kernel/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                 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
  39
  40 static struct snd_pcm_hardware mmp_pcm_hardware[] = {
  41         {
  42                 .info                   = MMP_PCM_INFO,
  43                 .period_bytes_min       = 1024,
  44                 .period_bytes_max       = 2048,
  45                 .periods_min            = 2,
  46                 .periods_max            = 32,
  47                 .buffer_bytes_max       = 4096,
  48                 .fifo_size              = 32,
  49         },
  50         {
  51                 .info                   = MMP_PCM_INFO,
  52                 .period_bytes_min       = 1024,
  53                 .period_bytes_max       = 2048,
  54                 .periods_min            = 2,
  55                 .periods_max            = 32,
  56                 .buffer_bytes_max       = 4096,
  57                 .fifo_size              = 32,
  58         },
  59 };
  60
  61 static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
  62                               struct snd_pcm_hw_params *params)
  63 {
  64         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
  65         struct dma_slave_config slave_config;
  66         int ret;
  67
  68         ret =
  69             snd_dmaengine_pcm_prepare_slave_config(substream, params,
  70                                                    &slave_config);
  71         if (ret)
  72                 return ret;
  73
  74         ret = dmaengine_slave_config(chan, &slave_config);
  75         if (ret)
  76                 return ret;
  77
  78         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  79
  80         return 0;
  81 }
  82
  83 static bool filter(struct dma_chan *chan, void *param)
  84 {
  85         struct mmp_dma_data *dma_data = param;
  86         bool found = false;
  87         char *devname;
  88
  89         devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
  90                 dma_data->ssp_id);
  91         if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
  92                 (chan->chan_id == dma_data->dma_res->start)) {
  93                 found = true;
  94         }
  95
  96         kfree(devname);
  97         return found;
  98 }
  99
 100 static int mmp_pcm_open(struct snd_pcm_substream *substream)
 101 {
 102         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 103         struct platform_device *pdev = to_platform_device(rtd->platform->dev);
 104         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 105         struct mmp_dma_data dma_data;
 106         struct resource *r;
 107
 108         r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
 109         if (!r)
 110                 return -EBUSY;
 111
 112         snd_soc_set_runtime_hwparams(substream,
 113                                 &mmp_pcm_hardware[substream->stream]);
 114
 115         dma_data.dma_res = r;
 116         dma_data.ssp_id = cpu_dai->id;
 117
 118         return snd_dmaengine_pcm_open_request_chan(substream, filter,
 119                     &dma_data);
 120 }
 121
 122 static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
 123                          struct vm_area_struct *vma)
 124 {
 125         struct snd_pcm_runtime *runtime = substream->runtime;
 126         unsigned long off = vma->vm_pgoff;
 127
 128         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 129         return remap_pfn_range(vma, vma->vm_start,
 130                 __phys_to_pfn(runtime->dma_addr) + off,
 131                 vma->vm_end - vma->vm_start, vma->vm_page_prot);
 132 }
 133
 134 static struct snd_pcm_ops mmp_pcm_ops = {
 135         .open           = mmp_pcm_open,
 136         .close          = snd_dmaengine_pcm_close_release_chan,
 137         .ioctl          = snd_pcm_lib_ioctl,
 138         .hw_params      = mmp_pcm_hw_params,
 139         .trigger        = snd_dmaengine_pcm_trigger,
 140         .pointer        = snd_dmaengine_pcm_pointer,
 141         .mmap           = mmp_pcm_mmap,
 142 };
 143
 144 static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
 145 {
 146         struct snd_pcm_substream *substream;
 147         struct snd_dma_buffer *buf;
 148         int stream;
 149         struct gen_pool *gpool;
 150
 151         gpool = sram_get_gpool("asram");
 152         if (!gpool)
 153                 return;
 154
 155         for (stream = 0; stream < 2; stream++) {
 156                 size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 157
 158                 substream = pcm->streams[stream].substream;
 159                 if (!substream)
 160                         continue;
 161
 162                 buf = &substream->dma_buffer;
 163                 if (!buf->area)
 164                         continue;
 165                 gen_pool_free(gpool, (unsigned long)buf->area, size);
 166                 buf->area = NULL;
 167         }
 168
 169         return;
 170 }
 171
 172 static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
 173                                                                 int stream)
 174 {
 175         struct snd_dma_buffer *buf = &substream->dma_buffer;
 176         size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 177         struct gen_pool *gpool;
 178
 179         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 180         buf->dev.dev = substream->pcm->card->dev;
 181         buf->private_data = NULL;
 182
 183         gpool = sram_get_gpool("asram");
 184         if (!gpool)
 185                 return -ENOMEM;
 186
 187         buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
 188         if (!buf->area)
 189                 return -ENOMEM;
 190         buf->bytes = size;
 191         return 0;
 192 }
 193
 194 static int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
 195 {
 196         struct snd_pcm_substream *substream;
 197         struct snd_pcm *pcm = rtd->pcm;
 198         int ret = 0, stream;
 199
 200         for (stream = 0; stream < 2; stream++) {
 201                 substream = pcm->streams[stream].substream;
 202
 203                 ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
 204                 if (ret)
 205                         goto err;
 206         }
 207
 208         return 0;
 209
 210 err:
 211         mmp_pcm_free_dma_buffers(pcm);
 212         return ret;
 213 }
 214
 215 static struct snd_soc_platform_driver mmp_soc_platform = {
 216         .ops            = &mmp_pcm_ops,
 217         .pcm_new        = mmp_pcm_new,
 218         .pcm_free       = mmp_pcm_free_dma_buffers,
 219 };
 220
 221 static int mmp_pcm_probe(struct platform_device *pdev)
 222 {
 223         struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
 224
 225         if (pdata) {
 226                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
 227                                                 pdata->buffer_max_playback;
 228                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
 229                                                 pdata->period_max_playback;
 230                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
 231                                                 pdata->buffer_max_capture;
 232                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
 233                                                 pdata->period_max_capture;
 234         }
 235         return snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
 236 }
 237
 238 static int mmp_pcm_remove(struct platform_device *pdev)
 239 {
 240         snd_soc_unregister_platform(&pdev->dev);
 241         return 0;
 242 }
 243
 244 static struct platform_driver mmp_pcm_driver = {
 245         .driver = {
 246                 .name = "mmp-pcm-audio",
 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");