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annotate packages/fs/yaffs/current/src/ecos-yaffs-nand.c @ 338:138c9338c4cc

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Update for changes to NAND interface
author Ross Younger <wry@ecoscentric.com>
date Thu, 12 Nov 2009 13:42:03 +0000
parents 8e1210f7946a
children 531f5810eaf7
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1 //=============================================================================
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2 //
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3 // ecos-yaffs-nand.c
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4 //
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5 // Glue for YAFFS to the eCos NAND library
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6 //
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7 //=============================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 2009 eCosCentric Limited.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //=============================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): wry
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43 // Date: 2009-05-07
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44 //
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45 //####DESCRIPTIONEND####
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46 //=============================================================================
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47
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48 #include "ecos-yaffs.h"
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49 #include "ecos-yaffs-nand.h"
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50 #include "yaffs_packedtags1.h"
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51 #include "yaffs_packedtags2.h"
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52 #include "yaffs_tagscompat.h"
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53 #include <cyg/nand/util.h> // for BLOCK2PAGEADDR
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54
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55 int eyaffs_initialiseNAND (struct yaffs_DeviceStruct * dev)
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56 {
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57 // Nothing to do - we've already inited it in mount().
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58 //cyg_nand_partition *part = (cyg_nand_partition*) dev->genericDevice;
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59 return YAFFS_OK;
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60 }
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61
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62 int eyaffs_deinitialiseNAND (struct yaffs_DeviceStruct * dev)
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63 {
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64 // Nothing to do
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65 //cyg_nand_partition *part = (cyg_nand_partition*) dev->genericDevice;
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66 return YAFFS_OK;
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67 }
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68
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69 int eyaffs_eraseBlockInNAND (struct yaffs_DeviceStruct * dev, int blockInNAND)
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70 {
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71 cyg_nand_partition *part = (cyg_nand_partition*) dev->genericDevice;
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72 int rv = cyg_nand_erase_block(part, blockInNAND);
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73 return rv==0 ? YAFFS_OK : YAFFS_FAIL;
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74 }
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75
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76 int eyaffs_writeChunkWithTagsToNAND (struct yaffs_DeviceStruct * dev,
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77 int chunkInNAND, const __u8 * data,
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78 const yaffs_ExtendedTags * tags)
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79 {
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80 cyg_nand_partition *part = (cyg_nand_partition*) dev->genericDevice;
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81 int rv;
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82
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83 if (!dev->isYaffs2) {
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84 #ifdef CONFIG_YAFFS_NO_YAFFS1
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85 rv = 1;
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86 #else
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87 yaffs_PackedTags1 pt1;
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88
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89 if (tags->chunkDeleted) {
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90 memset(&pt1, 0xff, sizeof(pt1));
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91 pt1.deleted = 0;
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92 //((CYG_BYTE*)&pt1)[8] = 0; // TODO: support 9BYTE_TAGS, if there is a demand to (requires corresponding fixup in the ECC check below)
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93 } else {
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94 yaffs_PackTags1(&pt1, tags);
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95 yaffs_CalcTagsECC((yaffs_Tags *)&pt1);
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96 }
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97 rv = cyg_nand_write_page(part, chunkInNAND, data, &pt1, PACKEDTAGS1_OOBSIZE);
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98 #endif
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99 } else {
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100 #ifdef CYGSEM_FS_YAFFS_OMIT_YAFFS2_CODE
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101 return YAFFS_FAIL;
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102 #else
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103 // YAFFS2 mode.
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104 // N.B. We are not doing ECC - the NAND layer does that - so don't
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105 // need to bother with the whole tags struct, just the bit that matters.
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106
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107 if (!data || !tags) {
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108 T(YAFFS_TRACE_ERROR,
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109 (TSTR("**>> yaffs2: both data and tags must be present" TENDSTR)));
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110 YBUG();
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111 return YAFFS_FAIL;
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112 }
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113
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114 if (dev->inbandTags) {
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115 yaffs_PackedTags2TagsPart *pt2tp;
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116 pt2tp = (yaffs_PackedTags2TagsPart *)(data + dev->nDataBytesPerChunk);
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117 yaffs_PackTags2TagsPart(pt2tp, tags);
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118 rv = cyg_nand_write_page(part, chunkInNAND, data, 0, 0);
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119 } else {
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120 yaffs_PackedTags2 pt;
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121 void *packed_tags_ptr = dev->noTagsECC ? (void*) &pt.t : (void*) &pt;
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122 yaffs_PackTags2(dev, &pt, tags);
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123 rv = cyg_nand_write_page(part, chunkInNAND, data, packed_tags_ptr, PACKEDTAGS2_OOBSIZE(dev));
300
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124 }
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125 #endif
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126 }
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127
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128 // all done:
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129 return rv==0 ? YAFFS_OK : YAFFS_FAIL;
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130 }
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131
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132 int eyaffs_readChunkWithTagsFromNAND (struct yaffs_DeviceStruct * dev,
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133 int chunkInNAND, __u8 * data,
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134 yaffs_ExtendedTags * tags)
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135 {
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136 cyg_nand_partition *part = (cyg_nand_partition*) dev->genericDevice;
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137 int localData = 0;
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138 int rv;
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139
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140 if (!dev->isYaffs2) {
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141 #ifdef CONFIG_YAFFS_NO_YAFFS1
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142 rv = 1;
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143 #else
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144 yaffs_PackedTags1 pt1;
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145 memset(&pt1, 0xff, sizeof(yaffs_PackedTags1));
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146
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147 rv = cyg_nand_read_page(part, chunkInNAND, data, &pt1, PACKEDTAGS1_OOBSIZE);
300
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148
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149 if (rv == 0) {
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150 if (yaffs_CheckFF((CYG_BYTE*)&pt1, 8)) {
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151 // block is empty
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152 if (tags) {
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153 memset(tags, 0, sizeof(*tags));
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154 tags->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
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155 }
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156 } else {
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157 // must check and correct tags' mini-ecc.
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158 int deleted = !pt1.deleted; // this would break the tags ECC.
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159 pt1.deleted = 1;
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160 // TODO: support 9BYTE_TAGS if there is a demand.
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161 int rv2 = yaffs_CheckECCOnTags((yaffs_Tags *)&pt1);
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162 if (rv2 < 0) {
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163 T(YAFFS_TRACE_ERROR,
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164 (TSTR ("**>>yaffs ecc error unfixed on chunk %d:0"
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165 TENDSTR), chunkInNAND));
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166 dev->eccUnfixed++;
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167 rv = EIO;
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168 } else {
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169 if (tags) {
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170 yaffs_UnpackTags1(tags, &pt1);
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171 tags->chunkDeleted = deleted;
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172 tags->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
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173 }
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174
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175 if (rv2 > 0) {
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176 T(YAFFS_TRACE_ERROR,
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177 (TSTR ("**>>yaffs ecc tags error fix performed on chunk %d:0"
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178 TENDSTR), chunkInNAND));
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179 dev->eccFixed++;
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180 if (tags)
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181 tags->eccResult = YAFFS_ECC_RESULT_FIXED;
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182 }
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183 }
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184 }
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185 } // else reading the NAND failed; drop out
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186 #endif
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187
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188 } else { // YAFFS2 mode
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189 #ifdef CYGSEM_FS_YAFFS_OMIT_YAFFS2_CODE
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190 return YAFFS_FAIL;
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191 #else
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192 if (dev->inbandTags) {
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193 if (!data) {
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194 localData = 1;
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195 data = yaffs_GetTempBuffer(dev, __LINE__);
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196 }
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197
338
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198 rv = cyg_nand_read_page(part, chunkInNAND, data, 0, 0);
300
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199 if (tags) {
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200 yaffs_PackedTags2TagsPart *pt2tp;
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201 pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->nDataBytesPerChunk];
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202 yaffs_UnpackTags2TagsPart(tags, pt2tp);
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203 }
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204 } else {
311
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205 yaffs_PackedTags2 pt;
325
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206 void *packed_tags_ptr = dev->noTagsECC ? (void*) &pt.t : (void*) &pt;
338
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207 rv = cyg_nand_read_page(part, chunkInNAND, data, packed_tags_ptr, tags ? PACKEDTAGS2_OOBSIZE(dev) : 0);
300
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208 if (tags)
325
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209 yaffs_UnpackTags2(dev, tags, &pt);
300
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210 }
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211 #endif
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212 }
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213
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214 // all done:
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215 if (localData)
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216 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
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217
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218 if (rv != 0) {
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219 if (tags) {
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220 // mark the tags as clearly useless
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221 memset(tags, 0, sizeof(yaffs_ExtendedTags));
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222 tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;
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223 tags->blockBad = 1;
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224 }
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225 return YAFFS_FAIL;
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226 }
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227 return YAFFS_OK;
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228 // TODO: go through yaffs_guts and ensure that all calls to ReadChunksWithTagsFromNAND DTRT on FAIL or if the read tags aren't valid.
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229 }
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230
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231 int eyaffs_markNANDBlockBad (struct yaffs_DeviceStruct * dev, int blockNo)
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232 {
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233 cyg_nand_partition *part = (cyg_nand_partition*) dev->genericDevice;
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234 int rv = cyg_nand_bbt_markbad(part, blockNo);
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235 return rv==0 ? YAFFS_OK : YAFFS_FAIL;
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236 }
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237
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238 int eyaffs_queryNANDBlock (struct yaffs_DeviceStruct * dev, int blockNo,
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239 yaffs_BlockState * state, __u32 *sequenceNumber)
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240 {
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241 yaffs_ExtendedTags tags;
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242 cyg_nand_page_addr pg;
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243 cyg_nand_partition *part = (cyg_nand_partition*) dev->genericDevice;
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244
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245 int rv = cyg_nand_bbt_query(part, blockNo);
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246 if (rv < 0) return YAFFS_FAIL;
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247
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248 switch(rv) {
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249 case CYG_NAND_BBT_OK:
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250 // Now we need to read the tags from the OOB area of the first page
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251 pg = CYG_NAND_BLOCK2PAGEADDR(part->dev, blockNo);
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252 // TODO: This is quite inefficient on small page devices in
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253 // YAFFS2 mode with inbandTags enabled, as the whole page has
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254 // to be read. Some day, it would be nice to implement part-page
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255 // reads in the NAND layer where this can be efficiently done.
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256 int rv2 = eyaffs_readChunkWithTagsFromNAND(dev, pg, 0, &tags);
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257 if (rv2 == YAFFS_FAIL) {
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258 (void) cyg_nand_bbt_markbad(part, blockNo);
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259 goto deadblock;
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260 }
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261 if (tags.chunkUsed) {
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262 *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
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263 *sequenceNumber = tags.sequenceNumber;
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264 return YAFFS_OK;
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265 }
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266 *state = YAFFS_BLOCK_STATE_EMPTY;
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267 *sequenceNumber = 0;
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268 return YAFFS_OK;
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269
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270 case CYG_NAND_BBT_WORNBAD:
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271 case CYG_NAND_BBT_RESERVED:
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272 case CYG_NAND_BBT_FACTORY_BAD:
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273 deadblock:
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274 *state = YAFFS_BLOCK_STATE_DEAD;
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275 *sequenceNumber = 0;
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276 return YAFFS_OK;
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277 default:
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278 YBUG(); // can't happen
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279 return YAFFS_FAIL;
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280 }
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281 }
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282