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Re: [PATCH v2 3/6] dma: Add a jz4740 dmaengine driver

To: Lars-Peter Clausen <lars@metafoo.de>
Subject: Re: [PATCH v2 3/6] dma: Add a jz4740 dmaengine driver
From: Vinod Koul <vinod.koul@intel.com>
Date: Thu, 30 May 2013 22:42:26 +0530
Cc: Ralf Baechle <ralf@linux-mips.org>, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, Maarten ter Huurne <maarten@treewalker.org>, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org
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On Thu, May 30, 2013 at 06:25:02PM +0200, Lars-Peter Clausen wrote:
> This patch adds dmaengine support for the JZ4740 DMA controller. For now the
> driver will be a wrapper around the custom JZ4740 DMA API. Once all users of 
> the
> custom JZ4740 DMA API have been converted to the dmaengine API the custom API
> will be removed and direct hardware access will be added to the dmaengine
> driver.
> 
> +
> +#include <asm/mach-jz4740/dma.h>
Am bit worried about having header in arch. Why cant we have this drivers header
in linux/. That way same IP block cna be reused across archs.
I was hoping that you would have move it in 6th patch, but that isnt the case


> +static int jz4740_dma_alloc_chan_resources(struct dma_chan *c)
> +{
> +     struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
> +
> +     chan->jz_chan = jz4740_dma_request(chan, NULL);
> +     if (!chan->jz_chan)
> +             return -EBUSY;
> +
> +     jz4740_dma_set_complete_cb(chan->jz_chan, jz4740_dma_complete_cb);
> +
> +     return 0;
Sorry, I didnt reply on this one. The API expects you to allocate a pool of
descriptors. These descriptors are to be used in .device_prep_xxx calls later.

--
~Vinod

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