kernel/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         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  86
  87         /* return if this is a bufferless transfer e.g.
  88          * codec <--> BT codec or GSM modem -- lg FIXME */
  89         if (!dma_data)
  90                 return 0;
  91
  92         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  93         runtime->dma_bytes = params_buffer_bytes(params);
  94
  95         chan = snd_dmaengine_pcm_get_chan(substream);
  96         if (!chan)
  97                 return -EINVAL;
  98
  99         /* fills in addr_width and direction */
 100         err = snd_hwparams_to_dma_slave_config(substream, params, &config);
 101         if (err)
 102                 return err;
 103
 104         snd_dmaengine_pcm_set_config_from_dai_data(substream,
 105                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
 106                         &config);
 107
 108         return dmaengine_slave_config(chan, &config);
 109 }
 110
 111 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 112 {
 113         snd_pcm_set_runtime_buffer(substream, NULL);
 114         return 0;
 115 }
 116
 117 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
 118 {
 119         snd_pcm_uframes_t offset;
 120
 121         if (pcm_omap1510())
 122                 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
 123         else
 124                 offset = snd_dmaengine_pcm_pointer(substream);
 125
 126         return offset;
 127 }
 128
 129 static int omap_pcm_open(struct snd_pcm_substream *substream)
 130 {
 131         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 132         struct snd_dmaengine_dai_dma_data *dma_data;
 133         int ret;
 134
 135         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 136
 137         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 138
 139         /* DT boot: filter_data is the DMA name */
 140         if (rtd->cpu_dai->dev->of_node) {
 141                 struct dma_chan *chan;
 142
 143                 chan = dma_request_slave_channel(rtd->cpu_dai->dev,
 144                                                  dma_data->filter_data);
 145                 ret = snd_dmaengine_pcm_open(substream, chan);
 146         } else {
 147                 ret = snd_dmaengine_pcm_open_request_chan(substream,
 148                                                           omap_dma_filter_fn,
 149                                                           dma_data->filter_data);
 150         }
 151         return ret;
 152 }
 153
 154 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 155         struct vm_area_struct *vma)
 156 {
 157         struct snd_pcm_runtime *runtime = substream->runtime;
 158
 159         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 160                                      runtime->dma_area,
 161                                      runtime->dma_addr,
 162                                      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_writecombine(pcm->card->dev, size,
 187                                            &buf->addr, GFP_KERNEL);
 188         if (!buf->area)
 189                 return -ENOMEM;
 190
 191         buf->bytes = size;
 192         return 0;
 193 }
 194
 195 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
 196 {
 197         struct snd_pcm_substream *substream;
 198         struct snd_dma_buffer *buf;
 199         int stream;
 200
 201         for (stream = 0; stream < 2; stream++) {
 202                 substream = pcm->streams[stream].substream;
 203                 if (!substream)
 204                         continue;
 205
 206                 buf = &substream->dma_buffer;
 207                 if (!buf->area)
 208                         continue;
 209
 210                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 211                                       buf->area, buf->addr);
 212                 buf->area = NULL;
 213         }
 214 }
 215
 216 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
 217 {
 218         struct snd_card *card = rtd->card->snd_card;
 219         struct snd_pcm *pcm = rtd->pcm;
 220         int ret;
 221
 222         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 223         if (ret)
 224                 return ret;
 225
 226         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 227                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 228                         SNDRV_PCM_STREAM_PLAYBACK);
 229                 if (ret)
 230                         goto out;
 231         }
 232
 233         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 234                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 235                         SNDRV_PCM_STREAM_CAPTURE);
 236                 if (ret)
 237                         goto out;
 238         }
 239
 240 out:
 241         /* free preallocated buffers in case of error */
 242         if (ret)
 243                 omap_pcm_free_dma_buffers(pcm);
 244
 245         return ret;
 246 }
 247
 248 static struct snd_soc_platform_driver omap_soc_platform = {
 249         .ops            = &omap_pcm_ops,
 250         .pcm_new        = omap_pcm_new,
 251         .pcm_free       = omap_pcm_free_dma_buffers,
 252 };
 253
 254 int omap_pcm_platform_register(struct device *dev)
 255 {
 256         omap_pcm_limit_supported_formats();
 257         return devm_snd_soc_register_platform(dev, &omap_soc_platform);
 258 }
 259 EXPORT_SYMBOL_GPL(omap_pcm_platform_register);
 260
 261 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
 262 MODULE_DESCRIPTION("OMAP PCM DMA module");
 263 MODULE_LICENSE("GPL");