Import io-64-nonatomic-*.h from Linux to be able to use various
non-atomic 64-bit I/O accessors.
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
include/io-64-nonatomic-hi-lo.h | 32 ++++++++++++++++++++++++++++++++
include/io-64-nonatomic-lo-hi.h | 32 ++++++++++++++++++++++++++++++++
2 files changed, 64 insertions(+)
create mode 100644 include/io-64-nonatomic-hi-lo.h
create mode 100644 include/io-64-nonatomic-lo-hi.h
diff --git a/include/io-64-nonatomic-hi-lo.h b/include/io-64-nonatomic-hi-lo.h
new file mode 100644
index 000000000..3393e6317
--- /dev/null
+++ b/include/io-64-nonatomic-hi-lo.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_IO_64_NONATOMIC_HI_LO_H_
+#define _LINUX_IO_64_NONATOMIC_HI_LO_H_
+
+#include <io.h>
+
+static inline __u64 hi_lo_readq(const volatile void __iomem *addr)
+{
+ const volatile u32 __iomem *p = addr;
+ u32 low, high;
+
+ high = readl(p + 1);
+ low = readl(p);
+
+ return low + ((u64)high << 32);
+}
+
+static inline void hi_lo_writeq(__u64 val, volatile void __iomem *addr)
+{
+ writel(val >> 32, addr + 4);
+ writel(val, addr);
+}
+
+#ifndef readq
+#define readq hi_lo_readq
+#endif
+
+#ifndef writeq
+#define writeq hi_lo_writeq
+#endif
+
+#endif /* _LINUX_IO_64_NONATOMIC_HI_LO_H_ */
diff --git a/include/io-64-nonatomic-lo-hi.h b/include/io-64-nonatomic-lo-hi.h
new file mode 100644
index 000000000..62b402279
--- /dev/null
+++ b/include/io-64-nonatomic-lo-hi.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_IO_64_NONATOMIC_LO_HI_H_
+#define _LINUX_IO_64_NONATOMIC_LO_HI_H_
+
+#include <io.h>
+
+static inline __u64 lo_hi_readq(const volatile void __iomem *addr)
+{
+ const volatile u32 __iomem *p = addr;
+ u32 low, high;
+
+ low = readl(p);
+ high = readl(p + 1);
+
+ return low + ((u64)high << 32);
+}
+
+static inline void lo_hi_writeq(__u64 val, volatile void __iomem *addr)
+{
+ writel(val, addr);
+ writel(val >> 32, addr + 4);
+}
+
+#ifndef readq
+#define readq lo_hi_readq
+#endif
+
+#ifndef writeq
+#define writeq lo_hi_writeq
+#endif
+
+#endif /* _LINUX_IO_64_NONATOMIC_LO_HI_H_ */
--
2.20.1
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