sound/arm/pxa2xx-pcm-lib.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <linux/slab.h>
   4 #include <linux/module.h>
   5 #include <linux/dma-mapping.h>
   6 #include <linux/dmaengine.h>
   7 #include <linux/dma/pxa-dma.h>
   8
   9 #include <sound/core.h>
  10 #include <sound/pcm.h>
  11 #include <sound/pcm_params.h>
  12 #include <sound/pxa2xx-lib.h>
  13 #include <sound/dmaengine_pcm.h>
  14
  15 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
  16         .info                   = SNDRV_PCM_INFO_MMAP |
  17                                   SNDRV_PCM_INFO_MMAP_VALID |
  18                                   SNDRV_PCM_INFO_INTERLEAVED |
  19                                   SNDRV_PCM_INFO_PAUSE |
  20                                   SNDRV_PCM_INFO_RESUME,
  21         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  22                                   SNDRV_PCM_FMTBIT_S24_LE |
  23                                   SNDRV_PCM_FMTBIT_S32_LE,
  24         .period_bytes_min       = 32,
  25         .period_bytes_max       = 8192 - 32,
  26         .periods_min            = 1,
  27         .periods_max            = 256,
  28         .buffer_bytes_max       = 128 * 1024,
  29         .fifo_size              = 32,
  30 };
  31
  32 int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
  33                          struct snd_pcm_hw_params *params)
  34 {
  35         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
  36         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
  37         struct snd_dmaengine_dai_dma_data *dma_params;
  38         struct dma_slave_config config;
  39         int ret;
  40
  41         dma_params = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
  42         if (!dma_params)
  43                 return 0;
  44
  45         ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
  46         if (ret)
  47                 return ret;
  48
  49         snd_dmaengine_pcm_set_config_from_dai_data(substream,
  50                         snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream),
  51                         &config);
  52
  53         ret = dmaengine_slave_config(chan, &config);
  54         if (ret)
  55                 return ret;
  56
  57         return 0;
  58 }
  59 EXPORT_SYMBOL(pxa2xx_pcm_hw_params);
  60
  61 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
  62 {
  63         return snd_dmaengine_pcm_trigger(substream, cmd);
  64 }
  65 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
  66
  67 snd_pcm_uframes_t
  68 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
  69 {
  70         return snd_dmaengine_pcm_pointer(substream);
  71 }
  72 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
  73
  74 int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
  75 {
  76         return 0;
  77 }
  78 EXPORT_SYMBOL(pxa2xx_pcm_prepare);
  79
  80 int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
  81 {
  82         struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
  83         struct snd_pcm_runtime *runtime = substream->runtime;
  84         struct snd_dmaengine_dai_dma_data *dma_params;
  85         int ret;
  86
  87         runtime->hw = pxa2xx_pcm_hardware;
  88
  89         dma_params = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
  90         if (!dma_params)
  91                 return 0;
  92
  93         /*
  94          * For mysterious reasons (and despite what the manual says)
  95          * playback samples are lost if the DMA count is not a multiple
  96          * of the DMA burst size.  Let's add a rule to enforce that.
  97          */
  98         ret = snd_pcm_hw_constraint_step(runtime, 0,
  99                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
 100         if (ret)
 101                 return ret;
 102
 103         ret = snd_pcm_hw_constraint_step(runtime, 0,
 104                 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
 105         if (ret)
 106                 return ret;
 107
 108         ret = snd_pcm_hw_constraint_integer(runtime,
 109                                             SNDRV_PCM_HW_PARAM_PERIODS);
 110         if (ret < 0)
 111                 return ret;
 112
 113         return snd_dmaengine_pcm_open(
 114                 substream, dma_request_slave_channel(snd_soc_rtd_to_cpu(rtd, 0)->dev,
 115                                                      dma_params->chan_name));
 116 }
 117 EXPORT_SYMBOL(pxa2xx_pcm_open);
 118
 119 int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
 120 {
 121         return snd_dmaengine_pcm_close_release_chan(substream);
 122 }
 123 EXPORT_SYMBOL(pxa2xx_pcm_close);
 124
 125 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm)
 126 {
 127         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
 128
 129         return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,
 130                                             pcm->card->dev, size);
 131 }
 132 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
 133
 134 int pxa2xx_soc_pcm_new(struct snd_soc_component *component,
 135                        struct snd_soc_pcm_runtime *rtd)
 136 {
 137         struct snd_card *card = rtd->card->snd_card;
 138         struct snd_pcm *pcm = rtd->pcm;
 139         int ret;
 140
 141         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 142         if (ret)
 143                 return ret;
 144
 145         return pxa2xx_pcm_preallocate_dma_buffer(pcm);
 146 }
 147 EXPORT_SYMBOL(pxa2xx_soc_pcm_new);
 148
 149 int pxa2xx_soc_pcm_open(struct snd_soc_component *component,
 150                         struct snd_pcm_substream *substream)
 151 {
 152         return pxa2xx_pcm_open(substream);
 153 }
 154 EXPORT_SYMBOL(pxa2xx_soc_pcm_open);
 155
 156 int pxa2xx_soc_pcm_close(struct snd_soc_component *component,
 157                          struct snd_pcm_substream *substream)
 158 {
 159         return pxa2xx_pcm_close(substream);
 160 }
 161 EXPORT_SYMBOL(pxa2xx_soc_pcm_close);
 162
 163 int pxa2xx_soc_pcm_hw_params(struct snd_soc_component *component,
 164                              struct snd_pcm_substream *substream,
 165                              struct snd_pcm_hw_params *params)
 166 {
 167         return pxa2xx_pcm_hw_params(substream, params);
 168 }
 169 EXPORT_SYMBOL(pxa2xx_soc_pcm_hw_params);
 170
 171 int pxa2xx_soc_pcm_prepare(struct snd_soc_component *component,
 172                            struct snd_pcm_substream *substream)
 173 {
 174         return pxa2xx_pcm_prepare(substream);
 175 }
 176 EXPORT_SYMBOL(pxa2xx_soc_pcm_prepare);
 177
 178 int pxa2xx_soc_pcm_trigger(struct snd_soc_component *component,
 179                            struct snd_pcm_substream *substream, int cmd)
 180 {
 181         return pxa2xx_pcm_trigger(substream, cmd);
 182 }
 183 EXPORT_SYMBOL(pxa2xx_soc_pcm_trigger);
 184
 185 snd_pcm_uframes_t
 186 pxa2xx_soc_pcm_pointer(struct snd_soc_component *component,
 187                        struct snd_pcm_substream *substream)
 188 {
 189         return pxa2xx_pcm_pointer(substream);
 190 }
 191 EXPORT_SYMBOL(pxa2xx_soc_pcm_pointer);
 192
 193 MODULE_AUTHOR("Nicolas Pitre");
 194 MODULE_DESCRIPTION("Intel PXA2xx sound library");
 195 MODULE_LICENSE("GPL");