1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
2 //
3 // Copyright (c) 2020 BayLibre, SAS.
4 // Author: Jerome Brunet <jbrunet@baylibre.com>
5
6 #include <linux/module.h>
7 #include <linux/of_platform.h>
8 #include <sound/soc.h>
9 #include <sound/soc-dai.h>
10
11 #include "meson-card.h"
12
13 struct gx_dai_link_i2s_data {
14 unsigned int mclk_fs;
15 };
16
17 /*
18 * Base params for the codec to codec links
19 * Those will be over-written by the CPU side of the link
20 */
21 static const struct snd_soc_pcm_stream codec_params = {
22 .formats = SNDRV_PCM_FMTBIT_S24_LE,
23 .rate_min = 5525,
24 .rate_max = 192000,
25 .channels_min = 1,
26 .channels_max = 8,
27 };
28
29 static int gx_card_i2s_be_hw_params(struct snd_pcm_substream *substream,
30 struct snd_pcm_hw_params *params)
31 {
32 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
33 struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);
34 struct gx_dai_link_i2s_data *be =
35 (struct gx_dai_link_i2s_data *)priv->link_data[rtd->num];
36
37 return meson_card_i2s_set_sysclk(substream, params, be->mclk_fs);
38 }
39
40 static const struct snd_soc_ops gx_card_i2s_be_ops = {
41 .hw_params = gx_card_i2s_be_hw_params,
42 };
43
44 static int gx_card_parse_i2s(struct snd_soc_card *card,
45 struct device_node *node,
46 int *index)
47 {
48 struct meson_card *priv = snd_soc_card_get_drvdata(card);
49 struct snd_soc_dai_link *link = &card->dai_link[*index];
50 struct gx_dai_link_i2s_data *be;
51
52 /* Allocate i2s link parameters */
53 be = devm_kzalloc(card->dev, sizeof(*be), GFP_KERNEL);
54 if (!be)
55 return -ENOMEM;
56 priv->link_data[*index] = be;
57
58 /* Setup i2s link */
59 link->ops = &gx_card_i2s_be_ops;
60 link->dai_fmt = meson_card_parse_daifmt(node, link->cpus->of_node);
61
62 of_property_read_u32(node, "mclk-fs", &be->mclk_fs);
63
64 return 0;
65 }
66
67 static int gx_card_cpu_identify(struct snd_soc_dai_link_component *c,
68 char *match)
69 {
70 if (of_device_is_compatible(c->of_node, DT_PREFIX "aiu")) {
71 if (strstr(c->dai_name, match))
72 return 1;
73 }
74
75 /* dai not matched */
76 return 0;
77 }
78
79 static int gx_card_add_link(struct snd_soc_card *card, struct device_node *np,
80 int *index)
81 {
82 struct snd_soc_dai_link *dai_link = &card->dai_link[*index];
83 struct snd_soc_dai_link_component *cpu;
84 int ret;
85
86 cpu = devm_kzalloc(card->dev, sizeof(*cpu), GFP_KERNEL);
87 if (!cpu)
88 return -ENOMEM;
89
90 dai_link->cpus = cpu;
91 dai_link->num_cpus = 1;
92
93 ret = meson_card_parse_dai(card, np, dai_link->cpus);
94 if (ret)
95 return ret;
96
97 if (gx_card_cpu_identify(dai_link->cpus, "FIFO"))
98 return meson_card_set_fe_link(card, dai_link, np, true);
99
100 ret = meson_card_set_be_link(card, dai_link, np);
101 if (ret)
102 return ret;
103
104 /* Or apply codec to codec params if necessary */
105 if (gx_card_cpu_identify(dai_link->cpus, "CODEC CTRL")) {
106 dai_link->c2c_params = &codec_params;
107 dai_link->num_c2c_params = 1;
108 } else {
109 dai_link->no_pcm = 1;
110 snd_soc_dai_link_set_capabilities(dai_link);
111 /* Check if the cpu is the i2s encoder and parse i2s data */
112 if (gx_card_cpu_identify(dai_link->cpus, "I2S Encoder"))
113 ret = gx_card_parse_i2s(card, np, index);
114 }
115
116 return ret;
117 }
118
119 static const struct meson_card_match_data gx_card_match_data = {
120 .add_link = gx_card_add_link,
121 };
122
123 static const struct of_device_id gx_card_of_match[] = {
124 {
125 .compatible = "amlogic,gx-sound-card",
126 .data = &gx_card_match_data,
127 }, {}
128 };
129 MODULE_DEVICE_TABLE(of, gx_card_of_match);
130
131 static struct platform_driver gx_card_pdrv = {
132 .probe = meson_card_probe,
133 .remove_new = meson_card_remove,
134 .driver = {
135 .name = "gx-sound-card",
136 .of_match_table = gx_card_of_match,
137 },
138 };
139 module_platform_driver(gx_card_pdrv);
140
141 MODULE_DESCRIPTION("Amlogic GX ALSA machine driver");
142 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
143 MODULE_LICENSE("GPL v2");
144
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