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author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2019-02-06 17:22:00 -0800 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2019-02-11 08:47:46 +0100 |
commit | ba03d043f1548b93d365cdabe93851db30b7274a (patch) | |
tree | d72cd2e4d490fcef402a747b77894b7da3841f72 /include/io-64-nonatomic-hi-lo.h | |
parent | a7127d3dee73befbacc63503069e5ccf2b395183 (diff) | |
download | barebox-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.h | 32 |
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_ */ |