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/gpio.h> 37 38 #ifdef CONFIG_ARCH_AT91 39 #include <mach/hardware.h> 40 #endif 41 42 #include "ac97c.h" 43 44 enum { 45 DMA_TX_READY = 0, 46 DMA_RX_READY, 47 DMA_TX_CHAN_PRESENT, 48 DMA_RX_CHAN_PRESENT, 49 }; 50 51 /* Serialize access to opened variable */ 52 static DEFINE_MUTEX(opened_mutex); 53 54 struct atmel_ac97c_dma { 55 struct dma_chan *rx_chan; 56 struct dma_chan *tx_chan; 57 }; 58 59 struct atmel_ac97c { 60 struct clk *pclk; 61 struct platform_device *pdev; 62 struct atmel_ac97c_dma dma; 63 64 struct snd_pcm_substream *playback_substream; 65 struct snd_pcm_substream *capture_substream; 66 struct snd_card *card; 67 struct snd_pcm *pcm; 68 struct snd_ac97 *ac97; 69 struct snd_ac97_bus *ac97_bus; 70 71 u64 cur_format; 72 unsigned int cur_rate; 73 unsigned long flags; 74 int playback_period, capture_period; 75 /* Serialize access to opened variable */ 76 spinlock_t lock; 77 void __iomem *regs; 78 int irq; 79 int opened; 80 int reset_pin; 81 }; 82 83 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data) 84 85 #define ac97c_writel(chip, reg, val) \ 86 __raw_writel((val), (chip)->regs + AC97C_##reg) 87 #define ac97c_readl(chip, reg) \ 88 __raw_readl((chip)->regs + AC97C_##reg) 89 90 /* This function is called by the DMA driver. */ 91 static void atmel_ac97c_dma_playback_period_done(void *arg) 92 { 93 struct atmel_ac97c *chip = arg; 94 snd_pcm_period_elapsed(chip->playback_substream); 95 } 96 97 static void atmel_ac97c_dma_capture_period_done(void *arg) 98 { 99 struct atmel_ac97c *chip = arg; 100 snd_pcm_period_elapsed(chip->capture_substream); 101 } 102 103 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip, 104 struct snd_pcm_substream *substream, 105 enum dma_transfer_direction direction) 106 { 107 struct dma_chan *chan; 108 struct dw_cyclic_desc *cdesc; 109 struct snd_pcm_runtime *runtime = substream->runtime; 110 unsigned long buffer_len, period_len; 111 112 /* 113 * We don't do DMA on "complex" transfers, i.e. with 114 * non-halfword-aligned buffers or lengths. 115 */ 116 if (runtime->dma_addr & 1 || runtime->buffer_size & 1) { 117 dev_dbg(&chip->pdev->dev, "too complex transfer\n"); 118 return -EINVAL; 119 } 120 121 if (direction == DMA_MEM_TO_DEV) 122 chan = chip->dma.tx_chan; 123 else 124 chan = chip->dma.rx_chan; 125 126 buffer_len = frames_to_bytes(runtime, runtime->buffer_size); 127 period_len = frames_to_bytes(runtime, runtime->period_size); 128 129 cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len, 130 period_len, direction); 131 if (IS_ERR(cdesc)) { 132 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n"); 133 return PTR_ERR(cdesc); 134 } 135 136 if (direction == DMA_MEM_TO_DEV) { 137 cdesc->period_callback = atmel_ac97c_dma_playback_period_done; 138 set_bit(DMA_TX_READY, &chip->flags); 139 } else { 140 cdesc->period_callback = atmel_ac97c_dma_capture_period_done; 141 set_bit(DMA_RX_READY, &chip->flags); 142 } 143 144 cdesc->period_callback_param = chip; 145 146 return 0; 147 } 148 149 static struct snd_pcm_hardware atmel_ac97c_hw = { 150 .info = (SNDRV_PCM_INFO_MMAP 151 | SNDRV_PCM_INFO_MMAP_VALID 152 | SNDRV_PCM_INFO_INTERLEAVED 153 | SNDRV_PCM_INFO_BLOCK_TRANSFER 154 | SNDRV_PCM_INFO_JOINT_DUPLEX 155 | SNDRV_PCM_INFO_RESUME 156 | SNDRV_PCM_INFO_PAUSE), 157 .formats = (SNDRV_PCM_FMTBIT_S16_BE 158 | SNDRV_PCM_FMTBIT_S16_LE), 159 .rates = (SNDRV_PCM_RATE_CONTINUOUS), 160 .rate_min = 4000, 161 .rate_max = 48000, 162 .channels_min = 1, 163 .channels_max = 2, 164 .buffer_bytes_max = 2 * 2 * 64 * 2048, 165 .period_bytes_min = 4096, 166 .period_bytes_max = 4096, 167 .periods_min = 6, 168 .periods_max = 64, 169 }; 170 171 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) 172 { 173 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 174 struct snd_pcm_runtime *runtime = substream->runtime; 175 176 mutex_lock(&opened_mutex); 177 chip->opened++; 178 runtime->hw = atmel_ac97c_hw; 179 if (chip->cur_rate) { 180 runtime->hw.rate_min = chip->cur_rate; 181 runtime->hw.rate_max = chip->cur_rate; 182 } 183 if (chip->cur_format) 184 runtime->hw.formats = (1ULL << chip->cur_format); 185 mutex_unlock(&opened_mutex); 186 chip->playback_substream = substream; 187 return 0; 188 } 189 190 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) 191 { 192 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 193 struct snd_pcm_runtime *runtime = substream->runtime; 194 195 mutex_lock(&opened_mutex); 196 chip->opened++; 197 runtime->hw = atmel_ac97c_hw; 198 if (chip->cur_rate) { 199 runtime->hw.rate_min = chip->cur_rate; 200 runtime->hw.rate_max = chip->cur_rate; 201 } 202 if (chip->cur_format) 203 runtime->hw.formats = (1ULL << chip->cur_format); 204 mutex_unlock(&opened_mutex); 205 chip->capture_substream = substream; 206 return 0; 207 } 208 209 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) 210 { 211 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 212 213 mutex_lock(&opened_mutex); 214 chip->opened--; 215 if (!chip->opened) { 216 chip->cur_rate = 0; 217 chip->cur_format = 0; 218 } 219 mutex_unlock(&opened_mutex); 220 221 chip->playback_substream = NULL; 222 223 return 0; 224 } 225 226 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) 227 { 228 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 229 230 mutex_lock(&opened_mutex); 231 chip->opened--; 232 if (!chip->opened) { 233 chip->cur_rate = 0; 234 chip->cur_format = 0; 235 } 236 mutex_unlock(&opened_mutex); 237 238 chip->capture_substream = NULL; 239 240 return 0; 241 } 242 243 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, 244 struct snd_pcm_hw_params *hw_params) 245 { 246 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 247 int retval; 248 249 retval = snd_pcm_lib_malloc_pages(substream, 250 params_buffer_bytes(hw_params)); 251 if (retval < 0) 252 return retval; 253 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 254 if (cpu_is_at32ap7000()) { 255 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 256 if (retval == 1) 257 if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) 258 dw_dma_cyclic_free(chip->dma.tx_chan); 259 } 260 /* Set restrictions to params. */ 261 mutex_lock(&opened_mutex); 262 chip->cur_rate = params_rate(hw_params); 263 chip->cur_format = params_format(hw_params); 264 mutex_unlock(&opened_mutex); 265 266 return retval; 267 } 268 269 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, 270 struct snd_pcm_hw_params *hw_params) 271 { 272 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 273 int retval; 274 275 retval = snd_pcm_lib_malloc_pages(substream, 276 params_buffer_bytes(hw_params)); 277 if (retval < 0) 278 return retval; 279 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 280 if (cpu_is_at32ap7000()) { 281 if (retval < 0) 282 return retval; 283 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 284 if (retval == 1) 285 if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) 286 dw_dma_cyclic_free(chip->dma.rx_chan); 287 } 288 289 /* Set restrictions to params. */ 290 mutex_lock(&opened_mutex); 291 chip->cur_rate = params_rate(hw_params); 292 chip->cur_format = params_format(hw_params); 293 mutex_unlock(&opened_mutex); 294 295 return retval; 296 } 297 298 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream) 299 { 300 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 301 if (cpu_is_at32ap7000()) { 302 if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) 303 dw_dma_cyclic_free(chip->dma.tx_chan); 304 } 305 return snd_pcm_lib_free_pages(substream); 306 } 307 308 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream) 309 { 310 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 311 if (cpu_is_at32ap7000()) { 312 if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) 313 dw_dma_cyclic_free(chip->dma.rx_chan); 314 } 315 return snd_pcm_lib_free_pages(substream); 316 } 317 318 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) 319 { 320 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 321 struct snd_pcm_runtime *runtime = substream->runtime; 322 int block_size = frames_to_bytes(runtime, runtime->period_size); 323 unsigned long word = ac97c_readl(chip, OCA); 324 int retval; 325 326 chip->playback_period = 0; 327 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 328 329 /* assign channels to AC97C channel A */ 330 switch (runtime->channels) { 331 case 1: 332 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 333 break; 334 case 2: 335 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 336 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 337 break; 338 default: 339 /* TODO: support more than two channels */ 340 return -EINVAL; 341 } 342 ac97c_writel(chip, OCA, word); 343 344 /* configure sample format and size */ 345 word = ac97c_readl(chip, CAMR); 346 if (chip->opened <= 1) 347 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 348 else 349 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 350 351 switch (runtime->format) { 352 case SNDRV_PCM_FORMAT_S16_LE: 353 if (cpu_is_at32ap7000()) 354 word |= AC97C_CMR_CEM_LITTLE; 355 break; 356 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 357 word &= ~(AC97C_CMR_CEM_LITTLE); 358 break; 359 default: 360 word = ac97c_readl(chip, OCA); 361 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 362 ac97c_writel(chip, OCA, word); 363 return -EINVAL; 364 } 365 366 /* Enable underrun interrupt on channel A */ 367 word |= AC97C_CSR_UNRUN; 368 369 ac97c_writel(chip, CAMR, word); 370 371 /* Enable channel A event interrupt */ 372 word = ac97c_readl(chip, IMR); 373 word |= AC97C_SR_CAEVT; 374 ac97c_writel(chip, IER, word); 375 376 /* set variable rate if needed */ 377 if (runtime->rate != 48000) { 378 word = ac97c_readl(chip, MR); 379 word |= AC97C_MR_VRA; 380 ac97c_writel(chip, MR, word); 381 } else { 382 word = ac97c_readl(chip, MR); 383 word &= ~(AC97C_MR_VRA); 384 ac97c_writel(chip, MR, word); 385 } 386 387 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, 388 runtime->rate); 389 if (retval) 390 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 391 runtime->rate); 392 393 if (cpu_is_at32ap7000()) { 394 if (!test_bit(DMA_TX_READY, &chip->flags)) 395 retval = atmel_ac97c_prepare_dma(chip, substream, 396 DMA_MEM_TO_DEV); 397 } else { 398 /* Initialize and start the PDC */ 399 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR); 400 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR); 401 writel(runtime->dma_addr + block_size, 402 chip->regs + ATMEL_PDC_TNPR); 403 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR); 404 } 405 406 return retval; 407 } 408 409 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) 410 { 411 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 412 struct snd_pcm_runtime *runtime = substream->runtime; 413 int block_size = frames_to_bytes(runtime, runtime->period_size); 414 unsigned long word = ac97c_readl(chip, ICA); 415 int retval; 416 417 chip->capture_period = 0; 418 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 419 420 /* assign channels to AC97C channel A */ 421 switch (runtime->channels) { 422 case 1: 423 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 424 break; 425 case 2: 426 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 427 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 428 break; 429 default: 430 /* TODO: support more than two channels */ 431 return -EINVAL; 432 } 433 ac97c_writel(chip, ICA, word); 434 435 /* configure sample format and size */ 436 word = ac97c_readl(chip, CAMR); 437 if (chip->opened <= 1) 438 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 439 else 440 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 441 442 switch (runtime->format) { 443 case SNDRV_PCM_FORMAT_S16_LE: 444 if (cpu_is_at32ap7000()) 445 word |= AC97C_CMR_CEM_LITTLE; 446 break; 447 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 448 word &= ~(AC97C_CMR_CEM_LITTLE); 449 break; 450 default: 451 word = ac97c_readl(chip, ICA); 452 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 453 ac97c_writel(chip, ICA, word); 454 return -EINVAL; 455 } 456 457 /* Enable overrun interrupt on channel A */ 458 word |= AC97C_CSR_OVRUN; 459 460 ac97c_writel(chip, CAMR, word); 461 462 /* Enable channel A event interrupt */ 463 word = ac97c_readl(chip, IMR); 464 word |= AC97C_SR_CAEVT; 465 ac97c_writel(chip, IER, word); 466 467 /* set variable rate if needed */ 468 if (runtime->rate != 48000) { 469 word = ac97c_readl(chip, MR); 470 word |= AC97C_MR_VRA; 471 ac97c_writel(chip, MR, word); 472 } else { 473 word = ac97c_readl(chip, MR); 474 word &= ~(AC97C_MR_VRA); 475 ac97c_writel(chip, MR, word); 476 } 477 478 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, 479 runtime->rate); 480 if (retval) 481 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 482 runtime->rate); 483 484 if (cpu_is_at32ap7000()) { 485 if (!test_bit(DMA_RX_READY, &chip->flags)) 486 retval = atmel_ac97c_prepare_dma(chip, substream, 487 DMA_DEV_TO_MEM); 488 } else { 489 /* Initialize and start the PDC */ 490 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR); 491 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR); 492 writel(runtime->dma_addr + block_size, 493 chip->regs + ATMEL_PDC_RNPR); 494 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR); 495 } 496 497 return retval; 498 } 499 500 static int 501 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) 502 { 503 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 504 unsigned long camr, ptcr = 0; 505 int retval = 0; 506 507 camr = ac97c_readl(chip, CAMR); 508 509 switch (cmd) { 510 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 511 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 512 case SNDRV_PCM_TRIGGER_START: 513 if (cpu_is_at32ap7000()) { 514 retval = dw_dma_cyclic_start(chip->dma.tx_chan); 515 if (retval) 516 goto out; 517 } else { 518 ptcr = ATMEL_PDC_TXTEN; 519 } 520 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX; 521 break; 522 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 523 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 524 case SNDRV_PCM_TRIGGER_STOP: 525 if (cpu_is_at32ap7000()) 526 dw_dma_cyclic_stop(chip->dma.tx_chan); 527 else 528 ptcr |= ATMEL_PDC_TXTDIS; 529 if (chip->opened <= 1) 530 camr &= ~AC97C_CMR_CENA; 531 break; 532 default: 533 retval = -EINVAL; 534 goto out; 535 } 536 537 ac97c_writel(chip, CAMR, camr); 538 if (!cpu_is_at32ap7000()) 539 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 540 out: 541 return retval; 542 } 543 544 static int 545 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) 546 { 547 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 548 unsigned long camr, ptcr = 0; 549 int retval = 0; 550 551 camr = ac97c_readl(chip, CAMR); 552 ptcr = readl(chip->regs + ATMEL_PDC_PTSR); 553 554 switch (cmd) { 555 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 556 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 557 case SNDRV_PCM_TRIGGER_START: 558 if (cpu_is_at32ap7000()) { 559 retval = dw_dma_cyclic_start(chip->dma.rx_chan); 560 if (retval) 561 goto out; 562 } else { 563 ptcr = ATMEL_PDC_RXTEN; 564 } 565 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX; 566 break; 567 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 568 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 569 case SNDRV_PCM_TRIGGER_STOP: 570 if (cpu_is_at32ap7000()) 571 dw_dma_cyclic_stop(chip->dma.rx_chan); 572 else 573 ptcr |= (ATMEL_PDC_RXTDIS); 574 if (chip->opened <= 1) 575 camr &= ~AC97C_CMR_CENA; 576 break; 577 default: 578 retval = -EINVAL; 579 break; 580 } 581 582 ac97c_writel(chip, CAMR, camr); 583 if (!cpu_is_at32ap7000()) 584 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 585 out: 586 return retval; 587 } 588 589 static snd_pcm_uframes_t 590 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) 591 { 592 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 593 struct snd_pcm_runtime *runtime = substream->runtime; 594 snd_pcm_uframes_t frames; 595 unsigned long bytes; 596 597 if (cpu_is_at32ap7000()) 598 bytes = dw_dma_get_src_addr(chip->dma.tx_chan); 599 else 600 bytes = readl(chip->regs + ATMEL_PDC_TPR); 601 bytes -= runtime->dma_addr; 602 603 frames = bytes_to_frames(runtime, bytes); 604 if (frames >= runtime->buffer_size) 605 frames -= runtime->buffer_size; 606 return frames; 607 } 608 609 static snd_pcm_uframes_t 610 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) 611 { 612 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 613 struct snd_pcm_runtime *runtime = substream->runtime; 614 snd_pcm_uframes_t frames; 615 unsigned long bytes; 616 617 if (cpu_is_at32ap7000()) 618 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan); 619 else 620 bytes = readl(chip->regs + ATMEL_PDC_RPR); 621 bytes -= runtime->dma_addr; 622 623 frames = bytes_to_frames(runtime, bytes); 624 if (frames >= runtime->buffer_size) 625 frames -= runtime->buffer_size; 626 return frames; 627 } 628 629 static struct snd_pcm_ops atmel_ac97_playback_ops = { 630 .open = atmel_ac97c_playback_open, 631 .close = atmel_ac97c_playback_close, 632 .ioctl = snd_pcm_lib_ioctl, 633 .hw_params = atmel_ac97c_playback_hw_params, 634 .hw_free = atmel_ac97c_playback_hw_free, 635 .prepare = atmel_ac97c_playback_prepare, 636 .trigger = atmel_ac97c_playback_trigger, 637 .pointer = atmel_ac97c_playback_pointer, 638 }; 639 640 static struct snd_pcm_ops atmel_ac97_capture_ops = { 641 .open = atmel_ac97c_capture_open, 642 .close = atmel_ac97c_capture_close, 643 .ioctl = snd_pcm_lib_ioctl, 644 .hw_params = atmel_ac97c_capture_hw_params, 645 .hw_free = atmel_ac97c_capture_hw_free, 646 .prepare = atmel_ac97c_capture_prepare, 647 .trigger = atmel_ac97c_capture_trigger, 648 .pointer = atmel_ac97c_capture_pointer, 649 }; 650 651 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) 652 { 653 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev; 654 irqreturn_t retval = IRQ_NONE; 655 u32 sr = ac97c_readl(chip, SR); 656 u32 casr = ac97c_readl(chip, CASR); 657 u32 cosr = ac97c_readl(chip, COSR); 658 u32 camr = ac97c_readl(chip, CAMR); 659 660 if (sr & AC97C_SR_CAEVT) { 661 struct snd_pcm_runtime *runtime; 662 int offset, next_period, block_size; 663 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n", 664 casr & AC97C_CSR_OVRUN ? " OVRUN" : "", 665 casr & AC97C_CSR_RXRDY ? " RXRDY" : "", 666 casr & AC97C_CSR_UNRUN ? " UNRUN" : "", 667 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 668 casr & AC97C_CSR_TXRDY ? " TXRDY" : "", 669 !casr ? " NONE" : ""); 670 if (!cpu_is_at32ap7000()) { 671 if ((casr & camr) & AC97C_CSR_ENDTX) { 672 runtime = chip->playback_substream->runtime; 673 block_size = frames_to_bytes(runtime, 674 runtime->period_size); 675 chip->playback_period++; 676 677 if (chip->playback_period == runtime->periods) 678 chip->playback_period = 0; 679 next_period = chip->playback_period + 1; 680 if (next_period == runtime->periods) 681 next_period = 0; 682 683 offset = block_size * next_period; 684 685 writel(runtime->dma_addr + offset, 686 chip->regs + ATMEL_PDC_TNPR); 687 writel(block_size / 2, 688 chip->regs + ATMEL_PDC_TNCR); 689 690 snd_pcm_period_elapsed( 691 chip->playback_substream); 692 } 693 if ((casr & camr) & AC97C_CSR_ENDRX) { 694 runtime = chip->capture_substream->runtime; 695 block_size = frames_to_bytes(runtime, 696 runtime->period_size); 697 chip->capture_period++; 698 699 if (chip->capture_period == runtime->periods) 700 chip->capture_period = 0; 701 next_period = chip->capture_period + 1; 702 if (next_period == runtime->periods) 703 next_period = 0; 704 705 offset = block_size * next_period; 706 707 writel(runtime->dma_addr + offset, 708 chip->regs + ATMEL_PDC_RNPR); 709 writel(block_size / 2, 710 chip->regs + ATMEL_PDC_RNCR); 711 snd_pcm_period_elapsed(chip->capture_substream); 712 } 713 } 714 retval = IRQ_HANDLED; 715 } 716 717 if (sr & AC97C_SR_COEVT) { 718 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n", 719 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "", 720 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "", 721 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 722 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "", 723 !cosr ? " NONE" : ""); 724 retval = IRQ_HANDLED; 725 } 726 727 if (retval == IRQ_NONE) { 728 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x " 729 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr); 730 } 731 732 return retval; 733 } 734 735 static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = { 736 /* Playback */ 737 { 738 .exclusive = 1, 739 .r = { { 740 .slots = ((1 << AC97_SLOT_PCM_LEFT) 741 | (1 << AC97_SLOT_PCM_RIGHT)), 742 } }, 743 }, 744 /* PCM in */ 745 { 746 .stream = 1, 747 .exclusive = 1, 748 .r = { { 749 .slots = ((1 << AC97_SLOT_PCM_LEFT) 750 | (1 << AC97_SLOT_PCM_RIGHT)), 751 } } 752 }, 753 /* Mic in */ 754 { 755 .stream = 1, 756 .exclusive = 1, 757 .r = { { 758 .slots = (1<<AC97_SLOT_MIC), 759 } } 760 }, 761 }; 762 763 static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip) 764 { 765 struct snd_pcm *pcm; 766 struct snd_pcm_hardware hw = atmel_ac97c_hw; 767 int capture, playback, retval, err; 768 769 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 770 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 771 772 if (!cpu_is_at32ap7000()) { 773 err = snd_ac97_pcm_assign(chip->ac97_bus, 774 ARRAY_SIZE(at91_ac97_pcm_defs), 775 at91_ac97_pcm_defs); 776 if (err) 777 return err; 778 } 779 retval = snd_pcm_new(chip->card, chip->card->shortname, 780 chip->pdev->id, playback, capture, &pcm); 781 if (retval) 782 return retval; 783 784 if (capture) 785 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 786 &atmel_ac97_capture_ops); 787 if (playback) 788 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 789 &atmel_ac97_playback_ops); 790 791 retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, 792 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min, 793 hw.buffer_bytes_max); 794 if (retval) 795 return retval; 796 797 pcm->private_data = chip; 798 pcm->info_flags = 0; 799 strcpy(pcm->name, chip->card->shortname); 800 chip->pcm = pcm; 801 802 return 0; 803 } 804 805 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip) 806 { 807 struct snd_ac97_template template; 808 memset(&template, 0, sizeof(template)); 809 template.private_data = chip; 810 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97); 811 } 812 813 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg, 814 unsigned short val) 815 { 816 struct atmel_ac97c *chip = get_chip(ac97); 817 unsigned long word; 818 int timeout = 40; 819 820 word = (reg & 0x7f) << 16 | val; 821 822 do { 823 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) { 824 ac97c_writel(chip, COTHR, word); 825 return; 826 } 827 udelay(1); 828 } while (--timeout); 829 830 dev_dbg(&chip->pdev->dev, "codec write timeout\n"); 831 } 832 833 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97, 834 unsigned short reg) 835 { 836 struct atmel_ac97c *chip = get_chip(ac97); 837 unsigned long word; 838 int timeout = 40; 839 int write = 10; 840 841 word = (0x80 | (reg & 0x7f)) << 16; 842 843 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) 844 ac97c_readl(chip, CORHR); 845 846 retry_write: 847 timeout = 40; 848 849 do { 850 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) { 851 ac97c_writel(chip, COTHR, word); 852 goto read_reg; 853 } 854 udelay(10); 855 } while (--timeout); 856 857 if (!--write) 858 goto timed_out; 859 goto retry_write; 860 861 read_reg: 862 do { 863 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) { 864 unsigned short val = ac97c_readl(chip, CORHR); 865 return val; 866 } 867 udelay(10); 868 } while (--timeout); 869 870 if (!--write) 871 goto timed_out; 872 goto retry_write; 873 874 timed_out: 875 dev_dbg(&chip->pdev->dev, "codec read timeout\n"); 876 return 0xffff; 877 } 878 879 static bool filter(struct dma_chan *chan, void *slave) 880 { 881 struct dw_dma_slave *dws = slave; 882 883 if (dws->dma_dev == chan->device->dev) { 884 chan->private = dws; 885 return true; 886 } else 887 return false; 888 } 889 890 static void atmel_ac97c_reset(struct atmel_ac97c *chip) 891 { 892 ac97c_writel(chip, MR, 0); 893 ac97c_writel(chip, MR, AC97C_MR_ENA); 894 ac97c_writel(chip, CAMR, 0); 895 ac97c_writel(chip, COMR, 0); 896 897 if (gpio_is_valid(chip->reset_pin)) { 898 gpio_set_value(chip->reset_pin, 0); 899 /* AC97 v2.2 specifications says minimum 1 us. */ 900 udelay(2); 901 gpio_set_value(chip->reset_pin, 1); 902 } else { 903 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA); 904 udelay(2); 905 ac97c_writel(chip, MR, AC97C_MR_ENA); 906 } 907 } 908 909 static int __devinit atmel_ac97c_probe(struct platform_device *pdev) 910 { 911 struct snd_card *card; 912 struct atmel_ac97c *chip; 913 struct resource *regs; 914 struct ac97c_platform_data *pdata; 915 struct clk *pclk; 916 static struct snd_ac97_bus_ops ops = { 917 .write = atmel_ac97c_write, 918 .read = atmel_ac97c_read, 919 }; 920 int retval; 921 int irq; 922 923 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 924 if (!regs) { 925 dev_dbg(&pdev->dev, "no memory resource\n"); 926 return -ENXIO; 927 } 928 929 pdata = pdev->dev.platform_data; 930 if (!pdata) { 931 dev_dbg(&pdev->dev, "no platform data\n"); 932 return -ENXIO; 933 } 934 935 irq = platform_get_irq(pdev, 0); 936 if (irq < 0) { 937 dev_dbg(&pdev->dev, "could not get irq\n"); 938 return -ENXIO; 939 } 940 941 if (cpu_is_at32ap7000()) { 942 pclk = clk_get(&pdev->dev, "pclk"); 943 } else { 944 pclk = clk_get(&pdev->dev, "ac97_clk"); 945 } 946 947 if (IS_ERR(pclk)) { 948 dev_dbg(&pdev->dev, "no peripheral clock\n"); 949 return PTR_ERR(pclk); 950 } 951 clk_enable(pclk); 952 953 retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, 954 THIS_MODULE, sizeof(struct atmel_ac97c), &card); 955 if (retval) { 956 dev_dbg(&pdev->dev, "could not create sound card device\n"); 957 goto err_snd_card_new; 958 } 959 960 chip = get_chip(card); 961 962 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip); 963 if (retval) { 964 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq); 965 goto err_request_irq; 966 } 967 chip->irq = irq; 968 969 spin_lock_init(&chip->lock); 970 971 strcpy(card->driver, "Atmel AC97C"); 972 strcpy(card->shortname, "Atmel AC97C"); 973 sprintf(card->longname, "Atmel AC97 controller"); 974 975 chip->card = card; 976 chip->pclk = pclk; 977 chip->pdev = pdev; 978 chip->regs = ioremap(regs->start, resource_size(regs)); 979 980 if (!chip->regs) { 981 dev_dbg(&pdev->dev, "could not remap register memory\n"); 982 goto err_ioremap; 983 } 984 985 if (gpio_is_valid(pdata->reset_pin)) { 986 if (gpio_request(pdata->reset_pin, "reset_pin")) { 987 dev_dbg(&pdev->dev, "reset pin not available\n"); 988 chip->reset_pin = -ENODEV; 989 } else { 990 gpio_direction_output(pdata->reset_pin, 1); 991 chip->reset_pin = pdata->reset_pin; 992 } 993 } 994 995 snd_card_set_dev(card, &pdev->dev); 996 997 atmel_ac97c_reset(chip); 998 999 /* Enable overrun interrupt from codec channel */ 1000 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN); 1001 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT); 1002 1003 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus); 1004 if (retval) { 1005 dev_dbg(&pdev->dev, "could not register on ac97 bus\n"); 1006 goto err_ac97_bus; 1007 } 1008 1009 retval = atmel_ac97c_mixer_new(chip); 1010 if (retval) { 1011 dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); 1012 goto err_ac97_bus; 1013 } 1014 1015 if (cpu_is_at32ap7000()) { 1016 if (pdata->rx_dws.dma_dev) { 1017 struct dw_dma_slave *dws = &pdata->rx_dws; 1018 dma_cap_mask_t mask; 1019 1020 dws->rx_reg = regs->start + AC97C_CARHR + 2; 1021 1022 dma_cap_zero(mask); 1023 dma_cap_set(DMA_SLAVE, mask); 1024 1025 chip->dma.rx_chan = dma_request_channel(mask, filter, 1026 dws); 1027 1028 dev_info(&chip->pdev->dev, "using %s for DMA RX\n", 1029 dev_name(&chip->dma.rx_chan->dev->device)); 1030 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1031 } 1032 1033 if (pdata->tx_dws.dma_dev) { 1034 struct dw_dma_slave *dws = &pdata->tx_dws; 1035 dma_cap_mask_t mask; 1036 1037 dws->tx_reg = regs->start + AC97C_CATHR + 2; 1038 1039 dma_cap_zero(mask); 1040 dma_cap_set(DMA_SLAVE, mask); 1041 1042 chip->dma.tx_chan = dma_request_channel(mask, filter, 1043 dws); 1044 1045 dev_info(&chip->pdev->dev, "using %s for DMA TX\n", 1046 dev_name(&chip->dma.tx_chan->dev->device)); 1047 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1048 } 1049 1050 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) && 1051 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) { 1052 dev_dbg(&pdev->dev, "DMA not available\n"); 1053 retval = -ENODEV; 1054 goto err_dma; 1055 } 1056 } else { 1057 /* Just pretend that we have DMA channel(for at91 i is actually 1058 * the PDC) */ 1059 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1060 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1061 } 1062 1063 retval = atmel_ac97c_pcm_new(chip); 1064 if (retval) { 1065 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n"); 1066 goto err_dma; 1067 } 1068 1069 retval = snd_card_register(card); 1070 if (retval) { 1071 dev_dbg(&pdev->dev, "could not register sound card\n"); 1072 goto err_dma; 1073 } 1074 1075 platform_set_drvdata(pdev, card); 1076 1077 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n", 1078 chip->regs, irq); 1079 1080 return 0; 1081 1082 err_dma: 1083 if (cpu_is_at32ap7000()) { 1084 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) 1085 dma_release_channel(chip->dma.rx_chan); 1086 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) 1087 dma_release_channel(chip->dma.tx_chan); 1088 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1089 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1090 chip->dma.rx_chan = NULL; 1091 chip->dma.tx_chan = NULL; 1092 } 1093 err_ac97_bus: 1094 snd_card_set_dev(card, NULL); 1095 1096 if (gpio_is_valid(chip->reset_pin)) 1097 gpio_free(chip->reset_pin); 1098 1099 iounmap(chip->regs); 1100 err_ioremap: 1101 free_irq(irq, chip); 1102 err_request_irq: 1103 snd_card_free(card); 1104 err_snd_card_new: 1105 clk_disable(pclk); 1106 clk_put(pclk); 1107 return retval; 1108 } 1109 1110 #ifdef CONFIG_PM 1111 static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg) 1112 { 1113 struct snd_card *card = platform_get_drvdata(pdev); 1114 struct atmel_ac97c *chip = card->private_data; 1115 1116 if (cpu_is_at32ap7000()) { 1117 if (test_bit(DMA_RX_READY, &chip->flags)) 1118 dw_dma_cyclic_stop(chip->dma.rx_chan); 1119 if (test_bit(DMA_TX_READY, &chip->flags)) 1120 dw_dma_cyclic_stop(chip->dma.tx_chan); 1121 } 1122 clk_disable(chip->pclk); 1123 1124 return 0; 1125 } 1126 1127 static int atmel_ac97c_resume(struct platform_device *pdev) 1128 { 1129 struct snd_card *card = platform_get_drvdata(pdev); 1130 struct atmel_ac97c *chip = card->private_data; 1131 1132 clk_enable(chip->pclk); 1133 if (cpu_is_at32ap7000()) { 1134 if (test_bit(DMA_RX_READY, &chip->flags)) 1135 dw_dma_cyclic_start(chip->dma.rx_chan); 1136 if (test_bit(DMA_TX_READY, &chip->flags)) 1137 dw_dma_cyclic_start(chip->dma.tx_chan); 1138 } 1139 return 0; 1140 } 1141 #else 1142 #define atmel_ac97c_suspend NULL 1143 #define atmel_ac97c_resume NULL 1144 #endif 1145 1146 static int __devexit atmel_ac97c_remove(struct platform_device *pdev) 1147 { 1148 struct snd_card *card = platform_get_drvdata(pdev); 1149 struct atmel_ac97c *chip = get_chip(card); 1150 1151 if (gpio_is_valid(chip->reset_pin)) 1152 gpio_free(chip->reset_pin); 1153 1154 ac97c_writel(chip, CAMR, 0); 1155 ac97c_writel(chip, COMR, 0); 1156 ac97c_writel(chip, MR, 0); 1157 1158 clk_disable(chip->pclk); 1159 clk_put(chip->pclk); 1160 iounmap(chip->regs); 1161 free_irq(chip->irq, chip); 1162 1163 if (cpu_is_at32ap7000()) { 1164 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) 1165 dma_release_channel(chip->dma.rx_chan); 1166 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) 1167 dma_release_channel(chip->dma.tx_chan); 1168 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1169 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1170 chip->dma.rx_chan = NULL; 1171 chip->dma.tx_chan = NULL; 1172 } 1173 1174 snd_card_set_dev(card, NULL); 1175 snd_card_free(card); 1176 1177 platform_set_drvdata(pdev, NULL); 1178 1179 return 0; 1180 } 1181 1182 static struct platform_driver atmel_ac97c_driver = { 1183 .remove = __devexit_p(atmel_ac97c_remove), 1184 .driver = { 1185 .name = "atmel_ac97c", 1186 }, 1187 .suspend = atmel_ac97c_suspend, 1188 .resume = atmel_ac97c_resume, 1189 }; 1190 1191 static int __init atmel_ac97c_init(void) 1192 { 1193 return platform_driver_probe(&atmel_ac97c_driver, 1194 atmel_ac97c_probe); 1195 } 1196 module_init(atmel_ac97c_init); 1197 1198 static void __exit atmel_ac97c_exit(void) 1199 { 1200 platform_driver_unregister(&atmel_ac97c_driver); 1201 } 1202 module_exit(atmel_ac97c_exit); 1203 1204 MODULE_LICENSE("GPL"); 1205 MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); 1206 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); 1207