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/slab.h> 12 #include <linux/of_platform.h> 13 14 #include <sound/soc.h> 15 16 #include <sysdev/bestcomm/bestcomm.h> 17 #include <sysdev/bestcomm/gen_bd.h> 18 #include <asm/mpc52xx_psc.h> 19 20 #include "mpc5200_dma.h" 21 22 /* 23 * Interrupt handlers 24 */ 25 static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma) 26 { 27 struct psc_dma *psc_dma = _psc_dma; 28 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; 29 u16 isr; 30 31 isr = in_be16(®s->mpc52xx_psc_isr); 32 33 /* Playback underrun error */ 34 if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP)) 35 psc_dma->stats.underrun_count++; 36 37 /* Capture overrun error */ 38 if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR)) 39 psc_dma->stats.overrun_count++; 40 41 out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT); 42 43 return IRQ_HANDLED; 44 } 45 46 /** 47 * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer 48 * @s: pointer to stream private data structure 49 * 50 * Enqueues another audio period buffer into the bestcomm queue. 51 * 52 * Note: The routine must only be called when there is space available in 53 * the queue. Otherwise the enqueue will fail and the audio ring buffer 54 * will get out of sync 55 */ 56 static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s) 57 { 58 struct bcom_bd *bd; 59 60 /* Prepare and enqueue the next buffer descriptor */ 61 bd = bcom_prepare_next_buffer(s->bcom_task); 62 bd->status = s->period_bytes; 63 bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes); 64 bcom_submit_next_buffer(s->bcom_task, NULL); 65 66 /* Update for next period */ 67 s->period_next = (s->period_next + 1) % s->runtime->periods; 68 } 69 70 /* Bestcomm DMA irq handler */ 71 static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream) 72 { 73 struct psc_dma_stream *s = _psc_dma_stream; 74 75 spin_lock(&s->psc_dma->lock); 76 /* For each finished period, dequeue the completed period buffer 77 * and enqueue a new one in it's place. */ 78 while (bcom_buffer_done(s->bcom_task)) { 79 bcom_retrieve_buffer(s->bcom_task, NULL, NULL); 80 81 s->period_current = (s->period_current+1) % s->runtime->periods; 82 s->period_count++; 83 84 psc_dma_bcom_enqueue_next_buffer(s); 85 } 86 spin_unlock(&s->psc_dma->lock); 87 88 /* If the stream is active, then also inform the PCM middle layer 89 * of the period finished event. */ 90 if (s->active) 91 snd_pcm_period_elapsed(s->stream); 92 93 return IRQ_HANDLED; 94 } 95 96 static int psc_dma_hw_free(struct snd_pcm_substream *substream) 97 { 98 snd_pcm_set_runtime_buffer(substream, NULL); 99 return 0; 100 } 101 102 /** 103 * psc_dma_trigger: start and stop the DMA transfer. 104 * 105 * This function is called by ALSA to start, stop, pause, and resume the DMA 106 * transfer of data. 107 */ 108 static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd) 109 { 110 struct snd_soc_pcm_runtime *rtd = substream->private_data; 111 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); 112 struct snd_pcm_runtime *runtime = substream->runtime; 113 struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); 114 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; 115 u16 imr; 116 unsigned long flags; 117 int i; 118 119 switch (cmd) { 120 case SNDRV_PCM_TRIGGER_START: 121 dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n", 122 substream->pstr->stream, runtime->frame_bits, 123 (int)runtime->period_size, runtime->periods); 124 s->period_bytes = frames_to_bytes(runtime, 125 runtime->period_size); 126 s->period_next = 0; 127 s->period_current = 0; 128 s->active = 1; 129 s->period_count = 0; 130 s->runtime = runtime; 131 132 /* Fill up the bestcomm bd queue and enable DMA. 133 * This will begin filling the PSC's fifo. 134 */ 135 spin_lock_irqsave(&psc_dma->lock, flags); 136 137 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 138 bcom_gen_bd_rx_reset(s->bcom_task); 139 else 140 bcom_gen_bd_tx_reset(s->bcom_task); 141 142 for (i = 0; i < runtime->periods; i++) 143 if (!bcom_queue_full(s->bcom_task)) 144 psc_dma_bcom_enqueue_next_buffer(s); 145 146 bcom_enable(s->bcom_task); 147 spin_unlock_irqrestore(&psc_dma->lock, flags); 148 149 out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT); 150 151 break; 152 153 case SNDRV_PCM_TRIGGER_STOP: 154 dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n", 155 substream->pstr->stream, s->period_count); 156 s->active = 0; 157 158 spin_lock_irqsave(&psc_dma->lock, flags); 159 bcom_disable(s->bcom_task); 160 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 161 bcom_gen_bd_rx_reset(s->bcom_task); 162 else 163 bcom_gen_bd_tx_reset(s->bcom_task); 164 spin_unlock_irqrestore(&psc_dma->lock, flags); 165 166 break; 167 168 default: 169 dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n", 170 substream->pstr->stream, cmd); 171 return -EINVAL; 172 } 173 174 /* Update interrupt enable settings */ 175 imr = 0; 176 if (psc_dma->playback.active) 177 imr |= MPC52xx_PSC_IMR_TXEMP; 178 if (psc_dma->capture.active) 179 imr |= MPC52xx_PSC_IMR_ORERR; 180 out_be16(®s->isr_imr.imr, psc_dma->imr | imr); 181 182 return 0; 183 } 184 185 186 /* --------------------------------------------------------------------- 187 * The PSC DMA 'ASoC platform' driver 188 * 189 * Can be referenced by an 'ASoC machine' driver 190 * This driver only deals with the audio bus; it doesn't have any 191 * interaction with the attached codec 192 */ 193 194 static const struct snd_pcm_hardware psc_dma_hardware = { 195 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | 196 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | 197 SNDRV_PCM_INFO_BATCH, 198 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | 199 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE, 200 .rate_min = 8000, 201 .rate_max = 48000, 202 .channels_min = 1, 203 .channels_max = 2, 204 .period_bytes_max = 1024 * 1024, 205 .period_bytes_min = 32, 206 .periods_min = 2, 207 .periods_max = 256, 208 .buffer_bytes_max = 2 * 1024 * 1024, 209 .fifo_size = 512, 210 }; 211 212 static int psc_dma_open(struct snd_pcm_substream *substream) 213 { 214 struct snd_pcm_runtime *runtime = substream->runtime; 215 struct snd_soc_pcm_runtime *rtd = substream->private_data; 216 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); 217 struct psc_dma_stream *s; 218 int rc; 219 220 dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream); 221 222 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 223 s = &psc_dma->capture; 224 else 225 s = &psc_dma->playback; 226 227 snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware); 228 229 rc = snd_pcm_hw_constraint_integer(runtime, 230 SNDRV_PCM_HW_PARAM_PERIODS); 231 if (rc < 0) { 232 dev_err(substream->pcm->card->dev, "invalid buffer size\n"); 233 return rc; 234 } 235 236 s->stream = substream; 237 return 0; 238 } 239 240 static int psc_dma_close(struct snd_pcm_substream *substream) 241 { 242 struct snd_soc_pcm_runtime *rtd = substream->private_data; 243 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); 244 struct psc_dma_stream *s; 245 246 dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream); 247 248 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 249 s = &psc_dma->capture; 250 else 251 s = &psc_dma->playback; 252 253 if (!psc_dma->playback.active && 254 !psc_dma->capture.active) { 255 256 /* Disable all interrupts and reset the PSC */ 257 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); 258 out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */ 259 } 260 s->stream = NULL; 261 return 0; 262 } 263 264 static snd_pcm_uframes_t 265 psc_dma_pointer(struct snd_pcm_substream *substream) 266 { 267 struct snd_soc_pcm_runtime *rtd = substream->private_data; 268 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); 269 struct psc_dma_stream *s; 270 dma_addr_t count; 271 272 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 273 s = &psc_dma->capture; 274 else 275 s = &psc_dma->playback; 276 277 count = s->period_current * s->period_bytes; 278 279 return bytes_to_frames(substream->runtime, count); 280 } 281 282 static int 283 psc_dma_hw_params(struct snd_pcm_substream *substream, 284 struct snd_pcm_hw_params *params) 285 { 286 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 287 288 return 0; 289 } 290 291 static struct snd_pcm_ops psc_dma_ops = { 292 .open = psc_dma_open, 293 .close = psc_dma_close, 294 .hw_free = psc_dma_hw_free, 295 .ioctl = snd_pcm_lib_ioctl, 296 .pointer = psc_dma_pointer, 297 .trigger = psc_dma_trigger, 298 .hw_params = psc_dma_hw_params, 299 }; 300 301 static u64 psc_dma_dmamask = 0xffffffff; 302 static int psc_dma_new(struct snd_soc_pcm_runtime *rtd) 303 { 304 struct snd_card *card = rtd->card->snd_card; 305 struct snd_soc_dai *dai = rtd->cpu_dai; 306 struct snd_pcm *pcm = rtd->pcm; 307 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); 308 size_t size = psc_dma_hardware.buffer_bytes_max; 309 int rc = 0; 310 311 dev_dbg(rtd->platform->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n", 312 card, dai, pcm); 313 314 if (!card->dev->dma_mask) 315 card->dev->dma_mask = &psc_dma_dmamask; 316 if (!card->dev->coherent_dma_mask) 317 card->dev->coherent_dma_mask = 0xffffffff; 318 319 if (pcm->streams[0].substream) { 320 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev, 321 size, &pcm->streams[0].substream->dma_buffer); 322 if (rc) 323 goto playback_alloc_err; 324 } 325 326 if (pcm->streams[1].substream) { 327 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev, 328 size, &pcm->streams[1].substream->dma_buffer); 329 if (rc) 330 goto capture_alloc_err; 331 } 332 333 if (rtd->codec->ac97) 334 rtd->codec->ac97->private_data = psc_dma; 335 336 return 0; 337 338 capture_alloc_err: 339 if (pcm->streams[0].substream) 340 snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer); 341 342 playback_alloc_err: 343 dev_err(card->dev, "Cannot allocate buffer(s)\n"); 344 345 return -ENOMEM; 346 } 347 348 static void psc_dma_free(struct snd_pcm *pcm) 349 { 350 struct snd_soc_pcm_runtime *rtd = pcm->private_data; 351 struct snd_pcm_substream *substream; 352 int stream; 353 354 dev_dbg(rtd->platform->dev, "psc_dma_free(pcm=%p)\n", pcm); 355 356 for (stream = 0; stream < 2; stream++) { 357 substream = pcm->streams[stream].substream; 358 if (substream) { 359 snd_dma_free_pages(&substream->dma_buffer); 360 substream->dma_buffer.area = NULL; 361 substream->dma_buffer.addr = 0; 362 } 363 } 364 } 365 366 static struct snd_soc_platform_driver mpc5200_audio_dma_platform = { 367 .ops = &psc_dma_ops, 368 .pcm_new = &psc_dma_new, 369 .pcm_free = &psc_dma_free, 370 }; 371 372 static int mpc5200_hpcd_probe(struct platform_device *op) 373 { 374 phys_addr_t fifo; 375 struct psc_dma *psc_dma; 376 struct resource res; 377 int size, irq, rc; 378 const __be32 *prop; 379 void __iomem *regs; 380 int ret; 381 382 /* Fetch the registers and IRQ of the PSC */ 383 irq = irq_of_parse_and_map(op->dev.of_node, 0); 384 if (of_address_to_resource(op->dev.of_node, 0, &res)) { 385 dev_err(&op->dev, "Missing reg property\n"); 386 return -ENODEV; 387 } 388 regs = ioremap(res.start, resource_size(&res)); 389 if (!regs) { 390 dev_err(&op->dev, "Could not map registers\n"); 391 return -ENODEV; 392 } 393 394 /* Allocate and initialize the driver private data */ 395 psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL); 396 if (!psc_dma) { 397 ret = -ENOMEM; 398 goto out_unmap; 399 } 400 401 /* Get the PSC ID */ 402 prop = of_get_property(op->dev.of_node, "cell-index", &size); 403 if (!prop || size < sizeof *prop) { 404 ret = -ENODEV; 405 goto out_free; 406 } 407 408 spin_lock_init(&psc_dma->lock); 409 mutex_init(&psc_dma->mutex); 410 psc_dma->id = be32_to_cpu(*prop); 411 psc_dma->irq = irq; 412 psc_dma->psc_regs = regs; 413 psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs; 414 psc_dma->dev = &op->dev; 415 psc_dma->playback.psc_dma = psc_dma; 416 psc_dma->capture.psc_dma = psc_dma; 417 snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id); 418 419 /* Find the address of the fifo data registers and setup the 420 * DMA tasks */ 421 fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32); 422 psc_dma->capture.bcom_task = 423 bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512); 424 psc_dma->playback.bcom_task = 425 bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo); 426 if (!psc_dma->capture.bcom_task || 427 !psc_dma->playback.bcom_task) { 428 dev_err(&op->dev, "Could not allocate bestcomm tasks\n"); 429 ret = -ENODEV; 430 goto out_free; 431 } 432 433 /* Disable all interrupts and reset the PSC */ 434 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); 435 /* reset receiver */ 436 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX); 437 /* reset transmitter */ 438 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX); 439 /* reset error */ 440 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT); 441 /* reset mode */ 442 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1); 443 444 /* Set up mode register; 445 * First write: RxRdy (FIFO Alarm) generates rx FIFO irq 446 * Second write: register Normal mode for non loopback 447 */ 448 out_8(&psc_dma->psc_regs->mode, 0); 449 out_8(&psc_dma->psc_regs->mode, 0); 450 451 /* Set the TX and RX fifo alarm thresholds */ 452 out_be16(&psc_dma->fifo_regs->rfalarm, 0x100); 453 out_8(&psc_dma->fifo_regs->rfcntl, 0x4); 454 out_be16(&psc_dma->fifo_regs->tfalarm, 0x100); 455 out_8(&psc_dma->fifo_regs->tfcntl, 0x7); 456 457 /* Lookup the IRQ numbers */ 458 psc_dma->playback.irq = 459 bcom_get_task_irq(psc_dma->playback.bcom_task); 460 psc_dma->capture.irq = 461 bcom_get_task_irq(psc_dma->capture.bcom_task); 462 463 rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED, 464 "psc-dma-status", psc_dma); 465 rc |= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED, 466 "psc-dma-capture", &psc_dma->capture); 467 rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED, 468 "psc-dma-playback", &psc_dma->playback); 469 if (rc) { 470 ret = -ENODEV; 471 goto out_irq; 472 } 473 474 /* Save what we've done so it can be found again later */ 475 dev_set_drvdata(&op->dev, psc_dma); 476 477 /* Tell the ASoC OF helpers about it */ 478 return snd_soc_register_platform(&op->dev, &mpc5200_audio_dma_platform); 479 out_irq: 480 free_irq(psc_dma->irq, psc_dma); 481 free_irq(psc_dma->capture.irq, &psc_dma->capture); 482 free_irq(psc_dma->playback.irq, &psc_dma->playback); 483 out_free: 484 kfree(psc_dma); 485 out_unmap: 486 iounmap(regs); 487 return ret; 488 } 489 490 static int mpc5200_hpcd_remove(struct platform_device *op) 491 { 492 struct psc_dma *psc_dma = dev_get_drvdata(&op->dev); 493 494 dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n"); 495 496 snd_soc_unregister_platform(&op->dev); 497 498 bcom_gen_bd_rx_release(psc_dma->capture.bcom_task); 499 bcom_gen_bd_tx_release(psc_dma->playback.bcom_task); 500 501 /* Release irqs */ 502 free_irq(psc_dma->irq, psc_dma); 503 free_irq(psc_dma->capture.irq, &psc_dma->capture); 504 free_irq(psc_dma->playback.irq, &psc_dma->playback); 505 506 iounmap(psc_dma->psc_regs); 507 kfree(psc_dma); 508 dev_set_drvdata(&op->dev, NULL); 509 510 return 0; 511 } 512 513 static struct of_device_id mpc5200_hpcd_match[] = { 514 { .compatible = "fsl,mpc5200-pcm", }, 515 {} 516 }; 517 MODULE_DEVICE_TABLE(of, mpc5200_hpcd_match); 518 519 static struct platform_driver mpc5200_hpcd_of_driver = { 520 .probe = mpc5200_hpcd_probe, 521 .remove = mpc5200_hpcd_remove, 522 .driver = { 523 .owner = THIS_MODULE, 524 .name = "mpc5200-pcm-audio", 525 .of_match_table = mpc5200_hpcd_match, 526 } 527 }; 528 529 module_platform_driver(mpc5200_hpcd_of_driver); 530 531 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); 532 MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver"); 533 MODULE_LICENSE("GPL"); 534