linux/sound/soc/blackfin/bf5xx-ac97-pcm.c
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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/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
  45static 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)
  55static 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
  80static 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 */
 102static 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
 118static 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
 129static 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
 149static 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
 181static 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
 220static 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
 242static 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)
 271static 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
 282static  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
 301static 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
 316static 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
 378static 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
 417static 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
 445static 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
 451static int bf5xx_soc_platform_probe(struct platform_device *pdev)
 452{
 453        return snd_soc_register_platform(&pdev->dev, &bf5xx_ac97_soc_platform);
 454}
 455
 456static int bf5xx_soc_platform_remove(struct platform_device *pdev)
 457{
 458        snd_soc_unregister_platform(&pdev->dev);
 459        return 0;
 460}
 461
 462static struct platform_driver bf5xx_pcm_driver = {
 463        .driver = {
 464                        .name = "bfin-ac97-pcm-audio",
 465        },
 466
 467        .probe = bf5xx_soc_platform_probe,
 468        .remove = bf5xx_soc_platform_remove,
 469};
 470
 471module_platform_driver(bf5xx_pcm_driver);
 472
 473MODULE_AUTHOR("Cliff Cai");
 474MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
 475MODULE_LICENSE("GPL");
 476