1 /* 2 * ASoC machine driver for Snow boards 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * version 2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 */ 13 14 #include <linux/clk.h> 15 #include <linux/module.h> 16 #include <linux/platform_device.h> 17 #include <linux/of.h> 18 #include <linux/of_device.h> 19 #include <sound/pcm_params.h> 20 #include <sound/soc.h> 21 22 #include "i2s.h" 23 24 #define FIN_PLL_RATE 24000000 25 26 struct snow_priv { 27 struct snd_soc_dai_link dai_link; 28 struct clk *clk_i2s_bus; 29 }; 30 31 static int snow_card_hw_params(struct snd_pcm_substream *substream, 32 struct snd_pcm_hw_params *params) 33 { 34 static const unsigned int pll_rate[] = { 35 73728000U, 67737602U, 49152000U, 45158401U, 32768001U 36 }; 37 struct snd_soc_pcm_runtime *rtd = substream->private_data; 38 struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card); 39 int bfs, psr, rfs, bitwidth; 40 unsigned long int rclk; 41 long int freq = -EINVAL; 42 int ret, i; 43 44 bitwidth = snd_pcm_format_width(params_format(params)); 45 if (bitwidth < 0) { 46 dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth); 47 return bitwidth; 48 } 49 50 if (bitwidth != 16 && bitwidth != 24) { 51 dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth); 52 return -EINVAL; 53 } 54 55 bfs = 2 * bitwidth; 56 57 switch (params_rate(params)) { 58 case 16000: 59 case 22050: 60 case 24000: 61 case 32000: 62 case 44100: 63 case 48000: 64 case 88200: 65 case 96000: 66 rfs = 8 * bfs; 67 break; 68 case 64000: 69 rfs = 384; 70 break; 71 case 8000: 72 case 11025: 73 case 12000: 74 rfs = 16 * bfs; 75 break; 76 default: 77 return -EINVAL; 78 } 79 80 rclk = params_rate(params) * rfs; 81 82 for (psr = 8; psr > 0; psr /= 2) { 83 for (i = 0; i < ARRAY_SIZE(pll_rate); i++) { 84 if ((pll_rate[i] - rclk * psr) <= 2) { 85 freq = pll_rate[i]; 86 break; 87 } 88 } 89 } 90 if (freq < 0) { 91 dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk); 92 return -EINVAL; 93 } 94 95 ret = clk_set_rate(priv->clk_i2s_bus, freq); 96 if (ret < 0) { 97 dev_err(rtd->card->dev, "I2S bus clock rate set failed\n"); 98 return ret; 99 } 100 101 return 0; 102 } 103 104 static const struct snd_soc_ops snow_card_ops = { 105 .hw_params = snow_card_hw_params, 106 }; 107 108 static int snow_late_probe(struct snd_soc_card *card) 109 { 110 struct snd_soc_pcm_runtime *rtd; 111 struct snd_soc_dai *codec_dai; 112 113 rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name); 114 115 /* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */ 116 if (rtd->num_codecs > 1) 117 codec_dai = rtd->codec_dais[0]; 118 else 119 codec_dai = rtd->codec_dai; 120 121 /* Set the MCLK rate for the codec */ 122 return snd_soc_dai_set_sysclk(codec_dai, 0, 123 FIN_PLL_RATE, SND_SOC_CLOCK_IN); 124 } 125 126 static struct snd_soc_card snow_snd = { 127 .name = "Snow-I2S", 128 .owner = THIS_MODULE, 129 .late_probe = snow_late_probe, 130 }; 131 132 static int snow_probe(struct platform_device *pdev) 133 { 134 struct device *dev = &pdev->dev; 135 struct snd_soc_card *card = &snow_snd; 136 struct device_node *cpu, *codec; 137 struct snd_soc_dai_link *link; 138 struct snow_priv *priv; 139 int ret; 140 141 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 142 if (!priv) 143 return -ENOMEM; 144 145 link = &priv->dai_link; 146 147 link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 148 SND_SOC_DAIFMT_CBS_CFS; 149 150 link->name = "Primary"; 151 link->stream_name = link->name; 152 153 card->dai_link = link; 154 card->num_links = 1; 155 card->dev = dev; 156 157 /* Try new DT bindings with HDMI support first. */ 158 cpu = of_get_child_by_name(dev->of_node, "cpu"); 159 160 if (cpu) { 161 link->ops = &snow_card_ops; 162 163 link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0); 164 of_node_put(cpu); 165 166 if (!link->cpu_of_node) { 167 dev_err(dev, "Failed parsing cpu/sound-dai property\n"); 168 return -EINVAL; 169 } 170 171 codec = of_get_child_by_name(dev->of_node, "codec"); 172 ret = snd_soc_of_get_dai_link_codecs(dev, codec, link); 173 of_node_put(codec); 174 175 if (ret < 0) { 176 of_node_put(link->cpu_of_node); 177 dev_err(dev, "Failed parsing codec node\n"); 178 return ret; 179 } 180 181 priv->clk_i2s_bus = of_clk_get_by_name(link->cpu_of_node, 182 "i2s_opclk0"); 183 if (IS_ERR(priv->clk_i2s_bus)) { 184 snd_soc_of_put_dai_link_codecs(link); 185 of_node_put(link->cpu_of_node); 186 return PTR_ERR(priv->clk_i2s_bus); 187 } 188 } else { 189 link->codec_dai_name = "HiFi", 190 191 link->cpu_of_node = of_parse_phandle(dev->of_node, 192 "samsung,i2s-controller", 0); 193 if (!link->cpu_of_node) { 194 dev_err(dev, "i2s-controller property parse error\n"); 195 return -EINVAL; 196 } 197 198 link->codec_of_node = of_parse_phandle(dev->of_node, 199 "samsung,audio-codec", 0); 200 if (!link->codec_of_node) { 201 of_node_put(link->cpu_of_node); 202 dev_err(dev, "audio-codec property parse error\n"); 203 return -EINVAL; 204 } 205 } 206 207 link->platform_of_node = link->cpu_of_node; 208 209 /* Update card-name if provided through DT, else use default name */ 210 snd_soc_of_parse_card_name(card, "samsung,model"); 211 212 snd_soc_card_set_drvdata(card, priv); 213 214 ret = devm_snd_soc_register_card(dev, card); 215 if (ret) { 216 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret); 217 return ret; 218 } 219 220 return ret; 221 } 222 223 static int snow_remove(struct platform_device *pdev) 224 { 225 struct snow_priv *priv = platform_get_drvdata(pdev); 226 struct snd_soc_dai_link *link = &priv->dai_link; 227 228 of_node_put(link->cpu_of_node); 229 of_node_put(link->codec_of_node); 230 snd_soc_of_put_dai_link_codecs(link); 231 232 clk_put(priv->clk_i2s_bus); 233 234 return 0; 235 } 236 237 static const struct of_device_id snow_of_match[] = { 238 { .compatible = "google,snow-audio-max98090", }, 239 { .compatible = "google,snow-audio-max98091", }, 240 { .compatible = "google,snow-audio-max98095", }, 241 {}, 242 }; 243 MODULE_DEVICE_TABLE(of, snow_of_match); 244 245 static struct platform_driver snow_driver = { 246 .driver = { 247 .name = "snow-audio", 248 .pm = &snd_soc_pm_ops, 249 .of_match_table = snow_of_match, 250 }, 251 .probe = snow_probe, 252 .remove = snow_remove, 253 }; 254 255 module_platform_driver(snow_driver); 256 257 MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow"); 258 MODULE_LICENSE("GPL"); 259