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ACPI: Introduce acpi_os_get_iomem()

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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>
This commit is contained in:
Rafael J. Wysocki 2011-02-08 23:38:25 +01:00
parent b7c1fadd6c
commit 13606a2de1
2 changed files with 18 additions and 0 deletions
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16
drivers/acpi/osl.c
View File

@ -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)

2
include/linux/acpi_io.h
View File

@ -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