1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // ASoC machine driver for Snow boards 4 5 #include <linux/clk.h> 6 #include <linux/module.h> 7 #include <linux/platform_device.h> 8 #include <linux/of.h> 9 #include <linux/of_device.h> 10 #include <sound/pcm_params.h> 11 #include <sound/soc.h> 12 13 #include "i2s.h" 14 15 #define FIN_PLL_RATE 24000000 16 17 struct snow_priv { 18 struct snd_soc_dai_link dai_link; 19 struct clk *clk_i2s_bus; 20 }; 21 22 static int snow_card_hw_params(struct snd_pcm_substream *substream, 23 struct snd_pcm_hw_params *params) 24 { 25 static const unsigned int pll_rate[] = { 26 73728000U, 67737602U, 49152000U, 45158401U, 32768001U 27 }; 28 struct snd_soc_pcm_runtime *rtd = substream->private_data; 29 struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card); 30 int bfs, psr, rfs, bitwidth; 31 unsigned long int rclk; 32 long int freq = -EINVAL; 33 int ret, i; 34 35 bitwidth = snd_pcm_format_width(params_format(params)); 36 if (bitwidth < 0) { 37 dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth); 38 return bitwidth; 39 } 40 41 if (bitwidth != 16 && bitwidth != 24) { 42 dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth); 43 return -EINVAL; 44 } 45 46 bfs = 2 * bitwidth; 47 48 switch (params_rate(params)) { 49 case 16000: 50 case 22050: 51 case 24000: 52 case 32000: 53 case 44100: 54 case 48000: 55 case 88200: 56 case 96000: 57 rfs = 8 * bfs; 58 break; 59 case 64000: 60 rfs = 384; 61 break; 62 case 8000: 63 case 11025: 64 case 12000: 65 rfs = 16 * bfs; 66 break; 67 default: 68 return -EINVAL; 69 } 70 71 rclk = params_rate(params) * rfs; 72 73 for (psr = 8; psr > 0; psr /= 2) { 74 for (i = 0; i < ARRAY_SIZE(pll_rate); i++) { 75 if ((pll_rate[i] - rclk * psr) <= 2) { 76 freq = pll_rate[i]; 77 break; 78 } 79 } 80 } 81 if (freq < 0) { 82 dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk); 83 return -EINVAL; 84 } 85 86 ret = clk_set_rate(priv->clk_i2s_bus, freq); 87 if (ret < 0) { 88 dev_err(rtd->card->dev, "I2S bus clock rate set failed\n"); 89 return ret; 90 } 91 92 return 0; 93 } 94 95 static const struct snd_soc_ops snow_card_ops = { 96 .hw_params = snow_card_hw_params, 97 }; 98 99 static int snow_late_probe(struct snd_soc_card *card) 100 { 101 struct snd_soc_pcm_runtime *rtd; 102 struct snd_soc_dai *codec_dai; 103 104 rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name); 105 106 /* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */ 107 if (rtd->num_codecs > 1) 108 codec_dai = rtd->codec_dais[0]; 109 else 110 codec_dai = rtd->codec_dai; 111 112 /* Set the MCLK rate for the codec */ 113 return snd_soc_dai_set_sysclk(codec_dai, 0, 114 FIN_PLL_RATE, SND_SOC_CLOCK_IN); 115 } 116 117 static struct snd_soc_card snow_snd = { 118 .name = "Snow-I2S", 119 .owner = THIS_MODULE, 120 .late_probe = snow_late_probe, 121 }; 122 123 static int snow_probe(struct platform_device *pdev) 124 { 125 struct device *dev = &pdev->dev; 126 struct snd_soc_card *card = &snow_snd; 127 struct device_node *cpu, *codec; 128 struct snd_soc_dai_link *link; 129 struct snow_priv *priv; 130 int ret; 131 132 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 133 if (!priv) 134 return -ENOMEM; 135 136 link = &priv->dai_link; 137 138 link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 139 SND_SOC_DAIFMT_CBS_CFS; 140 141 link->name = "Primary"; 142 link->stream_name = link->name; 143 144 card->dai_link = link; 145 card->num_links = 1; 146 card->dev = dev; 147 148 /* Try new DT bindings with HDMI support first. */ 149 cpu = of_get_child_by_name(dev->of_node, "cpu"); 150 151 if (cpu) { 152 link->ops = &snow_card_ops; 153 154 link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0); 155 of_node_put(cpu); 156 157 if (!link->cpu_of_node) { 158 dev_err(dev, "Failed parsing cpu/sound-dai property\n"); 159 return -EINVAL; 160 } 161 162 codec = of_get_child_by_name(dev->of_node, "codec"); 163 ret = snd_soc_of_get_dai_link_codecs(dev, codec, link); 164 of_node_put(codec); 165 166 if (ret < 0) { 167 of_node_put(link->cpu_of_node); 168 dev_err(dev, "Failed parsing codec node\n"); 169 return ret; 170 } 171 172 priv->clk_i2s_bus = of_clk_get_by_name(link->cpu_of_node, 173 "i2s_opclk0"); 174 if (IS_ERR(priv->clk_i2s_bus)) { 175 snd_soc_of_put_dai_link_codecs(link); 176 of_node_put(link->cpu_of_node); 177 return PTR_ERR(priv->clk_i2s_bus); 178 } 179 } else { 180 link->codec_dai_name = "HiFi", 181 182 link->cpu_of_node = of_parse_phandle(dev->of_node, 183 "samsung,i2s-controller", 0); 184 if (!link->cpu_of_node) { 185 dev_err(dev, "i2s-controller property parse error\n"); 186 return -EINVAL; 187 } 188 189 link->codec_of_node = of_parse_phandle(dev->of_node, 190 "samsung,audio-codec", 0); 191 if (!link->codec_of_node) { 192 of_node_put(link->cpu_of_node); 193 dev_err(dev, "audio-codec property parse error\n"); 194 return -EINVAL; 195 } 196 } 197 198 link->platform_of_node = link->cpu_of_node; 199 200 /* Update card-name if provided through DT, else use default name */ 201 snd_soc_of_parse_card_name(card, "samsung,model"); 202 203 snd_soc_card_set_drvdata(card, priv); 204 205 ret = devm_snd_soc_register_card(dev, card); 206 if (ret) { 207 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret); 208 return ret; 209 } 210 211 return ret; 212 } 213 214 static int snow_remove(struct platform_device *pdev) 215 { 216 struct snow_priv *priv = platform_get_drvdata(pdev); 217 struct snd_soc_dai_link *link = &priv->dai_link; 218 219 of_node_put(link->cpu_of_node); 220 of_node_put(link->codec_of_node); 221 snd_soc_of_put_dai_link_codecs(link); 222 223 clk_put(priv->clk_i2s_bus); 224 225 return 0; 226 } 227 228 static const struct of_device_id snow_of_match[] = { 229 { .compatible = "google,snow-audio-max98090", }, 230 { .compatible = "google,snow-audio-max98091", }, 231 { .compatible = "google,snow-audio-max98095", }, 232 {}, 233 }; 234 MODULE_DEVICE_TABLE(of, snow_of_match); 235 236 static struct platform_driver snow_driver = { 237 .driver = { 238 .name = "snow-audio", 239 .pm = &snd_soc_pm_ops, 240 .of_match_table = snow_of_match, 241 }, 242 .probe = snow_probe, 243 .remove = snow_remove, 244 }; 245 246 module_platform_driver(snow_driver); 247 248 MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow"); 249 MODULE_LICENSE("GPL"); 250