git.oblomov.eu Git - linux-2.6/blob - sound/soc/atmel/atmel-pcm.c

   1 /*
   2  * atmel-pcm.c  --  ALSA PCM interface for the Atmel atmel SoC.
   3  *
   4  *  Copyright (C) 2005 SAN People
   5  *  Copyright (C) 2008 Atmel
   6  *
   7  * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
   8  *
   9  * Based on at91-pcm. by:
  10  * Frank Mandarino <fmandarino@endrelia.com>
  11  * Copyright 2006 Endrelia Technologies Inc.
  12  *
  13  * Based on pxa2xx-pcm.c by:
  14  *
  15  * Author:      Nicolas Pitre
  16  * Created:     Nov 30, 2004
  17  * Copyright:   (C) 2004 MontaVista Software, Inc.
  18  *
  19  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the GNU General Public License as published by
  21  * the Free Software Foundation; either version 2 of the License, or
  22  * (at your option) any later version.
  23  *
  24  * This program is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU General Public License
  30  * along with this program; if not, write to the Free Software
  31  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/init.h>
  36 #include <linux/platform_device.h>
  37 #include <linux/slab.h>
  38 #include <linux/dma-mapping.h>
  39 #include <linux/atmel_pdc.h>
  40 #include <linux/atmel-ssc.h>
  41
  42 #include <sound/core.h>
  43 #include <sound/pcm.h>
  44 #include <sound/pcm_params.h>
  45 #include <sound/soc.h>
  46
  47 #include <mach/hardware.h>
  48
  49 #include "atmel-pcm.h"
  50
  51
  52 /*--------------------------------------------------------------------------*\
  53  * Hardware definition
  54 \*--------------------------------------------------------------------------*/
  55 /* TODO: These values were taken from the AT91 platform driver, check
  56  *       them against real values for AT32
  57  */
  58 static const struct snd_pcm_hardware atmel_pcm_hardware = {
  59         .info                   = SNDRV_PCM_INFO_MMAP |
  60                                   SNDRV_PCM_INFO_MMAP_VALID |
  61                                   SNDRV_PCM_INFO_INTERLEAVED |
  62                                   SNDRV_PCM_INFO_PAUSE,
  63         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
  64         .period_bytes_min       = 32,
  65         .period_bytes_max       = 8192,
  66         .periods_min            = 2,
  67         .periods_max            = 1024,
  68         .buffer_bytes_max       = 32 * 1024,
  69 };
  70
  71
  72 /*--------------------------------------------------------------------------*\
  73  * Data types
  74 \*--------------------------------------------------------------------------*/
  75 struct atmel_runtime_data {
  76         struct atmel_pcm_dma_params *params;
  77         dma_addr_t dma_buffer;          /* physical address of dma buffer */
  78         dma_addr_t dma_buffer_end;      /* first address beyond DMA buffer */
  79         size_t period_size;
  80
  81         dma_addr_t period_ptr;          /* physical address of next period */
  82         int periods;                    /* period index of period_ptr */
  83
  84         /* PDC register save */
  85         u32 pdc_xpr_save;
  86         u32 pdc_xcr_save;
  87         u32 pdc_xnpr_save;
  88         u32 pdc_xncr_save;
  89 };
  90
  91
  92 /*--------------------------------------------------------------------------*\
  93  * Helper functions
  94 \*--------------------------------------------------------------------------*/
  95 static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
  96         int stream)
  97 {
  98         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
  99         struct snd_dma_buffer *buf = &substream->dma_buffer;
 100         size_t size = atmel_pcm_hardware.buffer_bytes_max;
 101
 102         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 103         buf->dev.dev = pcm->card->dev;
 104         buf->private_data = NULL;
 105         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 106                                           &buf->addr, GFP_KERNEL);
 107         pr_debug("atmel-pcm:"
 108                 "preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
 109                 (void *) buf->area,
 110                 (void *) buf->addr,
 111                 size);
 112
 113         if (!buf->area)
 114                 return -ENOMEM;
 115
 116         buf->bytes = size;
 117         return 0;
 118 }
 119 /*--------------------------------------------------------------------------*\
 120  * ISR
 121 \*--------------------------------------------------------------------------*/
 122 static void atmel_pcm_dma_irq(u32 ssc_sr,
 123         struct snd_pcm_substream *substream)
 124 {
 125         struct atmel_runtime_data *prtd = substream->runtime->private_data;
 126         struct atmel_pcm_dma_params *params = prtd->params;
 127         static int count;
 128
 129         count++;
 130
 131         if (ssc_sr & params->mask->ssc_endbuf) {
 132                 pr_warning("atmel-pcm: buffer %s on %s"
 133                                 " (SSC_SR=%#x, count=%d)\n",
 134                                 substream->stream == SNDRV_PCM_STREAM_PLAYBACK
 135                                 ? "underrun" : "overrun",
 136                                 params->name, ssc_sr, count);
 137
 138                 /* re-start the PDC */
 139                 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
 140                            params->mask->pdc_disable);
 141                 prtd->period_ptr += prtd->period_size;
 142                 if (prtd->period_ptr >= prtd->dma_buffer_end)
 143                         prtd->period_ptr = prtd->dma_buffer;
 144
 145                 ssc_writex(params->ssc->regs, params->pdc->xpr,
 146                            prtd->period_ptr);
 147                 ssc_writex(params->ssc->regs, params->pdc->xcr,
 148                            prtd->period_size / params->pdc_xfer_size);
 149                 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
 150                            params->mask->pdc_enable);
 151         }
 152
 153         if (ssc_sr & params->mask->ssc_endx) {
 154                 /* Load the PDC next pointer and counter registers */
 155                 prtd->period_ptr += prtd->period_size;
 156                 if (prtd->period_ptr >= prtd->dma_buffer_end)
 157                         prtd->period_ptr = prtd->dma_buffer;
 158
 159                 ssc_writex(params->ssc->regs, params->pdc->xnpr,
 160                            prtd->period_ptr);
 161                 ssc_writex(params->ssc->regs, params->pdc->xncr,
 162                            prtd->period_size / params->pdc_xfer_size);
 163         }
 164
 165         snd_pcm_period_elapsed(substream);
 166 }
 167
 168
 169 /*--------------------------------------------------------------------------*\
 170  * PCM operations
 171 \*--------------------------------------------------------------------------*/
 172 static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
 173         struct snd_pcm_hw_params *params)
 174 {
 175         struct snd_pcm_runtime *runtime = substream->runtime;
 176         struct atmel_runtime_data *prtd = runtime->private_data;
 177         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 178
 179         /* this may get called several times by oss emulation
 180          * with different params */
 181
 182         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 183         runtime->dma_bytes = params_buffer_bytes(params);
 184
 185         prtd->params = rtd->dai->cpu_dai->dma_data;
 186         prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
 187
 188         prtd->dma_buffer = runtime->dma_addr;
 189         prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
 190         prtd->period_size = params_period_bytes(params);
 191
 192         pr_debug("atmel-pcm: "
 193                 "hw_params: DMA for %s initialized "
 194                 "(dma_bytes=%u, period_size=%u)\n",
 195                 prtd->params->name,
 196                 runtime->dma_bytes,
 197                 prtd->period_size);
 198         return 0;
 199 }
 200
 201 static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
 202 {
 203         struct atmel_runtime_data *prtd = substream->runtime->private_data;
 204         struct atmel_pcm_dma_params *params = prtd->params;
 205
 206         if (params != NULL) {
 207                 ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
 208                            params->mask->pdc_disable);
 209                 prtd->params->dma_intr_handler = NULL;
 210         }
 211
 212         return 0;
 213 }
 214
 215 static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
 216 {
 217         struct atmel_runtime_data *prtd = substream->runtime->private_data;
 218         struct atmel_pcm_dma_params *params = prtd->params;
 219
 220         ssc_writex(params->ssc->regs, SSC_IDR,
 221                    params->mask->ssc_endx | params->mask->ssc_endbuf);
 222         ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
 223                    params->mask->pdc_disable);
 224         return 0;
 225 }
 226
 227 static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
 228         int cmd)
 229 {
 230         struct snd_pcm_runtime *rtd = substream->runtime;
 231         struct atmel_runtime_data *prtd = rtd->private_data;
 232         struct atmel_pcm_dma_params *params = prtd->params;
 233         int ret = 0;
 234
 235         pr_debug("atmel-pcm:buffer_size = %ld,"
 236                 "dma_area = %p, dma_bytes = %u\n",
 237                 rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
 238
 239         switch (cmd) {
 240         case SNDRV_PCM_TRIGGER_START:
 241                 prtd->period_ptr = prtd->dma_buffer;
 242
 243                 ssc_writex(params->ssc->regs, params->pdc->xpr,
 244                            prtd->period_ptr);
 245                 ssc_writex(params->ssc->regs, params->pdc->xcr,
 246                            prtd->period_size / params->pdc_xfer_size);
 247
 248                 prtd->period_ptr += prtd->period_size;
 249                 ssc_writex(params->ssc->regs, params->pdc->xnpr,
 250                            prtd->period_ptr);
 251                 ssc_writex(params->ssc->regs, params->pdc->xncr,
 252                            prtd->period_size / params->pdc_xfer_size);
 253
 254                 pr_debug("atmel-pcm: trigger: "
 255                         "period_ptr=%lx, xpr=%u, "
 256                         "xcr=%u, xnpr=%u, xncr=%u\n",
 257                         (unsigned long)prtd->period_ptr,
 258                         ssc_readx(params->ssc->regs, params->pdc->xpr),
 259                         ssc_readx(params->ssc->regs, params->pdc->xcr),
 260                         ssc_readx(params->ssc->regs, params->pdc->xnpr),
 261                         ssc_readx(params->ssc->regs, params->pdc->xncr));
 262
 263                 ssc_writex(params->ssc->regs, SSC_IER,
 264                            params->mask->ssc_endx | params->mask->ssc_endbuf);
 265                 ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
 266                            params->mask->pdc_enable);
 267
 268                 pr_debug("sr=%u imr=%u\n",
 269                         ssc_readx(params->ssc->regs, SSC_SR),
 270                         ssc_readx(params->ssc->regs, SSC_IER));
 271                 break;          /* SNDRV_PCM_TRIGGER_START */
 272
 273         case SNDRV_PCM_TRIGGER_STOP:
 274         case SNDRV_PCM_TRIGGER_SUSPEND:
 275         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 276                 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
 277                            params->mask->pdc_disable);
 278                 break;
 279
 280         case SNDRV_PCM_TRIGGER_RESUME:
 281         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 282                 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
 283                            params->mask->pdc_enable);
 284                 break;
 285
 286         default:
 287                 ret = -EINVAL;
 288         }
 289
 290         return ret;
 291 }
 292
 293 static snd_pcm_uframes_t atmel_pcm_pointer(
 294         struct snd_pcm_substream *substream)
 295 {
 296         struct snd_pcm_runtime *runtime = substream->runtime;
 297         struct atmel_runtime_data *prtd = runtime->private_data;
 298         struct atmel_pcm_dma_params *params = prtd->params;
 299         dma_addr_t ptr;
 300         snd_pcm_uframes_t x;
 301
 302         ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
 303         x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
 304
 305         if (x == runtime->buffer_size)
 306                 x = 0;
 307
 308         return x;
 309 }
 310
 311 static int atmel_pcm_open(struct snd_pcm_substream *substream)
 312 {
 313         struct snd_pcm_runtime *runtime = substream->runtime;
 314         struct atmel_runtime_data *prtd;
 315         int ret = 0;
 316
 317         snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);
 318
 319         /* ensure that buffer size is a multiple of period size */
 320         ret = snd_pcm_hw_constraint_integer(runtime,
 321                                                 SNDRV_PCM_HW_PARAM_PERIODS);
 322         if (ret < 0)
 323                 goto out;
 324
 325         prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
 326         if (prtd == NULL) {
 327                 ret = -ENOMEM;
 328                 goto out;
 329         }
 330         runtime->private_data = prtd;
 331
 332  out:
 333         return ret;
 334 }
 335
 336 static int atmel_pcm_close(struct snd_pcm_substream *substream)
 337 {
 338         struct atmel_runtime_data *prtd = substream->runtime->private_data;
 339
 340         kfree(prtd);
 341         return 0;
 342 }
 343
 344 static int atmel_pcm_mmap(struct snd_pcm_substream *substream,
 345         struct vm_area_struct *vma)
 346 {
 347         return remap_pfn_range(vma, vma->vm_start,
 348                        substream->dma_buffer.addr >> PAGE_SHIFT,
 349                        vma->vm_end - vma->vm_start, vma->vm_page_prot);
 350 }
 351
 352 struct snd_pcm_ops atmel_pcm_ops = {
 353         .open           = atmel_pcm_open,
 354         .close          = atmel_pcm_close,
 355         .ioctl          = snd_pcm_lib_ioctl,
 356         .hw_params      = atmel_pcm_hw_params,
 357         .hw_free        = atmel_pcm_hw_free,
 358         .prepare        = atmel_pcm_prepare,
 359         .trigger        = atmel_pcm_trigger,
 360         .pointer        = atmel_pcm_pointer,
 361         .mmap           = atmel_pcm_mmap,
 362 };
 363
 364
 365 /*--------------------------------------------------------------------------*\
 366  * ASoC platform driver
 367 \*--------------------------------------------------------------------------*/
 368 static u64 atmel_pcm_dmamask = 0xffffffff;
 369
 370 static int atmel_pcm_new(struct snd_card *card,
 371         struct snd_soc_dai *dai, struct snd_pcm *pcm)
 372 {
 373         int ret = 0;
 374
 375         if (!card->dev->dma_mask)
 376                 card->dev->dma_mask = &atmel_pcm_dmamask;
 377         if (!card->dev->coherent_dma_mask)
 378                 card->dev->coherent_dma_mask = 0xffffffff;
 379
 380         if (dai->playback.channels_min) {
 381                 ret = atmel_pcm_preallocate_dma_buffer(pcm,
 382                         SNDRV_PCM_STREAM_PLAYBACK);
 383                 if (ret)
 384                         goto out;
 385         }
 386
 387         if (dai->capture.channels_min) {
 388                 pr_debug("at32-pcm:"
 389                                 "Allocating PCM capture DMA buffer\n");
 390                 ret = atmel_pcm_preallocate_dma_buffer(pcm,
 391                         SNDRV_PCM_STREAM_CAPTURE);
 392                 if (ret)
 393                         goto out;
 394         }
 395  out:
 396         return ret;
 397 }
 398
 399 static void atmel_pcm_free_dma_buffers(struct snd_pcm *pcm)
 400 {
 401         struct snd_pcm_substream *substream;
 402         struct snd_dma_buffer *buf;
 403         int stream;
 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                 dma_free_coherent(pcm->card->dev, buf->bytes,
 414                                   buf->area, buf->addr);
 415                 buf->area = NULL;
 416         }
 417 }
 418
 419 #ifdef CONFIG_PM
 420 static int atmel_pcm_suspend(struct snd_soc_dai *dai)
 421 {
 422         struct snd_pcm_runtime *runtime = dai->runtime;
 423         struct atmel_runtime_data *prtd;
 424         struct atmel_pcm_dma_params *params;
 425
 426         if (!runtime)
 427                 return 0;
 428
 429         prtd = runtime->private_data;
 430         params = prtd->params;
 431
 432         /* disable the PDC and save the PDC registers */
 433
 434         ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);
 435
 436         prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
 437         prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
 438         prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
 439         prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);
 440
 441         return 0;
 442 }
 443
 444 static int atmel_pcm_resume(struct snd_soc_dai *dai)
 445 {
 446         struct snd_pcm_runtime *runtime = dai->runtime;
 447         struct atmel_runtime_data *prtd;
 448         struct atmel_pcm_dma_params *params;
 449
 450         if (!runtime)
 451                 return 0;
 452
 453         prtd = runtime->private_data;
 454         params = prtd->params;
 455
 456         /* restore the PDC registers and enable the PDC */
 457         ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
 458         ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
 459         ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
 460         ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);
 461
 462         ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
 463         return 0;
 464 }
 465 #else
 466 #define atmel_pcm_suspend       NULL
 467 #define atmel_pcm_resume        NULL
 468 #endif
 469
 470 struct snd_soc_platform atmel_soc_platform = {
 471         .name           = "atmel-audio",
 472         .pcm_ops        = &atmel_pcm_ops,
 473         .pcm_new        = atmel_pcm_new,
 474         .pcm_free       = atmel_pcm_free_dma_buffers,
 475         .suspend        = atmel_pcm_suspend,
 476         .resume         = atmel_pcm_resume,
 477 };
 478 EXPORT_SYMBOL_GPL(atmel_soc_platform);
 479
 480 static int __init atmel_pcm_modinit(void)
 481 {
 482         return snd_soc_register_platform(&atmel_soc_platform);
 483 }
 484 module_init(atmel_pcm_modinit);
 485
 486 static void __exit atmel_pcm_modexit(void)
 487 {
 488         snd_soc_unregister_platform(&atmel_soc_platform);
 489 }
 490 module_exit(atmel_pcm_modexit);
 491
 492 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
 493 MODULE_DESCRIPTION("Atmel PCM module");
 494 MODULE_LICENSE("GPL");