sound/soc/ep93xx/ep93xx-pcm.c

   1 /*
   2  * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
   3  *
   4  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   5  * Copyright (C) 2006 Applied Data Systems
   6  *
   7  * Rewritten for the SoC audio subsystem (Based on PXA2xx code):
   8  *   Copyright (c) 2008 Ryan Mallon
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/device.h>
  18 #include <linux/slab.h>
  19 #include <linux/dmaengine.h>
  20 #include <linux/dma-mapping.h>
  21
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26
  27 #include <mach/dma.h>
  28 #include <mach/hardware.h>
  29 #include <mach/ep93xx-regs.h>
  30
  31 #include "ep93xx-pcm.h"
  32
  33 static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
  34         .info                   = (SNDRV_PCM_INFO_MMAP          |
  35                                    SNDRV_PCM_INFO_MMAP_VALID    |
  36                                    SNDRV_PCM_INFO_INTERLEAVED   |
  37                                    SNDRV_PCM_INFO_BLOCK_TRANSFER),
  38
  39         .rates                  = SNDRV_PCM_RATE_8000_192000,
  40         .rate_min               = SNDRV_PCM_RATE_8000,
  41         .rate_max               = SNDRV_PCM_RATE_192000,
  42
  43         .formats                = (SNDRV_PCM_FMTBIT_S16_LE |
  44                                    SNDRV_PCM_FMTBIT_S24_LE |
  45                                    SNDRV_PCM_FMTBIT_S32_LE),
  46
  47         .buffer_bytes_max       = 131072,
  48         .period_bytes_min       = 32,
  49         .period_bytes_max       = 32768,
  50         .periods_min            = 1,
  51         .periods_max            = 32,
  52         .fifo_size              = 32,
  53 };
  54
  55 struct ep93xx_runtime_data
  56 {
  57         int                             pointer_bytes;
  58         int                             periods;
  59         int                             period_bytes;
  60         struct dma_chan                 *dma_chan;
  61         struct ep93xx_dma_data          dma_data;
  62 };
  63
  64 static void ep93xx_pcm_dma_callback(void *data)
  65 {
  66         struct snd_pcm_substream *substream = data;
  67         struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
  68
  69         rtd->pointer_bytes += rtd->period_bytes;
  70         rtd->pointer_bytes %= rtd->period_bytes * rtd->periods;
  71
  72         snd_pcm_period_elapsed(substream);
  73 }
  74
  75 static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
  76 {
  77         struct ep93xx_dma_data *data = filter_param;
  78
  79         if (data->direction == ep93xx_dma_chan_direction(chan)) {
  80                 chan->private = data;
  81                 return true;
  82         }
  83
  84         return false;
  85 }
  86
  87 static int ep93xx_pcm_open(struct snd_pcm_substream *substream)
  88 {
  89         struct snd_soc_pcm_runtime *soc_rtd = substream->private_data;
  90         struct snd_soc_dai *cpu_dai = soc_rtd->cpu_dai;
  91         struct ep93xx_pcm_dma_params *dma_params;
  92         struct ep93xx_runtime_data *rtd;
  93         dma_cap_mask_t mask;
  94         int ret;
  95
  96         ret = snd_pcm_hw_constraint_integer(substream->runtime,
  97                                             SNDRV_PCM_HW_PARAM_PERIODS);
  98         if (ret < 0)
  99                 return ret;
 100
 101         snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware);
 102
 103         rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
 104         if (!rtd)
 105                 return -ENOMEM;
 106
 107         dma_cap_zero(mask);
 108         dma_cap_set(DMA_SLAVE, mask);
 109         dma_cap_set(DMA_CYCLIC, mask);
 110
 111         dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream);
 112         rtd->dma_data.port = dma_params->dma_port;
 113         rtd->dma_data.name = dma_params->name;
 114
 115         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 116                 rtd->dma_data.direction = DMA_TO_DEVICE;
 117         else
 118                 rtd->dma_data.direction = DMA_FROM_DEVICE;
 119
 120         rtd->dma_chan = dma_request_channel(mask, ep93xx_pcm_dma_filter,
 121                                             &rtd->dma_data);
 122         if (!rtd->dma_chan) {
 123                 kfree(rtd);
 124                 return -EINVAL;
 125         }
 126
 127         substream->runtime->private_data = rtd;
 128         return 0;
 129 }
 130
 131 static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
 132 {
 133         struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
 134
 135         dma_release_channel(rtd->dma_chan);
 136         kfree(rtd);
 137         return 0;
 138 }
 139
 140 static int ep93xx_pcm_dma_submit(struct snd_pcm_substream *substream)
 141 {
 142         struct snd_pcm_runtime *runtime = substream->runtime;
 143         struct ep93xx_runtime_data *rtd = runtime->private_data;
 144         struct dma_chan *chan = rtd->dma_chan;
 145         struct dma_device *dma_dev = chan->device;
 146         struct dma_async_tx_descriptor *desc;
 147
 148         rtd->pointer_bytes = 0;
 149         desc = dma_dev->device_prep_dma_cyclic(chan, runtime->dma_addr,
 150                                                rtd->period_bytes * rtd->periods,
 151                                                rtd->period_bytes,
 152                                                rtd->dma_data.direction);
 153         if (!desc)
 154                 return -EINVAL;
 155
 156         desc->callback = ep93xx_pcm_dma_callback;
 157         desc->callback_param = substream;
 158
 159         dmaengine_submit(desc);
 160         return 0;
 161 }
 162
 163 static void ep93xx_pcm_dma_flush(struct snd_pcm_substream *substream)
 164 {
 165         struct snd_pcm_runtime *runtime = substream->runtime;
 166         struct ep93xx_runtime_data *rtd = runtime->private_data;
 167
 168         dmaengine_terminate_all(rtd->dma_chan);
 169 }
 170
 171 static int ep93xx_pcm_hw_params(struct snd_pcm_substream *substream,
 172                                 struct snd_pcm_hw_params *params)
 173 {
 174         struct snd_pcm_runtime *runtime = substream->runtime;
 175         struct ep93xx_runtime_data *rtd = runtime->private_data;
 176
 177         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 178
 179         rtd->periods = params_periods(params);
 180         rtd->period_bytes = params_period_bytes(params);
 181         return 0;
 182 }
 183
 184 static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream)
 185 {
 186         snd_pcm_set_runtime_buffer(substream, NULL);
 187         return 0;
 188 }
 189
 190 static int ep93xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 191 {
 192         int ret;
 193
 194         ret = 0;
 195         switch (cmd) {
 196         case SNDRV_PCM_TRIGGER_START:
 197         case SNDRV_PCM_TRIGGER_RESUME:
 198         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 199                 ret = ep93xx_pcm_dma_submit(substream);
 200                 break;
 201
 202         case SNDRV_PCM_TRIGGER_STOP:
 203         case SNDRV_PCM_TRIGGER_SUSPEND:
 204         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 205                 ep93xx_pcm_dma_flush(substream);
 206                 break;
 207
 208         default:
 209                 ret = -EINVAL;
 210                 break;
 211         }
 212
 213         return ret;
 214 }
 215
 216 static snd_pcm_uframes_t ep93xx_pcm_pointer(struct snd_pcm_substream *substream)
 217 {
 218         struct snd_pcm_runtime *runtime = substream->runtime;
 219         struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
 220
 221         /* FIXME: implement this with sub-period granularity */
 222         return bytes_to_frames(runtime, rtd->pointer_bytes);
 223 }
 224
 225 static int ep93xx_pcm_mmap(struct snd_pcm_substream *substream,
 226                            struct vm_area_struct *vma)
 227 {
 228         struct snd_pcm_runtime *runtime = substream->runtime;
 229
 230         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 231                                      runtime->dma_area,
 232                                      runtime->dma_addr,
 233                                      runtime->dma_bytes);
 234 }
 235
 236 static struct snd_pcm_ops ep93xx_pcm_ops = {
 237         .open           = ep93xx_pcm_open,
 238         .close          = ep93xx_pcm_close,
 239         .ioctl          = snd_pcm_lib_ioctl,
 240         .hw_params      = ep93xx_pcm_hw_params,
 241         .hw_free        = ep93xx_pcm_hw_free,
 242         .trigger        = ep93xx_pcm_trigger,
 243         .pointer        = ep93xx_pcm_pointer,
 244         .mmap           = ep93xx_pcm_mmap,
 245 };
 246
 247 static int ep93xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 248 {
 249         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 250         struct snd_dma_buffer *buf = &substream->dma_buffer;
 251         size_t size = ep93xx_pcm_hardware.buffer_bytes_max;
 252
 253         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 254         buf->dev.dev = pcm->card->dev;
 255         buf->private_data = NULL;
 256         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 257                                            &buf->addr, GFP_KERNEL);
 258         buf->bytes = size;
 259
 260         return (buf->area == NULL) ? -ENOMEM : 0;
 261 }
 262
 263 static void ep93xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 264 {
 265         struct snd_pcm_substream *substream;
 266         struct snd_dma_buffer *buf;
 267         int stream;
 268
 269         for (stream = 0; stream < 2; stream++) {
 270                 substream = pcm->streams[stream].substream;
 271                 if (!substream)
 272                         continue;
 273
 274                 buf = &substream->dma_buffer;
 275                 if (!buf->area)
 276                         continue;
 277
 278                 dma_free_writecombine(pcm->card->dev, buf->bytes, buf->area,
 279                                       buf->addr);
 280                 buf->area = NULL;
 281         }
 282 }
 283
 284 static u64 ep93xx_pcm_dmamask = 0xffffffff;
 285
 286 static int ep93xx_pcm_new(struct snd_soc_pcm_runtime *rtd)
 287 {
 288         struct snd_card *card = rtd->card->snd_card;
 289         struct snd_soc_dai *dai = rtd->cpu_dai;
 290         struct snd_pcm *pcm = rtd->pcm;
 291         int ret = 0;
 292
 293         if (!card->dev->dma_mask)
 294                 card->dev->dma_mask = &ep93xx_pcm_dmamask;
 295         if (!card->dev->coherent_dma_mask)
 296                 card->dev->coherent_dma_mask = 0xffffffff;
 297
 298         if (dai->driver->playback.channels_min) {
 299                 ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
 300                                         SNDRV_PCM_STREAM_PLAYBACK);
 301                 if (ret)
 302                         return ret;
 303         }
 304
 305         if (dai->driver->capture.channels_min) {
 306                 ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
 307                                         SNDRV_PCM_STREAM_CAPTURE);
 308                 if (ret)
 309                         return ret;
 310         }
 311
 312         return 0;
 313 }
 314
 315 static struct snd_soc_platform_driver ep93xx_soc_platform = {
 316         .ops            = &ep93xx_pcm_ops,
 317         .pcm_new        = &ep93xx_pcm_new,
 318         .pcm_free       = &ep93xx_pcm_free_dma_buffers,
 319 };
 320
 321 static int __devinit ep93xx_soc_platform_probe(struct platform_device *pdev)
 322 {
 323         return snd_soc_register_platform(&pdev->dev, &ep93xx_soc_platform);
 324 }
 325
 326 static int __devexit ep93xx_soc_platform_remove(struct platform_device *pdev)
 327 {
 328         snd_soc_unregister_platform(&pdev->dev);
 329         return 0;
 330 }
 331
 332 static struct platform_driver ep93xx_pcm_driver = {
 333         .driver = {
 334                         .name = "ep93xx-pcm-audio",
 335                         .owner = THIS_MODULE,
 336         },
 337
 338         .probe = ep93xx_soc_platform_probe,
 339         .remove = __devexit_p(ep93xx_soc_platform_remove),
 340 };
 341
 342 static int __init ep93xx_soc_platform_init(void)
 343 {
 344         return platform_driver_register(&ep93xx_pcm_driver);
 345 }
 346
 347 static void __exit ep93xx_soc_platform_exit(void)
 348 {
 349         platform_driver_unregister(&ep93xx_pcm_driver);
 350 }
 351
 352 module_init(ep93xx_soc_platform_init);
 353 module_exit(ep93xx_soc_platform_exit);
 354
 355 MODULE_AUTHOR("Ryan Mallon");
 356 MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
 357 MODULE_LICENSE("GPL");