1 // SPDX-License-Identifier: GPL-2.0
3 // ASoC machine driver for Snow boards
6 #include <linux/module.h>
7 #include <linux/platform_device.h>
9 #include <linux/of_device.h>
10 #include <sound/pcm_params.h>
11 #include <sound/soc.h>
15 #define FIN_PLL_RATE 24000000
17 SND_SOC_DAILINK_DEFS(links,
18 DAILINK_COMP_ARRAY(COMP_EMPTY()),
19 DAILINK_COMP_ARRAY(COMP_EMPTY()),
20 DAILINK_COMP_ARRAY(COMP_EMPTY()));
23 struct snd_soc_dai_link dai_link;
24 struct clk *clk_i2s_bus;
27 static int snow_card_hw_params(struct snd_pcm_substream *substream,
28 struct snd_pcm_hw_params *params)
30 static const unsigned int pll_rate[] = {
31 73728000U, 67737602U, 49152000U, 45158401U, 32768001U
33 struct snd_soc_pcm_runtime *rtd = substream->private_data;
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;
40 bitwidth = snd_pcm_format_width(params_format(params));
42 dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth);
46 if (bitwidth != 16 && bitwidth != 24) {
47 dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth);
53 switch (params_rate(params)) {
76 rclk = params_rate(params) * rfs;
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) {
87 dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk);
91 ret = clk_set_rate(priv->clk_i2s_bus, freq);
93 dev_err(rtd->card->dev, "I2S bus clock rate set failed\n");
100 static const struct snd_soc_ops snow_card_ops = {
101 .hw_params = snow_card_hw_params,
104 static int snow_late_probe(struct snd_soc_card *card)
106 struct snd_soc_pcm_runtime *rtd;
107 struct snd_soc_dai *codec_dai;
109 rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
111 /* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */
112 if (rtd->num_codecs > 1)
113 codec_dai = rtd->codec_dais[0];
115 codec_dai = rtd->codec_dai;
117 /* Set the MCLK rate for the codec */
118 return snd_soc_dai_set_sysclk(codec_dai, 0,
119 FIN_PLL_RATE, SND_SOC_CLOCK_IN);
122 static struct snd_soc_card snow_snd = {
124 .owner = THIS_MODULE,
125 .late_probe = snow_late_probe,
128 static int snow_probe(struct platform_device *pdev)
130 struct device *dev = &pdev->dev;
131 struct snd_soc_card *card = &snow_snd;
132 struct device_node *cpu, *codec;
133 struct snd_soc_dai_link *link;
134 struct snow_priv *priv;
137 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
141 link = &priv->dai_link;
143 link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
144 SND_SOC_DAIFMT_CBS_CFS;
146 link->name = "Primary";
147 link->stream_name = link->name;
149 link->cpus = links_cpus;
150 link->num_cpus = ARRAY_SIZE(links_cpus);
151 link->codecs = links_codecs;
152 link->num_codecs = ARRAY_SIZE(links_codecs);
153 link->platforms = links_platforms;
154 link->num_platforms = ARRAY_SIZE(links_platforms);
156 card->dai_link = link;
160 /* Try new DT bindings with HDMI support first. */
161 cpu = of_get_child_by_name(dev->of_node, "cpu");
164 link->ops = &snow_card_ops;
166 link->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0);
169 if (!link->cpus->of_node) {
170 dev_err(dev, "Failed parsing cpu/sound-dai property\n");
174 codec = of_get_child_by_name(dev->of_node, "codec");
175 ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
179 of_node_put(link->cpus->of_node);
180 dev_err(dev, "Failed parsing codec node\n");
184 priv->clk_i2s_bus = of_clk_get_by_name(link->cpus->of_node,
186 if (IS_ERR(priv->clk_i2s_bus)) {
187 snd_soc_of_put_dai_link_codecs(link);
188 of_node_put(link->cpus->of_node);
189 return PTR_ERR(priv->clk_i2s_bus);
192 link->codecs->dai_name = "HiFi",
194 link->cpus->of_node = of_parse_phandle(dev->of_node,
195 "samsung,i2s-controller", 0);
196 if (!link->cpus->of_node) {
197 dev_err(dev, "i2s-controller property parse error\n");
201 link->codecs->of_node = of_parse_phandle(dev->of_node,
202 "samsung,audio-codec", 0);
203 if (!link->codecs->of_node) {
204 of_node_put(link->cpus->of_node);
205 dev_err(dev, "audio-codec property parse error\n");
210 link->platforms->of_node = link->cpus->of_node;
212 /* Update card-name if provided through DT, else use default name */
213 snd_soc_of_parse_card_name(card, "samsung,model");
215 snd_soc_card_set_drvdata(card, priv);
217 ret = devm_snd_soc_register_card(dev, card);
219 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
226 static int snow_remove(struct platform_device *pdev)
228 struct snow_priv *priv = platform_get_drvdata(pdev);
229 struct snd_soc_dai_link *link = &priv->dai_link;
231 of_node_put(link->cpus->of_node);
232 of_node_put(link->codecs->of_node);
233 snd_soc_of_put_dai_link_codecs(link);
235 clk_put(priv->clk_i2s_bus);
240 static const struct of_device_id snow_of_match[] = {
241 { .compatible = "google,snow-audio-max98090", },
242 { .compatible = "google,snow-audio-max98091", },
243 { .compatible = "google,snow-audio-max98095", },
246 MODULE_DEVICE_TABLE(of, snow_of_match);
248 static struct platform_driver snow_driver = {
250 .name = "snow-audio",
251 .pm = &snd_soc_pm_ops,
252 .of_match_table = snow_of_match,
255 .remove = snow_remove,
258 module_platform_driver(snow_driver);
260 MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
261 MODULE_LICENSE("GPL");