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MINI2440: Add touchscreen support
[linux-2.6/mini2440.git] / sound / soc / fsl / mpc5200_dma.c
blob6096d22283e6e5043386724cf11caf54b597f536
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
12 #include <sound/soc.h>
13
14 #include <sysdev/bestcomm/bestcomm.h>
15 #include <sysdev/bestcomm/gen_bd.h>
16 #include <asm/mpc52xx_psc.h>
17
18 #include "mpc5200_dma.h"
19
20 /*
21 * Interrupt handlers
22 */
23 static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
24 {
25 struct psc_dma *psc_dma = _psc_dma;
26 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
27 u16 isr;
28
29 isr = in_be16(&regs->mpc52xx_psc_isr);
30
31 /* Playback underrun error */
32 if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
33 psc_dma->stats.underrun_count++;
34
35 /* Capture overrun error */
36 if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
37 psc_dma->stats.overrun_count++;
38
39 out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
40
41 return IRQ_HANDLED;
42 }
43
44 /**
45 * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
46 * @s: pointer to stream private data structure
47 *
48 * Enqueues another audio period buffer into the bestcomm queue.
49 *
50 * Note: The routine must only be called when there is space available in
51 * the queue. Otherwise the enqueue will fail and the audio ring buffer
52 * will get out of sync
53 */
54 static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
55 {
56 struct bcom_bd *bd;
57
58 /* Prepare and enqueue the next buffer descriptor */
59 bd = bcom_prepare_next_buffer(s->bcom_task);
60 bd->status = s->period_bytes;
61 bd->data[0] = s->period_next_pt;
62 bcom_submit_next_buffer(s->bcom_task, NULL);
63
64 /* Update for next period */
65 s->period_next_pt += s->period_bytes;
66 if (s->period_next_pt >= s->period_end)
67 s->period_next_pt = s->period_start;
68 }
69
70 static void psc_dma_bcom_enqueue_tx(struct psc_dma_stream *s)
71 {
72 if (s->appl_ptr > s->runtime->control->appl_ptr) {
73 /*
74 * In this case s->runtime->control->appl_ptr has wrapped around.
75 * Play the data to the end of the boundary, then wrap our own
76 * appl_ptr back around.
77 */
78 while (s->appl_ptr < s->runtime->boundary) {
79 if (bcom_queue_full(s->bcom_task))
80 return;
81
82 s->appl_ptr += s->period_size;
83
84 psc_dma_bcom_enqueue_next_buffer(s);
85 }
86 s->appl_ptr -= s->runtime->boundary;
87 }
88
89 while (s->appl_ptr < s->runtime->control->appl_ptr) {
90
91 if (bcom_queue_full(s->bcom_task))
92 return;
93
94 s->appl_ptr += s->period_size;
95
96 psc_dma_bcom_enqueue_next_buffer(s);
97 }
98 }
99
100 /* Bestcomm DMA irq handler */
101 static irqreturn_t psc_dma_bcom_irq_tx(int irq, void *_psc_dma_stream)
102 {
103 struct psc_dma_stream *s = _psc_dma_stream;
104
105 spin_lock(&s->psc_dma->lock);
106 /* For each finished period, dequeue the completed period buffer
107 * and enqueue a new one in it's place. */
108 while (bcom_buffer_done(s->bcom_task)) {
109 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
110
111 s->period_current_pt += s->period_bytes;
112 if (s->period_current_pt >= s->period_end)
113 s->period_current_pt = s->period_start;
114 }
115 psc_dma_bcom_enqueue_tx(s);
116 spin_unlock(&s->psc_dma->lock);
117
118 /* If the stream is active, then also inform the PCM middle layer
119 * of the period finished event. */
120 if (s->active)
121 snd_pcm_period_elapsed(s->stream);
122
123 return IRQ_HANDLED;
124 }
125
126 static irqreturn_t psc_dma_bcom_irq_rx(int irq, void *_psc_dma_stream)
127 {
128 struct psc_dma_stream *s = _psc_dma_stream;
129
130 spin_lock(&s->psc_dma->lock);
131 /* For each finished period, dequeue the completed period buffer
132 * and enqueue a new one in it's place. */
133 while (bcom_buffer_done(s->bcom_task)) {
134 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
135
136 s->period_current_pt += s->period_bytes;
137 if (s->period_current_pt >= s->period_end)
138 s->period_current_pt = s->period_start;
139
140 psc_dma_bcom_enqueue_next_buffer(s);
141 }
142 spin_unlock(&s->psc_dma->lock);
143
144 /* If the stream is active, then also inform the PCM middle layer
145 * of the period finished event. */
146 if (s->active)
147 snd_pcm_period_elapsed(s->stream);
148
149 return IRQ_HANDLED;
150 }
151
152 static int psc_dma_hw_free(struct snd_pcm_substream *substream)
153 {
154 snd_pcm_set_runtime_buffer(substream, NULL);
155 return 0;
156 }
157
158 /**
159 * psc_dma_trigger: start and stop the DMA transfer.
160 *
161 * This function is called by ALSA to start, stop, pause, and resume the DMA
162 * transfer of data.
163 */
164 static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
165 {
166 struct snd_soc_pcm_runtime *rtd = substream->private_data;
167 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
168 struct snd_pcm_runtime *runtime = substream->runtime;
169 struct psc_dma_stream *s;
170 struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
171 u16 imr;
172 unsigned long flags;
173 int i;
174
175 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
176 s = &psc_dma->capture;
177 else
178 s = &psc_dma->playback;
179
180 dev_dbg(psc_dma->dev, "psc_dma_trigger(substream=%p, cmd=%i)"
181 " stream_id=%i\n",
182 substream, cmd, substream->pstr->stream);
183
184 switch (cmd) {
185 case SNDRV_PCM_TRIGGER_START:
186 s->period_bytes = frames_to_bytes(runtime,
187 runtime->period_size);
188 s->period_start = virt_to_phys(runtime->dma_area);
189 s->period_end = s->period_start +
190 (s->period_bytes * runtime->periods);
191 s->period_next_pt = s->period_start;
192 s->period_current_pt = s->period_start;
193 s->period_size = runtime->period_size;
194 s->active = 1;
195
196 /* track appl_ptr so that we have a better chance of detecting
197 * end of stream and not over running it.
198 */
199 s->runtime = runtime;
200 s->appl_ptr = s->runtime->control->appl_ptr -
201 (runtime->period_size * runtime->periods);
202
203 /* Fill up the bestcomm bd queue and enable DMA.
204 * This will begin filling the PSC's fifo.
205 */
206 spin_lock_irqsave(&psc_dma->lock, flags);
207
208 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
209 bcom_gen_bd_rx_reset(s->bcom_task);
210 for (i = 0; i < runtime->periods; i++)
211 if (!bcom_queue_full(s->bcom_task))
212 psc_dma_bcom_enqueue_next_buffer(s);
213 } else {
214 bcom_gen_bd_tx_reset(s->bcom_task);
215 psc_dma_bcom_enqueue_tx(s);
216 }
217
218 bcom_enable(s->bcom_task);
219 spin_unlock_irqrestore(&psc_dma->lock, flags);
220
221 out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
222
223 break;
224
225 case SNDRV_PCM_TRIGGER_STOP:
226 s->active = 0;
227
228 spin_lock_irqsave(&psc_dma->lock, flags);
229 bcom_disable(s->bcom_task);
230 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
231 bcom_gen_bd_rx_reset(s->bcom_task);
232 else
233 bcom_gen_bd_tx_reset(s->bcom_task);
234 spin_unlock_irqrestore(&psc_dma->lock, flags);
235
236 break;
237
238 default:
239 dev_dbg(psc_dma->dev, "invalid command\n");
240 return -EINVAL;
241 }
242
243 /* Update interrupt enable settings */
244 imr = 0;
245 if (psc_dma->playback.active)
246 imr |= MPC52xx_PSC_IMR_TXEMP;
247 if (psc_dma->capture.active)
248 imr |= MPC52xx_PSC_IMR_ORERR;
249 out_be16(&regs->isr_imr.imr, psc_dma->imr | imr);
250
251 return 0;
252 }
253
254
255 /* ---------------------------------------------------------------------
256 * The PSC DMA 'ASoC platform' driver
257 *
258 * Can be referenced by an 'ASoC machine' driver
259 * This driver only deals with the audio bus; it doesn't have any
260 * interaction with the attached codec
261 */
262
263 static const struct snd_pcm_hardware psc_dma_hardware = {
264 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
265 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
266 SNDRV_PCM_INFO_BATCH,
267 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
268 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
269 .rate_min = 8000,
270 .rate_max = 48000,
271 .channels_min = 1,
272 .channels_max = 2,
273 .period_bytes_max = 1024 * 1024,
274 .period_bytes_min = 32,
275 .periods_min = 2,
276 .periods_max = 256,
277 .buffer_bytes_max = 2 * 1024 * 1024,
278 .fifo_size = 512,
279 };
280
281 static int psc_dma_open(struct snd_pcm_substream *substream)
282 {
283 struct snd_pcm_runtime *runtime = substream->runtime;
284 struct snd_soc_pcm_runtime *rtd = substream->private_data;
285 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
286 struct psc_dma_stream *s;
287 int rc;
288
289 dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream);
290
291 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
292 s = &psc_dma->capture;
293 else
294 s = &psc_dma->playback;
295
296 snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware);
297
298 rc = snd_pcm_hw_constraint_integer(runtime,
299 SNDRV_PCM_HW_PARAM_PERIODS);
300 if (rc < 0) {
301 dev_err(substream->pcm->card->dev, "invalid buffer size\n");
302 return rc;
303 }
304
305 s->stream = substream;
306 return 0;
307 }
308
309 static int psc_dma_close(struct snd_pcm_substream *substream)
310 {
311 struct snd_soc_pcm_runtime *rtd = substream->private_data;
312 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
313 struct psc_dma_stream *s;
314
315 dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream);
316
317 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
318 s = &psc_dma->capture;
319 else
320 s = &psc_dma->playback;
321
322 if (!psc_dma->playback.active &&
323 !psc_dma->capture.active) {
324
325 /* Disable all interrupts and reset the PSC */
326 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
327 out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
328 }
329 s->stream = NULL;
330 return 0;
331 }
332
333 static snd_pcm_uframes_t
334 psc_dma_pointer(struct snd_pcm_substream *substream)
335 {
336 struct snd_soc_pcm_runtime *rtd = substream->private_data;
337 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
338 struct psc_dma_stream *s;
339 dma_addr_t count;
340
341 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
342 s = &psc_dma->capture;
343 else
344 s = &psc_dma->playback;
345
346 count = s->period_current_pt - s->period_start;
347
348 return bytes_to_frames(substream->runtime, count);
349 }
350
351 static int
352 psc_dma_hw_params(struct snd_pcm_substream *substream,
353 struct snd_pcm_hw_params *params)
354 {
355 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
356
357 return 0;
358 }
359
360 static struct snd_pcm_ops psc_dma_ops = {
361 .open = psc_dma_open,
362 .close = psc_dma_close,
363 .hw_free = psc_dma_hw_free,
364 .ioctl = snd_pcm_lib_ioctl,
365 .pointer = psc_dma_pointer,
366 .trigger = psc_dma_trigger,
367 .hw_params = psc_dma_hw_params,
368 };
369
370 static u64 psc_dma_dmamask = 0xffffffff;
371 static int psc_dma_new(struct snd_card *card, struct snd_soc_dai *dai,
372 struct snd_pcm *pcm)
373 {
374 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
375 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
376 size_t size = psc_dma_hardware.buffer_bytes_max;
377 int rc = 0;
378
379 dev_dbg(rtd->socdev->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
380 card, dai, pcm);
381
382 if (!card->dev->dma_mask)
383 card->dev->dma_mask = &psc_dma_dmamask;
384 if (!card->dev->coherent_dma_mask)
385 card->dev->coherent_dma_mask = 0xffffffff;
386
387 if (pcm->streams[0].substream) {
388 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
389 size, &pcm->streams[0].substream->dma_buffer);
390 if (rc)
391 goto playback_alloc_err;
392 }
393
394 if (pcm->streams[1].substream) {
395 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
396 size, &pcm->streams[1].substream->dma_buffer);
397 if (rc)
398 goto capture_alloc_err;
399 }
400
401 if (rtd->socdev->card->codec->ac97)
402 rtd->socdev->card->codec->ac97->private_data = psc_dma;
403
404 return 0;
405
406 capture_alloc_err:
407 if (pcm->streams[0].substream)
408 snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer);
409
410 playback_alloc_err:
411 dev_err(card->dev, "Cannot allocate buffer(s)\n");
412
413 return -ENOMEM;
414 }
415
416 static void psc_dma_free(struct snd_pcm *pcm)
417 {
418 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
419 struct snd_pcm_substream *substream;
420 int stream;
421
422 dev_dbg(rtd->socdev->dev, "psc_dma_free(pcm=%p)\n", pcm);
423
424 for (stream = 0; stream < 2; stream++) {
425 substream = pcm->streams[stream].substream;
426 if (substream) {
427 snd_dma_free_pages(&substream->dma_buffer);
428 substream->dma_buffer.area = NULL;
429 substream->dma_buffer.addr = 0;
430 }
431 }
432 }
433
434 struct snd_soc_platform mpc5200_audio_dma_platform = {
435 .name = "mpc5200-psc-audio",
436 .pcm_ops = &psc_dma_ops,
437 .pcm_new = &psc_dma_new,
438 .pcm_free = &psc_dma_free,
439 };
440 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_platform);
441
442 int mpc5200_audio_dma_create(struct of_device *op)
443 {
444 phys_addr_t fifo;
445 struct psc_dma *psc_dma;
446 struct resource res;
447 int size, irq, rc;
448 const __be32 *prop;
449 void __iomem *regs;
450 int ret;
451
452 /* Fetch the registers and IRQ of the PSC */
453 irq = irq_of_parse_and_map(op->node, 0);
454 if (of_address_to_resource(op->node, 0, &res)) {
455 dev_err(&op->dev, "Missing reg property\n");
456 return -ENODEV;
457 }
458 regs = ioremap(res.start, 1 + res.end - res.start);
459 if (!regs) {
460 dev_err(&op->dev, "Could not map registers\n");
461 return -ENODEV;
462 }
463
464 /* Allocate and initialize the driver private data */
465 psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
466 if (!psc_dma) {
467 ret = -ENOMEM;
468 goto out_unmap;
469 }
470
471 /* Get the PSC ID */
472 prop = of_get_property(op->node, "cell-index", &size);
473 if (!prop || size < sizeof *prop) {
474 ret = -ENODEV;
475 goto out_free;
476 }
477
478 spin_lock_init(&psc_dma->lock);
479 mutex_init(&psc_dma->mutex);
480 psc_dma->id = be32_to_cpu(*prop);
481 psc_dma->irq = irq;
482 psc_dma->psc_regs = regs;
483 psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
484 psc_dma->dev = &op->dev;
485 psc_dma->playback.psc_dma = psc_dma;
486 psc_dma->capture.psc_dma = psc_dma;
487 snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id);
488
489 /* Find the address of the fifo data registers and setup the
490 * DMA tasks */
491 fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
492 psc_dma->capture.bcom_task =
493 bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
494 psc_dma->playback.bcom_task =
495 bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
496 if (!psc_dma->capture.bcom_task ||
497 !psc_dma->playback.bcom_task) {
498 dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
499 ret = -ENODEV;
500 goto out_free;
501 }
502
503 /* Disable all interrupts and reset the PSC */
504 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
505 /* reset receiver */
506 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
507 /* reset transmitter */
508 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
509 /* reset error */
510 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
511 /* reset mode */
512 out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);
513
514 /* Set up mode register;
515 * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
516 * Second write: register Normal mode for non loopback
517 */
518 out_8(&psc_dma->psc_regs->mode, 0);
519 out_8(&psc_dma->psc_regs->mode, 0);
520
521 /* Set the TX and RX fifo alarm thresholds */
522 out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
523 out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
524 out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
525 out_8(&psc_dma->fifo_regs->tfcntl, 0x7);
526
527 /* Lookup the IRQ numbers */
528 psc_dma->playback.irq =
529 bcom_get_task_irq(psc_dma->playback.bcom_task);
530 psc_dma->capture.irq =
531 bcom_get_task_irq(psc_dma->capture.bcom_task);
532
533 rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
534 "psc-dma-status", psc_dma);
535 rc |= request_irq(psc_dma->capture.irq,
536 &psc_dma_bcom_irq_rx, IRQF_SHARED,
537 "psc-dma-capture", &psc_dma->capture);
538 rc |= request_irq(psc_dma->playback.irq,
539 &psc_dma_bcom_irq_tx, IRQF_SHARED,
540 "psc-dma-playback", &psc_dma->playback);
541 if (rc) {
542 ret = -ENODEV;
543 goto out_irq;
544 }
545
546 /* Save what we've done so it can be found again later */
547 dev_set_drvdata(&op->dev, psc_dma);
548
549 /* Tell the ASoC OF helpers about it */
550 return snd_soc_register_platform(&mpc5200_audio_dma_platform);
551 out_irq:
552 free_irq(psc_dma->irq, psc_dma);
553 free_irq(psc_dma->capture.irq, &psc_dma->capture);
554 free_irq(psc_dma->playback.irq, &psc_dma->playback);
555 out_free:
556 kfree(psc_dma);
557 out_unmap:
558 iounmap(regs);
559 return ret;
560 }
561 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);
562
563 int mpc5200_audio_dma_destroy(struct of_device *op)
564 {
565 struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);
566
567 dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");
568
569 snd_soc_unregister_platform(&mpc5200_audio_dma_platform);
570
571 bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
572 bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);
573
574 /* Release irqs */
575 free_irq(psc_dma->irq, psc_dma);
576 free_irq(psc_dma->capture.irq, &psc_dma->capture);
577 free_irq(psc_dma->playback.irq, &psc_dma->playback);
578
579 iounmap(psc_dma->psc_regs);
580 kfree(psc_dma);
581 dev_set_drvdata(&op->dev, NULL);
582
583 return 0;
584 }
585 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);
586
587 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
588 MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
589 MODULE_LICENSE("GPL");
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