diff --git a/drivers/infiniband/hw/ipath/Makefile b/drivers/infiniband/hw/ipath/Makefile
index 6bb43474d104..075e313941fe 100644
--- a/drivers/infiniband/hw/ipath/Makefile
+++ b/drivers/infiniband/hw/ipath/Makefile
@@ -20,6 +20,7 @@ ipath_core-y := \
 	ipath_user_pages.o
 
 ipath_core-$(CONFIG_X86_64) += ipath_wc_x86_64.o
+ipath_core-$(CONFIG_PPC64) += ipath_wc_ppc64.o
 
 ib_ipath-y := \
 	ipath_cq.o \
diff --git a/drivers/infiniband/hw/ipath/ipath_driver.c b/drivers/infiniband/hw/ipath/ipath_driver.c
index f98518d912b5..6ded914f9eb9 100644
--- a/drivers/infiniband/hw/ipath/ipath_driver.c
+++ b/drivers/infiniband/hw/ipath/ipath_driver.c
@@ -440,7 +440,13 @@ static int __devinit ipath_init_one(struct pci_dev *pdev,
 	}
 	dd->ipath_pcirev = rev;
 
+#if defined(__powerpc__)
+	/* There isn't a generic way to specify writethrough mappings */
+	dd->ipath_kregbase = __ioremap(addr, len,
+		(_PAGE_NO_CACHE|_PAGE_WRITETHRU));
+#else
 	dd->ipath_kregbase = ioremap_nocache(addr, len);
+#endif
 
 	if (!dd->ipath_kregbase) {
 		ipath_dbg("Unable to map io addr %llx to kvirt, failing\n",
diff --git a/drivers/infiniband/hw/ipath/ipath_file_ops.c b/drivers/infiniband/hw/ipath/ipath_file_ops.c
index bbaa70e57db1..0b6e7679eefd 100644
--- a/drivers/infiniband/hw/ipath/ipath_file_ops.c
+++ b/drivers/infiniband/hw/ipath/ipath_file_ops.c
@@ -985,6 +985,13 @@ static int mmap_piobufs(struct vm_area_struct *vma,
 	 * write combining behavior we want on the PIO buffers!
 	 */
 
+#if defined(__powerpc__)
+	/* There isn't a generic way to specify writethrough mappings */
+	pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
+	pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
+	pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
+#endif
+
 	if (vma->vm_flags & VM_READ) {
 		dev_info(&dd->pcidev->dev,
 			 "Can't map piobufs as readable (flags=%lx)\n",
diff --git a/drivers/infiniband/hw/ipath/ipath_wc_ppc64.c b/drivers/infiniband/hw/ipath/ipath_wc_ppc64.c
new file mode 100644
index 000000000000..036fde662aa9
--- /dev/null
+++ b/drivers/infiniband/hw/ipath/ipath_wc_ppc64.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2006 QLogic, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * This file is conditionally built on PowerPC only.  Otherwise weak symbol
+ * versions of the functions exported from here are used.
+ */
+
+#include "ipath_kernel.h"
+
+/**
+ * ipath_unordered_wc - indicate whether write combining is ordered
+ *
+ * PowerPC systems (at least those in the 970 processor family)
+ * write partially filled store buffers in address order, but will write
+ * completely filled store buffers in "random" order, and therefore must
+ * have serialization for correctness with current InfiniPath chips.
+ *
+ */
+int ipath_unordered_wc(void)
+{
+	return 1;
+}