AM5718: PCIe EP driver

user5011627

Part Number: AM5718

Hi,

I want to use Cortex-A15 MPU core to run Linux program and communicate with the Host computer through PCI-E interface. In general, MPU is the Endpoint of PCI-E system, and the Host computer is the Root Complex.

I know that when the MPU is the master device, it needs to compile Linux driver to drive the PCIe slave device. But if the MPU is a slave device, how should I compile the PCIe driver?

I need to compile the PCIe driver as if the MPU were the master device? Or I don't need to compile the PCIe driver, the master device can access to the MPU though the PCIe Controller of AM5718.

Where can I get the example program?

Thank you for your reply.

over 6 years ago

0 Bin Liu over 6 years ago

TI__Guru**** 181006 points

Hi,

Please refer to the document in the link below.

0 user5011627 over 6 years ago

Intellectual 340 points

Part Number: AM5718

I want to use Cortex-A15 MPU core to run Linux program and communicate with the Host computer through PCI-E interface. And the MPU is the Endpoint of PCI-E system.

I have checked the technical manual and I find that "For the PCIe_SS1 controller the PCIe outbound window is mapped within range 0x20000000 - 0x2FFFFFFF of the device L3_MAIN memory space."

Is that mean the MPU(as a slave device) can be regarded as the extended storage of the master device, with the storage space range of 0x20000000 - 0x2FFFFFFF?

The memory range of 0x20000000 - 0x2FFFFFFF can be uesd as a DUAL-PORT RAM between the MPU and the Host Computer, the Host can directly access this storage area as the extended storage?

Thank you for your reply.

0 user5011627 over 6 years ago in reply to Bin Liu

Intellectual 340 points

Thank you !

0 Bin Liu over 6 years ago in reply to user5011627

TI__Guru**** 181006 points

Hi,

The address 0x2000000-0x2FFFFFFF is only meaningful to AM5718, and the host (PCIe RC) cannot directly access this address. Please refer to the PCI/PCIe Specs.

0 user5011627 over 6 years ago in reply to Bin Liu

Intellectual 340 points

Thank you!

By the way, How should I find the complete driver program when I use AM5718 as EP?

0 Bin Liu over 6 years ago in reply to user5011627

TI__Guru**** 181006 points

Hi,

I am not sure what you meant by "complete driver program", I hope you know the Linux kernel has multiple layers for each function, PCIe EP is not an exemption. But hope the following information helps.

The PCIe controller driver is at kernel source drivers/pci/controller/*

The PCIe core driver is at drivers/pci/pcie/*

The EP core driver is at drivers/pci/endpoint/*

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AM5718: PCIe EP driver