1 /*
2 * ASoC machine driver for Snow boards
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/of.h>
18 #include <linux/of_device.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
21
22 #include "i2s.h"
23
24 #define FIN_PLL_RATE 24000000
25
26 struct snow_priv {
27 struct snd_soc_dai_link dai_link;
28 struct clk *clk_i2s_bus;
29 };
30
snow_card_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)31 static int snow_card_hw_params(struct snd_pcm_substream *substream,
32 struct snd_pcm_hw_params *params)
33 {
34 static const unsigned int pll_rate[] = {
35 73728000U, 67737602U, 49152000U, 45158401U, 32768001U
36 };
37 struct snd_soc_pcm_runtime *rtd = substream->private_data;
38 struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card);
39 int bfs, psr, rfs, bitwidth;
40 unsigned long int rclk;
41 long int freq = -EINVAL;
42 int ret, i;
43
44 bitwidth = snd_pcm_format_width(params_format(params));
45 if (bitwidth < 0) {
46 dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth);
47 return bitwidth;
48 }
49
50 if (bitwidth != 16 && bitwidth != 24) {
51 dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth);
52 return -EINVAL;
53 }
54
55 bfs = 2 * bitwidth;
56
57 switch (params_rate(params)) {
58 case 16000:
59 case 22050:
60 case 24000:
61 case 32000:
62 case 44100:
63 case 48000:
64 case 88200:
65 case 96000:
66 rfs = 8 * bfs;
67 break;
68 case 64000:
69 rfs = 384;
70 break;
71 case 8000:
72 case 11025:
73 case 12000:
74 rfs = 16 * bfs;
75 break;
76 default:
77 return -EINVAL;
78 }
79
80 rclk = params_rate(params) * rfs;
81
82 for (psr = 8; psr > 0; psr /= 2) {
83 for (i = 0; i < ARRAY_SIZE(pll_rate); i++) {
84 if ((pll_rate[i] - rclk * psr) <= 2) {
85 freq = pll_rate[i];
86 break;
87 }
88 }
89 }
90 if (freq < 0) {
91 dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk);
92 return -EINVAL;
93 }
94
95 ret = clk_set_rate(priv->clk_i2s_bus, freq);
96 if (ret < 0) {
97 dev_err(rtd->card->dev, "I2S bus clock rate set failed\n");
98 return ret;
99 }
100
101 return 0;
102 }
103
104 static const struct snd_soc_ops snow_card_ops = {
105 .hw_params = snow_card_hw_params,
106 };
107
snow_late_probe(struct snd_soc_card * card)108 static int snow_late_probe(struct snd_soc_card *card)
109 {
110 struct snd_soc_pcm_runtime *rtd;
111 struct snd_soc_dai *codec_dai;
112
113 rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
114
115 /* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */
116 if (rtd->num_codecs > 1)
117 codec_dai = rtd->codec_dais[0];
118 else
119 codec_dai = rtd->codec_dai;
120
121 /* Set the MCLK rate for the codec */
122 return snd_soc_dai_set_sysclk(codec_dai, 0,
123 FIN_PLL_RATE, SND_SOC_CLOCK_IN);
124 }
125
126 static struct snd_soc_card snow_snd = {
127 .name = "Snow-I2S",
128 .owner = THIS_MODULE,
129 .late_probe = snow_late_probe,
130 };
131
snow_probe(struct platform_device * pdev)132 static int snow_probe(struct platform_device *pdev)
133 {
134 struct device *dev = &pdev->dev;
135 struct snd_soc_card *card = &snow_snd;
136 struct device_node *cpu, *codec;
137 struct snd_soc_dai_link *link;
138 struct snow_priv *priv;
139 int ret;
140
141 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
142 if (!priv)
143 return -ENOMEM;
144
145 link = &priv->dai_link;
146
147 link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
148 SND_SOC_DAIFMT_CBS_CFS;
149
150 link->name = "Primary";
151 link->stream_name = link->name;
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->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0);
164 of_node_put(cpu);
165
166 if (!link->cpu_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->cpu_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->cpu_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->cpu_of_node);
186 return PTR_ERR(priv->clk_i2s_bus);
187 }
188 } else {
189 link->codec_dai_name = "HiFi",
190
191 link->cpu_of_node = of_parse_phandle(dev->of_node,
192 "samsung,i2s-controller", 0);
193 if (!link->cpu_of_node) {
194 dev_err(dev, "i2s-controller property parse error\n");
195 return -EINVAL;
196 }
197
198 link->codec_of_node = of_parse_phandle(dev->of_node,
199 "samsung,audio-codec", 0);
200 if (!link->codec_of_node) {
201 of_node_put(link->cpu_of_node);
202 dev_err(dev, "audio-codec property parse error\n");
203 return -EINVAL;
204 }
205 }
206
207 link->platform_of_node = link->cpu_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 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
217 return ret;
218 }
219
220 return ret;
221 }
222
snow_remove(struct platform_device * pdev)223 static int snow_remove(struct platform_device *pdev)
224 {
225 struct snow_priv *priv = platform_get_drvdata(pdev);
226 struct snd_soc_dai_link *link = &priv->dai_link;
227
228 of_node_put(link->cpu_of_node);
229 of_node_put(link->codec_of_node);
230 snd_soc_of_put_dai_link_codecs(link);
231
232 clk_put(priv->clk_i2s_bus);
233
234 return 0;
235 }
236
237 static const struct of_device_id snow_of_match[] = {
238 { .compatible = "google,snow-audio-max98090", },
239 { .compatible = "google,snow-audio-max98091", },
240 { .compatible = "google,snow-audio-max98095", },
241 {},
242 };
243 MODULE_DEVICE_TABLE(of, snow_of_match);
244
245 static struct platform_driver snow_driver = {
246 .driver = {
247 .name = "snow-audio",
248 .pm = &snd_soc_pm_ops,
249 .of_match_table = snow_of_match,
250 },
251 .probe = snow_probe,
252 .remove = snow_remove,
253 };
254
255 module_platform_driver(snow_driver);
256
257 MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
258 MODULE_LICENSE("GPL");
259