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 - http://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
card_drvdata_substream(struct snd_pcm_substream * ss)41 struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
42 {
43 struct snd_soc_pcm_runtime *rtd = ss->private_data;
44
45 return snd_soc_card_get_drvdata(rtd->card);
46 }
47
hdmi_dai_abort(struct device * dev)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
hdmi_dai_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)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
hdmi_dai_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)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
hdmi_dai_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)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
hdmi_dai_shutdown(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)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 };
279
280 static struct snd_soc_dai_driver omap5_hdmi_dai = {
281 .name = "omap5-hdmi-dai",
282 .playback = {
283 .channels_min = 2,
284 .channels_max = 8,
285 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
286 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
287 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
288 SNDRV_PCM_RATE_192000),
289 .formats = SNDRV_PCM_FMTBIT_S16_LE,
290 },
291 .ops = &hdmi_dai_ops,
292 };
293
294 static struct snd_soc_dai_driver omap4_hdmi_dai = {
295 .name = "omap4-hdmi-dai",
296 .playback = {
297 .channels_min = 2,
298 .channels_max = 8,
299 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
300 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
301 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
302 SNDRV_PCM_RATE_192000),
303 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
304 },
305 .ops = &hdmi_dai_ops,
306 };
307
omap_hdmi_audio_probe(struct platform_device * pdev)308 static int omap_hdmi_audio_probe(struct platform_device *pdev)
309 {
310 struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
311 struct device *dev = &pdev->dev;
312 struct hdmi_audio_data *ad;
313 struct snd_soc_dai_driver *dai_drv;
314 struct snd_soc_card *card;
315 struct snd_soc_dai_link_component *compnent;
316 int ret;
317
318 if (!ha) {
319 dev_err(dev, "No platform data\n");
320 return -EINVAL;
321 }
322
323 ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
324 if (!ad)
325 return -ENOMEM;
326 ad->dssdev = ha->dev;
327 ad->ops = ha->ops;
328 ad->dma_data.addr = ha->audio_dma_addr;
329 ad->dma_data.filter_data = "audio_tx";
330 ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
331 mutex_init(&ad->current_stream_lock);
332
333 switch (ha->version) {
334 case 4:
335 dai_drv = &omap4_hdmi_dai;
336 break;
337 case 5:
338 dai_drv = &omap5_hdmi_dai;
339 break;
340 default:
341 return -EINVAL;
342 }
343 ret = devm_snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
344 dai_drv, 1);
345 if (ret)
346 return ret;
347
348 ret = sdma_pcm_platform_register(ad->dssdev, "audio_tx", NULL);
349 if (ret)
350 return ret;
351
352 card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
353 if (!card)
354 return -ENOMEM;
355
356 card->name = devm_kasprintf(dev, GFP_KERNEL,
357 "HDMI %s", dev_name(ad->dssdev));
358 if (!card->name)
359 return -ENOMEM;
360
361 card->owner = THIS_MODULE;
362 card->dai_link =
363 devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
364 if (!card->dai_link)
365 return -ENOMEM;
366
367 compnent = devm_kzalloc(dev, 3 * sizeof(*compnent), GFP_KERNEL);
368 if (!compnent)
369 return -ENOMEM;
370 card->dai_link->cpus = &compnent[0];
371 card->dai_link->num_cpus = 1;
372 card->dai_link->codecs = &compnent[1];
373 card->dai_link->num_codecs = 1;
374 card->dai_link->platforms = &compnent[2];
375 card->dai_link->num_platforms = 1;
376
377 card->dai_link->name = card->name;
378 card->dai_link->stream_name = card->name;
379 card->dai_link->cpus->dai_name = dev_name(ad->dssdev);
380 card->dai_link->platforms->name = dev_name(ad->dssdev);
381 card->dai_link->codecs->name = "snd-soc-dummy";
382 card->dai_link->codecs->dai_name = "snd-soc-dummy-dai";
383 card->num_links = 1;
384 card->dev = dev;
385
386 ret = snd_soc_register_card(card);
387 if (ret) {
388 dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
389 return ret;
390 }
391
392 ad->card = card;
393 snd_soc_card_set_drvdata(card, ad);
394
395 dev_set_drvdata(dev, ad);
396
397 return 0;
398 }
399
omap_hdmi_audio_remove(struct platform_device * pdev)400 static int omap_hdmi_audio_remove(struct platform_device *pdev)
401 {
402 struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
403
404 snd_soc_unregister_card(ad->card);
405 return 0;
406 }
407
408 static struct platform_driver hdmi_audio_driver = {
409 .driver = {
410 .name = DRV_NAME,
411 },
412 .probe = omap_hdmi_audio_probe,
413 .remove = omap_hdmi_audio_remove,
414 };
415
416 module_platform_driver(hdmi_audio_driver);
417
418 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
419 MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
420 MODULE_LICENSE("GPL");
421 MODULE_ALIAS("platform:" DRV_NAME);
422
