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Linux/sound/soc/fsl/mpc5200_dma.c

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  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_address.h>
 14 #include <linux/of_irq.h>
 15 #include <linux/of_platform.h>
 16 
 17 #include <sound/soc.h>
 18 
 19 #include <linux/fsl/bestcomm/bestcomm.h>
 20 #include <linux/fsl/bestcomm/gen_bd.h>
 21 #include <asm/mpc52xx_psc.h>
 22 
 23 #include "mpc5200_dma.h"
 24 
 25 #define DRV_NAME "mpc5200_dma"
 26 
 27 /*
 28  * Interrupt handlers
 29  */
 30 static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
 31 {
 32         struct psc_dma *psc_dma = _psc_dma;
 33         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 34         u16 isr;
 35 
 36         isr = in_be16(&regs->mpc52xx_psc_isr);
 37 
 38         /* Playback underrun error */
 39         if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
 40                 psc_dma->stats.underrun_count++;
 41 
 42         /* Capture overrun error */
 43         if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
 44                 psc_dma->stats.overrun_count++;
 45 
 46         out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
 47 
 48         return IRQ_HANDLED;
 49 }
 50 
 51 /**
 52  * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
 53  * @s: pointer to stream private data structure
 54  *
 55  * Enqueues another audio period buffer into the bestcomm queue.
 56  *
 57  * Note: The routine must only be called when there is space available in
 58  * the queue.  Otherwise the enqueue will fail and the audio ring buffer
 59  * will get out of sync
 60  */
 61 static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
 62 {
 63         struct bcom_bd *bd;
 64 
 65         /* Prepare and enqueue the next buffer descriptor */
 66         bd = bcom_prepare_next_buffer(s->bcom_task);
 67         bd->status = s->period_bytes;
 68         bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes);
 69         bcom_submit_next_buffer(s->bcom_task, NULL);
 70 
 71         /* Update for next period */
 72         s->period_next = (s->period_next + 1) % s->runtime->periods;
 73 }
 74 
 75 /* Bestcomm DMA irq handler */
 76 static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream)
 77 {
 78         struct psc_dma_stream *s = _psc_dma_stream;
 79 
 80         spin_lock(&s->psc_dma->lock);
 81         /* For each finished period, dequeue the completed period buffer
 82          * and enqueue a new one in it's place. */
 83         while (bcom_buffer_done(s->bcom_task)) {
 84                 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
 85 
 86                 s->period_current = (s->period_current+1) % s->runtime->periods;
 87                 s->period_count++;
 88 
 89                 psc_dma_bcom_enqueue_next_buffer(s);
 90         }
 91         spin_unlock(&s->psc_dma->lock);
 92 
 93         /* If the stream is active, then also inform the PCM middle layer
 94          * of the period finished event. */
 95         if (s->active)
 96                 snd_pcm_period_elapsed(s->stream);
 97 
 98         return IRQ_HANDLED;
 99 }
100 
101 static int psc_dma_hw_free(struct snd_pcm_substream *substream)
102 {
103         snd_pcm_set_runtime_buffer(substream, NULL);
104         return 0;
105 }
106 
107 /**
108  * psc_dma_trigger: start and stop the DMA transfer.
109  *
110  * This function is called by ALSA to start, stop, pause, and resume the DMA
111  * transfer of data.
112  */
113 static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
114 {
115         struct snd_soc_pcm_runtime *rtd = substream->private_data;
116         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
117         struct snd_pcm_runtime *runtime = substream->runtime;
118         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
119         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
120         u16 imr;
121         unsigned long flags;
122         int i;
123 
124         switch (cmd) {
125         case SNDRV_PCM_TRIGGER_START:
126                 dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n",
127                         substream->pstr->stream, runtime->frame_bits,
128                         (int)runtime->period_size, runtime->periods);
129                 s->period_bytes = frames_to_bytes(runtime,
130                                                   runtime->period_size);
131                 s->period_next = 0;
132                 s->period_current = 0;
133                 s->active = 1;
134                 s->period_count = 0;
135                 s->runtime = runtime;
136 
137                 /* Fill up the bestcomm bd queue and enable DMA.
138                  * This will begin filling the PSC's fifo.
139                  */
140                 spin_lock_irqsave(&psc_dma->lock, flags);
141 
142                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
143                         bcom_gen_bd_rx_reset(s->bcom_task);
144                 else
145                         bcom_gen_bd_tx_reset(s->bcom_task);
146 
147                 for (i = 0; i < runtime->periods; i++)
148                         if (!bcom_queue_full(s->bcom_task))
149                                 psc_dma_bcom_enqueue_next_buffer(s);
150 
151                 bcom_enable(s->bcom_task);
152                 spin_unlock_irqrestore(&psc_dma->lock, flags);
153 
154                 out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
155 
156                 break;
157 
158         case SNDRV_PCM_TRIGGER_STOP:
159                 dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n",
160                         substream->pstr->stream, s->period_count);
161                 s->active = 0;
162 
163                 spin_lock_irqsave(&psc_dma->lock, flags);
164                 bcom_disable(s->bcom_task);
165                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
166                         bcom_gen_bd_rx_reset(s->bcom_task);
167                 else
168                         bcom_gen_bd_tx_reset(s->bcom_task);
169                 spin_unlock_irqrestore(&psc_dma->lock, flags);
170 
171                 break;
172 
173         default:
174                 dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n",
175                         substream->pstr->stream, cmd);
176                 return -EINVAL;
177         }
178 
179         /* Update interrupt enable settings */
180         imr = 0;
181         if (psc_dma->playback.active)
182                 imr |= MPC52xx_PSC_IMR_TXEMP;
183         if (psc_dma->capture.active)
184                 imr |= MPC52xx_PSC_IMR_ORERR;
185         out_be16(&regs->isr_imr.imr, psc_dma->imr | imr);
186 
187         return 0;
188 }
189 
190 
191 /* ---------------------------------------------------------------------
192  * The PSC DMA 'ASoC platform' driver
193  *
194  * Can be referenced by an 'ASoC machine' driver
195  * This driver only deals with the audio bus; it doesn't have any
196  * interaction with the attached codec
197  */
198 
199 static const struct snd_pcm_hardware psc_dma_hardware = {
200         .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
201                 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
202                 SNDRV_PCM_INFO_BATCH,
203         .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
204                 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
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 const 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 int psc_dma_new(struct snd_soc_pcm_runtime *rtd)
303 {
304         struct snd_card *card = rtd->card->snd_card;
305         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
306         struct snd_soc_dai *dai = rtd->cpu_dai;
307         struct snd_pcm *pcm = rtd->pcm;
308         size_t size = psc_dma_hardware.buffer_bytes_max;
309         int rc;
310 
311         dev_dbg(component->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
312                 card, dai, pcm);
313 
314         rc = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
315         if (rc)
316                 return rc;
317 
318         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
319                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
320                                 size, &pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
321                 if (rc)
322                         goto playback_alloc_err;
323         }
324 
325         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
326                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
327                                 size, &pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->dma_buffer);
328                 if (rc)
329                         goto capture_alloc_err;
330         }
331 
332         return 0;
333 
334  capture_alloc_err:
335         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
336                 snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
337 
338  playback_alloc_err:
339         dev_err(card->dev, "Cannot allocate buffer(s)\n");
340 
341         return -ENOMEM;
342 }
343 
344 static void psc_dma_free(struct snd_pcm *pcm)
345 {
346         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
347         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
348         struct snd_pcm_substream *substream;
349         int stream;
350 
351         dev_dbg(component->dev, "psc_dma_free(pcm=%p)\n", pcm);
352 
353         for (stream = 0; stream < 2; stream++) {
354                 substream = pcm->streams[stream].substream;
355                 if (substream) {
356                         snd_dma_free_pages(&substream->dma_buffer);
357                         substream->dma_buffer.area = NULL;
358                         substream->dma_buffer.addr = 0;
359                 }
360         }
361 }
362 
363 static const struct snd_soc_component_driver mpc5200_audio_dma_component = {
364         .name           = DRV_NAME,
365         .ops            = &psc_dma_ops,
366         .pcm_new        = &psc_dma_new,
367         .pcm_free       = &psc_dma_free,
368 };
369 
370 int mpc5200_audio_dma_create(struct platform_device *op)
371 {
372         phys_addr_t fifo;
373         struct psc_dma *psc_dma;
374         struct resource res;
375         int size, irq, rc;
376         const __be32 *prop;
377         void __iomem *regs;
378         int ret;
379 
380         /* Fetch the registers and IRQ of the PSC */
381         irq = irq_of_parse_and_map(op->dev.of_node, 0);
382         if (of_address_to_resource(op->dev.of_node, 0, &res)) {
383                 dev_err(&op->dev, "Missing reg property\n");
384                 return -ENODEV;
385         }
386         regs = ioremap(res.start, resource_size(&res));
387         if (!regs) {
388                 dev_err(&op->dev, "Could not map registers\n");
389                 return -ENODEV;
390         }
391 
392         /* Allocate and initialize the driver private data */
393         psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
394         if (!psc_dma) {
395                 ret = -ENOMEM;
396                 goto out_unmap;
397         }
398 
399         /* Get the PSC ID */
400         prop = of_get_property(op->dev.of_node, "cell-index", &size);
401         if (!prop || size < sizeof *prop) {
402                 ret = -ENODEV;
403                 goto out_free;
404         }
405 
406         spin_lock_init(&psc_dma->lock);
407         mutex_init(&psc_dma->mutex);
408         psc_dma->id = be32_to_cpu(*prop);
409         psc_dma->irq = irq;
410         psc_dma->psc_regs = regs;
411         psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
412         psc_dma->dev = &op->dev;
413         psc_dma->playback.psc_dma = psc_dma;
414         psc_dma->capture.psc_dma = psc_dma;
415         snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id);
416 
417         /* Find the address of the fifo data registers and setup the
418          * DMA tasks */
419         fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
420         psc_dma->capture.bcom_task =
421                 bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
422         psc_dma->playback.bcom_task =
423                 bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
424         if (!psc_dma->capture.bcom_task ||
425             !psc_dma->playback.bcom_task) {
426                 dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
427                 ret = -ENODEV;
428                 goto out_free;
429         }
430 
431         /* Disable all interrupts and reset the PSC */
432         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
433          /* reset receiver */
434         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
435          /* reset transmitter */
436         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
437          /* reset error */
438         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
439          /* reset mode */
440         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);
441 
442         /* Set up mode register;
443          * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
444          * Second write: register Normal mode for non loopback
445          */
446         out_8(&psc_dma->psc_regs->mode, 0);
447         out_8(&psc_dma->psc_regs->mode, 0);
448 
449         /* Set the TX and RX fifo alarm thresholds */
450         out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
451         out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
452         out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
453         out_8(&psc_dma->fifo_regs->tfcntl, 0x7);
454 
455         /* Lookup the IRQ numbers */
456         psc_dma->playback.irq =
457                 bcom_get_task_irq(psc_dma->playback.bcom_task);
458         psc_dma->capture.irq =
459                 bcom_get_task_irq(psc_dma->capture.bcom_task);
460 
461         rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
462                          "psc-dma-status", psc_dma);
463         rc |= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED,
464                           "psc-dma-capture", &psc_dma->capture);
465         rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED,
466                           "psc-dma-playback", &psc_dma->playback);
467         if (rc) {
468                 ret = -ENODEV;
469                 goto out_irq;
470         }
471 
472         /* Save what we've done so it can be found again later */
473         dev_set_drvdata(&op->dev, psc_dma);
474 
475         /* Tell the ASoC OF helpers about it */
476         return devm_snd_soc_register_component(&op->dev,
477                                         &mpc5200_audio_dma_component, NULL, 0);
478 out_irq:
479         free_irq(psc_dma->irq, psc_dma);
480         free_irq(psc_dma->capture.irq, &psc_dma->capture);
481         free_irq(psc_dma->playback.irq, &psc_dma->playback);
482 out_free:
483         kfree(psc_dma);
484 out_unmap:
485         iounmap(regs);
486         return ret;
487 }
488 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);
489 
490 int mpc5200_audio_dma_destroy(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         bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
497         bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);
498 
499         /* Release irqs */
500         free_irq(psc_dma->irq, psc_dma);
501         free_irq(psc_dma->capture.irq, &psc_dma->capture);
502         free_irq(psc_dma->playback.irq, &psc_dma->playback);
503 
504         iounmap(psc_dma->psc_regs);
505         kfree(psc_dma);
506         dev_set_drvdata(&op->dev, NULL);
507 
508         return 0;
509 }
510 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);
511 
512 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
513 MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
514 MODULE_LICENSE("GPL");
515 

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