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 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 = pcm_format_to_bits(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 = pcm_format_to_bits(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() && retval == 1) 281 if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) 282 dw_dma_cyclic_free(chip->dma.rx_chan); 283 284 /* Set restrictions to params. */ 285 mutex_lock(&opened_mutex); 286 chip->cur_rate = params_rate(hw_params); 287 chip->cur_format = params_format(hw_params); 288 mutex_unlock(&opened_mutex); 289 290 return retval; 291 } 292 293 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream) 294 { 295 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 296 if (cpu_is_at32ap7000()) { 297 if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) 298 dw_dma_cyclic_free(chip->dma.tx_chan); 299 } 300 return snd_pcm_lib_free_pages(substream); 301 } 302 303 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream) 304 { 305 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 306 if (cpu_is_at32ap7000()) { 307 if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) 308 dw_dma_cyclic_free(chip->dma.rx_chan); 309 } 310 return snd_pcm_lib_free_pages(substream); 311 } 312 313 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) 314 { 315 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 316 struct snd_pcm_runtime *runtime = substream->runtime; 317 int block_size = frames_to_bytes(runtime, runtime->period_size); 318 unsigned long word = ac97c_readl(chip, OCA); 319 int retval; 320 321 chip->playback_period = 0; 322 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 323 324 /* assign channels to AC97C channel A */ 325 switch (runtime->channels) { 326 case 1: 327 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 328 break; 329 case 2: 330 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 331 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 332 break; 333 default: 334 /* TODO: support more than two channels */ 335 return -EINVAL; 336 } 337 ac97c_writel(chip, OCA, word); 338 339 /* configure sample format and size */ 340 word = ac97c_readl(chip, CAMR); 341 if (chip->opened <= 1) 342 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 343 else 344 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 345 346 switch (runtime->format) { 347 case SNDRV_PCM_FORMAT_S16_LE: 348 if (cpu_is_at32ap7000()) 349 word |= AC97C_CMR_CEM_LITTLE; 350 break; 351 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 352 word &= ~(AC97C_CMR_CEM_LITTLE); 353 break; 354 default: 355 word = ac97c_readl(chip, OCA); 356 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 357 ac97c_writel(chip, OCA, word); 358 return -EINVAL; 359 } 360 361 /* Enable underrun interrupt on channel A */ 362 word |= AC97C_CSR_UNRUN; 363 364 ac97c_writel(chip, CAMR, word); 365 366 /* Enable channel A event interrupt */ 367 word = ac97c_readl(chip, IMR); 368 word |= AC97C_SR_CAEVT; 369 ac97c_writel(chip, IER, word); 370 371 /* set variable rate if needed */ 372 if (runtime->rate != 48000) { 373 word = ac97c_readl(chip, MR); 374 word |= AC97C_MR_VRA; 375 ac97c_writel(chip, MR, word); 376 } else { 377 word = ac97c_readl(chip, MR); 378 word &= ~(AC97C_MR_VRA); 379 ac97c_writel(chip, MR, word); 380 } 381 382 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, 383 runtime->rate); 384 if (retval) 385 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 386 runtime->rate); 387 388 if (cpu_is_at32ap7000()) { 389 if (!test_bit(DMA_TX_READY, &chip->flags)) 390 retval = atmel_ac97c_prepare_dma(chip, substream, 391 DMA_MEM_TO_DEV); 392 } else { 393 /* Initialize and start the PDC */ 394 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR); 395 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR); 396 writel(runtime->dma_addr + block_size, 397 chip->regs + ATMEL_PDC_TNPR); 398 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR); 399 } 400 401 return retval; 402 } 403 404 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) 405 { 406 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 407 struct snd_pcm_runtime *runtime = substream->runtime; 408 int block_size = frames_to_bytes(runtime, runtime->period_size); 409 unsigned long word = ac97c_readl(chip, ICA); 410 int retval; 411 412 chip->capture_period = 0; 413 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 414 415 /* assign channels to AC97C channel A */ 416 switch (runtime->channels) { 417 case 1: 418 word |= AC97C_CH_ASSIGN(PCM_LEFT, A); 419 break; 420 case 2: 421 word |= AC97C_CH_ASSIGN(PCM_LEFT, A) 422 | AC97C_CH_ASSIGN(PCM_RIGHT, A); 423 break; 424 default: 425 /* TODO: support more than two channels */ 426 return -EINVAL; 427 } 428 ac97c_writel(chip, ICA, word); 429 430 /* configure sample format and size */ 431 word = ac97c_readl(chip, CAMR); 432 if (chip->opened <= 1) 433 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 434 else 435 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; 436 437 switch (runtime->format) { 438 case SNDRV_PCM_FORMAT_S16_LE: 439 if (cpu_is_at32ap7000()) 440 word |= AC97C_CMR_CEM_LITTLE; 441 break; 442 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ 443 word &= ~(AC97C_CMR_CEM_LITTLE); 444 break; 445 default: 446 word = ac97c_readl(chip, ICA); 447 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT)); 448 ac97c_writel(chip, ICA, word); 449 return -EINVAL; 450 } 451 452 /* Enable overrun interrupt on channel A */ 453 word |= AC97C_CSR_OVRUN; 454 455 ac97c_writel(chip, CAMR, word); 456 457 /* Enable channel A event interrupt */ 458 word = ac97c_readl(chip, IMR); 459 word |= AC97C_SR_CAEVT; 460 ac97c_writel(chip, IER, word); 461 462 /* set variable rate if needed */ 463 if (runtime->rate != 48000) { 464 word = ac97c_readl(chip, MR); 465 word |= AC97C_MR_VRA; 466 ac97c_writel(chip, MR, word); 467 } else { 468 word = ac97c_readl(chip, MR); 469 word &= ~(AC97C_MR_VRA); 470 ac97c_writel(chip, MR, word); 471 } 472 473 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, 474 runtime->rate); 475 if (retval) 476 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", 477 runtime->rate); 478 479 if (cpu_is_at32ap7000()) { 480 if (!test_bit(DMA_RX_READY, &chip->flags)) 481 retval = atmel_ac97c_prepare_dma(chip, substream, 482 DMA_DEV_TO_MEM); 483 } else { 484 /* Initialize and start the PDC */ 485 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR); 486 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR); 487 writel(runtime->dma_addr + block_size, 488 chip->regs + ATMEL_PDC_RNPR); 489 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR); 490 } 491 492 return retval; 493 } 494 495 static int 496 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) 497 { 498 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 499 unsigned long camr, ptcr = 0; 500 int retval = 0; 501 502 camr = ac97c_readl(chip, CAMR); 503 504 switch (cmd) { 505 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 506 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 507 case SNDRV_PCM_TRIGGER_START: 508 if (cpu_is_at32ap7000()) { 509 retval = dw_dma_cyclic_start(chip->dma.tx_chan); 510 if (retval) 511 goto out; 512 } else { 513 ptcr = ATMEL_PDC_TXTEN; 514 } 515 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX; 516 break; 517 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 518 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 519 case SNDRV_PCM_TRIGGER_STOP: 520 if (cpu_is_at32ap7000()) 521 dw_dma_cyclic_stop(chip->dma.tx_chan); 522 else 523 ptcr |= ATMEL_PDC_TXTDIS; 524 if (chip->opened <= 1) 525 camr &= ~AC97C_CMR_CENA; 526 break; 527 default: 528 retval = -EINVAL; 529 goto out; 530 } 531 532 ac97c_writel(chip, CAMR, camr); 533 if (!cpu_is_at32ap7000()) 534 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 535 out: 536 return retval; 537 } 538 539 static int 540 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) 541 { 542 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 543 unsigned long camr, ptcr = 0; 544 int retval = 0; 545 546 camr = ac97c_readl(chip, CAMR); 547 ptcr = readl(chip->regs + ATMEL_PDC_PTSR); 548 549 switch (cmd) { 550 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ 551 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ 552 case SNDRV_PCM_TRIGGER_START: 553 if (cpu_is_at32ap7000()) { 554 retval = dw_dma_cyclic_start(chip->dma.rx_chan); 555 if (retval) 556 goto out; 557 } else { 558 ptcr = ATMEL_PDC_RXTEN; 559 } 560 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX; 561 break; 562 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ 563 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ 564 case SNDRV_PCM_TRIGGER_STOP: 565 if (cpu_is_at32ap7000()) 566 dw_dma_cyclic_stop(chip->dma.rx_chan); 567 else 568 ptcr |= (ATMEL_PDC_RXTDIS); 569 if (chip->opened <= 1) 570 camr &= ~AC97C_CMR_CENA; 571 break; 572 default: 573 retval = -EINVAL; 574 break; 575 } 576 577 ac97c_writel(chip, CAMR, camr); 578 if (!cpu_is_at32ap7000()) 579 writel(ptcr, chip->regs + ATMEL_PDC_PTCR); 580 out: 581 return retval; 582 } 583 584 static snd_pcm_uframes_t 585 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) 586 { 587 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 588 struct snd_pcm_runtime *runtime = substream->runtime; 589 snd_pcm_uframes_t frames; 590 unsigned long bytes; 591 592 if (cpu_is_at32ap7000()) 593 bytes = dw_dma_get_src_addr(chip->dma.tx_chan); 594 else 595 bytes = readl(chip->regs + ATMEL_PDC_TPR); 596 bytes -= runtime->dma_addr; 597 598 frames = bytes_to_frames(runtime, bytes); 599 if (frames >= runtime->buffer_size) 600 frames -= runtime->buffer_size; 601 return frames; 602 } 603 604 static snd_pcm_uframes_t 605 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) 606 { 607 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); 608 struct snd_pcm_runtime *runtime = substream->runtime; 609 snd_pcm_uframes_t frames; 610 unsigned long bytes; 611 612 if (cpu_is_at32ap7000()) 613 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan); 614 else 615 bytes = readl(chip->regs + ATMEL_PDC_RPR); 616 bytes -= runtime->dma_addr; 617 618 frames = bytes_to_frames(runtime, bytes); 619 if (frames >= runtime->buffer_size) 620 frames -= runtime->buffer_size; 621 return frames; 622 } 623 624 static struct snd_pcm_ops atmel_ac97_playback_ops = { 625 .open = atmel_ac97c_playback_open, 626 .close = atmel_ac97c_playback_close, 627 .ioctl = snd_pcm_lib_ioctl, 628 .hw_params = atmel_ac97c_playback_hw_params, 629 .hw_free = atmel_ac97c_playback_hw_free, 630 .prepare = atmel_ac97c_playback_prepare, 631 .trigger = atmel_ac97c_playback_trigger, 632 .pointer = atmel_ac97c_playback_pointer, 633 }; 634 635 static struct snd_pcm_ops atmel_ac97_capture_ops = { 636 .open = atmel_ac97c_capture_open, 637 .close = atmel_ac97c_capture_close, 638 .ioctl = snd_pcm_lib_ioctl, 639 .hw_params = atmel_ac97c_capture_hw_params, 640 .hw_free = atmel_ac97c_capture_hw_free, 641 .prepare = atmel_ac97c_capture_prepare, 642 .trigger = atmel_ac97c_capture_trigger, 643 .pointer = atmel_ac97c_capture_pointer, 644 }; 645 646 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev) 647 { 648 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev; 649 irqreturn_t retval = IRQ_NONE; 650 u32 sr = ac97c_readl(chip, SR); 651 u32 casr = ac97c_readl(chip, CASR); 652 u32 cosr = ac97c_readl(chip, COSR); 653 u32 camr = ac97c_readl(chip, CAMR); 654 655 if (sr & AC97C_SR_CAEVT) { 656 struct snd_pcm_runtime *runtime; 657 int offset, next_period, block_size; 658 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n", 659 casr & AC97C_CSR_OVRUN ? " OVRUN" : "", 660 casr & AC97C_CSR_RXRDY ? " RXRDY" : "", 661 casr & AC97C_CSR_UNRUN ? " UNRUN" : "", 662 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 663 casr & AC97C_CSR_TXRDY ? " TXRDY" : "", 664 !casr ? " NONE" : ""); 665 if (!cpu_is_at32ap7000()) { 666 if ((casr & camr) & AC97C_CSR_ENDTX) { 667 runtime = chip->playback_substream->runtime; 668 block_size = frames_to_bytes(runtime, 669 runtime->period_size); 670 chip->playback_period++; 671 672 if (chip->playback_period == runtime->periods) 673 chip->playback_period = 0; 674 next_period = chip->playback_period + 1; 675 if (next_period == runtime->periods) 676 next_period = 0; 677 678 offset = block_size * next_period; 679 680 writel(runtime->dma_addr + offset, 681 chip->regs + ATMEL_PDC_TNPR); 682 writel(block_size / 2, 683 chip->regs + ATMEL_PDC_TNCR); 684 685 snd_pcm_period_elapsed( 686 chip->playback_substream); 687 } 688 if ((casr & camr) & AC97C_CSR_ENDRX) { 689 runtime = chip->capture_substream->runtime; 690 block_size = frames_to_bytes(runtime, 691 runtime->period_size); 692 chip->capture_period++; 693 694 if (chip->capture_period == runtime->periods) 695 chip->capture_period = 0; 696 next_period = chip->capture_period + 1; 697 if (next_period == runtime->periods) 698 next_period = 0; 699 700 offset = block_size * next_period; 701 702 writel(runtime->dma_addr + offset, 703 chip->regs + ATMEL_PDC_RNPR); 704 writel(block_size / 2, 705 chip->regs + ATMEL_PDC_RNCR); 706 snd_pcm_period_elapsed(chip->capture_substream); 707 } 708 } 709 retval = IRQ_HANDLED; 710 } 711 712 if (sr & AC97C_SR_COEVT) { 713 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n", 714 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "", 715 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "", 716 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "", 717 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "", 718 !cosr ? " NONE" : ""); 719 retval = IRQ_HANDLED; 720 } 721 722 if (retval == IRQ_NONE) { 723 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x " 724 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr); 725 } 726 727 return retval; 728 } 729 730 static struct ac97_pcm at91_ac97_pcm_defs[] = { 731 /* Playback */ 732 { 733 .exclusive = 1, 734 .r = { { 735 .slots = ((1 << AC97_SLOT_PCM_LEFT) 736 | (1 << AC97_SLOT_PCM_RIGHT)), 737 } }, 738 }, 739 /* PCM in */ 740 { 741 .stream = 1, 742 .exclusive = 1, 743 .r = { { 744 .slots = ((1 << AC97_SLOT_PCM_LEFT) 745 | (1 << AC97_SLOT_PCM_RIGHT)), 746 } } 747 }, 748 /* Mic in */ 749 { 750 .stream = 1, 751 .exclusive = 1, 752 .r = { { 753 .slots = (1<<AC97_SLOT_MIC), 754 } } 755 }, 756 }; 757 758 static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip) 759 { 760 struct snd_pcm *pcm; 761 struct snd_pcm_hardware hw = atmel_ac97c_hw; 762 int capture, playback, retval, err; 763 764 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 765 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 766 767 if (!cpu_is_at32ap7000()) { 768 err = snd_ac97_pcm_assign(chip->ac97_bus, 769 ARRAY_SIZE(at91_ac97_pcm_defs), 770 at91_ac97_pcm_defs); 771 if (err) 772 return err; 773 } 774 retval = snd_pcm_new(chip->card, chip->card->shortname, 775 chip->pdev->id, playback, capture, &pcm); 776 if (retval) 777 return retval; 778 779 if (capture) 780 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 781 &atmel_ac97_capture_ops); 782 if (playback) 783 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 784 &atmel_ac97_playback_ops); 785 786 retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, 787 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min, 788 hw.buffer_bytes_max); 789 if (retval) 790 return retval; 791 792 pcm->private_data = chip; 793 pcm->info_flags = 0; 794 strcpy(pcm->name, chip->card->shortname); 795 chip->pcm = pcm; 796 797 return 0; 798 } 799 800 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip) 801 { 802 struct snd_ac97_template template; 803 memset(&template, 0, sizeof(template)); 804 template.private_data = chip; 805 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97); 806 } 807 808 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg, 809 unsigned short val) 810 { 811 struct atmel_ac97c *chip = get_chip(ac97); 812 unsigned long word; 813 int timeout = 40; 814 815 word = (reg & 0x7f) << 16 | val; 816 817 do { 818 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) { 819 ac97c_writel(chip, COTHR, word); 820 return; 821 } 822 udelay(1); 823 } while (--timeout); 824 825 dev_dbg(&chip->pdev->dev, "codec write timeout\n"); 826 } 827 828 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97, 829 unsigned short reg) 830 { 831 struct atmel_ac97c *chip = get_chip(ac97); 832 unsigned long word; 833 int timeout = 40; 834 int write = 10; 835 836 word = (0x80 | (reg & 0x7f)) << 16; 837 838 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) 839 ac97c_readl(chip, CORHR); 840 841 retry_write: 842 timeout = 40; 843 844 do { 845 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) { 846 ac97c_writel(chip, COTHR, word); 847 goto read_reg; 848 } 849 udelay(10); 850 } while (--timeout); 851 852 if (!--write) 853 goto timed_out; 854 goto retry_write; 855 856 read_reg: 857 do { 858 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) { 859 unsigned short val = ac97c_readl(chip, CORHR); 860 return val; 861 } 862 udelay(10); 863 } while (--timeout); 864 865 if (!--write) 866 goto timed_out; 867 goto retry_write; 868 869 timed_out: 870 dev_dbg(&chip->pdev->dev, "codec read timeout\n"); 871 return 0xffff; 872 } 873 874 static bool filter(struct dma_chan *chan, void *slave) 875 { 876 struct dw_dma_slave *dws = slave; 877 878 if (dws->dma_dev == chan->device->dev) { 879 chan->private = dws; 880 return true; 881 } else 882 return false; 883 } 884 885 static void atmel_ac97c_reset(struct atmel_ac97c *chip) 886 { 887 ac97c_writel(chip, MR, 0); 888 ac97c_writel(chip, MR, AC97C_MR_ENA); 889 ac97c_writel(chip, CAMR, 0); 890 ac97c_writel(chip, COMR, 0); 891 892 if (gpio_is_valid(chip->reset_pin)) { 893 gpio_set_value(chip->reset_pin, 0); 894 /* AC97 v2.2 specifications says minimum 1 us. */ 895 udelay(2); 896 gpio_set_value(chip->reset_pin, 1); 897 } else { 898 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA); 899 udelay(2); 900 ac97c_writel(chip, MR, AC97C_MR_ENA); 901 } 902 } 903 904 static int atmel_ac97c_probe(struct platform_device *pdev) 905 { 906 struct snd_card *card; 907 struct atmel_ac97c *chip; 908 struct resource *regs; 909 struct ac97c_platform_data *pdata; 910 struct clk *pclk; 911 static struct snd_ac97_bus_ops ops = { 912 .write = atmel_ac97c_write, 913 .read = atmel_ac97c_read, 914 }; 915 int retval; 916 int irq; 917 918 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 919 if (!regs) { 920 dev_dbg(&pdev->dev, "no memory resource\n"); 921 return -ENXIO; 922 } 923 924 pdata = pdev->dev.platform_data; 925 if (!pdata) { 926 dev_dbg(&pdev->dev, "no platform data\n"); 927 return -ENXIO; 928 } 929 930 irq = platform_get_irq(pdev, 0); 931 if (irq < 0) { 932 dev_dbg(&pdev->dev, "could not get irq\n"); 933 return -ENXIO; 934 } 935 936 if (cpu_is_at32ap7000()) { 937 pclk = clk_get(&pdev->dev, "pclk"); 938 } else { 939 pclk = clk_get(&pdev->dev, "ac97_clk"); 940 } 941 942 if (IS_ERR(pclk)) { 943 dev_dbg(&pdev->dev, "no peripheral clock\n"); 944 return PTR_ERR(pclk); 945 } 946 clk_enable(pclk); 947 948 retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, 949 SNDRV_DEFAULT_STR1, THIS_MODULE, 950 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 atmel_ac97c_reset(chip); 995 996 /* Enable overrun interrupt from codec channel */ 997 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN); 998 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT); 999 1000 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus); 1001 if (retval) { 1002 dev_dbg(&pdev->dev, "could not register on ac97 bus\n"); 1003 goto err_ac97_bus; 1004 } 1005 1006 retval = atmel_ac97c_mixer_new(chip); 1007 if (retval) { 1008 dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); 1009 goto err_ac97_bus; 1010 } 1011 1012 if (cpu_is_at32ap7000()) { 1013 if (pdata->rx_dws.dma_dev) { 1014 dma_cap_mask_t mask; 1015 1016 dma_cap_zero(mask); 1017 dma_cap_set(DMA_SLAVE, mask); 1018 1019 chip->dma.rx_chan = dma_request_channel(mask, filter, 1020 &pdata->rx_dws); 1021 if (chip->dma.rx_chan) { 1022 struct dma_slave_config dma_conf = { 1023 .src_addr = regs->start + AC97C_CARHR + 1024 2, 1025 .src_addr_width = 1026 DMA_SLAVE_BUSWIDTH_2_BYTES, 1027 .src_maxburst = 1, 1028 .dst_maxburst = 1, 1029 .direction = DMA_DEV_TO_MEM, 1030 .device_fc = false, 1031 }; 1032 1033 dmaengine_slave_config(chip->dma.rx_chan, 1034 &dma_conf); 1035 } 1036 1037 dev_info(&chip->pdev->dev, "using %s for DMA RX\n", 1038 dev_name(&chip->dma.rx_chan->dev->device)); 1039 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1040 } 1041 1042 if (pdata->tx_dws.dma_dev) { 1043 dma_cap_mask_t mask; 1044 1045 dma_cap_zero(mask); 1046 dma_cap_set(DMA_SLAVE, mask); 1047 1048 chip->dma.tx_chan = dma_request_channel(mask, filter, 1049 &pdata->tx_dws); 1050 if (chip->dma.tx_chan) { 1051 struct dma_slave_config dma_conf = { 1052 .dst_addr = regs->start + AC97C_CATHR + 1053 2, 1054 .dst_addr_width = 1055 DMA_SLAVE_BUSWIDTH_2_BYTES, 1056 .src_maxburst = 1, 1057 .dst_maxburst = 1, 1058 .direction = DMA_MEM_TO_DEV, 1059 .device_fc = false, 1060 }; 1061 1062 dmaengine_slave_config(chip->dma.tx_chan, 1063 &dma_conf); 1064 } 1065 1066 dev_info(&chip->pdev->dev, "using %s for DMA TX\n", 1067 dev_name(&chip->dma.tx_chan->dev->device)); 1068 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1069 } 1070 1071 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) && 1072 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) { 1073 dev_dbg(&pdev->dev, "DMA not available\n"); 1074 retval = -ENODEV; 1075 goto err_dma; 1076 } 1077 } else { 1078 /* Just pretend that we have DMA channel(for at91 i is actually 1079 * the PDC) */ 1080 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1081 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1082 } 1083 1084 retval = atmel_ac97c_pcm_new(chip); 1085 if (retval) { 1086 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n"); 1087 goto err_dma; 1088 } 1089 1090 retval = snd_card_register(card); 1091 if (retval) { 1092 dev_dbg(&pdev->dev, "could not register sound card\n"); 1093 goto err_dma; 1094 } 1095 1096 platform_set_drvdata(pdev, card); 1097 1098 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n", 1099 chip->regs, irq); 1100 1101 return 0; 1102 1103 err_dma: 1104 if (cpu_is_at32ap7000()) { 1105 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) 1106 dma_release_channel(chip->dma.rx_chan); 1107 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) 1108 dma_release_channel(chip->dma.tx_chan); 1109 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1110 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1111 chip->dma.rx_chan = NULL; 1112 chip->dma.tx_chan = NULL; 1113 } 1114 err_ac97_bus: 1115 if (gpio_is_valid(chip->reset_pin)) 1116 gpio_free(chip->reset_pin); 1117 1118 iounmap(chip->regs); 1119 err_ioremap: 1120 free_irq(irq, chip); 1121 err_request_irq: 1122 snd_card_free(card); 1123 err_snd_card_new: 1124 clk_disable(pclk); 1125 clk_put(pclk); 1126 return retval; 1127 } 1128 1129 #ifdef CONFIG_PM_SLEEP 1130 static int atmel_ac97c_suspend(struct device *pdev) 1131 { 1132 struct snd_card *card = dev_get_drvdata(pdev); 1133 struct atmel_ac97c *chip = card->private_data; 1134 1135 if (cpu_is_at32ap7000()) { 1136 if (test_bit(DMA_RX_READY, &chip->flags)) 1137 dw_dma_cyclic_stop(chip->dma.rx_chan); 1138 if (test_bit(DMA_TX_READY, &chip->flags)) 1139 dw_dma_cyclic_stop(chip->dma.tx_chan); 1140 } 1141 clk_disable(chip->pclk); 1142 1143 return 0; 1144 } 1145 1146 static int atmel_ac97c_resume(struct device *pdev) 1147 { 1148 struct snd_card *card = dev_get_drvdata(pdev); 1149 struct atmel_ac97c *chip = card->private_data; 1150 1151 clk_enable(chip->pclk); 1152 if (cpu_is_at32ap7000()) { 1153 if (test_bit(DMA_RX_READY, &chip->flags)) 1154 dw_dma_cyclic_start(chip->dma.rx_chan); 1155 if (test_bit(DMA_TX_READY, &chip->flags)) 1156 dw_dma_cyclic_start(chip->dma.tx_chan); 1157 } 1158 return 0; 1159 } 1160 1161 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume); 1162 #define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm 1163 #else 1164 #define ATMEL_AC97C_PM_OPS NULL 1165 #endif 1166 1167 static int atmel_ac97c_remove(struct platform_device *pdev) 1168 { 1169 struct snd_card *card = platform_get_drvdata(pdev); 1170 struct atmel_ac97c *chip = get_chip(card); 1171 1172 if (gpio_is_valid(chip->reset_pin)) 1173 gpio_free(chip->reset_pin); 1174 1175 ac97c_writel(chip, CAMR, 0); 1176 ac97c_writel(chip, COMR, 0); 1177 ac97c_writel(chip, MR, 0); 1178 1179 clk_disable(chip->pclk); 1180 clk_put(chip->pclk); 1181 iounmap(chip->regs); 1182 free_irq(chip->irq, chip); 1183 1184 if (cpu_is_at32ap7000()) { 1185 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) 1186 dma_release_channel(chip->dma.rx_chan); 1187 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) 1188 dma_release_channel(chip->dma.tx_chan); 1189 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); 1190 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); 1191 chip->dma.rx_chan = NULL; 1192 chip->dma.tx_chan = NULL; 1193 } 1194 1195 snd_card_free(card); 1196 1197 return 0; 1198 } 1199 1200 static struct platform_driver atmel_ac97c_driver = { 1201 .remove = atmel_ac97c_remove, 1202 .driver = { 1203 .name = "atmel_ac97c", 1204 .owner = THIS_MODULE, 1205 .pm = ATMEL_AC97C_PM_OPS, 1206 }, 1207 }; 1208 1209 static int __init atmel_ac97c_init(void) 1210 { 1211 return platform_driver_probe(&atmel_ac97c_driver, 1212 atmel_ac97c_probe); 1213 } 1214 module_init(atmel_ac97c_init); 1215 1216 static void __exit atmel_ac97c_exit(void) 1217 { 1218 platform_driver_unregister(&atmel_ac97c_driver); 1219 } 1220 module_exit(atmel_ac97c_exit); 1221 1222 MODULE_LICENSE("GPL"); 1223 MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); 1224 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); 1225