sound/soc/s6000/s6000-pcm.c

   1 /*
   2  * ALSA PCM interface for the Stetch s6000 family
   3  *
   4  * Author:      Daniel Gloeckner, <dg@emlix.com>
   5  * Copyright:   (C) 2009 emlix GmbH <info@emlix.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/interrupt.h>
  18
  19 #include <sound/core.h>
  20 #include <sound/pcm.h>
  21 #include <sound/pcm_params.h>
  22 #include <sound/soc.h>
  23
  24 #include <asm/dma.h>
  25 #include <variant/dmac.h>
  26
  27 #include "s6000-pcm.h"
  28
  29 #define S6_PCM_PREALLOCATE_SIZE (96 * 1024)
  30 #define S6_PCM_PREALLOCATE_MAX  (2048 * 1024)
  31
  32 static struct snd_pcm_hardware s6000_pcm_hardware = {
  33         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  34                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  35                  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_JOINT_DUPLEX),
  36         .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE),
  37         .rates = (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
  38                   SNDRV_PCM_RATE_8000_192000),
  39         .rate_min = 0,
  40         .rate_max = 1562500,
  41         .channels_min = 2,
  42         .channels_max = 8,
  43         .buffer_bytes_max = 0x7ffffff0,
  44         .period_bytes_min = 16,
  45         .period_bytes_max = 0xfffff0,
  46         .periods_min = 2,
  47         .periods_max = 1024, /* no limit */
  48         .fifo_size = 0,
  49 };
  50
  51 struct s6000_runtime_data {
  52         spinlock_t lock;
  53         int period;             /* current DMA period */
  54 };
  55
  56 static void s6000_pcm_enqueue_dma(struct snd_pcm_substream *substream)
  57 {
  58         struct snd_pcm_runtime *runtime = substream->runtime;
  59         struct s6000_runtime_data *prtd = runtime->private_data;
  60         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
  61         struct s6000_pcm_dma_params *par;
  62         int channel;
  63         unsigned int period_size;
  64         unsigned int dma_offset;
  65         dma_addr_t dma_pos;
  66         dma_addr_t src, dst;
  67
  68         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
  69
  70         period_size = snd_pcm_lib_period_bytes(substream);
  71         dma_offset = prtd->period * period_size;
  72         dma_pos = runtime->dma_addr + dma_offset;
  73
  74         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  75                 src = dma_pos;
  76                 dst = par->sif_out;
  77                 channel = par->dma_out;
  78         } else {
  79                 src = par->sif_in;
  80                 dst = dma_pos;
  81                 channel = par->dma_in;
  82         }
  83
  84         if (!s6dmac_channel_enabled(DMA_MASK_DMAC(channel),
  85                                     DMA_INDEX_CHNL(channel)))
  86                 return;
  87
  88         if (s6dmac_fifo_full(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel))) {
  89                 printk(KERN_ERR "s6000-pcm: fifo full\n");
  90                 return;
  91         }
  92
  93         if (WARN_ON(period_size & 15))
  94                 return;
  95         s6dmac_put_fifo(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel),
  96                         src, dst, period_size);
  97
  98         prtd->period++;
  99         if (unlikely(prtd->period >= runtime->periods))
 100                 prtd->period = 0;
 101 }
 102
 103 static irqreturn_t s6000_pcm_irq(int irq, void *data)
 104 {
 105         struct snd_pcm *pcm = data;
 106         struct snd_soc_pcm_runtime *runtime = pcm->private_data;
 107         struct s6000_runtime_data *prtd;
 108         unsigned int has_xrun;
 109         int i, ret = IRQ_NONE;
 110
 111         for (i = 0; i < 2; ++i) {
 112                 struct snd_pcm_substream *substream = pcm->streams[i].substream;
 113                 struct s6000_pcm_dma_params *params =
 114                                         snd_soc_dai_get_dma_data(runtime->cpu_dai, substream);
 115                 u32 channel;
 116                 unsigned int pending;
 117
 118                 if (substream == SNDRV_PCM_STREAM_PLAYBACK)
 119                         channel = params->dma_out;
 120                 else
 121                         channel = params->dma_in;
 122
 123                 has_xrun = params->check_xrun(runtime->cpu_dai);
 124
 125                 if (!channel)
 126                         continue;
 127
 128                 if (unlikely(has_xrun & (1 << i)) &&
 129                     substream->runtime &&
 130                     snd_pcm_running(substream)) {
 131                         dev_dbg(pcm->dev, "xrun\n");
 132                         snd_pcm_stream_lock(substream);
 133                         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 134                         snd_pcm_stream_unlock(substream);
 135                         ret = IRQ_HANDLED;
 136                 }
 137
 138                 pending = s6dmac_int_sources(DMA_MASK_DMAC(channel),
 139                                              DMA_INDEX_CHNL(channel));
 140
 141                 if (pending & 1) {
 142                         ret = IRQ_HANDLED;
 143                         if (likely(substream->runtime &&
 144                                    snd_pcm_running(substream))) {
 145                                 snd_pcm_period_elapsed(substream);
 146                                 dev_dbg(pcm->dev, "period elapsed %x %x\n",
 147                                        s6dmac_cur_src(DMA_MASK_DMAC(channel),
 148                                                    DMA_INDEX_CHNL(channel)),
 149                                        s6dmac_cur_dst(DMA_MASK_DMAC(channel),
 150                                                    DMA_INDEX_CHNL(channel)));
 151                                 prtd = substream->runtime->private_data;
 152                                 spin_lock(&prtd->lock);
 153                                 s6000_pcm_enqueue_dma(substream);
 154                                 spin_unlock(&prtd->lock);
 155                         }
 156                 }
 157
 158                 if (unlikely(pending & ~7)) {
 159                         if (pending & (1 << 3))
 160                                 printk(KERN_WARNING
 161                                        "s6000-pcm: DMA %x Underflow\n",
 162                                        channel);
 163                         if (pending & (1 << 4))
 164                                 printk(KERN_WARNING
 165                                        "s6000-pcm: DMA %x Overflow\n",
 166                                        channel);
 167                         if (pending & 0x1e0)
 168                                 printk(KERN_WARNING
 169                                        "s6000-pcm: DMA %x Master Error "
 170                                        "(mask %x)\n",
 171                                        channel, pending >> 5);
 172
 173                 }
 174         }
 175
 176         return ret;
 177 }
 178
 179 static int s6000_pcm_start(struct snd_pcm_substream *substream)
 180 {
 181         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 182         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 183         struct s6000_pcm_dma_params *par;
 184         unsigned long flags;
 185         int srcinc;
 186         u32 dma;
 187
 188         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 189
 190         spin_lock_irqsave(&prtd->lock, flags);
 191
 192         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 193                 srcinc = 1;
 194                 dma = par->dma_out;
 195         } else {
 196                 srcinc = 0;
 197                 dma = par->dma_in;
 198         }
 199         s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma),
 200                            1 /* priority 1 (0 is max) */,
 201                            0 /* peripheral requests w/o xfer length mode */,
 202                            srcinc /* source address increment */,
 203                            srcinc^1 /* destination address increment */,
 204                            0 /* chunksize 0 (skip impossible on this dma) */,
 205                            0 /* source skip after chunk (impossible) */,
 206                            0 /* destination skip after chunk (impossible) */,
 207                            4 /* 16 byte burst size */,
 208                            -1 /* don't conserve bandwidth */,
 209                            0 /* low watermark irq descriptor threshold */,
 210                            0 /* disable hardware timestamps */,
 211                            1 /* enable channel */);
 212
 213         s6000_pcm_enqueue_dma(substream);
 214         s6000_pcm_enqueue_dma(substream);
 215
 216         spin_unlock_irqrestore(&prtd->lock, flags);
 217
 218         return 0;
 219 }
 220
 221 static int s6000_pcm_stop(struct snd_pcm_substream *substream)
 222 {
 223         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 224         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 225         struct s6000_pcm_dma_params *par;
 226         unsigned long flags;
 227         u32 channel;
 228
 229         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 230
 231         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 232                 channel = par->dma_out;
 233         else
 234                 channel = par->dma_in;
 235
 236         s6dmac_set_terminal_count(DMA_MASK_DMAC(channel),
 237                                   DMA_INDEX_CHNL(channel), 0);
 238
 239         spin_lock_irqsave(&prtd->lock, flags);
 240
 241         s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel));
 242
 243         spin_unlock_irqrestore(&prtd->lock, flags);
 244
 245         return 0;
 246 }
 247
 248 static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 249 {
 250         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 251         struct s6000_pcm_dma_params *par;
 252         int ret;
 253
 254         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 255
 256         ret = par->trigger(substream, cmd, 0);
 257         if (ret < 0)
 258                 return ret;
 259
 260         switch (cmd) {
 261         case SNDRV_PCM_TRIGGER_START:
 262         case SNDRV_PCM_TRIGGER_RESUME:
 263         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 264                 ret = s6000_pcm_start(substream);
 265                 break;
 266         case SNDRV_PCM_TRIGGER_STOP:
 267         case SNDRV_PCM_TRIGGER_SUSPEND:
 268         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 269                 ret = s6000_pcm_stop(substream);
 270                 break;
 271         default:
 272                 ret = -EINVAL;
 273         }
 274         if (ret < 0)
 275                 return ret;
 276
 277         return par->trigger(substream, cmd, 1);
 278 }
 279
 280 static int s6000_pcm_prepare(struct snd_pcm_substream *substream)
 281 {
 282         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 283
 284         prtd->period = 0;
 285
 286         return 0;
 287 }
 288
 289 static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream)
 290 {
 291         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 292         struct s6000_pcm_dma_params *par;
 293         struct snd_pcm_runtime *runtime = substream->runtime;
 294         struct s6000_runtime_data *prtd = runtime->private_data;
 295         unsigned long flags;
 296         unsigned int offset;
 297         dma_addr_t count;
 298
 299         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 300
 301         spin_lock_irqsave(&prtd->lock, flags);
 302
 303         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 304                 count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out),
 305                                        DMA_INDEX_CHNL(par->dma_out));
 306         else
 307                 count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in),
 308                                        DMA_INDEX_CHNL(par->dma_in));
 309
 310         count -= runtime->dma_addr;
 311
 312         spin_unlock_irqrestore(&prtd->lock, flags);
 313
 314         offset = bytes_to_frames(runtime, count);
 315         if (unlikely(offset >= runtime->buffer_size))
 316                 offset = 0;
 317
 318         return offset;
 319 }
 320
 321 static int s6000_pcm_open(struct snd_pcm_substream *substream)
 322 {
 323         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 324         struct s6000_pcm_dma_params *par;
 325         struct snd_pcm_runtime *runtime = substream->runtime;
 326         struct s6000_runtime_data *prtd;
 327         int ret;
 328
 329         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 330         snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware);
 331
 332         ret = snd_pcm_hw_constraint_step(runtime, 0,
 333                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16);
 334         if (ret < 0)
 335                 return ret;
 336         ret = snd_pcm_hw_constraint_step(runtime, 0,
 337                                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16);
 338         if (ret < 0)
 339                 return ret;
 340         ret = snd_pcm_hw_constraint_integer(runtime,
 341                                             SNDRV_PCM_HW_PARAM_PERIODS);
 342         if (ret < 0)
 343                 return ret;
 344
 345         if (par->same_rate) {
 346                 int rate;
 347                 spin_lock(&par->lock); /* needed? */
 348                 rate = par->rate;
 349                 spin_unlock(&par->lock);
 350                 if (rate != -1) {
 351                         ret = snd_pcm_hw_constraint_minmax(runtime,
 352                                                         SNDRV_PCM_HW_PARAM_RATE,
 353                                                         rate, rate);
 354                         if (ret < 0)
 355                                 return ret;
 356                 }
 357         }
 358
 359         prtd = kzalloc(sizeof(struct s6000_runtime_data), GFP_KERNEL);
 360         if (prtd == NULL)
 361                 return -ENOMEM;
 362
 363         spin_lock_init(&prtd->lock);
 364
 365         runtime->private_data = prtd;
 366
 367         return 0;
 368 }
 369
 370 static int s6000_pcm_close(struct snd_pcm_substream *substream)
 371 {
 372         struct snd_pcm_runtime *runtime = substream->runtime;
 373         struct s6000_runtime_data *prtd = runtime->private_data;
 374
 375         kfree(prtd);
 376
 377         return 0;
 378 }
 379
 380 static int s6000_pcm_hw_params(struct snd_pcm_substream *substream,
 381                                  struct snd_pcm_hw_params *hw_params)
 382 {
 383         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 384         struct s6000_pcm_dma_params *par;
 385         int ret;
 386         ret = snd_pcm_lib_malloc_pages(substream,
 387                                        params_buffer_bytes(hw_params));
 388         if (ret < 0) {
 389                 printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n");
 390                 return ret;
 391         }
 392
 393         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 394
 395         if (par->same_rate) {
 396                 spin_lock(&par->lock);
 397                 if (par->rate == -1 ||
 398                     !(par->in_use & ~(1 << substream->stream))) {
 399                         par->rate = params_rate(hw_params);
 400                         par->in_use |= 1 << substream->stream;
 401                 } else if (params_rate(hw_params) != par->rate) {
 402                         snd_pcm_lib_free_pages(substream);
 403                         par->in_use &= ~(1 << substream->stream);
 404                         ret = -EBUSY;
 405                 }
 406                 spin_unlock(&par->lock);
 407         }
 408         return ret;
 409 }
 410
 411 static int s6000_pcm_hw_free(struct snd_pcm_substream *substream)
 412 {
 413         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 414         struct s6000_pcm_dma_params *par =
 415                 snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 416
 417         spin_lock(&par->lock);
 418         par->in_use &= ~(1 << substream->stream);
 419         if (!par->in_use)
 420                 par->rate = -1;
 421         spin_unlock(&par->lock);
 422
 423         return snd_pcm_lib_free_pages(substream);
 424 }
 425
 426 static struct snd_pcm_ops s6000_pcm_ops = {
 427         .open =         s6000_pcm_open,
 428         .close =        s6000_pcm_close,
 429         .ioctl =        snd_pcm_lib_ioctl,
 430         .hw_params =    s6000_pcm_hw_params,
 431         .hw_free =      s6000_pcm_hw_free,
 432         .trigger =      s6000_pcm_trigger,
 433         .prepare =      s6000_pcm_prepare,
 434         .pointer =      s6000_pcm_pointer,
 435 };
 436
 437 static void s6000_pcm_free(struct snd_pcm *pcm)
 438 {
 439         struct snd_soc_pcm_runtime *runtime = pcm->private_data;
 440         struct s6000_pcm_dma_params *params =
 441                 snd_soc_dai_get_dma_data(runtime->cpu_dai,
 442                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream);
 443
 444         free_irq(params->irq, pcm);
 445         snd_pcm_lib_preallocate_free_for_all(pcm);
 446 }
 447
 448 static int s6000_pcm_new(struct snd_soc_pcm_runtime *runtime)
 449 {
 450         struct snd_card *card = runtime->card->snd_card;
 451         struct snd_pcm *pcm = runtime->pcm;
 452         struct s6000_pcm_dma_params *params;
 453         int res;
 454
 455         params = snd_soc_dai_get_dma_data(runtime->cpu_dai,
 456                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream);
 457
 458         res = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 459         if (res)
 460                 return res;
 461
 462         if (params->dma_in) {
 463                 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in),
 464                                     DMA_INDEX_CHNL(params->dma_in));
 465                 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in),
 466                                    DMA_INDEX_CHNL(params->dma_in));
 467         }
 468
 469         if (params->dma_out) {
 470                 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out),
 471                                     DMA_INDEX_CHNL(params->dma_out));
 472                 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out),
 473                                    DMA_INDEX_CHNL(params->dma_out));
 474         }
 475
 476         res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED,
 477                           "s6000-audio", pcm);
 478         if (res) {
 479                 printk(KERN_ERR "s6000-pcm couldn't get IRQ\n");
 480                 return res;
 481         }
 482
 483         res = snd_pcm_lib_preallocate_pages_for_all(pcm,
 484                                                     SNDRV_DMA_TYPE_DEV,
 485                                                     card->dev,
 486                                                     S6_PCM_PREALLOCATE_SIZE,
 487                                                     S6_PCM_PREALLOCATE_MAX);
 488         if (res)
 489                 printk(KERN_WARNING "s6000-pcm: preallocation failed\n");
 490
 491         spin_lock_init(&params->lock);
 492         params->in_use = 0;
 493         params->rate = -1;
 494         return 0;
 495 }
 496
 497 static struct snd_soc_platform_driver s6000_soc_platform = {
 498         .ops =          &s6000_pcm_ops,
 499         .pcm_new =      s6000_pcm_new,
 500         .pcm_free =     s6000_pcm_free,
 501 };
 502
 503 static int s6000_soc_platform_probe(struct platform_device *pdev)
 504 {
 505         return snd_soc_register_platform(&pdev->dev, &s6000_soc_platform);
 506 }
 507
 508 static int s6000_soc_platform_remove(struct platform_device *pdev)
 509 {
 510         snd_soc_unregister_platform(&pdev->dev);
 511         return 0;
 512 }
 513
 514 static struct platform_driver s6000_pcm_driver = {
 515         .driver = {
 516                         .name = "s6000-pcm-audio",
 517                         .owner = THIS_MODULE,
 518         },
 519
 520         .probe = s6000_soc_platform_probe,
 521         .remove = s6000_soc_platform_remove,
 522 };
 523
 524 module_platform_driver(s6000_pcm_driver);
 525
 526 MODULE_AUTHOR("Daniel Gloeckner");
 527 MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module");
 528 MODULE_LICENSE("GPL");