X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=lib%2Fiommu-helper.c;h=75dbda03f4fb99a92ef8cc3ead817afefd707702;hb=0552f297951d0ab3a1027f9b06fa40c9be8378ba;hp=5d90074dca7550f4935e71127911441c9bc617e2;hpb=6dc6472581f693b5fc95aebedf67b4960fb85cf0;p=karo-tx-linux.git

diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
index 5d90074dca75..75dbda03f4fb 100644
--- a/lib/iommu-helper.c
+++ b/lib/iommu-helper.c
@@ -79,3 +79,12 @@ void iommu_area_free(unsigned long *map, unsigned long start, unsigned int nr)
 	}
 }
 EXPORT_SYMBOL(iommu_area_free);
+
+unsigned long iommu_num_pages(unsigned long addr, unsigned long len,
+			      unsigned long io_page_size)
+{
+	unsigned long size = (addr & (io_page_size - 1)) + len;
+
+	return DIV_ROUND_UP(size, io_page_size);
+}
+EXPORT_SYMBOL(iommu_num_pages);