linux-kernel - Re: [PATCH 1/2] dmaengine: TXx9 Soc DMA Controller driver

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Message-Id: <20090318.110154.76582864.nemoto@toshiba-tops.co.jp>
Date:	Wed, 18 Mar 2009 11:01:54 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	dan.j.williams@...el.com
Cc:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	linux-kernel@...r.kernel.org, haavard.skinnemoen@...el.com
Subject: Re: [PATCH 1/2] dmaengine: TXx9 Soc DMA Controller driver

On Tue, 17 Mar 2009 18:23:46 -0700, Dan Williams <dan.j.williams@...el.com> wrote:
> Now, back to the issue at hand.  Does your driver still need direct
> control over chan->chan_id, or can it now rely on the fact that
> dma_async_device_register() will fail if a channel is not initialized?
>  Or, just use some platform_data to identify the channel in the same
> manner as atmel-mci?

Yes, I still want to control chan->chan_id.

The atmel-mci does not select "channel".  It just pick the first
usable channel of the dma_device specified by platform_data.  I
suppose dw_dmac is symmetric (it can use any channel for any slave).
But TXx9 SoC DMAC channels are hardwired to each peripheral devices.

And I want to call Channel-3 of DMAC-0 "dma0chan3" even if Channel-2
was assigned to for public memcpy channel.

---
Atsushi Nemoto
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