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"
18 #include "yaffs_mtdif2.h"
19 #include "yaffs_packedtags2.h"
20 #include "yaffs_linux.h"
21 #include "linux/mtd/mtd.h"
22 #include "linux/types.h"
23 #include "linux/time.h"
26 /* NB For use with inband tags....
27 * We assume that the data buffer is of size total_bytes_per_chunk so that
28 * we can also use it to load the tags.
30 int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
32 const struct yaffs_ext_tags *tags)
34 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
35 struct mtd_oob_ops ops;
38 struct yaffs_packed_tags2 pt;
39 int packed_tags_size =
40 dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
41 void *packed_tags_ptr =
42 dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
44 yaffs_trace(YAFFS_TRACE_MTD,
45 "nandmtd2_write_chunk_tags chunk %d data %p tags %p",
46 nand_chunk, data, tags);
48 addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
50 /* For yaffs2 writing there must be both data and tags.
51 * If we're using inband tags, then the tags are stuffed into
52 * the end of the data buffer.
56 else if (dev->param.inband_tags) {
57 struct yaffs_packed_tags2_tags_only *pt2tp;
60 (struct yaffs_packed_tags2_tags_only *)(data +
62 data_bytes_per_chunk);
63 yaffs_pack_tags2_tags_only(pt2tp, tags);
65 yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
68 ops.mode = MTD_OOB_AUTO;
69 ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size;
70 ops.len = dev->param.total_bytes_per_chunk;
72 ops.datbuf = (u8 *) data;
73 ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
74 retval = mtd->write_oob(mtd, addr, &ops);
82 int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
83 u8 *data, struct yaffs_ext_tags *tags)
85 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
86 struct mtd_oob_ops ops;
90 loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
91 struct yaffs_packed_tags2 pt;
92 int packed_tags_size =
93 dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
94 void *packed_tags_ptr =
95 dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
97 yaffs_trace(YAFFS_TRACE_MTD,
98 "nandmtd2_read_chunk_tags chunk %d data %p tags %p",
99 nand_chunk, data, tags);
101 if (dev->param.inband_tags) {
105 data = yaffs_get_temp_buffer(dev, __LINE__);
109 if (dev->param.inband_tags || (data && !tags))
110 retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk,
113 ops.mode = MTD_OOB_AUTO;
114 ops.ooblen = packed_tags_size;
115 ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
118 ops.oobbuf = yaffs_dev_to_lc(dev)->spare_buffer;
119 retval = mtd->read_oob(mtd, addr, &ops);
122 if (dev->param.inband_tags) {
124 struct yaffs_packed_tags2_tags_only *pt2tp;
126 (struct yaffs_packed_tags2_tags_only *)
127 &data[dev->data_bytes_per_chunk];
128 yaffs_unpack_tags2_tags_only(tags, pt2tp);
132 memcpy(packed_tags_ptr,
133 yaffs_dev_to_lc(dev)->spare_buffer,
135 yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
140 yaffs_release_temp_buffer(dev, data, __LINE__);
142 if (tags && retval == -EBADMSG
143 && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
144 tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
145 dev->n_ecc_unfixed++;
147 if (tags && retval == -EUCLEAN
148 && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
149 tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
158 int nandmtd2_mark_block_bad(struct yaffs_dev *dev, int block_no)
160 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
163 yaffs_trace(YAFFS_TRACE_MTD,
164 "nandmtd2_mark_block_bad %d", block_no);
167 mtd->block_markbad(mtd,
168 block_no * dev->param.chunks_per_block *
169 dev->param.total_bytes_per_chunk);
177 int nandmtd2_query_block(struct yaffs_dev *dev, int block_no,
178 enum yaffs_block_state *state, u32 * seq_number)
180 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
183 yaffs_trace(YAFFS_TRACE_MTD, "nandmtd2_query_block %d", block_no);
185 mtd->block_isbad(mtd,
186 block_no * dev->param.chunks_per_block *
187 dev->param.total_bytes_per_chunk);
190 yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
192 *state = YAFFS_BLOCK_STATE_DEAD;
195 struct yaffs_ext_tags t;
196 nandmtd2_read_chunk_tags(dev, block_no *
197 dev->param.chunks_per_block, NULL, &t);
200 *seq_number = t.seq_number;
201 *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
204 *state = YAFFS_BLOCK_STATE_EMPTY;
207 yaffs_trace(YAFFS_TRACE_MTD,
208 "block is bad seq %d state %d", *seq_number, *state);