[RFC PATCH 10/28] lkl: memory mapped I/O support

[Octavian Purdila]

All memory mapped I/O access is redirected to the host via the
iomem_access host operation. The host can setup the memory mapped I/O
region via the ioremap operation.

This allows the host to implement support for various devices, such as
block or network devices.

Signed-off-by: Octavian Purdila <octavian.purdila@xxxxxxxxx>
---
 arch/lkl/include/asm/io.h | 104 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 arch/lkl/include/asm/io.h

diff --git a/arch/lkl/include/asm/io.h b/arch/lkl/include/asm/io.h
new file mode 100644
index 0000000..fd6f4af
--- /dev/null
+++ b/arch/lkl/include/asm/io.h
@@ -0,0 +1,104 @@
+#ifndef _ASM_LKL_IO_H
+#define _ASM_LKL_IO_H
+
+#include <asm/bug.h>
+#include <asm/host_ops.h>
+
+#define __raw_readb __raw_readb
+static inline u8 __raw_readb(const volatile void __iomem *addr)
+{
+	int ret;
+	u8 value;
+
+	ret = lkl_ops->iomem_access(addr, &value, sizeof(value), 0);
+	WARN(ret, "error reading iomem %p", addr);
+
+	return value;
+}
+
+#define __raw_readw __raw_readw
+static inline u16 __raw_readw(const volatile void __iomem *addr)
+{
+	int ret;
+	u16 value;
+
+	ret = lkl_ops->iomem_access(addr, &value, sizeof(value), 0);
+	WARN(ret, "error reading iomem %p", addr);
+
+	return value;
+}
+
+#define __raw_readl __raw_readl
+static inline u32 __raw_readl(const volatile void __iomem *addr)
+{
+	int ret;
+	u32 value;
+
+	ret = lkl_ops->iomem_access(addr, &value, sizeof(value), 0);
+	WARN(ret, "error reading iomem %p", addr);
+
+	return value;
+}
+
+#ifdef CONFIG_64BIT
+#define __raw_readq __raw_readq
+static inline u64 __raw_readq(const volatile void __iomem *addr)
+{
+	int ret;
+	u64 value;
+
+	ret = lkl_ops->iomem_access(addr, &value, sizeof(value), 0);
+	WARN(ret, "error reading iomem %p", addr);
+
+	return value;
+}
+#endif /* CONFIG_64BIT */
+
+#define __raw_writeb __raw_writeb
+static inline void __raw_writeb(u8 value, volatile void __iomem *addr)
+{
+	int ret;
+
+	ret = lkl_ops->iomem_access(addr, &value, sizeof(value), 1);
+	WARN(ret, "error writing iomem %p", addr);
+}
+
+#define __raw_writew __raw_writew
+static inline void __raw_writew(u16 value, volatile void __iomem *addr)
+{
+	int ret;
+
+	ret = lkl_ops->iomem_access(addr, &value, sizeof(value), 1);
+	WARN(ret, "error writing iomem %p", addr);
+}
+
+#define __raw_writel __raw_writel
+static inline void __raw_writel(u32 value, volatile void __iomem *addr)
+{
+	int ret;
+
+	ret = lkl_ops->iomem_access(addr, &value, sizeof(value), 1);
+	WARN(ret, "error writing iomem %p", addr);
+}
+
+#ifdef CONFIG_64BIT
+#define __raw_writeq __raw_writeq
+static inline void __raw_writeq(u64 value, volatile void __iomem *addr)
+{
+	int ret;
+
+	ret = lkl_ops->iomem_access(addr, &value, sizeof(value), 1);
+	WARN(ret, "error writing iomem %p", addr);
+}
+#endif /* CONFIG_64BIT */
+
+#define ioremap ioremap
+static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
+{
+	return (void __iomem *)lkl_ops->ioremap(offset, size);
+}
+
+#include <asm-generic/io.h>
+
+#endif /* _ASM_LKL_IO_H */
+
-- 
2.1.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/