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authorAndrey Smirnov <andrew.smirnov@gmail.com>2019-02-06 17:22:00 -0800
committerSascha Hauer <s.hauer@pengutronix.de>2019-02-11 08:47:46 +0100
commitba03d043f1548b93d365cdabe93851db30b7274a (patch)
treed72cd2e4d490fcef402a747b77894b7da3841f72 /include/io-64-nonatomic-hi-lo.h
parenta7127d3dee73befbacc63503069e5ccf2b395183 (diff)
downloadbarebox-ba03d043f1548b93d365cdabe93851db30b7274a.tar.gz
barebox-ba03d043f1548b93d365cdabe93851db30b7274a.tar.xz
include: Import io-64-nonatomic-*.h from Linux
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@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include/io-64-nonatomic-hi-lo.h')
-rw-r--r--include/io-64-nonatomic-hi-lo.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/include/io-64-nonatomic-hi-lo.h b/include/io-64-nonatomic-hi-lo.h
new file mode 100644
index 0000000000..3393e6317e
--- /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_ */