Texas Instruments TMS320C6000 DSP Leitfaden

TMS320C6000NetworkDeveloper'sKit

(NDK) Support Package Ethernet

Driver Design Guide

Literature Number: SPRUFP2

January 2009

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iii

This is a draft version printed from file: pref.fm on 1/5/09

Preface

About This Guide

This document describes the design of the Ethernet driver architecture

introduced in NDK 2.0. This design differs from that in previous versions

of NDK. All Ethernet drivers packaged as a part of the Network

Developer's Kit (NDK) Support Package in NDK 2.0 follow the generic

architecture described in this document.

Important Note:

❏This document covers only the Ethernet driver architecture. The

serial driver is no longer supported as of NDK 2.0. For serial driver

information, see documentation from earlier releases of the NDK.

❏The setup and installation steps for each NDK Support Package

(NSP) are provided in the Release Notes provided with that NSP.

Intended Audience

This document is intended for writers of Ethernet mini-drivers. This

document assumes you have knowledge of Ethernet concepts.

Related Documents The following books describe the TMS320C6x devices and related

support tools. To obtain a copy of any of these TI documents, call the

Texas Instruments Literature Response Center at (800) 477-8924. When

ordering, please identify the book by its title and literature number. Many

of these documents can be found on the Internet at http://www.ti.com.

❏SPRU189 - TMS320C6000 CPU and Instruction Set Reference

Guide. Describes the CPU architecture, pipeline, instruction set, and

interrupts for the TMS320C6000 DSPs.

❏SPRU190 - TMS320C6000 DSP Peripherals Overview Reference

Guide. Provides an overview and briefly describes peripherals

available on the TMS320C6000 family of DSPs.

❏SPRU197 - TMS320C6000 Technical Brief. Provides an introduction

to the TMS320C62x and TMS320C67x digital signal processors

(DSPs) of the TMS320C6000 DSP family. Describes the CPU

architecture, peripherals, development tools, and third-party support

for the C62x and C67x DSPs.

Notational Conventions

❏SPRU198 - TMS320C6000 Programmer's Guide. Reference for

programming the TMS320C6000 digital signal processors (DSPs).

Before you use this manual, you should install your code generation

and debugging tools. Includes a brief description of the C6000 DSP

architecture and code development flow, includes C code examples

and discusses optimization methods for the C code, describes the

structure of assembly code and includes examples and discusses

optimizations for the assembly code, and describes programming

considerations for the C64x DSP.

❏SPRU509 - Code Composer Studio Development Tools v3.3 Getting

Started Guide introduces some of the basic features and

functionalities in Code Composer Studio to enable you to create and

build simple projects.

❏SPRU523 - TMS320C6000 Network Developer's Kit (NDK) Software

User's Guide. Describes how to use the NDK libraries, how to

develop networking applications on TMS320C6000 platforms, and

ways to tune the NDK to fit a particular software environment.

❏SPRU524 - TMS320C6000 Network Developer's Kit (NDK) Software

Programmer's Reference Guide. Describes the various API functions

provided by the stack libraries, including the low level hardware APIs.

Notational Conventions

This document uses the following conventions:

❏Program listings, program examples, and interactive displays are

shown in a mono-spaced font. Examples use bold for emphasis,

and interactive displays use bold to distinguish commands that you

enter from items that the system displays (such as prompts,

command output, error messages, etc.).

❏Square brackets ( [ and ] ) identify an optional parameter. If you use

an optional parameter, you specify the information within the

brackets. Unless the square brackets are in a bold typeface, do not

enter the brackets themselves.

Trademarks The Texas Instruments logo and Texas Instruments are registered

trademarks of Texas Instruments. Trademarks of Texas Instruments

include: TI, Code Composer, Code Composer Studio, DSP/BIOS,

TMS320, TMS320C6000, TMS320C64x, TMS320DM644x, and

TMS320C64x+.

All other brand, product names, and service names are trademarks or

registered trademarks of their respective companies or organizations.

January 5, 2009

This is a draft version printed from file: ndk_spTOC.fm on 1/5/09

Contents

1 Architecture Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

This chapter provides an overview of the terminology and components involved in the Network De-

veloper's Kit Support Package (NSP) Ethernet driver. It also describes the architecture of such

drivers.

1.1 Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.2 Ethernet Driver Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

1.2.1 NIMU-Specific Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

1.2.2 Ethernet Mini-Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

1.2.3 Generic EMAC/MDIO Chip Support Library. . . . . . . . . . . . . . . . . . . . . . . . . .1-5

1.3 Flow Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6

1.4 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

1.4.1 Network Control (NETCTRL) Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

1.4.2 Stack Event (STKEVENT) Object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

1.4.3 Packet Buffer (PBM) Object. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

1.4.4 NDK Interrupt Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9

1.4.5 Data Alignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9

1.5 API Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

2 NIMU Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

This chapter describes Network Interface Management Unit (NIMU) layer API.

2.1 Overview of the NIMU Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

2.2 NIMU APIs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

3 Ethernet Mini-Driver Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

This chapter describes Ethernet mini-driver layer interface.

3.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

3.2 Data Structures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

3.3 Ethernet Mini-Driver APIs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

3.3.1 HwPktInit — Initialize Packet Driver Environment . . . . . . . . . . . . . . . . . . . . .3-5

3.3.2 HwPktOpen — Open Ethernet Device Instance. . . . . . . . . . . . . . . . . . . . . . .3-5

3.3.3 HwPktClose — Close Ethernet Device and Disable Interrupts . . . . . . . . . . .3-5

3.3.4 HwPktSetRx — Configure the Ethernet Receive Filter Settings . . . . . . . . . .3-6

3.3.5 HwPktIoctl — Execute Driver-Specific IOCTL Commands . . . . . . . . . . . . . .3-6

3.3.6 HwPktTxNext — Transmit Next Buffer in the Transmit Queue . . . . . . . . . . .3-6

3.3.7 _HwPktPoll — Mini-Driver Polling Function . . . . . . . . . . . . . . . . . . . . . . . . . .3-7

3.4 Configuration Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7

Contents

4 Generic EMAC/MDIO CSL Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

This chapter describes the EMAC/MDIO CSL layer interface.

4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4.2 CSL Data Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4.3 EMAC APIs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4.4 Callback Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

4.4.1 pfcbGetPacket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

4.4.2 pfcbFreePacket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

4.4.3 pfcbRxPacket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

4.4.4 pfcbStatus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

4.4.5 pfcbStatistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

1-1

Chapter 1

Architecture Overview

This chapter provides an overview of the terminology and components

involved in the Network Developer's Kit Support Package (NSP) Ethernet

driver. It also describes the architecture of such drivers.

1.1 Acronyms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2

1.2 Ethernet Driver Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3

1.3 Flow Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6

1.4 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–8

1.5 API Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–10

Topic Page

Acronyms

1-2

1.1 Acronyms

The following acronyms are used in this document:

Table 1–1 Acronyms

Acronym Description

API Application Programming Interface

BD Buffer Descriptor

CSL Chip Support Library

DSP Digital Signal Processor

EMAC Ethernet Medium Access Protocol

LL Low Level Packet Driver

MDIO Management Data Input/Output Interface

NDK Network Developer's Kit

NIMU Network Interface Management Unit

NSP NDK Support Package

OS AL Operating Systems Abstraction Layer

Rx Receive Operation

SGMII Serial Gigabit Media Independent Interface

Tx Transmit Operation

Ethernet Driver Architecture

Architecture Overview 1-3

1.2 Ethernet Driver Architecture

The following diagram shows the architecture of the Ethernet driver

design in the NDK 2.0 Support Package (NSP).

This new NSP Ethernet driver architecture consists of the following

components:

❏NIMU-specific layer, which acts as the interface between the NDK

stack and the Ethernet driver. See Section 1.2.1.

❏Ethernet mini-driver, which manages the EMAC configuration

using the CSL. Also manages DSP interrupts and memory allocation

for packet buffers in buffer descriptors using the NDKOperating Systems

Abstraction Layer (OS AL). See Section 1.2.2.

❏Generic EMAC/MDIO Chip Support Library (CSL), which contains

the generic APIs and data structures needed to control and configure

EMAC/MDIO peripherals. Also manages buffer descriptors and

interrupt service routines. See Section 1.2.3.

NDK

NSP Ethernet

Driver

Hardware

Software

NDK Core Stack

NIMU NDK Core Layer

NIMU-specific layer

Ethernet PHY(s)

Ethernet mini-driver

Generic EMAC/MDIO Chip Support

Library (CSL)

Ethernet Driver Architecture

1-4

The NIMU-specific layer in previous versions of the NDK was generic

enough to be ported to different platforms with ease. However, the mini-

driver was not easily portable and had to be rewritten from scratch every

time it had to be ported to a new platform. This led to different flavors of

the Ethernet device drivers for different platforms—thus increasing the

development, maintenance, and debugging effort.

To overcome the limitations of this architecture, the architecture of

Ethernet drivers in the NSPs have been reorganized to optimize for a

better development and debugging experience. The Generic

EMAC/MDIO Chip Support Library (CSL) component is new; it has been

split apart from the Ethernet mini-driver component to better isolate

portions that commonly require changes when porting.

1.2.1 NIMU-Specific Layer

The Network Interface Management Unit (NIMU) specific layer acts as

the interface between the Ethernet driver and the NDK core stack. It

provides an implementation for the APIs defined by the NIMU

specification for this EMAC device. These APIs let the NDK core stack

control and configure the EMAC device at runtime and transmit packets.

They also enable the driver to hand any received packets back to the

stack.

This layer is fairly generic and doesn't change between different

platforms.

This layer's functionality and role are the same as in versions of NDK

prior to v2.0.

1.2.2 Ethernet Mini-Driver

This layer is responsible for setting up parameters for EMAC and MDIO

configuration according to system needs. It uses APIs and data

structures exported by the underlying Chip Support Library (CSL) layer.

It is also responsible for setting up EMAC interrupts into the DSP using

data structures and APIs exposed by the "Interrupt Manager Wrapper" in

the NDK OS AL.

This layer acts as the sole memory manager in the Ethernet driver. That

is, it handles all memory allocations, initializations, and frees of packet

buffers for use in the buffer descriptors (BDs) in the Transmit (Tx) and

Receive (Tx) paths. For memory management, it again uses the data

structures and APIs defined by the NDK OS AL.

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