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    Subject[PATCH 40/50] ACPI: Export interfaces for ioremapping/iounmapping ACPI registers
    Date
    From: Myron Stowe <mstowe@redhat.com>

    Export remapping and unmapping interfaces - acpi_os_map_generic_address()
    and acpi_os_unmap_generic_address() - for ACPI generic registers that are
    backed by memory mapped I/O (MMIO).

    The acpi_os_map_generic_address() and acpi_os_unmap_generic_address()
    declarations may more properly belong in include/acpi/acpiosxf.h next to
    acpi_os_read_memory() but I believe that would require the ACPI CA making
    them an official part of the ACPI CA - OS interface.

    ACPI Generic Address Structure (GAS) reference (ACPI's fixed/generic
    hardware registers use the GAS format):
    ACPI Specification, Revision 4.0, Section 5.2.3.1, "Generic Address
    Structure"

    Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
    Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
    Signed-off-by: Len Brown <len.brown@intel.com>
    ---
    drivers/acpi/osl.c | 6 ++++--
    include/linux/acpi_io.h | 3 +++
    2 files changed, 7 insertions(+), 2 deletions(-)

    diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
    index 2e285cd..b11f267 100644
    --- a/drivers/acpi/osl.c
    +++ b/drivers/acpi/osl.c
    @@ -431,7 +431,7 @@ void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
    __acpi_unmap_table(virt, size);
    }

    -static int acpi_os_map_generic_address(struct acpi_generic_address *gas)
    +int acpi_os_map_generic_address(struct acpi_generic_address *gas)
    {
    u64 addr;
    void __iomem *virt;
    @@ -450,8 +450,9 @@ static int acpi_os_map_generic_address(struct acpi_generic_address *gas)

    return 0;
    }
    +EXPORT_SYMBOL(acpi_os_map_generic_address);

    -static void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
    +void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
    {
    u64 addr;
    struct acpi_ioremap *map;
    @@ -475,6 +476,7 @@ static void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)

    acpi_os_map_cleanup(map);
    }
    +EXPORT_SYMBOL(acpi_os_unmap_generic_address);

    #ifdef ACPI_FUTURE_USAGE
    acpi_status
    diff --git a/include/linux/acpi_io.h b/include/linux/acpi_io.h
    index 4afd710..b0ffa21 100644
    --- a/include/linux/acpi_io.h
    +++ b/include/linux/acpi_io.h
    @@ -12,4 +12,7 @@ static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,

    void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size);

    +int acpi_os_map_generic_address(struct acpi_generic_address *addr);
    +void acpi_os_unmap_generic_address(struct acpi_generic_address *addr);
    +
    #endif
    --
    1.7.9.rc1


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