sound/soc/xilinx/xlnx_i2s.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Xilinx ASoC I2S audio support
   4 //
   5 // Copyright (C) 2018 Xilinx, Inc.
   6 //
   7 // Author: Praveen Vuppala <praveenv@xilinx.com>
   8 // Author: Maruthi Srinivas Bayyavarapu <maruthis@xilinx.com>
   9
  10 #include <linux/io.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/platform_device.h>
  15 #include <sound/pcm_params.h>
  16 #include <sound/soc.h>
  17
  18 #define DRV_NAME "xlnx_i2s"
  19
  20 #define I2S_CORE_CTRL_OFFSET            0x08
  21 #define I2S_I2STIM_OFFSET               0x20
  22 #define I2S_CH0_OFFSET                  0x30
  23 #define I2S_I2STIM_VALID_MASK           GENMASK(7, 0)
  24
  25 static int xlnx_i2s_set_sclkout_div(struct snd_soc_dai *cpu_dai,
  26                                     int div_id, int div)
  27 {
  28         void __iomem *base = snd_soc_dai_get_drvdata(cpu_dai);
  29
  30         if (!div || (div & ~I2S_I2STIM_VALID_MASK))
  31                 return -EINVAL;
  32
  33         writel(div, base + I2S_I2STIM_OFFSET);
  34
  35         return 0;
  36 }
  37
  38 static int xlnx_i2s_hw_params(struct snd_pcm_substream *substream,
  39                               struct snd_pcm_hw_params *params,
  40                               struct snd_soc_dai *i2s_dai)
  41 {
  42         u32 reg_off, chan_id;
  43         void __iomem *base = snd_soc_dai_get_drvdata(i2s_dai);
  44
  45         chan_id = params_channels(params) / 2;
  46
  47         while (chan_id > 0) {
  48                 reg_off = I2S_CH0_OFFSET + ((chan_id - 1) * 4);
  49                 writel(chan_id, base + reg_off);
  50                 chan_id--;
  51         }
  52
  53         return 0;
  54 }
  55
  56 static int xlnx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
  57                             struct snd_soc_dai *i2s_dai)
  58 {
  59         void __iomem *base = snd_soc_dai_get_drvdata(i2s_dai);
  60
  61         switch (cmd) {
  62         case SNDRV_PCM_TRIGGER_START:
  63         case SNDRV_PCM_TRIGGER_RESUME:
  64         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  65                 writel(1, base + I2S_CORE_CTRL_OFFSET);
  66                 break;
  67         case SNDRV_PCM_TRIGGER_STOP:
  68         case SNDRV_PCM_TRIGGER_SUSPEND:
  69         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  70                 writel(0, base + I2S_CORE_CTRL_OFFSET);
  71                 break;
  72         default:
  73                 return -EINVAL;
  74         }
  75
  76         return 0;
  77 }
  78
  79 static const struct snd_soc_dai_ops xlnx_i2s_dai_ops = {
  80         .trigger = xlnx_i2s_trigger,
  81         .set_clkdiv = xlnx_i2s_set_sclkout_div,
  82         .hw_params = xlnx_i2s_hw_params
  83 };
  84
  85 static const struct snd_soc_component_driver xlnx_i2s_component = {
  86         .name = DRV_NAME,
  87 };
  88
  89 static const struct of_device_id xlnx_i2s_of_match[] = {
  90         { .compatible = "xlnx,i2s-transmitter-1.0", },
  91         { .compatible = "xlnx,i2s-receiver-1.0", },
  92         {},
  93 };
  94 MODULE_DEVICE_TABLE(of, xlnx_i2s_of_match);
  95
  96 static int xlnx_i2s_probe(struct platform_device *pdev)
  97 {
  98         struct resource *res;
  99         void __iomem *base;
 100         struct snd_soc_dai_driver *dai_drv;
 101         int ret;
 102         u32 ch, format, data_width;
 103         struct device *dev = &pdev->dev;
 104         struct device_node *node = dev->of_node;
 105
 106         dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL);
 107         if (!dai_drv)
 108                 return -ENOMEM;
 109
 110         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 111         base = devm_ioremap_resource(&pdev->dev, res);
 112         if (IS_ERR(base))
 113                 return PTR_ERR(base);
 114
 115         ret = of_property_read_u32(node, "xlnx,num-channels", &ch);
 116         if (ret < 0) {
 117                 dev_err(dev, "cannot get supported channels\n");
 118                 return ret;
 119         }
 120         ch = ch * 2;
 121
 122         ret = of_property_read_u32(node, "xlnx,dwidth", &data_width);
 123         if (ret < 0) {
 124                 dev_err(dev, "cannot get data width\n");
 125                 return ret;
 126         }
 127         switch (data_width) {
 128         case 16:
 129                 format = SNDRV_PCM_FMTBIT_S16_LE;
 130                 break;
 131         case 24:
 132                 format = SNDRV_PCM_FMTBIT_S24_LE;
 133                 break;
 134         default:
 135                 return -EINVAL;
 136         }
 137
 138         if (of_device_is_compatible(node, "xlnx,i2s-transmitter-1.0")) {
 139                 dai_drv->name = "xlnx_i2s_playback";
 140                 dai_drv->playback.stream_name = "Playback";
 141                 dai_drv->playback.formats = format;
 142                 dai_drv->playback.channels_min = ch;
 143                 dai_drv->playback.channels_max = ch;
 144                 dai_drv->playback.rates = SNDRV_PCM_RATE_8000_192000;
 145                 dai_drv->ops = &xlnx_i2s_dai_ops;
 146         } else if (of_device_is_compatible(node, "xlnx,i2s-receiver-1.0")) {
 147                 dai_drv->name = "xlnx_i2s_capture";
 148                 dai_drv->capture.stream_name = "Capture";
 149                 dai_drv->capture.formats = format;
 150                 dai_drv->capture.channels_min = ch;
 151                 dai_drv->capture.channels_max = ch;
 152                 dai_drv->capture.rates = SNDRV_PCM_RATE_8000_192000;
 153                 dai_drv->ops = &xlnx_i2s_dai_ops;
 154         } else {
 155                 return -ENODEV;
 156         }
 157
 158         dev_set_drvdata(&pdev->dev, base);
 159
 160         ret = devm_snd_soc_register_component(&pdev->dev, &xlnx_i2s_component,
 161                                               dai_drv, 1);
 162         if (ret) {
 163                 dev_err(&pdev->dev, "i2s component registration failed\n");
 164                 return ret;
 165         }
 166
 167         dev_info(&pdev->dev, "%s DAI registered\n", dai_drv->name);
 168
 169         return ret;
 170 }
 171
 172 static struct platform_driver xlnx_i2s_aud_driver = {
 173         .driver = {
 174                 .name = DRV_NAME,
 175                 .of_match_table = xlnx_i2s_of_match,
 176         },
 177         .probe = xlnx_i2s_probe,
 178 };
 179
 180 module_platform_driver(xlnx_i2s_aud_driver);
 181
 182 MODULE_LICENSE("GPL v2");
 183 MODULE_AUTHOR("Praveen Vuppala  <praveenv@xilinx.com>");
 184 MODULE_AUTHOR("Maruthi Srinivas Bayyavarapu <maruthis@xilinx.com>");