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 <linux/module.h>
  28 #include <sound/core.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31 #include <sound/soc.h>
  32
  33 #include <plat/dma.h>
  34 #include "omap-pcm.h"
  35
  36 static const struct snd_pcm_hardware omap_pcm_hardware = {
  37         .info                   = SNDRV_PCM_INFO_MMAP |
  38                                   SNDRV_PCM_INFO_MMAP_VALID |
  39                                   SNDRV_PCM_INFO_INTERLEAVED |
  40                                   SNDRV_PCM_INFO_PAUSE |
  41                                   SNDRV_PCM_INFO_RESUME |
  42                                   SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
  43         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  44                                   SNDRV_PCM_FMTBIT_S32_LE,
  45         .period_bytes_min       = 32,
  46         .period_bytes_max       = 64 * 1024,
  47         .periods_min            = 2,
  48         .periods_max            = 255,
  49         .buffer_bytes_max       = 128 * 1024,
  50 };
  51
  52 struct omap_runtime_data {
  53         spinlock_t                      lock;
  54         struct omap_pcm_dma_data        *dma_data;
  55         int                             dma_ch;
  56         int                             period_index;
  57 };
  58
  59 static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
  60 {
  61         struct snd_pcm_substream *substream = data;
  62         struct snd_pcm_runtime *runtime = substream->runtime;
  63         struct omap_runtime_data *prtd = runtime->private_data;
  64         unsigned long flags;
  65
  66         if ((cpu_is_omap1510())) {
  67                 /*
  68                  * OMAP1510 doesn't fully support DMA progress counter
  69                  * and there is no software emulation implemented yet,
  70                  * so have to maintain our own progress counters
  71                  * that can be used by omap_pcm_pointer() instead.
  72                  */
  73                 spin_lock_irqsave(&prtd->lock, flags);
  74                 if ((stat == OMAP_DMA_LAST_IRQ) &&
  75                                 (prtd->period_index == runtime->periods - 1)) {
  76                         /* we are in sync, do nothing */
  77                         spin_unlock_irqrestore(&prtd->lock, flags);
  78                         return;
  79                 }
  80                 if (prtd->period_index >= 0) {
  81                         if (stat & OMAP_DMA_BLOCK_IRQ) {
  82                                 /* end of buffer reached, loop back */
  83                                 prtd->period_index = 0;
  84                         } else if (stat & OMAP_DMA_LAST_IRQ) {
  85                                 /* update the counter for the last period */
  86                                 prtd->period_index = runtime->periods - 1;
  87                         } else if (++prtd->period_index >= runtime->periods) {
  88                                 /* end of buffer missed? loop back */
  89                                 prtd->period_index = 0;
  90                         }
  91                 }
  92                 spin_unlock_irqrestore(&prtd->lock, flags);
  93         }
  94
  95         snd_pcm_period_elapsed(substream);
  96 }
  97
  98 /* this may get called several times by oss emulation */
  99 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
 100                               struct snd_pcm_hw_params *params)
 101 {
 102         struct snd_pcm_runtime *runtime = substream->runtime;
 103         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 104         struct omap_runtime_data *prtd = runtime->private_data;
 105         struct omap_pcm_dma_data *dma_data;
 106
 107         int err = 0;
 108
 109         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 110
 111         /* return if this is a bufferless transfer e.g.
 112          * codec <--> BT codec or GSM modem -- lg FIXME */
 113         if (!dma_data)
 114                 return 0;
 115
 116         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 117         runtime->dma_bytes = params_buffer_bytes(params);
 118
 119         if (prtd->dma_data)
 120                 return 0;
 121         prtd->dma_data = dma_data;
 122         err = omap_request_dma(dma_data->dma_req, dma_data->name,
 123                                omap_pcm_dma_irq, substream, &prtd->dma_ch);
 124         if (!err) {
 125                 /*
 126                  * Link channel with itself so DMA doesn't need any
 127                  * reprogramming while looping the buffer
 128                  */
 129                 omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
 130         }
 131
 132         return err;
 133 }
 134
 135 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 136 {
 137         struct snd_pcm_runtime *runtime = substream->runtime;
 138         struct omap_runtime_data *prtd = runtime->private_data;
 139
 140         if (prtd->dma_data == NULL)
 141                 return 0;
 142
 143         omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
 144         omap_free_dma(prtd->dma_ch);
 145         prtd->dma_data = NULL;
 146
 147         snd_pcm_set_runtime_buffer(substream, NULL);
 148
 149         return 0;
 150 }
 151
 152 static int omap_pcm_prepare(struct snd_pcm_substream *substream)
 153 {
 154         struct snd_pcm_runtime *runtime = substream->runtime;
 155         struct omap_runtime_data *prtd = runtime->private_data;
 156         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
 157         struct omap_dma_channel_params dma_params;
 158         int bytes;
 159
 160         /* return if this is a bufferless transfer e.g.
 161          * codec <--> BT codec or GSM modem -- lg FIXME */
 162         if (!prtd->dma_data)
 163                 return 0;
 164
 165         memset(&dma_params, 0, sizeof(dma_params));
 166         dma_params.data_type                    = dma_data->data_type;
 167         dma_params.trigger                      = dma_data->dma_req;
 168         dma_params.sync_mode                    = dma_data->sync_mode;
 169         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 170                 dma_params.src_amode            = OMAP_DMA_AMODE_POST_INC;
 171                 dma_params.dst_amode            = OMAP_DMA_AMODE_CONSTANT;
 172                 dma_params.src_or_dst_synch     = OMAP_DMA_DST_SYNC;
 173                 dma_params.src_start            = runtime->dma_addr;
 174                 dma_params.dst_start            = dma_data->port_addr;
 175                 dma_params.dst_port             = OMAP_DMA_PORT_MPUI;
 176                 dma_params.dst_fi               = dma_data->packet_size;
 177         } else {
 178                 dma_params.src_amode            = OMAP_DMA_AMODE_CONSTANT;
 179                 dma_params.dst_amode            = OMAP_DMA_AMODE_POST_INC;
 180                 dma_params.src_or_dst_synch     = OMAP_DMA_SRC_SYNC;
 181                 dma_params.src_start            = dma_data->port_addr;
 182                 dma_params.dst_start            = runtime->dma_addr;
 183                 dma_params.src_port             = OMAP_DMA_PORT_MPUI;
 184                 dma_params.src_fi               = dma_data->packet_size;
 185         }
 186         /*
 187          * Set DMA transfer frame size equal to ALSA period size and frame
 188          * count as no. of ALSA periods. Then with DMA frame interrupt enabled,
 189          * we can transfer the whole ALSA buffer with single DMA transfer but
 190          * still can get an interrupt at each period bounary
 191          */
 192         bytes = snd_pcm_lib_period_bytes(substream);
 193         dma_params.elem_count   = bytes >> dma_data->data_type;
 194         dma_params.frame_count  = runtime->periods;
 195         omap_set_dma_params(prtd->dma_ch, &dma_params);
 196
 197         if ((cpu_is_omap1510()))
 198                 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ |
 199                               OMAP_DMA_LAST_IRQ | OMAP_DMA_BLOCK_IRQ);
 200         else if (!substream->runtime->no_period_wakeup)
 201                 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
 202         else {
 203                 /*
 204                  * No period wakeup:
 205                  * we need to disable BLOCK_IRQ, which is enabled by the omap
 206                  * dma core at request dma time.
 207                  */
 208                 omap_disable_dma_irq(prtd->dma_ch, OMAP_DMA_BLOCK_IRQ);
 209         }
 210
 211         if (!(cpu_class_is_omap1())) {
 212                 omap_set_dma_src_burst_mode(prtd->dma_ch,
 213                                                 OMAP_DMA_DATA_BURST_16);
 214                 omap_set_dma_dest_burst_mode(prtd->dma_ch,
 215                                                 OMAP_DMA_DATA_BURST_16);
 216         }
 217
 218         return 0;
 219 }
 220
 221 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 222 {
 223         struct snd_pcm_runtime *runtime = substream->runtime;
 224         struct omap_runtime_data *prtd = runtime->private_data;
 225         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
 226         unsigned long flags;
 227         int ret = 0;
 228
 229         spin_lock_irqsave(&prtd->lock, flags);
 230         switch (cmd) {
 231         case SNDRV_PCM_TRIGGER_START:
 232         case SNDRV_PCM_TRIGGER_RESUME:
 233         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 234                 prtd->period_index = 0;
 235                 /* Configure McBSP internal buffer usage */
 236                 if (dma_data->set_threshold)
 237                         dma_data->set_threshold(substream);
 238
 239                 omap_start_dma(prtd->dma_ch);
 240                 break;
 241
 242         case SNDRV_PCM_TRIGGER_STOP:
 243         case SNDRV_PCM_TRIGGER_SUSPEND:
 244         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 245                 prtd->period_index = -1;
 246                 omap_stop_dma(prtd->dma_ch);
 247                 break;
 248         default:
 249                 ret = -EINVAL;
 250         }
 251         spin_unlock_irqrestore(&prtd->lock, flags);
 252
 253         return ret;
 254 }
 255
 256 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
 257 {
 258         struct snd_pcm_runtime *runtime = substream->runtime;
 259         struct omap_runtime_data *prtd = runtime->private_data;
 260         dma_addr_t ptr;
 261         snd_pcm_uframes_t offset;
 262
 263         if (cpu_is_omap1510()) {
 264                 offset = prtd->period_index * runtime->period_size;
 265         } else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 266                 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
 267                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 268         } else {
 269                 ptr = omap_get_dma_src_pos(prtd->dma_ch);
 270                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 271         }
 272
 273         if (offset >= runtime->buffer_size)
 274                 offset = 0;
 275
 276         return offset;
 277 }
 278
 279 static int omap_pcm_open(struct snd_pcm_substream *substream)
 280 {
 281         struct snd_pcm_runtime *runtime = substream->runtime;
 282         struct omap_runtime_data *prtd;
 283         int ret;
 284
 285         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 286
 287         /* Ensure that buffer size is a multiple of period size */
 288         ret = snd_pcm_hw_constraint_integer(runtime,
 289                                             SNDRV_PCM_HW_PARAM_PERIODS);
 290         if (ret < 0)
 291                 goto out;
 292
 293         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
 294         if (prtd == NULL) {
 295                 ret = -ENOMEM;
 296                 goto out;
 297         }
 298         spin_lock_init(&prtd->lock);
 299         runtime->private_data = prtd;
 300
 301 out:
 302         return ret;
 303 }
 304
 305 static int omap_pcm_close(struct snd_pcm_substream *substream)
 306 {
 307         struct snd_pcm_runtime *runtime = substream->runtime;
 308
 309         kfree(runtime->private_data);
 310         return 0;
 311 }
 312
 313 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 314         struct vm_area_struct *vma)
 315 {
 316         struct snd_pcm_runtime *runtime = substream->runtime;
 317
 318         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 319                                      runtime->dma_area,
 320                                      runtime->dma_addr,
 321                                      runtime->dma_bytes);
 322 }
 323
 324 static struct snd_pcm_ops omap_pcm_ops = {
 325         .open           = omap_pcm_open,
 326         .close          = omap_pcm_close,
 327         .ioctl          = snd_pcm_lib_ioctl,
 328         .hw_params      = omap_pcm_hw_params,
 329         .hw_free        = omap_pcm_hw_free,
 330         .prepare        = omap_pcm_prepare,
 331         .trigger        = omap_pcm_trigger,
 332         .pointer        = omap_pcm_pointer,
 333         .mmap           = omap_pcm_mmap,
 334 };
 335
 336 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
 337
 338 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 339         int stream)
 340 {
 341         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 342         struct snd_dma_buffer *buf = &substream->dma_buffer;
 343         size_t size = omap_pcm_hardware.buffer_bytes_max;
 344
 345         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 346         buf->dev.dev = pcm->card->dev;
 347         buf->private_data = NULL;
 348         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 349                                            &buf->addr, GFP_KERNEL);
 350         if (!buf->area)
 351                 return -ENOMEM;
 352
 353         buf->bytes = size;
 354         return 0;
 355 }
 356
 357 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
 358 {
 359         struct snd_pcm_substream *substream;
 360         struct snd_dma_buffer *buf;
 361         int stream;
 362
 363         for (stream = 0; stream < 2; stream++) {
 364                 substream = pcm->streams[stream].substream;
 365                 if (!substream)
 366                         continue;
 367
 368                 buf = &substream->dma_buffer;
 369                 if (!buf->area)
 370                         continue;
 371
 372                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 373                                       buf->area, buf->addr);
 374                 buf->area = NULL;
 375         }
 376 }
 377
 378 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
 379 {
 380         struct snd_card *card = rtd->card->snd_card;
 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 (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 390                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 391                         SNDRV_PCM_STREAM_PLAYBACK);
 392                 if (ret)
 393                         goto out;
 394         }
 395
 396         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 397                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 398                         SNDRV_PCM_STREAM_CAPTURE);
 399                 if (ret)
 400                         goto out;
 401         }
 402
 403 out:
 404         /* free preallocated buffers in case of error */
 405         if (ret)
 406                 omap_pcm_free_dma_buffers(pcm);
 407
 408         return ret;
 409 }
 410
 411 static struct snd_soc_platform_driver omap_soc_platform = {
 412         .ops            = &omap_pcm_ops,
 413         .pcm_new        = omap_pcm_new,
 414         .pcm_free       = omap_pcm_free_dma_buffers,
 415 };
 416
 417 static __devinit int omap_pcm_probe(struct platform_device *pdev)
 418 {
 419         return snd_soc_register_platform(&pdev->dev,
 420                         &omap_soc_platform);
 421 }
 422
 423 static int __devexit omap_pcm_remove(struct platform_device *pdev)
 424 {
 425         snd_soc_unregister_platform(&pdev->dev);
 426         return 0;
 427 }
 428
 429 static struct platform_driver omap_pcm_driver = {
 430         .driver = {
 431                         .name = "omap-pcm-audio",
 432                         .owner = THIS_MODULE,
 433         },
 434
 435         .probe = omap_pcm_probe,
 436         .remove = __devexit_p(omap_pcm_remove),
 437 };
 438
 439 module_platform_driver(omap_pcm_driver);
 440
 441 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
 442 MODULE_DESCRIPTION("OMAP PCM DMA module");
 443 MODULE_LICENSE("GPL");
 444 MODULE_ALIAS("platform:omap-pcm-audio");