1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Copyright (C) 2017 Samsung Electronics Co., Ltd. 4 5 #include <linux/clk.h> 6 #include <linux/clk-provider.h> 7 #include <linux/of.h> 8 #include <linux/module.h> 9 #include <sound/soc.h> 10 #include <sound/pcm_params.h> 11 #include "i2s.h" 12 #include "i2s-regs.h" 13 14 struct odroid_priv { 15 struct snd_soc_card card; 16 struct clk *clk_i2s_bus; 17 struct clk *sclk_i2s; 18 19 /* Spinlock protecting fields below */ 20 spinlock_t lock; 21 unsigned int be_sample_rate; 22 bool be_active; 23 }; 24 25 static int odroid_card_fe_startup(struct snd_pcm_substream *substream) 26 { 27 struct snd_pcm_runtime *runtime = substream->runtime; 28 29 snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2); 30 31 return 0; 32 } 33 34 static int odroid_card_fe_hw_params(struct snd_pcm_substream *substream, 35 struct snd_pcm_hw_params *params) 36 { 37 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); 38 struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card); 39 unsigned long flags; 40 int ret = 0; 41 42 spin_lock_irqsave(&priv->lock, flags); 43 if (priv->be_active && priv->be_sample_rate != params_rate(params)) 44 ret = -EINVAL; 45 spin_unlock_irqrestore(&priv->lock, flags); 46 47 return ret; 48 } 49 50 static const struct snd_soc_ops odroid_card_fe_ops = { 51 .startup = odroid_card_fe_startup, 52 .hw_params = odroid_card_fe_hw_params, 53 }; 54 55 static int odroid_card_be_hw_params(struct snd_pcm_substream *substream, 56 struct snd_pcm_hw_params *params) 57 { 58 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); 59 struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card); 60 unsigned int pll_freq, rclk_freq, rfs; 61 unsigned long flags; 62 int ret; 63 64 switch (params_rate(params)) { 65 case 64000: 66 pll_freq = 196608001U; 67 rfs = 384; 68 break; 69 case 44100: 70 case 88200: 71 pll_freq = 180633609U; 72 rfs = 512; 73 break; 74 case 32000: 75 case 48000: 76 case 96000: 77 pll_freq = 196608001U; 78 rfs = 512; 79 break; 80 default: 81 return -EINVAL; 82 } 83 84 ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1); 85 if (ret < 0) 86 return ret; 87 88 /* 89 * We add 2 to the rclk_freq value in order to avoid too low clock 90 * frequency values due to the EPLL output frequency not being exact 91 * multiple of the audio sampling rate. 92 */ 93 rclk_freq = params_rate(params) * rfs + 2; 94 95 ret = clk_set_rate(priv->sclk_i2s, rclk_freq); 96 if (ret < 0) 97 return ret; 98 99 if (rtd->dai_link->num_codecs > 1) { 100 struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 1); 101 102 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq, 103 SND_SOC_CLOCK_IN); 104 if (ret < 0) 105 return ret; 106 } 107 108 spin_lock_irqsave(&priv->lock, flags); 109 priv->be_sample_rate = params_rate(params); 110 spin_unlock_irqrestore(&priv->lock, flags); 111 112 return 0; 113 } 114 115 static int odroid_card_be_trigger(struct snd_pcm_substream *substream, int cmd) 116 { 117 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); 118 struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card); 119 unsigned long flags; 120 121 spin_lock_irqsave(&priv->lock, flags); 122 123 switch (cmd) { 124 case SNDRV_PCM_TRIGGER_START: 125 case SNDRV_PCM_TRIGGER_RESUME: 126 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 127 priv->be_active = true; 128 break; 129 130 case SNDRV_PCM_TRIGGER_STOP: 131 case SNDRV_PCM_TRIGGER_SUSPEND: 132 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 133 priv->be_active = false; 134 break; 135 } 136 137 spin_unlock_irqrestore(&priv->lock, flags); 138 139 return 0; 140 } 141 142 static const struct snd_soc_ops odroid_card_be_ops = { 143 .hw_params = odroid_card_be_hw_params, 144 .trigger = odroid_card_be_trigger, 145 }; 146 147 /* DAPM routes for backward compatibility with old DTS */ 148 static const struct snd_soc_dapm_route odroid_dapm_routes[] = { 149 { "I2S Playback", NULL, "Mixer DAI TX" }, 150 { "HiFi Playback", NULL, "Mixer DAI TX" }, 151 }; 152 153 SND_SOC_DAILINK_DEFS(primary, 154 DAILINK_COMP_ARRAY(COMP_EMPTY()), 155 DAILINK_COMP_ARRAY(COMP_DUMMY()), 156 DAILINK_COMP_ARRAY(COMP_PLATFORM("3830000.i2s"))); 157 158 SND_SOC_DAILINK_DEFS(mixer, 159 DAILINK_COMP_ARRAY(COMP_DUMMY()), 160 DAILINK_COMP_ARRAY(COMP_EMPTY())); 161 162 SND_SOC_DAILINK_DEFS(secondary, 163 DAILINK_COMP_ARRAY(COMP_EMPTY()), 164 DAILINK_COMP_ARRAY(COMP_DUMMY()), 165 DAILINK_COMP_ARRAY(COMP_PLATFORM("3830000.i2s-sec"))); 166 167 static struct snd_soc_dai_link odroid_card_dais[] = { 168 { 169 /* Primary FE <-> BE link */ 170 .ops = &odroid_card_fe_ops, 171 .name = "Primary", 172 .stream_name = "Primary", 173 .dynamic = 1, 174 .dpcm_playback = 1, 175 SND_SOC_DAILINK_REG(primary), 176 }, { 177 /* BE <-> CODECs link */ 178 .name = "I2S Mixer", 179 .ops = &odroid_card_be_ops, 180 .no_pcm = 1, 181 .dpcm_playback = 1, 182 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 183 SND_SOC_DAIFMT_CBS_CFS, 184 SND_SOC_DAILINK_REG(mixer), 185 }, { 186 /* Secondary FE <-> BE link */ 187 .playback_only = 1, 188 .ops = &odroid_card_fe_ops, 189 .name = "Secondary", 190 .stream_name = "Secondary", 191 .dynamic = 1, 192 .dpcm_playback = 1, 193 SND_SOC_DAILINK_REG(secondary), 194 } 195 }; 196 197 static int odroid_audio_probe(struct platform_device *pdev) 198 { 199 struct device *dev = &pdev->dev; 200 struct device_node *cpu_dai = NULL; 201 struct device_node *cpu, *codec; 202 struct odroid_priv *priv; 203 struct snd_soc_card *card; 204 struct snd_soc_dai_link *link, *codec_link; 205 int num_pcms, ret, i; 206 207 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 208 if (!priv) 209 return -ENOMEM; 210 211 card = &priv->card; 212 card->dev = dev; 213 214 card->owner = THIS_MODULE; 215 card->fully_routed = true; 216 217 spin_lock_init(&priv->lock); 218 snd_soc_card_set_drvdata(card, priv); 219 220 ret = snd_soc_of_parse_card_name(card, "model"); 221 if (ret < 0) 222 return ret; 223 224 if (of_property_present(dev->of_node, "samsung,audio-widgets")) { 225 ret = snd_soc_of_parse_audio_simple_widgets(card, 226 "samsung,audio-widgets"); 227 if (ret < 0) 228 return ret; 229 } 230 231 ret = 0; 232 if (of_property_present(dev->of_node, "audio-routing")) 233 ret = snd_soc_of_parse_audio_routing(card, "audio-routing"); 234 else if (of_property_present(dev->of_node, "samsung,audio-routing")) 235 ret = snd_soc_of_parse_audio_routing(card, "samsung,audio-routing"); 236 if (ret < 0) 237 return ret; 238 239 card->dai_link = odroid_card_dais; 240 card->num_links = ARRAY_SIZE(odroid_card_dais); 241 242 cpu = of_get_child_by_name(dev->of_node, "cpu"); 243 codec = of_get_child_by_name(dev->of_node, "codec"); 244 link = card->dai_link; 245 codec_link = &card->dai_link[1]; 246 247 /* 248 * For backwards compatibility create the secondary CPU DAI link only 249 * if there are 2 CPU DAI entries in the cpu sound-dai property in DT. 250 * Also add required DAPM routes not available in old DTS. 251 */ 252 num_pcms = of_count_phandle_with_args(cpu, "sound-dai", 253 "#sound-dai-cells"); 254 if (num_pcms == 1) { 255 card->dapm_routes = odroid_dapm_routes; 256 card->num_dapm_routes = ARRAY_SIZE(odroid_dapm_routes); 257 card->num_links--; 258 } 259 260 for (i = 0; i < num_pcms; i++, link += 2) { 261 ret = snd_soc_of_get_dai_name(cpu, &link->cpus->dai_name, i); 262 if (ret < 0) 263 break; 264 } 265 if (ret == 0) { 266 cpu_dai = of_parse_phandle(cpu, "sound-dai", 0); 267 if (!cpu_dai) 268 ret = -EINVAL; 269 } 270 271 of_node_put(cpu); 272 if (ret < 0) 273 goto err_put_node; 274 275 ret = snd_soc_of_get_dai_link_codecs(dev, codec, codec_link); 276 if (ret < 0) 277 goto err_put_cpu_dai; 278 279 /* Set capture capability only for boards with the MAX98090 CODEC */ 280 if (codec_link->num_codecs > 1) { 281 card->dai_link[0].dpcm_capture = 1; 282 card->dai_link[1].dpcm_capture = 1; 283 } 284 285 priv->sclk_i2s = of_clk_get_by_name(cpu_dai, "i2s_opclk1"); 286 if (IS_ERR(priv->sclk_i2s)) { 287 ret = PTR_ERR(priv->sclk_i2s); 288 goto err_put_cpu_dai; 289 } 290 291 priv->clk_i2s_bus = of_clk_get_by_name(cpu_dai, "iis"); 292 if (IS_ERR(priv->clk_i2s_bus)) { 293 ret = PTR_ERR(priv->clk_i2s_bus); 294 goto err_put_sclk; 295 } 296 297 ret = devm_snd_soc_register_card(dev, card); 298 if (ret < 0) { 299 dev_err_probe(dev, ret, "snd_soc_register_card() failed\n"); 300 goto err_put_clk_i2s; 301 } 302 303 of_node_put(cpu_dai); 304 of_node_put(codec); 305 return 0; 306 307 err_put_clk_i2s: 308 clk_put(priv->clk_i2s_bus); 309 err_put_sclk: 310 clk_put(priv->sclk_i2s); 311 err_put_cpu_dai: 312 of_node_put(cpu_dai); 313 snd_soc_of_put_dai_link_codecs(codec_link); 314 err_put_node: 315 of_node_put(codec); 316 return ret; 317 } 318 319 static void odroid_audio_remove(struct platform_device *pdev) 320 { 321 struct odroid_priv *priv = platform_get_drvdata(pdev); 322 323 snd_soc_of_put_dai_link_codecs(&priv->card.dai_link[1]); 324 clk_put(priv->sclk_i2s); 325 clk_put(priv->clk_i2s_bus); 326 } 327 328 static const struct of_device_id odroid_audio_of_match[] = { 329 { .compatible = "hardkernel,odroid-xu3-audio" }, 330 { .compatible = "hardkernel,odroid-xu4-audio" }, 331 { .compatible = "samsung,odroid-xu3-audio" }, 332 { .compatible = "samsung,odroid-xu4-audio" }, 333 { }, 334 }; 335 MODULE_DEVICE_TABLE(of, odroid_audio_of_match); 336 337 static struct platform_driver odroid_audio_driver = { 338 .driver = { 339 .name = "odroid-audio", 340 .of_match_table = odroid_audio_of_match, 341 .pm = &snd_soc_pm_ops, 342 }, 343 .probe = odroid_audio_probe, 344 .remove_new = odroid_audio_remove, 345 }; 346 module_platform_driver(odroid_audio_driver); 347 348 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>"); 349 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support"); 350 MODULE_LICENSE("GPL v2"); 351