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sh: Add fixed ioremap support

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Some devices need to be ioremap'd and accessed very early in the boot
process. It is not possible to use the standard ioremap() function in
this case because that requires kmalloc()'ing some virtual address space
and kmalloc() may not be available so early in boot.

This patch provides fixmap mappings that allow physical address ranges
to be remapped into the kernel address space during the early boot
stages.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
This commit is contained in:
Matt Fleming
2009-11-05 07:54:17 +00:00
parent 07cad4dc1b
commit 4d35b93a66
6 changed files with 167 additions and 3 deletions
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6
arch/sh/include/asm/io.h
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@@ -237,6 +237,12 @@ void __iomem *__ioremap_caller(unsigned long offset, unsigned long size,
unsigned long flags, void *caller);
void __iounmap(void __iomem *addr);
#ifdef CONFIG_IOREMAP_FIXED
extern void __iomem *ioremap_fixed(resource_size_t, unsigned long, pgprot_t);
extern void iounmap_fixed(void __iomem *);
extern void ioremap_fixed_init(void);
#endif
static inline void __iomem *
__ioremap(unsigned long offset, unsigned long size, unsigned long flags)
{