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