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 = 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 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 = 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