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

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Message-ID: <491CC6D4.2080604@caviumnetworks.com>
Date:	Thu, 13 Nov 2008 16:31:16 -0800
From:	David Daney <ddaney@...iumnetworks.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.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.

Sergei Shtylyov wrote:
> 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.

> 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.

Thanks,
David Daney
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