sound/arm/omap/omap-alsa.c

   1 /*
   2  * sound/arm/omap-alsa.c
   3  *
   4  * Alsa Driver for OMAP
   5  *
   6  * Copyright (C) 2005 Instituto Nokia de Tecnologia - INdT - Manaus Brazil
   7  * Written by Daniel Petrini, David Cohen, Anderson Briglia
   8  *            {daniel.petrini, david.cohen, anderson.briglia}@indt.org.br
   9  *
  10  * Copyright (C) 2006 Mika Laitio <lamikr@cc.jyu.fi>
  11  *
  12  * Based on sa11xx-uda1341.c,
  13  * Copyright (C) 2002 Tomas Kasparek <tomas.kasparek@seznam.cz>
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License as published by the
  17  * Free Software Foundation; either version 2 of the License, or (at your
  18  * option) any later version.
  19  *
  20  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  21  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  22  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  23  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  27  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  * You should have received a copy of the  GNU General Public License along
  32  * with this program; if not, write  to the Free Software Foundation, Inc.,
  33  * 675 Mass Ave, Cambridge, MA 02139, USA.
  34  *
  35  * History:
  36  *
  37  * 2005-07-29   INdT Kernel Team - Alsa driver for omap osk. Creation of new
  38  *                                 file omap-aic23.c
  39  *
  40  * 2005-12-18   Dirk Behme       - Added L/R Channel Interchange fix as proposed
  41  *                                 by Ajaya Babu
  42  *
  43  */
  44
  45 #include <linux/platform_device.h>
  46 #ifdef CONFIG_PM
  47 #include <linux/pm.h>
  48 #endif
  49 #include <sound/driver.h>
  50 #include <sound/core.h>
  51
  52 #include <asm/arch/omap-alsa.h>
  53 #include "omap-alsa-dma.h"
  54
  55 MODULE_AUTHOR("Mika Laitio, Daniel Petrini, David Cohen, Anderson Briglia - INdT");
  56 MODULE_LICENSE("GPL");
  57 MODULE_DESCRIPTION("OMAP driver for ALSA");
  58 MODULE_ALIAS("omap_alsa_mcbsp.1");
  59
  60 static char *id = NULL;
  61 static struct snd_card_omap_codec       *alsa_codec             = NULL;
  62 static struct omap_alsa_codec_config    *alsa_codec_config      = NULL;
  63
  64 /*
  65  * HW interface start and stop helper functions
  66  */
  67 static int audio_ifc_start(void)
  68 {
  69         omap_mcbsp_start(AUDIO_MCBSP);
  70         return 0;
  71 }
  72
  73 static int audio_ifc_stop(void)
  74 {
  75         omap_mcbsp_stop(AUDIO_MCBSP);
  76         return 0;
  77 }
  78
  79 static void omap_alsa_audio_init(struct snd_card_omap_codec *omap_alsa)
  80 {
  81         /* Setup DMA stuff */
  82         omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK].id = "Alsa omap out";
  83         omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK].stream_id =
  84             SNDRV_PCM_STREAM_PLAYBACK;
  85         omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK].dma_dev =
  86             OMAP_DMA_MCBSP1_TX;
  87         omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK].hw_start =
  88             audio_ifc_start;
  89         omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK].hw_stop =
  90             audio_ifc_stop;
  91
  92         omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE].id = "Alsa omap in";
  93         omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE].stream_id =
  94             SNDRV_PCM_STREAM_CAPTURE;
  95         omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE].dma_dev =
  96             OMAP_DMA_MCBSP1_RX;
  97         omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE].hw_start =
  98             audio_ifc_start;
  99         omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE].hw_stop =
 100             audio_ifc_stop;
 101 }
 102
 103 /*
 104  * DMA functions
 105  * Depends on omap-alsa-dma.c functions and (omap) dma.c
 106  *
 107  */
 108 static int audio_dma_request(struct audio_stream *s,
 109                              void (*callback) (void *))
 110 {
 111         int err;
 112         ADEBUG();
 113
 114         err = omap_request_alsa_sound_dma(s->dma_dev, s->id, s, &s->lch);
 115         if (err < 0)
 116                 printk(KERN_ERR "Unable to grab audio dma 0x%x\n", s->dma_dev);
 117         return err;
 118 }
 119
 120 static int audio_dma_free(struct audio_stream *s)
 121 {
 122         int err = 0;
 123         ADEBUG();
 124
 125         err = omap_free_alsa_sound_dma(s, &s->lch);
 126         if (err < 0)
 127                 printk(KERN_ERR "Unable to free audio dma channels!\n");
 128         return err;
 129 }
 130
 131 /*
 132  *  This function should calculate the current position of the dma in the
 133  *  buffer. It will help alsa middle layer to continue update the buffer.
 134  *  Its correctness is crucial for good functioning.
 135  */
 136 static u_int audio_get_dma_pos(struct audio_stream *s)
 137 {
 138         snd_pcm_substream_t *substream = s->stream;
 139         snd_pcm_runtime_t *runtime = substream->runtime;
 140         unsigned int offset;
 141         unsigned long flags;
 142         dma_addr_t count;
 143         ADEBUG();
 144
 145         /* this must be called w/ interrupts locked as requested in dma.c */
 146         spin_lock_irqsave(&s->dma_lock, flags);
 147
 148         /* For the current period let's see where we are */
 149         count = omap_get_dma_src_addr_counter(s->lch[s->dma_q_head]);
 150
 151         spin_unlock_irqrestore(&s->dma_lock, flags);
 152
 153         /* Now, the position related to the end of that period */
 154         offset = bytes_to_frames(runtime, s->offset) - bytes_to_frames(runtime, count);
 155
 156         if (offset >= runtime->buffer_size)
 157                 offset = 0;
 158
 159         return offset;
 160 }
 161
 162 /*
 163  * this stops the dma and clears the dma ptrs
 164  */
 165 static void audio_stop_dma(struct audio_stream *s)
 166 {
 167         unsigned long flags;
 168         ADEBUG();
 169
 170         spin_lock_irqsave(&s->dma_lock, flags);
 171         s->active = 0;
 172         s->period = 0;
 173         s->periods = 0;
 174
 175         /* this stops the dma channel and clears the buffer ptrs */
 176         omap_stop_alsa_sound_dma(s);
 177
 178         omap_clear_alsa_sound_dma(s);
 179
 180         spin_unlock_irqrestore(&s->dma_lock, flags);
 181 }
 182
 183 /*
 184  *  Main dma routine, requests dma according where you are in main alsa buffer
 185  */
 186 static void audio_process_dma(struct audio_stream *s)
 187 {
 188         snd_pcm_substream_t *substream = s->stream;
 189         snd_pcm_runtime_t *runtime;
 190         unsigned int dma_size;
 191         unsigned int offset;
 192         int ret;
 193 #ifdef CONFIG_MACH_OMAP_H6300
 194         unsigned long flags;
 195 #endif
 196
 197         ADEBUG();
 198         runtime = substream->runtime;
 199         if (s->active) {
 200                 dma_size = frames_to_bytes(runtime, runtime->period_size);
 201                 offset = dma_size * s->period;
 202                 snd_assert(dma_size <= DMA_BUF_SIZE,);
 203 #ifdef CONFIG_MACH_OMAP_H6300
 204                 spin_lock_irqsave(&s->dma_lock, flags);
 205                 omap_stop_alsa_sound_dma(s);
 206                 spin_unlock_irqrestore(&s->dma_lock, flags);
 207 #endif
 208                 ret = omap_start_alsa_sound_dma(s,
 209                                          (dma_addr_t) runtime->dma_area +
 210                                          offset, dma_size);
 211                 if (ret) {
 212                         printk(KERN_ERR
 213                                "audio_process_dma: cannot queue DMA buffer (%i)\n",
 214                                ret);
 215                         return;
 216                 }
 217
 218                 s->period++;
 219                 s->period %= runtime->periods;
 220                 s->periods++;
 221                 s->offset = offset;
 222         }
 223 }
 224
 225 /*
 226  *  This is called when dma IRQ occurs at the end of each transmited block
 227  */
 228 void callback_omap_alsa_sound_dma(void *data)
 229 {
 230         struct audio_stream *s = data;
 231
 232         ADEBUG();
 233         /*
 234          * If we are getting a callback for an active stream then we inform
 235          * the PCM middle layer we've finished a period
 236          */
 237         if (s->active)
 238                 snd_pcm_period_elapsed(s->stream);
 239
 240         spin_lock(&s->dma_lock);
 241         if (s->periods > 0)
 242                 s->periods--;
 243
 244         audio_process_dma(s);
 245         spin_unlock(&s->dma_lock);
 246 }
 247
 248 /*
 249  * Alsa section
 250  * PCM settings and callbacks
 251  */
 252 static int snd_omap_alsa_trigger(snd_pcm_substream_t * substream, int cmd)
 253 {
 254         struct snd_card_omap_codec *chip =
 255             snd_pcm_substream_chip(substream);
 256         int stream_id = substream->pstr->stream;
 257         struct audio_stream *s = &chip->s[stream_id];
 258         int err = 0;
 259
 260         ADEBUG();
 261         /* note local interrupts are already disabled in the midlevel code */
 262         spin_lock(&s->dma_lock);
 263         switch (cmd) {
 264         case SNDRV_PCM_TRIGGER_START:
 265                 /* requested stream startup */
 266                 s->active = 1;
 267                 audio_process_dma(s);
 268                 break;
 269         case SNDRV_PCM_TRIGGER_STOP:
 270                 /* requested stream shutdown */
 271                 audio_stop_dma(s);
 272                 break;
 273         default:
 274                 err = -EINVAL;
 275                 break;
 276         }
 277         spin_unlock(&s->dma_lock);
 278
 279         return err;
 280 }
 281
 282 static int snd_omap_alsa_prepare(snd_pcm_substream_t * substream)
 283 {
 284         struct snd_card_omap_codec *chip = snd_pcm_substream_chip(substream);
 285         snd_pcm_runtime_t *runtime = substream->runtime;
 286         struct audio_stream *s = &chip->s[substream->pstr->stream];
 287
 288         ADEBUG();
 289         /* set requested samplerate */
 290         alsa_codec_config->codec_set_samplerate(runtime->rate);
 291         chip->samplerate = runtime->rate;
 292
 293         s->period = 0;
 294         s->periods = 0;
 295
 296         return 0;
 297 }
 298
 299 static snd_pcm_uframes_t snd_omap_alsa_pointer(snd_pcm_substream_t *substream)
 300 {
 301         struct snd_card_omap_codec *chip = snd_pcm_substream_chip(substream);
 302
 303         ADEBUG();
 304         return audio_get_dma_pos(&chip->s[substream->pstr->stream]);
 305 }
 306
 307 static int snd_card_omap_alsa_open(snd_pcm_substream_t * substream)
 308 {
 309         struct snd_card_omap_codec *chip =
 310             snd_pcm_substream_chip(substream);
 311         snd_pcm_runtime_t *runtime = substream->runtime;
 312         int stream_id = substream->pstr->stream;
 313         int err;
 314
 315         ADEBUG();
 316         chip->s[stream_id].stream = substream;
 317         alsa_codec_config->codec_clock_on();
 318         if (stream_id == SNDRV_PCM_STREAM_PLAYBACK)
 319                 runtime->hw = *(alsa_codec_config->snd_omap_alsa_playback);
 320         else
 321                 runtime->hw = *(alsa_codec_config->snd_omap_alsa_capture);
 322
 323         if ((err = snd_pcm_hw_constraint_integer(runtime,
 324                                            SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
 325                 return err;
 326
 327         if ((err = snd_pcm_hw_constraint_list(runtime,
 328                                         0,
 329                                         SNDRV_PCM_HW_PARAM_RATE,
 330                                         alsa_codec_config->hw_constraints_rates)) < 0)
 331                 return err;
 332
 333         return 0;
 334 }
 335
 336 static int snd_card_omap_alsa_close(snd_pcm_substream_t * substream)
 337 {
 338         struct snd_card_omap_codec *chip = snd_pcm_substream_chip(substream);
 339
 340         ADEBUG();
 341         alsa_codec_config->codec_clock_off();
 342         chip->s[substream->pstr->stream].stream = NULL;
 343
 344         return 0;
 345 }
 346
 347 /* HW params & free */
 348 static int snd_omap_alsa_hw_params(snd_pcm_substream_t * substream,
 349                                     snd_pcm_hw_params_t * hw_params)
 350 {
 351         return snd_pcm_lib_malloc_pages(substream,
 352                                         params_buffer_bytes(hw_params));
 353 }
 354
 355 static int snd_omap_alsa_hw_free(snd_pcm_substream_t * substream)
 356 {
 357         return snd_pcm_lib_free_pages(substream);
 358 }
 359
 360 /* pcm operations */
 361 static snd_pcm_ops_t snd_card_omap_alsa_playback_ops = {
 362         .open =         snd_card_omap_alsa_open,
 363         .close =        snd_card_omap_alsa_close,
 364         .ioctl =        snd_pcm_lib_ioctl,
 365         .hw_params =    snd_omap_alsa_hw_params,
 366         .hw_free =      snd_omap_alsa_hw_free,
 367         .prepare =      snd_omap_alsa_prepare,
 368         .trigger =      snd_omap_alsa_trigger,
 369         .pointer =      snd_omap_alsa_pointer,
 370 };
 371
 372 static snd_pcm_ops_t snd_card_omap_alsa_capture_ops = {
 373         .open =         snd_card_omap_alsa_open,
 374         .close =        snd_card_omap_alsa_close,
 375         .ioctl =        snd_pcm_lib_ioctl,
 376         .hw_params =    snd_omap_alsa_hw_params,
 377         .hw_free =      snd_omap_alsa_hw_free,
 378         .prepare =      snd_omap_alsa_prepare,
 379         .trigger =      snd_omap_alsa_trigger,
 380         .pointer =      snd_omap_alsa_pointer,
 381 };
 382
 383 /*
 384  *  Alsa init and exit section
 385  *
 386  *  Inits pcm alsa structures, allocate the alsa buffer, suspend, resume
 387  */
 388 static int __init snd_card_omap_alsa_pcm(struct snd_card_omap_codec *omap_alsa,
 389                                         int device)
 390 {
 391         snd_pcm_t *pcm;
 392         int err;
 393
 394         ADEBUG();
 395         if ((err = snd_pcm_new(omap_alsa->card, "OMAP PCM", device, 1, 1, &pcm)) < 0)
 396                 return err;
 397
 398         /* sets up initial buffer with continuous allocation */
 399         snd_pcm_lib_preallocate_pages_for_all(pcm,
 400                                               SNDRV_DMA_TYPE_CONTINUOUS,
 401                                               snd_dma_continuous_data
 402                                               (GFP_KERNEL),
 403                                               128 * 1024, 128 * 1024);
 404
 405         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 406                         &snd_card_omap_alsa_playback_ops);
 407         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 408                         &snd_card_omap_alsa_capture_ops);
 409         pcm->private_data = omap_alsa;
 410         pcm->info_flags = 0;
 411         strcpy(pcm->name, "omap alsa pcm");
 412
 413         omap_alsa_audio_init(omap_alsa);
 414
 415         /* setup DMA controller */
 416         audio_dma_request(&omap_alsa->s[SNDRV_PCM_STREAM_PLAYBACK],
 417                           callback_omap_alsa_sound_dma);
 418         audio_dma_request(&omap_alsa->s[SNDRV_PCM_STREAM_CAPTURE],
 419                           callback_omap_alsa_sound_dma);
 420
 421         omap_alsa->pcm = pcm;
 422
 423         return 0;
 424 }
 425
 426
 427 #ifdef CONFIG_PM
 428 /*
 429  * Driver suspend/resume - calls alsa functions. Some hints from aaci.c
 430  */
 431 int snd_omap_alsa_suspend(struct platform_device *pdev, pm_message_t state)
 432 {
 433         struct snd_card_omap_codec *chip;
 434         snd_card_t *card = platform_get_drvdata(pdev);
 435
 436         if (card->power_state != SNDRV_CTL_POWER_D3hot) {
 437                 chip = card->private_data;
 438                 if (chip->card->power_state != SNDRV_CTL_POWER_D3hot) {
 439                         snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
 440                         snd_pcm_suspend_all(chip->pcm);
 441                         /* Mutes and turn clock off */
 442                         alsa_codec_config->codec_clock_off();
 443                         snd_omap_suspend_mixer();
 444                 }
 445         }
 446         return 0;
 447 }
 448
 449 int snd_omap_alsa_resume(struct platform_device *pdev)
 450 {
 451         struct snd_card_omap_codec *chip;
 452         snd_card_t *card = platform_get_drvdata(pdev);
 453
 454         if (card->power_state != SNDRV_CTL_POWER_D0) {
 455                 chip = card->private_data;
 456                 if (chip->card->power_state != SNDRV_CTL_POWER_D0) {
 457                         snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 458                         alsa_codec_config->codec_clock_on();
 459                         snd_omap_resume_mixer();
 460                 }
 461         }
 462         return 0;
 463 }
 464
 465 #endif  /* CONFIG_PM */
 466
 467 void snd_omap_alsa_free(snd_card_t * card)
 468 {
 469         struct snd_card_omap_codec *chip = card->private_data;
 470         ADEBUG();
 471
 472         /*
 473          * Turn off codec after it is done.
 474          * Can't do it immediately, since it may still have
 475          * buffered data.
 476          */
 477         schedule_timeout_interruptible(2);
 478
 479         omap_mcbsp_stop(AUDIO_MCBSP);
 480         omap_mcbsp_free(AUDIO_MCBSP);
 481
 482         audio_dma_free(&chip->s[SNDRV_PCM_STREAM_PLAYBACK]);
 483         audio_dma_free(&chip->s[SNDRV_PCM_STREAM_CAPTURE]);
 484 }
 485
 486 /* module init & exit */
 487
 488 /*
 489  * Inits alsa soudcard structure.
 490  * Called by the probe method in codec after function pointers has been set.
 491  */
 492 int snd_omap_alsa_post_probe(struct platform_device *pdev, struct omap_alsa_codec_config *config)
 493 {
 494         int err = 0;
 495         int def_rate;
 496         snd_card_t *card;
 497
 498         ADEBUG();
 499         alsa_codec_config       = config;
 500
 501         alsa_codec_config->codec_clock_setup();
 502         alsa_codec_config->codec_clock_on();
 503
 504         omap_mcbsp_request(AUDIO_MCBSP);
 505         omap_mcbsp_stop(AUDIO_MCBSP);
 506         omap_mcbsp_config(AUDIO_MCBSP, alsa_codec_config->mcbsp_regs_alsa);
 507         omap_mcbsp_start(AUDIO_MCBSP);
 508
 509         if (alsa_codec_config && alsa_codec_config->codec_configure_dev)
 510                 alsa_codec_config->codec_configure_dev();
 511
 512         alsa_codec_config->codec_clock_off();
 513
 514         /* register the soundcard */
 515         card = snd_card_new(-1, id, THIS_MODULE, sizeof(alsa_codec));
 516         if (card == NULL)
 517                 goto nodev1;
 518
 519         alsa_codec = kcalloc(1, sizeof(*alsa_codec), GFP_KERNEL);
 520         if (alsa_codec == NULL)
 521                 goto nodev2;
 522
 523         card->private_data = (void *)alsa_codec;
 524         card->private_free = snd_omap_alsa_free;
 525
 526         alsa_codec->card        = card;
 527         def_rate                = alsa_codec_config->get_default_samplerate();
 528         alsa_codec->samplerate  = def_rate;
 529
 530         spin_lock_init(&alsa_codec->s[0].dma_lock);
 531         spin_lock_init(&alsa_codec->s[1].dma_lock);
 532
 533         /* mixer */
 534         if ((err = snd_omap_mixer(alsa_codec)) < 0)
 535                 goto nodev3;
 536
 537         /* PCM */
 538         if ((err = snd_card_omap_alsa_pcm(alsa_codec, 0)) < 0)
 539                 goto nodev3;
 540
 541         strcpy(card->driver, "OMAP_ALSA");
 542         strcpy(card->shortname, alsa_codec_config->name);
 543         sprintf(card->longname, alsa_codec_config->name);
 544
 545         snd_omap_init_mixer();
 546         snd_card_set_dev(card, &pdev->dev);
 547
 548         if ((err = snd_card_register(card)) == 0) {
 549                 printk(KERN_INFO "audio support initialized\n");
 550                 platform_set_drvdata(pdev, card);
 551                 return 0;
 552         }
 553
 554 nodev3:
 555         kfree(alsa_codec);
 556 nodev2:
 557         snd_card_free(card);
 558 nodev1:
 559         omap_mcbsp_stop(AUDIO_MCBSP);
 560         omap_mcbsp_free(AUDIO_MCBSP);
 561
 562         return err;
 563 }
 564
 565 int snd_omap_alsa_remove(struct platform_device *pdev)
 566 {
 567         snd_card_t *card = platform_get_drvdata(pdev);
 568         struct snd_card_omap_codec *chip = card->private_data;
 569
 570         snd_card_free(card);
 571
 572         alsa_codec = NULL;
 573         card->private_data = NULL;
 574         kfree(chip);
 575
 576         platform_set_drvdata(pdev, NULL);
 577
 578         return 0;
 579 }