1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (C) 2017 Samsung Electronics Co., Ltd.
4
5 #include <linux/clk.h>
6 #include <linux/clk-provider.h>
7 #include <linux/of.h>
8 #include <linux/module.h>
9 #include <sound/soc.h>
10 #include <sound/pcm_params.h>
11 #include "i2s.h"
12 #include "i2s-regs.h"
13
14 struct odroid_priv {
15 struct snd_soc_card card;
16 struct clk *clk_i2s_bus;
17 struct clk *sclk_i2s;
18
19 /* Spinlock protecting fields below */
20 spinlock_t lock;
21 unsigned int be_sample_rate;
22 bool be_active;
23 };
24
25 static int odroid_card_fe_startup(struct snd_pcm_substream *substream)
26 {
27 struct snd_pcm_runtime *runtime = substream->runtime;
28
29 snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
30
31 return 0;
32 }
33
34 static int odroid_card_fe_hw_params(struct snd_pcm_substream *substream,
35 struct snd_pcm_hw_params *params)
36 {
37 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
38 struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
39 unsigned long flags;
40 int ret = 0;
41
42 spin_lock_irqsave(&priv->lock, flags);
43 if (priv->be_active && priv->be_sample_rate != params_rate(params))
44 ret = -EINVAL;
45 spin_unlock_irqrestore(&priv->lock, flags);
46
47 return ret;
48 }
49
50 static const struct snd_soc_ops odroid_card_fe_ops = {
51 .startup = odroid_card_fe_startup,
52 .hw_params = odroid_card_fe_hw_params,
53 };
54
55 static int odroid_card_be_hw_params(struct snd_pcm_substream *substream,
56 struct snd_pcm_hw_params *params)
57 {
58 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
59 struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
60 unsigned int pll_freq, rclk_freq, rfs;
61 unsigned long flags;
62 int ret;
63
64 switch (params_rate(params)) {
65 case 64000:
66 pll_freq = 196608001U;
67 rfs = 384;
68 break;
69 case 44100:
70 case 88200:
71 pll_freq = 180633609U;
72 rfs = 512;
73 break;
74 case 32000:
75 case 48000:
76 case 96000:
77 pll_freq = 196608001U;
78 rfs = 512;
79 break;
80 default:
81 return -EINVAL;
82 }
83
84 ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
85 if (ret < 0)
86 return ret;
87
88 /*
89 * We add 2 to the rclk_freq value in order to avoid too low clock
90 * frequency values due to the EPLL output frequency not being exact
91 * multiple of the audio sampling rate.
92 */
93 rclk_freq = params_rate(params) * rfs + 2;
94
95 ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
96 if (ret < 0)
97 return ret;
98
99 if (rtd->dai_link->num_codecs > 1) {
100 struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 1);
101
102 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
103 SND_SOC_CLOCK_IN);
104 if (ret < 0)
105 return ret;
106 }
107
108 spin_lock_irqsave(&priv->lock, flags);
109 priv->be_sample_rate = params_rate(params);
110 spin_unlock_irqrestore(&priv->lock, flags);
111
112 return 0;
113 }
114
115 static int odroid_card_be_trigger(struct snd_pcm_substream *substream, int cmd)
116 {
117 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
118 struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
119 unsigned long flags;
120
121 spin_lock_irqsave(&priv->lock, flags);
122
123 switch (cmd) {
124 case SNDRV_PCM_TRIGGER_START:
125 case SNDRV_PCM_TRIGGER_RESUME:
126 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
127 priv->be_active = true;
128 break;
129
130 case SNDRV_PCM_TRIGGER_STOP:
131 case SNDRV_PCM_TRIGGER_SUSPEND:
132 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
133 priv->be_active = false;
134 break;
135 }
136
137 spin_unlock_irqrestore(&priv->lock, flags);
138
139 return 0;
140 }
141
142 static const struct snd_soc_ops odroid_card_be_ops = {
143 .hw_params = odroid_card_be_hw_params,
144 .trigger = odroid_card_be_trigger,
145 };
146
147 /* DAPM routes for backward compatibility with old DTS */
148 static const struct snd_soc_dapm_route odroid_dapm_routes[] = {
149 { "I2S Playback", NULL, "Mixer DAI TX" },
150 { "HiFi Playback", NULL, "Mixer DAI TX" },
151 };
152
153 SND_SOC_DAILINK_DEFS(primary,
154 DAILINK_COMP_ARRAY(COMP_EMPTY()),
155 DAILINK_COMP_ARRAY(COMP_DUMMY()),
156 DAILINK_COMP_ARRAY(COMP_PLATFORM("3830000.i2s")));
157
158 SND_SOC_DAILINK_DEFS(mixer,
159 DAILINK_COMP_ARRAY(COMP_DUMMY()),
160 DAILINK_COMP_ARRAY(COMP_EMPTY()));
161
162 SND_SOC_DAILINK_DEFS(secondary,
163 DAILINK_COMP_ARRAY(COMP_EMPTY()),
164 DAILINK_COMP_ARRAY(COMP_DUMMY()),
165 DAILINK_COMP_ARRAY(COMP_PLATFORM("3830000.i2s-sec")));
166
167 static struct snd_soc_dai_link odroid_card_dais[] = {
168 {
169 /* Primary FE <-> BE link */
170 .ops = &odroid_card_fe_ops,
171 .name = "Primary",
172 .stream_name = "Primary",
173 .dynamic = 1,
174 .dpcm_playback = 1,
175 SND_SOC_DAILINK_REG(primary),
176 }, {
177 /* BE <-> CODECs link */
178 .name = "I2S Mixer",
179 .ops = &odroid_card_be_ops,
180 .no_pcm = 1,
181 .dpcm_playback = 1,
182 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
183 SND_SOC_DAIFMT_CBS_CFS,
184 SND_SOC_DAILINK_REG(mixer),
185 }, {
186 /* Secondary FE <-> BE link */
187 .playback_only = 1,
188 .ops = &odroid_card_fe_ops,
189 .name = "Secondary",
190 .stream_name = "Secondary",
191 .dynamic = 1,
192 .dpcm_playback = 1,
193 SND_SOC_DAILINK_REG(secondary),
194 }
195 };
196
197 static int odroid_audio_probe(struct platform_device *pdev)
198 {
199 struct device *dev = &pdev->dev;
200 struct device_node *cpu_dai = NULL;
201 struct device_node *cpu, *codec;
202 struct odroid_priv *priv;
203 struct snd_soc_card *card;
204 struct snd_soc_dai_link *link, *codec_link;
205 int num_pcms, ret, i;
206
207 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
208 if (!priv)
209 return -ENOMEM;
210
211 card = &priv->card;
212 card->dev = dev;
213
214 card->owner = THIS_MODULE;
215 card->fully_routed = true;
216
217 spin_lock_init(&priv->lock);
218 snd_soc_card_set_drvdata(card, priv);
219
220 ret = snd_soc_of_parse_card_name(card, "model");
221 if (ret < 0)
222 return ret;
223
224 if (of_property_present(dev->of_node, "samsung,audio-widgets")) {
225 ret = snd_soc_of_parse_audio_simple_widgets(card,
226 "samsung,audio-widgets");
227 if (ret < 0)
228 return ret;
229 }
230
231 ret = 0;
232 if (of_property_present(dev->of_node, "audio-routing"))
233 ret = snd_soc_of_parse_audio_routing(card, "audio-routing");
234 else if (of_property_present(dev->of_node, "samsung,audio-routing"))
235 ret = snd_soc_of_parse_audio_routing(card, "samsung,audio-routing");
236 if (ret < 0)
237 return ret;
238
239 card->dai_link = odroid_card_dais;
240 card->num_links = ARRAY_SIZE(odroid_card_dais);
241
242 cpu = of_get_child_by_name(dev->of_node, "cpu");
243 codec = of_get_child_by_name(dev->of_node, "codec");
244 link = card->dai_link;
245 codec_link = &card->dai_link[1];
246
247 /*
248 * For backwards compatibility create the secondary CPU DAI link only
249 * if there are 2 CPU DAI entries in the cpu sound-dai property in DT.
250 * Also add required DAPM routes not available in old DTS.
251 */
252 num_pcms = of_count_phandle_with_args(cpu, "sound-dai",
253 "#sound-dai-cells");
254 if (num_pcms == 1) {
255 card->dapm_routes = odroid_dapm_routes;
256 card->num_dapm_routes = ARRAY_SIZE(odroid_dapm_routes);
257 card->num_links--;
258 }
259
260 for (i = 0; i < num_pcms; i++, link += 2) {
261 ret = snd_soc_of_get_dai_name(cpu, &link->cpus->dai_name, i);
262 if (ret < 0)
263 break;
264 }
265 if (ret == 0) {
266 cpu_dai = of_parse_phandle(cpu, "sound-dai", 0);
267 if (!cpu_dai)
268 ret = -EINVAL;
269 }
270
271 of_node_put(cpu);
272 if (ret < 0)
273 goto err_put_node;
274
275 ret = snd_soc_of_get_dai_link_codecs(dev, codec, codec_link);
276 if (ret < 0)
277 goto err_put_cpu_dai;
278
279 /* Set capture capability only for boards with the MAX98090 CODEC */
280 if (codec_link->num_codecs > 1) {
281 card->dai_link[0].dpcm_capture = 1;
282 card->dai_link[1].dpcm_capture = 1;
283 }
284
285 priv->sclk_i2s = of_clk_get_by_name(cpu_dai, "i2s_opclk1");
286 if (IS_ERR(priv->sclk_i2s)) {
287 ret = PTR_ERR(priv->sclk_i2s);
288 goto err_put_cpu_dai;
289 }
290
291 priv->clk_i2s_bus = of_clk_get_by_name(cpu_dai, "iis");
292 if (IS_ERR(priv->clk_i2s_bus)) {
293 ret = PTR_ERR(priv->clk_i2s_bus);
294 goto err_put_sclk;
295 }
296
297 ret = devm_snd_soc_register_card(dev, card);
298 if (ret < 0) {
299 dev_err_probe(dev, ret, "snd_soc_register_card() failed\n");
300 goto err_put_clk_i2s;
301 }
302
303 of_node_put(cpu_dai);
304 of_node_put(codec);
305 return 0;
306
307 err_put_clk_i2s:
308 clk_put(priv->clk_i2s_bus);
309 err_put_sclk:
310 clk_put(priv->sclk_i2s);
311 err_put_cpu_dai:
312 of_node_put(cpu_dai);
313 snd_soc_of_put_dai_link_codecs(codec_link);
314 err_put_node:
315 of_node_put(codec);
316 return ret;
317 }
318
319 static void odroid_audio_remove(struct platform_device *pdev)
320 {
321 struct odroid_priv *priv = platform_get_drvdata(pdev);
322
323 snd_soc_of_put_dai_link_codecs(&priv->card.dai_link[1]);
324 clk_put(priv->sclk_i2s);
325 clk_put(priv->clk_i2s_bus);
326 }
327
328 static const struct of_device_id odroid_audio_of_match[] = {
329 { .compatible = "hardkernel,odroid-xu3-audio" },
330 { .compatible = "hardkernel,odroid-xu4-audio" },
331 { .compatible = "samsung,odroid-xu3-audio" },
332 { .compatible = "samsung,odroid-xu4-audio" },
333 { },
334 };
335 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
336
337 static struct platform_driver odroid_audio_driver = {
338 .driver = {
339 .name = "odroid-audio",
340 .of_match_table = odroid_audio_of_match,
341 .pm = &snd_soc_pm_ops,
342 },
343 .probe = odroid_audio_probe,
344 .remove_new = odroid_audio_remove,
345 };
346 module_platform_driver(odroid_audio_driver);
347
348 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
349 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
350 MODULE_LICENSE("GPL v2");
351
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