1 files changed, 72 insertions, 0 deletions
diff --git a/include/linux/io.h b/include/linux/io.h
new file mode 100644
index 0000000..7984788
--- /dev/null
+++ b/include/linux/io.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef _LINUX_IO_H
+#define _LINUX_IO_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <asm/io.h>
+
+#ifndef CONFIG_HAVE_ARCH_IOMAP
+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);
+}
+#endif /* !CONFIG_HAVE_ARCH_IOMAP */
+
+#ifdef CONFIG_64BIT
+static inline u64 ioread64(const volatile void __iomem *addr)
+{
+	return readq(addr);
+}
+#endif /* CONFIG_64BIT */
+
+#ifndef CONFIG_HAVE_ARCH_IOMAP
+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);
+}
+#endif /* !CONFIG_HAVE_ARCH_IOMAP */
+
+#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)
+{
+	return (void __iomem *)(unsigned long)offset;
+}
+
+static inline void iounmap(void __iomem *addr)
+{
+}
+#endif
+
+#define devm_ioremap(dev, offset, size)		ioremap(offset, size)
+
+#endif /* _LINUX_IO_H */