axipcie: xaxipcie_rc_enumerate_example.c File Reference

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xaxipcie_rc_enumerate_example.c File Reference

## Overview

This file contains a design example for using AXI PCIe IP and its driver.

This is an example to show the usage of driver APIs when AXI PCIe IP is configured as a Root Port. The AXI PCIe can be configured as a Root Port only on the 7 Series Xilinx FPGA families.

The example initialises the AXI PCIe IP and shows how to enumerate the PCIe system.

Note

This example should be used only when AXI PCIe IP is configured as root complex.

This code will illustrate how the XAxiPcie IP and its standalone driver can be used to:

- Initialize a AXI PCIe IP core built as a root complex
- Enumerate PCIe end points in the system

Please note that this example enumerates and initializes PCIe end points only. It does not shows how to deal with PCIe switches (and its virtual P2P bridges)

We tried to use as much of the driver's API calls as possible to show the reader how each call could be used and that probably made the example not the shortest way of doing the tasks shown as they could be done.

      MODIFICATION HISTORY:

      Ver   Who  Date     Changes

      2.00a nm   10/19/11 Initial version of AXI PCIe root complex example
      2.02a nm   08/19/12 Removed the calls to XAxiPcie_GetLocalBusBar2PcieBar
                          and XAxiPcie_SetLocalBusBar2PcieBar as they are not
                          needed for enumeration
      3.1   ms   01/23/17 Added xil_printf statement in main function to
                          ensure that "Successfully ran" and "Failed" strings
                          are available in all examples. This is a fix for
                          CR-965028.
            ms   04/05/17 Added tabspace for return statements in functions
                          for proper documentation while generating doxygen.

    *

## Functions
int | PcieInitRootComplex (XAxiPcie *AxiPciePtr, u16 DeviceId)
| This function initializes a AXI PCIe IP built as a root complex. More...
void | PCIeEnumerateFabric (XAxiPcie *AxiPciePtr)
| This function enumerates its PCIe system and figures out the nature of each component there like end points,bridges,... More...
int | main (void)
| This function is the entry point for PCIe Root Complex Enumeration Example. More...

## Function Documentation

int main | ( | void |  | ) |

This function is the entry point for PCIe Root Complex Enumeration Example.

Parameters

  None |

Returns
  - XST_SUCCESS if successful
  - XST_FAILURE if unsuccessful.

Note
  None.

References PCIeEnumerateFabric(), and PcieInitRootComplex().

void PCIeEnumerateFabric | ( | XAxiPcie * | AxiPciePtr | ) |

This function enumerates its PCIe system and figures out the nature of each component there like end points,bridges,...

Parameters

  AxiPciePtr | is a pointer to an instance of XAxiPcie data structure represents a root complex IP.

Returns
  None.

Note
  None.

int PcieInitRootComplex | ( | XAxiPcie * | AxiPciePtr,
|  | u16 | DeviceId
| ) |  |

This function initializes a AXI PCIe IP built as a root complex.

Parameters

  AxiPciePtr | is a pointer to an instance of XAxiPcie data structure represents a root complex IP.
  DeviceId | is AXI PCIe IP unique ID

Returns
  - XST_SUCCESS if successful.
  - XST_FAILURE if unsuccessful.

Note
  None.