sound/soc/blackfin/bf5xx-tdm-pcm.c

   1 /*
   2  * File:         sound/soc/blackfin/bf5xx-tdm-pcm.c
   3  * Author:       Barry Song <Barry.Song@analog.com>
   4  *
   5  * Created:      Tue June 06 2009
   6  * Description:  DMA driver for tdm codec
   7  *
   8  * Modified:
   9  *               Copyright 2009 Analog Devices Inc.
  10  *
  11  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, see the file COPYING, or write
  25  * to the Free Software Foundation, Inc.,
  26  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/gfp.h>
  34
  35 #include <sound/core.h>
  36 #include <sound/pcm.h>
  37 #include <sound/pcm_params.h>
  38 #include <sound/soc.h>
  39
  40 #include <asm/dma.h>
  41
  42 #include "bf5xx-tdm-pcm.h"
  43 #include "bf5xx-tdm.h"
  44 #include "bf5xx-sport.h"
  45
  46 #define PCM_BUFFER_MAX  0x8000
  47 #define FRAGMENT_SIZE_MIN  (4*1024)
  48 #define FRAGMENTS_MIN  2
  49 #define FRAGMENTS_MAX  32
  50
  51 static void bf5xx_dma_irq(void *data)
  52 {
  53         struct snd_pcm_substream *pcm = data;
  54         snd_pcm_period_elapsed(pcm);
  55 }
  56
  57 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
  58         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  59                 SNDRV_PCM_INFO_RESUME),
  60         .formats =          SNDRV_PCM_FMTBIT_S32_LE,
  61         .rates =            SNDRV_PCM_RATE_48000,
  62         .channels_min =     2,
  63         .channels_max =     8,
  64         .buffer_bytes_max = PCM_BUFFER_MAX,
  65         .period_bytes_min = FRAGMENT_SIZE_MIN,
  66         .period_bytes_max = PCM_BUFFER_MAX/2,
  67         .periods_min =      FRAGMENTS_MIN,
  68         .periods_max =      FRAGMENTS_MAX,
  69 };
  70
  71 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
  72         struct snd_pcm_hw_params *params)
  73 {
  74         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
  75         snd_pcm_lib_malloc_pages(substream, size * 4);
  76
  77         return 0;
  78 }
  79
  80 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
  81 {
  82         snd_pcm_lib_free_pages(substream);
  83
  84         return 0;
  85 }
  86
  87 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
  88 {
  89         struct snd_pcm_runtime *runtime = substream->runtime;
  90         struct sport_device *sport = runtime->private_data;
  91         int fragsize_bytes = frames_to_bytes(runtime, runtime->period_size);
  92
  93         fragsize_bytes /= runtime->channels;
  94         /* inflate the fragsize to match the dma width of SPORT */
  95         fragsize_bytes *= 8;
  96
  97         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  98                 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
  99                 sport_config_tx_dma(sport, runtime->dma_area,
 100                         runtime->periods, fragsize_bytes);
 101         } else {
 102                 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
 103                 sport_config_rx_dma(sport, runtime->dma_area,
 104                         runtime->periods, fragsize_bytes);
 105         }
 106
 107         return 0;
 108 }
 109
 110 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 111 {
 112         struct snd_pcm_runtime *runtime = substream->runtime;
 113         struct sport_device *sport = runtime->private_data;
 114         int ret = 0;
 115
 116         switch (cmd) {
 117         case SNDRV_PCM_TRIGGER_START:
 118                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 119                         sport_tx_start(sport);
 120                 else
 121                         sport_rx_start(sport);
 122                 break;
 123         case SNDRV_PCM_TRIGGER_STOP:
 124         case SNDRV_PCM_TRIGGER_SUSPEND:
 125         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 126                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 127                         sport_tx_stop(sport);
 128                 else
 129                         sport_rx_stop(sport);
 130                 break;
 131         default:
 132                 ret = -EINVAL;
 133         }
 134
 135         return ret;
 136 }
 137
 138 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
 139 {
 140         struct snd_pcm_runtime *runtime = substream->runtime;
 141         struct sport_device *sport = runtime->private_data;
 142         unsigned int diff;
 143         snd_pcm_uframes_t frames;
 144
 145         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 146                 diff = sport_curr_offset_tx(sport);
 147                 frames = diff / (8*4); /* 32 bytes per frame */
 148         } else {
 149                 diff = sport_curr_offset_rx(sport);
 150                 frames = diff / (8*4);
 151         }
 152         return frames;
 153 }
 154
 155 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
 156 {
 157         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 158         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 159         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
 160         struct snd_pcm_runtime *runtime = substream->runtime;
 161         struct snd_dma_buffer *buf = &substream->dma_buffer;
 162
 163         int ret = 0;
 164
 165         snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
 166
 167         ret = snd_pcm_hw_constraint_integer(runtime,
 168                 SNDRV_PCM_HW_PARAM_PERIODS);
 169         if (ret < 0)
 170                 goto out;
 171
 172         if (sport_handle != NULL) {
 173                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 174                         sport_handle->tx_buf = buf->area;
 175                 else
 176                         sport_handle->rx_buf = buf->area;
 177
 178                 runtime->private_data = sport_handle;
 179         } else {
 180                 pr_err("sport_handle is NULL\n");
 181                 ret = -ENODEV;
 182         }
 183 out:
 184         return ret;
 185 }
 186
 187 static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
 188         snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
 189 {
 190         struct snd_pcm_runtime *runtime = substream->runtime;
 191         struct sport_device *sport = runtime->private_data;
 192         struct bf5xx_tdm_port *tdm_port = sport->private_data;
 193         unsigned int *src;
 194         unsigned int *dst;
 195         int i;
 196
 197         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 198                 src = buf;
 199                 dst = (unsigned int *)substream->runtime->dma_area;
 200
 201                 dst += pos * 8;
 202                 while (count--) {
 203                         for (i = 0; i < substream->runtime->channels; i++)
 204                                 *(dst + tdm_port->tx_map[i]) = *src++;
 205                         dst += 8;
 206                 }
 207         } else {
 208                 src = (unsigned int *)substream->runtime->dma_area;
 209                 dst = buf;
 210
 211                 src += pos * 8;
 212                 while (count--) {
 213                         for (i = 0; i < substream->runtime->channels; i++)
 214                                 *dst++ = *(src + tdm_port->rx_map[i]);
 215                         src += 8;
 216                 }
 217         }
 218
 219         return 0;
 220 }
 221
 222 static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
 223         int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
 224 {
 225         unsigned char *buf = substream->runtime->dma_area;
 226         buf += pos * 8 * 4;
 227         memset(buf, '\0', count * 8 * 4);
 228
 229         return 0;
 230 }
 231
 232
 233 struct snd_pcm_ops bf5xx_pcm_tdm_ops = {
 234         .open           = bf5xx_pcm_open,
 235         .ioctl          = snd_pcm_lib_ioctl,
 236         .hw_params      = bf5xx_pcm_hw_params,
 237         .hw_free        = bf5xx_pcm_hw_free,
 238         .prepare        = bf5xx_pcm_prepare,
 239         .trigger        = bf5xx_pcm_trigger,
 240         .pointer        = bf5xx_pcm_pointer,
 241         .copy           = bf5xx_pcm_copy,
 242         .silence        = bf5xx_pcm_silence,
 243 };
 244
 245 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 246 {
 247         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 248         struct snd_dma_buffer *buf = &substream->dma_buffer;
 249         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
 250
 251         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 252         buf->dev.dev = pcm->card->dev;
 253         buf->private_data = NULL;
 254         buf->area = dma_alloc_coherent(pcm->card->dev, size * 4,
 255                 &buf->addr, GFP_KERNEL);
 256         if (!buf->area) {
 257                 pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
 258                 return -ENOMEM;
 259         }
 260         buf->bytes = size;
 261
 262         return 0;
 263 }
 264
 265 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 266 {
 267         struct snd_pcm_substream *substream;
 268         struct snd_dma_buffer *buf;
 269         int stream;
 270
 271         for (stream = 0; stream < 2; stream++) {
 272                 substream = pcm->streams[stream].substream;
 273                 if (!substream)
 274                         continue;
 275
 276                 buf = &substream->dma_buffer;
 277                 if (!buf->area)
 278                         continue;
 279                 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
 280                 buf->area = NULL;
 281         }
 282 }
 283
 284 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
 285
 286 static int bf5xx_pcm_tdm_new(struct snd_soc_pcm_runtime *rtd)
 287 {
 288         struct snd_card *card = rtd->card->snd_card;
 289         struct snd_pcm *pcm = rtd->pcm;
 290         int ret = 0;
 291
 292         if (!card->dev->dma_mask)
 293                 card->dev->dma_mask = &bf5xx_pcm_dmamask;
 294         if (!card->dev->coherent_dma_mask)
 295                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 296
 297         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 298                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 299                         SNDRV_PCM_STREAM_PLAYBACK);
 300                 if (ret)
 301                         goto out;
 302         }
 303
 304         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 305                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 306                         SNDRV_PCM_STREAM_CAPTURE);
 307                 if (ret)
 308                         goto out;
 309         }
 310 out:
 311         return ret;
 312 }
 313
 314 static struct snd_soc_platform_driver bf5xx_tdm_soc_platform = {
 315         .ops        = &bf5xx_pcm_tdm_ops,
 316         .pcm_new        = bf5xx_pcm_tdm_new,
 317         .pcm_free       = bf5xx_pcm_free_dma_buffers,
 318 };
 319
 320 static int bf5xx_soc_platform_probe(struct platform_device *pdev)
 321 {
 322         return snd_soc_register_platform(&pdev->dev, &bf5xx_tdm_soc_platform);
 323 }
 324
 325 static int bf5xx_soc_platform_remove(struct platform_device *pdev)
 326 {
 327         snd_soc_unregister_platform(&pdev->dev);
 328         return 0;
 329 }
 330
 331 static struct platform_driver bfin_tdm_driver = {
 332         .driver = {
 333                         .name = "bfin-tdm-pcm-audio",
 334                         .owner = THIS_MODULE,
 335         },
 336
 337         .probe = bf5xx_soc_platform_probe,
 338         .remove = bf5xx_soc_platform_remove,
 339 };
 340
 341 module_platform_driver(bfin_tdm_driver);
 342
 343 MODULE_AUTHOR("Barry Song");
 344 MODULE_DESCRIPTION("ADI Blackfin TDM PCM DMA module");
 345 MODULE_LICENSE("GPL");