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 --- a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
  19 +++ b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
  20 @@ -18,6 +18,11 @@ Required properties:
  21  - serial-dir : A list of serializer pin mode. The list number should be equal
  22                 to "num-serializer" parameter. Each entry is a number indication
  23                 serializer pin direction. (0 - INACTIVE, 1 - TX, 2 - RX)
  24 +- dmas: two element list of DMA controller phandles and DMA request line
  25 +        ordered pairs.
  26 +- dma-names: identifier string for each DMA request line in the dmas property.
  27 +            These strings correspond 1:1 with the ordered pairs in dmas. The dma
  28 +            identifiers must be "rx" and "tx".
  29
  30  Optional properties:
  31
  32 --- a/include/linux/platform_data/davinci_asp.h
  33 +++ b/include/linux/platform_data/davinci_asp.h
  34 @@ -84,6 +84,8 @@ struct snd_platform_data {
  35         u8 version;
  36         u8 txnumevt;
  37         u8 rxnumevt;
  38 +       int tx_dma_channel;
  39 +       int rx_dma_channel;
  40  };
  41
  42  enum {
  43 --- a/sound/soc/davinci/davinci-mcasp.c
  44 +++ b/sound/soc/davinci/davinci-mcasp.c
  45 @@ -1047,6 +1047,7 @@ static struct snd_platform_data *davinci
  46         struct snd_platform_data *pdata = NULL;
  47         const struct of_device_id *match =
  48                         of_match_device(mcasp_dt_ids, &pdev->dev);
  49 +       struct of_phandle_args dma_spec;
  50
  51         const u32 *of_serial_dir32;
  52         u8 *of_serial_dir;
  53 @@ -1109,6 +1110,28 @@ static struct snd_platform_data *davinci
  54                 pdata->serial_dir = of_serial_dir;
  55         }
  56
  57 +       ret = of_property_match_string(np, "dma-names", "tx");
  58 +       if (ret < 0)
  59 +               goto nodata;
  60 +
  61 +       ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", ret,
  62 +                                        &dma_spec);
  63 +       if (ret < 0)
  64 +               goto nodata;
  65 +
  66 +       pdata->tx_dma_channel = dma_spec.args[0];
  67 +
  68 +       ret = of_property_match_string(np, "dma-names", "rx");
  69 +       if (ret < 0)
  70 +               goto nodata;
  71 +
  72 +       ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", ret,
  73 +                                        &dma_spec);
  74 +       if (ret < 0)
  75 +               goto nodata;
  76 +
  77 +       pdata->rx_dma_channel = dma_spec.args[0];
  78 +
  79         ret = of_property_read_u32(np, "tx-num-evt", &val);
  80         if (ret >= 0)
  81                 pdata->txnumevt = val;
  82 @@ -1139,7 +1162,7 @@ nodata:
  83  static int davinci_mcasp_probe(struct platform_device *pdev)
  84  {
  85         struct davinci_pcm_dma_params *dma_data;
  86 -       struct resource *mem, *ioarea, *res;
  87 +       struct resource *mem, *ioarea, *res, *dma;
  88         struct snd_platform_data *pdata;
  89         struct davinci_audio_dev *dev;
  90         int ret;
  91 @@ -1213,15 +1236,11 @@ static int davinci_mcasp_probe(struct pl
  92         dma_data->sram_size = pdata->sram_size_playback;
  93         dma_data->dma_addr = dma->start + pdata->tx_dma_offset;
  94
  95 -       /* first TX, then RX */
  96         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
  97 -       if (!res) {
  98 -               dev_err(&pdev->dev, "no DMA resource\n");
  99 -               ret = -ENODEV;
 100 -               goto err_release_clk;
 101 -       }
 102 -
 103 -       dma_data->channel = res->start;
 104 +       if (res)
 105 +               dma_data->channel = res->start;
 106 +       else
 107 +               dma_data->channel = pdata->tx_dma_channel;
 108
 109         dma_data = &dev->dma_params[SNDRV_PCM_STREAM_CAPTURE];
 110         dma_data->asp_chan_q = pdata->asp_chan_q;
 111 @@ -1231,13 +1250,11 @@ static int davinci_mcasp_probe(struct pl
 112         dma_data->dma_addr = dma->start + pdata->rx_dma_offset;
 113
 114         res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 115 -       if (!res) {
 116 -               dev_err(&pdev->dev, "no DMA resource\n");
 117 -               ret = -ENODEV;
 118 -               goto err_release_clk;
 119 -       }
 120 +       if (res)
 121 +               dma_data->channel = res->start;
 122 +       else
 123 +               dma_data->channel = pdata->rx_dma_channel;
 124
 125 -       dma_data->channel = res->start;
 126         dev_set_drvdata(&pdev->dev, dev);
 127         ret = snd_soc_register_component(&pdev->dev, &davinci_mcasp_component,
 128                                          &davinci_mcasp_dai[pdata->op_mode], 1);