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_pcm_runtime *runtime = substream->runtime;
 158         int ret = 0;
 159
 160         snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
 161
 162         ret = snd_pcm_hw_constraint_integer(runtime,
 163                 SNDRV_PCM_HW_PARAM_PERIODS);
 164         if (ret < 0)
 165                 goto out;
 166
 167         if (sport_handle != NULL)
 168                 runtime->private_data = sport_handle;
 169         else {
 170                 pr_err("sport_handle is NULL\n");
 171                 ret = -ENODEV;
 172         }
 173 out:
 174         return ret;
 175 }
 176
 177 static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
 178         snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
 179 {
 180         struct snd_pcm_runtime *runtime = substream->runtime;
 181         struct sport_device *sport = runtime->private_data;
 182         struct bf5xx_tdm_port *tdm_port = sport->private_data;
 183         unsigned int *src;
 184         unsigned int *dst;
 185         int i;
 186
 187         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 188                 src = buf;
 189                 dst = (unsigned int *)substream->runtime->dma_area;
 190
 191                 dst += pos * 8;
 192                 while (count--) {
 193                         for (i = 0; i < substream->runtime->channels; i++)
 194                                 *(dst + tdm_port->tx_map[i]) = *src++;
 195                         dst += 8;
 196                 }
 197         } else {
 198                 src = (unsigned int *)substream->runtime->dma_area;
 199                 dst = buf;
 200
 201                 src += pos * 8;
 202                 while (count--) {
 203                         for (i = 0; i < substream->runtime->channels; i++)
 204                                 *dst++ = *(src + tdm_port->rx_map[i]);
 205                         src += 8;
 206                 }
 207         }
 208
 209         return 0;
 210 }
 211
 212 static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
 213         int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
 214 {
 215         unsigned char *buf = substream->runtime->dma_area;
 216         buf += pos * 8 * 4;
 217         memset(buf, '\0', count * 8 * 4);
 218
 219         return 0;
 220 }
 221
 222
 223 struct snd_pcm_ops bf5xx_pcm_tdm_ops = {
 224         .open           = bf5xx_pcm_open,
 225         .ioctl          = snd_pcm_lib_ioctl,
 226         .hw_params      = bf5xx_pcm_hw_params,
 227         .hw_free        = bf5xx_pcm_hw_free,
 228         .prepare        = bf5xx_pcm_prepare,
 229         .trigger        = bf5xx_pcm_trigger,
 230         .pointer        = bf5xx_pcm_pointer,
 231         .copy           = bf5xx_pcm_copy,
 232         .silence        = bf5xx_pcm_silence,
 233 };
 234
 235 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 236 {
 237         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 238         struct snd_dma_buffer *buf = &substream->dma_buffer;
 239         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
 240
 241         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 242         buf->dev.dev = pcm->card->dev;
 243         buf->private_data = NULL;
 244         buf->area = dma_alloc_coherent(pcm->card->dev, size * 4,
 245                 &buf->addr, GFP_KERNEL);
 246         if (!buf->area) {
 247                 pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
 248                 return -ENOMEM;
 249         }
 250         buf->bytes = size;
 251
 252         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 253                 sport_handle->tx_buf = buf->area;
 254         else
 255                 sport_handle->rx_buf = buf->area;
 256
 257         return 0;
 258 }
 259
 260 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 261 {
 262         struct snd_pcm_substream *substream;
 263         struct snd_dma_buffer *buf;
 264         int stream;
 265
 266         for (stream = 0; stream < 2; stream++) {
 267                 substream = pcm->streams[stream].substream;
 268                 if (!substream)
 269                         continue;
 270
 271                 buf = &substream->dma_buffer;
 272                 if (!buf->area)
 273                         continue;
 274                 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
 275                 buf->area = NULL;
 276         }
 277         if (sport_handle)
 278                 sport_done(sport_handle);
 279 }
 280
 281 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
 282
 283 static int bf5xx_pcm_tdm_new(struct snd_card *card, struct snd_soc_dai *dai,
 284         struct snd_pcm *pcm)
 285 {
 286         int ret = 0;
 287
 288         if (!card->dev->dma_mask)
 289                 card->dev->dma_mask = &bf5xx_pcm_dmamask;
 290         if (!card->dev->coherent_dma_mask)
 291                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 292
 293         if (dai->driver->playback.channels_min) {
 294                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 295                         SNDRV_PCM_STREAM_PLAYBACK);
 296                 if (ret)
 297                         goto out;
 298         }
 299
 300         if (dai->driver->capture.channels_min) {
 301                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 302                         SNDRV_PCM_STREAM_CAPTURE);
 303                 if (ret)
 304                         goto out;
 305         }
 306 out:
 307         return ret;
 308 }
 309
 310 static struct snd_soc_platform_driver bf5xx_tdm_soc_platform = {
 311         .ops        = &bf5xx_pcm_tdm_ops,
 312         .pcm_new        = bf5xx_pcm_tdm_new,
 313         .pcm_free       = bf5xx_pcm_free_dma_buffers,
 314 };
 315
 316 static int __devinit bf5xx_soc_platform_probe(struct platform_device *pdev)
 317 {
 318         return snd_soc_register_platform(&pdev->dev, &bf5xx_tdm_soc_platform);
 319 }
 320
 321 static int __devexit bf5xx_soc_platform_remove(struct platform_device *pdev)
 322 {
 323         snd_soc_unregister_platform(&pdev->dev);
 324         return 0;
 325 }
 326
 327 static struct platform_driver bfin_tdm_driver = {
 328         .driver = {
 329                         .name = "bf5xx-tdm-pcm-audio",
 330                         .owner = THIS_MODULE,
 331         },
 332
 333         .probe = bf5xx_soc_platform_probe,
 334         .remove = __devexit_p(bf5xx_soc_platform_remove),
 335 };
 336
 337 static int __init snd_bfin_tdm_init(void)
 338 {
 339         return platform_driver_register(&bfin_tdm_driver);
 340 }
 341 module_init(snd_bfin_tdm_init);
 342
 343 static void __exit snd_bfin_tdm_exit(void)
 344 {
 345         platform_driver_unregister(&bfin_tdm_driver);
 346 }
 347 module_exit(snd_bfin_tdm_exit);
 348
 349 MODULE_AUTHOR("Barry Song");
 350 MODULE_DESCRIPTION("ADI Blackfin TDM PCM DMA module");
 351 MODULE_LICENSE("GPL");