summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/devices/doc2001plus.c
blob: 2b30b587c6e840c0e820a9a30aff74ba40f90f3c (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
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
/*
 * Linux driver for Disk-On-Chip Millennium Plus
 *
 * (c) 2002-2003 Greg Ungerer <gerg@snapgear.com>
 * (c) 2002-2003 SnapGear Inc
 * (c) 1999 Machine Vision Holdings, Inc.
 * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>
 *
 * $Id: doc2001plus.c,v 1.14 2005/11/07 11:14:24 gleixner Exp $
 *
 * Released under GPL
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/bitops.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/doc2000.h>

/* #define ECC_DEBUG */

/* I have no idea why some DoC chips can not use memcop_form|to_io().
 * This may be due to the different revisions of the ASIC controller built-in or
 * simplily a QA/Bug issue. Who knows ?? If you have trouble, please uncomment
 * this:*/
#undef USE_MEMCPY

static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
		size_t *retlen, u_char *buf);
static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
		size_t *retlen, const u_char *buf);
static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
			struct mtd_oob_ops *ops);
static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
			 struct mtd_oob_ops *ops);
static int doc_erase (struct mtd_info *mtd, struct erase_info *instr);

static struct mtd_info *docmilpluslist = NULL;


/* Perform the required delay cycles by writing to the NOP register */
static void DoC_Delay(void __iomem * docptr, int cycles)
{
	int i;

	for (i = 0; (i < cycles); i++)
		WriteDOC(0, docptr, Mplus_NOP);
}

#define	CDSN_CTRL_FR_B_MASK	(CDSN_CTRL_FR_B0 | CDSN_CTRL_FR_B1)

/* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
static int _DoC_WaitReady(void __iomem * docptr)
{
	unsigned int c = 0xffff;

	DEBUG(MTD_DEBUG_LEVEL3,
	      "_DoC_WaitReady called for out-of-line wait\n");

	/* Out-of-line routine to wait for chip response */
	while (((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) && --c)
		;

	if (c == 0)
		DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n");

	return (c == 0);
}

static inline int DoC_WaitReady(void __iomem * docptr)
{
	/* This is inline, to optimise the common case, where it's ready instantly */
	int ret = 0;

	/* read form NOP register should be issued prior to the read from CDSNControl
	   see Software Requirement 11.4 item 2. */
	DoC_Delay(docptr, 4);

	if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK)
		/* Call the out-of-line routine to wait */
		ret = _DoC_WaitReady(docptr);

	return ret;
}

/* For some reason the Millennium Plus seems to occassionally put itself
 * into reset mode. For me this happens randomly, with no pattern that I
 * can detect. M-systems suggest always check this on any block level
 * operation and setting to normal mode if in reset mode.
 */
static inline void DoC_CheckASIC(void __iomem * docptr)
{
	/* Make sure the DoC is in normal mode */
	if ((ReadDOC(docptr, Mplus_DOCControl) & DOC_MODE_NORMAL) == 0) {
		WriteDOC((DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_DOCControl);
		WriteDOC(~(DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_CtrlConfirm);
	}
}

/* DoC_Command: Send a flash command to the flash chip through the Flash
 * command register. Need 2 Write Pipeline Terminates to complete send.
 */
static void DoC_Command(void __iomem * docptr, unsigned char command,
			       unsigned char xtraflags)
{
	WriteDOC(command, docptr, Mplus_FlashCmd);
	WriteDOC(command, docptr, Mplus_WritePipeTerm);
	WriteDOC(command, docptr, Mplus_WritePipeTerm);
}

/* DoC_Address: Set the current address for the flash chip through the Flash
 * Address register. Need 2 Write Pipeline Terminates to complete send.
 */
static inline void DoC_Address(struct DiskOnChip *doc, int numbytes,
			       unsigned long ofs, unsigned char xtraflags1,
			       unsigned char xtraflags2)
{
	void __iomem * docptr = doc->virtadr;

	/* Allow for possible Mill Plus internal flash interleaving */
	ofs >>= doc->interleave;

	switch (numbytes) {
	case 1:
		/* Send single byte, bits 0-7. */
		WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress);
		break;
	case 2:
		/* Send bits 9-16 followed by 17-23 */
		WriteDOC((ofs >> 9)  & 0xff, docptr, Mplus_FlashAddress);
		WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress);
		break;
	case 3:
		/* Send 0-7, 9-16, then 17-23 */
		WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress);
		WriteDOC((ofs >> 9)  & 0xff, docptr, Mplus_FlashAddress);
		WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress);
		break;
	default:
		return;
	}

	WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
	WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
}

/* DoC_SelectChip: Select a given flash chip within the current floor */
static int DoC_SelectChip(void __iomem * docptr, int chip)
{
	/* No choice for flash chip on Millennium Plus */
	return 0;
}

/* DoC_SelectFloor: Select a given floor (bank of flash chips) */
static int DoC_SelectFloor(void __iomem * docptr, int floor)
{
	WriteDOC((floor & 0x3), docptr, Mplus_DeviceSelect);
	return 0;
}

/*
 * Translate the given offset into the appropriate command and offset.
 * This does the mapping using the 16bit interleave layout defined by
 * M-Systems, and looks like this for a sector pair:
 *  +-----------+-------+-------+-------+--------------+---------+-----------+
 *  | 0 --- 511 |512-517|518-519|520-521| 522 --- 1033 |1034-1039|1040 - 1055|
 *  +-----------+-------+-------+-------+--------------+---------+-----------+
 *  | Data 0    | ECC 0 |Flags0 |Flags1 | Data 1       |ECC 1    | OOB 1 + 2 |
 *  +-----------+-------+-------+-------+--------------+---------+-----------+
 */
/* FIXME: This lives in INFTL not here. Other users of flash devices
   may not want it */
static unsigned int DoC_GetDataOffset(struct mtd_info *mtd, loff_t *from)
{
	struct DiskOnChip *this = mtd->priv;

	if (this->interleave) {
		unsigned int ofs = *from & 0x3ff;
		unsigned int cmd;

		if (ofs < 512) {
			cmd = NAND_CMD_READ0;
			ofs &= 0x1ff;
		} else if (ofs < 1014) {
			cmd = NAND_CMD_READ1;
			ofs = (ofs & 0x1ff) + 10;
		} else {
			cmd = NAND_CMD_READOOB;
			ofs = ofs - 1014;
		}

		*from = (*from & ~0x3ff) | ofs;
		return cmd;
	} else {
		/* No interleave */
		if ((*from) & 0x100)
			return NAND_CMD_READ1;
		return NAND_CMD_READ0;
	}
}

static unsigned int DoC_GetECCOffset(struct mtd_info *mtd, loff_t *from)
{
	unsigned int ofs, cmd;

	if (*from & 0x200) {
		cmd = NAND_CMD_READOOB;
		ofs = 10 + (*from & 0xf);
	} else {
		cmd = NAND_CMD_READ1;
		ofs = (*from & 0xf);
	}

	*from = (*from & ~0x3ff) | ofs;
	return cmd;
}

static unsigned int DoC_GetFlagsOffset(struct mtd_info *mtd, loff_t *from)
{
	unsigned int ofs, cmd;

	cmd = NAND_CMD_READ1;
	ofs = (*from & 0x200) ? 8 : 6;
	*from = (*from & ~0x3ff) | ofs;
	return cmd;
}

static unsigned int DoC_GetHdrOffset(struct mtd_info *mtd, loff_t *from)
{
	unsigned int ofs, cmd;

	cmd = NAND_CMD_READOOB;
	ofs = (*from & 0x200) ? 24 : 16;
	*from = (*from & ~0x3ff) | ofs;
	return cmd;
}

static inline void MemReadDOC(void __iomem * docptr, unsigned char *buf, int len)
{
#ifndef USE_MEMCPY
	int i;
	for (i = 0; i < len; i++)
		buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
#else
	memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len);
#endif
}

static inline void MemWriteDOC(void __iomem * docptr, unsigned char *buf, int len)
{
#ifndef USE_MEMCPY
	int i;
	for (i = 0; i < len; i++)
		WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
#else
	memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
#endif
}

/* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
{
	int mfr, id, i, j;
	volatile char dummy;
	void __iomem * docptr = doc->virtadr;

	/* Page in the required floor/chip */
	DoC_SelectFloor(docptr, floor);
	DoC_SelectChip(docptr, chip);

	/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
	WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);

	/* Reset the chip, see Software Requirement 11.4 item 1. */
	DoC_Command(docptr, NAND_CMD_RESET, 0);
	DoC_WaitReady(docptr);

	/* Read the NAND chip ID: 1. Send ReadID command */
	DoC_Command(docptr, NAND_CMD_READID, 0);

	/* Read the NAND chip ID: 2. Send address byte zero */
	DoC_Address(doc, 1, 0x00, 0, 0x00);

	WriteDOC(0, docptr, Mplus_FlashControl);
	DoC_WaitReady(docptr);

	/* Read the manufacturer and device id codes of the flash device through
	   CDSN IO register see Software Requirement 11.4 item 5.*/
	dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
	dummy = ReadDOC(docptr, Mplus_ReadPipeInit);

	mfr = ReadDOC(docptr, Mil_CDSN_IO);
	if (doc->interleave)
		dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */

	id  = ReadDOC(docptr, Mil_CDSN_IO);
	if (doc->interleave)
		dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */

	dummy = ReadDOC(docptr, Mplus_LastDataRead);
	dummy = ReadDOC(docptr, Mplus_LastDataRead);

	/* Disable flash internally */
	WriteDOC(0, docptr, Mplus_FlashSelect);

	/* No response - return failure */
	if (mfr == 0xff || mfr == 0)
		return 0;

	for (i = 0; nand_flash_ids[i].name != NULL; i++) {
		if (id == nand_flash_ids[i].id) {
			/* Try to identify manufacturer */
			for (j = 0; nand_manuf_ids[j].id != 0x0; j++) {
				if (nand_manuf_ids[j].id == mfr)
					break;
			}
			printk(KERN_INFO "Flash chip found: Manufacturer ID: %2.2X, "
			       "Chip ID: %2.2X (%s:%s)\n", mfr, id,
			       nand_manuf_ids[j].name, nand_flash_ids[i].name);
			doc->mfr = mfr;
			doc->id = id;
			doc->chipshift = ffs((nand_flash_ids[i].chipsize << 20)) - 1;
			doc->erasesize = nand_flash_ids[i].erasesize << doc->interleave;
			break;
		}
	}

	if (nand_flash_ids[i].name == NULL)
		return 0;
	return 1;
}

/* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
static void DoC_ScanChips(struct DiskOnChip *this)
{
	int floor, chip;
	int numchips[MAX_FLOORS_MPLUS];
	int ret;

	this->numchips = 0;
	this->mfr = 0;
	this->id = 0;

	/* Work out the intended interleave setting */
	this->interleave = 0;
	if (this->ChipID == DOC_ChipID_DocMilPlus32)
		this->interleave = 1;

	/* Check the ASIC agrees */
	if ( (this->interleave << 2) !=
	     (ReadDOC(this->virtadr, Mplus_Configuration) & 4)) {
		u_char conf = ReadDOC(this->virtadr, Mplus_Configuration);
		printk(KERN_NOTICE "Setting DiskOnChip Millennium Plus interleave to %s\n",
		       this->interleave?"on (16-bit)":"off (8-bit)");
		conf ^= 4;
		WriteDOC(conf, this->virtadr, Mplus_Configuration);
	}

	/* For each floor, find the number of valid chips it contains */
	for (floor = 0,ret = 1; floor < MAX_FLOORS_MPLUS; floor++) {
		numchips[floor] = 0;
		for (chip = 0; chip < MAX_CHIPS_MPLUS && ret != 0; chip++) {
			ret = DoC_IdentChip(this, floor, chip);
			if (ret) {
				numchips[floor]++;
				this->numchips++;
			}
		}
	}
	/* If there are none at all that we recognise, bail */
	if (!this->numchips) {
		printk("No flash chips recognised.\n");
		return;
	}

	/* Allocate an array to hold the information for each chip */
	this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL);
	if (!this->chips){
		printk("MTD: No memory for allocating chip info structures\n");
		return;
	}

	/* Fill out the chip array with {floor, chipno} for each
	 * detected chip in the device. */
	for (floor = 0, ret = 0; floor < MAX_FLOORS_MPLUS; floor++) {
		for (chip = 0 ; chip < numchips[floor] ; chip++) {
			this->chips[ret].floor = floor;
			this->chips[ret].chip = chip;
			this->chips[ret].curadr = 0;
			this->chips[ret].curmode = 0x50;
			ret++;
		}
	}

	/* Calculate and print the total size of the device */
	this->totlen = this->numchips * (1 << this->chipshift);
	printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n",
	       this->numchips ,this->totlen >> 20);
}

static int DoCMilPlus_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2)
{
	int tmp1, tmp2, retval;

	if (doc1->physadr == doc2->physadr)
		return 1;

	/* Use the alias resolution register which was set aside for this
	 * purpose. If it's value is the same on both chips, they might
	 * be the same chip, and we write to one and check for a change in
	 * the other. It's unclear if this register is usuable in the
	 * DoC 2000 (it's in the Millennium docs), but it seems to work. */
	tmp1 = ReadDOC(doc1->virtadr, Mplus_AliasResolution);
	tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution);
	if (tmp1 != tmp2)
		return 0;

	WriteDOC((tmp1+1) % 0xff, doc1->virtadr, Mplus_AliasResolution);
	tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution);
	if (tmp2 == (tmp1+1) % 0xff)
		retval = 1;
	else
		retval = 0;

	/* Restore register contents.  May not be necessary, but do it just to
	 * be safe. */
	WriteDOC(tmp1, doc1->virtadr, Mplus_AliasResolution);

	return retval;
}

/* This routine is found from the docprobe code by symbol_get(),
 * which will bump the use count of this module. */
void DoCMilPlus_init(struct mtd_info *mtd)
{
	struct DiskOnChip *this = mtd->priv;
	struct DiskOnChip *old = NULL;

	/* We must avoid being called twice for the same device. */
	if (docmilpluslist)
		old = docmilpluslist->priv;

	while (old) {
		if (DoCMilPlus_is_alias(this, old)) {
			printk(KERN_NOTICE "Ignoring DiskOnChip Millennium "
				"Plus at 0x%lX - already configured\n",
				this->physadr);
			iounmap(this->virtadr);
			kfree(mtd);
			return;
		}
		if (old->nextdoc)
			old = old->nextdoc->priv;
		else
			old = NULL;
	}

	mtd->name = "DiskOnChip Millennium Plus";
	printk(KERN_NOTICE "DiskOnChip Millennium Plus found at "
		"address 0x%lX\n", this->physadr);

	mtd->type = MTD_NANDFLASH;
	mtd->flags = MTD_CAP_NANDFLASH;
	mtd->size = 0;

	mtd->erasesize = 0;
	mtd->writesize = 512;
	mtd->oobsize = 16;
	mtd->owner = THIS_MODULE;
	mtd->erase = doc_erase;
	mtd->point = NULL;
	mtd->unpoint = NULL;
	mtd->read = doc_read;
	mtd->write = doc_write;
	mtd->read_oob = doc_read_oob;
	mtd->write_oob = doc_write_oob;
	mtd->sync = NULL;

	this->totlen = 0;
	this->numchips = 0;
	this->curfloor = -1;
	this->curchip = -1;

	/* Ident all the chips present. */
	DoC_ScanChips(this);

	if (!this->totlen) {
		kfree(mtd);
		iounmap(this->virtadr);
	} else {
		this->nextdoc = docmilpluslist;
		docmilpluslist = mtd;
		mtd->size  = this->totlen;
		mtd->erasesize = this->erasesize;
		add_mtd_device(mtd);
		return;
	}
}
EXPORT_SYMBOL_GPL(DoCMilPlus_init);

#if 0
static int doc_dumpblk(struct mtd_info *mtd, loff_t from)
{
	int i;
	loff_t fofs;
	struct DiskOnChip *this = mtd->priv;
	void __iomem * docptr = this->virtadr;
	struct Nand *mychip = &this->chips[from >> (this->chipshift)];
	unsigned char *bp, buf[1056];
	char c[32];

	from &= ~0x3ff;

	/* Don't allow read past end of device */
	if (from >= this->totlen)
		return -EINVAL;

	DoC_CheckASIC(docptr);

	/* Find the chip which is to be used and select it */
	if (this->curfloor != mychip->floor) {
		DoC_SelectFloor(docptr, mychip->floor);
		DoC_SelectChip(docptr, mychip->chip);
	} else if (this->curchip != mychip->chip) {
		DoC_SelectChip(docptr, mychip->chip);
	}
	this->curfloor = mychip->floor;
	this->curchip = mychip->chip;

	/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
	WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);

	/* Reset the chip, see Software Requirement 11.4 item 1. */
	DoC_Command(docptr, NAND_CMD_RESET, 0);
	DoC_WaitReady(docptr);

	fofs = from;
	DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);
	DoC_Address(this, 3, fofs, 0, 0x00);
	WriteDOC(0, docptr, Mplus_FlashControl);
	DoC_WaitReady(docptr);

	/* disable the ECC engine */
	WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);

	ReadDOC(docptr, Mplus_ReadPipeInit);
	ReadDOC(docptr, Mplus_ReadPipeInit);

	/* Read the data via the internal pipeline through CDSN IO
	   register, see Pipelined Read Operations 11.3 */
	MemReadDOC(docptr, buf, 1054);
	buf[1054] = ReadDOC(docptr, Mplus_LastDataRead);
	buf[1055] = ReadDOC(docptr, Mplus_LastDataRead);

	memset(&c[0], 0, sizeof(c));
	printk("DUMP OFFSET=%x:\n", (int)from);

        for (i = 0, bp = &buf[0]; (i < 1056); i++) {
                if ((i % 16) == 0)
                        printk("%08x: ", i);
                printk(" %02x", *bp);
                c[(i & 0xf)] = ((*bp >= 0x20) && (*bp <= 0x7f)) ? *bp : '.';
                bp++;
                if (((i + 1) % 16) == 0)
                        printk("    %s\n", c);
        }
	printk("\n");

	/* Disable flash internally */
	WriteDOC(0, docptr, Mplus_FlashSelect);

	return 0;
}
#endif

static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
		    size_t *retlen, u_char *buf)
{
	int ret, i;
	volatile char dummy;
	loff_t fofs;
	unsigned char syndrome[6], eccbuf[6];
	struct DiskOnChip *this = mtd->priv;
	void __iomem * docptr = this->virtadr;
	struct Nand *mychip = &this->chips[from >> (this->chipshift)];

	/* Don't allow read past end of device */
	if (from >= this->totlen)
		return -EINVAL;

	/* Don't allow a single read to cross a 512-byte block boundary */
	if (from + len > ((from | 0x1ff) + 1))
		len = ((from | 0x1ff) + 1) - from;

	DoC_CheckASIC(docptr);

	/* Find the chip which is to be used and select it */
	if (this->curfloor != mychip->floor) {
		DoC_SelectFloor(docptr, mychip->floor);
		DoC_SelectChip(docptr, mychip->chip);
	} else if (this->curchip != mychip->chip) {
		DoC_SelectChip(docptr, mychip->chip);
	}
	this->curfloor = mychip->floor;
	this->curchip = mychip->chip;

	/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
	WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);

	/* Reset the chip, see Software Requirement 11.4 item 1. */
	DoC_Command(docptr, NAND_CMD_RESET, 0);
	DoC_WaitReady(docptr);

	fofs = from;
	DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);
	DoC_Address(this, 3, fofs, 0, 0x00);
	WriteDOC(0, docptr, Mplus_FlashControl);
	DoC_WaitReady(docptr);

	/* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
	WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
	WriteDOC(DOC_ECC_EN, docptr, Mplus_ECCConf);

	/* Let the caller know we completed it */
	*retlen = len;
	ret = 0;

	ReadDOC(docptr, Mplus_ReadPipeInit);
	ReadDOC(docptr, Mplus_ReadPipeInit);

	/* Read the data via the internal pipeline through CDSN IO
	   register, see Pipelined Read Operations 11.3 */
	MemReadDOC(docptr, buf, len);

	/* Read the ECC data following raw data */
	MemReadDOC(docptr, eccbuf, 4);
	eccbuf[4] = ReadDOC(docptr, Mplus_LastDataRead);
	eccbuf[5] = ReadDOC(docptr, Mplus_LastDataRead);

	/* Flush the pipeline */
	dummy = ReadDOC(docptr, Mplus_ECCConf);
	dummy = ReadDOC(docptr, Mplus_ECCConf);

	/* Check the ECC Status */
	if (ReadDOC(docptr, Mplus_ECCConf) & 0x80) {
		int nb_errors;
		/* There was an ECC error */
#ifdef ECC_DEBUG
		printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);
#endif
		/* Read the ECC syndrom through the DiskOnChip ECC logic.
		   These syndrome will be all ZERO when there is no error */
		for (i = 0; i < 6; i++)
			syndrome[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i);

		nb_errors = doc_decode_ecc(buf, syndrome);
#ifdef ECC_DEBUG
		printk("ECC Errors corrected: %x\n", nb_errors);
#endif
		if (nb_errors < 0) {
			/* We return error, but have actually done the
			   read. Not that this can be told to user-space, via
			   sys_read(), but at least MTD-aware stuff can know
			   about it by checking *retlen */
#ifdef ECC_DEBUG
			printk("%s(%d): Millennium Plus ECC error (from=0x%x:\n",
				__FILE__, __LINE__, (int)from);
			printk("        syndrome= %02x:%02x:%02x:%02x:%02x:"
				"%02x\n",
				syndrome[0], syndrome[1], syndrome[2],
				syndrome[3], syndrome[4], syndrome[5]);
			printk("          eccbuf= %02x:%02x:%02x:%02x:%02x:"
				"%02x\n",
				eccbuf[0], eccbuf[1], eccbuf[2],
				eccbuf[3], eccbuf[4], eccbuf[5]);
#endif
				ret = -EIO;
		}
	}

#ifdef PSYCHO_DEBUG
	printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
	       (long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
	       eccbuf[4], eccbuf[5]);
#endif
	/* disable the ECC engine */
	WriteDOC(DOC_ECC_DIS, docptr , Mplus_ECCConf);

	/* Disable flash internally */
	WriteDOC(0, docptr, Mplus_FlashSelect);

	return ret;
}

static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
		     size_t *retlen, const u_char *buf)
{
	int i, before, ret = 0;
	loff_t fto;
	volatile char dummy;
	char eccbuf[6];
	struct DiskOnChip *this = mtd->priv;
	void __iomem * docptr = this->virtadr;
	struct Nand *mychip = &this->chips[to >> (this->chipshift)];

	/* Don't allow write past end of device */
	if (to >= this->totlen)
		return -EINVAL;

	/* Don't allow writes which aren't exactly one block (512 bytes) */
	if ((to & 0x1ff) || (len != 0x200))
		return -EINVAL;

	/* Determine position of OOB flags, before or after data */
	before = (this->interleave && (to & 0x200));

	DoC_CheckASIC(docptr);

	/* Find the chip which is to be used and select it */
	if (this->curfloor != mychip->floor) {
		DoC_SelectFloor(docptr, mychip->floor);
		DoC_SelectChip(docptr, mychip->chip);
	} else if (this->curchip != mychip->chip) {
		DoC_SelectChip(docptr, mychip->chip);
	}
	this->curfloor = mychip->floor;
	this->curchip = mychip->chip;

	/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
	WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);

	/* Reset the chip, see Software Requirement 11.4 item 1. */
	DoC_Command(docptr, NAND_CMD_RESET, 0);
	DoC_WaitReady(docptr);

	/* Set device to appropriate plane of flash */
	fto = to;
	WriteDOC(DoC_GetDataOffset(mtd, &fto), docptr, Mplus_FlashCmd);

	/* On interleaved devices the flags for 2nd half 512 are before data */
	if (eccbuf && before)
		fto -= 2;

	/* issue the Serial Data In command to initial the Page Program process */
	DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
	DoC_Address(this, 3, fto, 0x00, 0x00);

	/* Disable the ECC engine */
	WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);

	if (before) {
		/* Write the block status BLOCK_USED (0x5555) */
		WriteDOC(0x55, docptr, Mil_CDSN_IO);
		WriteDOC(0x55, docptr, Mil_CDSN_IO);
	}

	/* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
	WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, Mplus_ECCConf);

	MemWriteDOC(docptr, (unsigned char *) buf, len);

	/* Write ECC data to flash, the ECC info is generated by
	   the DiskOnChip ECC logic see Reed-Solomon EDC/ECC 11.1 */
	DoC_Delay(docptr, 3);

	/* Read the ECC data through the DiskOnChip ECC logic */
	for (i = 0; i < 6; i++)
		eccbuf[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i);

	/* disable the ECC engine */
	WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);

	/* Write the ECC data to flash */
	MemWriteDOC(docptr, eccbuf, 6);

	if (!before) {
		/* Write the block status BLOCK_USED (0x5555) */
		WriteDOC(0x55, docptr, Mil_CDSN_IO+6);
		WriteDOC(0x55, docptr, Mil_CDSN_IO+7);
	}

#ifdef PSYCHO_DEBUG
	printk("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
	       (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
	       eccbuf[4], eccbuf[5]);
#endif

	WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
	WriteDOC(0x00, docptr, Mplus_WritePipeTerm);

	/* Commit the Page Program command and wait for ready
	   see Software Requirement 11.4 item 1.*/
	DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
	DoC_WaitReady(docptr);

	/* Read the status of the flash device through CDSN IO register
	   see Software Requirement 11.4 item 5.*/
	DoC_Command(docptr, NAND_CMD_STATUS, 0);
	dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
	dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
	DoC_Delay(docptr, 2);
	if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
		printk("MTD: Error 0x%x programming at 0x%x\n", dummy, (int)to);
		/* Error in programming
		   FIXME: implement Bad Block Replacement (in nftl.c ??) */
		*retlen = 0;
		ret = -EIO;
	}
	dummy = ReadDOC(docptr, Mplus_LastDataRead);

	/* Disable flash internally */
	WriteDOC(0, docptr, Mplus_FlashSelect);

	/* Let the caller know we completed it */
	*retlen = len;

	return ret;
}

static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
			struct mtd_oob_ops *ops)
{
	loff_t fofs, base;
	struct DiskOnChip *this = mtd->priv;
	void __iomem * docptr = this->virtadr;
	struct Nand *mychip = &this->chips[ofs >> this->chipshift];
	size_t i, size, got, want;
	uint8_t *buf = ops->oobbuf;
	size_t len = ops->len;

	BUG_ON(ops->mode != MTD_OOB_PLACE);

	ofs += ops->ooboffs;

	DoC_CheckASIC(docptr);

	/* Find the chip which is to be used and select it */
	if (this->curfloor != mychip->floor) {
		DoC_SelectFloor(docptr, mychip->floor);
		DoC_SelectChip(docptr, mychip->chip);
	} else if (this->curchip != mychip->chip) {
		DoC_SelectChip(docptr, mychip->chip);
	}
	this->curfloor = mychip->floor;
	this->curchip = mychip->chip;

	/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
	WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);

	/* disable the ECC engine */
	WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
	DoC_WaitReady(docptr);

	/* Maximum of 16 bytes in the OOB region, so limit read to that */
	if (len > 16)
		len = 16;
	got = 0;
	want = len;

	for (i = 0; ((i < 3) && (want > 0)); i++) {
		/* Figure out which region we are accessing... */
		fofs = ofs;
		base = ofs & 0xf;
		if (!this->interleave) {
			DoC_Command(docptr, NAND_CMD_READOOB, 0);
			size = 16 - base;
		} else if (base < 6) {
			DoC_Command(docptr, DoC_GetECCOffset(mtd, &fofs), 0);
			size = 6 - base;
		} else if (base < 8) {
			DoC_Command(docptr, DoC_GetFlagsOffset(mtd, &fofs), 0);
			size = 8 - base;
		} else {
			DoC_Command(docptr, DoC_GetHdrOffset(mtd, &fofs), 0);
			size = 16 - base;
		}
		if (size > want)
			size = want;

		/* Issue read command */
		DoC_Address(this, 3, fofs, 0, 0x00);
		WriteDOC(0, docptr, Mplus_FlashControl);
		DoC_WaitReady(docptr);

		ReadDOC(docptr, Mplus_ReadPipeInit);
		ReadDOC(docptr, Mplus_ReadPipeInit);
		MemReadDOC(docptr, &buf[got], size - 2);
		buf[got + size - 2] = ReadDOC(docptr, Mplus_LastDataRead);
		buf[got + size - 1] = ReadDOC(docptr, Mplus_LastDataRead);

		ofs += size;
		got += size;
		want -= size;
	}

	/* Disable flash internally */
	WriteDOC(0, docptr, Mplus_FlashSelect);

	ops->retlen = len;
	return 0;
}

static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
			 struct mtd_oob_ops *ops)
{
	volatile char dummy;
	loff_t fofs, base;
	struct DiskOnChip *this = mtd->priv;
	void __iomem * docptr = this->virtadr;
	struct Nand *mychip = &this->chips[ofs >> this->chipshift];
	size_t i, size, got, want;
	int ret = 0;
	uint8_t *buf = ops->oobbuf;
	size_t len = ops->len;

	BUG_ON(ops->mode != MTD_OOB_PLACE);

	ofs += ops->ooboffs;

	DoC_CheckASIC(docptr);

	/* Find the chip which is to be used and select it */
	if (this->curfloor != mychip->floor) {
		DoC_SelectFloor(docptr, mychip->floor);
		DoC_SelectChip(docptr, mychip->chip);
	} else if (this->curchip != mychip->chip) {
		DoC_SelectChip(docptr, mychip->chip);
	}
	this->curfloor = mychip->floor;
	this->curchip = mychip->chip;

	/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
	WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);


	/* Maximum of 16 bytes in the OOB region, so limit write to that */
	if (len > 16)
		len = 16;
	got = 0;
	want = len;

	for (i = 0; ((i < 3) && (want > 0)); i++) {
		/* Reset the chip, see Software Requirement 11.4 item 1. */
		DoC_Command(docptr, NAND_CMD_RESET, 0);
		DoC_WaitReady(docptr);

		/* Figure out which region we are accessing... */
		fofs = ofs;
		base = ofs & 0x0f;
		if (!this->interleave) {
			WriteDOC(NAND_CMD_READOOB, docptr, Mplus_FlashCmd);
			size = 16 - base;
		} else if (base < 6) {
			WriteDOC(DoC_GetECCOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
			size = 6 - base;
		} else if (base < 8) {
			WriteDOC(DoC_GetFlagsOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
			size = 8 - base;
		} else {
			WriteDOC(DoC_GetHdrOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
			size = 16 - base;
		}
		if (size > want)
			size = want;

		/* Issue the Serial Data In command to initial the Page Program process */
		DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
		DoC_Address(this, 3, fofs, 0, 0x00);

		/* Disable the ECC engine */
		WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);

		/* Write the data via the internal pipeline through CDSN IO
		   register, see Pipelined Write Operations 11.2 */
		MemWriteDOC(docptr, (unsigned char *) &buf[got], size);
		WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
		WriteDOC(0x00, docptr, Mplus_WritePipeTerm);

		/* Commit the Page Program command and wait for ready
	 	   see Software Requirement 11.4 item 1.*/
		DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
		DoC_WaitReady(docptr);

		/* Read the status of the flash device through CDSN IO register
		   see Software Requirement 11.4 item 5.*/
		DoC_Command(docptr, NAND_CMD_STATUS, 0x00);
		dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
		dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
		DoC_Delay(docptr, 2);
		if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
			printk("MTD: Error 0x%x programming oob at 0x%x\n",
				dummy, (int)ofs);
			/* FIXME: implement Bad Block Replacement */
			ops->retlen = 0;
			ret = -EIO;
		}
		dummy = ReadDOC(docptr, Mplus_LastDataRead);

		ofs += size;
		got += size;
		want -= size;
	}

	/* Disable flash internally */
	WriteDOC(0, docptr, Mplus_FlashSelect);

	ops->retlen = len;
	return ret;
}

int doc_erase(struct mtd_info *mtd, struct erase_info *instr)
{
	volatile char dummy;
	struct DiskOnChip *this = mtd->priv;
	__u32 ofs = instr->addr;
	__u32 len = instr->len;
	void __iomem * docptr = this->virtadr;
	struct Nand *mychip = &this->chips[ofs >> this->chipshift];

	DoC_CheckASIC(docptr);

	if (len != mtd->erasesize)
		printk(KERN_WARNING "MTD: Erase not right size (%x != %x)n",
		       len, mtd->erasesize);

	/* Find the chip which is to be used and select it */
	if (this->curfloor != mychip->floor) {
		DoC_SelectFloor(docptr, mychip->floor);
		DoC_SelectChip(docptr, mychip->chip);
	} else if (this->curchip != mychip->chip) {
		DoC_SelectChip(docptr, mychip->chip);
	}
	this->curfloor = mychip->floor;
	this->curchip = mychip->chip;

	instr->state = MTD_ERASE_PENDING;

	/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
	WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);

	DoC_Command(docptr, NAND_CMD_RESET, 0x00);
	DoC_WaitReady(docptr);

	DoC_Command(docptr, NAND_CMD_ERASE1, 0);
	DoC_Address(this, 2, ofs, 0, 0x00);
	DoC_Command(docptr, NAND_CMD_ERASE2, 0);
	DoC_WaitReady(docptr);
	instr->state = MTD_ERASING;

	/* Read the status of the flash device through CDSN IO register
	   see Software Requirement 11.4 item 5. */
	DoC_Command(docptr, NAND_CMD_STATUS, 0);
	dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
	dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
	if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
		printk("MTD: Error 0x%x erasing at 0x%x\n", dummy, ofs);
		/* FIXME: implement Bad Block Replacement (in nftl.c ??) */
		instr->state = MTD_ERASE_FAILED;
	} else {
		instr->state = MTD_ERASE_DONE;
	}
	dummy = ReadDOC(docptr, Mplus_LastDataRead);

	/* Disable flash internally */
	WriteDOC(0, docptr, Mplus_FlashSelect);

	mtd_erase_callback(instr);

	return 0;
}

/****************************************************************************
 *
 * Module stuff
 *
 ****************************************************************************/

static void __exit cleanup_doc2001plus(void)
{
	struct mtd_info *mtd;
	struct DiskOnChip *this;

	while ((mtd=docmilpluslist)) {
		this = mtd->priv;
		docmilpluslist = this->nextdoc;

		del_mtd_device(mtd);

		iounmap(this->virtadr);
		kfree(this->chips);
		kfree(mtd);
	}
}

module_exit(cleanup_doc2001plus);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com> et al.");
MODULE_DESCRIPTION("Driver for DiskOnChip Millennium Plus");
OpenPOWER on IntegriCloud