USB_STOR_TRANSPORT_FAILED;
				goto leave;
			}
		}

		// Store the data in the transfer buffer
		usb_stor_access_xfer_buf(buffer, len, us->srb,
				&index, &offset, TO_XFER_BUF);

		page = 0;
		lba++;
		sectors -= pages >> info->smallpageshift;
	}

	result = USB_STOR_TRANSPORT_GOOD;

leave:
	kfree(buffer);

	return result;
}

static int sddr55_write_data(struct us_data *us,
		unsigned int lba,
		unsigned int page,
		unsigned short sectors) {

	int result = USB_STOR_TRANSPORT_GOOD;
	unsigned char *command = us->iobuf;
	unsigned char *status = us->iobuf;
	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
	unsigned char *buffer;

	unsigned int pba;
	unsigned int new_pba;
	unsigned long address;

	unsigned short pages;
	int i;
	unsigned int len, index, offset;

	/* check if we are allowed to write */
	if (info->read_only || info->force_read_only) {
		set_sense_info (7, 0x27, 0);	/* read only */
		return USB_STOR_TRANSPORT_FAILED;
	}

	// Since we only write one block at a time, we have to create
	// a bounce buffer and move the data a piece at a time between the
	// bounce buffer and the actual transfer buffer.

	len = min((unsigned int) sectors, (unsigned int) info->blocksize >>
			info->smallpageshift) * PAGESIZE;
	buffer = kmalloc(len, GFP_NOIO);
	if (buffer == NULL)
		return USB_STOR_TRANSPORT_ERROR;
	index = offset = 0;

	while (sectors > 0) {

		/* have we got to end? */
		if (lba >= info->max_log_blks)
			break;

		pba = info->lba_to_pba[lba];

		// Write as many sectors as possible in this block

		pages = min((unsigned int) sectors << info->smallpageshift,
				info->blocksize - page);
		len = pages << info->pageshift;

		// Get the data from the transfer buffer
		usb_stor_access_xfer_buf(buffer, len, us->srb,
				&index, &offset, FROM_XFER_BUF);

		US_DEBUGP("Write %02X pages, to PBA %04X"
			" (LBA %04X) page %02X\n",
			pages, pba, lba, page);
			
		command[4] = 0;

		if (pba == NOT_ALLOCATED) {
			/* no pba allocated for this lba, find a free pba to use */

			int max_pba = (info->max_log_blks / 250 ) * 256;
			int found_count = 0;
			int found_pba = -1;

			/* set pba to first block in zone lba is in */
			pba = (lba / 1000) * 1024;

			US_DEBUGP("No PBA for LBA %04X\n",lba);

			if (max_pba > 1024)
				max_pba = 1024;

			/*
			 * Scan through the map looking for an unused block
			 * leave 16 unused blocks at start (or as many as
			 * possible) since the sddr55 seems to reuse a used
			 * block when it shouldn't if we don't leave space.
			 */
			for (i = 0; i < max_pba; i++, pba++) {
				if (info->pba_to_lba[pba] == UNUSED_BLOCK) {
					found_pba = pba;
					if (found_count++ > 16)
						break;
				}
			}

			pba = found_pba;

			if (pba == -1) {
				/* oh dear */
				US_DEBUGP("Couldn't find unallocated block\n");

				set_sense_info (3, 0x31, 0);	/* medium error */
				result = USB_STOR_TRANSPORT_FAILED;
				goto leave;
			}

			US_DEBUGP("Allocating PBA %04X for LBA %04X\n", pba, lba);

			/* set writing to unallocated block flag */
			command[4] = 0x40;
		}

		address = (pba << info->blockshift) + page;

		command[1] = LSB_of(address>>16);
		command[2] = LSB_of(address>>8); 
		command[3] = LSB_of(address);

		/* set the lba into the command, modulo 1000 */
		command[0] = LSB_of(lba % 1000);
		command[6] = MSB_of(lba % 1000);

		command[4] |= LSB_of(pages >> info->smallpageshift);
		command[5] = 0xB0;
		command[7] = 0x86;

		/* send command */
		result = sddr55_bulk_transport(us,
			DMA_TO_DEVICE, command, 8);

		if (result != USB_STOR_XFER_GOOD) {
			US_DEBUGP("Result for send_command in write_data %d\n",
			result);

			/* set_sense_info is superfluous here? */
			set_sense_info (3, 0x3, 0);/* peripheral write error */
			result = USB_STOR_TRANSPORT_FAILED;
			goto leave;
		}

		/* send the data */
		result = sddr55_bulk_transport(us,
			DMA_TO_DEVICE, buffer, len);

		if (result != USB_STOR_XFER_GOOD) {
			US_DEBUGP("Result for send_data in write_data %d\n",
				  result);

			/* set_sense_info is superfluous here? */
			set_sense_info (3, 0x3, 0);/* peripheral write error */
			result = USB_STOR_TRANSPORT_FAILED;
			goto leave;
		}

		/* now read status */
		result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, status, 6);

		if (result != USB_STOR_XFER_GOOD) {
			US_DEBUGP("Result for get_status in write_data %d\n",
				  result);

			/* set_sense_info is superfluous here? */
			set_sense_info (3, 0x3, 0);/* peripheral write error */
			result = USB_STOR_TRANSPORT_FAILED;
			goto leave;
		}

		new_pba = (status[3] + (status[4] << 8) + (status[5] << 16))
						  >> info->blockshift;

		/* check status for error */
		if (status[0] == 0xff && status[1] == 0x4) {
			info->pba_to_lba[new_pba] = BAD_BLOCK;

			set_sense_info (3, 0x0c, 0);
			result = USB_STOR_TRANSPORT_FAILED;
			goto leave;
		}

		US_DEBUGP("Updating maps for LBA %04X: old PBA %04X, new PBA %04X\n",
			lba, pba, new_pba);

		/* update the lba<->pba maps, note new_pba might be the same as pba */
		info->lba_to_pba[lba] = new_pba;
		info->pba_to_lba[pba] = UNUSED_BLOCK;

		/* check that new_pba wasn't already being used */
		if (info->pba_to_lba[new_pba] != UNUSED_BLOCK) {
			printk(KERN_ERR "sddr55 error: new PBA %04X already in use for LBA %04X\n",
				new_pba, info->pba_to_lba[new_pba]);
			info->fatal_error = 1;
			set_sense_info (3, 0x31, 0);
			result = USB_STOR_TRANSPORT_FAILED;
			goto leave;
		}

		/* update the pba<->lba maps for new_pba */
		info->pba_to_lba[new_pba] = lba % 1000;

		page = 0;
		lba++;
		sectors -= pages >> info->smallpageshift;
	}
	result = USB_STOR_TRANSPORT_GOOD;

 leave:
	kfree(buffer);
	return result;
}

static int sddr55_read_deviceID(struct us_data *us,
		unsigned char *manufacturerID,
		unsigned char *deviceID) {

	int result;
	unsigned char *command = us->iobuf;
	unsigned char *content = us->iobuf;

	memset(command, 0, 8);
	command[5] = 0xB0;
	command[7] = 0x84;
	result = sddr55_bulk_transport(us, DMA_TO_DEVICE, command, 8);

	US_DEBUGP("Result of send_control for device ID is %d\n",
		result);

	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	result = sddr55_bulk_transport(us,
		DMA_FROM_DEVICE, content, 4);

	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	*manufacturerID = content[0];
	*deviceID = content[1];

	if (content[0] != 0xff)	{
    		result = sddr55_bulk_transport(us,
			DMA_FROM_DEVICE, content, 2);
	}

	return USB_STOR_TRANSPORT_GOOD;
}


int sddr55_reset(struct us_data *us) {
	return 0;
}


static unsigned long sddr55_get_capacity(struct us_data *us) {

	unsigned char manufacturerID;
	unsigned char deviceID;
	int result;
	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;

	US_DEBUGP("Reading capacity...\n");

	result = sddr55_read_deviceID(us,
		&manufacturerID,
		&deviceID);

	US_DEBUGP("Result of read_deviceID is %d\n",
		result);

	if (result != USB_STOR_XFER_GOOD)
		return 0;

	US_DEBUGP("Device ID = %02X\n", deviceID);
	US_DEBUGP("Manuf  ID = %02X\n", manufacturerID);

	info->pageshift = 9;
	info->smallpageshift = 0;
	info->blocksize = 16;
	info->blockshift = 4;
	info->blockmask = 15;

	switch (deviceID) {

	case 0x6e: // 1MB
	case 0xe8:
	case 0xec:
		info->pageshift = 8;
		info->smallpageshift = 1;
		return 0x00100000;

	case 0xea: // 2MB
	case 0x64:
		info->pageshift = 8;
		info->smallpageshift = 1;
	case 0x5d: // 5d is a ROM card with pagesize 512.
		return 0x00200000;

	case 0xe3: // 4MB
	case 0xe5:
	case 0x6b:
	case 0xd5:
		return 0x00400000;

	case 0xe6: // 8MB
	case 0xd6:
		return 0x00800000;

	case 0x73: // 16MB
		info->blocksize = 32;
		info->blockshift = 5;
		info->blockmask = 31;
		return 0x01000000;

	case 0x75: // 32MB
		info->blocksize = 32;
		info->blockshift = 5;
		info->blockmask = 31;
		return 0x02000000;

	case 0x76: // 64MB
		info->blocksize = 32;
		info->blockshift = 5;
		info->blockmask = 31;
		return 0x04000000;

	case 0x79: // 128MB
		info->blocksize = 32;
		info->blockshift = 5;
		info->blockmask = 31;
		return 0x08000000;

	default: // unknown
		return 0;

	}
}

static int sddr55_read_map(struct us_data *us) {

	struct sddr55_card_info *info = (struct sddr55_card_info *)(us->extra);
	int numblocks;
	unsigned char *buffer;
	unsigned char *command = us->iobuf;
	int i;
	unsigned short lba;
	unsigned short max_lba;
	int result;

	if (!info->capacity)
		return -1;

	numblocks = info->capacity >> (info->blockshift + info->pageshift);
	
	buffer = kmalloc( numblocks * 2, GFP_NOIO );
	
	if (!buffer)
		return -1;

	memset(command, 0, 8);
	command[5] = 0xB0;
	command[6] = numblocks * 2 / 256;
	command[7] = 0x8A;

	result = sddr55_bulk_transport(us, DMA_TO_DEVICE, command, 8);

	if ( result != USB_STOR_XFER_GOOD) {
		kfree (buffer);
		return -1;
	}

	result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, buffer, numblocks * 2);

	if ( result != USB_STOR_XFER_GOOD) {
		kfree (buffer);
		return -1;
	}

	result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, command, 2);

	if ( result != USB_STOR_XFER_GOOD) {
		kfree (buffer);
		return -1;
	}

	if (info->lba_to_pba)
		kfree(info->lba_to_pba);
	if (info->pba_to_lba)
		kfree(info->pba_to_lba);
	info->lba_to_pba = kmalloc(numblocks*sizeof(int), GFP_NOIO);
	info->pba_to_lba = kmalloc(numblocks*sizeof(int), GFP_NOIO);

	if (info->lba_to_pba == NULL || info->pba_to_lba == NULL) {
		if (info->lba_to_pba != NULL)
			kfree(info->lba_to_pba);
		if (info->pba_to_lba != NULL)
			kfree(info->pba_to_lba);
		info->lba_to_pba = NULL;
		info->pba_to_lba = NULL;
		kfree(buffer);
		return -1;
	}

	memset(info->lba_to_pba, 0xff, numblocks*sizeof(int));
	memset(info->pba_to_lba, 0xff, numblocks*sizeof(int));

	/* set maximum lba */
	max_lba = info->max_log_blks;
	if (max_lba > 1000)
		max_lba = 1000;

	// Each block is 64 bytes of control data, so block i is located in
	// scatterlist block i*64/128k = i*(2^6)*(2^-17) = i*(2^-11)

	for (i=0; i<numblocks; i++) {
		int zone = i / 1024;

		lba = short_pack(buffer[i * 2], buffer[i * 2 + 1]);

			/* Every 1024 physical blocks ("zone"), the LBA numbers
			 * go back to zero, but are within a higher
			 * block of LBA's. Also, there is a maximum of
			 * 1000 LBA's per zone. In other words, in PBA
			 * 1024-2047 you will find LBA 0-999 which are
			 * really LBA 1000-1999. Yes, this wastes 24
			 * physical blocks per zone. Go figure. 
			 * These devices can have blocks go bad, so there
			 * are 24 spare blocks to use when blocks do go bad.
			 */

			/* SDDR55 returns 0xffff for a bad block, and 0x400 for the 
			 * CIS block. (Is this true for cards 8MB or less??)
			 * Record these in the physical to logical map
			 */ 

		info->pba_to_lba[i] = lba;

		if (lba >= max_lba) {
			continue;
		}
		
		if (info->lba_to_pba[lba + zone * 1000] != NOT_ALLOCATED &&
		    !info->force_read_only) {
			printk("sddr55: map inconsistency at LBA %04X\n", lba + zone * 1000);
			info->force_read_only = 1;
		}

		if (lba<0x10 || (lba>=0x3E0 && lba<0x3EF))
			US_DEBUGP("LBA %04X <-> PBA %04X\n", lba, i);

		info->lba_to_pba[lba + zone * 1000] = i;
	}

	kfree(buffer);
	return 0;
}


static void sddr55_card_info_destructor(void *extra) {
	struct sddr55_card_info *info = (struct sddr55_card_info *)extra;

	if (!extra)
		return;

	if (info->lba_to_pba)
		kfree(info->lba_to_pba);
	if (info->pba_to_lba)
		kfree(info->pba_to_lba);
}


/*
 * Transport for the Sandisk SDDR-55
 */
int sddr55_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	int result;
	static unsigned char inquiry_response[8] = {
		0x00, 0x80, 0x00, 0x02, 0x1F, 0x00, 0x00, 0x00
	};
 	// write-protected for now, no block descriptor support
	static unsigned char mode_page_01[20] = {
		0x0, 0x12, 0x00, 0x80, 0x0, 0x0, 0x0, 0x0,
		0x01, 0x0A,
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
	};
	unsigned char *ptr = us->iobuf;
	unsigned long capacity;
	unsigned int lba;
	unsigned int pba;
	unsigned int page;
	unsigned short pages;
	struct sddr55_card_info *info;

	if (!us->extra) {
		us->extra = kmalloc(
			sizeof(struct sddr55_card_info), GFP_NOIO);
		if (!us->extra)
			return USB_STOR_TRANSPORT_ERROR;
		memset(us->extra, 0, sizeof(struct sddr55_card_info));
		us->extra_destructor = sddr55_card_info_destructor;
	}

	info = (struct sddr55_card_info *)(us->extra);

	if (srb->cmnd[0] == REQUEST_SENSE) {
		US_DEBUGP("SDDR55: request sense %02x/%02x/%02x\n", info->sense_data[2], info->sense_data[12], info->sense_data[13]);

		memcpy (ptr, info->sense_data, sizeof info->sense_data);
		ptr[0] = 0x70;
		ptr[7] = 11;
		usb_stor_set_xfer_buf (ptr, sizeof info->sense_data, srb);
		memset (info->sense_data, 0, sizeof info->sense_data);

		return USB_STOR_TRANSPORT_GOOD;
	}

	memset (info->sense_data, 0, sizeof info->sense_data);

	/* Dummy up a response for INQUIRY since SDDR55 doesn't
	   respond to INQUIRY commands */

	if (srb->cmnd[0] == INQUIRY) {
		memcpy(ptr, inquiry_response, 8);
		fill_inquiry_response(us, ptr, 36);
		return USB_STOR_TRANSPORT_GOOD;
	}

	/* only check card status if the map isn't allocated, ie no card seen yet
	 * or if it's been over half a second since we last accessed it
	 */
	if (info->lba_to_pba == NULL || time_after(jiffies, info->last_access + HZ/2)) {

		/* check to see if a card is fitted */
		result = sddr55_status (us);
		if (result) {
			result = sddr55_status (us);
			if (!result) {
			set_sense_info (6, 0x28, 0);	/* new media, set unit attention, not ready to ready */
			}
			return USB_STOR_TRANSPORT_FAILED;
		}
	}

	/* if we detected a problem with the map when writing,
	   don't allow any more access */
	if (info->fatal_error) {

		set_sense_info (3, 0x31, 0);
		return USB_STOR_TRANSPORT_FAILED;
	}

	if (srb->cmnd[0] == READ_CAPACITY) {

		capacity = sddr55_get_capacity(us);

		if (!capacity) {
			set_sense_info (3, 0x30, 0); /* incompatible medium */
			return USB_STOR_TRANSPORT_FAILED;
		}

		info->capacity = capacity;

		/* figure out the maximum logical block number, allowing for
		 * the fact that only 250 out of every 256 are used */
		info->max_log_blks = ((info->capacity >> (info->pageshift + info->blockshift)) / 256) * 250;

		/* Last page in the card, adjust as we only use 250 out of
		 * every 256 pages */
		capacity = (capacity / 256) * 250;

		capacity /= PAGESIZE;
		capacity--;

		((__be32 *) ptr)[0] = cpu_to_be32(capacity);
		((__be32 *) ptr)[1] = cpu_to_be32(PAGESIZE);
		usb_stor_set_xfer_buf(ptr, 8, srb);

		sddr55_read_map(us);

		return USB_STOR_TRANSPORT_GOOD;
	}

	if (srb->cmnd[0] == MODE_SENSE_10) {

		memcpy(ptr, mode_page_01, sizeof mode_page_01);
		ptr[3] = (info->read_only || info->force_read_only) ? 0x80 : 0;
		usb_stor_set_xfer_buf(ptr, sizeof(mode_page_01), srb);

		if ( (srb->cmnd[2] & 0x3F) == 0x01 ) {
			US_DEBUGP(
			  "SDDR55: Dummy up request for mode page 1\n");
			return USB_STOR_TRANSPORT_GOOD;

		} else if ( (srb->cmnd[2] & 0x3F) == 0x3F ) {
			US_DEBUGP(
			  "SDDR55: Dummy up request for all mode pages\n");
			return USB_STOR_TRANSPORT_GOOD;
		}

		set_sense_info (5, 0x24, 0);	/* invalid field in command */
		return USB_STOR_TRANSPORT_FAILED;
	}

	if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {

		US_DEBUGP(
		  "SDDR55: %s medium removal. Not that I can do"
		  " anything about it...\n",
		  (srb->cmnd[4]&0x03) ? "Prevent" : "Allow");

		return USB_STOR_TRANSPORT_GOOD;

	}

	if (srb->cmnd[0] == READ_10 || srb->cmnd[0] == WRITE_10) {

		page = short_pack(srb->cmnd[3], srb->cmnd[2]);
		page <<= 16;
		page |= short_pack(srb->cmnd[5], srb->cmnd[4]);
		pages = short_pack(srb->cmnd[8], srb->cmnd[7]);

		page <<= info->smallpageshift;

		// convert page to block and page-within-block

		lba = page >> info->blockshift;
		page = page & info->blockmask;

		// locate physical block corresponding to logical block

		if (lba >= info->max_log_blks) {

			US_DEBUGP("Error: Requested LBA %04X exceeds maximum "
			  "block %04X\n", lba, info->max_log_blks-1);

			set_sense_info (5, 0x24, 0);	/* invalid field in command */

			return USB_STOR_TRANSPORT_FAILED;
		}

		pba = info->lba_to_pba[lba];

		if (srb->cmnd[0] == WRITE_10) {
			US_DEBUGP("WRITE_10: write block %04X (LBA %04X) page %01X"
				" pages %d\n",
				pba, lba, page, pages);

			return sddr55_write_data(us, lba, page, pages);
		} else {
			US_DEBUGP("READ_10: read block %04X (LBA %04X) page %01X"
				" pages %d\n",
				pba, lba, page, pages);

			return sddr55_read_data(us, lba, page, pages);
		}
	}


	if (srb->cmnd[0] == TEST_UNIT_READY) {
		return USB_STOR_TRANSPORT_GOOD;
	}

	if (srb->cmnd[0] == START_STOP) {
		return USB_STOR_TRANSPORT_GOOD;
	}

	set_sense_info (5, 0x20, 0);	/* illegal command */

	return USB_STOR_TRANSPORT_FAILED; // FIXME: sense buffer?
}

OpenPOWER on IntegriCloud