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TDA4VH-Q1: PCIE DMA from RC driver

sun ruijie
Intellectual 603 points
Part Number: TDA4VH-Q1
Other Parts Discussed in Thread: TDA4VH

Tool/software:

Hi, TI expert, 

From TI PCIE driver(pci-epf-test.c)the PCIE DMA is performed from PCIE EP driver side.   

There is a question,  can we perform PCIE DMA from PCIE RC driver?

Is there any example driver code for  it? 

From TDA4VH manual, it seems the PCIE DMA can start from both RC and EP side. 

Best Regards

Ruijie

  • 0
    TI__Guru 50393 points

    Hi Ruijie,

    Yes, DMA setup on RC-side is possible. In Linux prompt, "lspci -vvv" can be used to find out what memory ranges are accessible on the EP from RC to get the full PCIe address space enumerated by the RC.

    Then to set up DMA you would need to call APIs to convert virtual address to physical address. You can refer to the existing epf example on those DMA APIs. 

    Regards,

    Takuma

  • 0
    TI__Expert 8531 points

    Hello Rujie

        is this issue solved ?

    Regards

       Semon