sound/soc/s3c24xx/s3c24xx-pcm.c

   1 /*
   2  * s3c24xx-pcm.c  --  ALSA Soc Audio Layer
   3  *
   4  * (c) 2006 Wolfson Microelectronics PLC.
   5  * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
   6  *
   7  * (c) 2004-2005 Simtec Electronics
   8  *      http://armlinux.simtec.co.uk/
   9  *      Ben Dooks <ben@simtec.co.uk>
  10  *
  11  *  This program is free software; you can redistribute  it and/or modify it
  12  *  under  the terms of  the GNU General  Public License as published by the
  13  *  Free Software Foundation;  either version 2 of the  License, or (at your
  14  *  option) any later version.
  15  *
  16  *  Revision history
  17  *    11th Dec 2006   Merged with Simtec driver
  18  *    10th Nov 2006   Initial version.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/slab.h>
  25 #include <linux/dma-mapping.h>
  26
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/soc.h>
  31
  32 #include <asm/dma.h>
  33 #include <asm/io.h>
  34 #include <asm/hardware.h>
  35 #include <asm/arch/dma.h>
  36 #include <asm/arch/audio.h>
  37
  38 #include "s3c24xx-pcm.h"
  39
  40 #define S3C24XX_PCM_DEBUG 0
  41 #if S3C24XX_PCM_DEBUG
  42 #define DBG(x...) printk(KERN_DEBUG x)
  43 #else
  44 #define DBG(x...)
  45 #endif
  46
  47 static const struct snd_pcm_hardware s3c24xx_pcm_hardware = {
  48         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
  49                                     SNDRV_PCM_INFO_BLOCK_TRANSFER |
  50                                     SNDRV_PCM_INFO_MMAP |
  51                                     SNDRV_PCM_INFO_MMAP_VALID |
  52                                     SNDRV_PCM_INFO_PAUSE |
  53                                     SNDRV_PCM_INFO_RESUME,
  54         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  55                                     SNDRV_PCM_FMTBIT_U16_LE |
  56                                     SNDRV_PCM_FMTBIT_U8 |
  57                                     SNDRV_PCM_FMTBIT_S8,
  58         .channels_min           = 2,
  59         .channels_max           = 2,
  60         .buffer_bytes_max       = 128*1024,
  61         .period_bytes_min       = PAGE_SIZE,
  62         .period_bytes_max       = PAGE_SIZE*2,
  63         .periods_min            = 2,
  64         .periods_max            = 128,
  65         .fifo_size              = 32,
  66 };
  67
  68 struct s3c24xx_runtime_data {
  69         spinlock_t lock;
  70         int state;
  71         unsigned int dma_loaded;
  72         unsigned int dma_limit;
  73         unsigned int dma_period;
  74         dma_addr_t dma_start;
  75         dma_addr_t dma_pos;
  76         dma_addr_t dma_end;
  77         struct s3c24xx_pcm_dma_params *params;
  78 };
  79
  80 /* s3c24xx_pcm_enqueue
  81  *
  82  * place a dma buffer onto the queue for the dma system
  83  * to handle.
  84 */
  85 static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream)
  86 {
  87         struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
  88         dma_addr_t pos = prtd->dma_pos;
  89         int ret;
  90
  91         DBG("Entered %s\n", __FUNCTION__);
  92
  93         while (prtd->dma_loaded < prtd->dma_limit) {
  94                 unsigned long len = prtd->dma_period;
  95
  96                 DBG("dma_loaded: %d\n",prtd->dma_loaded);
  97
  98                 if ((pos + len) > prtd->dma_end) {
  99                         len  = prtd->dma_end - pos;
 100                         DBG(KERN_DEBUG "%s: corrected dma len %ld\n",
 101                                __FUNCTION__, len);
 102                 }
 103
 104                 ret = s3c2410_dma_enqueue(prtd->params->channel,
 105                         substream, pos, len);
 106
 107                 if (ret == 0) {
 108                         prtd->dma_loaded++;
 109                         pos += prtd->dma_period;
 110                         if (pos >= prtd->dma_end)
 111                                 pos = prtd->dma_start;
 112                 } else
 113                         break;
 114         }
 115
 116         prtd->dma_pos = pos;
 117 }
 118
 119 static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
 120                                 void *dev_id, int size,
 121                                 enum s3c2410_dma_buffresult result)
 122 {
 123         struct snd_pcm_substream *substream = dev_id;
 124         struct s3c24xx_runtime_data *prtd;
 125
 126         DBG("Entered %s\n", __FUNCTION__);
 127
 128         if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
 129                 return;
 130
 131         prtd = substream->runtime->private_data;
 132
 133         if (substream)
 134                 snd_pcm_period_elapsed(substream);
 135
 136         spin_lock(&prtd->lock);
 137         if (prtd->state & ST_RUNNING) {
 138                 prtd->dma_loaded--;
 139                 s3c24xx_pcm_enqueue(substream);
 140         }
 141
 142         spin_unlock(&prtd->lock);
 143 }
 144
 145 static int s3c24xx_pcm_hw_params(struct snd_pcm_substream *substream,
 146         struct snd_pcm_hw_params *params)
 147 {
 148         struct snd_pcm_runtime *runtime = substream->runtime;
 149         struct s3c24xx_runtime_data *prtd = runtime->private_data;
 150         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 151         struct s3c24xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
 152         unsigned long totbytes = params_buffer_bytes(params);
 153         int ret=0;
 154
 155         DBG("Entered %s\n", __FUNCTION__);
 156
 157         /* return if this is a bufferless transfer e.g.
 158          * codec <--> BT codec or GSM modem -- lg FIXME */
 159         if (!dma)
 160                 return 0;
 161
 162         /* this may get called several times by oss emulation
 163          * with different params -HW */
 164         if (prtd->params == NULL) {
 165                 /* prepare DMA */
 166                 prtd->params = dma;
 167
 168                 DBG("params %p, client %p, channel %d\n", prtd->params,
 169                         prtd->params->client, prtd->params->channel);
 170
 171                 ret = s3c2410_dma_request(prtd->params->channel,
 172                                           prtd->params->client, NULL);
 173
 174                 if (ret) {
 175                         DBG(KERN_ERR "failed to get dma channel\n");
 176                         return ret;
 177                 }
 178         }
 179
 180         s3c2410_dma_set_buffdone_fn(prtd->params->channel,
 181                                     s3c24xx_audio_buffdone);
 182
 183         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 184
 185         runtime->dma_bytes = totbytes;
 186
 187         spin_lock_irq(&prtd->lock);
 188         prtd->dma_loaded = 0;
 189         prtd->dma_limit = runtime->hw.periods_min;
 190         prtd->dma_period = params_period_bytes(params);
 191         prtd->dma_start = runtime->dma_addr;
 192         prtd->dma_pos = prtd->dma_start;
 193         prtd->dma_end = prtd->dma_start + totbytes;
 194         spin_unlock_irq(&prtd->lock);
 195
 196         return 0;
 197 }
 198
 199 static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream)
 200 {
 201         struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
 202
 203         DBG("Entered %s\n", __FUNCTION__);
 204
 205         /* TODO - do we need to ensure DMA flushed */
 206         snd_pcm_set_runtime_buffer(substream, NULL);
 207
 208         if (prtd->params) {
 209                 s3c2410_dma_free(prtd->params->channel, prtd->params->client);
 210                 prtd->params = NULL;
 211         }
 212
 213         return 0;
 214 }
 215
 216 static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
 217 {
 218         struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
 219         int ret = 0;
 220
 221         DBG("Entered %s\n", __FUNCTION__);
 222
 223         /* return if this is a bufferless transfer e.g.
 224          * codec <--> BT codec or GSM modem -- lg FIXME */
 225         if (!prtd->params)
 226                 return 0;
 227
 228         /* channel needs configuring for mem=>device, increment memory addr,
 229          * sync to pclk, half-word transfers to the IIS-FIFO. */
 230         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 231                 s3c2410_dma_devconfig(prtd->params->channel,
 232                                 S3C2410_DMASRC_MEM, S3C2410_DISRCC_INC |
 233                                 S3C2410_DISRCC_APB, prtd->params->dma_addr);
 234
 235                 s3c2410_dma_config(prtd->params->channel,
 236                                 prtd->params->dma_size,
 237                                 S3C2410_DCON_SYNC_PCLK |
 238                                 S3C2410_DCON_HANDSHAKE);
 239         } else {
 240                 s3c2410_dma_config(prtd->params->channel,
 241                                 prtd->params->dma_size,
 242                                 S3C2410_DCON_HANDSHAKE |
 243                                 S3C2410_DCON_SYNC_PCLK);
 244
 245                 s3c2410_dma_devconfig(prtd->params->channel,
 246                                         S3C2410_DMASRC_HW, 0x3,
 247                                         prtd->params->dma_addr);
 248         }
 249
 250         /* flush the DMA channel */
 251         s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
 252         prtd->dma_loaded = 0;
 253         prtd->dma_pos = prtd->dma_start;
 254
 255         /* enqueue dma buffers */
 256         s3c24xx_pcm_enqueue(substream);
 257
 258         return ret;
 259 }
 260
 261 static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 262 {
 263         struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
 264         int ret = 0;
 265
 266         DBG("Entered %s\n", __FUNCTION__);
 267
 268         spin_lock(&prtd->lock);
 269
 270         switch (cmd) {
 271         case SNDRV_PCM_TRIGGER_START:
 272         case SNDRV_PCM_TRIGGER_RESUME:
 273         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 274                 prtd->state |= ST_RUNNING;
 275                 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
 276                 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED);
 277                 break;
 278
 279         case SNDRV_PCM_TRIGGER_STOP:
 280         case SNDRV_PCM_TRIGGER_SUSPEND:
 281         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 282                 prtd->state &= ~ST_RUNNING;
 283                 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
 284                 break;
 285
 286         default:
 287                 ret = -EINVAL;
 288                 break;
 289         }
 290
 291         spin_unlock(&prtd->lock);
 292
 293         return ret;
 294 }
 295
 296 static snd_pcm_uframes_t
 297         s3c24xx_pcm_pointer(struct snd_pcm_substream *substream)
 298 {
 299         struct snd_pcm_runtime *runtime = substream->runtime;
 300         struct s3c24xx_runtime_data *prtd = runtime->private_data;
 301         unsigned long res;
 302         dma_addr_t src, dst;
 303
 304         DBG("Entered %s\n", __FUNCTION__);
 305
 306         spin_lock(&prtd->lock);
 307         s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
 308
 309         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 310                 res = dst - prtd->dma_start;
 311         else
 312                 res = src - prtd->dma_start;
 313
 314         spin_unlock(&prtd->lock);
 315
 316         DBG("Pointer %x %x\n",src,dst);
 317
 318         /* we seem to be getting the odd error from the pcm library due
 319          * to out-of-bounds pointers. this is maybe due to the dma engine
 320          * not having loaded the new values for the channel before being
 321          * callled... (todo - fix )
 322          */
 323
 324         if (res >= snd_pcm_lib_buffer_bytes(substream)) {
 325                 if (res == snd_pcm_lib_buffer_bytes(substream))
 326                         res = 0;
 327         }
 328
 329         return bytes_to_frames(substream->runtime, res);
 330 }
 331
 332 static int s3c24xx_pcm_open(struct snd_pcm_substream *substream)
 333 {
 334         struct snd_pcm_runtime *runtime = substream->runtime;
 335         struct s3c24xx_runtime_data *prtd;
 336
 337         DBG("Entered %s\n", __FUNCTION__);
 338
 339         snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_hardware);
 340
 341         prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
 342         if (prtd == NULL)
 343                 return -ENOMEM;
 344
 345         spin_lock_init(&prtd->lock);
 346
 347         runtime->private_data = prtd;
 348         return 0;
 349 }
 350
 351 static int s3c24xx_pcm_close(struct snd_pcm_substream *substream)
 352 {
 353         struct snd_pcm_runtime *runtime = substream->runtime;
 354         struct s3c24xx_runtime_data *prtd = runtime->private_data;
 355
 356         DBG("Entered %s\n", __FUNCTION__);
 357
 358         if (prtd)
 359                 kfree(prtd);
 360         else
 361                 DBG("s3c24xx_pcm_close called with prtd == NULL\n");
 362
 363         return 0;
 364 }
 365
 366 static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream,
 367         struct vm_area_struct *vma)
 368 {
 369         struct snd_pcm_runtime *runtime = substream->runtime;
 370
 371         DBG("Entered %s\n", __FUNCTION__);
 372
 373         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 374                                      runtime->dma_area,
 375                                      runtime->dma_addr,
 376                                      runtime->dma_bytes);
 377 }
 378
 379 static struct snd_pcm_ops s3c24xx_pcm_ops = {
 380         .open           = s3c24xx_pcm_open,
 381         .close          = s3c24xx_pcm_close,
 382         .ioctl          = snd_pcm_lib_ioctl,
 383         .hw_params      = s3c24xx_pcm_hw_params,
 384         .hw_free        = s3c24xx_pcm_hw_free,
 385         .prepare        = s3c24xx_pcm_prepare,
 386         .trigger        = s3c24xx_pcm_trigger,
 387         .pointer        = s3c24xx_pcm_pointer,
 388         .mmap           = s3c24xx_pcm_mmap,
 389 };
 390
 391 static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 392 {
 393         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 394         struct snd_dma_buffer *buf = &substream->dma_buffer;
 395         size_t size = s3c24xx_pcm_hardware.buffer_bytes_max;
 396
 397         DBG("Entered %s\n", __FUNCTION__);
 398
 399         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 400         buf->dev.dev = pcm->card->dev;
 401         buf->private_data = NULL;
 402         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 403                                            &buf->addr, GFP_KERNEL);
 404         if (!buf->area)
 405                 return -ENOMEM;
 406         buf->bytes = size;
 407         return 0;
 408 }
 409
 410 static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 411 {
 412         struct snd_pcm_substream *substream;
 413         struct snd_dma_buffer *buf;
 414         int stream;
 415
 416         DBG("Entered %s\n", __FUNCTION__);
 417
 418         for (stream = 0; stream < 2; stream++) {
 419                 substream = pcm->streams[stream].substream;
 420                 if (!substream)
 421                         continue;
 422
 423                 buf = &substream->dma_buffer;
 424                 if (!buf->area)
 425                         continue;
 426
 427                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 428                                       buf->area, buf->addr);
 429                 buf->area = NULL;
 430         }
 431 }
 432
 433 static u64 s3c24xx_pcm_dmamask = DMA_32BIT_MASK;
 434
 435 static int s3c24xx_pcm_new(struct snd_card *card,
 436         struct snd_soc_codec_dai *dai, struct snd_pcm *pcm)
 437 {
 438         int ret = 0;
 439
 440         DBG("Entered %s\n", __FUNCTION__);
 441
 442         if (!card->dev->dma_mask)
 443                 card->dev->dma_mask = &s3c24xx_pcm_dmamask;
 444         if (!card->dev->coherent_dma_mask)
 445                 card->dev->coherent_dma_mask = 0xffffffff;
 446
 447         if (dai->playback.channels_min) {
 448                 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
 449                         SNDRV_PCM_STREAM_PLAYBACK);
 450                 if (ret)
 451                         goto out;
 452         }
 453
 454         if (dai->capture.channels_min) {
 455                 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
 456                         SNDRV_PCM_STREAM_CAPTURE);
 457                 if (ret)
 458                         goto out;
 459         }
 460  out:
 461         return ret;
 462 }
 463
 464 struct snd_soc_platform s3c24xx_soc_platform = {
 465         .name           = "s3c24xx-audio",
 466         .pcm_ops        = &s3c24xx_pcm_ops,
 467         .pcm_new        = s3c24xx_pcm_new,
 468         .pcm_free       = s3c24xx_pcm_free_dma_buffers,
 469 };
 470
 471 EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
 472
 473 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 474 MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
 475 MODULE_LICENSE("GPL");