Re: [PATCH] drivers/block/xsysace - replacein(out)_8/in(out)_be16/in(out)_le16 with generic iowrite(read)8/16(be)

[Benjamin Herrenschmidt]

On Thu, 2013-02-07 at 19:12 +0400, Alexey Brodkin wrote:
> not sure about items for "ace_datain/out_be16" - what about _rep
> options here?

Well, you have a backward wiring of an LE device so you can't use the
_rep variants, unless you ping pong, so you either use a loop of
ioread/write16 (le) and bite the bullet on extra barriers, or use _rep &
bounce buffer for a separate swap pass.

Point is, the backward wiring will require byteswap on both BE and LE
hosts for data (which is why it's so stupid).

Cheers,
Ben.



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