[PATCH V4 03/14] DMA: PL330: Support DMA_SLAVE_CONFIG command

[Vinod Koul]

On Mon, 2011-07-25 at 10:28 +0900, Boojin Kim wrote:
> This patch adds support DMA_SLAVE_CONFIG command.
> 
> Signed-off-by: Boojin Kim <boojin.kim at samsung.com>
> ---
>  drivers/dma/pl330.c |   53 +++++++++++++++++++++++++++++++++++++-------------
>  1 files changed, 39 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
> index 586ab39..880f010 100644
> --- a/drivers/dma/pl330.c
> +++ b/drivers/dma/pl330.c
> @@ -256,25 +256,50 @@ static int pl330_alloc_chan_resources(struct dma_chan *chan)
>  static int pl330_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg)
>  {
>  	struct dma_pl330_chan *pch = to_pchan(chan);
> -	struct dma_pl330_desc *desc;
> +	struct dma_pl330_desc *desc, *_dt;
>  	unsigned long flags;
> +	struct dma_pl330_dmac *pdmac = pch->dmac;
> +	struct dma_slave_config *slave_config;
> +	struct dma_pl330_peri *peri;
> +	LIST_HEAD(list);
>  
> -	/* Only supports DMA_TERMINATE_ALL */
> -	if (cmd != DMA_TERMINATE_ALL)
> -		return -ENXIO;
> -
> -	spin_lock_irqsave(&pch->lock, flags);
> -
> -	/* FLUSH the PL330 Channel thread */
> -	pl330_chan_ctrl(pch->pl330_chid, PL330_OP_FLUSH);
> +	switch (cmd) {
> +	case DMA_TERMINATE_ALL:
> +		spin_lock_irqsave(&pch->lock, flags);
>  
> -	/* Mark all desc done */
> -	list_for_each_entry(desc, &pch->work_list, node)
> -		desc->status = DONE;
> +		/* FLUSH the PL330 Channel thread */
> +		pl330_chan_ctrl(pch->pl330_chid, PL330_OP_FLUSH);
>  
> -	spin_unlock_irqrestore(&pch->lock, flags);
> +		/* Mark all desc done */
> +		list_for_each_entry_safe(desc, _dt, &pch->work_list , node) {
> +			desc->status = DONE;
> +			pch->completed = desc->txd.cookie;
> +			list_move_tail(&desc->node, &list);
> +		}
>  
> -	pl330_tasklet((unsigned long) pch);
> +		list_splice_tail_init(&list, &pdmac->desc_pool);
> +		spin_unlock_irqrestore(&pch->lock, flags);
> +		break;
> +	case DMA_SLAVE_CONFIG:
> +		slave_config = (struct dma_slave_config *)arg;
> +		peri = pch->chan.private;
> +
> +		if (slave_config->direction == DMA_TO_DEVICE) {
> +			if (slave_config->dst_addr)
> +				peri->fifo_addr = slave_config->dst_addr;
> +			if (slave_config->dst_addr_width)
> +				peri->burst_sz = __ffs(slave_config->dst_addr_width);
This doesn't sound right, why can't you use xxx_maxburst field instead?

> +		} else if (slave_config->direction == DMA_FROM_DEVICE) {
> +			if (slave_config->src_addr)
> +				peri->fifo_addr = slave_config->src_addr;
> +			if (slave_config->src_addr_width)
> +				peri->burst_sz = __ffs(slave_config->src_addr_width);
ditto...
> +		}
> +		break;
> +	default:
> +		dev_err(pch->dmac->pif.dev, "Not supported command.\n");
> +		return -ENXIO;
> +	}
>  
>  	return 0;
>  }

-- 
~Vinod Koul
Intel Corp.