linux/io.h: import generic ioread* / iowrite* accessors from Linux

Some drivers in Linux (ex. drivers/mtd/nand/denali.c) use
ioread*/iowrite* accessors.  Import them to make drivers more
synced.  I copied code from include/asm-generic/io.h of Linux.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

diff --git a/include/linux/io.h b/include/linux/io.h
index a104b7e69f7c871d267f7a541683b831aed3a071..bf1ddbbaa671677fb104eea282b1e7edc9d2330b 100644 (file)
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -9,6 +9,50 @@
 #include <linux/types.h>
 #include <asm/io.h>
 
+static inline u8 ioread8(const volatile void __iomem *addr)
+{
+       return readb(addr);
+}
+
+static inline u16 ioread16(const volatile void __iomem *addr)
+{
+       return readw(addr);
+}
+
+static inline u32 ioread32(const volatile void __iomem *addr)
+{
+       return readl(addr);
+}
+
+#ifdef CONFIG_64BIT
+static inline u64 ioread64(const volatile void __iomem *addr)
+{
+       return readq(addr);
+}
+#endif /* CONFIG_64BIT */
+
+static inline void iowrite8(u8 value, volatile void __iomem *addr)
+{
+       writeb(value, addr);
+}
+
+static inline void iowrite16(u16 value, volatile void __iomem *addr)
+{
+       writew(value, addr);
+}
+
+static inline void iowrite32(u32 value, volatile void __iomem *addr)
+{
+       writel(value, addr);
+}
+
+#ifdef CONFIG_64BIT
+static inline void iowrite64(u64 value, volatile void __iomem *addr)
+{
+       writeq(value, addr);
+}
+#endif /* CONFIG_64BIT */
+
 #ifndef CONFIG_HAVE_ARCH_IOREMAP
 static inline void __iomem *ioremap(resource_size_t offset,
                                    resource_size_t size)