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 #include <sound/omap-pcm.h>
  35
  36 #ifdef CONFIG_ARCH_OMAP1
  37 #define pcm_omap1510()  cpu_is_omap1510()
  38 #else
  39 #define pcm_omap1510()  0
  40 #endif
  41
  42 static struct snd_pcm_hardware omap_pcm_hardware = {
  43         .info                   = SNDRV_PCM_INFO_MMAP |
  44                                   SNDRV_PCM_INFO_MMAP_VALID |
  45                                   SNDRV_PCM_INFO_INTERLEAVED |
  46                                   SNDRV_PCM_INFO_PAUSE |
  47                                   SNDRV_PCM_INFO_RESUME |
  48                                   SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
  49         .period_bytes_min       = 32,
  50         .period_bytes_max       = 64 * 1024,
  51         .periods_min            = 2,
  52         .periods_max            = 255,
  53         .buffer_bytes_max       = 128 * 1024,
  54 };
  55
  56 /* sDMA supports only 1, 2, and 4 byte transfer elements. */
  57 static void omap_pcm_limit_supported_formats(void)
  58 {
  59         int i;
  60
  61         for (i = 0; i <= SNDRV_PCM_FORMAT_LAST; i++) {
  62                 switch (snd_pcm_format_physical_width(i)) {
  63                 case 8:
  64                 case 16:
  65                 case 32:
  66                         omap_pcm_hardware.formats |= (1LL << i);
  67                         break;
  68                 default:
  69                         break;
  70                 }
  71         }
  72 }
  73
  74 /* this may get called several times by oss emulation */
  75 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
  76                               struct snd_pcm_hw_params *params)
  77 {
  78         struct snd_pcm_runtime *runtime = substream->runtime;
  79         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  80         struct omap_pcm_dma_data *dma_data;
  81         struct dma_slave_config config;
  82         struct dma_chan *chan;
  83         int err = 0;
  84
  85         memset(&config, 0x00, sizeof(config));
  86
  87         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  88
  89         /* return if this is a bufferless transfer e.g.
  90          * codec <--> BT codec or GSM modem -- lg FIXME */
  91         if (!dma_data)
  92                 return 0;
  93
  94         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  95         runtime->dma_bytes = params_buffer_bytes(params);
  96
  97         chan = snd_dmaengine_pcm_get_chan(substream);
  98         if (!chan)
  99                 return -EINVAL;
 100
 101         /* fills in addr_width and direction */
 102         err = snd_hwparams_to_dma_slave_config(substream, params, &config);
 103         if (err)
 104                 return err;
 105
 106         snd_dmaengine_pcm_set_config_from_dai_data(substream,
 107                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
 108                         &config);
 109
 110         return dmaengine_slave_config(chan, &config);
 111 }
 112
 113 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 114 {
 115         snd_pcm_set_runtime_buffer(substream, NULL);
 116         return 0;
 117 }
 118
 119 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
 120 {
 121         snd_pcm_uframes_t offset;
 122
 123         if (pcm_omap1510())
 124                 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
 125         else
 126                 offset = snd_dmaengine_pcm_pointer(substream);
 127
 128         return offset;
 129 }
 130
 131 static int omap_pcm_open(struct snd_pcm_substream *substream)
 132 {
 133         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 134         struct snd_dmaengine_dai_dma_data *dma_data;
 135         int ret;
 136
 137         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 138
 139         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 140
 141         /* DT boot: filter_data is the DMA name */
 142         if (rtd->cpu_dai->dev->of_node) {
 143                 struct dma_chan *chan;
 144
 145                 chan = dma_request_slave_channel(rtd->cpu_dai->dev,
 146                                                  dma_data->filter_data);
 147                 ret = snd_dmaengine_pcm_open(substream, chan);
 148         } else {
 149                 ret = snd_dmaengine_pcm_open_request_chan(substream,
 150                                                           omap_dma_filter_fn,
 151                                                           dma_data->filter_data);
 152         }
 153         return ret;
 154 }
 155
 156 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 157         struct vm_area_struct *vma)
 158 {
 159         struct snd_pcm_runtime *runtime = substream->runtime;
 160
 161         return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
 162                            runtime->dma_addr, runtime->dma_bytes);
 163 }
 164
 165 static struct snd_pcm_ops omap_pcm_ops = {
 166         .open           = omap_pcm_open,
 167         .close          = snd_dmaengine_pcm_close_release_chan,
 168         .ioctl          = snd_pcm_lib_ioctl,
 169         .hw_params      = omap_pcm_hw_params,
 170         .hw_free        = omap_pcm_hw_free,
 171         .trigger        = snd_dmaengine_pcm_trigger,
 172         .pointer        = omap_pcm_pointer,
 173         .mmap           = omap_pcm_mmap,
 174 };
 175
 176 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 177         int stream)
 178 {
 179         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 180         struct snd_dma_buffer *buf = &substream->dma_buffer;
 181         size_t size = omap_pcm_hardware.buffer_bytes_max;
 182
 183         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 184         buf->dev.dev = pcm->card->dev;
 185         buf->private_data = NULL;
 186         buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
 187         if (!buf->area)
 188                 return -ENOMEM;
 189
 190         buf->bytes = size;
 191         return 0;
 192 }
 193
 194 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
 195 {
 196         struct snd_pcm_substream *substream;
 197         struct snd_dma_buffer *buf;
 198         int stream;
 199
 200         for (stream = 0; stream < 2; stream++) {
 201                 substream = pcm->streams[stream].substream;
 202                 if (!substream)
 203                         continue;
 204
 205                 buf = &substream->dma_buffer;
 206                 if (!buf->area)
 207                         continue;
 208
 209                 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
 210                 buf->area = NULL;
 211         }
 212 }
 213
 214 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
 215 {
 216         struct snd_card *card = rtd->card->snd_card;
 217         struct snd_pcm *pcm = rtd->pcm;
 218         int ret;
 219
 220         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 221         if (ret)
 222                 return ret;
 223
 224         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 225                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 226                         SNDRV_PCM_STREAM_PLAYBACK);
 227                 if (ret)
 228                         goto out;
 229         }
 230
 231         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 232                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 233                         SNDRV_PCM_STREAM_CAPTURE);
 234                 if (ret)
 235                         goto out;
 236         }
 237
 238 out:
 239         /* free preallocated buffers in case of error */
 240         if (ret)
 241                 omap_pcm_free_dma_buffers(pcm);
 242
 243         return ret;
 244 }
 245
 246 static struct snd_soc_platform_driver omap_soc_platform = {
 247         .ops            = &omap_pcm_ops,
 248         .pcm_new        = omap_pcm_new,
 249         .pcm_free       = omap_pcm_free_dma_buffers,
 250 };
 251
 252 int omap_pcm_platform_register(struct device *dev)
 253 {
 254         omap_pcm_limit_supported_formats();
 255         return devm_snd_soc_register_platform(dev, &omap_soc_platform);
 256 }
 257 EXPORT_SYMBOL_GPL(omap_pcm_platform_register);
 258
 259 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
 260 MODULE_DESCRIPTION("OMAP PCM DMA module");
 261 MODULE_LICENSE("GPL");