sound/arm/pxa2xx-pcm-lib.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License version 2 as
   4  * published by the Free Software Foundation.
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/module.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/dmaengine.h>
  11 #include <linux/dma/pxa-dma.h>
  12
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/pcm_params.h>
  16 #include <sound/pxa2xx-lib.h>
  17 #include <sound/dmaengine_pcm.h>
  18
  19 #include "pxa2xx-pcm.h"
  20
  21 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
  22         .info                   = SNDRV_PCM_INFO_MMAP |
  23                                   SNDRV_PCM_INFO_MMAP_VALID |
  24                                   SNDRV_PCM_INFO_INTERLEAVED |
  25                                   SNDRV_PCM_INFO_PAUSE |
  26                                   SNDRV_PCM_INFO_RESUME,
  27         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  28                                         SNDRV_PCM_FMTBIT_S24_LE |
  29                                         SNDRV_PCM_FMTBIT_S32_LE,
  30         .period_bytes_min       = 32,
  31         .period_bytes_max       = 8192 - 32,
  32         .periods_min            = 1,
  33         .periods_max            = 256,
  34         .buffer_bytes_max       = 128 * 1024,
  35         .fifo_size              = 32,
  36 };
  37
  38 int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
  39                                 struct snd_pcm_hw_params *params)
  40 {
  41         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
  42         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  43         struct snd_dmaengine_dai_dma_data *dma_params;
  44         struct dma_slave_config config;
  45         int ret;
  46
  47         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  48         if (!dma_params)
  49                 return 0;
  50
  51         ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
  52         if (ret)
  53                 return ret;
  54
  55         snd_dmaengine_pcm_set_config_from_dai_data(substream,
  56                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
  57                         &config);
  58
  59         ret = dmaengine_slave_config(chan, &config);
  60         if (ret)
  61                 return ret;
  62
  63         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  64
  65         return 0;
  66 }
  67 EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
  68
  69 int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  70 {
  71         snd_pcm_set_runtime_buffer(substream, NULL);
  72         return 0;
  73 }
  74 EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
  75
  76 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
  77 {
  78         return snd_dmaengine_pcm_trigger(substream, cmd);
  79 }
  80 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
  81
  82 snd_pcm_uframes_t
  83 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
  84 {
  85         return snd_dmaengine_pcm_pointer(substream);
  86 }
  87 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
  88
  89 int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
  90 {
  91         return 0;
  92 }
  93 EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
  94
  95 int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
  96 {
  97         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  98         struct snd_pcm_runtime *runtime = substream->runtime;
  99         struct snd_dmaengine_dai_dma_data *dma_params;
 100         int ret;
 101
 102         runtime->hw = pxa2xx_pcm_hardware;
 103
 104         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 105         if (!dma_params)
 106                 return 0;
 107
 108         /*
 109          * For mysterious reasons (and despite what the manual says)
 110          * playback samples are lost if the DMA count is not a multiple
 111          * of the DMA burst size.  Let's add a rule to enforce that.
 112          */
 113         ret = snd_pcm_hw_constraint_step(runtime, 0,
 114                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
 115         if (ret)
 116                 return ret;
 117
 118         ret = snd_pcm_hw_constraint_step(runtime, 0,
 119                 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
 120         if (ret)
 121                 return ret;
 122
 123         ret = snd_pcm_hw_constraint_integer(runtime,
 124                                             SNDRV_PCM_HW_PARAM_PERIODS);
 125         if (ret < 0)
 126                 return ret;
 127
 128         return snd_dmaengine_pcm_open_request_chan(substream,
 129                                         pxad_filter_fn,
 130                                         dma_params->filter_data);
 131 }
 132 EXPORT_SYMBOL(__pxa2xx_pcm_open);
 133
 134 int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
 135 {
 136         return snd_dmaengine_pcm_close_release_chan(substream);
 137 }
 138 EXPORT_SYMBOL(__pxa2xx_pcm_close);
 139
 140 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
 141         struct vm_area_struct *vma)
 142 {
 143         struct snd_pcm_runtime *runtime = substream->runtime;
 144         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 145                                      runtime->dma_area,
 146                                      runtime->dma_addr,
 147                                      runtime->dma_bytes);
 148 }
 149 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
 150
 151 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 152 {
 153         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 154         struct snd_dma_buffer *buf = &substream->dma_buffer;
 155         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
 156         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 157         buf->dev.dev = pcm->card->dev;
 158         buf->private_data = NULL;
 159         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 160                                            &buf->addr, GFP_KERNEL);
 161         if (!buf->area)
 162                 return -ENOMEM;
 163         buf->bytes = size;
 164         return 0;
 165 }
 166 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
 167
 168 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 169 {
 170         struct snd_pcm_substream *substream;
 171         struct snd_dma_buffer *buf;
 172         int stream;
 173
 174         for (stream = 0; stream < 2; stream++) {
 175                 substream = pcm->streams[stream].substream;
 176                 if (!substream)
 177                         continue;
 178                 buf = &substream->dma_buffer;
 179                 if (!buf->area)
 180                         continue;
 181                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 182                                       buf->area, buf->addr);
 183                 buf->area = NULL;
 184         }
 185 }
 186 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
 187
 188 MODULE_AUTHOR("Nicolas Pitre");
 189 MODULE_DESCRIPTION("Intel PXA2xx sound library");
 190 MODULE_LICENSE("GPL");