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SubjectRe: [PATCH v3 5/8] dmaengine: rcar-dmac: group slave configuration
Date
Hi Niklas,

Thank you for the patch.

On Wednesday 10 February 2016 01:57:55 Niklas Söderlund wrote:
> Group slave address and transfer size in own structs for source and
> destination. This is in preparation for hooking up the dma-mapping API
> to the slave addresses.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
> drivers/dma/sh/rcar-dmac.c | 37 +++++++++++++++++++++----------------
> 1 file changed, 21 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
> index 7820d07..743873c 100644
> --- a/drivers/dma/sh/rcar-dmac.c
> +++ b/drivers/dma/sh/rcar-dmac.c
> @@ -118,14 +118,21 @@ struct rcar_dmac_desc_page {
> sizeof(struct rcar_dmac_xfer_chunk))
>
> /*
> + * @slave_addr: slave memory address
> + * @xfer_size: size (in bytes) of hardware transfers
> + */
> +struct rcar_dmac_chan_slave {
> + dma_addr_t slave_addr;
> + unsigned int xfer_size;
> +};
> +
> +/*
> * struct rcar_dmac_chan - R-Car Gen2 DMA Controller Channel
> * @chan: base DMA channel object
> * @iomem: channel I/O memory base
> * @index: index of this channel in the controller
> - * @src_xfer_size: size (in bytes) of hardware transfers on the source side
> - * @dst_xfer_size: size (in bytes) of hardware transfers on the
> destination side - * @src_slave_addr: slave source memory address
> - * @dst_slave_addr: slave destination memory address
> + * @src: slave memory address and size on the source side
> + * @dst: slave memory address and size on the destination side
> * @mid_rid: hardware MID/RID for the DMA client using this channel
> * @lock: protects the channel CHCR register and the desc members
> * @desc.free: list of free descriptors
> @@ -142,10 +149,8 @@ struct rcar_dmac_chan {
> void __iomem *iomem;
> unsigned int index;
>
> - unsigned int src_xfer_size;
> - unsigned int dst_xfer_size;
> - dma_addr_t src_slave_addr;
> - dma_addr_t dst_slave_addr;
> + struct rcar_dmac_chan_slave src;
> + struct rcar_dmac_chan_slave dst;
> int mid_rid;
>
> spinlock_t lock;
> @@ -793,13 +798,13 @@ static void rcar_dmac_chan_configure_desc(struct
> rcar_dmac_chan *chan, case DMA_DEV_TO_MEM:
> chcr = RCAR_DMACHCR_DM_INC | RCAR_DMACHCR_SM_FIXED
>
> | RCAR_DMACHCR_RS_DMARS;
>
> - xfer_size = chan->src_xfer_size;
> + xfer_size = chan->src.xfer_size;
> break;
>
> case DMA_MEM_TO_DEV:
> chcr = RCAR_DMACHCR_DM_FIXED | RCAR_DMACHCR_SM_INC
>
> | RCAR_DMACHCR_RS_DMARS;
>
> - xfer_size = chan->dst_xfer_size;
> + xfer_size = chan->dst.xfer_size;
> break;
>
> case DMA_MEM_TO_MEM:
> @@ -1038,7 +1043,7 @@ rcar_dmac_prep_slave_sg(struct dma_chan *chan, struct
> scatterlist *sgl, }
>
> dev_addr = dir == DMA_DEV_TO_MEM
> - ? rchan->src_slave_addr : rchan->dst_slave_addr;
> + ? rchan->src.slave_addr : rchan->dst.slave_addr;
> return rcar_dmac_chan_prep_sg(rchan, sgl, sg_len, dev_addr,
> dir, flags, false);
> }
> @@ -1093,7 +1098,7 @@ rcar_dmac_prep_dma_cyclic(struct dma_chan *chan,
> dma_addr_t buf_addr, }
>
> dev_addr = dir == DMA_DEV_TO_MEM
> - ? rchan->src_slave_addr : rchan->dst_slave_addr;
> + ? rchan->src.slave_addr : rchan->dst.slave_addr;
> desc = rcar_dmac_chan_prep_sg(rchan, sgl, sg_len, dev_addr,
> dir, flags, true);
>
> @@ -1110,10 +1115,10 @@ static int rcar_dmac_device_config(struct dma_chan
> *chan, * We could lock this, but you shouldn't be configuring the
> * channel, while using it...
> */
> - rchan->src_slave_addr = cfg->src_addr;
> - rchan->dst_slave_addr = cfg->dst_addr;
> - rchan->src_xfer_size = cfg->src_addr_width;
> - rchan->dst_xfer_size = cfg->dst_addr_width;
> + rchan->src.slave_addr = cfg->src_addr;
> + rchan->dst.slave_addr = cfg->dst_addr;
> + rchan->src.xfer_size = cfg->src_addr_width;
> + rchan->dst.xfer_size = cfg->dst_addr_width;
>
> return 0;
> }

--
Regards,

Laurent Pinchart

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