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authorTomasz Nowicki <tn@semihalf.com>2016-12-01 00:07:56 -0600
committerBjorn Helgaas <helgaas@kernel.org>2016-12-06 13:45:49 -0600
commit44f22bd91e88f9a1203a6e564a237e593f5f2f74 (patch)
treec4c5e1e3305986af0fc32be51e804be5e1f24d00 /include/linux/pci-ecam.h
parent0d414268fb8d0844030f87027e904f69d96706be (diff)
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 'include/linux/pci-ecam.h')
-rw-r--r--include/linux/pci-ecam.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
index bdacbc883a22..e88d7db74200 100644
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h
@@ -62,6 +62,7 @@ extern struct pci_ecam_ops pci_generic_ecam_ops;
#if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)
extern struct pci_ecam_ops pci_32b_ops; /* 32-bit accesses only */
extern struct pci_ecam_ops hisi_pcie_ops; /* HiSilicon */
+extern struct pci_ecam_ops thunder_pem_ecam_ops; /* Cavium ThunderX 2.x */
#endif
#ifdef CONFIG_PCI_HOST_GENERIC