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io: Provide _inX() and _outX()

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Since commit a7851aa54c ("io: change outX() to have their own IO barrier
overrides") and commit 87fe2d543f ("io: change inX() to have their own
IO barrier overrides"), the outX and inX functions have memory barriers
which can be overridden.

However, the generic logic_pio lib has continued to use readl/writel et al
for IO port accesses, which has weaker barriers on arm64.

Provide generic _inX() and _outX(), which can be used by logic pio.

For consistency, we check for !defined({in,out}X) && !defined(_{in,out}X),
for defining _{in,out}X, while a check for just !defined({in,out}X) should
suffice.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>
This commit is contained in:
John Garry 2020-03-28 00:06:12 +08:00 committed by Wei Xu
parent 8f3d9f3542
commit f009c89df7
1 changed files with 44 additions and 20 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

64
include/asm-generic/io.h
View file

@ -448,17 +448,15 @@ static inline void writesq(volatile void __iomem *addr, const void *buffer,
#define IO_SPACE_LIMIT 0xffff
#endif
#include <linux/logic_pio.h>
/*
* {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
* implemented on hardware that needs an additional delay for I/O accesses to
* take effect.
*/
#ifndef inb
#define inb inb
static inline u8 inb(unsigned long addr)
#if !defined(inb) && !defined(_inb)
#define _inb _inb
static inline u16 _inb(unsigned long addr)
{
u8 val;
@ -469,9 +467,9 @@ static inline u8 inb(unsigned long addr)
}
#endif
#ifndef inw
#define inw inw
static inline u16 inw(unsigned long addr)
#if !defined(inw) && !defined(_inw)
#define _inw _inw
static inline u16 _inw(unsigned long addr)
{
u16 val;
@ -482,9 +480,9 @@ static inline u16 inw(unsigned long addr)
}
#endif
#ifndef inl
#define inl inl
static inline u32 inl(unsigned long addr)
#if !defined(inl) && !defined(_inl)
#define _inl _inl
static inline u16 _inl(unsigned long addr)
{
u32 val;
@ -495,9 +493,9 @@ static inline u32 inl(unsigned long addr)
}
#endif
#ifndef outb
#define outb outb
static inline void outb(u8 value, unsigned long addr)
#if !defined(outb) && !defined(_outb)
#define _outb _outb
static inline void _outb(u8 value, unsigned long addr)
{
__io_pbw();
__raw_writeb(value, PCI_IOBASE + addr);
@ -505,9 +503,9 @@ static inline void outb(u8 value, unsigned long addr)
}
#endif
#ifndef outw
#define outw outw
static inline void outw(u16 value, unsigned long addr)
#if !defined(outw) && !defined(_outw)
#define _outw _outw
static inline void _outw(u16 value, unsigned long addr)
{
__io_pbw();
__raw_writew(cpu_to_le16(value), PCI_IOBASE + addr);
@ -515,9 +513,9 @@ static inline void outw(u16 value, unsigned long addr)
}
#endif
#ifndef outl
#define outl outl
static inline void outl(u32 value, unsigned long addr)
#if !defined(outl) && !defined(_outl)
#define _outl _outl
static inline void _outl(u32 value, unsigned long addr)
{
__io_pbw();
__raw_writel(cpu_to_le32(value), PCI_IOBASE + addr);
@ -525,6 +523,32 @@ static inline void outl(u32 value, unsigned long addr)
}
#endif
#include <linux/logic_pio.h>
#ifndef inb
#define inb _inb
#endif
#ifndef inw
#define inw _inw
#endif
#ifndef inl
#define inl _inl
#endif
#ifndef outb
#define outb _outb
#endif
#ifndef outw
#define outw _outw
#endif
#ifndef outl
#define outl _outl
#endif
#ifndef inb_p
#define inb_p inb_p
static inline u8 inb_p(unsigned long addr)