Commit cd31b807 authored by Robert Jarzmik's avatar Robert Jarzmik
Browse files

ARM: pxa: change SSP DMA channels allocation 



Now the dma_slave_map is available for PXA architecture, switch the SSP
device to it.

This specifically means that :
- for platform data based machines, the DMA requestor channels are
  extracted from the slave map, where pxa-ssp-dai.<N> is a 1-1 match to
  ssp.<N>, and the channels are either "rx" or "tx".

- for device tree platforms, the dma node should be hooked into the
  pxa2xx-ac97 or pxa-ssp-dai node.

Signed-off-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
Acked-by: default avatarDaniel Mack <daniel@zonque.org>
parent b77ed2e6

arch/arm/plat-pxa/ssp.c

+0 −47
Original line number Diff line number Diff line
@@ -127,53 +127,6 @@ static int pxa_ssp_probe(struct platform_device *pdev) 
	if (IS_ERR(ssp->clk))

		return PTR_ERR(ssp->clk);



	if (dev->of_node) {

		struct of_phandle_args dma_spec;

		struct device_node *np = dev->of_node;

		int ret;



		/*

		 * FIXME: we should allocate the DMA channel from this

		 * context and pass the channel down to the ssp users.

		 * For now, we lookup the rx and tx indices manually

		 */



		/* rx */

		ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",

						 0, &dma_spec);



		if (ret) {

			dev_err(dev, "Can't parse dmas property\n");

			return -ENODEV;

		}

		ssp->drcmr_rx = dma_spec.args[0];

		of_node_put(dma_spec.np);



		/* tx */

		ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",

						 1, &dma_spec);

		if (ret) {

			dev_err(dev, "Can't parse dmas property\n");

			return -ENODEV;

		}

		ssp->drcmr_tx = dma_spec.args[0];

		of_node_put(dma_spec.np);

	} else {

		res = platform_get_resource(pdev, IORESOURCE_DMA, 0);

		if (res == NULL) {

			dev_err(dev, "no SSP RX DRCMR defined\n");

			return -ENODEV;

		}

		ssp->drcmr_rx = res->start;



		res = platform_get_resource(pdev, IORESOURCE_DMA, 1);

		if (res == NULL) {

			dev_err(dev, "no SSP TX DRCMR defined\n");

			return -ENODEV;

		}

		ssp->drcmr_tx = res->start;

	}



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (res == NULL) {

		dev_err(dev, "no memory resource defined\n");

include/linux/pxa2xx_ssp.h

+0 −2
Original line number Diff line number Diff line
@@ -212,8 +212,6 @@ struct ssp_device { 
	int		type;

	int		use_count;

	int		irq;

	int		drcmr_rx;

	int		drcmr_tx;



	struct device_node	*of_node;

};

sound/soc/pxa/pxa-ssp.c

+2 −3
Original line number Diff line number Diff line
@@ -105,9 +105,8 @@ static int pxa_ssp_startup(struct snd_pcm_substream *substream, 
	dma = kzalloc(sizeof(struct snd_dmaengine_dai_dma_data), GFP_KERNEL);

	if (!dma)

		return -ENOMEM;



	dma->filter_data = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?

				&ssp->drcmr_tx : &ssp->drcmr_rx;

	dma->chan_name = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?

		"tx" : "rx";



	snd_soc_dai_set_dma_data(cpu_dai, substream, dma);

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