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) 2010,2012 - 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 static const struct snd_pcm_hardware tegra_pcm_hardware = {
  43         .info                   = SNDRV_PCM_INFO_MMAP |
  44                                   SNDRV_PCM_INFO_MMAP_VALID |
  45                                   SNDRV_PCM_INFO_PAUSE |
  46                                   SNDRV_PCM_INFO_RESUME |
  47                                   SNDRV_PCM_INFO_INTERLEAVED,
  48         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
  49         .channels_min           = 2,
  50         .channels_max           = 2,
  51         .period_bytes_min       = 1024,
  52         .period_bytes_max       = PAGE_SIZE,
  53         .periods_min            = 2,
  54         .periods_max            = 8,
  55         .buffer_bytes_max       = PAGE_SIZE * 8,
  56         .fifo_size              = 4,
  57 };
  58
  59 static void tegra_pcm_queue_dma(struct tegra_runtime_data *prtd)
  60 {
  61         struct snd_pcm_substream *substream = prtd->substream;
  62         struct snd_dma_buffer *buf = &substream->dma_buffer;
  63         struct tegra_dma_req *dma_req;
  64         unsigned long addr;
  65
  66         dma_req = &prtd->dma_req[prtd->dma_req_idx];
  67         prtd->dma_req_idx = 1 - prtd->dma_req_idx;
  68
  69         addr = buf->addr + prtd->dma_pos;
  70         prtd->dma_pos += dma_req->size;
  71         if (prtd->dma_pos >= prtd->dma_pos_end)
  72                 prtd->dma_pos = 0;
  73
  74         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  75                 dma_req->source_addr = addr;
  76         else
  77                 dma_req->dest_addr = addr;
  78
  79         tegra_dma_enqueue_req(prtd->dma_chan, dma_req);
  80 }
  81
  82 static void dma_complete_callback(struct tegra_dma_req *req)
  83 {
  84         struct tegra_runtime_data *prtd = (struct tegra_runtime_data *)req->dev;
  85         struct snd_pcm_substream *substream = prtd->substream;
  86         struct snd_pcm_runtime *runtime = substream->runtime;
  87
  88         spin_lock(&prtd->lock);
  89
  90         if (!prtd->running) {
  91                 spin_unlock(&prtd->lock);
  92                 return;
  93         }
  94
  95         if (++prtd->period_index >= runtime->periods)
  96                 prtd->period_index = 0;
  97
  98         tegra_pcm_queue_dma(prtd);
  99
 100         spin_unlock(&prtd->lock);
 101
 102         snd_pcm_period_elapsed(substream);
 103 }
 104
 105 static void setup_dma_tx_request(struct tegra_dma_req *req,
 106                                         struct tegra_pcm_dma_params * dmap)
 107 {
 108         req->complete = dma_complete_callback;
 109         req->to_memory = false;
 110         req->dest_addr = dmap->addr;
 111         req->dest_wrap = dmap->wrap;
 112         req->source_bus_width = 32;
 113         req->source_wrap = 0;
 114         req->dest_bus_width = dmap->width;
 115         req->req_sel = dmap->req_sel;
 116 }
 117
 118 static void setup_dma_rx_request(struct tegra_dma_req *req,
 119                                         struct tegra_pcm_dma_params * dmap)
 120 {
 121         req->complete = dma_complete_callback;
 122         req->to_memory = true;
 123         req->source_addr = dmap->addr;
 124         req->dest_wrap = 0;
 125         req->source_bus_width = dmap->width;
 126         req->source_wrap = dmap->wrap;
 127         req->dest_bus_width = 32;
 128         req->req_sel = dmap->req_sel;
 129 }
 130
 131 static int tegra_pcm_open(struct snd_pcm_substream *substream)
 132 {
 133         struct snd_pcm_runtime *runtime = substream->runtime;
 134         struct tegra_runtime_data *prtd;
 135         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 136         struct tegra_pcm_dma_params * dmap;
 137         int ret = 0;
 138
 139         prtd = kzalloc(sizeof(struct tegra_runtime_data), GFP_KERNEL);
 140         if (prtd == NULL)
 141                 return -ENOMEM;
 142
 143         runtime->private_data = prtd;
 144         prtd->substream = substream;
 145
 146         spin_lock_init(&prtd->lock);
 147
 148         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 149                 dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 150                 setup_dma_tx_request(&prtd->dma_req[0], dmap);
 151                 setup_dma_tx_request(&prtd->dma_req[1], dmap);
 152         } else {
 153                 dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 154                 setup_dma_rx_request(&prtd->dma_req[0], dmap);
 155                 setup_dma_rx_request(&prtd->dma_req[1], dmap);
 156         }
 157
 158         prtd->dma_req[0].dev = prtd;
 159         prtd->dma_req[1].dev = prtd;
 160
 161         prtd->dma_chan = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT);
 162         if (prtd->dma_chan == NULL) {
 163                 ret = -ENOMEM;
 164                 goto err;
 165         }
 166
 167         /* Set HW params now that initialization is complete */
 168         snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
 169
 170         /* Ensure that buffer size is a multiple of period size */
 171         ret = snd_pcm_hw_constraint_integer(runtime,
 172                                                 SNDRV_PCM_HW_PARAM_PERIODS);
 173         if (ret < 0)
 174                 goto err;
 175
 176         return 0;
 177
 178 err:
 179         if (prtd->dma_chan) {
 180                 tegra_dma_free_channel(prtd->dma_chan);
 181         }
 182
 183         kfree(prtd);
 184
 185         return ret;
 186 }
 187
 188 static int tegra_pcm_close(struct snd_pcm_substream *substream)
 189 {
 190         struct snd_pcm_runtime *runtime = substream->runtime;
 191         struct tegra_runtime_data *prtd = runtime->private_data;
 192
 193         tegra_dma_free_channel(prtd->dma_chan);
 194
 195         kfree(prtd);
 196
 197         return 0;
 198 }
 199
 200 static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
 201                                 struct snd_pcm_hw_params *params)
 202 {
 203         struct snd_pcm_runtime *runtime = substream->runtime;
 204         struct tegra_runtime_data *prtd = runtime->private_data;
 205
 206         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 207
 208         prtd->dma_req[0].size = params_period_bytes(params);
 209         prtd->dma_req[1].size = prtd->dma_req[0].size;
 210
 211         return 0;
 212 }
 213
 214 static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
 215 {
 216         snd_pcm_set_runtime_buffer(substream, NULL);
 217
 218         return 0;
 219 }
 220
 221 static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 222 {
 223         struct snd_pcm_runtime *runtime = substream->runtime;
 224         struct tegra_runtime_data *prtd = runtime->private_data;
 225         unsigned long flags;
 226
 227         switch (cmd) {
 228         case SNDRV_PCM_TRIGGER_START:
 229                 prtd->dma_pos = 0;
 230                 prtd->dma_pos_end = frames_to_bytes(runtime, runtime->periods * runtime->period_size);
 231                 prtd->period_index = 0;
 232                 prtd->dma_req_idx = 0;
 233                 /* Fall-through */
 234         case SNDRV_PCM_TRIGGER_RESUME:
 235         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 236                 spin_lock_irqsave(&prtd->lock, flags);
 237                 prtd->running = 1;
 238                 spin_unlock_irqrestore(&prtd->lock, flags);
 239                 tegra_pcm_queue_dma(prtd);
 240                 tegra_pcm_queue_dma(prtd);
 241                 break;
 242         case SNDRV_PCM_TRIGGER_STOP:
 243         case SNDRV_PCM_TRIGGER_SUSPEND:
 244         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 245                 spin_lock_irqsave(&prtd->lock, flags);
 246                 prtd->running = 0;
 247                 spin_unlock_irqrestore(&prtd->lock, flags);
 248                 tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[0]);
 249                 tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[1]);
 250                 break;
 251         default:
 252                 return -EINVAL;
 253         }
 254
 255         return 0;
 256 }
 257
 258 static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
 259 {
 260         struct snd_pcm_runtime *runtime = substream->runtime;
 261         struct tegra_runtime_data *prtd = runtime->private_data;
 262
 263         return prtd->period_index * runtime->period_size;
 264 }
 265
 266
 267 static int tegra_pcm_mmap(struct snd_pcm_substream *substream,
 268                                 struct vm_area_struct *vma)
 269 {
 270         struct snd_pcm_runtime *runtime = substream->runtime;
 271
 272         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 273                                         runtime->dma_area,
 274                                         runtime->dma_addr,
 275                                         runtime->dma_bytes);
 276 }
 277
 278 static struct snd_pcm_ops tegra_pcm_ops = {
 279         .open           = tegra_pcm_open,
 280         .close          = tegra_pcm_close,
 281         .ioctl          = snd_pcm_lib_ioctl,
 282         .hw_params      = tegra_pcm_hw_params,
 283         .hw_free        = tegra_pcm_hw_free,
 284         .trigger        = tegra_pcm_trigger,
 285         .pointer        = tegra_pcm_pointer,
 286         .mmap           = tegra_pcm_mmap,
 287 };
 288
 289 static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 290 {
 291         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 292         struct snd_dma_buffer *buf = &substream->dma_buffer;
 293         size_t size = tegra_pcm_hardware.buffer_bytes_max;
 294
 295         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 296                                                 &buf->addr, GFP_KERNEL);
 297         if (!buf->area)
 298                 return -ENOMEM;
 299
 300         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 301         buf->dev.dev = pcm->card->dev;
 302         buf->private_data = NULL;
 303         buf->bytes = size;
 304
 305         return 0;
 306 }
 307
 308 static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 309 {
 310         struct snd_pcm_substream *substream;
 311         struct snd_dma_buffer *buf;
 312
 313         substream = pcm->streams[stream].substream;
 314         if (!substream)
 315                 return;
 316
 317         buf = &substream->dma_buffer;
 318         if (!buf->area)
 319                 return;
 320
 321         dma_free_writecombine(pcm->card->dev, buf->bytes,
 322                                 buf->area, buf->addr);
 323         buf->area = NULL;
 324 }
 325
 326 static u64 tegra_dma_mask = DMA_BIT_MASK(32);
 327
 328 static int tegra_pcm_new(struct snd_soc_pcm_runtime *rtd)
 329 {
 330         struct snd_card *card = rtd->card->snd_card;
 331         struct snd_pcm *pcm = rtd->pcm;
 332         int ret = 0;
 333
 334         if (!card->dev->dma_mask)
 335                 card->dev->dma_mask = &tegra_dma_mask;
 336         if (!card->dev->coherent_dma_mask)
 337                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 338
 339         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 340                 ret = tegra_pcm_preallocate_dma_buffer(pcm,
 341                                                 SNDRV_PCM_STREAM_PLAYBACK);
 342                 if (ret)
 343                         goto err;
 344         }
 345
 346         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 347                 ret = tegra_pcm_preallocate_dma_buffer(pcm,
 348                                                 SNDRV_PCM_STREAM_CAPTURE);
 349                 if (ret)
 350                         goto err_free_play;
 351         }
 352
 353         return 0;
 354
 355 err_free_play:
 356         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
 357 err:
 358         return ret;
 359 }
 360
 361 static void tegra_pcm_free(struct snd_pcm *pcm)
 362 {
 363         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
 364         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
 365 }
 366
 367 static struct snd_soc_platform_driver tegra_pcm_platform = {
 368         .ops            = &tegra_pcm_ops,
 369         .pcm_new        = tegra_pcm_new,
 370         .pcm_free       = tegra_pcm_free,
 371 };
 372
 373 int __devinit tegra_pcm_platform_register(struct device *dev)
 374 {
 375         return snd_soc_register_platform(dev, &tegra_pcm_platform);
 376 }
 377 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
 378
 379 void __devexit tegra_pcm_platform_unregister(struct device *dev)
 380 {
 381         snd_soc_unregister_platform(dev);
 382 }
 383 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
 384
 385 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 386 MODULE_DESCRIPTION("Tegra PCM ASoC driver");
 387 MODULE_LICENSE("GPL");