target/linux/omap/patches-3.12/403-ASoC-davinci-mcasp-Extract-DMA-channels-directly-fro.patch

   1 From ad5d3e5a1218a599ec02c81a3bd599acedeea00f Mon Sep 17 00:00:00 2001
   2 From: Jyri Sarha <jsarha@ti.com>
   3 Date: Tue, 17 Sep 2013 12:09:30 +0300
   4 Subject: [PATCH 214/752] ASoC: davinci-mcasp: Extract DMA channels directly
   5  from DT
   6
   7 Extract DMA channels directly from DT as they can not be found from
   8 platform resources anymore. This is a work-around until davinci audio
   9 driver is updated to use dmaengine.
  10
  11 Signed-off-by: Jyri Sarha <jsarha@ti.com>
  12 ---
  13  .../bindings/sound/davinci-mcasp-audio.txt         |    5 +++
  14  include/linux/platform_data/davinci_asp.h          |    2 +
  15  sound/soc/davinci/davinci-mcasp.c                  |   47 +++++++++++++-------
  16  3 files changed, 39 insertions(+), 15 deletions(-)
  17
  18 diff --git a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
  19 index 63b67ae..68e0f47 100644
  20 --- a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
  21 +++ b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
  22 @@ -18,6 +18,11 @@ Required properties:
  23  - serial-dir : A list of serializer pin mode. The list number should be equal
  24                 to "num-serializer" parameter. Each entry is a number indication
  25                 serializer pin direction. (0 - INACTIVE, 1 - TX, 2 - RX)
  26 +- dmas: two element list of DMA controller phandles and DMA request line
  27 +        ordered pairs.
  28 +- dma-names: identifier string for each DMA request line in the dmas property.
  29 +            These strings correspond 1:1 with the ordered pairs in dmas. The dma
  30 +            identifiers must be "rx" and "tx".
  31
  32  Optional properties:
  33
  34 diff --git a/include/linux/platform_data/davinci_asp.h b/include/linux/platform_data/davinci_asp.h
  35 index 8db5ae0..689a856 100644
  36 --- a/include/linux/platform_data/davinci_asp.h
  37 +++ b/include/linux/platform_data/davinci_asp.h
  38 @@ -84,6 +84,8 @@ struct snd_platform_data {
  39         u8 version;
  40         u8 txnumevt;
  41         u8 rxnumevt;
  42 +       int tx_dma_channel;
  43 +       int rx_dma_channel;
  44  };
  45
  46  enum {
  47 diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
  48 index a056fc5..acbf5f8 100644
  49 --- a/sound/soc/davinci/davinci-mcasp.c
  50 +++ b/sound/soc/davinci/davinci-mcasp.c
  51 @@ -1047,6 +1047,7 @@ static struct snd_platform_data *davinci_mcasp_set_pdata_from_of(
  52         struct snd_platform_data *pdata = NULL;
  53         const struct of_device_id *match =
  54                         of_match_device(mcasp_dt_ids, &pdev->dev);
  55 +       struct of_phandle_args dma_spec;
  56
  57         const u32 *of_serial_dir32;
  58         u8 *of_serial_dir;
  59 @@ -1109,6 +1110,28 @@ static struct snd_platform_data *davinci_mcasp_set_pdata_from_of(
  60                 pdata->serial_dir = of_serial_dir;
  61         }
  62
  63 +       ret = of_property_match_string(np, "dma-names", "tx");
  64 +       if (ret < 0)
  65 +               goto nodata;
  66 +
  67 +       ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", ret,
  68 +                                        &dma_spec);
  69 +       if (ret < 0)
  70 +               goto nodata;
  71 +
  72 +       pdata->tx_dma_channel = dma_spec.args[0];
  73 +
  74 +       ret = of_property_match_string(np, "dma-names", "rx");
  75 +       if (ret < 0)
  76 +               goto nodata;
  77 +
  78 +       ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", ret,
  79 +                                        &dma_spec);
  80 +       if (ret < 0)
  81 +               goto nodata;
  82 +
  83 +       pdata->rx_dma_channel = dma_spec.args[0];
  84 +
  85         ret = of_property_read_u32(np, "tx-num-evt", &val);
  86         if (ret >= 0)
  87                 pdata->txnumevt = val;
  88 @@ -1139,7 +1162,7 @@ nodata:
  89  static int davinci_mcasp_probe(struct platform_device *pdev)
  90  {
  91         struct davinci_pcm_dma_params *dma_data;
  92 -       struct resource *mem, *ioarea, *res;
  93 +       struct resource *mem, *ioarea, *res, *dma;
  94         struct snd_platform_data *pdata;
  95         struct davinci_audio_dev *dev;
  96         int ret;
  97 @@ -1213,15 +1236,11 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
  98         dma_data->sram_size = pdata->sram_size_playback;
  99         dma_data->dma_addr = dma->start + pdata->tx_dma_offset;
 100
 101 -       /* first TX, then RX */
 102         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 103 -       if (!res) {
 104 -               dev_err(&pdev->dev, "no DMA resource\n");
 105 -               ret = -ENODEV;
 106 -               goto err_release_clk;
 107 -       }
 108 -
 109 -       dma_data->channel = res->start;
 110 +       if (res)
 111 +               dma_data->channel = res->start;
 112 +       else
 113 +               dma_data->channel = pdata->tx_dma_channel;
 114
 115         dma_data = &dev->dma_params[SNDRV_PCM_STREAM_CAPTURE];
 116         dma_data->asp_chan_q = pdata->asp_chan_q;
 117 @@ -1231,13 +1250,11 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
 118         dma_data->dma_addr = dma->start + pdata->rx_dma_offset;
 119
 120         res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 121 -       if (!res) {
 122 -               dev_err(&pdev->dev, "no DMA resource\n");
 123 -               ret = -ENODEV;
 124 -               goto err_release_clk;
 125 -       }
 126 +       if (res)
 127 +               dma_data->channel = res->start;
 128 +       else
 129 +               dma_data->channel = pdata->rx_dma_channel;
 130
 131 -       dma_data->channel = res->start;
 132         dev_set_drvdata(&pdev->dev, dev);
 133         ret = snd_soc_register_component(&pdev->dev, &davinci_mcasp_component,
 134                                          &davinci_mcasp_dai[pdata->op_mode], 1);
 135 --
 136 1.7.10.4
 137