linux-kernel - Re: [PATCH RFC] sh: maple: Add support for SEGA Dreamcast VMU and clean up maple bus driver (1/3)

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Message-ID: <3ca9ec7a13c1a13ea7be6c37bbdfdb0c.squirrel@newgolddream.dyndns.info>
Date:	Thu, 29 Jan 2009 16:43:50 -0000 (UTC)
From:	"Adrian McMenamin" <adrian@...golddream.dyndns.info>
To:	"Paul Mundt" <lethal@...ux-sh.org>,
	"Adrian McMenamin" <adrian@...golddream.dyndns.info>,
	"Greg KH" <greg@...ah.com>,
	"Dmitry Torokhov" <dmitry.torokhov@...il.com>,
	"dwmw2" <dwmw2@...radead.org>,
	"linux-sh" <linux-sh@...r.kernel.org>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"linux-input" <linux-input@...r.kernel.org>,
	"linux-mtd" <linux-mtd@...r.kernel.org>
Subject: Re: [PATCH RFC] sh: maple: Add support for SEGA Dreamcast VMU and 
     clean up maple bus driver (1/3)

On Thu, January 29, 2009 3:13 am, Paul Mundt wrote:
> On Wed, Jan 28, 2009 at 11:57:49PM +0000, Adrian McMenamin wrote:
>> Rework the maple bus driver to support block reads and writes, while
>> also cleaning up the code and aiming for a consistent namespace for
>> functions.
>>
>> -	mutex_init(&mq->mutex);
>> +	mq->recvbuf->buf = (void *)P2SEGADDR(&((mq->recvbuf->bufx)[0]));
>>
> Please do not abuse P2SEGADDR in this fashion. No new code should be
> using P2SEGADDR anyways. maple is particularly abusive in this case since
> it bounces back and forth between P2SEGADDR and PHYSADDR to try and
> ignore the fact cache flushing has to be handled.
>
> You may also wish to consider ioremap/ioremap_nocache().
>

Can I just use dma_cache_sync before each dma run and then use the P1
address space?

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