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[ARM] 3070/2: Add __ioremap_pfn() API

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Patch from Deepak Saxena

In working on adding 36-bit addressed supersection support to ioremap(),
I came to the conclusion that it would be far simpler to do so by just
splitting __ioremap() into a main external interface and adding an
__ioremap_pfn() function that takes a pfn + offset into the page that
__ioremap() can call. This way existing callers of __ioremap() won't have
to change their code and 36-bit systems will just call __ioremap_pfn()
and we will not have to deal with unsigned long long variables.

Note that __ioremap_pfn() should _NOT_ be called directly by drivers
but is reserved for use by arch_ioremap() implementations that map
32-bit resource regions into the real 36-bit address and then call
this new function.

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Deepak Saxena
2006-01-09 19:23:11 +00:00
committed by Russell King
parent 16ed926eee
commit 9d4ae7276a
4 changed files with 41 additions and 23 deletions
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6
include/asm-arm/io.h
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@@ -56,7 +56,12 @@ extern void __raw_readsl(const void __iomem *addr, void *data, int longlen);
/*
* Architecture ioremap implementation.
*
* __ioremap takes CPU physical address.
*
* __ioremap_pfn takes a Page Frame Number and an offset into that page
*/
extern void __iomem * __ioremap_pfn(unsigned long, unsigned long, size_t, unsigned long);
extern void __iomem * __ioremap(unsigned long, size_t, unsigned long);
extern void __iounmap(void __iomem *addr);
@@ -261,6 +266,7 @@ out:
*
* ioremap takes a PCI memory address, as specified in
* Documentation/IO-mapping.txt.
*
*/
#ifndef __arch_ioremap
#define ioremap(cookie,size) __ioremap(cookie,size,0)