odroid.c

  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		.playback_only = 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		.playback_only = 1,
182		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
183				SND_SOC_DAIFMT_CBC_CFC,
184		SND_SOC_DAILINK_REG(mixer),
185	}, {
186		/* Secondary FE <-> BE link */
187		.ops = &odroid_card_fe_ops,
188		.name = "Secondary",
189		.stream_name = "Secondary",
190		.dynamic = 1,
191		.playback_only = 1,
192		SND_SOC_DAILINK_REG(secondary),
193	}
194};
195
196static int odroid_audio_probe(struct platform_device *pdev)
197{
198	struct device *dev = &pdev->dev;
199	struct device_node *cpu_dai = NULL;
200	struct device_node *cpu, *codec;
201	struct odroid_priv *priv;
202	struct snd_soc_card *card;
203	struct snd_soc_dai_link *link, *codec_link;
204	int num_pcms, ret, i;
205
206	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
207	if (!priv)
208		return -ENOMEM;
209
210	card = &priv->card;
211	card->dev = dev;
212
213	card->owner = THIS_MODULE;
214	card->fully_routed = true;
215
216	spin_lock_init(&priv->lock);
217	snd_soc_card_set_drvdata(card, priv);
218
219	ret = snd_soc_of_parse_card_name(card, "model");
220	if (ret < 0)
221		return ret;
222
223	if (of_property_present(dev->of_node, "samsung,audio-widgets")) {
224		ret = snd_soc_of_parse_audio_simple_widgets(card,
225						"samsung,audio-widgets");
226		if (ret < 0)
227			return ret;
228	}
229
230	ret = 0;
231	if (of_property_present(dev->of_node, "audio-routing"))
232		ret = snd_soc_of_parse_audio_routing(card, "audio-routing");
233	else if (of_property_present(dev->of_node, "samsung,audio-routing"))
234		ret = snd_soc_of_parse_audio_routing(card, "samsung,audio-routing");
235	if (ret < 0)
236		return ret;
237
238	card->dai_link = odroid_card_dais;
239	card->num_links = ARRAY_SIZE(odroid_card_dais);
240
241	cpu = of_get_child_by_name(dev->of_node, "cpu");
242	codec = of_get_child_by_name(dev->of_node, "codec");
243	link = card->dai_link;
244	codec_link = &card->dai_link[1];
245
246	/*
247	 * For backwards compatibility create the secondary CPU DAI link only
248	 * if there are 2 CPU DAI entries in the cpu sound-dai property in DT.
249	 * Also add required DAPM routes not available in old DTS.
250	 */
251	num_pcms = of_count_phandle_with_args(cpu, "sound-dai",
252					      "#sound-dai-cells");
253	if (num_pcms == 1) {
254		card->dapm_routes = odroid_dapm_routes;
255		card->num_dapm_routes = ARRAY_SIZE(odroid_dapm_routes);
256		card->num_links--;
257	}
258
259	for (i = 0; i < num_pcms; i++, link += 2) {
260		ret = snd_soc_of_get_dai_name(cpu, &link->cpus->dai_name, i);
261		if (ret < 0)
262			break;
263	}
264	if (ret == 0) {
265		cpu_dai = of_parse_phandle(cpu, "sound-dai", 0);
266		if (!cpu_dai)
267			ret = -EINVAL;
268	}
269
270	of_node_put(cpu);
271	if (ret < 0)
272		goto err_put_node;
273
274	ret = snd_soc_of_get_dai_link_codecs(dev, codec, codec_link);
275	if (ret < 0)
276		goto err_put_cpu_dai;
277
278	/* Set capture capability only for boards with the MAX98090 CODEC */
279	if (codec_link->num_codecs > 1) {
280		card->dai_link[0].playback_only = 0;
281		card->dai_link[1].playback_only = 0;
282	}
283
284	priv->sclk_i2s = of_clk_get_by_name(cpu_dai, "i2s_opclk1");
285	if (IS_ERR(priv->sclk_i2s)) {
286		ret = PTR_ERR(priv->sclk_i2s);
287		goto err_put_cpu_dai;
288	}
289
290	priv->clk_i2s_bus = of_clk_get_by_name(cpu_dai, "iis");
291	if (IS_ERR(priv->clk_i2s_bus)) {
292		ret = PTR_ERR(priv->clk_i2s_bus);
293		goto err_put_sclk;
294	}
295
296	ret = devm_snd_soc_register_card(dev, card);
297	if (ret < 0) {
298		dev_err_probe(dev, ret, "snd_soc_register_card() failed\n");
299		goto err_put_clk_i2s;
300	}
301
302	of_node_put(cpu_dai);
303	of_node_put(codec);
304	return 0;
305
306err_put_clk_i2s:
307	clk_put(priv->clk_i2s_bus);
308err_put_sclk:
309	clk_put(priv->sclk_i2s);
310err_put_cpu_dai:
311	of_node_put(cpu_dai);
312	snd_soc_of_put_dai_link_codecs(codec_link);
313err_put_node:
314	of_node_put(codec);
315	return ret;
316}
317
318static void odroid_audio_remove(struct platform_device *pdev)
319{
320	struct odroid_priv *priv = platform_get_drvdata(pdev);
321
322	snd_soc_of_put_dai_link_codecs(&priv->card.dai_link[1]);
323	clk_put(priv->sclk_i2s);
324	clk_put(priv->clk_i2s_bus);
325}
326
327static const struct of_device_id odroid_audio_of_match[] = {
328	{ .compatible	= "hardkernel,odroid-xu3-audio" },
329	{ .compatible	= "hardkernel,odroid-xu4-audio" },
330	{ .compatible	= "samsung,odroid-xu3-audio" },
331	{ .compatible	= "samsung,odroid-xu4-audio" },
332	{ },
333};
334MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
335
336static struct platform_driver odroid_audio_driver = {
337	.driver = {
338		.name		= "odroid-audio",
339		.of_match_table	= odroid_audio_of_match,
340		.pm		= &snd_soc_pm_ops,
341	},
342	.probe	= odroid_audio_probe,
343	.remove = odroid_audio_remove,
344};
345module_platform_driver(odroid_audio_driver);
346
347MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
348MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
349MODULE_LICENSE("GPL v2");