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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/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(&regs->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(&regs->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(&regs->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(&regs->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 static int __init mpc5200_hpcd_init(void)
530 {
531         return platform_driver_register(&mpc5200_hpcd_of_driver);
532 }
533 module_init(mpc5200_hpcd_init);
534 
535 static void __exit mpc5200_hpcd_exit(void)
536 {
537         platform_driver_unregister(&mpc5200_hpcd_of_driver);
538 }
539 module_exit(mpc5200_hpcd_exit);
540 
541 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
542 MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
543 MODULE_LICENSE("GPL");
544 

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