sound/soc/mxs/mxs-pcm.c

   1 /*
   2  * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
   3  *
   4  * Based on sound/soc/imx/imx-pcm-dma-mx2.c
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <linux/clk.h>
  22 #include <linux/delay.h>
  23 #include <linux/device.h>
  24 #include <linux/dma-mapping.h>
  25 #include <linux/init.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/module.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/slab.h>
  30 #include <linux/dmaengine.h>
  31
  32 #include <sound/core.h>
  33 #include <sound/initval.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/soc.h>
  37
  38 #include <mach/dma.h>
  39 #include "mxs-pcm.h"
  40
  41 static struct snd_pcm_hardware snd_mxs_hardware = {
  42         .info                   = SNDRV_PCM_INFO_MMAP |
  43                                   SNDRV_PCM_INFO_MMAP_VALID |
  44                                   SNDRV_PCM_INFO_PAUSE |
  45                                   SNDRV_PCM_INFO_RESUME |
  46                                   SNDRV_PCM_INFO_INTERLEAVED,
  47         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  48                                   SNDRV_PCM_FMTBIT_S20_3LE |
  49                                   SNDRV_PCM_FMTBIT_S24_LE,
  50         .channels_min           = 2,
  51         .channels_max           = 2,
  52         .period_bytes_min       = 32,
  53         .period_bytes_max       = 8192,
  54         .periods_min            = 1,
  55         .periods_max            = 52,
  56         .buffer_bytes_max       = 64 * 1024,
  57         .fifo_size              = 32,
  58
  59 };
  60
  61 static void audio_dma_irq(void *data)
  62 {
  63         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
  64         struct snd_pcm_runtime *runtime = substream->runtime;
  65         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
  66
  67         iprtd->offset += iprtd->period_bytes;
  68         iprtd->offset %= iprtd->period_bytes * iprtd->periods;
  69         snd_pcm_period_elapsed(substream);
  70 }
  71
  72 static bool filter(struct dma_chan *chan, void *param)
  73 {
  74         struct mxs_pcm_runtime_data *iprtd = param;
  75         struct mxs_pcm_dma_params *dma_params = iprtd->dma_params;
  76
  77         if (!mxs_dma_is_apbx(chan))
  78                 return false;
  79
  80         if (chan->chan_id != dma_params->chan_num)
  81                 return false;
  82
  83         chan->private = &iprtd->dma_data;
  84
  85         return true;
  86 }
  87
  88 static int mxs_dma_alloc(struct snd_pcm_substream *substream,
  89                                 struct snd_pcm_hw_params *params)
  90 {
  91         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  92         struct snd_pcm_runtime *runtime = substream->runtime;
  93         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
  94         dma_cap_mask_t mask;
  95
  96         iprtd->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  97
  98         dma_cap_zero(mask);
  99         dma_cap_set(DMA_SLAVE, mask);
 100         iprtd->dma_data.chan_irq = iprtd->dma_params->chan_irq;
 101         iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
 102         if (!iprtd->dma_chan)
 103                 return -EINVAL;
 104
 105         return 0;
 106 }
 107
 108 static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
 109                                 struct snd_pcm_hw_params *params)
 110 {
 111         struct snd_pcm_runtime *runtime = substream->runtime;
 112         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
 113         unsigned long dma_addr;
 114         struct dma_chan *chan;
 115         int ret;
 116
 117         ret = mxs_dma_alloc(substream, params);
 118         if (ret)
 119                 return ret;
 120         chan = iprtd->dma_chan;
 121
 122         iprtd->size = params_buffer_bytes(params);
 123         iprtd->periods = params_periods(params);
 124         iprtd->period_bytes = params_period_bytes(params);
 125         iprtd->offset = 0;
 126         iprtd->period_time = HZ / (params_rate(params) /
 127                         params_period_size(params));
 128
 129         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 130
 131         dma_addr = runtime->dma_addr;
 132
 133         iprtd->buf = substream->dma_buffer.area;
 134
 135         iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
 136                         iprtd->period_bytes * iprtd->periods,
 137                         iprtd->period_bytes,
 138                         substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 139                         DMA_TO_DEVICE : DMA_FROM_DEVICE);
 140         if (!iprtd->desc) {
 141                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
 142                 return -EINVAL;
 143         }
 144
 145         iprtd->desc->callback = audio_dma_irq;
 146         iprtd->desc->callback_param = substream;
 147
 148         return 0;
 149 }
 150
 151 static int snd_mxs_pcm_hw_free(struct snd_pcm_substream *substream)
 152 {
 153         struct snd_pcm_runtime *runtime = substream->runtime;
 154         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
 155
 156         if (iprtd->dma_chan) {
 157                 dma_release_channel(iprtd->dma_chan);
 158                 iprtd->dma_chan = NULL;
 159         }
 160
 161         return 0;
 162 }
 163
 164 static int snd_mxs_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 165 {
 166         struct snd_pcm_runtime *runtime = substream->runtime;
 167         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
 168
 169         switch (cmd) {
 170         case SNDRV_PCM_TRIGGER_START:
 171         case SNDRV_PCM_TRIGGER_RESUME:
 172         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 173                 dmaengine_submit(iprtd->desc);
 174
 175                 break;
 176         case SNDRV_PCM_TRIGGER_STOP:
 177         case SNDRV_PCM_TRIGGER_SUSPEND:
 178         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 179                 dmaengine_terminate_all(iprtd->dma_chan);
 180
 181                 break;
 182         default:
 183                 return -EINVAL;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static snd_pcm_uframes_t snd_mxs_pcm_pointer(
 190                 struct snd_pcm_substream *substream)
 191 {
 192         struct snd_pcm_runtime *runtime = substream->runtime;
 193         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
 194
 195         return bytes_to_frames(substream->runtime, iprtd->offset);
 196 }
 197
 198 static int snd_mxs_open(struct snd_pcm_substream *substream)
 199 {
 200         struct snd_pcm_runtime *runtime = substream->runtime;
 201         struct mxs_pcm_runtime_data *iprtd;
 202         int ret;
 203
 204         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 205         if (iprtd == NULL)
 206                 return -ENOMEM;
 207         runtime->private_data = iprtd;
 208
 209         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 210                         SNDRV_PCM_HW_PARAM_PERIODS);
 211         if (ret < 0) {
 212                 kfree(iprtd);
 213                 return ret;
 214         }
 215
 216         snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
 217
 218         return 0;
 219 }
 220
 221 static int snd_mxs_close(struct snd_pcm_substream *substream)
 222 {
 223         struct snd_pcm_runtime *runtime = substream->runtime;
 224         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
 225
 226         kfree(iprtd);
 227
 228         return 0;
 229 }
 230
 231 static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream,
 232                 struct vm_area_struct *vma)
 233 {
 234         struct snd_pcm_runtime *runtime = substream->runtime;
 235
 236         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 237                                         runtime->dma_area,
 238                                         runtime->dma_addr,
 239                                         runtime->dma_bytes);
 240 }
 241
 242 static struct snd_pcm_ops mxs_pcm_ops = {
 243         .open           = snd_mxs_open,
 244         .close          = snd_mxs_close,
 245         .ioctl          = snd_pcm_lib_ioctl,
 246         .hw_params      = snd_mxs_pcm_hw_params,
 247         .hw_free        = snd_mxs_pcm_hw_free,
 248         .trigger        = snd_mxs_pcm_trigger,
 249         .pointer        = snd_mxs_pcm_pointer,
 250         .mmap           = snd_mxs_pcm_mmap,
 251 };
 252
 253 static int mxs_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 254 {
 255         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 256         struct snd_dma_buffer *buf = &substream->dma_buffer;
 257         size_t size = snd_mxs_hardware.buffer_bytes_max;
 258
 259         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 260         buf->dev.dev = pcm->card->dev;
 261         buf->private_data = NULL;
 262         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 263                                            &buf->addr, GFP_KERNEL);
 264         if (!buf->area)
 265                 return -ENOMEM;
 266         buf->bytes = size;
 267
 268         return 0;
 269 }
 270
 271 static u64 mxs_pcm_dmamask = DMA_BIT_MASK(32);
 272 static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd)
 273 {
 274         struct snd_card *card = rtd->card->snd_card;
 275         struct snd_pcm *pcm = rtd->pcm;
 276         int ret = 0;
 277
 278         if (!card->dev->dma_mask)
 279                 card->dev->dma_mask = &mxs_pcm_dmamask;
 280         if (!card->dev->coherent_dma_mask)
 281                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 282
 283         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 284                 ret = mxs_pcm_preallocate_dma_buffer(pcm,
 285                         SNDRV_PCM_STREAM_PLAYBACK);
 286                 if (ret)
 287                         goto out;
 288         }
 289
 290         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 291                 ret = mxs_pcm_preallocate_dma_buffer(pcm,
 292                         SNDRV_PCM_STREAM_CAPTURE);
 293                 if (ret)
 294                         goto out;
 295         }
 296
 297 out:
 298         return ret;
 299 }
 300
 301 static void mxs_pcm_free(struct snd_pcm *pcm)
 302 {
 303         struct snd_pcm_substream *substream;
 304         struct snd_dma_buffer *buf;
 305         int stream;
 306
 307         for (stream = 0; stream < 2; stream++) {
 308                 substream = pcm->streams[stream].substream;
 309                 if (!substream)
 310                         continue;
 311
 312                 buf = &substream->dma_buffer;
 313                 if (!buf->area)
 314                         continue;
 315
 316                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 317                                       buf->area, buf->addr);
 318                 buf->area = NULL;
 319         }
 320 }
 321
 322 static struct snd_soc_platform_driver mxs_soc_platform = {
 323         .ops            = &mxs_pcm_ops,
 324         .pcm_new        = mxs_pcm_new,
 325         .pcm_free       = mxs_pcm_free,
 326 };
 327
 328 static int __devinit mxs_soc_platform_probe(struct platform_device *pdev)
 329 {
 330         return snd_soc_register_platform(&pdev->dev, &mxs_soc_platform);
 331 }
 332
 333 static int __devexit mxs_soc_platform_remove(struct platform_device *pdev)
 334 {
 335         snd_soc_unregister_platform(&pdev->dev);
 336
 337         return 0;
 338 }
 339
 340 static struct platform_driver mxs_pcm_driver = {
 341         .driver = {
 342                 .name = "mxs-pcm-audio",
 343                 .owner = THIS_MODULE,
 344         },
 345         .probe = mxs_soc_platform_probe,
 346         .remove = __devexit_p(mxs_soc_platform_remove),
 347 };
 348
 349 static int __init snd_mxs_pcm_init(void)
 350 {
 351         return platform_driver_register(&mxs_pcm_driver);
 352 }
 353 module_init(snd_mxs_pcm_init);
 354
 355 static void __exit snd_mxs_pcm_exit(void)
 356 {
 357         platform_driver_unregister(&mxs_pcm_driver);
 358 }
 359 module_exit(snd_mxs_pcm_exit);
 360
 361 MODULE_LICENSE("GPL");
 362 MODULE_ALIAS("platform:mxs-pcm-audio");