sound/soc/ti/omap-hdmi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * omap-hdmi-audio.c -- OMAP4+ DSS HDMI audio support library
   4  *
   5  * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com
   6  *
   7  * Author: Jyri Sarha <jsarha@ti.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/err.h>
  13 #include <linux/string.h>
  14 #include <linux/platform_device.h>
  15 #include <sound/soc.h>
  16 #include <sound/pcm_params.h>
  17 #include <sound/dmaengine_pcm.h>
  18 #include <uapi/sound/asound.h>
  19 #include <sound/asoundef.h>
  20 #include <sound/omap-hdmi-audio.h>
  21
  22 #include "sdma-pcm.h"
  23
  24 #define DRV_NAME "omap-hdmi-audio"
  25
  26 struct hdmi_audio_data {
  27         struct snd_soc_card *card;
  28
  29         const struct omap_hdmi_audio_ops *ops;
  30         struct device *dssdev;
  31         struct snd_dmaengine_dai_dma_data dma_data;
  32         struct omap_dss_audio dss_audio;
  33         struct snd_aes_iec958 iec;
  34         struct snd_cea_861_aud_if cea;
  35
  36         struct mutex current_stream_lock;
  37         struct snd_pcm_substream *current_stream;
  38 };
  39
  40 static
  41 struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
  42 {
  43         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(ss);
  44
  45         return snd_soc_card_get_drvdata(rtd->card);
  46 }
  47
  48 static void hdmi_dai_abort(struct device *dev)
  49 {
  50         struct hdmi_audio_data *ad = dev_get_drvdata(dev);
  51
  52         mutex_lock(&ad->current_stream_lock);
  53         if (ad->current_stream && ad->current_stream->runtime &&
  54             snd_pcm_running(ad->current_stream)) {
  55                 dev_err(dev, "HDMI display disabled, aborting playback\n");
  56                 snd_pcm_stream_lock_irq(ad->current_stream);
  57                 snd_pcm_stop(ad->current_stream, SNDRV_PCM_STATE_DISCONNECTED);
  58                 snd_pcm_stream_unlock_irq(ad->current_stream);
  59         }
  60         mutex_unlock(&ad->current_stream_lock);
  61 }
  62
  63 static int hdmi_dai_startup(struct snd_pcm_substream *substream,
  64                             struct snd_soc_dai *dai)
  65 {
  66         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
  67         int ret;
  68         /*
  69          * Make sure that the period bytes are multiple of the DMA packet size.
  70          * Largest packet size we use is 32 32-bit words = 128 bytes
  71          */
  72         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
  73                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
  74         if (ret < 0) {
  75                 dev_err(dai->dev, "Could not apply period constraint: %d\n",
  76                         ret);
  77                 return ret;
  78         }
  79         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
  80                                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
  81         if (ret < 0) {
  82                 dev_err(dai->dev, "Could not apply buffer constraint: %d\n",
  83                         ret);
  84                 return ret;
  85         }
  86
  87         snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
  88
  89         mutex_lock(&ad->current_stream_lock);
  90         ad->current_stream = substream;
  91         mutex_unlock(&ad->current_stream_lock);
  92
  93         ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);
  94
  95         if (ret) {
  96                 mutex_lock(&ad->current_stream_lock);
  97                 ad->current_stream = NULL;
  98                 mutex_unlock(&ad->current_stream_lock);
  99         }
 100
 101         return ret;
 102 }
 103
 104 static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
 105                               struct snd_pcm_hw_params *params,
 106                               struct snd_soc_dai *dai)
 107 {
 108         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 109         struct snd_aes_iec958 *iec = &ad->iec;
 110         struct snd_cea_861_aud_if *cea = &ad->cea;
 111
 112         WARN_ON(ad->current_stream != substream);
 113
 114         switch (params_format(params)) {
 115         case SNDRV_PCM_FORMAT_S16_LE:
 116                 ad->dma_data.maxburst = 16;
 117                 break;
 118         case SNDRV_PCM_FORMAT_S24_LE:
 119                 ad->dma_data.maxburst = 32;
 120                 break;
 121         default:
 122                 dev_err(dai->dev, "format not supported!\n");
 123                 return -EINVAL;
 124         }
 125
 126         ad->dss_audio.iec = iec;
 127         ad->dss_audio.cea = cea;
 128         /*
 129          * fill the IEC-60958 channel status word
 130          */
 131         /* initialize the word bytes */
 132         memset(iec->status, 0, sizeof(iec->status));
 133
 134         /* specify IEC-60958-3 (commercial use) */
 135         iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
 136
 137         /* specify that the audio is LPCM*/
 138         iec->status[0] &= ~IEC958_AES0_NONAUDIO;
 139
 140         iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
 141
 142         iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
 143
 144         iec->status[1] = IEC958_AES1_CON_GENERAL;
 145
 146         iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
 147
 148         iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
 149
 150         switch (params_rate(params)) {
 151         case 32000:
 152                 iec->status[3] |= IEC958_AES3_CON_FS_32000;
 153                 break;
 154         case 44100:
 155                 iec->status[3] |= IEC958_AES3_CON_FS_44100;
 156                 break;
 157         case 48000:
 158                 iec->status[3] |= IEC958_AES3_CON_FS_48000;
 159                 break;
 160         case 88200:
 161                 iec->status[3] |= IEC958_AES3_CON_FS_88200;
 162                 break;
 163         case 96000:
 164                 iec->status[3] |= IEC958_AES3_CON_FS_96000;
 165                 break;
 166         case 176400:
 167                 iec->status[3] |= IEC958_AES3_CON_FS_176400;
 168                 break;
 169         case 192000:
 170                 iec->status[3] |= IEC958_AES3_CON_FS_192000;
 171                 break;
 172         default:
 173                 dev_err(dai->dev, "rate not supported!\n");
 174                 return -EINVAL;
 175         }
 176
 177         /* specify the clock accuracy */
 178         iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
 179
 180         /*
 181          * specify the word length. The same word length value can mean
 182          * two different lengths. Hence, we need to specify the maximum
 183          * word length as well.
 184          */
 185         switch (params_format(params)) {
 186         case SNDRV_PCM_FORMAT_S16_LE:
 187                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
 188                 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
 189                 break;
 190         case SNDRV_PCM_FORMAT_S24_LE:
 191                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
 192                 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
 193                 break;
 194         default:
 195                 dev_err(dai->dev, "format not supported!\n");
 196                 return -EINVAL;
 197         }
 198
 199         /*
 200          * Fill the CEA-861 audio infoframe (see spec for details)
 201          */
 202
 203         cea->db1_ct_cc = (params_channels(params) - 1)
 204                 & CEA861_AUDIO_INFOFRAME_DB1CC;
 205         cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
 206
 207         cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
 208         cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
 209
 210         cea->db3 = 0; /* not used, all zeros */
 211
 212         if (params_channels(params) == 2)
 213                 cea->db4_ca = 0x0;
 214         else if (params_channels(params) == 6)
 215                 cea->db4_ca = 0xb;
 216         else
 217                 cea->db4_ca = 0x13;
 218
 219         if (cea->db4_ca == 0x00)
 220                 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PERMITTED;
 221         else
 222                 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
 223
 224         /* the expression is trivial but makes clear what we are doing */
 225         cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
 226
 227         return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
 228 }
 229
 230 static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 231                             struct snd_soc_dai *dai)
 232 {
 233         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 234         int err = 0;
 235
 236         WARN_ON(ad->current_stream != substream);
 237
 238         switch (cmd) {
 239         case SNDRV_PCM_TRIGGER_START:
 240         case SNDRV_PCM_TRIGGER_RESUME:
 241         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 242                 err = ad->ops->audio_start(ad->dssdev);
 243                 break;
 244         case SNDRV_PCM_TRIGGER_STOP:
 245         case SNDRV_PCM_TRIGGER_SUSPEND:
 246         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 247                 ad->ops->audio_stop(ad->dssdev);
 248                 break;
 249         default:
 250                 err = -EINVAL;
 251         }
 252         return err;
 253 }
 254
 255 static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
 256                               struct snd_soc_dai *dai)
 257 {
 258         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 259
 260         WARN_ON(ad->current_stream != substream);
 261
 262         ad->ops->audio_shutdown(ad->dssdev);
 263
 264         mutex_lock(&ad->current_stream_lock);
 265         ad->current_stream = NULL;
 266         mutex_unlock(&ad->current_stream_lock);
 267 }
 268
 269 static const struct snd_soc_dai_ops hdmi_dai_ops = {
 270         .startup        = hdmi_dai_startup,
 271         .hw_params      = hdmi_dai_hw_params,
 272         .trigger        = hdmi_dai_trigger,
 273         .shutdown       = hdmi_dai_shutdown,
 274 };
 275
 276 static const struct snd_soc_component_driver omap_hdmi_component = {
 277         .name = "omapdss_hdmi",
 278         .legacy_dai_naming = 1,
 279 };
 280
 281 static struct snd_soc_dai_driver omap5_hdmi_dai = {
 282         .name = "omap5-hdmi-dai",
 283         .playback = {
 284                 .channels_min = 2,
 285                 .channels_max = 8,
 286                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 287                           SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
 288                           SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
 289                           SNDRV_PCM_RATE_192000),
 290                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 291         },
 292         .ops = &hdmi_dai_ops,
 293 };
 294
 295 static struct snd_soc_dai_driver omap4_hdmi_dai = {
 296         .name = "omap4-hdmi-dai",
 297         .playback = {
 298                 .channels_min = 2,
 299                 .channels_max = 8,
 300                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
 301                           SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
 302                           SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
 303                           SNDRV_PCM_RATE_192000),
 304                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
 305         },
 306         .ops = &hdmi_dai_ops,
 307 };
 308
 309 static int omap_hdmi_audio_probe(struct platform_device *pdev)
 310 {
 311         struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
 312         struct device *dev = &pdev->dev;
 313         struct hdmi_audio_data *ad;
 314         struct snd_soc_dai_driver *dai_drv;
 315         struct snd_soc_card *card;
 316         struct snd_soc_dai_link_component *compnent;
 317         int ret;
 318
 319         if (!ha) {
 320                 dev_err(dev, "No platform data\n");
 321                 return -EINVAL;
 322         }
 323
 324         ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
 325         if (!ad)
 326                 return -ENOMEM;
 327         ad->dssdev = ha->dev;
 328         ad->ops = ha->ops;
 329         ad->dma_data.addr = ha->audio_dma_addr;
 330         ad->dma_data.filter_data = "audio_tx";
 331         ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 332         mutex_init(&ad->current_stream_lock);
 333
 334         switch (ha->version) {
 335         case 4:
 336                 dai_drv = &omap4_hdmi_dai;
 337                 break;
 338         case 5:
 339                 dai_drv = &omap5_hdmi_dai;
 340                 break;
 341         default:
 342                 return -EINVAL;
 343         }
 344         ret = devm_snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
 345                                          dai_drv, 1);
 346         if (ret)
 347                 return ret;
 348
 349         ret = sdma_pcm_platform_register(ad->dssdev, "audio_tx", NULL);
 350         if (ret)
 351                 return ret;
 352
 353         card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
 354         if (!card)
 355                 return -ENOMEM;
 356
 357         card->name = "HDMI";
 358         card->owner = THIS_MODULE;
 359         card->dai_link =
 360                 devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
 361         if (!card->dai_link)
 362                 return -ENOMEM;
 363
 364         compnent = devm_kzalloc(dev, sizeof(*compnent), GFP_KERNEL);
 365         if (!compnent)
 366                 return -ENOMEM;
 367         card->dai_link->cpus            = compnent;
 368         card->dai_link->num_cpus        = 1;
 369         card->dai_link->codecs          = &snd_soc_dummy_dlc;
 370         card->dai_link->num_codecs      = 1;
 371
 372         card->dai_link->name = card->name;
 373         card->dai_link->stream_name = card->name;
 374         card->dai_link->cpus->dai_name = dev_name(ad->dssdev);
 375         card->num_links = 1;
 376         card->dev = dev;
 377
 378         ret = devm_snd_soc_register_card(dev, card);
 379         if (ret) {
 380                 dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
 381                 return ret;
 382         }
 383
 384         ad->card = card;
 385         snd_soc_card_set_drvdata(card, ad);
 386
 387         dev_set_drvdata(dev, ad);
 388
 389         return 0;
 390 }
 391
 392 static struct platform_driver hdmi_audio_driver = {
 393         .driver = {
 394                 .name = DRV_NAME,
 395         },
 396         .probe = omap_hdmi_audio_probe,
 397 };
 398
 399 module_platform_driver(hdmi_audio_driver);
 400
 401 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
 402 MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
 403 MODULE_LICENSE("GPL");
 404 MODULE_ALIAS("platform:" DRV_NAME);