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Linux/sound/soc/fsl/imx-audmix.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright 2017 NXP
  4  *
  5  * The code contained herein is licensed under the GNU General Public
  6  * License. You may obtain a copy of the GNU General Public License
  7  * Version 2 or later at the following locations:
  8  *
  9  * http://www.opensource.org/licenses/gpl-license.html
 10  * http://www.gnu.org/copyleft/gpl.html
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/of_platform.h>
 15 #include <linux/clk.h>
 16 #include <sound/soc.h>
 17 #include <sound/soc-dapm.h>
 18 #include <linux/pm_runtime.h>
 19 #include "fsl_sai.h"
 20 #include "fsl_audmix.h"
 21 
 22 struct imx_audmix {
 23         struct platform_device *pdev;
 24         struct snd_soc_card card;
 25         struct platform_device *audmix_pdev;
 26         struct platform_device *out_pdev;
 27         struct clk *cpu_mclk;
 28         int num_dai;
 29         struct snd_soc_dai_link *dai;
 30         int num_dai_conf;
 31         struct snd_soc_codec_conf *dai_conf;
 32         int num_dapm_routes;
 33         struct snd_soc_dapm_route *dapm_routes;
 34 };
 35 
 36 static const u32 imx_audmix_rates[] = {
 37         8000, 12000, 16000, 24000, 32000, 48000, 64000, 96000,
 38 };
 39 
 40 static const struct snd_pcm_hw_constraint_list imx_audmix_rate_constraints = {
 41         .count = ARRAY_SIZE(imx_audmix_rates),
 42         .list = imx_audmix_rates,
 43 };
 44 
 45 static int imx_audmix_fe_startup(struct snd_pcm_substream *substream)
 46 {
 47         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 48         struct imx_audmix *priv = snd_soc_card_get_drvdata(rtd->card);
 49         struct snd_pcm_runtime *runtime = substream->runtime;
 50         struct device *dev = rtd->card->dev;
 51         unsigned long clk_rate = clk_get_rate(priv->cpu_mclk);
 52         int ret;
 53 
 54         if (clk_rate % 24576000 == 0) {
 55                 ret = snd_pcm_hw_constraint_list(runtime, 0,
 56                                                  SNDRV_PCM_HW_PARAM_RATE,
 57                                                  &imx_audmix_rate_constraints);
 58                 if (ret < 0)
 59                         return ret;
 60         } else {
 61                 dev_warn(dev, "mclk may be not supported %lu\n", clk_rate);
 62         }
 63 
 64         ret = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
 65                                            1, 8);
 66         if (ret < 0)
 67                 return ret;
 68 
 69         return snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT,
 70                                             FSL_AUDMIX_FORMATS);
 71 }
 72 
 73 static int imx_audmix_fe_hw_params(struct snd_pcm_substream *substream,
 74                                    struct snd_pcm_hw_params *params)
 75 {
 76         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 77         struct device *dev = rtd->card->dev;
 78         bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 79         unsigned int fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF;
 80         u32 channels = params_channels(params);
 81         int ret, dir;
 82 
 83         /* For playback the AUDMIX is slave, and for record is master */
 84         fmt |= tx ? SND_SOC_DAIFMT_CBS_CFS : SND_SOC_DAIFMT_CBM_CFM;
 85         dir  = tx ? SND_SOC_CLOCK_OUT : SND_SOC_CLOCK_IN;
 86 
 87         /* set DAI configuration */
 88         ret = snd_soc_dai_set_fmt(rtd->cpu_dai, fmt);
 89         if (ret) {
 90                 dev_err(dev, "failed to set cpu dai fmt: %d\n", ret);
 91                 return ret;
 92         }
 93 
 94         ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, FSL_SAI_CLK_MAST1, 0, dir);
 95         if (ret) {
 96                 dev_err(dev, "failed to set cpu sysclk: %d\n", ret);
 97                 return ret;
 98         }
 99 
100         /*
101          * Per datasheet, AUDMIX expects 8 slots and 32 bits
102          * for every slot in TDM mode.
103          */
104         ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, BIT(channels) - 1,
105                                        BIT(channels) - 1, 8, 32);
106         if (ret)
107                 dev_err(dev, "failed to set cpu dai tdm slot: %d\n", ret);
108 
109         return ret;
110 }
111 
112 static int imx_audmix_be_hw_params(struct snd_pcm_substream *substream,
113                                    struct snd_pcm_hw_params *params)
114 {
115         struct snd_soc_pcm_runtime *rtd = substream->private_data;
116         struct device *dev = rtd->card->dev;
117         bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
118         unsigned int fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF;
119         int ret;
120 
121         if (!tx)
122                 return 0;
123 
124         /* For playback the AUDMIX is slave */
125         fmt |= SND_SOC_DAIFMT_CBM_CFM;
126 
127         /* set AUDMIX DAI configuration */
128         ret = snd_soc_dai_set_fmt(rtd->cpu_dai, fmt);
129         if (ret)
130                 dev_err(dev, "failed to set AUDMIX DAI fmt: %d\n", ret);
131 
132         return ret;
133 }
134 
135 static struct snd_soc_ops imx_audmix_fe_ops = {
136         .startup = imx_audmix_fe_startup,
137         .hw_params = imx_audmix_fe_hw_params,
138 };
139 
140 static struct snd_soc_ops imx_audmix_be_ops = {
141         .hw_params = imx_audmix_be_hw_params,
142 };
143 
144 static int imx_audmix_probe(struct platform_device *pdev)
145 {
146         struct device_node *np = pdev->dev.of_node;
147         struct device_node *audmix_np = NULL, *out_cpu_np = NULL;
148         struct platform_device *audmix_pdev = NULL;
149         struct platform_device *cpu_pdev;
150         struct of_phandle_args args;
151         struct imx_audmix *priv;
152         int i, num_dai, ret;
153         const char *fe_name_pref = "HiFi-AUDMIX-FE-";
154         char *be_name, *be_pb, *be_cp, *dai_name, *capture_dai_name;
155 
156         if (pdev->dev.parent) {
157                 audmix_np = pdev->dev.parent->of_node;
158         } else {
159                 dev_err(&pdev->dev, "Missing parent device.\n");
160                 return -EINVAL;
161         }
162 
163         if (!audmix_np) {
164                 dev_err(&pdev->dev, "Missing DT node for parent device.\n");
165                 return -EINVAL;
166         }
167 
168         audmix_pdev = of_find_device_by_node(audmix_np);
169         if (!audmix_pdev) {
170                 dev_err(&pdev->dev, "Missing AUDMIX platform device for %s\n",
171                         np->full_name);
172                 return -EINVAL;
173         }
174         put_device(&audmix_pdev->dev);
175 
176         num_dai = of_count_phandle_with_args(audmix_np, "dais", NULL);
177         if (num_dai != FSL_AUDMIX_MAX_DAIS) {
178                 dev_err(&pdev->dev, "Need 2 dais to be provided for %s\n",
179                         audmix_np->full_name);
180                 return -EINVAL;
181         }
182 
183         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
184         if (!priv)
185                 return -ENOMEM;
186 
187         priv->num_dai = 2 * num_dai;
188         priv->dai = devm_kzalloc(&pdev->dev, priv->num_dai *
189                                  sizeof(struct snd_soc_dai_link), GFP_KERNEL);
190         if (!priv->dai)
191                 return -ENOMEM;
192 
193         priv->num_dai_conf = num_dai;
194         priv->dai_conf = devm_kzalloc(&pdev->dev, priv->num_dai_conf *
195                                       sizeof(struct snd_soc_codec_conf),
196                                       GFP_KERNEL);
197         if (!priv->dai_conf)
198                 return -ENOMEM;
199 
200         priv->num_dapm_routes = 3 * num_dai;
201         priv->dapm_routes = devm_kzalloc(&pdev->dev, priv->num_dapm_routes *
202                                          sizeof(struct snd_soc_dapm_route),
203                                          GFP_KERNEL);
204         if (!priv->dapm_routes)
205                 return -ENOMEM;
206 
207         for (i = 0; i < num_dai; i++) {
208                 struct snd_soc_dai_link_component *dlc;
209 
210                 /* for CPU/Codec/Platform x 2 */
211                 dlc = devm_kzalloc(&pdev->dev, 6 * sizeof(*dlc), GFP_KERNEL);
212                 if (!dlc) {
213                         dev_err(&pdev->dev, "failed to allocate dai_link\n");
214                         return -ENOMEM;
215                 }
216 
217                 ret = of_parse_phandle_with_args(audmix_np, "dais", NULL, i,
218                                                  &args);
219                 if (ret < 0) {
220                         dev_err(&pdev->dev, "of_parse_phandle_with_args failed\n");
221                         return ret;
222                 }
223 
224                 cpu_pdev = of_find_device_by_node(args.np);
225                 if (!cpu_pdev) {
226                         dev_err(&pdev->dev, "failed to find SAI platform device\n");
227                         return -EINVAL;
228                 }
229                 put_device(&cpu_pdev->dev);
230 
231                 dai_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s%s",
232                                           fe_name_pref, args.np->full_name + 1);
233 
234                 dev_info(pdev->dev.parent, "DAI FE name:%s\n", dai_name);
235 
236                 if (i == 0) {
237                         out_cpu_np = args.np;
238                         capture_dai_name =
239                                 devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s %s",
240                                                dai_name, "CPU-Capture");
241                 }
242 
243                 priv->dai[i].cpus = &dlc[0];
244                 priv->dai[i].codecs = &dlc[1];
245                 priv->dai[i].platforms = &dlc[2];
246 
247                 priv->dai[i].num_cpus = 1;
248                 priv->dai[i].num_codecs = 1;
249                 priv->dai[i].num_platforms = 1;
250 
251                 priv->dai[i].name = dai_name;
252                 priv->dai[i].stream_name = "HiFi-AUDMIX-FE";
253                 priv->dai[i].codecs->dai_name = "snd-soc-dummy-dai";
254                 priv->dai[i].codecs->name = "snd-soc-dummy";
255                 priv->dai[i].cpus->of_node = args.np;
256                 priv->dai[i].cpus->dai_name = dev_name(&cpu_pdev->dev);
257                 priv->dai[i].platforms->of_node = args.np;
258                 priv->dai[i].dynamic = 1;
259                 priv->dai[i].dpcm_playback = 1;
260                 priv->dai[i].dpcm_capture = (i == 0 ? 1 : 0);
261                 priv->dai[i].ignore_pmdown_time = 1;
262                 priv->dai[i].ops = &imx_audmix_fe_ops;
263 
264                 /* Add AUDMIX Backend */
265                 be_name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
266                                          "audmix-%d", i);
267                 be_pb = devm_kasprintf(&pdev->dev, GFP_KERNEL,
268                                        "AUDMIX-Playback-%d", i);
269                 be_cp = devm_kasprintf(&pdev->dev, GFP_KERNEL,
270                                        "AUDMIX-Capture-%d", i);
271 
272                 priv->dai[num_dai + i].cpus = &dlc[3];
273                 priv->dai[num_dai + i].codecs = &dlc[4];
274                 priv->dai[num_dai + i].platforms = &dlc[5];
275 
276                 priv->dai[num_dai + i].num_cpus = 1;
277                 priv->dai[num_dai + i].num_codecs = 1;
278                 priv->dai[num_dai + i].num_platforms = 1;
279 
280                 priv->dai[num_dai + i].name = be_name;
281                 priv->dai[num_dai + i].codecs->dai_name = "snd-soc-dummy-dai";
282                 priv->dai[num_dai + i].codecs->name = "snd-soc-dummy";
283                 priv->dai[num_dai + i].cpus->of_node = audmix_np;
284                 priv->dai[num_dai + i].cpus->dai_name = be_name;
285                 priv->dai[num_dai + i].platforms->name = "snd-soc-dummy";
286                 priv->dai[num_dai + i].no_pcm = 1;
287                 priv->dai[num_dai + i].dpcm_playback = 1;
288                 priv->dai[num_dai + i].dpcm_capture  = 1;
289                 priv->dai[num_dai + i].ignore_pmdown_time = 1;
290                 priv->dai[num_dai + i].ops = &imx_audmix_be_ops;
291 
292                 priv->dai_conf[i].of_node = args.np;
293                 priv->dai_conf[i].name_prefix = dai_name;
294 
295                 priv->dapm_routes[i].source =
296                         devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s %s",
297                                        dai_name, "CPU-Playback");
298                 priv->dapm_routes[i].sink = be_pb;
299                 priv->dapm_routes[num_dai + i].source   = be_pb;
300                 priv->dapm_routes[num_dai + i].sink     = be_cp;
301                 priv->dapm_routes[2 * num_dai + i].source = be_cp;
302                 priv->dapm_routes[2 * num_dai + i].sink   = capture_dai_name;
303         }
304 
305         cpu_pdev = of_find_device_by_node(out_cpu_np);
306         if (!cpu_pdev) {
307                 dev_err(&pdev->dev, "failed to find SAI platform device\n");
308                 return -EINVAL;
309         }
310         put_device(&cpu_pdev->dev);
311 
312         priv->cpu_mclk = devm_clk_get(&cpu_pdev->dev, "mclk1");
313         if (IS_ERR(priv->cpu_mclk)) {
314                 ret = PTR_ERR(priv->cpu_mclk);
315                 dev_err(&cpu_pdev->dev, "failed to get DAI mclk1: %d\n", ret);
316                 return -EINVAL;
317         }
318 
319         priv->audmix_pdev = audmix_pdev;
320         priv->out_pdev  = cpu_pdev;
321 
322         priv->card.dai_link = priv->dai;
323         priv->card.num_links = priv->num_dai;
324         priv->card.codec_conf = priv->dai_conf;
325         priv->card.num_configs = priv->num_dai_conf;
326         priv->card.dapm_routes = priv->dapm_routes;
327         priv->card.num_dapm_routes = priv->num_dapm_routes;
328         priv->card.dev = pdev->dev.parent;
329         priv->card.owner = THIS_MODULE;
330         priv->card.name = "imx-audmix";
331 
332         platform_set_drvdata(pdev, &priv->card);
333         snd_soc_card_set_drvdata(&priv->card, priv);
334 
335         ret = devm_snd_soc_register_card(pdev->dev.parent, &priv->card);
336         if (ret) {
337                 dev_err(&pdev->dev, "snd_soc_register_card failed\n");
338                 return ret;
339         }
340 
341         return ret;
342 }
343 
344 static struct platform_driver imx_audmix_driver = {
345         .probe = imx_audmix_probe,
346         .driver = {
347                 .name = "imx-audmix",
348                 .pm = &snd_soc_pm_ops,
349         },
350 };
351 module_platform_driver(imx_audmix_driver);
352 
353 MODULE_DESCRIPTION("NXP AUDMIX ASoC machine driver");
354 MODULE_AUTHOR("Viorel Suman <viorel.suman@nxp.com>");
355 MODULE_ALIAS("platform:imx-audmix");
356 MODULE_LICENSE("GPL v2");
357 

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