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linux/io.h: add generic ioremap()/iounmap() defines

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For most of architectures in U-Boot, virtual address is straight
mapped to physical address.  So, it makes sense to have generic
defines of ioremap and friends in <linux/io.h>.

All of them are just empty and will disappear at compile time, but
they will be helpful to implement drivers which are counterparts of
Linux ones.

I notice MIPS already has its own implementation, so I added a
Kconfig symbol CONFIG_HAVE_ARCH_IOREMAP which MIPS (and maybe
Sandbox as well) can select.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
This commit is contained in:
Masahiro Yamada 2016-06-28 10:48:42 +09:00 • committed by Tom Rini
parent c74b8fcdd7
commit 9a387128e3
2 changed files with 20 additions and 0 deletions
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4
arch/Kconfig
View file

@ -1,6 +1,9 @@
config CREATE_ARCH_SYMLINK config CREATE_ARCH_SYMLINK
bool bool
config HAVE_ARCH_IOREMAP
bool
choice choice
prompt "Architecture select" prompt "Architecture select"
default SANDBOX default SANDBOX
@ -33,6 +36,7 @@ config MICROBLAZE
config MIPS config MIPS
bool "MIPS architecture" bool "MIPS architecture"
select HAVE_ARCH_IOREMAP
select HAVE_PRIVATE_LIBGCC select HAVE_PRIVATE_LIBGCC
select SUPPORT_OF_CONTROL select SUPPORT_OF_CONTROL

16
include/linux/io.h
View file

@ -5,6 +5,22 @@
#ifndef _LINUX_IO_H #ifndef _LINUX_IO_H
#define _LINUX_IO_H #define _LINUX_IO_H
#include <linux/compiler.h>
#include <linux/types.h>
#include <asm/io.h> #include <asm/io.h>
#ifndef CONFIG_HAVE_ARCH_IOREMAP
static inline void __iomem *ioremap(resource_size_t offset,
resource_size_t size)
{
return (void __iomem *)(unsigned long)offset;
}
static inline void iounmap(void __iomem *addr)
{
}
#define devm_ioremap(dev, offset, size) ioremap(offset, size)
#endif
#endif /* _LINUX_IO_H */ #endif /* _LINUX_IO_H */