Root/target/linux/generic/files/fs/yaffs2/yaffs_mtdif2.c

1/*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14/* mtd interface for YAFFS2 */
15
16#include "yportenv.h"
17#include "yaffs_trace.h"
18
19#include "yaffs_mtdif2.h"
20
21#include "linux/mtd/mtd.h"
22#include "linux/types.h"
23#include "linux/time.h"
24
25#include "yaffs_packedtags2.h"
26
27#include "yaffs_linux.h"
28
29/* NB For use with inband tags....
30 * We assume that the data buffer is of size totalBytersPerChunk so that we can also
31 * use it to load the tags.
32 */
33int nandmtd2_WriteChunkWithTagsToNAND(yaffs_dev_t *dev, int nand_chunk,
34                      const __u8 *data,
35                      const yaffs_ext_tags *tags)
36{
37    struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
38#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
39    struct mtd_oob_ops ops;
40#else
41    size_t dummy;
42#endif
43    int retval = 0;
44
45    loff_t addr;
46
47    yaffs_PackedTags2 pt;
48
49    int packed_tags_size = dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
50    void * packed_tags_ptr = dev->param.no_tags_ecc ? (void *) &pt.t : (void *)&pt;
51
52    T(YAFFS_TRACE_MTD,
53      (TSTR
54       ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
55        TENDSTR), nand_chunk, data, tags));
56
57
58    addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
59
60    /* For yaffs2 writing there must be both data and tags.
61     * If we're using inband tags, then the tags are stuffed into
62     * the end of the data buffer.
63     */
64    if (!data || !tags)
65        BUG();
66    else if (dev->param.inband_tags) {
67        yaffs_PackedTags2TagsPart *pt2tp;
68        pt2tp = (yaffs_PackedTags2TagsPart *)(data + dev->data_bytes_per_chunk);
69        yaffs_PackTags2TagsPart(pt2tp, tags);
70    } else
71        yaffs_PackTags2(&pt, tags, !dev->param.no_tags_ecc);
72
73#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
74    ops.mode = MTD_OOB_AUTO;
75    ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size;
76    ops.len = dev->param.total_bytes_per_chunk;
77    ops.ooboffs = 0;
78    ops.datbuf = (__u8 *)data;
79    ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
80    retval = mtd->write_oob(mtd, addr, &ops);
81
82#else
83    if (!dev->param.inband_tags) {
84        retval =
85            mtd->write_ecc(mtd, addr, dev->data_bytes_per_chunk,
86                   &dummy, data, (__u8 *) packed_tags_ptr, NULL);
87    } else {
88        retval =
89            mtd->write(mtd, addr, dev->param.total_bytes_per_chunk, &dummy,
90                   data);
91    }
92#endif
93
94    if (retval == 0)
95        return YAFFS_OK;
96    else
97        return YAFFS_FAIL;
98}
99
100int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_dev_t *dev, int nand_chunk,
101                       __u8 *data, yaffs_ext_tags *tags)
102{
103    struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
104#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
105    struct mtd_oob_ops ops;
106#endif
107    size_t dummy;
108    int retval = 0;
109    int localData = 0;
110
111    loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
112
113    yaffs_PackedTags2 pt;
114
115    int packed_tags_size = dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
116    void * packed_tags_ptr = dev->param.no_tags_ecc ? (void *) &pt.t: (void *)&pt;
117
118    T(YAFFS_TRACE_MTD,
119      (TSTR
120       ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
121        TENDSTR), nand_chunk, data, tags));
122
123    if (dev->param.inband_tags) {
124
125        if (!data) {
126            localData = 1;
127            data = yaffs_get_temp_buffer(dev, __LINE__);
128        }
129
130
131    }
132
133
134#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
135    if (dev->param.inband_tags || (data && !tags))
136        retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk,
137                &dummy, data);
138    else if (tags) {
139        ops.mode = MTD_OOB_AUTO;
140        ops.ooblen = packed_tags_size;
141        ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
142        ops.ooboffs = 0;
143        ops.datbuf = data;
144        ops.oobbuf = yaffs_dev_to_lc(dev)->spareBuffer;
145        retval = mtd->read_oob(mtd, addr, &ops);
146    }
147#else
148    if (!dev->param.inband_tags && data && tags) {
149
150        retval = mtd->read_ecc(mtd, addr, dev->data_bytes_per_chunk,
151                      &dummy, data, dev->spareBuffer,
152                      NULL);
153    } else {
154        if (data)
155            retval =
156                mtd->read(mtd, addr, dev->data_bytes_per_chunk, &dummy,
157                      data);
158        if (!dev->param.inband_tags && tags)
159            retval =
160                mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
161                      dev->spareBuffer);
162    }
163#endif
164
165
166    if (dev->param.inband_tags) {
167        if (tags) {
168            yaffs_PackedTags2TagsPart *pt2tp;
169            pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->data_bytes_per_chunk];
170            yaffs_unpack_tags2tags_part(tags, pt2tp);
171        }
172    } else {
173        if (tags) {
174            memcpy(packed_tags_ptr, yaffs_dev_to_lc(dev)->spareBuffer, packed_tags_size);
175            yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
176        }
177    }
178
179    if (localData)
180        yaffs_release_temp_buffer(dev, data, __LINE__);
181
182    if (tags && retval == -EBADMSG && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
183        tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
184        dev->n_ecc_unfixed++;
185    }
186    if(tags && retval == -EUCLEAN && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
187        tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
188        dev->n_ecc_fixed++;
189    }
190    if (retval == 0)
191        return YAFFS_OK;
192    else
193        return YAFFS_FAIL;
194}
195
196int nandmtd2_MarkNANDBlockBad(struct yaffs_dev_s *dev, int block_no)
197{
198    struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
199    int retval;
200    T(YAFFS_TRACE_MTD,
201      (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), block_no));
202
203    retval =
204        mtd->block_markbad(mtd,
205                   block_no * dev->param.chunks_per_block *
206                   dev->param.total_bytes_per_chunk);
207
208    if (retval == 0)
209        return YAFFS_OK;
210    else
211        return YAFFS_FAIL;
212
213}
214
215int nandmtd2_QueryNANDBlock(struct yaffs_dev_s *dev, int block_no,
216                yaffs_block_state_t *state, __u32 *seq_number)
217{
218    struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
219    int retval;
220
221    T(YAFFS_TRACE_MTD,
222      (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), block_no));
223    retval =
224        mtd->block_isbad(mtd,
225                 block_no * dev->param.chunks_per_block *
226                 dev->param.total_bytes_per_chunk);
227
228    if (retval) {
229        T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
230
231        *state = YAFFS_BLOCK_STATE_DEAD;
232        *seq_number = 0;
233    } else {
234        yaffs_ext_tags t;
235        nandmtd2_ReadChunkWithTagsFromNAND(dev,
236                           block_no *
237                           dev->param.chunks_per_block, NULL,
238                           &t);
239
240        if (t.chunk_used) {
241            *seq_number = t.seq_number;
242            *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
243        } else {
244            *seq_number = 0;
245            *state = YAFFS_BLOCK_STATE_EMPTY;
246        }
247    }
248    T(YAFFS_TRACE_MTD,
249      (TSTR("block is bad seq %d state %d" TENDSTR), *seq_number,
250       *state));
251
252    if (retval == 0)
253        return YAFFS_OK;
254    else
255        return YAFFS_FAIL;
256}
257
258

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