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/dmaengine.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/atmel_pdc.h> 17 #include <linux/init.h> 18 #include <linux/interrupt.h> 19 #include <linux/module.h> 20 #include <linux/platform_device.h> 21 #include <linux/mutex.h> 22 #include <linux/gpio.h> 23 #include <linux/types.h> 24 #include <linux/io.h> 25 #include <linux/of.h> 26 #include <linux/of_gpio.h> 27 #include <linux/of_device.h> 28 29 #include <sound/core.h> 30 #include <sound/initval.h> 31 #include <sound/pcm.h> 32 #include <sound/pcm_params.h> 33 #include <sound/ac97_codec.h> 34 #include <sound/atmel-ac97c.h> 35 #include <sound/memalloc.h> 36 37 #include <linux/platform_data/dma-dw.h> 38 #include <linux/dma/dw.h> 39 40 #ifdef CONFIG_AVR32 41 #include <mach/cpu.h> 42 #else 43 #define cpu_is_at32ap7000() 0 44 #endif 45 46 #include "ac97c.h" 47 48 enum { 49 DMA_TX_READY = 0, 50 DMA_RX_READY, 51 DMA_TX_CHAN_PRESENT, 52 DMA_RX_CHAN_PRESENT, 53 }; 54 55 /* Serialize access to opened variable */ 56 static DEFINE_MUTEX(opened_mutex); 57 58 struct atmel_ac97c_dma { 59 struct dma_chan *rx_chan; 60 struct dma_chan *tx_chan; 61 }; 62 63 struct atmel_ac97c { 64 struct clk *pclk; 65 struct platform_device *pdev; 66 struct atmel_ac97c_dma dma; 67 68 struct snd_pcm_substream *playback_substream; 69 struct snd_pcm_substream *capture_substream; 70 struct snd_card *card; 71 struct snd_pcm *pcm; 72 struct snd_ac97 *ac97; 73 struct snd_ac97_bus *ac97_bus; 74 75 u64 cur_format; 76 unsigned int cur_rate; 77 unsigned long flags; 78 int playback_period, capture_period; 79 /* Serialize access to opened variable */ 80 spinlock_t lock; 81 void __iomem *regs; 82 int irq; 83 int opened; 84 int reset_pin; 85 }; 86 87 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data) 88 89 #define ac97c_writel(chip, reg, val) \ 90 __raw_writel((val), (chip)->regs + AC97C_##reg) 91 #define ac97c_readl(chip, reg) \ 92 __raw_readl((chip)->regs + AC97C_##reg) 93 94 /* This function is called by the DMA driver. */ 95 static void atmel_ac97c_dma_playback_period_done(void *arg) 96 { 97 struct atmel_ac97c *chip = arg; 98 snd_pcm_period_elapsed(chip->playback_substream); 99 } 100 101 static void atmel_ac97c_dma_capture_period_done(void *arg) 102 { 103 struct atmel_ac97c *chip = arg; 104 snd_pcm_period_elapsed(chip->capture_substream); 105 } 106 107 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip, 108 struct snd_pcm_substream *substream, 109 enum dma_transfer_direction direction) 110 { 111 struct dma_chan *chan; 112 struct dw_cyclic_desc *cdesc; 113 struct snd_pcm_runtime *runtime = substream->runtime; 114 unsigned long buffer_len, period_len; 115 116 /* 117 * We don't do DMA on "complex" transfers, i.e. with 118 * non-halfword-aligned buffers or lengths. 119 */ 120 if (runtime->dma_addr & 1 || runtime->buffer_size & 1) { 121 dev_dbg(&chip->pdev->dev, "too complex transfer\n"); 122 return -EINVAL; 123 } 124 125 if (direction == DMA_MEM_TO_DEV) 126 chan = chip->dma.tx_chan; 127 else 128 chan = chip->dma.rx_chan; 129 130 buffer_len = frames_to_bytes(runtime, runtime->buffer_size); 131 period_len = frames_to_bytes(runtime, runtime->period_size); 132 133 cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len, 134 period_len, direction); 135 if (IS_ERR(cdesc)) { 136 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n"); 137 return PTR_ERR(cdesc); 138 } 139 140 if (direction == DMA_MEM_TO_DEV) { 141 cdesc->period_callback = atmel_ac97c_dma_playback_period_done; 142 set_bit(DMA_TX_READY, &chip->flags); 143 } else { 144 cdesc->period_callback = atmel_ac97c_dma_capture_period_done; 145 set_bit(DMA_RX_READY, &chip->flags); 146 } 147 148 cdesc->period_callback_param = chip; 149 150 return 0; 151 } 152 153 static struct snd_pcm_hardware atmel_ac97c_hw = { 154 .info = (SNDRV_PCM_INFO_MMAP 155 | SNDRV_PCM_INFO_MMAP_VALID 156 | SNDRV_PCM_INFO_INTERLEAVED 157 | SNDRV_PCM_INFO_BLOCK_TRANSFER 158 | SNDRV_PCM_INFO_JOINT_DUPLEX 159 | SNDRV_PCM_INFO_RESUME 160 | SNDRV_PCM_INFO_PAUSE), 161 .formats = (SNDRV_PCM_FMTBIT_S16_BE 162 | SNDRV_PCM_FMTBIT_S16_LE), 163 .rates = (SNDRV_PCM_RATE_CONTINUOUS), 164 .rate_min = 4000, 165 .rate_max = 48000, 166 .channels_min = 1, 167 .channels_max = 2, 168 .buffer_bytes_max = 2 * 2 * 64 * 2048, 169 .period_bytes_min = 4096, 170 .period_bytes_max = 4096, 171 .periods_min = 6, 172 .periods_max = 64, 173 }; 174 175 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) 176 { 177 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 178 struct snd_pcm_runtime *runtime = substream->runtime; 179 180 mutex_lock(&opened_mutex); 181 chip->opened++; 182 runtime->hw = atmel_ac97c_hw; 183 if (chip->cur_rate) { 184 runtime->hw.rate_min = chip->cur_rate; 185 runtime->hw.rate_max = chip->cur_rate; 186 } 187 if (chip->cur_format) 188 runtime->hw.formats = pcm_format_to_bits(chip->cur_format); 189 mutex_unlock(&opened_mutex); 190 chip->playback_substream = substream; 191 return 0; 192 } 193 194 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) 195 { 196 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 197 struct snd_pcm_runtime *runtime = substream->runtime; 198 199 mutex_lock(&opened_mutex); 200 chip->opened++; 201 runtime->hw = atmel_ac97c_hw; 202 if (chip->cur_rate) { 203 runtime->hw.rate_min = chip->cur_rate; 204 runtime->hw.rate_max = chip->cur_rate; 205 } 206 if (chip->cur_format) 207 runtime->hw.formats = pcm_format_to_bits(chip->cur_format); 208 mutex_unlock(&opened_mutex); 209 chip->capture_substream = substream; 210 return 0; 211 } 212 213 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) 214 { 215 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 216 217 mutex_lock(&opened_mutex); 218 chip->opened--; 219 if (!chip->opened) { 220 chip->cur_rate = 0; 221 chip->cur_format = 0; 222 } 223 mutex_unlock(&opened_mutex); 224 225 chip->playback_substream = NULL; 226 227 return 0; 228 } 229 230 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) 231 { 232 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 233 234 mutex_lock(&opened_mutex); 235 chip->opened--; 236 if (!chip->opened) { 237 chip->cur_rate = 0; 238 chip->cur_format = 0; 239 } 240 mutex_unlock(&opened_mutex); 241 242 chip->capture_substream = NULL; 243 244 return 0; 245 } 246 247 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, 248 struct snd_pcm_hw_params *hw_params) 249 { 250 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 251 int retval; 252 253 retval = snd_pcm_lib_malloc_pages(substream, 254 params_buffer_bytes(hw_params)); 255 if (retval < 0) 256 return retval; 257 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 258 if (cpu_is_at32ap7000()) { 259 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 260 if (retval == 1) 261 if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) 262 dw_dma_cyclic_free(chip->dma.tx_chan); 263 } 264 /* Set restrictions to params. */ 265 mutex_lock(&opened_mutex); 266 chip->cur_rate = params_rate(hw_params); 267 chip->cur_format = params_format(hw_params); 268 mutex_unlock(&opened_mutex); 269 270 return retval; 271 } 272 273 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, 274 struct snd_pcm_hw_params *hw_params) 275 { 276 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 277 int retval; 278 279 retval = snd_pcm_lib_malloc_pages(substream, 280 params_buffer_bytes(hw_params)); 281 if (retval < 0) 282 return retval; 283 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 284 if (cpu_is_at32ap7000() && retval == 1) 285 if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) 286 dw_dma_cyclic_free(chip->dma.rx_chan); 287 288 /* Set restrictions to params. */ 289 mutex_lock(&opened_mutex); 290 chip->cur_rate = params_rate(hw_params); 291 chip->cur_format = params_format(hw_params); 292 mutex_unlock(&opened_mutex); 293 294 return retval; 295 } 296 297 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream) 298 { 299 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 300 if (cpu_is_at32ap7000()) { 301 if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) 302 dw_dma_cyclic_free(chip->dma.tx_chan); 303 } 304 return snd_pcm_lib_free_pages(substream); 305 } 306 307 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream) 308 { 309 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 310 if (cpu_is_at32ap7000()) { 311 if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) 312 dw_dma_cyclic_free(chip->dma.rx_chan); 313 } 314 return snd_pcm_lib_free_pages(substream); 315 } 316 317 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) 318 { 319 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 320 struct snd_pcm_runtime *runtime = substream->runtime; 321 int block_size = frames_to_bytes(runtime, runtime->period_size); 322 unsigned long word = ac97c_readl(chip, OCA); 323 int retval; 324 325 chip->playback_period = 0; 326 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 327 328 /* assign channels to AC97C channel A */ 329 switch (runtime->channels) { 330 case 1: 331 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 332 break; 333 case 2: 334 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 335 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 336 break; 337 default: 338 /* TODO: support more than two channels */ 339 return -EINVAL; 340 } 341 ac97c_writel(chip, OCA, word); 342 343 /* configure sample format and size */ 344 word = ac97c_readl(chip, CAMR); 345 if (chip->opened <= 1) 346 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 347 else 348 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 349 350 switch (runtime->format) { 351 case SNDRV_PCM_FORMAT_S16_LE: 352 if (cpu_is_at32ap7000()) 353 word |= AC97C_CMR_CEM_LITTLE; 354 break; 355 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 356 word &= ~(AC97C_CMR_CEM_LITTLE); 357 break; 358 default: 359 word = ac97c_readl(chip, OCA); 360 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 361 ac97c_writel(chip, OCA, word); 362 return -EINVAL; 363 } 364 365 /* Enable underrun interrupt on channel A */ 366 word |= AC97C_CSR_UNRUN; 367 368 ac97c_writel(chip, CAMR, word); 369 370 /* Enable channel A event interrupt */ 371 word = ac97c_readl(chip, IMR); 372 word |= AC97C_SR_CAEVT; 373 ac97c_writel(chip, IER, word); 374 375 /* set variable rate if needed */ 376 if (runtime->rate != 48000) { 377 word = ac97c_readl(chip, MR); 378 word |= AC97C_MR_VRA; 379 ac97c_writel(chip, MR, word); 380 } else { 381 word = ac97c_readl(chip, MR); 382 word &= ~(AC97C_MR_VRA); 383 ac97c_writel(chip, MR, word); 384 } 385 386 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, 387 runtime->rate); 388 if (retval) 389 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 390 runtime->rate); 391 392 if (cpu_is_at32ap7000()) { 393 if (!test_bit(DMA_TX_READY, &chip->flags)) 394 retval = atmel_ac97c_prepare_dma(chip, substream, 395 DMA_MEM_TO_DEV); 396 } else { 397 /* Initialize and start the PDC */ 398 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR); 399 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR); 400 writel(runtime->dma_addr + block_size, 401 chip->regs + ATMEL_PDC_TNPR); 402 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR); 403 } 404 405 return retval; 406 } 407 408 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) 409 { 410 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 411 struct snd_pcm_runtime *runtime = substream->runtime; 412 int block_size = frames_to_bytes(runtime, runtime->period_size); 413 unsigned long word = ac97c_readl(chip, ICA); 414 int retval; 415 416 chip->capture_period = 0; 417 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 418 419 /* assign channels to AC97C channel A */ 420 switch (runtime->channels) { 421 case 1: 422 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 423 break; 424 case 2: 425 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 426 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 427 break; 428 default: 429 /* TODO: support more than two channels */ 430 return -EINVAL; 431 } 432 ac97c_writel(chip, ICA, word); 433 434 /* configure sample format and size */ 435 word = ac97c_readl(chip, CAMR); 436 if (chip->opened <= 1) 437 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 438 else 439 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 440 441 switch (runtime->format) { 442 case SNDRV_PCM_FORMAT_S16_LE: 443 if (cpu_is_at32ap7000()) 444 word |= AC97C_CMR_CEM_LITTLE; 445 break; 446 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 447 word &= ~(AC97C_CMR_CEM_LITTLE); 448 break; 449 default: 450 word = ac97c_readl(chip, ICA); 451 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 452 ac97c_writel(chip, ICA, word); 453 return -EINVAL; 454 } 455 456 /* Enable overrun interrupt on channel A */ 457 word |= AC97C_CSR_OVRUN; 458 459 ac97c_writel(chip, CAMR, word); 460 461 /* Enable channel A event interrupt */ 462 word = ac97c_readl(chip, IMR); 463 word |= AC97C_SR_CAEVT; 464 ac97c_writel(chip, IER, word); 465 466 /* set variable rate if needed */ 467 if (runtime->rate != 48000) { 468 word = ac97c_readl(chip, MR); 469 word |= AC97C_MR_VRA; 470 ac97c_writel(chip, MR, word); 471 } else { 472 word = ac97c_readl(chip, MR); 473 word &= ~(AC97C_MR_VRA); 474 ac97c_writel(chip, MR, word); 475 } 476 477 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, 478 runtime->rate); 479 if (retval) 480 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 481 runtime->rate); 482 483 if (cpu_is_at32ap7000()) { 484 if (!test_bit(DMA_RX_READY, &chip->flags)) 485 retval = atmel_ac97c_prepare_dma(chip, substream, 486 DMA_DEV_TO_MEM); 487 } else { 488 /* Initialize and start the PDC */ 489 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR); 490 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR); 491 writel(runtime->dma_addr + block_size, 492 chip->regs + ATMEL_PDC_RNPR); 493 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR); 494 } 495 496 return retval; 497 } 498 499 static int 500 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) 501 { 502 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 503 unsigned long camr, ptcr = 0; 504 int retval = 0; 505 506 camr = ac97c_readl(chip, CAMR); 507 508 switch (cmd) { 509 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 510 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 511 case SNDRV_PCM_TRIGGER_START: 512 if (cpu_is_at32ap7000()) { 513 retval = dw_dma_cyclic_start(chip->dma.tx_chan); 514 if (retval) 515 goto out; 516 } else { 517 ptcr = ATMEL_PDC_TXTEN; 518 } 519 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX; 520 break; 521 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 522 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 523 case SNDRV_PCM_TRIGGER_STOP: 524 if (cpu_is_at32ap7000()) 525 dw_dma_cyclic_stop(chip->dma.tx_chan); 526 else 527 ptcr |= ATMEL_PDC_TXTDIS; 528 if (chip->opened <= 1) 529 camr &= ~AC97C_CMR_CENA; 530 break; 531 default: 532 retval = -EINVAL; 533 goto out; 534 } 535 536 ac97c_writel(chip, CAMR, camr); 537 if (!cpu_is_at32ap7000()) 538 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 539 out: 540 return retval; 541 } 542 543 static int 544 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) 545 { 546 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 547 unsigned long camr, ptcr = 0; 548 int retval = 0; 549 550 camr = ac97c_readl(chip, CAMR); 551 ptcr = readl(chip->regs + ATMEL_PDC_PTSR); 552 553 switch (cmd) { 554 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 555 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 556 case SNDRV_PCM_TRIGGER_START: 557 if (cpu_is_at32ap7000()) { 558 retval = dw_dma_cyclic_start(chip->dma.rx_chan); 559 if (retval) 560 goto out; 561 } else { 562 ptcr = ATMEL_PDC_RXTEN; 563 } 564 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX; 565 break; 566 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 567 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 568 case SNDRV_PCM_TRIGGER_STOP: 569 if (cpu_is_at32ap7000()) 570 dw_dma_cyclic_stop(chip->dma.rx_chan); 571 else 572 ptcr |= (ATMEL_PDC_RXTDIS); 573 if (chip->opened <= 1) 574 camr &= ~AC97C_CMR_CENA; 575 break; 576 default: 577 retval = -EINVAL; 578 break; 579 } 580 581 ac97c_writel(chip, CAMR, camr); 582 if (!cpu_is_at32ap7000()) 583 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 584 out: 585 return retval; 586 } 587 588 static snd_pcm_uframes_t 589 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) 590 { 591 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 592 struct snd_pcm_runtime *runtime = substream->runtime; 593 snd_pcm_uframes_t frames; 594 unsigned long bytes; 595 596 if (cpu_is_at32ap7000()) 597 bytes = dw_dma_get_src_addr(chip->dma.tx_chan); 598 else 599 bytes = readl(chip->regs + ATMEL_PDC_TPR); 600 bytes -= runtime->dma_addr; 601 602 frames = bytes_to_frames(runtime, bytes); 603 if (frames >= runtime->buffer_size) 604 frames -= runtime->buffer_size; 605 return frames; 606 } 607 608 static snd_pcm_uframes_t 609 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) 610 { 611 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 612 struct snd_pcm_runtime *runtime = substream->runtime; 613 snd_pcm_uframes_t frames; 614 unsigned long bytes; 615 616 if (cpu_is_at32ap7000()) 617 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan); 618 else 619 bytes = readl(chip->regs + ATMEL_PDC_RPR); 620 bytes -= runtime->dma_addr; 621 622 frames = bytes_to_frames(runtime, bytes); 623 if (frames >= runtime->buffer_size) 624 frames -= runtime->buffer_size; 625 return frames; 626 } 627 628 static struct snd_pcm_ops atmel_ac97_playback_ops = { 629 .open = atmel_ac97c_playback_open, 630 .close = atmel_ac97c_playback_close, 631 .ioctl = snd_pcm_lib_ioctl, 632 .hw_params = atmel_ac97c_playback_hw_params, 633 .hw_free = atmel_ac97c_playback_hw_free, 634 .prepare = atmel_ac97c_playback_prepare, 635 .trigger = atmel_ac97c_playback_trigger, 636 .pointer = atmel_ac97c_playback_pointer, 637 }; 638 639 static struct snd_pcm_ops atmel_ac97_capture_ops = { 640 .open = atmel_ac97c_capture_open, 641 .close = atmel_ac97c_capture_close, 642 .ioctl = snd_pcm_lib_ioctl, 643 .hw_params = atmel_ac97c_capture_hw_params, 644 .hw_free = atmel_ac97c_capture_hw_free, 645 .prepare = atmel_ac97c_capture_prepare, 646 .trigger = atmel_ac97c_capture_trigger, 647 .pointer = atmel_ac97c_capture_pointer, 648 }; 649 650 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) 651 { 652 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev; 653 irqreturn_t retval = IRQ_NONE; 654 u32 sr = ac97c_readl(chip, SR); 655 u32 casr = ac97c_readl(chip, CASR); 656 u32 cosr = ac97c_readl(chip, COSR); 657 u32 camr = ac97c_readl(chip, CAMR); 658 659 if (sr & AC97C_SR_CAEVT) { 660 struct snd_pcm_runtime *runtime; 661 int offset, next_period, block_size; 662 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n", 663 casr & AC97C_CSR_OVRUN ? " OVRUN" : "", 664 casr & AC97C_CSR_RXRDY ? " RXRDY" : "", 665 casr & AC97C_CSR_UNRUN ? " UNRUN" : "", 666 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 667 casr & AC97C_CSR_TXRDY ? " TXRDY" : "", 668 !casr ? " NONE" : ""); 669 if (!cpu_is_at32ap7000()) { 670 if ((casr & camr) & AC97C_CSR_ENDTX) { 671 runtime = chip->playback_substream->runtime; 672 block_size = frames_to_bytes(runtime, 673 runtime->period_size); 674 chip->playback_period++; 675 676 if (chip->playback_period == runtime->periods) 677 chip->playback_period = 0; 678 next_period = chip->playback_period + 1; 679 if (next_period == runtime->periods) 680 next_period = 0; 681 682 offset = block_size * next_period; 683 684 writel(runtime->dma_addr + offset, 685 chip->regs + ATMEL_PDC_TNPR); 686 writel(block_size / 2, 687 chip->regs + ATMEL_PDC_TNCR); 688 689 snd_pcm_period_elapsed( 690 chip->playback_substream); 691 } 692 if ((casr & camr) & AC97C_CSR_ENDRX) { 693 runtime = chip->capture_substream->runtime; 694 block_size = frames_to_bytes(runtime, 695 runtime->period_size); 696 chip->capture_period++; 697 698 if (chip->capture_period == runtime->periods) 699 chip->capture_period = 0; 700 next_period = chip->capture_period + 1; 701 if (next_period == runtime->periods) 702 next_period = 0; 703 704 offset = block_size * next_period; 705 706 writel(runtime->dma_addr + offset, 707 chip->regs + ATMEL_PDC_RNPR); 708 writel(block_size / 2, 709 chip->regs + ATMEL_PDC_RNCR); 710 snd_pcm_period_elapsed(chip->capture_substream); 711 } 712 } 713 retval = IRQ_HANDLED; 714 } 715 716 if (sr & AC97C_SR_COEVT) { 717 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n", 718 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "", 719 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "", 720 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 721 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "", 722 !cosr ? " NONE" : ""); 723 retval = IRQ_HANDLED; 724 } 725 726 if (retval == IRQ_NONE) { 727 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x " 728 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr); 729 } 730 731 return retval; 732 } 733 734 static struct ac97_pcm at91_ac97_pcm_defs[] = { 735 /* Playback */ 736 { 737 .exclusive = 1, 738 .r = { { 739 .slots = ((1 << AC97_SLOT_PCM_LEFT) 740 | (1 << AC97_SLOT_PCM_RIGHT)), 741 } }, 742 }, 743 /* PCM in */ 744 { 745 .stream = 1, 746 .exclusive = 1, 747 .r = { { 748 .slots = ((1 << AC97_SLOT_PCM_LEFT) 749 | (1 << AC97_SLOT_PCM_RIGHT)), 750 } } 751 }, 752 /* Mic in */ 753 { 754 .stream = 1, 755 .exclusive = 1, 756 .r = { { 757 .slots = (1<<AC97_SLOT_MIC), 758 } } 759 }, 760 }; 761 762 static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip) 763 { 764 struct snd_pcm *pcm; 765 struct snd_pcm_hardware hw = atmel_ac97c_hw; 766 int capture, playback, retval, err; 767 768 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 769 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 770 771 if (!cpu_is_at32ap7000()) { 772 err = snd_ac97_pcm_assign(chip->ac97_bus, 773 ARRAY_SIZE(at91_ac97_pcm_defs), 774 at91_ac97_pcm_defs); 775 if (err) 776 return err; 777 } 778 retval = snd_pcm_new(chip->card, chip->card->shortname, 779 0, playback, capture, &pcm); 780 if (retval) 781 return retval; 782 783 if (capture) 784 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 785 &atmel_ac97_capture_ops); 786 if (playback) 787 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 788 &atmel_ac97_playback_ops); 789 790 retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, 791 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min, 792 hw.buffer_bytes_max); 793 if (retval) 794 return retval; 795 796 pcm->private_data = chip; 797 pcm->info_flags = 0; 798 strcpy(pcm->name, chip->card->shortname); 799 chip->pcm = pcm; 800 801 return 0; 802 } 803 804 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip) 805 { 806 struct snd_ac97_template template; 807 memset(&template, 0, sizeof(template)); 808 template.private_data = chip; 809 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97); 810 } 811 812 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg, 813 unsigned short val) 814 { 815 struct atmel_ac97c *chip = get_chip(ac97); 816 unsigned long word; 817 int timeout = 40; 818 819 word = (reg & 0x7f) << 16 | val; 820 821 do { 822 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) { 823 ac97c_writel(chip, COTHR, word); 824 return; 825 } 826 udelay(1); 827 } while (--timeout); 828 829 dev_dbg(&chip->pdev->dev, "codec write timeout\n"); 830 } 831 832 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97, 833 unsigned short reg) 834 { 835 struct atmel_ac97c *chip = get_chip(ac97); 836 unsigned long word; 837 int timeout = 40; 838 int write = 10; 839 840 word = (0x80 | (reg & 0x7f)) << 16; 841 842 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) 843 ac97c_readl(chip, CORHR); 844 845 retry_write: 846 timeout = 40; 847 848 do { 849 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) { 850 ac97c_writel(chip, COTHR, word); 851 goto read_reg; 852 } 853 udelay(10); 854 } while (--timeout); 855 856 if (!--write) 857 goto timed_out; 858 goto retry_write; 859 860 read_reg: 861 do { 862 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) { 863 unsigned short val = ac97c_readl(chip, CORHR); 864 return val; 865 } 866 udelay(10); 867 } while (--timeout); 868 869 if (!--write) 870 goto timed_out; 871 goto retry_write; 872 873 timed_out: 874 dev_dbg(&chip->pdev->dev, "codec read timeout\n"); 875 return 0xffff; 876 } 877 878 static bool filter(struct dma_chan *chan, void *slave) 879 { 880 struct dw_dma_slave *dws = slave; 881 882 if (dws->dma_dev == chan->device->dev) { 883 chan->private = dws; 884 return true; 885 } else 886 return false; 887 } 888 889 static void atmel_ac97c_reset(struct atmel_ac97c *chip) 890 { 891 ac97c_writel(chip, MR, 0); 892 ac97c_writel(chip, MR, AC97C_MR_ENA); 893 ac97c_writel(chip, CAMR, 0); 894 ac97c_writel(chip, COMR, 0); 895 896 if (gpio_is_valid(chip->reset_pin)) { 897 gpio_set_value(chip->reset_pin, 0); 898 /* AC97 v2.2 specifications says minimum 1 us. */ 899 udelay(2); 900 gpio_set_value(chip->reset_pin, 1); 901 } else { 902 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA); 903 udelay(2); 904 ac97c_writel(chip, MR, AC97C_MR_ENA); 905 } 906 } 907 908 #ifdef CONFIG_OF 909 static const struct of_device_id atmel_ac97c_dt_ids[] = { 910 { .compatible = "atmel,at91sam9263-ac97c", }, 911 { } 912 }; 913 MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids); 914 915 static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev) 916 { 917 struct ac97c_platform_data *pdata; 918 struct device_node *node = dev->of_node; 919 const struct of_device_id *match; 920 921 if (!node) { 922 dev_err(dev, "Device does not have associated DT data\n"); 923 return ERR_PTR(-EINVAL); 924 } 925 926 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 927 if (!pdata) 928 return ERR_PTR(-ENOMEM); 929 930 pdata->reset_pin = of_get_named_gpio(dev->of_node, "ac97-gpios", 2); 931 932 return pdata; 933 } 934 #else 935 static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev) 936 { 937 dev_err(dev, "no platform data defined\n"); 938 return ERR_PTR(-ENXIO); 939 } 940 #endif 941 942 static int atmel_ac97c_probe(struct platform_device *pdev) 943 { 944 struct snd_card *card; 945 struct atmel_ac97c *chip; 946 struct resource *regs; 947 struct ac97c_platform_data *pdata; 948 struct clk *pclk; 949 static struct snd_ac97_bus_ops ops = { 950 .write = atmel_ac97c_write, 951 .read = atmel_ac97c_read, 952 }; 953 int retval; 954 int irq; 955 956 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 957 if (!regs) { 958 dev_dbg(&pdev->dev, "no memory resource\n"); 959 return -ENXIO; 960 } 961 962 pdata = dev_get_platdata(&pdev->dev); 963 if (!pdata) { 964 pdata = atmel_ac97c_probe_dt(&pdev->dev); 965 if (IS_ERR(pdata)) 966 return PTR_ERR(pdata); 967 } 968 969 irq = platform_get_irq(pdev, 0); 970 if (irq < 0) { 971 dev_dbg(&pdev->dev, "could not get irq\n"); 972 return -ENXIO; 973 } 974 975 if (cpu_is_at32ap7000()) { 976 pclk = clk_get(&pdev->dev, "pclk"); 977 } else { 978 pclk = clk_get(&pdev->dev, "ac97_clk"); 979 } 980 981 if (IS_ERR(pclk)) { 982 dev_dbg(&pdev->dev, "no peripheral clock\n"); 983 return PTR_ERR(pclk); 984 } 985 clk_prepare_enable(pclk); 986 987 retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, 988 SNDRV_DEFAULT_STR1, THIS_MODULE, 989 sizeof(struct atmel_ac97c), &card); 990 if (retval) { 991 dev_dbg(&pdev->dev, "could not create sound card device\n"); 992 goto err_snd_card_new; 993 } 994 995 chip = get_chip(card); 996 997 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip); 998 if (retval) { 999 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq); 1000 goto err_request_irq; 1001 } 1002 chip->irq = irq; 1003 1004 spin_lock_init(&chip->lock); 1005 1006 strcpy(card->driver, "Atmel AC97C"); 1007 strcpy(card->shortname, "Atmel AC97C"); 1008 sprintf(card->longname, "Atmel AC97 controller"); 1009 1010 chip->card = card; 1011 chip->pclk = pclk; 1012 chip->pdev = pdev; 1013 chip->regs = ioremap(regs->start, resource_size(regs)); 1014 1015 if (!chip->regs) { 1016 dev_dbg(&pdev->dev, "could not remap register memory\n"); 1017 retval = -ENOMEM; 1018 goto err_ioremap; 1019 } 1020 1021 if (gpio_is_valid(pdata->reset_pin)) { 1022 if (gpio_request(pdata->reset_pin, "reset_pin")) { 1023 dev_dbg(&pdev->dev, "reset pin not available\n"); 1024 chip->reset_pin = -ENODEV; 1025 } else { 1026 gpio_direction_output(pdata->reset_pin, 1); 1027 chip->reset_pin = pdata->reset_pin; 1028 } 1029 } else { 1030 chip->reset_pin = -EINVAL; 1031 } 1032 1033 atmel_ac97c_reset(chip); 1034 1035 /* Enable overrun interrupt from codec channel */ 1036 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN); 1037 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT); 1038 1039 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus); 1040 if (retval) { 1041 dev_dbg(&pdev->dev, "could not register on ac97 bus\n"); 1042 goto err_ac97_bus; 1043 } 1044 1045 retval = atmel_ac97c_mixer_new(chip); 1046 if (retval) { 1047 dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); 1048 goto err_ac97_bus; 1049 } 1050 1051 if (cpu_is_at32ap7000()) { 1052 if (pdata->rx_dws.dma_dev) { 1053 dma_cap_mask_t mask; 1054 1055 dma_cap_zero(mask); 1056 dma_cap_set(DMA_SLAVE, mask); 1057 1058 chip->dma.rx_chan = dma_request_channel(mask, filter, 1059 &pdata->rx_dws); 1060 if (chip->dma.rx_chan) { 1061 struct dma_slave_config dma_conf = { 1062 .src_addr = regs->start + AC97C_CARHR + 1063 2, 1064 .src_addr_width = 1065 DMA_SLAVE_BUSWIDTH_2_BYTES, 1066 .src_maxburst = 1, 1067 .dst_maxburst = 1, 1068 .direction = DMA_DEV_TO_MEM, 1069 .device_fc = false, 1070 }; 1071 1072 dmaengine_slave_config(chip->dma.rx_chan, 1073 &dma_conf); 1074 } 1075 1076 dev_info(&chip->pdev->dev, "using %s for DMA RX\n", 1077 dev_name(&chip->dma.rx_chan->dev->device)); 1078 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1079 } 1080 1081 if (pdata->tx_dws.dma_dev) { 1082 dma_cap_mask_t mask; 1083 1084 dma_cap_zero(mask); 1085 dma_cap_set(DMA_SLAVE, mask); 1086 1087 chip->dma.tx_chan = dma_request_channel(mask, filter, 1088 &pdata->tx_dws); 1089 if (chip->dma.tx_chan) { 1090 struct dma_slave_config dma_conf = { 1091 .dst_addr = regs->start + AC97C_CATHR + 1092 2, 1093 .dst_addr_width = 1094 DMA_SLAVE_BUSWIDTH_2_BYTES, 1095 .src_maxburst = 1, 1096 .dst_maxburst = 1, 1097 .direction = DMA_MEM_TO_DEV, 1098 .device_fc = false, 1099 }; 1100 1101 dmaengine_slave_config(chip->dma.tx_chan, 1102 &dma_conf); 1103 } 1104 1105 dev_info(&chip->pdev->dev, "using %s for DMA TX\n", 1106 dev_name(&chip->dma.tx_chan->dev->device)); 1107 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1108 } 1109 1110 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) && 1111 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) { 1112 dev_dbg(&pdev->dev, "DMA not available\n"); 1113 retval = -ENODEV; 1114 goto err_dma; 1115 } 1116 } else { 1117 /* Just pretend that we have DMA channel(for at91 i is actually 1118 * the PDC) */ 1119 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1120 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1121 } 1122 1123 retval = atmel_ac97c_pcm_new(chip); 1124 if (retval) { 1125 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n"); 1126 goto err_dma; 1127 } 1128 1129 retval = snd_card_register(card); 1130 if (retval) { 1131 dev_dbg(&pdev->dev, "could not register sound card\n"); 1132 goto err_dma; 1133 } 1134 1135 platform_set_drvdata(pdev, card); 1136 1137 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n", 1138 chip->regs, irq); 1139 1140 return 0; 1141 1142 err_dma: 1143 if (cpu_is_at32ap7000()) { 1144 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) 1145 dma_release_channel(chip->dma.rx_chan); 1146 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) 1147 dma_release_channel(chip->dma.tx_chan); 1148 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1149 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1150 chip->dma.rx_chan = NULL; 1151 chip->dma.tx_chan = NULL; 1152 } 1153 err_ac97_bus: 1154 if (gpio_is_valid(chip->reset_pin)) 1155 gpio_free(chip->reset_pin); 1156 1157 iounmap(chip->regs); 1158 err_ioremap: 1159 free_irq(irq, chip); 1160 err_request_irq: 1161 snd_card_free(card); 1162 err_snd_card_new: 1163 clk_disable_unprepare(pclk); 1164 clk_put(pclk); 1165 return retval; 1166 } 1167 1168 #ifdef CONFIG_PM_SLEEP 1169 static int atmel_ac97c_suspend(struct device *pdev) 1170 { 1171 struct snd_card *card = dev_get_drvdata(pdev); 1172 struct atmel_ac97c *chip = card->private_data; 1173 1174 if (cpu_is_at32ap7000()) { 1175 if (test_bit(DMA_RX_READY, &chip->flags)) 1176 dw_dma_cyclic_stop(chip->dma.rx_chan); 1177 if (test_bit(DMA_TX_READY, &chip->flags)) 1178 dw_dma_cyclic_stop(chip->dma.tx_chan); 1179 } 1180 clk_disable_unprepare(chip->pclk); 1181 1182 return 0; 1183 } 1184 1185 static int atmel_ac97c_resume(struct device *pdev) 1186 { 1187 struct snd_card *card = dev_get_drvdata(pdev); 1188 struct atmel_ac97c *chip = card->private_data; 1189 1190 clk_prepare_enable(chip->pclk); 1191 if (cpu_is_at32ap7000()) { 1192 if (test_bit(DMA_RX_READY, &chip->flags)) 1193 dw_dma_cyclic_start(chip->dma.rx_chan); 1194 if (test_bit(DMA_TX_READY, &chip->flags)) 1195 dw_dma_cyclic_start(chip->dma.tx_chan); 1196 } 1197 return 0; 1198 } 1199 1200 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume); 1201 #define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm 1202 #else 1203 #define ATMEL_AC97C_PM_OPS NULL 1204 #endif 1205 1206 static int atmel_ac97c_remove(struct platform_device *pdev) 1207 { 1208 struct snd_card *card = platform_get_drvdata(pdev); 1209 struct atmel_ac97c *chip = get_chip(card); 1210 1211 if (gpio_is_valid(chip->reset_pin)) 1212 gpio_free(chip->reset_pin); 1213 1214 ac97c_writel(chip, CAMR, 0); 1215 ac97c_writel(chip, COMR, 0); 1216 ac97c_writel(chip, MR, 0); 1217 1218 clk_disable_unprepare(chip->pclk); 1219 clk_put(chip->pclk); 1220 iounmap(chip->regs); 1221 free_irq(chip->irq, chip); 1222 1223 if (cpu_is_at32ap7000()) { 1224 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) 1225 dma_release_channel(chip->dma.rx_chan); 1226 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) 1227 dma_release_channel(chip->dma.tx_chan); 1228 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1229 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1230 chip->dma.rx_chan = NULL; 1231 chip->dma.tx_chan = NULL; 1232 } 1233 1234 snd_card_free(card); 1235 1236 return 0; 1237 } 1238 1239 static struct platform_driver atmel_ac97c_driver = { 1240 .probe = atmel_ac97c_probe, 1241 .remove = atmel_ac97c_remove, 1242 .driver = { 1243 .name = "atmel_ac97c", 1244 .pm = ATMEL_AC97C_PM_OPS, 1245 .of_match_table = of_match_ptr(atmel_ac97c_dt_ids), 1246 }, 1247 }; 1248 module_platform_driver(atmel_ac97c_driver); 1249 1250 MODULE_LICENSE("GPL"); 1251 MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); 1252 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); 1253