1 // SPDX-License-Identifier: (GPL-2.0 OR MIT) 2 // 3 // Copyright (c) 2018 BayLibre, SAS. 4 // Author: Jerome Brunet <jbrunet@baylibre.com> 5 6 #include <linux/clk.h> 7 #include <linux/module.h> 8 #include <linux/of_platform.h> 9 #include <linux/regmap.h> 10 #include <sound/soc.h> 11 #include <sound/soc-dai.h> 12 #include <sound/pcm_params.h> 13 #include <sound/pcm_iec958.h> 14 15 /* 16 * NOTE: 17 * The meaning of bits SPDIFOUT_CTRL0_XXX_SEL is actually the opposite 18 * of what the documentation says. Manual control on V, U and C bits is 19 * applied when the related sel bits are cleared 20 */ 21 22 #define SPDIFOUT_STAT 0x00 23 #define SPDIFOUT_GAIN0 0x04 24 #define SPDIFOUT_GAIN1 0x08 25 #define SPDIFOUT_CTRL0 0x0c 26 #define SPDIFOUT_CTRL0_EN BIT(31) 27 #define SPDIFOUT_CTRL0_RST_OUT BIT(29) 28 #define SPDIFOUT_CTRL0_RST_IN BIT(28) 29 #define SPDIFOUT_CTRL0_USEL BIT(26) 30 #define SPDIFOUT_CTRL0_USET BIT(25) 31 #define SPDIFOUT_CTRL0_CHSTS_SEL BIT(24) 32 #define SPDIFOUT_CTRL0_DATA_SEL BIT(20) 33 #define SPDIFOUT_CTRL0_MSB_FIRST BIT(19) 34 #define SPDIFOUT_CTRL0_VSEL BIT(18) 35 #define SPDIFOUT_CTRL0_VSET BIT(17) 36 #define SPDIFOUT_CTRL0_MASK_MASK GENMASK(11, 4) 37 #define SPDIFOUT_CTRL0_MASK(x) ((x) << 4) 38 #define SPDIFOUT_CTRL1 0x10 39 #define SPDIFOUT_CTRL1_MSB_POS_MASK GENMASK(12, 8) 40 #define SPDIFOUT_CTRL1_MSB_POS(x) ((x) << 8) 41 #define SPDIFOUT_CTRL1_TYPE_MASK GENMASK(6, 4) 42 #define SPDIFOUT_CTRL1_TYPE(x) ((x) << 4) 43 #define SPDIFOUT_PREAMB 0x14 44 #define SPDIFOUT_SWAP 0x18 45 #define SPDIFOUT_CHSTS0 0x1c 46 #define SPDIFOUT_CHSTS1 0x20 47 #define SPDIFOUT_CHSTS2 0x24 48 #define SPDIFOUT_CHSTS3 0x28 49 #define SPDIFOUT_CHSTS4 0x2c 50 #define SPDIFOUT_CHSTS5 0x30 51 #define SPDIFOUT_CHSTS6 0x34 52 #define SPDIFOUT_CHSTS7 0x38 53 #define SPDIFOUT_CHSTS8 0x3c 54 #define SPDIFOUT_CHSTS9 0x40 55 #define SPDIFOUT_CHSTSA 0x44 56 #define SPDIFOUT_CHSTSB 0x48 57 #define SPDIFOUT_MUTE_VAL 0x4c 58 59 struct axg_spdifout { 60 struct regmap *map; 61 struct clk *mclk; 62 struct clk *pclk; 63 }; 64 65 static void axg_spdifout_enable(struct regmap *map) 66 { 67 /* Apply both reset */ 68 regmap_update_bits(map, SPDIFOUT_CTRL0, 69 SPDIFOUT_CTRL0_RST_OUT | SPDIFOUT_CTRL0_RST_IN, 70 0); 71 72 /* Clear out reset before in reset */ 73 regmap_update_bits(map, SPDIFOUT_CTRL0, 74 SPDIFOUT_CTRL0_RST_OUT, SPDIFOUT_CTRL0_RST_OUT); 75 regmap_update_bits(map, SPDIFOUT_CTRL0, 76 SPDIFOUT_CTRL0_RST_IN, SPDIFOUT_CTRL0_RST_IN); 77 78 /* Enable spdifout */ 79 regmap_update_bits(map, SPDIFOUT_CTRL0, SPDIFOUT_CTRL0_EN, 80 SPDIFOUT_CTRL0_EN); 81 } 82 83 static void axg_spdifout_disable(struct regmap *map) 84 { 85 regmap_update_bits(map, SPDIFOUT_CTRL0, SPDIFOUT_CTRL0_EN, 0); 86 } 87 88 static int axg_spdifout_trigger(struct snd_pcm_substream *substream, int cmd, 89 struct snd_soc_dai *dai) 90 { 91 struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai); 92 93 switch (cmd) { 94 case SNDRV_PCM_TRIGGER_START: 95 case SNDRV_PCM_TRIGGER_RESUME: 96 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 97 axg_spdifout_enable(priv->map); 98 return 0; 99 100 case SNDRV_PCM_TRIGGER_STOP: 101 case SNDRV_PCM_TRIGGER_SUSPEND: 102 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 103 axg_spdifout_disable(priv->map); 104 return 0; 105 106 default: 107 return -EINVAL; 108 } 109 } 110 111 static int axg_spdifout_digital_mute(struct snd_soc_dai *dai, int mute) 112 { 113 struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai); 114 115 /* Use spdif valid bit to perform digital mute */ 116 regmap_update_bits(priv->map, SPDIFOUT_CTRL0, SPDIFOUT_CTRL0_VSET, 117 mute ? SPDIFOUT_CTRL0_VSET : 0); 118 119 return 0; 120 } 121 122 static int axg_spdifout_sample_fmt(struct snd_pcm_hw_params *params, 123 struct snd_soc_dai *dai) 124 { 125 struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai); 126 unsigned int val; 127 128 /* Set the samples spdifout will pull from the FIFO */ 129 switch (params_channels(params)) { 130 case 1: 131 val = SPDIFOUT_CTRL0_MASK(0x1); 132 break; 133 case 2: 134 val = SPDIFOUT_CTRL0_MASK(0x3); 135 break; 136 default: 137 dev_err(dai->dev, "too many channels for spdif dai: %u\n", 138 params_channels(params)); 139 return -EINVAL; 140 } 141 142 regmap_update_bits(priv->map, SPDIFOUT_CTRL0, 143 SPDIFOUT_CTRL0_MASK_MASK, val); 144 145 /* FIFO data are arranged in chunks of 64bits */ 146 switch (params_physical_width(params)) { 147 case 8: 148 /* 8 samples of 8 bits */ 149 val = SPDIFOUT_CTRL1_TYPE(0); 150 break; 151 case 16: 152 /* 4 samples of 16 bits - right justified */ 153 val = SPDIFOUT_CTRL1_TYPE(2); 154 break; 155 case 32: 156 /* 2 samples of 32 bits - right justified */ 157 val = SPDIFOUT_CTRL1_TYPE(4); 158 break; 159 default: 160 dev_err(dai->dev, "Unsupported physical width: %u\n", 161 params_physical_width(params)); 162 return -EINVAL; 163 } 164 165 /* Position of the MSB in FIFO samples */ 166 val |= SPDIFOUT_CTRL1_MSB_POS(params_width(params) - 1); 167 168 regmap_update_bits(priv->map, SPDIFOUT_CTRL1, 169 SPDIFOUT_CTRL1_MSB_POS_MASK | 170 SPDIFOUT_CTRL1_TYPE_MASK, val); 171 172 regmap_update_bits(priv->map, SPDIFOUT_CTRL0, 173 SPDIFOUT_CTRL0_MSB_FIRST | SPDIFOUT_CTRL0_DATA_SEL, 174 0); 175 176 return 0; 177 } 178 179 static int axg_spdifout_set_chsts(struct snd_pcm_hw_params *params, 180 struct snd_soc_dai *dai) 181 { 182 struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai); 183 unsigned int offset; 184 int ret; 185 u8 cs[4]; 186 u32 val; 187 188 ret = snd_pcm_create_iec958_consumer_hw_params(params, cs, 4); 189 if (ret < 0) { 190 dev_err(dai->dev, "Creating IEC958 channel status failed %d\n", 191 ret); 192 return ret; 193 } 194 val = cs[0] | cs[1] << 8 | cs[2] << 16 | cs[3] << 24; 195 196 /* Setup channel status A bits [31 - 0]*/ 197 regmap_write(priv->map, SPDIFOUT_CHSTS0, val); 198 199 /* Clear channel status A bits [191 - 32] */ 200 for (offset = SPDIFOUT_CHSTS1; offset <= SPDIFOUT_CHSTS5; 201 offset += regmap_get_reg_stride(priv->map)) 202 regmap_write(priv->map, offset, 0); 203 204 /* Setup channel status B bits [31 - 0]*/ 205 regmap_write(priv->map, SPDIFOUT_CHSTS6, val); 206 207 /* Clear channel status B bits [191 - 32] */ 208 for (offset = SPDIFOUT_CHSTS7; offset <= SPDIFOUT_CHSTSB; 209 offset += regmap_get_reg_stride(priv->map)) 210 regmap_write(priv->map, offset, 0); 211 212 return 0; 213 } 214 215 static int axg_spdifout_hw_params(struct snd_pcm_substream *substream, 216 struct snd_pcm_hw_params *params, 217 struct snd_soc_dai *dai) 218 { 219 struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai); 220 unsigned int rate = params_rate(params); 221 int ret; 222 223 /* 2 * 32bits per subframe * 2 channels = 128 */ 224 ret = clk_set_rate(priv->mclk, rate * 128); 225 if (ret) { 226 dev_err(dai->dev, "failed to set spdif clock\n"); 227 return ret; 228 } 229 230 ret = axg_spdifout_sample_fmt(params, dai); 231 if (ret) { 232 dev_err(dai->dev, "failed to setup sample format\n"); 233 return ret; 234 } 235 236 ret = axg_spdifout_set_chsts(params, dai); 237 if (ret) { 238 dev_err(dai->dev, "failed to setup channel status words\n"); 239 return ret; 240 } 241 242 return 0; 243 } 244 245 static int axg_spdifout_startup(struct snd_pcm_substream *substream, 246 struct snd_soc_dai *dai) 247 { 248 struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai); 249 int ret; 250 251 /* Clock the spdif output block */ 252 ret = clk_prepare_enable(priv->pclk); 253 if (ret) { 254 dev_err(dai->dev, "failed to enable pclk\n"); 255 return ret; 256 } 257 258 /* Make sure the block is initially stopped */ 259 axg_spdifout_disable(priv->map); 260 261 /* Insert data from bit 27 lsb first */ 262 regmap_update_bits(priv->map, SPDIFOUT_CTRL0, 263 SPDIFOUT_CTRL0_MSB_FIRST | SPDIFOUT_CTRL0_DATA_SEL, 264 0); 265 266 /* Manual control of V, C and U, U = 0 */ 267 regmap_update_bits(priv->map, SPDIFOUT_CTRL0, 268 SPDIFOUT_CTRL0_CHSTS_SEL | SPDIFOUT_CTRL0_VSEL | 269 SPDIFOUT_CTRL0_USEL | SPDIFOUT_CTRL0_USET, 270 0); 271 272 /* Static SWAP configuration ATM */ 273 regmap_write(priv->map, SPDIFOUT_SWAP, 0x10); 274 275 return 0; 276 } 277 278 static void axg_spdifout_shutdown(struct snd_pcm_substream *substream, 279 struct snd_soc_dai *dai) 280 { 281 struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai); 282 283 clk_disable_unprepare(priv->pclk); 284 } 285 286 static const struct snd_soc_dai_ops axg_spdifout_ops = { 287 .trigger = axg_spdifout_trigger, 288 .digital_mute = axg_spdifout_digital_mute, 289 .hw_params = axg_spdifout_hw_params, 290 .startup = axg_spdifout_startup, 291 .shutdown = axg_spdifout_shutdown, 292 }; 293 294 static struct snd_soc_dai_driver axg_spdifout_dai_drv[] = { 295 { 296 .name = "SPDIF Output", 297 .playback = { 298 .stream_name = "Playback", 299 .channels_min = 1, 300 .channels_max = 2, 301 .rates = (SNDRV_PCM_RATE_32000 | 302 SNDRV_PCM_RATE_44100 | 303 SNDRV_PCM_RATE_48000 | 304 SNDRV_PCM_RATE_88200 | 305 SNDRV_PCM_RATE_96000 | 306 SNDRV_PCM_RATE_176400 | 307 SNDRV_PCM_RATE_192000), 308 .formats = (SNDRV_PCM_FMTBIT_S8 | 309 SNDRV_PCM_FMTBIT_S16_LE | 310 SNDRV_PCM_FMTBIT_S20_LE | 311 SNDRV_PCM_FMTBIT_S24_LE), 312 }, 313 .ops = &axg_spdifout_ops, 314 }, 315 }; 316 317 static const char * const spdifout_sel_texts[] = { 318 "IN 0", "IN 1", "IN 2", 319 }; 320 321 static SOC_ENUM_SINGLE_DECL(axg_spdifout_sel_enum, SPDIFOUT_CTRL1, 24, 322 spdifout_sel_texts); 323 324 static const struct snd_kcontrol_new axg_spdifout_in_mux = 325 SOC_DAPM_ENUM("Input Source", axg_spdifout_sel_enum); 326 327 static const struct snd_soc_dapm_widget axg_spdifout_dapm_widgets[] = { 328 SND_SOC_DAPM_AIF_IN("IN 0", NULL, 0, SND_SOC_NOPM, 0, 0), 329 SND_SOC_DAPM_AIF_IN("IN 1", NULL, 0, SND_SOC_NOPM, 0, 0), 330 SND_SOC_DAPM_AIF_IN("IN 2", NULL, 0, SND_SOC_NOPM, 0, 0), 331 SND_SOC_DAPM_MUX("SRC SEL", SND_SOC_NOPM, 0, 0, &axg_spdifout_in_mux), 332 }; 333 334 static const struct snd_soc_dapm_route axg_spdifout_dapm_routes[] = { 335 { "SRC SEL", "IN 0", "IN 0" }, 336 { "SRC SEL", "IN 1", "IN 1" }, 337 { "SRC SEL", "IN 2", "IN 2" }, 338 { "Playback", NULL, "SRC SEL" }, 339 }; 340 341 static const struct snd_kcontrol_new axg_spdifout_controls[] = { 342 SOC_DOUBLE("Playback Volume", SPDIFOUT_GAIN0, 0, 8, 255, 0), 343 SOC_DOUBLE("Playback Switch", SPDIFOUT_CTRL0, 22, 21, 1, 1), 344 SOC_SINGLE("Playback Gain Enable Switch", 345 SPDIFOUT_CTRL1, 26, 1, 0), 346 SOC_SINGLE("Playback Channels Mix Switch", 347 SPDIFOUT_CTRL0, 23, 1, 0), 348 }; 349 350 static int axg_spdifout_set_bias_level(struct snd_soc_component *component, 351 enum snd_soc_bias_level level) 352 { 353 struct axg_spdifout *priv = snd_soc_component_get_drvdata(component); 354 enum snd_soc_bias_level now = 355 snd_soc_component_get_bias_level(component); 356 int ret = 0; 357 358 switch (level) { 359 case SND_SOC_BIAS_PREPARE: 360 if (now == SND_SOC_BIAS_STANDBY) 361 ret = clk_prepare_enable(priv->mclk); 362 break; 363 364 case SND_SOC_BIAS_STANDBY: 365 if (now == SND_SOC_BIAS_PREPARE) 366 clk_disable_unprepare(priv->mclk); 367 break; 368 369 case SND_SOC_BIAS_OFF: 370 case SND_SOC_BIAS_ON: 371 break; 372 } 373 374 return ret; 375 } 376 377 static const struct snd_soc_component_driver axg_spdifout_component_drv = { 378 .controls = axg_spdifout_controls, 379 .num_controls = ARRAY_SIZE(axg_spdifout_controls), 380 .dapm_widgets = axg_spdifout_dapm_widgets, 381 .num_dapm_widgets = ARRAY_SIZE(axg_spdifout_dapm_widgets), 382 .dapm_routes = axg_spdifout_dapm_routes, 383 .num_dapm_routes = ARRAY_SIZE(axg_spdifout_dapm_routes), 384 .set_bias_level = axg_spdifout_set_bias_level, 385 }; 386 387 static const struct regmap_config axg_spdifout_regmap_cfg = { 388 .reg_bits = 32, 389 .val_bits = 32, 390 .reg_stride = 4, 391 .max_register = SPDIFOUT_MUTE_VAL, 392 }; 393 394 static const struct of_device_id axg_spdifout_of_match[] = { 395 { .compatible = "amlogic,axg-spdifout", }, 396 {} 397 }; 398 MODULE_DEVICE_TABLE(of, axg_spdifout_of_match); 399 400 static int axg_spdifout_probe(struct platform_device *pdev) 401 { 402 struct device *dev = &pdev->dev; 403 struct axg_spdifout *priv; 404 struct resource *res; 405 void __iomem *regs; 406 int ret; 407 408 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 409 if (!priv) 410 return -ENOMEM; 411 platform_set_drvdata(pdev, priv); 412 413 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 414 regs = devm_ioremap_resource(dev, res); 415 if (IS_ERR(regs)) 416 return PTR_ERR(regs); 417 418 priv->map = devm_regmap_init_mmio(dev, regs, &axg_spdifout_regmap_cfg); 419 if (IS_ERR(priv->map)) { 420 dev_err(dev, "failed to init regmap: %ld\n", 421 PTR_ERR(priv->map)); 422 return PTR_ERR(priv->map); 423 } 424 425 priv->pclk = devm_clk_get(dev, "pclk"); 426 if (IS_ERR(priv->pclk)) { 427 ret = PTR_ERR(priv->pclk); 428 if (ret != -EPROBE_DEFER) 429 dev_err(dev, "failed to get pclk: %d\n", ret); 430 return ret; 431 } 432 433 priv->mclk = devm_clk_get(dev, "mclk"); 434 if (IS_ERR(priv->mclk)) { 435 ret = PTR_ERR(priv->mclk); 436 if (ret != -EPROBE_DEFER) 437 dev_err(dev, "failed to get mclk: %d\n", ret); 438 return ret; 439 } 440 441 return devm_snd_soc_register_component(dev, &axg_spdifout_component_drv, 442 axg_spdifout_dai_drv, ARRAY_SIZE(axg_spdifout_dai_drv)); 443 } 444 445 static struct platform_driver axg_spdifout_pdrv = { 446 .probe = axg_spdifout_probe, 447 .driver = { 448 .name = "axg-spdifout", 449 .of_match_table = axg_spdifout_of_match, 450 }, 451 }; 452 module_platform_driver(axg_spdifout_pdrv); 453 454 MODULE_DESCRIPTION("Amlogic AXG SPDIF Output driver"); 455 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); 456 MODULE_LICENSE("GPL v2"); 457