xref: /kernel/linux/linux-6.6/sound/soc/samsung/snow.c (revision 62306a36) 
1// SPDX-License-Identifier: GPL-2.0
2//
3// ASoC machine driver for Snow boards
4
5#include <linux/clk.h>
6#include <linux/module.h>
7#include <linux/platform_device.h>
8#include <linux/of.h>
9#include <linux/of_device.h>
10#include <sound/pcm_params.h>
11#include <sound/soc.h>
12
13#include "i2s.h"
14
15#define FIN_PLL_RATE		24000000
16
17SND_SOC_DAILINK_DEFS(links,
18	DAILINK_COMP_ARRAY(COMP_EMPTY()),
19	DAILINK_COMP_ARRAY(COMP_EMPTY()),
20	DAILINK_COMP_ARRAY(COMP_EMPTY()));
21
22struct snow_priv {
23	struct snd_soc_dai_link dai_link;
24	struct clk *clk_i2s_bus;
25};
26
27static int snow_card_hw_params(struct snd_pcm_substream *substream,
28				      struct snd_pcm_hw_params *params)
29{
30	static const unsigned int pll_rate[] = {
31		73728000U, 67737602U, 49152000U, 45158401U, 32768001U
32	};
33	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
34	struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card);
35	int bfs, psr, rfs, bitwidth;
36	unsigned long int rclk;
37	long int freq = -EINVAL;
38	int ret, i;
39
40	bitwidth = snd_pcm_format_width(params_format(params));
41	if (bitwidth < 0) {
42		dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth);
43		return bitwidth;
44	}
45
46	if (bitwidth != 16 && bitwidth != 24) {
47		dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth);
48		return -EINVAL;
49	}
50
51	bfs = 2 * bitwidth;
52
53	switch (params_rate(params)) {
54	case 16000:
55	case 22050:
56	case 24000:
57	case 32000:
58	case 44100:
59	case 48000:
60	case 88200:
61	case 96000:
62		rfs = 8 * bfs;
63		break;
64	case 64000:
65		rfs = 384;
66		break;
67	case 8000:
68	case 11025:
69	case 12000:
70		rfs = 16 * bfs;
71		break;
72	default:
73		return -EINVAL;
74	}
75
76	rclk = params_rate(params) * rfs;
77
78	for (psr = 8; psr > 0; psr /= 2) {
79		for (i = 0; i < ARRAY_SIZE(pll_rate); i++) {
80			if ((pll_rate[i] - rclk * psr) <= 2) {
81				freq = pll_rate[i];
82				break;
83			}
84		}
85	}
86	if (freq < 0) {
87		dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk);
88		return -EINVAL;
89	}
90
91	ret = clk_set_rate(priv->clk_i2s_bus, freq);
92	if (ret < 0) {
93		dev_err(rtd->card->dev, "I2S bus clock rate set failed\n");
94		return ret;
95	}
96
97	return 0;
98}
99
100static const struct snd_soc_ops snow_card_ops = {
101	.hw_params = snow_card_hw_params,
102};
103
104static int snow_late_probe(struct snd_soc_card *card)
105{
106	struct snd_soc_pcm_runtime *rtd;
107	struct snd_soc_dai *codec_dai;
108
109	rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]);
110
111	/* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */
112	codec_dai = asoc_rtd_to_codec(rtd, 0);
113
114	/* Set the MCLK rate for the codec */
115	return snd_soc_dai_set_sysclk(codec_dai, 0,
116				FIN_PLL_RATE, SND_SOC_CLOCK_IN);
117}
118
119static struct snd_soc_card snow_snd = {
120	.name = "Snow-I2S",
121	.owner = THIS_MODULE,
122	.late_probe = snow_late_probe,
123};
124
125static int snow_probe(struct platform_device *pdev)
126{
127	struct device *dev = &pdev->dev;
128	struct snd_soc_card *card = &snow_snd;
129	struct device_node *cpu, *codec;
130	struct snd_soc_dai_link *link;
131	struct snow_priv *priv;
132	int ret;
133
134	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
135	if (!priv)
136		return -ENOMEM;
137
138	link = &priv->dai_link;
139
140	link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
141			SND_SOC_DAIFMT_CBS_CFS;
142
143	link->name = "Primary";
144	link->stream_name = link->name;
145
146	link->cpus = links_cpus;
147	link->num_cpus = ARRAY_SIZE(links_cpus);
148	link->codecs = links_codecs;
149	link->num_codecs = ARRAY_SIZE(links_codecs);
150	link->platforms = links_platforms;
151	link->num_platforms = ARRAY_SIZE(links_platforms);
152
153	card->dai_link = link;
154	card->num_links = 1;
155	card->dev = dev;
156
157	/* Try new DT bindings with HDMI support first. */
158	cpu = of_get_child_by_name(dev->of_node, "cpu");
159
160	if (cpu) {
161		link->ops = &snow_card_ops;
162
163		link->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0);
164		of_node_put(cpu);
165
166		if (!link->cpus->of_node) {
167			dev_err(dev, "Failed parsing cpu/sound-dai property\n");
168			return -EINVAL;
169		}
170
171		codec = of_get_child_by_name(dev->of_node, "codec");
172		ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
173		of_node_put(codec);
174
175		if (ret < 0) {
176			of_node_put(link->cpus->of_node);
177			dev_err(dev, "Failed parsing codec node\n");
178			return ret;
179		}
180
181		priv->clk_i2s_bus = of_clk_get_by_name(link->cpus->of_node,
182						       "i2s_opclk0");
183		if (IS_ERR(priv->clk_i2s_bus)) {
184			snd_soc_of_put_dai_link_codecs(link);
185			of_node_put(link->cpus->of_node);
186			return PTR_ERR(priv->clk_i2s_bus);
187		}
188	} else {
189		link->codecs->dai_name = "HiFi";
190
191		link->cpus->of_node = of_parse_phandle(dev->of_node,
192						"samsung,i2s-controller", 0);
193		if (!link->cpus->of_node) {
194			dev_err(dev, "i2s-controller property parse error\n");
195			return -EINVAL;
196		}
197
198		link->codecs->of_node = of_parse_phandle(dev->of_node,
199						"samsung,audio-codec", 0);
200		if (!link->codecs->of_node) {
201			of_node_put(link->cpus->of_node);
202			dev_err(dev, "audio-codec property parse error\n");
203			return -EINVAL;
204		}
205	}
206
207	link->platforms->of_node = link->cpus->of_node;
208
209	/* Update card-name if provided through DT, else use default name */
210	snd_soc_of_parse_card_name(card, "samsung,model");
211
212	snd_soc_card_set_drvdata(card, priv);
213
214	ret = devm_snd_soc_register_card(dev, card);
215	if (ret)
216		return dev_err_probe(&pdev->dev, ret,
217				     "snd_soc_register_card failed\n");
218
219	return 0;
220}
221
222static void snow_remove(struct platform_device *pdev)
223{
224	struct snow_priv *priv = platform_get_drvdata(pdev);
225	struct snd_soc_dai_link *link = &priv->dai_link;
226
227	of_node_put(link->cpus->of_node);
228	of_node_put(link->codecs->of_node);
229	snd_soc_of_put_dai_link_codecs(link);
230
231	clk_put(priv->clk_i2s_bus);
232}
233
234static const struct of_device_id snow_of_match[] = {
235	{ .compatible = "google,snow-audio-max98090", },
236	{ .compatible = "google,snow-audio-max98091", },
237	{ .compatible = "google,snow-audio-max98095", },
238	{},
239};
240MODULE_DEVICE_TABLE(of, snow_of_match);
241
242static struct platform_driver snow_driver = {
243	.driver = {
244		.name = "snow-audio",
245		.pm = &snd_soc_pm_ops,
246		.of_match_table = snow_of_match,
247	},
248	.probe = snow_probe,
249	.remove_new = snow_remove,
250};
251
252module_platform_driver(snow_driver);
253
254MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
255MODULE_LICENSE("GPL");
256