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 26 #include <sound/core.h> 27 #include <sound/initval.h> 28 #include <sound/pcm.h> 29 #include <sound/pcm_params.h> 30 #include <sound/ac97_codec.h> 31 #include <sound/atmel-ac97c.h> 32 #include <sound/memalloc.h> 33 34 #include <linux/dw_dmac.h> 35 36 #include <mach/cpu.h> 37 #include <mach/gpio.h> 38 39 #ifdef CONFIG_ARCH_AT91 40 #include <mach/hardware.h> 41 #endif 42 43 #include "ac97c.h" 44 45 enum { 46 DMA_TX_READY = 0, 47 DMA_RX_READY, 48 DMA_TX_CHAN_PRESENT, 49 DMA_RX_CHAN_PRESENT, 50 }; 51 52 /* Serialize access to opened variable */ 53 static DEFINE_MUTEX(opened_mutex); 54 55 struct atmel_ac97c_dma { 56 struct dma_chan *rx_chan; 57 struct dma_chan *tx_chan; 58 }; 59 60 struct atmel_ac97c { 61 struct clk *pclk; 62 struct platform_device *pdev; 63 struct atmel_ac97c_dma dma; 64 65 struct snd_pcm_substream *playback_substream; 66 struct snd_pcm_substream *capture_substream; 67 struct snd_card *card; 68 struct snd_pcm *pcm; 69 struct snd_ac97 *ac97; 70 struct snd_ac97_bus *ac97_bus; 71 72 u64 cur_format; 73 unsigned int cur_rate; 74 unsigned long flags; 75 int playback_period, capture_period; 76 /* Serialize access to opened variable */ 77 spinlock_t lock; 78 void __iomem *regs; 79 int irq; 80 int opened; 81 int reset_pin; 82 }; 83 84 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data) 85 86 #define ac97c_writel(chip, reg, val) \ 87 __raw_writel((val), (chip)->regs + AC97C_##reg) 88 #define ac97c_readl(chip, reg) \ 89 __raw_readl((chip)->regs + AC97C_##reg) 90 91 /* This function is called by the DMA driver. */ 92 static void atmel_ac97c_dma_playback_period_done(void *arg) 93 { 94 struct atmel_ac97c *chip = arg; 95 snd_pcm_period_elapsed(chip->playback_substream); 96 } 97 98 static void atmel_ac97c_dma_capture_period_done(void *arg) 99 { 100 struct atmel_ac97c *chip = arg; 101 snd_pcm_period_elapsed(chip->capture_substream); 102 } 103 104 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip, 105 struct snd_pcm_substream *substream, 106 enum dma_transfer_direction direction) 107 { 108 struct dma_chan *chan; 109 struct dw_cyclic_desc *cdesc; 110 struct snd_pcm_runtime *runtime = substream->runtime; 111 unsigned long buffer_len, period_len; 112 113 /* 114 * We don't do DMA on "complex" transfers, i.e. with 115 * non-halfword-aligned buffers or lengths. 116 */ 117 if (runtime->dma_addr & 1 || runtime->buffer_size & 1) { 118 dev_dbg(&chip->pdev->dev, "too complex transfer\n"); 119 return -EINVAL; 120 } 121 122 if (direction == DMA_MEM_TO_DEV) 123 chan = chip->dma.tx_chan; 124 else 125 chan = chip->dma.rx_chan; 126 127 buffer_len = frames_to_bytes(runtime, runtime->buffer_size); 128 period_len = frames_to_bytes(runtime, runtime->period_size); 129 130 cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len, 131 period_len, direction); 132 if (IS_ERR(cdesc)) { 133 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n"); 134 return PTR_ERR(cdesc); 135 } 136 137 if (direction == DMA_MEM_TO_DEV) { 138 cdesc->period_callback = atmel_ac97c_dma_playback_period_done; 139 set_bit(DMA_TX_READY, &chip->flags); 140 } else { 141 cdesc->period_callback = atmel_ac97c_dma_capture_period_done; 142 set_bit(DMA_RX_READY, &chip->flags); 143 } 144 145 cdesc->period_callback_param = chip; 146 147 return 0; 148 } 149 150 static struct snd_pcm_hardware atmel_ac97c_hw = { 151 .info = (SNDRV_PCM_INFO_MMAP 152 | SNDRV_PCM_INFO_MMAP_VALID 153 | SNDRV_PCM_INFO_INTERLEAVED 154 | SNDRV_PCM_INFO_BLOCK_TRANSFER 155 | SNDRV_PCM_INFO_JOINT_DUPLEX 156 | SNDRV_PCM_INFO_RESUME 157 | SNDRV_PCM_INFO_PAUSE), 158 .formats = (SNDRV_PCM_FMTBIT_S16_BE 159 | SNDRV_PCM_FMTBIT_S16_LE), 160 .rates = (SNDRV_PCM_RATE_CONTINUOUS), 161 .rate_min = 4000, 162 .rate_max = 48000, 163 .channels_min = 1, 164 .channels_max = 2, 165 .buffer_bytes_max = 2 * 2 * 64 * 2048, 166 .period_bytes_min = 4096, 167 .period_bytes_max = 4096, 168 .periods_min = 6, 169 .periods_max = 64, 170 }; 171 172 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) 173 { 174 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 175 struct snd_pcm_runtime *runtime = substream->runtime; 176 177 mutex_lock(&opened_mutex); 178 chip->opened++; 179 runtime->hw = atmel_ac97c_hw; 180 if (chip->cur_rate) { 181 runtime->hw.rate_min = chip->cur_rate; 182 runtime->hw.rate_max = chip->cur_rate; 183 } 184 if (chip->cur_format) 185 runtime->hw.formats = (1ULL << chip->cur_format); 186 mutex_unlock(&opened_mutex); 187 chip->playback_substream = substream; 188 return 0; 189 } 190 191 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) 192 { 193 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 194 struct snd_pcm_runtime *runtime = substream->runtime; 195 196 mutex_lock(&opened_mutex); 197 chip->opened++; 198 runtime->hw = atmel_ac97c_hw; 199 if (chip->cur_rate) { 200 runtime->hw.rate_min = chip->cur_rate; 201 runtime->hw.rate_max = chip->cur_rate; 202 } 203 if (chip->cur_format) 204 runtime->hw.formats = (1ULL << chip->cur_format); 205 mutex_unlock(&opened_mutex); 206 chip->capture_substream = substream; 207 return 0; 208 } 209 210 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) 211 { 212 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 213 214 mutex_lock(&opened_mutex); 215 chip->opened--; 216 if (!chip->opened) { 217 chip->cur_rate = 0; 218 chip->cur_format = 0; 219 } 220 mutex_unlock(&opened_mutex); 221 222 chip->playback_substream = NULL; 223 224 return 0; 225 } 226 227 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) 228 { 229 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 230 231 mutex_lock(&opened_mutex); 232 chip->opened--; 233 if (!chip->opened) { 234 chip->cur_rate = 0; 235 chip->cur_format = 0; 236 } 237 mutex_unlock(&opened_mutex); 238 239 chip->capture_substream = NULL; 240 241 return 0; 242 } 243 244 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, 245 struct snd_pcm_hw_params *hw_params) 246 { 247 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 248 int retval; 249 250 retval = snd_pcm_lib_malloc_pages(substream, 251 params_buffer_bytes(hw_params)); 252 if (retval < 0) 253 return retval; 254 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 255 if (cpu_is_at32ap7000()) { 256 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 257 if (retval == 1) 258 if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) 259 dw_dma_cyclic_free(chip->dma.tx_chan); 260 } 261 /* Set restrictions to params. */ 262 mutex_lock(&opened_mutex); 263 chip->cur_rate = params_rate(hw_params); 264 chip->cur_format = params_format(hw_params); 265 mutex_unlock(&opened_mutex); 266 267 return retval; 268 } 269 270 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, 271 struct snd_pcm_hw_params *hw_params) 272 { 273 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 274 int retval; 275 276 retval = snd_pcm_lib_malloc_pages(substream, 277 params_buffer_bytes(hw_params)); 278 if (retval < 0) 279 return retval; 280 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ 281 if (cpu_is_at32ap7000() && retval == 1) 282 if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) 283 dw_dma_cyclic_free(chip->dma.rx_chan); 284 285 /* Set restrictions to params. */ 286 mutex_lock(&opened_mutex); 287 chip->cur_rate = params_rate(hw_params); 288 chip->cur_format = params_format(hw_params); 289 mutex_unlock(&opened_mutex); 290 291 return retval; 292 } 293 294 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream) 295 { 296 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 297 if (cpu_is_at32ap7000()) { 298 if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) 299 dw_dma_cyclic_free(chip->dma.tx_chan); 300 } 301 return snd_pcm_lib_free_pages(substream); 302 } 303 304 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream) 305 { 306 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 307 if (cpu_is_at32ap7000()) { 308 if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) 309 dw_dma_cyclic_free(chip->dma.rx_chan); 310 } 311 return snd_pcm_lib_free_pages(substream); 312 } 313 314 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) 315 { 316 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 317 struct snd_pcm_runtime *runtime = substream->runtime; 318 int block_size = frames_to_bytes(runtime, runtime->period_size); 319 unsigned long word = ac97c_readl(chip, OCA); 320 int retval; 321 322 chip->playback_period = 0; 323 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 324 325 /* assign channels to AC97C channel A */ 326 switch (runtime->channels) { 327 case 1: 328 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 329 break; 330 case 2: 331 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 332 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 333 break; 334 default: 335 /* TODO: support more than two channels */ 336 return -EINVAL; 337 } 338 ac97c_writel(chip, OCA, word); 339 340 /* configure sample format and size */ 341 word = ac97c_readl(chip, CAMR); 342 if (chip->opened <= 1) 343 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 344 else 345 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 346 347 switch (runtime->format) { 348 case SNDRV_PCM_FORMAT_S16_LE: 349 if (cpu_is_at32ap7000()) 350 word |= AC97C_CMR_CEM_LITTLE; 351 break; 352 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 353 word &= ~(AC97C_CMR_CEM_LITTLE); 354 break; 355 default: 356 word = ac97c_readl(chip, OCA); 357 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 358 ac97c_writel(chip, OCA, word); 359 return -EINVAL; 360 } 361 362 /* Enable underrun interrupt on channel A */ 363 word |= AC97C_CSR_UNRUN; 364 365 ac97c_writel(chip, CAMR, word); 366 367 /* Enable channel A event interrupt */ 368 word = ac97c_readl(chip, IMR); 369 word |= AC97C_SR_CAEVT; 370 ac97c_writel(chip, IER, word); 371 372 /* set variable rate if needed */ 373 if (runtime->rate != 48000) { 374 word = ac97c_readl(chip, MR); 375 word |= AC97C_MR_VRA; 376 ac97c_writel(chip, MR, word); 377 } else { 378 word = ac97c_readl(chip, MR); 379 word &= ~(AC97C_MR_VRA); 380 ac97c_writel(chip, MR, word); 381 } 382 383 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, 384 runtime->rate); 385 if (retval) 386 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 387 runtime->rate); 388 389 if (cpu_is_at32ap7000()) { 390 if (!test_bit(DMA_TX_READY, &chip->flags)) 391 retval = atmel_ac97c_prepare_dma(chip, substream, 392 DMA_MEM_TO_DEV); 393 } else { 394 /* Initialize and start the PDC */ 395 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR); 396 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR); 397 writel(runtime->dma_addr + block_size, 398 chip->regs + ATMEL_PDC_TNPR); 399 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR); 400 } 401 402 return retval; 403 } 404 405 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) 406 { 407 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 408 struct snd_pcm_runtime *runtime = substream->runtime; 409 int block_size = frames_to_bytes(runtime, runtime->period_size); 410 unsigned long word = ac97c_readl(chip, ICA); 411 int retval; 412 413 chip->capture_period = 0; 414 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 415 416 /* assign channels to AC97C channel A */ 417 switch (runtime->channels) { 418 case 1: 419 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 420 break; 421 case 2: 422 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 423 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 424 break; 425 default: 426 /* TODO: support more than two channels */ 427 return -EINVAL; 428 } 429 ac97c_writel(chip, ICA, word); 430 431 /* configure sample format and size */ 432 word = ac97c_readl(chip, CAMR); 433 if (chip->opened <= 1) 434 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 435 else 436 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 437 438 switch (runtime->format) { 439 case SNDRV_PCM_FORMAT_S16_LE: 440 if (cpu_is_at32ap7000()) 441 word |= AC97C_CMR_CEM_LITTLE; 442 break; 443 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 444 word &= ~(AC97C_CMR_CEM_LITTLE); 445 break; 446 default: 447 word = ac97c_readl(chip, ICA); 448 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 449 ac97c_writel(chip, ICA, word); 450 return -EINVAL; 451 } 452 453 /* Enable overrun interrupt on channel A */ 454 word |= AC97C_CSR_OVRUN; 455 456 ac97c_writel(chip, CAMR, word); 457 458 /* Enable channel A event interrupt */ 459 word = ac97c_readl(chip, IMR); 460 word |= AC97C_SR_CAEVT; 461 ac97c_writel(chip, IER, word); 462 463 /* set variable rate if needed */ 464 if (runtime->rate != 48000) { 465 word = ac97c_readl(chip, MR); 466 word |= AC97C_MR_VRA; 467 ac97c_writel(chip, MR, word); 468 } else { 469 word = ac97c_readl(chip, MR); 470 word &= ~(AC97C_MR_VRA); 471 ac97c_writel(chip, MR, word); 472 } 473 474 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, 475 runtime->rate); 476 if (retval) 477 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 478 runtime->rate); 479 480 if (cpu_is_at32ap7000()) { 481 if (!test_bit(DMA_RX_READY, &chip->flags)) 482 retval = atmel_ac97c_prepare_dma(chip, substream, 483 DMA_DEV_TO_MEM); 484 } else { 485 /* Initialize and start the PDC */ 486 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR); 487 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR); 488 writel(runtime->dma_addr + block_size, 489 chip->regs + ATMEL_PDC_RNPR); 490 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR); 491 } 492 493 return retval; 494 } 495 496 static int 497 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) 498 { 499 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 500 unsigned long camr, ptcr = 0; 501 int retval = 0; 502 503 camr = ac97c_readl(chip, CAMR); 504 505 switch (cmd) { 506 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 507 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 508 case SNDRV_PCM_TRIGGER_START: 509 if (cpu_is_at32ap7000()) { 510 retval = dw_dma_cyclic_start(chip->dma.tx_chan); 511 if (retval) 512 goto out; 513 } else { 514 ptcr = ATMEL_PDC_TXTEN; 515 } 516 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX; 517 break; 518 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 519 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 520 case SNDRV_PCM_TRIGGER_STOP: 521 if (cpu_is_at32ap7000()) 522 dw_dma_cyclic_stop(chip->dma.tx_chan); 523 else 524 ptcr |= ATMEL_PDC_TXTDIS; 525 if (chip->opened <= 1) 526 camr &= ~AC97C_CMR_CENA; 527 break; 528 default: 529 retval = -EINVAL; 530 goto out; 531 } 532 533 ac97c_writel(chip, CAMR, camr); 534 if (!cpu_is_at32ap7000()) 535 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 536 out: 537 return retval; 538 } 539 540 static int 541 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) 542 { 543 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 544 unsigned long camr, ptcr = 0; 545 int retval = 0; 546 547 camr = ac97c_readl(chip, CAMR); 548 ptcr = readl(chip->regs + ATMEL_PDC_PTSR); 549 550 switch (cmd) { 551 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 552 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 553 case SNDRV_PCM_TRIGGER_START: 554 if (cpu_is_at32ap7000()) { 555 retval = dw_dma_cyclic_start(chip->dma.rx_chan); 556 if (retval) 557 goto out; 558 } else { 559 ptcr = ATMEL_PDC_RXTEN; 560 } 561 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX; 562 break; 563 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 564 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 565 case SNDRV_PCM_TRIGGER_STOP: 566 if (cpu_is_at32ap7000()) 567 dw_dma_cyclic_stop(chip->dma.rx_chan); 568 else 569 ptcr |= (ATMEL_PDC_RXTDIS); 570 if (chip->opened <= 1) 571 camr &= ~AC97C_CMR_CENA; 572 break; 573 default: 574 retval = -EINVAL; 575 break; 576 } 577 578 ac97c_writel(chip, CAMR, camr); 579 if (!cpu_is_at32ap7000()) 580 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 581 out: 582 return retval; 583 } 584 585 static snd_pcm_uframes_t 586 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) 587 { 588 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 589 struct snd_pcm_runtime *runtime = substream->runtime; 590 snd_pcm_uframes_t frames; 591 unsigned long bytes; 592 593 if (cpu_is_at32ap7000()) 594 bytes = dw_dma_get_src_addr(chip->dma.tx_chan); 595 else 596 bytes = readl(chip->regs + ATMEL_PDC_TPR); 597 bytes -= runtime->dma_addr; 598 599 frames = bytes_to_frames(runtime, bytes); 600 if (frames >= runtime->buffer_size) 601 frames -= runtime->buffer_size; 602 return frames; 603 } 604 605 static snd_pcm_uframes_t 606 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) 607 { 608 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 609 struct snd_pcm_runtime *runtime = substream->runtime; 610 snd_pcm_uframes_t frames; 611 unsigned long bytes; 612 613 if (cpu_is_at32ap7000()) 614 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan); 615 else 616 bytes = readl(chip->regs + ATMEL_PDC_RPR); 617 bytes -= runtime->dma_addr; 618 619 frames = bytes_to_frames(runtime, bytes); 620 if (frames >= runtime->buffer_size) 621 frames -= runtime->buffer_size; 622 return frames; 623 } 624 625 static struct snd_pcm_ops atmel_ac97_playback_ops = { 626 .open = atmel_ac97c_playback_open, 627 .close = atmel_ac97c_playback_close, 628 .ioctl = snd_pcm_lib_ioctl, 629 .hw_params = atmel_ac97c_playback_hw_params, 630 .hw_free = atmel_ac97c_playback_hw_free, 631 .prepare = atmel_ac97c_playback_prepare, 632 .trigger = atmel_ac97c_playback_trigger, 633 .pointer = atmel_ac97c_playback_pointer, 634 }; 635 636 static struct snd_pcm_ops atmel_ac97_capture_ops = { 637 .open = atmel_ac97c_capture_open, 638 .close = atmel_ac97c_capture_close, 639 .ioctl = snd_pcm_lib_ioctl, 640 .hw_params = atmel_ac97c_capture_hw_params, 641 .hw_free = atmel_ac97c_capture_hw_free, 642 .prepare = atmel_ac97c_capture_prepare, 643 .trigger = atmel_ac97c_capture_trigger, 644 .pointer = atmel_ac97c_capture_pointer, 645 }; 646 647 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) 648 { 649 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev; 650 irqreturn_t retval = IRQ_NONE; 651 u32 sr = ac97c_readl(chip, SR); 652 u32 casr = ac97c_readl(chip, CASR); 653 u32 cosr = ac97c_readl(chip, COSR); 654 u32 camr = ac97c_readl(chip, CAMR); 655 656 if (sr & AC97C_SR_CAEVT) { 657 struct snd_pcm_runtime *runtime; 658 int offset, next_period, block_size; 659 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n", 660 casr & AC97C_CSR_OVRUN ? " OVRUN" : "", 661 casr & AC97C_CSR_RXRDY ? " RXRDY" : "", 662 casr & AC97C_CSR_UNRUN ? " UNRUN" : "", 663 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 664 casr & AC97C_CSR_TXRDY ? " TXRDY" : "", 665 !casr ? " NONE" : ""); 666 if (!cpu_is_at32ap7000()) { 667 if ((casr & camr) & AC97C_CSR_ENDTX) { 668 runtime = chip->playback_substream->runtime; 669 block_size = frames_to_bytes(runtime, 670 runtime->period_size); 671 chip->playback_period++; 672 673 if (chip->playback_period == runtime->periods) 674 chip->playback_period = 0; 675 next_period = chip->playback_period + 1; 676 if (next_period == runtime->periods) 677 next_period = 0; 678 679 offset = block_size * next_period; 680 681 writel(runtime->dma_addr + offset, 682 chip->regs + ATMEL_PDC_TNPR); 683 writel(block_size / 2, 684 chip->regs + ATMEL_PDC_TNCR); 685 686 snd_pcm_period_elapsed( 687 chip->playback_substream); 688 } 689 if ((casr & camr) & AC97C_CSR_ENDRX) { 690 runtime = chip->capture_substream->runtime; 691 block_size = frames_to_bytes(runtime, 692 runtime->period_size); 693 chip->capture_period++; 694 695 if (chip->capture_period == runtime->periods) 696 chip->capture_period = 0; 697 next_period = chip->capture_period + 1; 698 if (next_period == runtime->periods) 699 next_period = 0; 700 701 offset = block_size * next_period; 702 703 writel(runtime->dma_addr + offset, 704 chip->regs + ATMEL_PDC_RNPR); 705 writel(block_size / 2, 706 chip->regs + ATMEL_PDC_RNCR); 707 snd_pcm_period_elapsed(chip->capture_substream); 708 } 709 } 710 retval = IRQ_HANDLED; 711 } 712 713 if (sr & AC97C_SR_COEVT) { 714 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n", 715 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "", 716 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "", 717 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 718 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "", 719 !cosr ? " NONE" : ""); 720 retval = IRQ_HANDLED; 721 } 722 723 if (retval == IRQ_NONE) { 724 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x " 725 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr); 726 } 727 728 return retval; 729 } 730 731 static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = { 732 /* Playback */ 733 { 734 .exclusive = 1, 735 .r = { { 736 .slots = ((1 << AC97_SLOT_PCM_LEFT) 737 | (1 << AC97_SLOT_PCM_RIGHT)), 738 } }, 739 }, 740 /* PCM in */ 741 { 742 .stream = 1, 743 .exclusive = 1, 744 .r = { { 745 .slots = ((1 << AC97_SLOT_PCM_LEFT) 746 | (1 << AC97_SLOT_PCM_RIGHT)), 747 } } 748 }, 749 /* Mic in */ 750 { 751 .stream = 1, 752 .exclusive = 1, 753 .r = { { 754 .slots = (1<<AC97_SLOT_MIC), 755 } } 756 }, 757 }; 758 759 static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip) 760 { 761 struct snd_pcm *pcm; 762 struct snd_pcm_hardware hw = atmel_ac97c_hw; 763 int capture, playback, retval, err; 764 765 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 766 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 767 768 if (!cpu_is_at32ap7000()) { 769 err = snd_ac97_pcm_assign(chip->ac97_bus, 770 ARRAY_SIZE(at91_ac97_pcm_defs), 771 at91_ac97_pcm_defs); 772 if (err) 773 return err; 774 } 775 retval = snd_pcm_new(chip->card, chip->card->shortname, 776 chip->pdev->id, playback, capture, &pcm); 777 if (retval) 778 return retval; 779 780 if (capture) 781 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 782 &atmel_ac97_capture_ops); 783 if (playback) 784 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 785 &atmel_ac97_playback_ops); 786 787 retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, 788 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min, 789 hw.buffer_bytes_max); 790 if (retval) 791 return retval; 792 793 pcm->private_data = chip; 794 pcm->info_flags = 0; 795 strcpy(pcm->name, chip->card->shortname); 796 chip->pcm = pcm; 797 798 return 0; 799 } 800 801 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip) 802 { 803 struct snd_ac97_template template; 804 memset(&template, 0, sizeof(template)); 805 template.private_data = chip; 806 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97); 807 } 808 809 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg, 810 unsigned short val) 811 { 812 struct atmel_ac97c *chip = get_chip(ac97); 813 unsigned long word; 814 int timeout = 40; 815 816 word = (reg & 0x7f) << 16 | val; 817 818 do { 819 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) { 820 ac97c_writel(chip, COTHR, word); 821 return; 822 } 823 udelay(1); 824 } while (--timeout); 825 826 dev_dbg(&chip->pdev->dev, "codec write timeout\n"); 827 } 828 829 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97, 830 unsigned short reg) 831 { 832 struct atmel_ac97c *chip = get_chip(ac97); 833 unsigned long word; 834 int timeout = 40; 835 int write = 10; 836 837 word = (0x80 | (reg & 0x7f)) << 16; 838 839 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) 840 ac97c_readl(chip, CORHR); 841 842 retry_write: 843 timeout = 40; 844 845 do { 846 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) { 847 ac97c_writel(chip, COTHR, word); 848 goto read_reg; 849 } 850 udelay(10); 851 } while (--timeout); 852 853 if (!--write) 854 goto timed_out; 855 goto retry_write; 856 857 read_reg: 858 do { 859 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) { 860 unsigned short val = ac97c_readl(chip, CORHR); 861 return val; 862 } 863 udelay(10); 864 } while (--timeout); 865 866 if (!--write) 867 goto timed_out; 868 goto retry_write; 869 870 timed_out: 871 dev_dbg(&chip->pdev->dev, "codec read timeout\n"); 872 return 0xffff; 873 } 874 875 static bool filter(struct dma_chan *chan, void *slave) 876 { 877 struct dw_dma_slave *dws = slave; 878 879 if (dws->dma_dev == chan->device->dev) { 880 chan->private = dws; 881 return true; 882 } else 883 return false; 884 } 885 886 static void atmel_ac97c_reset(struct atmel_ac97c *chip) 887 { 888 ac97c_writel(chip, MR, 0); 889 ac97c_writel(chip, MR, AC97C_MR_ENA); 890 ac97c_writel(chip, CAMR, 0); 891 ac97c_writel(chip, COMR, 0); 892 893 if (gpio_is_valid(chip->reset_pin)) { 894 gpio_set_value(chip->reset_pin, 0); 895 /* AC97 v2.2 specifications says minimum 1 us. */ 896 udelay(2); 897 gpio_set_value(chip->reset_pin, 1); 898 } else { 899 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA); 900 udelay(2); 901 ac97c_writel(chip, MR, AC97C_MR_ENA); 902 } 903 } 904 905 static int __devinit atmel_ac97c_probe(struct platform_device *pdev) 906 { 907 struct snd_card *card; 908 struct atmel_ac97c *chip; 909 struct resource *regs; 910 struct ac97c_platform_data *pdata; 911 struct clk *pclk; 912 static struct snd_ac97_bus_ops ops = { 913 .write = atmel_ac97c_write, 914 .read = atmel_ac97c_read, 915 }; 916 int retval; 917 int irq; 918 919 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 920 if (!regs) { 921 dev_dbg(&pdev->dev, "no memory resource\n"); 922 return -ENXIO; 923 } 924 925 pdata = pdev->dev.platform_data; 926 if (!pdata) { 927 dev_dbg(&pdev->dev, "no platform data\n"); 928 return -ENXIO; 929 } 930 931 irq = platform_get_irq(pdev, 0); 932 if (irq < 0) { 933 dev_dbg(&pdev->dev, "could not get irq\n"); 934 return -ENXIO; 935 } 936 937 if (cpu_is_at32ap7000()) { 938 pclk = clk_get(&pdev->dev, "pclk"); 939 } else { 940 pclk = clk_get(&pdev->dev, "ac97_clk"); 941 } 942 943 if (IS_ERR(pclk)) { 944 dev_dbg(&pdev->dev, "no peripheral clock\n"); 945 return PTR_ERR(pclk); 946 } 947 clk_enable(pclk); 948 949 retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, 950 THIS_MODULE, sizeof(struct atmel_ac97c), &card); 951 if (retval) { 952 dev_dbg(&pdev->dev, "could not create sound card device\n"); 953 goto err_snd_card_new; 954 } 955 956 chip = get_chip(card); 957 958 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip); 959 if (retval) { 960 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq); 961 goto err_request_irq; 962 } 963 chip->irq = irq; 964 965 spin_lock_init(&chip->lock); 966 967 strcpy(card->driver, "Atmel AC97C"); 968 strcpy(card->shortname, "Atmel AC97C"); 969 sprintf(card->longname, "Atmel AC97 controller"); 970 971 chip->card = card; 972 chip->pclk = pclk; 973 chip->pdev = pdev; 974 chip->regs = ioremap(regs->start, resource_size(regs)); 975 976 if (!chip->regs) { 977 dev_dbg(&pdev->dev, "could not remap register memory\n"); 978 retval = -ENOMEM; 979 goto err_ioremap; 980 } 981 982 if (gpio_is_valid(pdata->reset_pin)) { 983 if (gpio_request(pdata->reset_pin, "reset_pin")) { 984 dev_dbg(&pdev->dev, "reset pin not available\n"); 985 chip->reset_pin = -ENODEV; 986 } else { 987 gpio_direction_output(pdata->reset_pin, 1); 988 chip->reset_pin = pdata->reset_pin; 989 } 990 } else { 991 chip->reset_pin = -EINVAL; 992 } 993 994 snd_card_set_dev(card, &pdev->dev); 995 996 atmel_ac97c_reset(chip); 997 998 /* Enable overrun interrupt from codec channel */ 999 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN); 1000 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT); 1001 1002 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus); 1003 if (retval) { 1004 dev_dbg(&pdev->dev, "could not register on ac97 bus\n"); 1005 goto err_ac97_bus; 1006 } 1007 1008 retval = atmel_ac97c_mixer_new(chip); 1009 if (retval) { 1010 dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); 1011 goto err_ac97_bus; 1012 } 1013 1014 if (cpu_is_at32ap7000()) { 1015 if (pdata->rx_dws.dma_dev) { 1016 dma_cap_mask_t mask; 1017 1018 dma_cap_zero(mask); 1019 dma_cap_set(DMA_SLAVE, mask); 1020 1021 chip->dma.rx_chan = dma_request_channel(mask, filter, 1022 &pdata->rx_dws); 1023 if (chip->dma.rx_chan) { 1024 struct dma_slave_config dma_conf = { 1025 .src_addr = regs->start + AC97C_CARHR + 1026 2, 1027 .src_addr_width = 1028 DMA_SLAVE_BUSWIDTH_2_BYTES, 1029 .src_maxburst = 1, 1030 .dst_maxburst = 1, 1031 .direction = DMA_DEV_TO_MEM, 1032 .device_fc = false, 1033 }; 1034 1035 dmaengine_slave_config(chip->dma.rx_chan, 1036 &dma_conf); 1037 } 1038 1039 dev_info(&chip->pdev->dev, "using %s for DMA RX\n", 1040 dev_name(&chip->dma.rx_chan->dev->device)); 1041 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1042 } 1043 1044 if (pdata->tx_dws.dma_dev) { 1045 dma_cap_mask_t mask; 1046 1047 dma_cap_zero(mask); 1048 dma_cap_set(DMA_SLAVE, mask); 1049 1050 chip->dma.tx_chan = dma_request_channel(mask, filter, 1051 &pdata->tx_dws); 1052 if (chip->dma.tx_chan) { 1053 struct dma_slave_config dma_conf = { 1054 .dst_addr = regs->start + AC97C_CATHR + 1055 2, 1056 .dst_addr_width = 1057 DMA_SLAVE_BUSWIDTH_2_BYTES, 1058 .src_maxburst = 1, 1059 .dst_maxburst = 1, 1060 .direction = DMA_MEM_TO_DEV, 1061 .device_fc = false, 1062 }; 1063 1064 dmaengine_slave_config(chip->dma.tx_chan, 1065 &dma_conf); 1066 } 1067 1068 dev_info(&chip->pdev->dev, "using %s for DMA TX\n", 1069 dev_name(&chip->dma.tx_chan->dev->device)); 1070 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1071 } 1072 1073 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) && 1074 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) { 1075 dev_dbg(&pdev->dev, "DMA not available\n"); 1076 retval = -ENODEV; 1077 goto err_dma; 1078 } 1079 } else { 1080 /* Just pretend that we have DMA channel(for at91 i is actually 1081 * the PDC) */ 1082 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1083 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1084 } 1085 1086 retval = atmel_ac97c_pcm_new(chip); 1087 if (retval) { 1088 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n"); 1089 goto err_dma; 1090 } 1091 1092 retval = snd_card_register(card); 1093 if (retval) { 1094 dev_dbg(&pdev->dev, "could not register sound card\n"); 1095 goto err_dma; 1096 } 1097 1098 platform_set_drvdata(pdev, card); 1099 1100 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n", 1101 chip->regs, irq); 1102 1103 return 0; 1104 1105 err_dma: 1106 if (cpu_is_at32ap7000()) { 1107 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) 1108 dma_release_channel(chip->dma.rx_chan); 1109 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) 1110 dma_release_channel(chip->dma.tx_chan); 1111 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1112 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1113 chip->dma.rx_chan = NULL; 1114 chip->dma.tx_chan = NULL; 1115 } 1116 err_ac97_bus: 1117 snd_card_set_dev(card, NULL); 1118 1119 if (gpio_is_valid(chip->reset_pin)) 1120 gpio_free(chip->reset_pin); 1121 1122 iounmap(chip->regs); 1123 err_ioremap: 1124 free_irq(irq, chip); 1125 err_request_irq: 1126 snd_card_free(card); 1127 err_snd_card_new: 1128 clk_disable(pclk); 1129 clk_put(pclk); 1130 return retval; 1131 } 1132 1133 #ifdef CONFIG_PM_SLEEP 1134 static int atmel_ac97c_suspend(struct device *pdev) 1135 { 1136 struct snd_card *card = dev_get_drvdata(pdev); 1137 struct atmel_ac97c *chip = card->private_data; 1138 1139 if (cpu_is_at32ap7000()) { 1140 if (test_bit(DMA_RX_READY, &chip->flags)) 1141 dw_dma_cyclic_stop(chip->dma.rx_chan); 1142 if (test_bit(DMA_TX_READY, &chip->flags)) 1143 dw_dma_cyclic_stop(chip->dma.tx_chan); 1144 } 1145 clk_disable(chip->pclk); 1146 1147 return 0; 1148 } 1149 1150 static int atmel_ac97c_resume(struct device *pdev) 1151 { 1152 struct snd_card *card = dev_get_drvdata(pdev); 1153 struct atmel_ac97c *chip = card->private_data; 1154 1155 clk_enable(chip->pclk); 1156 if (cpu_is_at32ap7000()) { 1157 if (test_bit(DMA_RX_READY, &chip->flags)) 1158 dw_dma_cyclic_start(chip->dma.rx_chan); 1159 if (test_bit(DMA_TX_READY, &chip->flags)) 1160 dw_dma_cyclic_start(chip->dma.tx_chan); 1161 } 1162 return 0; 1163 } 1164 1165 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume); 1166 #define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm 1167 #else 1168 #define ATMEL_AC97C_PM_OPS NULL 1169 #endif 1170 1171 static int __devexit atmel_ac97c_remove(struct platform_device *pdev) 1172 { 1173 struct snd_card *card = platform_get_drvdata(pdev); 1174 struct atmel_ac97c *chip = get_chip(card); 1175 1176 if (gpio_is_valid(chip->reset_pin)) 1177 gpio_free(chip->reset_pin); 1178 1179 ac97c_writel(chip, CAMR, 0); 1180 ac97c_writel(chip, COMR, 0); 1181 ac97c_writel(chip, MR, 0); 1182 1183 clk_disable(chip->pclk); 1184 clk_put(chip->pclk); 1185 iounmap(chip->regs); 1186 free_irq(chip->irq, chip); 1187 1188 if (cpu_is_at32ap7000()) { 1189 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) 1190 dma_release_channel(chip->dma.rx_chan); 1191 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) 1192 dma_release_channel(chip->dma.tx_chan); 1193 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1194 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1195 chip->dma.rx_chan = NULL; 1196 chip->dma.tx_chan = NULL; 1197 } 1198 1199 snd_card_set_dev(card, NULL); 1200 snd_card_free(card); 1201 1202 platform_set_drvdata(pdev, NULL); 1203 1204 return 0; 1205 } 1206 1207 static struct platform_driver atmel_ac97c_driver = { 1208 .remove = __devexit_p(atmel_ac97c_remove), 1209 .driver = { 1210 .name = "atmel_ac97c", 1211 .owner = THIS_MODULE, 1212 .pm = ATMEL_AC97C_PM_OPS, 1213 }, 1214 }; 1215 1216 static int __init atmel_ac97c_init(void) 1217 { 1218 return platform_driver_probe(&atmel_ac97c_driver, 1219 atmel_ac97c_probe); 1220 } 1221 module_init(atmel_ac97c_init); 1222 1223 static void __exit atmel_ac97c_exit(void) 1224 { 1225 platform_driver_unregister(&atmel_ac97c_driver); 1226 } 1227 module_exit(atmel_ac97c_exit); 1228 1229 MODULE_LICENSE("GPL"); 1230 MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); 1231 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); 1232