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->id];
 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		/* Check if the cpu is the i2s encoder and parse i2s data */
111		if (gx_card_cpu_identify(dai_link->cpus, "I2S Encoder"))
112			ret = gx_card_parse_i2s(card, np, index);
113	}
114
115	return ret;
116}
117
118static const struct meson_card_match_data gx_card_match_data = {
119	.add_link = gx_card_add_link,
120};
121
122static const struct of_device_id gx_card_of_match[] = {
123	{
124		.compatible = "amlogic,gx-sound-card",
125		.data = &gx_card_match_data,
126	}, {}
127};
128MODULE_DEVICE_TABLE(of, gx_card_of_match);
129
130static struct platform_driver gx_card_pdrv = {
131	.probe = meson_card_probe,
132	.remove = meson_card_remove,
133	.driver = {
134		.name = "gx-sound-card",
135		.of_match_table = gx_card_of_match,
136	},
137};
138module_platform_driver(gx_card_pdrv);
139
140MODULE_DESCRIPTION("Amlogic GX ALSA machine driver");
141MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
142MODULE_LICENSE("GPL v2");