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
13struct 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 */
21static 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
29static 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
40static const struct snd_soc_ops gx_card_i2s_be_ops = {
41	.hw_params = gx_card_i2s_be_hw_params,
42};
43
44static 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
67static 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
79static 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
119static const struct meson_card_match_data gx_card_match_data = {
120	.add_link = gx_card_add_link,
121};
122
123static const struct of_device_id gx_card_of_match[] = {
124	{
125		.compatible = "amlogic,gx-sound-card",
126		.data = &gx_card_match_data,
127	}, {}
128};
129MODULE_DEVICE_TABLE(of, gx_card_of_match);
130
131static 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};
139module_platform_driver(gx_card_pdrv);
140
141MODULE_DESCRIPTION("Amlogic GX ALSA machine driver");
142MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
143MODULE_LICENSE("GPL v2");
144