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 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
  20         .info                   = SNDRV_PCM_INFO_MMAP |
  21                                   SNDRV_PCM_INFO_MMAP_VALID |
  22                                   SNDRV_PCM_INFO_INTERLEAVED |
  23                                   SNDRV_PCM_INFO_PAUSE |
  24                                   SNDRV_PCM_INFO_RESUME,
  25         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  26                                   SNDRV_PCM_FMTBIT_S24_LE |
  27                                   SNDRV_PCM_FMTBIT_S32_LE,
  28         .period_bytes_min       = 32,
  29         .period_bytes_max       = 8192 - 32,
  30         .periods_min            = 1,
  31         .periods_max            = 256,
  32         .buffer_bytes_max       = 128 * 1024,
  33         .fifo_size              = 32,
  34 };
  35
  36 int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
  37                          struct snd_pcm_hw_params *params)
  38 {
  39         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
  40         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  41         struct snd_dmaengine_dai_dma_data *dma_params;
  42         struct dma_slave_config config;
  43         int ret;
  44
  45         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  46         if (!dma_params)
  47                 return 0;
  48
  49         ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
  50         if (ret)
  51                 return ret;
  52
  53         snd_dmaengine_pcm_set_config_from_dai_data(substream,
  54                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
  55                         &config);
  56
  57         ret = dmaengine_slave_config(chan, &config);
  58         if (ret)
  59                 return ret;
  60
  61         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  62
  63         return 0;
  64 }
  65 EXPORT_SYMBOL(pxa2xx_pcm_hw_params);
  66
  67 int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  68 {
  69         snd_pcm_set_runtime_buffer(substream, NULL);
  70         return 0;
  71 }
  72 EXPORT_SYMBOL(pxa2xx_pcm_hw_free);
  73
  74 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
  75 {
  76         return snd_dmaengine_pcm_trigger(substream, cmd);
  77 }
  78 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
  79
  80 snd_pcm_uframes_t
  81 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
  82 {
  83         return snd_dmaengine_pcm_pointer(substream);
  84 }
  85 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
  86
  87 int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
  88 {
  89         return 0;
  90 }
  91 EXPORT_SYMBOL(pxa2xx_pcm_prepare);
  92
  93 int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
  94 {
  95         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  96         struct snd_pcm_runtime *runtime = substream->runtime;
  97         struct snd_dmaengine_dai_dma_data *dma_params;
  98         int ret;
  99
 100         runtime->hw = pxa2xx_pcm_hardware;
 101
 102         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 103         if (!dma_params)
 104                 return 0;
 105
 106         /*
 107          * For mysterious reasons (and despite what the manual says)
 108          * playback samples are lost if the DMA count is not a multiple
 109          * of the DMA burst size.  Let's add a rule to enforce that.
 110          */
 111         ret = snd_pcm_hw_constraint_step(runtime, 0,
 112                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
 113         if (ret)
 114                 return ret;
 115
 116         ret = snd_pcm_hw_constraint_step(runtime, 0,
 117                 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
 118         if (ret)
 119                 return ret;
 120
 121         ret = snd_pcm_hw_constraint_integer(runtime,
 122                                             SNDRV_PCM_HW_PARAM_PERIODS);
 123         if (ret < 0)
 124                 return ret;
 125
 126         return snd_dmaengine_pcm_open(
 127                 substream, dma_request_slave_channel(rtd->cpu_dai->dev,
 128                                                      dma_params->chan_name));
 129 }
 130 EXPORT_SYMBOL(pxa2xx_pcm_open);
 131
 132 int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
 133 {
 134         return snd_dmaengine_pcm_close_release_chan(substream);
 135 }
 136 EXPORT_SYMBOL(pxa2xx_pcm_close);
 137
 138 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
 139         struct vm_area_struct *vma)
 140 {
 141         struct snd_pcm_runtime *runtime = substream->runtime;
 142         return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
 143                            runtime->dma_addr, runtime->dma_bytes);
 144 }
 145 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
 146
 147 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 148 {
 149         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 150         struct snd_dma_buffer *buf = &substream->dma_buffer;
 151         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
 152         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 153         buf->dev.dev = pcm->card->dev;
 154         buf->private_data = NULL;
 155         buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
 156         if (!buf->area)
 157                 return -ENOMEM;
 158         buf->bytes = size;
 159         return 0;
 160 }
 161 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
 162
 163 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 164 {
 165         struct snd_pcm_substream *substream;
 166         struct snd_dma_buffer *buf;
 167         int stream;
 168
 169         for (stream = 0; stream < 2; stream++) {
 170                 substream = pcm->streams[stream].substream;
 171                 if (!substream)
 172                         continue;
 173                 buf = &substream->dma_buffer;
 174                 if (!buf->area)
 175                         continue;
 176                 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
 177                 buf->area = NULL;
 178         }
 179 }
 180 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
 181
 182 int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
 183 {
 184         struct snd_card *card = rtd->card->snd_card;
 185         struct snd_pcm *pcm = rtd->pcm;
 186         int ret;
 187
 188         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 189         if (ret)
 190                 return ret;
 191
 192         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 193                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 194                         SNDRV_PCM_STREAM_PLAYBACK);
 195                 if (ret)
 196                         goto out;
 197         }
 198
 199         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 200                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 201                         SNDRV_PCM_STREAM_CAPTURE);
 202                 if (ret)
 203                         goto out;
 204         }
 205  out:
 206         return ret;
 207 }
 208 EXPORT_SYMBOL(pxa2xx_soc_pcm_new);
 209
 210 const struct snd_pcm_ops pxa2xx_pcm_ops = {
 211         .open           = pxa2xx_pcm_open,
 212         .close          = pxa2xx_pcm_close,
 213         .ioctl          = snd_pcm_lib_ioctl,
 214         .hw_params      = pxa2xx_pcm_hw_params,
 215         .hw_free        = pxa2xx_pcm_hw_free,
 216         .prepare        = pxa2xx_pcm_prepare,
 217         .trigger        = pxa2xx_pcm_trigger,
 218         .pointer        = pxa2xx_pcm_pointer,
 219         .mmap           = pxa2xx_pcm_mmap,
 220 };
 221 EXPORT_SYMBOL(pxa2xx_pcm_ops);
 222
 223 MODULE_AUTHOR("Nicolas Pitre");
 224 MODULE_DESCRIPTION("Intel PXA2xx sound library");
 225 MODULE_LICENSE("GPL");