iokit/IOKit/IODMAController.h

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
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  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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  23  * Please see the License for the specific language governing rights and
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  27  */
  28
  29 #ifndef _IOKIT_IODMACONTROLLER_H
  30 #define _IOKIT_IODMACONTROLLER_H
  31
  32 #include <IOKit/IODMACommand.h>
  33 #include <IOKit/IODMAEventSource.h>
  34 #include <IOKit/IOService.h>
  35
  36 class IODMAEventSource;
  37
  38 class IODMAController : public IOService
  39 {
  40   OSDeclareAbstractStructors(IODMAController);
  41
  42   friend class IODMAEventSource;
  43
  44  private:
  45   IOService       *_provider;
  46   const OSSymbol  *_dmaControllerName;
  47
  48  protected:
  49   virtual void registerDMAController(IOOptionBits options = 0);
  50   virtual IOReturn initDMAChannel(IOService *provider, IODMAEventSource *dmaES, UInt32 *dmaIndex, UInt32 reqIndex) = 0;
  51   virtual IOReturn startDMACommand(UInt32 dmaIndex, IODMACommand *dmaCommand, IODirection direction,
  52                                    IOByteCount byteCount = 0, IOByteCount byteOffset = 0) = 0;
  53   virtual IOReturn stopDMACommand(UInt32 dmaIndex, bool flush = false, uint64_t timeout = UINT64_MAX) = 0;
  54   virtual void completeDMACommand(IODMAEventSource *dmaES, IODMACommand *dmaCommand);
  55   virtual void notifyDMACommand(IODMAEventSource *dmaES, IODMACommand *dmaCommand, IOReturn status, IOByteCount actualByteCount);
  56   virtual IOReturn queryDMACommand(UInt32 dmaIndex, IODMACommand **dmaCommand, IOByteCount *transferCount, bool waitForIdle = false) = 0;
  57   virtual IOByteCount getFIFODepth(UInt32 dmaIndex) = 0;
  58
  59  public:
  60   static const OSSymbol *createControllerName(UInt32 phandle);
  61   static IODMAController *getController(IOService *provider, UInt32 dmaIndex);
  62
  63   virtual bool start(IOService *provider);
  64 };
  65
  66
  67 #endif /* _IOKIT_IODMACONTROLLER_H */