ARM: Avoid compiler optimization for readb, writeb and friends.

gcc 4.5.1 seems to ignore (at least some) volatile definitions,
avoid that as done in the kernel.

Reading C99 6.7.3 8 and the comment 114) there, I think it is a bug of that
gcc version to ignore the volatile type qualifier used e.g. in __arch_getl().
Anyway, using a definition as in the kernel headers avoids such optimizations when
gcc 4.5.1 is used.

Maybe the headers as used in the current linux-kernel should be used,
but to avoid large changes, I've just added a small change to the current headers.

Signed-off-by: Alexander Holler <holler@ahsoftware.de>
Signed-off-by: Dirk Behme <dirk.behme@googlemail.com>
Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Alessandro Rubini <rubini-list@gnudd.com>
Tested-by: Thomas Weber <weber@corscience.de>
Acked-by: Alexander Holler <holler@ahsoftware.de>
Tested-by: Alexander Holler <holler@ahsoftware.de>

diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index ff1518eb0d1121e23927df7a237d16a37e33861a..3886f15899f2d240b04900cb13a4b4b6018d2e27 100644 (file)
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -117,21 +117,29 @@ extern inline void __raw_readsl(unsigned int addr, void *data, int longlen)
                *buf++ = __arch_getl(addr);
 }
 
-#define __raw_writeb(v,a)              __arch_putb(v,a)
-#define __raw_writew(v,a)              __arch_putw(v,a)
-#define __raw_writel(v,a)              __arch_putl(v,a)
+#define __raw_writeb(v,a)      __arch_putb(v,a)
+#define __raw_writew(v,a)      __arch_putw(v,a)
+#define __raw_writel(v,a)      __arch_putl(v,a)
 
-#define __raw_readb(a)                 __arch_getb(a)
-#define __raw_readw(a)                 __arch_getw(a)
-#define __raw_readl(a)                 __arch_getl(a)
+#define __raw_readb(a)         __arch_getb(a)
+#define __raw_readw(a)         __arch_getw(a)
+#define __raw_readl(a)         __arch_getl(a)
 
-#define writeb(v,a)                    __arch_putb(v,a)
-#define writew(v,a)                    __arch_putw(v,a)
-#define writel(v,a)                    __arch_putl(v,a)
+/*
+ * TODO: The kernel offers some more advanced versions of barriers, it might
+ * have some advantages to use them instead of the simple one here.
+ */
+#define dmb()          __asm__ __volatile__ ("" : : : "memory")
+#define __iormb()      dmb()
+#define __iowmb()      dmb()
+
+#define writeb(v,c)    ({ __iowmb(); __arch_putb(v,c); v; })
+#define writew(v,c)    ({ __iowmb(); __arch_putw(v,c); v; })
+#define writel(v,c)    ({ __iowmb(); __arch_putl(v,c); v; })
 
-#define readb(a)                       __arch_getb(a)
-#define readw(a)                       __arch_getw(a)
-#define readl(a)                       __arch_getl(a)
+#define readb(c)       ({ u8  __v = __arch_getb(c); __iormb(); __v; })
+#define readw(c)       ({ u16 __v = __arch_getw(c); __iormb(); __v; })
+#define readl(c)       ({ u32 __v = __arch_getl(c); __iormb(); __v; })
 
 /*
  * The compiler seems to be incapable of optimising constants