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); 405