git.oblomov.eu Git - linux-2.6/blob - 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 <sound/core.h>
  27 #include <sound/pcm.h>
  28 #include <sound/pcm_params.h>
  29 #include <sound/soc.h>
  30
  31 #include <mach/dma.h>
  32 #include "omap-pcm.h"
  33
  34 static const struct snd_pcm_hardware omap_pcm_hardware = {
  35         .info                   = SNDRV_PCM_INFO_MMAP |
  36                                   SNDRV_PCM_INFO_MMAP_VALID |
  37                                   SNDRV_PCM_INFO_INTERLEAVED |
  38                                   SNDRV_PCM_INFO_PAUSE |
  39                                   SNDRV_PCM_INFO_RESUME,
  40         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
  41         .period_bytes_min       = 32,
  42         .period_bytes_max       = 64 * 1024,
  43         .periods_min            = 2,
  44         .periods_max            = 255,
  45         .buffer_bytes_max       = 128 * 1024,
  46 };
  47
  48 struct omap_runtime_data {
  49         spinlock_t                      lock;
  50         struct omap_pcm_dma_data        *dma_data;
  51         int                             dma_ch;
  52         int                             period_index;
  53 };
  54
  55 static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
  56 {
  57         struct snd_pcm_substream *substream = data;
  58         struct snd_pcm_runtime *runtime = substream->runtime;
  59         struct omap_runtime_data *prtd = runtime->private_data;
  60         unsigned long flags;
  61
  62         if (cpu_is_omap1510()) {
  63                 /*
  64                  * OMAP1510 doesn't support DMA chaining so have to restart
  65                  * the transfer after all periods are transferred
  66                  */
  67                 spin_lock_irqsave(&prtd->lock, flags);
  68                 if (prtd->period_index >= 0) {
  69                         if (++prtd->period_index == runtime->periods) {
  70                                 prtd->period_index = 0;
  71                                 omap_start_dma(prtd->dma_ch);
  72                         }
  73                 }
  74                 spin_unlock_irqrestore(&prtd->lock, flags);
  75         }
  76
  77         snd_pcm_period_elapsed(substream);
  78 }
  79
  80 /* this may get called several times by oss emulation */
  81 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
  82                               struct snd_pcm_hw_params *params)
  83 {
  84         struct snd_pcm_runtime *runtime = substream->runtime;
  85         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  86         struct omap_runtime_data *prtd = runtime->private_data;
  87         struct omap_pcm_dma_data *dma_data = rtd->dai->cpu_dai->dma_data;
  88         int err = 0;
  89
  90         if (!dma_data)
  91                 return -ENODEV;
  92
  93         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  94         runtime->dma_bytes = params_buffer_bytes(params);
  95
  96         if (prtd->dma_data)
  97                 return 0;
  98         prtd->dma_data = dma_data;
  99         err = omap_request_dma(dma_data->dma_req, dma_data->name,
 100                                omap_pcm_dma_irq, substream, &prtd->dma_ch);
 101         if (!err && !cpu_is_omap1510()) {
 102                 /*
 103                  * Link channel with itself so DMA doesn't need any
 104                  * reprogramming while looping the buffer
 105                  */
 106                 omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
 107         }
 108
 109         return err;
 110 }
 111
 112 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 113 {
 114         struct snd_pcm_runtime *runtime = substream->runtime;
 115         struct omap_runtime_data *prtd = runtime->private_data;
 116
 117         if (prtd->dma_data == NULL)
 118                 return 0;
 119
 120         if (!cpu_is_omap1510())
 121                 omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
 122         omap_free_dma(prtd->dma_ch);
 123         prtd->dma_data = NULL;
 124
 125         snd_pcm_set_runtime_buffer(substream, NULL);
 126
 127         return 0;
 128 }
 129
 130 static int omap_pcm_prepare(struct snd_pcm_substream *substream)
 131 {
 132         struct snd_pcm_runtime *runtime = substream->runtime;
 133         struct omap_runtime_data *prtd = runtime->private_data;
 134         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
 135         struct omap_dma_channel_params dma_params;
 136
 137         memset(&dma_params, 0, sizeof(dma_params));
 138         /*
 139          * Note: Regardless of interface data formats supported by OMAP McBSP
 140          * or EAC blocks, internal representation is always fixed 16-bit/sample
 141          */
 142         dma_params.data_type                    = OMAP_DMA_DATA_TYPE_S16;
 143         dma_params.trigger                      = dma_data->dma_req;
 144         dma_params.sync_mode                    = OMAP_DMA_SYNC_ELEMENT;
 145         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 146                 dma_params.src_amode            = OMAP_DMA_AMODE_POST_INC;
 147                 dma_params.dst_amode            = OMAP_DMA_AMODE_CONSTANT;
 148                 dma_params.src_or_dst_synch     = OMAP_DMA_DST_SYNC;
 149                 dma_params.src_start            = runtime->dma_addr;
 150                 dma_params.dst_start            = dma_data->port_addr;
 151                 dma_params.dst_port             = OMAP_DMA_PORT_MPUI;
 152         } else {
 153                 dma_params.src_amode            = OMAP_DMA_AMODE_CONSTANT;
 154                 dma_params.dst_amode            = OMAP_DMA_AMODE_POST_INC;
 155                 dma_params.src_or_dst_synch     = OMAP_DMA_SRC_SYNC;
 156                 dma_params.src_start            = dma_data->port_addr;
 157                 dma_params.dst_start            = runtime->dma_addr;
 158                 dma_params.src_port             = OMAP_DMA_PORT_MPUI;
 159         }
 160         /*
 161          * Set DMA transfer frame size equal to ALSA period size and frame
 162          * count as no. of ALSA periods. Then with DMA frame interrupt enabled,
 163          * we can transfer the whole ALSA buffer with single DMA transfer but
 164          * still can get an interrupt at each period bounary
 165          */
 166         dma_params.elem_count   = snd_pcm_lib_period_bytes(substream) / 2;
 167         dma_params.frame_count  = runtime->periods;
 168         omap_set_dma_params(prtd->dma_ch, &dma_params);
 169
 170         omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
 171
 172         return 0;
 173 }
 174
 175 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 176 {
 177         struct snd_pcm_runtime *runtime = substream->runtime;
 178         struct omap_runtime_data *prtd = runtime->private_data;
 179         unsigned long flags;
 180         int ret = 0;
 181
 182         spin_lock_irqsave(&prtd->lock, flags);
 183         switch (cmd) {
 184         case SNDRV_PCM_TRIGGER_START:
 185         case SNDRV_PCM_TRIGGER_RESUME:
 186         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 187                 prtd->period_index = 0;
 188                 omap_start_dma(prtd->dma_ch);
 189                 break;
 190
 191         case SNDRV_PCM_TRIGGER_STOP:
 192         case SNDRV_PCM_TRIGGER_SUSPEND:
 193         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 194                 prtd->period_index = -1;
 195                 omap_stop_dma(prtd->dma_ch);
 196                 break;
 197         default:
 198                 ret = -EINVAL;
 199         }
 200         spin_unlock_irqrestore(&prtd->lock, flags);
 201
 202         return ret;
 203 }
 204
 205 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
 206 {
 207         struct snd_pcm_runtime *runtime = substream->runtime;
 208         struct omap_runtime_data *prtd = runtime->private_data;
 209         dma_addr_t ptr;
 210         snd_pcm_uframes_t offset;
 211
 212         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 213                 ptr = omap_get_dma_src_pos(prtd->dma_ch);
 214         else
 215                 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
 216
 217         offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 218         if (offset >= runtime->buffer_size)
 219                 offset = 0;
 220
 221         return offset;
 222 }
 223
 224 static int omap_pcm_open(struct snd_pcm_substream *substream)
 225 {
 226         struct snd_pcm_runtime *runtime = substream->runtime;
 227         struct omap_runtime_data *prtd;
 228         int ret;
 229
 230         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 231
 232         /* Ensure that buffer size is a multiple of period size */
 233         ret = snd_pcm_hw_constraint_integer(runtime,
 234                                             SNDRV_PCM_HW_PARAM_PERIODS);
 235         if (ret < 0)
 236                 goto out;
 237
 238         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
 239         if (prtd == NULL) {
 240                 ret = -ENOMEM;
 241                 goto out;
 242         }
 243         spin_lock_init(&prtd->lock);
 244         runtime->private_data = prtd;
 245
 246 out:
 247         return ret;
 248 }
 249
 250 static int omap_pcm_close(struct snd_pcm_substream *substream)
 251 {
 252         struct snd_pcm_runtime *runtime = substream->runtime;
 253
 254         kfree(runtime->private_data);
 255         return 0;
 256 }
 257
 258 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 259         struct vm_area_struct *vma)
 260 {
 261         struct snd_pcm_runtime *runtime = substream->runtime;
 262
 263         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 264                                      runtime->dma_area,
 265                                      runtime->dma_addr,
 266                                      runtime->dma_bytes);
 267 }
 268
 269 static struct snd_pcm_ops omap_pcm_ops = {
 270         .open           = omap_pcm_open,
 271         .close          = omap_pcm_close,
 272         .ioctl          = snd_pcm_lib_ioctl,
 273         .hw_params      = omap_pcm_hw_params,
 274         .hw_free        = omap_pcm_hw_free,
 275         .prepare        = omap_pcm_prepare,
 276         .trigger        = omap_pcm_trigger,
 277         .pointer        = omap_pcm_pointer,
 278         .mmap           = omap_pcm_mmap,
 279 };
 280
 281 static u64 omap_pcm_dmamask = DMA_BIT_MASK(32);
 282
 283 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 284         int stream)
 285 {
 286         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 287         struct snd_dma_buffer *buf = &substream->dma_buffer;
 288         size_t size = omap_pcm_hardware.buffer_bytes_max;
 289
 290         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 291         buf->dev.dev = pcm->card->dev;
 292         buf->private_data = NULL;
 293         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 294                                            &buf->addr, GFP_KERNEL);
 295         if (!buf->area)
 296                 return -ENOMEM;
 297
 298         buf->bytes = size;
 299         return 0;
 300 }
 301
 302 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
 303 {
 304         struct snd_pcm_substream *substream;
 305         struct snd_dma_buffer *buf;
 306         int stream;
 307
 308         for (stream = 0; stream < 2; stream++) {
 309                 substream = pcm->streams[stream].substream;
 310                 if (!substream)
 311                         continue;
 312
 313                 buf = &substream->dma_buffer;
 314                 if (!buf->area)
 315                         continue;
 316
 317                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 318                                       buf->area, buf->addr);
 319                 buf->area = NULL;
 320         }
 321 }
 322
 323 int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
 324                  struct snd_pcm *pcm)
 325 {
 326         int ret = 0;
 327
 328         if (!card->dev->dma_mask)
 329                 card->dev->dma_mask = &omap_pcm_dmamask;
 330         if (!card->dev->coherent_dma_mask)
 331                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 332
 333         if (dai->playback.channels_min) {
 334                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 335                         SNDRV_PCM_STREAM_PLAYBACK);
 336                 if (ret)
 337                         goto out;
 338         }
 339
 340         if (dai->capture.channels_min) {
 341                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 342                         SNDRV_PCM_STREAM_CAPTURE);
 343                 if (ret)
 344                         goto out;
 345         }
 346
 347 out:
 348         return ret;
 349 }
 350
 351 struct snd_soc_platform omap_soc_platform = {
 352         .name           = "omap-pcm-audio",
 353         .pcm_ops        = &omap_pcm_ops,
 354         .pcm_new        = omap_pcm_new,
 355         .pcm_free       = omap_pcm_free_dma_buffers,
 356 };
 357 EXPORT_SYMBOL_GPL(omap_soc_platform);
 358
 359 static int __init omap_soc_platform_init(void)
 360 {
 361         return snd_soc_register_platform(&omap_soc_platform);
 362 }
 363 module_init(omap_soc_platform_init);
 364
 365 static void __exit omap_soc_platform_exit(void)
 366 {
 367         snd_soc_unregister_platform(&omap_soc_platform);
 368 }
 369 module_exit(omap_soc_platform_exit);
 370
 371 MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
 372 MODULE_DESCRIPTION("OMAP PCM DMA module");
 373 MODULE_LICENSE("GPL");