linux-kernel - Re: [PATCH] dmaengine: vdma: Add 64 bit addressing support to the driver

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Date:	Sun, 23 Aug 2015 19:09:33 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	Michal Simek <michals@...inx.com>,
	Soren Brinkmann <sorenb@...inx.com>,
	"srikanth.thokala@...inx.com" <srikanth.thokala@...inx.com>,
	"maxime.ripard@...e-electrons.com" <maxime.ripard@...e-electrons.com>,
	Appana Durga Kedareswara Rao <appanad@...inx.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Anirudha Sarangi <anirudh@...inx.com>,
	Srikanth Vemula <svemula@...inx.com>
Subject: Re: [PATCH] dmaengine: vdma: Add 64 bit addressing support to the
 driver

On Fri, Aug 21, 2015 at 02:01:59AM +0300, Laurent Pinchart wrote:
> > > How is 64 bit DMA addressing implemented ? Can you use a 64-bit VDMA on
> > > a 32- bit platform with LPAE ? Can you use a 32-bit VDMA on a 64-bit
> > > platform ? Given that VDMA is an IP core you can instantiate in the
> > > programmable logic I expect some level of flexibility to be possible, but
> > > this patch doesn't seem to support it. Please provide more context to
> > > allow a proper review (and please include it in the commit message of v2).
> > 
> > The VDMA core is a soft ip, which can be programmed to support both 32 bit
> > and 64 bit addressing.When the VDMA core is configured for 32 bit address
> > space , transfer start address is specified by a single register.
> > 
> > When the  VDMA core is configured for an address space greater than 32, each
> > start address is specified by a combination of two registers.The first
> > register specifies the LSB 32 bits of address, while the next register
> > specifies the MSB 32 bits of address.For example,5Ch will specify the LSB
> > bits while 60h will specify the MSB bits of the first start address. So we
> > need to program two registers at a time.
> > 
> > Yes,64 bit vdma can be used on 32 bit platform and 32 bit vdma can also be
> > used on 64 bit platform.As far as i know , there is no use case where 64
> > bit dma can be used on 32 bit platform.Please correct me if i am wrong.
> 
> I'm not sure what the use cases would be, but it makes me feel uncomfortable 
> to decide on whether the VDMA is 32 or 64 bits based on the type of CPU.
> 
> As the VDMA flavour is selected at synthesis time, how about specifying it in 
> DT instead ? You could just add an address-width property.
That would be saner thing to do. People wont check which IP and will mix and
match. So you may have a 64 bit system with your 32 bit IP...

-- 
~Vinod
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