[PATCH 9/11] ACPI: Introduce acpi_os_get_iomem()

Rafael J. Wysocki
2011-01-20T11:39:24Z

From: Rafael J. Wysocki <rjw@sisk.pl>

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>
---
drivers/acpi/osl.c | 16 ++++++++++++++++
include/linux/acpi_io.h | 2 ++
2 files changed, 18 insertions(+)

Index: linux-2.6/drivers/acpi/osl.c
===================================================================
--- linux-2.6.orig/drivers/acpi/osl.c
+++ linux-2.6/drivers/acpi/osl.c
@@ -285,6 +285,22 @@ acpi_map_vaddr_lookup(acpi_physical_addr
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)
Index: linux-2.6/include/linux/acpi_io.h
===================================================================
--- linux-2.6.orig/include/linux/acpi_io.h
+++ linux-2.6/include/linux/acpi_io.h
@@ -10,4 +10,6 @@ static inline void __iomem *acpi_os_iore
return ioremap_cache(phys, size);
}

+void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size);
+
#endif