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Commit 6f68c91c authored by Myron Stowe's avatar Myron Stowe Committed by Len Brown
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ACPI: Export interfaces for ioremapping/iounmapping ACPI registers 



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: default avatarMyron Stowe <myron.stowe@redhat.com>
Acked-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent bc9ffce2

drivers/acpi/osl.c

+4 −2
Original line number Diff line number Diff line
@@ -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

include/linux/acpi_io.h

+3 −0
Original line number Diff line number Diff line
@@ -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