2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2007 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 */
18 #include "asm/errno.h"
21 #include "yaffs_trace.h"
23 #include "yaffs_mtdif2.h"
25 #include "linux/mtd/mtd.h"
26 #include "linux/types.h"
27 #include "linux/time.h"
29 #include "yaffs_trace.h"
30 #include "yaffs_packedtags2.h"
33 #define yaffs_dev_to_mtd(dev) ((struct mtd_info *)((dev)->driver_context))
34 #define yaffs_dev_to_lc(dev) ((struct yaffs_linux_context *)((dev)->os_context))
37 /* NB For use with inband tags....
38 * We assume that the data buffer is of size total_bytes_per_chunk so
39 * that we can also use it to load the tags.
41 int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
43 const struct yaffs_ext_tags *tags)
45 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
46 struct mtd_oob_ops ops;
53 struct yaffs_packed_tags2 pt;
55 int packed_tags_size =
56 dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
57 void *packed_tags_ptr =
58 dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
60 yaffs_trace(YAFFS_TRACE_MTD,
61 "nandmtd2_write_chunk_tags chunk %d data %p tags %p",
62 nand_chunk, data, tags);
64 addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
66 /* For yaffs2 writing there must be both data and tags.
67 * If we're using inband tags, then the tags are stuffed into
68 * the end of the data buffer.
72 else if (dev->param.inband_tags) {
73 struct yaffs_packed_tags2_tags_only *pt2tp;
75 (struct yaffs_packed_tags2_tags_only *)(data +
77 data_bytes_per_chunk);
78 yaffs_pack_tags2_tags_only(pt2tp, tags);
80 yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
83 ops.mode = MTD_OOB_AUTO;
84 ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size;
85 ops.len = dev->param.total_bytes_per_chunk;
87 ops.datbuf = (u8 *) data;
88 ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
89 retval = mtd->write_oob(mtd, addr, &ops);
97 int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
98 u8 *data, struct yaffs_ext_tags *tags)
100 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
102 struct mtd_oob_ops ops;
106 struct yaffs_packed_tags2 pt;
107 loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
108 int packed_tags_size =
109 dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
110 void *packed_tags_ptr =
111 dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
113 yaffs_trace(YAFFS_TRACE_MTD,
114 "nandmtd2_read_chunk_tags chunk %d data %p tags %p",
115 nand_chunk, data, tags);
117 if (dev->param.inband_tags) {
121 data = yaffs_get_temp_buffer(dev);
126 if (dev->param.inband_tags || (data && !tags))
127 retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk,
130 ops.mode = MTD_OOB_AUTO;
131 ops.ooblen = packed_tags_size;
132 ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
135 ops.oobbuf = local_spare;
136 retval = mtd->read_oob(mtd, addr, &ops);
139 if (dev->param.inband_tags) {
141 struct yaffs_packed_tags2_tags_only *pt2tp;
143 (struct yaffs_packed_tags2_tags_only *)
144 &data[dev->data_bytes_per_chunk];
145 yaffs_unpack_tags2_tags_only(tags, pt2tp);
149 memcpy(packed_tags_ptr,
152 yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
157 yaffs_release_temp_buffer(dev, data);
159 if (tags && retval == -EBADMSG
160 && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
161 tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
162 dev->n_ecc_unfixed++;
164 if (tags && retval == -EUCLEAN
165 && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
166 tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
176 int nandmtd2_MarkNANDBlockBad(struct yaffs_dev *dev, int blockNo)
178 struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
181 yaffs_trace(YAFFS_TRACE_MTD,
182 "nandmtd2_MarkNANDBlockBad %d", blockNo);
185 mtd->block_markbad(mtd,
186 blockNo * dev->param.chunks_per_block *
187 dev->data_bytes_per_chunk);
196 int nandmtd2_QueryNANDBlock(struct yaffs_dev *dev, int blockNo,
197 enum yaffs_block_state *state, u32 *sequenceNumber)
199 struct mtd_info *mtd = (struct mtd_info *)(dev->driver_context);
202 yaffs_trace(YAFFS_TRACE_MTD, "nandmtd2_QueryNANDBlock %d", blockNo);
204 mtd->block_isbad(mtd,
205 blockNo * dev->param.chunks_per_block *
206 dev->data_bytes_per_chunk);
209 yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
211 *state = YAFFS_BLOCK_STATE_DEAD;
214 struct yaffs_ext_tags t;
215 nandmtd2_read_chunk_tags(dev,
217 dev->param.chunks_per_block, NULL,
221 *sequenceNumber = t.seq_number;
222 *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
225 *state = YAFFS_BLOCK_STATE_EMPTY;
228 yaffs_trace(YAFFS_TRACE_MTD, "block is bad seq %d state %d",
229 *sequenceNumber, *state);