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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 /*
 26  * Interrupt handlers
 27  */
 28 static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
 29 {
 30         struct psc_dma *psc_dma = _psc_dma;
 31         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 32         u16 isr;
 33 
 34         isr = in_be16(&regs->mpc52xx_psc_isr);
 35 
 36         /* Playback underrun error */
 37         if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
 38                 psc_dma->stats.underrun_count++;
 39 
 40         /* Capture overrun error */
 41         if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
 42                 psc_dma->stats.overrun_count++;
 43 
 44         out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
 45 
 46         return IRQ_HANDLED;
 47 }
 48 
 49 /**
 50  * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
 51  * @s: pointer to stream private data structure
 52  *
 53  * Enqueues another audio period buffer into the bestcomm queue.
 54  *
 55  * Note: The routine must only be called when there is space available in
 56  * the queue.  Otherwise the enqueue will fail and the audio ring buffer
 57  * will get out of sync
 58  */
 59 static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
 60 {
 61         struct bcom_bd *bd;
 62 
 63         /* Prepare and enqueue the next buffer descriptor */
 64         bd = bcom_prepare_next_buffer(s->bcom_task);
 65         bd->status = s->period_bytes;
 66         bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes);
 67         bcom_submit_next_buffer(s->bcom_task, NULL);
 68 
 69         /* Update for next period */
 70         s->period_next = (s->period_next + 1) % s->runtime->periods;
 71 }
 72 
 73 /* Bestcomm DMA irq handler */
 74 static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream)
 75 {
 76         struct psc_dma_stream *s = _psc_dma_stream;
 77 
 78         spin_lock(&s->psc_dma->lock);
 79         /* For each finished period, dequeue the completed period buffer
 80          * and enqueue a new one in it's place. */
 81         while (bcom_buffer_done(s->bcom_task)) {
 82                 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
 83 
 84                 s->period_current = (s->period_current+1) % s->runtime->periods;
 85                 s->period_count++;
 86 
 87                 psc_dma_bcom_enqueue_next_buffer(s);
 88         }
 89         spin_unlock(&s->psc_dma->lock);
 90 
 91         /* If the stream is active, then also inform the PCM middle layer
 92          * of the period finished event. */
 93         if (s->active)
 94                 snd_pcm_period_elapsed(s->stream);
 95 
 96         return IRQ_HANDLED;
 97 }
 98 
 99 static int psc_dma_hw_free(struct snd_pcm_substream *substream)
100 {
101         snd_pcm_set_runtime_buffer(substream, NULL);
102         return 0;
103 }
104 
105 /**
106  * psc_dma_trigger: start and stop the DMA transfer.
107  *
108  * This function is called by ALSA to start, stop, pause, and resume the DMA
109  * transfer of data.
110  */
111 static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
112 {
113         struct snd_soc_pcm_runtime *rtd = substream->private_data;
114         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
115         struct snd_pcm_runtime *runtime = substream->runtime;
116         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
117         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
118         u16 imr;
119         unsigned long flags;
120         int i;
121 
122         switch (cmd) {
123         case SNDRV_PCM_TRIGGER_START:
124                 dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n",
125                         substream->pstr->stream, runtime->frame_bits,
126                         (int)runtime->period_size, runtime->periods);
127                 s->period_bytes = frames_to_bytes(runtime,
128                                                   runtime->period_size);
129                 s->period_next = 0;
130                 s->period_current = 0;
131                 s->active = 1;
132                 s->period_count = 0;
133                 s->runtime = runtime;
134 
135                 /* Fill up the bestcomm bd queue and enable DMA.
136                  * This will begin filling the PSC's fifo.
137                  */
138                 spin_lock_irqsave(&psc_dma->lock, flags);
139 
140                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
141                         bcom_gen_bd_rx_reset(s->bcom_task);
142                 else
143                         bcom_gen_bd_tx_reset(s->bcom_task);
144 
145                 for (i = 0; i < runtime->periods; i++)
146                         if (!bcom_queue_full(s->bcom_task))
147                                 psc_dma_bcom_enqueue_next_buffer(s);
148 
149                 bcom_enable(s->bcom_task);
150                 spin_unlock_irqrestore(&psc_dma->lock, flags);
151 
152                 out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
153 
154                 break;
155 
156         case SNDRV_PCM_TRIGGER_STOP:
157                 dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n",
158                         substream->pstr->stream, s->period_count);
159                 s->active = 0;
160 
161                 spin_lock_irqsave(&psc_dma->lock, flags);
162                 bcom_disable(s->bcom_task);
163                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
164                         bcom_gen_bd_rx_reset(s->bcom_task);
165                 else
166                         bcom_gen_bd_tx_reset(s->bcom_task);
167                 spin_unlock_irqrestore(&psc_dma->lock, flags);
168 
169                 break;
170 
171         default:
172                 dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n",
173                         substream->pstr->stream, cmd);
174                 return -EINVAL;
175         }
176 
177         /* Update interrupt enable settings */
178         imr = 0;
179         if (psc_dma->playback.active)
180                 imr |= MPC52xx_PSC_IMR_TXEMP;
181         if (psc_dma->capture.active)
182                 imr |= MPC52xx_PSC_IMR_ORERR;
183         out_be16(&regs->isr_imr.imr, psc_dma->imr | imr);
184 
185         return 0;
186 }
187 
188 
189 /* ---------------------------------------------------------------------
190  * The PSC DMA 'ASoC platform' driver
191  *
192  * Can be referenced by an 'ASoC machine' driver
193  * This driver only deals with the audio bus; it doesn't have any
194  * interaction with the attached codec
195  */
196 
197 static const struct snd_pcm_hardware psc_dma_hardware = {
198         .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
199                 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
200                 SNDRV_PCM_INFO_BATCH,
201         .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
202                 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
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 = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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 = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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 = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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 const 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 int psc_dma_new(struct snd_soc_pcm_runtime *rtd)
301 {
302         struct snd_card *card = rtd->card->snd_card;
303         struct snd_soc_dai *dai = rtd->cpu_dai;
304         struct snd_pcm *pcm = rtd->pcm;
305         size_t size = psc_dma_hardware.buffer_bytes_max;
306         int rc;
307 
308         dev_dbg(rtd->platform->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
309                 card, dai, pcm);
310 
311         rc = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
312         if (rc)
313                 return rc;
314 
315         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
316                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
317                                 size, &pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
318                 if (rc)
319                         goto playback_alloc_err;
320         }
321 
322         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
323                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
324                                 size, &pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->dma_buffer);
325                 if (rc)
326                         goto capture_alloc_err;
327         }
328 
329         return 0;
330 
331  capture_alloc_err:
332         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
333                 snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
334 
335  playback_alloc_err:
336         dev_err(card->dev, "Cannot allocate buffer(s)\n");
337 
338         return -ENOMEM;
339 }
340 
341 static void psc_dma_free(struct snd_pcm *pcm)
342 {
343         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
344         struct snd_pcm_substream *substream;
345         int stream;
346 
347         dev_dbg(rtd->platform->dev, "psc_dma_free(pcm=%p)\n", pcm);
348 
349         for (stream = 0; stream < 2; stream++) {
350                 substream = pcm->streams[stream].substream;
351                 if (substream) {
352                         snd_dma_free_pages(&substream->dma_buffer);
353                         substream->dma_buffer.area = NULL;
354                         substream->dma_buffer.addr = 0;
355                 }
356         }
357 }
358 
359 static const struct snd_soc_platform_driver mpc5200_audio_dma_platform = {
360         .ops            = &psc_dma_ops,
361         .pcm_new        = &psc_dma_new,
362         .pcm_free       = &psc_dma_free,
363 };
364 
365 int mpc5200_audio_dma_create(struct platform_device *op)
366 {
367         phys_addr_t fifo;
368         struct psc_dma *psc_dma;
369         struct resource res;
370         int size, irq, rc;
371         const __be32 *prop;
372         void __iomem *regs;
373         int ret;
374 
375         /* Fetch the registers and IRQ of the PSC */
376         irq = irq_of_parse_and_map(op->dev.of_node, 0);
377         if (of_address_to_resource(op->dev.of_node, 0, &res)) {
378                 dev_err(&op->dev, "Missing reg property\n");
379                 return -ENODEV;
380         }
381         regs = ioremap(res.start, resource_size(&res));
382         if (!regs) {
383                 dev_err(&op->dev, "Could not map registers\n");
384                 return -ENODEV;
385         }
386 
387         /* Allocate and initialize the driver private data */
388         psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
389         if (!psc_dma) {
390                 ret = -ENOMEM;
391                 goto out_unmap;
392         }
393 
394         /* Get the PSC ID */
395         prop = of_get_property(op->dev.of_node, "cell-index", &size);
396         if (!prop || size < sizeof *prop) {
397                 ret = -ENODEV;
398                 goto out_free;
399         }
400 
401         spin_lock_init(&psc_dma->lock);
402         mutex_init(&psc_dma->mutex);
403         psc_dma->id = be32_to_cpu(*prop);
404         psc_dma->irq = irq;
405         psc_dma->psc_regs = regs;
406         psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
407         psc_dma->dev = &op->dev;
408         psc_dma->playback.psc_dma = psc_dma;
409         psc_dma->capture.psc_dma = psc_dma;
410         snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id);
411 
412         /* Find the address of the fifo data registers and setup the
413          * DMA tasks */
414         fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
415         psc_dma->capture.bcom_task =
416                 bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
417         psc_dma->playback.bcom_task =
418                 bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
419         if (!psc_dma->capture.bcom_task ||
420             !psc_dma->playback.bcom_task) {
421                 dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
422                 ret = -ENODEV;
423                 goto out_free;
424         }
425 
426         /* Disable all interrupts and reset the PSC */
427         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
428          /* reset receiver */
429         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
430          /* reset transmitter */
431         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
432          /* reset error */
433         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
434          /* reset mode */
435         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);
436 
437         /* Set up mode register;
438          * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
439          * Second write: register Normal mode for non loopback
440          */
441         out_8(&psc_dma->psc_regs->mode, 0);
442         out_8(&psc_dma->psc_regs->mode, 0);
443 
444         /* Set the TX and RX fifo alarm thresholds */
445         out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
446         out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
447         out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
448         out_8(&psc_dma->fifo_regs->tfcntl, 0x7);
449 
450         /* Lookup the IRQ numbers */
451         psc_dma->playback.irq =
452                 bcom_get_task_irq(psc_dma->playback.bcom_task);
453         psc_dma->capture.irq =
454                 bcom_get_task_irq(psc_dma->capture.bcom_task);
455 
456         rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
457                          "psc-dma-status", psc_dma);
458         rc |= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED,
459                           "psc-dma-capture", &psc_dma->capture);
460         rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED,
461                           "psc-dma-playback", &psc_dma->playback);
462         if (rc) {
463                 ret = -ENODEV;
464                 goto out_irq;
465         }
466 
467         /* Save what we've done so it can be found again later */
468         dev_set_drvdata(&op->dev, psc_dma);
469 
470         /* Tell the ASoC OF helpers about it */
471         return snd_soc_register_platform(&op->dev, &mpc5200_audio_dma_platform);
472 out_irq:
473         free_irq(psc_dma->irq, psc_dma);
474         free_irq(psc_dma->capture.irq, &psc_dma->capture);
475         free_irq(psc_dma->playback.irq, &psc_dma->playback);
476 out_free:
477         kfree(psc_dma);
478 out_unmap:
479         iounmap(regs);
480         return ret;
481 }
482 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);
483 
484 int mpc5200_audio_dma_destroy(struct platform_device *op)
485 {
486         struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);
487 
488         dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");
489 
490         snd_soc_unregister_platform(&op->dev);
491 
492         bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
493         bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);
494 
495         /* Release irqs */
496         free_irq(psc_dma->irq, psc_dma);
497         free_irq(psc_dma->capture.irq, &psc_dma->capture);
498         free_irq(psc_dma->playback.irq, &psc_dma->playback);
499 
500         iounmap(psc_dma->psc_regs);
501         kfree(psc_dma);
502         dev_set_drvdata(&op->dev, NULL);
503 
504         return 0;
505 }
506 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);
507 
508 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
509 MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
510 MODULE_LICENSE("GPL");
511 

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