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List: linuxppc-embedded
Subject: Re: [PATCH 14/14] arm/include/asm/io.h : added macros to
From: Sebastian Andrzej Siewior <bigeasy () linutronix ! de>
Date: 2011-08-31 7:35:00
Message-ID: 20110831073500.GB9353 () linutronix ! de
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* 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
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