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         BUG_ON(period_size & 15);
  94         s6dmac_put_fifo(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel),
  95                         src, dst, period_size);
  96
  97         prtd->period++;
  98         if (unlikely(prtd->period >= runtime->periods))
  99                 prtd->period = 0;
 100 }
 101
 102 static irqreturn_t s6000_pcm_irq(int irq, void *data)
 103 {
 104         struct snd_pcm *pcm = data;
 105         struct snd_soc_pcm_runtime *runtime = pcm->private_data;
 106         struct s6000_runtime_data *prtd;
 107         unsigned int has_xrun;
 108         int i, ret = IRQ_NONE;
 109
 110         for (i = 0; i < 2; ++i) {
 111                 struct snd_pcm_substream *substream = pcm->streams[i].substream;
 112                 struct s6000_pcm_dma_params *params =
 113                                         snd_soc_dai_get_dma_data(runtime->cpu_dai, substream);
 114                 u32 channel;
 115                 unsigned int pending;
 116
 117                 if (substream == SNDRV_PCM_STREAM_PLAYBACK)
 118                         channel = params->dma_out;
 119                 else
 120                         channel = params->dma_in;
 121
 122                 has_xrun = params->check_xrun(runtime->cpu_dai);
 123
 124                 if (!channel)
 125                         continue;
 126
 127                 if (unlikely(has_xrun & (1 << i)) &&
 128                     substream->runtime &&
 129                     snd_pcm_running(substream)) {
 130                         dev_dbg(pcm->dev, "xrun\n");
 131                         snd_pcm_stream_lock(substream);
 132                         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 133                         snd_pcm_stream_unlock(substream);
 134                         ret = IRQ_HANDLED;
 135                 }
 136
 137                 pending = s6dmac_int_sources(DMA_MASK_DMAC(channel),
 138                                              DMA_INDEX_CHNL(channel));
 139
 140                 if (pending & 1) {
 141                         ret = IRQ_HANDLED;
 142                         if (likely(substream->runtime &&
 143                                    snd_pcm_running(substream))) {
 144                                 snd_pcm_period_elapsed(substream);
 145                                 dev_dbg(pcm->dev, "period elapsed %x %x\n",
 146                                        s6dmac_cur_src(DMA_MASK_DMAC(channel),
 147                                                    DMA_INDEX_CHNL(channel)),
 148                                        s6dmac_cur_dst(DMA_MASK_DMAC(channel),
 149                                                    DMA_INDEX_CHNL(channel)));
 150                                 prtd = substream->runtime->private_data;
 151                                 spin_lock(&prtd->lock);
 152                                 s6000_pcm_enqueue_dma(substream);
 153                                 spin_unlock(&prtd->lock);
 154                         }
 155                 }
 156
 157                 if (unlikely(pending & ~7)) {
 158                         if (pending & (1 << 3))
 159                                 printk(KERN_WARNING
 160                                        "s6000-pcm: DMA %x Underflow\n",
 161                                        channel);
 162                         if (pending & (1 << 4))
 163                                 printk(KERN_WARNING
 164                                        "s6000-pcm: DMA %x Overflow\n",
 165                                        channel);
 166                         if (pending & 0x1e0)
 167                                 printk(KERN_WARNING
 168                                        "s6000-pcm: DMA %x Master Error "
 169                                        "(mask %x)\n",
 170                                        channel, pending >> 5);
 171
 172                 }
 173         }
 174
 175         return ret;
 176 }
 177
 178 static int s6000_pcm_start(struct snd_pcm_substream *substream)
 179 {
 180         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 181         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 182         struct s6000_pcm_dma_params *par;
 183         unsigned long flags;
 184         int srcinc;
 185         u32 dma;
 186
 187         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 188
 189         spin_lock_irqsave(&prtd->lock, flags);
 190
 191         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 192                 srcinc = 1;
 193                 dma = par->dma_out;
 194         } else {
 195                 srcinc = 0;
 196                 dma = par->dma_in;
 197         }
 198         s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma),
 199                            1 /* priority 1 (0 is max) */,
 200                            0 /* peripheral requests w/o xfer length mode */,
 201                            srcinc /* source address increment */,
 202                            srcinc^1 /* destination address increment */,
 203                            0 /* chunksize 0 (skip impossible on this dma) */,
 204                            0 /* source skip after chunk (impossible) */,
 205                            0 /* destination skip after chunk (impossible) */,
 206                            4 /* 16 byte burst size */,
 207                            -1 /* don't conserve bandwidth */,
 208                            0 /* low watermark irq descriptor threshold */,
 209                            0 /* disable hardware timestamps */,
 210                            1 /* enable channel */);
 211
 212         s6000_pcm_enqueue_dma(substream);
 213         s6000_pcm_enqueue_dma(substream);
 214
 215         spin_unlock_irqrestore(&prtd->lock, flags);
 216
 217         return 0;
 218 }
 219
 220 static int s6000_pcm_stop(struct snd_pcm_substream *substream)
 221 {
 222         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 223         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 224         struct s6000_pcm_dma_params *par;
 225         unsigned long flags;
 226         u32 channel;
 227
 228         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 229
 230         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 231                 channel = par->dma_out;
 232         else
 233                 channel = par->dma_in;
 234
 235         s6dmac_set_terminal_count(DMA_MASK_DMAC(channel),
 236                                   DMA_INDEX_CHNL(channel), 0);
 237
 238         spin_lock_irqsave(&prtd->lock, flags);
 239
 240         s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel));
 241
 242         spin_unlock_irqrestore(&prtd->lock, flags);
 243
 244         return 0;
 245 }
 246
 247 static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 248 {
 249         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 250         struct s6000_pcm_dma_params *par;
 251         int ret;
 252
 253         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 254
 255         ret = par->trigger(substream, cmd, 0);
 256         if (ret < 0)
 257                 return ret;
 258
 259         switch (cmd) {
 260         case SNDRV_PCM_TRIGGER_START:
 261         case SNDRV_PCM_TRIGGER_RESUME:
 262         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 263                 ret = s6000_pcm_start(substream);
 264                 break;
 265         case SNDRV_PCM_TRIGGER_STOP:
 266         case SNDRV_PCM_TRIGGER_SUSPEND:
 267         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 268                 ret = s6000_pcm_stop(substream);
 269                 break;
 270         default:
 271                 ret = -EINVAL;
 272         }
 273         if (ret < 0)
 274                 return ret;
 275
 276         return par->trigger(substream, cmd, 1);
 277 }
 278
 279 static int s6000_pcm_prepare(struct snd_pcm_substream *substream)
 280 {
 281         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 282
 283         prtd->period = 0;
 284
 285         return 0;
 286 }
 287
 288 static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream)
 289 {
 290         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 291         struct s6000_pcm_dma_params *par;
 292         struct snd_pcm_runtime *runtime = substream->runtime;
 293         struct s6000_runtime_data *prtd = runtime->private_data;
 294         unsigned long flags;
 295         unsigned int offset;
 296         dma_addr_t count;
 297
 298         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 299
 300         spin_lock_irqsave(&prtd->lock, flags);
 301
 302         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 303                 count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out),
 304                                        DMA_INDEX_CHNL(par->dma_out));
 305         else
 306                 count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in),
 307                                        DMA_INDEX_CHNL(par->dma_in));
 308
 309         count -= runtime->dma_addr;
 310
 311         spin_unlock_irqrestore(&prtd->lock, flags);
 312
 313         offset = bytes_to_frames(runtime, count);
 314         if (unlikely(offset >= runtime->buffer_size))
 315                 offset = 0;
 316
 317         return offset;
 318 }
 319
 320 static int s6000_pcm_open(struct snd_pcm_substream *substream)
 321 {
 322         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 323         struct s6000_pcm_dma_params *par;
 324         struct snd_pcm_runtime *runtime = substream->runtime;
 325         struct s6000_runtime_data *prtd;
 326         int ret;
 327
 328         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 329         snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware);
 330
 331         ret = snd_pcm_hw_constraint_step(runtime, 0,
 332                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16);
 333         if (ret < 0)
 334                 return ret;
 335         ret = snd_pcm_hw_constraint_step(runtime, 0,
 336                                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16);
 337         if (ret < 0)
 338                 return ret;
 339         ret = snd_pcm_hw_constraint_integer(runtime,
 340                                             SNDRV_PCM_HW_PARAM_PERIODS);
 341         if (ret < 0)
 342                 return ret;
 343
 344         if (par->same_rate) {
 345                 int rate;
 346                 spin_lock(&par->lock); /* needed? */
 347                 rate = par->rate;
 348                 spin_unlock(&par->lock);
 349                 if (rate != -1) {
 350                         ret = snd_pcm_hw_constraint_minmax(runtime,
 351                                                         SNDRV_PCM_HW_PARAM_RATE,
 352                                                         rate, rate);
 353                         if (ret < 0)
 354                                 return ret;
 355                 }
 356         }
 357
 358         prtd = kzalloc(sizeof(struct s6000_runtime_data), GFP_KERNEL);
 359         if (prtd == NULL)
 360                 return -ENOMEM;
 361
 362         spin_lock_init(&prtd->lock);
 363
 364         runtime->private_data = prtd;
 365
 366         return 0;
 367 }
 368
 369 static int s6000_pcm_close(struct snd_pcm_substream *substream)
 370 {
 371         struct snd_pcm_runtime *runtime = substream->runtime;
 372         struct s6000_runtime_data *prtd = runtime->private_data;
 373
 374         kfree(prtd);
 375
 376         return 0;
 377 }
 378
 379 static int s6000_pcm_hw_params(struct snd_pcm_substream *substream,
 380                                  struct snd_pcm_hw_params *hw_params)
 381 {
 382         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 383         struct s6000_pcm_dma_params *par;
 384         int ret;
 385         ret = snd_pcm_lib_malloc_pages(substream,
 386                                        params_buffer_bytes(hw_params));
 387         if (ret < 0) {
 388                 printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n");
 389                 return ret;
 390         }
 391
 392         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 393
 394         if (par->same_rate) {
 395                 spin_lock(&par->lock);
 396                 if (par->rate == -1 ||
 397                     !(par->in_use & ~(1 << substream->stream))) {
 398                         par->rate = params_rate(hw_params);
 399                         par->in_use |= 1 << substream->stream;
 400                 } else if (params_rate(hw_params) != par->rate) {
 401                         snd_pcm_lib_free_pages(substream);
 402                         par->in_use &= ~(1 << substream->stream);
 403                         ret = -EBUSY;
 404                 }
 405                 spin_unlock(&par->lock);
 406         }
 407         return ret;
 408 }
 409
 410 static int s6000_pcm_hw_free(struct snd_pcm_substream *substream)
 411 {
 412         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 413         struct s6000_pcm_dma_params *par =
 414                 snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 415
 416         spin_lock(&par->lock);
 417         par->in_use &= ~(1 << substream->stream);
 418         if (!par->in_use)
 419                 par->rate = -1;
 420         spin_unlock(&par->lock);
 421
 422         return snd_pcm_lib_free_pages(substream);
 423 }
 424
 425 static struct snd_pcm_ops s6000_pcm_ops = {
 426         .open =         s6000_pcm_open,
 427         .close =        s6000_pcm_close,
 428         .ioctl =        snd_pcm_lib_ioctl,
 429         .hw_params =    s6000_pcm_hw_params,
 430         .hw_free =      s6000_pcm_hw_free,
 431         .trigger =      s6000_pcm_trigger,
 432         .prepare =      s6000_pcm_prepare,
 433         .pointer =      s6000_pcm_pointer,
 434 };
 435
 436 static void s6000_pcm_free(struct snd_pcm *pcm)
 437 {
 438         struct snd_soc_pcm_runtime *runtime = pcm->private_data;
 439         struct s6000_pcm_dma_params *params =
 440                 snd_soc_dai_get_dma_data(runtime->cpu_dai,
 441                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream);
 442
 443         free_irq(params->irq, pcm);
 444         snd_pcm_lib_preallocate_free_for_all(pcm);
 445 }
 446
 447 static u64 s6000_pcm_dmamask = DMA_BIT_MASK(32);
 448
 449 static int s6000_pcm_new(struct snd_soc_pcm_runtime *runtime)
 450 {
 451         struct snd_card *card = runtime->card->snd_card;
 452         struct snd_pcm *pcm = runtime->pcm;
 453         struct s6000_pcm_dma_params *params;
 454         int res;
 455
 456         params = snd_soc_dai_get_dma_data(runtime->cpu_dai,
 457                         pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream);
 458
 459         if (!card->dev->dma_mask)
 460                 card->dev->dma_mask = &s6000_pcm_dmamask;
 461         if (!card->dev->coherent_dma_mask)
 462                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 463
 464         if (params->dma_in) {
 465                 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in),
 466                                     DMA_INDEX_CHNL(params->dma_in));
 467                 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in),
 468                                    DMA_INDEX_CHNL(params->dma_in));
 469         }
 470
 471         if (params->dma_out) {
 472                 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out),
 473                                     DMA_INDEX_CHNL(params->dma_out));
 474                 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out),
 475                                    DMA_INDEX_CHNL(params->dma_out));
 476         }
 477
 478         res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED,
 479                           "s6000-audio", pcm);
 480         if (res) {
 481                 printk(KERN_ERR "s6000-pcm couldn't get IRQ\n");
 482                 return res;
 483         }
 484
 485         res = snd_pcm_lib_preallocate_pages_for_all(pcm,
 486                                                     SNDRV_DMA_TYPE_DEV,
 487                                                     card->dev,
 488                                                     S6_PCM_PREALLOCATE_SIZE,
 489                                                     S6_PCM_PREALLOCATE_MAX);
 490         if (res)
 491                 printk(KERN_WARNING "s6000-pcm: preallocation failed\n");
 492
 493         spin_lock_init(&params->lock);
 494         params->in_use = 0;
 495         params->rate = -1;
 496         return 0;
 497 }
 498
 499 static struct snd_soc_platform_driver s6000_soc_platform = {
 500         .ops =          &s6000_pcm_ops,
 501         .pcm_new =      s6000_pcm_new,
 502         .pcm_free =     s6000_pcm_free,
 503 };
 504
 505 static int s6000_soc_platform_probe(struct platform_device *pdev)
 506 {
 507         return snd_soc_register_platform(&pdev->dev, &s6000_soc_platform);
 508 }
 509
 510 static int s6000_soc_platform_remove(struct platform_device *pdev)
 511 {
 512         snd_soc_unregister_platform(&pdev->dev);
 513         return 0;
 514 }
 515
 516 static struct platform_driver s6000_pcm_driver = {
 517         .driver = {
 518                         .name = "s6000-pcm-audio",
 519                         .owner = THIS_MODULE,
 520         },
 521
 522         .probe = s6000_soc_platform_probe,
 523         .remove = s6000_soc_platform_remove,
 524 };
 525
 526 module_platform_driver(s6000_pcm_driver);
 527
 528 MODULE_AUTHOR("Daniel Gloeckner");
 529 MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module");
 530 MODULE_LICENSE("GPL");