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sh: Handle early ioremaps through fixed mappings.

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This adds in a mem_init_done to work out when a standard ioremap() is
possible, falling back to the fixmap based ioremap otherwise.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-01-18 21:08:32 +09:00
parent 0c54de146e
commit d9b9487af7
3 changed files with 16 additions and 3 deletions
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3
arch/sh/include/asm/processor.h
View File

@ -101,6 +101,9 @@ struct seq_operations;
extern struct pt_regs fake_swapper_regs;
/* arch/sh/mm/init.c */
extern unsigned int mem_init_done;
/* arch/sh/kernel/setup.c */
const char *get_cpu_subtype(struct sh_cpuinfo *c);
extern const struct seq_operations cpuinfo_op;

4
arch/sh/mm/init.c
View File

@ -237,6 +237,8 @@ static void __init iommu_init(void)
no_iommu_init();
}
unsigned int mem_init_done = 0;
void __init mem_init(void)
{
int codesize, datasize, initsize;
@ -287,6 +289,8 @@ void __init mem_init(void)
/* Initialize the vDSO */
vsyscall_init();
mem_init_done = 1;
}
void free_initmem(void)

12
arch/sh/mm/ioremap_32.c
View File

@ -1,13 +1,13 @@
/*
* arch/sh/mm/ioremap.c
*
* (C) Copyright 1995 1996 Linus Torvalds
* (C) Copyright 2005 - 2010 Paul Mundt
*
* Re-map IO memory to kernel address space so that we can access it.
* This is needed for high PCI addresses that aren't mapped in the
* 640k-1MB IO memory area on PC's
*
* (C) Copyright 1995 1996 Linus Torvalds
* (C) Copyright 2005, 2006 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file "COPYING" in the main directory of this
* archive for more details.
@ -64,6 +64,12 @@ void __iomem *__ioremap_caller(unsigned long phys_addr, unsigned long size,
phys_addr &= PAGE_MASK;
size = PAGE_ALIGN(last_addr+1) - phys_addr;
/*
* If we can't yet use the regular approach, go the fixmap route.
*/
if (!mem_init_done)
return ioremap_fixed(phys_addr, size, __pgprot(flags));
/*
* Ok, go for it..
*/