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 yaffs_packed_tags2 pt;
45 int packed_tags_size = dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
46 void * packed_tags_ptr = dev->param.no_tags_ecc ? (void *) &pt.t : (void *)&pt;
50 ("nandmtd2_write_chunk_tags chunk %d data %p tags %p"
51 TENDSTR), nand_chunk, data, tags));
54 addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
56 /* For yaffs2 writing there must be both data and tags.
57 * If we're using inband tags, then the tags are stuffed into
58 * the end of the data buffer.
62 else if (dev->param.inband_tags) {
63 yaffs_packed_tags2_tags_only *pt2tp;
64 pt2tp = (yaffs_packed_tags2_tags_only *)(data + dev->data_bytes_per_chunk);
65 yaffs_pack_tags2_tags_only(pt2tp, tags);
67 yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
69 ops.mode = MTD_OOB_AUTO;
70 ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size;
71 ops.len = dev->param.total_bytes_per_chunk;
73 ops.datbuf = (u8 *)data;
74 ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
75 retval = mtd->write_oob(mtd, addr, &ops);
84 int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
85 u8 *data, struct yaffs_ext_tags *tags)
87 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
88 struct mtd_oob_ops ops;
94 loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
96 yaffs_packed_tags2 pt;
98 int packed_tags_size = dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
99 void * packed_tags_ptr = dev->param.no_tags_ecc ? (void *) &pt.t: (void *)&pt;
103 ("nandmtd2_read_chunk_tags chunk %d data %p tags %p"
104 TENDSTR), nand_chunk, data, tags));
106 if (dev->param.inband_tags) {
110 data = yaffs_get_temp_buffer(dev, __LINE__);
117 if (dev->param.inband_tags || (data && !tags))
118 retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk,
121 ops.mode = MTD_OOB_AUTO;
122 ops.ooblen = packed_tags_size;
123 ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
126 ops.oobbuf = yaffs_dev_to_lc(dev)->spare_buffer;
127 retval = mtd->read_oob(mtd, addr, &ops);
130 if (dev->param.inband_tags) {
132 yaffs_packed_tags2_tags_only *pt2tp;
133 pt2tp = (yaffs_packed_tags2_tags_only *)&data[dev->data_bytes_per_chunk];
134 yaffs_unpack_tags2_tags_only(tags, pt2tp);
138 memcpy(packed_tags_ptr, yaffs_dev_to_lc(dev)->spare_buffer, packed_tags_size);
139 yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
144 yaffs_release_temp_buffer(dev, data, __LINE__);
146 if (tags && retval == -EBADMSG && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
147 tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
148 dev->n_ecc_unfixed++;
150 if(tags && retval == -EUCLEAN && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
151 tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
160 int nandmtd2_mark_block_bad(struct yaffs_dev *dev, int block_no)
162 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
165 (TSTR("nandmtd2_mark_block_bad %d" TENDSTR), block_no));
168 mtd->block_markbad(mtd,
169 block_no * dev->param.chunks_per_block *
170 dev->param.total_bytes_per_chunk);
179 int nandmtd2_query_block(struct yaffs_dev *dev, int block_no,
180 enum yaffs_block_state *state, u32 *seq_number)
182 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
186 (TSTR("nandmtd2_query_block %d" TENDSTR), block_no));
188 mtd->block_isbad(mtd,
189 block_no * dev->param.chunks_per_block *
190 dev->param.total_bytes_per_chunk);
193 T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
195 *state = YAFFS_BLOCK_STATE_DEAD;
198 struct yaffs_ext_tags t;
199 nandmtd2_read_chunk_tags(dev, block_no *
200 dev->param.chunks_per_block, NULL,
204 *seq_number = t.seq_number;
205 *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
208 *state = YAFFS_BLOCK_STATE_EMPTY;
212 (TSTR("block is bad seq %d state %d" TENDSTR), *seq_number,