[PATCH 14/14] arm/include/asm/io.h : added macros to read/write big/little endian register

[Sebastian Andrzej Siewior]

* Pratyush Anand | 2011-08-30 17:28:01 [+0530]:

>diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
>index 815efa2..32282b4 100644
>--- a/arch/arm/include/asm/io.h
>+++ b/arch/arm/include/asm/io.h
>@@ -297,6 +297,14 @@ extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
> extern int devmem_is_allowed(unsigned long pfn);
> #endif
> 
>+/* Big Endian */
>+#define out_be32(a, v) writel(__cpu_to_be32(v), a)
>+#define in_be32(a) __be32_to_cpu(readl(a))
>+
>+/* Little endian */
>+#define out_le32(a, v) writel(__cpu_to_le32(v), a)
>+#define in_le32(a) __le32_to_cpu(readl(a))

In LE-mode __le32_to_cpu() is NOP and you get a LE value.
In BE-mode readl() will swap a and le32_to_cpu will swap a again. So you
get a BE value. Is this what you want?

>+

Please split this patch out and get it accepterd by ARM community. USB
people won't merge this.

Sebastian