TABLE OF CONTENTS<br>1. INTRODUCTION.........................................................................................................1<br>2. TERMS AND ABBREVIATIONS.................................................................................2<br>3. ARCHITECTURAL OVERVIEW..................................................................................6<br>3.1 Introduction..........................................................................................................6<br>3.2 Data Transfer Types............................................................................................7<br>3.3 Host Controller Interface.....................................................................................7<br>3.3.1 Communication Channels............................................................................................7<br>3.3.2 Data Structures...........................................................................................................8<br>3.4 Host Controller Driver Responsibilities...........................................................12<br>3.4.1 Host Controller Management....................................................................................12<br>3.4.2 Bandwidth Allocation................................................................................................12<br>3.4.3 List Management......................................................................................................13<br>3.4.4 Root Hub..................................................................................................................13<br>3.5 Host Controller Responsibilities......................................................................13<br>3.5.1 USB States...............................................................................................................13<br>3.5.2 Frame management...................................................................................................14<br>3.5.3 List Processing..........................................................................................................14<br>4. DATA STRUCTURES...............................................................................................15<br>4.1 Overview.............................................................................................................15<br>4.2 Endpoint Descriptor..........................................................................................16<br>4.2.1 Endpoint Descriptor Format......................................................................................16<br>4.2.2 Endpoint Descriptor Field Definitions........................................................................17<br>4.2.3 Endpoint Descriptor Description...............................................................................18<br>4.3 Transfer Descriptors.........................................................................................19<br>4.3.1 General Transfer Descriptor......................................................................................19<br>4.3.1.1 General Transfer Descriptor Format...................................................................20<br>4.3.1.2 General Transfer Descriptor Field Definitions.....................................................20<br>4.3.1.3 General Transfer Descriptor Description.............................................................21<br>4.3.1.3.1 Buffer Address Determination.....................................................................21<br>4.3.1.3.2 Packet Size..................................................................................................21<br>4.3.1.3.3 Condition Codes..........................................................................................22<br>4.3.1.3.4 Sequence Bits..............................................................................................22<br>4.3.1.3.5 Transfer Completion....................................................................................23<br>4.3.1.3.6 Transfer Errors............................................................................................23<br>4.3.1.3.6.1 Transmission Errors..............................................................................24<br>4.3.1.3.6.2 Sequence Errors...................................................................................24<br>vi<br><br>OpenHCI - Open Host Controller Interface Specification for USB<br>4.3.1.3.6.3 System Errors.......................................................................................25<br>4.3.1.3.7 Special Handling..........................................................................................25<br>4.3.1.3.7.1 NAK.....................................................................................................25<br>4.3.1.3.7.2 Stall......................................................................................................25<br>4.3.2 Isochronous Transfer Descriptor...............................................................................25<br>4.3.2.1 Isochronous Transfer Descriptor Format............................................................25<br>4.3.2.2 Isochronous Transfer Descriptor Field Definitions..............................................26<br>4.3.2.3 Isochronous Transfer Descriptor Description......................................................26<br>4.3.2.3.1 Buffer Addressing........................................................................................27<br>4.3.2.3.2 Data Packet Size.........................................................................................28<br>4.3.2.3.3 Status..........................................................................................................28<br>4.3.2.3.4 Transfer Completion....................................................................................28<br>4.3.2.3.5 Transfer Errors............................................................................................28<br>4.3.2.3.5.1 Transmission Errors..............................................................................29<br>4.3.2.3.5.2 Sequence Errors...................................................................................29<br>4.3.2.3.5.3 Time Errors..........................................................................................29<br>4.3.2.3.5.4 System Errors.......................................................................................30<br>4.3.2.3.6 Special Handling..........................................................................................31<br>4.3.2.3.6.1 NAK and STALL.................................................................................31<br>4.3.2.4 PacketStatusWord..............................................................................................31<br>4.3.2.4.1 Packet Status Word Field Definitions...........................................................31<br>4.3.3 Completion Codes.....................................................................................................32<br>4.3.3.1 Condition Code Description...............................................................................33<br>4.4 Host Controller Communications Area............................................................33<br>4.4.1 Host Controller Communications Area Format..........................................................34<br>4.4.2 Host Controller Communications Area Description...................................................34<br>4.4.2.1 HccaInterruptTable............................................................................................34<br>4.4.2.2 HccaFrameNumber............................................................................................35<br>4.4.2.3 HccaDoneHead..................................................................................................35<br>4.5 Endpoint List Processing.................................................................................36<br>4.6 Transfer Descriptor Queue Processing...........................................................37<br>5. HOST CONTROLLER DRIVER................................................................................38<br>5.1 Host Controller Management............................................................................38<br>5.1.1 Initialization..............................................................................................................38<br>5.1.1.1 Load and Locate................................................................................................39<br>5.1.1.2 Verify Host Controller and Allocate Resources...................................................39<br>5.1.1.3 Take Control of Host Controller.........................................................................40<br>5.1.1.3.1 SMM Driver, Power-Up..............................................................................40<br>5.1.1.3.2 BIOS Driver................................................................................................40<br>5.1.1.3.3 OS Driver, SMM Active..............................................................................41<br>5.1.1.3.4 OS Driver, BIOS Active..............................................................................41<br>5.1.1.3.5 OS Driver, neither SMM nor BIOS.............................................................41<br>5.1.1.3.6 SMM Driver, Re-Entry................................................................................42<br>vii<br><br>OpenHCI - Open Host Controller Interface Specification for USB<br>5.1.1.4 Setup Host Controller........................................................................................42<br>5.1.1.5 Begin Sending SOFs...........................................................................................42<br>5.1.2 Operational States.....................................................................................................43<br>5.1.2.1 USBRESET..........................................................................................................43<br>5.1.2.2 USBOPERATIONAL..............................................................................................43<br>5.1.2.3 USBSUSPEND......................................................................................................43<br>5.1.2.4 USBRESUME.......................................................................................................44<br>5.2 Schedule.............................................................................................................44<br>5.2.1 Sample Host Controller Driver Definitions................................................................46<br>5.2.2 Miscellaneous Definitions..........................................................................................46<br>5.2.3 Host Controller Descriptors Definitions.....................................................................47<br>5.2.4 Host Controller Driver Descriptor Definitions...........................................................48<br>5.2.5 Host Controller Endpoints........................................................................................50<br>5.2.6 Host Controller Driver Internal Definitions................................................................51<br>5.2.7 Endpoint Descriptor Lists.........................................................................................54<br>5.2.7.1 Bulk and Control................................................................................................54<br>5.2.7.1.1 Adding........................................................................................................54<br>5.2.7.1.2 Removing....................................................................................................56<br>5.2.7.1.3 Pause...........................................................................................................59<br>5.2.7.2 Interrupt.............................................................................................................61<br>5.2.7.2.1 Polling Rate.................................................................................................64<br>5.2.7.2.2 Adding........................................................................................................66<br>5.2.7.2.3 Removing....................................................................................................66<br>5.2.7.2.4 Pause...........................................................................................................67<br>5.2.7.3 Isochronous.......................................................................................................67<br>5.2.7.3.1 Adding........................................................................................................68<br>5.2.7.3.2 Removing....................................................................................................68<br>5.2.7.3.3 Pause...........................................................................................................68<br>5.2.8 Transfer Descriptor Queues......................................................................................68<br>5.2.8.1 The NULL or Empty Queue...............................................................................68<br>5.2.8.2 Adding to a Queue.............................................................................................69<br>5.2.8.3 Removing from a Queue.....................................................................................73<br>5.2.8.4 Cancel................................................................................................................74<br>5.2.9 Done Queue..............................................................................................................75<br>5.2.10 USB Bandwidth Allocation.....................................................................................78<br>5.2.10.1 Scheduling Overrun Errors...............................................................................78<br>5.2.11 ControlBulkServiceRatio........................................................................................79<br>5.3 Host Controller Interrupt...................................................................................80<br>5.4 FrameInterval Counter.......................................................................................85<br>5.5 Root Hub............................................................................................................86<br>viii<br><br>OpenHCI - Open Host Controller Interface Specification for USB<br>6. HOST CONTROLLER..............................................................................................87<br>6.1 Introduction........................................................................................................87<br>6.2 USB States.........................................................................................................87<br>6.2.1 UsbOperational.........................................................................................................88<br>6.2.2 UsbReset..................................................................................................................89<br>6.2.3 UsbSuspend..............................................................................................................89<br>6.2.4 UsbResume...............................................................................................................89<br>6.3 Frame Management...........................................................................................90<br>6.3.1 Frame Timing............................................................................................................90<br>6.3.2 StartOfFrame (SOF) Token Generation.....................................................................91<br>6.3.3 HccaFrameNumber Update.......................................................................................91<br>6.4 List Processing..................................................................................................92<br>6.4.1 Priority.....................................................................................................................92<br>6.4.1.1 List Priority........................................................................................................93<br>6.4.1.1.1 Periodic Lists...............................................................................................93<br>6.4.1.1.2 Nonperiodic Lists........................................................................................93<br>6.4.1.2 Endpoint Descriptor Priority..............................................................................94<br>6.4.1.3 Transfer Descriptor Priority................................................................................95<br>6.4.2 List Service Flow......................................................................................................95<br>6.4.2.1 List Enabled Check............................................................................................95<br>6.4.2.2 Locating Endpoint Descriptors...........................................................................97<br>6.4.3 Endpoint Descriptor Processing................................................................................98<br>6.4.4 Transfer Descriptor Processing.................................................................................99<br>6.4.4.1 Isochronous Relative Frame Number Calculation................................................99<br>6.4.4.2 Packet Address and Size Calculation..................................................................99<br>6.4.4.3 Packet Transfer Time Check.............................................................................101<br>6.4.4.4 Largest Data Packet Counter Operation...........................................................102<br>6.4.4.5 Status Writeback..............................................................................................102<br>6.4.4.5.1 General Transfer Descriptor Status Writeback...........................................102<br>6.4.4.5.2 Isochronous Transfer Descriptor Status Writeback....................................103<br>6.4.4.6 Transfer Descriptor Retirement........................................................................103<br>6.4.5 Done Queue............................................................................................................104<br>6.4.5.1 Done Queue Interrupt Counter.........................................................................104<br>6.5 Interrupt Processing........................................................................................105<br>6.5.1 SchedulingOverrun Event........................................................................................105<br>6.5.2 WritebackDoneHead Event.....................................................................................106<br>6.5.3 StartOfFrame Event................................................................................................106<br>6.5.4 ResumeDetected Event...........................................................................................106<br>6.5.5 UnrecoverableError Event......................................................................................106<br>6.5.6 FrameNumberOverflow Event.................................................................................106<br>6.5.7 RootHubStatusChange Event..................................................................................107<br>6.5.8 OwnershipChange Event.........................................................................................107<br>ix<br><br>OpenHCI - Open Host Controller Interface Specification for USB<br>6.6 Root Hub..........................................................................................................107<br>7. OPERATIONAL REGISTERS.................................................................................108<br>7.1 The Control and Status Partition....................................................................109<br>7.1.1 HcRevision Register................................................................................................109<br>7.1.2 HcControl Register.................................................................................................109<br>7.1.3 HcCommandStatus Register....................................................................................112<br>7.1.4 HcInterruptStatus Register......................................................................................113<br>7.1.5 HcInterruptEnable Register....................................................................................115<br>7.1.6 HcInterruptDisable Register...................................................................................116<br>7.2 Memory Pointer Partition................................................................................117<br>7.2.1 HcHCCA Register...................................................................................................117<br>7.2.2 HcPeriodCurrentED Register.................................................................................117<br>7.2.3 HcControlHeadED Register...................................................................................118<br>7.2.4 HcControlCurrentED Register................................................................................118<br>7.2.5 HcBulkHeadED Register........................................................................................119<br>7.2.6 HcBulkCurrentED Register.....................................................................................119<br>7.2.7 HcDoneHead Register............................................................................................120<br>7.3 Frame Counter Partition..................................................................................120<br>7.3.1 HcFmInterval Register............................................................................................120<br>7.3.2 HcFmRemaining Register.......................................................................................121<br>7.3.3 HcFmNumber Register...........................................................................................122<br>7.3.4 HcPeriodicStart Register........................................................................................122<br>7.3.5 HcLSThreshold Register.........................................................................................123<br>7.4 Root Hub Partition...........................................................................................123<br>7.4.1 HcRhDescriptorA Register......................................................................................124<br>7.4.2 HcRhDescriptorB Register......................................................................................125<br>7.4.3 HcRhStatus Register...............................................................................................126<br>7.4.4 HcRhPortStatus[1:NDP] Register...........................................................................128<br>APPENDIX A—PCI INTERFACE................................................................................132<br>PCI CONFIGURATION...............................................................................................132<br>PCI Configuration Spaces for OpenHCI-compliant USB Host Controller.........133<br>COMMAND Register.......................................................................................................134<br>CLASS_CODE Register...................................................................................................134<br>BAR_OHCI Register........................................................................................................135<br>x<br><br>OpenHCI - Open Host Controller Interface Specification for USB<br>APPENDIX B—LEGACY SUPPORT INTERFACE SPECIFICATION........................136<br>OVERVIEW.................................................................................................................136<br>OPERATIONAL THEORY..........................................................................................137<br>Keyboard/Mouse Input..........................................................................................137<br>Keyboard Output...................................................................................................138<br>Emulation Interrupts..............................................................................................138<br>Mixed Environment.........................................................................................................139<br>Gate A20 Sequence.........................................................................................................139<br>SYSTEM REQUIREMENTS........................................................................................140<br>Host Controller Mapping.......................................................................................140<br>SMI Signaling.........................................................................................................141<br>Intercept Port 60h and 64h Accesses..................................................................141<br>Interrupts................................................................................................................141<br>Run-time Memory ..................................................................................................141<br>PROGRAMMING INTERFACE...................................................................................142<br>Modifications to existing registers......................................................................142<br>HcRevision Register........................................................................................................142<br>Legacy Support Registers....................................................................................142<br>HceInput Register............................................................................................................143<br>HceOutput Register.........................................................................................................143<br>HceStatus Register...........................................................................................................144<br>HceControl Register........................................................................................................145<br>IMPLEMENTATION NOTES.......................................................................................146<br>Emulation Interrupt Decode..................................................................................146<br>A20 Gate.................................................................................................................146
剩余159页未读,继续阅读
- zl_Alen2012-11-12谢谢分享,清晰度很高。可惜没有带书签!
- yingkou2013-11-20介绍的很详细,谢谢楼主。
- philip_0012013-09-16英文资料,可以参考
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