BSP Developer's Guide

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VxWorks 5.5 BSP Developer’s Guide I.3.2 SCSI Controller Library (scsiCtrlLib) The SCSI controller library is designed for the older generation of SCSI-2 controllers that require the protocol state machine (and transitions) to be handled by a higher level of software.These basic SCSI controller drivers (those that need to use the SCSI state machine provided by the SCSI library) use the SCSI controller library. More advanced SCSI controllers allow such protocol state machines to be implemented at the SCSI controller level. This significantly reduces the number of SCSI interrupts to the CPU per I/O process which improves performance. There is a well defined interface between the SCSI libraries and the controller driver of such drivers, and this interface is defined in I.4 The SCSI Driver Programming Interface, p.325. I.3.3 SCSI Direct Access Library (scsiDirectLib) The SCSI direct access library scsiDirectLib encapsulates all the routines that implement the SCSI direct access commands as defined in the SCSI ANSI Specification I. In addition to all the direct access commands, scsiDirectLib provides the routines that supply the BLK_DEV abstraction for SCSI direct access peripheral devices. I.3.4 SCSI Sequential Access Library (scsiSeqLib) The SCSI sequential access library scsiSeqLib provides all the routines that implement the mandatory SCSI sequential access commands as defined in the SCSI ANSI Specification I. Some optional features are also implemented. Routines that manipulate the SEQ_DEV abstraction are also supplied in this library. I.3.5 SCSI Common Access Library (scsiCommonLib) SCSI commands that are common to all SCSI peripheral device types are provided in the common access library. These commands are described in the SCSI ANSI Specification I. The programming interface to such commands can be found in the relevant reference entries or by looking at the header file scsi2Lib.h. 324
I Writing a SCSI-2 Device Driver I.3.6 An Execution Example Let us take a brief look at what happens when a VxWorks task requests SCSI service by invoking a SCSI library routine such as scsiInquiry( ). Since we are assuming a SCSI-2 configuration, first the scsi2Inquiry( ) routine is invoked which in turn invokes scsiTransact( ) (see Forming SCSI Commands, p.321). scsiTransact( ) invokes scsiCommand( ), the routine that allocates a SCSI thread, executes the thread, and then deletes it. The execution of the thread via scsiThreadExecute( ) causes the SCSI manager to be informed of a new thread to execute, and subsequent blocking of that VxWorks task on a message queue until a response has been received. This is the boundary where a VxWorks task is blocked and the SCSI manager is awakened to start the execution of a new thread as well as management of any other threads that it may be dealing with. After the SCSI thread has executed and has received a response, the calling VxWorks task is unblocked and eventually the SCSI thread associated with that task is deleted. I.4 The SCSI Driver Programming Interface To better explain the interface between the controller driver and the SCSI libraries for the two types of SCSI controllers (basic and advanced), this section discusses each type of driver separately. A skeletal driver is provided along with the programming interface between the SCSI libraries and the controller driver. The controller driver routines provide all the hardware register accesses and controller-specific functionality. For the sake of simplicity, such accesses and controller-specific information have not been shown. It is the purpose of the template drivers to show the overall structure and programming interface between the driver, the SCSI libraries, and the BSP. I I.4.1 Basic SCSI Controller Driver This section presents the basic programming interface SCSI controller and the SCSI libraries. Following that description, this section presents a template you should use when writing your own SCSI controller driver. 325
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VxWorks® 5.5 BSP DEVELOPER’S GUI
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1 Overview ........................
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Contents 1 Overview ...............
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Contents 3.6.5 Cache, MMU, and DMA
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Contents 7.3.3 System Configuration
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Contents F Generic Drivers ........
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1 Overview 1.1 Introduction One str
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1 Overview Included with Tornado (n
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1 Overview Table 1-1 Font Usage for
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2 BSP Organization 2.1 Introduction
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2 BSP Organization Files in the tar
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2 BSP Organization Files in the tar
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2 BSP Organization Version 1.0 BSPs
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2 BSP Organization SM_MEM_SIZE The
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2 BSP Organization For boards witho
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2 BSP Organization The Motorola M68
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3 Creating a New BSP 3.1 Introducti
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3 Creating a New BSP 3.2 Setting Up
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3 Creating a New BSP Makefile At a
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3 Creating a New BSP char * sysBspR
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3 Creating a New BSP 3.6.7 SCSI VxW
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4 Hardware Guidelines 4.1 Introduct
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5 Driver Guidelines 5.1 Introductio
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5 Driver Guidelines Maintenance and
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5 Driver Guidelines word addresses.
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5 Driver Guidelines 5.4 Design Guid
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5 Driver Guidelines 5.8 Driver Use
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6 Components 6.1 Introduction Torna
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6 Components 6.2 Component Descript
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6 Components ■ User Presentation.
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6 Components Folder FOLDER_ANSI { N
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6 Components in a single project. I
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6 Components The component object i
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7 Validation Testing 7.1 Introducti
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8 Writing Portable C Code This chap
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9 Documentation Guidelines 9.1 Intr
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9 Documentation Guidelines INCLUDE
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10 Product Packaging 10.1 SETUP Dev
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A Upgrading a BSP for Tornado 2.0 T
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B Upgrading a BSP for Tornado 2.2 T
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C Upgrading a BSP for the VxWorks N
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D VxWorks Boot Sequence Table D-1 d
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E Component Language E.1 Component
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E Component Language REQUIRES r1 r2
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F Generic Drivers F.1 Introduction
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F Generic Drivers CONSOLE_TTY This
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F Generic Drivers Define SIO_CALLBA
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G Upgrading 4.3 BSD Network Drivers
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H Implementing a MUX-Based Network
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K BSP Validation Checklists 7. Veri
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K BSP Validation Checklists 2. If t
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K BSP Validation Checklists Validat
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K BSP Validation Checklists Manufac
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L Refgen NOTE: In Tornado 1.0.1 and
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L Refgen * SYNOPSIS * \cs * void xx
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L Refgen Yields output approximatel
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L Refgen EXAMPLE INCLUDES SEE ALSO
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M BSP Product Contents When you are
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Index A abort button 82 addressing
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Index clocks see also individual cl
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Index naming conventions 95 perform
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Index INCLUDE_USR_APPL 38 INCLUDE_V
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Index network drivers 58 network in
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Index scsiCtrlLib 324 scsiDirectLib
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Index testing, validation 139-158 s
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