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