sound/soc/samsung/snow.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // ASoC machine driver for Snow boards
   4
   5 #include <linux/clk.h>
   6 #include <linux/module.h>
   7 #include <linux/platform_device.h>
   8 #include <linux/of.h>
   9 #include <linux/of_device.h>
  10 #include <sound/pcm_params.h>
  11 #include <sound/soc.h>
  12
  13 #include "i2s.h"
  14
  15 #define FIN_PLL_RATE            24000000
  16
  17 SND_SOC_DAILINK_DEFS(links,
  18         DAILINK_COMP_ARRAY(COMP_EMPTY()),
  19         DAILINK_COMP_ARRAY(COMP_EMPTY()),
  20         DAILINK_COMP_ARRAY(COMP_EMPTY()));
  21
  22 struct snow_priv {
  23         struct snd_soc_dai_link dai_link;
  24         struct clk *clk_i2s_bus;
  25 };
  26
  27 static int snow_card_hw_params(struct snd_pcm_substream *substream,
  28                                       struct snd_pcm_hw_params *params)
  29 {
  30         static const unsigned int pll_rate[] = {
  31                 73728000U, 67737602U, 49152000U, 45158401U, 32768001U
  32         };
  33         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  34         struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card);
  35         int bfs, psr, rfs, bitwidth;
  36         unsigned long int rclk;
  37         long int freq = -EINVAL;
  38         int ret, i;
  39
  40         bitwidth = snd_pcm_format_width(params_format(params));
  41         if (bitwidth < 0) {
  42                 dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth);
  43                 return bitwidth;
  44         }
  45
  46         if (bitwidth != 16 && bitwidth != 24) {
  47                 dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth);
  48                 return -EINVAL;
  49         }
  50
  51         bfs = 2 * bitwidth;
  52
  53         switch (params_rate(params)) {
  54         case 16000:
  55         case 22050:
  56         case 24000:
  57         case 32000:
  58         case 44100:
  59         case 48000:
  60         case 88200:
  61         case 96000:
  62                 rfs = 8 * bfs;
  63                 break;
  64         case 64000:
  65                 rfs = 384;
  66                 break;
  67         case 8000:
  68         case 11025:
  69         case 12000:
  70                 rfs = 16 * bfs;
  71                 break;
  72         default:
  73                 return -EINVAL;
  74         }
  75
  76         rclk = params_rate(params) * rfs;
  77
  78         for (psr = 8; psr > 0; psr /= 2) {
  79                 for (i = 0; i < ARRAY_SIZE(pll_rate); i++) {
  80                         if ((pll_rate[i] - rclk * psr) <= 2) {
  81                                 freq = pll_rate[i];
  82                                 break;
  83                         }
  84                 }
  85         }
  86         if (freq < 0) {
  87                 dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk);
  88                 return -EINVAL;
  89         }
  90
  91         ret = clk_set_rate(priv->clk_i2s_bus, freq);
  92         if (ret < 0) {
  93                 dev_err(rtd->card->dev, "I2S bus clock rate set failed\n");
  94                 return ret;
  95         }
  96
  97         return 0;
  98 }
  99
 100 static const struct snd_soc_ops snow_card_ops = {
 101         .hw_params = snow_card_hw_params,
 102 };
 103
 104 static int snow_late_probe(struct snd_soc_card *card)
 105 {
 106         struct snd_soc_pcm_runtime *rtd;
 107         struct snd_soc_dai *codec_dai;
 108
 109         rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
 110
 111         /* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */
 112         if (rtd->num_codecs > 1)
 113                 codec_dai = rtd->codec_dais[0];
 114         else
 115                 codec_dai = rtd->codec_dai;
 116
 117         /* Set the MCLK rate for the codec */
 118         return snd_soc_dai_set_sysclk(codec_dai, 0,
 119                                 FIN_PLL_RATE, SND_SOC_CLOCK_IN);
 120 }
 121
 122 static struct snd_soc_card snow_snd = {
 123         .name = "Snow-I2S",
 124         .owner = THIS_MODULE,
 125         .late_probe = snow_late_probe,
 126 };
 127
 128 static int snow_probe(struct platform_device *pdev)
 129 {
 130         struct device *dev = &pdev->dev;
 131         struct snd_soc_card *card = &snow_snd;
 132         struct device_node *cpu, *codec;
 133         struct snd_soc_dai_link *link;
 134         struct snow_priv *priv;
 135         int ret;
 136
 137         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 138         if (!priv)
 139                 return -ENOMEM;
 140
 141         link = &priv->dai_link;
 142
 143         link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 144                         SND_SOC_DAIFMT_CBS_CFS;
 145
 146         link->name = "Primary";
 147         link->stream_name = link->name;
 148
 149         link->cpus = links_cpus;
 150         link->num_cpus = ARRAY_SIZE(links_cpus);
 151         link->codecs = links_codecs;
 152         link->num_codecs = ARRAY_SIZE(links_codecs);
 153         link->platforms = links_platforms;
 154         link->num_platforms = ARRAY_SIZE(links_platforms);
 155
 156         card->dai_link = link;
 157         card->num_links = 1;
 158         card->dev = dev;
 159
 160         /* Try new DT bindings with HDMI support first. */
 161         cpu = of_get_child_by_name(dev->of_node, "cpu");
 162
 163         if (cpu) {
 164                 link->ops = &snow_card_ops;
 165
 166                 link->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0);
 167                 of_node_put(cpu);
 168
 169                 if (!link->cpus->of_node) {
 170                         dev_err(dev, "Failed parsing cpu/sound-dai property\n");
 171                         return -EINVAL;
 172                 }
 173
 174                 codec = of_get_child_by_name(dev->of_node, "codec");
 175                 ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
 176                 of_node_put(codec);
 177
 178                 if (ret < 0) {
 179                         of_node_put(link->cpus->of_node);
 180                         dev_err(dev, "Failed parsing codec node\n");
 181                         return ret;
 182                 }
 183
 184                 priv->clk_i2s_bus = of_clk_get_by_name(link->cpus->of_node,
 185                                                        "i2s_opclk0");
 186                 if (IS_ERR(priv->clk_i2s_bus)) {
 187                         snd_soc_of_put_dai_link_codecs(link);
 188                         of_node_put(link->cpus->of_node);
 189                         return PTR_ERR(priv->clk_i2s_bus);
 190                 }
 191         } else {
 192                 link->codecs->dai_name = "HiFi",
 193
 194                 link->cpus->of_node = of_parse_phandle(dev->of_node,
 195                                                 "samsung,i2s-controller", 0);
 196                 if (!link->cpus->of_node) {
 197                         dev_err(dev, "i2s-controller property parse error\n");
 198                         return -EINVAL;
 199                 }
 200
 201                 link->codecs->of_node = of_parse_phandle(dev->of_node,
 202                                                 "samsung,audio-codec", 0);
 203                 if (!link->codecs->of_node) {
 204                         of_node_put(link->cpus->of_node);
 205                         dev_err(dev, "audio-codec property parse error\n");
 206                         return -EINVAL;
 207                 }
 208         }
 209
 210         link->platforms->of_node = link->cpus->of_node;
 211
 212         /* Update card-name if provided through DT, else use default name */
 213         snd_soc_of_parse_card_name(card, "samsung,model");
 214
 215         snd_soc_card_set_drvdata(card, priv);
 216
 217         ret = devm_snd_soc_register_card(dev, card);
 218         if (ret) {
 219                 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
 220                 return ret;
 221         }
 222
 223         return ret;
 224 }
 225
 226 static int snow_remove(struct platform_device *pdev)
 227 {
 228         struct snow_priv *priv = platform_get_drvdata(pdev);
 229         struct snd_soc_dai_link *link = &priv->dai_link;
 230
 231         of_node_put(link->cpus->of_node);
 232         of_node_put(link->codecs->of_node);
 233         snd_soc_of_put_dai_link_codecs(link);
 234
 235         clk_put(priv->clk_i2s_bus);
 236
 237         return 0;
 238 }
 239
 240 static const struct of_device_id snow_of_match[] = {
 241         { .compatible = "google,snow-audio-max98090", },
 242         { .compatible = "google,snow-audio-max98091", },
 243         { .compatible = "google,snow-audio-max98095", },
 244         {},
 245 };
 246 MODULE_DEVICE_TABLE(of, snow_of_match);
 247
 248 static struct platform_driver snow_driver = {
 249         .driver = {
 250                 .name = "snow-audio",
 251                 .pm = &snd_soc_pm_ops,
 252                 .of_match_table = snow_of_match,
 253         },
 254         .probe = snow_probe,
 255         .remove = snow_remove,
 256 };
 257
 258 module_platform_driver(snow_driver);
 259
 260 MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
 261 MODULE_LICENSE("GPL");