linux-kernel - Re: [PATCH v11 3/3] DMA: Freescale: update driver to support 8-channel DMA engine

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Message-ID: <525F7C18.3010409@freescale.com>
Date:	Thu, 17 Oct 2013 13:56:40 +0800
From:	Hongbo Zhang <hongbo.zhang@...escale.com>
To:	<hongbo.zhang@...escale.com>, <vinod.koul@...el.com>
CC:	<rob.herring@...xeda.com>, <pawel.moll@....com>,
	<mark.rutland@....com>, <swarren@...dotorg.org>,
	<ian.campbell@...rix.com>, <djbw@...com>,
	<devicetree@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v11 3/3] DMA: Freescale: update driver to support 8-channel
 DMA engine

Hi Vinod,
I have gotten ACK from Mark for both the 1/3 and 2/3 patches.
Thanks.


On 09/26/2013 05:33 PM, hongbo.zhang@...escale.com wrote:
> From: Hongbo Zhang <hongbo.zhang@...escale.com>
>
> This patch adds support to 8-channel DMA engine, thus the driver works for both
> the new 8-channel and the legacy 4-channel DMA engines.
>
> Signed-off-by: Hongbo Zhang <hongbo.zhang@...escale.com>
> ---
>   drivers/dma/Kconfig  |    9 +++++----
>   drivers/dma/fsldma.c |    9 ++++++---
>   drivers/dma/fsldma.h |    2 +-
>   3 files changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index 6825957..3979c65 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -89,14 +89,15 @@ config AT_HDMAC
>   	  Support the Atmel AHB DMA controller.
>   
>   config FSL_DMA
> -	tristate "Freescale Elo and Elo Plus DMA support"
> +	tristate "Freescale Elo series DMA support"
>   	depends on FSL_SOC
>   	select DMA_ENGINE
>   	select ASYNC_TX_ENABLE_CHANNEL_SWITCH
>   	---help---
> -	  Enable support for the Freescale Elo and Elo Plus DMA controllers.
> -	  The Elo is the DMA controller on some 82xx and 83xx parts, and the
> -	  Elo Plus is the DMA controller on 85xx and 86xx parts.
> +	  Enable support for the Freescale Elo series DMA controllers.
> +	  The Elo is the DMA controller on some mpc82xx and mpc83xx parts, the
> +	  EloPlus is on mpc85xx and mpc86xx and Pxxx parts, and the Elo3 is on
> +	  some Txxx and Bxxx parts.
>   
>   config MPC512X_DMA
>   	tristate "Freescale MPC512x built-in DMA engine support"
> diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
> index 49e8fbd..16a9a48 100644
> --- a/drivers/dma/fsldma.c
> +++ b/drivers/dma/fsldma.c
> @@ -1261,7 +1261,9 @@ static int fsl_dma_chan_probe(struct fsldma_device *fdev,
>   	WARN_ON(fdev->feature != chan->feature);
>   
>   	chan->dev = fdev->dev;
> -	chan->id = ((res.start - 0x100) & 0xfff) >> 7;
> +	chan->id = (res.start & 0xfff) < 0x300 ?
> +		   ((res.start - 0x100) & 0xfff) >> 7 :
> +		   ((res.start - 0x200) & 0xfff) >> 7;
>   	if (chan->id >= FSL_DMA_MAX_CHANS_PER_DEVICE) {
>   		dev_err(fdev->dev, "too many channels for device\n");
>   		err = -EINVAL;
> @@ -1434,6 +1436,7 @@ static int fsldma_of_remove(struct platform_device *op)
>   }
>   
>   static const struct of_device_id fsldma_of_ids[] = {
> +	{ .compatible = "fsl,elo3-dma", },
>   	{ .compatible = "fsl,eloplus-dma", },
>   	{ .compatible = "fsl,elo-dma", },
>   	{}
> @@ -1455,7 +1458,7 @@ static struct platform_driver fsldma_of_driver = {
>   
>   static __init int fsldma_init(void)
>   {
> -	pr_info("Freescale Elo / Elo Plus DMA driver\n");
> +	pr_info("Freescale Elo series DMA driver\n");
>   	return platform_driver_register(&fsldma_of_driver);
>   }
>   
> @@ -1467,5 +1470,5 @@ static void __exit fsldma_exit(void)
>   subsys_initcall(fsldma_init);
>   module_exit(fsldma_exit);
>   
> -MODULE_DESCRIPTION("Freescale Elo / Elo Plus DMA driver");
> +MODULE_DESCRIPTION("Freescale Elo series DMA driver");
>   MODULE_LICENSE("GPL");
> diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h
> index f5c3879..1ffc244 100644
> --- a/drivers/dma/fsldma.h
> +++ b/drivers/dma/fsldma.h
> @@ -112,7 +112,7 @@ struct fsldma_chan_regs {
>   };
>   
>   struct fsldma_chan;
> -#define FSL_DMA_MAX_CHANS_PER_DEVICE 4
> +#define FSL_DMA_MAX_CHANS_PER_DEVICE 8
>   
>   struct fsldma_device {
>   	void __iomem *regs;	/* DGSR register base */



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