All this code is needed to properly initialize the 460EX PCIe host
bridge(s). We re-initialize all ports again, even though this has been done
in the bootloader (U-Boot) before. This way we make sure, that we always
run the latest init code in Linux and don't depend on code versions from
U-Boot.
Unfortunately all IBM/AMCC chips currently supported in this PCIe driver need
a different reset-/init-sequence.
Tested on AMCC Canyonlands eval board.
Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
This improves the way the 4xx PCI-E code handles checking for a link
and adds explicit testing of CRS result codes on config space accesses.
This should make it more reliable.
Also, bridges with no link are now still created, though config space
accesses beyond the root complex are filtered. This is one step toward
eventually supporting hotplug.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
This adds to the previous 2 patches the support for the 4xx PCI Express
cells as found in the 440SPe revA, revB and 405EX.
Unfortunately, due to significant differences between these, and other
interesting "features" of those pieces of HW, the code isn't as simple
as it is for PCI and PCI-X and some of the functions differ significantly
between the 3 implementations. Thus, not only this code can only support
those 3 implementations for now and will refuse to operate on any other,
but there are added ifdef's to avoid the bloat of building a fairly large
amount of code on platforms that don't need it.
Also, this code currently only supports fully initializing root complex
nodes, not endpoint. Some more code will have to be lifted from the
arch/ppc implementation to add the endpoint support, though it's mostly
differences in memory mapping, and the question on how to represent
endpoint mode PCI in the device-tree is thus open.
Many thanks to Stefan Roese for testing & fixing up the 405EX bits !
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
This adds to the previous patch the support for the 4xx PCI 2.x
bridges.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
This adds base support code for the 4xx PCI-X bridge. It also provides
placeholders for the PCI and PCI-E version but they aren't supported
with this patch.
The bridges are configured based on device-tree properties.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Stefan Roese
Benjamin Herrenschmidt