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SubjectRe: [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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