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 #include <sound/pxa2xx-lib.h>
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/soc.h>
  25 #include <sound/dmaengine_pcm.h>
  26
  27 struct mmp_dma_data {
  28         int ssp_id;
  29         struct resource *dma_res;
  30 };
  31
  32 #define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP |     \
  33                 SNDRV_PCM_INFO_MMAP_VALID |     \
  34                 SNDRV_PCM_INFO_INTERLEAVED |    \
  35                 SNDRV_PCM_INFO_PAUSE |          \
  36                 SNDRV_PCM_INFO_RESUME)
  37
  38 #define MMP_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
  39                          SNDRV_PCM_FMTBIT_S24_LE | \
  40                          SNDRV_PCM_FMTBIT_S32_LE)
  41
  42 static struct snd_pcm_hardware mmp_pcm_hardware[] = {
  43         {
  44                 .info                   = MMP_PCM_INFO,
  45                 .formats                = MMP_PCM_FORMATS,
  46                 .period_bytes_min       = 1024,
  47                 .period_bytes_max       = 2048,
  48                 .periods_min            = 2,
  49                 .periods_max            = 32,
  50                 .buffer_bytes_max       = 4096,
  51                 .fifo_size              = 32,
  52         },
  53         {
  54                 .info                   = MMP_PCM_INFO,
  55                 .formats                = MMP_PCM_FORMATS,
  56                 .period_bytes_min       = 1024,
  57                 .period_bytes_max       = 2048,
  58                 .periods_min            = 2,
  59                 .periods_max            = 32,
  60                 .buffer_bytes_max       = 4096,
  61                 .fifo_size              = 32,
  62         },
  63 };
  64
  65 static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
  66                               struct snd_pcm_hw_params *params)
  67 {
  68         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
  69         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  70         struct pxa2xx_pcm_dma_params *dma_params;
  71         struct dma_slave_config slave_config;
  72         int ret;
  73
  74         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  75         if (!dma_params)
  76                 return 0;
  77
  78         ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config);
  79         if (ret)
  80                 return ret;
  81
  82         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  83                 slave_config.dst_addr     = dma_params->dev_addr;
  84                 slave_config.dst_maxburst = 4;
  85         } else {
  86                 slave_config.src_addr     = dma_params->dev_addr;
  87                 slave_config.src_maxburst = 4;
  88         }
  89
  90         ret = dmaengine_slave_config(chan, &slave_config);
  91         if (ret)
  92                 return ret;
  93
  94         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  95
  96         return 0;
  97 }
  98
  99 static bool filter(struct dma_chan *chan, void *param)
 100 {
 101         struct mmp_dma_data *dma_data = param;
 102         bool found = false;
 103         char *devname;
 104
 105         devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
 106                 dma_data->ssp_id);
 107         if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
 108                 (chan->chan_id == dma_data->dma_res->start)) {
 109                 found = true;
 110         }
 111
 112         kfree(devname);
 113         return found;
 114 }
 115
 116 static int mmp_pcm_open(struct snd_pcm_substream *substream)
 117 {
 118         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 119         struct platform_device *pdev = to_platform_device(rtd->platform->dev);
 120         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 121         struct mmp_dma_data dma_data;
 122         struct resource *r;
 123
 124         r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
 125         if (!r)
 126                 return -EBUSY;
 127
 128         snd_soc_set_runtime_hwparams(substream,
 129                                 &mmp_pcm_hardware[substream->stream]);
 130
 131         dma_data.dma_res = r;
 132         dma_data.ssp_id = cpu_dai->id;
 133
 134         return snd_dmaengine_pcm_open_request_chan(substream, filter,
 135                     &dma_data);
 136 }
 137
 138 static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
 139                          struct vm_area_struct *vma)
 140 {
 141         struct snd_pcm_runtime *runtime = substream->runtime;
 142         unsigned long off = vma->vm_pgoff;
 143
 144         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 145         return remap_pfn_range(vma, vma->vm_start,
 146                 __phys_to_pfn(runtime->dma_addr) + off,
 147                 vma->vm_end - vma->vm_start, vma->vm_page_prot);
 148 }
 149
 150 struct snd_pcm_ops mmp_pcm_ops = {
 151         .open           = mmp_pcm_open,
 152         .close          = snd_dmaengine_pcm_close_release_chan,
 153         .ioctl          = snd_pcm_lib_ioctl,
 154         .hw_params      = mmp_pcm_hw_params,
 155         .trigger        = snd_dmaengine_pcm_trigger,
 156         .pointer        = snd_dmaengine_pcm_pointer,
 157         .mmap           = mmp_pcm_mmap,
 158 };
 159
 160 static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
 161 {
 162         struct snd_pcm_substream *substream;
 163         struct snd_dma_buffer *buf;
 164         int stream;
 165         struct gen_pool *gpool;
 166
 167         gpool = sram_get_gpool("asram");
 168         if (!gpool)
 169                 return;
 170
 171         for (stream = 0; stream < 2; stream++) {
 172                 size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 173
 174                 substream = pcm->streams[stream].substream;
 175                 if (!substream)
 176                         continue;
 177
 178                 buf = &substream->dma_buffer;
 179                 if (!buf->area)
 180                         continue;
 181                 gen_pool_free(gpool, (unsigned long)buf->area, size);
 182                 buf->area = NULL;
 183         }
 184
 185         return;
 186 }
 187
 188 static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
 189                                                                 int stream)
 190 {
 191         struct snd_dma_buffer *buf = &substream->dma_buffer;
 192         size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 193         struct gen_pool *gpool;
 194
 195         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 196         buf->dev.dev = substream->pcm->card->dev;
 197         buf->private_data = NULL;
 198
 199         gpool = sram_get_gpool("asram");
 200         if (!gpool)
 201                 return -ENOMEM;
 202
 203         buf->area = (unsigned char *)gen_pool_alloc(gpool, size);
 204         if (!buf->area)
 205                 return -ENOMEM;
 206         buf->addr = gen_pool_virt_to_phys(gpool, (unsigned long)buf->area);
 207         buf->bytes = size;
 208         return 0;
 209 }
 210
 211 int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
 212 {
 213         struct snd_pcm_substream *substream;
 214         struct snd_pcm *pcm = rtd->pcm;
 215         int ret = 0, stream;
 216
 217         for (stream = 0; stream < 2; stream++) {
 218                 substream = pcm->streams[stream].substream;
 219
 220                 ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
 221                 if (ret)
 222                         goto err;
 223         }
 224
 225         return 0;
 226
 227 err:
 228         mmp_pcm_free_dma_buffers(pcm);
 229         return ret;
 230 }
 231
 232 struct snd_soc_platform_driver mmp_soc_platform = {
 233         .ops            = &mmp_pcm_ops,
 234         .pcm_new        = mmp_pcm_new,
 235         .pcm_free       = mmp_pcm_free_dma_buffers,
 236 };
 237
 238 static int mmp_pcm_probe(struct platform_device *pdev)
 239 {
 240         struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
 241
 242         if (pdata) {
 243                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
 244                                                 pdata->buffer_max_playback;
 245                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
 246                                                 pdata->period_max_playback;
 247                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
 248                                                 pdata->buffer_max_capture;
 249                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
 250                                                 pdata->period_max_capture;
 251         }
 252         return snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
 253 }
 254
 255 static int mmp_pcm_remove(struct platform_device *pdev)
 256 {
 257         snd_soc_unregister_platform(&pdev->dev);
 258         return 0;
 259 }
 260
 261 static struct platform_driver mmp_pcm_driver = {
 262         .driver = {
 263                 .name = "mmp-pcm-audio",
 264                 .owner = THIS_MODULE,
 265         },
 266
 267         .probe = mmp_pcm_probe,
 268         .remove = mmp_pcm_remove,
 269 };
 270
 271 module_platform_driver(mmp_pcm_driver);
 272
 273 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 274 MODULE_DESCRIPTION("MMP Soc Audio DMA module");
 275 MODULE_LICENSE("GPL");