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