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 <sound/pcm_params.h> 10 #include <sound/soc.h> 11 12 #include "i2s.h" 13 14 #define FIN_PLL_RATE 24000000 15 16 SND_SOC_DAILINK_DEFS(links, 17 DAILINK_COMP_ARRAY(COMP_EMPTY()), 18 DAILINK_COMP_ARRAY(COMP_EMPTY()), 19 DAILINK_COMP_ARRAY(COMP_EMPTY())); 20 21 struct snow_priv { 22 struct snd_soc_dai_link dai_link; 23 struct clk *clk_i2s_bus; 24 }; 25 26 static int snow_card_hw_params(struct snd_pcm_substream *substream, 27 struct snd_pcm_hw_params *params) 28 { 29 static const unsigned int pll_rate[] = { 30 73728000U, 67737602U, 49152000U, 45158401U, 32768001U 31 }; 32 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); 33 struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card); 34 int bfs, psr, rfs, bitwidth; 35 unsigned long int rclk; 36 long int freq = -EINVAL; 37 int ret, i; 38 39 bitwidth = snd_pcm_format_width(params_format(params)); 40 if (bitwidth < 0) { 41 dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth); 42 return bitwidth; 43 } 44 45 if (bitwidth != 16 && bitwidth != 24) { 46 dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth); 47 return -EINVAL; 48 } 49 50 bfs = 2 * bitwidth; 51 52 switch (params_rate(params)) { 53 case 16000: 54 case 22050: 55 case 24000: 56 case 32000: 57 case 44100: 58 case 48000: 59 case 88200: 60 case 96000: 61 rfs = 8 * bfs; 62 break; 63 case 64000: 64 rfs = 384; 65 break; 66 case 8000: 67 case 11025: 68 case 12000: 69 rfs = 16 * bfs; 70 break; 71 default: 72 return -EINVAL; 73 } 74 75 rclk = params_rate(params) * rfs; 76 77 for (psr = 8; psr > 0; psr /= 2) { 78 for (i = 0; i < ARRAY_SIZE(pll_rate); i++) { 79 if ((pll_rate[i] - rclk * psr) <= 2) { 80 freq = pll_rate[i]; 81 break; 82 } 83 } 84 } 85 if (freq < 0) { 86 dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk); 87 return -EINVAL; 88 } 89 90 ret = clk_set_rate(priv->clk_i2s_bus, freq); 91 if (ret < 0) { 92 dev_err(rtd->card->dev, "I2S bus clock rate set failed\n"); 93 return ret; 94 } 95 96 return 0; 97 } 98 99 static const struct snd_soc_ops snow_card_ops = { 100 .hw_params = snow_card_hw_params, 101 }; 102 103 static int snow_late_probe(struct snd_soc_card *card) 104 { 105 struct snd_soc_pcm_runtime *rtd; 106 struct snd_soc_dai *codec_dai; 107 108 rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]); 109 110 /* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */ 111 codec_dai = snd_soc_rtd_to_codec(rtd, 0); 112 113 /* Set the MCLK rate for the codec */ 114 return snd_soc_dai_set_sysclk(codec_dai, 0, 115 FIN_PLL_RATE, SND_SOC_CLOCK_IN); 116 } 117 118 static struct snd_soc_card snow_snd = { 119 .name = "Snow-I2S", 120 .owner = THIS_MODULE, 121 .late_probe = snow_late_probe, 122 }; 123 124 static int snow_probe(struct platform_device *pdev) 125 { 126 struct device *dev = &pdev->dev; 127 struct snd_soc_card *card = &snow_snd; 128 struct device_node *cpu, *codec; 129 struct snd_soc_dai_link *link; 130 struct snow_priv *priv; 131 int ret; 132 133 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 134 if (!priv) 135 return -ENOMEM; 136 137 link = &priv->dai_link; 138 139 link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 140 SND_SOC_DAIFMT_CBS_CFS; 141 142 link->name = "Primary"; 143 link->stream_name = link->name; 144 145 link->cpus = links_cpus; 146 link->num_cpus = ARRAY_SIZE(links_cpus); 147 link->codecs = links_codecs; 148 link->num_codecs = ARRAY_SIZE(links_codecs); 149 link->platforms = links_platforms; 150 link->num_platforms = ARRAY_SIZE(links_platforms); 151 152 card->dai_link = link; 153 card->num_links = 1; 154 card->dev = dev; 155 156 /* Try new DT bindings with HDMI support first. */ 157 cpu = of_get_child_by_name(dev->of_node, "cpu"); 158 159 if (cpu) { 160 link->ops = &snow_card_ops; 161 162 link->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0); 163 of_node_put(cpu); 164 165 if (!link->cpus->of_node) { 166 dev_err(dev, "Failed parsing cpu/sound-dai property\n"); 167 return -EINVAL; 168 } 169 170 codec = of_get_child_by_name(dev->of_node, "codec"); 171 ret = snd_soc_of_get_dai_link_codecs(dev, codec, link); 172 of_node_put(codec); 173 174 if (ret < 0) { 175 of_node_put(link->cpus->of_node); 176 dev_err(dev, "Failed parsing codec node\n"); 177 return ret; 178 } 179 180 priv->clk_i2s_bus = of_clk_get_by_name(link->cpus->of_node, 181 "i2s_opclk0"); 182 if (IS_ERR(priv->clk_i2s_bus)) { 183 snd_soc_of_put_dai_link_codecs(link); 184 of_node_put(link->cpus->of_node); 185 return PTR_ERR(priv->clk_i2s_bus); 186 } 187 } else { 188 link->codecs->dai_name = "HiFi"; 189 190 link->cpus->of_node = of_parse_phandle(dev->of_node, 191 "samsung,i2s-controller", 0); 192 if (!link->cpus->of_node) { 193 dev_err(dev, "i2s-controller property parse error\n"); 194 return -EINVAL; 195 } 196 197 link->codecs->of_node = of_parse_phandle(dev->of_node, 198 "samsung,audio-codec", 0); 199 if (!link->codecs->of_node) { 200 of_node_put(link->cpus->of_node); 201 dev_err(dev, "audio-codec property parse error\n"); 202 return -EINVAL; 203 } 204 } 205 206 link->platforms->of_node = link->cpus->of_node; 207 208 /* Update card-name if provided through DT, else use default name */ 209 snd_soc_of_parse_card_name(card, "samsung,model"); 210 211 snd_soc_card_set_drvdata(card, priv); 212 213 ret = devm_snd_soc_register_card(dev, card); 214 if (ret) 215 return dev_err_probe(&pdev->dev, ret, 216 "snd_soc_register_card failed\n"); 217 218 return 0; 219 } 220 221 static void snow_remove(struct platform_device *pdev) 222 { 223 struct snow_priv *priv = platform_get_drvdata(pdev); 224 struct snd_soc_dai_link *link = &priv->dai_link; 225 226 of_node_put(link->cpus->of_node); 227 of_node_put(link->codecs->of_node); 228 snd_soc_of_put_dai_link_codecs(link); 229 230 clk_put(priv->clk_i2s_bus); 231 } 232 233 static const struct of_device_id snow_of_match[] = { 234 { .compatible = "google,snow-audio-max98090", }, 235 { .compatible = "google,snow-audio-max98091", }, 236 { .compatible = "google,snow-audio-max98095", }, 237 {}, 238 }; 239 MODULE_DEVICE_TABLE(of, snow_of_match); 240 241 static struct platform_driver snow_driver = { 242 .driver = { 243 .name = "snow-audio", 244 .pm = &snd_soc_pm_ops, 245 .of_match_table = snow_of_match, 246 }, 247 .probe = snow_probe, 248 .remove = snow_remove, 249 }; 250 251 module_platform_driver(snow_driver); 252 253 MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow"); 254 MODULE_LICENSE("GPL"); 255