sound/soc/omap/omap-pcm.c

   1 /*
   2  * omap-pcm.c  --  ALSA PCM interface for the OMAP SoC
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  *
   6  * Contact: Jarkko Nikula <jhnikula@gmail.com>
   7  *          Peter Ujfalusi <peter.ujfalusi@nokia.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  21  * 02110-1301 USA
  22  *
  23  */
  24
  25 #include <linux/dma-mapping.h>
  26 #include <linux/slab.h>
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/soc.h>
  31
  32 #include <plat/dma.h>
  33 #include "omap-pcm.h"
  34
  35 static const struct snd_pcm_hardware omap_pcm_hardware = {
  36         .info                   = SNDRV_PCM_INFO_MMAP |
  37                                   SNDRV_PCM_INFO_MMAP_VALID |
  38                                   SNDRV_PCM_INFO_INTERLEAVED |
  39                                   SNDRV_PCM_INFO_PAUSE |
  40                                   SNDRV_PCM_INFO_RESUME,
  41         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  42                                   SNDRV_PCM_FMTBIT_S32_LE,
  43         .period_bytes_min       = 32,
  44         .period_bytes_max       = 64 * 1024,
  45         .periods_min            = 2,
  46         .periods_max            = 255,
  47         .buffer_bytes_max       = 128 * 1024,
  48 };
  49
  50 struct omap_runtime_data {
  51         spinlock_t                      lock;
  52         struct omap_pcm_dma_data        *dma_data;
  53         int                             dma_ch;
  54         int                             period_index;
  55 };
  56
  57 static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
  58 {
  59         struct snd_pcm_substream *substream = data;
  60         struct snd_pcm_runtime *runtime = substream->runtime;
  61         struct omap_runtime_data *prtd = runtime->private_data;
  62         unsigned long flags;
  63
  64         if ((cpu_is_omap1510())) {
  65                 /*
  66                  * OMAP1510 doesn't fully support DMA progress counter
  67                  * and there is no software emulation implemented yet,
  68                  * so have to maintain our own progress counters
  69                  * that can be used by omap_pcm_pointer() instead.
  70                  */
  71                 spin_lock_irqsave(&prtd->lock, flags);
  72                 if ((stat == OMAP_DMA_LAST_IRQ) &&
  73                                 (prtd->period_index == runtime->periods - 1)) {
  74                         /* we are in sync, do nothing */
  75                         spin_unlock_irqrestore(&prtd->lock, flags);
  76                         return;
  77                 }
  78                 if (prtd->period_index >= 0) {
  79                         if (stat & OMAP_DMA_BLOCK_IRQ) {
  80                                 /* end of buffer reached, loop back */
  81                                 prtd->period_index = 0;
  82                         } else if (stat & OMAP_DMA_LAST_IRQ) {
  83                                 /* update the counter for the last period */
  84                                 prtd->period_index = runtime->periods - 1;
  85                         } else if (++prtd->period_index >= runtime->periods) {
  86                                 /* end of buffer missed? loop back */
  87                                 prtd->period_index = 0;
  88                         }
  89                 }
  90                 spin_unlock_irqrestore(&prtd->lock, flags);
  91         }
  92
  93         snd_pcm_period_elapsed(substream);
  94 }
  95
  96 /* this may get called several times by oss emulation */
  97 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
  98                               struct snd_pcm_hw_params *params)
  99 {
 100         struct snd_pcm_runtime *runtime = substream->runtime;
 101         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 102         struct omap_runtime_data *prtd = runtime->private_data;
 103         struct omap_pcm_dma_data *dma_data;
 104
 105         int err = 0;
 106
 107         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 108
 109         /* return if this is a bufferless transfer e.g.
 110          * codec <--> BT codec or GSM modem -- lg FIXME */
 111         if (!dma_data)
 112                 return 0;
 113
 114         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 115         runtime->dma_bytes = params_buffer_bytes(params);
 116
 117         if (prtd->dma_data)
 118                 return 0;
 119         prtd->dma_data = dma_data;
 120         err = omap_request_dma(dma_data->dma_req, dma_data->name,
 121                                omap_pcm_dma_irq, substream, &prtd->dma_ch);
 122         if (!err) {
 123                 /*
 124                  * Link channel with itself so DMA doesn't need any
 125                  * reprogramming while looping the buffer
 126                  */
 127                 omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
 128         }
 129
 130         return err;
 131 }
 132
 133 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 134 {
 135         struct snd_pcm_runtime *runtime = substream->runtime;
 136         struct omap_runtime_data *prtd = runtime->private_data;
 137
 138         if (prtd->dma_data == NULL)
 139                 return 0;
 140
 141         omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
 142         omap_free_dma(prtd->dma_ch);
 143         prtd->dma_data = NULL;
 144
 145         snd_pcm_set_runtime_buffer(substream, NULL);
 146
 147         return 0;
 148 }
 149
 150 static int omap_pcm_prepare(struct snd_pcm_substream *substream)
 151 {
 152         struct snd_pcm_runtime *runtime = substream->runtime;
 153         struct omap_runtime_data *prtd = runtime->private_data;
 154         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
 155         struct omap_dma_channel_params dma_params;
 156         int bytes;
 157
 158         /* return if this is a bufferless transfer e.g.
 159          * codec <--> BT codec or GSM modem -- lg FIXME */
 160         if (!prtd->dma_data)
 161                 return 0;
 162
 163         memset(&dma_params, 0, sizeof(dma_params));
 164         dma_params.data_type                    = dma_data->data_type;
 165         dma_params.trigger                      = dma_data->dma_req;
 166         dma_params.sync_mode                    = dma_data->sync_mode;
 167         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 168                 dma_params.src_amode            = OMAP_DMA_AMODE_POST_INC;
 169                 dma_params.dst_amode            = OMAP_DMA_AMODE_CONSTANT;
 170                 dma_params.src_or_dst_synch     = OMAP_DMA_DST_SYNC;
 171                 dma_params.src_start            = runtime->dma_addr;
 172                 dma_params.dst_start            = dma_data->port_addr;
 173                 dma_params.dst_port             = OMAP_DMA_PORT_MPUI;
 174                 dma_params.dst_fi               = dma_data->packet_size;
 175         } else {
 176                 dma_params.src_amode            = OMAP_DMA_AMODE_CONSTANT;
 177                 dma_params.dst_amode            = OMAP_DMA_AMODE_POST_INC;
 178                 dma_params.src_or_dst_synch     = OMAP_DMA_SRC_SYNC;
 179                 dma_params.src_start            = dma_data->port_addr;
 180                 dma_params.dst_start            = runtime->dma_addr;
 181                 dma_params.src_port             = OMAP_DMA_PORT_MPUI;
 182                 dma_params.src_fi               = dma_data->packet_size;
 183         }
 184         /*
 185          * Set DMA transfer frame size equal to ALSA period size and frame
 186          * count as no. of ALSA periods. Then with DMA frame interrupt enabled,
 187          * we can transfer the whole ALSA buffer with single DMA transfer but
 188          * still can get an interrupt at each period bounary
 189          */
 190         bytes = snd_pcm_lib_period_bytes(substream);
 191         dma_params.elem_count   = bytes >> dma_data->data_type;
 192         dma_params.frame_count  = runtime->periods;
 193         omap_set_dma_params(prtd->dma_ch, &dma_params);
 194
 195         if ((cpu_is_omap1510()))
 196                 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ |
 197                               OMAP_DMA_LAST_IRQ | OMAP_DMA_BLOCK_IRQ);
 198         else
 199                 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
 200
 201         if (!(cpu_class_is_omap1())) {
 202                 omap_set_dma_src_burst_mode(prtd->dma_ch,
 203                                                 OMAP_DMA_DATA_BURST_16);
 204                 omap_set_dma_dest_burst_mode(prtd->dma_ch,
 205                                                 OMAP_DMA_DATA_BURST_16);
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 212 {
 213         struct snd_pcm_runtime *runtime = substream->runtime;
 214         struct omap_runtime_data *prtd = runtime->private_data;
 215         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
 216         unsigned long flags;
 217         int ret = 0;
 218
 219         spin_lock_irqsave(&prtd->lock, flags);
 220         switch (cmd) {
 221         case SNDRV_PCM_TRIGGER_START:
 222         case SNDRV_PCM_TRIGGER_RESUME:
 223         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 224                 prtd->period_index = 0;
 225                 /* Configure McBSP internal buffer usage */
 226                 if (dma_data->set_threshold)
 227                         dma_data->set_threshold(substream);
 228
 229                 omap_start_dma(prtd->dma_ch);
 230                 break;
 231
 232         case SNDRV_PCM_TRIGGER_STOP:
 233         case SNDRV_PCM_TRIGGER_SUSPEND:
 234         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 235                 prtd->period_index = -1;
 236                 omap_stop_dma(prtd->dma_ch);
 237                 break;
 238         default:
 239                 ret = -EINVAL;
 240         }
 241         spin_unlock_irqrestore(&prtd->lock, flags);
 242
 243         return ret;
 244 }
 245
 246 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
 247 {
 248         struct snd_pcm_runtime *runtime = substream->runtime;
 249         struct omap_runtime_data *prtd = runtime->private_data;
 250         dma_addr_t ptr;
 251         snd_pcm_uframes_t offset;
 252
 253         if (cpu_is_omap1510()) {
 254                 offset = prtd->period_index * runtime->period_size;
 255         } else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 256                 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
 257                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 258         } else {
 259                 ptr = omap_get_dma_src_pos(prtd->dma_ch);
 260                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 261         }
 262
 263         if (offset >= runtime->buffer_size)
 264                 offset = 0;
 265
 266         return offset;
 267 }
 268
 269 static int omap_pcm_open(struct snd_pcm_substream *substream)
 270 {
 271         struct snd_pcm_runtime *runtime = substream->runtime;
 272         struct omap_runtime_data *prtd;
 273         int ret;
 274
 275         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 276
 277         /* Ensure that buffer size is a multiple of period size */
 278         ret = snd_pcm_hw_constraint_integer(runtime,
 279                                             SNDRV_PCM_HW_PARAM_PERIODS);
 280         if (ret < 0)
 281                 goto out;
 282
 283         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
 284         if (prtd == NULL) {
 285                 ret = -ENOMEM;
 286                 goto out;
 287         }
 288         spin_lock_init(&prtd->lock);
 289         runtime->private_data = prtd;
 290
 291 out:
 292         return ret;
 293 }
 294
 295 static int omap_pcm_close(struct snd_pcm_substream *substream)
 296 {
 297         struct snd_pcm_runtime *runtime = substream->runtime;
 298
 299         kfree(runtime->private_data);
 300         return 0;
 301 }
 302
 303 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 304         struct vm_area_struct *vma)
 305 {
 306         struct snd_pcm_runtime *runtime = substream->runtime;
 307
 308         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 309                                      runtime->dma_area,
 310                                      runtime->dma_addr,
 311                                      runtime->dma_bytes);
 312 }
 313
 314 static struct snd_pcm_ops omap_pcm_ops = {
 315         .open           = omap_pcm_open,
 316         .close          = omap_pcm_close,
 317         .ioctl          = snd_pcm_lib_ioctl,
 318         .hw_params      = omap_pcm_hw_params,
 319         .hw_free        = omap_pcm_hw_free,
 320         .prepare        = omap_pcm_prepare,
 321         .trigger        = omap_pcm_trigger,
 322         .pointer        = omap_pcm_pointer,
 323         .mmap           = omap_pcm_mmap,
 324 };
 325
 326 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
 327
 328 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 329         int stream)
 330 {
 331         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 332         struct snd_dma_buffer *buf = &substream->dma_buffer;
 333         size_t size = omap_pcm_hardware.buffer_bytes_max;
 334
 335         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 336         buf->dev.dev = pcm->card->dev;
 337         buf->private_data = NULL;
 338         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 339                                            &buf->addr, GFP_KERNEL);
 340         if (!buf->area)
 341                 return -ENOMEM;
 342
 343         buf->bytes = size;
 344         return 0;
 345 }
 346
 347 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
 348 {
 349         struct snd_pcm_substream *substream;
 350         struct snd_dma_buffer *buf;
 351         int stream;
 352
 353         for (stream = 0; stream < 2; stream++) {
 354                 substream = pcm->streams[stream].substream;
 355                 if (!substream)
 356                         continue;
 357
 358                 buf = &substream->dma_buffer;
 359                 if (!buf->area)
 360                         continue;
 361
 362                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 363                                       buf->area, buf->addr);
 364                 buf->area = NULL;
 365         }
 366 }
 367
 368 static int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
 369                  struct snd_pcm *pcm)
 370 {
 371         int ret = 0;
 372
 373         if (!card->dev->dma_mask)
 374                 card->dev->dma_mask = &omap_pcm_dmamask;
 375         if (!card->dev->coherent_dma_mask)
 376                 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
 377
 378         if (dai->driver->playback.channels_min) {
 379                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 380                         SNDRV_PCM_STREAM_PLAYBACK);
 381                 if (ret)
 382                         goto out;
 383         }
 384
 385         if (dai->driver->capture.channels_min) {
 386                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 387                         SNDRV_PCM_STREAM_CAPTURE);
 388                 if (ret)
 389                         goto out;
 390         }
 391
 392 out:
 393         return ret;
 394 }
 395
 396 static struct snd_soc_platform_driver omap_soc_platform = {
 397         .ops            = &omap_pcm_ops,
 398         .pcm_new        = omap_pcm_new,
 399         .pcm_free       = omap_pcm_free_dma_buffers,
 400 };
 401
 402 static __devinit int omap_pcm_probe(struct platform_device *pdev)
 403 {
 404         return snd_soc_register_platform(&pdev->dev,
 405                         &omap_soc_platform);
 406 }
 407
 408 static int __devexit omap_pcm_remove(struct platform_device *pdev)
 409 {
 410         snd_soc_unregister_platform(&pdev->dev);
 411         return 0;
 412 }
 413
 414 static struct platform_driver omap_pcm_driver = {
 415         .driver = {
 416                         .name = "omap-pcm-audio",
 417                         .owner = THIS_MODULE,
 418         },
 419
 420         .probe = omap_pcm_probe,
 421         .remove = __devexit_p(omap_pcm_remove),
 422 };
 423
 424 static int __init snd_omap_pcm_init(void)
 425 {
 426         return platform_driver_register(&omap_pcm_driver);
 427 }
 428 module_init(snd_omap_pcm_init);
 429
 430 static void __exit snd_omap_pcm_exit(void)
 431 {
 432         platform_driver_unregister(&omap_pcm_driver);
 433 }
 434 module_exit(snd_omap_pcm_exit);
 435
 436 MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
 437 MODULE_DESCRIPTION("OMAP PCM DMA module");
 438 MODULE_LICENSE("GPL");