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Linux/sound/soc/fsl/mpc5200_dma.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 //
  3 // Freescale MPC5200 PSC DMA
  4 // ALSA SoC Platform driver
  5 //
  6 // Copyright (C) 2008 Secret Lab Technologies Ltd.
  7 // Copyright (C) 2009 Jon Smirl, Digispeaker
  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_soc_component *component,
102                            struct snd_pcm_substream *substream)
103 {
104         snd_pcm_set_runtime_buffer(substream, NULL);
105         return 0;
106 }
107 
108 /**
109  * psc_dma_trigger: start and stop the DMA transfer.
110  *
111  * This function is called by ALSA to start, stop, pause, and resume the DMA
112  * transfer of data.
113  */
114 static int psc_dma_trigger(struct snd_soc_component *component,
115                            struct snd_pcm_substream *substream, int cmd)
116 {
117         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
118         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
119         struct snd_pcm_runtime *runtime = substream->runtime;
120         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
121         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
122         u16 imr;
123         unsigned long flags;
124         int i;
125 
126         switch (cmd) {
127         case SNDRV_PCM_TRIGGER_START:
128                 dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n",
129                         substream->pstr->stream, runtime->frame_bits,
130                         (int)runtime->period_size, runtime->periods);
131                 s->period_bytes = frames_to_bytes(runtime,
132                                                   runtime->period_size);
133                 s->period_next = 0;
134                 s->period_current = 0;
135                 s->active = 1;
136                 s->period_count = 0;
137                 s->runtime = runtime;
138 
139                 /* Fill up the bestcomm bd queue and enable DMA.
140                  * This will begin filling the PSC's fifo.
141                  */
142                 spin_lock_irqsave(&psc_dma->lock, flags);
143 
144                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
145                         bcom_gen_bd_rx_reset(s->bcom_task);
146                 else
147                         bcom_gen_bd_tx_reset(s->bcom_task);
148 
149                 for (i = 0; i < runtime->periods; i++)
150                         if (!bcom_queue_full(s->bcom_task))
151                                 psc_dma_bcom_enqueue_next_buffer(s);
152 
153                 bcom_enable(s->bcom_task);
154                 spin_unlock_irqrestore(&psc_dma->lock, flags);
155 
156                 out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
157 
158                 break;
159 
160         case SNDRV_PCM_TRIGGER_STOP:
161                 dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n",
162                         substream->pstr->stream, s->period_count);
163                 s->active = 0;
164 
165                 spin_lock_irqsave(&psc_dma->lock, flags);
166                 bcom_disable(s->bcom_task);
167                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
168                         bcom_gen_bd_rx_reset(s->bcom_task);
169                 else
170                         bcom_gen_bd_tx_reset(s->bcom_task);
171                 spin_unlock_irqrestore(&psc_dma->lock, flags);
172 
173                 break;
174 
175         default:
176                 dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n",
177                         substream->pstr->stream, cmd);
178                 return -EINVAL;
179         }
180 
181         /* Update interrupt enable settings */
182         imr = 0;
183         if (psc_dma->playback.active)
184                 imr |= MPC52xx_PSC_IMR_TXEMP;
185         if (psc_dma->capture.active)
186                 imr |= MPC52xx_PSC_IMR_ORERR;
187         out_be16(&regs->isr_imr.imr, psc_dma->imr | imr);
188 
189         return 0;
190 }
191 
192 
193 /* ---------------------------------------------------------------------
194  * The PSC DMA 'ASoC platform' driver
195  *
196  * Can be referenced by an 'ASoC machine' driver
197  * This driver only deals with the audio bus; it doesn't have any
198  * interaction with the attached codec
199  */
200 
201 static const struct snd_pcm_hardware psc_dma_hardware = {
202         .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
203                 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
204                 SNDRV_PCM_INFO_BATCH,
205         .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
206                 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
207         .period_bytes_max       = 1024 * 1024,
208         .period_bytes_min       = 32,
209         .periods_min            = 2,
210         .periods_max            = 256,
211         .buffer_bytes_max       = 2 * 1024 * 1024,
212         .fifo_size              = 512,
213 };
214 
215 static int psc_dma_open(struct snd_soc_component *component,
216                         struct snd_pcm_substream *substream)
217 {
218         struct snd_pcm_runtime *runtime = substream->runtime;
219         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
220         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
221         struct psc_dma_stream *s;
222         int rc;
223 
224         dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream);
225 
226         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
227                 s = &psc_dma->capture;
228         else
229                 s = &psc_dma->playback;
230 
231         snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware);
232 
233         rc = snd_pcm_hw_constraint_integer(runtime,
234                 SNDRV_PCM_HW_PARAM_PERIODS);
235         if (rc < 0) {
236                 dev_err(substream->pcm->card->dev, "invalid buffer size\n");
237                 return rc;
238         }
239 
240         s->stream = substream;
241         return 0;
242 }
243 
244 static int psc_dma_close(struct snd_soc_component *component,
245                          struct snd_pcm_substream *substream)
246 {
247         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
248         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
249         struct psc_dma_stream *s;
250 
251         dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream);
252 
253         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
254                 s = &psc_dma->capture;
255         else
256                 s = &psc_dma->playback;
257 
258         if (!psc_dma->playback.active &&
259             !psc_dma->capture.active) {
260 
261                 /* Disable all interrupts and reset the PSC */
262                 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
263                 out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
264         }
265         s->stream = NULL;
266         return 0;
267 }
268 
269 static snd_pcm_uframes_t
270 psc_dma_pointer(struct snd_soc_component *component,
271                 struct snd_pcm_substream *substream)
272 {
273         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
274         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
275         struct psc_dma_stream *s;
276         dma_addr_t count;
277 
278         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
279                 s = &psc_dma->capture;
280         else
281                 s = &psc_dma->playback;
282 
283         count = s->period_current * s->period_bytes;
284 
285         return bytes_to_frames(substream->runtime, count);
286 }
287 
288 static int psc_dma_hw_params(struct snd_soc_component *component,
289                              struct snd_pcm_substream *substream,
290                              struct snd_pcm_hw_params *params)
291 {
292         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
293 
294         return 0;
295 }
296 
297 static int psc_dma_new(struct snd_soc_component *component,
298                        struct snd_soc_pcm_runtime *rtd)
299 {
300         struct snd_card *card = rtd->card->snd_card;
301         struct snd_soc_dai *dai = asoc_rtd_to_cpu(rtd, 0);
302         struct snd_pcm *pcm = rtd->pcm;
303         size_t size = psc_dma_hardware.buffer_bytes_max;
304         int rc;
305 
306         dev_dbg(component->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
307                 card, dai, pcm);
308 
309         rc = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
310         if (rc)
311                 return rc;
312 
313         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
314                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
315                                 size, &pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
316                 if (rc)
317                         goto playback_alloc_err;
318         }
319 
320         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
321                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
322                                 size, &pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->dma_buffer);
323                 if (rc)
324                         goto capture_alloc_err;
325         }
326 
327         return 0;
328 
329  capture_alloc_err:
330         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
331                 snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
332 
333  playback_alloc_err:
334         dev_err(card->dev, "Cannot allocate buffer(s)\n");
335 
336         return -ENOMEM;
337 }
338 
339 static void psc_dma_free(struct snd_soc_component *component,
340                          struct snd_pcm *pcm)
341 {
342         struct snd_pcm_substream *substream;
343         int stream;
344 
345         dev_dbg(component->dev, "psc_dma_free(pcm=%p)\n", pcm);
346 
347         for (stream = 0; stream < 2; stream++) {
348                 substream = pcm->streams[stream].substream;
349                 if (substream) {
350                         snd_dma_free_pages(&substream->dma_buffer);
351                         substream->dma_buffer.area = NULL;
352                         substream->dma_buffer.addr = 0;
353                 }
354         }
355 }
356 
357 static const struct snd_soc_component_driver mpc5200_audio_dma_component = {
358         .name           = DRV_NAME,
359         .open           = psc_dma_open,
360         .close          = psc_dma_close,
361         .hw_free        = psc_dma_hw_free,
362         .pointer        = psc_dma_pointer,
363         .trigger        = psc_dma_trigger,
364         .hw_params      = psc_dma_hw_params,
365         .pcm_construct  = psc_dma_new,
366         .pcm_destruct   = psc_dma_free,
367 };
368 
369 int mpc5200_audio_dma_create(struct platform_device *op)
370 {
371         phys_addr_t fifo;
372         struct psc_dma *psc_dma;
373         struct resource res;
374         int size, irq, rc;
375         const __be32 *prop;
376         void __iomem *regs;
377         int ret;
378 
379         /* Fetch the registers and IRQ of the PSC */
380         irq = irq_of_parse_and_map(op->dev.of_node, 0);
381         if (of_address_to_resource(op->dev.of_node, 0, &res)) {
382                 dev_err(&op->dev, "Missing reg property\n");
383                 return -ENODEV;
384         }
385         regs = ioremap(res.start, resource_size(&res));
386         if (!regs) {
387                 dev_err(&op->dev, "Could not map registers\n");
388                 return -ENODEV;
389         }
390 
391         /* Allocate and initialize the driver private data */
392         psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
393         if (!psc_dma) {
394                 ret = -ENOMEM;
395                 goto out_unmap;
396         }
397 
398         /* Get the PSC ID */
399         prop = of_get_property(op->dev.of_node, "cell-index", &size);
400         if (!prop || size < sizeof *prop) {
401                 ret = -ENODEV;
402                 goto out_free;
403         }
404 
405         spin_lock_init(&psc_dma->lock);
406         mutex_init(&psc_dma->mutex);
407         psc_dma->id = be32_to_cpu(*prop);
408         psc_dma->irq = irq;
409         psc_dma->psc_regs = regs;
410         psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
411         psc_dma->dev = &op->dev;
412         psc_dma->playback.psc_dma = psc_dma;
413         psc_dma->capture.psc_dma = psc_dma;
414         snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id);
415 
416         /* Find the address of the fifo data registers and setup the
417          * DMA tasks */
418         fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
419         psc_dma->capture.bcom_task =
420                 bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
421         psc_dma->playback.bcom_task =
422                 bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
423         if (!psc_dma->capture.bcom_task ||
424             !psc_dma->playback.bcom_task) {
425                 dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
426                 ret = -ENODEV;
427                 goto out_free;
428         }
429 
430         /* Disable all interrupts and reset the PSC */
431         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
432          /* reset receiver */
433         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
434          /* reset transmitter */
435         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
436          /* reset error */
437         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
438          /* reset mode */
439         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);
440 
441         /* Set up mode register;
442          * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
443          * Second write: register Normal mode for non loopback
444          */
445         out_8(&psc_dma->psc_regs->mode, 0);
446         out_8(&psc_dma->psc_regs->mode, 0);
447 
448         /* Set the TX and RX fifo alarm thresholds */
449         out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
450         out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
451         out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
452         out_8(&psc_dma->fifo_regs->tfcntl, 0x7);
453 
454         /* Lookup the IRQ numbers */
455         psc_dma->playback.irq =
456                 bcom_get_task_irq(psc_dma->playback.bcom_task);
457         psc_dma->capture.irq =
458                 bcom_get_task_irq(psc_dma->capture.bcom_task);
459 
460         rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
461                          "psc-dma-status", psc_dma);
462         rc |= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED,
463                           "psc-dma-capture", &psc_dma->capture);
464         rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED,
465                           "psc-dma-playback", &psc_dma->playback);
466         if (rc) {
467                 ret = -ENODEV;
468                 goto out_irq;
469         }
470 
471         /* Save what we've done so it can be found again later */
472         dev_set_drvdata(&op->dev, psc_dma);
473 
474         /* Tell the ASoC OF helpers about it */
475         return devm_snd_soc_register_component(&op->dev,
476                                         &mpc5200_audio_dma_component, NULL, 0);
477 out_irq:
478         free_irq(psc_dma->irq, psc_dma);
479         free_irq(psc_dma->capture.irq, &psc_dma->capture);
480         free_irq(psc_dma->playback.irq, &psc_dma->playback);
481 out_free:
482         kfree(psc_dma);
483 out_unmap:
484         iounmap(regs);
485         return ret;
486 }
487 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);
488 
489 int mpc5200_audio_dma_destroy(struct platform_device *op)
490 {
491         struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);
492 
493         dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");
494 
495         bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
496         bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);
497 
498         /* Release irqs */
499         free_irq(psc_dma->irq, psc_dma);
500         free_irq(psc_dma->capture.irq, &psc_dma->capture);
501         free_irq(psc_dma->playback.irq, &psc_dma->playback);
502 
503         iounmap(psc_dma->psc_regs);
504         kfree(psc_dma);
505         dev_set_drvdata(&op->dev, NULL);
506 
507         return 0;
508 }
509 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);
510 
511 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
512 MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
513 MODULE_LICENSE("GPL");
514 

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