sound/soc/samsung/odroid.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (C) 2017 Samsung Electronics Co., Ltd.
   4
   5 #include <linux/clk.h>
   6 #include <linux/clk-provider.h>
   7 #include <linux/of.h>
   8 #include <linux/module.h>
   9 #include <sound/soc.h>
  10 #include <sound/pcm_params.h>
  11 #include "i2s.h"
  12 #include "i2s-regs.h"
  13
  14 struct odroid_priv {
  15         struct snd_soc_card card;
  16         struct clk *clk_i2s_bus;
  17         struct clk *sclk_i2s;
  18
  19         /* Spinlock protecting fields below */
  20         spinlock_t lock;
  21         unsigned int be_sample_rate;
  22         bool be_active;
  23 };
  24
  25 static int odroid_card_fe_startup(struct snd_pcm_substream *substream)
  26 {
  27         struct snd_pcm_runtime *runtime = substream->runtime;
  28
  29         snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
  30
  31         return 0;
  32 }
  33
  34 static int odroid_card_fe_hw_params(struct snd_pcm_substream *substream,
  35                                       struct snd_pcm_hw_params *params)
  36 {
  37         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
  38         struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
  39         unsigned long flags;
  40         int ret = 0;
  41
  42         spin_lock_irqsave(&priv->lock, flags);
  43         if (priv->be_active && priv->be_sample_rate != params_rate(params))
  44                 ret = -EINVAL;
  45         spin_unlock_irqrestore(&priv->lock, flags);
  46
  47         return ret;
  48 }
  49
  50 static const struct snd_soc_ops odroid_card_fe_ops = {
  51         .startup = odroid_card_fe_startup,
  52         .hw_params = odroid_card_fe_hw_params,
  53 };
  54
  55 static int odroid_card_be_hw_params(struct snd_pcm_substream *substream,
  56                                       struct snd_pcm_hw_params *params)
  57 {
  58         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
  59         struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
  60         unsigned int pll_freq, rclk_freq, rfs;
  61         unsigned long flags;
  62         int ret;
  63
  64         switch (params_rate(params)) {
  65         case 64000:
  66                 pll_freq = 196608001U;
  67                 rfs = 384;
  68                 break;
  69         case 44100:
  70         case 88200:
  71                 pll_freq = 180633609U;
  72                 rfs = 512;
  73                 break;
  74         case 32000:
  75         case 48000:
  76         case 96000:
  77                 pll_freq = 196608001U;
  78                 rfs = 512;
  79                 break;
  80         default:
  81                 return -EINVAL;
  82         }
  83
  84         ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
  85         if (ret < 0)
  86                 return ret;
  87
  88         /*
  89          *  We add 2 to the rclk_freq value in order to avoid too low clock
  90          *  frequency values due to the EPLL output frequency not being exact
  91          *  multiple of the audio sampling rate.
  92          */
  93         rclk_freq = params_rate(params) * rfs + 2;
  94
  95         ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
  96         if (ret < 0)
  97                 return ret;
  98
  99         if (rtd->dai_link->num_codecs > 1) {
 100                 struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 1);
 101
 102                 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
 103                                              SND_SOC_CLOCK_IN);
 104                 if (ret < 0)
 105                         return ret;
 106         }
 107
 108         spin_lock_irqsave(&priv->lock, flags);
 109         priv->be_sample_rate = params_rate(params);
 110         spin_unlock_irqrestore(&priv->lock, flags);
 111
 112         return 0;
 113 }
 114
 115 static int odroid_card_be_trigger(struct snd_pcm_substream *substream, int cmd)
 116 {
 117         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 118         struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
 119         unsigned long flags;
 120
 121         spin_lock_irqsave(&priv->lock, flags);
 122
 123         switch (cmd) {
 124         case SNDRV_PCM_TRIGGER_START:
 125         case SNDRV_PCM_TRIGGER_RESUME:
 126         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 127                 priv->be_active = true;
 128                 break;
 129
 130         case SNDRV_PCM_TRIGGER_STOP:
 131         case SNDRV_PCM_TRIGGER_SUSPEND:
 132         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 133                 priv->be_active = false;
 134                 break;
 135         }
 136
 137         spin_unlock_irqrestore(&priv->lock, flags);
 138
 139         return 0;
 140 }
 141
 142 static const struct snd_soc_ops odroid_card_be_ops = {
 143         .hw_params = odroid_card_be_hw_params,
 144         .trigger = odroid_card_be_trigger,
 145 };
 146
 147 /* DAPM routes for backward compatibility with old DTS */
 148 static const struct snd_soc_dapm_route odroid_dapm_routes[] = {
 149         { "I2S Playback", NULL, "Mixer DAI TX" },
 150         { "HiFi Playback", NULL, "Mixer DAI TX" },
 151 };
 152
 153 SND_SOC_DAILINK_DEFS(primary,
 154         DAILINK_COMP_ARRAY(COMP_EMPTY()),
 155         DAILINK_COMP_ARRAY(COMP_DUMMY()),
 156         DAILINK_COMP_ARRAY(COMP_PLATFORM("3830000.i2s")));
 157
 158 SND_SOC_DAILINK_DEFS(mixer,
 159         DAILINK_COMP_ARRAY(COMP_DUMMY()),
 160         DAILINK_COMP_ARRAY(COMP_EMPTY()));
 161
 162 SND_SOC_DAILINK_DEFS(secondary,
 163         DAILINK_COMP_ARRAY(COMP_EMPTY()),
 164         DAILINK_COMP_ARRAY(COMP_DUMMY()),
 165         DAILINK_COMP_ARRAY(COMP_PLATFORM("3830000.i2s-sec")));
 166
 167 static struct snd_soc_dai_link odroid_card_dais[] = {
 168         {
 169                 /* Primary FE <-> BE link */
 170                 .ops = &odroid_card_fe_ops,
 171                 .name = "Primary",
 172                 .stream_name = "Primary",
 173                 .dynamic = 1,
 174                 .playback_only = 1,
 175                 SND_SOC_DAILINK_REG(primary),
 176         }, {
 177                 /* BE <-> CODECs link */
 178                 .name = "I2S Mixer",
 179                 .ops = &odroid_card_be_ops,
 180                 .no_pcm = 1,
 181                 .playback_only = 1,
 182                 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 183                                 SND_SOC_DAIFMT_CBS_CFS,
 184                 SND_SOC_DAILINK_REG(mixer),
 185         }, {
 186                 /* Secondary FE <-> BE link */
 187                 .ops = &odroid_card_fe_ops,
 188                 .name = "Secondary",
 189                 .stream_name = "Secondary",
 190                 .dynamic = 1,
 191                 .playback_only = 1,
 192                 SND_SOC_DAILINK_REG(secondary),
 193         }
 194 };
 195
 196 static int odroid_audio_probe(struct platform_device *pdev)
 197 {
 198         struct device *dev = &pdev->dev;
 199         struct device_node *cpu_dai = NULL;
 200         struct device_node *cpu, *codec;
 201         struct odroid_priv *priv;
 202         struct snd_soc_card *card;
 203         struct snd_soc_dai_link *link, *codec_link;
 204         int num_pcms, ret, i;
 205
 206         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 207         if (!priv)
 208                 return -ENOMEM;
 209
 210         card = &priv->card;
 211         card->dev = dev;
 212
 213         card->owner = THIS_MODULE;
 214         card->fully_routed = true;
 215
 216         spin_lock_init(&priv->lock);
 217         snd_soc_card_set_drvdata(card, priv);
 218
 219         ret = snd_soc_of_parse_card_name(card, "model");
 220         if (ret < 0)
 221                 return ret;
 222
 223         if (of_property_present(dev->of_node, "samsung,audio-widgets")) {
 224                 ret = snd_soc_of_parse_audio_simple_widgets(card,
 225                                                 "samsung,audio-widgets");
 226                 if (ret < 0)
 227                         return ret;
 228         }
 229
 230         ret = 0;
 231         if (of_property_present(dev->of_node, "audio-routing"))
 232                 ret = snd_soc_of_parse_audio_routing(card, "audio-routing");
 233         else if (of_property_present(dev->of_node, "samsung,audio-routing"))
 234                 ret = snd_soc_of_parse_audio_routing(card, "samsung,audio-routing");
 235         if (ret < 0)
 236                 return ret;
 237
 238         card->dai_link = odroid_card_dais;
 239         card->num_links = ARRAY_SIZE(odroid_card_dais);
 240
 241         cpu = of_get_child_by_name(dev->of_node, "cpu");
 242         codec = of_get_child_by_name(dev->of_node, "codec");
 243         link = card->dai_link;
 244         codec_link = &card->dai_link[1];
 245
 246         /*
 247          * For backwards compatibility create the secondary CPU DAI link only
 248          * if there are 2 CPU DAI entries in the cpu sound-dai property in DT.
 249          * Also add required DAPM routes not available in old DTS.
 250          */
 251         num_pcms = of_count_phandle_with_args(cpu, "sound-dai",
 252                                               "#sound-dai-cells");
 253         if (num_pcms == 1) {
 254                 card->dapm_routes = odroid_dapm_routes;
 255                 card->num_dapm_routes = ARRAY_SIZE(odroid_dapm_routes);
 256                 card->num_links--;
 257         }
 258
 259         for (i = 0; i < num_pcms; i++, link += 2) {
 260                 ret = snd_soc_of_get_dai_name(cpu, &link->cpus->dai_name, i);
 261                 if (ret < 0)
 262                         break;
 263         }
 264         if (ret == 0) {
 265                 cpu_dai = of_parse_phandle(cpu, "sound-dai", 0);
 266                 if (!cpu_dai)
 267                         ret = -EINVAL;
 268         }
 269
 270         of_node_put(cpu);
 271         if (ret < 0)
 272                 goto err_put_node;
 273
 274         ret = snd_soc_of_get_dai_link_codecs(dev, codec, codec_link);
 275         if (ret < 0)
 276                 goto err_put_cpu_dai;
 277
 278         /* Set capture capability only for boards with the MAX98090 CODEC */
 279         if (codec_link->num_codecs > 1) {
 280                 card->dai_link[0].playback_only = 0;
 281                 card->dai_link[1].playback_only = 0;
 282         }
 283
 284         priv->sclk_i2s = of_clk_get_by_name(cpu_dai, "i2s_opclk1");
 285         if (IS_ERR(priv->sclk_i2s)) {
 286                 ret = PTR_ERR(priv->sclk_i2s);
 287                 goto err_put_cpu_dai;
 288         }
 289
 290         priv->clk_i2s_bus = of_clk_get_by_name(cpu_dai, "iis");
 291         if (IS_ERR(priv->clk_i2s_bus)) {
 292                 ret = PTR_ERR(priv->clk_i2s_bus);
 293                 goto err_put_sclk;
 294         }
 295
 296         ret = devm_snd_soc_register_card(dev, card);
 297         if (ret < 0) {
 298                 dev_err_probe(dev, ret, "snd_soc_register_card() failed\n");
 299                 goto err_put_clk_i2s;
 300         }
 301
 302         of_node_put(cpu_dai);
 303         of_node_put(codec);
 304         return 0;
 305
 306 err_put_clk_i2s:
 307         clk_put(priv->clk_i2s_bus);
 308 err_put_sclk:
 309         clk_put(priv->sclk_i2s);
 310 err_put_cpu_dai:
 311         of_node_put(cpu_dai);
 312         snd_soc_of_put_dai_link_codecs(codec_link);
 313 err_put_node:
 314         of_node_put(codec);
 315         return ret;
 316 }
 317
 318 static void odroid_audio_remove(struct platform_device *pdev)
 319 {
 320         struct odroid_priv *priv = platform_get_drvdata(pdev);
 321
 322         snd_soc_of_put_dai_link_codecs(&priv->card.dai_link[1]);
 323         clk_put(priv->sclk_i2s);
 324         clk_put(priv->clk_i2s_bus);
 325 }
 326
 327 static const struct of_device_id odroid_audio_of_match[] = {
 328         { .compatible   = "hardkernel,odroid-xu3-audio" },
 329         { .compatible   = "hardkernel,odroid-xu4-audio" },
 330         { .compatible   = "samsung,odroid-xu3-audio" },
 331         { .compatible   = "samsung,odroid-xu4-audio" },
 332         { },
 333 };
 334 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
 335
 336 static struct platform_driver odroid_audio_driver = {
 337         .driver = {
 338                 .name           = "odroid-audio",
 339                 .of_match_table = odroid_audio_of_match,
 340                 .pm             = &snd_soc_pm_ops,
 341         },
 342         .probe  = odroid_audio_probe,
 343         .remove = odroid_audio_remove,
 344 };
 345 module_platform_driver(odroid_audio_driver);
 346
 347 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 348 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
 349 MODULE_LICENSE("GPL v2");