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