summaryrefslogtreecommitdiff
path: root/drivers/mtd/nand/bf5xx_nand.c
blob: 9af2a2cc1153adf36c51da04ea6b5ce7f765753c (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
/* linux/drivers/mtd/nand/bf5xx_nand.c
 *
 * Copyright 2006-2008 Analog Devices Inc.
 *	http://blackfin.uclinux.org/
 *	Bryan Wu <bryan.wu@analog.com>
 *
 * Blackfin BF5xx on-chip NAND flash controller driver
 *
 * Derived from drivers/mtd/nand/s3c2410.c
 * Copyright (c) 2007 Ben Dooks <ben@simtec.co.uk>
 *
 * Derived from drivers/mtd/nand/cafe.c
 * Copyright © 2006 Red Hat, Inc.
 * Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
 *
 * Changelog:
 *	12-Jun-2007  Bryan Wu:  Initial version
 *	18-Jul-2007  Bryan Wu:
 *		- ECC_HW and ECC_SW supported
 *		- DMA supported in ECC_HW
 *		- YAFFS tested as rootfs in both ECC_HW and ECC_SW
 *
 * TODO:
 * 	Enable JFFS2 over NAND as rootfs
 *
 * 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/bitops.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/mtd/partitions.h>

#include <asm/blackfin.h>
#include <asm/dma.h>
#include <asm/cacheflush.h>
#include <asm/nand.h>
#include <asm/portmux.h>

#define DRV_NAME	"bf5xx-nand"
#define DRV_VERSION	"1.2"
#define DRV_AUTHOR	"Bryan Wu <bryan.wu@analog.com>"
#define DRV_DESC	"BF5xx on-chip NAND FLash Controller Driver"

#ifdef CONFIG_MTD_NAND_BF5XX_HWECC
static int hardware_ecc = 1;
#else
static int hardware_ecc;
#endif

static const unsigned short bfin_nfc_pin_req[] =
	{P_NAND_CE,
	 P_NAND_RB,
	 P_NAND_D0,
	 P_NAND_D1,
	 P_NAND_D2,
	 P_NAND_D3,
	 P_NAND_D4,
	 P_NAND_D5,
	 P_NAND_D6,
	 P_NAND_D7,
	 P_NAND_WE,
	 P_NAND_RE,
	 P_NAND_CLE,
	 P_NAND_ALE,
	 0};

#ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
static uint8_t bbt_pattern[] = { 0xff };

static struct nand_bbt_descr bootrom_bbt = {
	.options = 0,
	.offs = 63,
	.len = 1,
	.pattern = bbt_pattern,
};

static struct nand_ecclayout bootrom_ecclayout = {
	.eccbytes = 24,
	.eccpos = {
		0x8 * 0, 0x8 * 0 + 1, 0x8 * 0 + 2,
		0x8 * 1, 0x8 * 1 + 1, 0x8 * 1 + 2,
		0x8 * 2, 0x8 * 2 + 1, 0x8 * 2 + 2,
		0x8 * 3, 0x8 * 3 + 1, 0x8 * 3 + 2,
		0x8 * 4, 0x8 * 4 + 1, 0x8 * 4 + 2,
		0x8 * 5, 0x8 * 5 + 1, 0x8 * 5 + 2,
		0x8 * 6, 0x8 * 6 + 1, 0x8 * 6 + 2,
		0x8 * 7, 0x8 * 7 + 1, 0x8 * 7 + 2
	},
	.oobfree = {
		{ 0x8 * 0 + 3, 5 },
		{ 0x8 * 1 + 3, 5 },
		{ 0x8 * 2 + 3, 5 },
		{ 0x8 * 3 + 3, 5 },
		{ 0x8 * 4 + 3, 5 },
		{ 0x8 * 5 + 3, 5 },
		{ 0x8 * 6 + 3, 5 },
		{ 0x8 * 7 + 3, 5 },
	}
};
#endif

/*
 * Data structures for bf5xx nand flash controller driver
 */

/* bf5xx nand info */
struct bf5xx_nand_info {
	/* mtd info */
	struct nand_hw_control		controller;
	struct mtd_info			mtd;
	struct nand_chip		chip;

	/* platform info */
	struct bf5xx_nand_platform	*platform;

	/* device info */
	struct device			*device;

	/* DMA stuff */
	struct completion		dma_completion;
};

/*
 * Conversion functions
 */
static struct bf5xx_nand_info *mtd_to_nand_info(struct mtd_info *mtd)
{
	return container_of(mtd, struct bf5xx_nand_info, mtd);
}

static struct bf5xx_nand_info *to_nand_info(struct platform_device *pdev)
{
	return platform_get_drvdata(pdev);
}

static struct bf5xx_nand_platform *to_nand_plat(struct platform_device *pdev)
{
	return pdev->dev.platform_data;
}

/*
 * struct nand_chip interface function pointers
 */

/*
 * bf5xx_nand_hwcontrol
 *
 * Issue command and address cycles to the chip
 */
static void bf5xx_nand_hwcontrol(struct mtd_info *mtd, int cmd,
				   unsigned int ctrl)
{
	if (cmd == NAND_CMD_NONE)
		return;

	while (bfin_read_NFC_STAT() & WB_FULL)
		cpu_relax();

	if (ctrl & NAND_CLE)
		bfin_write_NFC_CMD(cmd);
	else
		bfin_write_NFC_ADDR(cmd);
	SSYNC();
}

/*
 * bf5xx_nand_devready()
 *
 * returns 0 if the nand is busy, 1 if it is ready
 */
static int bf5xx_nand_devready(struct mtd_info *mtd)
{
	unsigned short val = bfin_read_NFC_IRQSTAT();

	if ((val & NBUSYIRQ) == NBUSYIRQ)
		return 1;
	else
		return 0;
}

/*
 * ECC functions
 * These allow the bf5xx to use the controller's ECC
 * generator block to ECC the data as it passes through
 */

/*
 * ECC error correction function
 */
static int bf5xx_nand_correct_data_256(struct mtd_info *mtd, u_char *dat,
					u_char *read_ecc, u_char *calc_ecc)
{
	struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
	u32 syndrome[5];
	u32 calced, stored;
	int i;
	unsigned short failing_bit, failing_byte;
	u_char data;

	calced = calc_ecc[0] | (calc_ecc[1] << 8) | (calc_ecc[2] << 16);
	stored = read_ecc[0] | (read_ecc[1] << 8) | (read_ecc[2] << 16);

	syndrome[0] = (calced ^ stored);

	/*
	 * syndrome 0: all zero
	 * No error in data
	 * No action
	 */
	if (!syndrome[0] || !calced || !stored)
		return 0;

	/*
	 * sysdrome 0: only one bit is one
	 * ECC data was incorrect
	 * No action
	 */
	if (hweight32(syndrome[0]) == 1) {
		dev_err(info->device, "ECC data was incorrect!\n");
		return 1;
	}

	syndrome[1] = (calced & 0x7FF) ^ (stored & 0x7FF);
	syndrome[2] = (calced & 0x7FF) ^ ((calced >> 11) & 0x7FF);
	syndrome[3] = (stored & 0x7FF) ^ ((stored >> 11) & 0x7FF);
	syndrome[4] = syndrome[2] ^ syndrome[3];

	for (i = 0; i < 5; i++)
		dev_info(info->device, "syndrome[%d] 0x%08x\n", i, syndrome[i]);

	dev_info(info->device,
		"calced[0x%08x], stored[0x%08x]\n",
		calced, stored);

	/*
	 * sysdrome 0: exactly 11 bits are one, each parity
	 * and parity' pair is 1 & 0 or 0 & 1.
	 * 1-bit correctable error
	 * Correct the error
	 */
	if (hweight32(syndrome[0]) == 11 && syndrome[4] == 0x7FF) {
		dev_info(info->device,
			"1-bit correctable error, correct it.\n");
		dev_info(info->device,
			"syndrome[1] 0x%08x\n", syndrome[1]);

		failing_bit = syndrome[1] & 0x7;
		failing_byte = syndrome[1] >> 0x3;
		data = *(dat + failing_byte);
		data = data ^ (0x1 << failing_bit);
		*(dat + failing_byte) = data;

		return 0;
	}

	/*
	 * sysdrome 0: random data
	 * More than 1-bit error, non-correctable error
	 * Discard data, mark bad block
	 */
	dev_err(info->device,
		"More than 1-bit error, non-correctable error.\n");
	dev_err(info->device,
		"Please discard data, mark bad block\n");

	return 1;
}

static int bf5xx_nand_correct_data(struct mtd_info *mtd, u_char *dat,
					u_char *read_ecc, u_char *calc_ecc)
{
	struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
	struct bf5xx_nand_platform *plat = info->platform;
	unsigned short page_size = (plat->page_size ? 512 : 256);
	int ret;

	ret = bf5xx_nand_correct_data_256(mtd, dat, read_ecc, calc_ecc);

	/* If page size is 512, correct second 256 bytes */
	if (page_size == 512) {
		dat += 256;
		read_ecc += 8;
		calc_ecc += 8;
		ret |= bf5xx_nand_correct_data_256(mtd, dat, read_ecc, calc_ecc);
	}

	return ret;
}

static void bf5xx_nand_enable_hwecc(struct mtd_info *mtd, int mode)
{
	return;
}

static int bf5xx_nand_calculate_ecc(struct mtd_info *mtd,
		const u_char *dat, u_char *ecc_code)
{
	struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
	struct bf5xx_nand_platform *plat = info->platform;
	u16 page_size = (plat->page_size ? 512 : 256);
	u16 ecc0, ecc1;
	u32 code[2];
	u8 *p;

	/* first 4 bytes ECC code for 256 page size */
	ecc0 = bfin_read_NFC_ECC0();
	ecc1 = bfin_read_NFC_ECC1();

	code[0] = (ecc0 & 0x7ff) | ((ecc1 & 0x7ff) << 11);

	dev_dbg(info->device, "returning ecc 0x%08x\n", code[0]);

	/* first 3 bytes in ecc_code for 256 page size */
	p = (u8 *) code;
	memcpy(ecc_code, p, 3);

	/* second 4 bytes ECC code for 512 page size */
	if (page_size == 512) {
		ecc0 = bfin_read_NFC_ECC2();
		ecc1 = bfin_read_NFC_ECC3();
		code[1] = (ecc0 & 0x7ff) | ((ecc1 & 0x7ff) << 11);

		/* second 3 bytes in ecc_code for second 256
		 * bytes of 512 page size
		 */
		p = (u8 *) (code + 1);
		memcpy((ecc_code + 3), p, 3);
		dev_dbg(info->device, "returning ecc 0x%08x\n", code[1]);
	}

	return 0;
}

/*
 * PIO mode for buffer writing and reading
 */
static void bf5xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
	int i;
	unsigned short val;

	/*
	 * Data reads are requested by first writing to NFC_DATA_RD
	 * and then reading back from NFC_READ.
	 */
	for (i = 0; i < len; i++) {
		while (bfin_read_NFC_STAT() & WB_FULL)
			cpu_relax();

		/* Contents do not matter */
		bfin_write_NFC_DATA_RD(0x0000);
		SSYNC();

		while ((bfin_read_NFC_IRQSTAT() & RD_RDY) != RD_RDY)
			cpu_relax();

		buf[i] = bfin_read_NFC_READ();

		val = bfin_read_NFC_IRQSTAT();
		val |= RD_RDY;
		bfin_write_NFC_IRQSTAT(val);
		SSYNC();
	}
}

static uint8_t bf5xx_nand_read_byte(struct mtd_info *mtd)
{
	uint8_t val;

	bf5xx_nand_read_buf(mtd, &val, 1);

	return val;
}

static void bf5xx_nand_write_buf(struct mtd_info *mtd,
				const uint8_t *buf, int len)
{
	int i;

	for (i = 0; i < len; i++) {
		while (bfin_read_NFC_STAT() & WB_FULL)
			cpu_relax();

		bfin_write_NFC_DATA_WR(buf[i]);
		SSYNC();
	}
}

static void bf5xx_nand_read_buf16(struct mtd_info *mtd, uint8_t *buf, int len)
{
	int i;
	u16 *p = (u16 *) buf;
	len >>= 1;

	/*
	 * Data reads are requested by first writing to NFC_DATA_RD
	 * and then reading back from NFC_READ.
	 */
	bfin_write_NFC_DATA_RD(0x5555);

	SSYNC();

	for (i = 0; i < len; i++)
		p[i] = bfin_read_NFC_READ();
}

static void bf5xx_nand_write_buf16(struct mtd_info *mtd,
				const uint8_t *buf, int len)
{
	int i;
	u16 *p = (u16 *) buf;
	len >>= 1;

	for (i = 0; i < len; i++)
		bfin_write_NFC_DATA_WR(p[i]);

	SSYNC();
}

/*
 * DMA functions for buffer writing and reading
 */
static irqreturn_t bf5xx_nand_dma_irq(int irq, void *dev_id)
{
	struct bf5xx_nand_info *info = dev_id;

	clear_dma_irqstat(CH_NFC);
	disable_dma(CH_NFC);
	complete(&info->dma_completion);

	return IRQ_HANDLED;
}

static int bf5xx_nand_dma_rw(struct mtd_info *mtd,
				uint8_t *buf, int is_read)
{
	struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
	struct bf5xx_nand_platform *plat = info->platform;
	unsigned short page_size = (plat->page_size ? 512 : 256);
	unsigned short val;

	dev_dbg(info->device, " mtd->%p, buf->%p, is_read %d\n",
			mtd, buf, is_read);

	/*
	 * Before starting a dma transfer, be sure to invalidate/flush
	 * the cache over the address range of your DMA buffer to
	 * prevent cache coherency problems. Otherwise very subtle bugs
	 * can be introduced to your driver.
	 */
	if (is_read)
		invalidate_dcache_range((unsigned int)buf,
				(unsigned int)(buf + page_size));
	else
		flush_dcache_range((unsigned int)buf,
				(unsigned int)(buf + page_size));

	/*
	 * This register must be written before each page is
	 * transferred to generate the correct ECC register
	 * values.
	 */
	bfin_write_NFC_RST(0x1);
	SSYNC();

	disable_dma(CH_NFC);
	clear_dma_irqstat(CH_NFC);

	/* setup DMA register with Blackfin DMA API */
	set_dma_config(CH_NFC, 0x0);
	set_dma_start_addr(CH_NFC, (unsigned long) buf);
	set_dma_x_count(CH_NFC, (page_size >> 2));
	set_dma_x_modify(CH_NFC, 4);

	/* setup write or read operation */
	val = DI_EN | WDSIZE_32;
	if (is_read)
		val |= WNR;
	set_dma_config(CH_NFC, val);
	enable_dma(CH_NFC);

	/* Start PAGE read/write operation */
	if (is_read)
		bfin_write_NFC_PGCTL(0x1);
	else
		bfin_write_NFC_PGCTL(0x2);
	wait_for_completion(&info->dma_completion);

	return 0;
}

static void bf5xx_nand_dma_read_buf(struct mtd_info *mtd,
					uint8_t *buf, int len)
{
	struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
	struct bf5xx_nand_platform *plat = info->platform;
	unsigned short page_size = (plat->page_size ? 512 : 256);

	dev_dbg(info->device, "mtd->%p, buf->%p, int %d\n", mtd, buf, len);

	if (len == page_size)
		bf5xx_nand_dma_rw(mtd, buf, 1);
	else
		bf5xx_nand_read_buf(mtd, buf, len);
}

static void bf5xx_nand_dma_write_buf(struct mtd_info *mtd,
				const uint8_t *buf, int len)
{
	struct bf5xx_nand_info *info = mtd_to_nand_info(mtd);
	struct bf5xx_nand_platform *plat = info->platform;
	unsigned short page_size = (plat->page_size ? 512 : 256);

	dev_dbg(info->device, "mtd->%p, buf->%p, len %d\n", mtd, buf, len);

	if (len == page_size)
		bf5xx_nand_dma_rw(mtd, (uint8_t *)buf, 0);
	else
		bf5xx_nand_write_buf(mtd, buf, len);
}

/*
 * System initialization functions
 */
static int bf5xx_nand_dma_init(struct bf5xx_nand_info *info)
{
	int ret;
	unsigned short val;

	/* Do not use dma */
	if (!hardware_ecc)
		return 0;

	init_completion(&info->dma_completion);

#ifdef CONFIG_BF54x
	/* Setup DMAC1 channel mux for NFC which shared with SDH */
	val = bfin_read_DMAC1_PERIMUX();
	val &= 0xFFFE;
	bfin_write_DMAC1_PERIMUX(val);
	SSYNC();
#endif
	/* Request NFC DMA channel */
	ret = request_dma(CH_NFC, "BF5XX NFC driver");
	if (ret < 0) {
		dev_err(info->device, " unable to get DMA channel\n");
		return ret;
	}

	set_dma_callback(CH_NFC, (void *) bf5xx_nand_dma_irq, (void *) info);

	/* Turn off the DMA channel first */
	disable_dma(CH_NFC);
	return 0;
}

static void bf5xx_nand_dma_remove(struct bf5xx_nand_info *info)
{
	/* Free NFC DMA channel */
	if (hardware_ecc)
		free_dma(CH_NFC);
}

/*
 * BF5XX NFC hardware initialization
 *  - pin mux setup
 *  - clear interrupt status
 */
static int bf5xx_nand_hw_init(struct bf5xx_nand_info *info)
{
	int err = 0;
	unsigned short val;
	struct bf5xx_nand_platform *plat = info->platform;

	/* setup NFC_CTL register */
	dev_info(info->device,
		"page_size=%d, data_width=%d, wr_dly=%d, rd_dly=%d\n",
		(plat->page_size ? 512 : 256),
		(plat->data_width ? 16 : 8),
		plat->wr_dly, plat->rd_dly);

	val = (plat->page_size << NFC_PG_SIZE_OFFSET) |
		(plat->data_width << NFC_NWIDTH_OFFSET) |
		(plat->rd_dly << NFC_RDDLY_OFFSET) |
		(plat->rd_dly << NFC_WRDLY_OFFSET);
	dev_dbg(info->device, "NFC_CTL is 0x%04x\n", val);

	bfin_write_NFC_CTL(val);
	SSYNC();

	/* clear interrupt status */
	bfin_write_NFC_IRQMASK(0x0);
	SSYNC();
	val = bfin_read_NFC_IRQSTAT();
	bfin_write_NFC_IRQSTAT(val);
	SSYNC();

	/* DMA initialization  */
	if (bf5xx_nand_dma_init(info))
		err = -ENXIO;

	return err;
}

/*
 * Device management interface
 */
static int bf5xx_nand_add_partition(struct bf5xx_nand_info *info)
{
	struct mtd_info *mtd = &info->mtd;

#ifdef CONFIG_MTD_PARTITIONS
	struct mtd_partition *parts = info->platform->partitions;
	int nr = info->platform->nr_partitions;

	return add_mtd_partitions(mtd, parts, nr);
#else
	return add_mtd_device(mtd);
#endif
}

static int __devexit bf5xx_nand_remove(struct platform_device *pdev)
{
	struct bf5xx_nand_info *info = to_nand_info(pdev);
	struct mtd_info *mtd = NULL;

	platform_set_drvdata(pdev, NULL);

	/* first thing we need to do is release all our mtds
	 * and their partitions, then go through freeing the
	 * resources used
	 */
	mtd = &info->mtd;
	if (mtd) {
		nand_release(mtd);
		kfree(mtd);
	}

	peripheral_free_list(bfin_nfc_pin_req);
	bf5xx_nand_dma_remove(info);

	/* free the common resources */
	kfree(info);

	return 0;
}

/*
 * bf5xx_nand_probe
 *
 * called by device layer when it finds a device matching
 * one our driver can handled. This code checks to see if
 * it can allocate all necessary resources then calls the
 * nand layer to look for devices
 */
static int __devinit bf5xx_nand_probe(struct platform_device *pdev)
{
	struct bf5xx_nand_platform *plat = to_nand_plat(pdev);
	struct bf5xx_nand_info *info = NULL;
	struct nand_chip *chip = NULL;
	struct mtd_info *mtd = NULL;
	int err = 0;

	dev_dbg(&pdev->dev, "(%p)\n", pdev);

	if (!plat) {
		dev_err(&pdev->dev, "no platform specific information\n");
		return -EINVAL;
	}

	if (peripheral_request_list(bfin_nfc_pin_req, DRV_NAME)) {
		dev_err(&pdev->dev, "requesting Peripherals failed\n");
		return -EFAULT;
	}

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (info == NULL) {
		dev_err(&pdev->dev, "no memory for flash info\n");
		err = -ENOMEM;
		goto out_err_kzalloc;
	}

	platform_set_drvdata(pdev, info);

	spin_lock_init(&info->controller.lock);
	init_waitqueue_head(&info->controller.wq);

	info->device     = &pdev->dev;
	info->platform   = plat;

	/* initialise chip data struct */
	chip = &info->chip;

	if (plat->data_width)
		chip->options |= NAND_BUSWIDTH_16;

	chip->options |= NAND_CACHEPRG | NAND_SKIP_BBTSCAN;

	chip->read_buf = (plat->data_width) ?
		bf5xx_nand_read_buf16 : bf5xx_nand_read_buf;
	chip->write_buf = (plat->data_width) ?
		bf5xx_nand_write_buf16 : bf5xx_nand_write_buf;

	chip->read_byte    = bf5xx_nand_read_byte;

	chip->cmd_ctrl     = bf5xx_nand_hwcontrol;
	chip->dev_ready    = bf5xx_nand_devready;

	chip->priv	   = &info->mtd;
	chip->controller   = &info->controller;

	chip->IO_ADDR_R    = (void __iomem *) NFC_READ;
	chip->IO_ADDR_W    = (void __iomem *) NFC_DATA_WR;

	chip->chip_delay   = 0;

	/* initialise mtd info data struct */
	mtd 		= &info->mtd;
	mtd->priv	= chip;
	mtd->owner	= THIS_MODULE;

	/* initialise the hardware */
	err = bf5xx_nand_hw_init(info);
	if (err)
		goto out_err_hw_init;

	/* setup hardware ECC data struct */
	if (hardware_ecc) {
#ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
		chip->badblock_pattern = &bootrom_bbt;
		chip->ecc.layout = &bootrom_ecclayout;
#endif

		if (plat->page_size == NFC_PG_SIZE_256) {
			chip->ecc.bytes = 3;
			chip->ecc.size = 256;
		} else if (plat->page_size == NFC_PG_SIZE_512) {
			chip->ecc.bytes = 6;
			chip->ecc.size = 512;
		}

		chip->read_buf      = bf5xx_nand_dma_read_buf;
		chip->write_buf     = bf5xx_nand_dma_write_buf;
		chip->ecc.calculate = bf5xx_nand_calculate_ecc;
		chip->ecc.correct   = bf5xx_nand_correct_data;
		chip->ecc.mode	    = NAND_ECC_HW;
		chip->ecc.hwctl	    = bf5xx_nand_enable_hwecc;
	} else {
		chip->ecc.mode	    = NAND_ECC_SOFT;
	}

	/* scan hardware nand chip and setup mtd info data struct */
	if (nand_scan(mtd, 1)) {
		err = -ENXIO;
		goto out_err_nand_scan;
	}

	/* add NAND partition */
	bf5xx_nand_add_partition(info);

	dev_dbg(&pdev->dev, "initialised ok\n");
	return 0;

out_err_nand_scan:
	bf5xx_nand_dma_remove(info);
out_err_hw_init:
	platform_set_drvdata(pdev, NULL);
	kfree(info);
out_err_kzalloc:
	peripheral_free_list(bfin_nfc_pin_req);

	return err;
}

/* PM Support */
#ifdef CONFIG_PM

static int bf5xx_nand_suspend(struct platform_device *dev, pm_message_t pm)
{
	struct bf5xx_nand_info *info = platform_get_drvdata(dev);

	return 0;
}

static int bf5xx_nand_resume(struct platform_device *dev)
{
	struct bf5xx_nand_info *info = platform_get_drvdata(dev);

	return 0;
}

#else
#define bf5xx_nand_suspend NULL
#define bf5xx_nand_resume NULL
#endif

/* driver device registration */
static struct platform_driver bf5xx_nand_driver = {
	.probe		= bf5xx_nand_probe,
	.remove		= __devexit_p(bf5xx_nand_remove),
	.suspend	= bf5xx_nand_suspend,
	.resume		= bf5xx_nand_resume,
	.driver		= {
		.name	= DRV_NAME,
		.owner	= THIS_MODULE,
	},
};

static int __init bf5xx_nand_init(void)
{
	printk(KERN_INFO "%s, Version %s (c) 2007 Analog Devices, Inc.\n",
		DRV_DESC, DRV_VERSION);

	return platform_driver_register(&bf5xx_nand_driver);
}

static void __exit bf5xx_nand_exit(void)
{
	platform_driver_unregister(&bf5xx_nand_driver);
}

module_init(bf5xx_nand_init);
module_exit(bf5xx_nand_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR(DRV_AUTHOR);
MODULE_DESCRIPTION(DRV_DESC);
MODULE_ALIAS("platform:" DRV_NAME);