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