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
15struct 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
26static 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
35static 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
51static 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
56static 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
116static 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
143static 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 */
149static 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
154SND_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
159SND_SOC_DAILINK_DEFS(mixer,
160	DAILINK_COMP_ARRAY(COMP_DUMMY()),
161	DAILINK_COMP_ARRAY(COMP_EMPTY()),
162	DAILINK_COMP_ARRAY(COMP_DUMMY()));
163
164SND_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
169static 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
199static 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
309err_put_clk_i2s:
310	clk_put(priv->clk_i2s_bus);
311err_put_sclk:
312	clk_put(priv->sclk_i2s);
313err_put_cpu_dai:
314	of_node_put(cpu_dai);
315	snd_soc_of_put_dai_link_codecs(codec_link);
316err_put_node:
317	of_node_put(codec);
318	return ret;
319}
320
321static 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
330static 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};
337MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
338
339static 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};
348module_platform_driver(odroid_audio_driver);
349
350MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
351MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
352MODULE_LICENSE("GPL v2");
353