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/of_device.h>
9 #include <linux/module.h>
10 #include <sound/soc.h>
11 #include <sound/pcm_params.h>
12 #include "i2s.h"
13 #include "i2s-regs.h"
14
15 struct odroid_priv {
16 struct snd_soc_card card;
17 struct clk *clk_i2s_bus;
18 struct clk *sclk_i2s;
19
20 /* Spinlock protecting fields below */
21 spinlock_t lock;
22 unsigned int be_sample_rate;
23 bool be_active;
24 };
25
odroid_card_fe_startup(struct snd_pcm_substream * substream)26 static int odroid_card_fe_startup(struct snd_pcm_substream *substream)
27 {
28 struct snd_pcm_runtime *runtime = substream->runtime;
29
30 snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
31
32 return 0;
33 }
34
odroid_card_fe_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)35 static int odroid_card_fe_hw_params(struct snd_pcm_substream *substream,
36 struct snd_pcm_hw_params *params)
37 {
38 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
39 struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
40 unsigned long flags;
41 int ret = 0;
42
43 spin_lock_irqsave(&priv->lock, flags);
44 if (priv->be_active && priv->be_sample_rate != params_rate(params))
45 ret = -EINVAL;
46 spin_unlock_irqrestore(&priv->lock, flags);
47
48 return ret;
49 }
50
51 static const struct snd_soc_ops odroid_card_fe_ops = {
52 .startup = odroid_card_fe_startup,
53 .hw_params = odroid_card_fe_hw_params,
54 };
55
odroid_card_be_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)56 static int odroid_card_be_hw_params(struct snd_pcm_substream *substream,
57 struct snd_pcm_hw_params *params)
58 {
59 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
60 struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
61 unsigned int pll_freq, rclk_freq, rfs;
62 unsigned long flags;
63 int ret;
64
65 switch (params_rate(params)) {
66 case 64000:
67 pll_freq = 196608001U;
68 rfs = 384;
69 break;
70 case 44100:
71 case 88200:
72 pll_freq = 180633609U;
73 rfs = 512;
74 break;
75 case 32000:
76 case 48000:
77 case 96000:
78 pll_freq = 196608001U;
79 rfs = 512;
80 break;
81 default:
82 return -EINVAL;
83 }
84
85 ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
86 if (ret < 0)
87 return ret;
88
89 /*
90 * We add 2 to the rclk_freq value in order to avoid too low clock
91 * frequency values due to the EPLL output frequency not being exact
92 * multiple of the audio sampling rate.
93 */
94 rclk_freq = params_rate(params) * rfs + 2;
95
96 ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
97 if (ret < 0)
98 return ret;
99
100 if (rtd->dai_link->num_codecs > 1) {
101 struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 1);
102
103 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
104 SND_SOC_CLOCK_IN);
105 if (ret < 0)
106 return ret;
107 }
108
109 spin_lock_irqsave(&priv->lock, flags);
110 priv->be_sample_rate = params_rate(params);
111 spin_unlock_irqrestore(&priv->lock, flags);
112
113 return 0;
114 }
115
odroid_card_be_trigger(struct snd_pcm_substream * substream,int cmd)116 static int odroid_card_be_trigger(struct snd_pcm_substream *substream, int cmd)
117 {
118 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
119 struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
120 unsigned long flags;
121
122 spin_lock_irqsave(&priv->lock, flags);
123
124 switch (cmd) {
125 case SNDRV_PCM_TRIGGER_START:
126 case SNDRV_PCM_TRIGGER_RESUME:
127 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
128 priv->be_active = true;
129 break;
130
131 case SNDRV_PCM_TRIGGER_STOP:
132 case SNDRV_PCM_TRIGGER_SUSPEND:
133 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
134 priv->be_active = false;
135 break;
136 }
137
138 spin_unlock_irqrestore(&priv->lock, flags);
139
140 return 0;
141 }
142
143 static const struct snd_soc_ops odroid_card_be_ops = {
144 .hw_params = odroid_card_be_hw_params,
145 .trigger = odroid_card_be_trigger,
146 };
147
148 /* DAPM routes for backward compatibility with old DTS */
149 static const struct snd_soc_dapm_route odroid_dapm_routes[] = {
150 { "I2S Playback", NULL, "Mixer DAI TX" },
151 { "HiFi Playback", NULL, "Mixer DAI TX" },
152 };
153
154 SND_SOC_DAILINK_DEFS(primary,
155 DAILINK_COMP_ARRAY(COMP_EMPTY()),
156 DAILINK_COMP_ARRAY(COMP_DUMMY()),
157 DAILINK_COMP_ARRAY(COMP_PLATFORM("3830000.i2s")));
158
159 SND_SOC_DAILINK_DEFS(mixer,
160 DAILINK_COMP_ARRAY(COMP_DUMMY()),
161 DAILINK_COMP_ARRAY(COMP_EMPTY()),
162 DAILINK_COMP_ARRAY(COMP_DUMMY()));
163
164 SND_SOC_DAILINK_DEFS(secondary,
165 DAILINK_COMP_ARRAY(COMP_EMPTY()),
166 DAILINK_COMP_ARRAY(COMP_DUMMY()),
167 DAILINK_COMP_ARRAY(COMP_PLATFORM("3830000.i2s-sec")));
168
169 static struct snd_soc_dai_link odroid_card_dais[] = {
170 {
171 /* Primary FE <-> BE link */
172 .ops = &odroid_card_fe_ops,
173 .name = "Primary",
174 .stream_name = "Primary",
175 .dynamic = 1,
176 .dpcm_playback = 1,
177 SND_SOC_DAILINK_REG(primary),
178 }, {
179 /* BE <-> CODECs link */
180 .name = "I2S Mixer",
181 .ops = &odroid_card_be_ops,
182 .no_pcm = 1,
183 .dpcm_playback = 1,
184 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
185 SND_SOC_DAIFMT_CBS_CFS,
186 SND_SOC_DAILINK_REG(mixer),
187 }, {
188 /* Secondary FE <-> BE link */
189 .playback_only = 1,
190 .ops = &odroid_card_fe_ops,
191 .name = "Secondary",
192 .stream_name = "Secondary",
193 .dynamic = 1,
194 .dpcm_playback = 1,
195 SND_SOC_DAILINK_REG(secondary),
196 }
197 };
198
odroid_audio_probe(struct platform_device * pdev)199 static int odroid_audio_probe(struct platform_device *pdev)
200 {
201 struct device *dev = &pdev->dev;
202 struct device_node *cpu_dai = NULL;
203 struct device_node *cpu, *codec;
204 struct odroid_priv *priv;
205 struct snd_soc_card *card;
206 struct snd_soc_dai_link *link, *codec_link;
207 int num_pcms, ret, i;
208
209 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
210 if (!priv)
211 return -ENOMEM;
212
213 card = &priv->card;
214 card->dev = dev;
215
216 card->owner = THIS_MODULE;
217 card->fully_routed = true;
218
219 spin_lock_init(&priv->lock);
220 snd_soc_card_set_drvdata(card, priv);
221
222 ret = snd_soc_of_parse_card_name(card, "model");
223 if (ret < 0)
224 return ret;
225
226 if (of_property_present(dev->of_node, "samsung,audio-widgets")) {
227 ret = snd_soc_of_parse_audio_simple_widgets(card,
228 "samsung,audio-widgets");
229 if (ret < 0)
230 return ret;
231 }
232
233 ret = 0;
234 if (of_property_present(dev->of_node, "audio-routing"))
235 ret = snd_soc_of_parse_audio_routing(card, "audio-routing");
236 else if (of_property_present(dev->of_node, "samsung,audio-routing"))
237 ret = snd_soc_of_parse_audio_routing(card, "samsung,audio-routing");
238 if (ret < 0)
239 return ret;
240
241 card->dai_link = odroid_card_dais;
242 card->num_links = ARRAY_SIZE(odroid_card_dais);
243
244 cpu = of_get_child_by_name(dev->of_node, "cpu");
245 codec = of_get_child_by_name(dev->of_node, "codec");
246 link = card->dai_link;
247 codec_link = &card->dai_link[1];
248
249 /*
250 * For backwards compatibility create the secondary CPU DAI link only
251 * if there are 2 CPU DAI entries in the cpu sound-dai property in DT.
252 * Also add required DAPM routes not available in old DTS.
253 */
254 num_pcms = of_count_phandle_with_args(cpu, "sound-dai",
255 "#sound-dai-cells");
256 if (num_pcms == 1) {
257 card->dapm_routes = odroid_dapm_routes;
258 card->num_dapm_routes = ARRAY_SIZE(odroid_dapm_routes);
259 card->num_links--;
260 }
261
262 for (i = 0; i < num_pcms; i++, link += 2) {
263 ret = snd_soc_of_get_dai_name(cpu, &link->cpus->dai_name, i);
264 if (ret < 0)
265 break;
266 }
267 if (ret == 0) {
268 cpu_dai = of_parse_phandle(cpu, "sound-dai", 0);
269 if (!cpu_dai)
270 ret = -EINVAL;
271 }
272
273 of_node_put(cpu);
274 if (ret < 0)
275 goto err_put_node;
276
277 ret = snd_soc_of_get_dai_link_codecs(dev, codec, codec_link);
278 if (ret < 0)
279 goto err_put_cpu_dai;
280
281 /* Set capture capability only for boards with the MAX98090 CODEC */
282 if (codec_link->num_codecs > 1) {
283 card->dai_link[0].dpcm_capture = 1;
284 card->dai_link[1].dpcm_capture = 1;
285 }
286
287 priv->sclk_i2s = of_clk_get_by_name(cpu_dai, "i2s_opclk1");
288 if (IS_ERR(priv->sclk_i2s)) {
289 ret = PTR_ERR(priv->sclk_i2s);
290 goto err_put_cpu_dai;
291 }
292
293 priv->clk_i2s_bus = of_clk_get_by_name(cpu_dai, "iis");
294 if (IS_ERR(priv->clk_i2s_bus)) {
295 ret = PTR_ERR(priv->clk_i2s_bus);
296 goto err_put_sclk;
297 }
298
299 ret = devm_snd_soc_register_card(dev, card);
300 if (ret < 0) {
301 dev_err_probe(dev, ret, "snd_soc_register_card() failed\n");
302 goto err_put_clk_i2s;
303 }
304
305 of_node_put(cpu_dai);
306 of_node_put(codec);
307 return 0;
308
309 err_put_clk_i2s:
310 clk_put(priv->clk_i2s_bus);
311 err_put_sclk:
312 clk_put(priv->sclk_i2s);
313 err_put_cpu_dai:
314 of_node_put(cpu_dai);
315 snd_soc_of_put_dai_link_codecs(codec_link);
316 err_put_node:
317 of_node_put(codec);
318 return ret;
319 }
320
odroid_audio_remove(struct platform_device * pdev)321 static void odroid_audio_remove(struct platform_device *pdev)
322 {
323 struct odroid_priv *priv = platform_get_drvdata(pdev);
324
325 snd_soc_of_put_dai_link_codecs(&priv->card.dai_link[1]);
326 clk_put(priv->sclk_i2s);
327 clk_put(priv->clk_i2s_bus);
328 }
329
330 static const struct of_device_id odroid_audio_of_match[] = {
331 { .compatible = "hardkernel,odroid-xu3-audio" },
332 { .compatible = "hardkernel,odroid-xu4-audio" },
333 { .compatible = "samsung,odroid-xu3-audio" },
334 { .compatible = "samsung,odroid-xu4-audio" },
335 { },
336 };
337 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
338
339 static struct platform_driver odroid_audio_driver = {
340 .driver = {
341 .name = "odroid-audio",
342 .of_match_table = odroid_audio_of_match,
343 .pm = &snd_soc_pm_ops,
344 },
345 .probe = odroid_audio_probe,
346 .remove_new = odroid_audio_remove,
347 };
348 module_platform_driver(odroid_audio_driver);
349
350 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
351 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
352 MODULE_LICENSE("GPL v2");
353