1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Driver for Microchip S/PDIF TX Controller 4 // 5 // Copyright (C) 2020 Microchip Technology Inc. and its subsidiaries 6 // 7 // Author: Codrin Ciubotariu <codrin.ciubotariu@microchip.com> 8 9 #include <linux/bitfield.h> 10 #include <linux/clk.h> 11 #include <linux/io.h> 12 #include <linux/module.h> 13 #include <linux/pm_runtime.h> 14 #include <linux/spinlock.h> 15 16 #include <sound/asoundef.h> 17 #include <sound/dmaengine_pcm.h> 18 #include <sound/pcm_params.h> 19 #include <sound/soc.h> 20 21 /* 22 * ---- S/PDIF Transmitter Controller Register map ---- 23 */ 24 #define SPDIFTX_CR 0x00 /* Control Register */ 25 #define SPDIFTX_MR 0x04 /* Mode Register */ 26 #define SPDIFTX_CDR 0x0C /* Common Data Register */ 27 28 #define SPDIFTX_IER 0x14 /* Interrupt Enable Register */ 29 #define SPDIFTX_IDR 0x18 /* Interrupt Disable Register */ 30 #define SPDIFTX_IMR 0x1C /* Interrupt Mask Register */ 31 #define SPDIFTX_ISR 0x20 /* Interrupt Status Register */ 32 33 #define SPDIFTX_CH1UD(reg) (0x50 + (reg) * 4) /* User Data 1 Register x */ 34 #define SPDIFTX_CH1S(reg) (0x80 + (reg) * 4) /* Channel Status 1 Register x */ 35 36 #define SPDIFTX_VERSION 0xF0 37 38 /* 39 * ---- Control Register (Write-only) ---- 40 */ 41 #define SPDIFTX_CR_SWRST BIT(0) /* Software Reset */ 42 #define SPDIFTX_CR_FCLR BIT(1) /* FIFO clear */ 43 44 /* 45 * ---- Mode Register (Read/Write) ---- 46 */ 47 /* Transmit Enable */ 48 #define SPDIFTX_MR_TXEN_MASK GENMASK(0, 0) 49 #define SPDIFTX_MR_TXEN_DISABLE (0 << 0) 50 #define SPDIFTX_MR_TXEN_ENABLE (1 << 0) 51 52 /* Multichannel Transfer */ 53 #define SPDIFTX_MR_MULTICH_MASK GENAMSK(1, 1) 54 #define SPDIFTX_MR_MULTICH_MONO (0 << 1) 55 #define SPDIFTX_MR_MULTICH_DUAL (1 << 1) 56 57 /* Data Word Endian Mode */ 58 #define SPDIFTX_MR_ENDIAN_MASK GENMASK(2, 2) 59 #define SPDIFTX_MR_ENDIAN_LITTLE (0 << 2) 60 #define SPDIFTX_MR_ENDIAN_BIG (1 << 2) 61 62 /* Data Justification */ 63 #define SPDIFTX_MR_JUSTIFY_MASK GENMASK(3, 3) 64 #define SPDIFTX_MR_JUSTIFY_LSB (0 << 3) 65 #define SPDIFTX_MR_JUSTIFY_MSB (1 << 3) 66 67 /* Common Audio Register Transfer Mode */ 68 #define SPDIFTX_MR_CMODE_MASK GENMASK(5, 4) 69 #define SPDIFTX_MR_CMODE_INDEX_ACCESS (0 << 4) 70 #define SPDIFTX_MR_CMODE_TOGGLE_ACCESS (1 << 4) 71 #define SPDIFTX_MR_CMODE_INTERLVD_ACCESS (2 << 4) 72 73 /* Valid Bits per Sample */ 74 #define SPDIFTX_MR_VBPS_MASK GENMASK(13, 8) 75 76 /* Chunk Size */ 77 #define SPDIFTX_MR_CHUNK_MASK GENMASK(19, 16) 78 79 /* Validity Bits for Channels 1 and 2 */ 80 #define SPDIFTX_MR_VALID1 BIT(24) 81 #define SPDIFTX_MR_VALID2 BIT(25) 82 83 /* Disable Null Frame on underrun */ 84 #define SPDIFTX_MR_DNFR_MASK GENMASK(27, 27) 85 #define SPDIFTX_MR_DNFR_INVALID (0 << 27) 86 #define SPDIFTX_MR_DNFR_VALID (1 << 27) 87 88 /* Bytes per Sample */ 89 #define SPDIFTX_MR_BPS_MASK GENMASK(29, 28) 90 91 /* 92 * ---- Interrupt Enable/Disable/Mask/Status Register (Write/Read-only) ---- 93 */ 94 #define SPDIFTX_IR_TXRDY BIT(0) 95 #define SPDIFTX_IR_TXEMPTY BIT(1) 96 #define SPDIFTX_IR_TXFULL BIT(2) 97 #define SPDIFTX_IR_TXCHUNK BIT(3) 98 #define SPDIFTX_IR_TXUDR BIT(4) 99 #define SPDIFTX_IR_TXOVR BIT(5) 100 #define SPDIFTX_IR_CSRDY BIT(6) 101 #define SPDIFTX_IR_UDRDY BIT(7) 102 #define SPDIFTX_IR_TXRDYCH(ch) BIT((ch) + 8) 103 #define SPDIFTX_IR_SECE BIT(10) 104 #define SPDIFTX_IR_TXUDRCH(ch) BIT((ch) + 11) 105 #define SPDIFTX_IR_BEND BIT(13) 106 107 static bool mchp_spdiftx_readable_reg(struct device *dev, unsigned int reg) 108 { 109 switch (reg) { 110 case SPDIFTX_MR: 111 case SPDIFTX_IMR: 112 case SPDIFTX_ISR: 113 case SPDIFTX_CH1UD(0): 114 case SPDIFTX_CH1UD(1): 115 case SPDIFTX_CH1UD(2): 116 case SPDIFTX_CH1UD(3): 117 case SPDIFTX_CH1UD(4): 118 case SPDIFTX_CH1UD(5): 119 case SPDIFTX_CH1S(0): 120 case SPDIFTX_CH1S(1): 121 case SPDIFTX_CH1S(2): 122 case SPDIFTX_CH1S(3): 123 case SPDIFTX_CH1S(4): 124 case SPDIFTX_CH1S(5): 125 return true; 126 default: 127 return false; 128 } 129 } 130 131 static bool mchp_spdiftx_writeable_reg(struct device *dev, unsigned int reg) 132 { 133 switch (reg) { 134 case SPDIFTX_CR: 135 case SPDIFTX_MR: 136 case SPDIFTX_CDR: 137 case SPDIFTX_IER: 138 case SPDIFTX_IDR: 139 case SPDIFTX_CH1UD(0): 140 case SPDIFTX_CH1UD(1): 141 case SPDIFTX_CH1UD(2): 142 case SPDIFTX_CH1UD(3): 143 case SPDIFTX_CH1UD(4): 144 case SPDIFTX_CH1UD(5): 145 case SPDIFTX_CH1S(0): 146 case SPDIFTX_CH1S(1): 147 case SPDIFTX_CH1S(2): 148 case SPDIFTX_CH1S(3): 149 case SPDIFTX_CH1S(4): 150 case SPDIFTX_CH1S(5): 151 return true; 152 default: 153 return false; 154 } 155 } 156 157 static bool mchp_spdiftx_precious_reg(struct device *dev, unsigned int reg) 158 { 159 switch (reg) { 160 case SPDIFTX_CDR: 161 case SPDIFTX_ISR: 162 return true; 163 default: 164 return false; 165 } 166 } 167 168 static const struct regmap_config mchp_spdiftx_regmap_config = { 169 .reg_bits = 32, 170 .reg_stride = 4, 171 .val_bits = 32, 172 .max_register = SPDIFTX_VERSION, 173 .readable_reg = mchp_spdiftx_readable_reg, 174 .writeable_reg = mchp_spdiftx_writeable_reg, 175 .precious_reg = mchp_spdiftx_precious_reg, 176 .cache_type = REGCACHE_FLAT, 177 }; 178 179 #define SPDIFTX_GCLK_RATIO 128 180 181 #define SPDIFTX_CS_BITS 192 182 #define SPDIFTX_UD_BITS 192 183 184 struct mchp_spdiftx_mixer_control { 185 unsigned char ch_stat[SPDIFTX_CS_BITS / 8]; 186 unsigned char user_data[SPDIFTX_UD_BITS / 8]; 187 spinlock_t lock; /* exclusive access to control data */ 188 }; 189 190 struct mchp_spdiftx_dev { 191 struct mchp_spdiftx_mixer_control control; 192 struct snd_dmaengine_dai_dma_data playback; 193 struct device *dev; 194 struct regmap *regmap; 195 struct clk *pclk; 196 struct clk *gclk; 197 unsigned int fmt; 198 unsigned int suspend_irq; 199 }; 200 201 static inline int mchp_spdiftx_is_running(struct mchp_spdiftx_dev *dev) 202 { 203 u32 mr; 204 205 regmap_read(dev->regmap, SPDIFTX_MR, &mr); 206 return !!(mr & SPDIFTX_MR_TXEN_ENABLE); 207 } 208 209 static void mchp_spdiftx_channel_status_write(struct mchp_spdiftx_dev *dev) 210 { 211 struct mchp_spdiftx_mixer_control *ctrl = &dev->control; 212 u32 val; 213 int i; 214 215 for (i = 0; i < ARRAY_SIZE(ctrl->ch_stat) / 4; i++) { 216 val = (ctrl->ch_stat[(i * 4) + 0] << 0) | 217 (ctrl->ch_stat[(i * 4) + 1] << 8) | 218 (ctrl->ch_stat[(i * 4) + 2] << 16) | 219 (ctrl->ch_stat[(i * 4) + 3] << 24); 220 221 regmap_write(dev->regmap, SPDIFTX_CH1S(i), val); 222 } 223 } 224 225 static void mchp_spdiftx_user_data_write(struct mchp_spdiftx_dev *dev) 226 { 227 struct mchp_spdiftx_mixer_control *ctrl = &dev->control; 228 u32 val; 229 int i; 230 231 for (i = 0; i < ARRAY_SIZE(ctrl->user_data) / 4; i++) { 232 val = (ctrl->user_data[(i * 4) + 0] << 0) | 233 (ctrl->user_data[(i * 4) + 1] << 8) | 234 (ctrl->user_data[(i * 4) + 2] << 16) | 235 (ctrl->user_data[(i * 4) + 3] << 24); 236 237 regmap_write(dev->regmap, SPDIFTX_CH1UD(i), val); 238 } 239 } 240 241 static irqreturn_t mchp_spdiftx_interrupt(int irq, void *dev_id) 242 { 243 struct mchp_spdiftx_dev *dev = dev_id; 244 struct mchp_spdiftx_mixer_control *ctrl = &dev->control; 245 u32 sr, imr, pending, idr = 0; 246 247 regmap_read(dev->regmap, SPDIFTX_ISR, &sr); 248 regmap_read(dev->regmap, SPDIFTX_IMR, &imr); 249 pending = sr & imr; 250 251 if (!pending) 252 return IRQ_NONE; 253 254 if (pending & SPDIFTX_IR_TXUDR) { 255 dev_warn(dev->dev, "underflow detected\n"); 256 idr |= SPDIFTX_IR_TXUDR; 257 } 258 259 if (pending & SPDIFTX_IR_TXOVR) { 260 dev_warn(dev->dev, "overflow detected\n"); 261 idr |= SPDIFTX_IR_TXOVR; 262 } 263 264 if (pending & SPDIFTX_IR_UDRDY) { 265 spin_lock(&ctrl->lock); 266 mchp_spdiftx_user_data_write(dev); 267 spin_unlock(&ctrl->lock); 268 idr |= SPDIFTX_IR_UDRDY; 269 } 270 271 if (pending & SPDIFTX_IR_CSRDY) { 272 spin_lock(&ctrl->lock); 273 mchp_spdiftx_channel_status_write(dev); 274 spin_unlock(&ctrl->lock); 275 idr |= SPDIFTX_IR_CSRDY; 276 } 277 278 regmap_write(dev->regmap, SPDIFTX_IDR, idr); 279 280 return IRQ_HANDLED; 281 } 282 283 static int mchp_spdiftx_dai_startup(struct snd_pcm_substream *substream, 284 struct snd_soc_dai *dai) 285 { 286 struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai); 287 288 /* Software reset the IP */ 289 regmap_write(dev->regmap, SPDIFTX_CR, 290 SPDIFTX_CR_SWRST | SPDIFTX_CR_FCLR); 291 292 return 0; 293 } 294 295 static void mchp_spdiftx_dai_shutdown(struct snd_pcm_substream *substream, 296 struct snd_soc_dai *dai) 297 { 298 struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai); 299 300 /* Disable interrupts */ 301 regmap_write(dev->regmap, SPDIFTX_IDR, 0xffffffff); 302 } 303 304 static int mchp_spdiftx_trigger(struct snd_pcm_substream *substream, int cmd, 305 struct snd_soc_dai *dai) 306 { 307 struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai); 308 struct mchp_spdiftx_mixer_control *ctrl = &dev->control; 309 int ret; 310 311 /* do not start/stop while channel status or user data is updated */ 312 spin_lock(&ctrl->lock); 313 switch (cmd) { 314 case SNDRV_PCM_TRIGGER_RESUME: 315 case SNDRV_PCM_TRIGGER_START: 316 regmap_write(dev->regmap, SPDIFTX_IER, dev->suspend_irq | 317 SPDIFTX_IR_TXUDR | SPDIFTX_IR_TXOVR); 318 dev->suspend_irq = 0; 319 fallthrough; 320 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 321 ret = regmap_update_bits(dev->regmap, SPDIFTX_MR, SPDIFTX_MR_TXEN_MASK, 322 SPDIFTX_MR_TXEN_ENABLE); 323 break; 324 case SNDRV_PCM_TRIGGER_SUSPEND: 325 regmap_read(dev->regmap, SPDIFTX_IMR, &dev->suspend_irq); 326 fallthrough; 327 case SNDRV_PCM_TRIGGER_STOP: 328 regmap_write(dev->regmap, SPDIFTX_IDR, dev->suspend_irq | 329 SPDIFTX_IR_TXUDR | SPDIFTX_IR_TXOVR); 330 fallthrough; 331 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 332 ret = regmap_update_bits(dev->regmap, SPDIFTX_MR, SPDIFTX_MR_TXEN_MASK, 333 SPDIFTX_MR_TXEN_DISABLE); 334 break; 335 default: 336 ret = -EINVAL; 337 } 338 spin_unlock(&ctrl->lock); 339 if (ret) 340 dev_err(dev->dev, "unable to start/stop TX: %d\n", ret); 341 342 return ret; 343 } 344 345 static int mchp_spdiftx_hw_params(struct snd_pcm_substream *substream, 346 struct snd_pcm_hw_params *params, 347 struct snd_soc_dai *dai) 348 { 349 unsigned long flags; 350 struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai); 351 struct mchp_spdiftx_mixer_control *ctrl = &dev->control; 352 u32 mr; 353 unsigned int bps = params_physical_width(params) / 8; 354 unsigned char aes3; 355 int ret; 356 357 dev_dbg(dev->dev, "%s() rate=%u format=%#x width=%u channels=%u\n", 358 __func__, params_rate(params), params_format(params), 359 params_width(params), params_channels(params)); 360 361 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 362 dev_err(dev->dev, "Capture is not supported\n"); 363 return -EINVAL; 364 } 365 366 regmap_read(dev->regmap, SPDIFTX_MR, &mr); 367 368 if (mr & SPDIFTX_MR_TXEN_ENABLE) { 369 dev_err(dev->dev, "PCM already running\n"); 370 return -EBUSY; 371 } 372 373 /* Defaults: Toggle mode, justify to LSB, chunksize 1 */ 374 mr = SPDIFTX_MR_CMODE_TOGGLE_ACCESS | SPDIFTX_MR_JUSTIFY_LSB; 375 dev->playback.maxburst = 1; 376 switch (params_channels(params)) { 377 case 1: 378 mr |= SPDIFTX_MR_MULTICH_MONO; 379 break; 380 case 2: 381 mr |= SPDIFTX_MR_MULTICH_DUAL; 382 if (bps > 2) 383 dev->playback.maxburst = 2; 384 break; 385 default: 386 dev_err(dev->dev, "unsupported number of channels: %d\n", 387 params_channels(params)); 388 return -EINVAL; 389 } 390 mr |= FIELD_PREP(SPDIFTX_MR_CHUNK_MASK, dev->playback.maxburst); 391 392 switch (params_format(params)) { 393 case SNDRV_PCM_FORMAT_S8: 394 mr |= FIELD_PREP(SPDIFTX_MR_VBPS_MASK, 8); 395 break; 396 case SNDRV_PCM_FORMAT_S16_BE: 397 mr |= SPDIFTX_MR_ENDIAN_BIG; 398 fallthrough; 399 case SNDRV_PCM_FORMAT_S16_LE: 400 mr |= FIELD_PREP(SPDIFTX_MR_VBPS_MASK, 16); 401 break; 402 case SNDRV_PCM_FORMAT_S18_3BE: 403 mr |= SPDIFTX_MR_ENDIAN_BIG; 404 fallthrough; 405 case SNDRV_PCM_FORMAT_S18_3LE: 406 mr |= FIELD_PREP(SPDIFTX_MR_VBPS_MASK, 18); 407 break; 408 case SNDRV_PCM_FORMAT_S20_3BE: 409 mr |= SPDIFTX_MR_ENDIAN_BIG; 410 fallthrough; 411 case SNDRV_PCM_FORMAT_S20_3LE: 412 mr |= FIELD_PREP(SPDIFTX_MR_VBPS_MASK, 20); 413 break; 414 case SNDRV_PCM_FORMAT_S24_3BE: 415 mr |= SPDIFTX_MR_ENDIAN_BIG; 416 fallthrough; 417 case SNDRV_PCM_FORMAT_S24_3LE: 418 mr |= FIELD_PREP(SPDIFTX_MR_VBPS_MASK, 24); 419 break; 420 case SNDRV_PCM_FORMAT_S24_BE: 421 mr |= SPDIFTX_MR_ENDIAN_BIG; 422 fallthrough; 423 case SNDRV_PCM_FORMAT_S24_LE: 424 mr |= FIELD_PREP(SPDIFTX_MR_VBPS_MASK, 24); 425 break; 426 case SNDRV_PCM_FORMAT_S32_BE: 427 mr |= SPDIFTX_MR_ENDIAN_BIG; 428 fallthrough; 429 case SNDRV_PCM_FORMAT_S32_LE: 430 mr |= FIELD_PREP(SPDIFTX_MR_VBPS_MASK, 32); 431 break; 432 default: 433 dev_err(dev->dev, "unsupported PCM format: %d\n", 434 params_format(params)); 435 return -EINVAL; 436 } 437 438 mr |= FIELD_PREP(SPDIFTX_MR_BPS_MASK, bps - 1); 439 440 switch (params_rate(params)) { 441 case 22050: 442 aes3 = IEC958_AES3_CON_FS_22050; 443 break; 444 case 24000: 445 aes3 = IEC958_AES3_CON_FS_24000; 446 break; 447 case 32000: 448 aes3 = IEC958_AES3_CON_FS_32000; 449 break; 450 case 44100: 451 aes3 = IEC958_AES3_CON_FS_44100; 452 break; 453 case 48000: 454 aes3 = IEC958_AES3_CON_FS_48000; 455 break; 456 case 88200: 457 aes3 = IEC958_AES3_CON_FS_88200; 458 break; 459 case 96000: 460 aes3 = IEC958_AES3_CON_FS_96000; 461 break; 462 case 176400: 463 aes3 = IEC958_AES3_CON_FS_176400; 464 break; 465 case 192000: 466 aes3 = IEC958_AES3_CON_FS_192000; 467 break; 468 case 8000: 469 case 11025: 470 case 16000: 471 case 64000: 472 aes3 = IEC958_AES3_CON_FS_NOTID; 473 break; 474 default: 475 dev_err(dev->dev, "unsupported sample frequency: %u\n", 476 params_rate(params)); 477 return -EINVAL; 478 } 479 spin_lock_irqsave(&ctrl->lock, flags); 480 ctrl->ch_stat[3] &= ~IEC958_AES3_CON_FS; 481 ctrl->ch_stat[3] |= aes3; 482 mchp_spdiftx_channel_status_write(dev); 483 spin_unlock_irqrestore(&ctrl->lock, flags); 484 485 /* GCLK is enabled by runtime PM. */ 486 clk_disable_unprepare(dev->gclk); 487 488 ret = clk_set_rate(dev->gclk, params_rate(params) * 489 SPDIFTX_GCLK_RATIO); 490 if (ret) { 491 dev_err(dev->dev, 492 "unable to change gclk rate to: rate %u * ratio %u\n", 493 params_rate(params), SPDIFTX_GCLK_RATIO); 494 return ret; 495 } 496 ret = clk_prepare_enable(dev->gclk); 497 if (ret) { 498 dev_err(dev->dev, "unable to enable gclk: %d\n", ret); 499 return ret; 500 } 501 502 dev_dbg(dev->dev, "%s(): GCLK set to %d\n", __func__, 503 params_rate(params) * SPDIFTX_GCLK_RATIO); 504 505 regmap_write(dev->regmap, SPDIFTX_MR, mr); 506 507 return 0; 508 } 509 510 static int mchp_spdiftx_hw_free(struct snd_pcm_substream *substream, 511 struct snd_soc_dai *dai) 512 { 513 struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai); 514 515 return regmap_write(dev->regmap, SPDIFTX_CR, 516 SPDIFTX_CR_SWRST | SPDIFTX_CR_FCLR); 517 } 518 519 #define MCHP_SPDIFTX_RATES SNDRV_PCM_RATE_8000_192000 520 521 #define MCHP_SPDIFTX_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ 522 SNDRV_PCM_FMTBIT_S16_LE | \ 523 SNDRV_PCM_FMTBIT_U16_BE | \ 524 SNDRV_PCM_FMTBIT_S18_3LE | \ 525 SNDRV_PCM_FMTBIT_S18_3BE | \ 526 SNDRV_PCM_FMTBIT_S20_3LE | \ 527 SNDRV_PCM_FMTBIT_S20_3BE | \ 528 SNDRV_PCM_FMTBIT_S24_3LE | \ 529 SNDRV_PCM_FMTBIT_S24_3BE | \ 530 SNDRV_PCM_FMTBIT_S24_LE | \ 531 SNDRV_PCM_FMTBIT_S24_BE | \ 532 SNDRV_PCM_FMTBIT_S32_LE | \ 533 SNDRV_PCM_FMTBIT_S32_BE \ 534 ) 535 536 static int mchp_spdiftx_info(struct snd_kcontrol *kcontrol, 537 struct snd_ctl_elem_info *uinfo) 538 { 539 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; 540 uinfo->count = 1; 541 542 return 0; 543 } 544 545 static int mchp_spdiftx_cs_get(struct snd_kcontrol *kcontrol, 546 struct snd_ctl_elem_value *uvalue) 547 { 548 unsigned long flags; 549 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol); 550 struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai); 551 struct mchp_spdiftx_mixer_control *ctrl = &dev->control; 552 553 spin_lock_irqsave(&ctrl->lock, flags); 554 memcpy(uvalue->value.iec958.status, ctrl->ch_stat, 555 sizeof(ctrl->ch_stat)); 556 spin_unlock_irqrestore(&ctrl->lock, flags); 557 558 return 0; 559 } 560 561 static int mchp_spdiftx_cs_put(struct snd_kcontrol *kcontrol, 562 struct snd_ctl_elem_value *uvalue) 563 { 564 unsigned long flags; 565 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol); 566 struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai); 567 struct mchp_spdiftx_mixer_control *ctrl = &dev->control; 568 int changed = 0; 569 int i; 570 571 spin_lock_irqsave(&ctrl->lock, flags); 572 for (i = 0; i < ARRAY_SIZE(ctrl->ch_stat); i++) { 573 if (ctrl->ch_stat[i] != uvalue->value.iec958.status[i]) 574 changed = 1; 575 ctrl->ch_stat[i] = uvalue->value.iec958.status[i]; 576 } 577 578 if (changed) { 579 /* don't enable IP while we copy the channel status */ 580 if (mchp_spdiftx_is_running(dev)) { 581 /* 582 * if SPDIF is running, wait for interrupt to write 583 * channel status 584 */ 585 regmap_write(dev->regmap, SPDIFTX_IER, 586 SPDIFTX_IR_CSRDY); 587 } else { 588 mchp_spdiftx_channel_status_write(dev); 589 } 590 } 591 spin_unlock_irqrestore(&ctrl->lock, flags); 592 593 return changed; 594 } 595 596 static int mchp_spdiftx_cs_mask(struct snd_kcontrol *kcontrol, 597 struct snd_ctl_elem_value *uvalue) 598 { 599 memset(uvalue->value.iec958.status, 0xff, 600 sizeof(uvalue->value.iec958.status)); 601 602 return 0; 603 } 604 605 static int mchp_spdiftx_subcode_get(struct snd_kcontrol *kcontrol, 606 struct snd_ctl_elem_value *uvalue) 607 { 608 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol); 609 struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai); 610 struct mchp_spdiftx_mixer_control *ctrl = &dev->control; 611 unsigned long flags; 612 613 spin_lock_irqsave(&ctrl->lock, flags); 614 memcpy(uvalue->value.iec958.subcode, ctrl->user_data, 615 sizeof(ctrl->user_data)); 616 spin_unlock_irqrestore(&ctrl->lock, flags); 617 618 return 0; 619 } 620 621 static int mchp_spdiftx_subcode_put(struct snd_kcontrol *kcontrol, 622 struct snd_ctl_elem_value *uvalue) 623 { 624 unsigned long flags; 625 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol); 626 struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai); 627 struct mchp_spdiftx_mixer_control *ctrl = &dev->control; 628 int changed = 0; 629 int i; 630 631 spin_lock_irqsave(&ctrl->lock, flags); 632 for (i = 0; i < ARRAY_SIZE(ctrl->user_data); i++) { 633 if (ctrl->user_data[i] != uvalue->value.iec958.subcode[i]) 634 changed = 1; 635 636 ctrl->user_data[i] = uvalue->value.iec958.subcode[i]; 637 } 638 if (changed) { 639 if (mchp_spdiftx_is_running(dev)) { 640 /* 641 * if SPDIF is running, wait for interrupt to write 642 * user data 643 */ 644 regmap_write(dev->regmap, SPDIFTX_IER, 645 SPDIFTX_IR_UDRDY); 646 } else { 647 mchp_spdiftx_user_data_write(dev); 648 } 649 } 650 spin_unlock_irqrestore(&ctrl->lock, flags); 651 652 return changed; 653 } 654 655 static struct snd_kcontrol_new mchp_spdiftx_ctrls[] = { 656 /* Channel status controller */ 657 { 658 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 659 .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT), 660 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | 661 SNDRV_CTL_ELEM_ACCESS_VOLATILE, 662 .info = mchp_spdiftx_info, 663 .get = mchp_spdiftx_cs_get, 664 .put = mchp_spdiftx_cs_put, 665 }, 666 { 667 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 668 .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK), 669 .access = SNDRV_CTL_ELEM_ACCESS_READ, 670 SNDRV_CTL_ELEM_ACCESS_VOLATILE, 671 .info = mchp_spdiftx_info, 672 .get = mchp_spdiftx_cs_mask, 673 }, 674 /* User bits controller */ 675 { 676 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 677 .name = "IEC958 Subcode Playback Default", 678 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE, 679 .info = mchp_spdiftx_info, 680 .get = mchp_spdiftx_subcode_get, 681 .put = mchp_spdiftx_subcode_put, 682 }, 683 }; 684 685 static int mchp_spdiftx_dai_probe(struct snd_soc_dai *dai) 686 { 687 struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai); 688 689 snd_soc_dai_init_dma_data(dai, &dev->playback, NULL); 690 691 /* Add controls */ 692 snd_soc_add_dai_controls(dai, mchp_spdiftx_ctrls, 693 ARRAY_SIZE(mchp_spdiftx_ctrls)); 694 695 return 0; 696 } 697 698 static const struct snd_soc_dai_ops mchp_spdiftx_dai_ops = { 699 .probe = mchp_spdiftx_dai_probe, 700 .startup = mchp_spdiftx_dai_startup, 701 .shutdown = mchp_spdiftx_dai_shutdown, 702 .trigger = mchp_spdiftx_trigger, 703 .hw_params = mchp_spdiftx_hw_params, 704 .hw_free = mchp_spdiftx_hw_free, 705 }; 706 707 static struct snd_soc_dai_driver mchp_spdiftx_dai = { 708 .name = "mchp-spdiftx", 709 .playback = { 710 .stream_name = "S/PDIF Playback", 711 .channels_min = 1, 712 .channels_max = 2, 713 .rates = MCHP_SPDIFTX_RATES, 714 .formats = MCHP_SPDIFTX_FORMATS, 715 }, 716 .ops = &mchp_spdiftx_dai_ops, 717 }; 718 719 static const struct snd_soc_component_driver mchp_spdiftx_component = { 720 .name = "mchp-spdiftx", 721 .legacy_dai_naming = 1, 722 }; 723 724 static const struct of_device_id mchp_spdiftx_dt_ids[] = { 725 { 726 .compatible = "microchip,sama7g5-spdiftx", 727 }, 728 { /* sentinel */ } 729 }; 730 MODULE_DEVICE_TABLE(of, mchp_spdiftx_dt_ids); 731 732 static int mchp_spdiftx_runtime_suspend(struct device *dev) 733 { 734 struct mchp_spdiftx_dev *spdiftx = dev_get_drvdata(dev); 735 736 regcache_cache_only(spdiftx->regmap, true); 737 738 clk_disable_unprepare(spdiftx->gclk); 739 clk_disable_unprepare(spdiftx->pclk); 740 741 return 0; 742 } 743 744 static int mchp_spdiftx_runtime_resume(struct device *dev) 745 { 746 struct mchp_spdiftx_dev *spdiftx = dev_get_drvdata(dev); 747 int ret; 748 749 ret = clk_prepare_enable(spdiftx->pclk); 750 if (ret) { 751 dev_err(spdiftx->dev, 752 "failed to enable the peripheral clock: %d\n", ret); 753 return ret; 754 } 755 ret = clk_prepare_enable(spdiftx->gclk); 756 if (ret) { 757 dev_err(spdiftx->dev, 758 "failed to enable generic clock: %d\n", ret); 759 goto disable_pclk; 760 } 761 762 regcache_cache_only(spdiftx->regmap, false); 763 regcache_mark_dirty(spdiftx->regmap); 764 ret = regcache_sync(spdiftx->regmap); 765 if (ret) { 766 regcache_cache_only(spdiftx->regmap, true); 767 clk_disable_unprepare(spdiftx->gclk); 768 disable_pclk: 769 clk_disable_unprepare(spdiftx->pclk); 770 } 771 772 return ret; 773 } 774 775 static const struct dev_pm_ops mchp_spdiftx_pm_ops = { 776 SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume) 777 RUNTIME_PM_OPS(mchp_spdiftx_runtime_suspend, mchp_spdiftx_runtime_resume, 778 NULL) 779 }; 780 781 static int mchp_spdiftx_probe(struct platform_device *pdev) 782 { 783 struct mchp_spdiftx_dev *dev; 784 struct resource *mem; 785 struct regmap *regmap; 786 void __iomem *base; 787 struct mchp_spdiftx_mixer_control *ctrl; 788 int irq; 789 int err; 790 791 /* Get memory for driver data. */ 792 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 793 if (!dev) 794 return -ENOMEM; 795 796 /* Map I/O registers. */ 797 base = devm_platform_get_and_ioremap_resource(pdev, 0, &mem); 798 if (IS_ERR(base)) 799 return PTR_ERR(base); 800 801 regmap = devm_regmap_init_mmio(&pdev->dev, base, 802 &mchp_spdiftx_regmap_config); 803 if (IS_ERR(regmap)) 804 return PTR_ERR(regmap); 805 806 /* Request IRQ */ 807 irq = platform_get_irq(pdev, 0); 808 if (irq < 0) 809 return irq; 810 811 err = devm_request_irq(&pdev->dev, irq, mchp_spdiftx_interrupt, 0, 812 dev_name(&pdev->dev), dev); 813 if (err) 814 return err; 815 816 /* Get the peripheral clock */ 817 dev->pclk = devm_clk_get(&pdev->dev, "pclk"); 818 if (IS_ERR(dev->pclk)) { 819 err = PTR_ERR(dev->pclk); 820 dev_err(&pdev->dev, 821 "failed to get the peripheral clock: %d\n", err); 822 return err; 823 } 824 825 /* Get the generic clock */ 826 dev->gclk = devm_clk_get(&pdev->dev, "gclk"); 827 if (IS_ERR(dev->gclk)) { 828 err = PTR_ERR(dev->gclk); 829 dev_err(&pdev->dev, 830 "failed to get the PMC generic clock: %d\n", err); 831 return err; 832 } 833 834 ctrl = &dev->control; 835 spin_lock_init(&ctrl->lock); 836 837 /* Init channel status */ 838 ctrl->ch_stat[0] = IEC958_AES0_CON_NOT_COPYRIGHT | 839 IEC958_AES0_CON_EMPHASIS_NONE; 840 841 dev->dev = &pdev->dev; 842 dev->regmap = regmap; 843 platform_set_drvdata(pdev, dev); 844 845 pm_runtime_enable(dev->dev); 846 if (!pm_runtime_enabled(dev->dev)) { 847 err = mchp_spdiftx_runtime_resume(dev->dev); 848 if (err) 849 return err; 850 } 851 852 dev->playback.addr = (dma_addr_t)mem->start + SPDIFTX_CDR; 853 dev->playback.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 854 855 err = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); 856 if (err) { 857 dev_err(&pdev->dev, "failed to register PMC: %d\n", err); 858 goto pm_runtime_suspend; 859 } 860 861 err = devm_snd_soc_register_component(&pdev->dev, 862 &mchp_spdiftx_component, 863 &mchp_spdiftx_dai, 1); 864 if (err) { 865 dev_err(&pdev->dev, "failed to register component: %d\n", err); 866 goto pm_runtime_suspend; 867 } 868 869 return 0; 870 871 pm_runtime_suspend: 872 if (!pm_runtime_status_suspended(dev->dev)) 873 mchp_spdiftx_runtime_suspend(dev->dev); 874 pm_runtime_disable(dev->dev); 875 876 return err; 877 } 878 879 static void mchp_spdiftx_remove(struct platform_device *pdev) 880 { 881 struct mchp_spdiftx_dev *dev = platform_get_drvdata(pdev); 882 883 if (!pm_runtime_status_suspended(dev->dev)) 884 mchp_spdiftx_runtime_suspend(dev->dev); 885 886 pm_runtime_disable(dev->dev); 887 } 888 889 static struct platform_driver mchp_spdiftx_driver = { 890 .probe = mchp_spdiftx_probe, 891 .remove_new = mchp_spdiftx_remove, 892 .driver = { 893 .name = "mchp_spdiftx", 894 .of_match_table = mchp_spdiftx_dt_ids, 895 .pm = pm_ptr(&mchp_spdiftx_pm_ops) 896 }, 897 }; 898 899 module_platform_driver(mchp_spdiftx_driver); 900 901 MODULE_AUTHOR("Codrin Ciubotariu <codrin.ciubotariu@microchip.com>"); 902 MODULE_DESCRIPTION("Microchip S/PDIF TX Controller Driver"); 903 MODULE_LICENSE("GPL v2"); 904