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