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
16 SND_SOC_DAILINK_DEFS(links,
17 DAILINK_COMP_ARRAY(COMP_EMPTY()),
18 DAILINK_COMP_ARRAY(COMP_EMPTY()),
19 DAILINK_COMP_ARRAY(COMP_EMPTY()));
20
21 struct snow_priv {
22 struct snd_soc_dai_link dai_link;
23 struct clk *clk_i2s_bus;
24 };
25
snow_card_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)26 static 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
99 static const struct snd_soc_ops snow_card_ops = {
100 .hw_params = snow_card_hw_params,
101 };
102
snow_late_probe(struct snd_soc_card * card)103 static 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
118 static struct snd_soc_card snow_snd = {
119 .name = "Snow-I2S",
120 .owner = THIS_MODULE,
121 .late_probe = snow_late_probe,
122 };
123
snow_probe(struct platform_device * pdev)124 static 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_CBS_CFS;
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
snow_remove(struct platform_device * pdev)221 static 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
233 static 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 };
239 MODULE_DEVICE_TABLE(of, snow_of_match);
240
241 static 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
251 module_platform_driver(snow_driver);
252
253 MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
254 MODULE_LICENSE("GPL");
255