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 ---
Changes in v2: - Use #ifndef CONFIG_HAVE_ARCH_IOREMAP instead of #ifndef CONFIG_MIPS
arch/Kconfig | 4 ++++ include/linux/io.h | 16 ++++++++++++++++ 2 files changed, 20 insertions(+)
diff --git a/arch/Kconfig b/arch/Kconfig index 566f044..8090a45 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -1,6 +1,9 @@ config CREATE_ARCH_SYMLINK bool
+config HAVE_ARCH_IOREMAP + bool + choice prompt "Architecture select" default SANDBOX @@ -33,6 +36,7 @@ config MICROBLAZE
config MIPS bool "MIPS architecture" + select HAVE_ARCH_IOREMAP select HAVE_PRIVATE_LIBGCC select SUPPORT_OF_CONTROL
diff --git a/include/linux/io.h b/include/linux/io.h index 1b36a22..a104b7e 100644 --- a/include/linux/io.h +++ b/include/linux/io.h @@ -5,6 +5,22 @@ #ifndef _LINUX_IO_H #define _LINUX_IO_H
+#include <linux/compiler.h> +#include <linux/types.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 */