[ARM] nommu: add stubs for ioremap and friends

nommu doesn't have any form of remapping support, so ioremap, etc
become stubs which just return the casted address, doing nothing
else.

Move ioport_map(), ioport_unmap(), pci_iomap(), pci_iounmap()
into a separate file which is always built.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/Makefile

@@ -3,9 +3,15 @@
 #
 
 obj-y				:= consistent.o extable.o fault-armv.o \
-				   fault.o flush.o init.o ioremap.o mmap.o \
+				   fault.o flush.o init.o iomap.o mmap.o \
 				   mm-armv.o
 
+obj-$(CONFIG_MMU)		+= ioremap.o
+
+ifneq ($(CONFIG_MMU),y)
+obj-y				+= nommu.o
+endif
+
 obj-$(CONFIG_MODULES)		+= proc-syms.o
 
 obj-$(CONFIG_ALIGNMENT_TRAP)	+= alignment.o

arch/arm/mm/iomap.c

@@ -0,0 +1,55 @@
+/*
+ *  linux/arch/arm/mm/iomap.c
+ *
+ * Map IO port and PCI memory spaces so that {read,write}[bwl] can
+ * be used to access this memory.
+ */
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+
+#include <asm/io.h>
+
+#ifdef __io
+void __iomem *ioport_map(unsigned long port, unsigned int nr)
+{
+	return __io(port);
+}
+EXPORT_SYMBOL(ioport_map);
+
+void ioport_unmap(void __iomem *addr)
+{
+}
+EXPORT_SYMBOL(ioport_unmap);
+#endif
+
+#ifdef CONFIG_PCI
+void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+	unsigned long start = pci_resource_start(dev, bar);
+	unsigned long len   = pci_resource_len(dev, bar);
+	unsigned long flags = pci_resource_flags(dev, bar);
+
+	if (!len || !start)
+		return NULL;
+	if (maxlen && len > maxlen)
+		len = maxlen;
+	if (flags & IORESOURCE_IO)
+		return ioport_map(start, len);
+	if (flags & IORESOURCE_MEM) {
+		if (flags & IORESOURCE_CACHEABLE)
+			return ioremap(start, len);
+		return ioremap_nocache(start, len);
+	}
+	return NULL;
+}
+EXPORT_SYMBOL(pci_iomap);
+
+void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
+{
+	if ((unsigned long)addr >= VMALLOC_START &&
+	    (unsigned long)addr < VMALLOC_END)
+		iounmap(addr);
+}
+EXPORT_SYMBOL(pci_iounmap);
+#endif

arch/arm/mm/ioremap.c

@@ -176,50 +176,3 @@ void __iounmap(void __iomem *addr)
 	vunmap((void *)(PAGE_MASK & (unsigned long)addr));
 }
 EXPORT_SYMBOL(__iounmap);
-
-#ifdef __io
-void __iomem *ioport_map(unsigned long port, unsigned int nr)
-{
-	return __io(port);
-}
-EXPORT_SYMBOL(ioport_map);
-
-void ioport_unmap(void __iomem *addr)
-{
-}
-EXPORT_SYMBOL(ioport_unmap);
-#endif
-
-#ifdef CONFIG_PCI
-#include <linux/pci.h>
-#include <linux/ioport.h>
-
-void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
-{
-	unsigned long start = pci_resource_start(dev, bar);
-	unsigned long len   = pci_resource_len(dev, bar);
-	unsigned long flags = pci_resource_flags(dev, bar);
-
-	if (!len || !start)
-		return NULL;
-	if (maxlen && len > maxlen)
-		len = maxlen;
-	if (flags & IORESOURCE_IO)
-		return ioport_map(start, len);
-	if (flags & IORESOURCE_MEM) {
-		if (flags & IORESOURCE_CACHEABLE)
-			return ioremap(start, len);
-		return ioremap_nocache(start, len);
-	}
-	return NULL;
-}
-EXPORT_SYMBOL(pci_iomap);
-
-void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
-{
-	if ((unsigned long)addr >= VMALLOC_START &&
-	    (unsigned long)addr < VMALLOC_END)
-		iounmap(addr);
-}
-EXPORT_SYMBOL(pci_iounmap);
-#endif

arch/arm/mm/nommu.c

@@ -0,0 +1,30 @@
+/*
+ *  linux/arch/arm/mm/nommu.c
+ *
+ * ARM uCLinux supporting functions.
+ */
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <asm/page.h>
+
+void __iomem *__ioremap_pfn(unsigned long pfn, unsigned long offset,
+			    size_t size, unsigned long flags)
+{
+	if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
+		return NULL;
+	return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
+}
+EXPORT_SYMBOL(__ioremap_pfn);
+
+void __iomem *__ioremap(unsigned long phys_addr, size_t size,
+			unsigned long flags)
+{
+	return (void __iomem *)phys_addr;
+}
+EXPORT_SYMBOL(__ioremap);
+
+void __iounmap(void __iomem *addr)
+{
+}
+EXPORT_SYMBOL(__iounmap);