sound/soc/blackfin/bf5xx-ac97-pcm.c

   1 /*
   2  * File:         sound/soc/blackfin/bf5xx-ac97-pcm.c
   3  * Author:       Cliff Cai <Cliff.Cai@analog.com>
   4  *
   5  * Created:      Tue June 06 2008
   6  * Description:  DMA Driver for AC97 sound chip
   7  *
   8  * Modified:
   9  *               Copyright 2008 Analog Devices Inc.
  10  *
  11  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, see the file COPYING, or write
  25  * to the Free Software Foundation, Inc.,
  26  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/gfp.h>
  34
  35 #include <sound/core.h>
  36 #include <sound/pcm.h>
  37 #include <sound/pcm_params.h>
  38 #include <sound/soc.h>
  39
  40 #include <asm/dma.h>
  41
  42 #include "bf5xx-ac97-pcm.h"
  43 #include "bf5xx-ac97.h"
  44 #include "bf5xx-sport.h"
  45
  46 static unsigned int ac97_chan_mask[] = {
  47         SP_FL, /* Mono */
  48         SP_STEREO, /* Stereo */
  49         SP_2DOT1, /* 2.1*/
  50         SP_QUAD,/*Quadraquic*/
  51         SP_FL | SP_FR | SP_FC | SP_SL | SP_SR,/*5 channels */
  52         SP_5DOT1, /* 5.1 */
  53 };
  54
  55 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
  56 static void bf5xx_mmap_copy(struct snd_pcm_substream *substream,
  57          snd_pcm_uframes_t count)
  58 {
  59         struct snd_pcm_runtime *runtime = substream->runtime;
  60         struct sport_device *sport = runtime->private_data;
  61         unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
  62         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  63                 bf5xx_pcm_to_ac97((struct ac97_frame *)sport->tx_dma_buf +
  64                 sport->tx_pos, (__u16 *)runtime->dma_area + sport->tx_pos *
  65                 runtime->channels, count, chan_mask);
  66                 sport->tx_pos += runtime->period_size;
  67                 if (sport->tx_pos >= runtime->buffer_size)
  68                         sport->tx_pos %= runtime->buffer_size;
  69                 sport->tx_delay_pos = sport->tx_pos;
  70         } else {
  71                 bf5xx_ac97_to_pcm((struct ac97_frame *)sport->rx_dma_buf +
  72                 sport->rx_pos, (__u16 *)runtime->dma_area + sport->rx_pos *
  73                 runtime->channels, count);
  74                 sport->rx_pos += runtime->period_size;
  75                 if (sport->rx_pos >= runtime->buffer_size)
  76                         sport->rx_pos %= runtime->buffer_size;
  77         }
  78 }
  79 #endif
  80
  81 static void bf5xx_dma_irq(void *data)
  82 {
  83         struct snd_pcm_substream *pcm = data;
  84 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
  85         struct snd_pcm_runtime *runtime = pcm->runtime;
  86         struct sport_device *sport = runtime->private_data;
  87         bf5xx_mmap_copy(pcm, runtime->period_size);
  88         if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  89                 if (sport->once == 0) {
  90                         snd_pcm_period_elapsed(pcm);
  91                         bf5xx_mmap_copy(pcm, runtime->period_size);
  92                         sport->once = 1;
  93                 }
  94         }
  95 #endif
  96         snd_pcm_period_elapsed(pcm);
  97 }
  98
  99 /* The memory size for pure pcm data is 128*1024 = 0x20000 bytes.
 100  * The total rx/tx buffer is for ac97 frame to hold all pcm data
 101  * is  0x20000 * sizeof(struct ac97_frame) / 4.
 102  */
 103 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
 104         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
 105 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 106                                    SNDRV_PCM_INFO_MMAP |
 107                                    SNDRV_PCM_INFO_MMAP_VALID |
 108 #endif
 109                                    SNDRV_PCM_INFO_BLOCK_TRANSFER,
 110
 111         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 112         .period_bytes_min       = 32,
 113         .period_bytes_max       = 0x10000,
 114         .periods_min            = 1,
 115         .periods_max            = PAGE_SIZE/32,
 116         .buffer_bytes_max       = 0x20000, /* 128 kbytes */
 117         .fifo_size              = 16,
 118 };
 119
 120 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
 121         struct snd_pcm_hw_params *params)
 122 {
 123         size_t size = bf5xx_pcm_hardware.buffer_bytes_max
 124                         * sizeof(struct ac97_frame) / 4;
 125
 126         snd_pcm_lib_malloc_pages(substream, size);
 127
 128         return 0;
 129 }
 130
 131 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
 132 {
 133 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 134         struct snd_pcm_runtime *runtime = substream->runtime;
 135         struct sport_device *sport = runtime->private_data;
 136
 137         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 138                 sport->once = 0;
 139                 if (runtime->dma_area)
 140                         memset(runtime->dma_area, 0, runtime->buffer_size);
 141                 memset(sport->tx_dma_buf, 0, runtime->buffer_size *
 142                         sizeof(struct ac97_frame));
 143         } else
 144                 memset(sport->rx_dma_buf, 0, runtime->buffer_size *
 145                         sizeof(struct ac97_frame));
 146 #endif
 147         snd_pcm_lib_free_pages(substream);
 148         return 0;
 149 }
 150
 151 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
 152 {
 153         struct snd_pcm_runtime *runtime = substream->runtime;
 154         struct sport_device *sport = runtime->private_data;
 155
 156         /* An intermediate buffer is introduced for implementing mmap for
 157          * SPORT working in TMD mode(include AC97).
 158          */
 159 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 160         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 161                 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
 162                 sport_config_tx_dma(sport, sport->tx_dma_buf, runtime->periods,
 163                         runtime->period_size * sizeof(struct ac97_frame));
 164         } else {
 165                 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
 166                 sport_config_rx_dma(sport, sport->rx_dma_buf, runtime->periods,
 167                         runtime->period_size * sizeof(struct ac97_frame));
 168         }
 169 #else
 170         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 171                 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
 172                 sport_config_tx_dma(sport, runtime->dma_area, runtime->periods,
 173                         runtime->period_size * sizeof(struct ac97_frame));
 174         } else {
 175                 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
 176                 sport_config_rx_dma(sport, runtime->dma_area, runtime->periods,
 177                         runtime->period_size * sizeof(struct ac97_frame));
 178         }
 179 #endif
 180         return 0;
 181 }
 182
 183 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 184 {
 185         struct snd_pcm_runtime *runtime = substream->runtime;
 186         struct sport_device *sport = runtime->private_data;
 187         int ret = 0;
 188
 189         pr_debug("%s enter\n", __func__);
 190         switch (cmd) {
 191         case SNDRV_PCM_TRIGGER_START:
 192                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 193 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 194                         bf5xx_mmap_copy(substream, runtime->period_size);
 195                         sport->tx_delay_pos = 0;
 196 #endif
 197                         sport_tx_start(sport);
 198                 } else
 199                         sport_rx_start(sport);
 200                 break;
 201         case SNDRV_PCM_TRIGGER_STOP:
 202         case SNDRV_PCM_TRIGGER_SUSPEND:
 203         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 204                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 205 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 206                         sport->tx_pos = 0;
 207 #endif
 208                         sport_tx_stop(sport);
 209                 } else {
 210 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 211                         sport->rx_pos = 0;
 212 #endif
 213                         sport_rx_stop(sport);
 214                 }
 215                 break;
 216         default:
 217                 ret = -EINVAL;
 218         }
 219         return ret;
 220 }
 221
 222 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
 223 {
 224         struct snd_pcm_runtime *runtime = substream->runtime;
 225         struct sport_device *sport = runtime->private_data;
 226         unsigned int curr;
 227
 228 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 229         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 230                 curr = sport->tx_delay_pos;
 231         else
 232                 curr = sport->rx_pos;
 233 #else
 234
 235         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 236                 curr = sport_curr_offset_tx(sport) / sizeof(struct ac97_frame);
 237         else
 238                 curr = sport_curr_offset_rx(sport) / sizeof(struct ac97_frame);
 239
 240 #endif
 241         return curr;
 242 }
 243
 244 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
 245 {
 246         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 247         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 248         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
 249         struct snd_pcm_runtime *runtime = substream->runtime;
 250         int ret;
 251
 252         pr_debug("%s enter\n", __func__);
 253         snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
 254
 255         ret = snd_pcm_hw_constraint_integer(runtime,
 256                                             SNDRV_PCM_HW_PARAM_PERIODS);
 257         if (ret < 0)
 258                 goto out;
 259
 260         if (sport_handle != NULL)
 261                 runtime->private_data = sport_handle;
 262         else {
 263                 pr_err("sport_handle is NULL\n");
 264                 return -1;
 265         }
 266         return 0;
 267
 268  out:
 269         return ret;
 270 }
 271
 272 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 273 static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
 274         struct vm_area_struct *vma)
 275 {
 276         struct snd_pcm_runtime *runtime = substream->runtime;
 277         size_t size = vma->vm_end - vma->vm_start;
 278         vma->vm_start = (unsigned long)runtime->dma_area;
 279         vma->vm_end = vma->vm_start + size;
 280         vma->vm_flags |=  VM_SHARED;
 281         return 0 ;
 282 }
 283 #else
 284 static  int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
 285                     snd_pcm_uframes_t pos,
 286                     void __user *buf, snd_pcm_uframes_t count)
 287 {
 288         struct snd_pcm_runtime *runtime = substream->runtime;
 289         unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
 290         pr_debug("%s copy pos:0x%lx count:0x%lx\n",
 291                         substream->stream ? "Capture" : "Playback", pos, count);
 292
 293         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 294                 bf5xx_pcm_to_ac97((struct ac97_frame *)runtime->dma_area + pos,
 295                         (__u16 *)buf, count, chan_mask);
 296         else
 297                 bf5xx_ac97_to_pcm((struct ac97_frame *)runtime->dma_area + pos,
 298                         (__u16 *)buf, count);
 299         return 0;
 300 }
 301 #endif
 302
 303 static struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
 304         .open           = bf5xx_pcm_open,
 305         .ioctl          = snd_pcm_lib_ioctl,
 306         .hw_params      = bf5xx_pcm_hw_params,
 307         .hw_free        = bf5xx_pcm_hw_free,
 308         .prepare        = bf5xx_pcm_prepare,
 309         .trigger        = bf5xx_pcm_trigger,
 310         .pointer        = bf5xx_pcm_pointer,
 311 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 312         .mmap           = bf5xx_pcm_mmap,
 313 #else
 314         .copy           = bf5xx_pcm_copy,
 315 #endif
 316 };
 317
 318 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 319 {
 320         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
 321         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 322         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
 323         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 324         struct snd_dma_buffer *buf = &substream->dma_buffer;
 325         size_t size = bf5xx_pcm_hardware.buffer_bytes_max
 326                         * sizeof(struct ac97_frame) / 4;
 327
 328         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 329         buf->dev.dev = pcm->card->dev;
 330         buf->private_data = NULL;
 331         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 332                         &buf->addr, GFP_KERNEL);
 333         if (!buf->area) {
 334                 pr_err("Failed to allocate dma memory\n");
 335                 pr_err("Please increase uncached DMA memory region\n");
 336                 return -ENOMEM;
 337         }
 338         buf->bytes = size;
 339
 340         pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
 341                         buf->area, buf->bytes);
 342
 343         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 344                 sport_handle->tx_buf = buf->area;
 345         else
 346                 sport_handle->rx_buf = buf->area;
 347
 348 /*
 349  * Need to allocate local buffer when enable
 350  * MMAP for SPORT working in TMD mode (include AC97).
 351  */
 352 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 353         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 354                 if (!sport_handle->tx_dma_buf) {
 355                         sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
 356                                 size, &sport_handle->tx_dma_phy, GFP_KERNEL);
 357                         if (!sport_handle->tx_dma_buf) {
 358                                 pr_err("Failed to allocate memory for tx dma buf - Please increase uncached DMA memory region\n");
 359                                 return -ENOMEM;
 360                         } else
 361                                 memset(sport_handle->tx_dma_buf, 0, size);
 362                 } else
 363                         memset(sport_handle->tx_dma_buf, 0, size);
 364         } else {
 365                 if (!sport_handle->rx_dma_buf) {
 366                         sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
 367                                 size, &sport_handle->rx_dma_phy, GFP_KERNEL);
 368                         if (!sport_handle->rx_dma_buf) {
 369                                 pr_err("Failed to allocate memory for rx dma buf - Please increase uncached DMA memory region\n");
 370                                 return -ENOMEM;
 371                         } else
 372                                 memset(sport_handle->rx_dma_buf, 0, size);
 373                 } else
 374                         memset(sport_handle->rx_dma_buf, 0, size);
 375         }
 376 #endif
 377         return 0;
 378 }
 379
 380 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 381 {
 382         struct snd_pcm_substream *substream;
 383         struct snd_dma_buffer *buf;
 384         int stream;
 385 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 386         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
 387         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 388         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
 389         size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
 390                 sizeof(struct ac97_frame) / 4;
 391 #endif
 392         for (stream = 0; stream < 2; stream++) {
 393                 substream = pcm->streams[stream].substream;
 394                 if (!substream)
 395                         continue;
 396
 397                 buf = &substream->dma_buffer;
 398                 if (!buf->area)
 399                         continue;
 400                 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
 401                 buf->area = NULL;
 402 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
 403         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 404                 if (sport_handle->tx_dma_buf)
 405                         dma_free_coherent(NULL, size, \
 406                                 sport_handle->tx_dma_buf, 0);
 407                 sport_handle->tx_dma_buf = NULL;
 408         } else {
 409
 410                 if (sport_handle->rx_dma_buf)
 411                         dma_free_coherent(NULL, size, \
 412                                 sport_handle->rx_dma_buf, 0);
 413                 sport_handle->rx_dma_buf = NULL;
 414         }
 415 #endif
 416         }
 417 }
 418
 419 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
 420
 421 static int bf5xx_pcm_ac97_new(struct snd_soc_pcm_runtime *rtd)
 422 {
 423         struct snd_card *card = rtd->card->snd_card;
 424         struct snd_pcm *pcm = rtd->pcm;
 425         int ret = 0;
 426
 427         pr_debug("%s enter\n", __func__);
 428         if (!card->dev->dma_mask)
 429                 card->dev->dma_mask = &bf5xx_pcm_dmamask;
 430         if (!card->dev->coherent_dma_mask)
 431                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 432
 433         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 434                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 435                         SNDRV_PCM_STREAM_PLAYBACK);
 436                 if (ret)
 437                         goto out;
 438         }
 439
 440         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 441                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 442                         SNDRV_PCM_STREAM_CAPTURE);
 443                 if (ret)
 444                         goto out;
 445         }
 446  out:
 447         return ret;
 448 }
 449
 450 static struct snd_soc_platform_driver bf5xx_ac97_soc_platform = {
 451         .ops                    = &bf5xx_pcm_ac97_ops,
 452         .pcm_new        = bf5xx_pcm_ac97_new,
 453         .pcm_free       = bf5xx_pcm_free_dma_buffers,
 454 };
 455
 456 static int bf5xx_soc_platform_probe(struct platform_device *pdev)
 457 {
 458         return snd_soc_register_platform(&pdev->dev, &bf5xx_ac97_soc_platform);
 459 }
 460
 461 static int bf5xx_soc_platform_remove(struct platform_device *pdev)
 462 {
 463         snd_soc_unregister_platform(&pdev->dev);
 464         return 0;
 465 }
 466
 467 static struct platform_driver bf5xx_pcm_driver = {
 468         .driver = {
 469                         .name = "bfin-ac97-pcm-audio",
 470                         .owner = THIS_MODULE,
 471         },
 472
 473         .probe = bf5xx_soc_platform_probe,
 474         .remove = bf5xx_soc_platform_remove,
 475 };
 476
 477 module_platform_driver(bf5xx_pcm_driver);
 478
 479 MODULE_AUTHOR("Cliff Cai");
 480 MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
 481 MODULE_LICENSE("GPL");