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ARM: provide runtime hook for ioremap/iounmap 

We have compile time over-ride of ioremap and iounmap, but an run-time
override is needed for multi-platform builds. This adds an extra function
pointer check, but ioremap is not peformance critical. The option for
compile time selection remains.

The caller variant is used here to provide correct caller information as
ARM can only support level 0 for __builtin_return_address.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nicolas Pitre <nico@linaro.org>
This commit is contained in:
Rob Herring 2012-02-10 17:05:13 -06:00
parent 47168824fa
commit 4fe7ef3a08
2 changed files with 20 additions and 4 deletions
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7
arch/arm/include/asm/io.h
View File

@ -83,6 +83,11 @@ extern void __iomem *__arm_ioremap_pfn(unsigned long, unsigned long, size_t, uns
extern void __iomem *__arm_ioremap(unsigned long, size_t, unsigned int);
extern void __iomem *__arm_ioremap_exec(unsigned long, size_t, bool cached);
extern void __iounmap(volatile void __iomem *addr);
extern void __arm_iounmap(volatile void __iomem *addr);
extern void __iomem * (*arch_ioremap_caller)(unsigned long, size_t,
unsigned int, void *);
extern void (*arch_iounmap)(volatile void __iomem *);
/*
* Bad read/write accesses...
@ -266,7 +271,7 @@ extern void _memset_io(volatile void __iomem *, int, size_t);
*/
#ifndef __arch_ioremap
#define __arch_ioremap __arm_ioremap
#define __arch_iounmap __iounmap
#define __arch_iounmap __arm_iounmap
#endif
#define ioremap(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE)

17
arch/arm/mm/ioremap.c
View File

@ -306,11 +306,15 @@ __arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
}
EXPORT_SYMBOL(__arm_ioremap_pfn);
void __iomem * (*arch_ioremap_caller)(unsigned long, size_t,
unsigned int, void *) =
__arm_ioremap_caller;
void __iomem *
__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
{
return __arm_ioremap_caller(phys_addr, size, mtype,
__builtin_return_address(0));
return arch_ioremap_caller(phys_addr, size, mtype,
__builtin_return_address(0));
}
EXPORT_SYMBOL(__arm_ioremap);
@ -369,4 +373,11 @@ void __iounmap(volatile void __iomem *io_addr)
vunmap(addr);
}
EXPORT_SYMBOL(__iounmap);
void (*arch_iounmap)(volatile void __iomem *) = __iounmap;
void __arm_iounmap(volatile void __iomem *io_addr)
{
arch_iounmap(io_addr);
}
EXPORT_SYMBOL(__arm_iounmap);