MIPS: Support 36-bit iomem on 32-bit Au1x00

I believe these changes are needed on Alchemy SoCs in order to
use iomem above 4G with the usual platform_device machinery:

- Set CONFIG_ARCH_PHYS_ADDR_T_64BIT to make resource_size_t 64-bit.
- Increase IOMEM_RESOURCE_END so that platforms can register resources.

To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/814/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -1725,6 +1725,9 @@ config SB1_PASS_2_1_WORKAROUNDS
 config 64BIT_PHYS_ADDR
 	bool
 
+config ARCH_PHYS_ADDR_T_64BIT
+       def_bool 64BIT_PHYS_ADDR
+
 config CPU_HAS_SMARTMIPS
 	depends on SYS_SUPPORTS_SMARTMIPS
 	bool "Support for the SmartMIPS ASE"

arch/mips/include/asm/mach-au1x00/au1000.h

@@ -1659,7 +1659,7 @@ enum soc_au1200_ints {
 #define IOPORT_RESOURCE_START	0x00001000	/* skip legacy probing */
 #define IOPORT_RESOURCE_END	0xffffffff
 #define IOMEM_RESOURCE_START	0x10000000
-#define IOMEM_RESOURCE_END	0xffffffff
+#define IOMEM_RESOURCE_END	0xfffffffffULL
 
 #else /* Au1000 and Au1100 and Au1200 */
 
@@ -1667,7 +1667,7 @@ enum soc_au1200_ints {
 #define IOPORT_RESOURCE_START	0x10000000
 #define IOPORT_RESOURCE_END	0xffffffff
 #define IOMEM_RESOURCE_START	0x10000000
-#define IOMEM_RESOURCE_END	0xffffffff
+#define IOMEM_RESOURCE_END	0xfffffffffULL
 
 #define PCI_IO_START	0
 #define PCI_IO_END	0