linux-kernel - Re: [PATCH] New IDE/block driver for OCTEON SOC Compact Flash interface.

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Date:	Fri, 14 Nov 2008 13:22:45 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-mips <linux-mips@...ux-mips.org>, linux-ide@...r.kernel.org
Subject: Re: [PATCH] New IDE/block driver for OCTEON SOC Compact Flash interface.

Hello

David Daney wrote:

>>> As part of our efforts to get the Cavium OCTEON processor support
>>> merged (see: http://marc.info/?l=linux-mips&m=122600487218824), we
>>> have this CF driver for your consideration.
>>>
>>> Most OCTEON variants have *no* DMA or interrupt support on the CF
>>> interface so a simple bit-banging approach is taken.  Although if 
>>> DMA is
>>> available, we do take advantage of it.
>>>
>>> The register definitions are part of the chip support patch set
>>> mentioned above, and are not included here.
>>>
>>> At this point I would like to get feedback as to whether this is a
>>> good approach for the CF driver, or perhaps generate ideas about other
>>> possible approaches.
>>
>>   It's totally unacceptable for drivers/ide/ as this is 
>> self-containeed driver no using IDE core for anything, so this can 
>> only fit well to drivers/block/.
>
> Not quite true, it is using ide_fix_driveid() and ide_fixstring(), but 
> I get your point.

   Overlooked those. I just saw that it looked very alike the version 
that I've seen -- hidden deep inside arch/mips/ at that time. :-)

> OTOH, CF support via self-contained driver is certainly a waste of 
> code since IDE core and (libata) are here to drive the CF devices as 
> well. What we need is a "normal" IDE or libata (at your option) driver.
>
> I will have to try it to see if the hardware has the necessary support.

   It sure does have the necessary support -- this is a part of CF spec.

> Thanks,
> David Daney

WBR, Sergei


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