2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
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.
14 /* mtd interface for YAFFS2 */
17 #include "yaffs_trace.h"
19 #include "yaffs_mtdif2.h"
21 #include "linux/mtd/mtd.h"
22 #include "linux/types.h"
23 #include "linux/time.h"
25 #include "yaffs_packedtags2.h"
27 #include "yaffs_linux.h"
29 /* NB For use with inband tags....
30 * We assume that the data buffer is of size total_bytes_per_chunk so that we can also
31 * use it to load the tags.
33 int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
35 const struct yaffs_ext_tags *tags)
37 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
38 struct mtd_oob_ops ops;
43 struct yaffs_packed_tags2 pt;
45 int packed_tags_size =
46 dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
47 void *packed_tags_ptr =
48 dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
52 ("nandmtd2_write_chunk_tags chunk %d data %p tags %p"
53 TENDSTR), nand_chunk, data, tags));
55 addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
57 /* For yaffs2 writing there must be both data and tags.
58 * If we're using inband tags, then the tags are stuffed into
59 * the end of the data buffer.
63 else if (dev->param.inband_tags) {
64 struct yaffs_packed_tags2_tags_only *pt2tp;
66 (struct yaffs_packed_tags2_tags_only *)(data +
68 data_bytes_per_chunk);
69 yaffs_pack_tags2_tags_only(pt2tp, tags);
71 yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
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;
78 ops.datbuf = (u8 *) data;
79 ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
80 retval = mtd->write_oob(mtd, addr, &ops);
88 int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
89 u8 * data, struct yaffs_ext_tags *tags)
91 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
92 struct mtd_oob_ops ops;
98 loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
100 struct yaffs_packed_tags2 pt;
102 int packed_tags_size =
103 dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
104 void *packed_tags_ptr =
105 dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
109 ("nandmtd2_read_chunk_tags chunk %d data %p tags %p"
110 TENDSTR), nand_chunk, data, tags));
112 if (dev->param.inband_tags) {
116 data = yaffs_get_temp_buffer(dev, __LINE__);
121 if (dev->param.inband_tags || (data && !tags))
122 retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk,
125 ops.mode = MTD_OOB_AUTO;
126 ops.ooblen = packed_tags_size;
127 ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
130 ops.oobbuf = yaffs_dev_to_lc(dev)->spare_buffer;
131 retval = mtd->read_oob(mtd, addr, &ops);
134 if (dev->param.inband_tags) {
136 struct yaffs_packed_tags2_tags_only *pt2tp;
138 (struct yaffs_packed_tags2_tags_only *)&data[dev->
139 data_bytes_per_chunk];
140 yaffs_unpack_tags2_tags_only(tags, pt2tp);
144 memcpy(packed_tags_ptr,
145 yaffs_dev_to_lc(dev)->spare_buffer,
147 yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
152 yaffs_release_temp_buffer(dev, data, __LINE__);
154 if (tags && retval == -EBADMSG
155 && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
156 tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
157 dev->n_ecc_unfixed++;
159 if (tags && retval == -EUCLEAN
160 && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
161 tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
170 int nandmtd2_mark_block_bad(struct yaffs_dev *dev, int block_no)
172 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
175 (TSTR("nandmtd2_mark_block_bad %d" TENDSTR), block_no));
178 mtd->block_markbad(mtd,
179 block_no * dev->param.chunks_per_block *
180 dev->param.total_bytes_per_chunk);
189 int nandmtd2_query_block(struct yaffs_dev *dev, int block_no,
190 enum yaffs_block_state *state, u32 * seq_number)
192 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
195 T(YAFFS_TRACE_MTD, (TSTR("nandmtd2_query_block %d" TENDSTR), block_no));
197 mtd->block_isbad(mtd,
198 block_no * dev->param.chunks_per_block *
199 dev->param.total_bytes_per_chunk);
202 T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
204 *state = YAFFS_BLOCK_STATE_DEAD;
207 struct yaffs_ext_tags t;
208 nandmtd2_read_chunk_tags(dev, block_no *
209 dev->param.chunks_per_block, NULL, &t);
212 *seq_number = t.seq_number;
213 *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
216 *state = YAFFS_BLOCK_STATE_EMPTY;
220 (TSTR("block is bad seq %d state %d" TENDSTR), *seq_number, *state));