sound/soc/pxa/mmp-pcm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * linux/sound/soc/pxa/mmp-pcm.c
   4  *
   5  * Copyright (C) 2011 Marvell International Ltd.
   6  */
   7 #include <linux/module.h>
   8 #include <linux/init.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/slab.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/dmaengine.h>
  13 #include <linux/platform_data/dma-mmp_tdma.h>
  14 #include <linux/platform_data/mmp_audio.h>
  15
  16 #include <sound/pxa2xx-lib.h>
  17 #include <sound/core.h>
  18 #include <sound/pcm.h>
  19 #include <sound/pcm_params.h>
  20 #include <sound/soc.h>
  21 #include <sound/dmaengine_pcm.h>
  22
  23 #define DRV_NAME "mmp-pcm"
  24
  25 struct mmp_dma_data {
  26         int ssp_id;
  27         struct resource *dma_res;
  28 };
  29
  30 #define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP |     \
  31                 SNDRV_PCM_INFO_MMAP_VALID |     \
  32                 SNDRV_PCM_INFO_INTERLEAVED |    \
  33                 SNDRV_PCM_INFO_PAUSE |          \
  34                 SNDRV_PCM_INFO_RESUME |         \
  35                 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
  36
  37 static struct snd_pcm_hardware mmp_pcm_hardware[] = {
  38         {
  39                 .info                   = MMP_PCM_INFO,
  40                 .period_bytes_min       = 1024,
  41                 .period_bytes_max       = 2048,
  42                 .periods_min            = 2,
  43                 .periods_max            = 32,
  44                 .buffer_bytes_max       = 4096,
  45                 .fifo_size              = 32,
  46         },
  47         {
  48                 .info                   = MMP_PCM_INFO,
  49                 .period_bytes_min       = 1024,
  50                 .period_bytes_max       = 2048,
  51                 .periods_min            = 2,
  52                 .periods_max            = 32,
  53                 .buffer_bytes_max       = 4096,
  54                 .fifo_size              = 32,
  55         },
  56 };
  57
  58 static int mmp_pcm_hw_params(struct snd_soc_component *component,
  59                              struct snd_pcm_substream *substream,
  60                              struct snd_pcm_hw_params *params)
  61 {
  62         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
  63         struct dma_slave_config slave_config;
  64         int ret;
  65
  66         ret =
  67             snd_dmaengine_pcm_prepare_slave_config(substream, params,
  68                                                    &slave_config);
  69         if (ret)
  70                 return ret;
  71
  72         ret = dmaengine_slave_config(chan, &slave_config);
  73         if (ret)
  74                 return ret;
  75
  76         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  77
  78         return 0;
  79 }
  80
  81 static int mmp_pcm_trigger(struct snd_soc_component *component,
  82                            struct snd_pcm_substream *substream, int cmd)
  83 {
  84         return snd_dmaengine_pcm_trigger(substream, cmd);
  85 }
  86
  87 static snd_pcm_uframes_t mmp_pcm_pointer(struct snd_soc_component *component,
  88                                          struct snd_pcm_substream *substream)
  89 {
  90         return snd_dmaengine_pcm_pointer(substream);
  91 }
  92
  93 static bool filter(struct dma_chan *chan, void *param)
  94 {
  95         struct mmp_dma_data *dma_data = param;
  96         bool found = false;
  97         char *devname;
  98
  99         devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
 100                 dma_data->ssp_id);
 101         if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
 102                 (chan->chan_id == dma_data->dma_res->start)) {
 103                 found = true;
 104         }
 105
 106         kfree(devname);
 107         return found;
 108 }
 109
 110 static int mmp_pcm_open(struct snd_soc_component *component,
 111                         struct snd_pcm_substream *substream)
 112 {
 113         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 114         struct platform_device *pdev = to_platform_device(component->dev);
 115         struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
 116         struct mmp_dma_data dma_data;
 117         struct resource *r;
 118
 119         r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
 120         if (!r)
 121                 return -EBUSY;
 122
 123         snd_soc_set_runtime_hwparams(substream,
 124                                 &mmp_pcm_hardware[substream->stream]);
 125
 126         dma_data.dma_res = r;
 127         dma_data.ssp_id = cpu_dai->id;
 128
 129         return snd_dmaengine_pcm_open_request_chan(substream, filter,
 130                     &dma_data);
 131 }
 132
 133 static int mmp_pcm_close(struct snd_soc_component *component,
 134                          struct snd_pcm_substream *substream)
 135 {
 136         return snd_dmaengine_pcm_close_release_chan(substream);
 137 }
 138
 139 static int mmp_pcm_mmap(struct snd_soc_component *component,
 140                         struct snd_pcm_substream *substream,
 141                         struct vm_area_struct *vma)
 142 {
 143         struct snd_pcm_runtime *runtime = substream->runtime;
 144         unsigned long off = vma->vm_pgoff;
 145
 146         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 147         return remap_pfn_range(vma, vma->vm_start,
 148                 __phys_to_pfn(runtime->dma_addr) + off,
 149                 vma->vm_end - vma->vm_start, vma->vm_page_prot);
 150 }
 151
 152 static void mmp_pcm_free_dma_buffers(struct snd_soc_component *component,
 153                                      struct snd_pcm *pcm)
 154 {
 155         struct snd_pcm_substream *substream;
 156         struct snd_dma_buffer *buf;
 157         int stream;
 158         struct gen_pool *gpool;
 159
 160         gpool = sram_get_gpool("asram");
 161         if (!gpool)
 162                 return;
 163
 164         for (stream = 0; stream < 2; stream++) {
 165                 size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 166
 167                 substream = pcm->streams[stream].substream;
 168                 if (!substream)
 169                         continue;
 170
 171                 buf = &substream->dma_buffer;
 172                 if (!buf->area)
 173                         continue;
 174                 gen_pool_free(gpool, (unsigned long)buf->area, size);
 175                 buf->area = NULL;
 176         }
 177
 178 }
 179
 180 static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
 181                                                                 int stream)
 182 {
 183         struct snd_dma_buffer *buf = &substream->dma_buffer;
 184         size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 185         struct gen_pool *gpool;
 186
 187         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 188         buf->dev.dev = substream->pcm->card->dev;
 189         buf->private_data = NULL;
 190
 191         gpool = sram_get_gpool("asram");
 192         if (!gpool)
 193                 return -ENOMEM;
 194
 195         buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
 196         if (!buf->area)
 197                 return -ENOMEM;
 198         buf->bytes = size;
 199         return 0;
 200 }
 201
 202 static int mmp_pcm_new(struct snd_soc_component *component,
 203                        struct snd_soc_pcm_runtime *rtd)
 204 {
 205         struct snd_pcm_substream *substream;
 206         struct snd_pcm *pcm = rtd->pcm;
 207         int ret = 0, stream;
 208
 209         for (stream = 0; stream < 2; stream++) {
 210                 substream = pcm->streams[stream].substream;
 211
 212                 ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
 213                 if (ret)
 214                         goto err;
 215         }
 216
 217         return 0;
 218
 219 err:
 220         mmp_pcm_free_dma_buffers(component, pcm);
 221         return ret;
 222 }
 223
 224 static const struct snd_soc_component_driver mmp_soc_component = {
 225         .name           = DRV_NAME,
 226         .open           = mmp_pcm_open,
 227         .close          = mmp_pcm_close,
 228         .hw_params      = mmp_pcm_hw_params,
 229         .trigger        = mmp_pcm_trigger,
 230         .pointer        = mmp_pcm_pointer,
 231         .mmap           = mmp_pcm_mmap,
 232         .pcm_construct  = mmp_pcm_new,
 233         .pcm_destruct   = mmp_pcm_free_dma_buffers,
 234 };
 235
 236 static int mmp_pcm_probe(struct platform_device *pdev)
 237 {
 238         struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
 239
 240         if (pdata) {
 241                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
 242                                                 pdata->buffer_max_playback;
 243                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
 244                                                 pdata->period_max_playback;
 245                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
 246                                                 pdata->buffer_max_capture;
 247                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
 248                                                 pdata->period_max_capture;
 249         }
 250         return devm_snd_soc_register_component(&pdev->dev, &mmp_soc_component,
 251                                                NULL, 0);
 252 }
 253
 254 static struct platform_driver mmp_pcm_driver = {
 255         .driver = {
 256                 .name = "mmp-pcm-audio",
 257         },
 258
 259         .probe = mmp_pcm_probe,
 260 };
 261
 262 module_platform_driver(mmp_pcm_driver);
 263
 264 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 265 MODULE_DESCRIPTION("MMP Soc Audio DMA module");
 266 MODULE_LICENSE("GPL");
 267 MODULE_ALIAS("platform:mmp-pcm-audio");