linux-kernel - Re: [PATCH v3] dmaengine: Add support for MEMCPY for imx-dma.

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Message-ID: <CACKLOr0_k2WW_qG4fRLORWTbZBjZVY=CGns2A2asGOvNub2vvw@mail.gmail.com>
Date:	Tue, 31 Jan 2012 11:49:52 +0100
From:	javier Martin <javier.martin@...ta-silicon.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arm-kernel@...ts.infradead.org, dan.j.williams@...el.com,
	s.hauer@...gutronix.de, vinod.koul@...el.com,
	Javier Martin <javier.martin@...ta-silicon.com>
Subject: Re: [PATCH v3] dmaengine: Add support for MEMCPY for imx-dma.

On 31 January 2012 11:47, Javier Martin <javier.martin@...ta-silicon.com> wrote:
> MEMCPY transfers allow DMA copies from memory to
> memory. This patch has been tested with dmatest
> device driver.
>
> Signed-off-by: Javier Martin <javier.martin@...ta-silicon.com>
> ---
>  drivers/dma/imx-dma.c |   36 +++++++++++++++++++++++++++++++++++-
>  1 files changed, 35 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
> index 3296a73..9aa6e85 100644
> --- a/drivers/dma/imx-dma.c
> +++ b/drivers/dma/imx-dma.c
> @@ -196,7 +196,8 @@ static int imxdma_alloc_chan_resources(struct dma_chan *chan)
>        struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
>        struct imx_dma_data *data = chan->private;
>
> -       imxdmac->dma_request = data->dma_request;
> +       if (data != NULL)
> +               imxdmac->dma_request = data->dma_request;
>
>        dma_async_tx_descriptor_init(&imxdmac->desc, chan);
>        imxdmac->desc.tx_submit = imxdma_tx_submit;
> @@ -328,6 +329,36 @@ static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
>        return &imxdmac->desc;
>  }
>
> +static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy(
> +       struct dma_chan *chan, dma_addr_t dest,
> +       dma_addr_t src, size_t len, unsigned long flags)
> +{
> +       struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
> +       struct imxdma_engine *imxdma = imxdmac->imxdma;
> +       int ret;
> +
> +       dev_dbg(imxdma->dev, "%s channel: %d src=0x%x dst=0x%x len=%d\n",
> +                       __func__, imxdmac->channel, src, dest, len);
> +
> +       if (imxdmac->status == DMA_IN_PROGRESS)
> +               return NULL;
> +       imxdmac->status = DMA_IN_PROGRESS;
> +
> +       ret = imx_dma_config_channel(imxdmac->imxdma_channel,
> +                              IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
> +                              IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
> +                              0, 0);
> +       if (ret)
> +               return NULL;
> +
> +       ret = imx_dma_setup_single(imxdmac->imxdma_channel, src, len,
> +                                  dest, DMA_MODE_WRITE);
> +       if (ret)
> +               return NULL;
> +
> +       return &imxdmac->desc;
> +}
> +
>  static void imxdma_issue_pending(struct dma_chan *chan)
>  {
>        struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
> @@ -349,6 +380,7 @@ static int __init imxdma_probe(struct platform_device *pdev)
>
>        dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
>        dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
> +       dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask);
>
>        /* Initialize channel parameters */
>        for (i = 0; i < MAX_DMA_CHANNELS; i++) {
> @@ -382,11 +414,13 @@ static int __init imxdma_probe(struct platform_device *pdev)
>        imxdma->dma_device.device_tx_status = imxdma_tx_status;
>        imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg;
>        imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic;
> +       imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy;
>        imxdma->dma_device.device_control = imxdma_control;
>        imxdma->dma_device.device_issue_pending = imxdma_issue_pending;
>
>        platform_set_drvdata(pdev, imxdma);
>
> +       imxdma->dma_device.copy_align = 2; /* 2^2 = 4 bytes alignment */
>        imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
>        dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
>
> --
> 1.7.0.4
>

Hi Vinod,
now that you have merged Sascha's latest patches you can apply this
patch which has been tested against the latest commit of your 'next'
branch ( ba7932334fbede4bb6a4ff4e635391ca7833203f).

Thank you.
-- 
Javier Martin
Vista Silicon S.L.
CDTUC - FASE C - Oficina S-345
Avda de los Castros s/n
39005- Santander. Cantabria. Spain
+34 942 25 32 60
www.vista-silicon.com
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