This is a very simple and generic implementation of a PCI host controller based on ACPI. This approach does not pull in the MMCONFIG and ECAM code from x86. The MCFG table is a simple ACPI table, and there is no need to move the complex code from x86 (sorted linked list with a lot of global vars) to acpi for parsing it. The config space access is done with pci-host-generic style simple mapping and generic PCI config read/write. This is tested with arm64 QEMU and OVMF. Comments are very welcome. I would also add that I am posting this as an option, if another implementation is accepted upstream, I would happily drop this. Thanks, JC. v1->v2: - use CONFIG_PCI_MMCONFIG on arm64, provide a weak implementation of pci_mmcfg_late_init for arm64. - The real implementation of pci_mmcfg_late_init is in pci-host-acpi.c and it will save the MCFG table entries to an array. Earlier this was done with an arch_init call - remove unneeded pci_bus_add_devices call and fix MCFG saving code - Added a patch to ACPI pci_root.c to handle arm64 PCI IO resources Jayachandran C (4): arm64: pci: Add ACPI support PCI: Handle NULL parent in pci_bus_assign_domain_nr PCI: ACPI: Add a generic ACPI based host controller ACPI: PCI: Support platforms that need pci_remap_iospace arch/arm64/Kconfig | 3 + arch/arm64/kernel/pci.c | 50 +++++++++- drivers/acpi/pci_root.c | 62 +++++++++++- drivers/acpi/resource.c | 2 + drivers/pci/host/Kconfig | 7 ++ drivers/pci/host/Makefile | 1 + drivers/pci/host/pci-host-acpi.c | 209 +++++++++++++++++++++++++++++++++++++++ drivers/pci/pci.c | 7 +- 8 files changed, 335 insertions(+), 6 deletions(-) create mode 100644 drivers/pci/host/pci-host-acpi.c -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
