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