/*

* Copyright (c) 2007-2009 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: 

*

*/

/**

 @file

 @internalComponent

 @released

*/

#include <kernel/kern_priv.h>

#include "cryptodriver.h"

#ifdef __MARM__

#include <omap_hrp/assp/shared/omap_reg.h>

#include <omap_hrp/assp/shared/omap_interrupt.h>

#endif

//#include "cryptoh4.h"

#include "cryptoldd.h"

#include "cryptoh4rng.h"

inline void CryptoH4JobRandom::EnableIsr()

	{

	TRACE_FUNCTION("EnableIsr");

	//	Kern::Printf("EI");

	SetRunning(ETrue);

#ifdef __MARM__

	// Enable RNG interrupt. This interrupt will then queue the

	// "random number ready" DFC

	TInt32 tmp = TOmap::Register32(KHwBaseRngReg + KHoRng_Mask);

	tmp |= 4;

	TOmap::SetRegister32(KHwBaseRngReg + KHoRng_Mask, tmp);

#else

	// Not on real h/w so just queue the DFC...

	// Queue the "random number ready" DFC

	iRandomDfc.Enque(); // Queue from task level

#endif

	}

inline void CryptoH4JobRandom::DisableIsr()

	{

	TRACE_FUNCTION("DisableIsr");

	//	Kern::Printf("DI");

#ifdef __MARM__

	TInt32 tmp = TOmap::Register32(KHwBaseRngReg + KHoRng_Mask);

	tmp &= ~4;

	TOmap::SetRegister32(KHwBaseRngReg + KHoRng_Mask, tmp);

#endif

	}

CryptoH4JobRandom::CryptoH4JobRandom(DLddChanRandom &aLddChanRandom)

	: iLddChanRandom(aLddChanRandom),

	  iJobSizeInBytes(0),

	  iSwReadByteOffset(0),

	  iHw32Index(0),

	  iIsrHooked(EFalse),

	  iRandomDfc(RandomDfc, this, 1) // DFC is priority '1'

	{

	TRACE_FUNCTION("CryptoH4JobRandom");

	//	Kern::Printf("CryptoH4JobRandom::CryptoH4JobRandom %x", this);

	}

CryptoH4JobRandom::~CryptoH4JobRandom()

	{

	TRACE_FUNCTION("~CryptoH4JobRandom");

	//	Kern::Printf("CryptoH4JobRandom::~CryptoH4JobRandom %x", this);

	UnHookIsr();

	}

void CryptoH4JobRandom::SetDfcQ(TDfcQue *aDfcQue)

	{

	TRACE_FUNCTION("SetDfcQ");

	iRandomDfc.SetDfcQ(aDfcQue);

	}

void CryptoH4JobRandom::SetDetails(DCryptoJobScheduler *aJobScheduler, 

								   MCryptoJobCallbacks *aCallbacks,

								   TUint32 aNumOfBytes)

	{

	TRACE_FUNCTION("SetDetails");

	//	Kern::Printf("CryptoH4JobRandom::SetDetails");

	iJobScheduler = aJobScheduler;

	iCallbacks = aCallbacks;

	iJobSizeInBytes = aNumOfBytes;

	}

void CryptoH4JobRandom::GetToPddBuffer(TUint8 * &aBuf, TUint32 &aBufLen, TBool &aMore)

	{

	TRACE_FUNCTION("GetToPddBuffer");

	aBuf = 0;

	aBufLen = 0;

	aMore = EFalse;

	}

void CryptoH4JobRandom::BytesWrittenToPdd(TUint32)

	{

	TRACE_FUNCTION("BytesWrittenToPdd");

	}

void CryptoH4JobRandom::GetFromPddBuffer(TUint8 * &aBuf, TUint32 &aBufLen, TBool &aMore)

	{

	TRACE_FUNCTION("GetFromPddBuffer");

	TInt hw8Index = iHw32Index * 4;

	TUint8 *p = (TUint8 *) iRandomBuffer;

	aBuf = &p[iSwReadByteOffset];

	TInt len = hw8Index - iSwReadByteOffset;

	if(len >= 0)

		{

		aBufLen = len;

		aMore = EFalse;

		}

	else

		{

		// Wrap round condition, but can only return contiguous bytes

		aBufLen = sizeof(iRandomBuffer) - iSwReadByteOffset;

		aMore = ETrue;

		return;

		}

	}

void CryptoH4JobRandom::BytesReadFromPdd(TUint32 aBytes)

	{

	TRACE_FUNCTION("BytesReadFromPdd");

	iSwReadByteOffset += aBytes;

	if(iSwReadByteOffset >= sizeof(iRandomBuffer))

		{

		iSwReadByteOffset -= sizeof(iRandomBuffer);

		}

	iJobSizeInBytes -= aBytes;

	}

void CryptoH4JobRandom::DoSlice(TBool aFirstSlice)

	{

	TRACE_FUNCTION("DoSlice");

	//	Kern::Printf("DoSlice(%d)", aFirstSlice);

	if(aFirstSlice)

		{

		HookIsr();

		}

	// Enable RNG interrupt. The interrupt will then queue the

	// "random number ready" DFC when the h/w is ready.

	// (when not on h/w, this immediately queues a DFC)

	EnableIsr();

	}

TBool CryptoH4JobRandom::DoSaveState()

	{

	TRACE_FUNCTION("DoSaveState");

	UnHookIsr();

	return ETrue; // We want DoRestoreState to be called

	}

void CryptoH4JobRandom::DoRestoreState()

	{

	TRACE_FUNCTION("DoRestoreState");

	HookIsr();

	}

void CryptoH4JobRandom::DoReleaseHw()

	{

	TRACE_FUNCTION("DoReleaseHw");

	// Disable RNG interrupt

	DisableIsr();

	// Disable/unhook ISR

	UnHookIsr();

	// Cancel DFC

	iRandomDfc.Cancel();

	}

TInt CryptoH4JobRandom::BytesAvailable() const

	{

	TRACE_FUNCTION("BytesAvailable");

	TInt hw8Index = iHw32Index * 4;

	TInt available = hw8Index - iSwReadByteOffset;

	if(available < 0)

		{

		available += sizeof(iRandomBuffer);

		}

	return available;	

	}

void CryptoH4JobRandom::RegionsAvailable(TUint8 * &aPtr1, TInt &aLen1, 

										 TUint8 * &aPtr2, TInt &aLen2) const

	{

	TRACE_FUNCTION("RegionsAvailable");

	TInt hw8Index = iHw32Index * 4;

	TUint8 *p = (TUint8 *) iRandomBuffer;

	aPtr1 = &p[iSwReadByteOffset];

	TInt len = hw8Index - iSwReadByteOffset;

	if(len < 0)

		{

		// Available data crosses buffer end so return two regions

		aLen1 = sizeof(iRandomBuffer) - iSwReadByteOffset;

		aPtr2 = &p[0];

		aLen2 = hw8Index;

		}

	else

		{

		// Available buffer is contiguous

		aLen1 = len;

		aPtr2 = 0;

		aLen2 = 0;

		}

	}

void CryptoH4JobRandom::HookIsr()

	{

	TRACE_FUNCTION("HookIsr");

	//	Kern::Printf("CryptoH4JobRandom::HookIsr iIsrHooked=%d this=%x", iIsrHooked, this);

#ifdef __MARM__

	if(!iIsrHooked)

		{

		TInt r = Interrupt::Bind(EIrqRng, Isr, this);

		if(r != KErrNone) Kern::Fault("CryptoH4JobRandom::HookIsr Bind failed", r);

		r = Interrupt::Enable(EIrqRng);

		if(r != KErrNone) Kern::Fault("CryptoH4JobRandom::HookIsr Enable failed", r);

		iIsrHooked = ETrue;

		}

#endif

	}

void CryptoH4JobRandom::UnHookIsr()

	{

	TRACE_FUNCTION("UnHookIsr");

	//	Kern::Printf("CryptoH4JobRandom::UnHookIsr iIsrHooked=%d this=%x", iIsrHooked, this);

#ifdef __MARM__

	if(iIsrHooked)

		{

		Interrupt::Disable(EIrqRng);

		Interrupt::Unbind(EIrqRng);

		iIsrHooked = EFalse;

		}

#endif

	}

#ifdef __MARM__

void CryptoH4JobRandom::Isr(TAny *aPtr)

	{

	TRACE_FUNCTION("Isr");

	CryptoH4JobRandom *p = static_cast<CryptoH4JobRandom *>(aPtr);

	// Disable RNG interrupt so DFC can run.

	p->DisableIsr();

	// Queue DFC to read the RNG

	p->iRandomDfc.Add();

	}

#endif

/**

  Called when the current h/w opperation is complete

*/

void CryptoH4JobRandom::RandomDfc(TAny* aPtr)

    {

    ((CryptoH4JobRandom*)aPtr)->DoRandomDfc();

    }

void CryptoH4JobRandom::DoRandomDfc()

	{

	TRACE_FUNCTION("DoRandomDfc");

	// Set state to not using hw, if we continue using the h/w we will

	// call EnableIsr which will change the state back to ERunning.

	SetRunning(EFalse);

	//	Kern::Printf("DoRandomDfc");

#ifdef __MARM__

	// Read h/w

	iRandomBuffer[iHw32Index] = TOmap::Register32(KHwBaseRngReg + KHoRng_Out);

#else

	static TUint32 n = 0;

	iRandomBuffer[iHw32Index]= n++;

#endif

	++iHw32Index;

	if(iHw32Index >= sizeof(iRandomBuffer)/sizeof(iRandomBuffer[0]))

		{

		iHw32Index = 0;

		}

	TInt outputAvailable = BytesAvailable();

	TInt space = sizeof(iRandomBuffer) - outputAvailable - 4;

	if((outputAvailable >= iJobSizeInBytes) || (space <= 0))

		{

		// Either have enough data to finish job, or out of buffer

		// space to read more.  We pass available data to the LDD, and

		// declare the slice/job done and return.

		//

		// Pass available data to LDD

		//

		// LDD will call GetFromPddBuffer/BytesReadFromPdd to read the data.

		iLddChanRandom.DataAvailable();

		}

	// Are we done yet?

	if(iJobSizeInBytes <= 0)

		{

		// Tell the scheduler that this slice is done

		iJobScheduler->JobComplete(this, KErrNone);

		return;

		}

	// Re-calculate output available and space

	outputAvailable = BytesAvailable();

	space = sizeof(iRandomBuffer) - outputAvailable - 4;

	if((space != 0) && (iJobSizeInBytes-outputAvailable > 0))

		{

		// We have some space and we need more data

		// Enable RNG interrupt. The interrupt will then queue the

		// "random number ready" DFC when the h/w is ready.

		// (when not on h/w, this immediately queues a DFC)

		EnableIsr();

		}

	else

		{

		// Job stalled - either out of space or already have enough

		// data but LDD has not take it

		Stalled();

		}

	return;

	}

// End of file