linux-kernel - Re: [PATCH 14/14] dmaengine: dma350: Support ARM DMA-250

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Message-ID: <8995c33a-8ff2-4fec-8849-73f18d04a3ab@kernel.org>
Date: Sat, 23 Aug 2025 18:13:14 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jisheng Zhang <jszhang@...nel.org>, Vinod Koul <vkoul@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Robin Murphy <robin.murphy@....com>
Cc: dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/14] dmaengine: dma350: Support ARM DMA-250

On 23/08/2025 17:40, Jisheng Zhang wrote:
>  	struct device *dev = &pdev->dev;
> @@ -893,8 +1262,9 @@ static int d350_probe(struct platform_device *pdev)
>  	r = FIELD_GET(IIDR_VARIANT, reg);
>  	p = FIELD_GET(IIDR_REVISION, reg);
>  	if (FIELD_GET(IIDR_IMPLEMENTER, reg) != IMPLEMENTER_ARM ||
> -	    FIELD_GET(IIDR_PRODUCTID, reg) != PRODUCTID_DMA350)
> -		return dev_err_probe(dev, -ENODEV, "Not a DMA-350!");
> +	    ((FIELD_GET(IIDR_PRODUCTID, reg) != PRODUCTID_DMA350) &&
> +	    FIELD_GET(IIDR_PRODUCTID, reg) != PRODUCTID_DMA250))
> +		return dev_err_probe(dev, -ENODEV, "Not a DMA-350/DMA-250!");
>  
>  	reg = readl_relaxed(base + DMAINFO + DMA_BUILDCFG0);
>  	nchan = FIELD_GET(DMA_CFG_NUM_CHANNELS, reg) + 1;
> @@ -917,13 +1287,38 @@ static int d350_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> +	if (device_is_compatible(dev, "arm,dma-250")) {

No, don't sprinkle compatibles through driver code. driver match data is
for that.

> +		u32 cfg2;
> +		int secext_present;
> +
> +		dmac->is_d250 = true;
> +
> +		cfg2 = readl_relaxed(base + DMAINFO + DMA_BUILDCFG2);
> +		secext_present = (cfg2 & DMA_CFG_HAS_TZ) ? 1 : 0;
> +		dmac->cntx_mem_size = nchan * 64 * (1 + secext_present);
> +		dmac->cntx_mem = dma_alloc_coherent(dev, dmac->cntx_mem_size,
> +						    &dmac->cntx_mem_paddr,
> +						    GFP_KERNEL);
> +		if (!dmac->cntx_mem)
> +			return dev_err_probe(dev, -ENOMEM, "Failed to alloc context memory\n");
> +
> +		ret = devm_add_action_or_reset(dev, d250_cntx_mem_release, dmac);
> +		if (ret) {
> +			dma_free_coherent(dev, dmac->cntx_mem_size,
> +					  dmac->cntx_mem, dmac->cntx_mem_paddr);
> +			return ret;
> +		}
> +		writel_relaxed(dmac->cntx_mem_paddr, base + DMANSECCTRL + NSEC_CNTXBASE);
> +	}
> +
>  	dma_set_mask_and_coherent(dev, DMA_BIT_MASK(aw));
>  	coherent = device_get_dma_attr(dev) == DEV_DMA_COHERENT;
>  
>  	reg = readl_relaxed(base + DMAINFO + DMA_BUILDCFG1);
>  	dmac->nreq = FIELD_GET(DMA_CFG_NUM_TRIGGER_IN, reg);
>  
> -	dev_dbg(dev, "DMA-350 r%dp%d with %d channels, %d requests\n", r, p, dmac->nchan, dmac->nreq);
> +	dev_info(dev, "%s r%dp%d with %d channels, %d requests\n",
> +		 dmac->is_d250 ? "DMA-250" : "DMA-350", r, p, dmac->nchan, dmac->nreq);

No, don't makek drivers more verbose. Please follow Linux driver
design/coding style - this should be silent on success.

>  
>  	for (int i = min(dw, 16); i > 0; i /= 2) {
>  		dmac->dma.src_addr_widths |= BIT(i);
> @@ -935,7 +1330,10 @@ static int d350_probe(struct platform_device *pdev)
>  	dmac->dma.device_alloc_chan_resources = d350_alloc_chan_resources;
>  	dmac->dma.device_free_chan_resources = d350_free_chan_resources;
>  	dma_cap_set(DMA_MEMCPY, dmac->dma.cap_mask);
> -	dmac->dma.device_prep_dma_memcpy = d350_prep_memcpy;
> +	if (dmac->is_d250)
> +		dmac->dma.device_prep_dma_memcpy = d250_prep_memcpy;
> +	else
> +		dmac->dma.device_prep_dma_memcpy = d350_prep_memcpy;
>  	dmac->dma.device_pause = d350_pause;
>  	dmac->dma.device_resume = d350_resume;
>  	dmac->dma.device_terminate_all = d350_terminate_all;
> @@ -971,8 +1369,8 @@ static int d350_probe(struct platform_device *pdev)
>  			return dch->irq;
>  
>  		dch->has_wrap = FIELD_GET(CH_CFG_HAS_WRAP, reg);
> -		dch->has_trig = FIELD_GET(CH_CFG_HAS_TRIGIN, reg) &
> -				FIELD_GET(CH_CFG_HAS_TRIGSEL, reg);
> +		dch->has_xsizehi = FIELD_GET(CH_CFG_HAS_XSIZEHI, reg);
> +		dch->has_trig = FIELD_GET(CH_CFG_HAS_TRIGIN, reg);
>  
>  		/* Fill is a special case of Wrap */
>  		memset &= dch->has_wrap;
> @@ -994,8 +1392,13 @@ static int d350_probe(struct platform_device *pdev)
>  		dma_cap_set(DMA_SLAVE, dmac->dma.cap_mask);
>  		dma_cap_set(DMA_CYCLIC, dmac->dma.cap_mask);
>  		dmac->dma.device_config = d350_slave_config;
> -		dmac->dma.device_prep_slave_sg = d350_prep_slave_sg;
> -		dmac->dma.device_prep_dma_cyclic = d350_prep_cyclic;
> +		if (dmac->is_d250) {
> +			dmac->dma.device_prep_slave_sg = d250_prep_slave_sg;
> +			dmac->dma.device_prep_dma_cyclic = d250_prep_cyclic;
> +		} else {
> +			dmac->dma.device_prep_slave_sg = d350_prep_slave_sg;
> +			dmac->dma.device_prep_dma_cyclic = d350_prep_cyclic;
> +		}
>  	}
>  
>  	if (memset) {
> @@ -1019,6 +1422,7 @@ static void d350_remove(struct platform_device *pdev)
>  
>  static const struct of_device_id d350_of_match[] __maybe_unused = {
>  	{ .compatible = "arm,dma-350" },
> +	{ .compatible = "arm,dma-250" },

And based on that devices would be compatible...

BTW, incorrect order - 2 < 3.



Best regards,
Krzysztof