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
14struct 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
25static 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
34static 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
50static 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
55static 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
115static 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
142static 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 */
148static 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
153SND_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
158SND_SOC_DAILINK_DEFS(mixer,
159	DAILINK_COMP_ARRAY(COMP_DUMMY()),
160	DAILINK_COMP_ARRAY(COMP_EMPTY()));
161
162SND_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
167static 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
197static 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
307err_put_clk_i2s:
308	clk_put(priv->clk_i2s_bus);
309err_put_sclk:
310	clk_put(priv->sclk_i2s);
311err_put_cpu_dai:
312	of_node_put(cpu_dai);
313	snd_soc_of_put_dai_link_codecs(codec_link);
314err_put_node:
315	of_node_put(codec);
316	return ret;
317}
318
319static 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
328static 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};
335MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
336
337static 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};
346module_platform_driver(odroid_audio_driver);
347
348MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
349MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
350MODULE_LICENSE("GPL v2");
351