// Copyright (c) 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:

// Partition Management for Embedded MMC devices

// 

//

#include <drivers/emmcptn.h>

const TInt KDiskSectorShift=9;

class DLegacyEMMCPartitionInfo : public DEMMCPartitionInfo

	{

public:

	 DLegacyEMMCPartitionInfo();

	~DLegacyEMMCPartitionInfo();

public:

	virtual TInt Initialise(DMediaDriver* aDriver);

	virtual TInt PartitionInfo(TPartitionInfo& anInfo, const TMMCCallBack& aCallBack);

	virtual TInt PartitionCaps(TLocDrv& aDrive, TDes8& aInfo);

protected:

	void SetPartitionEntry(TPartitionEntry* aEntry, TUint aFirstSector, TUint aNumSectors);

private:

	static void SessionEndCallBack(TAny* aSelf);

		   void DoSessionEndCallBack();

	virtual TInt DecodePartitionInfo();

protected:

	DMediaDriver*   iDriver;

	TPartitionInfo* iPartitionInfo;

	TMMCCallBack	iSessionEndCallBack;

	TMMCCallBack 	iCallBack;         // Where to report the PartitionInfo completion

	DMMCSession*	iSession;

	TMMCard*		iCard;

	TUint8*			iIntBuf;

	};

DLegacyEMMCPartitionInfo::DLegacyEMMCPartitionInfo()

  : iSessionEndCallBack(DLegacyEMMCPartitionInfo::SessionEndCallBack, this)

	{

	}

DLegacyEMMCPartitionInfo::~DLegacyEMMCPartitionInfo()

	{

	delete iSession;

	}

TInt DLegacyEMMCPartitionInfo::Initialise(DMediaDriver* aDriver)

	{

	iDriver = aDriver;

	DMMCSocket* socket = ((DMMCSocket*)((DPBusPrimaryMedia*)(iDriver->iPrimaryMedia))->iSocket);

	if(socket == NULL)

		return(KErrNoMemory);

	DMMCStack* stack = socket->Stack(0);

	iCard = stack->CardP(((DPBusPrimaryMedia*)(iDriver->iPrimaryMedia))->iSlotNumber);

	iSession = stack->AllocSession(iSessionEndCallBack);

	if (iSession == NULL)

		return(KErrNoMemory);

	iSession->SetStack(stack);

	iSession->SetCard(iCard);

	// this gets used before any access

	TInt bufLen, minorBufLen;

	stack->BufferInfo(iIntBuf, bufLen, minorBufLen);

	return(KErrNone);

	}

TInt DLegacyEMMCPartitionInfo::PartitionInfo(TPartitionInfo& anInfo, const TMMCCallBack& aCallBack)

	{

	iPartitionInfo = &anInfo;

	iCallBack = aCallBack;

	// If media driver is persistent (see EMediaDriverPersistent), 

	// the card may have changed since last power down, so reset CID

	iSession->SetCard(iCard);

	iSession->SetupCIMReadBlock(0, iIntBuf);

	TInt r = iDriver->InCritical();

	if (r == KErrNone)

		r = iSession->Engage();

	if(r != KErrNone)

		iDriver->EndInCritical();

	return(r);

	}

TInt DLegacyEMMCPartitionInfo::PartitionCaps(TLocDrv& aDrive, TDes8& aInfo)

	{

	 TLocalDriveCapsV6Buf& Info = static_cast< TLocalDriveCapsV6Buf&> (aInfo);

	// is this query for the swap partition ?

	if (aDrive.iPartitionType == KPartitionTypePagedData)

		{

		Info().iFileSystemId = KDriveFileNone;

		Info().iDriveAtt|= KDriveAttHidden;

		}

	// is this query for the ROFS partition ?

	if (aDrive.iPartitionType == KPartitionTypeRofs)

		{

		Info().iFileSystemId = KDriveFileSysROFS;

		Info().iMediaAtt&= ~KMediaAttFormattable;

		Info().iMediaAtt|= KMediaAttWriteProtected;

		}

	// is this query for the ROM partition ?

	if (aDrive.iPartitionType == KPartitionTypeROM)

		{

		Info().iFileSystemId = KDriveFileNone;

		Info().iMediaAtt&= ~KMediaAttFormattable;

		Info().iMediaAtt|= KMediaAttWriteProtected;

		}

	return KErrNone;

	}

void DLegacyEMMCPartitionInfo::SessionEndCallBack(TAny* aSelf)

	{

	DLegacyEMMCPartitionInfo& self = *static_cast<DLegacyEMMCPartitionInfo*>(aSelf);

	self.DoSessionEndCallBack();

	}

void DLegacyEMMCPartitionInfo::DoSessionEndCallBack()

	{

	iDriver->EndInCritical();

	TInt r = iSession->EpocErrorCode();

	if (r == KErrNone)

		r = DecodePartitionInfo();

	iDriver->PartitionInfoComplete(r == KErrNone ? r : KErrNotReady);

	}

TInt DLegacyEMMCPartitionInfo::DecodePartitionInfo()

//

// decode partition info that was read into internal buffer 

//

	{

	TUint partitionCount=iPartitionInfo->iPartitionCount=0;

	TInt defaultPartitionNumber=-1;

	TMBRPartitionEntry* pe;

	const TUint KMBRFirstPartitionOffsetAligned = KMBRFirstPartitionOffset & ~3;

	TInt i;

	// Read of the first sector successful so check for a Master Boot Record

	if (*(TUint16*)(&iIntBuf[KMBRSignatureOffset])!=0xAA55)

		// If no valid signature give up now, No way to re-format an internal drive correctly

		return KErrCorrupt;

	__ASSERT_COMPILE(KMBRFirstPartitionOffsetAligned + KMBRMaxPrimaryPartitions * sizeof(TMBRPartitionEntry) <= KMBRSignatureOffset);

	memmove(&iIntBuf[0], &iIntBuf[2],

		KMBRFirstPartitionOffsetAligned + KMBRMaxPrimaryPartitions * sizeof(TMBRPartitionEntry)); 

	for (i=0, pe = (TMBRPartitionEntry*)(&iIntBuf[KMBRFirstPartitionOffsetAligned]);

		pe->iPartitionType != 0 && i < KMaxPartitionEntries; i++,pe--)

		{

		if (pe->IsDefaultBootPartition())

			{

			SetPartitionEntry(&iPartitionInfo->iEntry[0],pe->iFirstSector,pe->iNumSectors);

			defaultPartitionNumber=i;

			partitionCount++;

			break;

			}

		}

	// Now add any other partitions

	for (i=0, pe = (TMBRPartitionEntry*)(&iIntBuf[KMBRFirstPartitionOffsetAligned]);

		pe->iPartitionType != 0 && i < KMaxPartitionEntries; i++,pe--)

		{

		if (defaultPartitionNumber==i)

			{

			// Already sorted

			}

		// FAT partition ?

			{

			SetPartitionEntry(&iPartitionInfo->iEntry[partitionCount],pe->iFirstSector,pe->iNumSectors);

			__KTRACE_OPT(KLOCDPAGING, Kern::Printf("Mmc: FAT partition found at sector #%u", pe->iFirstSector));

			partitionCount++;

			}

		else if (pe->iPartitionType == KPartitionTypeROM)

			{

			TPartitionEntry& partitionEntry = iPartitionInfo->iEntry[partitionCount];

			SetPartitionEntry(&iPartitionInfo->iEntry[partitionCount],pe->iFirstSector,pe->iNumSectors);

			partitionEntry.iPartitionType = pe->iPartitionType;

			partitionCount++;				 

			__KTRACE_OPT(KLOCDPAGING, Kern::Printf("Mmc: KPartitionTypeROM found at sector #%u", pe->iFirstSector));

			}

		// ROFS partition ?

		else if (pe->iPartitionType == KPartitionTypeRofs)

			{

// Don't expose this for normal operation only boot?			

			TPartitionEntry& partitionEntry = iPartitionInfo->iEntry[partitionCount];

			SetPartitionEntry(&iPartitionInfo->iEntry[partitionCount],pe->iFirstSector,pe->iNumSectors);

			partitionEntry.iPartitionType = pe->iPartitionType;

			__KTRACE_OPT(KLOCDPAGING, Kern::Printf("Mmc: KPartitionTypeRofs found at sector #%u", pe->iFirstSector));

			partitionCount++;

			}

		// Swap partition ?

		else if (pe->iPartitionType == KPartitionTypePagedData)

			{

			__KTRACE_OPT(KLOCDPAGING, Kern::Printf("Mmc: KPartitionTypePagedData found at sector #%u", pe->iFirstSector));

			TPartitionEntry& partitionEntry = iPartitionInfo->iEntry[partitionCount];

			SetPartitionEntry(&iPartitionInfo->iEntry[partitionCount],pe->iFirstSector,pe->iNumSectors);

			partitionEntry.iPartitionType = pe->iPartitionType;

			partitionCount++;

			}

		}

	// Check the validity of the partition address boundaries

	// If there is any MBR errors

	if(partitionCount > 0)

		{

		const TInt64 deviceSize = iCard->DeviceSize64();

		TPartitionEntry& part = iPartitionInfo->iEntry[partitionCount - 1];

		// Check that the card address space boundary is not exceeded by the last partition

		if(part.iPartitionBaseAddr + part.iPartitionLen > deviceSize)

			{

			__KTRACE_OPT(KPBUSDRV, Kern::Printf("Mmc: MBR partition exceeds card memory space"));

			return KErrCorrupt;

			}

		// More than one partition. Go through all of them

		if (partitionCount > 0)

			{

			for(i=partitionCount-1; i>0; i--)

				{

				const TPartitionEntry& curr = iPartitionInfo->iEntry[i];

				TPartitionEntry& prev = iPartitionInfo->iEntry[i-1];

				// Check if partitions overlap

				if(curr.iPartitionBaseAddr < (prev.iPartitionBaseAddr + prev.iPartitionLen))

					{

					__KTRACE_OPT(KPBUSDRV, Kern::Printf("Mmc: Overlapping partitions"));

					return KErrCorrupt;

					}

				}

			}

		}

	if (defaultPartitionNumber==(-1) && partitionCount==0)

		{

		__KTRACE_OPT(KPBUSDRV, Kern::Printf("No Valid Partitions Found!"));

		return KErrCorrupt;

		}

	iPartitionInfo->iPartitionCount=partitionCount;

	iPartitionInfo->iMediaSizeInBytes=iCard->DeviceSize64();

#ifdef _DEBUG

	__KTRACE_OPT(KPBUSDRV, Kern::Printf("<Mmc:PartitionInfo (C:%d)",partitionCount));

	for (TUint x=0; x<partitionCount; x++)

		__KTRACE_OPT(KPBUSDRV, Kern::Printf("     Partition%d (B:%xH L:%xH)",x,I64LOW(iPartitionInfo->iEntry[x].iPartitionBaseAddr),I64LOW(iPartitionInfo->iEntry[x].iPartitionLen)));

#endif

	//Notify medmmc that partitioninfo is complete.

	iCallBack.CallBack();

	return(KErrNone);

	}

void DLegacyEMMCPartitionInfo::SetPartitionEntry(TPartitionEntry* aEntry, TUint aFirstSector, TUint aNumSectors)

//

// auxiliary static function to record partition information in TPartitionEntry object

//

	{

	aEntry->iPartitionBaseAddr=aFirstSector;

	aEntry->iPartitionBaseAddr<<=KDiskSectorShift;

	aEntry->iPartitionLen=aNumSectors;

	aEntry->iPartitionLen<<=KDiskSectorShift;

	aEntry->iPartitionType=KPartitionTypeFAT12;

	}

// End - DLegacyEMMCPartitionInfo

EXPORT_C DEMMCPartitionInfo* CreateEmmcPartitionInfo()

	{

	return new DLegacyEMMCPartitionInfo;

	}

DECLARE_STANDARD_EXTENSION()

	{

	return KErrNone;

	}