linux/io.h: add generic ioremap()/iounmap() defines
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>
diff --git a/arch/Kconfig b/arch/Kconfig
index c43787c..92d4b97 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 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 */