1 /* 2 * Copyright (C) 2017 Samsung Electronics Co., Ltd. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #include <linux/clk.h> 10 #include <linux/of.h> 11 #include <linux/of_device.h> 12 #include <linux/module.h> 13 #include <sound/soc.h> 14 #include <sound/pcm_params.h> 15 #include "i2s.h" 16 #include "i2s-regs.h" 17 18 struct odroid_priv { 19 struct snd_soc_card card; 20 struct snd_soc_dai_link dai_link; 21 22 struct clk *clk_i2s_bus; 23 struct clk *sclk_i2s; 24 }; 25 26 static int odroid_card_startup(struct snd_pcm_substream *substream) 27 { 28 struct snd_pcm_runtime *runtime = substream->runtime; 29 30 snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2); 31 return 0; 32 } 33 34 static int odroid_card_hw_params(struct snd_pcm_substream *substream, 35 struct snd_pcm_hw_params *params) 36 { 37 struct snd_soc_pcm_runtime *rtd = substream->private_data; 38 struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card); 39 unsigned int pll_freq, rclk_freq, rfs; 40 int ret; 41 42 switch (params_rate(params)) { 43 case 64000: 44 pll_freq = 196608001U; 45 rfs = 384; 46 break; 47 case 44100: 48 case 88200: 49 pll_freq = 180633609U; 50 rfs = 512; 51 break; 52 case 32000: 53 case 48000: 54 case 96000: 55 pll_freq = 196608001U; 56 rfs = 512; 57 break; 58 default: 59 return -EINVAL; 60 } 61 62 ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1); 63 if (ret < 0) 64 return ret; 65 66 /* 67 * We add 1 to the rclk_freq value in order to avoid too low clock 68 * frequency values due to the EPLL output frequency not being exact 69 * multiple of the audio sampling rate. 70 */ 71 rclk_freq = params_rate(params) * rfs + 1; 72 73 ret = clk_set_rate(priv->sclk_i2s, rclk_freq); 74 if (ret < 0) 75 return ret; 76 77 if (rtd->num_codecs > 1) { 78 struct snd_soc_dai *codec_dai = rtd->codec_dais[1]; 79 80 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq, 81 SND_SOC_CLOCK_IN); 82 if (ret < 0) 83 return ret; 84 } 85 86 return 0; 87 } 88 89 static const struct snd_soc_ops odroid_card_ops = { 90 .startup = odroid_card_startup, 91 .hw_params = odroid_card_hw_params, 92 }; 93 94 static int odroid_audio_probe(struct platform_device *pdev) 95 { 96 struct device *dev = &pdev->dev; 97 struct device_node *cpu, *codec; 98 struct odroid_priv *priv; 99 struct snd_soc_dai_link *link; 100 struct snd_soc_card *card; 101 int ret; 102 103 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 104 if (!priv) 105 return -ENOMEM; 106 107 card = &priv->card; 108 card->dev = dev; 109 110 card->owner = THIS_MODULE; 111 card->fully_routed = true; 112 113 snd_soc_card_set_drvdata(card, priv); 114 115 ret = snd_soc_of_parse_card_name(card, "model"); 116 if (ret < 0) 117 return ret; 118 119 if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) { 120 ret = snd_soc_of_parse_audio_simple_widgets(card, 121 "samsung,audio-widgets"); 122 if (ret < 0) 123 return ret; 124 } 125 126 if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) { 127 ret = snd_soc_of_parse_audio_routing(card, 128 "samsung,audio-routing"); 129 if (ret < 0) 130 return ret; 131 } 132 133 link = &priv->dai_link; 134 135 link->ops = &odroid_card_ops; 136 link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 137 SND_SOC_DAIFMT_CBS_CFS; 138 139 card->dai_link = &priv->dai_link; 140 card->num_links = 1; 141 142 cpu = of_get_child_by_name(dev->of_node, "cpu"); 143 codec = of_get_child_by_name(dev->of_node, "codec"); 144 145 link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0); 146 if (!link->cpu_of_node) { 147 dev_err(dev, "Failed parsing cpu/sound-dai property\n"); 148 return -EINVAL; 149 } 150 151 ret = snd_soc_of_get_dai_link_codecs(dev, codec, link); 152 if (ret < 0) 153 goto err_put_codec_n; 154 155 link->platform_of_node = link->cpu_of_node; 156 157 link->name = "Primary"; 158 link->stream_name = link->name; 159 160 161 priv->sclk_i2s = of_clk_get_by_name(link->cpu_of_node, "i2s_opclk1"); 162 if (IS_ERR(priv->sclk_i2s)) { 163 ret = PTR_ERR(priv->sclk_i2s); 164 goto err_put_i2s_n; 165 } 166 167 priv->clk_i2s_bus = of_clk_get_by_name(link->cpu_of_node, "iis"); 168 if (IS_ERR(priv->clk_i2s_bus)) { 169 ret = PTR_ERR(priv->clk_i2s_bus); 170 goto err_put_sclk; 171 } 172 173 ret = devm_snd_soc_register_card(dev, card); 174 if (ret < 0) { 175 dev_err(dev, "snd_soc_register_card() failed: %d\n", ret); 176 goto err_put_clk_i2s; 177 } 178 179 return 0; 180 181 err_put_clk_i2s: 182 clk_put(priv->clk_i2s_bus); 183 err_put_sclk: 184 clk_put(priv->sclk_i2s); 185 err_put_i2s_n: 186 of_node_put(link->cpu_of_node); 187 err_put_codec_n: 188 snd_soc_of_put_dai_link_codecs(link); 189 return ret; 190 } 191 192 static int odroid_audio_remove(struct platform_device *pdev) 193 { 194 struct odroid_priv *priv = platform_get_drvdata(pdev); 195 196 of_node_put(priv->dai_link.cpu_of_node); 197 snd_soc_of_put_dai_link_codecs(&priv->dai_link); 198 clk_put(priv->sclk_i2s); 199 clk_put(priv->clk_i2s_bus); 200 201 return 0; 202 } 203 204 static const struct of_device_id odroid_audio_of_match[] = { 205 { .compatible = "hardkernel,odroid-xu3-audio" }, 206 { .compatible = "hardkernel,odroid-xu4-audio" }, 207 { .compatible = "samsung,odroid-xu3-audio" }, 208 { .compatible = "samsung,odroid-xu4-audio" }, 209 { }, 210 }; 211 MODULE_DEVICE_TABLE(of, odroid_audio_of_match); 212 213 static struct platform_driver odroid_audio_driver = { 214 .driver = { 215 .name = "odroid-audio", 216 .of_match_table = odroid_audio_of_match, 217 .pm = &snd_soc_pm_ops, 218 }, 219 .probe = odroid_audio_probe, 220 .remove = odroid_audio_remove, 221 }; 222 module_platform_driver(odroid_audio_driver); 223 224 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>"); 225 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support"); 226 MODULE_LICENSE("GPL v2"); 227