Eric Lee / smarc-fsl-linux-kernel

04 Nov, 2008

1 commit

31 Oct, 2008

1 commit

  • 9663f2e6a   resources: add io-mapping functions to dynamically map large device apertures ... Browse Code »

    Impact: add new generic io_map_*() APIs

    Graphics devices have large PCI apertures which would consume a significant
    fraction of a 32-bit address space if mapped during driver initialization.
    Using ioremap at runtime is impractical as it is too slow.

    This new set of interfaces uses atomic mappings on 32-bit processors and a
    large static mapping on 64-bit processors to provide reasonable 32-bit
    performance and optimal 64-bit performance.

    The current implementation sits atop the io_map_atomic fixmap-based
    mechanism for 32-bit processors.

    This includes some editorial suggestions from Randy Dunlap for
    Documentation/io-mapping.txt

    Signed-off-by: Keith Packard
    Signed-off-by: Eric Anholt
    Signed-off-by: Ingo Molnar

    Keith Packard