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Linux/sound/soc/atmel/atmel-pcm.c

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  1 /*
  2  * atmel-pcm.c  --  ALSA PCM interface for the Atmel atmel SoC.
  3  *
  4  *  Copyright (C) 2005 SAN People
  5  *  Copyright (C) 2008 Atmel
  6  *
  7  * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
  8  *
  9  * Based on at91-pcm. by:
 10  * Frank Mandarino <fmandarino@endrelia.com>
 11  * Copyright 2006 Endrelia Technologies Inc.
 12  *
 13  * Based on pxa2xx-pcm.c by:
 14  *
 15  * Author:      Nicolas Pitre
 16  * Created:     Nov 30, 2004
 17  * Copyright:   (C) 2004 MontaVista Software, Inc.
 18  *
 19  * This program is free software; you can redistribute it and/or modify
 20  * it under the terms of the GNU General Public License as published by
 21  * the Free Software Foundation; either version 2 of the License, or
 22  * (at your option) any later version.
 23  *
 24  * This program is distributed in the hope that it will be useful,
 25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 27  * GNU General Public License for more details.
 28  *
 29  * You should have received a copy of the GNU General Public License
 30  * along with this program; if not, write to the Free Software
 31  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 32  */
 33 
 34 #include <linux/module.h>
 35 #include <linux/init.h>
 36 #include <linux/platform_device.h>
 37 #include <linux/slab.h>
 38 #include <linux/dma-mapping.h>
 39 #include <linux/atmel_pdc.h>
 40 #include <linux/atmel-ssc.h>
 41 
 42 #include <sound/core.h>
 43 #include <sound/pcm.h>
 44 #include <sound/pcm_params.h>
 45 #include <sound/soc.h>
 46 
 47 #include "atmel-pcm.h"
 48 
 49 
 50 /*--------------------------------------------------------------------------*\
 51  * Hardware definition
 52 \*--------------------------------------------------------------------------*/
 53 /* TODO: These values were taken from the AT91 platform driver, check
 54  *       them against real values for AT32
 55  */
 56 static const struct snd_pcm_hardware atmel_pcm_hardware = {
 57         .info                   = SNDRV_PCM_INFO_MMAP |
 58                                   SNDRV_PCM_INFO_MMAP_VALID |
 59                                   SNDRV_PCM_INFO_INTERLEAVED |
 60                                   SNDRV_PCM_INFO_PAUSE,
 61         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 62         .period_bytes_min       = 32,
 63         .period_bytes_max       = 8192,
 64         .periods_min            = 2,
 65         .periods_max            = 1024,
 66         .buffer_bytes_max       = 32 * 1024,
 67 };
 68 
 69 
 70 /*--------------------------------------------------------------------------*\
 71  * Data types
 72 \*--------------------------------------------------------------------------*/
 73 struct atmel_runtime_data {
 74         struct atmel_pcm_dma_params *params;
 75         dma_addr_t dma_buffer;          /* physical address of dma buffer */
 76         dma_addr_t dma_buffer_end;      /* first address beyond DMA buffer */
 77         size_t period_size;
 78 
 79         dma_addr_t period_ptr;          /* physical address of next period */
 80         int periods;                    /* period index of period_ptr */
 81 
 82         /* PDC register save */
 83         u32 pdc_xpr_save;
 84         u32 pdc_xcr_save;
 85         u32 pdc_xnpr_save;
 86         u32 pdc_xncr_save;
 87 };
 88 
 89 
 90 /*--------------------------------------------------------------------------*\
 91  * Helper functions
 92 \*--------------------------------------------------------------------------*/
 93 static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 94         int stream)
 95 {
 96         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 97         struct snd_dma_buffer *buf = &substream->dma_buffer;
 98         size_t size = atmel_pcm_hardware.buffer_bytes_max;
 99 
100         buf->dev.type = SNDRV_DMA_TYPE_DEV;
101         buf->dev.dev = pcm->card->dev;
102         buf->private_data = NULL;
103         buf->area = dma_alloc_coherent(pcm->card->dev, size,
104                                           &buf->addr, GFP_KERNEL);
105         pr_debug("atmel-pcm:"
106                 "preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
107                 (void *) buf->area,
108                 (void *) buf->addr,
109                 size);
110 
111         if (!buf->area)
112                 return -ENOMEM;
113 
114         buf->bytes = size;
115         return 0;
116 }
117 /*--------------------------------------------------------------------------*\
118  * ISR
119 \*--------------------------------------------------------------------------*/
120 static void atmel_pcm_dma_irq(u32 ssc_sr,
121         struct snd_pcm_substream *substream)
122 {
123         struct atmel_runtime_data *prtd = substream->runtime->private_data;
124         struct atmel_pcm_dma_params *params = prtd->params;
125         static int count;
126 
127         count++;
128 
129         if (ssc_sr & params->mask->ssc_endbuf) {
130                 pr_warning("atmel-pcm: buffer %s on %s"
131                                 " (SSC_SR=%#x, count=%d)\n",
132                                 substream->stream == SNDRV_PCM_STREAM_PLAYBACK
133                                 ? "underrun" : "overrun",
134                                 params->name, ssc_sr, count);
135 
136                 /* re-start the PDC */
137                 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
138                            params->mask->pdc_disable);
139                 prtd->period_ptr += prtd->period_size;
140                 if (prtd->period_ptr >= prtd->dma_buffer_end)
141                         prtd->period_ptr = prtd->dma_buffer;
142 
143                 ssc_writex(params->ssc->regs, params->pdc->xpr,
144                            prtd->period_ptr);
145                 ssc_writex(params->ssc->regs, params->pdc->xcr,
146                            prtd->period_size / params->pdc_xfer_size);
147                 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
148                            params->mask->pdc_enable);
149         }
150 
151         if (ssc_sr & params->mask->ssc_endx) {
152                 /* Load the PDC next pointer and counter registers */
153                 prtd->period_ptr += prtd->period_size;
154                 if (prtd->period_ptr >= prtd->dma_buffer_end)
155                         prtd->period_ptr = prtd->dma_buffer;
156 
157                 ssc_writex(params->ssc->regs, params->pdc->xnpr,
158                            prtd->period_ptr);
159                 ssc_writex(params->ssc->regs, params->pdc->xncr,
160                            prtd->period_size / params->pdc_xfer_size);
161         }
162 
163         snd_pcm_period_elapsed(substream);
164 }
165 
166 
167 /*--------------------------------------------------------------------------*\
168  * PCM operations
169 \*--------------------------------------------------------------------------*/
170 static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
171         struct snd_pcm_hw_params *params)
172 {
173         struct snd_pcm_runtime *runtime = substream->runtime;
174         struct atmel_runtime_data *prtd = runtime->private_data;
175         struct snd_soc_pcm_runtime *rtd = substream->private_data;
176 
177         /* this may get called several times by oss emulation
178          * with different params */
179 
180         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
181         runtime->dma_bytes = params_buffer_bytes(params);
182 
183         prtd->params = rtd->dai->cpu_dai->dma_data;
184         prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
185 
186         prtd->dma_buffer = runtime->dma_addr;
187         prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
188         prtd->period_size = params_period_bytes(params);
189 
190         pr_debug("atmel-pcm: "
191                 "hw_params: DMA for %s initialized "
192                 "(dma_bytes=%u, period_size=%u)\n",
193                 prtd->params->name,
194                 runtime->dma_bytes,
195                 prtd->period_size);
196         return 0;
197 }
198 
199 static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
200 {
201         struct atmel_runtime_data *prtd = substream->runtime->private_data;
202         struct atmel_pcm_dma_params *params = prtd->params;
203 
204         if (params != NULL) {
205                 ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
206                            params->mask->pdc_disable);
207                 prtd->params->dma_intr_handler = NULL;
208         }
209 
210         return 0;
211 }
212 
213 static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
214 {
215         struct atmel_runtime_data *prtd = substream->runtime->private_data;
216         struct atmel_pcm_dma_params *params = prtd->params;
217 
218         ssc_writex(params->ssc->regs, SSC_IDR,
219                    params->mask->ssc_endx | params->mask->ssc_endbuf);
220         ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
221                    params->mask->pdc_disable);
222         return 0;
223 }
224 
225 static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
226         int cmd)
227 {
228         struct snd_pcm_runtime *rtd = substream->runtime;
229         struct atmel_runtime_data *prtd = rtd->private_data;
230         struct atmel_pcm_dma_params *params = prtd->params;
231         int ret = 0;
232 
233         pr_debug("atmel-pcm:buffer_size = %ld,"
234                 "dma_area = %p, dma_bytes = %u\n",
235                 rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
236 
237         switch (cmd) {
238         case SNDRV_PCM_TRIGGER_START:
239                 prtd->period_ptr = prtd->dma_buffer;
240 
241                 ssc_writex(params->ssc->regs, params->pdc->xpr,
242                            prtd->period_ptr);
243                 ssc_writex(params->ssc->regs, params->pdc->xcr,
244                            prtd->period_size / params->pdc_xfer_size);
245 
246                 prtd->period_ptr += prtd->period_size;
247                 ssc_writex(params->ssc->regs, params->pdc->xnpr,
248                            prtd->period_ptr);
249                 ssc_writex(params->ssc->regs, params->pdc->xncr,
250                            prtd->period_size / params->pdc_xfer_size);
251 
252                 pr_debug("atmel-pcm: trigger: "
253                         "period_ptr=%lx, xpr=%u, "
254                         "xcr=%u, xnpr=%u, xncr=%u\n",
255                         (unsigned long)prtd->period_ptr,
256                         ssc_readx(params->ssc->regs, params->pdc->xpr),
257                         ssc_readx(params->ssc->regs, params->pdc->xcr),
258                         ssc_readx(params->ssc->regs, params->pdc->xnpr),
259                         ssc_readx(params->ssc->regs, params->pdc->xncr));
260 
261                 ssc_writex(params->ssc->regs, SSC_IER,
262                            params->mask->ssc_endx | params->mask->ssc_endbuf);
263                 ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
264                            params->mask->pdc_enable);
265 
266                 pr_debug("sr=%u imr=%u\n",
267                         ssc_readx(params->ssc->regs, SSC_SR),
268                         ssc_readx(params->ssc->regs, SSC_IER));
269                 break;          /* SNDRV_PCM_TRIGGER_START */
270 
271         case SNDRV_PCM_TRIGGER_STOP:
272         case SNDRV_PCM_TRIGGER_SUSPEND:
273         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
274                 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
275                            params->mask->pdc_disable);
276                 break;
277 
278         case SNDRV_PCM_TRIGGER_RESUME:
279         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
280                 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
281                            params->mask->pdc_enable);
282                 break;
283 
284         default:
285                 ret = -EINVAL;
286         }
287 
288         return ret;
289 }
290 
291 static snd_pcm_uframes_t atmel_pcm_pointer(
292         struct snd_pcm_substream *substream)
293 {
294         struct snd_pcm_runtime *runtime = substream->runtime;
295         struct atmel_runtime_data *prtd = runtime->private_data;
296         struct atmel_pcm_dma_params *params = prtd->params;
297         dma_addr_t ptr;
298         snd_pcm_uframes_t x;
299 
300         ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
301         x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
302 
303         if (x == runtime->buffer_size)
304                 x = 0;
305 
306         return x;
307 }
308 
309 static int atmel_pcm_open(struct snd_pcm_substream *substream)
310 {
311         struct snd_pcm_runtime *runtime = substream->runtime;
312         struct atmel_runtime_data *prtd;
313         int ret = 0;
314 
315         snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);
316 
317         /* ensure that buffer size is a multiple of period size */
318         ret = snd_pcm_hw_constraint_integer(runtime,
319                                                 SNDRV_PCM_HW_PARAM_PERIODS);
320         if (ret < 0)
321                 goto out;
322 
323         prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
324         if (prtd == NULL) {
325                 ret = -ENOMEM;
326                 goto out;
327         }
328         runtime->private_data = prtd;
329 
330  out:
331         return ret;
332 }
333 
334 static int atmel_pcm_close(struct snd_pcm_substream *substream)
335 {
336         struct atmel_runtime_data *prtd = substream->runtime->private_data;
337 
338         kfree(prtd);
339         return 0;
340 }
341 
342 static int atmel_pcm_mmap(struct snd_pcm_substream *substream,
343         struct vm_area_struct *vma)
344 {
345         return remap_pfn_range(vma, vma->vm_start,
346                        substream->dma_buffer.addr >> PAGE_SHIFT,
347                        vma->vm_end - vma->vm_start, vma->vm_page_prot);
348 }
349 
350 static struct snd_pcm_ops atmel_pcm_ops = {
351         .open           = atmel_pcm_open,
352         .close          = atmel_pcm_close,
353         .ioctl          = snd_pcm_lib_ioctl,
354         .hw_params      = atmel_pcm_hw_params,
355         .hw_free        = atmel_pcm_hw_free,
356         .prepare        = atmel_pcm_prepare,
357         .trigger        = atmel_pcm_trigger,
358         .pointer        = atmel_pcm_pointer,
359         .mmap           = atmel_pcm_mmap,
360 };
361 
362 
363 /*--------------------------------------------------------------------------*\
364  * ASoC platform driver
365 \*--------------------------------------------------------------------------*/
366 static u64 atmel_pcm_dmamask = 0xffffffff;
367 
368 static int atmel_pcm_new(struct snd_card *card,
369         struct snd_soc_dai *dai, struct snd_pcm *pcm)
370 {
371         int ret = 0;
372 
373         if (!card->dev->dma_mask)
374                 card->dev->dma_mask = &atmel_pcm_dmamask;
375         if (!card->dev->coherent_dma_mask)
376                 card->dev->coherent_dma_mask = 0xffffffff;
377 
378         if (dai->playback.channels_min) {
379                 ret = atmel_pcm_preallocate_dma_buffer(pcm,
380                         SNDRV_PCM_STREAM_PLAYBACK);
381                 if (ret)
382                         goto out;
383         }
384 
385         if (dai->capture.channels_min) {
386                 pr_debug("at32-pcm:"
387                                 "Allocating PCM capture DMA buffer\n");
388                 ret = atmel_pcm_preallocate_dma_buffer(pcm,
389                         SNDRV_PCM_STREAM_CAPTURE);
390                 if (ret)
391                         goto out;
392         }
393  out:
394         return ret;
395 }
396 
397 static void atmel_pcm_free_dma_buffers(struct snd_pcm *pcm)
398 {
399         struct snd_pcm_substream *substream;
400         struct snd_dma_buffer *buf;
401         int stream;
402 
403         for (stream = 0; stream < 2; stream++) {
404                 substream = pcm->streams[stream].substream;
405                 if (!substream)
406                         continue;
407 
408                 buf = &substream->dma_buffer;
409                 if (!buf->area)
410                         continue;
411                 dma_free_coherent(pcm->card->dev, buf->bytes,
412                                   buf->area, buf->addr);
413                 buf->area = NULL;
414         }
415 }
416 
417 #ifdef CONFIG_PM
418 static int atmel_pcm_suspend(struct snd_soc_dai *dai)
419 {
420         struct snd_pcm_runtime *runtime = dai->runtime;
421         struct atmel_runtime_data *prtd;
422         struct atmel_pcm_dma_params *params;
423 
424         if (!runtime)
425                 return 0;
426 
427         prtd = runtime->private_data;
428         params = prtd->params;
429 
430         /* disable the PDC and save the PDC registers */
431 
432         ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);
433 
434         prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
435         prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
436         prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
437         prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);
438 
439         return 0;
440 }
441 
442 static int atmel_pcm_resume(struct snd_soc_dai *dai)
443 {
444         struct snd_pcm_runtime *runtime = dai->runtime;
445         struct atmel_runtime_data *prtd;
446         struct atmel_pcm_dma_params *params;
447 
448         if (!runtime)
449                 return 0;
450 
451         prtd = runtime->private_data;
452         params = prtd->params;
453 
454         /* restore the PDC registers and enable the PDC */
455         ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
456         ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
457         ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
458         ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);
459 
460         ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
461         return 0;
462 }
463 #else
464 #define atmel_pcm_suspend       NULL
465 #define atmel_pcm_resume        NULL
466 #endif
467 
468 struct snd_soc_platform atmel_soc_platform = {
469         .name           = "atmel-audio",
470         .pcm_ops        = &atmel_pcm_ops,
471         .pcm_new        = atmel_pcm_new,
472         .pcm_free       = atmel_pcm_free_dma_buffers,
473         .suspend        = atmel_pcm_suspend,
474         .resume         = atmel_pcm_resume,
475 };
476 EXPORT_SYMBOL_GPL(atmel_soc_platform);
477 
478 static int __init atmel_pcm_modinit(void)
479 {
480         return snd_soc_register_platform(&atmel_soc_platform);
481 }
482 module_init(atmel_pcm_modinit);
483 
484 static void __exit atmel_pcm_modexit(void)
485 {
486         snd_soc_unregister_platform(&atmel_soc_platform);
487 }
488 module_exit(atmel_pcm_modexit);
489 
490 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
491 MODULE_DESCRIPTION("Atmel PCM module");
492 MODULE_LICENSE("GPL");
493 

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