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 codec_dai = asoc_rtd_to_codec(rtd, 0); 113 114 /* Set the MCLK rate for the codec */ 115 return snd_soc_dai_set_sysclk(codec_dai, 0, 116 FIN_PLL_RATE, SND_SOC_CLOCK_IN); 117 } 118 119 static struct snd_soc_card snow_snd = { 120 .name = "Snow-I2S", 121 .owner = THIS_MODULE, 122 .late_probe = snow_late_probe, 123 }; 124 125 static int snow_probe(struct platform_device *pdev) 126 { 127 struct device *dev = &pdev->dev; 128 struct snd_soc_card *card = &snow_snd; 129 struct device_node *cpu, *codec; 130 struct snd_soc_dai_link *link; 131 struct snow_priv *priv; 132 int ret; 133 134 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 135 if (!priv) 136 return -ENOMEM; 137 138 link = &priv->dai_link; 139 140 link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 141 SND_SOC_DAIFMT_CBS_CFS; 142 143 link->name = "Primary"; 144 link->stream_name = link->name; 145 146 link->cpus = links_cpus; 147 link->num_cpus = ARRAY_SIZE(links_cpus); 148 link->codecs = links_codecs; 149 link->num_codecs = ARRAY_SIZE(links_codecs); 150 link->platforms = links_platforms; 151 link->num_platforms = ARRAY_SIZE(links_platforms); 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->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0); 164 of_node_put(cpu); 165 166 if (!link->cpus->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->cpus->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->cpus->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->cpus->of_node); 186 return PTR_ERR(priv->clk_i2s_bus); 187 } 188 } else { 189 link->codecs->dai_name = "HiFi"; 190 191 link->cpus->of_node = of_parse_phandle(dev->of_node, 192 "samsung,i2s-controller", 0); 193 if (!link->cpus->of_node) { 194 dev_err(dev, "i2s-controller property parse error\n"); 195 return -EINVAL; 196 } 197 198 link->codecs->of_node = of_parse_phandle(dev->of_node, 199 "samsung,audio-codec", 0); 200 if (!link->codecs->of_node) { 201 of_node_put(link->cpus->of_node); 202 dev_err(dev, "audio-codec property parse error\n"); 203 return -EINVAL; 204 } 205 } 206 207 link->platforms->of_node = link->cpus->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 return dev_err_probe(&pdev->dev, ret, 217 "snd_soc_register_card failed\n"); 218 219 return ret; 220 } 221 222 static int snow_remove(struct platform_device *pdev) 223 { 224 struct snow_priv *priv = platform_get_drvdata(pdev); 225 struct snd_soc_dai_link *link = &priv->dai_link; 226 227 of_node_put(link->cpus->of_node); 228 of_node_put(link->codecs->of_node); 229 snd_soc_of_put_dai_link_codecs(link); 230 231 clk_put(priv->clk_i2s_bus); 232 233 return 0; 234 } 235 236 static const struct of_device_id snow_of_match[] = { 237 { .compatible = "google,snow-audio-max98090", }, 238 { .compatible = "google,snow-audio-max98091", }, 239 { .compatible = "google,snow-audio-max98095", }, 240 {}, 241 }; 242 MODULE_DEVICE_TABLE(of, snow_of_match); 243 244 static struct platform_driver snow_driver = { 245 .driver = { 246 .name = "snow-audio", 247 .pm = &snd_soc_pm_ops, 248 .of_match_table = snow_of_match, 249 }, 250 .probe = snow_probe, 251 .remove = snow_remove, 252 }; 253 254 module_platform_driver(snow_driver); 255 256 MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow"); 257 MODULE_LICENSE("GPL"); 258