// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// \e32\drivers\medmmc\mmcptn.cpp

// 

//

#include "sdcard.h"

const TInt KDiskSectorShift = 9;

LOCAL_C void SetPartitionType(const TMMCard& aCard, TMBRPartitionEntry& aPartitionEntry)

	{

	if(aCard.IsHighCapacity())

		{

		aPartitionEntry.iPartitionType = KPartitionTypeWin95FAT32;

		}

	else if(aPartitionEntry.iNumSectors < 32680)

		{

		aPartitionEntry.iPartitionType = KPartitionTypeFAT12;

		}

	else if(aPartitionEntry.iNumSectors < 65536)

		{

		aPartitionEntry.iPartitionType = KPartitionTypeFAT16small;

		}

	else if (aPartitionEntry.iNumSectors < 1048576)

		{

		aPartitionEntry.iPartitionType = KPartitionTypeFAT16;

 		}

	else

		{

		aPartitionEntry.iPartitionType = KPartitionTypeWin95FAT32;

		}

	}

/**

Get the write block size to allow the FAT file system to calculate a suitable cluster size

*/

GLDEF_C TInt BlockSize(const TMMCard* aCardP)

	{

	if ((aCardP == NULL) || ((const TSDCard *) aCardP)->IsSDCard())

		return KMMCardHighCapBlockSize;

	const TExtendedCSD& extCSD = aCardP->ExtendedCSD();

	TInt blockSize = 

		extCSD.ExtendedCSDRev() >= 3 && extCSD.AccessSize() < 9 ? 

		512 << (extCSD.AccessSize()-1) :

			KMMCardHighCapBlockSize;			// default write block size = 512

	return blockSize;

	}

/**

Get Erase block size to allow FAT file system to align first usable cluster correctly

*/

GLDEF_C TInt EraseBlockSize(const TMMCard* aCardP)

	{

	if (aCardP == NULL)

		return 0;

	const TUint K8KBShift = 13;

	if (((const TSDCard *) aCardP)->IsSDCard())

		{

		//Allocation Unit is returned as EraseBlockSize for SD card

		//as calculation for MMC card is not valid for SD card.

		TUint8 auSize = ((const TSDCard *) aCardP)->GetAUSize();

		//eraseBlkSize is 2^(auSize + K8KBShift)

		TInt eraseBlkSize = 1 << (auSize + K8KBShift) ;

		return (eraseBlkSize);

		}

	TInt eraseBlockSize;

	// Revision 1.0 of the "File Formats Specification for MultiMediaCards" dictates that 

	// for High-Capacity MMC cards (i.e. FAT32 cards), 

	// "There shall be a Master Boot Record with valid partition information. The partition(s)

	// "and user data area(s) shall start from the beginning of an erasable unit (i.e. physical

	// "block boundary).

	// Version 1.0 of the "The MultiMediaCard FAT16 File System Specification" recommends having a 

	// 16KB MBR and aligning the root directory entry (which is also 16KB long) and the first usable 

	// sector to a 16KB boundary

	const TUint K512KBShift = 19;

	const TInt K16KBytes = 16384;

	const TExtendedCSD& extCSD = aCardP->ExtendedCSD();

	if (extCSD.ExtendedCSDRev() >= 3 && extCSD.HighCapacityEraseGroupSize() && extCSD.EraseGroupDef())

		eraseBlockSize = extCSD.HighCapacityEraseGroupSize() << K512KBShift;

	else if (aCardP->IsHighCapacity())

		eraseBlockSize = aCardP->CSD().EraseGroupSize();

	else

		eraseBlockSize = K16KBytes;

	return eraseBlockSize;

	}

/**

	Calculates the default partition information for an MMC Card

	@param aPartitionEntry The TMBRPartitionEntry to be filled in with the format parameters

	@return Standard Symbian OS Error Code

 */

GLDEF_C TInt GetMediaDefaultPartitionInfo(TMBRPartitionEntry& aPartitionEntry, TUint16& aReservedSectors, const TMMCard* aCardP)

	{

	const TUint32 KTotalSectors = I64LOW(aCardP->DeviceSize64() >> KDiskSectorShift);

	aPartitionEntry.iFirstSector = EraseBlockSize(aCardP) >> KDiskSectorShift;

	aPartitionEntry.iNumSectors  = KTotalSectors - aPartitionEntry.iFirstSector;

	aPartitionEntry.iX86BootIndicator = 0x00;

	SetPartitionType(*aCardP, aPartitionEntry);

	aReservedSectors = 0;	// Let the filesystem decide on the appropriate value..

	return(KErrNone);

	}

/**

	Returns whether having a Master Boot Record is mandatory

	@return ETrue if MBR is mandatory for this card

 */

GLDEF_C TBool MBRMandatory(const TMMCard* /*aCardP*/)

	{

	return EFalse;

	}

/**

	Returns whether to create a Master Boot Record after a format

	@return ETrue if MBR should be created

 */

GLDEF_C TBool CreateMBRAfterFormat(const TMMCard* aCardP)

	{

	if(aCardP == NULL)

		{

		return EFalse;

		}

	// Create an MBR on high capacity (FAT32) cards and optionally on low-capacity FAT16/FAT32 MMC cards

	if (aCardP->IsHighCapacity())

		{

		return ETrue;

		}

#ifdef SYMBIAN_CREATE_MBR_ON_LOW_CAPACITY_MMC

	if ((I64LOW(aCardP->DeviceSize64()) >> KDiskSectorShift) >= 32680)

		{

		return ETrue;

		}

#endif

	return EFalse;

	}

GLDEF_C TInt GetCardFormatInfo(const TMMCard* /*aCardP*/, TLDFormatInfo& /*aFormatInfo*/)

/**

 * Returns the preferred format parameters for the primary partition.

 * @return Standard Symbian OS error code.

 */

	{

	return KErrNotSupported;

	}