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 <linux/omap-dma.h>
  29 #include <sound/core.h>
  30 #include <sound/pcm.h>
  31 #include <sound/pcm_params.h>
  32 #include <sound/dmaengine_pcm.h>
  33 #include <sound/soc.h>
  34
  35 #include <plat/cpu.h>
  36 #include "omap-pcm.h"
  37
  38 static const struct snd_pcm_hardware omap_pcm_hardware = {
  39         .info                   = SNDRV_PCM_INFO_MMAP |
  40                                   SNDRV_PCM_INFO_MMAP_VALID |
  41                                   SNDRV_PCM_INFO_INTERLEAVED |
  42                                   SNDRV_PCM_INFO_PAUSE |
  43                                   SNDRV_PCM_INFO_RESUME |
  44                                   SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
  45         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  46                                   SNDRV_PCM_FMTBIT_S32_LE,
  47         .period_bytes_min       = 32,
  48         .period_bytes_max       = 64 * 1024,
  49         .periods_min            = 2,
  50         .periods_max            = 255,
  51         .buffer_bytes_max       = 128 * 1024,
  52 };
  53
  54 static int omap_pcm_get_dma_buswidth(int num_bits)
  55 {
  56         int buswidth;
  57
  58         switch (num_bits) {
  59         case 16:
  60                 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
  61                 break;
  62         case 32:
  63                 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
  64                 break;
  65         default:
  66                 buswidth = -EINVAL;
  67                 break;
  68         }
  69         return buswidth;
  70 }
  71
  72
  73 /* this may get called several times by oss emulation */
  74 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
  75                               struct snd_pcm_hw_params *params)
  76 {
  77         struct snd_pcm_runtime *runtime = substream->runtime;
  78         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  79         struct omap_pcm_dma_data *dma_data;
  80         struct dma_slave_config config;
  81         struct dma_chan *chan;
  82         int err = 0;
  83
  84         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  85
  86         /* return if this is a bufferless transfer e.g.
  87          * codec <--> BT codec or GSM modem -- lg FIXME */
  88         if (!dma_data)
  89                 return 0;
  90
  91         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  92         runtime->dma_bytes = params_buffer_bytes(params);
  93
  94         chan = snd_dmaengine_pcm_get_chan(substream);
  95         if (!chan)
  96                 return -EINVAL;
  97
  98         /* fills in addr_width and direction */
  99         err = snd_hwparams_to_dma_slave_config(substream, params, &config);
 100         if (err)
 101                 return err;
 102
 103         /* Override the *_dma addr_width if requested by the DAI driver */
 104         if (dma_data->data_type) {
 105                 int buswidth = omap_pcm_get_dma_buswidth(dma_data->data_type);
 106
 107                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 108                         config.dst_addr_width = buswidth;
 109                 else
 110                         config.src_addr_width = buswidth;
 111         }
 112
 113         config.src_addr = dma_data->port_addr;
 114         config.dst_addr = dma_data->port_addr;
 115         config.src_maxburst = dma_data->packet_size;
 116         config.dst_maxburst = dma_data->packet_size;
 117
 118         return dmaengine_slave_config(chan, &config);
 119 }
 120
 121 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 122 {
 123         snd_pcm_set_runtime_buffer(substream, NULL);
 124         return 0;
 125 }
 126
 127 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 128 {
 129         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 130         struct omap_pcm_dma_data *dma_data;
 131         int ret = 0;
 132
 133         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 134
 135         switch (cmd) {
 136         case SNDRV_PCM_TRIGGER_START:
 137         case SNDRV_PCM_TRIGGER_RESUME:
 138         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 139                 /* Configure McBSP internal buffer usage */
 140                 if (dma_data->set_threshold)
 141                         dma_data->set_threshold(substream);
 142                 break;
 143
 144         case SNDRV_PCM_TRIGGER_STOP:
 145         case SNDRV_PCM_TRIGGER_SUSPEND:
 146         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 147                 break;
 148         default:
 149                 ret = -EINVAL;
 150         }
 151
 152         if (ret == 0)
 153                 ret = snd_dmaengine_pcm_trigger(substream, cmd);
 154
 155         return ret;
 156 }
 157
 158 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
 159 {
 160         snd_pcm_uframes_t offset;
 161
 162         if (cpu_is_omap1510())
 163                 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
 164         else
 165                 offset = snd_dmaengine_pcm_pointer(substream);
 166
 167         return offset;
 168 }
 169
 170 static int omap_pcm_open(struct snd_pcm_substream *substream)
 171 {
 172         struct snd_pcm_runtime *runtime = substream->runtime;
 173         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 174         struct omap_pcm_dma_data *dma_data;
 175         int ret;
 176
 177         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 178
 179         /* Ensure that buffer size is a multiple of period size */
 180         ret = snd_pcm_hw_constraint_integer(runtime,
 181                                             SNDRV_PCM_HW_PARAM_PERIODS);
 182         if (ret < 0)
 183                 return ret;
 184
 185         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 186         ret = snd_dmaengine_pcm_open(substream, omap_dma_filter_fn,
 187                                      &dma_data->dma_req);
 188         return ret;
 189 }
 190
 191 static int omap_pcm_close(struct snd_pcm_substream *substream)
 192 {
 193         snd_dmaengine_pcm_close(substream);
 194         return 0;
 195 }
 196
 197 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 198         struct vm_area_struct *vma)
 199 {
 200         struct snd_pcm_runtime *runtime = substream->runtime;
 201
 202         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 203                                      runtime->dma_area,
 204                                      runtime->dma_addr,
 205                                      runtime->dma_bytes);
 206 }
 207
 208 static struct snd_pcm_ops omap_pcm_ops = {
 209         .open           = omap_pcm_open,
 210         .close          = omap_pcm_close,
 211         .ioctl          = snd_pcm_lib_ioctl,
 212         .hw_params      = omap_pcm_hw_params,
 213         .hw_free        = omap_pcm_hw_free,
 214         .trigger        = omap_pcm_trigger,
 215         .pointer        = omap_pcm_pointer,
 216         .mmap           = omap_pcm_mmap,
 217 };
 218
 219 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
 220
 221 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 222         int stream)
 223 {
 224         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 225         struct snd_dma_buffer *buf = &substream->dma_buffer;
 226         size_t size = omap_pcm_hardware.buffer_bytes_max;
 227
 228         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 229         buf->dev.dev = pcm->card->dev;
 230         buf->private_data = NULL;
 231         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 232                                            &buf->addr, GFP_KERNEL);
 233         if (!buf->area)
 234                 return -ENOMEM;
 235
 236         buf->bytes = size;
 237         return 0;
 238 }
 239
 240 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
 241 {
 242         struct snd_pcm_substream *substream;
 243         struct snd_dma_buffer *buf;
 244         int stream;
 245
 246         for (stream = 0; stream < 2; stream++) {
 247                 substream = pcm->streams[stream].substream;
 248                 if (!substream)
 249                         continue;
 250
 251                 buf = &substream->dma_buffer;
 252                 if (!buf->area)
 253                         continue;
 254
 255                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 256                                       buf->area, buf->addr);
 257                 buf->area = NULL;
 258         }
 259 }
 260
 261 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
 262 {
 263         struct snd_card *card = rtd->card->snd_card;
 264         struct snd_pcm *pcm = rtd->pcm;
 265         int ret = 0;
 266
 267         if (!card->dev->dma_mask)
 268                 card->dev->dma_mask = &omap_pcm_dmamask;
 269         if (!card->dev->coherent_dma_mask)
 270                 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
 271
 272         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 273                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 274                         SNDRV_PCM_STREAM_PLAYBACK);
 275                 if (ret)
 276                         goto out;
 277         }
 278
 279         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 280                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 281                         SNDRV_PCM_STREAM_CAPTURE);
 282                 if (ret)
 283                         goto out;
 284         }
 285
 286 out:
 287         /* free preallocated buffers in case of error */
 288         if (ret)
 289                 omap_pcm_free_dma_buffers(pcm);
 290
 291         return ret;
 292 }
 293
 294 static struct snd_soc_platform_driver omap_soc_platform = {
 295         .ops            = &omap_pcm_ops,
 296         .pcm_new        = omap_pcm_new,
 297         .pcm_free       = omap_pcm_free_dma_buffers,
 298 };
 299
 300 static __devinit int omap_pcm_probe(struct platform_device *pdev)
 301 {
 302         return snd_soc_register_platform(&pdev->dev,
 303                         &omap_soc_platform);
 304 }
 305
 306 static int __devexit omap_pcm_remove(struct platform_device *pdev)
 307 {
 308         snd_soc_unregister_platform(&pdev->dev);
 309         return 0;
 310 }
 311
 312 static struct platform_driver omap_pcm_driver = {
 313         .driver = {
 314                         .name = "omap-pcm-audio",
 315                         .owner = THIS_MODULE,
 316         },
 317
 318         .probe = omap_pcm_probe,
 319         .remove = __devexit_p(omap_pcm_remove),
 320 };
 321
 322 module_platform_driver(omap_pcm_driver);
 323
 324 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
 325 MODULE_DESCRIPTION("OMAP PCM DMA module");
 326 MODULE_LICENSE("GPL");
 327 MODULE_ALIAS("platform:omap-pcm-audio");