xref: /openbmc/linux/sound/soc/meson/gx-card.c (revision 2e1dbea1)
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 
gx_card_i2s_be_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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 = asoc_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 
gx_card_parse_i2s(struct snd_soc_card * card,struct device_node * node,int * index)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 
gx_card_cpu_identify(struct snd_soc_dai_link_component * c,char * match)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 
gx_card_add_link(struct snd_soc_card * card,struct device_node * np,int * index)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 = 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