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Date:   Sun, 26 May 2019 20:34:25 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        Dan Williams <dan.j.williams@...el.com>,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jernej Skrabec <jernej.skrabec@...l.net>
Subject: Re: [PATCH v2 5/7] dmaengine: sun6i: Add support for H6 DMA

On Sat, May 25, 2019 at 06:38:17PM +0200, Clément Péron wrote:
> From: Jernej Skrabec <jernej.skrabec@...l.net>
>
> H6 DMA has more than 32 supported DRQs, which means that configuration
> register is slightly rearranged. It also needs additional clock to be
> enabled.
>
> Add support for it.
>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> Signed-off-by: Clément Péron <peron.clem@...il.com>
> ---
>  drivers/dma/sun6i-dma.c | 44 +++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 42 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
> index f5cb5e89bf7b..8d44ddae926a 100644
> --- a/drivers/dma/sun6i-dma.c
> +++ b/drivers/dma/sun6i-dma.c
> @@ -69,14 +69,19 @@
>
>  #define DMA_CHAN_CUR_CFG	0x0c
>  #define DMA_CHAN_MAX_DRQ_A31		0x1f
> +#define DMA_CHAN_MAX_DRQ_H6		0x3f
>  #define DMA_CHAN_CFG_SRC_DRQ_A31(x)	((x) & DMA_CHAN_MAX_DRQ_A31)
> +#define DMA_CHAN_CFG_SRC_DRQ_H6(x)	((x) & DMA_CHAN_MAX_DRQ_H6)
>  #define DMA_CHAN_CFG_SRC_MODE_A31(x)	(((x) & 0x1) << 5)
> +#define DMA_CHAN_CFG_SRC_MODE_H6(x)	(((x) & 0x1) << 8)
>  #define DMA_CHAN_CFG_SRC_BURST_A31(x)	(((x) & 0x3) << 7)
>  #define DMA_CHAN_CFG_SRC_BURST_H3(x)	(((x) & 0x3) << 6)
>  #define DMA_CHAN_CFG_SRC_WIDTH(x)	(((x) & 0x3) << 9)
>
>  #define DMA_CHAN_CFG_DST_DRQ_A31(x)	(DMA_CHAN_CFG_SRC_DRQ_A31(x) << 16)
> +#define DMA_CHAN_CFG_DST_DRQ_H6(x)	(DMA_CHAN_CFG_SRC_DRQ_H6(x) << 16)
>  #define DMA_CHAN_CFG_DST_MODE_A31(x)	(DMA_CHAN_CFG_SRC_MODE_A31(x) << 16)
> +#define DMA_CHAN_CFG_DST_MODE_H6(x)	(DMA_CHAN_CFG_SRC_MODE_H6(x) << 16)
>  #define DMA_CHAN_CFG_DST_BURST_A31(x)	(DMA_CHAN_CFG_SRC_BURST_A31(x) << 16)
>  #define DMA_CHAN_CFG_DST_BURST_H3(x)	(DMA_CHAN_CFG_SRC_BURST_H3(x) << 16)
>  #define DMA_CHAN_CFG_DST_WIDTH(x)	(DMA_CHAN_CFG_SRC_WIDTH(x) << 16)
> @@ -319,12 +324,24 @@ static void sun6i_set_drq_a31(u32 *p_cfg, s8 src_drq, s8 dst_drq)
>  		  DMA_CHAN_CFG_DST_DRQ_A31(dst_drq);
>  }
>
> +static void sun6i_set_drq_h6(u32 *p_cfg, s8 src_drq, s8 dst_drq)
> +{
> +	*p_cfg |= DMA_CHAN_CFG_SRC_DRQ_H6(src_drq) |
> +		  DMA_CHAN_CFG_DST_DRQ_H6(dst_drq);
> +}
> +
>  static void sun6i_set_mode_a31(u32 *p_cfg, s8 src_mode, s8 dst_mode)
>  {
>  	*p_cfg |= DMA_CHAN_CFG_SRC_MODE_A31(src_mode) |
>  		  DMA_CHAN_CFG_DST_MODE_A31(dst_mode);
>  }
>
> +static void sun6i_set_mode_h6(u32 *p_cfg, s8 src_mode, s8 dst_mode)
> +{
> +	*p_cfg |= DMA_CHAN_CFG_SRC_MODE_H6(src_mode) |
> +		  DMA_CHAN_CFG_DST_MODE_H6(dst_mode);
> +}
> +
>  static size_t sun6i_get_chan_size(struct sun6i_pchan *pchan)
>  {
>  	struct sun6i_desc *txd = pchan->desc;
> @@ -1160,6 +1177,28 @@ static struct sun6i_dma_config sun50i_a64_dma_cfg = {
>  			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
>  };
>
> +/*
> + * The H6 binding uses the number of dma channels from the
> + * device tree node.
> + */
> +static struct sun6i_dma_config sun50i_h6_dma_cfg = {
> +	.clock_autogate_enable = sun6i_enable_clock_autogate_h3,
> +	.set_burst_length = sun6i_set_burst_length_h3,
> +	.set_drq          = sun6i_set_drq_h6,
> +	.set_mode         = sun6i_set_mode_h6,
> +	.src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
> +	.dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
> +	.src_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
> +			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
> +			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
> +			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
> +	.dst_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
> +			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
> +			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
> +			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
> +	.has_mbus_clk = true,
> +};
> +
>  /*
>   * The V3s have only 8 physical channels, a maximum DRQ port id of 23,
>   * and a total of 24 usable source and destination endpoints.
> @@ -1190,6 +1229,7 @@ static const struct of_device_id sun6i_dma_match[] = {
>  	{ .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
>  	{ .compatible = "allwinner,sun8i-v3s-dma", .data = &sun8i_v3s_dma_cfg },
>  	{ .compatible = "allwinner,sun50i-a64-dma", .data = &sun50i_a64_dma_cfg },
> +	{ .compatible = "allwinner,sun50i-h6-dma", .data = &sun50i_h6_dma_cfg },
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, sun6i_dma_match);
> @@ -1288,8 +1328,8 @@ static int sun6i_dma_probe(struct platform_device *pdev)
>  	ret = of_property_read_u32(np, "dma-requests", &sdc->max_request);
>  	if (ret && !sdc->max_request) {
>  		dev_info(&pdev->dev, "Missing dma-requests, using %u.\n",
> -			 DMA_CHAN_MAX_DRQ_A31);
> -		sdc->max_request = DMA_CHAN_MAX_DRQ_A31;
> +			 DMA_CHAN_MAX_DRQ_H6);
> +		sdc->max_request = DMA_CHAN_MAX_DRQ_H6;

This is changing the binding though, since we're changing the
default. This should be reflected in the binding, and we should keep
the same default in the device tree binding.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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