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bf5xx-ac97-pcm.c
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1 /*
2  * File: sound/soc/blackfin/bf5xx-ac97-pcm.c
3  * Author: Cliff Cai <[email protected]>
4  *
5  * Created: Tue June 06 2008
6  * Description: DMA Driver for AC97 sound chip
7  *
8  * Modified:
9  * Copyright 2008 Analog Devices Inc.
10  *
11  * Bugs: Enter bugs at http://blackfin.uclinux.org/
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License as published by
15  * the Free Software Foundation; either version 2 of the License, or
16  * (at your option) any later version.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21  * GNU General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, see the file COPYING, or write
25  * to the Free Software Foundation, Inc.,
26  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
27  */
28 
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/platform_device.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/gfp.h>
34 
35 #include <sound/core.h>
36 #include <sound/pcm.h>
37 #include <sound/pcm_params.h>
38 #include <sound/soc.h>
39 
40 #include <asm/dma.h>
41 
42 #include "bf5xx-ac97-pcm.h"
43 #include "bf5xx-ac97.h"
44 #include "bf5xx-sport.h"
45 
46 static unsigned int ac97_chan_mask[] = {
47  SP_FL, /* Mono */
48  SP_STEREO, /* Stereo */
49  SP_2DOT1, /* 2.1*/
50  SP_QUAD,/*Quadraquic*/
51  SP_FL | SP_FR | SP_FC | SP_SL | SP_SR,/*5 channels */
52  SP_5DOT1, /* 5.1 */
53 };
54 
55 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
56 static void bf5xx_mmap_copy(struct snd_pcm_substream *substream,
57  snd_pcm_uframes_t count)
58 {
59  struct snd_pcm_runtime *runtime = substream->runtime;
60  struct sport_device *sport = runtime->private_data;
61  unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
62  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
63  bf5xx_pcm_to_ac97((struct ac97_frame *)sport->tx_dma_buf +
64  sport->tx_pos, (__u16 *)runtime->dma_area + sport->tx_pos *
65  runtime->channels, count, chan_mask);
66  sport->tx_pos += runtime->period_size;
67  if (sport->tx_pos >= runtime->buffer_size)
68  sport->tx_pos %= runtime->buffer_size;
69  sport->tx_delay_pos = sport->tx_pos;
70  } else {
71  bf5xx_ac97_to_pcm((struct ac97_frame *)sport->rx_dma_buf +
72  sport->rx_pos, (__u16 *)runtime->dma_area + sport->rx_pos *
73  runtime->channels, count);
74  sport->rx_pos += runtime->period_size;
75  if (sport->rx_pos >= runtime->buffer_size)
76  sport->rx_pos %= runtime->buffer_size;
77  }
78 }
79 #endif
80 
81 static void bf5xx_dma_irq(void *data)
82 {
83  struct snd_pcm_substream *pcm = data;
84 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
85  struct snd_pcm_runtime *runtime = pcm->runtime;
86  struct sport_device *sport = runtime->private_data;
87  bf5xx_mmap_copy(pcm, runtime->period_size);
88  if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK) {
89  if (sport->once == 0) {
90  snd_pcm_period_elapsed(pcm);
91  bf5xx_mmap_copy(pcm, runtime->period_size);
92  sport->once = 1;
93  }
94  }
95 #endif
96  snd_pcm_period_elapsed(pcm);
97 }
98 
99 /* The memory size for pure pcm data is 128*1024 = 0x20000 bytes.
100  * The total rx/tx buffer is for ac97 frame to hold all pcm data
101  * is 0x20000 * sizeof(struct ac97_frame) / 4.
102  */
103 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
104  .info = SNDRV_PCM_INFO_INTERLEAVED |
105 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
106  SNDRV_PCM_INFO_MMAP |
107  SNDRV_PCM_INFO_MMAP_VALID |
108 #endif
109  SNDRV_PCM_INFO_BLOCK_TRANSFER,
110 
111  .formats = SNDRV_PCM_FMTBIT_S16_LE,
112  .period_bytes_min = 32,
113  .period_bytes_max = 0x10000,
114  .periods_min = 1,
115  .periods_max = PAGE_SIZE/32,
116  .buffer_bytes_max = 0x20000, /* 128 kbytes */
117  .fifo_size = 16,
118 };
119 
120 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
121  struct snd_pcm_hw_params *params)
122 {
123  size_t size = bf5xx_pcm_hardware.buffer_bytes_max
124  * sizeof(struct ac97_frame) / 4;
125 
126  snd_pcm_lib_malloc_pages(substream, size);
127 
128  return 0;
129 }
130 
131 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
132 {
133 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
134  struct snd_pcm_runtime *runtime = substream->runtime;
135  struct sport_device *sport = runtime->private_data;
136 
137  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
138  sport->once = 0;
139  if (runtime->dma_area)
140  memset(runtime->dma_area, 0, runtime->buffer_size);
141  memset(sport->tx_dma_buf, 0, runtime->buffer_size *
142  sizeof(struct ac97_frame));
143  } else
144  memset(sport->rx_dma_buf, 0, runtime->buffer_size *
145  sizeof(struct ac97_frame));
146 #endif
147  snd_pcm_lib_free_pages(substream);
148  return 0;
149 }
150 
151 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
152 {
153  struct snd_pcm_runtime *runtime = substream->runtime;
154  struct sport_device *sport = runtime->private_data;
155 
156  /* An intermediate buffer is introduced for implementing mmap for
157  * SPORT working in TMD mode(include AC97).
158  */
159 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
160  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
161  sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
162  sport_config_tx_dma(sport, sport->tx_dma_buf, runtime->periods,
163  runtime->period_size * sizeof(struct ac97_frame));
164  } else {
165  sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
166  sport_config_rx_dma(sport, sport->rx_dma_buf, runtime->periods,
167  runtime->period_size * sizeof(struct ac97_frame));
168  }
169 #else
170  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
171  sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
172  sport_config_tx_dma(sport, runtime->dma_area, runtime->periods,
173  runtime->period_size * sizeof(struct ac97_frame));
174  } else {
175  sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
176  sport_config_rx_dma(sport, runtime->dma_area, runtime->periods,
177  runtime->period_size * sizeof(struct ac97_frame));
178  }
179 #endif
180  return 0;
181 }
182 
183 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
184 {
185  struct snd_pcm_runtime *runtime = substream->runtime;
186  struct sport_device *sport = runtime->private_data;
187  int ret = 0;
188 
189  pr_debug("%s enter\n", __func__);
190  switch (cmd) {
191  case SNDRV_PCM_TRIGGER_START:
192  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
193 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
194  bf5xx_mmap_copy(substream, runtime->period_size);
195  sport->tx_delay_pos = 0;
196 #endif
197  sport_tx_start(sport);
198  } else
199  sport_rx_start(sport);
200  break;
201  case SNDRV_PCM_TRIGGER_STOP:
202  case SNDRV_PCM_TRIGGER_SUSPEND:
203  case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
204  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
205 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
206  sport->tx_pos = 0;
207 #endif
208  sport_tx_stop(sport);
209  } else {
210 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
211  sport->rx_pos = 0;
212 #endif
213  sport_rx_stop(sport);
214  }
215  break;
216  default:
217  ret = -EINVAL;
218  }
219  return ret;
220 }
221 
222 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
223 {
224  struct snd_pcm_runtime *runtime = substream->runtime;
225  struct sport_device *sport = runtime->private_data;
226  unsigned int curr;
227 
228 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
229  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
230  curr = sport->tx_delay_pos;
231  else
232  curr = sport->rx_pos;
233 #else
234 
235  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
236  curr = sport_curr_offset_tx(sport) / sizeof(struct ac97_frame);
237  else
238  curr = sport_curr_offset_rx(sport) / sizeof(struct ac97_frame);
239 
240 #endif
241  return curr;
242 }
243 
244 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
245 {
246  struct snd_soc_pcm_runtime *rtd = substream->private_data;
247  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
248  struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
249  struct snd_pcm_runtime *runtime = substream->runtime;
250  int ret;
251 
252  pr_debug("%s enter\n", __func__);
253  snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
254 
255  ret = snd_pcm_hw_constraint_integer(runtime,
256  SNDRV_PCM_HW_PARAM_PERIODS);
257  if (ret < 0)
258  goto out;
259 
260  if (sport_handle != NULL)
261  runtime->private_data = sport_handle;
262  else {
263  pr_err("sport_handle is NULL\n");
264  return -1;
265  }
266  return 0;
267 
268  out:
269  return ret;
270 }
271 
272 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
273 static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
274  struct vm_area_struct *vma)
275 {
276  struct snd_pcm_runtime *runtime = substream->runtime;
277  size_t size = vma->vm_end - vma->vm_start;
278  vma->vm_start = (unsigned long)runtime->dma_area;
279  vma->vm_end = vma->vm_start + size;
280  vma->vm_flags |= VM_SHARED;
281  return 0 ;
282 }
283 #else
284 static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
285  snd_pcm_uframes_t pos,
286  void __user *buf, snd_pcm_uframes_t count)
287 {
288  struct snd_pcm_runtime *runtime = substream->runtime;
289  unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
290  pr_debug("%s copy pos:0x%lx count:0x%lx\n",
291  substream->stream ? "Capture" : "Playback", pos, count);
292 
293  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
294  bf5xx_pcm_to_ac97((struct ac97_frame *)runtime->dma_area + pos,
295  (__u16 *)buf, count, chan_mask);
296  else
297  bf5xx_ac97_to_pcm((struct ac97_frame *)runtime->dma_area + pos,
298  (__u16 *)buf, count);
299  return 0;
300 }
301 #endif
302 
303 static struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
304  .open = bf5xx_pcm_open,
305  .ioctl = snd_pcm_lib_ioctl,
306  .hw_params = bf5xx_pcm_hw_params,
307  .hw_free = bf5xx_pcm_hw_free,
308  .prepare = bf5xx_pcm_prepare,
309  .trigger = bf5xx_pcm_trigger,
310  .pointer = bf5xx_pcm_pointer,
311 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
312  .mmap = bf5xx_pcm_mmap,
313 #else
314  .copy = bf5xx_pcm_copy,
315 #endif
316 };
317 
318 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
319 {
320  struct snd_soc_pcm_runtime *rtd = pcm->private_data;
321  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
322  struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
323  struct snd_pcm_substream *substream = pcm->streams[stream].substream;
324  struct snd_dma_buffer *buf = &substream->dma_buffer;
325  size_t size = bf5xx_pcm_hardware.buffer_bytes_max
326  * sizeof(struct ac97_frame) / 4;
327 
328  buf->dev.type = SNDRV_DMA_TYPE_DEV;
329  buf->dev.dev = pcm->card->dev;
330  buf->private_data = NULL;
331  buf->area = dma_alloc_coherent(pcm->card->dev, size,
332  &buf->addr, GFP_KERNEL);
333  if (!buf->area) {
334  pr_err("Failed to allocate dma memory\n");
335  pr_err("Please increase uncached DMA memory region\n");
336  return -ENOMEM;
337  }
338  buf->bytes = size;
339 
340  pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
341  buf->area, buf->bytes);
342 
343  if (stream == SNDRV_PCM_STREAM_PLAYBACK)
344  sport_handle->tx_buf = buf->area;
345  else
346  sport_handle->rx_buf = buf->area;
347 
348 /*
349  * Need to allocate local buffer when enable
350  * MMAP for SPORT working in TMD mode (include AC97).
351  */
352 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
353  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
354  if (!sport_handle->tx_dma_buf) {
355  sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
356  size, &sport_handle->tx_dma_phy, GFP_KERNEL);
357  if (!sport_handle->tx_dma_buf) {
358  pr_err("Failed to allocate memory for tx dma buf - Please increase uncached DMA memory region\n");
359  return -ENOMEM;
360  } else
361  memset(sport_handle->tx_dma_buf, 0, size);
362  } else
363  memset(sport_handle->tx_dma_buf, 0, size);
364  } else {
365  if (!sport_handle->rx_dma_buf) {
366  sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
367  size, &sport_handle->rx_dma_phy, GFP_KERNEL);
368  if (!sport_handle->rx_dma_buf) {
369  pr_err("Failed to allocate memory for rx dma buf - Please increase uncached DMA memory region\n");
370  return -ENOMEM;
371  } else
372  memset(sport_handle->rx_dma_buf, 0, size);
373  } else
374  memset(sport_handle->rx_dma_buf, 0, size);
375  }
376 #endif
377  return 0;
378 }
379 
380 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
381 {
382  struct snd_pcm_substream *substream;
383  struct snd_dma_buffer *buf;
384  int stream;
385 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
386  struct snd_soc_pcm_runtime *rtd = pcm->private_data;
387  struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
388  struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
389  size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
390  sizeof(struct ac97_frame) / 4;
391 #endif
392  for (stream = 0; stream < 2; stream++) {
393  substream = pcm->streams[stream].substream;
394  if (!substream)
395  continue;
396 
397  buf = &substream->dma_buffer;
398  if (!buf->area)
399  continue;
400  dma_free_coherent(NULL, buf->bytes, buf->area, 0);
401  buf->area = NULL;
402 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
403  if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
404  if (sport_handle->tx_dma_buf)
405  dma_free_coherent(NULL, size, \
406  sport_handle->tx_dma_buf, 0);
407  sport_handle->tx_dma_buf = NULL;
408  } else {
409 
410  if (sport_handle->rx_dma_buf)
411  dma_free_coherent(NULL, size, \
412  sport_handle->rx_dma_buf, 0);
413  sport_handle->rx_dma_buf = NULL;
414  }
415 #endif
416  }
417 }
418 
419 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
420 
421 static int bf5xx_pcm_ac97_new(struct snd_soc_pcm_runtime *rtd)
422 {
423  struct snd_card *card = rtd->card->snd_card;
424  struct snd_pcm *pcm = rtd->pcm;
425  int ret = 0;
426 
427  pr_debug("%s enter\n", __func__);
428  if (!card->dev->dma_mask)
429  card->dev->dma_mask = &bf5xx_pcm_dmamask;
430  if (!card->dev->coherent_dma_mask)
431  card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
432 
433  if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
434  ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
435  SNDRV_PCM_STREAM_PLAYBACK);
436  if (ret)
437  goto out;
438  }
439 
440  if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
441  ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
442  SNDRV_PCM_STREAM_CAPTURE);
443  if (ret)
444  goto out;
445  }
446  out:
447  return ret;
448 }
449 
450 static struct snd_soc_platform_driver bf5xx_ac97_soc_platform = {
451  .ops = &bf5xx_pcm_ac97_ops,
452  .pcm_new = bf5xx_pcm_ac97_new,
453  .pcm_free = bf5xx_pcm_free_dma_buffers,
454 };
455 
456 static int __devinit bf5xx_soc_platform_probe(struct platform_device *pdev)
457 {
458  return snd_soc_register_platform(&pdev->dev, &bf5xx_ac97_soc_platform);
459 }
460 
461 static int __devexit bf5xx_soc_platform_remove(struct platform_device *pdev)
462 {
463  snd_soc_unregister_platform(&pdev->dev);
464  return 0;
465 }
466 
467 static struct platform_driver bf5xx_pcm_driver = {
468  .driver = {
469  .name = "bfin-ac97-pcm-audio",
470  .owner = THIS_MODULE,
471  },
472 
473  .probe = bf5xx_soc_platform_probe,
474  .remove = __devexit_p(bf5xx_soc_platform_remove),
475 };
476 
477 module_platform_driver(bf5xx_pcm_driver);
478 
479 MODULE_AUTHOR("Cliff Cai");
480 MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
481 MODULE_LICENSE("GPL");
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