On Tue, May 10, 2016 at 5:19 PM, Tomasz Nowicki <tn@xxxxxxxxxxxx> wrote: > This patch is going to implement generic PCI host controller for > ACPI world, similar to what pci-host-generic.c driver does for DT world. > > All such drivers, which we have seen so far, were implemented within > arch/ directory since they had some arch assumptions (x86 and ia64). > However, they all are doing similar thing, so it makes sense to find > some common code and abstract it into the generic driver. > > In order to handle PCI config space regions properly, we define new > MCFG interface which does sanity checks on MCFG table and keeps its > root pointer. User is able to lookup MCFG regions based on that root > pointer and specified domain:bus_start:bus_end touple. We are using > pci_mmcfg_late_init old prototype to avoid another function name. > > The implementation of pci_acpi_scan_root() looks up the MCFG entries > and sets up a new mapping (regions are not mapped until host controller ask > for it). Generic PCI functions are used for accessing config space. > Driver selects PCI_ECAM and uses functions from drivers/pci/ecam.h > to create and access ECAM mappings. > > As mentioned in Kconfig help section, ACPI_PCI_HOST_GENERIC choice > should be made on a per-architecture basis. > > Signed-off-by: Tomasz Nowicki <tn@xxxxxxxxxxxx> > Signed-off-by: Jayachandran C <jchandra@xxxxxxxxxxxx> > --- > drivers/acpi/Kconfig | 8 +++ > drivers/acpi/Makefile | 1 + > drivers/acpi/pci_mcfg.c | 97 ++++++++++++++++++++++++++ > drivers/acpi/pci_root_generic.c | 149 ++++++++++++++++++++++++++++++++++++++++ Why do we need a new file? Would there be any problem with adding that code to pci_root.c? -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
