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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * omap-hdmi-audio.c -- OMAP4+ DSS HDMI audio support library4 *5 * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com6 *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 26struct 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 40static41struct 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 48static 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 63static 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 bytes71 */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 104static 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 word130 */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 mean182 * two different lengths. Hence, we need to specify the maximum183 * 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 else217 cea->db4_ca = 0x13;218 219 if (cea->db4_ca == 0x00)220 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PERMITTED;221 else222 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 230static 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 255static 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 269static 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 276static const struct snd_soc_component_driver omap_hdmi_component = {277 .name = "omapdss_hdmi",278 .legacy_dai_naming = 1,279};280 281static 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 295static 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 309static 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 392static struct platform_driver hdmi_audio_driver = {393 .driver = {394 .name = DRV_NAME,395 },396 .probe = omap_hdmi_audio_probe,397};398 399module_platform_driver(hdmi_audio_driver);400 401MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");402MODULE_DESCRIPTION("OMAP HDMI Audio Driver");403MODULE_LICENSE("GPL");404MODULE_ALIAS("platform:" DRV_NAME);405