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         int err = 0;
 105
 106         dma_data = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
 107
 108         /* return if this is a bufferless transfer e.g.
 109          * codec <--> BT codec or GSM modem -- lg FIXME */
 110         if (!dma_data)
 111                 return 0;
 112
 113         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 114         runtime->dma_bytes = params_buffer_bytes(params);
 115
 116         if (prtd->dma_data)
 117                 return 0;
 118         prtd->dma_data = dma_data;
 119         err = omap_request_dma(dma_data->dma_req, dma_data->name,
 120                                omap_pcm_dma_irq, substream, &prtd->dma_ch);
 121         if (!err) {
 122                 /*
 123                  * Link channel with itself so DMA doesn't need any
 124                  * reprogramming while looping the buffer
 125                  */
 126                 omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
 127         }
 128
 129         return err;
 130 }
 131
 132 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 133 {
 134         struct snd_pcm_runtime *runtime = substream->runtime;
 135         struct omap_runtime_data *prtd = runtime->private_data;
 136
 137         if (prtd->dma_data == NULL)
 138                 return 0;
 139
 140         omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
 141         omap_free_dma(prtd->dma_ch);
 142         prtd->dma_data = NULL;
 143
 144         snd_pcm_set_runtime_buffer(substream, NULL);
 145
 146         return 0;
 147 }
 148
 149 static int omap_pcm_prepare(struct snd_pcm_substream *substream)
 150 {
 151         struct snd_pcm_runtime *runtime = substream->runtime;
 152         struct omap_runtime_data *prtd = runtime->private_data;
 153         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
 154         struct omap_dma_channel_params dma_params;
 155         int bytes;
 156
 157         /* return if this is a bufferless transfer e.g.
 158          * codec <--> BT codec or GSM modem -- lg FIXME */
 159         if (!prtd->dma_data)
 160                 return 0;
 161
 162         memset(&dma_params, 0, sizeof(dma_params));
 163         dma_params.data_type                    = dma_data->data_type;
 164         dma_params.trigger                      = dma_data->dma_req;
 165         dma_params.sync_mode                    = dma_data->sync_mode;
 166         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 167                 dma_params.src_amode            = OMAP_DMA_AMODE_POST_INC;
 168                 dma_params.dst_amode            = OMAP_DMA_AMODE_CONSTANT;
 169                 dma_params.src_or_dst_synch     = OMAP_DMA_DST_SYNC;
 170                 dma_params.src_start            = runtime->dma_addr;
 171                 dma_params.dst_start            = dma_data->port_addr;
 172                 dma_params.dst_port             = OMAP_DMA_PORT_MPUI;
 173                 dma_params.dst_fi               = dma_data->packet_size;
 174         } else {
 175                 dma_params.src_amode            = OMAP_DMA_AMODE_CONSTANT;
 176                 dma_params.dst_amode            = OMAP_DMA_AMODE_POST_INC;
 177                 dma_params.src_or_dst_synch     = OMAP_DMA_SRC_SYNC;
 178                 dma_params.src_start            = dma_data->port_addr;
 179                 dma_params.dst_start            = runtime->dma_addr;
 180                 dma_params.src_port             = OMAP_DMA_PORT_MPUI;
 181                 dma_params.src_fi               = dma_data->packet_size;
 182         }
 183         /*
 184          * Set DMA transfer frame size equal to ALSA period size and frame
 185          * count as no. of ALSA periods. Then with DMA frame interrupt enabled,
 186          * we can transfer the whole ALSA buffer with single DMA transfer but
 187          * still can get an interrupt at each period bounary
 188          */
 189         bytes = snd_pcm_lib_period_bytes(substream);
 190         dma_params.elem_count   = bytes >> dma_data->data_type;
 191         dma_params.frame_count  = runtime->periods;
 192         omap_set_dma_params(prtd->dma_ch, &dma_params);
 193
 194         if ((cpu_is_omap1510()))
 195                 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ |
 196                               OMAP_DMA_LAST_IRQ | OMAP_DMA_BLOCK_IRQ);
 197         else
 198                 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
 199
 200         if (!(cpu_class_is_omap1())) {
 201                 omap_set_dma_src_burst_mode(prtd->dma_ch,
 202                                                 OMAP_DMA_DATA_BURST_16);
 203                 omap_set_dma_dest_burst_mode(prtd->dma_ch,
 204                                                 OMAP_DMA_DATA_BURST_16);
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 211 {
 212         struct snd_pcm_runtime *runtime = substream->runtime;
 213         struct omap_runtime_data *prtd = runtime->private_data;
 214         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
 215         unsigned long flags;
 216         int ret = 0;
 217
 218         spin_lock_irqsave(&prtd->lock, flags);
 219         switch (cmd) {
 220         case SNDRV_PCM_TRIGGER_START:
 221         case SNDRV_PCM_TRIGGER_RESUME:
 222         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 223                 prtd->period_index = 0;
 224                 /* Configure McBSP internal buffer usage */
 225                 if (dma_data->set_threshold)
 226                         dma_data->set_threshold(substream);
 227
 228                 omap_start_dma(prtd->dma_ch);
 229                 break;
 230
 231         case SNDRV_PCM_TRIGGER_STOP:
 232         case SNDRV_PCM_TRIGGER_SUSPEND:
 233         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 234                 prtd->period_index = -1;
 235                 omap_stop_dma(prtd->dma_ch);
 236                 break;
 237         default:
 238                 ret = -EINVAL;
 239         }
 240         spin_unlock_irqrestore(&prtd->lock, flags);
 241
 242         return ret;
 243 }
 244
 245 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
 246 {
 247         struct snd_pcm_runtime *runtime = substream->runtime;
 248         struct omap_runtime_data *prtd = runtime->private_data;
 249         dma_addr_t ptr;
 250         snd_pcm_uframes_t offset;
 251
 252         if (cpu_is_omap1510()) {
 253                 offset = prtd->period_index * runtime->period_size;
 254         } else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 255                 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
 256                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 257         } else {
 258                 ptr = omap_get_dma_src_pos(prtd->dma_ch);
 259                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 260         }
 261
 262         if (offset >= runtime->buffer_size)
 263                 offset = 0;
 264
 265         return offset;
 266 }
 267
 268 static int omap_pcm_open(struct snd_pcm_substream *substream)
 269 {
 270         struct snd_pcm_runtime *runtime = substream->runtime;
 271         struct omap_runtime_data *prtd;
 272         int ret;
 273
 274         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 275
 276         /* Ensure that buffer size is a multiple of period size */
 277         ret = snd_pcm_hw_constraint_integer(runtime,
 278                                             SNDRV_PCM_HW_PARAM_PERIODS);
 279         if (ret < 0)
 280                 goto out;
 281
 282         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
 283         if (prtd == NULL) {
 284                 ret = -ENOMEM;
 285                 goto out;
 286         }
 287         spin_lock_init(&prtd->lock);
 288         runtime->private_data = prtd;
 289
 290 out:
 291         return ret;
 292 }
 293
 294 static int omap_pcm_close(struct snd_pcm_substream *substream)
 295 {
 296         struct snd_pcm_runtime *runtime = substream->runtime;
 297
 298         kfree(runtime->private_data);
 299         return 0;
 300 }
 301
 302 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 303         struct vm_area_struct *vma)
 304 {
 305         struct snd_pcm_runtime *runtime = substream->runtime;
 306
 307         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 308                                      runtime->dma_area,
 309                                      runtime->dma_addr,
 310                                      runtime->dma_bytes);
 311 }
 312
 313 static struct snd_pcm_ops omap_pcm_ops = {
 314         .open           = omap_pcm_open,
 315         .close          = omap_pcm_close,
 316         .ioctl          = snd_pcm_lib_ioctl,
 317         .hw_params      = omap_pcm_hw_params,
 318         .hw_free        = omap_pcm_hw_free,
 319         .prepare        = omap_pcm_prepare,
 320         .trigger        = omap_pcm_trigger,
 321         .pointer        = omap_pcm_pointer,
 322         .mmap           = omap_pcm_mmap,
 323 };
 324
 325 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
 326
 327 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 328         int stream)
 329 {
 330         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 331         struct snd_dma_buffer *buf = &substream->dma_buffer;
 332         size_t size = omap_pcm_hardware.buffer_bytes_max;
 333
 334         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 335         buf->dev.dev = pcm->card->dev;
 336         buf->private_data = NULL;
 337         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 338                                            &buf->addr, GFP_KERNEL);
 339         if (!buf->area)
 340                 return -ENOMEM;
 341
 342         buf->bytes = size;
 343         return 0;
 344 }
 345
 346 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
 347 {
 348         struct snd_pcm_substream *substream;
 349         struct snd_dma_buffer *buf;
 350         int stream;
 351
 352         for (stream = 0; stream < 2; stream++) {
 353                 substream = pcm->streams[stream].substream;
 354                 if (!substream)
 355                         continue;
 356
 357                 buf = &substream->dma_buffer;
 358                 if (!buf->area)
 359                         continue;
 360
 361                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 362                                       buf->area, buf->addr);
 363                 buf->area = NULL;
 364         }
 365 }
 366
 367 static int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
 368                  struct snd_pcm *pcm)
 369 {
 370         int ret = 0;
 371
 372         if (!card->dev->dma_mask)
 373                 card->dev->dma_mask = &omap_pcm_dmamask;
 374         if (!card->dev->coherent_dma_mask)
 375                 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
 376
 377         if (dai->playback.channels_min) {
 378                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 379                         SNDRV_PCM_STREAM_PLAYBACK);
 380                 if (ret)
 381                         goto out;
 382         }
 383
 384         if (dai->capture.channels_min) {
 385                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 386                         SNDRV_PCM_STREAM_CAPTURE);
 387                 if (ret)
 388                         goto out;
 389         }
 390
 391 out:
 392         return ret;
 393 }
 394
 395 struct snd_soc_platform omap_soc_platform = {
 396         .name           = "omap-pcm-audio",
 397         .pcm_ops        = &omap_pcm_ops,
 398         .pcm_new        = omap_pcm_new,
 399         .pcm_free       = omap_pcm_free_dma_buffers,
 400 };
 401 EXPORT_SYMBOL_GPL(omap_soc_platform);
 402
 403 static int __init omap_soc_platform_init(void)
 404 {
 405         return snd_soc_register_platform(&omap_soc_platform);
 406 }
 407 module_init(omap_soc_platform_init);
 408
 409 static void __exit omap_soc_platform_exit(void)
 410 {
 411         snd_soc_unregister_platform(&omap_soc_platform);
 412 }
 413 module_exit(omap_soc_platform_exit);
 414
 415 MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
 416 MODULE_DESCRIPTION("OMAP PCM DMA module");
 417 MODULE_LICENSE("GPL");