2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 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"
24 #include "mtd/mtd-abi.h"
27 /* NB For use with inband tags....
28 * We assume that the data buffer is of size total_bytes_per_chunk so that
29 * we can also use it to load the tags.
31 int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
33 const struct yaffs_ext_tags *tags)
35 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
36 struct mtd_oob_ops ops;
39 struct yaffs_packed_tags2 pt;
40 int packed_tags_size =
41 dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
42 void *packed_tags_ptr =
43 dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
45 yaffs_trace(YAFFS_TRACE_MTD,
46 "nandmtd2_write_chunk_tags chunk %d data %p tags %p",
47 nand_chunk, data, tags);
49 addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
51 /* For yaffs2 writing there must be both data and tags.
52 * If we're using inband tags, then the tags are stuffed into
53 * the end of the data buffer.
57 else if (dev->param.inband_tags) {
58 struct yaffs_packed_tags2_tags_only *pt2tp;
61 (struct yaffs_packed_tags2_tags_only *)
62 (data + dev->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_OPS_AUTO_OOB;
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 && !data) {
103 data = yaffs_get_temp_buffer(dev);
106 if (dev->param.inband_tags || (data && !tags)) {
107 retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk,
110 ops.mode = MTD_OPS_AUTO_OOB;
111 ops.ooblen = packed_tags_size;
112 ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
115 ops.oobbuf = yaffs_dev_to_lc(dev)->spare_buffer;
116 retval = mtd->read_oob(mtd, addr, &ops);
119 if (dev->param.inband_tags && tags) {
120 struct yaffs_packed_tags2_tags_only *pt2tp;
123 (struct yaffs_packed_tags2_tags_only *)
124 &data[dev->data_bytes_per_chunk];
125 yaffs_unpack_tags2_tags_only(tags, pt2tp);
127 memcpy(packed_tags_ptr,
128 yaffs_dev_to_lc(dev)->spare_buffer,
130 yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
134 yaffs_release_temp_buffer(dev, data);
136 if (tags && retval == -EBADMSG &&
137 tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
138 tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
139 dev->n_ecc_unfixed++;
141 if (tags && retval == -EUCLEAN &&
142 tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
143 tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
153 int nandmtd2_mark_block_bad(struct yaffs_dev *dev, int block_no)
155 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
158 yaffs_trace(YAFFS_TRACE_MTD,
159 "nandmtd2_mark_block_bad %d", block_no);
162 mtd->block_markbad(mtd,
163 block_no * dev->param.chunks_per_block *
164 dev->param.total_bytes_per_chunk);
172 int nandmtd2_query_block(struct yaffs_dev *dev, int block_no,
173 enum yaffs_block_state *state, u32 * seq_number)
175 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
178 yaffs_trace(YAFFS_TRACE_MTD, "nandmtd2_query_block %d", block_no);
180 mtd->block_isbad(mtd,
181 block_no * dev->param.chunks_per_block *
182 dev->param.total_bytes_per_chunk);
185 yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
187 *state = YAFFS_BLOCK_STATE_DEAD;
190 struct yaffs_ext_tags t;
192 nandmtd2_read_chunk_tags(dev, block_no *
193 dev->param.chunks_per_block, NULL, &t);
196 *seq_number = t.seq_number;
197 *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
200 *state = YAFFS_BLOCK_STATE_EMPTY;
203 yaffs_trace(YAFFS_TRACE_MTD,
204 "block is bad seq %d state %d", *seq_number, *state);