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         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  56                                    SNDRV_PCM_FMTBIT_S24_LE |
  57                                    SNDRV_PCM_FMTBIT_S32_LE,
  58         .period_bytes_min       = 32,
  59         .period_bytes_max       = 0x10000,
  60         .periods_min            = 1,
  61         .periods_max            = PAGE_SIZE/32,
  62         .buffer_bytes_max       = 0x20000, /* 128 kbytes */
  63         .fifo_size              = 16,
  64 };
  65
  66 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
  67         struct snd_pcm_hw_params *params)
  68 {
  69         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  70         unsigned int buffer_size = params_buffer_bytes(params);
  71         struct bf5xx_i2s_pcm_data *dma_data;
  72
  73         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  74
  75         if (dma_data->tdm_mode)
  76                 buffer_size = buffer_size / params_channels(params) * 8;
  77
  78         return snd_pcm_lib_malloc_pages(substream, buffer_size);
  79 }
  80
  81 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
  82 {
  83         snd_pcm_lib_free_pages(substream);
  84
  85         return 0;
  86 }
  87
  88 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
  89 {
  90         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  91         struct snd_pcm_runtime *runtime = substream->runtime;
  92         struct sport_device *sport = runtime->private_data;
  93         int period_bytes = frames_to_bytes(runtime, runtime->period_size);
  94         struct bf5xx_i2s_pcm_data *dma_data;
  95
  96         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  97
  98         if (dma_data->tdm_mode)
  99                 period_bytes = period_bytes / runtime->channels * 8;
 100
 101         pr_debug("%s enter\n", __func__);
 102         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 103                 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
 104                 sport_config_tx_dma(sport, runtime->dma_area,
 105                         runtime->periods, period_bytes);
 106         } else {
 107                 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
 108                 sport_config_rx_dma(sport, runtime->dma_area,
 109                         runtime->periods, period_bytes);
 110         }
 111
 112         return 0;
 113 }
 114
 115 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 116 {
 117         struct snd_pcm_runtime *runtime = substream->runtime;
 118         struct sport_device *sport = runtime->private_data;
 119         int ret = 0;
 120
 121         pr_debug("%s enter\n", __func__);
 122         switch (cmd) {
 123         case SNDRV_PCM_TRIGGER_START:
 124                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 125                         sport_tx_start(sport);
 126                 else
 127                         sport_rx_start(sport);
 128                 break;
 129         case SNDRV_PCM_TRIGGER_STOP:
 130         case SNDRV_PCM_TRIGGER_SUSPEND:
 131         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 132                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 133                         sport_tx_stop(sport);
 134                 else
 135                         sport_rx_stop(sport);
 136                 break;
 137         default:
 138                 ret = -EINVAL;
 139         }
 140
 141         return ret;
 142 }
 143
 144 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
 145 {
 146         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 147         struct snd_pcm_runtime *runtime = substream->runtime;
 148         struct sport_device *sport = runtime->private_data;
 149         unsigned int diff;
 150         snd_pcm_uframes_t frames;
 151         struct bf5xx_i2s_pcm_data *dma_data;
 152
 153         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 154
 155         pr_debug("%s enter\n", __func__);
 156         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 157                 diff = sport_curr_offset_tx(sport);
 158         } else {
 159                 diff = sport_curr_offset_rx(sport);
 160         }
 161
 162         /*
 163          * TX at least can report one frame beyond the end of the
 164          * buffer if we hit the wraparound case - clamp to within the
 165          * buffer as the ALSA APIs require.
 166          */
 167         if (diff == snd_pcm_lib_buffer_bytes(substream))
 168                 diff = 0;
 169
 170         frames = bytes_to_frames(substream->runtime, diff);
 171         if (dma_data->tdm_mode)
 172                 frames = frames * runtime->channels / 8;
 173
 174         return frames;
 175 }
 176
 177 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
 178 {
 179         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 180         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 181         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
 182         struct snd_pcm_runtime *runtime = substream->runtime;
 183         struct snd_dma_buffer *buf = &substream->dma_buffer;
 184         struct bf5xx_i2s_pcm_data *dma_data;
 185         int ret;
 186
 187         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 188
 189         pr_debug("%s enter\n", __func__);
 190
 191         snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
 192         if (dma_data->tdm_mode)
 193                 runtime->hw.buffer_bytes_max /= 4;
 194         else
 195                 runtime->hw.info |= SNDRV_PCM_INFO_MMAP;
 196
 197         ret = snd_pcm_hw_constraint_integer(runtime,
 198                         SNDRV_PCM_HW_PARAM_PERIODS);
 199         if (ret < 0)
 200                 goto out;
 201
 202         if (sport_handle != NULL) {
 203                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 204                         sport_handle->tx_buf = buf->area;
 205                 else
 206                         sport_handle->rx_buf = buf->area;
 207
 208                 runtime->private_data = sport_handle;
 209         } else {
 210                 pr_err("sport_handle is NULL\n");
 211                 return -1;
 212         }
 213         return 0;
 214
 215  out:
 216         return ret;
 217 }
 218
 219 static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
 220         struct vm_area_struct *vma)
 221 {
 222         struct snd_pcm_runtime *runtime = substream->runtime;
 223         size_t size = vma->vm_end - vma->vm_start;
 224         vma->vm_start = (unsigned long)runtime->dma_area;
 225         vma->vm_end = vma->vm_start + size;
 226         vma->vm_flags |=  VM_SHARED;
 227
 228         return 0 ;
 229 }
 230
 231 static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
 232         snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
 233 {
 234         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 235         struct snd_pcm_runtime *runtime = substream->runtime;
 236         unsigned int sample_size = runtime->sample_bits / 8;
 237         struct bf5xx_i2s_pcm_data *dma_data;
 238         unsigned int i;
 239         void *src, *dst;
 240
 241         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 242
 243         if (dma_data->tdm_mode) {
 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 += frames_to_bytes(runtime, pos);
 276                 } else {
 277                         src = runtime->dma_area;
 278                         src += frames_to_bytes(runtime, pos);
 279                         dst = buf;
 280                 }
 281
 282                 memcpy(dst, src, frames_to_bytes(runtime, count));
 283         }
 284
 285         return 0;
 286 }
 287
 288 static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
 289         int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
 290 {
 291         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 292         struct snd_pcm_runtime *runtime = substream->runtime;
 293         unsigned int sample_size = runtime->sample_bits / 8;
 294         void *buf = runtime->dma_area;
 295         struct bf5xx_i2s_pcm_data *dma_data;
 296         unsigned int offset, size;
 297
 298         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 299
 300         if (dma_data->tdm_mode) {
 301                 offset = pos * 8 * sample_size;
 302                 size = count * 8 * sample_size;
 303         } else {
 304                 offset = frames_to_bytes(runtime, pos);
 305                 size = frames_to_bytes(runtime, count);
 306         }
 307
 308         snd_pcm_format_set_silence(runtime->format, buf + offset, size);
 309
 310         return 0;
 311 }
 312
 313 static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
 314         .open           = bf5xx_pcm_open,
 315         .ioctl          = snd_pcm_lib_ioctl,
 316         .hw_params      = bf5xx_pcm_hw_params,
 317         .hw_free        = bf5xx_pcm_hw_free,
 318         .prepare        = bf5xx_pcm_prepare,
 319         .trigger        = bf5xx_pcm_trigger,
 320         .pointer        = bf5xx_pcm_pointer,
 321         .mmap           = bf5xx_pcm_mmap,
 322         .copy           = bf5xx_pcm_copy,
 323         .silence        = bf5xx_pcm_silence,
 324 };
 325
 326 static int bf5xx_pcm_i2s_new(struct snd_soc_pcm_runtime *rtd)
 327 {
 328         struct snd_card *card = rtd->card->snd_card;
 329         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
 330         int ret;
 331
 332         pr_debug("%s enter\n", __func__);
 333         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 334         if (ret)
 335                 return ret;
 336
 337         return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
 338                                 SNDRV_DMA_TYPE_DEV, card->dev, size, size);
 339 }
 340
 341 static struct snd_soc_platform_driver bf5xx_i2s_soc_platform = {
 342         .ops            = &bf5xx_pcm_i2s_ops,
 343         .pcm_new        = bf5xx_pcm_i2s_new,
 344 };
 345
 346 static int bfin_i2s_soc_platform_probe(struct platform_device *pdev)
 347 {
 348         return snd_soc_register_platform(&pdev->dev, &bf5xx_i2s_soc_platform);
 349 }
 350
 351 static int bfin_i2s_soc_platform_remove(struct platform_device *pdev)
 352 {
 353         snd_soc_unregister_platform(&pdev->dev);
 354         return 0;
 355 }
 356
 357 static struct platform_driver bfin_i2s_pcm_driver = {
 358         .driver = {
 359                 .name = "bfin-i2s-pcm-audio",
 360                 .owner = THIS_MODULE,
 361         },
 362
 363         .probe = bfin_i2s_soc_platform_probe,
 364         .remove = bfin_i2s_soc_platform_remove,
 365 };
 366
 367 module_platform_driver(bfin_i2s_pcm_driver);
 368
 369 MODULE_AUTHOR("Cliff Cai");
 370 MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
 371 MODULE_LICENSE("GPL");