user/sven/linux.git/include/linux/acpi_io.h, branch v3.3.5

ACPI: Export interfaces for ioremapping/iounmapping ACPI registers

2012-01-17T09:35:20Z

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 Acked-by: Rafael J. Wysocki Signed-off-by: Len Brown

ACPI: Introduce acpi_os_get_iomem()

2011-02-24T18:58:42Z

Introduce function acpi_os_get_iomem() that may be used by its callers to get a reference to an ACPI iomap. Signed-off-by: Rafael J. Wysocki

ACPI: Do not export functions that are only used in osl.c

2011-02-24T18:58:41Z

The functions acpi_os_map_generic_address() and acpi_os_unmap_generic_address() are only used in drivers/acpi/osl.c, so make them static and remove the extern definitions of them from include/linux/acpi_io.h. Signed-off-by: Rafael J. Wysocki

ACPI: Introduce acpi_os_ioremap()

2011-01-21T02:30:17Z

Commit ca9b600be38c ("ACPI / PM: Make suspend_nvs_save() use acpi_os_map_memory()") attempted to prevent the code in osl.c and nvs.c from using different ioremap() variants by making the latter use acpi_os_map_memory() for mapping the NVS pages. However, that also requires acpi_os_unmap_memory() to be used for unmapping them, which causes synchronize_rcu() to be executed many times in a row unnecessarily and introduces substantial delays during resume on some systems. Instead of using acpi_os_map_memory() for mapping the NVS pages in nvs.c introduce acpi_os_ioremap() calling ioremap_cache() and make the code in both osl.c and nvs.c use it. Reported-by: Jeff Chua Signed-off-by: Rafael J. Wysocki Signed-off-by: Linus Torvalds