linux-kernel - Do cpu-endian MMIO accessors exist?

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Message-ID: <20090721234243.1928d9e2@daedalus.pq.iki.fi>
Date:	Tue, 21 Jul 2009 23:42:43 +0300
From:	Pekka Paalanen <pq@....fi>
To:	linux-kernel@...r.kernel.org
Subject: Do cpu-endian MMIO accessors exist?

Hi,

This is for Nouveau, where the hardware is configured to have the
same endianess as the cpu. Well, it's configured BE for PPC and
LE otherwise.

I'm looking for to drop the following kind of #ifdefs:

#if defined(__powerpc__)
static inline u32 nv_rd32(struct drm_device *dev, unsigned reg)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        return in_be32((void __force __iomem *)dev_priv->mmio->handle + reg);
}
#else
static inline u32 nv_rd32(struct drm_device *dev, unsigned reg)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        return readl((void __force __iomem *)dev_priv->mmio->handle + reg);
}
#endif

Please, don't mind about the other ugliness, that will be fixed.

Do cpu-endian MMIO accessors exist? What should I use, or do I just
have to use #ifdef __BIG_ENDIAN?

Thanks.
Please, Cc me.

-- 
Pekka Paalanen
http://www.iki.fi/pq/
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