[PATCH v2 1/1] ARM: dmaengine: sun6i: share the dma driver with sun50i

[PATCH v2 1/1] ARM: dmaengine: sun6i: share the dma driver with sun50i

[Hao Zhang]

Add soc a64 dma support.

Signed-off-by: Hao Zhang <hao5781286@gmail.com>
---
 drivers/dma/sun6i-dma.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index 8346199..00fcfc7 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -1028,11 +1028,23 @@ static struct sun6i_dma_config sun8i_h3_dma_cfg = {
 	.nr_max_vchans   = 34,
 };
 
+/*
+ * The A64 has 8 physical channels, a maximum DRQ port id of 27,
+ * and a total of 38 usable source and destination endpoints.
+ */
+
+static struct sun6i_dma_config sun50i_a64_dma_cfg = {
+	.nr_max_channels = 8,
+	.nr_max_requests = 27,
+	.nr_max_vchans   = 38,
+};
+
 static const struct of_device_id sun6i_dma_match[] = {
 	{ .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg },
 	{ .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg },
 	{ .compatible = "allwinner,sun8i-a83t-dma", .data = &sun8i_a83t_dma_cfg },
 	{ .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
+	{ .compatible = "allwinner,sun50i-a64-dma", .data = &sun50i_a64_dma_cfg },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sun6i_dma_match);
@@ -1110,6 +1122,13 @@ static int sun6i_dma_probe(struct platform_device *pdev)
 	sdc->slave.dst_addr_widths		= BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
 						  BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
 						  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+
+	if (of_device_is_compatible(pdev->dev.of_node,
+				    "allwinner,sun50i-a64-dma")) {
+		sdc->slave.src_addr_widths	|= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
+		sdc->slave.dst_addr_widths	|= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
+	}
+
 	sdc->slave.directions			= BIT(DMA_DEV_TO_MEM) |
 						  BIT(DMA_MEM_TO_DEV);
 	sdc->slave.residue_granularity		= DMA_RESIDUE_GRANULARITY_BURST;
-- 
2.7.4

Re: [PATCH v2 1/1] ARM: dmaengine: sun6i: share the dma driver with sun50i

[Maxime Ripard]

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On Sat, Nov 05, 2016 at 04:05:48PM +0800, Hao Zhang wrote:
> Add soc a64 dma support.
> 
> Signed-off-by: Hao Zhang <hao5781286@gmail.com>
> ---
>  drivers/dma/sun6i-dma.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
> index 8346199..00fcfc7 100644
> --- a/drivers/dma/sun6i-dma.c
> +++ b/drivers/dma/sun6i-dma.c
> @@ -1028,11 +1028,23 @@ static struct sun6i_dma_config sun8i_h3_dma_cfg = {
>  	.nr_max_vchans   = 34,
>  };
>  
> +/*
> + * The A64 has 8 physical channels, a maximum DRQ port id of 27,
> + * and a total of 38 usable source and destination endpoints.
> + */
> +
> +static struct sun6i_dma_config sun50i_a64_dma_cfg = {
> +	.nr_max_channels = 8,
> +	.nr_max_requests = 27,
> +	.nr_max_vchans   = 38,
> +};
> +
>  static const struct of_device_id sun6i_dma_match[] = {
>  	{ .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg },
>  	{ .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg },
>  	{ .compatible = "allwinner,sun8i-a83t-dma", .data = &sun8i_a83t_dma_cfg },
>  	{ .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
> +	{ .compatible = "allwinner,sun50i-a64-dma", .data = &sun50i_a64_dma_cfg },

You need to add that compatible to the DT binding documentation.

>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, sun6i_dma_match);
> @@ -1110,6 +1122,13 @@ static int sun6i_dma_probe(struct platform_device *pdev)
>  	sdc->slave.dst_addr_widths		= BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
>  						  BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
>  						  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
> +
> +	if (of_device_is_compatible(pdev->dev.of_node,
> +				    "allwinner,sun50i-a64-dma")) {
> +		sdc->slave.src_addr_widths	|= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
> +		sdc->slave.dst_addr_widths	|= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
> +	}
> +

You'll also need to change convert_buswidth, it will reject any width
higher than 4 bytes.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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