7b6e7ba8e8
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>
31 lines
1,023 B
Plaintext
31 lines
1,023 B
Plaintext
* ThunderX PCI host controller for pass-1.x silicon
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Firmware-initialized PCI host controller to on-chip devices found on
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some Cavium ThunderX processors. These devices have ECAM-based config
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access, but the BARs are all at fixed addresses. We handle the fixed
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addresses by synthesizing Enhanced Allocation (EA) capabilities for
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these devices.
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The properties and their meanings are identical to those described in
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host-generic-pci.txt except as listed below.
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Properties of the host controller node that differ from
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host-generic-pci.txt:
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- compatible : Must be "cavium,pci-host-thunder-ecam"
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Example:
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pcie@84b000000000 {
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compatible = "cavium,pci-host-thunder-ecam";
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device_type = "pci";
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msi-parent = <&its>;
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msi-map = <0 &its 0x30000 0x10000>;
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bus-range = <0 31>;
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#size-cells = <2>;
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#address-cells = <3>;
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#stream-id-cells = <1>;
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reg = <0x84b0 0x00000000 0 0x02000000>; /* Configuration space */
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ranges = <0x03000000 0x8180 0x00000000 0x8180 0x00000000 0x80 0x00000000>; /* mem ranges */
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};
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