xnu-1228.tar.gz

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

diff --git a/iokit/Kernel/IODMAEventSource.cpp b/iokit/Kernel/IODMAEventSource.cpp
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+++ b/iokit/Kernel/IODMAEventSource.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/IODMAEventSource.h>
+#include <IOKit/IOService.h>
+
+#include "IOKitKernelInternal.h"
+
+
+#define super IOEventSource
+OSDefineMetaClassAndStructors(IODMAEventSource, IOEventSource);
+
+bool IODMAEventSource::init(OSObject *inOwner,
+                           IOService *inProvider,
+                           Action inCompletion,
+                           Action inNotification,
+                           UInt32 inDMAIndex)
+{
+  IOReturn result;
+  
+  if (!super::init(inOwner)) return false;
+  
+  if (inProvider == 0) return false;
+  
+  dmaProvider = inProvider;
+  dmaIndex = 0xFFFFFFFF;
+  dmaCompletionAction = inCompletion;
+  dmaNotificationAction = inNotification;
+  
+  dmaController = IODMAController::getController(dmaProvider, inDMAIndex);
+  if (dmaController == 0) return false;
+  dmaController->retain();
+  
+  result = dmaController->initDMAChannel(dmaProvider, this, &dmaIndex, inDMAIndex);
+  if (result != kIOReturnSuccess) return false;
+  
+  queue_init(&dmaCommandsCompleted);
+  dmaCommandsCompletedLock = IOSimpleLockAlloc();
+  
+  return true;
+}
+
+IODMAEventSource *IODMAEventSource::dmaEventSource(OSObject *inOwner,
+                                                  IOService *inProvider,
+                                                  Action inCompletion,
+                                                  Action inNotification,
+                                                  UInt32 inDMAIndex)
+{
+  IODMAEventSource *dmaES = new IODMAEventSource;
+  
+  if (dmaES && !dmaES->init(inOwner, inProvider, inCompletion, inNotification, inDMAIndex)) {
+    dmaES->release();
+    return 0;
+  }
+  
+  return dmaES;
+}
+
+IOReturn IODMAEventSource::startDMACommand(IODMACommand *dmaCommand, IODirection direction, IOByteCount byteCount, IOByteCount byteOffset)
+{
+  IOReturn result;
+  
+  if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
+  
+  if (dmaSynchBusy) return kIOReturnBusy;
+  
+  if (dmaCompletionAction == 0) dmaSynchBusy = true;
+  
+  result = dmaController->startDMACommand(dmaIndex, dmaCommand, direction, byteCount, byteOffset);
+  
+  if (result != kIOReturnSuccess) {
+    dmaSynchBusy = false;
+    return result;
+  }
+  
+  while (dmaSynchBusy) sleepGate(&dmaSynchBusy, THREAD_UNINT);
+  
+  return kIOReturnSuccess;
+}
+
+IOReturn IODMAEventSource::stopDMACommand(bool flush, mach_timespec_t *timeout)
+{
+  if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
+  
+  return dmaController->stopDMACommand(dmaIndex, flush, timeout);
+}
+
+
+IOReturn IODMAEventSource::queryDMACommand(IODMACommand **dmaCommand, IOByteCount *transferCount, bool waitForIdle)
+{
+  if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
+  
+  return dmaController->queryDMACommand(dmaIndex, dmaCommand, transferCount, waitForIdle);
+}
+
+
+// protected
+
+bool IODMAEventSource::checkForWork(void)
+{
+  IODMACommand     *dmaCommand = NULL;
+  bool work, again;
+  
+  IOSimpleLockLock(dmaCommandsCompletedLock);
+  work = !queue_empty(&dmaCommandsCompleted);
+  if (work) {
+    queue_remove_first(&dmaCommandsCompleted, dmaCommand, IODMACommand *, fCommandChain);
+    again = !queue_empty(&dmaCommandsCompleted);
+  } else {
+    again = false;
+  }
+  IOSimpleLockUnlock(dmaCommandsCompletedLock);
+
+  if (work) {
+    (*dmaCompletionAction)(owner, this, dmaCommand, dmaCommand->reserved->fStatus, dmaCommand->reserved->fActualByteCount);
+  }
+  
+  return again;
+}
+
+void IODMAEventSource::completeDMACommand(IODMACommand *dmaCommand)
+{
+  if (dmaCompletionAction != 0) {
+    IOSimpleLockLock(dmaCommandsCompletedLock);
+    queue_enter(&dmaCommandsCompleted, dmaCommand, IODMACommand *, fCommandChain);
+    IOSimpleLockUnlock(dmaCommandsCompletedLock);
+    
+    signalWorkAvailable();
+  } else {
+    dmaSynchBusy = false;
+    wakeupGate(&dmaSynchBusy, true);
+  }
+}
+
+void IODMAEventSource::notifyDMACommand(IODMACommand *dmaCommand, IOReturn status, IOByteCount actualByteCount)
+{
+  dmaCommand->reserved->fStatus = status;
+  dmaCommand->reserved->fActualByteCount = actualByteCount;  
+  
+  if (dmaNotificationAction != 0) (*dmaNotificationAction)(owner, this, dmaCommand, status, actualByteCount);
+}