sound/soc/blackfin/bf5xx-i2s-pcm.c

   1 /*
   2  * File:         sound/soc/blackfin/bf5xx-i2s-pcm.c
   3  * Author:       Cliff Cai <Cliff.Cai@analog.com>
   4  *
   5  * Created:      Tue June 06 2008
   6  * Description:  DMA driver for i2s codec
   7  *
   8  * Modified:
   9  *               Copyright 2008 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-sport.h"
  43 #include "bf5xx-i2s-pcm.h"
  44
  45 static void bf5xx_dma_irq(void *data)
  46 {
  47         struct snd_pcm_substream *pcm = data;
  48         snd_pcm_period_elapsed(pcm);
  49 }
  50
  51 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
  52         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
  53                                    SNDRV_PCM_INFO_MMAP_VALID |
  54                                    SNDRV_PCM_INFO_BLOCK_TRANSFER,
  55         .period_bytes_min       = 32,
  56         .period_bytes_max       = 0x10000,
  57         .periods_min            = 1,
  58         .periods_max            = PAGE_SIZE/32,
  59         .buffer_bytes_max       = 0x20000, /* 128 kbytes */
  60         .fifo_size              = 16,
  61 };
  62
  63 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
  64         struct snd_pcm_hw_params *params)
  65 {
  66         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  67         unsigned int buffer_size = params_buffer_bytes(params);
  68         struct bf5xx_i2s_pcm_data *dma_data;
  69
  70         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  71
  72         if (dma_data->tdm_mode)
  73                 buffer_size = buffer_size / params_channels(params) * 8;
  74
  75         return snd_pcm_lib_malloc_pages(substream, buffer_size);
  76 }
  77
  78 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
  79 {
  80         snd_pcm_lib_free_pages(substream);
  81
  82         return 0;
  83 }
  84
  85 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
  86 {
  87         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  88         struct snd_pcm_runtime *runtime = substream->runtime;
  89         struct sport_device *sport = runtime->private_data;
  90         int period_bytes = frames_to_bytes(runtime, runtime->period_size);
  91         struct bf5xx_i2s_pcm_data *dma_data;
  92
  93         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  94
  95         if (dma_data->tdm_mode)
  96                 period_bytes = period_bytes / runtime->channels * 8;
  97
  98         pr_debug("%s enter\n", __func__);
  99         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 100                 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
 101                 sport_config_tx_dma(sport, runtime->dma_area,
 102                         runtime->periods, period_bytes);
 103         } else {
 104                 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
 105                 sport_config_rx_dma(sport, runtime->dma_area,
 106                         runtime->periods, period_bytes);
 107         }
 108
 109         return 0;
 110 }
 111
 112 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 113 {
 114         struct snd_pcm_runtime *runtime = substream->runtime;
 115         struct sport_device *sport = runtime->private_data;
 116         int ret = 0;
 117
 118         pr_debug("%s enter\n", __func__);
 119         switch (cmd) {
 120         case SNDRV_PCM_TRIGGER_START:
 121                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 122                         sport_tx_start(sport);
 123                 else
 124                         sport_rx_start(sport);
 125                 break;
 126         case SNDRV_PCM_TRIGGER_STOP:
 127         case SNDRV_PCM_TRIGGER_SUSPEND:
 128         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 129                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 130                         sport_tx_stop(sport);
 131                 else
 132                         sport_rx_stop(sport);
 133                 break;
 134         default:
 135                 ret = -EINVAL;
 136         }
 137
 138         return ret;
 139 }
 140
 141 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
 142 {
 143         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 144         struct snd_pcm_runtime *runtime = substream->runtime;
 145         struct sport_device *sport = runtime->private_data;
 146         unsigned int diff;
 147         snd_pcm_uframes_t frames;
 148         struct bf5xx_i2s_pcm_data *dma_data;
 149
 150         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 151
 152         pr_debug("%s enter\n", __func__);
 153         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 154                 diff = sport_curr_offset_tx(sport);
 155         } else {
 156                 diff = sport_curr_offset_rx(sport);
 157         }
 158
 159         /*
 160          * TX at least can report one frame beyond the end of the
 161          * buffer if we hit the wraparound case - clamp to within the
 162          * buffer as the ALSA APIs require.
 163          */
 164         if (diff == snd_pcm_lib_buffer_bytes(substream))
 165                 diff = 0;
 166
 167         frames = bytes_to_frames(substream->runtime, diff);
 168         if (dma_data->tdm_mode)
 169                 frames = frames * runtime->channels / 8;
 170
 171         return frames;
 172 }
 173
 174 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
 175 {
 176         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 177         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 178         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
 179         struct snd_pcm_runtime *runtime = substream->runtime;
 180         struct snd_dma_buffer *buf = &substream->dma_buffer;
 181         struct bf5xx_i2s_pcm_data *dma_data;
 182         int ret;
 183
 184         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 185
 186         pr_debug("%s enter\n", __func__);
 187
 188         snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
 189         if (dma_data->tdm_mode)
 190                 runtime->hw.buffer_bytes_max /= 4;
 191         else
 192                 runtime->hw.info |= SNDRV_PCM_INFO_MMAP;
 193
 194         ret = snd_pcm_hw_constraint_integer(runtime,
 195                         SNDRV_PCM_HW_PARAM_PERIODS);
 196         if (ret < 0)
 197                 goto out;
 198
 199         if (sport_handle != NULL) {
 200                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 201                         sport_handle->tx_buf = buf->area;
 202                 else
 203                         sport_handle->rx_buf = buf->area;
 204
 205                 runtime->private_data = sport_handle;
 206         } else {
 207                 pr_err("sport_handle is NULL\n");
 208                 return -1;
 209         }
 210         return 0;
 211
 212  out:
 213         return ret;
 214 }
 215
 216 static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
 217         struct vm_area_struct *vma)
 218 {
 219         struct snd_pcm_runtime *runtime = substream->runtime;
 220         size_t size = vma->vm_end - vma->vm_start;
 221         vma->vm_start = (unsigned long)runtime->dma_area;
 222         vma->vm_end = vma->vm_start + size;
 223         vma->vm_flags |=  VM_SHARED;
 224
 225         return 0 ;
 226 }
 227
 228 static int bf5xx_pcm_copy(struct snd_pcm_substream *substream,
 229                           int channel, unsigned long pos,
 230                           void *buf, unsigned long count)
 231 {
 232         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 233         struct snd_pcm_runtime *runtime = substream->runtime;
 234         unsigned int sample_size = runtime->sample_bits / 8;
 235         struct bf5xx_i2s_pcm_data *dma_data;
 236         unsigned int i;
 237         void *src, *dst;
 238
 239         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 240
 241         if (dma_data->tdm_mode) {
 242                 pos = bytes_to_frames(runtime, pos);
 243                 count = bytes_to_frames(runtime, count);
 244                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 245                         src = buf;
 246                         dst = runtime->dma_area;
 247                         dst += pos * sample_size * 8;
 248
 249                         while (count--) {
 250                                 for (i = 0; i < runtime->channels; i++) {
 251                                         memcpy(dst + dma_data->map[i] *
 252                                                 sample_size, src, sample_size);
 253                                         src += sample_size;
 254                                 }
 255                                 dst += 8 * sample_size;
 256                         }
 257                 } else {
 258                         src = runtime->dma_area;
 259                         src += pos * sample_size * 8;
 260                         dst = buf;
 261
 262                         while (count--) {
 263                                 for (i = 0; i < runtime->channels; i++) {
 264                                         memcpy(dst, src + dma_data->map[i] *
 265                                                 sample_size, sample_size);
 266                                         dst += sample_size;
 267                                 }
 268                                 src += 8 * sample_size;
 269                         }
 270                 }
 271         } else {
 272                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 273                         src = buf;
 274                         dst = runtime->dma_area;
 275                         dst += pos;
 276                 } else {
 277                         src = runtime->dma_area;
 278                         src += pos;
 279                         dst = buf;
 280                 }
 281
 282                 memcpy(dst, src, count);
 283         }
 284
 285         return 0;
 286 }
 287
 288 static int bf5xx_pcm_copy_user(struct snd_pcm_substream *substream,
 289                                int channel, unsigned long pos,
 290                                void __user *buf, unsigned long count)
 291 {
 292         return bf5xx_pcm_copy(substream, channel, pos, (void *)buf, count);
 293 }
 294
 295 static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
 296                              int channel, unsigned long pos,
 297                              unsigned long count)
 298 {
 299         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 300         struct snd_pcm_runtime *runtime = substream->runtime;
 301         unsigned int sample_size = runtime->sample_bits / 8;
 302         void *buf = runtime->dma_area;
 303         struct bf5xx_i2s_pcm_data *dma_data;
 304         unsigned int offset, samples;
 305
 306         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 307
 308         if (dma_data->tdm_mode) {
 309                 offset = bytes_to_frames(runtime, pos) * 8 * sample_size;
 310                 samples = bytes_to_frames(runtime, count) * 8;
 311         } else {
 312                 offset = pos;
 313                 samples = bytes_to_samples(runtime, count);
 314         }
 315
 316         snd_pcm_format_set_silence(runtime->format, buf + offset, samples);
 317
 318         return 0;
 319 }
 320
 321 static const struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
 322         .open           = bf5xx_pcm_open,
 323         .ioctl          = snd_pcm_lib_ioctl,
 324         .hw_params      = bf5xx_pcm_hw_params,
 325         .hw_free        = bf5xx_pcm_hw_free,
 326         .prepare        = bf5xx_pcm_prepare,
 327         .trigger        = bf5xx_pcm_trigger,
 328         .pointer        = bf5xx_pcm_pointer,
 329         .mmap           = bf5xx_pcm_mmap,
 330         .copy_user      = bf5xx_pcm_copy_user,
 331         .copy_kernel    = bf5xx_pcm_copy,
 332         .fill_silence   = bf5xx_pcm_silence,
 333 };
 334
 335 static int bf5xx_pcm_i2s_new(struct snd_soc_pcm_runtime *rtd)
 336 {
 337         struct snd_card *card = rtd->card->snd_card;
 338         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
 339         int ret;
 340
 341         pr_debug("%s enter\n", __func__);
 342         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 343         if (ret)
 344                 return ret;
 345
 346         return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
 347                                 SNDRV_DMA_TYPE_DEV, card->dev, size, size);
 348 }
 349
 350 static struct snd_soc_platform_driver bf5xx_i2s_soc_platform = {
 351         .ops            = &bf5xx_pcm_i2s_ops,
 352         .pcm_new        = bf5xx_pcm_i2s_new,
 353 };
 354
 355 static int bfin_i2s_soc_platform_probe(struct platform_device *pdev)
 356 {
 357         return devm_snd_soc_register_platform(&pdev->dev,
 358                                               &bf5xx_i2s_soc_platform);
 359 }
 360
 361 static struct platform_driver bfin_i2s_pcm_driver = {
 362         .driver = {
 363                 .name = "bfin-i2s-pcm-audio",
 364         },
 365
 366         .probe = bfin_i2s_soc_platform_probe,
 367 };
 368
 369 module_platform_driver(bfin_i2s_pcm_driver);
 370
 371 MODULE_AUTHOR("Cliff Cai");
 372 MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
 373 MODULE_LICENSE("GPL");