iokit/Kernel/IODMAController.cpp

   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 #define IOKIT_ENABLE_SHARED_PTR
  30
  31 #include <IOKit/IODMAController.h>
  32 #include <libkern/c++/OSSharedPtr.h>
  33
  34
  35 #define super IOService
  36 OSDefineMetaClassAndAbstractStructors(IODMAController, IOService);
  37
  38 OSSharedPtr<const OSSymbol>
  39 IODMAController::createControllerName(UInt32 phandle)
  40 {
  41 #define CREATE_BUF_LEN 48
  42         char           buf[CREATE_BUF_LEN];
  43
  44         snprintf(buf, CREATE_BUF_LEN, "IODMAController%08X", (uint32_t)phandle);
  45
  46         return OSSymbol::withCString(buf);
  47 }
  48
  49 IODMAController *
  50 IODMAController::getController(IOService *provider, UInt32 dmaIndex)
  51 {
  52         OSData          *dmaParentData;
  53         OSSharedPtr<const OSSymbol> dmaParentName;
  54         IODMAController *dmaController;
  55
  56         // Find the name of the parent dma controller
  57         OSSharedPtr<OSObject> prop = provider->copyProperty("dma-parent");
  58         dmaParentData = OSDynamicCast(OSData, prop.get());
  59         if (dmaParentData == NULL) {
  60                 return NULL;
  61         }
  62
  63         if (dmaParentData->getLength() == sizeof(UInt32)) {
  64                 dmaParentName = createControllerName(*(UInt32 *)dmaParentData->getBytesNoCopy());
  65         } else {
  66                 if (dmaIndex >= dmaParentData->getLength() / sizeof(UInt32)) {
  67                         panic("dmaIndex out of range");
  68                 }
  69                 dmaParentName = createControllerName(*(UInt32 *)dmaParentData->getBytesNoCopy(dmaIndex * sizeof(UInt32), sizeof(UInt32)));
  70         }
  71         if (dmaParentName == NULL) {
  72                 return NULL;
  73         }
  74
  75         // Wait for the parent dma controller
  76         dmaController = OSDynamicCast(IODMAController, IOService::waitForService( IOService::nameMatching(dmaParentName.get()).detach()));
  77
  78         return dmaController;
  79 }
  80
  81
  82 bool
  83 IODMAController::start(IOService *provider)
  84 {
  85         if (!super::start(provider)) {
  86                 return false;
  87         }
  88
  89         _provider = provider;
  90
  91         return true;
  92 }
  93
  94
  95 // protected
  96
  97 void
  98 IODMAController::registerDMAController(IOOptionBits options)
  99 {
 100         OSData *phandleData;
 101
 102         OSSharedPtr<OSObject> prop = _provider->copyProperty("AAPL,phandle");
 103         phandleData = OSDynamicCast(OSData, prop.get());
 104
 105         _dmaControllerName = createControllerName(*(UInt32 *)phandleData->getBytesNoCopy());
 106
 107         setName(_dmaControllerName.get());
 108
 109         registerService(options | ((options & kIOServiceAsynchronous) ? 0 : kIOServiceSynchronous));
 110 }
 111
 112 void
 113 IODMAController::completeDMACommand(IODMAEventSource *dmaES, IODMACommand *dmaCommand)
 114 {
 115         dmaES->completeDMACommand(dmaCommand);
 116 }
 117
 118 void
 119 IODMAController::notifyDMACommand(IODMAEventSource *dmaES, IODMACommand *dmaCommand, IOReturn status, IOByteCount actualByteCount, AbsoluteTime timeStamp)
 120 {
 121         dmaES->notifyDMACommand(dmaCommand, status, actualByteCount, timeStamp);
 122 }
 123
 124
 125 // private