summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/pci
diff options
context:
space:
mode:
authorDavid Daney <david.daney@cavium.com>2016-03-04 14:31:48 -0800
committerBjorn Helgaas <bhelgaas@google.com>2016-03-11 16:10:48 -0600
commit7b6e7ba8e81a862e20d213d90aa5ba1e5a02aba6 (patch)
tree56ba0d0986a399fc3f7e49ba7f90fb3511d8b695 /Documentation/devicetree/bindings/pci
parentf12b76e56ada6e276a3d45b60c4e26e2dda7e547 (diff)
PCI: thunder: Add driver for ThunderX-pass{1,2} on-chip devices
The cavium,pci-thunder-ecam devices are exactly ECAM-based PCI root complexes. These root complexes (loosely referred to as ECAM units in the hardware manuals) are used to access the Thunder on-chip devices. They are special in that all the BARs on devices behind these root complexes are at fixed addresses. Add a driver for these devices that synthesizes Enhanced Allocation (EA) capability entries for each BAR. Since this EA synthesis is needed for exactly two chip models, we can hard- code some assumptions about the device topology and the layout of the config space of specific DEVFNs in the driver. [bhelgaas: changelog, whitespace] Signed-off-by: David Daney <david.daney@cavium.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'Documentation/devicetree/bindings/pci')
-rw-r--r--Documentation/devicetree/bindings/pci/pci-thunder-ecam.txt30
1 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pci/pci-thunder-ecam.txt b/Documentation/devicetree/bindings/pci/pci-thunder-ecam.txt
new file mode 100644
index 000000000000..f478874b79ce
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/pci-thunder-ecam.txt
@@ -0,0 +1,30 @@
+* ThunderX PCI host controller for pass-1.x silicon
+
+Firmware-initialized PCI host controller to on-chip devices found on
+some Cavium ThunderX processors. These devices have ECAM-based config
+access, but the BARs are all at fixed addresses. We handle the fixed
+addresses by synthesizing Enhanced Allocation (EA) capabilities for
+these devices.
+
+The properties and their meanings are identical to those described in
+host-generic-pci.txt except as listed below.
+
+Properties of the host controller node that differ from
+host-generic-pci.txt:
+
+- compatible : Must be "cavium,pci-host-thunder-ecam"
+
+Example:
+
+ pcie@84b000000000 {
+ compatible = "cavium,pci-host-thunder-ecam";
+ device_type = "pci";
+ msi-parent = <&its>;
+ msi-map = <0 &its 0x30000 0x10000>;
+ bus-range = <0 31>;
+ #size-cells = <2>;
+ #address-cells = <3>;
+ #stream-id-cells = <1>;
+ reg = <0x84b0 0x00000000 0 0x02000000>; /* Configuration space */
+ ranges = <0x03000000 0x8180 0x00000000 0x8180 0x00000000 0x80 0x00000000>; /* mem ranges */
+ };