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[u-boot] / fs / yaffs2 / yaffs_nandif.c
1 /*
2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3  *
4  * Copyright (C) 2002-2011 Aleph One Ltd.
5  *   for Toby Churchill Ltd and Brightstar Engineering
6  *
7  * Created by Charles Manning <charles@aleph1.co.uk>
8  *
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.
12  */
13
14 #include "yportenv.h"
15 #include "yaffs_guts.h"
16
17
18 #include "yaffs_nandif.h"
19 #include "yaffs_packedtags2.h"
20
21 #include "yramsim.h"
22
23 #include "yaffs_trace.h"
24 #include "yaffsfs.h"
25
26
27 /* NB For use with inband tags....
28  * We assume that the data buffer is of size totalBytersPerChunk so that
29  * we can also use it to load the tags.
30  */
31 int ynandif_WriteChunkWithTagsToNAND(struct yaffs_dev *dev, int nand_chunk,
32                                       const u8 *data,
33                                       const struct yaffs_ext_tags *tags)
34 {
35
36         int retval = 0;
37         struct yaffs_packed_tags2 pt;
38         void *spare;
39         unsigned spareSize = 0;
40         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
41
42         yaffs_trace(YAFFS_TRACE_MTD,
43                 "nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p",
44                 nand_chunk, data, tags);
45
46
47         /* For yaffs2 writing there must be both data and tags.
48          * If we're using inband tags, then the tags are stuffed into
49          * the end of the data buffer.
50          */
51
52         if (dev->param.inband_tags) {
53                 struct yaffs_packed_tags2_tags_only *pt2tp;
54
55                 pt2tp = (struct yaffs_packed_tags2_tags_only *)
56                         (data + dev->data_bytes_per_chunk);
57                 yaffs_pack_tags2_tags_only(pt2tp, tags);
58                 spare = NULL;
59                 spareSize = 0;
60         } else {
61                 yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
62                 spare = &pt;
63                 spareSize = sizeof(struct yaffs_packed_tags2);
64         }
65
66         retval = geometry->writeChunk(dev, nand_chunk,
67                                 data, dev->param.total_bytes_per_chunk,
68                                 spare, spareSize);
69
70         return retval;
71 }
72
73 int ynandif_ReadChunkWithTagsFromNAND(struct yaffs_dev *dev, int nand_chunk,
74                                        u8 *data, struct yaffs_ext_tags *tags)
75 {
76         struct yaffs_packed_tags2 pt;
77         int localData = 0;
78         void *spare = NULL;
79         unsigned spareSize;
80         int retval = 0;
81         int eccStatus; /* 0 = ok, 1 = fixed, -1 = unfixed */
82         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
83
84         yaffs_trace(YAFFS_TRACE_MTD,
85                 "nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p",
86                 nand_chunk, data, tags);
87
88         if (!tags) {
89                 spare = NULL;
90                 spareSize = 0;
91         } else if (dev->param.inband_tags) {
92
93                 if (!data) {
94                         localData = 1;
95                         data = yaffs_get_temp_buffer(dev);
96                 }
97                 spare = NULL;
98                 spareSize = 0;
99         } else {
100                 spare = &pt;
101                 spareSize = sizeof(struct yaffs_packed_tags2);
102         }
103
104         retval = geometry->readChunk(dev, nand_chunk,
105                                  data,
106                                  data ? dev->param.total_bytes_per_chunk : 0,
107                                  spare, spareSize,
108                                  &eccStatus);
109
110         if (dev->param.inband_tags) {
111                 if (tags) {
112                         struct yaffs_packed_tags2_tags_only *pt2tp;
113                         pt2tp = (struct yaffs_packed_tags2_tags_only *)
114                                         &data[dev->data_bytes_per_chunk];
115                         yaffs_unpack_tags2_tags_only(tags, pt2tp);
116                 }
117         } else {
118                 if (tags)
119                         yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
120         }
121
122         if (tags && tags->chunk_used) {
123                 if (eccStatus < 0 ||
124                    tags->ecc_result == YAFFS_ECC_RESULT_UNFIXED)
125                         tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
126                 else if (eccStatus > 0 ||
127                              tags->ecc_result == YAFFS_ECC_RESULT_FIXED)
128                         tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
129                 else
130                         tags->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
131         }
132
133         if (localData)
134                 yaffs_release_temp_buffer(dev, data);
135
136         return retval;
137 }
138
139 int ynandif_MarkNANDBlockBad(struct yaffs_dev *dev, int blockId)
140 {
141         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
142
143         return geometry->markBlockBad(dev, blockId);
144 }
145
146 int ynandif_EraseBlockInNAND(struct yaffs_dev *dev, int blockId)
147 {
148         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
149
150         return geometry->eraseBlock(dev, blockId);
151
152 }
153
154
155 static int ynandif_IsBlockOk(struct yaffs_dev *dev, int blockId)
156 {
157         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
158
159         return geometry->checkBlockOk(dev, blockId);
160 }
161
162 int ynandif_QueryNANDBlock(struct yaffs_dev *dev, int blockId,
163                 enum yaffs_block_state *state, u32 *seq_number)
164 {
165         unsigned chunkNo;
166         struct yaffs_ext_tags tags;
167
168         *seq_number = 0;
169
170         chunkNo = blockId * dev->param.chunks_per_block;
171
172         if (!ynandif_IsBlockOk(dev, blockId)) {
173                 *state = YAFFS_BLOCK_STATE_DEAD;
174         } else {
175                 ynandif_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &tags);
176
177                 if (!tags.chunk_used) {
178                         *state = YAFFS_BLOCK_STATE_EMPTY;
179                 } else {
180                         *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
181                         *seq_number = tags.seq_number;
182                 }
183         }
184
185         return YAFFS_OK;
186 }
187
188
189 int ynandif_InitialiseNAND(struct yaffs_dev *dev)
190 {
191         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
192
193         geometry->initialise(dev);
194
195         return YAFFS_OK;
196 }
197
198 int ynandif_Deinitialise_flash_fn(struct yaffs_dev *dev)
199 {
200         struct ynandif_Geometry *geometry = (struct ynandif_Geometry *)(dev->driver_context);
201
202         geometry->deinitialise(dev);
203
204         return YAFFS_OK;
205 }
206
207
208 struct yaffs_dev *
209         yaffs_add_dev_from_geometry(const YCHAR *name,
210                                         const struct ynandif_Geometry *geometry)
211 {
212         YCHAR *clonedName = malloc(sizeof(YCHAR) *
213                                 (strnlen(name, YAFFS_MAX_NAME_LENGTH)+1));
214         struct yaffs_dev *dev = malloc(sizeof(struct yaffs_dev));
215         struct yaffs_param *param;
216
217         if (dev && clonedName) {
218                 memset(dev, 0, sizeof(struct yaffs_dev));
219                 strcpy(clonedName, name);
220
221                 param = &dev->param;
222
223                 param->name = clonedName;
224                 param->write_chunk_tags_fn = ynandif_WriteChunkWithTagsToNAND;
225                 param->read_chunk_tags_fn = ynandif_ReadChunkWithTagsFromNAND;
226                 param->erase_fn = ynandif_EraseBlockInNAND;
227                 param->initialise_flash_fn = ynandif_InitialiseNAND;
228                 param->query_block_fn = ynandif_QueryNANDBlock;
229                 param->bad_block_fn = ynandif_MarkNANDBlockBad;
230                 param->n_caches = 20;
231                 param->start_block = geometry->start_block;
232                 param->end_block   = geometry->end_block;
233                 param->total_bytes_per_chunk  = geometry->dataSize;
234                 param->spare_bytes_per_chunk  = geometry->spareSize;
235                 param->inband_tags                = geometry->inband_tags;
236                 param->chunks_per_block   = geometry->pagesPerBlock;
237                 param->use_nand_ecc               = geometry->hasECC;
238                 param->is_yaffs2                  = geometry->useYaffs2;
239                 param->n_reserved_blocks          = 5;
240                 dev->driver_context               = (void *)geometry;
241
242                 yaffs_add_device(dev);
243
244                 return dev;
245         }
246
247         free(dev);
248         free(clonedName);
249
250         return NULL;
251 }