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