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1 // Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // \e32\drivers\medmmc\mmcptn.cpp |
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15 // |
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16 // |
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17 |
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18 #include "sdcard.h" |
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19 |
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20 const TInt KDiskSectorShift = 9; |
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21 |
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22 LOCAL_C void SetPartitionType(const TMMCard& aCard, TMBRPartitionEntry& aPartitionEntry) |
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23 { |
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24 if(aCard.IsHighCapacity()) |
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25 { |
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26 aPartitionEntry.iPartitionType = KPartitionTypeWin95FAT32; |
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27 } |
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28 else if(aPartitionEntry.iNumSectors < 32680) |
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29 { |
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30 aPartitionEntry.iPartitionType = KPartitionTypeFAT12; |
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31 } |
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32 else if(aPartitionEntry.iNumSectors < 65536) |
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33 { |
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34 aPartitionEntry.iPartitionType = KPartitionTypeFAT16small; |
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35 } |
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36 else if (aPartitionEntry.iNumSectors < 1048576) |
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37 { |
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38 aPartitionEntry.iPartitionType = KPartitionTypeFAT16; |
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39 } |
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40 else |
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41 { |
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42 aPartitionEntry.iPartitionType = KPartitionTypeWin95FAT32; |
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43 } |
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44 } |
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45 |
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46 /** |
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47 Get the write block size to allow the FAT file system to calculate a suitable cluster size |
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48 */ |
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49 GLDEF_C TInt BlockSize(const TMMCard* aCardP) |
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50 { |
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51 if ((aCardP == NULL) || ((const TSDCard *) aCardP)->IsSDCard()) |
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52 return KMMCardHighCapBlockSize; |
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53 |
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54 const TExtendedCSD& extCSD = aCardP->ExtendedCSD(); |
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55 |
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56 TInt blockSize = |
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57 extCSD.ExtendedCSDRev() >= 3 && extCSD.AccessSize() < 9 ? |
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58 512 << (extCSD.AccessSize()-1) : |
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59 KMMCardHighCapBlockSize; // default write block size = 512 |
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60 |
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61 return blockSize; |
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62 } |
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63 |
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64 /** |
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65 Get Erase block size to allow FAT file system to align first usable cluster correctly |
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66 */ |
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67 GLDEF_C TInt EraseBlockSize(const TMMCard* aCardP) |
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68 { |
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69 if (aCardP == NULL) |
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70 return 0; |
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71 |
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72 |
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73 const TUint K8KBShift = 13; |
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74 if (((const TSDCard *) aCardP)->IsSDCard()) |
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75 { |
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76 //Allocation Unit is returned as EraseBlockSize for SD card |
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77 //as calculation for MMC card is not valid for SD card. |
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78 TUint8 auSize = ((const TSDCard *) aCardP)->GetAUSize(); |
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79 //eraseBlkSize is 2^(auSize + K8KBShift) |
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80 TInt eraseBlkSize = 1 << (auSize + K8KBShift) ; |
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81 return (eraseBlkSize); |
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82 } |
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83 |
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84 |
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85 TInt eraseBlockSize; |
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86 |
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87 // Revision 1.0 of the "File Formats Specification for MultiMediaCards" dictates that |
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88 // for High-Capacity MMC cards (i.e. FAT32 cards), |
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89 // "There shall be a Master Boot Record with valid partition information. The partition(s) |
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90 // "and user data area(s) shall start from the beginning of an erasable unit (i.e. physical |
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91 // "block boundary). |
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92 // Version 1.0 of the "The MultiMediaCard FAT16 File System Specification" recommends having a |
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93 // 16KB MBR and aligning the root directory entry (which is also 16KB long) and the first usable |
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94 // sector to a 16KB boundary |
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95 |
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96 const TUint K512KBShift = 19; |
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97 const TInt K16KBytes = 16384; |
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98 const TExtendedCSD& extCSD = aCardP->ExtendedCSD(); |
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99 |
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100 if (extCSD.ExtendedCSDRev() >= 3 && extCSD.HighCapacityEraseGroupSize() && extCSD.EraseGroupDef()) |
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101 eraseBlockSize = extCSD.HighCapacityEraseGroupSize() << K512KBShift; |
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102 else if (aCardP->IsHighCapacity()) |
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103 eraseBlockSize = aCardP->CSD().EraseGroupSize(); |
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104 else |
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105 eraseBlockSize = K16KBytes; |
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106 |
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107 return eraseBlockSize; |
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108 } |
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109 |
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110 /** |
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111 Calculates the default partition information for an MMC Card |
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112 @param aPartitionEntry The TMBRPartitionEntry to be filled in with the format parameters |
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113 @return Standard Symbian OS Error Code |
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114 */ |
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115 GLDEF_C TInt GetMediaDefaultPartitionInfo(TMBRPartitionEntry& aPartitionEntry, TUint16& aReservedSectors, const TMMCard* aCardP) |
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116 { |
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117 const TUint32 KTotalSectors = I64LOW(aCardP->DeviceSize64() >> KDiskSectorShift); |
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118 |
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119 aPartitionEntry.iFirstSector = EraseBlockSize(aCardP) >> KDiskSectorShift; |
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120 aPartitionEntry.iNumSectors = KTotalSectors - aPartitionEntry.iFirstSector; |
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121 aPartitionEntry.iX86BootIndicator = 0x00; |
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122 SetPartitionType(*aCardP, aPartitionEntry); |
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123 |
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124 aReservedSectors = 0; // Let the filesystem decide on the appropriate value.. |
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125 |
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126 return(KErrNone); |
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127 } |
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128 |
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129 /** |
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130 Returns whether having a Master Boot Record is mandatory |
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131 |
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132 @return ETrue if MBR is mandatory for this card |
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133 */ |
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134 GLDEF_C TBool MBRMandatory(const TMMCard* /*aCardP*/) |
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135 { |
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136 return EFalse; |
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137 } |
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138 /** |
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139 Returns whether to create a Master Boot Record after a format |
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140 |
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141 @return ETrue if MBR should be created |
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142 */ |
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143 GLDEF_C TBool CreateMBRAfterFormat(const TMMCard* aCardP) |
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144 { |
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145 if(aCardP == NULL) |
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146 { |
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147 return EFalse; |
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148 } |
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149 |
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150 // Create an MBR on high capacity (FAT32) cards and optionally on low-capacity FAT16/FAT32 MMC cards |
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151 if (aCardP->IsHighCapacity()) |
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152 { |
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153 return ETrue; |
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154 } |
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155 #ifdef SYMBIAN_CREATE_MBR_ON_LOW_CAPACITY_MMC |
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156 if ((I64LOW(aCardP->DeviceSize64()) >> KDiskSectorShift) >= 32680) |
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157 { |
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158 return ETrue; |
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159 } |
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160 #endif |
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161 |
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162 return EFalse; |
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163 } |
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164 |
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165 GLDEF_C TInt GetCardFormatInfo(const TMMCard* /*aCardP*/, TLDFormatInfo& /*aFormatInfo*/) |
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166 /** |
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167 * Returns the preferred format parameters for the primary partition. |
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168 * @return Standard Symbian OS error code. |
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169 */ |
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170 { |
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171 return KErrNotSupported; |
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172 } |
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173 |