1 /* 2 * Driver for Atmel AC97C 3 * 4 * Copyright (C) 2005-2009 Atmel Corporation 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published by 8 * the Free Software Foundation. 9 */ 10 #include <linux/clk.h> 11 #include <linux/delay.h> 12 #include <linux/bitmap.h> 13 #include <linux/device.h> 14 #include <linux/atmel_pdc.h> 15 #include <linux/gpio/consumer.h> 16 #include <linux/init.h> 17 #include <linux/interrupt.h> 18 #include <linux/module.h> 19 #include <linux/platform_device.h> 20 #include <linux/mutex.h> 21 #include <linux/types.h> 22 #include <linux/io.h> 23 #include <linux/of.h> 24 #include <linux/of_device.h> 25 26 #include <sound/core.h> 27 #include <sound/initval.h> 28 #include <sound/pcm.h> 29 #include <sound/pcm_params.h> 30 #include <sound/ac97_codec.h> 31 #include <sound/memalloc.h> 32 33 #include "ac97c.h" 34 35 /* Serialize access to opened variable */ 36 static DEFINE_MUTEX(opened_mutex); 37 38 struct atmel_ac97c { 39 struct clk *pclk; 40 struct platform_device *pdev; 41 42 struct snd_pcm_substream *playback_substream; 43 struct snd_pcm_substream *capture_substream; 44 struct snd_card *card; 45 struct snd_pcm *pcm; 46 struct snd_ac97 *ac97; 47 struct snd_ac97_bus *ac97_bus; 48 49 u64 cur_format; 50 unsigned int cur_rate; 51 int playback_period, capture_period; 52 /* Serialize access to opened variable */ 53 spinlock_t lock; 54 void __iomem *regs; 55 int irq; 56 int opened; 57 struct gpio_desc *reset_pin; 58 }; 59 60 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data) 61 62 #define ac97c_writel(chip, reg, val) \ 63 __raw_writel((val), (chip)->regs + AC97C_##reg) 64 #define ac97c_readl(chip, reg) \ 65 __raw_readl((chip)->regs + AC97C_##reg) 66 67 static const struct snd_pcm_hardware atmel_ac97c_hw = { 68 .info = (SNDRV_PCM_INFO_MMAP 69 | SNDRV_PCM_INFO_MMAP_VALID 70 | SNDRV_PCM_INFO_INTERLEAVED 71 | SNDRV_PCM_INFO_BLOCK_TRANSFER 72 | SNDRV_PCM_INFO_JOINT_DUPLEX 73 | SNDRV_PCM_INFO_RESUME 74 | SNDRV_PCM_INFO_PAUSE), 75 .formats = (SNDRV_PCM_FMTBIT_S16_BE 76 | SNDRV_PCM_FMTBIT_S16_LE), 77 .rates = (SNDRV_PCM_RATE_CONTINUOUS), 78 .rate_min = 4000, 79 .rate_max = 48000, 80 .channels_min = 1, 81 .channels_max = 2, 82 .buffer_bytes_max = 2 * 2 * 64 * 2048, 83 .period_bytes_min = 4096, 84 .period_bytes_max = 4096, 85 .periods_min = 6, 86 .periods_max = 64, 87 }; 88 89 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) 90 { 91 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 92 struct snd_pcm_runtime *runtime = substream->runtime; 93 94 mutex_lock(&opened_mutex); 95 chip->opened++; 96 runtime->hw = atmel_ac97c_hw; 97 if (chip->cur_rate) { 98 runtime->hw.rate_min = chip->cur_rate; 99 runtime->hw.rate_max = chip->cur_rate; 100 } 101 if (chip->cur_format) 102 runtime->hw.formats = pcm_format_to_bits(chip->cur_format); 103 mutex_unlock(&opened_mutex); 104 chip->playback_substream = substream; 105 return 0; 106 } 107 108 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) 109 { 110 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 111 struct snd_pcm_runtime *runtime = substream->runtime; 112 113 mutex_lock(&opened_mutex); 114 chip->opened++; 115 runtime->hw = atmel_ac97c_hw; 116 if (chip->cur_rate) { 117 runtime->hw.rate_min = chip->cur_rate; 118 runtime->hw.rate_max = chip->cur_rate; 119 } 120 if (chip->cur_format) 121 runtime->hw.formats = pcm_format_to_bits(chip->cur_format); 122 mutex_unlock(&opened_mutex); 123 chip->capture_substream = substream; 124 return 0; 125 } 126 127 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) 128 { 129 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 130 131 mutex_lock(&opened_mutex); 132 chip->opened--; 133 if (!chip->opened) { 134 chip->cur_rate = 0; 135 chip->cur_format = 0; 136 } 137 mutex_unlock(&opened_mutex); 138 139 chip->playback_substream = NULL; 140 141 return 0; 142 } 143 144 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) 145 { 146 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 147 148 mutex_lock(&opened_mutex); 149 chip->opened--; 150 if (!chip->opened) { 151 chip->cur_rate = 0; 152 chip->cur_format = 0; 153 } 154 mutex_unlock(&opened_mutex); 155 156 chip->capture_substream = NULL; 157 158 return 0; 159 } 160 161 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, 162 struct snd_pcm_hw_params *hw_params) 163 { 164 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 165 int retval; 166 167 retval = snd_pcm_lib_malloc_pages(substream, 168 params_buffer_bytes(hw_params)); 169 if (retval < 0) 170 return retval; 171 172 /* Set restrictions to params. */ 173 mutex_lock(&opened_mutex); 174 chip->cur_rate = params_rate(hw_params); 175 chip->cur_format = params_format(hw_params); 176 mutex_unlock(&opened_mutex); 177 178 return retval; 179 } 180 181 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, 182 struct snd_pcm_hw_params *hw_params) 183 { 184 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 185 int retval; 186 187 retval = snd_pcm_lib_malloc_pages(substream, 188 params_buffer_bytes(hw_params)); 189 if (retval < 0) 190 return retval; 191 192 /* Set restrictions to params. */ 193 mutex_lock(&opened_mutex); 194 chip->cur_rate = params_rate(hw_params); 195 chip->cur_format = params_format(hw_params); 196 mutex_unlock(&opened_mutex); 197 198 return retval; 199 } 200 201 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) 202 { 203 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 204 struct snd_pcm_runtime *runtime = substream->runtime; 205 int block_size = frames_to_bytes(runtime, runtime->period_size); 206 unsigned long word = ac97c_readl(chip, OCA); 207 int retval; 208 209 chip->playback_period = 0; 210 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 211 212 /* assign channels to AC97C channel A */ 213 switch (runtime->channels) { 214 case 1: 215 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 216 break; 217 case 2: 218 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 219 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 220 break; 221 default: 222 /* TODO: support more than two channels */ 223 return -EINVAL; 224 } 225 ac97c_writel(chip, OCA, word); 226 227 /* configure sample format and size */ 228 word = ac97c_readl(chip, CAMR); 229 if (chip->opened <= 1) 230 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 231 else 232 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 233 234 switch (runtime->format) { 235 case SNDRV_PCM_FORMAT_S16_LE: 236 break; 237 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 238 word &= ~(AC97C_CMR_CEM_LITTLE); 239 break; 240 default: 241 word = ac97c_readl(chip, OCA); 242 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 243 ac97c_writel(chip, OCA, word); 244 return -EINVAL; 245 } 246 247 /* Enable underrun interrupt on channel A */ 248 word |= AC97C_CSR_UNRUN; 249 250 ac97c_writel(chip, CAMR, word); 251 252 /* Enable channel A event interrupt */ 253 word = ac97c_readl(chip, IMR); 254 word |= AC97C_SR_CAEVT; 255 ac97c_writel(chip, IER, word); 256 257 /* set variable rate if needed */ 258 if (runtime->rate != 48000) { 259 word = ac97c_readl(chip, MR); 260 word |= AC97C_MR_VRA; 261 ac97c_writel(chip, MR, word); 262 } else { 263 word = ac97c_readl(chip, MR); 264 word &= ~(AC97C_MR_VRA); 265 ac97c_writel(chip, MR, word); 266 } 267 268 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, 269 runtime->rate); 270 if (retval) 271 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 272 runtime->rate); 273 274 /* Initialize and start the PDC */ 275 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR); 276 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR); 277 writel(runtime->dma_addr + block_size, chip->regs + ATMEL_PDC_TNPR); 278 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR); 279 280 return retval; 281 } 282 283 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) 284 { 285 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 286 struct snd_pcm_runtime *runtime = substream->runtime; 287 int block_size = frames_to_bytes(runtime, runtime->period_size); 288 unsigned long word = ac97c_readl(chip, ICA); 289 int retval; 290 291 chip->capture_period = 0; 292 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 293 294 /* assign channels to AC97C channel A */ 295 switch (runtime->channels) { 296 case 1: 297 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 298 break; 299 case 2: 300 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 301 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 302 break; 303 default: 304 /* TODO: support more than two channels */ 305 return -EINVAL; 306 } 307 ac97c_writel(chip, ICA, word); 308 309 /* configure sample format and size */ 310 word = ac97c_readl(chip, CAMR); 311 if (chip->opened <= 1) 312 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 313 else 314 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 315 316 switch (runtime->format) { 317 case SNDRV_PCM_FORMAT_S16_LE: 318 break; 319 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 320 word &= ~(AC97C_CMR_CEM_LITTLE); 321 break; 322 default: 323 word = ac97c_readl(chip, ICA); 324 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 325 ac97c_writel(chip, ICA, word); 326 return -EINVAL; 327 } 328 329 /* Enable overrun interrupt on channel A */ 330 word |= AC97C_CSR_OVRUN; 331 332 ac97c_writel(chip, CAMR, word); 333 334 /* Enable channel A event interrupt */ 335 word = ac97c_readl(chip, IMR); 336 word |= AC97C_SR_CAEVT; 337 ac97c_writel(chip, IER, word); 338 339 /* set variable rate if needed */ 340 if (runtime->rate != 48000) { 341 word = ac97c_readl(chip, MR); 342 word |= AC97C_MR_VRA; 343 ac97c_writel(chip, MR, word); 344 } else { 345 word = ac97c_readl(chip, MR); 346 word &= ~(AC97C_MR_VRA); 347 ac97c_writel(chip, MR, word); 348 } 349 350 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, 351 runtime->rate); 352 if (retval) 353 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 354 runtime->rate); 355 356 /* Initialize and start the PDC */ 357 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR); 358 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR); 359 writel(runtime->dma_addr + block_size, chip->regs + ATMEL_PDC_RNPR); 360 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR); 361 362 return retval; 363 } 364 365 static int 366 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) 367 { 368 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 369 unsigned long camr, ptcr = 0; 370 371 camr = ac97c_readl(chip, CAMR); 372 373 switch (cmd) { 374 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 375 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 376 case SNDRV_PCM_TRIGGER_START: 377 ptcr = ATMEL_PDC_TXTEN; 378 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX; 379 break; 380 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 381 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 382 case SNDRV_PCM_TRIGGER_STOP: 383 ptcr |= ATMEL_PDC_TXTDIS; 384 if (chip->opened <= 1) 385 camr &= ~AC97C_CMR_CENA; 386 break; 387 default: 388 return -EINVAL; 389 } 390 391 ac97c_writel(chip, CAMR, camr); 392 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 393 return 0; 394 } 395 396 static int 397 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) 398 { 399 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 400 unsigned long camr, ptcr = 0; 401 402 camr = ac97c_readl(chip, CAMR); 403 ptcr = readl(chip->regs + ATMEL_PDC_PTSR); 404 405 switch (cmd) { 406 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 407 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 408 case SNDRV_PCM_TRIGGER_START: 409 ptcr = ATMEL_PDC_RXTEN; 410 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX; 411 break; 412 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 413 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 414 case SNDRV_PCM_TRIGGER_STOP: 415 ptcr |= ATMEL_PDC_RXTDIS; 416 if (chip->opened <= 1) 417 camr &= ~AC97C_CMR_CENA; 418 break; 419 default: 420 return -EINVAL; 421 } 422 423 ac97c_writel(chip, CAMR, camr); 424 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 425 return 0; 426 } 427 428 static snd_pcm_uframes_t 429 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) 430 { 431 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 432 struct snd_pcm_runtime *runtime = substream->runtime; 433 snd_pcm_uframes_t frames; 434 unsigned long bytes; 435 436 bytes = readl(chip->regs + ATMEL_PDC_TPR); 437 bytes -= runtime->dma_addr; 438 439 frames = bytes_to_frames(runtime, bytes); 440 if (frames >= runtime->buffer_size) 441 frames -= runtime->buffer_size; 442 return frames; 443 } 444 445 static snd_pcm_uframes_t 446 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) 447 { 448 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 449 struct snd_pcm_runtime *runtime = substream->runtime; 450 snd_pcm_uframes_t frames; 451 unsigned long bytes; 452 453 bytes = readl(chip->regs + ATMEL_PDC_RPR); 454 bytes -= runtime->dma_addr; 455 456 frames = bytes_to_frames(runtime, bytes); 457 if (frames >= runtime->buffer_size) 458 frames -= runtime->buffer_size; 459 return frames; 460 } 461 462 static const struct snd_pcm_ops atmel_ac97_playback_ops = { 463 .open = atmel_ac97c_playback_open, 464 .close = atmel_ac97c_playback_close, 465 .ioctl = snd_pcm_lib_ioctl, 466 .hw_params = atmel_ac97c_playback_hw_params, 467 .hw_free = snd_pcm_lib_free_pages, 468 .prepare = atmel_ac97c_playback_prepare, 469 .trigger = atmel_ac97c_playback_trigger, 470 .pointer = atmel_ac97c_playback_pointer, 471 }; 472 473 static const struct snd_pcm_ops atmel_ac97_capture_ops = { 474 .open = atmel_ac97c_capture_open, 475 .close = atmel_ac97c_capture_close, 476 .ioctl = snd_pcm_lib_ioctl, 477 .hw_params = atmel_ac97c_capture_hw_params, 478 .hw_free = snd_pcm_lib_free_pages, 479 .prepare = atmel_ac97c_capture_prepare, 480 .trigger = atmel_ac97c_capture_trigger, 481 .pointer = atmel_ac97c_capture_pointer, 482 }; 483 484 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) 485 { 486 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev; 487 irqreturn_t retval = IRQ_NONE; 488 u32 sr = ac97c_readl(chip, SR); 489 u32 casr = ac97c_readl(chip, CASR); 490 u32 cosr = ac97c_readl(chip, COSR); 491 u32 camr = ac97c_readl(chip, CAMR); 492 493 if (sr & AC97C_SR_CAEVT) { 494 struct snd_pcm_runtime *runtime; 495 int offset, next_period, block_size; 496 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n", 497 casr & AC97C_CSR_OVRUN ? " OVRUN" : "", 498 casr & AC97C_CSR_RXRDY ? " RXRDY" : "", 499 casr & AC97C_CSR_UNRUN ? " UNRUN" : "", 500 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 501 casr & AC97C_CSR_TXRDY ? " TXRDY" : "", 502 !casr ? " NONE" : ""); 503 if ((casr & camr) & AC97C_CSR_ENDTX) { 504 runtime = chip->playback_substream->runtime; 505 block_size = frames_to_bytes(runtime, runtime->period_size); 506 chip->playback_period++; 507 508 if (chip->playback_period == runtime->periods) 509 chip->playback_period = 0; 510 next_period = chip->playback_period + 1; 511 if (next_period == runtime->periods) 512 next_period = 0; 513 514 offset = block_size * next_period; 515 516 writel(runtime->dma_addr + offset, chip->regs + ATMEL_PDC_TNPR); 517 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR); 518 519 snd_pcm_period_elapsed(chip->playback_substream); 520 } 521 if ((casr & camr) & AC97C_CSR_ENDRX) { 522 runtime = chip->capture_substream->runtime; 523 block_size = frames_to_bytes(runtime, runtime->period_size); 524 chip->capture_period++; 525 526 if (chip->capture_period == runtime->periods) 527 chip->capture_period = 0; 528 next_period = chip->capture_period + 1; 529 if (next_period == runtime->periods) 530 next_period = 0; 531 532 offset = block_size * next_period; 533 534 writel(runtime->dma_addr + offset, chip->regs + ATMEL_PDC_RNPR); 535 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR); 536 snd_pcm_period_elapsed(chip->capture_substream); 537 } 538 retval = IRQ_HANDLED; 539 } 540 541 if (sr & AC97C_SR_COEVT) { 542 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n", 543 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "", 544 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "", 545 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 546 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "", 547 !cosr ? " NONE" : ""); 548 retval = IRQ_HANDLED; 549 } 550 551 if (retval == IRQ_NONE) { 552 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x " 553 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr); 554 } 555 556 return retval; 557 } 558 559 static const struct ac97_pcm at91_ac97_pcm_defs[] = { 560 /* Playback */ 561 { 562 .exclusive = 1, 563 .r = { { 564 .slots = ((1 << AC97_SLOT_PCM_LEFT) 565 | (1 << AC97_SLOT_PCM_RIGHT)), 566 } }, 567 }, 568 /* PCM in */ 569 { 570 .stream = 1, 571 .exclusive = 1, 572 .r = { { 573 .slots = ((1 << AC97_SLOT_PCM_LEFT) 574 | (1 << AC97_SLOT_PCM_RIGHT)), 575 } } 576 }, 577 /* Mic in */ 578 { 579 .stream = 1, 580 .exclusive = 1, 581 .r = { { 582 .slots = (1<<AC97_SLOT_MIC), 583 } } 584 }, 585 }; 586 587 static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip) 588 { 589 struct snd_pcm *pcm; 590 struct snd_pcm_hardware hw = atmel_ac97c_hw; 591 int retval; 592 593 retval = snd_ac97_pcm_assign(chip->ac97_bus, 594 ARRAY_SIZE(at91_ac97_pcm_defs), 595 at91_ac97_pcm_defs); 596 if (retval) 597 return retval; 598 599 retval = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm); 600 if (retval) 601 return retval; 602 603 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &atmel_ac97_capture_ops); 604 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &atmel_ac97_playback_ops); 605 606 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, 607 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min, 608 hw.buffer_bytes_max); 609 610 pcm->private_data = chip; 611 pcm->info_flags = 0; 612 strcpy(pcm->name, chip->card->shortname); 613 chip->pcm = pcm; 614 615 return 0; 616 } 617 618 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip) 619 { 620 struct snd_ac97_template template; 621 memset(&template, 0, sizeof(template)); 622 template.private_data = chip; 623 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97); 624 } 625 626 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg, 627 unsigned short val) 628 { 629 struct atmel_ac97c *chip = get_chip(ac97); 630 unsigned long word; 631 int timeout = 40; 632 633 word = (reg & 0x7f) << 16 | val; 634 635 do { 636 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) { 637 ac97c_writel(chip, COTHR, word); 638 return; 639 } 640 udelay(1); 641 } while (--timeout); 642 643 dev_dbg(&chip->pdev->dev, "codec write timeout\n"); 644 } 645 646 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97, 647 unsigned short reg) 648 { 649 struct atmel_ac97c *chip = get_chip(ac97); 650 unsigned long word; 651 int timeout = 40; 652 int write = 10; 653 654 word = (0x80 | (reg & 0x7f)) << 16; 655 656 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) 657 ac97c_readl(chip, CORHR); 658 659 retry_write: 660 timeout = 40; 661 662 do { 663 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) { 664 ac97c_writel(chip, COTHR, word); 665 goto read_reg; 666 } 667 udelay(10); 668 } while (--timeout); 669 670 if (!--write) 671 goto timed_out; 672 goto retry_write; 673 674 read_reg: 675 do { 676 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) { 677 unsigned short val = ac97c_readl(chip, CORHR); 678 return val; 679 } 680 udelay(10); 681 } while (--timeout); 682 683 if (!--write) 684 goto timed_out; 685 goto retry_write; 686 687 timed_out: 688 dev_dbg(&chip->pdev->dev, "codec read timeout\n"); 689 return 0xffff; 690 } 691 692 static void atmel_ac97c_reset(struct atmel_ac97c *chip) 693 { 694 ac97c_writel(chip, MR, 0); 695 ac97c_writel(chip, MR, AC97C_MR_ENA); 696 ac97c_writel(chip, CAMR, 0); 697 ac97c_writel(chip, COMR, 0); 698 699 if (!IS_ERR(chip->reset_pin)) { 700 gpiod_set_value(chip->reset_pin, 0); 701 /* AC97 v2.2 specifications says minimum 1 us. */ 702 udelay(2); 703 gpiod_set_value(chip->reset_pin, 1); 704 } else { 705 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA); 706 udelay(2); 707 ac97c_writel(chip, MR, AC97C_MR_ENA); 708 } 709 } 710 711 static const struct of_device_id atmel_ac97c_dt_ids[] = { 712 { .compatible = "atmel,at91sam9263-ac97c", }, 713 { } 714 }; 715 MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids); 716 717 static int atmel_ac97c_probe(struct platform_device *pdev) 718 { 719 struct device *dev = &pdev->dev; 720 struct snd_card *card; 721 struct atmel_ac97c *chip; 722 struct resource *regs; 723 struct clk *pclk; 724 static struct snd_ac97_bus_ops ops = { 725 .write = atmel_ac97c_write, 726 .read = atmel_ac97c_read, 727 }; 728 int retval; 729 int irq; 730 731 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 732 if (!regs) { 733 dev_dbg(&pdev->dev, "no memory resource\n"); 734 return -ENXIO; 735 } 736 737 irq = platform_get_irq(pdev, 0); 738 if (irq < 0) { 739 dev_dbg(&pdev->dev, "could not get irq: %d\n", irq); 740 return irq; 741 } 742 743 pclk = clk_get(&pdev->dev, "ac97_clk"); 744 if (IS_ERR(pclk)) { 745 dev_dbg(&pdev->dev, "no peripheral clock\n"); 746 return PTR_ERR(pclk); 747 } 748 retval = clk_prepare_enable(pclk); 749 if (retval) 750 goto err_prepare_enable; 751 752 retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, 753 SNDRV_DEFAULT_STR1, THIS_MODULE, 754 sizeof(struct atmel_ac97c), &card); 755 if (retval) { 756 dev_dbg(&pdev->dev, "could not create sound card device\n"); 757 goto err_snd_card_new; 758 } 759 760 chip = get_chip(card); 761 762 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip); 763 if (retval) { 764 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq); 765 goto err_request_irq; 766 } 767 chip->irq = irq; 768 769 spin_lock_init(&chip->lock); 770 771 strcpy(card->driver, "Atmel AC97C"); 772 strcpy(card->shortname, "Atmel AC97C"); 773 sprintf(card->longname, "Atmel AC97 controller"); 774 775 chip->card = card; 776 chip->pclk = pclk; 777 chip->pdev = pdev; 778 chip->regs = ioremap(regs->start, resource_size(regs)); 779 780 if (!chip->regs) { 781 dev_dbg(&pdev->dev, "could not remap register memory\n"); 782 retval = -ENOMEM; 783 goto err_ioremap; 784 } 785 786 chip->reset_pin = devm_gpiod_get_index(dev, "ac97", 2, GPIOD_OUT_HIGH); 787 if (IS_ERR(chip->reset_pin)) 788 dev_dbg(dev, "reset pin not available\n"); 789 790 atmel_ac97c_reset(chip); 791 792 /* Enable overrun interrupt from codec channel */ 793 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN); 794 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT); 795 796 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus); 797 if (retval) { 798 dev_dbg(&pdev->dev, "could not register on ac97 bus\n"); 799 goto err_ac97_bus; 800 } 801 802 retval = atmel_ac97c_mixer_new(chip); 803 if (retval) { 804 dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); 805 goto err_ac97_bus; 806 } 807 808 retval = atmel_ac97c_pcm_new(chip); 809 if (retval) { 810 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n"); 811 goto err_ac97_bus; 812 } 813 814 retval = snd_card_register(card); 815 if (retval) { 816 dev_dbg(&pdev->dev, "could not register sound card\n"); 817 goto err_ac97_bus; 818 } 819 820 platform_set_drvdata(pdev, card); 821 822 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n", 823 chip->regs, irq); 824 825 return 0; 826 827 err_ac97_bus: 828 iounmap(chip->regs); 829 err_ioremap: 830 free_irq(irq, chip); 831 err_request_irq: 832 snd_card_free(card); 833 err_snd_card_new: 834 clk_disable_unprepare(pclk); 835 err_prepare_enable: 836 clk_put(pclk); 837 return retval; 838 } 839 840 #ifdef CONFIG_PM_SLEEP 841 static int atmel_ac97c_suspend(struct device *pdev) 842 { 843 struct snd_card *card = dev_get_drvdata(pdev); 844 struct atmel_ac97c *chip = card->private_data; 845 846 clk_disable_unprepare(chip->pclk); 847 return 0; 848 } 849 850 static int atmel_ac97c_resume(struct device *pdev) 851 { 852 struct snd_card *card = dev_get_drvdata(pdev); 853 struct atmel_ac97c *chip = card->private_data; 854 int ret = clk_prepare_enable(chip->pclk); 855 856 return ret; 857 } 858 859 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume); 860 #define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm 861 #else 862 #define ATMEL_AC97C_PM_OPS NULL 863 #endif 864 865 static int atmel_ac97c_remove(struct platform_device *pdev) 866 { 867 struct snd_card *card = platform_get_drvdata(pdev); 868 struct atmel_ac97c *chip = get_chip(card); 869 870 ac97c_writel(chip, CAMR, 0); 871 ac97c_writel(chip, COMR, 0); 872 ac97c_writel(chip, MR, 0); 873 874 clk_disable_unprepare(chip->pclk); 875 clk_put(chip->pclk); 876 iounmap(chip->regs); 877 free_irq(chip->irq, chip); 878 879 snd_card_free(card); 880 881 return 0; 882 } 883 884 static struct platform_driver atmel_ac97c_driver = { 885 .probe = atmel_ac97c_probe, 886 .remove = atmel_ac97c_remove, 887 .driver = { 888 .name = "atmel_ac97c", 889 .pm = ATMEL_AC97C_PM_OPS, 890 .of_match_table = atmel_ac97c_dt_ids, 891 }, 892 }; 893 module_platform_driver(atmel_ac97c_driver); 894 895 MODULE_LICENSE("GPL"); 896 MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); 897 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); 898