aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/generic-2.6/files/fs/yaffs2/yaffs_mtdif.c
blob: 466e5a44c6d548ef64f3a144941e112caab1e803 (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
/*
 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
 *
 * Copyright (C) 2002-2007 Aleph One Ltd.
 *   for Toby Churchill Ltd and Brightstar Engineering
 *
 * Created by Charles Manning <charles@aleph1.co.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

const char *yaffs_mtdif_c_version =
    "$Id: yaffs_mtdif.c,v 1.19 2007-02-14 01:09:06 wookey Exp $";

#include "yportenv.h"


#include "yaffs_mtdif.h"

#include "linux/mtd/mtd.h"
#include "linux/types.h"
#include "linux/time.h"
#include "linux/mtd/nand.h"

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
static struct nand_oobinfo yaffs_oobinfo = {
	.useecc = 1,
	.eccbytes = 6,
	.eccpos = {8, 9, 10, 13, 14, 15}
};

static struct nand_oobinfo yaffs_noeccinfo = {
	.useecc = 0,
};
#endif

#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
{
	oob[0] = spare->tagByte0;
	oob[1] = spare->tagByte1;
	oob[2] = spare->tagByte2;
	oob[3] = spare->tagByte3;
	oob[4] = spare->tagByte4;
	oob[5] = spare->tagByte5 & 0x3f;
	oob[5] |= spare->blockStatus == 'Y' ? 0: 0x80;
	oob[5] |= spare->pageStatus == 0 ? 0: 0x40;
	oob[6] = spare->tagByte6;
	oob[7] = spare->tagByte7;
}

static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
{
	struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
	spare->tagByte0 = oob[0];
	spare->tagByte1 = oob[1];
	spare->tagByte2 = oob[2];
	spare->tagByte3 = oob[3];
	spare->tagByte4 = oob[4];
	spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
	spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
	spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
	spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
	spare->tagByte6 = oob[6];
	spare->tagByte7 = oob[7];
	spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;

	nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
}
#endif

int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
			     const __u8 * data, const yaffs_Spare * spare)
{
	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
	struct mtd_oob_ops ops;
#endif
	size_t dummy;
	int retval = 0;

	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
	__u8 spareAsBytes[8]; /* OOB */

	if (data && !spare)
		retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
				&dummy, data);
	else if (spare) {
		if (dev->useNANDECC) {
			translate_spare2oob(spare, spareAsBytes);
			ops.mode = MTD_OOB_AUTO;
			ops.ooblen = 8; /* temp hack */
		} else {
			ops.mode = MTD_OOB_RAW;
			ops.ooblen = YAFFS_BYTES_PER_SPARE;
		}
		ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
		ops.datbuf = (u8 *)data;
		ops.ooboffs = 0;
		ops.oobbuf = spareAsBytes;
		retval = mtd->write_oob(mtd, addr, &ops);
	}
#else
	__u8 *spareAsBytes = (__u8 *) spare;

	if (data && spare) {
		if (dev->useNANDECC)
			retval =
			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
					   &dummy, data, spareAsBytes,
					   &yaffs_oobinfo);
		else
			retval =
			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
					   &dummy, data, spareAsBytes,
					   &yaffs_noeccinfo);
	} else {
		if (data)
			retval =
			    mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
				       data);
		if (spare)
			retval =
			    mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
					   &dummy, spareAsBytes);
	}
#endif

	if (retval == 0)
		return YAFFS_OK;
	else
		return YAFFS_FAIL;
}

int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
			      yaffs_Spare * spare)
{
	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
	struct mtd_oob_ops ops;
#endif
	size_t dummy;
	int retval = 0;

	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
	__u8 spareAsBytes[8]; /* OOB */

	if (data && !spare)
		retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
				&dummy, data);
	else if (spare) {
		if (dev->useNANDECC) {
			ops.mode = MTD_OOB_AUTO;
			ops.ooblen = 8; /* temp hack */
		} else {
			ops.mode = MTD_OOB_RAW;
			ops.ooblen = YAFFS_BYTES_PER_SPARE;
		}
		ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
		ops.datbuf = data;
		ops.ooboffs = 0;
		ops.oobbuf = spareAsBytes;
		retval = mtd->read_oob(mtd, addr, &ops);
		if (dev->useNANDECC)
			translate_oob2spare(spare, spareAsBytes);
	}
#else
	__u8 *spareAsBytes = (__u8 *) spare;

	if (data && spare) {
		if (dev->useNANDECC) {
			/* Careful, this call adds 2 ints */
			/* to the end of the spare data.  Calling function */
			/* should allocate enough memory for spare, */
			/* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
			retval =
			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
					  &dummy, data, spareAsBytes,
					  &yaffs_oobinfo);
		} else {
			retval =
			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
					  &dummy, data, spareAsBytes,
					  &yaffs_noeccinfo);
		}
	} else {
		if (data)
			retval =
			    mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
				      data);
		if (spare)
			retval =
			    mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
					  &dummy, spareAsBytes);
	}
#endif

	if (retval == 0)
		return YAFFS_OK;
	else
		return YAFFS_FAIL;
}

int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
{
	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
	__u32 addr =
	    ((loff_t) blockNumber) * dev->nDataBytesPerChunk
		* dev->nChunksPerBlock;
	struct erase_info ei;
	int retval = 0;

	ei.mtd = mtd;
	ei.addr = addr;
	ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
	ei.time = 1000;
	ei.retries = 2;
	ei.callback = NULL;
	ei.priv = (u_long) dev;

	/* Todo finish off the ei if required */

	sema_init(&dev->sem, 0);

	retval = mtd->erase(mtd, &ei);

	if (retval == 0)
		return YAFFS_OK;
	else
		return YAFFS_FAIL;
}

int nandmtd_InitialiseNAND(yaffs_Device * dev)
{
	return YAFFS_OK;
}