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_stop(substream, SNDRV_PCM_STATE_XRUN);
 132                         ret = IRQ_HANDLED;
 133                 }
 134
 135                 pending = s6dmac_int_sources(DMA_MASK_DMAC(channel),
 136                                              DMA_INDEX_CHNL(channel));
 137
 138                 if (pending & 1) {
 139                         ret = IRQ_HANDLED;
 140                         if (likely(substream->runtime &&
 141                                    snd_pcm_running(substream))) {
 142                                 snd_pcm_period_elapsed(substream);
 143                                 dev_dbg(pcm->dev, "period elapsed %x %x\n",
 144                                        s6dmac_cur_src(DMA_MASK_DMAC(channel),
 145                                                    DMA_INDEX_CHNL(channel)),
 146                                        s6dmac_cur_dst(DMA_MASK_DMAC(channel),
 147                                                    DMA_INDEX_CHNL(channel)));
 148                                 prtd = substream->runtime->private_data;
 149                                 spin_lock(&prtd->lock);
 150                                 s6000_pcm_enqueue_dma(substream);
 151                                 spin_unlock(&prtd->lock);
 152                         }
 153                 }
 154
 155                 if (unlikely(pending & ~7)) {
 156                         if (pending & (1 << 3))
 157                                 printk(KERN_WARNING
 158                                        "s6000-pcm: DMA %x Underflow\n",
 159                                        channel);
 160                         if (pending & (1 << 4))
 161                                 printk(KERN_WARNING
 162                                        "s6000-pcm: DMA %x Overflow\n",
 163                                        channel);
 164                         if (pending & 0x1e0)
 165                                 printk(KERN_WARNING
 166                                        "s6000-pcm: DMA %x Master Error "
 167                                        "(mask %x)\n",
 168                                        channel, pending >> 5);
 169
 170                 }
 171         }
 172
 173         return ret;
 174 }
 175
 176 static int s6000_pcm_start(struct snd_pcm_substream *substream)
 177 {
 178         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 179         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 180         struct s6000_pcm_dma_params *par;
 181         unsigned long flags;
 182         int srcinc;
 183         u32 dma;
 184
 185         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 186
 187         spin_lock_irqsave(&prtd->lock, flags);
 188
 189         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 190                 srcinc = 1;
 191                 dma = par->dma_out;
 192         } else {
 193                 srcinc = 0;
 194                 dma = par->dma_in;
 195         }
 196         s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma),
 197                            1 /* priority 1 (0 is max) */,
 198                            0 /* peripheral requests w/o xfer length mode */,
 199                            srcinc /* source address increment */,
 200                            srcinc^1 /* destination address increment */,
 201                            0 /* chunksize 0 (skip impossible on this dma) */,
 202                            0 /* source skip after chunk (impossible) */,
 203                            0 /* destination skip after chunk (impossible) */,
 204                            4 /* 16 byte burst size */,
 205                            -1 /* don't conserve bandwidth */,
 206                            0 /* low watermark irq descriptor threshold */,
 207                            0 /* disable hardware timestamps */,
 208                            1 /* enable channel */);
 209
 210         s6000_pcm_enqueue_dma(substream);
 211         s6000_pcm_enqueue_dma(substream);
 212
 213         spin_unlock_irqrestore(&prtd->lock, flags);
 214
 215         return 0;
 216 }
 217
 218 static int s6000_pcm_stop(struct snd_pcm_substream *substream)
 219 {
 220         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 221         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 222         struct s6000_pcm_dma_params *par;
 223         unsigned long flags;
 224         u32 channel;
 225
 226         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 227
 228         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 229                 channel = par->dma_out;
 230         else
 231                 channel = par->dma_in;
 232
 233         s6dmac_set_terminal_count(DMA_MASK_DMAC(channel),
 234                                   DMA_INDEX_CHNL(channel), 0);
 235
 236         spin_lock_irqsave(&prtd->lock, flags);
 237
 238         s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel));
 239
 240         spin_unlock_irqrestore(&prtd->lock, flags);
 241
 242         return 0;
 243 }
 244
 245 static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 246 {
 247         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 248         struct s6000_pcm_dma_params *par;
 249         int ret;
 250
 251         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 252
 253         ret = par->trigger(substream, cmd, 0);
 254         if (ret < 0)
 255                 return ret;
 256
 257         switch (cmd) {
 258         case SNDRV_PCM_TRIGGER_START:
 259         case SNDRV_PCM_TRIGGER_RESUME:
 260         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 261                 ret = s6000_pcm_start(substream);
 262                 break;
 263         case SNDRV_PCM_TRIGGER_STOP:
 264         case SNDRV_PCM_TRIGGER_SUSPEND:
 265         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 266                 ret = s6000_pcm_stop(substream);
 267                 break;
 268         default:
 269                 ret = -EINVAL;
 270         }
 271         if (ret < 0)
 272                 return ret;
 273
 274         return par->trigger(substream, cmd, 1);
 275 }
 276
 277 static int s6000_pcm_prepare(struct snd_pcm_substream *substream)
 278 {
 279         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 280
 281         prtd->period = 0;
 282
 283         return 0;
 284 }
 285
 286 static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream)
 287 {
 288         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 289         struct s6000_pcm_dma_params *par;
 290         struct snd_pcm_runtime *runtime = substream->runtime;
 291         struct s6000_runtime_data *prtd = runtime->private_data;
 292         unsigned long flags;
 293         unsigned int offset;
 294         dma_addr_t count;
 295
 296         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 297
 298         spin_lock_irqsave(&prtd->lock, flags);
 299
 300         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 301                 count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out),
 302                                        DMA_INDEX_CHNL(par->dma_out));
 303         else
 304                 count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in),
 305                                        DMA_INDEX_CHNL(par->dma_in));
 306
 307         count -= runtime->dma_addr;
 308
 309         spin_unlock_irqrestore(&prtd->lock, flags);
 310
 311         offset = bytes_to_frames(runtime, count);
 312         if (unlikely(offset >= runtime->buffer_size))
 313                 offset = 0;
 314
 315         return offset;
 316 }
 317
 318 static int s6000_pcm_open(struct snd_pcm_substream *substream)
 319 {
 320         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 321         struct s6000_pcm_dma_params *par;
 322         struct snd_pcm_runtime *runtime = substream->runtime;
 323         struct s6000_runtime_data *prtd;
 324         int ret;
 325
 326         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 327         snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware);
 328
 329         ret = snd_pcm_hw_constraint_step(runtime, 0,
 330                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16);
 331         if (ret < 0)
 332                 return ret;
 333         ret = snd_pcm_hw_constraint_step(runtime, 0,
 334                                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16);
 335         if (ret < 0)
 336                 return ret;
 337         ret = snd_pcm_hw_constraint_integer(runtime,
 338                                             SNDRV_PCM_HW_PARAM_PERIODS);
 339         if (ret < 0)
 340                 return ret;
 341
 342         if (par->same_rate) {
 343                 int rate;
 344                 spin_lock(&par->lock); /* needed? */
 345                 rate = par->rate;
 346                 spin_unlock(&par->lock);
 347                 if (rate != -1) {
 348                         ret = snd_pcm_hw_constraint_minmax(runtime,
 349                                                         SNDRV_PCM_HW_PARAM_RATE,
 350                                                         rate, rate);
 351                         if (ret < 0)
 352                                 return ret;
 353                 }
 354         }
 355
 356         prtd = kzalloc(sizeof(struct s6000_runtime_data), GFP_KERNEL);
 357         if (prtd == NULL)
 358                 return -ENOMEM;
 359
 360         spin_lock_init(&prtd->lock);
 361
 362         runtime->private_data = prtd;
 363
 364         return 0;
 365 }
 366
 367 static int s6000_pcm_close(struct snd_pcm_substream *substream)
 368 {
 369         struct snd_pcm_runtime *runtime = substream->runtime;
 370         struct s6000_runtime_data *prtd = runtime->private_data;
 371
 372         kfree(prtd);
 373
 374         return 0;
 375 }
 376
 377 static int s6000_pcm_hw_params(struct snd_pcm_substream *substream,
 378                                  struct snd_pcm_hw_params *hw_params)
 379 {
 380         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 381         struct s6000_pcm_dma_params *par;
 382         int ret;
 383         ret = snd_pcm_lib_malloc_pages(substream,
 384                                        params_buffer_bytes(hw_params));
 385         if (ret < 0) {
 386                 printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n");
 387                 return ret;
 388         }
 389
 390         par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 391
 392         if (par->same_rate) {
 393                 spin_lock(&par->lock);
 394                 if (par->rate == -1 ||
 395                     !(par->in_use & ~(1 << substream->stream))) {
 396                         par->rate = params_rate(hw_params);
 397                         par->in_use |= 1 << substream->stream;
 398                 } else if (params_rate(hw_params) != par->rate) {
 399                         snd_pcm_lib_free_pages(substream);
 400                         par->in_use &= ~(1 << substream->stream);
 401                         ret = -EBUSY;
 402                 }
 403                 spin_unlock(&par->lock);
 404         }
 405         return ret;
 406 }
 407
 408 static int s6000_pcm_hw_free(struct snd_pcm_substream *substream)
 409 {
 410         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 411         struct s6000_pcm_dma_params *par =
 412                 snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
 413
 414         spin_lock(&par->lock);
 415         par->in_use &= ~(1 << substream->stream);
 416         if (!par->in_use)
 417                 par->rate = -1;
 418         spin_unlock(&par->lock);
 419
 420         return snd_pcm_lib_free_pages(substream);
 421 }
 422
 423 static struct snd_pcm_ops s6000_pcm_ops = {
 424         .open =         s6000_pcm_open,
 425         .close =        s6000_pcm_close,
 426         .ioctl =        snd_pcm_lib_ioctl,
 427         .hw_params =    s6000_pcm_hw_params,
 428         .hw_free =      s6000_pcm_hw_free,
 429         .trigger =      s6000_pcm_trigger,
 430         .prepare =      s6000_pcm_prepare,
 431         .pointer =      s6000_pcm_pointer,
 432 };
 433
 434 static void s6000_pcm_free(struct snd_pcm *pcm)
 435 {
 436         struct snd_soc_pcm_runtime *runtime = pcm->private_data;
 437         struct s6000_pcm_dma_params *params =
 438                 snd_soc_dai_get_dma_data(runtime->cpu_dai, pcm->streams[0].substream);
 439
 440         free_irq(params->irq, pcm);
 441         snd_pcm_lib_preallocate_free_for_all(pcm);
 442 }
 443
 444 static u64 s6000_pcm_dmamask = DMA_BIT_MASK(32);
 445
 446 static int s6000_pcm_new(struct snd_soc_pcm_runtime *runtime)
 447 {
 448         struct snd_card *card = runtime->card->snd_card;
 449         struct snd_pcm *pcm = runtime->pcm;
 450         struct s6000_pcm_dma_params *params;
 451         int res;
 452
 453         params = snd_soc_dai_get_dma_data(runtime->cpu_dai,
 454                         pcm->streams[0].substream);
 455
 456         if (!card->dev->dma_mask)
 457                 card->dev->dma_mask = &s6000_pcm_dmamask;
 458         if (!card->dev->coherent_dma_mask)
 459                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 460
 461         if (params->dma_in) {
 462                 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in),
 463                                     DMA_INDEX_CHNL(params->dma_in));
 464                 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in),
 465                                    DMA_INDEX_CHNL(params->dma_in));
 466         }
 467
 468         if (params->dma_out) {
 469                 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out),
 470                                     DMA_INDEX_CHNL(params->dma_out));
 471                 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out),
 472                                    DMA_INDEX_CHNL(params->dma_out));
 473         }
 474
 475         res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED,
 476                           "s6000-audio", pcm);
 477         if (res) {
 478                 printk(KERN_ERR "s6000-pcm couldn't get IRQ\n");
 479                 return res;
 480         }
 481
 482         res = snd_pcm_lib_preallocate_pages_for_all(pcm,
 483                                                     SNDRV_DMA_TYPE_DEV,
 484                                                     card->dev,
 485                                                     S6_PCM_PREALLOCATE_SIZE,
 486                                                     S6_PCM_PREALLOCATE_MAX);
 487         if (res)
 488                 printk(KERN_WARNING "s6000-pcm: preallocation failed\n");
 489
 490         spin_lock_init(&params->lock);
 491         params->in_use = 0;
 492         params->rate = -1;
 493         return 0;
 494 }
 495
 496 static struct snd_soc_platform_driver s6000_soc_platform = {
 497         .ops =          &s6000_pcm_ops,
 498         .pcm_new =      s6000_pcm_new,
 499         .pcm_free =     s6000_pcm_free,
 500 };
 501
 502 static int __devinit s6000_soc_platform_probe(struct platform_device *pdev)
 503 {
 504         return snd_soc_register_platform(&pdev->dev, &s6000_soc_platform);
 505 }
 506
 507 static int __devexit s6000_soc_platform_remove(struct platform_device *pdev)
 508 {
 509         snd_soc_unregister_platform(&pdev->dev);
 510         return 0;
 511 }
 512
 513 static struct platform_driver s6000_pcm_driver = {
 514         .driver = {
 515                         .name = "s6000-pcm-audio",
 516                         .owner = THIS_MODULE,
 517         },
 518
 519         .probe = s6000_soc_platform_probe,
 520         .remove = __devexit_p(s6000_soc_platform_remove),
 521 };
 522
 523 static int __init snd_s6000_pcm_init(void)
 524 {
 525         return platform_driver_register(&s6000_pcm_driver);
 526 }
 527 module_init(snd_s6000_pcm_init);
 528
 529 static void __exit snd_s6000_pcm_exit(void)
 530 {
 531         platform_driver_unregister(&s6000_pcm_driver);
 532 }
 533 module_exit(snd_s6000_pcm_exit);
 534
 535 MODULE_AUTHOR("Daniel Gloeckner");
 536 MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module");
 537 MODULE_LICENSE("GPL");