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