FreeBSD/Linux Kernel Cross Reference
sys/iokit/Kernel/IODMAController.cpp

     /*
      * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
      * Version 2.0 (the 'License'). You may not use this file except in
      * compliance with the License. The rights granted to you under the License
     * may not be used to create, or enable the creation or redistribution of,
     * unlawful or unlicensed copies of an Apple operating system, or to
     * circumvent, violate, or enable the circumvention or violation of, any
     * terms of an Apple operating system software license agreement.
     * 
     * Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
     */
    
    #include <IOKit/IODMAController.h>
    
    
    #define super IOService
    OSDefineMetaClassAndAbstractStructors(IODMAController, IOService);
    
    const OSSymbol *IODMAController::createControllerName(UInt32 phandle)
    {
    #define CREATE_BUF_LEN 48
      char           buf[CREATE_BUF_LEN];
      
      snprintf(buf, CREATE_BUF_LEN, "IODMAController%08lX", phandle);
      
      return OSSymbol::withCString(buf);
    }
    
    IODMAController *IODMAController::getController(IOService *provider, UInt32 dmaIndex)
    {
      OSData          *dmaParentData;
      const OSSymbol  *dmaParentName;
      IODMAController *dmaController;
      
      // Find the name of the parent dma controller
      dmaParentData = OSDynamicCast(OSData, provider->getProperty("dma-parent"));
      if (dmaParentData == 0) return false;
      dmaParentName = createControllerName(*(UInt32 *)dmaParentData->getBytesNoCopy());
      if (dmaParentName == 0) return false;
      
      // Wait for the parent dma controller
      dmaController = OSDynamicCast(IODMAController, IOService::waitForService(IOService::nameMatching(dmaParentName)));
      
      return dmaController;
    }
    
    
    bool IODMAController::start(IOService *provider)
    {
      if (!super::start(provider)) return false;
      
      _provider = provider;
      
      return true;
    }
    
    
    // protected
    
    void IODMAController::registerDMAController(IOOptionBits options)
    {
      OSData *phandleData;
      
      phandleData = OSDynamicCast(OSData, _provider->getProperty("AAPL,phandle"));
      
      _dmaControllerName = createControllerName(*(UInt32 *)phandleData->getBytesNoCopy());
      
      setName(_dmaControllerName);
      
      registerService(options | ((options & kIOServiceAsynchronous) ? 0 : kIOServiceSynchronous));
    }
    
    void IODMAController::completeDMACommand(IODMAEventSource *dmaES, IODMACommand *dmaCommand)
    {
      dmaES->completeDMACommand(dmaCommand);
    }
    
    void IODMAController::notifyDMACommand(IODMAEventSource *dmaES, IODMACommand *dmaCommand, IOReturn status, IOByteCount actualByteCount)
    {
      dmaES->notifyDMACommand(dmaCommand, status, actualByteCount);
    }
    
    
   // private

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