On 02/08/2016 11:56 AM, Rob Herring wrote:
On Fri, Feb 05, 2016 at 03:41:15PM -0800, David Daney wrote:
From: David Daney <david.daney@xxxxxxxxxx>
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-chips devices.
They are special in that all the BARs on devices behind these root
complexes are at fixed addresses. To handle this in a manner
compatible with the core PCI code, we have the config access functions
synthesize Enhanced Allocation (EA) capability entries for each BAR.
Since this EA synthesis is needed for exactly one chip model, we can
hard code some assumptions about the device topology and the
properties of specific DEVFNs in the driver.
Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
---
.../devicetree/bindings/pci/pci-thunder-ecam.txt | 30 ++
drivers/pci/host/Kconfig | 7 +
drivers/pci/host/Makefile | 1 +
drivers/pci/host/pci-thunder-ecam.c | 358 +++++++++++++++++++++
4 files changed, 396 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/pci-thunder-ecam.txt
create mode 100644 drivers/pci/host/pci-thunder-ecam.c
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 0000000..34658f2
--- /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:
+
+ pci@84b0,00000000 {
Drop the comma,
OK...
and the node name should be "pcie".
Why pcie?
There are no PCIe devices or buses reachable from this type of root
complex. There are however many PCI devices.
Otherwise,
Acked-by: Rob Herring <robh@xxxxxxxxxx>
+ 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 */
+ };
--
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