diff options
| author | Rafael J. Wysocki <rjw@sisk.pl> | 2011-02-08 23:38:25 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-02-24 19:58:42 +0100 |
| commit | 13606a2de1996f8d83a9ce296f74022bdbadf712 (patch) | |
| tree | 02ad0403378ad222dd1ed021ed80fe10fe9a6b39 | |
| parent | b7c1fadd6c2eead56d0664a3a921980120de0c11 (diff) | |
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>
| -rw-r--r-- | drivers/acpi/osl.c | 16 | ||||
| -rw-r--r-- | include/linux/acpi_io.h | 2 |
2 files changed, 18 insertions, 0 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 5389f9f2e2f..52ca8721bc9 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -285,6 +285,22 @@ acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size) return NULL; } +void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) +{ + struct acpi_ioremap *map; + void __iomem *virt = NULL; + + mutex_lock(&acpi_ioremap_lock); + map = acpi_map_lookup(phys, size); + if (map) { + virt = map->virt + (phys - map->phys); + map->refcount++; + } + mutex_unlock(&acpi_ioremap_lock); + return virt; +} +EXPORT_SYMBOL_GPL(acpi_os_get_iomem); + /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */ static struct acpi_ioremap * acpi_map_lookup_virt(void __iomem *virt, acpi_size size) diff --git a/include/linux/acpi_io.h b/include/linux/acpi_io.h index 28a3ae279d7..4afd7102459 100644 --- a/include/linux/acpi_io.h +++ b/include/linux/acpi_io.h @@ -10,4 +10,6 @@ static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys, return ioremap_cache(phys, size); } +void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size); + #endif |