linux-kernel - [PATCH v3 4/5] io: change outX() to have their own IO barrier overrides

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Date:   Wed,  4 Apr 2018 19:58:19 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     arnd@...db.de, timur@...eaurora.org, sulrich@...eaurora.org
Cc:     linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Sinan Kaya <okaya@...eaurora.org>, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 4/5] io: change outX() to have their own IO barrier overrides

Open code writeX() inside outX() so that outX() variants have their own
overrideable Port IO barrier combinations as __io_pbw() and __io_paw() for
actions to be taken before port IO and after port IO write.

Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
---
 include/asm-generic/io.h | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index ca268d9..38a96d1 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -456,7 +456,9 @@ static inline u32 inl(unsigned long addr)
 #define outb outb
 static inline void outb(u8 value, unsigned long addr)
 {
-	writeb(value, PCI_IOBASE + addr);
+	__io_pbw();
+	__raw_writeb(value, PCI_IOBASE + addr);
+	__io_paw();
 }
 #endif
 
@@ -464,7 +466,9 @@ static inline void outb(u8 value, unsigned long addr)
 #define outw outw
 static inline void outw(u16 value, unsigned long addr)
 {
-	writew(value, PCI_IOBASE + addr);
+	__io_pbw();
+	__raw_writew(cpu_to_le16(value), PCI_IOBASE + addr);
+	__io_paw();
 }
 #endif
 
@@ -472,7 +476,9 @@ static inline void outw(u16 value, unsigned long addr)
 #define outl outl
 static inline void outl(u32 value, unsigned long addr)
 {
-	writel(value, PCI_IOBASE + addr);
+	__io_pbw();
+	__raw_writel(cpu_to_le32(value), PCI_IOBASE + addr);
+	__io_paw();
 }
 #endif
 
-- 
2.7.4