iokit/Kernel/IOInterruptEventSource.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,
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  23  * Please see the License for the specific language governing rights and
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  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29 Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
  30
  31 HISTORY
  32     1998-7-13   Godfrey van der Linden(gvdl)
  33         Created.
  34 */
  35 #include <IOKit/IOInterruptEventSource.h>
  36 #include <IOKit/IOLib.h>
  37 #include <IOKit/IOService.h>
  38 #include <IOKit/IOInterrupts.h>
  39 #include <IOKit/IOTimeStamp.h>
  40 #include <IOKit/IOWorkLoop.h>
  41
  42 #if KDEBUG
  43
  44 #define IOTimeTypeStampS(t)                                             \
  45 do {                                                                    \
  46     IOTimeStampStart(IODBG_INTES(t),                                    \
  47                      (unsigned int) this, (unsigned int) owner);        \
  48 } while(0)
  49
  50 #define IOTimeTypeStampE(t)                                             \
  51 do {                                                                    \
  52     IOTimeStampEnd(IODBG_INTES(t),                                      \
  53                    (unsigned int) this, (unsigned int) owner);          \
  54 } while(0)
  55
  56 #define IOTimeStampLatency()                                            \
  57 do {                                                                    \
  58     IOTimeStampEnd(IODBG_INTES(IOINTES_LAT),                            \
  59                    (unsigned int) this, (unsigned int) owner);          \
  60 } while(0)
  61
  62 #else /* !KDEBUG */
  63 #define IOTimeTypeStampS(t)
  64 #define IOTimeTypeStampE(t)
  65 #define IOTimeStampLatency()
  66 #endif /* KDEBUG */
  67
  68 #define super IOEventSource
  69
  70 OSDefineMetaClassAndStructors(IOInterruptEventSource, IOEventSource)
  71 OSMetaClassDefineReservedUnused(IOInterruptEventSource, 0);
  72 OSMetaClassDefineReservedUnused(IOInterruptEventSource, 1);
  73 OSMetaClassDefineReservedUnused(IOInterruptEventSource, 2);
  74 OSMetaClassDefineReservedUnused(IOInterruptEventSource, 3);
  75 OSMetaClassDefineReservedUnused(IOInterruptEventSource, 4);
  76 OSMetaClassDefineReservedUnused(IOInterruptEventSource, 5);
  77 OSMetaClassDefineReservedUnused(IOInterruptEventSource, 6);
  78 OSMetaClassDefineReservedUnused(IOInterruptEventSource, 7);
  79
  80 bool IOInterruptEventSource::init(OSObject *inOwner,
  81                                   Action inAction,
  82                                   IOService *inProvider,
  83                                   int inIntIndex)
  84 {
  85     bool res = true;
  86
  87     if ( !super::init(inOwner, (IOEventSourceAction) inAction) )
  88         return false;
  89
  90     provider = inProvider;
  91     producerCount = consumerCount = 0;
  92     autoDisable = explicitDisable = false;
  93     intIndex = -1;
  94
  95     // Assumes inOwner holds a reference(retain) on the provider
  96     if (inProvider) {
  97         int intType;
  98
  99         res = (kIOReturnSuccess
 100                     == inProvider->getInterruptType(inIntIndex, &intType));
 101         if (res) {
 102             IOInterruptAction intHandler;
 103
 104             autoDisable = (intType == kIOInterruptTypeLevel);
 105             if (autoDisable) {
 106                 intHandler = OSMemberFunctionCast(IOInterruptAction,
 107                     this, &IOInterruptEventSource::disableInterruptOccurred);
 108             }
 109             else
 110                 intHandler = OSMemberFunctionCast(IOInterruptAction,
 111                     this, &IOInterruptEventSource::normalInterruptOccurred);
 112
 113             res = (kIOReturnSuccess == inProvider->registerInterrupt
 114                                         (inIntIndex, this, intHandler));
 115             if (res)
 116                 intIndex = inIntIndex;
 117         }
 118     }
 119
 120     return res;
 121 }
 122
 123 IOInterruptEventSource *
 124 IOInterruptEventSource::interruptEventSource(OSObject *inOwner,
 125                                              Action inAction,
 126                                              IOService *inProvider,
 127                                              int inIntIndex)
 128 {
 129     IOInterruptEventSource *me = new IOInterruptEventSource;
 130
 131     if (me && !me->init(inOwner, inAction, inProvider, inIntIndex)) {
 132         me->release();
 133         return 0;
 134     }
 135
 136     return me;
 137 }
 138
 139 void IOInterruptEventSource::free()
 140 {
 141     if (provider && intIndex != -1)
 142         provider->unregisterInterrupt(intIndex);
 143
 144     super::free();
 145 }
 146
 147 void IOInterruptEventSource::enable()
 148 {
 149     if (provider && intIndex != -1) {
 150         provider->enableInterrupt(intIndex);
 151         explicitDisable = false;
 152         enabled = true;
 153     }
 154 }
 155
 156 void IOInterruptEventSource::disable()
 157 {
 158     if (provider && intIndex != -1) {
 159         provider->disableInterrupt(intIndex);
 160         explicitDisable = true;
 161         enabled = false;
 162     }
 163 }
 164
 165 const IOService *IOInterruptEventSource::getProvider() const
 166 {
 167     return provider;
 168 }
 169
 170 int IOInterruptEventSource::getIntIndex() const
 171 {
 172     return intIndex;
 173 }
 174
 175 bool IOInterruptEventSource::getAutoDisable() const
 176 {
 177     return autoDisable;
 178 }
 179
 180 bool IOInterruptEventSource::checkForWork()
 181 {
 182     unsigned int cacheProdCount = producerCount;
 183     int numInts = cacheProdCount - consumerCount;
 184     IOInterruptEventAction intAction = (IOInterruptEventAction) action;
 185
 186     if (numInts > 0) {
 187
 188         IOTimeStampLatency();
 189         IOTimeTypeStampS(IOINTES_CLIENT);
 190             IOTimeStampConstant(IODBG_INTES(IOINTES_ACTION),
 191                                 (unsigned int) intAction, (unsigned int) owner);
 192             (*intAction)(owner, this,  numInts);
 193         IOTimeTypeStampE(IOINTES_CLIENT);
 194
 195         consumerCount = cacheProdCount;
 196         if (autoDisable && !explicitDisable)
 197             enable();
 198     }
 199     else if (numInts < 0) {
 200         IOTimeStampLatency();
 201         IOTimeTypeStampS(IOINTES_CLIENT);
 202             IOTimeStampConstant(IODBG_INTES(IOINTES_ACTION),
 203                                 (unsigned int) intAction, (unsigned int) owner);
 204              (*intAction)(owner, this, -numInts);
 205         IOTimeTypeStampE(IOINTES_CLIENT);
 206
 207         consumerCount = cacheProdCount;
 208         if (autoDisable && !explicitDisable)
 209             enable();
 210     }
 211
 212     return false;
 213 }
 214
 215 void IOInterruptEventSource::normalInterruptOccurred
 216     (void */*refcon*/, IOService */*prov*/, int /*source*/)
 217 {
 218 IOTimeTypeStampS(IOINTES_INTCTXT);
 219 IOTimeStampLatency();
 220
 221     producerCount++;
 222
 223 IOTimeTypeStampS(IOINTES_SEMA);
 224     signalWorkAvailable();
 225 IOTimeTypeStampE(IOINTES_SEMA);
 226
 227 IOTimeTypeStampE(IOINTES_INTCTXT);
 228 }
 229
 230 void IOInterruptEventSource::disableInterruptOccurred
 231     (void */*refcon*/, IOService *prov, int source)
 232 {
 233 IOTimeTypeStampS(IOINTES_INTCTXT);
 234 IOTimeStampLatency();
 235
 236     prov->disableInterrupt(source);     /* disable the interrupt */
 237
 238     producerCount++;
 239
 240 IOTimeTypeStampS(IOINTES_SEMA);
 241     signalWorkAvailable();
 242 IOTimeTypeStampE(IOINTES_SEMA);
 243
 244 IOTimeTypeStampE(IOINTES_INTCTXT);
 245 }
 246
 247 void IOInterruptEventSource::interruptOccurred
 248     (void *refcon, IOService *prov, int source)
 249 {
 250     if (autoDisable && prov)
 251         disableInterruptOccurred(refcon, prov, source);
 252     else
 253         normalInterruptOccurred(refcon, prov, source);
 254 }