Re: [PATCH v1 08/10] powerpc/mm: move __ioremap_at() and __iounmap_at() into ioremap.c

diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c
index 57d742509cec..889ee656cf64 100644
--- a/arch/powerpc/mm/ioremap.c
+++ b/arch/powerpc/mm/ioremap.c

@@ -103,3 +103,46 @@ void iounmap(volatile void __iomem *token)
 	vunmap(addr);
 }
 EXPORT_SYMBOL(iounmap);
+
+#ifdef CONFIG_PPC64
+/**
+ * __ioremap_at - Low level function to establish the page tables
+ *                for an IO mapping
+ */
+void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_t prot)
+{
+	/* We don't support the 4K PFN hack with ioremap */
+	if (pgprot_val(prot) & H_PAGE_4K_PFN)
+		return NULL;
+
+	if ((ea + size) >= (void *)IOREMAP_END) {
+		pr_warn("Outside the supported range\n");
+		return NULL;
+	}
+
+	WARN_ON(pa & ~PAGE_MASK);
+	WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
+	WARN_ON(size & ~PAGE_MASK);
+
+	if (ioremap_range((unsigned long)ea, pa, size, prot, NUMA_NO_NODE))