diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt
index 5e054bfe4dde..85e24c4f215c 100644
--- a/Documentation/arm64/memory.txt
+++ b/Documentation/arm64/memory.txt
@@ -35,11 +35,13 @@ ffffffbc00000000	ffffffbdffffffff	   8GB		vmemmap
 
 ffffffbe00000000	ffffffbffbbfffff	  ~8GB		[guard, future vmmemap]
 
+ffffffbffa000000	ffffffbffaffffff	  16MB		PCI I/O space
+
+ffffffbffb000000	ffffffbffbbfffff	  12MB		[guard]
+
 ffffffbffbc00000	ffffffbffbdfffff	   2MB		earlyprintk device
 
-ffffffbffbe00000	ffffffbffbe0ffff	  64KB		PCI I/O space
-
-ffffffbffbe10000	ffffffbcffffffff	  ~2MB		[guard]
+ffffffbffbe00000	ffffffbffbffffff	   2MB		[guard]
 
 ffffffbffc000000	ffffffbfffffffff	  64MB		modules
 
@@ -60,11 +62,13 @@ fffffdfc00000000	fffffdfdffffffff	   8GB		vmemmap
 
 fffffdfe00000000	fffffdfffbbfffff	  ~8GB		[guard, future vmmemap]
 
+fffffdfffa000000	fffffdfffaffffff	  16MB		PCI I/O space
+
+fffffdfffb000000	fffffdfffbbfffff	  12MB		[guard]
+
 fffffdfffbc00000	fffffdfffbdfffff	   2MB		earlyprintk device
 
-fffffdfffbe00000	fffffdfffbe0ffff	  64KB		PCI I/O space
-
-fffffdfffbe10000	fffffdfffbffffff	  ~2MB		[guard]
+fffffdfffbe00000	fffffdfffbffffff	   2MB		[guard]
 
 fffffdfffc000000	fffffdffffffffff	  64MB		modules
 
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 4cc813eddacb..7846a6bb0833 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -121,7 +121,7 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
  *  I/O port access primitives.
  */
 #define IO_SPACE_LIMIT		0xffff
-#define PCI_IOBASE		((void __iomem *)(MODULES_VADDR - SZ_2M))
+#define PCI_IOBASE		((void __iomem *)(MODULES_VADDR - SZ_32M))
 
 static inline u8 inb(unsigned long addr)
 {