linux-kernel - Re: [PATCH v2] dmaengine: add CSR SiRFprimaII DMAC driver

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Date:	Sat, 17 Sep 2011 16:02:46 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Barry Song <Baohua.Song@....com>
Cc:	vinod.koul@...el.com, Arnd Bergmann <arnd@...db.de>,
	Jassi Brar <jaswinder.singh@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, workgroup.linux@....com,
	Rongjun Ying <rongjun.ying@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] dmaengine: add CSR SiRFprimaII DMAC driver

On Fri, Sep 16, 2011 at 02:56:00AM -0700, Barry Song wrote:
> +static int sirfsoc_dma_slave_config(struct sirfsoc_dma_chan *schan,
> +	struct dma_slave_config *config)
> +{
> +	u32 addr, direction;
> +	unsigned long flags;
> +
> +	switch (config->direction) {

config->direction is deprecated, please don't use it.

> +	case DMA_FROM_DEVICE:
> +		direction = 0;
> +		addr = config->dst_addr;
> +		break;
> +
> +	case DMA_TO_DEVICE:
> +		direction = 1;
> +		addr = config->src_addr;
> +		break;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	if ((config->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) ||
> +		(config->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES))
> +		return -EINVAL;
> +
> +	spin_lock_irqsave(&schan->lock, flags);
> +	schan->addr = addr;
> +	schan->direction = direction;
> +	schan->mode = (config->src_maxburst == 4 ? 1 : 0);

Please store the source address, destination address, and mode separately
for each direction.  You should then select from that at prepare time.
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