diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 949c406d4df43..540f7c0aea825 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -26,6 +26,7 @@
 
 #include <asm/byteorder.h>
 #include <asm/barrier.h>
+#include <asm/memory.h>
 #include <asm/pgtable.h>
 #include <asm/early_ioremap.h>
 #include <asm/alternative.h>
@@ -145,8 +146,8 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
  *  I/O port access primitives.
  */
 #define arch_has_dev_port()	(1)
-#define IO_SPACE_LIMIT		(SZ_32M - 1)
-#define PCI_IOBASE		((void __iomem *)(MODULES_VADDR - SZ_32M))
+#define IO_SPACE_LIMIT		(PCI_IO_SIZE - 1)
+#define PCI_IOBASE		((void __iomem *)PCI_IO_START)
 
 /*
  * String version of I/O memory access operations.
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 6486b2bfd5626..f800d45ea2265 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -32,6 +32,12 @@
  */
 #define UL(x) _AC(x, UL)
 
+/*
+ * Size of the PCI I/O space. This must remain a power of two so that
+ * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
+ */
+#define PCI_IO_SIZE		SZ_16M
+
 /*
  * PAGE_OFFSET - the virtual address of the start of the kernel image (top
  *		 (VA_BITS - 1))
@@ -45,7 +51,9 @@
 #define PAGE_OFFSET		(UL(0xffffffffffffffff) << (VA_BITS - 1))
 #define MODULES_END		(PAGE_OFFSET)
 #define MODULES_VADDR		(MODULES_END - SZ_64M)
-#define FIXADDR_TOP		(MODULES_VADDR - SZ_2M - PAGE_SIZE)
+#define PCI_IO_END		(MODULES_VADDR - SZ_2M)
+#define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)
+#define FIXADDR_TOP		(PCI_IO_START - SZ_2M)
 #define TASK_SIZE_64		(UL(1) << VA_BITS)
 
 #ifdef CONFIG_COMPAT
diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
index cf33f33333ccd..77d39a1b6f8d4 100644
--- a/arch/arm64/mm/dump.c
+++ b/arch/arm64/mm/dump.c
@@ -36,10 +36,10 @@ enum address_markers_idx {
 	VMEMMAP_START_NR,
 	VMEMMAP_END_NR,
 #endif
-	PCI_START_NR,
-	PCI_END_NR,
 	FIXADDR_START_NR,
 	FIXADDR_END_NR,
+	PCI_START_NR,
+	PCI_END_NR,
 	MODULES_START_NR,
 	MODUELS_END_NR,
 	KERNEL_SPACE_NR,
@@ -52,10 +52,10 @@ static struct addr_marker address_markers[] = {
 	{ 0,			"vmemmap start" },
 	{ 0,			"vmemmap end" },
 #endif
-	{ (unsigned long) PCI_IOBASE,		"PCI I/O start" },
-	{ (unsigned long) PCI_IOBASE + SZ_16M,	"PCI I/O end" },
 	{ FIXADDR_START,	"Fixmap start" },
 	{ FIXADDR_TOP,		"Fixmap end" },
+	{ PCI_IO_START,		"PCI I/O start" },
+	{ PCI_IO_END,		"PCI I/O end" },
 	{ MODULES_VADDR,	"Modules start" },
 	{ MODULES_END,		"Modules end" },
 	{ PAGE_OFFSET,		"Kernel Mapping" },
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 43cccb5101c02..a8dfb40eefa82 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -35,6 +35,7 @@
 #include <linux/efi.h>
 
 #include <asm/fixmap.h>
+#include <asm/memory.h>
 #include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/sizes.h>
@@ -296,8 +297,8 @@ void __init mem_init(void)
 		  "    vmemmap : 0x%16lx - 0x%16lx   (%6ld GB maximum)\n"
 		  "              0x%16lx - 0x%16lx   (%6ld MB actual)\n"
 #endif
-		  "    PCI I/O : 0x%16lx - 0x%16lx   (%6ld MB)\n"
 		  "    fixed   : 0x%16lx - 0x%16lx   (%6ld KB)\n"
+		  "    PCI I/O : 0x%16lx - 0x%16lx   (%6ld MB)\n"
 		  "    modules : 0x%16lx - 0x%16lx   (%6ld MB)\n"
 		  "    memory  : 0x%16lx - 0x%16lx   (%6ld MB)\n"
 		  "      .init : 0x%p" " - 0x%p" "   (%6ld KB)\n"
@@ -310,8 +311,8 @@ void __init mem_init(void)
 		  MLM((unsigned long)virt_to_page(PAGE_OFFSET),
 		      (unsigned long)virt_to_page(high_memory)),
 #endif
-		  MLM((unsigned long)PCI_IOBASE, (unsigned long)PCI_IOBASE + SZ_16M),
 		  MLK(FIXADDR_START, FIXADDR_TOP),
+		  MLM(PCI_IO_START, PCI_IO_END),
 		  MLM(MODULES_VADDR, MODULES_END),
 		  MLM(PAGE_OFFSET, (unsigned long)high_memory),
 		  MLK_ROUNDUP(__init_begin, __init_end),