xnu-1228.tar.gz

[apple/xnu.git] / iokit / Kernel / IODMAController.cpp

diff --git a/iokit/Kernel/IODMAController.cpp b/iokit/Kernel/IODMAController.cpp
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+++ b/iokit/Kernel/IODMAController.cpp
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+/*
+ * 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