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arm: asm: io.h: define readX_relaxed and writeX_relaxed

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This patch port the function readX_relaxed and
writeX_relaxed from kernel 4.18.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
This commit is contained in:
Philippe Reynes 2019-03-15 15:14:33 +01:00 committed by Tom Rini
parent 9db29b300f
commit 6478848d16
1 changed files with 21 additions and 0 deletions
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21
arch/arm/include/asm/io.h
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@ -122,6 +122,27 @@ static inline void __raw_readsl(unsigned long addr, void *data, int longlen)
#define readl(c) ({ u32 __v = __arch_getl(c); __iormb(); __v; })
#define readq(c) ({ u64 __v = __arch_getq(c); __iormb(); __v; })
/*
* Relaxed I/O memory access primitives. These follow the Device memory
* ordering rules but do not guarantee any ordering relative to Normal memory
* accesses.
*/
#define readb_relaxed(c) ({ u8 __r = __raw_readb(c); __r; })
#define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16) \
__raw_readw(c)); __r; })
#define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \
__raw_readl(c)); __r; })
#define readq_relaxed(c) ({ u64 __r = le64_to_cpu((__force __le64) \
__raw_readq(c)); __r; })
#define writeb_relaxed(v, c) ((void)__raw_writeb((v), (c)))
#define writew_relaxed(v, c) ((void)__raw_writew((__force u16) \
cpu_to_le16(v), (c)))
#define writel_relaxed(v, c) ((void)__raw_writel((__force u32) \
cpu_to_le32(v), (c)))
#define writeq_relaxed(v, c) ((void)__raw_writeq((__force u64) \
cpu_to_le64(v), (c)))
/*
* The compiler seems to be incapable of optimising constants
* properly. Spell it out to the compiler in some cases.