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 devm_tegra_pcm_platform_register(struct device *dev)
  52 {
  53         return devm_snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
  54 }
  55 EXPORT_SYMBOL_GPL(devm_tegra_pcm_platform_register);
  56
  57 int tegra_pcm_platform_register_with_chan_names(struct device *dev,
  58                                 struct snd_dmaengine_pcm_config *config,
  59                                 char *txdmachan, char *rxdmachan)
  60 {
  61         *config = tegra_dmaengine_pcm_config;
  62         config->dma_dev = dev->parent;
  63         config->chan_names[0] = txdmachan;
  64         config->chan_names[1] = rxdmachan;
  65
  66         return snd_dmaengine_pcm_register(dev, config, 0);
  67 }
  68 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
  69
  70 void tegra_pcm_platform_unregister(struct device *dev)
  71 {
  72         return snd_dmaengine_pcm_unregister(dev);
  73 }
  74 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
  75
  76 int tegra_pcm_open(struct snd_soc_component *component,
  77                    struct snd_pcm_substream *substream)
  78 {
  79         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
  80         struct snd_dmaengine_dai_dma_data *dmap;
  81         struct dma_chan *chan;
  82         struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
  83         int ret;
  84
  85         if (rtd->dai_link->no_pcm)
  86                 return 0;
  87
  88         dmap = snd_soc_dai_get_dma_data(cpu_dai, substream);
  89
  90         /* Set HW params now that initialization is complete */
  91         snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
  92
  93         /* Ensure period size is multiple of 8 */
  94         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
  95                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8);
  96         if (ret) {
  97                 dev_err(rtd->dev, "failed to set constraint %d\n", ret);
  98                 return ret;
  99         }
 100
 101         chan = dma_request_chan(cpu_dai->dev, dmap->chan_name);
 102         if (IS_ERR(chan)) {
 103                 dev_err(cpu_dai->dev,
 104                         "dmaengine request slave channel failed! (%s)\n",
 105                         dmap->chan_name);
 106                 return -ENODEV;
 107         }
 108
 109         ret = snd_dmaengine_pcm_open(substream, chan);
 110         if (ret) {
 111                 dev_err(rtd->dev,
 112                         "dmaengine pcm open failed with err %d (%s)\n", ret,
 113                         dmap->chan_name);
 114
 115                 dma_release_channel(chan);
 116
 117                 return ret;
 118         }
 119
 120         /* Set wait time to 500ms by default */
 121         substream->wait_time = 500;
 122
 123         return 0;
 124 }
 125 EXPORT_SYMBOL_GPL(tegra_pcm_open);
 126
 127 int tegra_pcm_close(struct snd_soc_component *component,
 128                     struct snd_pcm_substream *substream)
 129 {
 130         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 131
 132         if (rtd->dai_link->no_pcm)
 133                 return 0;
 134
 135         snd_dmaengine_pcm_close_release_chan(substream);
 136
 137         return 0;
 138 }
 139 EXPORT_SYMBOL_GPL(tegra_pcm_close);
 140
 141 int tegra_pcm_hw_params(struct snd_soc_component *component,
 142                         struct snd_pcm_substream *substream,
 143                         struct snd_pcm_hw_params *params)
 144 {
 145         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 146         struct snd_dmaengine_dai_dma_data *dmap;
 147         struct dma_slave_config slave_config;
 148         struct dma_chan *chan;
 149         int ret;
 150
 151         if (rtd->dai_link->no_pcm)
 152                 return 0;
 153
 154         dmap = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
 155         if (!dmap)
 156                 return 0;
 157
 158         chan = snd_dmaengine_pcm_get_chan(substream);
 159
 160         ret = snd_hwparams_to_dma_slave_config(substream, params,
 161                                                &slave_config);
 162         if (ret) {
 163                 dev_err(rtd->dev, "hw params config failed with err %d\n", ret);
 164                 return ret;
 165         }
 166
 167         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 168                 slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 169                 slave_config.dst_addr = dmap->addr;
 170                 slave_config.dst_maxburst = 8;
 171         } else {
 172                 slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 173                 slave_config.src_addr = dmap->addr;
 174                 slave_config.src_maxburst = 8;
 175         }
 176
 177         ret = dmaengine_slave_config(chan, &slave_config);
 178         if (ret < 0) {
 179                 dev_err(rtd->dev, "dma slave config failed with err %d\n", ret);
 180                 return ret;
 181         }
 182
 183         return 0;
 184 }
 185 EXPORT_SYMBOL_GPL(tegra_pcm_hw_params);
 186
 187 snd_pcm_uframes_t tegra_pcm_pointer(struct snd_soc_component *component,
 188                                     struct snd_pcm_substream *substream)
 189 {
 190         return snd_dmaengine_pcm_pointer(substream);
 191 }
 192 EXPORT_SYMBOL_GPL(tegra_pcm_pointer);
 193
 194 static int tegra_pcm_dma_allocate(struct device *dev, struct snd_soc_pcm_runtime *rtd,
 195                                   size_t size)
 196 {
 197         struct snd_pcm *pcm = rtd->pcm;
 198         int ret;
 199
 200         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 201         if (ret < 0)
 202                 return ret;
 203
 204         return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC, dev, size);
 205 }
 206
 207 int tegra_pcm_construct(struct snd_soc_component *component,
 208                         struct snd_soc_pcm_runtime *rtd)
 209 {
 210         struct device *dev = component->dev;
 211
 212         /*
 213          * Fallback for backwards-compatibility with older device trees that
 214          * have the iommus property in the virtual, top-level "sound" node.
 215          */
 216         if (!of_property_present(dev->of_node, "iommus"))
 217                 dev = rtd->card->snd_card->dev;
 218
 219         return tegra_pcm_dma_allocate(dev, rtd, tegra_pcm_hardware.buffer_bytes_max);
 220 }
 221 EXPORT_SYMBOL_GPL(tegra_pcm_construct);
 222
 223 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 224 MODULE_DESCRIPTION("Tegra PCM ASoC driver");
 225 MODULE_LICENSE("GPL");