linux-kernel - Re: [PATCH 01/10] dmaengine: add new enum dma_transfer

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Date:	Fri, 14 Oct 2011 14:15:59 +0800
From:	Barry Song <21cnbao@...il.com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	dan.j.williams@...el.com, linux-kernel@...r.kernel.org,
	jaswinder.singh@...aro.org, rmk@....linux.org.uk,
	Vinod Koul <vinod.koul@...ux.intel.com>,
	DL-SHA-WorkGroupLinux <workgroup.linux@....com>
Subject: Re: [PATCH 01/10] dmaengine: add new enum dma_transfer_direction

2011/10/14 Vinod Koul <vinod.koul@...el.com>:
> From: Vinod Koul <vinod.koul@...ux.intel.com>
>
> This new enum removes usage of dma_data_direction for dma direction. The new
> enum cleans tells the DMA direction and mode
> This further paves way for merging the dmaengine _prep operations and also for
> interleaved dma
>
> Suggested-by: Jassi Brar <jaswinder.singh@...aro.org>
> Signed-off-by: Vinod Koul <vinod.koul@...ux.intel.com>

Reviewed-by: Barry Song <Baohua.Song@....com>

> ---
>  include/linux/dmaengine.h |   22 +++++++++++++++++-----
>  1 files changed, 17 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> index ace51af..24942ad 100644
> --- a/include/linux/dmaengine.h
> +++ b/include/linux/dmaengine.h
> @@ -23,7 +23,6 @@
>
>  #include <linux/device.h>
>  #include <linux/uio.h>
> -#include <linux/dma-direction.h>
>  #include <linux/scatterlist.h>
>
>  /**
> @@ -75,6 +74,19 @@ enum dma_transaction_type {
>  /* last transaction type for creation of the capabilities mask */
>  #define DMA_TX_TYPE_END (DMA_CYCLIC + 1)
>
> +/**
> + * enum dma_transfer_direction - dma transfer mode and direction indicator
> + * @MEM_TO_MEM: Async/Memcpy mode
> + * @MEM_TO_DEV: Slave mode & From Memory to Device
> + * @DEV_TO_MEM: Slave mode & From Device to Memory
> + * @DEV_TO_DEV: Slave mode & From Device to Device
> + */
> +enum dma_transfer_direction {
> +       MEM_TO_MEM,
> +       MEM_TO_DEV,
> +       DEV_TO_MEM,
> +       DEV_TO_DEV,
> +};
>
>  /**
>  * enum dma_ctrl_flags - DMA flags to augment operation preparation,
> @@ -267,7 +279,7 @@ enum dma_slave_buswidth {
>  * struct, if applicable.
>  */
>  struct dma_slave_config {
> -       enum dma_data_direction direction;
> +       enum dma_transfer_direction direction;
>        dma_addr_t src_addr;
>        dma_addr_t dst_addr;
>        enum dma_slave_buswidth src_addr_width;
> @@ -490,11 +502,11 @@ struct dma_device {
>
>        struct dma_async_tx_descriptor *(*device_prep_slave_sg)(
>                struct dma_chan *chan, struct scatterlist *sgl,
> -               unsigned int sg_len, enum dma_data_direction direction,
> +               unsigned int sg_len, enum dma_transfer_direction direction,
>                unsigned long flags);
>        struct dma_async_tx_descriptor *(*device_prep_dma_cyclic)(
>                struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
> -               size_t period_len, enum dma_data_direction direction);
> +               size_t period_len, enum dma_transfer_direction direction);
>        int (*device_control)(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
>                unsigned long arg);
>
> @@ -520,7 +532,7 @@ static inline int dmaengine_slave_config(struct dma_chan *chan,
>
>  static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single(
>        struct dma_chan *chan, void *buf, size_t len,
> -       enum dma_data_direction dir, unsigned long flags)
> +       enum dma_transfer_direction dir, unsigned long flags)
>  {
>        struct scatterlist sg;
>        sg_init_one(&sg, buf, len);
> --
> 1.7.0.4
>
>
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