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