Hi, Benjamin
Benjamin Herrenschmidt wrote:
Right. However, in case it's a bit too much work to get
hotswap implemented on the machine, you may still be able
to do something simpler from your platform code, after you've
finished loading the FPGA. I assume the FPGA doesn't contain a
P2P bridge that would require probing further below the FPGA
itself.
The basic idea is to call pci_scan_slot() on the devfn where
the FPGA is supposed to respond.
Then you need to also do some fixup. First you need to call
pcibios_setup_bus_devices(). This will wire up the device
to an OF node if you have one, setup some default DMA ops,
etc...
Note that this function will walk over all devices on that bus
which is interesting since some of those may have already been
fully setup initially. Hopefully that isn't a problem. If it
was to become one, we would have to figure out a way to skip
devices that have already been "setup".
And finally you call pcibios_finish_adding_to_bus() which will
do the resource allocation pass on all new devices on the bus
and register them with the core device layer.
Cheers,
Ben.
Thanks for the advice. This approach worked well for me, with some minor
modifications. First I had to clear PPC_INDIRECT_TYPE_NO_PCIE_LINK
in hose->indirect_type, otherwise reads from configuration space fail. And
second, I had to call pci_assign_resource() to complete the assignment
of FPGA
memory. The memory range is 0x0 - 0x7fffff, and PCI code doesn't like
resources
starting at 0.
Again, thanks a lot for your help, much appreciated.
Felix.
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