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| author | Tomasz Nowicki <tn@semihalf.com> | 2016-12-01 07:07:56 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <helgaas@kernel.org> | 2016-12-06 20:45:49 +0100 |
| commit | 44f22bd91e88f9a1203a6e564a237e593f5f2f74 (patch) | |
| tree | c4c5e1e3305986af0fc32be51e804be5e1f24d00 /drivers/pci/host/Kconfig | |
| parent | PCI: thunder-pem: Factor out resource lookup (diff) | |
| download | linux-44f22bd91e88f9a1203a6e564a237e593f5f2f74.tar.xz linux-44f22bd91e88f9a1203a6e564a237e593f5f2f74.zip | |
PCI: Add MCFG quirks for Cavium ThunderX pass2.x host controller
ThunderX PCIe controller to off-chip devices (so-called PEM) is not fully
compliant with ECAM standard. It uses non-standard configuration space
accessors (see thunder_pem_ecam_ops) and custom configuration space
granulation (see bus_shift = 24). In order to access configuration space
and probe PEM as ACPI-based PCI host controller we need to add MCFG quirk
infrastructure. This involves:
1. A new thunder_pem_acpi_init() init function to locate PEM-specific
register ranges using ACPI.
2. Export PEM thunder_pem_ecam_ops structure so it is visible to MCFG quirk
code.
3. New quirk entries for each PEM segment. Each contains platform IDs,
mentioned thunder_pem_ecam_ops and CFG resources.
Quirk is considered for ThunderX silicon pass2.x only which is identified
via MCFG revision 1.
ThunderX pass 2.x requires the following accessors:
NUMA Node 0 PCI segments 0- 3: pci_generic_ecam_ops (ECAM-compliant)
NUMA Node 0 PCI segments 4- 9: thunder_pem_ecam_ops (MCFG quirk)
NUMA Node 1 PCI segments 10-13: pci_generic_ecam_ops (ECAM-compliant)
NUMA Node 1 PCI segments 14-19: thunder_pem_ecam_ops (MCFG quirk)
[bhelgaas: adapt to use acpi_get_rc_resources(), update Makefile/ifdefs so
quirk doesn't depend on CONFIG_PCI_HOST_THUNDER_PEM]
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/host/Kconfig')
| -rw-r--r-- | drivers/pci/host/Kconfig | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index d7e7c0a827c3..1239a8e63368 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -240,7 +240,8 @@ config PCIE_QCOM config PCI_HOST_THUNDER_PEM bool "Cavium Thunder PCIe controller to off-chip devices" - depends on OF && ARM64 + depends on ARM64 + depends on OF || (ACPI && PCI_QUIRKS) select PCI_HOST_COMMON help Say Y here if you want PCIe support for CN88XX Cavium Thunder SoCs. |