iokit/IOKit/IODMAEventSource.h

   1 /*
   2  * Copyright (c) 2005 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_IODMAEVENTSOURCE_H
  30 #define _IOKIT_IODMAEVENTSOURCE_H
  31
  32 #include <IOKit/IOService.h>
  33 #include <IOKit/IODMACommand.h>
  34 #include <IOKit/IODMAController.h>
  35 #include <IOKit/IOEventSource.h>
  36
  37 class IODMAController;
  38
  39 class IODMAEventSource : public IOEventSource
  40 {
  41   OSDeclareDefaultStructors(IODMAEventSource);
  42
  43   friend class IODMAController;
  44
  45  public:
  46   typedef void (*Action)(OSObject *owner, IODMAEventSource *dmaES, IODMACommand *dmaCommand, IOReturn status, IOByteCount actualByteCount);
  47 #define IODMAEventAction IODMAEventSource::Action
  48
  49  protected:
  50   virtual void completeDMACommand(IODMACommand *dmaCommand);
  51   virtual void notifyDMACommand(IODMACommand *dmaCommand, IOReturn status, IOByteCount actualByteCount);
  52
  53  public:
  54   static IODMAEventSource *dmaEventSource(OSObject *owner,
  55                                           IOService *provider,
  56                                           Action completion = 0,
  57                                           Action notification = 0,
  58                                           UInt32 dmaIndex = 0);
  59
  60   virtual IOReturn startDMACommand(IODMACommand *dmaCommand, IODirection direction, IOByteCount byteCount = 0, IOByteCount byteOffset = 0);
  61   virtual IOReturn stopDMACommand(bool flush = false, mach_timespec_t *timeout = 0);
  62
  63   virtual IOReturn queryDMACommand(IODMACommand **dmaCommand, IOByteCount *transferCount, bool waitForIdle = false);
  64
  65  private:
  66   IOService       *dmaProvider;
  67   IODMAController *dmaController;
  68   UInt32          dmaIndex;
  69   queue_head_t    dmaCommandsCompleted;
  70   IOSimpleLock    *dmaCommandsCompletedLock;
  71   Action          dmaCompletionAction;
  72   Action          dmaNotificationAction;
  73   bool            dmaSynchBusy;
  74
  75   virtual bool init(OSObject *owner,
  76                     IOService *provider,
  77                     Action completion = 0,
  78                     Action notification = 0,
  79                     UInt32 dmaIndex = 0);
  80   virtual bool checkForWork(void);
  81 };
  82
  83 #endif /* _IOKIT_IODMAEVENTSOURCE_H */