[U-Boot] [PATCH v2 3/3] linux/io.h: add generic ioremap()/iounmap() defines

[Masahiro Yamada]

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 at 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 */
-- 
1.9.1