3 files changed, 45 insertions, 1 deletions
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index ecabc00c1e66..0cbf3af37eca 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -632,4 +632,6 @@ extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
  */
 #define xlate_dev_kmem_ptr(p)	p
 
+void __ioread64_copy(void *to, const void __iomem *from, size_t count);
+
 #endif /* _ASM_IO_H */
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index a37fe3d1ee2f..6ab430d24575 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -6,7 +6,7 @@ lib-y	+= bitops.o csum_partial.o delay.o memcpy.o memset.o \
 	   mips-atomic.o strncpy_user.o \
 	   strnlen_user.o uncached.o
 
-obj-y			+= iomap.o
+obj-y			+= iomap.o iomap_copy.o
 obj-$(CONFIG_PCI)	+= iomap-pci.o
 lib-$(CONFIG_GENERIC_CSUM)	:= $(filter-out csum_partial.o, $(lib-y))
 
diff --git a/arch/mips/lib/iomap_copy.c b/arch/mips/lib/iomap_copy.c
new file mode 100644
index 000000000000..368bb38267c5
--- /dev/null
+++ b/arch/mips/lib/iomap_copy.c
@@ -0,0 +1,42 @@
+/*
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/export.h>
+#include <linux/io.h>
+
+/**
+ * __ioread64_copy - copy data from MMIO space, in 64-bit units
+ * @to: destination (must be 64-bit aligned)
+ * @from: source, in MMIO space (must be 64-bit aligned)
+ * @count: number of 64-bit quantities to copy
+ *
+ * Copy data from MMIO space to kernel space, in units of 32 or 64 bits at a
+ * time.  Order of access is not guaranteed, nor is a memory barrier
+ * performed afterwards.
+ */
+void __ioread64_copy(void *to, const void __iomem *from, size_t count)
+{
+#ifdef CONFIG_64BIT
+	u64 *dst = to;
+	const u64 __iomem *src = from;
+	const u64 __iomem *end = src + count;
+
+	while (src < end)
+		*dst++ = __raw_readq(src++);
+#else
+	__ioread32_copy(to, from, count * 2);
+#endif
+}
+EXPORT_SYMBOL_GPL(__ioread64_copy);