sound/soc/tegra/tegra_pcm.c

   1 /*
   2  * tegra_pcm.c - Tegra PCM driver
   3  *
   4  * Author: Stephen Warren <swarren@nvidia.com>
   5  * Copyright (C) 2010 - NVIDIA, Inc.
   6  *
   7  * Based on code copyright/by:
   8  *
   9  * Copyright (c) 2009-2010, NVIDIA Corporation.
  10  * Scott Peterson <speterson@nvidia.com>
  11  * Vijay Mali <vmali@nvidia.com>
  12  *
  13  * Copyright (C) 2010 Google, Inc.
  14  * Iliyan Malchev <malchev@google.com>
  15  *
  16  * This program is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU General Public License
  18  * version 2 as published by the Free Software Foundation.
  19  *
  20  * This program is distributed in the hope that it will be useful, but
  21  * WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  23  * General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  28  * 02110-1301 USA
  29  *
  30  */
  31
  32 #include <linux/module.h>
  33 #include <linux/dma-mapping.h>
  34 #include <linux/slab.h>
  35 #include <sound/core.h>
  36 #include <sound/pcm.h>
  37 #include <sound/pcm_params.h>
  38 #include <sound/soc.h>
  39
  40 #include "tegra_pcm.h"
  41
  42 #define DRV_NAME "tegra-pcm-audio"
  43
  44 static const struct snd_pcm_hardware tegra_pcm_hardware = {
  45         .info                   = SNDRV_PCM_INFO_MMAP |
  46                                   SNDRV_PCM_INFO_MMAP_VALID |
  47                                   SNDRV_PCM_INFO_PAUSE |
  48                                   SNDRV_PCM_INFO_RESUME |
  49                                   SNDRV_PCM_INFO_INTERLEAVED,
  50         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
  51         .channels_min           = 2,
  52         .channels_max           = 2,
  53         .period_bytes_min       = 1024,
  54         .period_bytes_max       = PAGE_SIZE,
  55         .periods_min            = 2,
  56         .periods_max            = 8,
  57         .buffer_bytes_max       = PAGE_SIZE * 8,
  58         .fifo_size              = 4,
  59 };
  60
  61 static void tegra_pcm_queue_dma(struct tegra_runtime_data *prtd)
  62 {
  63         struct snd_pcm_substream *substream = prtd->substream;
  64         struct snd_dma_buffer *buf = &substream->dma_buffer;
  65         struct tegra_dma_req *dma_req;
  66         unsigned long addr;
  67
  68         dma_req = &prtd->dma_req[prtd->dma_req_idx];
  69         prtd->dma_req_idx = 1 - prtd->dma_req_idx;
  70
  71         addr = buf->addr + prtd->dma_pos;
  72         prtd->dma_pos += dma_req->size;
  73         if (prtd->dma_pos >= prtd->dma_pos_end)
  74                 prtd->dma_pos = 0;
  75
  76         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  77                 dma_req->source_addr = addr;
  78         else
  79                 dma_req->dest_addr = addr;
  80
  81         tegra_dma_enqueue_req(prtd->dma_chan, dma_req);
  82 }
  83
  84 static void dma_complete_callback(struct tegra_dma_req *req)
  85 {
  86         struct tegra_runtime_data *prtd = (struct tegra_runtime_data *)req->dev;
  87         struct snd_pcm_substream *substream = prtd->substream;
  88         struct snd_pcm_runtime *runtime = substream->runtime;
  89
  90         spin_lock(&prtd->lock);
  91
  92         if (!prtd->running) {
  93                 spin_unlock(&prtd->lock);
  94                 return;
  95         }
  96
  97         if (++prtd->period_index >= runtime->periods)
  98                 prtd->period_index = 0;
  99
 100         tegra_pcm_queue_dma(prtd);
 101
 102         spin_unlock(&prtd->lock);
 103
 104         snd_pcm_period_elapsed(substream);
 105 }
 106
 107 static void setup_dma_tx_request(struct tegra_dma_req *req,
 108                                         struct tegra_pcm_dma_params * dmap)
 109 {
 110         req->complete = dma_complete_callback;
 111         req->to_memory = false;
 112         req->dest_addr = dmap->addr;
 113         req->dest_wrap = dmap->wrap;
 114         req->source_bus_width = 32;
 115         req->source_wrap = 0;
 116         req->dest_bus_width = dmap->width;
 117         req->req_sel = dmap->req_sel;
 118 }
 119
 120 static void setup_dma_rx_request(struct tegra_dma_req *req,
 121                                         struct tegra_pcm_dma_params * dmap)
 122 {
 123         req->complete = dma_complete_callback;
 124         req->to_memory = true;
 125         req->source_addr = dmap->addr;
 126         req->dest_wrap = 0;
 127         req->source_bus_width = dmap->width;
 128         req->source_wrap = dmap->wrap;
 129         req->dest_bus_width = 32;
 130         req->req_sel = dmap->req_sel;
 131 }
 132
 133 static int tegra_pcm_open(struct snd_pcm_substream *substream)
 134 {
 135         struct snd_pcm_runtime *runtime = substream->runtime;
 136         struct tegra_runtime_data *prtd;
 137         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 138         struct tegra_pcm_dma_params * dmap;
 139         int ret = 0;
 140
 141         prtd = kzalloc(sizeof(struct tegra_runtime_data), GFP_KERNEL);
 142         if (prtd == NULL)
 143                 return -ENOMEM;
 144
 145         runtime->private_data = prtd;
 146         prtd->substream = substream;
 147
 148         spin_lock_init(&prtd->lock);
 149
 150         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 151                 dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 152                 setup_dma_tx_request(&prtd->dma_req[0], dmap);
 153                 setup_dma_tx_request(&prtd->dma_req[1], dmap);
 154         } else {
 155                 dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 156                 setup_dma_rx_request(&prtd->dma_req[0], dmap);
 157                 setup_dma_rx_request(&prtd->dma_req[1], dmap);
 158         }
 159
 160         prtd->dma_req[0].dev = prtd;
 161         prtd->dma_req[1].dev = prtd;
 162
 163         prtd->dma_chan = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT);
 164         if (prtd->dma_chan == NULL) {
 165                 ret = -ENOMEM;
 166                 goto err;
 167         }
 168
 169         /* Set HW params now that initialization is complete */
 170         snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
 171
 172         /* Ensure that buffer size is a multiple of period size */
 173         ret = snd_pcm_hw_constraint_integer(runtime,
 174                                                 SNDRV_PCM_HW_PARAM_PERIODS);
 175         if (ret < 0)
 176                 goto err;
 177
 178         return 0;
 179
 180 err:
 181         if (prtd->dma_chan) {
 182                 tegra_dma_free_channel(prtd->dma_chan);
 183         }
 184
 185         kfree(prtd);
 186
 187         return ret;
 188 }
 189
 190 static int tegra_pcm_close(struct snd_pcm_substream *substream)
 191 {
 192         struct snd_pcm_runtime *runtime = substream->runtime;
 193         struct tegra_runtime_data *prtd = runtime->private_data;
 194
 195         tegra_dma_free_channel(prtd->dma_chan);
 196
 197         kfree(prtd);
 198
 199         return 0;
 200 }
 201
 202 static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
 203                                 struct snd_pcm_hw_params *params)
 204 {
 205         struct snd_pcm_runtime *runtime = substream->runtime;
 206         struct tegra_runtime_data *prtd = runtime->private_data;
 207
 208         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 209
 210         prtd->dma_req[0].size = params_period_bytes(params);
 211         prtd->dma_req[1].size = prtd->dma_req[0].size;
 212
 213         return 0;
 214 }
 215
 216 static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
 217 {
 218         snd_pcm_set_runtime_buffer(substream, NULL);
 219
 220         return 0;
 221 }
 222
 223 static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 224 {
 225         struct snd_pcm_runtime *runtime = substream->runtime;
 226         struct tegra_runtime_data *prtd = runtime->private_data;
 227         unsigned long flags;
 228
 229         switch (cmd) {
 230         case SNDRV_PCM_TRIGGER_START:
 231                 prtd->dma_pos = 0;
 232                 prtd->dma_pos_end = frames_to_bytes(runtime, runtime->periods * runtime->period_size);
 233                 prtd->period_index = 0;
 234                 prtd->dma_req_idx = 0;
 235                 /* Fall-through */
 236         case SNDRV_PCM_TRIGGER_RESUME:
 237         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 238                 spin_lock_irqsave(&prtd->lock, flags);
 239                 prtd->running = 1;
 240                 spin_unlock_irqrestore(&prtd->lock, flags);
 241                 tegra_pcm_queue_dma(prtd);
 242                 tegra_pcm_queue_dma(prtd);
 243                 break;
 244         case SNDRV_PCM_TRIGGER_STOP:
 245         case SNDRV_PCM_TRIGGER_SUSPEND:
 246         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 247                 spin_lock_irqsave(&prtd->lock, flags);
 248                 prtd->running = 0;
 249                 spin_unlock_irqrestore(&prtd->lock, flags);
 250                 tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[0]);
 251                 tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[1]);
 252                 break;
 253         default:
 254                 return -EINVAL;
 255         }
 256
 257         return 0;
 258 }
 259
 260 static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
 261 {
 262         struct snd_pcm_runtime *runtime = substream->runtime;
 263         struct tegra_runtime_data *prtd = runtime->private_data;
 264
 265         return prtd->period_index * runtime->period_size;
 266 }
 267
 268
 269 static int tegra_pcm_mmap(struct snd_pcm_substream *substream,
 270                                 struct vm_area_struct *vma)
 271 {
 272         struct snd_pcm_runtime *runtime = substream->runtime;
 273
 274         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 275                                         runtime->dma_area,
 276                                         runtime->dma_addr,
 277                                         runtime->dma_bytes);
 278 }
 279
 280 static struct snd_pcm_ops tegra_pcm_ops = {
 281         .open           = tegra_pcm_open,
 282         .close          = tegra_pcm_close,
 283         .ioctl          = snd_pcm_lib_ioctl,
 284         .hw_params      = tegra_pcm_hw_params,
 285         .hw_free        = tegra_pcm_hw_free,
 286         .trigger        = tegra_pcm_trigger,
 287         .pointer        = tegra_pcm_pointer,
 288         .mmap           = tegra_pcm_mmap,
 289 };
 290
 291 static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 292 {
 293         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 294         struct snd_dma_buffer *buf = &substream->dma_buffer;
 295         size_t size = tegra_pcm_hardware.buffer_bytes_max;
 296
 297         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 298                                                 &buf->addr, GFP_KERNEL);
 299         if (!buf->area)
 300                 return -ENOMEM;
 301
 302         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 303         buf->dev.dev = pcm->card->dev;
 304         buf->private_data = NULL;
 305         buf->bytes = size;
 306
 307         return 0;
 308 }
 309
 310 static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 311 {
 312         struct snd_pcm_substream *substream;
 313         struct snd_dma_buffer *buf;
 314
 315         substream = pcm->streams[stream].substream;
 316         if (!substream)
 317                 return;
 318
 319         buf = &substream->dma_buffer;
 320         if (!buf->area)
 321                 return;
 322
 323         dma_free_writecombine(pcm->card->dev, buf->bytes,
 324                                 buf->area, buf->addr);
 325         buf->area = NULL;
 326 }
 327
 328 static u64 tegra_dma_mask = DMA_BIT_MASK(32);
 329
 330 static int tegra_pcm_new(struct snd_soc_pcm_runtime *rtd)
 331 {
 332         struct snd_card *card = rtd->card->snd_card;
 333         struct snd_soc_dai *dai = rtd->cpu_dai;
 334         struct snd_pcm *pcm = rtd->pcm;
 335         int ret = 0;
 336
 337         if (!card->dev->dma_mask)
 338                 card->dev->dma_mask = &tegra_dma_mask;
 339         if (!card->dev->coherent_dma_mask)
 340                 card->dev->coherent_dma_mask = 0xffffffff;
 341
 342         if (dai->driver->playback.channels_min) {
 343                 ret = tegra_pcm_preallocate_dma_buffer(pcm,
 344                                                 SNDRV_PCM_STREAM_PLAYBACK);
 345                 if (ret)
 346                         goto err;
 347         }
 348
 349         if (dai->driver->capture.channels_min) {
 350                 ret = tegra_pcm_preallocate_dma_buffer(pcm,
 351                                                 SNDRV_PCM_STREAM_CAPTURE);
 352                 if (ret)
 353                         goto err_free_play;
 354         }
 355
 356         return 0;
 357
 358 err_free_play:
 359         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
 360 err:
 361         return ret;
 362 }
 363
 364 static void tegra_pcm_free(struct snd_pcm *pcm)
 365 {
 366         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
 367         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
 368 }
 369
 370 struct snd_soc_platform_driver tegra_pcm_platform = {
 371         .ops            = &tegra_pcm_ops,
 372         .pcm_new        = tegra_pcm_new,
 373         .pcm_free       = tegra_pcm_free,
 374 };
 375
 376 static int __devinit tegra_pcm_platform_probe(struct platform_device *pdev)
 377 {
 378         return snd_soc_register_platform(&pdev->dev, &tegra_pcm_platform);
 379 }
 380
 381 static int __devexit tegra_pcm_platform_remove(struct platform_device *pdev)
 382 {
 383         snd_soc_unregister_platform(&pdev->dev);
 384         return 0;
 385 }
 386
 387 static struct platform_driver tegra_pcm_driver = {
 388         .driver = {
 389                 .name = DRV_NAME,
 390                 .owner = THIS_MODULE,
 391         },
 392         .probe = tegra_pcm_platform_probe,
 393         .remove = __devexit_p(tegra_pcm_platform_remove),
 394 };
 395
 396 static int __init snd_tegra_pcm_init(void)
 397 {
 398         return platform_driver_register(&tegra_pcm_driver);
 399 }
 400 module_init(snd_tegra_pcm_init);
 401
 402 static void __exit snd_tegra_pcm_exit(void)
 403 {
 404         platform_driver_unregister(&tegra_pcm_driver);
 405 }
 406 module_exit(snd_tegra_pcm_exit);
 407
 408 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 409 MODULE_DESCRIPTION("Tegra PCM ASoC driver");
 410 MODULE_LICENSE("GPL");
 411 MODULE_ALIAS("platform:" DRV_NAME);