sh: Limit ioremap_prot() to 32bit pgprot parts.

Presently ioremap_prot() uses an unsigned long to pass the pgprot value
around. This results in the upper half of the pgprot being chomped when
using 64-bit pgprots on a 32-bit ABI (X2TLB and SH-5).

As the only users of ioremap_prot() are presently legacy parts, this
doesn't cause too much of an issue. In the future when the interface is
converted to use pgprot_t directly this can be re-enabled for the other
parts, too.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -13,7 +13,6 @@ config SUPERH
 	select HAVE_LMB
 	select HAVE_OPROFILE
 	select HAVE_GENERIC_DMA_COHERENT
-	select HAVE_IOREMAP_PROT if MMU
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_DMA_API_DEBUG
 	select HAVE_DMA_ATTRS
@@ -36,6 +35,7 @@ config SUPERH32
 	def_bool ARCH = "sh"
 	select HAVE_KPROBES
 	select HAVE_KRETPROBES
+	select HAVE_IOREMAP_PROT if MMU && !X2TLB
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_DYNAMIC_FTRACE

arch/sh/include/asm/io.h

@@ -321,11 +321,13 @@ ioremap_cache(unsigned long offset, unsigned long size)
 	return __ioremap_mode(offset, size, PAGE_KERNEL);
 }
 
+#ifdef CONFIG_HAVE_IOREMAP_PROT
 static inline void __iomem *
 ioremap_prot(resource_size_t offset, unsigned long size, unsigned long flags)
 {
 	return __ioremap_mode(offset, size, __pgprot(flags));
 }
+#endif
 
 #define ioremap_nocache	ioremap
 #define iounmap		__iounmap