snow.c

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