5.7. Texas Instruments CPSWG for AM6x and Jacinto 7 - emllCPSWG

The parameters to the CPSWG Link Layer are setup-specific. The function CreateLinkParmsFromCmdLineCPSWG() in EcSelectLinkLayer.cpp demonstrates how to initialize the Link Layer instance.

struct EC_T_LINK_PARMS_CPSWG

Public Members

EC_T_LINK_PARMS linkParms

Common link parameters. Signature must be set to EC_LINK_PARMS_SIGNATURE_CPSWG

EC_T_DWORD dwPhyAddr

PHY address

EC_T_PHYINTERFACE ePhyInterface

PHY interface type

EC_T_BOOL bMaster

EC_TRUE: Initialize MAC

EC_T_DWORD dwTxDmaDesCnt

Transmit DMA descriptor buffer count. maximum 500

EC_T_DWORD dwRxDmaDesCnt

Receive DMA descriptor buffer count. maximum 500

EC_T_BOOL bNotUseDmaBuffers

Use buffers from DMA (EC_FALSE) or from heap for receive. AllocSend is not supported, when EC_TRUE

enum EC_T_CPSWG_TYPE

Values:

enumerator eCPSWG_AM654X

TI AM654x

enumerator eCPSWG_TDA4X

TI TDA4x (Jacinto 7)

enumerator eCPSWG_AM64X

TI AM64x

enumerator eCPSWG_AM62X

TI AM62x

5.7.1. CPSWG usage under Linux

The unbind feature of the am65-cpsw-nuss Linux driver isn’t supported and the atemsys kernel module must be assigned as driver for the platform device. So the "ethernet/am654-cpsw-nuss" device tree node must be modified, by changing compatible = "atemsys"; and adding atemsys-Ident = "CPSWG"; and atemsys-Instance = <0x1>;, also remove or comment out dma-coherent;.

ethernet@46000000 {
    compatible = "atemsys";
    atemsys-Ident = "CPSWG";
    atemsys-Instance = <0x1>;
    ...
    #dma-coherent;
    ...

So the "ethernet/am642-cpsw-nuss" device tree node must be modified likewise. Second port of am642-cpsw-nuss is not supported.

ethernet@8000000 {
    compatible = "atemsys";
    atemsys-Ident = "CPSWG";
    atemsys-Instance = <0x1>;
    ...
    #dma-coherent;
    ...

Currently following Linux versions are supported:

  • ti-processor-sdk-linux-rt-am65xx-evm-07_01_00_18 (tested on AM65 IDK)

  • ti-processor-sdk-linux-rt-am65xx-evm-08.06.00.47 (tested on AM65 IDK)

  • ti-processor-sdk-linux-rt-j7-evm-08_06_01_02 (tested on SK-TDA4VM)

  • ti-processor-sdk-linux-rt-j7-evm-08_06_01_02 (tested on SK-TDA4VM)

  • ti-processor-sdk-linux-edgeai-j721e-evm-09_01_00_06 (tested on SK-TDA4VM)

  • ti-processor-sdk-linux-rt-am64xx-evm-08.02.00.14 (tested on TMDS64GPEVM)

  • ti-processor-sdk-linux-rt-am64xx-evm-09.02.00.08 (tested on TMDS64GPEVM)

  • SolidRun ti_am64x_build/20240221 microsd-debian-bookworm-sr1 (tested on AM64 HummingBoard-T)

  • toradex_ti-linux-6.1.y Linux/arm64 6.1.46 Kernel (tested on Toradex Verdin AM62)