ARM: 7130/1: dev_archdata: add private iommu extension

Add a private iommu pointer to the ARM-specific arch data in the
device struct, which will be used to attach iommu-specific data
to devices which require iommu support.

Different iommu implementations (on different platforms) will attach
different types of data to this pointer, so 'void *' is currently used
(the downside is reduced typesafety).

Note: ia64, x86 and sparc have this exact iommu extension as well, and
if others are likely to adopt it too, we might want to consider
adding this to the device struct itself directly.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/include/asm/device.h b/arch/arm/include/asm/device.h
index 9f390ce335cb00743cb6cd717819f0750b63b0db..6615f03f56a551c7baf2251d4d0633aa61ff0a9d 100644 (file)
--- a/arch/arm/include/asm/device.h
+++ b/arch/arm/include/asm/device.h
@@ -10,6 +10,9 @@ struct dev_archdata {
 #ifdef CONFIG_DMABOUNCE
        struct dmabounce_device_info *dmabounce;
 #endif
+#ifdef CONFIG_IOMMU_API
+       void *iommu; /* private IOMMU data */
+#endif
 };
 
 struct pdev_archdata {