1 /* 2 * Freescale MPC5200 PSC DMA 3 * ALSA SoC Platform driver 4 * 5 * Copyright (C) 2008 Secret Lab Technologies Ltd. 6 * Copyright (C) 2009 Jon Smirl, Digispeaker 7 */ 8 9 #include <linux/module.h> 10 #include <linux/of_device.h> 11 #include <linux/dma-mapping.h> 12 #include <linux/slab.h> 13 #include <linux/of_platform.h> 14 15 #include <sound/soc.h> 16 17 #include <linux/fsl/bestcomm/bestcomm.h> 18 #include <linux/fsl/bestcomm/gen_bd.h> 19 #include <asm/mpc52xx_psc.h> 20 21 #include "mpc5200_dma.h" 22 23 /* 24 * Interrupt handlers 25 */ 26 static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma) 27 { 28 struct psc_dma *psc_dma = _psc_dma; 29 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; 30 u16 isr; 31 32 isr = in_be16(®s->mpc52xx_psc_isr); 33 34 /* Playback underrun error */ 35 if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP)) 36 psc_dma->stats.underrun_count++; 37 38 /* Capture overrun error */ 39 if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR)) 40 psc_dma->stats.overrun_count++; 41 42 out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT); 43 44 return IRQ_HANDLED; 45 } 46 47 /** 48 * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer 49 * @s: pointer to stream private data structure 50 * 51 * Enqueues another audio period buffer into the bestcomm queue. 52 * 53 * Note: The routine must only be called when there is space available in 54 * the queue. Otherwise the enqueue will fail and the audio ring buffer 55 * will get out of sync 56 */ 57 static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s) 58 { 59 struct bcom_bd *bd; 60 61 /* Prepare and enqueue the next buffer descriptor */ 62 bd = bcom_prepare_next_buffer(s->bcom_task); 63 bd->status = s->period_bytes; 64 bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes); 65 bcom_submit_next_buffer(s->bcom_task, NULL); 66 67 /* Update for next period */ 68 s->period_next = (s->period_next + 1) % s->runtime->periods; 69 } 70 71 /* Bestcomm DMA irq handler */ 72 static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream) 73 { 74 struct psc_dma_stream *s = _psc_dma_stream; 75 76 spin_lock(&s->psc_dma->lock); 77 /* For each finished period, dequeue the completed period buffer 78 * and enqueue a new one in it's place. */ 79 while (bcom_buffer_done(s->bcom_task)) { 80 bcom_retrieve_buffer(s->bcom_task, NULL, NULL); 81 82 s->period_current = (s->period_current+1) % s->runtime->periods; 83 s->period_count++; 84 85 psc_dma_bcom_enqueue_next_buffer(s); 86 } 87 spin_unlock(&s->psc_dma->lock); 88 89 /* If the stream is active, then also inform the PCM middle layer 90 * of the period finished event. */ 91 if (s->active) 92 snd_pcm_period_elapsed(s->stream); 93 94 return IRQ_HANDLED; 95 } 96 97 static int psc_dma_hw_free(struct snd_pcm_substream *substream) 98 { 99 snd_pcm_set_runtime_buffer(substream, NULL); 100 return 0; 101 } 102 103 /** 104 * psc_dma_trigger: start and stop the DMA transfer. 105 * 106 * This function is called by ALSA to start, stop, pause, and resume the DMA 107 * transfer of data. 108 */ 109 static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd) 110 { 111 struct snd_soc_pcm_runtime *rtd = substream->private_data; 112 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); 113 struct snd_pcm_runtime *runtime = substream->runtime; 114 struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); 115 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; 116 u16 imr; 117 unsigned long flags; 118 int i; 119 120 switch (cmd) { 121 case SNDRV_PCM_TRIGGER_START: 122 dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n", 123 substream->pstr->stream, runtime->frame_bits, 124 (int)runtime->period_size, runtime->periods); 125 s->period_bytes = frames_to_bytes(runtime, 126 runtime->period_size); 127 s->period_next = 0; 128 s->period_current = 0; 129 s->active = 1; 130 s->period_count = 0; 131 s->runtime = runtime; 132 133 /* Fill up the bestcomm bd queue and enable DMA. 134 * This will begin filling the PSC's fifo. 135 */ 136 spin_lock_irqsave(&psc_dma->lock, flags); 137 138 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 139 bcom_gen_bd_rx_reset(s->bcom_task); 140 else 141 bcom_gen_bd_tx_reset(s->bcom_task); 142 143 for (i = 0; i < runtime->periods; i++) 144 if (!bcom_queue_full(s->bcom_task)) 145 psc_dma_bcom_enqueue_next_buffer(s); 146 147 bcom_enable(s->bcom_task); 148 spin_unlock_irqrestore(&psc_dma->lock, flags); 149 150 out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT); 151 152 break; 153 154 case SNDRV_PCM_TRIGGER_STOP: 155 dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n", 156 substream->pstr->stream, s->period_count); 157 s->active = 0; 158 159 spin_lock_irqsave(&psc_dma->lock, flags); 160 bcom_disable(s->bcom_task); 161 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 162 bcom_gen_bd_rx_reset(s->bcom_task); 163 else 164 bcom_gen_bd_tx_reset(s->bcom_task); 165 spin_unlock_irqrestore(&psc_dma->lock, flags); 166 167 break; 168 169 default: 170 dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n", 171 substream->pstr->stream, cmd); 172 return -EINVAL; 173 } 174 175 /* Update interrupt enable settings */ 176 imr = 0; 177 if (psc_dma->playback.active) 178 imr |= MPC52xx_PSC_IMR_TXEMP; 179 if (psc_dma->capture.active) 180 imr |= MPC52xx_PSC_IMR_ORERR; 181 out_be16(®s->isr_imr.imr, psc_dma->imr | imr); 182 183 return 0; 184 } 185 186 187 /* --------------------------------------------------------------------- 188 * The PSC DMA 'ASoC platform' driver 189 * 190 * Can be referenced by an 'ASoC machine' driver 191 * This driver only deals with the audio bus; it doesn't have any 192 * interaction with the attached codec 193 */ 194 195 static const struct snd_pcm_hardware psc_dma_hardware = { 196 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | 197 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | 198 SNDRV_PCM_INFO_BATCH, 199 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | 200 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE, 201 .rate_min = 8000, 202 .rate_max = 48000, 203 .channels_min = 1, 204 .channels_max = 2, 205 .period_bytes_max = 1024 * 1024, 206 .period_bytes_min = 32, 207 .periods_min = 2, 208 .periods_max = 256, 209 .buffer_bytes_max = 2 * 1024 * 1024, 210 .fifo_size = 512, 211 }; 212 213 static int psc_dma_open(struct snd_pcm_substream *substream) 214 { 215 struct snd_pcm_runtime *runtime = substream->runtime; 216 struct snd_soc_pcm_runtime *rtd = substream->private_data; 217 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); 218 struct psc_dma_stream *s; 219 int rc; 220 221 dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream); 222 223 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 224 s = &psc_dma->capture; 225 else 226 s = &psc_dma->playback; 227 228 snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware); 229 230 rc = snd_pcm_hw_constraint_integer(runtime, 231 SNDRV_PCM_HW_PARAM_PERIODS); 232 if (rc < 0) { 233 dev_err(substream->pcm->card->dev, "invalid buffer size\n"); 234 return rc; 235 } 236 237 s->stream = substream; 238 return 0; 239 } 240 241 static int psc_dma_close(struct snd_pcm_substream *substream) 242 { 243 struct snd_soc_pcm_runtime *rtd = substream->private_data; 244 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); 245 struct psc_dma_stream *s; 246 247 dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream); 248 249 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 250 s = &psc_dma->capture; 251 else 252 s = &psc_dma->playback; 253 254 if (!psc_dma->playback.active && 255 !psc_dma->capture.active) { 256 257 /* Disable all interrupts and reset the PSC */ 258 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); 259 out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */ 260 } 261 s->stream = NULL; 262 return 0; 263 } 264 265 static snd_pcm_uframes_t 266 psc_dma_pointer(struct snd_pcm_substream *substream) 267 { 268 struct snd_soc_pcm_runtime *rtd = substream->private_data; 269 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); 270 struct psc_dma_stream *s; 271 dma_addr_t count; 272 273 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 274 s = &psc_dma->capture; 275 else 276 s = &psc_dma->playback; 277 278 count = s->period_current * s->period_bytes; 279 280 return bytes_to_frames(substream->runtime, count); 281 } 282 283 static int 284 psc_dma_hw_params(struct snd_pcm_substream *substream, 285 struct snd_pcm_hw_params *params) 286 { 287 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 288 289 return 0; 290 } 291 292 static struct snd_pcm_ops psc_dma_ops = { 293 .open = psc_dma_open, 294 .close = psc_dma_close, 295 .hw_free = psc_dma_hw_free, 296 .ioctl = snd_pcm_lib_ioctl, 297 .pointer = psc_dma_pointer, 298 .trigger = psc_dma_trigger, 299 .hw_params = psc_dma_hw_params, 300 }; 301 302 static u64 psc_dma_dmamask = DMA_BIT_MASK(32); 303 static int psc_dma_new(struct snd_soc_pcm_runtime *rtd) 304 { 305 struct snd_card *card = rtd->card->snd_card; 306 struct snd_soc_dai *dai = rtd->cpu_dai; 307 struct snd_pcm *pcm = rtd->pcm; 308 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); 309 size_t size = psc_dma_hardware.buffer_bytes_max; 310 int rc = 0; 311 312 dev_dbg(rtd->platform->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n", 313 card, dai, pcm); 314 315 if (!card->dev->dma_mask) 316 card->dev->dma_mask = &psc_dma_dmamask; 317 if (!card->dev->coherent_dma_mask) 318 card->dev->coherent_dma_mask = DMA_BIT_MASK(32); 319 320 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 321 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev, 322 size, &pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer); 323 if (rc) 324 goto playback_alloc_err; 325 } 326 327 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 328 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev, 329 size, &pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->dma_buffer); 330 if (rc) 331 goto capture_alloc_err; 332 } 333 334 if (rtd->codec->ac97) 335 rtd->codec->ac97->private_data = psc_dma; 336 337 return 0; 338 339 capture_alloc_err: 340 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 341 snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer); 342 343 playback_alloc_err: 344 dev_err(card->dev, "Cannot allocate buffer(s)\n"); 345 346 return -ENOMEM; 347 } 348 349 static void psc_dma_free(struct snd_pcm *pcm) 350 { 351 struct snd_soc_pcm_runtime *rtd = pcm->private_data; 352 struct snd_pcm_substream *substream; 353 int stream; 354 355 dev_dbg(rtd->platform->dev, "psc_dma_free(pcm=%p)\n", pcm); 356 357 for (stream = 0; stream < 2; stream++) { 358 substream = pcm->streams[stream].substream; 359 if (substream) { 360 snd_dma_free_pages(&substream->dma_buffer); 361 substream->dma_buffer.area = NULL; 362 substream->dma_buffer.addr = 0; 363 } 364 } 365 } 366 367 static struct snd_soc_platform_driver mpc5200_audio_dma_platform = { 368 .ops = &psc_dma_ops, 369 .pcm_new = &psc_dma_new, 370 .pcm_free = &psc_dma_free, 371 }; 372 373 int mpc5200_audio_dma_create(struct platform_device *op) 374 { 375 phys_addr_t fifo; 376 struct psc_dma *psc_dma; 377 struct resource res; 378 int size, irq, rc; 379 const __be32 *prop; 380 void __iomem *regs; 381 int ret; 382 383 /* Fetch the registers and IRQ of the PSC */ 384 irq = irq_of_parse_and_map(op->dev.of_node, 0); 385 if (of_address_to_resource(op->dev.of_node, 0, &res)) { 386 dev_err(&op->dev, "Missing reg property\n"); 387 return -ENODEV; 388 } 389 regs = ioremap(res.start, resource_size(&res)); 390 if (!regs) { 391 dev_err(&op->dev, "Could not map registers\n"); 392 return -ENODEV; 393 } 394 395 /* Allocate and initialize the driver private data */ 396 psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL); 397 if (!psc_dma) { 398 ret = -ENOMEM; 399 goto out_unmap; 400 } 401 402 /* Get the PSC ID */ 403 prop = of_get_property(op->dev.of_node, "cell-index", &size); 404 if (!prop || size < sizeof *prop) { 405 ret = -ENODEV; 406 goto out_free; 407 } 408 409 spin_lock_init(&psc_dma->lock); 410 mutex_init(&psc_dma->mutex); 411 psc_dma->id = be32_to_cpu(*prop); 412 psc_dma->irq = irq; 413 psc_dma->psc_regs = regs; 414 psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs; 415 psc_dma->dev = &op->dev; 416 psc_dma->playback.psc_dma = psc_dma; 417 psc_dma->capture.psc_dma = psc_dma; 418 snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id); 419 420 /* Find the address of the fifo data registers and setup the 421 * DMA tasks */ 422 fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32); 423 psc_dma->capture.bcom_task = 424 bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512); 425 psc_dma->playback.bcom_task = 426 bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo); 427 if (!psc_dma->capture.bcom_task || 428 !psc_dma->playback.bcom_task) { 429 dev_err(&op->dev, "Could not allocate bestcomm tasks\n"); 430 ret = -ENODEV; 431 goto out_free; 432 } 433 434 /* Disable all interrupts and reset the PSC */ 435 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); 436 /* reset receiver */ 437 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX); 438 /* reset transmitter */ 439 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX); 440 /* reset error */ 441 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT); 442 /* reset mode */ 443 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1); 444 445 /* Set up mode register; 446 * First write: RxRdy (FIFO Alarm) generates rx FIFO irq 447 * Second write: register Normal mode for non loopback 448 */ 449 out_8(&psc_dma->psc_regs->mode, 0); 450 out_8(&psc_dma->psc_regs->mode, 0); 451 452 /* Set the TX and RX fifo alarm thresholds */ 453 out_be16(&psc_dma->fifo_regs->rfalarm, 0x100); 454 out_8(&psc_dma->fifo_regs->rfcntl, 0x4); 455 out_be16(&psc_dma->fifo_regs->tfalarm, 0x100); 456 out_8(&psc_dma->fifo_regs->tfcntl, 0x7); 457 458 /* Lookup the IRQ numbers */ 459 psc_dma->playback.irq = 460 bcom_get_task_irq(psc_dma->playback.bcom_task); 461 psc_dma->capture.irq = 462 bcom_get_task_irq(psc_dma->capture.bcom_task); 463 464 rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED, 465 "psc-dma-status", psc_dma); 466 rc |= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED, 467 "psc-dma-capture", &psc_dma->capture); 468 rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED, 469 "psc-dma-playback", &psc_dma->playback); 470 if (rc) { 471 ret = -ENODEV; 472 goto out_irq; 473 } 474 475 /* Save what we've done so it can be found again later */ 476 dev_set_drvdata(&op->dev, psc_dma); 477 478 /* Tell the ASoC OF helpers about it */ 479 return snd_soc_register_platform(&op->dev, &mpc5200_audio_dma_platform); 480 out_irq: 481 free_irq(psc_dma->irq, psc_dma); 482 free_irq(psc_dma->capture.irq, &psc_dma->capture); 483 free_irq(psc_dma->playback.irq, &psc_dma->playback); 484 out_free: 485 kfree(psc_dma); 486 out_unmap: 487 iounmap(regs); 488 return ret; 489 } 490 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create); 491 492 int mpc5200_audio_dma_destroy(struct platform_device *op) 493 { 494 struct psc_dma *psc_dma = dev_get_drvdata(&op->dev); 495 496 dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n"); 497 498 snd_soc_unregister_platform(&op->dev); 499 500 bcom_gen_bd_rx_release(psc_dma->capture.bcom_task); 501 bcom_gen_bd_tx_release(psc_dma->playback.bcom_task); 502 503 /* Release irqs */ 504 free_irq(psc_dma->irq, psc_dma); 505 free_irq(psc_dma->capture.irq, &psc_dma->capture); 506 free_irq(psc_dma->playback.irq, &psc_dma->playback); 507 508 iounmap(psc_dma->psc_regs); 509 kfree(psc_dma); 510 dev_set_drvdata(&op->dev, NULL); 511 512 return 0; 513 } 514 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy); 515 516 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); 517 MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver"); 518 MODULE_LICENSE("GPL"); 519