sound/soc/pxa/mmp-pcm.c

   1 /*
   2  * linux/sound/soc/pxa/mmp-pcm.c
   3  *
   4  * Copyright (C) 2011 Marvell International Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  */
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/dmaengine.h>
  18 #include <linux/platform_data/dma-mmp_tdma.h>
  19 #include <linux/platform_data/mmp_audio.h>
  20
  21 #include <sound/pxa2xx-lib.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include <sound/dmaengine_pcm.h>
  27
  28 struct mmp_dma_data {
  29         int ssp_id;
  30         struct resource *dma_res;
  31 };
  32
  33 #define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP |     \
  34                 SNDRV_PCM_INFO_MMAP_VALID |     \
  35                 SNDRV_PCM_INFO_INTERLEAVED |    \
  36                 SNDRV_PCM_INFO_PAUSE |          \
  37                 SNDRV_PCM_INFO_RESUME)
  38
  39 static struct snd_pcm_hardware mmp_pcm_hardware[] = {
  40         {
  41                 .info                   = MMP_PCM_INFO,
  42                 .period_bytes_min       = 1024,
  43                 .period_bytes_max       = 2048,
  44                 .periods_min            = 2,
  45                 .periods_max            = 32,
  46                 .buffer_bytes_max       = 4096,
  47                 .fifo_size              = 32,
  48         },
  49         {
  50                 .info                   = MMP_PCM_INFO,
  51                 .period_bytes_min       = 1024,
  52                 .period_bytes_max       = 2048,
  53                 .periods_min            = 2,
  54                 .periods_max            = 32,
  55                 .buffer_bytes_max       = 4096,
  56                 .fifo_size              = 32,
  57         },
  58 };
  59
  60 static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
  61                               struct snd_pcm_hw_params *params)
  62 {
  63         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
  64         struct dma_slave_config slave_config;
  65         int ret;
  66
  67         ret =
  68             snd_dmaengine_pcm_prepare_slave_config(substream, params,
  69                                                    &slave_config);
  70         if (ret)
  71                 return ret;
  72
  73         ret = dmaengine_slave_config(chan, &slave_config);
  74         if (ret)
  75                 return ret;
  76
  77         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  78
  79         return 0;
  80 }
  81
  82 static bool filter(struct dma_chan *chan, void *param)
  83 {
  84         struct mmp_dma_data *dma_data = param;
  85         bool found = false;
  86         char *devname;
  87
  88         devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
  89                 dma_data->ssp_id);
  90         if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
  91                 (chan->chan_id == dma_data->dma_res->start)) {
  92                 found = true;
  93         }
  94
  95         kfree(devname);
  96         return found;
  97 }
  98
  99 static int mmp_pcm_open(struct snd_pcm_substream *substream)
 100 {
 101         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 102         struct platform_device *pdev = to_platform_device(rtd->platform->dev);
 103         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 104         struct mmp_dma_data dma_data;
 105         struct resource *r;
 106
 107         r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
 108         if (!r)
 109                 return -EBUSY;
 110
 111         snd_soc_set_runtime_hwparams(substream,
 112                                 &mmp_pcm_hardware[substream->stream]);
 113
 114         dma_data.dma_res = r;
 115         dma_data.ssp_id = cpu_dai->id;
 116
 117         return snd_dmaengine_pcm_open_request_chan(substream, filter,
 118                     &dma_data);
 119 }
 120
 121 static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
 122                          struct vm_area_struct *vma)
 123 {
 124         struct snd_pcm_runtime *runtime = substream->runtime;
 125         unsigned long off = vma->vm_pgoff;
 126
 127         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 128         return remap_pfn_range(vma, vma->vm_start,
 129                 __phys_to_pfn(runtime->dma_addr) + off,
 130                 vma->vm_end - vma->vm_start, vma->vm_page_prot);
 131 }
 132
 133 static struct snd_pcm_ops mmp_pcm_ops = {
 134         .open           = mmp_pcm_open,
 135         .close          = snd_dmaengine_pcm_close_release_chan,
 136         .ioctl          = snd_pcm_lib_ioctl,
 137         .hw_params      = mmp_pcm_hw_params,
 138         .trigger        = snd_dmaengine_pcm_trigger,
 139         .pointer        = snd_dmaengine_pcm_pointer,
 140         .mmap           = mmp_pcm_mmap,
 141 };
 142
 143 static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
 144 {
 145         struct snd_pcm_substream *substream;
 146         struct snd_dma_buffer *buf;
 147         int stream;
 148         struct gen_pool *gpool;
 149
 150         gpool = sram_get_gpool("asram");
 151         if (!gpool)
 152                 return;
 153
 154         for (stream = 0; stream < 2; stream++) {
 155                 size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 156
 157                 substream = pcm->streams[stream].substream;
 158                 if (!substream)
 159                         continue;
 160
 161                 buf = &substream->dma_buffer;
 162                 if (!buf->area)
 163                         continue;
 164                 gen_pool_free(gpool, (unsigned long)buf->area, size);
 165                 buf->area = NULL;
 166         }
 167
 168         return;
 169 }
 170
 171 static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
 172                                                                 int stream)
 173 {
 174         struct snd_dma_buffer *buf = &substream->dma_buffer;
 175         size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 176         struct gen_pool *gpool;
 177
 178         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 179         buf->dev.dev = substream->pcm->card->dev;
 180         buf->private_data = NULL;
 181
 182         gpool = sram_get_gpool("asram");
 183         if (!gpool)
 184                 return -ENOMEM;
 185
 186         buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
 187         if (!buf->area)
 188                 return -ENOMEM;
 189         buf->bytes = size;
 190         return 0;
 191 }
 192
 193 static int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
 194 {
 195         struct snd_pcm_substream *substream;
 196         struct snd_pcm *pcm = rtd->pcm;
 197         int ret = 0, stream;
 198
 199         for (stream = 0; stream < 2; stream++) {
 200                 substream = pcm->streams[stream].substream;
 201
 202                 ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
 203                 if (ret)
 204                         goto err;
 205         }
 206
 207         return 0;
 208
 209 err:
 210         mmp_pcm_free_dma_buffers(pcm);
 211         return ret;
 212 }
 213
 214 static struct snd_soc_platform_driver mmp_soc_platform = {
 215         .ops            = &mmp_pcm_ops,
 216         .pcm_new        = mmp_pcm_new,
 217         .pcm_free       = mmp_pcm_free_dma_buffers,
 218 };
 219
 220 static int mmp_pcm_probe(struct platform_device *pdev)
 221 {
 222         struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
 223
 224         if (pdata) {
 225                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
 226                                                 pdata->buffer_max_playback;
 227                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
 228                                                 pdata->period_max_playback;
 229                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
 230                                                 pdata->buffer_max_capture;
 231                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
 232                                                 pdata->period_max_capture;
 233         }
 234         return snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
 235 }
 236
 237 static int mmp_pcm_remove(struct platform_device *pdev)
 238 {
 239         snd_soc_unregister_platform(&pdev->dev);
 240         return 0;
 241 }
 242
 243 static struct platform_driver mmp_pcm_driver = {
 244         .driver = {
 245                 .name = "mmp-pcm-audio",
 246                 .owner = THIS_MODULE,
 247         },
 248
 249         .probe = mmp_pcm_probe,
 250         .remove = mmp_pcm_remove,
 251 };
 252
 253 module_platform_driver(mmp_pcm_driver);
 254
 255 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 256 MODULE_DESCRIPTION("MMP Soc Audio DMA module");
 257 MODULE_LICENSE("GPL");