240 lines
8.3 KiB
C
240 lines
8.3 KiB
C
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/********************************************************************************
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** Copyright (c) 1998-2000 Microsoft Corporation. All Rights Reserved.
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**
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** Portions Copyright (c) 1998-1999 Intel Corporation
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**
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********************************************************************************/
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#ifndef _ICHWAVE_H_
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#define _ICHWAVE_H_
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#include "shared.h"
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//*****************************************************************************
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// Defines
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//*****************************************************************************
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//
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// The scatter gather can (only) handle 32 entries
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//
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const int MAX_BDL_ENTRIES = 32;
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//
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// Mask for accessing the scatter gather entries with a counter.
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//
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const int BDL_MASK = 31;
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//
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// These are the differnet DMA engine states. The HW can only be in two states
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// (on or off) but there are also 2 transition states.
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// From DMA_ENGINE_RESET a failed start transitions to DMA_ENGINE_NEED_START, a
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// successful start transitions to DMA_ENGINE_ON. From DMA_ENGINE_NEED_START a
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// successful restart transitions to DMA_ENGINE_ON, a pause or stop transitions
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// to DMA_ENGINE_RESET. From DMA_ENGINE_ON a pause or stop transitions to
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// DMA_ENGINE_OFF. From DMA_ENGINE_OFF a start transitions to DMA_ENGINE_ON,
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// a reset would transitions to DMA_ENGINE_RESET.
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//
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const int DMA_ENGINE_OFF = 0;
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const int DMA_ENGINE_ON = 1;
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const int DMA_ENGINE_RESET = 2;
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const int DMA_ENGINE_NEED_START = 3; // DMA_ENGINE_RESET | DMA_ENGINE_ON
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//*****************************************************************************
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// Data Structures and Typedefs
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//*****************************************************************************
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//
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// This is a description of one mapping entry. It contains information
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// about the buffer and a tag which is used for "cancel mappings".
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// For one mapping that is described here, there is an entry in the
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// scatter gather engine.
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//
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typedef struct tagMapData
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{
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ULONG ulTag; //tag, a simple counter.
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PHYSICAL_ADDRESS PhysAddr; //phys. addr. of buffer
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PVOID pVirtAddr; //virt. addr. of buffer
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ULONG ulBufferLength; //buffer length
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} tMapData;
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//
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// Structure to describe the ICH Buffer Descriptor List (BDL).
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// The ICH can handle 32 entries, they are allocated at once in common
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// memory (non-cached memory). To avoid slow-down of CPU, the additional
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// information for handling this structure is stored in tBDList.
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//
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typedef struct tagBDEntry
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{
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DWORD dwPtrToPhyAddress;
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WORD wLength;
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WORD wPolicyBits;
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} tBDEntry;
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//
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// Structure needed to keep track of the BDL tables.
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// This structure is seperated from tBDEntry because we want to
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// have it in cached memory (and not along with tBDEntry in non-
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// cached memory).
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//
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typedef struct tagBDList
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{
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PHYSICAL_ADDRESS PhysAddr; // Physical address of BDList
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volatile tBDEntry *pBDEntry; // Virtual Address of BDList
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tBDEntry *pBDEntryBackup;// needed for rearranging the BDList
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tMapData *pMapData; // mapping list
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tMapData *pMapDataBackup;// needed for rearranging the BDList
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int nHead; // index for the BDL Head
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int nTail; // index for the BDL Tail
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ULONG ulTagCounter; // the tag is a simple counter.
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int nBDEntries; // number of entries.
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} tBDList;
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//*****************************************************************************
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// Classes
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//*****************************************************************************
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/*****************************************************************************
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* CMiniportWaveICHStream
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*****************************************************************************
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* ICH wave miniport stream.
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*/
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class CMiniportWaveICHStream : public IMiniportWavePciStream,
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public IDrmAudioStream,
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public CUnknown
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{
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private:
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//
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// CMiniportWaveICHStream private variables
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//
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CMiniportWaveICH * Wave; // Miniport Object
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ULONG Channel; // channel this stream handles.
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BOOL Capture; // TRUE=Capture,FALSE=Render
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ULONG CurrentRate; // Current Sample Rate
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WORD NumberOfChannels; // Number of channels
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PSERVICEGROUP ServiceGroup; // service group helps with DPCs
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tBDList stBDList; // needed for scatter gather org.
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PPORTWAVEPCISTREAM PortStream; // Port Stream Interface
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PKSDATAFORMAT_WAVEFORMATEX DataFormat; // Data Format
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KSPIN_LOCK MapLock; // for processing mappings.
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ULONG m_ulBDAddr; // Offset of the stream's DMA registers.
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ULONG DMAEngineState; // DMA engine state (STOP, PAUSE, RUN)
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ULONGLONG TotalBytesMapped; // factor in position calculation
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ULONGLONG TotalBytesReleased; // factor in position calculation
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DEVICE_POWER_STATE m_PowerState; // Current power state of the device.
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/*************************************************************************
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* CMiniportWaveICHStream methods
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*************************************************************************
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*
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* These are private member functions used internally by the object. See
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* ICHWAVE.CPP for specific descriptions.
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*/
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//
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// Moves the BDL and associated mappings list around.
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//
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void MoveBDList
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(
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IN int nFirst,
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IN int nLast,
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IN int nNewPos
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);
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//
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// Called when new mappings have to be processed.
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//
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NTSTATUS GetNewMappings (void);
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//
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// Called when we want to release some mappings.
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//
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NTSTATUS ReleaseUsedMappings (void);
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//
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// DMA start/stop/pause/reset routines.
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//
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NTSTATUS ResetDMA (void);
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NTSTATUS PauseDMA (void);
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NTSTATUS ResumeDMA (void);
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public:
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/*************************************************************************
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* The following two macros are from STDUNK.H. DECLARE_STD_UNKNOWN()
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* defines inline IUnknown implementations that use CUnknown's aggregation
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* support. NonDelegatingQueryInterface() is declared, but it cannot be
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* implemented generically. Its definition appears in ICHWAVE.CPP.
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* DEFINE_STD_CONSTRUCTOR() defines inline a constructor which accepts
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* only the outer unknown, which is used for aggregation. The standard
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* create macro (in ICHWAVE.CPP) uses this constructor.
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*/
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DECLARE_STD_UNKNOWN ();
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DEFINE_STD_CONSTRUCTOR (CMiniportWaveICHStream);
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~CMiniportWaveICHStream ();
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/*************************************************************************
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* Include IMiniportWavePciStream (public/exported) methods.
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*************************************************************************
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*/
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IMP_IMiniportWavePciStream;
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/*************************************************************************
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* Include IDrmAudioStream (public/exported) methods.
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*************************************************************************
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*/
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IMP_IDrmAudioStream;
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/*************************************************************************
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* CMiniportWaveICHStream methods
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*************************************************************************
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*/
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//
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// Initializes the Stream object.
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//
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NTSTATUS Init
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(
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IN CMiniportWaveICH *Miniport_,
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IN PPORTWAVEPCISTREAM PortStream,
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IN ULONG Channel,
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IN BOOLEAN Capture,
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IN PKSDATAFORMAT DataFormat,
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OUT PSERVICEGROUP * ServiceGroup
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);
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//
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// This method is called when the device changes power states.
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//
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NTSTATUS PowerChangeNotify
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(
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IN POWER_STATE NewState
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);
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//
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// Return the current sample rate.
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//
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ULONG GetCurrentSampleRate (void)
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{
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return CurrentRate;
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}
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//
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// Friends
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//
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friend
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NTSTATUS CMiniportWaveICH::InterruptServiceRoutine
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(
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IN PINTERRUPTSYNC InterruptSync,
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IN PVOID StaticContext
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);
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};
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#endif
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