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 13 #include <sound/soc.h> 14 15 #include <sysdev/bestcomm/bestcomm.h> 16 #include <sysdev/bestcomm/gen_bd.h> 17 #include <asm/mpc52xx_psc.h> 18 19 #include "mpc5200_dma.h" 20 21 /* 22 * Interrupt handlers 23 */ 24 static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma) 25 { 26 struct psc_dma *psc_dma = _psc_dma; 27 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; 28 u16 isr; 29 30 isr = in_be16(®s->mpc52xx_psc_isr); 31 32 /* Playback underrun error */ 33 if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP)) 34 psc_dma->stats.underrun_count++; 35 36 /* Capture overrun error */ 37 if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR)) 38 psc_dma->stats.overrun_count++; 39 40 out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT); 41 42 return IRQ_HANDLED; 43 } 44 45 /** 46 * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer 47 * @s: pointer to stream private data structure 48 * 49 * Enqueues another audio period buffer into the bestcomm queue. 50 * 51 * Note: The routine must only be called when there is space available in 52 * the queue. Otherwise the enqueue will fail and the audio ring buffer 53 * will get out of sync 54 */ 55 static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s) 56 { 57 struct bcom_bd *bd; 58 59 /* Prepare and enqueue the next buffer descriptor */ 60 bd = bcom_prepare_next_buffer(s->bcom_task); 61 bd->status = s->period_bytes; 62 bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes); 63 bcom_submit_next_buffer(s->bcom_task, NULL); 64 65 /* Update for next period */ 66 s->period_next = (s->period_next + 1) % s->runtime->periods; 67 } 68 69 /* Bestcomm DMA irq handler */ 70 static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream) 71 { 72 struct psc_dma_stream *s = _psc_dma_stream; 73 74 spin_lock(&s->psc_dma->lock); 75 /* For each finished period, dequeue the completed period buffer 76 * and enqueue a new one in it's place. */ 77 while (bcom_buffer_done(s->bcom_task)) { 78 bcom_retrieve_buffer(s->bcom_task, NULL, NULL); 79 80 s->period_current = (s->period_current+1) % s->runtime->periods; 81 s->period_count++; 82 83 psc_dma_bcom_enqueue_next_buffer(s); 84 } 85 spin_unlock(&s->psc_dma->lock); 86 87 /* If the stream is active, then also inform the PCM middle layer 88 * of the period finished event. */ 89 if (s->active) 90 snd_pcm_period_elapsed(s->stream); 91 92 return IRQ_HANDLED; 93 } 94 95 static int psc_dma_hw_free(struct snd_pcm_substream *substream) 96 { 97 snd_pcm_set_runtime_buffer(substream, NULL); 98 return 0; 99 } 100 101 /** 102 * psc_dma_trigger: start and stop the DMA transfer. 103 * 104 * This function is called by ALSA to start, stop, pause, and resume the DMA 105 * transfer of data. 106 */ 107 static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd) 108 { 109 struct snd_soc_pcm_runtime *rtd = substream->private_data; 110 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; 111 struct snd_pcm_runtime *runtime = substream->runtime; 112 struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); 113 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; 114 u16 imr; 115 unsigned long flags; 116 int i; 117 118 switch (cmd) { 119 case SNDRV_PCM_TRIGGER_START: 120 dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n", 121 substream->pstr->stream, runtime->frame_bits, 122 (int)runtime->period_size, runtime->periods); 123 s->period_bytes = frames_to_bytes(runtime, 124 runtime->period_size); 125 s->period_next = 0; 126 s->period_current = 0; 127 s->active = 1; 128 s->period_count = 0; 129 s->runtime = runtime; 130 131 /* Fill up the bestcomm bd queue and enable DMA. 132 * This will begin filling the PSC's fifo. 133 */ 134 spin_lock_irqsave(&psc_dma->lock, flags); 135 136 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 137 bcom_gen_bd_rx_reset(s->bcom_task); 138 else 139 bcom_gen_bd_tx_reset(s->bcom_task); 140 141 for (i = 0; i < runtime->periods; i++) 142 if (!bcom_queue_full(s->bcom_task)) 143 psc_dma_bcom_enqueue_next_buffer(s); 144 145 bcom_enable(s->bcom_task); 146 spin_unlock_irqrestore(&psc_dma->lock, flags); 147 148 out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT); 149 150 break; 151 152 case SNDRV_PCM_TRIGGER_STOP: 153 dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n", 154 substream->pstr->stream, s->period_count); 155 s->active = 0; 156 157 spin_lock_irqsave(&psc_dma->lock, flags); 158 bcom_disable(s->bcom_task); 159 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 160 bcom_gen_bd_rx_reset(s->bcom_task); 161 else 162 bcom_gen_bd_tx_reset(s->bcom_task); 163 spin_unlock_irqrestore(&psc_dma->lock, flags); 164 165 break; 166 167 default: 168 dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n", 169 substream->pstr->stream, cmd); 170 return -EINVAL; 171 } 172 173 /* Update interrupt enable settings */ 174 imr = 0; 175 if (psc_dma->playback.active) 176 imr |= MPC52xx_PSC_IMR_TXEMP; 177 if (psc_dma->capture.active) 178 imr |= MPC52xx_PSC_IMR_ORERR; 179 out_be16(®s->isr_imr.imr, psc_dma->imr | imr); 180 181 return 0; 182 } 183 184 185 /* --------------------------------------------------------------------- 186 * The PSC DMA 'ASoC platform' driver 187 * 188 * Can be referenced by an 'ASoC machine' driver 189 * This driver only deals with the audio bus; it doesn't have any 190 * interaction with the attached codec 191 */ 192 193 static const struct snd_pcm_hardware psc_dma_hardware = { 194 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | 195 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | 196 SNDRV_PCM_INFO_BATCH, 197 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | 198 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE, 199 .rate_min = 8000, 200 .rate_max = 48000, 201 .channels_min = 1, 202 .channels_max = 2, 203 .period_bytes_max = 1024 * 1024, 204 .period_bytes_min = 32, 205 .periods_min = 2, 206 .periods_max = 256, 207 .buffer_bytes_max = 2 * 1024 * 1024, 208 .fifo_size = 512, 209 }; 210 211 static int psc_dma_open(struct snd_pcm_substream *substream) 212 { 213 struct snd_pcm_runtime *runtime = substream->runtime; 214 struct snd_soc_pcm_runtime *rtd = substream->private_data; 215 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; 216 struct psc_dma_stream *s; 217 int rc; 218 219 dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream); 220 221 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 222 s = &psc_dma->capture; 223 else 224 s = &psc_dma->playback; 225 226 snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware); 227 228 rc = snd_pcm_hw_constraint_integer(runtime, 229 SNDRV_PCM_HW_PARAM_PERIODS); 230 if (rc < 0) { 231 dev_err(substream->pcm->card->dev, "invalid buffer size\n"); 232 return rc; 233 } 234 235 s->stream = substream; 236 return 0; 237 } 238 239 static int psc_dma_close(struct snd_pcm_substream *substream) 240 { 241 struct snd_soc_pcm_runtime *rtd = substream->private_data; 242 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; 243 struct psc_dma_stream *s; 244 245 dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream); 246 247 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 248 s = &psc_dma->capture; 249 else 250 s = &psc_dma->playback; 251 252 if (!psc_dma->playback.active && 253 !psc_dma->capture.active) { 254 255 /* Disable all interrupts and reset the PSC */ 256 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); 257 out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */ 258 } 259 s->stream = NULL; 260 return 0; 261 } 262 263 static snd_pcm_uframes_t 264 psc_dma_pointer(struct snd_pcm_substream *substream) 265 { 266 struct snd_soc_pcm_runtime *rtd = substream->private_data; 267 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; 268 struct psc_dma_stream *s; 269 dma_addr_t count; 270 271 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) 272 s = &psc_dma->capture; 273 else 274 s = &psc_dma->playback; 275 276 count = s->period_current * s->period_bytes; 277 278 return bytes_to_frames(substream->runtime, count); 279 } 280 281 static int 282 psc_dma_hw_params(struct snd_pcm_substream *substream, 283 struct snd_pcm_hw_params *params) 284 { 285 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 286 287 return 0; 288 } 289 290 static struct snd_pcm_ops psc_dma_ops = { 291 .open = psc_dma_open, 292 .close = psc_dma_close, 293 .hw_free = psc_dma_hw_free, 294 .ioctl = snd_pcm_lib_ioctl, 295 .pointer = psc_dma_pointer, 296 .trigger = psc_dma_trigger, 297 .hw_params = psc_dma_hw_params, 298 }; 299 300 static u64 psc_dma_dmamask = 0xffffffff; 301 static int psc_dma_new(struct snd_card *card, struct snd_soc_dai *dai, 302 struct snd_pcm *pcm) 303 { 304 struct snd_soc_pcm_runtime *rtd = pcm->private_data; 305 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; 306 size_t size = psc_dma_hardware.buffer_bytes_max; 307 int rc = 0; 308 309 dev_dbg(rtd->socdev->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n", 310 card, dai, pcm); 311 312 if (!card->dev->dma_mask) 313 card->dev->dma_mask = &psc_dma_dmamask; 314 if (!card->dev->coherent_dma_mask) 315 card->dev->coherent_dma_mask = 0xffffffff; 316 317 if (pcm->streams[0].substream) { 318 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev, 319 size, &pcm->streams[0].substream->dma_buffer); 320 if (rc) 321 goto playback_alloc_err; 322 } 323 324 if (pcm->streams[1].substream) { 325 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev, 326 size, &pcm->streams[1].substream->dma_buffer); 327 if (rc) 328 goto capture_alloc_err; 329 } 330 331 if (rtd->socdev->card->codec->ac97) 332 rtd->socdev->card->codec->ac97->private_data = psc_dma; 333 334 return 0; 335 336 capture_alloc_err: 337 if (pcm->streams[0].substream) 338 snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer); 339 340 playback_alloc_err: 341 dev_err(card->dev, "Cannot allocate buffer(s)\n"); 342 343 return -ENOMEM; 344 } 345 346 static void psc_dma_free(struct snd_pcm *pcm) 347 { 348 struct snd_soc_pcm_runtime *rtd = pcm->private_data; 349 struct snd_pcm_substream *substream; 350 int stream; 351 352 dev_dbg(rtd->socdev->dev, "psc_dma_free(pcm=%p)\n", pcm); 353 354 for (stream = 0; stream < 2; stream++) { 355 substream = pcm->streams[stream].substream; 356 if (substream) { 357 snd_dma_free_pages(&substream->dma_buffer); 358 substream->dma_buffer.area = NULL; 359 substream->dma_buffer.addr = 0; 360 } 361 } 362 } 363 364 struct snd_soc_platform mpc5200_audio_dma_platform = { 365 .name = "mpc5200-psc-audio", 366 .pcm_ops = &psc_dma_ops, 367 .pcm_new = &psc_dma_new, 368 .pcm_free = &psc_dma_free, 369 }; 370 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_platform); 371 372 int mpc5200_audio_dma_create(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, 1 + res.end - res.start); 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(&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 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create); 490 491 int mpc5200_audio_dma_destroy(struct platform_device *op) 492 { 493 struct psc_dma *psc_dma = dev_get_drvdata(&op->dev); 494 495 dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n"); 496 497 snd_soc_unregister_platform(&mpc5200_audio_dma_platform); 498 499 bcom_gen_bd_rx_release(psc_dma->capture.bcom_task); 500 bcom_gen_bd_tx_release(psc_dma->playback.bcom_task); 501 502 /* Release irqs */ 503 free_irq(psc_dma->irq, psc_dma); 504 free_irq(psc_dma->capture.irq, &psc_dma->capture); 505 free_irq(psc_dma->playback.irq, &psc_dma->playback); 506 507 iounmap(psc_dma->psc_regs); 508 kfree(psc_dma); 509 dev_set_drvdata(&op->dev, NULL); 510 511 return 0; 512 } 513 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy); 514 515 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); 516 MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver"); 517 MODULE_LICENSE("GPL"); 518