// Copyright (c) 2006-2010 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "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:

//

#ifndef VIRTUALVIDEOHWINTERFACE_H

#define VIRTUALVIDEOHWINTERFACE_H

#include <kernel/kernel.h>

#include <graphics/guestvideodriverinterfaceconstants.h>

/**

 * Class that encapsulates the Virtual Video Hw interface behind a function

 * interface. Intended to be instantiated only once in the device driver.

 */

class DVirtualVideoHwInterface : public DBase

    {

    public: // Data types

        /**

         * Enumeration for different interrupts.

         */

        enum TInterrupt

            {

            EInterruptNewDataAvailable  = 0x01 ///< Video HW has new data available

            };

        /**

         * Enumeration for different registers.

         */

        enum TRegister

            {

            ERegId,                             ///< Id register

            ERegIrqEnable,                      ///< IRQ enabling register

            ERegIrqStatus,                      ///< IRQ status register

            ERegCommand,                        ///< Command register

            ERegParameterLoad,

            ERegError,                         ///< 

            ERegInputBufferTail,

            ERegInputBufferHead,

            ERegInputBufferReadCount,

            ERegInputBufferWriteCount,

            ERegInputBufferMaxTail,

            ERegRequestId,

            ENumRegisters                       ///< Number of registers                                                

            };

    public: // Construction and destruction

        /**

         * Constructor.

         */

        DVirtualVideoHwInterface();

        /**

         * Destructor.

         * NOTE: Enters and leaves critical section.

         */

        virtual ~DVirtualVideoHwInterface();

    public: // Functions

        /**

         * Initializes the Virtual Video HW's memory mapped I/O model.

         * NOTE: Enters and leaves critical section.

         *

         * @return System-wide error code

         */

        TInt InitParametersInputMemory();

        TInt InitParametersOutputMemory();

        /**

         * Enables interrupts in the Virtual Video HW.

         *

         * @param aChannel The channel, whose interrupts are enabled

         * @param aInterruptBitField A bitmask of TInterrupt enumeration.

         *      Enabled interrupt bits should be set to 1 and disabled interrupt

         *      bits to 0.

         */

        void EnableInterrupts( TUint32 aInterruptBitField );

        /**

         * Initializes the Virtual Video HW's memory mapped I/O model.

         * NOTE: Enters and leaves critical section.

         *

         * @return System-wide error code

         */

         TInt InitRegisterMemory();

        /**

         * Retrieves interrupt enabled state in the Virtual Video HW.

         *

         * @param aChannel The channel, whose interrupt states are queried

         * @param aInterruptBitField A reference parameter, where a bitmask of

         *      TInterrupt enumeration will be written. Enabled interrupt bits

         *      are set to 1 and disabled interrupt bits to 0.

         */

        void GetInterruptEnabledState( TUint32& aInterruptBitField );

        /**

         * Retrieves interrupt status in the Virtual Video HW.

         *

         * @param aChannel The channel, whose interrupt status is queried

         * @param aInterruptBitField A reference parameter, where a bitmask of

         *      TInterrupt enumeration will be written. Those interrupt lines

         *      are active, whose bits are set to 1 in the bitmask.

         */

        void GetInterruptStatus( TUint32& aInterruptBitField );

        /**

         * Resets interrupt status in the Virtual Video HW.

         *

         * @param aChannel The channel, whose interrupt statuses are being reset

         * @param aInterruptBitField The bitmask of TInterrupt enumeration. Those

         *      interrupts are reset, whose bits are set to 1 in the bitfield.

         */

        void ResetInterruptStatus( TUint32 aInterruptBitField );

        /**

         * Issues a command to the Virtual Video HW.

         *

         * @param aCommand One of TCommand enumeration commands.

         */

        void IssueCommand( TUint32 aCommand );

        /**

         * Address to input parameter buffer

         */

        TLinAddr InputParametersAddress(){ return iInputParametersChunkKernelAddress; }

        /**

         * Address to output parameter buffer

         */

        TLinAddr OutputParametersAddress(){ return iOutputParametersChunkKernelAddress; }

        /**

         * Gets a register value.

         * 

         * @param aRegisterRange The register range

         * @param aRegister The register in the given register range, whose value is being read

         * @param aValue A reference parameter, where the register's value is written

         */

        void GetRegisterValue(

            TRegister aRegister,

            TUint32& aValue );

        /**

         * Sets a register value.

         * 

         * @param aRegisterRange The register range

         * @param aRegister The register in the given register range, whose value is being written

         * @param aValue A new value to be written into register

         */

        void SetRegisterValue( TRegister aRegister,

            TUint32 aValue );

public:

		IMPORT_C static TPhysAddr GetFrameBase();

    protected:

        /**

         * Maps a virtual address range to physical address space

         * 

         * @param aPhysicalAddress 

         * @param aMaxSize 

         * @param aChunk

         * @param aLinAddr 

         * @return System wide error code

         */

        TInt InitPhysicalMemory( TUint32 aPhysicalAddress, 

                TInt aMaxSize, DChunk*& aChunk, TLinAddr& aLinAddr );

    private: // Data

        /// A memory chunk that is mapped to the Virtual Video HW's physical memory area

        DChunk* iRegisterMemoryChunk;        

        /// The virtual start address of the Virtual Video HW's memory map

        TLinAddr iRegisterChunkKernelAddress;

        /// A memory chunk that is mapped to the Virtual Video HW's physical memory area

        DChunk* iInputParametersMemoryChunk;        

        /// The virtual start address of the Virtual Video HW's memory map

        TLinAddr iInputParametersChunkKernelAddress;

        /// A memory chunk that is mapped to the Virtual Video HW's physical memory area

        DChunk* iOutputParametersMemoryChunk;        

        /// The virtual start address of the Virtual Video HW's memory map

        TLinAddr iOutputParametersChunkKernelAddress;

    };

#endif // VIRTUALVIDEOHWINTERFACE_H