linux-kernel - Re: [PATCH 3/3] dma: jz4780: Add support for the MDMA in the JZ4760(B)

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Date:   Wed, 28 Jul 2021 12:46:20 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Rob Herring <robh+dt@...nel.org>, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, list@...ndingux.net
Subject: Re: [PATCH 3/3] dma: jz4780: Add support for the MDMA in the
 JZ4760(B)

On 18-07-21, 13:20, Paul Cercueil wrote:
> The JZ4760 and JZ4760B SoCs have two regular DMA controllers with 6
> channels each. They also have an extra DMA controller named MDMA
> with only 2 channels, that only supports memcpy operations.

It is dmaengine not dma:

> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  drivers/dma/dma-jz4780.c | 22 ++++++++++++++++++++--
>  1 file changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
> index d71bc7235959..eed505e3cce2 100644
> --- a/drivers/dma/dma-jz4780.c
> +++ b/drivers/dma/dma-jz4780.c
> @@ -93,6 +93,7 @@
>  #define JZ_SOC_DATA_PER_CHAN_PM		BIT(2)
>  #define JZ_SOC_DATA_NO_DCKES_DCKEC	BIT(3)
>  #define JZ_SOC_DATA_BREAK_LINKS		BIT(4)
> +#define JZ_SOC_DATA_ONLY_MEMCPY		BIT(5)

Why -ve logic? Looks like MEMCPY is eveywhere and only peripheral is not
there at few SoC, so use JZ_SOC_DATA_PERIPHERAL
>  
>  /**
>   * struct jz4780_dma_hwdesc - descriptor structure read by the DMA controller.
> @@ -896,8 +897,10 @@ static int jz4780_dma_probe(struct platform_device *pdev)
>  	dd = &jzdma->dma_device;
>  
>  	dma_cap_set(DMA_MEMCPY, dd->cap_mask);
> -	dma_cap_set(DMA_SLAVE, dd->cap_mask);
> -	dma_cap_set(DMA_CYCLIC, dd->cap_mask);
> +	if (!(soc_data->flags & JZ_SOC_DATA_ONLY_MEMCPY)) {
> +		dma_cap_set(DMA_SLAVE, dd->cap_mask);
> +		dma_cap_set(DMA_CYCLIC, dd->cap_mask);
> +	}

and set this if JZ_SOC_DATA_PERIPHERAL is set?

>  
>  	dd->dev = dev;
>  	dd->copy_align = DMAENGINE_ALIGN_4_BYTES;
> @@ -1018,12 +1021,25 @@ static const struct jz4780_dma_soc_data jz4760_dma_soc_data = {
>  	.flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC,
>  };
>  
> +static const struct jz4780_dma_soc_data jz4760_mdma_soc_data = {
> +	.nb_channels = 2,
> +	.transfer_ord_max = 6,
> +	.flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC |
> +		 JZ_SOC_DATA_ONLY_MEMCPY,
> +};
> +
>  static const struct jz4780_dma_soc_data jz4760b_dma_soc_data = {
>  	.nb_channels = 5,
>  	.transfer_ord_max = 6,
>  	.flags = JZ_SOC_DATA_PER_CHAN_PM,
>  };
>  
> +static const struct jz4780_dma_soc_data jz4760b_mdma_soc_data = {
> +	.nb_channels = 2,
> +	.transfer_ord_max = 6,
> +	.flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_ONLY_MEMCPY,
> +};
> +
>  static const struct jz4780_dma_soc_data jz4770_dma_soc_data = {
>  	.nb_channels = 6,
>  	.transfer_ord_max = 6,
> @@ -1052,7 +1068,9 @@ static const struct of_device_id jz4780_dma_dt_match[] = {
>  	{ .compatible = "ingenic,jz4740-dma", .data = &jz4740_dma_soc_data },
>  	{ .compatible = "ingenic,jz4725b-dma", .data = &jz4725b_dma_soc_data },
>  	{ .compatible = "ingenic,jz4760-dma", .data = &jz4760_dma_soc_data },
> +	{ .compatible = "ingenic,jz4760-mdma", .data = &jz4760_mdma_soc_data },
>  	{ .compatible = "ingenic,jz4760b-dma", .data = &jz4760b_dma_soc_data },
> +	{ .compatible = "ingenic,jz4760b-mdma", .data = &jz4760b_mdma_soc_data },
>  	{ .compatible = "ingenic,jz4770-dma", .data = &jz4770_dma_soc_data },
>  	{ .compatible = "ingenic,jz4780-dma", .data = &jz4780_dma_soc_data },
>  	{ .compatible = "ingenic,x1000-dma", .data = &x1000_dma_soc_data },
> -- 
> 2.30.2

-- 
~Vinod