Other Parts Discussed in Thread: XIO2001
I have Linux running on the A15 of the AM5749 and TI-RTOS running the PDK PCIe example on the M4 IPU.
The PCIe bus has a Hilscher CIFX 90 "Profinet Master" card, which (unfortunately for the PDK PCIe driver) contains a PCIe to PCI bridge. See attached picture.
The PCIe example will talk to the XIO2001 bridge as the remote device, but provides no way to talk to the CIFX module behind the XIO2001 bridge.
If I boot to Linux, the pcie bus is enumerated as follows:
root@am57xx-evm:~# lspci -v
00:00.0 PCI bridge: Texas Instruments Multicore DSP+ARM KeyStone II SOC (rev 01) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 169
Memory at 20100000 (64-bit, non-prefetchable) [size=1M]
Bus: primary=00, secondary=01, subordinate=ff, sec-latency=0
I/O behind bridge: None
Memory behind bridge: 20200000-202fffff [size=1M]
Prefetchable memory behind bridge: None
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Root Port (Slot-), MSI 00
Capabilities: [100] Advanced Error Reporting
Kernel driver in use: pcieport
01:00.0 PCI bridge: Texas Instruments XIO2001 PCI Express-to-PCI Bridge (prog-if 00 [Normal decode])
Flags: fast devsel
Bus: primary=01, secondary=02, subordinate=02, sec-latency=0
I/O behind bridge: None
Memory behind bridge: 20200000-202fffff [size=1M]
Prefetchable memory behind bridge: None
Capabilities: [40] Subsystem: Device 0000:0000
Capabilities: [48] Power Management version 3
Capabilities: [50] MSI: Enable- Count=1/16 Maskable- 64bit+
Capabilities: [70] Express PCI-Express to PCI/PCI-X Bridge, MSI 00
Capabilities: [100] Advanced Error Reporting
02:00.0 Unassigned class [ff00]: Hilscher GmbH CIFX 50E-DP(M/S)
Flags: medium devsel
Memory at 20200000 (32-bit, non-prefetchable) [disabled] [size=64K]
There was a similar, and perhaps more difficult case here: e2e.ti.com/.../611298
I see two main approaches (maybe there are more?):
1) Let Linux enumerate and configure the PCIe. Afterwards, disable the PCIE interrupt registration in Linux and have the M4 drive the PICe with the PDK PCIe driver.
- OR -
2) Strip the PCIe from the Linux device tree, and add enumeration features to the PDK PCIe driver.
Can you outline a preferred method to proceed?
Thank you for your help
Greg.
