// Copyright (c) 2010 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 <emmcptn.h>

#include "bgahsmmcptn.h"

const TInt	  KDiskSectorShift		= 9;

const TUint32 KPIOffsetFromMediaEnd = 1;

class DBB5PartitionInfo : public DEMMCPartitionInfo

	{

public:

	 DBB5PartitionInfo();

	~DBB5PartitionInfo();

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;

	TUint32 		iPartitionAttributes[KMaxLocalDrives];

	};

DBB5PartitionInfo::DBB5PartitionInfo()

  : iSessionEndCallBack(DBB5PartitionInfo::SessionEndCallBack, this)

	{

	}

DBB5PartitionInfo::~DBB5PartitionInfo()

	{

	delete iSession;

	}

TInt DBB5PartitionInfo::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 DBB5PartitionInfo::PartitionInfo(TPartitionInfo& aInfo, const TMMCCallBack& aCallBack)

	{

	iPartitionInfo = &aInfo;

	iCallBack = aCallBack;

	// If media driver is persistent (see EMediaDriverPersistent)

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

	iSession->SetCard(iCard);

	const TUint32 ptiOffset = (I64LOW(iCard->DeviceSize64() >> KDiskSectorShift)) - KPIOffsetFromMediaEnd;

	iSession->SetupCIMReadBlock(ptiOffset, iIntBuf);

	TInt r = iDriver->InCritical();

	if (r == KErrNone)

		r = iSession->Engage();

	if(r != KErrNone)

		iDriver->EndInCritical();

	return(r);

	}

TInt DBB5PartitionInfo::PartitionCaps(TLocDrv& aDrive, TDes8& aInfo)

	{

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

	if (aDrive.iPartitionType == KPartitionTypePagedData)

		{

		Info().iFileSystemId = KDriveFileNone;

		Info().iDriveAtt |= KDriveAttHidden;

		}

	else if ( PartitionIsFAT(aDrive.iPartitionType) || PartitionIsFAT32(aDrive.iPartitionType)	)

		{		

		Info().iDriveAtt |= iPartitionAttributes[aDrive.iPartitionNumber];

		}

	return KErrNone;

	}

void DBB5PartitionInfo::SessionEndCallBack(TAny* aSelf)

	{

	DBB5PartitionInfo& self = *static_cast<DBB5PartitionInfo*>(aSelf);

	self.DoSessionEndCallBack();

	}

void DBB5PartitionInfo::DoSessionEndCallBack()

	{

	iDriver->EndInCritical();

	TInt r = iSession->EpocErrorCode();

	if (r == KErrNone)

		r = DecodePartitionInfo();

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

	}

TInt DBB5PartitionInfo::DecodePartitionInfo()

//

// decode partition info that was read into internal buffer

//

	{

	__KTRACE_OPT(KPBUSDRV, Kern::Printf(">Mmc:PartitionInfo()"));

	TUint partitionCount = iPartitionInfo->iPartitionCount = 0;

	// For internal devices it is only valid to report up to 1 SWAP partition

	TBool foundSwap = EFalse;

	BGAHSMMCPTN_PI_STR *partitionTable = (BGAHSMMCPTN_PI_STR*)(&iIntBuf[0]);

	// Verify that this is the Nokia partition table

		{

		__KTRACE_OPT(KPBUSDRV, Kern::Printf("Nokia partition structure found"));

	// Validate partition address boundaries

	if(partitionCount == 0)

		{

		__KTRACE_OPT(KPBUSDRV, Kern::Printf("Mmc: No supported partitions found!"));

		return KErrCorrupt;

		}

	else

		{

		// at least one entry for a supported partition found

		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;

			}

		// Go through all partition entries and check boundaries

		for(TInt 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 - check #%d", i));

				return KErrCorrupt;

				}

			}

		}

	iPartitionInfo->iPartitionCount = partitionCount;

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

	//Notify medmmc that partitioninfo is complete.

	iCallBack.CallBack();

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

	return KErrNone;

	}

// End - DBB5PartitionInfo

EXPORT_C DEMMCPartitionInfo* CreateEmmcPartitionInfo()

	{

	return new DBB5PartitionInfo;

	}

DECLARE_STANDARD_EXTENSION()

	{

	return KErrNone;

	}

//	End of File