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linux-next/include/linux/io-64-nonatomic-lo-hi.h
Logan Gunthorpe c81d64d3dc io-64-nonatomic: add io{read|write}64[be]{_lo_hi|_hi_lo} macros
This patch adds generic io{read|write}64[be]{_lo_hi|_hi_lo} macros if
they are not already defined by the architecture. (As they are provided
by the generic iomap library).

The patch also points io{read|write}64[be] to the variant specified by the
header name.

This is because new drivers are encouraged to use ioreadXX, et al instead
of readX[1], et al -- and mixing ioreadXX with readq is pretty ugly.

[1] LDD3: section 9.4.2

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-01-22 13:39:59 +01:00

123 lines
2.4 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_IO_64_NONATOMIC_LO_HI_H_
#define _LINUX_IO_64_NONATOMIC_LO_HI_H_
#include <linux/io.h>
#include <asm-generic/int-ll64.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);
}
static inline __u64 lo_hi_readq_relaxed(const volatile void __iomem *addr)
{
const volatile u32 __iomem *p = addr;
u32 low, high;
low = readl_relaxed(p);
high = readl_relaxed(p + 1);
return low + ((u64)high << 32);
}
static inline void lo_hi_writeq_relaxed(__u64 val, volatile void __iomem *addr)
{
writel_relaxed(val, addr);
writel_relaxed(val >> 32, addr + 4);
}
#ifndef readq
#define readq lo_hi_readq
#endif
#ifndef writeq
#define writeq lo_hi_writeq
#endif
#ifndef readq_relaxed
#define readq_relaxed lo_hi_readq_relaxed
#endif
#ifndef writeq_relaxed
#define writeq_relaxed lo_hi_writeq_relaxed
#endif
#ifndef ioread64_lo_hi
#define ioread64_lo_hi ioread64_lo_hi
static inline u64 ioread64_lo_hi(void __iomem *addr)
{
u32 low, high;
low = ioread32(addr);
high = ioread32(addr + sizeof(u32));
return low + ((u64)high << 32);
}
#endif
#ifndef iowrite64_lo_hi
#define iowrite64_lo_hi iowrite64_lo_hi
static inline void iowrite64_lo_hi(u64 val, void __iomem *addr)
{
iowrite32(val, addr);
iowrite32(val >> 32, addr + sizeof(u32));
}
#endif
#ifndef ioread64be_lo_hi
#define ioread64be_lo_hi ioread64be_lo_hi
static inline u64 ioread64be_lo_hi(void __iomem *addr)
{
u32 low, high;
low = ioread32be(addr + sizeof(u32));
high = ioread32be(addr);
return low + ((u64)high << 32);
}
#endif
#ifndef iowrite64be_lo_hi
#define iowrite64be_lo_hi iowrite64be_lo_hi
static inline void iowrite64be_lo_hi(u64 val, void __iomem *addr)
{
iowrite32be(val, addr + sizeof(u32));
iowrite32be(val >> 32, addr);
}
#endif
#ifndef ioread64
#define ioread64_is_nonatomic
#define ioread64 ioread64_lo_hi
#endif
#ifndef iowrite64
#define iowrite64_is_nonatomic
#define iowrite64 iowrite64_lo_hi
#endif
#ifndef ioread64be
#define ioread64be_is_nonatomic
#define ioread64be ioread64be_lo_hi
#endif
#ifndef iowrite64be
#define iowrite64be_is_nonatomic
#define iowrite64be iowrite64be_lo_hi
#endif
#endif /* _LINUX_IO_64_NONATOMIC_LO_HI_H_ */