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 "omap-pcm.h"
  36
  37 #ifdef CONFIG_ARCH_OMAP1
  38 #define pcm_omap1510()  cpu_is_omap1510()
  39 #else
  40 #define pcm_omap1510()  0
  41 #endif
  42
  43 static const struct snd_pcm_hardware omap_pcm_hardware = {
  44         .info                   = SNDRV_PCM_INFO_MMAP |
  45                                   SNDRV_PCM_INFO_MMAP_VALID |
  46                                   SNDRV_PCM_INFO_INTERLEAVED |
  47                                   SNDRV_PCM_INFO_PAUSE |
  48                                   SNDRV_PCM_INFO_RESUME |
  49                                   SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
  50         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  51                                   SNDRV_PCM_FMTBIT_S32_LE,
  52         .period_bytes_min       = 32,
  53         .period_bytes_max       = 64 * 1024,
  54         .periods_min            = 2,
  55         .periods_max            = 255,
  56         .buffer_bytes_max       = 128 * 1024,
  57 };
  58
  59 static int omap_pcm_get_dma_buswidth(int num_bits)
  60 {
  61         int buswidth;
  62
  63         switch (num_bits) {
  64         case 16:
  65                 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
  66                 break;
  67         case 32:
  68                 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
  69                 break;
  70         default:
  71                 buswidth = -EINVAL;
  72                 break;
  73         }
  74         return buswidth;
  75 }
  76
  77
  78 /* this may get called several times by oss emulation */
  79 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
  80                               struct snd_pcm_hw_params *params)
  81 {
  82         struct snd_pcm_runtime *runtime = substream->runtime;
  83         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  84         struct omap_pcm_dma_data *dma_data;
  85         struct dma_slave_config config;
  86         struct dma_chan *chan;
  87         int err = 0;
  88
  89         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  90
  91         /* return if this is a bufferless transfer e.g.
  92          * codec <--> BT codec or GSM modem -- lg FIXME */
  93         if (!dma_data)
  94                 return 0;
  95
  96         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  97         runtime->dma_bytes = params_buffer_bytes(params);
  98
  99         chan = snd_dmaengine_pcm_get_chan(substream);
 100         if (!chan)
 101                 return -EINVAL;
 102
 103         /* fills in addr_width and direction */
 104         err = snd_hwparams_to_dma_slave_config(substream, params, &config);
 105         if (err)
 106                 return err;
 107
 108         /* Override the *_dma addr_width if requested by the DAI driver */
 109         if (dma_data->data_type) {
 110                 int buswidth = omap_pcm_get_dma_buswidth(dma_data->data_type);
 111
 112                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 113                         config.dst_addr_width = buswidth;
 114                 else
 115                         config.src_addr_width = buswidth;
 116         }
 117
 118         config.src_addr = dma_data->port_addr;
 119         config.dst_addr = dma_data->port_addr;
 120         config.src_maxburst = dma_data->packet_size;
 121         config.dst_maxburst = dma_data->packet_size;
 122
 123         return dmaengine_slave_config(chan, &config);
 124 }
 125
 126 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 127 {
 128         snd_pcm_set_runtime_buffer(substream, NULL);
 129         return 0;
 130 }
 131
 132 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 133 {
 134         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 135         struct omap_pcm_dma_data *dma_data;
 136         int ret = 0;
 137
 138         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 139
 140         switch (cmd) {
 141         case SNDRV_PCM_TRIGGER_START:
 142         case SNDRV_PCM_TRIGGER_RESUME:
 143         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 144                 /* Configure McBSP internal buffer usage */
 145                 if (dma_data->set_threshold)
 146                         dma_data->set_threshold(substream);
 147                 break;
 148
 149         case SNDRV_PCM_TRIGGER_STOP:
 150         case SNDRV_PCM_TRIGGER_SUSPEND:
 151         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 152                 break;
 153         default:
 154                 ret = -EINVAL;
 155         }
 156
 157         if (ret == 0)
 158                 ret = snd_dmaengine_pcm_trigger(substream, cmd);
 159
 160         return ret;
 161 }
 162
 163 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
 164 {
 165         snd_pcm_uframes_t offset;
 166
 167         if (pcm_omap1510())
 168                 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
 169         else
 170                 offset = snd_dmaengine_pcm_pointer(substream);
 171
 172         return offset;
 173 }
 174
 175 static int omap_pcm_open(struct snd_pcm_substream *substream)
 176 {
 177         struct snd_pcm_runtime *runtime = substream->runtime;
 178         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 179         struct omap_pcm_dma_data *dma_data;
 180         int ret;
 181
 182         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 183
 184         /* Ensure that buffer size is a multiple of period size */
 185         ret = snd_pcm_hw_constraint_integer(runtime,
 186                                             SNDRV_PCM_HW_PARAM_PERIODS);
 187         if (ret < 0)
 188                 return ret;
 189
 190         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 191         ret = snd_dmaengine_pcm_open(substream, omap_dma_filter_fn,
 192                                      &dma_data->dma_req);
 193         return ret;
 194 }
 195
 196 static int omap_pcm_close(struct snd_pcm_substream *substream)
 197 {
 198         snd_dmaengine_pcm_close(substream);
 199         return 0;
 200 }
 201
 202 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 203         struct vm_area_struct *vma)
 204 {
 205         struct snd_pcm_runtime *runtime = substream->runtime;
 206
 207         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 208                                      runtime->dma_area,
 209                                      runtime->dma_addr,
 210                                      runtime->dma_bytes);
 211 }
 212
 213 static struct snd_pcm_ops omap_pcm_ops = {
 214         .open           = omap_pcm_open,
 215         .close          = omap_pcm_close,
 216         .ioctl          = snd_pcm_lib_ioctl,
 217         .hw_params      = omap_pcm_hw_params,
 218         .hw_free        = omap_pcm_hw_free,
 219         .trigger        = omap_pcm_trigger,
 220         .pointer        = omap_pcm_pointer,
 221         .mmap           = omap_pcm_mmap,
 222 };
 223
 224 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
 225
 226 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 227         int stream)
 228 {
 229         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 230         struct snd_dma_buffer *buf = &substream->dma_buffer;
 231         size_t size = omap_pcm_hardware.buffer_bytes_max;
 232
 233         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 234         buf->dev.dev = pcm->card->dev;
 235         buf->private_data = NULL;
 236         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 237                                            &buf->addr, GFP_KERNEL);
 238         if (!buf->area)
 239                 return -ENOMEM;
 240
 241         buf->bytes = size;
 242         return 0;
 243 }
 244
 245 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
 246 {
 247         struct snd_pcm_substream *substream;
 248         struct snd_dma_buffer *buf;
 249         int stream;
 250
 251         for (stream = 0; stream < 2; stream++) {
 252                 substream = pcm->streams[stream].substream;
 253                 if (!substream)
 254                         continue;
 255
 256                 buf = &substream->dma_buffer;
 257                 if (!buf->area)
 258                         continue;
 259
 260                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 261                                       buf->area, buf->addr);
 262                 buf->area = NULL;
 263         }
 264 }
 265
 266 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
 267 {
 268         struct snd_card *card = rtd->card->snd_card;
 269         struct snd_pcm *pcm = rtd->pcm;
 270         int ret = 0;
 271
 272         if (!card->dev->dma_mask)
 273                 card->dev->dma_mask = &omap_pcm_dmamask;
 274         if (!card->dev->coherent_dma_mask)
 275                 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
 276
 277         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 278                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 279                         SNDRV_PCM_STREAM_PLAYBACK);
 280                 if (ret)
 281                         goto out;
 282         }
 283
 284         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 285                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 286                         SNDRV_PCM_STREAM_CAPTURE);
 287                 if (ret)
 288                         goto out;
 289         }
 290
 291 out:
 292         /* free preallocated buffers in case of error */
 293         if (ret)
 294                 omap_pcm_free_dma_buffers(pcm);
 295
 296         return ret;
 297 }
 298
 299 static struct snd_soc_platform_driver omap_soc_platform = {
 300         .ops            = &omap_pcm_ops,
 301         .pcm_new        = omap_pcm_new,
 302         .pcm_free       = omap_pcm_free_dma_buffers,
 303 };
 304
 305 static int omap_pcm_probe(struct platform_device *pdev)
 306 {
 307         return snd_soc_register_platform(&pdev->dev,
 308                         &omap_soc_platform);
 309 }
 310
 311 static int omap_pcm_remove(struct platform_device *pdev)
 312 {
 313         snd_soc_unregister_platform(&pdev->dev);
 314         return 0;
 315 }
 316
 317 static struct platform_driver omap_pcm_driver = {
 318         .driver = {
 319                         .name = "omap-pcm-audio",
 320                         .owner = THIS_MODULE,
 321         },
 322
 323         .probe = omap_pcm_probe,
 324         .remove = omap_pcm_remove,
 325 };
 326
 327 module_platform_driver(omap_pcm_driver);
 328
 329 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
 330 MODULE_DESCRIPTION("OMAP PCM DMA module");
 331 MODULE_LICENSE("GPL");
 332 MODULE_ALIAS("platform:omap-pcm-audio");