• John Keller's avatar
    Altix: Add initial ACPI IO support · 8ea6091f
    John Keller authored
    First phase in introducing ACPI support to SN.
    In this phase, when running with an ACPI capable PROM,
    the DSDT will define the root busses and all SN nodes
    (SGIHUB, SGITIO). An ACPI bus driver will be registered
    for the node devices, with the acpi_pci_root_driver being
    used for the root busses. An ACPI vendor descriptor is
    now used to pass platform specific information for both
    nodes and busses, eliminating the need for the current
    SAL calls. Also, with ACPI support, SN fixup code is no longer
    needed to initiate the PCI bus scans, as the acpi_pci_root_driver
    does that.
    
    However, to maintain backward compatibility with non-ACPI capable
    PROMs, none of the current 'fixup' code can been deleted, though
    much restructuring has been done. For example, the bulk of the code
    in io_common.c is relocated code that is now common regardless
    of what PROM is running, while io_acpi_init.c and io_init.c contain
    routines specific to an ACPI or non ACPI capable PROM respectively.
    
    A new pci bus fixup platform vector has been created to provide
    a hook for invoking platform specific bus fixup from pcibios_fixup_bus().
    
    The size of io_space[] has been increased to support systems with
    large IO configurations.
    Signed-off-by: default avatarJohn Keller <jpk@sgi.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    
    8ea6091f
pcidev.h 2.74 KB