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 = soc_runtime->dai->cpu_dai->dma_data;
  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         period_size = snd_pcm_lib_period_bytes(substream);
  69         dma_offset = prtd->period * period_size;
  70         dma_pos = runtime->dma_addr + dma_offset;
  71
  72         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  73                 src = dma_pos;
  74                 dst = par->sif_out;
  75                 channel = par->dma_out;
  76         } else {
  77                 src = par->sif_in;
  78                 dst = dma_pos;
  79                 channel = par->dma_in;
  80         }
  81
  82         if (!s6dmac_channel_enabled(DMA_MASK_DMAC(channel),
  83                                     DMA_INDEX_CHNL(channel)))
  84                 return;
  85
  86         if (s6dmac_fifo_full(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel))) {
  87                 printk(KERN_ERR "s6000-pcm: fifo full\n");
  88                 return;
  89         }
  90
  91         BUG_ON(period_size & 15);
  92         s6dmac_put_fifo(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel),
  93                         src, dst, period_size);
  94
  95         prtd->period++;
  96         if (unlikely(prtd->period >= runtime->periods))
  97                 prtd->period = 0;
  98 }
  99
 100 static irqreturn_t s6000_pcm_irq(int irq, void *data)
 101 {
 102         struct snd_pcm *pcm = data;
 103         struct snd_soc_pcm_runtime *runtime = pcm->private_data;
 104         struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
 105         struct s6000_runtime_data *prtd;
 106         unsigned int has_xrun;
 107         int i, ret = IRQ_NONE;
 108         u32 channel[2] = {
 109                 [SNDRV_PCM_STREAM_PLAYBACK] = params->dma_out,
 110                 [SNDRV_PCM_STREAM_CAPTURE] = params->dma_in
 111         };
 112
 113         has_xrun = params->check_xrun(runtime->dai->cpu_dai);
 114
 115         for (i = 0; i < ARRAY_SIZE(channel); ++i) {
 116                 struct snd_pcm_substream *substream = pcm->streams[i].substream;
 117                 unsigned int pending;
 118
 119                 if (!channel[i])
 120                         continue;
 121
 122                 if (unlikely(has_xrun & (1 << i)) &&
 123                     substream->runtime &&
 124                     snd_pcm_running(substream)) {
 125                         dev_dbg(pcm->dev, "xrun\n");
 126                         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 127                         ret = IRQ_HANDLED;
 128                 }
 129
 130                 pending = s6dmac_int_sources(DMA_MASK_DMAC(channel[i]),
 131                                              DMA_INDEX_CHNL(channel[i]));
 132
 133                 if (pending & 1) {
 134                         ret = IRQ_HANDLED;
 135                         if (likely(substream->runtime &&
 136                                    snd_pcm_running(substream))) {
 137                                 snd_pcm_period_elapsed(substream);
 138                                 dev_dbg(pcm->dev, "period elapsed %x %x\n",
 139                                        s6dmac_cur_src(DMA_MASK_DMAC(channel[i]),
 140                                                    DMA_INDEX_CHNL(channel[i])),
 141                                        s6dmac_cur_dst(DMA_MASK_DMAC(channel[i]),
 142                                                    DMA_INDEX_CHNL(channel[i])));
 143                                 prtd = substream->runtime->private_data;
 144                                 spin_lock(&prtd->lock);
 145                                 s6000_pcm_enqueue_dma(substream);
 146                                 spin_unlock(&prtd->lock);
 147                         }
 148                 }
 149
 150                 if (unlikely(pending & ~7)) {
 151                         if (pending & (1 << 3))
 152                                 printk(KERN_WARNING
 153                                        "s6000-pcm: DMA %x Underflow\n",
 154                                        channel[i]);
 155                         if (pending & (1 << 4))
 156                                 printk(KERN_WARNING
 157                                        "s6000-pcm: DMA %x Overflow\n",
 158                                        channel[i]);
 159                         if (pending & 0x1e0)
 160                                 printk(KERN_WARNING
 161                                        "s6000-pcm: DMA %x Master Error "
 162                                        "(mask %x)\n",
 163                                        channel[i], pending >> 5);
 164
 165                 }
 166         }
 167
 168         return ret;
 169 }
 170
 171 static int s6000_pcm_start(struct snd_pcm_substream *substream)
 172 {
 173         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 174         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 175         struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
 176         unsigned long flags;
 177         int srcinc;
 178         u32 dma;
 179
 180         spin_lock_irqsave(&prtd->lock, flags);
 181
 182         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 183                 srcinc = 1;
 184                 dma = par->dma_out;
 185         } else {
 186                 srcinc = 0;
 187                 dma = par->dma_in;
 188         }
 189         s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma),
 190                            1 /* priority 1 (0 is max) */,
 191                            0 /* peripheral requests w/o xfer length mode */,
 192                            srcinc /* source address increment */,
 193                            srcinc^1 /* destination address increment */,
 194                            0 /* chunksize 0 (skip impossible on this dma) */,
 195                            0 /* source skip after chunk (impossible) */,
 196                            0 /* destination skip after chunk (impossible) */,
 197                            4 /* 16 byte burst size */,
 198                            -1 /* don't conserve bandwidth */,
 199                            0 /* low watermark irq descriptor theshold */,
 200                            0 /* disable hardware timestamps */,
 201                            1 /* enable channel */);
 202
 203         s6000_pcm_enqueue_dma(substream);
 204         s6000_pcm_enqueue_dma(substream);
 205
 206         spin_unlock_irqrestore(&prtd->lock, flags);
 207
 208         return 0;
 209 }
 210
 211 static int s6000_pcm_stop(struct snd_pcm_substream *substream)
 212 {
 213         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 214         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 215         struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
 216         unsigned long flags;
 217         u32 channel;
 218
 219         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 220                 channel = par->dma_out;
 221         else
 222                 channel = par->dma_in;
 223
 224         s6dmac_set_terminal_count(DMA_MASK_DMAC(channel),
 225                                   DMA_INDEX_CHNL(channel), 0);
 226
 227         spin_lock_irqsave(&prtd->lock, flags);
 228
 229         s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel));
 230
 231         spin_unlock_irqrestore(&prtd->lock, flags);
 232
 233         return 0;
 234 }
 235
 236 static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 237 {
 238         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 239         struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
 240         int ret;
 241
 242         ret = par->trigger(substream, cmd, 0);
 243         if (ret < 0)
 244                 return ret;
 245
 246         switch (cmd) {
 247         case SNDRV_PCM_TRIGGER_START:
 248         case SNDRV_PCM_TRIGGER_RESUME:
 249         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 250                 ret = s6000_pcm_start(substream);
 251                 break;
 252         case SNDRV_PCM_TRIGGER_STOP:
 253         case SNDRV_PCM_TRIGGER_SUSPEND:
 254         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 255                 ret = s6000_pcm_stop(substream);
 256                 break;
 257         default:
 258                 ret = -EINVAL;
 259         }
 260         if (ret < 0)
 261                 return ret;
 262
 263         return par->trigger(substream, cmd, 1);
 264 }
 265
 266 static int s6000_pcm_prepare(struct snd_pcm_substream *substream)
 267 {
 268         struct s6000_runtime_data *prtd = substream->runtime->private_data;
 269
 270         prtd->period = 0;
 271
 272         return 0;
 273 }
 274
 275 static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream)
 276 {
 277         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 278         struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
 279         struct snd_pcm_runtime *runtime = substream->runtime;
 280         struct s6000_runtime_data *prtd = runtime->private_data;
 281         unsigned long flags;
 282         unsigned int offset;
 283         dma_addr_t count;
 284
 285         spin_lock_irqsave(&prtd->lock, flags);
 286
 287         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 288                 count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out),
 289                                        DMA_INDEX_CHNL(par->dma_out));
 290         else
 291                 count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in),
 292                                        DMA_INDEX_CHNL(par->dma_in));
 293
 294         count -= runtime->dma_addr;
 295
 296         spin_unlock_irqrestore(&prtd->lock, flags);
 297
 298         offset = bytes_to_frames(runtime, count);
 299         if (unlikely(offset >= runtime->buffer_size))
 300                 offset = 0;
 301
 302         return offset;
 303 }
 304
 305 static int s6000_pcm_open(struct snd_pcm_substream *substream)
 306 {
 307         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 308         struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
 309         struct snd_pcm_runtime *runtime = substream->runtime;
 310         struct s6000_runtime_data *prtd;
 311         int ret;
 312
 313         snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware);
 314
 315         ret = snd_pcm_hw_constraint_step(runtime, 0,
 316                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16);
 317         if (ret < 0)
 318                 return ret;
 319         ret = snd_pcm_hw_constraint_step(runtime, 0,
 320                                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16);
 321         if (ret < 0)
 322                 return ret;
 323         ret = snd_pcm_hw_constraint_integer(runtime,
 324                                             SNDRV_PCM_HW_PARAM_PERIODS);
 325         if (ret < 0)
 326                 return ret;
 327
 328         if (par->same_rate) {
 329                 int rate;
 330                 spin_lock(&par->lock); /* needed? */
 331                 rate = par->rate;
 332                 spin_unlock(&par->lock);
 333                 if (rate != -1) {
 334                         ret = snd_pcm_hw_constraint_minmax(runtime,
 335                                                         SNDRV_PCM_HW_PARAM_RATE,
 336                                                         rate, rate);
 337                         if (ret < 0)
 338                                 return ret;
 339                 }
 340         }
 341
 342         prtd = kzalloc(sizeof(struct s6000_runtime_data), GFP_KERNEL);
 343         if (prtd == NULL)
 344                 return -ENOMEM;
 345
 346         spin_lock_init(&prtd->lock);
 347
 348         runtime->private_data = prtd;
 349
 350         return 0;
 351 }
 352
 353 static int s6000_pcm_close(struct snd_pcm_substream *substream)
 354 {
 355         struct snd_pcm_runtime *runtime = substream->runtime;
 356         struct s6000_runtime_data *prtd = runtime->private_data;
 357
 358         kfree(prtd);
 359
 360         return 0;
 361 }
 362
 363 static int s6000_pcm_hw_params(struct snd_pcm_substream *substream,
 364                                  struct snd_pcm_hw_params *hw_params)
 365 {
 366         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 367         struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
 368         int ret;
 369         ret = snd_pcm_lib_malloc_pages(substream,
 370                                        params_buffer_bytes(hw_params));
 371         if (ret < 0) {
 372                 printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n");
 373                 return ret;
 374         }
 375
 376         if (par->same_rate) {
 377                 spin_lock(&par->lock);
 378                 if (par->rate == -1 ||
 379                     !(par->in_use & ~(1 << substream->stream))) {
 380                         par->rate = params_rate(hw_params);
 381                         par->in_use |= 1 << substream->stream;
 382                 } else if (params_rate(hw_params) != par->rate) {
 383                         snd_pcm_lib_free_pages(substream);
 384                         par->in_use &= ~(1 << substream->stream);
 385                         ret = -EBUSY;
 386                 }
 387                 spin_unlock(&par->lock);
 388         }
 389         return ret;
 390 }
 391
 392 static int s6000_pcm_hw_free(struct snd_pcm_substream *substream)
 393 {
 394         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 395         struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
 396
 397         spin_lock(&par->lock);
 398         par->in_use &= ~(1 << substream->stream);
 399         if (!par->in_use)
 400                 par->rate = -1;
 401         spin_unlock(&par->lock);
 402
 403         return snd_pcm_lib_free_pages(substream);
 404 }
 405
 406 static struct snd_pcm_ops s6000_pcm_ops = {
 407         .open =         s6000_pcm_open,
 408         .close =        s6000_pcm_close,
 409         .ioctl =        snd_pcm_lib_ioctl,
 410         .hw_params =    s6000_pcm_hw_params,
 411         .hw_free =      s6000_pcm_hw_free,
 412         .trigger =      s6000_pcm_trigger,
 413         .prepare =      s6000_pcm_prepare,
 414         .pointer =      s6000_pcm_pointer,
 415 };
 416
 417 static void s6000_pcm_free(struct snd_pcm *pcm)
 418 {
 419         struct snd_soc_pcm_runtime *runtime = pcm->private_data;
 420         struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
 421
 422         free_irq(params->irq, pcm);
 423         snd_pcm_lib_preallocate_free_for_all(pcm);
 424 }
 425
 426 static u64 s6000_pcm_dmamask = DMA_32BIT_MASK;
 427
 428 static int s6000_pcm_new(struct snd_card *card,
 429                          struct snd_soc_dai *dai, struct snd_pcm *pcm)
 430 {
 431         struct snd_soc_pcm_runtime *runtime = pcm->private_data;
 432         struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
 433         int res;
 434
 435         if (!card->dev->dma_mask)
 436                 card->dev->dma_mask = &s6000_pcm_dmamask;
 437         if (!card->dev->coherent_dma_mask)
 438                 card->dev->coherent_dma_mask = DMA_32BIT_MASK;
 439
 440         if (params->dma_in) {
 441                 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in),
 442                                     DMA_INDEX_CHNL(params->dma_in));
 443                 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in),
 444                                    DMA_INDEX_CHNL(params->dma_in));
 445         }
 446
 447         if (params->dma_out) {
 448                 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out),
 449                                     DMA_INDEX_CHNL(params->dma_out));
 450                 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out),
 451                                    DMA_INDEX_CHNL(params->dma_out));
 452         }
 453
 454         res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED,
 455                           s6000_soc_platform.name, pcm);
 456         if (res) {
 457                 printk(KERN_ERR "s6000-pcm couldn't get IRQ\n");
 458                 return res;
 459         }
 460
 461         res = snd_pcm_lib_preallocate_pages_for_all(pcm,
 462                                                     SNDRV_DMA_TYPE_DEV,
 463                                                     card->dev,
 464                                                     S6_PCM_PREALLOCATE_SIZE,
 465                                                     S6_PCM_PREALLOCATE_MAX);
 466         if (res)
 467                 printk(KERN_WARNING "s6000-pcm: preallocation failed\n");
 468
 469         spin_lock_init(&params->lock);
 470         params->in_use = 0;
 471         params->rate = -1;
 472         return 0;
 473 }
 474
 475 struct snd_soc_platform s6000_soc_platform = {
 476         .name =         "s6000-audio",
 477         .pcm_ops =      &s6000_pcm_ops,
 478         .pcm_new =      s6000_pcm_new,
 479         .pcm_free =     s6000_pcm_free,
 480 };
 481 EXPORT_SYMBOL_GPL(s6000_soc_platform);
 482
 483 static int __init s6000_pcm_init(void)
 484 {
 485         return snd_soc_register_platform(&s6000_soc_platform);
 486 }
 487 module_init(s6000_pcm_init);
 488
 489 static void __exit s6000_pcm_exit(void)
 490 {
 491         snd_soc_unregister_platform(&s6000_soc_platform);
 492 }
 493 module_exit(s6000_pcm_exit);
 494
 495 MODULE_AUTHOR("Daniel Gloeckner");
 496 MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module");
 497 MODULE_LICENSE("GPL");