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/mmp_audio.h>
  19 #include <sound/pxa2xx-lib.h>
  20 #include <sound/core.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/soc.h>
  24 #include <mach/sram.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         int ret;
 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         dma_data = devm_kzalloc(&pdev->dev,
 132                         sizeof(struct mmp_dma_data), GFP_KERNEL);
 133         if (dma_data == NULL)
 134                 return -ENOMEM;
 135
 136         dma_data->dma_res = r;
 137         dma_data->ssp_id = cpu_dai->id;
 138
 139         ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
 140         if (ret) {
 141                 devm_kfree(&pdev->dev, dma_data);
 142                 return ret;
 143         }
 144
 145         snd_dmaengine_pcm_set_data(substream, dma_data);
 146         return 0;
 147 }
 148
 149 static int mmp_pcm_close(struct snd_pcm_substream *substream)
 150 {
 151         struct mmp_dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
 152         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 153         struct platform_device *pdev = to_platform_device(rtd->platform->dev);
 154
 155         snd_dmaengine_pcm_close(substream);
 156         devm_kfree(&pdev->dev, dma_data);
 157         return 0;
 158 }
 159
 160 static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
 161                          struct vm_area_struct *vma)
 162 {
 163         struct snd_pcm_runtime *runtime = substream->runtime;
 164         unsigned long off = vma->vm_pgoff;
 165
 166         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 167         return remap_pfn_range(vma, vma->vm_start,
 168                 __phys_to_pfn(runtime->dma_addr) + off,
 169                 vma->vm_end - vma->vm_start, vma->vm_page_prot);
 170 }
 171
 172 struct snd_pcm_ops mmp_pcm_ops = {
 173         .open           = mmp_pcm_open,
 174         .close          = mmp_pcm_close,
 175         .ioctl          = snd_pcm_lib_ioctl,
 176         .hw_params      = mmp_pcm_hw_params,
 177         .trigger        = snd_dmaengine_pcm_trigger,
 178         .pointer        = snd_dmaengine_pcm_pointer,
 179         .mmap           = mmp_pcm_mmap,
 180 };
 181
 182 static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
 183 {
 184         struct snd_pcm_substream *substream;
 185         struct snd_dma_buffer *buf;
 186         int stream;
 187         struct gen_pool *gpool;
 188
 189         gpool = sram_get_gpool("asram");
 190         if (!gpool)
 191                 return;
 192
 193         for (stream = 0; stream < 2; stream++) {
 194                 size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 195
 196                 substream = pcm->streams[stream].substream;
 197                 if (!substream)
 198                         continue;
 199
 200                 buf = &substream->dma_buffer;
 201                 if (!buf->area)
 202                         continue;
 203                 gen_pool_free(gpool, (unsigned long)buf->area, size);
 204                 buf->area = NULL;
 205         }
 206
 207         return;
 208 }
 209
 210 static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
 211                                                                 int stream)
 212 {
 213         struct snd_dma_buffer *buf = &substream->dma_buffer;
 214         size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 215         struct gen_pool *gpool;
 216
 217         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 218         buf->dev.dev = substream->pcm->card->dev;
 219         buf->private_data = NULL;
 220
 221         gpool = sram_get_gpool("asram");
 222         if (!gpool)
 223                 return -ENOMEM;
 224
 225         buf->area = (unsigned char *)gen_pool_alloc(gpool, size);
 226         if (!buf->area)
 227                 return -ENOMEM;
 228         buf->addr = gen_pool_virt_to_phys(gpool, (unsigned long)buf->area);
 229         buf->bytes = size;
 230         return 0;
 231 }
 232
 233 int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
 234 {
 235         struct snd_pcm_substream *substream;
 236         struct snd_pcm *pcm = rtd->pcm;
 237         int ret = 0, stream;
 238
 239         for (stream = 0; stream < 2; stream++) {
 240                 substream = pcm->streams[stream].substream;
 241
 242                 ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
 243                 if (ret)
 244                         goto err;
 245         }
 246
 247         return 0;
 248
 249 err:
 250         mmp_pcm_free_dma_buffers(pcm);
 251         return ret;
 252 }
 253
 254 struct snd_soc_platform_driver mmp_soc_platform = {
 255         .ops            = &mmp_pcm_ops,
 256         .pcm_new        = mmp_pcm_new,
 257         .pcm_free       = mmp_pcm_free_dma_buffers,
 258 };
 259
 260 static __devinit int mmp_pcm_probe(struct platform_device *pdev)
 261 {
 262         struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
 263
 264         if (pdata) {
 265                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
 266                                                 pdata->buffer_max_playback;
 267                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
 268                                                 pdata->period_max_playback;
 269                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
 270                                                 pdata->buffer_max_capture;
 271                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
 272                                                 pdata->period_max_capture;
 273         }
 274         return snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
 275 }
 276
 277 static int __devexit mmp_pcm_remove(struct platform_device *pdev)
 278 {
 279         snd_soc_unregister_platform(&pdev->dev);
 280         return 0;
 281 }
 282
 283 static struct platform_driver mmp_pcm_driver = {
 284         .driver = {
 285                 .name = "mmp-pcm-audio",
 286                 .owner = THIS_MODULE,
 287         },
 288
 289         .probe = mmp_pcm_probe,
 290         .remove = __devexit_p(mmp_pcm_remove),
 291 };
 292
 293 module_platform_driver(mmp_pcm_driver);
 294
 295 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 296 MODULE_DESCRIPTION("MMP Soc Audio DMA module");
 297 MODULE_LICENSE("GPL");