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[ARM] nommu: add stubs for ioremap and friends

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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>
This commit is contained in:
Russell King 2006-06-22 15:05:36 +01:00 committed by Russell King
parent f9c21a6ee7
commit 5924486dc0
4 changed files with 92 additions and 48 deletions
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8
arch/arm/mm/Makefile
View File

@ -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

55
arch/arm/mm/iomap.c Normal file
View File

@ -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

47
arch/arm/mm/ioremap.c
View File

@ -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

30
arch/arm/mm/nommu.c Normal file
View File

@ -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);