[PATCH v4 17/19] arm: Add IO accessors to avoid register-writeback

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From: Christoffer Dall <christoffer.dall@xxxxxxxxxx>

Add IO accessor functions to the arm library functions to avoid
register-writeback IO accessors that are not yet supported by the
kernel.

Signed-off-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
---
 lib/arm/asm/io.h | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/lib/arm/asm/io.h b/lib/arm/asm/io.h
index 51ec6e9aa2e99..1d0abb7d9f405 100644
--- a/lib/arm/asm/io.h
+++ b/lib/arm/asm/io.h
@@ -3,6 +3,9 @@
 #include "libcflat.h"
 #include "asm/barrier.h"
 
+#define __iomem
+#define __force
+
 #define __bswap16 bswap16
 static inline u16 bswap16(u16 val)
 {
@@ -19,6 +22,60 @@ static inline u32 bswap32(u32 val)
 	return ret;
 }
 
+#define __raw_readb __raw_readb
+static inline u8 __raw_readb(const volatile void __iomem *addr)
+{
+	u8 val;
+	asm volatile("ldrb %1, %0"
+		     : "+Qo" (*(volatile u8 __force *)addr),
+		       "=r" (val));
+	return val;
+}
+
+#define __raw_readw __raw_readw
+static inline u16 __raw_readw(const volatile void __iomem *addr)
+{
+	u16 val;
+	asm volatile("ldrh %1, %0"
+		     : "+Q" (*(volatile u16 __force *)addr),
+		       "=r" (val));
+	return val;
+}
+
+#define __raw_readl __raw_readl
+static inline u32 __raw_readl(const volatile void __iomem *addr)
+{
+	u32 val;
+	asm volatile("ldr %1, %0"
+		     : "+Qo" (*(volatile u32 __force *)addr),
+		       "=r" (val));
+	return val;
+}
+
+#define __raw_writeb __raw_writeb
+static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
+{
+	asm volatile("strb %1, %0"
+		     : "+Qo" (*(volatile u8 __force *)addr)
+		     : "r" (val));
+}
+
+#define __raw_writew __raw_writew
+static inline void __raw_writew(u16 val, volatile void __iomem *addr)
+{
+	asm volatile("strh %1, %0"
+		     : "+Q" (*(volatile u16 __force *)addr)
+		     : "r" (val));
+}
+
+#define __raw_writel __raw_writel
+static inline void __raw_writel(u32 val, volatile void __iomem *addr)
+{
+	asm volatile("str %1, %0"
+		     : "+Qo" (*(volatile u32 __force *)addr)
+		     : "r" (val));
+}
+
 #include "asm-generic/io.h"
 
 #endif /* _ASMARM_IO_H_ */
-- 
1.8.1.4

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