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_soc_pcm_runtime *rtd = substream->private_data;
 178         struct omap_pcm_dma_data *dma_data;
 179
 180         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 181
 182         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 183
 184         return snd_dmaengine_pcm_open(substream, omap_dma_filter_fn,
 185                                       &dma_data->dma_req);
 186 }
 187
 188 static int omap_pcm_close(struct snd_pcm_substream *substream)
 189 {
 190         snd_dmaengine_pcm_close(substream);
 191         return 0;
 192 }
 193
 194 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 195         struct vm_area_struct *vma)
 196 {
 197         struct snd_pcm_runtime *runtime = substream->runtime;
 198
 199         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 200                                      runtime->dma_area,
 201                                      runtime->dma_addr,
 202                                      runtime->dma_bytes);
 203 }
 204
 205 static struct snd_pcm_ops omap_pcm_ops = {
 206         .open           = omap_pcm_open,
 207         .close          = omap_pcm_close,
 208         .ioctl          = snd_pcm_lib_ioctl,
 209         .hw_params      = omap_pcm_hw_params,
 210         .hw_free        = omap_pcm_hw_free,
 211         .trigger        = omap_pcm_trigger,
 212         .pointer        = omap_pcm_pointer,
 213         .mmap           = omap_pcm_mmap,
 214 };
 215
 216 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
 217
 218 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 219         int stream)
 220 {
 221         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 222         struct snd_dma_buffer *buf = &substream->dma_buffer;
 223         size_t size = omap_pcm_hardware.buffer_bytes_max;
 224
 225         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 226         buf->dev.dev = pcm->card->dev;
 227         buf->private_data = NULL;
 228         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 229                                            &buf->addr, GFP_KERNEL);
 230         if (!buf->area)
 231                 return -ENOMEM;
 232
 233         buf->bytes = size;
 234         return 0;
 235 }
 236
 237 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
 238 {
 239         struct snd_pcm_substream *substream;
 240         struct snd_dma_buffer *buf;
 241         int stream;
 242
 243         for (stream = 0; stream < 2; stream++) {
 244                 substream = pcm->streams[stream].substream;
 245                 if (!substream)
 246                         continue;
 247
 248                 buf = &substream->dma_buffer;
 249                 if (!buf->area)
 250                         continue;
 251
 252                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 253                                       buf->area, buf->addr);
 254                 buf->area = NULL;
 255         }
 256 }
 257
 258 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
 259 {
 260         struct snd_card *card = rtd->card->snd_card;
 261         struct snd_pcm *pcm = rtd->pcm;
 262         int ret = 0;
 263
 264         if (!card->dev->dma_mask)
 265                 card->dev->dma_mask = &omap_pcm_dmamask;
 266         if (!card->dev->coherent_dma_mask)
 267                 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
 268
 269         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 270                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 271                         SNDRV_PCM_STREAM_PLAYBACK);
 272                 if (ret)
 273                         goto out;
 274         }
 275
 276         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 277                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 278                         SNDRV_PCM_STREAM_CAPTURE);
 279                 if (ret)
 280                         goto out;
 281         }
 282
 283 out:
 284         /* free preallocated buffers in case of error */
 285         if (ret)
 286                 omap_pcm_free_dma_buffers(pcm);
 287
 288         return ret;
 289 }
 290
 291 static struct snd_soc_platform_driver omap_soc_platform = {
 292         .ops            = &omap_pcm_ops,
 293         .pcm_new        = omap_pcm_new,
 294         .pcm_free       = omap_pcm_free_dma_buffers,
 295 };
 296
 297 static int omap_pcm_probe(struct platform_device *pdev)
 298 {
 299         return snd_soc_register_platform(&pdev->dev,
 300                         &omap_soc_platform);
 301 }
 302
 303 static int omap_pcm_remove(struct platform_device *pdev)
 304 {
 305         snd_soc_unregister_platform(&pdev->dev);
 306         return 0;
 307 }
 308
 309 static struct platform_driver omap_pcm_driver = {
 310         .driver = {
 311                         .name = "omap-pcm-audio",
 312                         .owner = THIS_MODULE,
 313         },
 314
 315         .probe = omap_pcm_probe,
 316         .remove = omap_pcm_remove,
 317 };
 318
 319 module_platform_driver(omap_pcm_driver);
 320
 321 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
 322 MODULE_DESCRIPTION("OMAP PCM DMA module");
 323 MODULE_LICENSE("GPL");
 324 MODULE_ALIAS("platform:omap-pcm-audio");