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/io.h> 24 25 #include <sound/core.h> 26 #include <sound/initval.h> 27 #include <sound/pcm.h> 28 #include <sound/pcm_params.h> 29 #include <sound/ac97_codec.h> 30 #include <sound/atmel-ac97c.h> 31 #include <sound/memalloc.h> 32 33 #include <linux/dw_dmac.h> 34 35 #include <mach/cpu.h> 36 #include <mach/hardware.h> 37 #include <mach/gpio.h> 38 39 #include "ac97c.h" 40 41 enum { 42 DMA_TX_READY = 0, 43 DMA_RX_READY, 44 DMA_TX_CHAN_PRESENT, 45 DMA_RX_CHAN_PRESENT, 46 }; 47 48 /* Serialize access to opened variable */ 49 static DEFINE_MUTEX(opened_mutex); 50 51 struct atmel_ac97c_dma { 52 struct dma_chan *rx_chan; 53 struct dma_chan *tx_chan; 54 }; 55 56 struct atmel_ac97c { 57 struct clk *pclk; 58 struct platform_device *pdev; 59 struct atmel_ac97c_dma dma; 60 61 struct snd_pcm_substream *playback_substream; 62 struct snd_pcm_substream *capture_substream; 63 struct snd_card *card; 64 struct snd_pcm *pcm; 65 struct snd_ac97 *ac97; 66 struct snd_ac97_bus *ac97_bus; 67 68 u64 cur_format; 69 unsigned int cur_rate; 70 unsigned long flags; 71 int playback_period, capture_period; 72 /* Serialize access to opened variable */ 73 spinlock_t lock; 74 void __iomem *regs; 75 int irq; 76 int opened; 77 int reset_pin; 78 }; 79 80 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data) 81 82 #define ac97c_writel(chip, reg, val) \ 83 __raw_writel((val), (chip)->regs + AC97C_##reg) 84 #define ac97c_readl(chip, reg) \ 85 __raw_readl((chip)->regs + AC97C_##reg) 86 87 /* This function is called by the DMA driver. */ 88 static void atmel_ac97c_dma_playback_period_done(void *arg) 89 { 90 struct atmel_ac97c *chip = arg; 91 snd_pcm_period_elapsed(chip->playback_substream); 92 } 93 94 static void atmel_ac97c_dma_capture_period_done(void *arg) 95 { 96 struct atmel_ac97c *chip = arg; 97 snd_pcm_period_elapsed(chip->capture_substream); 98 } 99 100 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip, 101 struct snd_pcm_substream *substream, 102 enum dma_data_direction direction) 103 { 104 struct dma_chan *chan; 105 struct dw_cyclic_desc *cdesc; 106 struct snd_pcm_runtime *runtime = substream->runtime; 107 unsigned long buffer_len, period_len; 108 109 /* 110 * We don't do DMA on "complex" transfers, i.e. with 111 * non-halfword-aligned buffers or lengths. 112 */ 113 if (runtime->dma_addr & 1 || runtime->buffer_size & 1) { 114 dev_dbg(&chip->pdev->dev, "too complex transfer\n"); 115 return -EINVAL; 116 } 117 118 if (direction == DMA_TO_DEVICE) 119 chan = chip->dma.tx_chan; 120 else 121 chan = chip->dma.rx_chan; 122 123 buffer_len = frames_to_bytes(runtime, runtime->buffer_size); 124 period_len = frames_to_bytes(runtime, runtime->period_size); 125 126 cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len, 127 period_len, direction); 128 if (IS_ERR(cdesc)) { 129 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n"); 130 return PTR_ERR(cdesc); 131 } 132 133 if (direction == DMA_TO_DEVICE) { 134 cdesc->period_callback = atmel_ac97c_dma_playback_period_done; 135 set_bit(DMA_TX_READY, &chip->flags); 136 } else { 137 cdesc->period_callback = atmel_ac97c_dma_capture_period_done; 138 set_bit(DMA_RX_READY, &chip->flags); 139 } 140 141 cdesc->period_callback_param = chip; 142 143 return 0; 144 } 145 146 static struct snd_pcm_hardware atmel_ac97c_hw = { 147 .info = (SNDRV_PCM_INFO_MMAP 148 | SNDRV_PCM_INFO_MMAP_VALID 149 | SNDRV_PCM_INFO_INTERLEAVED 150 | SNDRV_PCM_INFO_BLOCK_TRANSFER 151 | SNDRV_PCM_INFO_JOINT_DUPLEX 152 | SNDRV_PCM_INFO_RESUME 153 | SNDRV_PCM_INFO_PAUSE), 154 .formats = (SNDRV_PCM_FMTBIT_S16_BE 155 | SNDRV_PCM_FMTBIT_S16_LE), 156 .rates = (SNDRV_PCM_RATE_CONTINUOUS), 157 .rate_min = 4000, 158 .rate_max = 48000, 159 .channels_min = 1, 160 .channels_max = 2, 161 .buffer_bytes_max = 2 * 2 * 64 * 2048, 162 .period_bytes_min = 4096, 163 .period_bytes_max = 4096, 164 .periods_min = 6, 165 .periods_max = 64, 166 }; 167 168 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) 169 { 170 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 171 struct snd_pcm_runtime *runtime = substream->runtime; 172 173 mutex_lock(&opened_mutex); 174 chip->opened++; 175 runtime->hw = atmel_ac97c_hw; 176 if (chip->cur_rate) { 177 runtime->hw.rate_min = chip->cur_rate; 178 runtime->hw.rate_max = chip->cur_rate; 179 } 180 if (chip->cur_format) 181 runtime->hw.formats = (1ULL << chip->cur_format); 182 mutex_unlock(&opened_mutex); 183 chip->playback_substream = substream; 184 return 0; 185 } 186 187 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) 188 { 189 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 190 struct snd_pcm_runtime *runtime = substream->runtime; 191 192 mutex_lock(&opened_mutex); 193 chip->opened++; 194 runtime->hw = atmel_ac97c_hw; 195 if (chip->cur_rate) { 196 runtime->hw.rate_min = chip->cur_rate; 197 runtime->hw.rate_max = chip->cur_rate; 198 } 199 if (chip->cur_format) 200 runtime->hw.formats = (1ULL << chip->cur_format); 201 mutex_unlock(&opened_mutex); 202 chip->capture_substream = substream; 203 return 0; 204 } 205 206 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) 207 { 208 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 209 210 mutex_lock(&opened_mutex); 211 chip->opened--; 212 if (!chip->opened) { 213 chip->cur_rate = 0; 214 chip->cur_format = 0; 215 } 216 mutex_unlock(&opened_mutex); 217 218 chip->playback_substream = NULL; 219 220 return 0; 221 } 222 223 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) 224 { 225 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 226 227 mutex_lock(&opened_mutex); 228 chip->opened--; 229 if (!chip->opened) { 230 chip->cur_rate = 0; 231 chip->cur_format = 0; 232 } 233 mutex_unlock(&opened_mutex); 234 235 chip->capture_substream = NULL; 236 237 return 0; 238 } 239 240 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, 241 struct snd_pcm_hw_params *hw_params) 242 { 243 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 244 int retval; 245 246 retval = snd_pcm_lib_malloc_pages(substream, 247 params_buffer_bytes(hw_params)); 248 if (retval < 0) 249 return retval; 250 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 251 if (cpu_is_at32ap7000()) { 252 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 253 if (retval == 1) 254 if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) 255 dw_dma_cyclic_free(chip->dma.tx_chan); 256 } 257 /* Set restrictions to params. */ 258 mutex_lock(&opened_mutex); 259 chip->cur_rate = params_rate(hw_params); 260 chip->cur_format = params_format(hw_params); 261 mutex_unlock(&opened_mutex); 262 263 return retval; 264 } 265 266 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, 267 struct snd_pcm_hw_params *hw_params) 268 { 269 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 270 int retval; 271 272 retval = snd_pcm_lib_malloc_pages(substream, 273 params_buffer_bytes(hw_params)); 274 if (retval < 0) 275 return retval; 276 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 277 if (cpu_is_at32ap7000()) { 278 if (retval < 0) 279 return retval; 280 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 281 if (retval == 1) 282 if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) 283 dw_dma_cyclic_free(chip->dma.rx_chan); 284 } 285 286 /* Set restrictions to params. */ 287 mutex_lock(&opened_mutex); 288 chip->cur_rate = params_rate(hw_params); 289 chip->cur_format = params_format(hw_params); 290 mutex_unlock(&opened_mutex); 291 292 return retval; 293 } 294 295 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream) 296 { 297 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 298 if (cpu_is_at32ap7000()) { 299 if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) 300 dw_dma_cyclic_free(chip->dma.tx_chan); 301 } 302 return snd_pcm_lib_free_pages(substream); 303 } 304 305 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream) 306 { 307 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 308 if (cpu_is_at32ap7000()) { 309 if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) 310 dw_dma_cyclic_free(chip->dma.rx_chan); 311 } 312 return snd_pcm_lib_free_pages(substream); 313 } 314 315 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) 316 { 317 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 318 struct snd_pcm_runtime *runtime = substream->runtime; 319 int block_size = frames_to_bytes(runtime, runtime->period_size); 320 unsigned long word = ac97c_readl(chip, OCA); 321 int retval; 322 323 chip->playback_period = 0; 324 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 325 326 /* assign channels to AC97C channel A */ 327 switch (runtime->channels) { 328 case 1: 329 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 330 break; 331 case 2: 332 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 333 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 334 break; 335 default: 336 /* TODO: support more than two channels */ 337 return -EINVAL; 338 } 339 ac97c_writel(chip, OCA, word); 340 341 /* configure sample format and size */ 342 word = ac97c_readl(chip, CAMR); 343 if (chip->opened <= 1) 344 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 345 else 346 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 347 348 switch (runtime->format) { 349 case SNDRV_PCM_FORMAT_S16_LE: 350 if (cpu_is_at32ap7000()) 351 word |= AC97C_CMR_CEM_LITTLE; 352 break; 353 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 354 word &= ~(AC97C_CMR_CEM_LITTLE); 355 break; 356 default: 357 word = ac97c_readl(chip, OCA); 358 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 359 ac97c_writel(chip, OCA, word); 360 return -EINVAL; 361 } 362 363 /* Enable underrun interrupt on channel A */ 364 word |= AC97C_CSR_UNRUN; 365 366 ac97c_writel(chip, CAMR, word); 367 368 /* Enable channel A event interrupt */ 369 word = ac97c_readl(chip, IMR); 370 word |= AC97C_SR_CAEVT; 371 ac97c_writel(chip, IER, word); 372 373 /* set variable rate if needed */ 374 if (runtime->rate != 48000) { 375 word = ac97c_readl(chip, MR); 376 word |= AC97C_MR_VRA; 377 ac97c_writel(chip, MR, word); 378 } else { 379 word = ac97c_readl(chip, MR); 380 word &= ~(AC97C_MR_VRA); 381 ac97c_writel(chip, MR, word); 382 } 383 384 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, 385 runtime->rate); 386 if (retval) 387 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 388 runtime->rate); 389 390 if (cpu_is_at32ap7000()) { 391 if (!test_bit(DMA_TX_READY, &chip->flags)) 392 retval = atmel_ac97c_prepare_dma(chip, substream, 393 DMA_TO_DEVICE); 394 } else { 395 /* Initialize and start the PDC */ 396 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR); 397 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR); 398 writel(runtime->dma_addr + block_size, 399 chip->regs + ATMEL_PDC_TNPR); 400 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR); 401 } 402 403 return retval; 404 } 405 406 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) 407 { 408 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 409 struct snd_pcm_runtime *runtime = substream->runtime; 410 int block_size = frames_to_bytes(runtime, runtime->period_size); 411 unsigned long word = ac97c_readl(chip, ICA); 412 int retval; 413 414 chip->capture_period = 0; 415 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 416 417 /* assign channels to AC97C channel A */ 418 switch (runtime->channels) { 419 case 1: 420 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 421 break; 422 case 2: 423 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 424 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 425 break; 426 default: 427 /* TODO: support more than two channels */ 428 return -EINVAL; 429 } 430 ac97c_writel(chip, ICA, word); 431 432 /* configure sample format and size */ 433 word = ac97c_readl(chip, CAMR); 434 if (chip->opened <= 1) 435 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 436 else 437 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 438 439 switch (runtime->format) { 440 case SNDRV_PCM_FORMAT_S16_LE: 441 if (cpu_is_at32ap7000()) 442 word |= AC97C_CMR_CEM_LITTLE; 443 break; 444 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 445 word &= ~(AC97C_CMR_CEM_LITTLE); 446 break; 447 default: 448 word = ac97c_readl(chip, ICA); 449 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 450 ac97c_writel(chip, ICA, word); 451 return -EINVAL; 452 } 453 454 /* Enable overrun interrupt on channel A */ 455 word |= AC97C_CSR_OVRUN; 456 457 ac97c_writel(chip, CAMR, word); 458 459 /* Enable channel A event interrupt */ 460 word = ac97c_readl(chip, IMR); 461 word |= AC97C_SR_CAEVT; 462 ac97c_writel(chip, IER, word); 463 464 /* set variable rate if needed */ 465 if (runtime->rate != 48000) { 466 word = ac97c_readl(chip, MR); 467 word |= AC97C_MR_VRA; 468 ac97c_writel(chip, MR, word); 469 } else { 470 word = ac97c_readl(chip, MR); 471 word &= ~(AC97C_MR_VRA); 472 ac97c_writel(chip, MR, word); 473 } 474 475 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, 476 runtime->rate); 477 if (retval) 478 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 479 runtime->rate); 480 481 if (cpu_is_at32ap7000()) { 482 if (!test_bit(DMA_RX_READY, &chip->flags)) 483 retval = atmel_ac97c_prepare_dma(chip, substream, 484 DMA_FROM_DEVICE); 485 } else { 486 /* Initialize and start the PDC */ 487 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR); 488 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR); 489 writel(runtime->dma_addr + block_size, 490 chip->regs + ATMEL_PDC_RNPR); 491 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR); 492 } 493 494 return retval; 495 } 496 497 static int 498 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) 499 { 500 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 501 unsigned long camr, ptcr = 0; 502 int retval = 0; 503 504 camr = ac97c_readl(chip, CAMR); 505 506 switch (cmd) { 507 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 508 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 509 case SNDRV_PCM_TRIGGER_START: 510 if (cpu_is_at32ap7000()) { 511 retval = dw_dma_cyclic_start(chip->dma.tx_chan); 512 if (retval) 513 goto out; 514 } else { 515 ptcr = ATMEL_PDC_TXTEN; 516 } 517 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX; 518 break; 519 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 520 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 521 case SNDRV_PCM_TRIGGER_STOP: 522 if (cpu_is_at32ap7000()) 523 dw_dma_cyclic_stop(chip->dma.tx_chan); 524 else 525 ptcr |= ATMEL_PDC_TXTDIS; 526 if (chip->opened <= 1) 527 camr &= ~AC97C_CMR_CENA; 528 break; 529 default: 530 retval = -EINVAL; 531 goto out; 532 } 533 534 ac97c_writel(chip, CAMR, camr); 535 if (!cpu_is_at32ap7000()) 536 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 537 out: 538 return retval; 539 } 540 541 static int 542 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) 543 { 544 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 545 unsigned long camr, ptcr = 0; 546 int retval = 0; 547 548 camr = ac97c_readl(chip, CAMR); 549 ptcr = readl(chip->regs + ATMEL_PDC_PTSR); 550 551 switch (cmd) { 552 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 553 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 554 case SNDRV_PCM_TRIGGER_START: 555 if (cpu_is_at32ap7000()) { 556 retval = dw_dma_cyclic_start(chip->dma.rx_chan); 557 if (retval) 558 goto out; 559 } else { 560 ptcr = ATMEL_PDC_RXTEN; 561 } 562 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX; 563 break; 564 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 565 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 566 case SNDRV_PCM_TRIGGER_STOP: 567 if (cpu_is_at32ap7000()) 568 dw_dma_cyclic_stop(chip->dma.rx_chan); 569 else 570 ptcr |= (ATMEL_PDC_RXTDIS); 571 if (chip->opened <= 1) 572 camr &= ~AC97C_CMR_CENA; 573 break; 574 default: 575 retval = -EINVAL; 576 break; 577 } 578 579 ac97c_writel(chip, CAMR, camr); 580 if (!cpu_is_at32ap7000()) 581 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 582 out: 583 return retval; 584 } 585 586 static snd_pcm_uframes_t 587 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) 588 { 589 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 590 struct snd_pcm_runtime *runtime = substream->runtime; 591 snd_pcm_uframes_t frames; 592 unsigned long bytes; 593 594 if (cpu_is_at32ap7000()) 595 bytes = dw_dma_get_src_addr(chip->dma.tx_chan); 596 else 597 bytes = readl(chip->regs + ATMEL_PDC_TPR); 598 bytes -= runtime->dma_addr; 599 600 frames = bytes_to_frames(runtime, bytes); 601 if (frames >= runtime->buffer_size) 602 frames -= runtime->buffer_size; 603 return frames; 604 } 605 606 static snd_pcm_uframes_t 607 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) 608 { 609 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 610 struct snd_pcm_runtime *runtime = substream->runtime; 611 snd_pcm_uframes_t frames; 612 unsigned long bytes; 613 614 if (cpu_is_at32ap7000()) 615 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan); 616 else 617 bytes = readl(chip->regs + ATMEL_PDC_RPR); 618 bytes -= runtime->dma_addr; 619 620 frames = bytes_to_frames(runtime, bytes); 621 if (frames >= runtime->buffer_size) 622 frames -= runtime->buffer_size; 623 return frames; 624 } 625 626 static struct snd_pcm_ops atmel_ac97_playback_ops = { 627 .open = atmel_ac97c_playback_open, 628 .close = atmel_ac97c_playback_close, 629 .ioctl = snd_pcm_lib_ioctl, 630 .hw_params = atmel_ac97c_playback_hw_params, 631 .hw_free = atmel_ac97c_playback_hw_free, 632 .prepare = atmel_ac97c_playback_prepare, 633 .trigger = atmel_ac97c_playback_trigger, 634 .pointer = atmel_ac97c_playback_pointer, 635 }; 636 637 static struct snd_pcm_ops atmel_ac97_capture_ops = { 638 .open = atmel_ac97c_capture_open, 639 .close = atmel_ac97c_capture_close, 640 .ioctl = snd_pcm_lib_ioctl, 641 .hw_params = atmel_ac97c_capture_hw_params, 642 .hw_free = atmel_ac97c_capture_hw_free, 643 .prepare = atmel_ac97c_capture_prepare, 644 .trigger = atmel_ac97c_capture_trigger, 645 .pointer = atmel_ac97c_capture_pointer, 646 }; 647 648 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) 649 { 650 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev; 651 irqreturn_t retval = IRQ_NONE; 652 u32 sr = ac97c_readl(chip, SR); 653 u32 casr = ac97c_readl(chip, CASR); 654 u32 cosr = ac97c_readl(chip, COSR); 655 u32 camr = ac97c_readl(chip, CAMR); 656 657 if (sr & AC97C_SR_CAEVT) { 658 struct snd_pcm_runtime *runtime; 659 int offset, next_period, block_size; 660 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n", 661 casr & AC97C_CSR_OVRUN ? " OVRUN" : "", 662 casr & AC97C_CSR_RXRDY ? " RXRDY" : "", 663 casr & AC97C_CSR_UNRUN ? " UNRUN" : "", 664 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 665 casr & AC97C_CSR_TXRDY ? " TXRDY" : "", 666 !casr ? " NONE" : ""); 667 if (!cpu_is_at32ap7000()) { 668 if ((casr & camr) & AC97C_CSR_ENDTX) { 669 runtime = chip->playback_substream->runtime; 670 block_size = frames_to_bytes(runtime, 671 runtime->period_size); 672 chip->playback_period++; 673 674 if (chip->playback_period == runtime->periods) 675 chip->playback_period = 0; 676 next_period = chip->playback_period + 1; 677 if (next_period == runtime->periods) 678 next_period = 0; 679 680 offset = block_size * next_period; 681 682 writel(runtime->dma_addr + offset, 683 chip->regs + ATMEL_PDC_TNPR); 684 writel(block_size / 2, 685 chip->regs + ATMEL_PDC_TNCR); 686 687 snd_pcm_period_elapsed( 688 chip->playback_substream); 689 } 690 if ((casr & camr) & AC97C_CSR_ENDRX) { 691 runtime = chip->capture_substream->runtime; 692 block_size = frames_to_bytes(runtime, 693 runtime->period_size); 694 chip->capture_period++; 695 696 if (chip->capture_period == runtime->periods) 697 chip->capture_period = 0; 698 next_period = chip->capture_period + 1; 699 if (next_period == runtime->periods) 700 next_period = 0; 701 702 offset = block_size * next_period; 703 704 writel(runtime->dma_addr + offset, 705 chip->regs + ATMEL_PDC_RNPR); 706 writel(block_size / 2, 707 chip->regs + ATMEL_PDC_RNCR); 708 snd_pcm_period_elapsed(chip->capture_substream); 709 } 710 } 711 retval = IRQ_HANDLED; 712 } 713 714 if (sr & AC97C_SR_COEVT) { 715 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n", 716 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "", 717 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "", 718 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 719 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "", 720 !cosr ? " NONE" : ""); 721 retval = IRQ_HANDLED; 722 } 723 724 if (retval == IRQ_NONE) { 725 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x " 726 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr); 727 } 728 729 return retval; 730 } 731 732 static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = { 733 /* Playback */ 734 { 735 .exclusive = 1, 736 .r = { { 737 .slots = ((1 << AC97_SLOT_PCM_LEFT) 738 | (1 << AC97_SLOT_PCM_RIGHT)), 739 } }, 740 }, 741 /* PCM in */ 742 { 743 .stream = 1, 744 .exclusive = 1, 745 .r = { { 746 .slots = ((1 << AC97_SLOT_PCM_LEFT) 747 | (1 << AC97_SLOT_PCM_RIGHT)), 748 } } 749 }, 750 /* Mic in */ 751 { 752 .stream = 1, 753 .exclusive = 1, 754 .r = { { 755 .slots = (1<<AC97_SLOT_MIC), 756 } } 757 }, 758 }; 759 760 static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip) 761 { 762 struct snd_pcm *pcm; 763 struct snd_pcm_hardware hw = atmel_ac97c_hw; 764 int capture, playback, retval, err; 765 766 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 767 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 768 769 if (!cpu_is_at32ap7000()) { 770 err = snd_ac97_pcm_assign(chip->ac97_bus, 771 ARRAY_SIZE(at91_ac97_pcm_defs), 772 at91_ac97_pcm_defs); 773 if (err) 774 return err; 775 } 776 retval = snd_pcm_new(chip->card, chip->card->shortname, 777 chip->pdev->id, playback, capture, &pcm); 778 if (retval) 779 return retval; 780 781 if (capture) 782 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 783 &atmel_ac97_capture_ops); 784 if (playback) 785 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 786 &atmel_ac97_playback_ops); 787 788 retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, 789 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min, 790 hw.buffer_bytes_max); 791 if (retval) 792 return retval; 793 794 pcm->private_data = chip; 795 pcm->info_flags = 0; 796 strcpy(pcm->name, chip->card->shortname); 797 chip->pcm = pcm; 798 799 return 0; 800 } 801 802 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip) 803 { 804 struct snd_ac97_template template; 805 memset(&template, 0, sizeof(template)); 806 template.private_data = chip; 807 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97); 808 } 809 810 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg, 811 unsigned short val) 812 { 813 struct atmel_ac97c *chip = get_chip(ac97); 814 unsigned long word; 815 int timeout = 40; 816 817 word = (reg & 0x7f) << 16 | val; 818 819 do { 820 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) { 821 ac97c_writel(chip, COTHR, word); 822 return; 823 } 824 udelay(1); 825 } while (--timeout); 826 827 dev_dbg(&chip->pdev->dev, "codec write timeout\n"); 828 } 829 830 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97, 831 unsigned short reg) 832 { 833 struct atmel_ac97c *chip = get_chip(ac97); 834 unsigned long word; 835 int timeout = 40; 836 int write = 10; 837 838 word = (0x80 | (reg & 0x7f)) << 16; 839 840 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) 841 ac97c_readl(chip, CORHR); 842 843 retry_write: 844 timeout = 40; 845 846 do { 847 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) { 848 ac97c_writel(chip, COTHR, word); 849 goto read_reg; 850 } 851 udelay(10); 852 } while (--timeout); 853 854 if (!--write) 855 goto timed_out; 856 goto retry_write; 857 858 read_reg: 859 do { 860 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) { 861 unsigned short val = ac97c_readl(chip, CORHR); 862 return val; 863 } 864 udelay(10); 865 } while (--timeout); 866 867 if (!--write) 868 goto timed_out; 869 goto retry_write; 870 871 timed_out: 872 dev_dbg(&chip->pdev->dev, "codec read timeout\n"); 873 return 0xffff; 874 } 875 876 static bool filter(struct dma_chan *chan, void *slave) 877 { 878 struct dw_dma_slave *dws = slave; 879 880 if (dws->dma_dev == chan->device->dev) { 881 chan->private = dws; 882 return true; 883 } else 884 return false; 885 } 886 887 static void atmel_ac97c_reset(struct atmel_ac97c *chip) 888 { 889 ac97c_writel(chip, MR, 0); 890 ac97c_writel(chip, MR, AC97C_MR_ENA); 891 ac97c_writel(chip, CAMR, 0); 892 ac97c_writel(chip, COMR, 0); 893 894 if (gpio_is_valid(chip->reset_pin)) { 895 gpio_set_value(chip->reset_pin, 0); 896 /* AC97 v2.2 specifications says minimum 1 us. */ 897 udelay(2); 898 gpio_set_value(chip->reset_pin, 1); 899 } 900 } 901 902 static int __devinit atmel_ac97c_probe(struct platform_device *pdev) 903 { 904 struct snd_card *card; 905 struct atmel_ac97c *chip; 906 struct resource *regs; 907 struct ac97c_platform_data *pdata; 908 struct clk *pclk; 909 static struct snd_ac97_bus_ops ops = { 910 .write = atmel_ac97c_write, 911 .read = atmel_ac97c_read, 912 }; 913 int retval; 914 int irq; 915 916 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 917 if (!regs) { 918 dev_dbg(&pdev->dev, "no memory resource\n"); 919 return -ENXIO; 920 } 921 922 pdata = pdev->dev.platform_data; 923 if (!pdata) { 924 dev_dbg(&pdev->dev, "no platform data\n"); 925 return -ENXIO; 926 } 927 928 irq = platform_get_irq(pdev, 0); 929 if (irq < 0) { 930 dev_dbg(&pdev->dev, "could not get irq\n"); 931 return -ENXIO; 932 } 933 934 if (cpu_is_at32ap7000()) { 935 pclk = clk_get(&pdev->dev, "pclk"); 936 } else { 937 pclk = clk_get(&pdev->dev, "ac97_clk"); 938 } 939 940 if (IS_ERR(pclk)) { 941 dev_dbg(&pdev->dev, "no peripheral clock\n"); 942 return PTR_ERR(pclk); 943 } 944 clk_enable(pclk); 945 946 retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, 947 THIS_MODULE, sizeof(struct atmel_ac97c), &card); 948 if (retval) { 949 dev_dbg(&pdev->dev, "could not create sound card device\n"); 950 goto err_snd_card_new; 951 } 952 953 chip = get_chip(card); 954 955 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip); 956 if (retval) { 957 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq); 958 goto err_request_irq; 959 } 960 chip->irq = irq; 961 962 spin_lock_init(&chip->lock); 963 964 strcpy(card->driver, "Atmel AC97C"); 965 strcpy(card->shortname, "Atmel AC97C"); 966 sprintf(card->longname, "Atmel AC97 controller"); 967 968 chip->card = card; 969 chip->pclk = pclk; 970 chip->pdev = pdev; 971 chip->regs = ioremap(regs->start, regs->end - regs->start + 1); 972 973 if (!chip->regs) { 974 dev_dbg(&pdev->dev, "could not remap register memory\n"); 975 goto err_ioremap; 976 } 977 978 if (gpio_is_valid(pdata->reset_pin)) { 979 if (gpio_request(pdata->reset_pin, "reset_pin")) { 980 dev_dbg(&pdev->dev, "reset pin not available\n"); 981 chip->reset_pin = -ENODEV; 982 } else { 983 gpio_direction_output(pdata->reset_pin, 1); 984 chip->reset_pin = pdata->reset_pin; 985 } 986 } 987 988 snd_card_set_dev(card, &pdev->dev); 989 990 atmel_ac97c_reset(chip); 991 992 /* Enable overrun interrupt from codec channel */ 993 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN); 994 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT); 995 996 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus); 997 if (retval) { 998 dev_dbg(&pdev->dev, "could not register on ac97 bus\n"); 999 goto err_ac97_bus; 1000 } 1001 1002 retval = atmel_ac97c_mixer_new(chip); 1003 if (retval) { 1004 dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); 1005 goto err_ac97_bus; 1006 } 1007 1008 if (cpu_is_at32ap7000()) { 1009 if (pdata->rx_dws.dma_dev) { 1010 struct dw_dma_slave *dws = &pdata->rx_dws; 1011 dma_cap_mask_t mask; 1012 1013 dws->rx_reg = regs->start + AC97C_CARHR + 2; 1014 1015 dma_cap_zero(mask); 1016 dma_cap_set(DMA_SLAVE, mask); 1017 1018 chip->dma.rx_chan = dma_request_channel(mask, filter, 1019 dws); 1020 1021 dev_info(&chip->pdev->dev, "using %s for DMA RX\n", 1022 dev_name(&chip->dma.rx_chan->dev->device)); 1023 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1024 } 1025 1026 if (pdata->tx_dws.dma_dev) { 1027 struct dw_dma_slave *dws = &pdata->tx_dws; 1028 dma_cap_mask_t mask; 1029 1030 dws->tx_reg = regs->start + AC97C_CATHR + 2; 1031 1032 dma_cap_zero(mask); 1033 dma_cap_set(DMA_SLAVE, mask); 1034 1035 chip->dma.tx_chan = dma_request_channel(mask, filter, 1036 dws); 1037 1038 dev_info(&chip->pdev->dev, "using %s for DMA TX\n", 1039 dev_name(&chip->dma.tx_chan->dev->device)); 1040 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1041 } 1042 1043 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) && 1044 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) { 1045 dev_dbg(&pdev->dev, "DMA not available\n"); 1046 retval = -ENODEV; 1047 goto err_dma; 1048 } 1049 } else { 1050 /* Just pretend that we have DMA channel(for at91 i is actually 1051 * the PDC) */ 1052 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1053 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1054 } 1055 1056 retval = atmel_ac97c_pcm_new(chip); 1057 if (retval) { 1058 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n"); 1059 goto err_dma; 1060 } 1061 1062 retval = snd_card_register(card); 1063 if (retval) { 1064 dev_dbg(&pdev->dev, "could not register sound card\n"); 1065 goto err_dma; 1066 } 1067 1068 platform_set_drvdata(pdev, card); 1069 1070 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n", 1071 chip->regs, irq); 1072 1073 return 0; 1074 1075 err_dma: 1076 if (cpu_is_at32ap7000()) { 1077 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) 1078 dma_release_channel(chip->dma.rx_chan); 1079 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) 1080 dma_release_channel(chip->dma.tx_chan); 1081 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1082 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1083 chip->dma.rx_chan = NULL; 1084 chip->dma.tx_chan = NULL; 1085 } 1086 err_ac97_bus: 1087 snd_card_set_dev(card, NULL); 1088 1089 if (gpio_is_valid(chip->reset_pin)) 1090 gpio_free(chip->reset_pin); 1091 1092 iounmap(chip->regs); 1093 err_ioremap: 1094 free_irq(irq, chip); 1095 err_request_irq: 1096 snd_card_free(card); 1097 err_snd_card_new: 1098 clk_disable(pclk); 1099 clk_put(pclk); 1100 return retval; 1101 } 1102 1103 #ifdef CONFIG_PM 1104 static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg) 1105 { 1106 struct snd_card *card = platform_get_drvdata(pdev); 1107 struct atmel_ac97c *chip = card->private_data; 1108 1109 if (cpu_is_at32ap7000()) { 1110 if (test_bit(DMA_RX_READY, &chip->flags)) 1111 dw_dma_cyclic_stop(chip->dma.rx_chan); 1112 if (test_bit(DMA_TX_READY, &chip->flags)) 1113 dw_dma_cyclic_stop(chip->dma.tx_chan); 1114 } 1115 clk_disable(chip->pclk); 1116 1117 return 0; 1118 } 1119 1120 static int atmel_ac97c_resume(struct platform_device *pdev) 1121 { 1122 struct snd_card *card = platform_get_drvdata(pdev); 1123 struct atmel_ac97c *chip = card->private_data; 1124 1125 clk_enable(chip->pclk); 1126 if (cpu_is_at32ap7000()) { 1127 if (test_bit(DMA_RX_READY, &chip->flags)) 1128 dw_dma_cyclic_start(chip->dma.rx_chan); 1129 if (test_bit(DMA_TX_READY, &chip->flags)) 1130 dw_dma_cyclic_start(chip->dma.tx_chan); 1131 } 1132 return 0; 1133 } 1134 #else 1135 #define atmel_ac97c_suspend NULL 1136 #define atmel_ac97c_resume NULL 1137 #endif 1138 1139 static int __devexit atmel_ac97c_remove(struct platform_device *pdev) 1140 { 1141 struct snd_card *card = platform_get_drvdata(pdev); 1142 struct atmel_ac97c *chip = get_chip(card); 1143 1144 if (gpio_is_valid(chip->reset_pin)) 1145 gpio_free(chip->reset_pin); 1146 1147 ac97c_writel(chip, CAMR, 0); 1148 ac97c_writel(chip, COMR, 0); 1149 ac97c_writel(chip, MR, 0); 1150 1151 clk_disable(chip->pclk); 1152 clk_put(chip->pclk); 1153 iounmap(chip->regs); 1154 free_irq(chip->irq, chip); 1155 1156 if (cpu_is_at32ap7000()) { 1157 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) 1158 dma_release_channel(chip->dma.rx_chan); 1159 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) 1160 dma_release_channel(chip->dma.tx_chan); 1161 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1162 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1163 chip->dma.rx_chan = NULL; 1164 chip->dma.tx_chan = NULL; 1165 } 1166 1167 snd_card_set_dev(card, NULL); 1168 snd_card_free(card); 1169 1170 platform_set_drvdata(pdev, NULL); 1171 1172 return 0; 1173 } 1174 1175 static struct platform_driver atmel_ac97c_driver = { 1176 .remove = __devexit_p(atmel_ac97c_remove), 1177 .driver = { 1178 .name = "atmel_ac97c", 1179 }, 1180 .suspend = atmel_ac97c_suspend, 1181 .resume = atmel_ac97c_resume, 1182 }; 1183 1184 static int __init atmel_ac97c_init(void) 1185 { 1186 return platform_driver_probe(&atmel_ac97c_driver, 1187 atmel_ac97c_probe); 1188 } 1189 module_init(atmel_ac97c_init); 1190 1191 static void __exit atmel_ac97c_exit(void) 1192 { 1193 platform_driver_unregister(&atmel_ac97c_driver); 1194 } 1195 module_exit(atmel_ac97c_exit); 1196 1197 MODULE_LICENSE("GPL"); 1198 MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); 1199 MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>"); 1200