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         return 0;
 175 }
 176 EXPORT_SYMBOL_GPL(tegra_pcm_hw_params);
 177
 178 snd_pcm_uframes_t tegra_pcm_pointer(struct snd_soc_component *component,
 179                                     struct snd_pcm_substream *substream)
 180 {
 181         return snd_dmaengine_pcm_pointer(substream);
 182 }
 183 EXPORT_SYMBOL_GPL(tegra_pcm_pointer);
 184
 185 static int tegra_pcm_dma_allocate(struct device *dev, struct snd_soc_pcm_runtime *rtd,
 186                                   size_t size)
 187 {
 188         struct snd_pcm *pcm = rtd->pcm;
 189         int ret;
 190
 191         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 192         if (ret < 0)
 193                 return ret;
 194
 195         return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC, dev, size);
 196 }
 197
 198 int tegra_pcm_construct(struct snd_soc_component *component,
 199                         struct snd_soc_pcm_runtime *rtd)
 200 {
 201         struct device *dev = component->dev;
 202
 203         /*
 204          * Fallback for backwards-compatibility with older device trees that
 205          * have the iommus property in the virtual, top-level "sound" node.
 206          */
 207         if (!of_get_property(dev->of_node, "iommus", NULL))
 208                 dev = rtd->card->snd_card->dev;
 209
 210         return tegra_pcm_dma_allocate(dev, rtd, tegra_pcm_hardware.buffer_bytes_max);
 211 }
 212 EXPORT_SYMBOL_GPL(tegra_pcm_construct);
 213
 214 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 215 MODULE_DESCRIPTION("Tegra PCM ASoC driver");
 216 MODULE_LICENSE("GPL");