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 SND_SOC_DAILINK_DEFS(links, 18 DAILINK_COMP_ARRAY(COMP_EMPTY()), 19 DAILINK_COMP_ARRAY(COMP_EMPTY()), 20 DAILINK_COMP_ARRAY(COMP_EMPTY())); 21 22 struct snow_priv { 23 struct snd_soc_dai_link dai_link; 24 struct clk *clk_i2s_bus; 25 }; 26 27 static int snow_card_hw_params(struct snd_pcm_substream *substream, 28 struct snd_pcm_hw_params *params) 29 { 30 static const unsigned int pll_rate[] = { 31 73728000U, 67737602U, 49152000U, 45158401U, 32768001U 32 }; 33 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 34 struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card); 35 int bfs, psr, rfs, bitwidth; 36 unsigned long int rclk; 37 long int freq = -EINVAL; 38 int ret, i; 39 40 bitwidth = snd_pcm_format_width(params_format(params)); 41 if (bitwidth < 0) { 42 dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth); 43 return bitwidth; 44 } 45 46 if (bitwidth != 16 && bitwidth != 24) { 47 dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth); 48 return -EINVAL; 49 } 50 51 bfs = 2 * bitwidth; 52 53 switch (params_rate(params)) { 54 case 16000: 55 case 22050: 56 case 24000: 57 case 32000: 58 case 44100: 59 case 48000: 60 case 88200: 61 case 96000: 62 rfs = 8 * bfs; 63 break; 64 case 64000: 65 rfs = 384; 66 break; 67 case 8000: 68 case 11025: 69 case 12000: 70 rfs = 16 * bfs; 71 break; 72 default: 73 return -EINVAL; 74 } 75 76 rclk = params_rate(params) * rfs; 77 78 for (psr = 8; psr > 0; psr /= 2) { 79 for (i = 0; i < ARRAY_SIZE(pll_rate); i++) { 80 if ((pll_rate[i] - rclk * psr) <= 2) { 81 freq = pll_rate[i]; 82 break; 83 } 84 } 85 } 86 if (freq < 0) { 87 dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk); 88 return -EINVAL; 89 } 90 91 ret = clk_set_rate(priv->clk_i2s_bus, freq); 92 if (ret < 0) { 93 dev_err(rtd->card->dev, "I2S bus clock rate set failed\n"); 94 return ret; 95 } 96 97 return 0; 98 } 99 100 static const struct snd_soc_ops snow_card_ops = { 101 .hw_params = snow_card_hw_params, 102 }; 103 104 static int snow_late_probe(struct snd_soc_card *card) 105 { 106 struct snd_soc_pcm_runtime *rtd; 107 struct snd_soc_dai *codec_dai; 108 109 rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]); 110 111 /* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */ 112 if (rtd->num_codecs > 1) 113 codec_dai = asoc_rtd_to_codec(rtd, 0); 114 else 115 codec_dai = asoc_rtd_to_codec(rtd, 0); 116 117 /* Set the MCLK rate for the codec */ 118 return snd_soc_dai_set_sysclk(codec_dai, 0, 119 FIN_PLL_RATE, SND_SOC_CLOCK_IN); 120 } 121 122 static struct snd_soc_card snow_snd = { 123 .name = "Snow-I2S", 124 .owner = THIS_MODULE, 125 .late_probe = snow_late_probe, 126 }; 127 128 static int snow_probe(struct platform_device *pdev) 129 { 130 struct device *dev = &pdev->dev; 131 struct snd_soc_card *card = &snow_snd; 132 struct device_node *cpu, *codec; 133 struct snd_soc_dai_link *link; 134 struct snow_priv *priv; 135 int ret; 136 137 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 138 if (!priv) 139 return -ENOMEM; 140 141 link = &priv->dai_link; 142 143 link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 144 SND_SOC_DAIFMT_CBS_CFS; 145 146 link->name = "Primary"; 147 link->stream_name = link->name; 148 149 link->cpus = links_cpus; 150 link->num_cpus = ARRAY_SIZE(links_cpus); 151 link->codecs = links_codecs; 152 link->num_codecs = ARRAY_SIZE(links_codecs); 153 link->platforms = links_platforms; 154 link->num_platforms = ARRAY_SIZE(links_platforms); 155 156 card->dai_link = link; 157 card->num_links = 1; 158 card->dev = dev; 159 160 /* Try new DT bindings with HDMI support first. */ 161 cpu = of_get_child_by_name(dev->of_node, "cpu"); 162 163 if (cpu) { 164 link->ops = &snow_card_ops; 165 166 link->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0); 167 of_node_put(cpu); 168 169 if (!link->cpus->of_node) { 170 dev_err(dev, "Failed parsing cpu/sound-dai property\n"); 171 return -EINVAL; 172 } 173 174 codec = of_get_child_by_name(dev->of_node, "codec"); 175 ret = snd_soc_of_get_dai_link_codecs(dev, codec, link); 176 of_node_put(codec); 177 178 if (ret < 0) { 179 of_node_put(link->cpus->of_node); 180 dev_err(dev, "Failed parsing codec node\n"); 181 return ret; 182 } 183 184 priv->clk_i2s_bus = of_clk_get_by_name(link->cpus->of_node, 185 "i2s_opclk0"); 186 if (IS_ERR(priv->clk_i2s_bus)) { 187 snd_soc_of_put_dai_link_codecs(link); 188 of_node_put(link->cpus->of_node); 189 return PTR_ERR(priv->clk_i2s_bus); 190 } 191 } else { 192 link->codecs->dai_name = "HiFi", 193 194 link->cpus->of_node = of_parse_phandle(dev->of_node, 195 "samsung,i2s-controller", 0); 196 if (!link->cpus->of_node) { 197 dev_err(dev, "i2s-controller property parse error\n"); 198 return -EINVAL; 199 } 200 201 link->codecs->of_node = of_parse_phandle(dev->of_node, 202 "samsung,audio-codec", 0); 203 if (!link->codecs->of_node) { 204 of_node_put(link->cpus->of_node); 205 dev_err(dev, "audio-codec property parse error\n"); 206 return -EINVAL; 207 } 208 } 209 210 link->platforms->of_node = link->cpus->of_node; 211 212 /* Update card-name if provided through DT, else use default name */ 213 snd_soc_of_parse_card_name(card, "samsung,model"); 214 215 snd_soc_card_set_drvdata(card, priv); 216 217 ret = devm_snd_soc_register_card(dev, card); 218 if (ret) { 219 if (ret != -EPROBE_DEFER) 220 dev_err(&pdev->dev, 221 "snd_soc_register_card failed (%d)\n", ret); 222 return ret; 223 } 224 225 return ret; 226 } 227 228 static int snow_remove(struct platform_device *pdev) 229 { 230 struct snow_priv *priv = platform_get_drvdata(pdev); 231 struct snd_soc_dai_link *link = &priv->dai_link; 232 233 of_node_put(link->cpus->of_node); 234 of_node_put(link->codecs->of_node); 235 snd_soc_of_put_dai_link_codecs(link); 236 237 clk_put(priv->clk_i2s_bus); 238 239 return 0; 240 } 241 242 static const struct of_device_id snow_of_match[] = { 243 { .compatible = "google,snow-audio-max98090", }, 244 { .compatible = "google,snow-audio-max98091", }, 245 { .compatible = "google,snow-audio-max98095", }, 246 {}, 247 }; 248 MODULE_DEVICE_TABLE(of, snow_of_match); 249 250 static struct platform_driver snow_driver = { 251 .driver = { 252 .name = "snow-audio", 253 .pm = &snd_soc_pm_ops, 254 .of_match_table = snow_of_match, 255 }, 256 .probe = snow_probe, 257 .remove = snow_remove, 258 }; 259 260 module_platform_driver(snow_driver); 261 262 MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow"); 263 MODULE_LICENSE("GPL"); 264