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ARM: reintroduce ioremap_cached() for creating cached I/O mappings

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The original ARM-only ioremap flavor 'ioremap_cached' has been renamed
to 'ioremap_cache' to align with other architectures, and subsequently
abused in generic code to map things like firmware tables in memory.
For that reason, there is currently an effort underway to deprecate
ioremap_cache, whose semantics are poorly defined, and which is typed
with an __iomem annotation that is inappropriate for mappings of ordinary
memory.

However, original users of ioremap_cached() used it in a context where
the I/O connotation is appropriate, and replacing those instances with
memremap() does not make sense. So let's revive ioremap_cached(), so
that we can change back those original users before we drop ioremap_cache
entirely in favor of memremap.

Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Ard Biesheuvel 2016-03-04 10:05:39 +01:00
parent 9735a22799
commit 20c5ea4fc1
3 changed files with 14 additions and 0 deletions
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6
arch/arm/include/asm/io.h
View File

@ -395,6 +395,12 @@ void __iomem *ioremap(resource_size_t res_cookie, size_t size);
void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size);
#define ioremap_cache ioremap_cache
/*
* Do not use ioremap_cached in new code. Provided for the benefit of
* the pxa2xx-flash MTD driver only.
*/
void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size);
void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size);
#define ioremap_wc ioremap_wc
#define ioremap_wt ioremap_wc

4
arch/arm/mm/ioremap.c
View File

@ -380,11 +380,15 @@ void __iomem *ioremap(resource_size_t res_cookie, size_t size)
EXPORT_SYMBOL(ioremap);
void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size)
__alias(ioremap_cached);
void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size)
{
return arch_ioremap_caller(res_cookie, size, MT_DEVICE_CACHED,
__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_cache);
EXPORT_SYMBOL(ioremap_cached);
void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size)
{

4
arch/arm/mm/nommu.c
View File

@ -367,11 +367,15 @@ void __iomem *ioremap(resource_size_t res_cookie, size_t size)
EXPORT_SYMBOL(ioremap);
void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size)
__alias(ioremap_cached);
void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size)
{
return __arm_ioremap_caller(res_cookie, size, MT_DEVICE_CACHED,
__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_cache);
EXPORT_SYMBOL(ioremap_cached);
void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size)
{