sound/soc/tegra/tegra_pcm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * tegra_pcm.c - Tegra PCM driver
   4  *
   5  * Author: Stephen Warren <swarren@nvidia.com>
   6  * Copyright (C) 2010,2012 - NVIDIA, Inc.
   7  *
   8  * Based on code copyright/by:
   9  *
  10  * Copyright (c) 2009-2010, NVIDIA Corporation.
  11  * Scott Peterson <speterson@nvidia.com>
  12  * Vijay Mali <vmali@nvidia.com>
  13  *
  14  * Copyright (C) 2010 Google, Inc.
  15  * Iliyan Malchev <malchev@google.com>
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/dma-mapping.h>
  20 #include <sound/core.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/soc.h>
  24 #include <sound/dmaengine_pcm.h>
  25 #include "tegra_pcm.h"
  26
  27 static const struct snd_pcm_hardware tegra_pcm_hardware = {
  28         .info                   = SNDRV_PCM_INFO_MMAP |
  29                                   SNDRV_PCM_INFO_MMAP_VALID |
  30                                   SNDRV_PCM_INFO_INTERLEAVED,
  31         .period_bytes_min       = 1024,
  32         .period_bytes_max       = PAGE_SIZE,
  33         .periods_min            = 2,
  34         .periods_max            = 8,
  35         .buffer_bytes_max       = PAGE_SIZE * 8,
  36         .fifo_size              = 4,
  37 };
  38
  39 static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
  40         .pcm_hardware = &tegra_pcm_hardware,
  41         .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
  42         .prealloc_buffer_size = PAGE_SIZE * 8,
  43 };
  44
  45 int tegra_pcm_platform_register(struct device *dev)
  46 {
  47         return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
  48 }
  49 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
  50
  51 int tegra_pcm_platform_register_with_chan_names(struct device *dev,
  52                                 struct snd_dmaengine_pcm_config *config,
  53                                 char *txdmachan, char *rxdmachan)
  54 {
  55         *config = tegra_dmaengine_pcm_config;
  56         config->dma_dev = dev->parent;
  57         config->chan_names[0] = txdmachan;
  58         config->chan_names[1] = rxdmachan;
  59
  60         return snd_dmaengine_pcm_register(dev, config, 0);
  61 }
  62 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
  63
  64 void tegra_pcm_platform_unregister(struct device *dev)
  65 {
  66         return snd_dmaengine_pcm_unregister(dev);
  67 }
  68 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
  69
  70 int tegra_pcm_open(struct snd_soc_component *component,
  71                    struct snd_pcm_substream *substream)
  72 {
  73         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  74         struct snd_dmaengine_dai_dma_data *dmap;
  75         struct dma_chan *chan;
  76         struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
  77         int ret;
  78
  79         if (rtd->dai_link->no_pcm)
  80                 return 0;
  81
  82         dmap = snd_soc_dai_get_dma_data(cpu_dai, substream);
  83
  84         /* Set HW params now that initialization is complete */
  85         snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
  86
  87         /* Ensure period size is multiple of 8 */
  88         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
  89                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8);
  90         if (ret) {
  91                 dev_err(rtd->dev, "failed to set constraint %d\n", ret);
  92                 return ret;
  93         }
  94
  95         chan = dma_request_slave_channel(cpu_dai->dev, dmap->chan_name);
  96         if (!chan) {
  97                 dev_err(cpu_dai->dev,
  98                         "dmaengine request slave channel failed! (%s)\n",
  99                         dmap->chan_name);
 100                 return -ENODEV;
 101         }
 102
 103         ret = snd_dmaengine_pcm_open(substream, chan);
 104         if (ret) {
 105                 dev_err(rtd->dev,
 106                         "dmaengine pcm open failed with err %d (%s)\n", ret,
 107                         dmap->chan_name);
 108
 109                 dma_release_channel(chan);
 110
 111                 return ret;
 112         }
 113
 114         return 0;
 115 }
 116 EXPORT_SYMBOL_GPL(tegra_pcm_open);
 117
 118 int tegra_pcm_close(struct snd_soc_component *component,
 119                     struct snd_pcm_substream *substream)
 120 {
 121         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 122
 123         if (rtd->dai_link->no_pcm)
 124                 return 0;
 125
 126         snd_dmaengine_pcm_close_release_chan(substream);
 127
 128         return 0;
 129 }
 130 EXPORT_SYMBOL_GPL(tegra_pcm_close);
 131
 132 int tegra_pcm_hw_params(struct snd_soc_component *component,
 133                         struct snd_pcm_substream *substream,
 134                         struct snd_pcm_hw_params *params)
 135 {
 136         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 137         struct snd_dmaengine_dai_dma_data *dmap;
 138         struct dma_slave_config slave_config;
 139         struct dma_chan *chan;
 140         int ret;
 141
 142         if (rtd->dai_link->no_pcm)
 143                 return 0;
 144
 145         dmap = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
 146         if (!dmap)
 147                 return 0;
 148
 149         chan = snd_dmaengine_pcm_get_chan(substream);
 150
 151         ret = snd_hwparams_to_dma_slave_config(substream, params,
 152                                                &slave_config);
 153         if (ret) {
 154                 dev_err(rtd->dev, "hw params config failed with err %d\n", ret);
 155                 return ret;
 156         }
 157
 158         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 159                 slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 160                 slave_config.dst_addr = dmap->addr;
 161                 slave_config.dst_maxburst = 8;
 162         } else {
 163                 slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 164                 slave_config.src_addr = dmap->addr;
 165                 slave_config.src_maxburst = 8;
 166         }
 167
 168         ret = dmaengine_slave_config(chan, &slave_config);
 169         if (ret < 0) {
 170                 dev_err(rtd->dev, "dma slave config failed with err %d\n", ret);
 171                 return ret;
 172         }
 173
 174         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 175
 176         return 0;
 177 }
 178 EXPORT_SYMBOL_GPL(tegra_pcm_hw_params);
 179
 180 int tegra_pcm_hw_free(struct snd_soc_component *component,
 181                       struct snd_pcm_substream *substream)
 182 {
 183         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 184
 185         if (rtd->dai_link->no_pcm)
 186                 return 0;
 187
 188         snd_pcm_set_runtime_buffer(substream, NULL);
 189
 190         return 0;
 191 }
 192 EXPORT_SYMBOL_GPL(tegra_pcm_hw_free);
 193
 194 int tegra_pcm_mmap(struct snd_soc_component *component,
 195                    struct snd_pcm_substream *substream,
 196                    struct vm_area_struct *vma)
 197 {
 198         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 199         struct snd_pcm_runtime *runtime = substream->runtime;
 200
 201         if (rtd->dai_link->no_pcm)
 202                 return 0;
 203
 204         return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
 205                            runtime->dma_addr, runtime->dma_bytes);
 206 }
 207 EXPORT_SYMBOL_GPL(tegra_pcm_mmap);
 208
 209 snd_pcm_uframes_t tegra_pcm_pointer(struct snd_soc_component *component,
 210                                     struct snd_pcm_substream *substream)
 211 {
 212         return snd_dmaengine_pcm_pointer(substream);
 213 }
 214 EXPORT_SYMBOL_GPL(tegra_pcm_pointer);
 215
 216 static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
 217                                             size_t size)
 218 {
 219         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 220         struct snd_dma_buffer *buf = &substream->dma_buffer;
 221
 222         buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
 223         if (!buf->area)
 224                 return -ENOMEM;
 225
 226         buf->private_data = NULL;
 227         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 228         buf->dev.dev = pcm->card->dev;
 229         buf->bytes = size;
 230
 231         return 0;
 232 }
 233
 234 static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 235 {
 236         struct snd_pcm_substream *substream;
 237         struct snd_dma_buffer *buf;
 238
 239         substream = pcm->streams[stream].substream;
 240         if (!substream)
 241                 return;
 242
 243         buf = &substream->dma_buffer;
 244         if (!buf->area)
 245                 return;
 246
 247         dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
 248         buf->area = NULL;
 249 }
 250
 251 static int tegra_pcm_dma_allocate(struct snd_soc_pcm_runtime *rtd,
 252                                   size_t size)
 253 {
 254         struct snd_card *card = rtd->card->snd_card;
 255         struct snd_pcm *pcm = rtd->pcm;
 256         int ret;
 257
 258         ret = dma_set_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 259         if (ret < 0)
 260                 return ret;
 261
 262         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 263                 ret = tegra_pcm_preallocate_dma_buffer(pcm,
 264                         SNDRV_PCM_STREAM_PLAYBACK, size);
 265                 if (ret)
 266                         goto err;
 267         }
 268
 269         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 270                 ret = tegra_pcm_preallocate_dma_buffer(pcm,
 271                         SNDRV_PCM_STREAM_CAPTURE, size);
 272                 if (ret)
 273                         goto err_free_play;
 274         }
 275
 276         return 0;
 277
 278 err_free_play:
 279         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
 280 err:
 281         return ret;
 282 }
 283
 284 int tegra_pcm_construct(struct snd_soc_component *component,
 285                         struct snd_soc_pcm_runtime *rtd)
 286 {
 287         return tegra_pcm_dma_allocate(rtd, tegra_pcm_hardware.buffer_bytes_max);
 288 }
 289 EXPORT_SYMBOL_GPL(tegra_pcm_construct);
 290
 291 void tegra_pcm_destruct(struct snd_soc_component *component,
 292                         struct snd_pcm *pcm)
 293 {
 294         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
 295         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
 296 }
 297 EXPORT_SYMBOL_GPL(tegra_pcm_destruct);
 298
 299 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 300 MODULE_DESCRIPTION("Tegra PCM ASoC driver");
 301 MODULE_LICENSE("GPL");