sound/soc/jz4740/jz4740-pcm.c

   1 /*
   2  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
   3  *
   4  *  This program is free software; you can redistribute  it and/or modify it
   5  *  under  the terms of  the GNU General  Public License as published by the
   6  *  Free Software Foundation;  either version 2 of the  License, or (at your
   7  *  option) any later version.
   8  *
   9  *  You should have received a copy of the  GNU General Public License along
  10  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  11  *  675 Mass Ave, Cambridge, MA 02139, USA.
  12  *
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/slab.h>
  21
  22 #include <linux/dma-mapping.h>
  23
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include <sound/soc.h>
  28
  29 #include <asm/mach-jz4740/dma.h>
  30 #include "jz4740-pcm.h"
  31
  32 struct jz4740_runtime_data {
  33         unsigned long dma_period;
  34         dma_addr_t dma_start;
  35         dma_addr_t dma_pos;
  36         dma_addr_t dma_end;
  37
  38         struct jz4740_dma_chan *dma;
  39
  40         dma_addr_t fifo_addr;
  41 };
  42
  43 /* identify hardware playback capabilities */
  44 static const struct snd_pcm_hardware jz4740_pcm_hardware = {
  45         .info = SNDRV_PCM_INFO_MMAP |
  46                 SNDRV_PCM_INFO_MMAP_VALID |
  47                 SNDRV_PCM_INFO_INTERLEAVED |
  48                 SNDRV_PCM_INFO_BLOCK_TRANSFER,
  49         .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8,
  50
  51         .rates                  = SNDRV_PCM_RATE_8000_48000,
  52         .channels_min           = 1,
  53         .channels_max           = 2,
  54         .period_bytes_min       = 16,
  55         .period_bytes_max       = 2 * PAGE_SIZE,
  56         .periods_min            = 2,
  57         .periods_max            = 128,
  58         .buffer_bytes_max       = 128 * 2 * PAGE_SIZE,
  59         .fifo_size              = 32,
  60 };
  61
  62 static void jz4740_pcm_start_transfer(struct jz4740_runtime_data *prtd,
  63         struct snd_pcm_substream *substream)
  64 {
  65         unsigned long count;
  66
  67         if (prtd->dma_pos == prtd->dma_end)
  68                 prtd->dma_pos = prtd->dma_start;
  69
  70         if (prtd->dma_pos + prtd->dma_period > prtd->dma_end)
  71                 count = prtd->dma_end - prtd->dma_pos;
  72         else
  73                 count = prtd->dma_period;
  74
  75         jz4740_dma_disable(prtd->dma);
  76
  77         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  78                 jz4740_dma_set_src_addr(prtd->dma, prtd->dma_pos);
  79                 jz4740_dma_set_dst_addr(prtd->dma, prtd->fifo_addr);
  80         } else {
  81                 jz4740_dma_set_src_addr(prtd->dma, prtd->fifo_addr);
  82                 jz4740_dma_set_dst_addr(prtd->dma, prtd->dma_pos);
  83         }
  84
  85         jz4740_dma_set_transfer_count(prtd->dma, count);
  86
  87         prtd->dma_pos += count;
  88
  89         jz4740_dma_enable(prtd->dma);
  90 }
  91
  92 static void jz4740_pcm_dma_transfer_done(struct jz4740_dma_chan *dma, int err,
  93         void *dev_id)
  94 {
  95         struct snd_pcm_substream *substream = dev_id;
  96         struct snd_pcm_runtime *runtime = substream->runtime;
  97         struct jz4740_runtime_data *prtd = runtime->private_data;
  98
  99         snd_pcm_period_elapsed(substream);
 100
 101         jz4740_pcm_start_transfer(prtd, substream);
 102 }
 103
 104 static int jz4740_pcm_hw_params(struct snd_pcm_substream *substream,
 105         struct snd_pcm_hw_params *params)
 106 {
 107         struct snd_pcm_runtime *runtime = substream->runtime;
 108         struct jz4740_runtime_data *prtd = runtime->private_data;
 109         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 110         struct jz4740_pcm_config *config;
 111
 112         config = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 113
 114         if (!config)
 115                 return 0;
 116
 117         if (!prtd->dma) {
 118                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 119                         prtd->dma = jz4740_dma_request(substream, "PCM Capture");
 120                 else
 121                         prtd->dma = jz4740_dma_request(substream, "PCM Playback");
 122         }
 123
 124         if (!prtd->dma)
 125                 return -EBUSY;
 126
 127         jz4740_dma_configure(prtd->dma, &config->dma_config);
 128         prtd->fifo_addr = config->fifo_addr;
 129
 130         jz4740_dma_set_complete_cb(prtd->dma, jz4740_pcm_dma_transfer_done);
 131
 132         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 133         runtime->dma_bytes = params_buffer_bytes(params);
 134
 135         prtd->dma_period = params_period_bytes(params);
 136         prtd->dma_start = runtime->dma_addr;
 137         prtd->dma_pos = prtd->dma_start;
 138         prtd->dma_end = prtd->dma_start + runtime->dma_bytes;
 139
 140         return 0;
 141 }
 142
 143 static int jz4740_pcm_hw_free(struct snd_pcm_substream *substream)
 144 {
 145         struct jz4740_runtime_data *prtd = substream->runtime->private_data;
 146
 147         snd_pcm_set_runtime_buffer(substream, NULL);
 148         if (prtd->dma) {
 149                 jz4740_dma_free(prtd->dma);
 150                 prtd->dma = NULL;
 151         }
 152
 153         return 0;
 154 }
 155
 156 static int jz4740_pcm_prepare(struct snd_pcm_substream *substream)
 157 {
 158         struct jz4740_runtime_data *prtd = substream->runtime->private_data;
 159
 160         if (!prtd->dma)
 161                 return -EBUSY;
 162
 163         prtd->dma_pos = prtd->dma_start;
 164
 165         return 0;
 166 }
 167
 168 static int jz4740_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 169 {
 170         struct snd_pcm_runtime *runtime = substream->runtime;
 171         struct jz4740_runtime_data *prtd = runtime->private_data;
 172
 173         switch (cmd) {
 174         case SNDRV_PCM_TRIGGER_START:
 175         case SNDRV_PCM_TRIGGER_RESUME:
 176         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 177                 jz4740_pcm_start_transfer(prtd, substream);
 178                 break;
 179         case SNDRV_PCM_TRIGGER_STOP:
 180         case SNDRV_PCM_TRIGGER_SUSPEND:
 181         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 182                 jz4740_dma_disable(prtd->dma);
 183                 break;
 184         default:
 185                 break;
 186         }
 187
 188         return 0;
 189 }
 190
 191 static snd_pcm_uframes_t jz4740_pcm_pointer(struct snd_pcm_substream *substream)
 192 {
 193         struct snd_pcm_runtime *runtime = substream->runtime;
 194         struct jz4740_runtime_data *prtd = runtime->private_data;
 195         unsigned long byte_offset;
 196         snd_pcm_uframes_t offset;
 197         struct jz4740_dma_chan *dma = prtd->dma;
 198
 199         /* prtd->dma_pos points to the end of the current transfer. So by
 200          * subtracting prdt->dma_start we get the offset to the end of the
 201          * current period in bytes. By subtracting the residue of the transfer
 202          * we get the current offset in bytes. */
 203         byte_offset = prtd->dma_pos - prtd->dma_start;
 204         byte_offset -= jz4740_dma_get_residue(dma);
 205
 206         offset = bytes_to_frames(runtime, byte_offset);
 207         if (offset >= runtime->buffer_size)
 208                 offset = 0;
 209
 210         return offset;
 211 }
 212
 213 static int jz4740_pcm_open(struct snd_pcm_substream *substream)
 214 {
 215         struct snd_pcm_runtime *runtime = substream->runtime;
 216         struct jz4740_runtime_data *prtd;
 217
 218         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
 219         if (prtd == NULL)
 220                 return -ENOMEM;
 221
 222         snd_soc_set_runtime_hwparams(substream, &jz4740_pcm_hardware);
 223
 224         runtime->private_data = prtd;
 225
 226         return 0;
 227 }
 228
 229 static int jz4740_pcm_close(struct snd_pcm_substream *substream)
 230 {
 231         struct snd_pcm_runtime *runtime = substream->runtime;
 232         struct jz4740_runtime_data *prtd = runtime->private_data;
 233
 234         kfree(prtd);
 235
 236         return 0;
 237 }
 238
 239 static int jz4740_pcm_mmap(struct snd_pcm_substream *substream,
 240         struct vm_area_struct *vma)
 241 {
 242         return remap_pfn_range(vma, vma->vm_start,
 243                         substream->dma_buffer.addr >> PAGE_SHIFT,
 244                         vma->vm_end - vma->vm_start, vma->vm_page_prot);
 245 }
 246
 247 static struct snd_pcm_ops jz4740_pcm_ops = {
 248         .open           = jz4740_pcm_open,
 249         .close          = jz4740_pcm_close,
 250         .ioctl          = snd_pcm_lib_ioctl,
 251         .hw_params      = jz4740_pcm_hw_params,
 252         .hw_free        = jz4740_pcm_hw_free,
 253         .prepare        = jz4740_pcm_prepare,
 254         .trigger        = jz4740_pcm_trigger,
 255         .pointer        = jz4740_pcm_pointer,
 256         .mmap           = jz4740_pcm_mmap,
 257 };
 258
 259 static int jz4740_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 260 {
 261         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 262         struct snd_dma_buffer *buf = &substream->dma_buffer;
 263         size_t size = jz4740_pcm_hardware.buffer_bytes_max;
 264
 265         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 266         buf->dev.dev = pcm->card->dev;
 267         buf->private_data = NULL;
 268
 269         buf->area = dma_alloc_noncoherent(pcm->card->dev, size,
 270                                           &buf->addr, GFP_KERNEL);
 271         if (!buf->area)
 272                 return -ENOMEM;
 273
 274         buf->bytes = size;
 275
 276         return 0;
 277 }
 278
 279 static void jz4740_pcm_free(struct snd_pcm *pcm)
 280 {
 281         struct snd_pcm_substream *substream;
 282         struct snd_dma_buffer *buf;
 283         int stream;
 284
 285         for (stream = 0; stream < SNDRV_PCM_STREAM_LAST; ++stream) {
 286                 substream = pcm->streams[stream].substream;
 287                 if (!substream)
 288                         continue;
 289
 290                 buf = &substream->dma_buffer;
 291                 if (!buf->area)
 292                         continue;
 293
 294                 dma_free_noncoherent(pcm->card->dev, buf->bytes, buf->area,
 295                                 buf->addr);
 296                 buf->area = NULL;
 297         }
 298 }
 299
 300 static u64 jz4740_pcm_dmamask = DMA_BIT_MASK(32);
 301
 302 static int jz4740_pcm_new(struct snd_soc_pcm_runtime *rtd)
 303 {
 304         struct snd_card *card = rtd->card->snd_card;
 305         struct snd_pcm *pcm = rtd->pcm;
 306         int ret = 0;
 307
 308         if (!card->dev->dma_mask)
 309                 card->dev->dma_mask = &jz4740_pcm_dmamask;
 310
 311         if (!card->dev->coherent_dma_mask)
 312                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 313
 314         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 315                 ret = jz4740_pcm_preallocate_dma_buffer(pcm,
 316                         SNDRV_PCM_STREAM_PLAYBACK);
 317                 if (ret)
 318                         goto err;
 319         }
 320
 321         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 322                 ret = jz4740_pcm_preallocate_dma_buffer(pcm,
 323                         SNDRV_PCM_STREAM_CAPTURE);
 324                 if (ret)
 325                         goto err;
 326         }
 327
 328 err:
 329         return ret;
 330 }
 331
 332 static struct snd_soc_platform_driver jz4740_soc_platform = {
 333                 .ops            = &jz4740_pcm_ops,
 334                 .pcm_new        = jz4740_pcm_new,
 335                 .pcm_free       = jz4740_pcm_free,
 336 };
 337
 338 static int jz4740_pcm_probe(struct platform_device *pdev)
 339 {
 340         return snd_soc_register_platform(&pdev->dev, &jz4740_soc_platform);
 341 }
 342
 343 static int jz4740_pcm_remove(struct platform_device *pdev)
 344 {
 345         snd_soc_unregister_platform(&pdev->dev);
 346         return 0;
 347 }
 348
 349 static struct platform_driver jz4740_pcm_driver = {
 350         .probe = jz4740_pcm_probe,
 351         .remove = jz4740_pcm_remove,
 352         .driver = {
 353                 .name = "jz4740-pcm-audio",
 354                 .owner = THIS_MODULE,
 355         },
 356 };
 357
 358 module_platform_driver(jz4740_pcm_driver);
 359
 360 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 361 MODULE_DESCRIPTION("Ingenic SoC JZ4740 PCM driver");
 362 MODULE_LICENSE("GPL");