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   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/slab.h>
  33 #include <linux/dma-mapping.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 #if defined(CONFIG_SND_MMAP_SUPPORT)
  47 static void bf5xx_mmap_copy(struct snd_pcm_substream *substream,
  48          snd_pcm_uframes_t count)
  49 {
  50         struct snd_pcm_runtime *runtime = substream->runtime;
  51         struct sport_device *sport = runtime->private_data;
  52         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  53                 bf5xx_pcm_to_ac97(
  54                         (struct ac97_frame *)sport->tx_dma_buf + sport->tx_pos,
  55                         (__u32 *)runtime->dma_area + sport->tx_pos, count);
  56                 sport->tx_pos += runtime->period_size;
  57                 if (sport->tx_pos >= runtime->buffer_size)
  58                         sport->tx_pos %= runtime->buffer_size;
  59                 sport->tx_delay_pos = sport->tx_pos;
  60         } else {
  61                 bf5xx_ac97_to_pcm(
  62                         (struct ac97_frame *)sport->rx_dma_buf + sport->rx_pos,
  63                         (__u32 *)runtime->dma_area + sport->rx_pos, count);
  64                 sport->rx_pos += runtime->period_size;
  65                 if (sport->rx_pos >= runtime->buffer_size)
  66                         sport->rx_pos %= runtime->buffer_size;
  67         }
  68 }
  69 #endif
  70
  71 static void bf5xx_dma_irq(void *data)
  72 {
  73         struct snd_pcm_substream *pcm = data;
  74 #if defined(CONFIG_SND_MMAP_SUPPORT)
  75         struct snd_pcm_runtime *runtime = pcm->runtime;
  76         struct sport_device *sport = runtime->private_data;
  77         bf5xx_mmap_copy(pcm, runtime->period_size);
  78         if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  79                 if (sport->once == 0) {
  80                         snd_pcm_period_elapsed(pcm);
  81                         bf5xx_mmap_copy(pcm, runtime->period_size);
  82                         sport->once = 1;
  83                 }
  84         }
  85 #endif
  86         snd_pcm_period_elapsed(pcm);
  87 }
  88
  89 /* The memory size for pure pcm data is 128*1024 = 0x20000 bytes.
  90  * The total rx/tx buffer is for ac97 frame to hold all pcm data
  91  * is  0x20000 * sizeof(struct ac97_frame) / 4.
  92  */
  93 #ifdef CONFIG_SND_MMAP_SUPPORT
  94 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
  95         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
  96                                    SNDRV_PCM_INFO_MMAP |
  97                                    SNDRV_PCM_INFO_MMAP_VALID |
  98                                    SNDRV_PCM_INFO_BLOCK_TRANSFER,
  99 #else
 100 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
 101         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
 102                                   SNDRV_PCM_INFO_BLOCK_TRANSFER,
 103 #endif
 104         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 105         .period_bytes_min       = 32,
 106         .period_bytes_max       = 0x10000,
 107         .periods_min            = 1,
 108         .periods_max            = PAGE_SIZE/32,
 109         .buffer_bytes_max       = 0x20000, /* 128 kbytes */
 110         .fifo_size              = 16,
 111 };
 112
 113 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
 114         struct snd_pcm_hw_params *params)
 115 {
 116         size_t size = bf5xx_pcm_hardware.buffer_bytes_max
 117                         * sizeof(struct ac97_frame) / 4;
 118
 119         snd_pcm_lib_malloc_pages(substream, size);
 120
 121         return 0;
 122 }
 123
 124 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
 125 {
 126         struct snd_pcm_runtime *runtime = substream->runtime;
 127
 128         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 129         memset(runtime->dma_area, 0, runtime->buffer_size);
 130         snd_pcm_lib_free_pages(substream);
 131         return 0;
 132 }
 133
 134 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
 135 {
 136         struct snd_pcm_runtime *runtime = substream->runtime;
 137         struct sport_device *sport = runtime->private_data;
 138
 139         /* An intermediate buffer is introduced for implementing mmap for
 140          * SPORT working in TMD mode(include AC97).
 141          */
 142 #if defined(CONFIG_SND_MMAP_SUPPORT)
 143         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 144                 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
 145                 sport_config_tx_dma(sport, sport->tx_dma_buf, runtime->periods,
 146                         runtime->period_size * sizeof(struct ac97_frame));
 147         } else {
 148                 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
 149                 sport_config_rx_dma(sport, sport->rx_dma_buf, runtime->periods,
 150                         runtime->period_size * sizeof(struct ac97_frame));
 151         }
 152 #else
 153         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 154                 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
 155                 sport_config_tx_dma(sport, runtime->dma_area, runtime->periods,
 156                         runtime->period_size * sizeof(struct ac97_frame));
 157         } else {
 158                 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
 159                 sport_config_rx_dma(sport, runtime->dma_area, runtime->periods,
 160                         runtime->period_size * sizeof(struct ac97_frame));
 161         }
 162 #endif
 163         return 0;
 164 }
 165
 166 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 167 {
 168         struct snd_pcm_runtime *runtime = substream->runtime;
 169         struct sport_device *sport = runtime->private_data;
 170         int ret = 0;
 171
 172         pr_debug("%s enter\n", __func__);
 173         switch (cmd) {
 174         case SNDRV_PCM_TRIGGER_START:
 175                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 176                         bf5xx_mmap_copy(substream, runtime->period_size);
 177                         snd_pcm_period_elapsed(substream);
 178                         sport->tx_delay_pos = 0;
 179                         sport_tx_start(sport);
 180                 }
 181                 else
 182                         sport_rx_start(sport);
 183                 break;
 184         case SNDRV_PCM_TRIGGER_STOP:
 185         case SNDRV_PCM_TRIGGER_SUSPEND:
 186         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 187                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 188 #if defined(CONFIG_SND_MMAP_SUPPORT)
 189                         sport->tx_pos = 0;
 190 #endif
 191                         sport_tx_stop(sport);
 192                 } else {
 193 #if defined(CONFIG_SND_MMAP_SUPPORT)
 194                         sport->rx_pos = 0;
 195 #endif
 196                         sport_rx_stop(sport);
 197                 }
 198                 break;
 199         default:
 200                 ret = -EINVAL;
 201         }
 202         return ret;
 203 }
 204
 205 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
 206 {
 207         struct snd_pcm_runtime *runtime = substream->runtime;
 208         struct sport_device *sport = runtime->private_data;
 209         unsigned int curr;
 210
 211 #if defined(CONFIG_SND_MMAP_SUPPORT)
 212         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 213                 curr = sport->tx_delay_pos;
 214         else
 215                 curr = sport->rx_pos;
 216 #else
 217
 218         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 219                 curr = sport_curr_offset_tx(sport) / sizeof(struct ac97_frame);
 220         else
 221                 curr = sport_curr_offset_rx(sport) / sizeof(struct ac97_frame);
 222
 223 #endif
 224         return curr;
 225 }
 226
 227 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
 228 {
 229         struct snd_pcm_runtime *runtime = substream->runtime;
 230         int ret;
 231
 232         pr_debug("%s enter\n", __func__);
 233         snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
 234
 235         ret = snd_pcm_hw_constraint_integer(runtime,
 236                                             SNDRV_PCM_HW_PARAM_PERIODS);
 237         if (ret < 0)
 238                 goto out;
 239
 240         if (sport_handle != NULL)
 241                 runtime->private_data = sport_handle;
 242         else {
 243                 pr_err("sport_handle is NULL\n");
 244                 return -1;
 245         }
 246         return 0;
 247
 248  out:
 249         return ret;
 250 }
 251
 252 static int bf5xx_pcm_close(struct snd_pcm_substream *substream)
 253 {
 254         struct snd_pcm_runtime *runtime = substream->runtime;
 255         struct sport_device *sport = runtime->private_data;
 256
 257         pr_debug("%s enter\n", __func__);
 258         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 259                 sport->once = 0;
 260                 memset(sport->tx_dma_buf, 0, runtime->buffer_size * sizeof(struct ac97_frame));
 261         } else
 262                 memset(sport->rx_dma_buf, 0, runtime->buffer_size * sizeof(struct ac97_frame));
 263
 264         return 0;
 265 }
 266
 267 #ifdef CONFIG_SND_MMAP_SUPPORT
 268 static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
 269         struct vm_area_struct *vma)
 270 {
 271         struct snd_pcm_runtime *runtime = substream->runtime;
 272         size_t size = vma->vm_end - vma->vm_start;
 273         vma->vm_start = (unsigned long)runtime->dma_area;
 274         vma->vm_end = vma->vm_start + size;
 275         vma->vm_flags |=  VM_SHARED;
 276         return 0 ;
 277 }
 278 #else
 279 static  int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
 280                     snd_pcm_uframes_t pos,
 281                     void __user *buf, snd_pcm_uframes_t count)
 282 {
 283         struct snd_pcm_runtime *runtime = substream->runtime;
 284
 285         pr_debug("%s copy pos:0x%lx count:0x%lx\n",
 286                         substream->stream ? "Capture" : "Playback", pos, count);
 287
 288         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 289                 bf5xx_pcm_to_ac97(
 290                                 (struct ac97_frame *)runtime->dma_area + pos,
 291                                 buf, count);
 292         else
 293                 bf5xx_ac97_to_pcm(
 294                                 (struct ac97_frame *)runtime->dma_area + pos,
 295                                 buf, count);
 296         return 0;
 297 }
 298 #endif
 299
 300 struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
 301         .open           = bf5xx_pcm_open,
 302         .close          = bf5xx_pcm_close,
 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 #ifdef CONFIG_SND_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_pcm_substream *substream = pcm->streams[stream].substream;
 319         struct snd_dma_buffer *buf = &substream->dma_buffer;
 320         size_t size = bf5xx_pcm_hardware.buffer_bytes_max
 321                         * sizeof(struct ac97_frame) / 4;
 322
 323         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 324         buf->dev.dev = pcm->card->dev;
 325         buf->private_data = NULL;
 326         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 327                         &buf->addr, GFP_KERNEL);
 328         if (!buf->area) {
 329                 pr_err("Failed to allocate dma memory\n");
 330                 pr_err("Please increase uncached DMA memory region\n");
 331                 return -ENOMEM;
 332         }
 333         buf->bytes = size;
 334
 335         pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
 336                         buf->area, buf->bytes);
 337
 338         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 339                 sport_handle->tx_buf = buf->area;
 340         else
 341                 sport_handle->rx_buf = buf->area;
 342
 343 /*
 344  * Need to allocate local buffer when enable
 345  * MMAP for SPORT working in TMD mode (include AC97).
 346  */
 347 #if defined(CONFIG_SND_MMAP_SUPPORT)
 348         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 349                 if (!sport_handle->tx_dma_buf) {
 350                         sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
 351                                 size, &sport_handle->tx_dma_phy, GFP_KERNEL);
 352                         if (!sport_handle->tx_dma_buf) {
 353                                 pr_err("Failed to allocate memory for tx dma \
 354                                         buf - Please increase uncached DMA \
 355                                         memory region\n");
 356                                 return -ENOMEM;
 357                         } else
 358                                 memset(sport_handle->tx_dma_buf, 0, size);
 359                 } else
 360                         memset(sport_handle->tx_dma_buf, 0, size);
 361         } else {
 362                 if (!sport_handle->rx_dma_buf) {
 363                         sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
 364                                 size, &sport_handle->rx_dma_phy, GFP_KERNEL);
 365                         if (!sport_handle->rx_dma_buf) {
 366                                 pr_err("Failed to allocate memory for rx dma \
 367                                         buf - Please increase uncached DMA \
 368                                         memory region\n");
 369                                 return -ENOMEM;
 370                         } else
 371                                 memset(sport_handle->rx_dma_buf, 0, size);
 372                 } else
 373                         memset(sport_handle->rx_dma_buf, 0, size);
 374         }
 375 #endif
 376         return 0;
 377 }
 378
 379 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 380 {
 381         struct snd_pcm_substream *substream;
 382         struct snd_dma_buffer *buf;
 383         int stream;
 384 #if defined(CONFIG_SND_MMAP_SUPPORT)
 385         size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
 386                 sizeof(struct ac97_frame) / 4;
 387 #endif
 388         for (stream = 0; stream < 2; stream++) {
 389                 substream = pcm->streams[stream].substream;
 390                 if (!substream)
 391                         continue;
 392
 393                 buf = &substream->dma_buffer;
 394                 if (!buf->area)
 395                         continue;
 396                 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
 397                 buf->area = NULL;
 398 #if defined(CONFIG_SND_MMAP_SUPPORT)
 399         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 400                 if (sport_handle->tx_dma_buf)
 401                         dma_free_coherent(NULL, size, \
 402                                 sport_handle->tx_dma_buf, 0);
 403                 sport_handle->tx_dma_buf = NULL;
 404         } else {
 405
 406                 if (sport_handle->rx_dma_buf)
 407                         dma_free_coherent(NULL, size, \
 408                                 sport_handle->rx_dma_buf, 0);
 409                 sport_handle->rx_dma_buf = NULL;
 410         }
 411 #endif
 412         }
 413         if (sport_handle)
 414                 sport_done(sport_handle);
 415 }
 416
 417 static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK;
 418
 419 int bf5xx_pcm_ac97_new(struct snd_card *card, struct snd_soc_dai *dai,
 420         struct snd_pcm *pcm)
 421 {
 422         int ret = 0;
 423
 424         pr_debug("%s enter\n", __func__);
 425         if (!card->dev->dma_mask)
 426                 card->dev->dma_mask = &bf5xx_pcm_dmamask;
 427         if (!card->dev->coherent_dma_mask)
 428                 card->dev->coherent_dma_mask = DMA_32BIT_MASK;
 429
 430         if (dai->playback.channels_min) {
 431                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 432                         SNDRV_PCM_STREAM_PLAYBACK);
 433                 if (ret)
 434                         goto out;
 435         }
 436
 437         if (dai->capture.channels_min) {
 438                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 439                         SNDRV_PCM_STREAM_CAPTURE);
 440                 if (ret)
 441                         goto out;
 442         }
 443  out:
 444         return ret;
 445 }
 446
 447 struct snd_soc_platform bf5xx_ac97_soc_platform = {
 448         .name           = "bf5xx-audio",
 449         .pcm_ops        = &bf5xx_pcm_ac97_ops,
 450         .pcm_new        = bf5xx_pcm_ac97_new,
 451         .pcm_free       = bf5xx_pcm_free_dma_buffers,
 452 };
 453 EXPORT_SYMBOL_GPL(bf5xx_ac97_soc_platform);
 454
 455 MODULE_AUTHOR("Cliff Cai");
 456 MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
 457 MODULE_LICENSE("GPL");