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PCI: thunder: Add driver for ThunderX-pass{1,2} on-chip devices

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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>
This commit is contained in:
David Daney
2016-03-04 14:31:48 -08:00
committed by Bjorn Helgaas
parent f12b76e56a
commit 7b6e7ba8e8
4 changed files with 441 additions and 0 deletions
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7
drivers/pci/host/Kconfig
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@@ -202,4 +202,11 @@ config PCI_HOST_THUNDER_PEM
help
Say Y here if you want PCIe support for CN88XX Cavium Thunder SoCs.
config PCI_HOST_THUNDER_ECAM
bool "Cavium Thunder ECAM controller to on-chip devices on pass-1.x silicon"
depends on OF && ARM64
select PCI_HOST_COMMON
help
Say Y here if you want ECAM support for CN88XX-Pass-1.x Cavium Thunder SoCs.
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