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