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
  12  * circumvent, violate, or enable the circumvention or violation of, any
  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,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  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, AbsoluteTime timeStamp);
  56         virtual IOReturn queryDMACommand(UInt32 dmaIndex, IODMACommand **dmaCommand, IOByteCount *transferCount, bool waitForIdle = false) = 0;
  57         virtual IOByteCount getFIFODepth(UInt32 dmaIndex, IODirection direction) = 0;
  58         virtual IOReturn setFIFODepth(UInt32 dmaIndex, IOByteCount depth) = 0;
  59         virtual IOByteCount validFIFODepth(UInt32 dmaIndex, IOByteCount depth, IODirection direction) = 0;
  60         virtual IOReturn setFrameSize(UInt32 dmaIndex, UInt8 byteCount) = 0;
  61         virtual IOReturn setDMAConfig(UInt32 dmaIndex, IOService *provider, UInt32 reqIndex) = 0;
  62         virtual bool validDMAConfig(UInt32 dmaIndex, IOService *provider, UInt32 reqIndex) = 0;
  63
  64 public:
  65         static const OSSymbol *createControllerName(UInt32 phandle);
  66         static IODMAController *getController(IOService *provider, UInt32 dmaIndex);
  67
  68         virtual bool start(IOService *provider) APPLE_KEXT_OVERRIDE;
  69 };
  70
  71
  72 #endif /* _IOKIT_IODMACONTROLLER_H */