# Texas Instruments CPSWG for AM6x and Jacinto 7 - emllCPSWG

The parameters to the CPSWG Real-time Ethernet Driver are setup-specific.
The function `CreateLinkParmsFromCmdLineCPSWG()` in [`EcSelectLinkLayer.cpp`](_downloads/bf62c71a4a7e317930818b9da4a9815c/EcSelectLinkLayer.cpp) demonstrates how to initialize the Real-time Ethernet Driver instance.

### struct EC_T_LINK_PARMS_CPSWG

### Public Members

### [EC_T_LINK_PARMS](emll_init.html.md#_CPPv415EC_T_LINK_PARMS) linkParms

Common link parameters. Signature must be set to EC_LINK_PARMS_SIGNATURE_CPSWG. 

### [EC_T_DWORD](toc_api.html.md#_CPPv410EC_T_DWORD) dwPhyAddr

PHY address 

### [EC_T_PHYINTERFACE](emll_init.html.md#_CPPv417EC_T_PHYINTERFACE) ePhyInterface

PHY interface type 

### [EC_T_BOOL](toc_api.html.md#_CPPv49EC_T_BOOL) bMaster

EC_TRUE: Initialize MAC 

### [EC_T_DWORD](toc_api.html.md#_CPPv410EC_T_DWORD) dwTxDmaDesCnt

Transmit DMA descriptor buffer count. Maximum 500. 

### [EC_T_DWORD](toc_api.html.md#_CPPv410EC_T_DWORD) dwRxDmaDesCnt

Receive DMA descriptor buffer count. Maximum 500. 

### [EC_T_BOOL](toc_api.html.md#_CPPv49EC_T_BOOL) bNotUseDmaBuffers

EC_FALSE: Use buffers from DMA for receive (default), EC_TRUE: use buffers from heap for receive. EcLinkAllocSendFrame is not supported if bNotUseDmaBuffers = 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 

## 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;`.

```dts
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.

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

<!-- see also:: https://github.com/acontis/atemsys for more details. -->

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)