From: Andre Hedrick <andre@linux-ide.org>
To: Richard Zidlicky <rz@linux-m68k.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-kernel@vger.kernel.org
Subject: Re: IDE janitoring comments
Date: Mon, 23 Sep 2002 17:28:03 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.10.10209231726580.2072-100000@master.linux-ide.org> (raw)
In-Reply-To: <20020924000134.A210@linux-m68k.org>
Poke in your own special ide-ops function pointers.
This should have been allowed on a per chipset/channel bases.
Did I miss something?
On Tue, 24 Sep 2002, Richard Zidlicky wrote:
> On Sat, Aug 24, 2002 at 05:09:16PM +0200, Benjamin Herrenschmidt wrote:
>
> > - In ide-iops, the insw, insl, outsw, outsl functions are
> > broken for big endian. They should not do byteswap on these,
> > however, implemeting them with a loop of IN/OUT_BYTE/WORD
> > will cause byteswapped access on archs like PPC.
> > The problem is that the macros IN/OUT_BYTE/WORD don't define
> > non-swapping equivalents that would allow us to correctly
> > implement the "s" versions.
>
> we have one special problem on m68k, on some machines the IDE
> bus is byteswapped (unrelated to cpu endianness). For historical
> and performance reasons data to the HD is by default read and
> written in this "wrong" order (thus the bswap/swapdata option)
> and special fixup code is used in ide_fix_driveid (see
> M68K_IDE_SWAPW). However data returned by IDE_DRIVE_CMD is not
> treated in any way, so that eg WIN_SMART data end up in the
> wrong order on those machines and this is something I would
> like to fix properly.
> I figure I would define ata_*_{control,data} to handle special
> data resp raw HD data and modify ide_handler_parser to return
> specialised interrupt handlers or set some additional flag.
>
> Any thoughts?
>
> Richard
>
Andre Hedrick
LAD Storage Consulting Group
next prev parent reply other threads:[~2002-09-24 0:23 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-24 15:09 IDE janitoring comments Benjamin Herrenschmidt
2002-09-23 22:01 ` Richard Zidlicky
2002-09-23 7:29 ` Benjamin Herrenschmidt
2002-09-24 0:28 ` Andre Hedrick [this message]
2002-09-24 9:27 ` Richard Zidlicky
2002-09-24 11:35 ` Benjamin Herrenschmidt
2002-09-24 12:41 ` Benjamin Herrenschmidt
2002-09-25 3:57 ` Andre Hedrick
2002-08-24 15:15 Benjamin Herrenschmidt
2002-08-24 20:14 ` Alan Cox
2002-08-24 21:01 ` Andre Hedrick
2002-08-24 22:28 ` Benjamin Herrenschmidt
2002-08-24 20:56 ` Andre Hedrick
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