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 <jarkko.nikula@bitmer.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         else {
 202                 /*
 203                  * No period wakeup:
 204                  * we need to disable BLOCK_IRQ, which is enabled by the omap
 205                  * dma core at request dma time.
 206                  */
 207                 omap_disable_dma_irq(prtd->dma_ch, OMAP_DMA_BLOCK_IRQ);
 208         }
 209
 210         if (!(cpu_class_is_omap1())) {
 211                 omap_set_dma_src_burst_mode(prtd->dma_ch,
 212                                                 OMAP_DMA_DATA_BURST_16);
 213                 omap_set_dma_dest_burst_mode(prtd->dma_ch,
 214                                                 OMAP_DMA_DATA_BURST_16);
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 221 {
 222         struct snd_pcm_runtime *runtime = substream->runtime;
 223         struct omap_runtime_data *prtd = runtime->private_data;
 224         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
 225         unsigned long flags;
 226         int ret = 0;
 227
 228         spin_lock_irqsave(&prtd->lock, flags);
 229         switch (cmd) {
 230         case SNDRV_PCM_TRIGGER_START:
 231         case SNDRV_PCM_TRIGGER_RESUME:
 232         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 233                 prtd->period_index = 0;
 234                 /* Configure McBSP internal buffer usage */
 235                 if (dma_data->set_threshold)
 236                         dma_data->set_threshold(substream);
 237
 238                 omap_start_dma(prtd->dma_ch);
 239                 break;
 240
 241         case SNDRV_PCM_TRIGGER_STOP:
 242         case SNDRV_PCM_TRIGGER_SUSPEND:
 243         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 244                 prtd->period_index = -1;
 245                 omap_stop_dma(prtd->dma_ch);
 246                 break;
 247         default:
 248                 ret = -EINVAL;
 249         }
 250         spin_unlock_irqrestore(&prtd->lock, flags);
 251
 252         return ret;
 253 }
 254
 255 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
 256 {
 257         struct snd_pcm_runtime *runtime = substream->runtime;
 258         struct omap_runtime_data *prtd = runtime->private_data;
 259         dma_addr_t ptr;
 260         snd_pcm_uframes_t offset;
 261
 262         if (cpu_is_omap1510()) {
 263                 offset = prtd->period_index * runtime->period_size;
 264         } else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 265                 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
 266                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 267         } else {
 268                 ptr = omap_get_dma_src_pos(prtd->dma_ch);
 269                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 270         }
 271
 272         if (offset >= runtime->buffer_size)
 273                 offset = 0;
 274
 275         return offset;
 276 }
 277
 278 static int omap_pcm_open(struct snd_pcm_substream *substream)
 279 {
 280         struct snd_pcm_runtime *runtime = substream->runtime;
 281         struct omap_runtime_data *prtd;
 282         int ret;
 283
 284         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 285
 286         /* Ensure that buffer size is a multiple of period size */
 287         ret = snd_pcm_hw_constraint_integer(runtime,
 288                                             SNDRV_PCM_HW_PARAM_PERIODS);
 289         if (ret < 0)
 290                 goto out;
 291
 292         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
 293         if (prtd == NULL) {
 294                 ret = -ENOMEM;
 295                 goto out;
 296         }
 297         spin_lock_init(&prtd->lock);
 298         runtime->private_data = prtd;
 299
 300 out:
 301         return ret;
 302 }
 303
 304 static int omap_pcm_close(struct snd_pcm_substream *substream)
 305 {
 306         struct snd_pcm_runtime *runtime = substream->runtime;
 307
 308         kfree(runtime->private_data);
 309         return 0;
 310 }
 311
 312 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 313         struct vm_area_struct *vma)
 314 {
 315         struct snd_pcm_runtime *runtime = substream->runtime;
 316
 317         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 318                                      runtime->dma_area,
 319                                      runtime->dma_addr,
 320                                      runtime->dma_bytes);
 321 }
 322
 323 static struct snd_pcm_ops omap_pcm_ops = {
 324         .open           = omap_pcm_open,
 325         .close          = omap_pcm_close,
 326         .ioctl          = snd_pcm_lib_ioctl,
 327         .hw_params      = omap_pcm_hw_params,
 328         .hw_free        = omap_pcm_hw_free,
 329         .prepare        = omap_pcm_prepare,
 330         .trigger        = omap_pcm_trigger,
 331         .pointer        = omap_pcm_pointer,
 332         .mmap           = omap_pcm_mmap,
 333 };
 334
 335 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
 336
 337 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 338         int stream)
 339 {
 340         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 341         struct snd_dma_buffer *buf = &substream->dma_buffer;
 342         size_t size = omap_pcm_hardware.buffer_bytes_max;
 343
 344         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 345         buf->dev.dev = pcm->card->dev;
 346         buf->private_data = NULL;
 347         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 348                                            &buf->addr, GFP_KERNEL);
 349         if (!buf->area)
 350                 return -ENOMEM;
 351
 352         buf->bytes = size;
 353         return 0;
 354 }
 355
 356 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
 357 {
 358         struct snd_pcm_substream *substream;
 359         struct snd_dma_buffer *buf;
 360         int stream;
 361
 362         for (stream = 0; stream < 2; stream++) {
 363                 substream = pcm->streams[stream].substream;
 364                 if (!substream)
 365                         continue;
 366
 367                 buf = &substream->dma_buffer;
 368                 if (!buf->area)
 369                         continue;
 370
 371                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 372                                       buf->area, buf->addr);
 373                 buf->area = NULL;
 374         }
 375 }
 376
 377 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
 378 {
 379         struct snd_card *card = rtd->card->snd_card;
 380         struct snd_soc_dai *dai = rtd->cpu_dai;
 381         struct snd_pcm *pcm = rtd->pcm;
 382         int ret = 0;
 383
 384         if (!card->dev->dma_mask)
 385                 card->dev->dma_mask = &omap_pcm_dmamask;
 386         if (!card->dev->coherent_dma_mask)
 387                 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
 388
 389         if (dai->driver->playback.channels_min) {
 390                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 391                         SNDRV_PCM_STREAM_PLAYBACK);
 392                 if (ret)
 393                         goto out;
 394         }
 395
 396         if (dai->driver->capture.channels_min) {
 397                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 398                         SNDRV_PCM_STREAM_CAPTURE);
 399                 if (ret)
 400                         goto out;
 401         }
 402
 403 out:
 404         return ret;
 405 }
 406
 407 static struct snd_soc_platform_driver omap_soc_platform = {
 408         .ops            = &omap_pcm_ops,
 409         .pcm_new        = omap_pcm_new,
 410         .pcm_free       = omap_pcm_free_dma_buffers,
 411 };
 412
 413 static __devinit int omap_pcm_probe(struct platform_device *pdev)
 414 {
 415         return snd_soc_register_platform(&pdev->dev,
 416                         &omap_soc_platform);
 417 }
 418
 419 static int __devexit omap_pcm_remove(struct platform_device *pdev)
 420 {
 421         snd_soc_unregister_platform(&pdev->dev);
 422         return 0;
 423 }
 424
 425 static struct platform_driver omap_pcm_driver = {
 426         .driver = {
 427                         .name = "omap-pcm-audio",
 428                         .owner = THIS_MODULE,
 429         },
 430
 431         .probe = omap_pcm_probe,
 432         .remove = __devexit_p(omap_pcm_remove),
 433 };
 434
 435 static int __init snd_omap_pcm_init(void)
 436 {
 437         return platform_driver_register(&omap_pcm_driver);
 438 }
 439 module_init(snd_omap_pcm_init);
 440
 441 static void __exit snd_omap_pcm_exit(void)
 442 {
 443         platform_driver_unregister(&omap_pcm_driver);
 444 }
 445 module_exit(snd_omap_pcm_exit);
 446
 447 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
 448 MODULE_DESCRIPTION("OMAP PCM DMA module");
 449 MODULE_LICENSE("GPL");