linux-next/include/linux/acpi_io.h

#ifndef _ACPI_IO_H_
#define _ACPI_IO_H_

#include <linux/io.h>
#include <acpi/acpi.h>

static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
					    acpi_size size)
{
       return ioremap_cache(phys, size);
}

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
ACPI: Introduce acpi_os_ioremap() 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 <jeff.chua.linux@gmail.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 2011-01-20 05:27:14 +08:00			`#ifndef _ACPI_IO_H_`
			`#define _ACPI_IO_H_`

			`#include <linux/io.h>`
			`#include <acpi/acpi.h>`

			`static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,`
			`acpi_size size)`
			`{`
			`return ioremap_cache(phys, size);`
			`}`

ACPI: Introduce acpi_os_get_iomem() 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 <rjw@sisk.pl> 2011-02-09 06:38:25 +08:00			`void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size);`

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: Myron Stowe <myron.stowe@redhat.com> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com> 2011-11-08 07:23:34 +08:00			`int acpi_os_map_generic_address(struct acpi_generic_address *addr);`
			`void acpi_os_unmap_generic_address(struct acpi_generic_address *addr);`

ACPI: Introduce acpi_os_ioremap() 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 <jeff.chua.linux@gmail.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 2011-01-20 05:27:14 +08:00			`#endif`