ARM: make mach/io.h include optional

Add a kconfig option NEED_MACH_IO_H to conditionally include mach/io.h.

Basing this on CONFIG_PCI and CONFIG_ISA doesn't quite work. Most ISA
platforms don't need mach/io.h, but ebsa110 does. Most PCI platforms need
mach/io.h for now, but ks8695 doesn't which means i/o accesses are broken.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Nicolas Pitre <nico@linaro.org>

arch/arm/Kconfig

@@ -217,6 +217,13 @@ config ARM_PATCH_PHYS_VIRT
 	  this feature (eg, building a kernel for a single machine) and
 	  you need to shrink the kernel to the minimal size.
 
+config NEED_MACH_IO_H
+	bool
+	help
+	  Select this when mach/io.h is required to provide special
+	  definitions for this platform.  The need for mach/io.h should
+	  be avoided when possible.
+
 config NEED_MACH_MEMORY_H
 	bool
 	help
@@ -268,6 +275,7 @@ config ARCH_INTEGRATOR
 	select GENERIC_CLOCKEVENTS
 	select PLAT_VERSATILE
 	select PLAT_VERSATILE_FPGA_IRQ
+	select NEED_MACH_IO_H
 	select NEED_MACH_MEMORY_H
 	help
 	  Support for ARM's Integrator platform.
@@ -403,6 +411,7 @@ config ARCH_EBSA110
 	select ISA
 	select NO_IOPORT
 	select ARCH_USES_GETTIMEOFFSET
+	select NEED_MACH_IO_H
 	select NEED_MACH_MEMORY_H
 	help
 	  This is an evaluation board for the StrongARM processor available
@@ -429,6 +438,7 @@ config ARCH_FOOTBRIDGE
 	select FOOTBRIDGE
 	select GENERIC_CLOCKEVENTS
 	select HAVE_IDE
+	select NEED_MACH_IO_H
 	select NEED_MACH_MEMORY_H
 	help
 	  Support for systems based on the DC21285 companion chip
@@ -481,6 +491,7 @@ config ARCH_IOP13XX
 	select PCI
 	select ARCH_SUPPORTS_MSI
 	select VMSPLIT_1G
+	select NEED_MACH_IO_H
 	select NEED_MACH_MEMORY_H
 	select NEED_RET_TO_USER
 	help
@@ -490,6 +501,7 @@ config ARCH_IOP32X
 	bool "IOP32x-based"
 	depends on MMU
 	select CPU_XSCALE
+	select NEED_MACH_IO_H
 	select NEED_RET_TO_USER
 	select PLAT_IOP
 	select PCI
@@ -502,6 +514,7 @@ config ARCH_IOP33X
 	bool "IOP33x-based"
 	depends on MMU
 	select CPU_XSCALE
+	select NEED_MACH_IO_H
 	select NEED_RET_TO_USER
 	select PLAT_IOP
 	select PCI
@@ -515,6 +528,7 @@ config ARCH_IXP23XX
 	select CPU_XSC3
  	select PCI
 	select ARCH_USES_GETTIMEOFFSET
+	select NEED_MACH_IO_H
 	select NEED_MACH_MEMORY_H
 	help
 	  Support for Intel's IXP23xx (XScale) family of processors.
@@ -525,6 +539,7 @@ config ARCH_IXP2000
 	select CPU_XSCALE
 	select PCI
 	select ARCH_USES_GETTIMEOFFSET
+	select NEED_MACH_IO_H
 	select NEED_MACH_MEMORY_H
 	help
 	  Support for Intel's IXP2400/2800 (XScale) family of processors.
@@ -538,6 +553,7 @@ config ARCH_IXP4XX
 	select GENERIC_CLOCKEVENTS
 	select HAVE_SCHED_CLOCK
 	select MIGHT_HAVE_PCI
+	select NEED_MACH_IO_H
 	select DMABOUNCE if PCI
 	help
 	  Support for Intel's IXP4XX (XScale) family of processors.
@@ -548,6 +564,7 @@ config ARCH_DOVE
 	select PCI
 	select ARCH_REQUIRE_GPIOLIB
 	select GENERIC_CLOCKEVENTS
+	select NEED_MACH_IO_H
 	select PLAT_ORION
 	help
 	  Support for the Marvell Dove SoC 88AP510
@@ -558,6 +575,7 @@ config ARCH_KIRKWOOD
 	select PCI
 	select ARCH_REQUIRE_GPIOLIB
 	select GENERIC_CLOCKEVENTS
+	select NEED_MACH_IO_H
 	select PLAT_ORION
 	help
 	  Support for the following Marvell Kirkwood series SoCs:
@@ -582,6 +600,7 @@ config ARCH_MV78XX0
 	select PCI
 	select ARCH_REQUIRE_GPIOLIB
 	select GENERIC_CLOCKEVENTS
+	select NEED_MACH_IO_H
 	select PLAT_ORION
 	help
 	  Support for the following Marvell MV78xx0 series SoCs:
@@ -651,6 +670,7 @@ config ARCH_TEGRA
 	select HAVE_SCHED_CLOCK
 	select HAVE_SMP
 	select MIGHT_HAVE_CACHE_L2X0
+	select NEED_MACH_IO_H if PCI
 	select ARCH_HAS_CPUFREQ
 	help
 	  This enables support for NVIDIA Tegra based systems (Tegra APX,
@@ -745,6 +765,7 @@ config ARCH_RPC
 	select ARCH_SPARSEMEM_ENABLE
 	select ARCH_USES_GETTIMEOFFSET
 	select HAVE_IDE
+	select NEED_MACH_IO_H
 	select NEED_MACH_MEMORY_H
 	help
 	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
@@ -777,6 +798,7 @@ config ARCH_S3C2410
 	select CLKDEV_LOOKUP
 	select ARCH_USES_GETTIMEOFFSET
 	select HAVE_S3C2410_I2C if I2C
+	select NEED_MACH_IO_H
 	help
 	  Samsung S3C2410X CPU based systems, such as the Simtec Electronics
 	  BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
@@ -883,6 +905,7 @@ config ARCH_SHARK
 	select PCI
 	select ARCH_USES_GETTIMEOFFSET
 	select NEED_MACH_MEMORY_H
+	select NEED_MACH_IO_H
 	help
 	  Support for the StrongARM based Digital DNARD machine, also known
 	  as "Shark" (<http://www.shark-linux.de/shark.html>).

arch/arm/include/asm/io.h

@@ -114,7 +114,12 @@ static inline void __iomem *__typesafe_io(unsigned long addr)
 /*
  * Now, pick up the machine-defined IO definitions
  */
+#ifdef CONFIG_NEED_MACH_IO_H
 #include <mach/io.h>
+#else
+#define __io(a)		({ (void)(a); __typesafe_io(0); })
+#define __mem_pci(a)	(a)
+#endif
 
 /*
  * This is the limit of PC card/PCI/ISA IO space, which is by default